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authorAdam Harrison <adamdharrison@gmail.com>2022-11-26 16:20:59 -0500
committerAdam Harrison <adamdharrison@gmail.com>2022-11-29 18:39:46 -0500
commitfc0c4ed9a3103e0e6534311923668879fc8e0875 (patch)
tree6e7723c3f45d39f06c243d9c18a3c038da948793 /lib/mbedtls-2.27.0/library/ssl_tls.c
parent3836606e2b735ba7b2dc0f580231843660587fb4 (diff)
downloadlite-xl-plugin-manager-fc0c4ed9a3103e0e6534311923668879fc8e0875.tar.gz
lite-xl-plugin-manager-fc0c4ed9a3103e0e6534311923668879fc8e0875.zip
Removed openssl, and curl, and added mbedded tls.curl-removal
Almost fully removed curl, needs more testing. Fixed most issues, now trying to cross compile. Fix? Sigh.
Diffstat (limited to 'lib/mbedtls-2.27.0/library/ssl_tls.c')
-rw-r--r--lib/mbedtls-2.27.0/library/ssl_tls.c7650
1 files changed, 7650 insertions, 0 deletions
diff --git a/lib/mbedtls-2.27.0/library/ssl_tls.c b/lib/mbedtls-2.27.0/library/ssl_tls.c
new file mode 100644
index 0000000..976a87c
--- /dev/null
+++ b/lib/mbedtls-2.27.0/library/ssl_tls.c
@@ -0,0 +1,7650 @@
+/*
+ * SSLv3/TLSv1 shared functions
+ *
+ * Copyright The Mbed TLS Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+ * The SSL 3.0 specification was drafted by Netscape in 1996,
+ * and became an IETF standard in 1999.
+ *
+ * http://wp.netscape.com/eng/ssl3/
+ * http://www.ietf.org/rfc/rfc2246.txt
+ * http://www.ietf.org/rfc/rfc4346.txt
+ */
+
+#include "common.h"
+
+#if defined(MBEDTLS_SSL_TLS_C)
+
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdlib.h>
+#define mbedtls_calloc calloc
+#define mbedtls_free free
+#endif
+
+#include "mbedtls/ssl.h"
+#include "mbedtls/ssl_internal.h"
+#include "mbedtls/debug.h"
+#include "mbedtls/error.h"
+#include "mbedtls/platform_util.h"
+#include "mbedtls/version.h"
+
+#include <string.h>
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+#include "mbedtls/psa_util.h"
+#include "psa/crypto.h"
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+#include "mbedtls/oid.h"
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+/* Top-level Connection ID API */
+
+int mbedtls_ssl_conf_cid( mbedtls_ssl_config *conf,
+ size_t len,
+ int ignore_other_cid )
+{
+ if( len > MBEDTLS_SSL_CID_IN_LEN_MAX )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ if( ignore_other_cid != MBEDTLS_SSL_UNEXPECTED_CID_FAIL &&
+ ignore_other_cid != MBEDTLS_SSL_UNEXPECTED_CID_IGNORE )
+ {
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ conf->ignore_unexpected_cid = ignore_other_cid;
+ conf->cid_len = len;
+ return( 0 );
+}
+
+int mbedtls_ssl_set_cid( mbedtls_ssl_context *ssl,
+ int enable,
+ unsigned char const *own_cid,
+ size_t own_cid_len )
+{
+ if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ ssl->negotiate_cid = enable;
+ if( enable == MBEDTLS_SSL_CID_DISABLED )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Disable use of CID extension." ) );
+ return( 0 );
+ }
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Enable use of CID extension." ) );
+ MBEDTLS_SSL_DEBUG_BUF( 3, "Own CID", own_cid, own_cid_len );
+
+ if( own_cid_len != ssl->conf->cid_len )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "CID length %u does not match CID length %u in config",
+ (unsigned) own_cid_len,
+ (unsigned) ssl->conf->cid_len ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ memcpy( ssl->own_cid, own_cid, own_cid_len );
+ /* Truncation is not an issue here because
+ * MBEDTLS_SSL_CID_IN_LEN_MAX at most 255. */
+ ssl->own_cid_len = (uint8_t) own_cid_len;
+
+ return( 0 );
+}
+
+int mbedtls_ssl_get_peer_cid( mbedtls_ssl_context *ssl,
+ int *enabled,
+ unsigned char peer_cid[ MBEDTLS_SSL_CID_OUT_LEN_MAX ],
+ size_t *peer_cid_len )
+{
+ *enabled = MBEDTLS_SSL_CID_DISABLED;
+
+ if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ||
+ ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
+ {
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ /* We report MBEDTLS_SSL_CID_DISABLED in case the CID extensions
+ * were used, but client and server requested the empty CID.
+ * This is indistinguishable from not using the CID extension
+ * in the first place. */
+ if( ssl->transform_in->in_cid_len == 0 &&
+ ssl->transform_in->out_cid_len == 0 )
+ {
+ return( 0 );
+ }
+
+ if( peer_cid_len != NULL )
+ {
+ *peer_cid_len = ssl->transform_in->out_cid_len;
+ if( peer_cid != NULL )
+ {
+ memcpy( peer_cid, ssl->transform_in->out_cid,
+ ssl->transform_in->out_cid_len );
+ }
+ }
+
+ *enabled = MBEDTLS_SSL_CID_ENABLED;
+
+ return( 0 );
+}
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+/*
+ * Convert max_fragment_length codes to length.
+ * RFC 6066 says:
+ * enum{
+ * 2^9(1), 2^10(2), 2^11(3), 2^12(4), (255)
+ * } MaxFragmentLength;
+ * and we add 0 -> extension unused
+ */
+static unsigned int ssl_mfl_code_to_length( int mfl )
+{
+ switch( mfl )
+ {
+ case MBEDTLS_SSL_MAX_FRAG_LEN_NONE:
+ return ( MBEDTLS_TLS_EXT_ADV_CONTENT_LEN );
+ case MBEDTLS_SSL_MAX_FRAG_LEN_512:
+ return 512;
+ case MBEDTLS_SSL_MAX_FRAG_LEN_1024:
+ return 1024;
+ case MBEDTLS_SSL_MAX_FRAG_LEN_2048:
+ return 2048;
+ case MBEDTLS_SSL_MAX_FRAG_LEN_4096:
+ return 4096;
+ default:
+ return ( MBEDTLS_TLS_EXT_ADV_CONTENT_LEN );
+ }
+}
+#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
+
+int mbedtls_ssl_session_copy( mbedtls_ssl_session *dst,
+ const mbedtls_ssl_session *src )
+{
+ mbedtls_ssl_session_free( dst );
+ memcpy( dst, src, sizeof( mbedtls_ssl_session ) );
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+
+#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+ if( src->peer_cert != NULL )
+ {
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+ dst->peer_cert = mbedtls_calloc( 1, sizeof(mbedtls_x509_crt) );
+ if( dst->peer_cert == NULL )
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+
+ mbedtls_x509_crt_init( dst->peer_cert );
+
+ if( ( ret = mbedtls_x509_crt_parse_der( dst->peer_cert, src->peer_cert->raw.p,
+ src->peer_cert->raw.len ) ) != 0 )
+ {
+ mbedtls_free( dst->peer_cert );
+ dst->peer_cert = NULL;
+ return( ret );
+ }
+ }
+#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+ if( src->peer_cert_digest != NULL )
+ {
+ dst->peer_cert_digest =
+ mbedtls_calloc( 1, src->peer_cert_digest_len );
+ if( dst->peer_cert_digest == NULL )
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+
+ memcpy( dst->peer_cert_digest, src->peer_cert_digest,
+ src->peer_cert_digest_len );
+ dst->peer_cert_digest_type = src->peer_cert_digest_type;
+ dst->peer_cert_digest_len = src->peer_cert_digest_len;
+ }
+#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
+ if( src->ticket != NULL )
+ {
+ dst->ticket = mbedtls_calloc( 1, src->ticket_len );
+ if( dst->ticket == NULL )
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+
+ memcpy( dst->ticket, src->ticket, src->ticket_len );
+ }
+#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
+
+ return( 0 );
+}
+
+#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
+static int resize_buffer( unsigned char **buffer, size_t len_new, size_t *len_old )
+{
+ unsigned char* resized_buffer = mbedtls_calloc( 1, len_new );
+ if( resized_buffer == NULL )
+ return -1;
+
+ /* We want to copy len_new bytes when downsizing the buffer, and
+ * len_old bytes when upsizing, so we choose the smaller of two sizes,
+ * to fit one buffer into another. Size checks, ensuring that no data is
+ * lost, are done outside of this function. */
+ memcpy( resized_buffer, *buffer,
+ ( len_new < *len_old ) ? len_new : *len_old );
+ mbedtls_platform_zeroize( *buffer, *len_old );
+ mbedtls_free( *buffer );
+
+ *buffer = resized_buffer;
+ *len_old = len_new;
+
+ return 0;
+}
+
+static void handle_buffer_resizing( mbedtls_ssl_context *ssl, int downsizing,
+ size_t in_buf_new_len,
+ size_t out_buf_new_len )
+{
+ int modified = 0;
+ size_t written_in = 0, iv_offset_in = 0, len_offset_in = 0;
+ size_t written_out = 0, iv_offset_out = 0, len_offset_out = 0;
+ if( ssl->in_buf != NULL )
+ {
+ written_in = ssl->in_msg - ssl->in_buf;
+ iv_offset_in = ssl->in_iv - ssl->in_buf;
+ len_offset_in = ssl->in_len - ssl->in_buf;
+ if( downsizing ?
+ ssl->in_buf_len > in_buf_new_len && ssl->in_left < in_buf_new_len :
+ ssl->in_buf_len < in_buf_new_len )
+ {
+ if( resize_buffer( &ssl->in_buf, in_buf_new_len, &ssl->in_buf_len ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "input buffer resizing failed - out of memory" ) );
+ }
+ else
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Reallocating in_buf to %" MBEDTLS_PRINTF_SIZET,
+ in_buf_new_len ) );
+ modified = 1;
+ }
+ }
+ }
+
+ if( ssl->out_buf != NULL )
+ {
+ written_out = ssl->out_msg - ssl->out_buf;
+ iv_offset_out = ssl->out_iv - ssl->out_buf;
+ len_offset_out = ssl->out_len - ssl->out_buf;
+ if( downsizing ?
+ ssl->out_buf_len > out_buf_new_len && ssl->out_left < out_buf_new_len :
+ ssl->out_buf_len < out_buf_new_len )
+ {
+ if( resize_buffer( &ssl->out_buf, out_buf_new_len, &ssl->out_buf_len ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "output buffer resizing failed - out of memory" ) );
+ }
+ else
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Reallocating out_buf to %" MBEDTLS_PRINTF_SIZET,
+ out_buf_new_len ) );
+ modified = 1;
+ }
+ }
+ }
+ if( modified )
+ {
+ /* Update pointers here to avoid doing it twice. */
+ mbedtls_ssl_reset_in_out_pointers( ssl );
+ /* Fields below might not be properly updated with record
+ * splitting or with CID, so they are manually updated here. */
+ ssl->out_msg = ssl->out_buf + written_out;
+ ssl->out_len = ssl->out_buf + len_offset_out;
+ ssl->out_iv = ssl->out_buf + iv_offset_out;
+
+ ssl->in_msg = ssl->in_buf + written_in;
+ ssl->in_len = ssl->in_buf + len_offset_in;
+ ssl->in_iv = ssl->in_buf + iv_offset_in;
+ }
+}
+#endif /* MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH */
+
+/*
+ * Key material generation
+ */
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+static int ssl3_prf( const unsigned char *secret, size_t slen,
+ const char *label,
+ const unsigned char *random, size_t rlen,
+ unsigned char *dstbuf, size_t dlen )
+{
+ int ret = 0;
+ size_t i;
+ mbedtls_md5_context md5;
+ mbedtls_sha1_context sha1;
+ unsigned char padding[16];
+ unsigned char sha1sum[20];
+ ((void)label);
+
+ mbedtls_md5_init( &md5 );
+ mbedtls_sha1_init( &sha1 );
+
+ /*
+ * SSLv3:
+ * block =
+ * MD5( secret + SHA1( 'A' + secret + random ) ) +
+ * MD5( secret + SHA1( 'BB' + secret + random ) ) +
+ * MD5( secret + SHA1( 'CCC' + secret + random ) ) +
+ * ...
+ */
+ for( i = 0; i < dlen / 16; i++ )
+ {
+ memset( padding, (unsigned char) ('A' + i), 1 + i );
+
+ if( ( ret = mbedtls_sha1_starts_ret( &sha1 ) ) != 0 )
+ goto exit;
+ if( ( ret = mbedtls_sha1_update_ret( &sha1, padding, 1 + i ) ) != 0 )
+ goto exit;
+ if( ( ret = mbedtls_sha1_update_ret( &sha1, secret, slen ) ) != 0 )
+ goto exit;
+ if( ( ret = mbedtls_sha1_update_ret( &sha1, random, rlen ) ) != 0 )
+ goto exit;
+ if( ( ret = mbedtls_sha1_finish_ret( &sha1, sha1sum ) ) != 0 )
+ goto exit;
+
+ if( ( ret = mbedtls_md5_starts_ret( &md5 ) ) != 0 )
+ goto exit;
+ if( ( ret = mbedtls_md5_update_ret( &md5, secret, slen ) ) != 0 )
+ goto exit;
+ if( ( ret = mbedtls_md5_update_ret( &md5, sha1sum, 20 ) ) != 0 )
+ goto exit;
+ if( ( ret = mbedtls_md5_finish_ret( &md5, dstbuf + i * 16 ) ) != 0 )
+ goto exit;
+ }
+
+exit:
+ mbedtls_md5_free( &md5 );
+ mbedtls_sha1_free( &sha1 );
+
+ mbedtls_platform_zeroize( padding, sizeof( padding ) );
+ mbedtls_platform_zeroize( sha1sum, sizeof( sha1sum ) );
+
+ return( ret );
+}
+#endif /* MBEDTLS_SSL_PROTO_SSL3 */
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
+static int tls1_prf( const unsigned char *secret, size_t slen,
+ const char *label,
+ const unsigned char *random, size_t rlen,
+ unsigned char *dstbuf, size_t dlen )
+{
+ size_t nb, hs;
+ size_t i, j, k;
+ const unsigned char *S1, *S2;
+ unsigned char *tmp;
+ size_t tmp_len = 0;
+ unsigned char h_i[20];
+ const mbedtls_md_info_t *md_info;
+ mbedtls_md_context_t md_ctx;
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+ mbedtls_md_init( &md_ctx );
+
+ tmp_len = 20 + strlen( label ) + rlen;
+ tmp = mbedtls_calloc( 1, tmp_len );
+ if( tmp == NULL )
+ {
+ ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
+ goto exit;
+ }
+
+ hs = ( slen + 1 ) / 2;
+ S1 = secret;
+ S2 = secret + slen - hs;
+
+ nb = strlen( label );
+ memcpy( tmp + 20, label, nb );
+ memcpy( tmp + 20 + nb, random, rlen );
+ nb += rlen;
+
+ /*
+ * First compute P_md5(secret,label+random)[0..dlen]
+ */
+ if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_MD5 ) ) == NULL )
+ {
+ ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
+ goto exit;
+ }
+
+ if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
+ {
+ goto exit;
+ }
+
+ mbedtls_md_hmac_starts( &md_ctx, S1, hs );
+ mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb );
+ mbedtls_md_hmac_finish( &md_ctx, 4 + tmp );
+
+ for( i = 0; i < dlen; i += 16 )
+ {
+ mbedtls_md_hmac_reset ( &md_ctx );
+ mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 + nb );
+ mbedtls_md_hmac_finish( &md_ctx, h_i );
+
+ mbedtls_md_hmac_reset ( &md_ctx );
+ mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 );
+ mbedtls_md_hmac_finish( &md_ctx, 4 + tmp );
+
+ k = ( i + 16 > dlen ) ? dlen % 16 : 16;
+
+ for( j = 0; j < k; j++ )
+ dstbuf[i + j] = h_i[j];
+ }
+
+ mbedtls_md_free( &md_ctx );
+
+ /*
+ * XOR out with P_sha1(secret,label+random)[0..dlen]
+ */
+ if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 ) ) == NULL )
+ {
+ ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
+ goto exit;
+ }
+
+ if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
+ {
+ goto exit;
+ }
+
+ mbedtls_md_hmac_starts( &md_ctx, S2, hs );
+ mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb );
+ mbedtls_md_hmac_finish( &md_ctx, tmp );
+
+ for( i = 0; i < dlen; i += 20 )
+ {
+ mbedtls_md_hmac_reset ( &md_ctx );
+ mbedtls_md_hmac_update( &md_ctx, tmp, 20 + nb );
+ mbedtls_md_hmac_finish( &md_ctx, h_i );
+
+ mbedtls_md_hmac_reset ( &md_ctx );
+ mbedtls_md_hmac_update( &md_ctx, tmp, 20 );
+ mbedtls_md_hmac_finish( &md_ctx, tmp );
+
+ k = ( i + 20 > dlen ) ? dlen % 20 : 20;
+
+ for( j = 0; j < k; j++ )
+ dstbuf[i + j] = (unsigned char)( dstbuf[i + j] ^ h_i[j] );
+ }
+
+exit:
+ mbedtls_md_free( &md_ctx );
+
+ mbedtls_platform_zeroize( tmp, tmp_len );
+ mbedtls_platform_zeroize( h_i, sizeof( h_i ) );
+
+ mbedtls_free( tmp );
+ return( ret );
+}
+#endif /* MBEDTLS_SSL_PROTO_TLS1) || MBEDTLS_SSL_PROTO_TLS1_1 */
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+
+static psa_status_t setup_psa_key_derivation( psa_key_derivation_operation_t* derivation,
+ psa_key_id_t key,
+ psa_algorithm_t alg,
+ const unsigned char* seed, size_t seed_length,
+ const unsigned char* label, size_t label_length,
+ size_t capacity )
+{
+ psa_status_t status;
+
+ status = psa_key_derivation_setup( derivation, alg );
+ if( status != PSA_SUCCESS )
+ return( status );
+
+ if( PSA_ALG_IS_TLS12_PRF( alg ) || PSA_ALG_IS_TLS12_PSK_TO_MS( alg ) )
+ {
+ status = psa_key_derivation_input_bytes( derivation,
+ PSA_KEY_DERIVATION_INPUT_SEED,
+ seed, seed_length );
+ if( status != PSA_SUCCESS )
+ return( status );
+
+ if( mbedtls_svc_key_id_is_null( key ) )
+ {
+ status = psa_key_derivation_input_bytes(
+ derivation, PSA_KEY_DERIVATION_INPUT_SECRET,
+ NULL, 0 );
+ }
+ else
+ {
+ status = psa_key_derivation_input_key(
+ derivation, PSA_KEY_DERIVATION_INPUT_SECRET, key );
+ }
+ if( status != PSA_SUCCESS )
+ return( status );
+
+ status = psa_key_derivation_input_bytes( derivation,
+ PSA_KEY_DERIVATION_INPUT_LABEL,
+ label, label_length );
+ if( status != PSA_SUCCESS )
+ return( status );
+ }
+ else
+ {
+ return( PSA_ERROR_NOT_SUPPORTED );
+ }
+
+ status = psa_key_derivation_set_capacity( derivation, capacity );
+ if( status != PSA_SUCCESS )
+ return( status );
+
+ return( PSA_SUCCESS );
+}
+
+static int tls_prf_generic( mbedtls_md_type_t md_type,
+ const unsigned char *secret, size_t slen,
+ const char *label,
+ const unsigned char *random, size_t rlen,
+ unsigned char *dstbuf, size_t dlen )
+{
+ psa_status_t status;
+ psa_algorithm_t alg;
+ psa_key_id_t master_key = MBEDTLS_SVC_KEY_ID_INIT;
+ psa_key_derivation_operation_t derivation =
+ PSA_KEY_DERIVATION_OPERATION_INIT;
+
+ if( md_type == MBEDTLS_MD_SHA384 )
+ alg = PSA_ALG_TLS12_PRF(PSA_ALG_SHA_384);
+ else
+ alg = PSA_ALG_TLS12_PRF(PSA_ALG_SHA_256);
+
+ /* Normally a "secret" should be long enough to be impossible to
+ * find by brute force, and in particular should not be empty. But
+ * this PRF is also used to derive an IV, in particular in EAP-TLS,
+ * and for this use case it makes sense to have a 0-length "secret".
+ * Since the key API doesn't allow importing a key of length 0,
+ * keep master_key=0, which setup_psa_key_derivation() understands
+ * to mean a 0-length "secret" input. */
+ if( slen != 0 )
+ {
+ psa_key_attributes_t key_attributes = psa_key_attributes_init();
+ psa_set_key_usage_flags( &key_attributes, PSA_KEY_USAGE_DERIVE );
+ psa_set_key_algorithm( &key_attributes, alg );
+ psa_set_key_type( &key_attributes, PSA_KEY_TYPE_DERIVE );
+
+ status = psa_import_key( &key_attributes, secret, slen, &master_key );
+ if( status != PSA_SUCCESS )
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+
+ status = setup_psa_key_derivation( &derivation,
+ master_key, alg,
+ random, rlen,
+ (unsigned char const *) label,
+ (size_t) strlen( label ),
+ dlen );
+ if( status != PSA_SUCCESS )
+ {
+ psa_key_derivation_abort( &derivation );
+ psa_destroy_key( master_key );
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+
+ status = psa_key_derivation_output_bytes( &derivation, dstbuf, dlen );
+ if( status != PSA_SUCCESS )
+ {
+ psa_key_derivation_abort( &derivation );
+ psa_destroy_key( master_key );
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+
+ status = psa_key_derivation_abort( &derivation );
+ if( status != PSA_SUCCESS )
+ {
+ psa_destroy_key( master_key );
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+
+ if( ! mbedtls_svc_key_id_is_null( master_key ) )
+ status = psa_destroy_key( master_key );
+ if( status != PSA_SUCCESS )
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+
+ return( 0 );
+}
+
+#else /* MBEDTLS_USE_PSA_CRYPTO */
+
+static int tls_prf_generic( mbedtls_md_type_t md_type,
+ const unsigned char *secret, size_t slen,
+ const char *label,
+ const unsigned char *random, size_t rlen,
+ unsigned char *dstbuf, size_t dlen )
+{
+ size_t nb;
+ size_t i, j, k, md_len;
+ unsigned char *tmp;
+ size_t tmp_len = 0;
+ unsigned char h_i[MBEDTLS_MD_MAX_SIZE];
+ const mbedtls_md_info_t *md_info;
+ mbedtls_md_context_t md_ctx;
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+ mbedtls_md_init( &md_ctx );
+
+ if( ( md_info = mbedtls_md_info_from_type( md_type ) ) == NULL )
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+
+ md_len = mbedtls_md_get_size( md_info );
+
+ tmp_len = md_len + strlen( label ) + rlen;
+ tmp = mbedtls_calloc( 1, tmp_len );
+ if( tmp == NULL )
+ {
+ ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
+ goto exit;
+ }
+
+ nb = strlen( label );
+ memcpy( tmp + md_len, label, nb );
+ memcpy( tmp + md_len + nb, random, rlen );
+ nb += rlen;
+
+ /*
+ * Compute P_<hash>(secret, label + random)[0..dlen]
+ */
+ if ( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
+ goto exit;
+
+ mbedtls_md_hmac_starts( &md_ctx, secret, slen );
+ mbedtls_md_hmac_update( &md_ctx, tmp + md_len, nb );
+ mbedtls_md_hmac_finish( &md_ctx, tmp );
+
+ for( i = 0; i < dlen; i += md_len )
+ {
+ mbedtls_md_hmac_reset ( &md_ctx );
+ mbedtls_md_hmac_update( &md_ctx, tmp, md_len + nb );
+ mbedtls_md_hmac_finish( &md_ctx, h_i );
+
+ mbedtls_md_hmac_reset ( &md_ctx );
+ mbedtls_md_hmac_update( &md_ctx, tmp, md_len );
+ mbedtls_md_hmac_finish( &md_ctx, tmp );
+
+ k = ( i + md_len > dlen ) ? dlen % md_len : md_len;
+
+ for( j = 0; j < k; j++ )
+ dstbuf[i + j] = h_i[j];
+ }
+
+exit:
+ mbedtls_md_free( &md_ctx );
+
+ mbedtls_platform_zeroize( tmp, tmp_len );
+ mbedtls_platform_zeroize( h_i, sizeof( h_i ) );
+
+ mbedtls_free( tmp );
+
+ return( ret );
+}
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+#if defined(MBEDTLS_SHA256_C)
+static int tls_prf_sha256( const unsigned char *secret, size_t slen,
+ const char *label,
+ const unsigned char *random, size_t rlen,
+ unsigned char *dstbuf, size_t dlen )
+{
+ return( tls_prf_generic( MBEDTLS_MD_SHA256, secret, slen,
+ label, random, rlen, dstbuf, dlen ) );
+}
+#endif /* MBEDTLS_SHA256_C */
+
+#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
+static int tls_prf_sha384( const unsigned char *secret, size_t slen,
+ const char *label,
+ const unsigned char *random, size_t rlen,
+ unsigned char *dstbuf, size_t dlen )
+{
+ return( tls_prf_generic( MBEDTLS_MD_SHA384, secret, slen,
+ label, random, rlen, dstbuf, dlen ) );
+}
+#endif /* MBEDTLS_SHA512_C && !MBEDTLS_SHA512_NO_SHA384 */
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+
+static void ssl_update_checksum_start( mbedtls_ssl_context *, const unsigned char *, size_t );
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_1)
+static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *, const unsigned char *, size_t );
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+static void ssl_calc_verify_ssl( const mbedtls_ssl_context *, unsigned char *, size_t * );
+static void ssl_calc_finished_ssl( mbedtls_ssl_context *, unsigned char *, int );
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
+static void ssl_calc_verify_tls( const mbedtls_ssl_context *, unsigned char*, size_t * );
+static void ssl_calc_finished_tls( mbedtls_ssl_context *, unsigned char *, int );
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA256_C)
+static void ssl_update_checksum_sha256( mbedtls_ssl_context *, const unsigned char *, size_t );
+static void ssl_calc_verify_tls_sha256( const mbedtls_ssl_context *,unsigned char*, size_t * );
+static void ssl_calc_finished_tls_sha256( mbedtls_ssl_context *,unsigned char *, int );
+#endif
+
+#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
+static void ssl_update_checksum_sha384( mbedtls_ssl_context *, const unsigned char *, size_t );
+static void ssl_calc_verify_tls_sha384( const mbedtls_ssl_context *, unsigned char*, size_t * );
+static void ssl_calc_finished_tls_sha384( mbedtls_ssl_context *, unsigned char *, int );
+#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+
+#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) && \
+ defined(MBEDTLS_USE_PSA_CRYPTO)
+static int ssl_use_opaque_psk( mbedtls_ssl_context const *ssl )
+{
+ if( ssl->conf->f_psk != NULL )
+ {
+ /* If we've used a callback to select the PSK,
+ * the static configuration is irrelevant. */
+ if( ! mbedtls_svc_key_id_is_null( ssl->handshake->psk_opaque ) )
+ return( 1 );
+
+ return( 0 );
+ }
+
+ if( ! mbedtls_svc_key_id_is_null( ssl->conf->psk_opaque ) )
+ return( 1 );
+
+ return( 0 );
+}
+#endif /* MBEDTLS_USE_PSA_CRYPTO &&
+ MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */
+
+#if defined(MBEDTLS_SSL_EXPORT_KEYS)
+static mbedtls_tls_prf_types tls_prf_get_type( mbedtls_ssl_tls_prf_cb *tls_prf )
+{
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+ if( tls_prf == ssl3_prf )
+ {
+ return( MBEDTLS_SSL_TLS_PRF_SSL3 );
+ }
+ else
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
+ if( tls_prf == tls1_prf )
+ {
+ return( MBEDTLS_SSL_TLS_PRF_TLS1 );
+ }
+ else
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
+ if( tls_prf == tls_prf_sha384 )
+ {
+ return( MBEDTLS_SSL_TLS_PRF_SHA384 );
+ }
+ else
+#endif
+#if defined(MBEDTLS_SHA256_C)
+ if( tls_prf == tls_prf_sha256 )
+ {
+ return( MBEDTLS_SSL_TLS_PRF_SHA256 );
+ }
+ else
+#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+ return( MBEDTLS_SSL_TLS_PRF_NONE );
+}
+#endif /* MBEDTLS_SSL_EXPORT_KEYS */
+
+int mbedtls_ssl_tls_prf( const mbedtls_tls_prf_types prf,
+ const unsigned char *secret, size_t slen,
+ const char *label,
+ const unsigned char *random, size_t rlen,
+ unsigned char *dstbuf, size_t dlen )
+{
+ mbedtls_ssl_tls_prf_cb *tls_prf = NULL;
+
+ switch( prf )
+ {
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+ case MBEDTLS_SSL_TLS_PRF_SSL3:
+ tls_prf = ssl3_prf;
+ break;
+#endif /* MBEDTLS_SSL_PROTO_SSL3 */
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
+ case MBEDTLS_SSL_TLS_PRF_TLS1:
+ tls_prf = tls1_prf;
+ break;
+#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
+ case MBEDTLS_SSL_TLS_PRF_SHA384:
+ tls_prf = tls_prf_sha384;
+ break;
+#endif /* MBEDTLS_SHA512_C && !MBEDTLS_SHA512_NO_SHA384 */
+#if defined(MBEDTLS_SHA256_C)
+ case MBEDTLS_SSL_TLS_PRF_SHA256:
+ tls_prf = tls_prf_sha256;
+ break;
+#endif /* MBEDTLS_SHA256_C */
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+ default:
+ return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
+ }
+
+ return( tls_prf( secret, slen, label, random, rlen, dstbuf, dlen ) );
+}
+
+/* Type for the TLS PRF */
+typedef int ssl_tls_prf_t(const unsigned char *, size_t, const char *,
+ const unsigned char *, size_t,
+ unsigned char *, size_t);
+
+/*
+ * Populate a transform structure with session keys and all the other
+ * necessary information.
+ *
+ * Parameters:
+ * - [in/out]: transform: structure to populate
+ * [in] must be just initialised with mbedtls_ssl_transform_init()
+ * [out] fully populated, ready for use by mbedtls_ssl_{en,de}crypt_buf()
+ * - [in] ciphersuite
+ * - [in] master
+ * - [in] encrypt_then_mac
+ * - [in] trunc_hmac
+ * - [in] compression
+ * - [in] tls_prf: pointer to PRF to use for key derivation
+ * - [in] randbytes: buffer holding ServerHello.random + ClientHello.random
+ * - [in] minor_ver: SSL/TLS minor version
+ * - [in] endpoint: client or server
+ * - [in] ssl: optionally used for:
+ * - MBEDTLS_SSL_HW_RECORD_ACCEL: whole context (non-const)
+ * - MBEDTLS_SSL_EXPORT_KEYS: ssl->conf->{f,p}_export_keys
+ * - MBEDTLS_DEBUG_C: ssl->conf->{f,p}_dbg
+ */
+static int ssl_populate_transform( mbedtls_ssl_transform *transform,
+ int ciphersuite,
+ const unsigned char master[48],
+#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC)
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+ int encrypt_then_mac,
+#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
+#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
+ int trunc_hmac,
+#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
+#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */
+#if defined(MBEDTLS_ZLIB_SUPPORT)
+ int compression,
+#endif
+ ssl_tls_prf_t tls_prf,
+ const unsigned char randbytes[64],
+ int minor_ver,
+ unsigned endpoint,
+#if !defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
+ const
+#endif
+ mbedtls_ssl_context *ssl )
+{
+ int ret = 0;
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ int psa_fallthrough;
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+ unsigned char keyblk[256];
+ unsigned char *key1;
+ unsigned char *key2;
+ unsigned char *mac_enc;
+ unsigned char *mac_dec;
+ size_t mac_key_len = 0;
+ size_t iv_copy_len;
+ unsigned keylen;
+ const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
+ const mbedtls_cipher_info_t *cipher_info;
+ const mbedtls_md_info_t *md_info;
+
+#if !defined(MBEDTLS_SSL_HW_RECORD_ACCEL) && \
+ !defined(MBEDTLS_SSL_EXPORT_KEYS) && \
+ !defined(MBEDTLS_DEBUG_C)
+ ssl = NULL; /* make sure we don't use it except for those cases */
+ (void) ssl;
+#endif
+
+ /*
+ * Some data just needs copying into the structure
+ */
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) && \
+ defined(MBEDTLS_SSL_SOME_MODES_USE_MAC)
+ transform->encrypt_then_mac = encrypt_then_mac;
+#endif
+ transform->minor_ver = minor_ver;
+
+#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
+ memcpy( transform->randbytes, randbytes, sizeof( transform->randbytes ) );
+#endif
+
+ /*
+ * Get various info structures
+ */
+ ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( ciphersuite );
+ if( ciphersuite_info == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "ciphersuite info for %d not found",
+ ciphersuite ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ cipher_info = mbedtls_cipher_info_from_type( ciphersuite_info->cipher );
+ if( cipher_info == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "cipher info for %u not found",
+ ciphersuite_info->cipher ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ md_info = mbedtls_md_info_from_type( ciphersuite_info->mac );
+ if( md_info == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "mbedtls_md info for %u not found",
+ (unsigned) ciphersuite_info->mac ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+ /* Copy own and peer's CID if the use of the CID
+ * extension has been negotiated. */
+ if( ssl->handshake->cid_in_use == MBEDTLS_SSL_CID_ENABLED )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Copy CIDs into SSL transform" ) );
+
+ transform->in_cid_len = ssl->own_cid_len;
+ memcpy( transform->in_cid, ssl->own_cid, ssl->own_cid_len );
+ MBEDTLS_SSL_DEBUG_BUF( 3, "Incoming CID", transform->in_cid,
+ transform->in_cid_len );
+
+ transform->out_cid_len = ssl->handshake->peer_cid_len;
+ memcpy( transform->out_cid, ssl->handshake->peer_cid,
+ ssl->handshake->peer_cid_len );
+ MBEDTLS_SSL_DEBUG_BUF( 3, "Outgoing CID", transform->out_cid,
+ transform->out_cid_len );
+ }
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+
+ /*
+ * Compute key block using the PRF
+ */
+ ret = tls_prf( master, 48, "key expansion", randbytes, 64, keyblk, 256 );
+ if( ret != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
+ return( ret );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite = %s",
+ mbedtls_ssl_get_ciphersuite_name( ciphersuite ) ) );
+ MBEDTLS_SSL_DEBUG_BUF( 3, "master secret", master, 48 );
+ MBEDTLS_SSL_DEBUG_BUF( 4, "random bytes", randbytes, 64 );
+ MBEDTLS_SSL_DEBUG_BUF( 4, "key block", keyblk, 256 );
+
+ /*
+ * Determine the appropriate key, IV and MAC length.
+ */
+
+ keylen = cipher_info->key_bitlen / 8;
+
+#if defined(MBEDTLS_GCM_C) || \
+ defined(MBEDTLS_CCM_C) || \
+ defined(MBEDTLS_CHACHAPOLY_C)
+ if( cipher_info->mode == MBEDTLS_MODE_GCM ||
+ cipher_info->mode == MBEDTLS_MODE_CCM ||
+ cipher_info->mode == MBEDTLS_MODE_CHACHAPOLY )
+ {
+ size_t explicit_ivlen;
+
+ transform->maclen = 0;
+ mac_key_len = 0;
+ transform->taglen =
+ ciphersuite_info->flags & MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16;
+
+ /* All modes haves 96-bit IVs, but the length of the static parts vary
+ * with mode and version:
+ * - For GCM and CCM in TLS 1.2, there's a static IV of 4 Bytes
+ * (to be concatenated with a dynamically chosen IV of 8 Bytes)
+ * - For ChaChaPoly in TLS 1.2, and all modes in TLS 1.3, there's
+ * a static IV of 12 Bytes (to be XOR'ed with the 8 Byte record
+ * sequence number).
+ */
+ transform->ivlen = 12;
+#if defined(MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL)
+ if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_4 )
+ {
+ transform->fixed_ivlen = 12;
+ }
+ else
+#endif /* MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */
+ {
+ if( cipher_info->mode == MBEDTLS_MODE_CHACHAPOLY )
+ transform->fixed_ivlen = 12;
+ else
+ transform->fixed_ivlen = 4;
+ }
+
+ /* Minimum length of encrypted record */
+ explicit_ivlen = transform->ivlen - transform->fixed_ivlen;
+ transform->minlen = explicit_ivlen + transform->taglen;
+ }
+ else
+#endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C || MBEDTLS_CHACHAPOLY_C */
+#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC)
+ if( cipher_info->mode == MBEDTLS_MODE_STREAM ||
+ cipher_info->mode == MBEDTLS_MODE_CBC )
+ {
+ /* Initialize HMAC contexts */
+ if( ( ret = mbedtls_md_setup( &transform->md_ctx_enc, md_info, 1 ) ) != 0 ||
+ ( ret = mbedtls_md_setup( &transform->md_ctx_dec, md_info, 1 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret );
+ goto end;
+ }
+
+ /* Get MAC length */
+ mac_key_len = mbedtls_md_get_size( md_info );
+ transform->maclen = mac_key_len;
+
+#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
+ /*
+ * If HMAC is to be truncated, we shall keep the leftmost bytes,
+ * (rfc 6066 page 13 or rfc 2104 section 4),
+ * so we only need to adjust the length here.
+ */
+ if( trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED )
+ {
+ transform->maclen = MBEDTLS_SSL_TRUNCATED_HMAC_LEN;
+
+#if defined(MBEDTLS_SSL_TRUNCATED_HMAC_COMPAT)
+ /* Fall back to old, non-compliant version of the truncated
+ * HMAC implementation which also truncates the key
+ * (Mbed TLS versions from 1.3 to 2.6.0) */
+ mac_key_len = transform->maclen;
+#endif
+ }
+#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
+
+ /* IV length */
+ transform->ivlen = cipher_info->iv_size;
+
+ /* Minimum length */
+ if( cipher_info->mode == MBEDTLS_MODE_STREAM )
+ transform->minlen = transform->maclen;
+ else
+ {
+ /*
+ * GenericBlockCipher:
+ * 1. if EtM is in use: one block plus MAC
+ * otherwise: * first multiple of blocklen greater than maclen
+ * 2. IV except for SSL3 and TLS 1.0
+ */
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+ if( encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED )
+ {
+ transform->minlen = transform->maclen
+ + cipher_info->block_size;
+ }
+ else
+#endif
+ {
+ transform->minlen = transform->maclen
+ + cipher_info->block_size
+ - transform->maclen % cipher_info->block_size;
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
+ if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ||
+ minor_ver == MBEDTLS_SSL_MINOR_VERSION_1 )
+ ; /* No need to adjust minlen */
+ else
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_2 ||
+ minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
+ {
+ transform->minlen += transform->ivlen;
+ }
+ else
+#endif
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
+ goto end;
+ }
+ }
+ }
+ else
+#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "keylen: %u, minlen: %u, ivlen: %u, maclen: %u",
+ (unsigned) keylen,
+ (unsigned) transform->minlen,
+ (unsigned) transform->ivlen,
+ (unsigned) transform->maclen ) );
+
+ /*
+ * Finally setup the cipher contexts, IVs and MAC secrets.
+ */
+#if defined(MBEDTLS_SSL_CLI_C)
+ if( endpoint == MBEDTLS_SSL_IS_CLIENT )
+ {
+ key1 = keyblk + mac_key_len * 2;
+ key2 = keyblk + mac_key_len * 2 + keylen;
+
+ mac_enc = keyblk;
+ mac_dec = keyblk + mac_key_len;
+
+ /*
+ * This is not used in TLS v1.1.
+ */
+ iv_copy_len = ( transform->fixed_ivlen ) ?
+ transform->fixed_ivlen : transform->ivlen;
+ memcpy( transform->iv_enc, key2 + keylen, iv_copy_len );
+ memcpy( transform->iv_dec, key2 + keylen + iv_copy_len,
+ iv_copy_len );
+ }
+ else
+#endif /* MBEDTLS_SSL_CLI_C */
+#if defined(MBEDTLS_SSL_SRV_C)
+ if( endpoint == MBEDTLS_SSL_IS_SERVER )
+ {
+ key1 = keyblk + mac_key_len * 2 + keylen;
+ key2 = keyblk + mac_key_len * 2;
+
+ mac_enc = keyblk + mac_key_len;
+ mac_dec = keyblk;
+
+ /*
+ * This is not used in TLS v1.1.
+ */
+ iv_copy_len = ( transform->fixed_ivlen ) ?
+ transform->fixed_ivlen : transform->ivlen;
+ memcpy( transform->iv_dec, key1 + keylen, iv_copy_len );
+ memcpy( transform->iv_enc, key1 + keylen + iv_copy_len,
+ iv_copy_len );
+ }
+ else
+#endif /* MBEDTLS_SSL_SRV_C */
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
+ goto end;
+ }
+
+#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC)
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+ if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
+ {
+ if( mac_key_len > sizeof( transform->mac_enc ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
+ goto end;
+ }
+
+ memcpy( transform->mac_enc, mac_enc, mac_key_len );
+ memcpy( transform->mac_dec, mac_dec, mac_key_len );
+ }
+ else
+#endif /* MBEDTLS_SSL_PROTO_SSL3 */
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
+ {
+ /* For HMAC-based ciphersuites, initialize the HMAC transforms.
+ For AEAD-based ciphersuites, there is nothing to do here. */
+ if( mac_key_len != 0 )
+ {
+ mbedtls_md_hmac_starts( &transform->md_ctx_enc, mac_enc, mac_key_len );
+ mbedtls_md_hmac_starts( &transform->md_ctx_dec, mac_dec, mac_key_len );
+ }
+ }
+ else
+#endif
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
+ goto end;
+ }
+#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */
+
+#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
+ if( mbedtls_ssl_hw_record_init != NULL )
+ {
+ ret = 0;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_init()" ) );
+
+ if( ( ret = mbedtls_ssl_hw_record_init( ssl, key1, key2, keylen,
+ transform->iv_enc, transform->iv_dec,
+ iv_copy_len,
+ mac_enc, mac_dec,
+ mac_key_len ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_init", ret );
+ ret = MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
+ goto end;
+ }
+ }
+#else
+ ((void) mac_dec);
+ ((void) mac_enc);
+#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
+
+#if defined(MBEDTLS_SSL_EXPORT_KEYS)
+ if( ssl->conf->f_export_keys != NULL )
+ {
+ ssl->conf->f_export_keys( ssl->conf->p_export_keys,
+ master, keyblk,
+ mac_key_len, keylen,
+ iv_copy_len );
+ }
+
+ if( ssl->conf->f_export_keys_ext != NULL )
+ {
+ ssl->conf->f_export_keys_ext( ssl->conf->p_export_keys,
+ master, keyblk,
+ mac_key_len, keylen,
+ iv_copy_len,
+ randbytes + 32,
+ randbytes,
+ tls_prf_get_type( tls_prf ) );
+ }
+#endif
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+
+ /* Only use PSA-based ciphers for TLS-1.2.
+ * That's relevant at least for TLS-1.0, where
+ * we assume that mbedtls_cipher_crypt() updates
+ * the structure field for the IV, which the PSA-based
+ * implementation currently doesn't. */
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
+ {
+ ret = mbedtls_cipher_setup_psa( &transform->cipher_ctx_enc,
+ cipher_info, transform->taglen );
+ if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup_psa", ret );
+ goto end;
+ }
+
+ if( ret == 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Successfully setup PSA-based encryption cipher context" ) );
+ psa_fallthrough = 0;
+ }
+ else
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to setup PSA-based cipher context for record encryption - fall through to default setup." ) );
+ psa_fallthrough = 1;
+ }
+ }
+ else
+ psa_fallthrough = 1;
+#else
+ psa_fallthrough = 1;
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+
+ if( psa_fallthrough == 1 )
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+ if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_enc,
+ cipher_info ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret );
+ goto end;
+ }
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ /* Only use PSA-based ciphers for TLS-1.2.
+ * That's relevant at least for TLS-1.0, where
+ * we assume that mbedtls_cipher_crypt() updates
+ * the structure field for the IV, which the PSA-based
+ * implementation currently doesn't. */
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
+ {
+ ret = mbedtls_cipher_setup_psa( &transform->cipher_ctx_dec,
+ cipher_info, transform->taglen );
+ if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup_psa", ret );
+ goto end;
+ }
+
+ if( ret == 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Successfully setup PSA-based decryption cipher context" ) );
+ psa_fallthrough = 0;
+ }
+ else
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to setup PSA-based cipher context for record decryption - fall through to default setup." ) );
+ psa_fallthrough = 1;
+ }
+ }
+ else
+ psa_fallthrough = 1;
+#else
+ psa_fallthrough = 1;
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+
+ if( psa_fallthrough == 1 )
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+ if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_dec,
+ cipher_info ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret );
+ goto end;
+ }
+
+ if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_enc, key1,
+ cipher_info->key_bitlen,
+ MBEDTLS_ENCRYPT ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret );
+ goto end;
+ }
+
+ if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_dec, key2,
+ cipher_info->key_bitlen,
+ MBEDTLS_DECRYPT ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret );
+ goto end;
+ }
+
+#if defined(MBEDTLS_CIPHER_MODE_CBC)
+ if( cipher_info->mode == MBEDTLS_MODE_CBC )
+ {
+ if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_enc,
+ MBEDTLS_PADDING_NONE ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret );
+ goto end;
+ }
+
+ if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_dec,
+ MBEDTLS_PADDING_NONE ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret );
+ goto end;
+ }
+ }
+#endif /* MBEDTLS_CIPHER_MODE_CBC */
+
+
+ /* Initialize Zlib contexts */
+#if defined(MBEDTLS_ZLIB_SUPPORT)
+ if( compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Initializing zlib states" ) );
+
+ memset( &transform->ctx_deflate, 0, sizeof( transform->ctx_deflate ) );
+ memset( &transform->ctx_inflate, 0, sizeof( transform->ctx_inflate ) );
+
+ if( deflateInit( &transform->ctx_deflate,
+ Z_DEFAULT_COMPRESSION ) != Z_OK ||
+ inflateInit( &transform->ctx_inflate ) != Z_OK )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to initialize compression" ) );
+ ret = MBEDTLS_ERR_SSL_COMPRESSION_FAILED;
+ goto end;
+ }
+ }
+#endif /* MBEDTLS_ZLIB_SUPPORT */
+
+end:
+ mbedtls_platform_zeroize( keyblk, sizeof( keyblk ) );
+ return( ret );
+}
+
+/*
+ * Set appropriate PRF function and other SSL / TLS 1.0/1.1 / TLS1.2 functions
+ *
+ * Inputs:
+ * - SSL/TLS minor version
+ * - hash associated with the ciphersuite (only used by TLS 1.2)
+ *
+ * Outputs:
+ * - the tls_prf, calc_verify and calc_finished members of handshake structure
+ */
+static int ssl_set_handshake_prfs( mbedtls_ssl_handshake_params *handshake,
+ int minor_ver,
+ mbedtls_md_type_t hash )
+{
+#if !defined(MBEDTLS_SSL_PROTO_TLS1_2) || \
+ !( defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384) )
+ (void) hash;
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+ if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
+ {
+ handshake->tls_prf = ssl3_prf;
+ handshake->calc_verify = ssl_calc_verify_ssl;
+ handshake->calc_finished = ssl_calc_finished_ssl;
+ }
+ else
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
+ if( minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 )
+ {
+ handshake->tls_prf = tls1_prf;
+ handshake->calc_verify = ssl_calc_verify_tls;
+ handshake->calc_finished = ssl_calc_finished_tls;
+ }
+ else
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
+ if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 &&
+ hash == MBEDTLS_MD_SHA384 )
+ {
+ handshake->tls_prf = tls_prf_sha384;
+ handshake->calc_verify = ssl_calc_verify_tls_sha384;
+ handshake->calc_finished = ssl_calc_finished_tls_sha384;
+ }
+ else
+#endif
+#if defined(MBEDTLS_SHA256_C)
+ if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
+ {
+ handshake->tls_prf = tls_prf_sha256;
+ handshake->calc_verify = ssl_calc_verify_tls_sha256;
+ handshake->calc_finished = ssl_calc_finished_tls_sha256;
+ }
+ else
+#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+ {
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ return( 0 );
+}
+
+/*
+ * Compute master secret if needed
+ *
+ * Parameters:
+ * [in/out] handshake
+ * [in] resume, premaster, extended_ms, calc_verify, tls_prf
+ * (PSA-PSK) ciphersuite_info, psk_opaque
+ * [out] premaster (cleared)
+ * [out] master
+ * [in] ssl: optionally used for debugging, EMS and PSA-PSK
+ * debug: conf->f_dbg, conf->p_dbg
+ * EMS: passed to calc_verify (debug + (SSL3) session_negotiate)
+ * PSA-PSA: minor_ver, conf
+ */
+static int ssl_compute_master( mbedtls_ssl_handshake_params *handshake,
+ unsigned char *master,
+ const mbedtls_ssl_context *ssl )
+{
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+ /* cf. RFC 5246, Section 8.1:
+ * "The master secret is always exactly 48 bytes in length." */
+ size_t const master_secret_len = 48;
+
+#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
+ unsigned char session_hash[48];
+#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
+
+ /* The label for the KDF used for key expansion.
+ * This is either "master secret" or "extended master secret"
+ * depending on whether the Extended Master Secret extension
+ * is used. */
+ char const *lbl = "master secret";
+
+ /* The salt for the KDF used for key expansion.
+ * - If the Extended Master Secret extension is not used,
+ * this is ClientHello.Random + ServerHello.Random
+ * (see Sect. 8.1 in RFC 5246).
+ * - If the Extended Master Secret extension is used,
+ * this is the transcript of the handshake so far.
+ * (see Sect. 4 in RFC 7627). */
+ unsigned char const *salt = handshake->randbytes;
+ size_t salt_len = 64;
+
+#if !defined(MBEDTLS_DEBUG_C) && \
+ !defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) && \
+ !(defined(MBEDTLS_USE_PSA_CRYPTO) && \
+ defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED))
+ ssl = NULL; /* make sure we don't use it except for those cases */
+ (void) ssl;
+#endif
+
+ if( handshake->resume != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "no premaster (session resumed)" ) );
+ return( 0 );
+ }
+
+#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
+ if( handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED )
+ {
+ lbl = "extended master secret";
+ salt = session_hash;
+ handshake->calc_verify( ssl, session_hash, &salt_len );
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "session hash for extended master secret",
+ session_hash, salt_len );
+ }
+#endif /* MBEDTLS_SSL_EXTENDED_MS_ENABLED */
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO) && \
+ defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
+ if( handshake->ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK &&
+ ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 &&
+ ssl_use_opaque_psk( ssl ) == 1 )
+ {
+ /* Perform PSK-to-MS expansion in a single step. */
+ psa_status_t status;
+ psa_algorithm_t alg;
+ psa_key_id_t psk;
+ psa_key_derivation_operation_t derivation =
+ PSA_KEY_DERIVATION_OPERATION_INIT;
+ mbedtls_md_type_t hash_alg = handshake->ciphersuite_info->mac;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "perform PSA-based PSK-to-MS expansion" ) );
+
+ psk = mbedtls_ssl_get_opaque_psk( ssl );
+
+ if( hash_alg == MBEDTLS_MD_SHA384 )
+ alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_384);
+ else
+ alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_256);
+
+ status = setup_psa_key_derivation( &derivation, psk, alg,
+ salt, salt_len,
+ (unsigned char const *) lbl,
+ (size_t) strlen( lbl ),
+ master_secret_len );
+ if( status != PSA_SUCCESS )
+ {
+ psa_key_derivation_abort( &derivation );
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+
+ status = psa_key_derivation_output_bytes( &derivation,
+ master,
+ master_secret_len );
+ if( status != PSA_SUCCESS )
+ {
+ psa_key_derivation_abort( &derivation );
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+
+ status = psa_key_derivation_abort( &derivation );
+ if( status != PSA_SUCCESS )
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+ else
+#endif
+ {
+ ret = handshake->tls_prf( handshake->premaster, handshake->pmslen,
+ lbl, salt, salt_len,
+ master,
+ master_secret_len );
+ if( ret != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
+ return( ret );
+ }
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "premaster secret",
+ handshake->premaster,
+ handshake->pmslen );
+
+ mbedtls_platform_zeroize( handshake->premaster,
+ sizeof(handshake->premaster) );
+ }
+
+ return( 0 );
+}
+
+int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
+{
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+ const mbedtls_ssl_ciphersuite_t * const ciphersuite_info =
+ ssl->handshake->ciphersuite_info;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> derive keys" ) );
+
+ /* Set PRF, calc_verify and calc_finished function pointers */
+ ret = ssl_set_handshake_prfs( ssl->handshake,
+ ssl->minor_ver,
+ ciphersuite_info->mac );
+ if( ret != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "ssl_set_handshake_prfs", ret );
+ return( ret );
+ }
+
+ /* Compute master secret if needed */
+ ret = ssl_compute_master( ssl->handshake,
+ ssl->session_negotiate->master,
+ ssl );
+ if( ret != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "ssl_compute_master", ret );
+ return( ret );
+ }
+
+ /* Swap the client and server random values:
+ * - MS derivation wanted client+server (RFC 5246 8.1)
+ * - key derivation wants server+client (RFC 5246 6.3) */
+ {
+ unsigned char tmp[64];
+ memcpy( tmp, ssl->handshake->randbytes, 64 );
+ memcpy( ssl->handshake->randbytes, tmp + 32, 32 );
+ memcpy( ssl->handshake->randbytes + 32, tmp, 32 );
+ mbedtls_platform_zeroize( tmp, sizeof( tmp ) );
+ }
+
+ /* Populate transform structure */
+ ret = ssl_populate_transform( ssl->transform_negotiate,
+ ssl->session_negotiate->ciphersuite,
+ ssl->session_negotiate->master,
+#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC)
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+ ssl->session_negotiate->encrypt_then_mac,
+#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
+#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
+ ssl->session_negotiate->trunc_hmac,
+#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
+#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */
+#if defined(MBEDTLS_ZLIB_SUPPORT)
+ ssl->session_negotiate->compression,
+#endif
+ ssl->handshake->tls_prf,
+ ssl->handshake->randbytes,
+ ssl->minor_ver,
+ ssl->conf->endpoint,
+ ssl );
+ if( ret != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "ssl_populate_transform", ret );
+ return( ret );
+ }
+
+ /* We no longer need Server/ClientHello.random values */
+ mbedtls_platform_zeroize( ssl->handshake->randbytes,
+ sizeof( ssl->handshake->randbytes ) );
+
+ /* Allocate compression buffer */
+#if defined(MBEDTLS_ZLIB_SUPPORT)
+ if( ssl->session_negotiate->compression == MBEDTLS_SSL_COMPRESS_DEFLATE &&
+ ssl->compress_buf == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Allocating compression buffer" ) );
+ ssl->compress_buf = mbedtls_calloc( 1, MBEDTLS_SSL_COMPRESS_BUFFER_LEN );
+ if( ssl->compress_buf == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed",
+ MBEDTLS_SSL_COMPRESS_BUFFER_LEN ) );
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+ }
+ }
+#endif
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= derive keys" ) );
+
+ return( 0 );
+}
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+void ssl_calc_verify_ssl( const mbedtls_ssl_context *ssl,
+ unsigned char *hash,
+ size_t *hlen )
+{
+ mbedtls_md5_context md5;
+ mbedtls_sha1_context sha1;
+ unsigned char pad_1[48];
+ unsigned char pad_2[48];
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify ssl" ) );
+
+ mbedtls_md5_init( &md5 );
+ mbedtls_sha1_init( &sha1 );
+
+ mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
+ mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
+
+ memset( pad_1, 0x36, 48 );
+ memset( pad_2, 0x5C, 48 );
+
+ mbedtls_md5_update_ret( &md5, ssl->session_negotiate->master, 48 );
+ mbedtls_md5_update_ret( &md5, pad_1, 48 );
+ mbedtls_md5_finish_ret( &md5, hash );
+
+ mbedtls_md5_starts_ret( &md5 );
+ mbedtls_md5_update_ret( &md5, ssl->session_negotiate->master, 48 );
+ mbedtls_md5_update_ret( &md5, pad_2, 48 );
+ mbedtls_md5_update_ret( &md5, hash, 16 );
+ mbedtls_md5_finish_ret( &md5, hash );
+
+ mbedtls_sha1_update_ret( &sha1, ssl->session_negotiate->master, 48 );
+ mbedtls_sha1_update_ret( &sha1, pad_1, 40 );
+ mbedtls_sha1_finish_ret( &sha1, hash + 16 );
+
+ mbedtls_sha1_starts_ret( &sha1 );
+ mbedtls_sha1_update_ret( &sha1, ssl->session_negotiate->master, 48 );
+ mbedtls_sha1_update_ret( &sha1, pad_2, 40 );
+ mbedtls_sha1_update_ret( &sha1, hash + 16, 20 );
+ mbedtls_sha1_finish_ret( &sha1, hash + 16 );
+
+ *hlen = 36;
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, *hlen );
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
+
+ mbedtls_md5_free( &md5 );
+ mbedtls_sha1_free( &sha1 );
+
+ return;
+}
+#endif /* MBEDTLS_SSL_PROTO_SSL3 */
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
+void ssl_calc_verify_tls( const mbedtls_ssl_context *ssl,
+ unsigned char *hash,
+ size_t *hlen )
+{
+ mbedtls_md5_context md5;
+ mbedtls_sha1_context sha1;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify tls" ) );
+
+ mbedtls_md5_init( &md5 );
+ mbedtls_sha1_init( &sha1 );
+
+ mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
+ mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
+
+ mbedtls_md5_finish_ret( &md5, hash );
+ mbedtls_sha1_finish_ret( &sha1, hash + 16 );
+
+ *hlen = 36;
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, *hlen );
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
+
+ mbedtls_md5_free( &md5 );
+ mbedtls_sha1_free( &sha1 );
+
+ return;
+}
+#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA256_C)
+void ssl_calc_verify_tls_sha256( const mbedtls_ssl_context *ssl,
+ unsigned char *hash,
+ size_t *hlen )
+{
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ size_t hash_size;
+ psa_status_t status;
+ psa_hash_operation_t sha256_psa = psa_hash_operation_init();
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> PSA calc verify sha256" ) );
+ status = psa_hash_clone( &ssl->handshake->fin_sha256_psa, &sha256_psa );
+ if( status != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) );
+ return;
+ }
+
+ status = psa_hash_finish( &sha256_psa, hash, 32, &hash_size );
+ if( status != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) );
+ return;
+ }
+
+ *hlen = 32;
+ MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated verify result", hash, *hlen );
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= PSA calc verify" ) );
+#else
+ mbedtls_sha256_context sha256;
+
+ mbedtls_sha256_init( &sha256 );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha256" ) );
+
+ mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 );
+ mbedtls_sha256_finish_ret( &sha256, hash );
+
+ *hlen = 32;
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, *hlen );
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
+
+ mbedtls_sha256_free( &sha256 );
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+ return;
+}
+#endif /* MBEDTLS_SHA256_C */
+
+#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
+void ssl_calc_verify_tls_sha384( const mbedtls_ssl_context *ssl,
+ unsigned char *hash,
+ size_t *hlen )
+{
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ size_t hash_size;
+ psa_status_t status;
+ psa_hash_operation_t sha384_psa = psa_hash_operation_init();
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> PSA calc verify sha384" ) );
+ status = psa_hash_clone( &ssl->handshake->fin_sha384_psa, &sha384_psa );
+ if( status != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) );
+ return;
+ }
+
+ status = psa_hash_finish( &sha384_psa, hash, 48, &hash_size );
+ if( status != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) );
+ return;
+ }
+
+ *hlen = 48;
+ MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated verify result", hash, *hlen );
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= PSA calc verify" ) );
+#else
+ mbedtls_sha512_context sha512;
+
+ mbedtls_sha512_init( &sha512 );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha384" ) );
+
+ mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 );
+ mbedtls_sha512_finish_ret( &sha512, hash );
+
+ *hlen = 48;
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, *hlen );
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
+
+ mbedtls_sha512_free( &sha512 );
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+ return;
+}
+#endif /* MBEDTLS_SHA512_C && !MBEDTLS_SHA512_NO_SHA384 */
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
+int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exchange_type_t key_ex )
+{
+ unsigned char *p = ssl->handshake->premaster;
+ unsigned char *end = p + sizeof( ssl->handshake->premaster );
+ const unsigned char *psk = NULL;
+ size_t psk_len = 0;
+
+ if( mbedtls_ssl_get_psk( ssl, &psk, &psk_len )
+ == MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED )
+ {
+ /*
+ * This should never happen because the existence of a PSK is always
+ * checked before calling this function
+ */
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ /*
+ * PMS = struct {
+ * opaque other_secret<0..2^16-1>;
+ * opaque psk<0..2^16-1>;
+ * };
+ * with "other_secret" depending on the particular key exchange
+ */
+#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
+ if( key_ex == MBEDTLS_KEY_EXCHANGE_PSK )
+ {
+ if( end - p < 2 )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ *(p++) = (unsigned char)( psk_len >> 8 );
+ *(p++) = (unsigned char)( psk_len );
+
+ if( end < p || (size_t)( end - p ) < psk_len )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ memset( p, 0, psk_len );
+ p += psk_len;
+ }
+ else
+#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */
+#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
+ if( key_ex == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
+ {
+ /*
+ * other_secret already set by the ClientKeyExchange message,
+ * and is 48 bytes long
+ */
+ if( end - p < 2 )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ *p++ = 0;
+ *p++ = 48;
+ p += 48;
+ }
+ else
+#endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
+#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
+ if( key_ex == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
+ {
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+ size_t len;
+
+ /* Write length only when we know the actual value */
+ if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx,
+ p + 2, end - ( p + 2 ), &len,
+ ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret );
+ return( ret );
+ }
+ *(p++) = (unsigned char)( len >> 8 );
+ *(p++) = (unsigned char)( len );
+ p += len;
+
+ MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
+ }
+ else
+#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
+#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
+ if( key_ex == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
+ {
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+ size_t zlen;
+
+ if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx, &zlen,
+ p + 2, end - ( p + 2 ),
+ ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret );
+ return( ret );
+ }
+
+ *(p++) = (unsigned char)( zlen >> 8 );
+ *(p++) = (unsigned char)( zlen );
+ p += zlen;
+
+ MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx,
+ MBEDTLS_DEBUG_ECDH_Z );
+ }
+ else
+#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ /* opaque psk<0..2^16-1>; */
+ if( end - p < 2 )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ *(p++) = (unsigned char)( psk_len >> 8 );
+ *(p++) = (unsigned char)( psk_len );
+
+ if( end < p || (size_t)( end - p ) < psk_len )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ memcpy( p, psk, psk_len );
+ p += psk_len;
+
+ ssl->handshake->pmslen = p - ssl->handshake->premaster;
+
+ return( 0 );
+}
+#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
+
+#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
+static int ssl_write_hello_request( mbedtls_ssl_context *ssl );
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+int mbedtls_ssl_resend_hello_request( mbedtls_ssl_context *ssl )
+{
+ /* If renegotiation is not enforced, retransmit until we would reach max
+ * timeout if we were using the usual handshake doubling scheme */
+ if( ssl->conf->renego_max_records < 0 )
+ {
+ uint32_t ratio = ssl->conf->hs_timeout_max / ssl->conf->hs_timeout_min + 1;
+ unsigned char doublings = 1;
+
+ while( ratio != 0 )
+ {
+ ++doublings;
+ ratio >>= 1;
+ }
+
+ if( ++ssl->renego_records_seen > doublings )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "no longer retransmitting hello request" ) );
+ return( 0 );
+ }
+ }
+
+ return( ssl_write_hello_request( ssl ) );
+}
+#endif
+#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+static void ssl_clear_peer_cert( mbedtls_ssl_session *session )
+{
+#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+ if( session->peer_cert != NULL )
+ {
+ mbedtls_x509_crt_free( session->peer_cert );
+ mbedtls_free( session->peer_cert );
+ session->peer_cert = NULL;
+ }
+#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+ if( session->peer_cert_digest != NULL )
+ {
+ /* Zeroization is not necessary. */
+ mbedtls_free( session->peer_cert_digest );
+ session->peer_cert_digest = NULL;
+ session->peer_cert_digest_type = MBEDTLS_MD_NONE;
+ session->peer_cert_digest_len = 0;
+ }
+#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+}
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+/*
+ * Handshake functions
+ */
+#if !defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
+/* No certificate support -> dummy functions */
+int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl )
+{
+ const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
+ ssl->handshake->ciphersuite_info;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
+
+ if( !mbedtls_ssl_ciphersuite_uses_srv_cert( ciphersuite_info ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
+ ssl->state++;
+ return( 0 );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+}
+
+int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl )
+{
+ const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
+ ssl->handshake->ciphersuite_info;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
+
+ if( !mbedtls_ssl_ciphersuite_uses_srv_cert( ciphersuite_info ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
+ ssl->state++;
+ return( 0 );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+}
+
+#else /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
+/* Some certificate support -> implement write and parse */
+
+int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl )
+{
+ int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
+ size_t i, n;
+ const mbedtls_x509_crt *crt;
+ const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
+ ssl->handshake->ciphersuite_info;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
+
+ if( !mbedtls_ssl_ciphersuite_uses_srv_cert( ciphersuite_info ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
+ ssl->state++;
+ return( 0 );
+ }
+
+#if defined(MBEDTLS_SSL_CLI_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
+ {
+ if( ssl->client_auth == 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
+ ssl->state++;
+ return( 0 );
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+ /*
+ * If using SSLv3 and got no cert, send an Alert message
+ * (otherwise an empty Certificate message will be sent).
+ */
+ if( mbedtls_ssl_own_cert( ssl ) == NULL &&
+ ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
+ {
+ ssl->out_msglen = 2;
+ ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT;
+ ssl->out_msg[0] = MBEDTLS_SSL_ALERT_LEVEL_WARNING;
+ ssl->out_msg[1] = MBEDTLS_SSL_ALERT_MSG_NO_CERT;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "got no certificate to send" ) );
+ goto write_msg;
+ }
+#endif /* MBEDTLS_SSL_PROTO_SSL3 */
+ }
+#endif /* MBEDTLS_SSL_CLI_C */
+#if defined(MBEDTLS_SSL_SRV_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
+ {
+ if( mbedtls_ssl_own_cert( ssl ) == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no certificate to send" ) );
+ return( MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED );
+ }
+ }
+#endif
+
+ MBEDTLS_SSL_DEBUG_CRT( 3, "own certificate", mbedtls_ssl_own_cert( ssl ) );
+
+ /*
+ * 0 . 0 handshake type
+ * 1 . 3 handshake length
+ * 4 . 6 length of all certs
+ * 7 . 9 length of cert. 1
+ * 10 . n-1 peer certificate
+ * n . n+2 length of cert. 2
+ * n+3 . ... upper level cert, etc.
+ */
+ i = 7;
+ crt = mbedtls_ssl_own_cert( ssl );
+
+ while( crt != NULL )
+ {
+ n = crt->raw.len;
+ if( n > MBEDTLS_SSL_OUT_CONTENT_LEN - 3 - i )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate too large, %" MBEDTLS_PRINTF_SIZET
+ " > %" MBEDTLS_PRINTF_SIZET,
+ i + 3 + n, (size_t) MBEDTLS_SSL_OUT_CONTENT_LEN ) );
+ return( MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE );
+ }
+
+ ssl->out_msg[i ] = (unsigned char)( n >> 16 );
+ ssl->out_msg[i + 1] = (unsigned char)( n >> 8 );
+ ssl->out_msg[i + 2] = (unsigned char)( n );
+
+ i += 3; memcpy( ssl->out_msg + i, crt->raw.p, n );
+ i += n; crt = crt->next;
+ }
+
+ ssl->out_msg[4] = (unsigned char)( ( i - 7 ) >> 16 );
+ ssl->out_msg[5] = (unsigned char)( ( i - 7 ) >> 8 );
+ ssl->out_msg[6] = (unsigned char)( ( i - 7 ) );
+
+ ssl->out_msglen = i;
+ ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
+ ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE;
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_CLI_C)
+write_msg:
+#endif
+
+ ssl->state++;
+
+ if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret );
+ return( ret );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate" ) );
+
+ return( ret );
+}
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C)
+
+#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+static int ssl_check_peer_crt_unchanged( mbedtls_ssl_context *ssl,
+ unsigned char *crt_buf,
+ size_t crt_buf_len )
+{
+ mbedtls_x509_crt const * const peer_crt = ssl->session->peer_cert;
+
+ if( peer_crt == NULL )
+ return( -1 );
+
+ if( peer_crt->raw.len != crt_buf_len )
+ return( -1 );
+
+ return( memcmp( peer_crt->raw.p, crt_buf, peer_crt->raw.len ) );
+}
+#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+static int ssl_check_peer_crt_unchanged( mbedtls_ssl_context *ssl,
+ unsigned char *crt_buf,
+ size_t crt_buf_len )
+{
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+ unsigned char const * const peer_cert_digest =
+ ssl->session->peer_cert_digest;
+ mbedtls_md_type_t const peer_cert_digest_type =
+ ssl->session->peer_cert_digest_type;
+ mbedtls_md_info_t const * const digest_info =
+ mbedtls_md_info_from_type( peer_cert_digest_type );
+ unsigned char tmp_digest[MBEDTLS_SSL_PEER_CERT_DIGEST_MAX_LEN];
+ size_t digest_len;
+
+ if( peer_cert_digest == NULL || digest_info == NULL )
+ return( -1 );
+
+ digest_len = mbedtls_md_get_size( digest_info );
+ if( digest_len > MBEDTLS_SSL_PEER_CERT_DIGEST_MAX_LEN )
+ return( -1 );
+
+ ret = mbedtls_md( digest_info, crt_buf, crt_buf_len, tmp_digest );
+ if( ret != 0 )
+ return( -1 );
+
+ return( memcmp( tmp_digest, peer_cert_digest, digest_len ) );
+}
+#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+#endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */
+
+/*
+ * Once the certificate message is read, parse it into a cert chain and
+ * perform basic checks, but leave actual verification to the caller
+ */
+static int ssl_parse_certificate_chain( mbedtls_ssl_context *ssl,
+ mbedtls_x509_crt *chain )
+{
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+#if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C)
+ int crt_cnt=0;
+#endif
+ size_t i, n;
+ uint8_t alert;
+
+ if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
+ return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
+ }
+
+ if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE ||
+ ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 3 + 3 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
+ return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
+ }
+
+ i = mbedtls_ssl_hs_hdr_len( ssl );
+
+ /*
+ * Same message structure as in mbedtls_ssl_write_certificate()
+ */
+ n = ( ssl->in_msg[i+1] << 8 ) | ssl->in_msg[i+2];
+
+ if( ssl->in_msg[i] != 0 ||
+ ssl->in_hslen != n + 3 + mbedtls_ssl_hs_hdr_len( ssl ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
+ return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
+ }
+
+ /* Make &ssl->in_msg[i] point to the beginning of the CRT chain. */
+ i += 3;
+
+ /* Iterate through and parse the CRTs in the provided chain. */
+ while( i < ssl->in_hslen )
+ {
+ /* Check that there's room for the next CRT's length fields. */
+ if ( i + 3 > ssl->in_hslen ) {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
+ mbedtls_ssl_send_alert_message( ssl,
+ MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
+ return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
+ }
+ /* In theory, the CRT can be up to 2**24 Bytes, but we don't support
+ * anything beyond 2**16 ~ 64K. */
+ if( ssl->in_msg[i] != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
+ mbedtls_ssl_send_alert_message( ssl,
+ MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
+ return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
+ }
+
+ /* Read length of the next CRT in the chain. */
+ n = ( (unsigned int) ssl->in_msg[i + 1] << 8 )
+ | (unsigned int) ssl->in_msg[i + 2];
+ i += 3;
+
+ if( n < 128 || i + n > ssl->in_hslen )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
+ mbedtls_ssl_send_alert_message( ssl,
+ MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
+ return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
+ }
+
+ /* Check if we're handling the first CRT in the chain. */
+#if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C)
+ if( crt_cnt++ == 0 &&
+ ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
+ ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
+ {
+ /* During client-side renegotiation, check that the server's
+ * end-CRTs hasn't changed compared to the initial handshake,
+ * mitigating the triple handshake attack. On success, reuse
+ * the original end-CRT instead of parsing it again. */
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Check that peer CRT hasn't changed during renegotiation" ) );
+ if( ssl_check_peer_crt_unchanged( ssl,
+ &ssl->in_msg[i],
+ n ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "new server cert during renegotiation" ) );
+ mbedtls_ssl_send_alert_message( ssl,
+ MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED );
+ return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
+ }
+
+ /* Now we can safely free the original chain. */
+ ssl_clear_peer_cert( ssl->session );
+ }
+#endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */
+
+ /* Parse the next certificate in the chain. */
+#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+ ret = mbedtls_x509_crt_parse_der( chain, ssl->in_msg + i, n );
+#else
+ /* If we don't need to store the CRT chain permanently, parse
+ * it in-place from the input buffer instead of making a copy. */
+ ret = mbedtls_x509_crt_parse_der_nocopy( chain, ssl->in_msg + i, n );
+#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+ switch( ret )
+ {
+ case 0: /*ok*/
+ case MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG + MBEDTLS_ERR_OID_NOT_FOUND:
+ /* Ignore certificate with an unknown algorithm: maybe a
+ prior certificate was already trusted. */
+ break;
+
+ case MBEDTLS_ERR_X509_ALLOC_FAILED:
+ alert = MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR;
+ goto crt_parse_der_failed;
+
+ case MBEDTLS_ERR_X509_UNKNOWN_VERSION:
+ alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
+ goto crt_parse_der_failed;
+
+ default:
+ alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT;
+ crt_parse_der_failed:
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, alert );
+ MBEDTLS_SSL_DEBUG_RET( 1, " mbedtls_x509_crt_parse_der", ret );
+ return( ret );
+ }
+
+ i += n;
+ }
+
+ MBEDTLS_SSL_DEBUG_CRT( 3, "peer certificate", chain );
+ return( 0 );
+}
+
+#if defined(MBEDTLS_SSL_SRV_C)
+static int ssl_srv_check_client_no_crt_notification( mbedtls_ssl_context *ssl )
+{
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
+ return( -1 );
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+ /*
+ * Check if the client sent an empty certificate
+ */
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
+ {
+ if( ssl->in_msglen == 2 &&
+ ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT &&
+ ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
+ ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "SSLv3 client has no certificate" ) );
+ return( 0 );
+ }
+
+ return( -1 );
+ }
+#endif /* MBEDTLS_SSL_PROTO_SSL3 */
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( ssl->in_hslen == 3 + mbedtls_ssl_hs_hdr_len( ssl ) &&
+ ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
+ ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE &&
+ memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ), "\0\0\0", 3 ) == 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLSv1 client has no certificate" ) );
+ return( 0 );
+ }
+
+ return( -1 );
+#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
+ MBEDTLS_SSL_PROTO_TLS1_2 */
+}
+#endif /* MBEDTLS_SSL_SRV_C */
+
+/* Check if a certificate message is expected.
+ * Return either
+ * - SSL_CERTIFICATE_EXPECTED, or
+ * - SSL_CERTIFICATE_SKIP
+ * indicating whether a Certificate message is expected or not.
+ */
+#define SSL_CERTIFICATE_EXPECTED 0
+#define SSL_CERTIFICATE_SKIP 1
+static int ssl_parse_certificate_coordinate( mbedtls_ssl_context *ssl,
+ int authmode )
+{
+ const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
+ ssl->handshake->ciphersuite_info;
+
+ if( !mbedtls_ssl_ciphersuite_uses_srv_cert( ciphersuite_info ) )
+ return( SSL_CERTIFICATE_SKIP );
+
+#if defined(MBEDTLS_SSL_SRV_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
+ {
+ if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
+ return( SSL_CERTIFICATE_SKIP );
+
+ if( authmode == MBEDTLS_SSL_VERIFY_NONE )
+ {
+ ssl->session_negotiate->verify_result =
+ MBEDTLS_X509_BADCERT_SKIP_VERIFY;
+ return( SSL_CERTIFICATE_SKIP );
+ }
+ }
+#else
+ ((void) authmode);
+#endif /* MBEDTLS_SSL_SRV_C */
+
+ return( SSL_CERTIFICATE_EXPECTED );
+}
+
+static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl,
+ int authmode,
+ mbedtls_x509_crt *chain,
+ void *rs_ctx )
+{
+ int ret = 0;
+ const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
+ ssl->handshake->ciphersuite_info;
+ int have_ca_chain = 0;
+
+ int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *);
+ void *p_vrfy;
+
+ if( authmode == MBEDTLS_SSL_VERIFY_NONE )
+ return( 0 );
+
+ if( ssl->f_vrfy != NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Use context-specific verification callback" ) );
+ f_vrfy = ssl->f_vrfy;
+ p_vrfy = ssl->p_vrfy;
+ }
+ else
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Use configuration-specific verification callback" ) );
+ f_vrfy = ssl->conf->f_vrfy;
+ p_vrfy = ssl->conf->p_vrfy;
+ }
+
+ /*
+ * Main check: verify certificate
+ */
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+ if( ssl->conf->f_ca_cb != NULL )
+ {
+ ((void) rs_ctx);
+ have_ca_chain = 1;
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "use CA callback for X.509 CRT verification" ) );
+ ret = mbedtls_x509_crt_verify_with_ca_cb(
+ chain,
+ ssl->conf->f_ca_cb,
+ ssl->conf->p_ca_cb,
+ ssl->conf->cert_profile,
+ ssl->hostname,
+ &ssl->session_negotiate->verify_result,
+ f_vrfy, p_vrfy );
+ }
+ else
+#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
+ {
+ mbedtls_x509_crt *ca_chain;
+ mbedtls_x509_crl *ca_crl;
+
+#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
+ if( ssl->handshake->sni_ca_chain != NULL )
+ {
+ ca_chain = ssl->handshake->sni_ca_chain;
+ ca_crl = ssl->handshake->sni_ca_crl;
+ }
+ else
+#endif
+ {
+ ca_chain = ssl->conf->ca_chain;
+ ca_crl = ssl->conf->ca_crl;
+ }
+
+ if( ca_chain != NULL )
+ have_ca_chain = 1;
+
+ ret = mbedtls_x509_crt_verify_restartable(
+ chain,
+ ca_chain, ca_crl,
+ ssl->conf->cert_profile,
+ ssl->hostname,
+ &ssl->session_negotiate->verify_result,
+ f_vrfy, p_vrfy, rs_ctx );
+ }
+
+ if( ret != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "x509_verify_cert", ret );
+ }
+
+#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
+ if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
+ return( MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS );
+#endif
+
+ /*
+ * Secondary checks: always done, but change 'ret' only if it was 0
+ */
+
+#if defined(MBEDTLS_ECP_C)
+ {
+ const mbedtls_pk_context *pk = &chain->pk;
+
+ /* If certificate uses an EC key, make sure the curve is OK */
+ if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECKEY ) &&
+ mbedtls_ssl_check_curve( ssl, mbedtls_pk_ec( *pk )->grp.id ) != 0 )
+ {
+ ssl->session_negotiate->verify_result |= MBEDTLS_X509_BADCERT_BAD_KEY;
+
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (EC key curve)" ) );
+ if( ret == 0 )
+ ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
+ }
+ }
+#endif /* MBEDTLS_ECP_C */
+
+ if( mbedtls_ssl_check_cert_usage( chain,
+ ciphersuite_info,
+ ! ssl->conf->endpoint,
+ &ssl->session_negotiate->verify_result ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (usage extensions)" ) );
+ if( ret == 0 )
+ ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
+ }
+
+ /* mbedtls_x509_crt_verify_with_profile is supposed to report a
+ * verification failure through MBEDTLS_ERR_X509_CERT_VERIFY_FAILED,
+ * with details encoded in the verification flags. All other kinds
+ * of error codes, including those from the user provided f_vrfy
+ * functions, are treated as fatal and lead to a failure of
+ * ssl_parse_certificate even if verification was optional. */
+ if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL &&
+ ( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED ||
+ ret == MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ) )
+ {
+ ret = 0;
+ }
+
+ if( have_ca_chain == 0 && authmode == MBEDTLS_SSL_VERIFY_REQUIRED )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no CA chain" ) );
+ ret = MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED;
+ }
+
+ if( ret != 0 )
+ {
+ uint8_t alert;
+
+ /* The certificate may have been rejected for several reasons.
+ Pick one and send the corresponding alert. Which alert to send
+ may be a subject of debate in some cases. */
+ if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_OTHER )
+ alert = MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED;
+ else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_CN_MISMATCH )
+ alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT;
+ else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_KEY_USAGE )
+ alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
+ else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXT_KEY_USAGE )
+ alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
+ else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NS_CERT_TYPE )
+ alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
+ else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_PK )
+ alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
+ else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_KEY )
+ alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
+ else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXPIRED )
+ alert = MBEDTLS_SSL_ALERT_MSG_CERT_EXPIRED;
+ else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_REVOKED )
+ alert = MBEDTLS_SSL_ALERT_MSG_CERT_REVOKED;
+ else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NOT_TRUSTED )
+ alert = MBEDTLS_SSL_ALERT_MSG_UNKNOWN_CA;
+ else
+ alert = MBEDTLS_SSL_ALERT_MSG_CERT_UNKNOWN;
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ alert );
+ }
+
+#if defined(MBEDTLS_DEBUG_C)
+ if( ssl->session_negotiate->verify_result != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "! Certificate verification flags %08x",
+ (unsigned int) ssl->session_negotiate->verify_result ) );
+ }
+ else
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Certificate verification flags clear" ) );
+ }
+#endif /* MBEDTLS_DEBUG_C */
+
+ return( ret );
+}
+
+#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+static int ssl_remember_peer_crt_digest( mbedtls_ssl_context *ssl,
+ unsigned char *start, size_t len )
+{
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+ /* Remember digest of the peer's end-CRT. */
+ ssl->session_negotiate->peer_cert_digest =
+ mbedtls_calloc( 1, MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN );
+ if( ssl->session_negotiate->peer_cert_digest == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed",
+ MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN ) );
+ mbedtls_ssl_send_alert_message( ssl,
+ MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
+
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+ }
+
+ ret = mbedtls_md( mbedtls_md_info_from_type(
+ MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE ),
+ start, len,
+ ssl->session_negotiate->peer_cert_digest );
+
+ ssl->session_negotiate->peer_cert_digest_type =
+ MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE;
+ ssl->session_negotiate->peer_cert_digest_len =
+ MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN;
+
+ return( ret );
+}
+
+static int ssl_remember_peer_pubkey( mbedtls_ssl_context *ssl,
+ unsigned char *start, size_t len )
+{
+ unsigned char *end = start + len;
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+ /* Make a copy of the peer's raw public key. */
+ mbedtls_pk_init( &ssl->handshake->peer_pubkey );
+ ret = mbedtls_pk_parse_subpubkey( &start, end,
+ &ssl->handshake->peer_pubkey );
+ if( ret != 0 )
+ {
+ /* We should have parsed the public key before. */
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ return( 0 );
+}
+#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+
+int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl )
+{
+ int ret = 0;
+ int crt_expected;
+#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
+ const int authmode = ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET
+ ? ssl->handshake->sni_authmode
+ : ssl->conf->authmode;
+#else
+ const int authmode = ssl->conf->authmode;
+#endif
+ void *rs_ctx = NULL;
+ mbedtls_x509_crt *chain = NULL;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
+
+ crt_expected = ssl_parse_certificate_coordinate( ssl, authmode );
+ if( crt_expected == SSL_CERTIFICATE_SKIP )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
+ goto exit;
+ }
+
+#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
+ if( ssl->handshake->ecrs_enabled &&
+ ssl->handshake->ecrs_state == ssl_ecrs_crt_verify )
+ {
+ chain = ssl->handshake->ecrs_peer_cert;
+ ssl->handshake->ecrs_peer_cert = NULL;
+ goto crt_verify;
+ }
+#endif
+
+ if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 )
+ {
+ /* mbedtls_ssl_read_record may have sent an alert already. We
+ let it decide whether to alert. */
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
+ goto exit;
+ }
+
+#if defined(MBEDTLS_SSL_SRV_C)
+ if( ssl_srv_check_client_no_crt_notification( ssl ) == 0 )
+ {
+ ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING;
+
+ if( authmode != MBEDTLS_SSL_VERIFY_OPTIONAL )
+ ret = MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE;
+
+ goto exit;
+ }
+#endif /* MBEDTLS_SSL_SRV_C */
+
+ /* Clear existing peer CRT structure in case we tried to
+ * reuse a session but it failed, and allocate a new one. */
+ ssl_clear_peer_cert( ssl->session_negotiate );
+
+ chain = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) );
+ if( chain == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%" MBEDTLS_PRINTF_SIZET " bytes) failed",
+ sizeof( mbedtls_x509_crt ) ) );
+ mbedtls_ssl_send_alert_message( ssl,
+ MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
+
+ ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
+ goto exit;
+ }
+ mbedtls_x509_crt_init( chain );
+
+ ret = ssl_parse_certificate_chain( ssl, chain );
+ if( ret != 0 )
+ goto exit;
+
+#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
+ if( ssl->handshake->ecrs_enabled)
+ ssl->handshake->ecrs_state = ssl_ecrs_crt_verify;
+
+crt_verify:
+ if( ssl->handshake->ecrs_enabled)
+ rs_ctx = &ssl->handshake->ecrs_ctx;
+#endif
+
+ ret = ssl_parse_certificate_verify( ssl, authmode,
+ chain, rs_ctx );
+ if( ret != 0 )
+ goto exit;
+
+#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+ {
+ unsigned char *crt_start, *pk_start;
+ size_t crt_len, pk_len;
+
+ /* We parse the CRT chain without copying, so
+ * these pointers point into the input buffer,
+ * and are hence still valid after freeing the
+ * CRT chain. */
+
+ crt_start = chain->raw.p;
+ crt_len = chain->raw.len;
+
+ pk_start = chain->pk_raw.p;
+ pk_len = chain->pk_raw.len;
+
+ /* Free the CRT structures before computing
+ * digest and copying the peer's public key. */
+ mbedtls_x509_crt_free( chain );
+ mbedtls_free( chain );
+ chain = NULL;
+
+ ret = ssl_remember_peer_crt_digest( ssl, crt_start, crt_len );
+ if( ret != 0 )
+ goto exit;
+
+ ret = ssl_remember_peer_pubkey( ssl, pk_start, pk_len );
+ if( ret != 0 )
+ goto exit;
+ }
+#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+ /* Pass ownership to session structure. */
+ ssl->session_negotiate->peer_cert = chain;
+ chain = NULL;
+#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) );
+
+exit:
+
+ if( ret == 0 )
+ ssl->state++;
+
+#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
+ if( ret == MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
+ {
+ ssl->handshake->ecrs_peer_cert = chain;
+ chain = NULL;
+ }
+#endif
+
+ if( chain != NULL )
+ {
+ mbedtls_x509_crt_free( chain );
+ mbedtls_free( chain );
+ }
+
+ return( ret );
+}
+#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
+
+void mbedtls_ssl_optimize_checksum( mbedtls_ssl_context *ssl,
+ const mbedtls_ssl_ciphersuite_t *ciphersuite_info )
+{
+ ((void) ciphersuite_info);
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_1)
+ if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 )
+ ssl->handshake->update_checksum = ssl_update_checksum_md5sha1;
+ else
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
+ if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
+ ssl->handshake->update_checksum = ssl_update_checksum_sha384;
+ else
+#endif
+#if defined(MBEDTLS_SHA256_C)
+ if( ciphersuite_info->mac != MBEDTLS_MD_SHA384 )
+ ssl->handshake->update_checksum = ssl_update_checksum_sha256;
+ else
+#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return;
+ }
+}
+
+void mbedtls_ssl_reset_checksum( mbedtls_ssl_context *ssl )
+{
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_1)
+ mbedtls_md5_starts_ret( &ssl->handshake->fin_md5 );
+ mbedtls_sha1_starts_ret( &ssl->handshake->fin_sha1 );
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA256_C)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ psa_hash_abort( &ssl->handshake->fin_sha256_psa );
+ psa_hash_setup( &ssl->handshake->fin_sha256_psa, PSA_ALG_SHA_256 );
+#else
+ mbedtls_sha256_starts_ret( &ssl->handshake->fin_sha256, 0 );
+#endif
+#endif
+#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ psa_hash_abort( &ssl->handshake->fin_sha384_psa );
+ psa_hash_setup( &ssl->handshake->fin_sha384_psa, PSA_ALG_SHA_384 );
+#else
+ mbedtls_sha512_starts_ret( &ssl->handshake->fin_sha512, 1 );
+#endif
+#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+}
+
+static void ssl_update_checksum_start( mbedtls_ssl_context *ssl,
+ const unsigned char *buf, size_t len )
+{
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_1)
+ mbedtls_md5_update_ret( &ssl->handshake->fin_md5 , buf, len );
+ mbedtls_sha1_update_ret( &ssl->handshake->fin_sha1, buf, len );
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA256_C)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ psa_hash_update( &ssl->handshake->fin_sha256_psa, buf, len );
+#else
+ mbedtls_sha256_update_ret( &ssl->handshake->fin_sha256, buf, len );
+#endif
+#endif
+#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ psa_hash_update( &ssl->handshake->fin_sha384_psa, buf, len );
+#else
+ mbedtls_sha512_update_ret( &ssl->handshake->fin_sha512, buf, len );
+#endif
+#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+}
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_1)
+static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *ssl,
+ const unsigned char *buf, size_t len )
+{
+ mbedtls_md5_update_ret( &ssl->handshake->fin_md5 , buf, len );
+ mbedtls_sha1_update_ret( &ssl->handshake->fin_sha1, buf, len );
+}
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA256_C)
+static void ssl_update_checksum_sha256( mbedtls_ssl_context *ssl,
+ const unsigned char *buf, size_t len )
+{
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ psa_hash_update( &ssl->handshake->fin_sha256_psa, buf, len );
+#else
+ mbedtls_sha256_update_ret( &ssl->handshake->fin_sha256, buf, len );
+#endif
+}
+#endif
+
+#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
+static void ssl_update_checksum_sha384( mbedtls_ssl_context *ssl,
+ const unsigned char *buf, size_t len )
+{
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ psa_hash_update( &ssl->handshake->fin_sha384_psa, buf, len );
+#else
+ mbedtls_sha512_update_ret( &ssl->handshake->fin_sha512, buf, len );
+#endif
+}
+#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+static void ssl_calc_finished_ssl(
+ mbedtls_ssl_context *ssl, unsigned char *buf, int from )
+{
+ const char *sender;
+ mbedtls_md5_context md5;
+ mbedtls_sha1_context sha1;
+
+ unsigned char padbuf[48];
+ unsigned char md5sum[16];
+ unsigned char sha1sum[20];
+
+ mbedtls_ssl_session *session = ssl->session_negotiate;
+ if( !session )
+ session = ssl->session;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished ssl" ) );
+
+ mbedtls_md5_init( &md5 );
+ mbedtls_sha1_init( &sha1 );
+
+ mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
+ mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
+
+ /*
+ * SSLv3:
+ * hash =
+ * MD5( master + pad2 +
+ * MD5( handshake + sender + master + pad1 ) )
+ * + SHA1( master + pad2 +
+ * SHA1( handshake + sender + master + pad1 ) )
+ */
+
+#if !defined(MBEDTLS_MD5_ALT)
+ MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *)
+ md5.state, sizeof( md5.state ) );
+#endif
+
+#if !defined(MBEDTLS_SHA1_ALT)
+ MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *)
+ sha1.state, sizeof( sha1.state ) );
+#endif
+
+ sender = ( from == MBEDTLS_SSL_IS_CLIENT ) ? "CLNT"
+ : "SRVR";
+
+ memset( padbuf, 0x36, 48 );
+
+ mbedtls_md5_update_ret( &md5, (const unsigned char *) sender, 4 );
+ mbedtls_md5_update_ret( &md5, session->master, 48 );
+ mbedtls_md5_update_ret( &md5, padbuf, 48 );
+ mbedtls_md5_finish_ret( &md5, md5sum );
+
+ mbedtls_sha1_update_ret( &sha1, (const unsigned char *) sender, 4 );
+ mbedtls_sha1_update_ret( &sha1, session->master, 48 );
+ mbedtls_sha1_update_ret( &sha1, padbuf, 40 );
+ mbedtls_sha1_finish_ret( &sha1, sha1sum );
+
+ memset( padbuf, 0x5C, 48 );
+
+ mbedtls_md5_starts_ret( &md5 );
+ mbedtls_md5_update_ret( &md5, session->master, 48 );
+ mbedtls_md5_update_ret( &md5, padbuf, 48 );
+ mbedtls_md5_update_ret( &md5, md5sum, 16 );
+ mbedtls_md5_finish_ret( &md5, buf );
+
+ mbedtls_sha1_starts_ret( &sha1 );
+ mbedtls_sha1_update_ret( &sha1, session->master, 48 );
+ mbedtls_sha1_update_ret( &sha1, padbuf , 40 );
+ mbedtls_sha1_update_ret( &sha1, sha1sum, 20 );
+ mbedtls_sha1_finish_ret( &sha1, buf + 16 );
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, 36 );
+
+ mbedtls_md5_free( &md5 );
+ mbedtls_sha1_free( &sha1 );
+
+ mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) );
+ mbedtls_platform_zeroize( md5sum, sizeof( md5sum ) );
+ mbedtls_platform_zeroize( sha1sum, sizeof( sha1sum ) );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
+}
+#endif /* MBEDTLS_SSL_PROTO_SSL3 */
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
+static void ssl_calc_finished_tls(
+ mbedtls_ssl_context *ssl, unsigned char *buf, int from )
+{
+ int len = 12;
+ const char *sender;
+ mbedtls_md5_context md5;
+ mbedtls_sha1_context sha1;
+ unsigned char padbuf[36];
+
+ mbedtls_ssl_session *session = ssl->session_negotiate;
+ if( !session )
+ session = ssl->session;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls" ) );
+
+ mbedtls_md5_init( &md5 );
+ mbedtls_sha1_init( &sha1 );
+
+ mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
+ mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
+
+ /*
+ * TLSv1:
+ * hash = PRF( master, finished_label,
+ * MD5( handshake ) + SHA1( handshake ) )[0..11]
+ */
+
+#if !defined(MBEDTLS_MD5_ALT)
+ MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *)
+ md5.state, sizeof( md5.state ) );
+#endif
+
+#if !defined(MBEDTLS_SHA1_ALT)
+ MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *)
+ sha1.state, sizeof( sha1.state ) );
+#endif
+
+ sender = ( from == MBEDTLS_SSL_IS_CLIENT )
+ ? "client finished"
+ : "server finished";
+
+ mbedtls_md5_finish_ret( &md5, padbuf );
+ mbedtls_sha1_finish_ret( &sha1, padbuf + 16 );
+
+ ssl->handshake->tls_prf( session->master, 48, sender,
+ padbuf, 36, buf, len );
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
+
+ mbedtls_md5_free( &md5 );
+ mbedtls_sha1_free( &sha1 );
+
+ mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
+}
+#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA256_C)
+static void ssl_calc_finished_tls_sha256(
+ mbedtls_ssl_context *ssl, unsigned char *buf, int from )
+{
+ int len = 12;
+ const char *sender;
+ unsigned char padbuf[32];
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ size_t hash_size;
+ psa_hash_operation_t sha256_psa = PSA_HASH_OPERATION_INIT;
+ psa_status_t status;
+#else
+ mbedtls_sha256_context sha256;
+#endif
+
+ mbedtls_ssl_session *session = ssl->session_negotiate;
+ if( !session )
+ session = ssl->session;
+
+ sender = ( from == MBEDTLS_SSL_IS_CLIENT )
+ ? "client finished"
+ : "server finished";
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ sha256_psa = psa_hash_operation_init();
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc PSA finished tls sha256" ) );
+
+ status = psa_hash_clone( &ssl->handshake->fin_sha256_psa, &sha256_psa );
+ if( status != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) );
+ return;
+ }
+
+ status = psa_hash_finish( &sha256_psa, padbuf, sizeof( padbuf ), &hash_size );
+ if( status != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) );
+ return;
+ }
+ MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated padbuf", padbuf, 32 );
+#else
+
+ mbedtls_sha256_init( &sha256 );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha256" ) );
+
+ mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 );
+
+ /*
+ * TLSv1.2:
+ * hash = PRF( master, finished_label,
+ * Hash( handshake ) )[0.11]
+ */
+
+#if !defined(MBEDTLS_SHA256_ALT)
+ MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha2 state", (unsigned char *)
+ sha256.state, sizeof( sha256.state ) );
+#endif
+
+ mbedtls_sha256_finish_ret( &sha256, padbuf );
+ mbedtls_sha256_free( &sha256 );
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
+ ssl->handshake->tls_prf( session->master, 48, sender,
+ padbuf, 32, buf, len );
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
+
+ mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
+}
+#endif /* MBEDTLS_SHA256_C */
+
+#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
+
+static void ssl_calc_finished_tls_sha384(
+ mbedtls_ssl_context *ssl, unsigned char *buf, int from )
+{
+ int len = 12;
+ const char *sender;
+ unsigned char padbuf[48];
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ size_t hash_size;
+ psa_hash_operation_t sha384_psa = PSA_HASH_OPERATION_INIT;
+ psa_status_t status;
+#else
+ mbedtls_sha512_context sha512;
+#endif
+
+ mbedtls_ssl_session *session = ssl->session_negotiate;
+ if( !session )
+ session = ssl->session;
+
+ sender = ( from == MBEDTLS_SSL_IS_CLIENT )
+ ? "client finished"
+ : "server finished";
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ sha384_psa = psa_hash_operation_init();
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc PSA finished tls sha384" ) );
+
+ status = psa_hash_clone( &ssl->handshake->fin_sha384_psa, &sha384_psa );
+ if( status != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) );
+ return;
+ }
+
+ status = psa_hash_finish( &sha384_psa, padbuf, sizeof( padbuf ), &hash_size );
+ if( status != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) );
+ return;
+ }
+ MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated padbuf", padbuf, 48 );
+#else
+ mbedtls_sha512_init( &sha512 );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha384" ) );
+
+ mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 );
+
+ /*
+ * TLSv1.2:
+ * hash = PRF( master, finished_label,
+ * Hash( handshake ) )[0.11]
+ */
+
+#if !defined(MBEDTLS_SHA512_ALT)
+ MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha512 state", (unsigned char *)
+ sha512.state, sizeof( sha512.state ) );
+#endif
+ /* mbedtls_sha512_finish_ret's output parameter is declared as a
+ * 64-byte buffer, but sice we're using SHA-384, we know that the
+ * output fits in 48 bytes. This is correct C, but GCC 11.1 warns
+ * about it.
+ */
+#if defined(__GNUC__) && __GNUC__ >= 11
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstringop-overflow"
+#endif
+ mbedtls_sha512_finish_ret( &sha512, padbuf );
+#if defined(__GNUC__) && __GNUC__ >= 11
+#pragma GCC diagnostic pop
+#endif
+
+ mbedtls_sha512_free( &sha512 );
+#endif
+
+ ssl->handshake->tls_prf( session->master, 48, sender,
+ padbuf, 48, buf, len );
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
+
+ mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
+}
+#endif /* MBEDTLS_SHA512_C && !MBEDTLS_SHA512_NO_SHA384 */
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+
+void mbedtls_ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl )
+{
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup: final free" ) );
+
+ /*
+ * Free our handshake params
+ */
+ mbedtls_ssl_handshake_free( ssl );
+ mbedtls_free( ssl->handshake );
+ ssl->handshake = NULL;
+
+ /*
+ * Free the previous transform and swith in the current one
+ */
+ if( ssl->transform )
+ {
+ mbedtls_ssl_transform_free( ssl->transform );
+ mbedtls_free( ssl->transform );
+ }
+ ssl->transform = ssl->transform_negotiate;
+ ssl->transform_negotiate = NULL;
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup: final free" ) );
+}
+
+void mbedtls_ssl_handshake_wrapup( mbedtls_ssl_context *ssl )
+{
+ int resume = ssl->handshake->resume;
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup" ) );
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+ if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
+ {
+ ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_DONE;
+ ssl->renego_records_seen = 0;
+ }
+#endif
+
+ /*
+ * Free the previous session and switch in the current one
+ */
+ if( ssl->session )
+ {
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+ /* RFC 7366 3.1: keep the EtM state */
+ ssl->session_negotiate->encrypt_then_mac =
+ ssl->session->encrypt_then_mac;
+#endif
+
+ mbedtls_ssl_session_free( ssl->session );
+ mbedtls_free( ssl->session );
+ }
+ ssl->session = ssl->session_negotiate;
+ ssl->session_negotiate = NULL;
+
+ /*
+ * Add cache entry
+ */
+ if( ssl->conf->f_set_cache != NULL &&
+ ssl->session->id_len != 0 &&
+ resume == 0 )
+ {
+ if( ssl->conf->f_set_cache( ssl->conf->p_cache, ssl->session ) != 0 )
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "cache did not store session" ) );
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+ ssl->handshake->flight != NULL )
+ {
+ /* Cancel handshake timer */
+ mbedtls_ssl_set_timer( ssl, 0 );
+
+ /* Keep last flight around in case we need to resend it:
+ * we need the handshake and transform structures for that */
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip freeing handshake and transform" ) );
+ }
+ else
+#endif
+ mbedtls_ssl_handshake_wrapup_free_hs_transform( ssl );
+
+ ssl->state++;
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup" ) );
+}
+
+int mbedtls_ssl_write_finished( mbedtls_ssl_context *ssl )
+{
+ int ret, hash_len;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write finished" ) );
+
+ mbedtls_ssl_update_out_pointers( ssl, ssl->transform_negotiate );
+
+ ssl->handshake->calc_finished( ssl, ssl->out_msg + 4, ssl->conf->endpoint );
+
+ /*
+ * RFC 5246 7.4.9 (Page 63) says 12 is the default length and ciphersuites
+ * may define some other value. Currently (early 2016), no defined
+ * ciphersuite does this (and this is unlikely to change as activity has
+ * moved to TLS 1.3 now) so we can keep the hardcoded 12 here.
+ */
+ hash_len = ( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) ? 36 : 12;
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+ ssl->verify_data_len = hash_len;
+ memcpy( ssl->own_verify_data, ssl->out_msg + 4, hash_len );
+#endif
+
+ ssl->out_msglen = 4 + hash_len;
+ ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
+ ssl->out_msg[0] = MBEDTLS_SSL_HS_FINISHED;
+
+ /*
+ * In case of session resuming, invert the client and server
+ * ChangeCipherSpec messages order.
+ */
+ if( ssl->handshake->resume != 0 )
+ {
+#if defined(MBEDTLS_SSL_CLI_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
+ ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
+#endif
+#if defined(MBEDTLS_SSL_SRV_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
+ ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC;
+#endif
+ }
+ else
+ ssl->state++;
+
+ /*
+ * Switch to our negotiated transform and session parameters for outbound
+ * data.
+ */
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for outbound data" ) );
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ unsigned char i;
+
+ /* Remember current epoch settings for resending */
+ ssl->handshake->alt_transform_out = ssl->transform_out;
+ memcpy( ssl->handshake->alt_out_ctr, ssl->cur_out_ctr, 8 );
+
+ /* Set sequence_number to zero */
+ memset( ssl->cur_out_ctr + 2, 0, 6 );
+
+ /* Increment epoch */
+ for( i = 2; i > 0; i-- )
+ if( ++ssl->cur_out_ctr[i - 1] != 0 )
+ break;
+
+ /* The loop goes to its end iff the counter is wrapping */
+ if( i == 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) );
+ return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
+ }
+ }
+ else
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+ memset( ssl->cur_out_ctr, 0, 8 );
+
+ ssl->transform_out = ssl->transform_negotiate;
+ ssl->session_out = ssl->session_negotiate;
+
+#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
+ if( mbedtls_ssl_hw_record_activate != NULL )
+ {
+ if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret );
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+ }
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ mbedtls_ssl_send_flight_completed( ssl );
+#endif
+
+ if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret );
+ return( ret );
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+ ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flight_transmit", ret );
+ return( ret );
+ }
+#endif
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write finished" ) );
+
+ return( 0 );
+}
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+#define SSL_MAX_HASH_LEN 36
+#else
+#define SSL_MAX_HASH_LEN 12
+#endif
+
+int mbedtls_ssl_parse_finished( mbedtls_ssl_context *ssl )
+{
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+ unsigned int hash_len;
+ unsigned char buf[SSL_MAX_HASH_LEN];
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse finished" ) );
+
+ ssl->handshake->calc_finished( ssl, buf, ssl->conf->endpoint ^ 1 );
+
+ if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
+ return( ret );
+ }
+
+ if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
+ return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
+ }
+
+ /* There is currently no ciphersuite using another length with TLS 1.2 */
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
+ hash_len = 36;
+ else
+#endif
+ hash_len = 12;
+
+ if( ssl->in_msg[0] != MBEDTLS_SSL_HS_FINISHED ||
+ ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + hash_len )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
+ return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED );
+ }
+
+ if( mbedtls_ssl_safer_memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ),
+ buf, hash_len ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR );
+ return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED );
+ }
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+ ssl->verify_data_len = hash_len;
+ memcpy( ssl->peer_verify_data, buf, hash_len );
+#endif
+
+ if( ssl->handshake->resume != 0 )
+ {
+#if defined(MBEDTLS_SSL_CLI_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
+ ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC;
+#endif
+#if defined(MBEDTLS_SSL_SRV_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
+ ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
+#endif
+ }
+ else
+ ssl->state++;
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ mbedtls_ssl_recv_flight_completed( ssl );
+#endif
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse finished" ) );
+
+ return( 0 );
+}
+
+static void ssl_handshake_params_init( mbedtls_ssl_handshake_params *handshake )
+{
+ memset( handshake, 0, sizeof( mbedtls_ssl_handshake_params ) );
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_1)
+ mbedtls_md5_init( &handshake->fin_md5 );
+ mbedtls_sha1_init( &handshake->fin_sha1 );
+ mbedtls_md5_starts_ret( &handshake->fin_md5 );
+ mbedtls_sha1_starts_ret( &handshake->fin_sha1 );
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA256_C)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ handshake->fin_sha256_psa = psa_hash_operation_init();
+ psa_hash_setup( &handshake->fin_sha256_psa, PSA_ALG_SHA_256 );
+#else
+ mbedtls_sha256_init( &handshake->fin_sha256 );
+ mbedtls_sha256_starts_ret( &handshake->fin_sha256, 0 );
+#endif
+#endif
+#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ handshake->fin_sha384_psa = psa_hash_operation_init();
+ psa_hash_setup( &handshake->fin_sha384_psa, PSA_ALG_SHA_384 );
+#else
+ mbedtls_sha512_init( &handshake->fin_sha512 );
+ mbedtls_sha512_starts_ret( &handshake->fin_sha512, 1 );
+#endif
+#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+
+ handshake->update_checksum = ssl_update_checksum_start;
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
+ defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
+ mbedtls_ssl_sig_hash_set_init( &handshake->hash_algs );
+#endif
+
+#if defined(MBEDTLS_DHM_C)
+ mbedtls_dhm_init( &handshake->dhm_ctx );
+#endif
+#if defined(MBEDTLS_ECDH_C)
+ mbedtls_ecdh_init( &handshake->ecdh_ctx );
+#endif
+#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
+ mbedtls_ecjpake_init( &handshake->ecjpake_ctx );
+#if defined(MBEDTLS_SSL_CLI_C)
+ handshake->ecjpake_cache = NULL;
+ handshake->ecjpake_cache_len = 0;
+#endif
+#endif
+
+#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
+ mbedtls_x509_crt_restart_init( &handshake->ecrs_ctx );
+#endif
+
+#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
+ handshake->sni_authmode = MBEDTLS_SSL_VERIFY_UNSET;
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
+ !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+ mbedtls_pk_init( &handshake->peer_pubkey );
+#endif
+}
+
+void mbedtls_ssl_transform_init( mbedtls_ssl_transform *transform )
+{
+ memset( transform, 0, sizeof(mbedtls_ssl_transform) );
+
+ mbedtls_cipher_init( &transform->cipher_ctx_enc );
+ mbedtls_cipher_init( &transform->cipher_ctx_dec );
+
+#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC)
+ mbedtls_md_init( &transform->md_ctx_enc );
+ mbedtls_md_init( &transform->md_ctx_dec );
+#endif
+}
+
+void mbedtls_ssl_session_init( mbedtls_ssl_session *session )
+{
+ memset( session, 0, sizeof(mbedtls_ssl_session) );
+}
+
+static int ssl_handshake_init( mbedtls_ssl_context *ssl )
+{
+ /* Clear old handshake information if present */
+ if( ssl->transform_negotiate )
+ mbedtls_ssl_transform_free( ssl->transform_negotiate );
+ if( ssl->session_negotiate )
+ mbedtls_ssl_session_free( ssl->session_negotiate );
+ if( ssl->handshake )
+ mbedtls_ssl_handshake_free( ssl );
+
+ /*
+ * Either the pointers are now NULL or cleared properly and can be freed.
+ * Now allocate missing structures.
+ */
+ if( ssl->transform_negotiate == NULL )
+ {
+ ssl->transform_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_transform) );
+ }
+
+ if( ssl->session_negotiate == NULL )
+ {
+ ssl->session_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_session) );
+ }
+
+ if( ssl->handshake == NULL )
+ {
+ ssl->handshake = mbedtls_calloc( 1, sizeof(mbedtls_ssl_handshake_params) );
+ }
+#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
+ /* If the buffers are too small - reallocate */
+
+ handle_buffer_resizing( ssl, 0, MBEDTLS_SSL_IN_BUFFER_LEN,
+ MBEDTLS_SSL_OUT_BUFFER_LEN );
+#endif
+
+ /* All pointers should exist and can be directly freed without issue */
+ if( ssl->handshake == NULL ||
+ ssl->transform_negotiate == NULL ||
+ ssl->session_negotiate == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc() of ssl sub-contexts failed" ) );
+
+ mbedtls_free( ssl->handshake );
+ mbedtls_free( ssl->transform_negotiate );
+ mbedtls_free( ssl->session_negotiate );
+
+ ssl->handshake = NULL;
+ ssl->transform_negotiate = NULL;
+ ssl->session_negotiate = NULL;
+
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+ }
+
+ /* Initialize structures */
+ mbedtls_ssl_session_init( ssl->session_negotiate );
+ mbedtls_ssl_transform_init( ssl->transform_negotiate );
+ ssl_handshake_params_init( ssl->handshake );
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ ssl->handshake->alt_transform_out = ssl->transform_out;
+
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
+ ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING;
+ else
+ ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
+
+ mbedtls_ssl_set_timer( ssl, 0 );
+ }
+#endif
+
+ return( 0 );
+}
+
+#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
+/* Dummy cookie callbacks for defaults */
+static int ssl_cookie_write_dummy( void *ctx,
+ unsigned char **p, unsigned char *end,
+ const unsigned char *cli_id, size_t cli_id_len )
+{
+ ((void) ctx);
+ ((void) p);
+ ((void) end);
+ ((void) cli_id);
+ ((void) cli_id_len);
+
+ return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
+}
+
+static int ssl_cookie_check_dummy( void *ctx,
+ const unsigned char *cookie, size_t cookie_len,
+ const unsigned char *cli_id, size_t cli_id_len )
+{
+ ((void) ctx);
+ ((void) cookie);
+ ((void) cookie_len);
+ ((void) cli_id);
+ ((void) cli_id_len);
+
+ return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
+}
+#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY && MBEDTLS_SSL_SRV_C */
+
+/*
+ * Initialize an SSL context
+ */
+void mbedtls_ssl_init( mbedtls_ssl_context *ssl )
+{
+ memset( ssl, 0, sizeof( mbedtls_ssl_context ) );
+}
+
+/*
+ * Setup an SSL context
+ */
+
+int mbedtls_ssl_setup( mbedtls_ssl_context *ssl,
+ const mbedtls_ssl_config *conf )
+{
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+ size_t in_buf_len = MBEDTLS_SSL_IN_BUFFER_LEN;
+ size_t out_buf_len = MBEDTLS_SSL_OUT_BUFFER_LEN;
+
+ ssl->conf = conf;
+
+ /*
+ * Prepare base structures
+ */
+
+ /* Set to NULL in case of an error condition */
+ ssl->out_buf = NULL;
+
+#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
+ ssl->in_buf_len = in_buf_len;
+#endif
+ ssl->in_buf = mbedtls_calloc( 1, in_buf_len );
+ if( ssl->in_buf == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%" MBEDTLS_PRINTF_SIZET " bytes) failed", in_buf_len ) );
+ ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
+ goto error;
+ }
+
+#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
+ ssl->out_buf_len = out_buf_len;
+#endif
+ ssl->out_buf = mbedtls_calloc( 1, out_buf_len );
+ if( ssl->out_buf == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%" MBEDTLS_PRINTF_SIZET " bytes) failed", out_buf_len ) );
+ ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
+ goto error;
+ }
+
+ mbedtls_ssl_reset_in_out_pointers( ssl );
+
+#if defined(MBEDTLS_SSL_DTLS_SRTP)
+ memset( &ssl->dtls_srtp_info, 0, sizeof(ssl->dtls_srtp_info) );
+#endif
+
+ if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
+ goto error;
+
+ return( 0 );
+
+error:
+ mbedtls_free( ssl->in_buf );
+ mbedtls_free( ssl->out_buf );
+
+ ssl->conf = NULL;
+
+#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
+ ssl->in_buf_len = 0;
+ ssl->out_buf_len = 0;
+#endif
+ ssl->in_buf = NULL;
+ ssl->out_buf = NULL;
+
+ ssl->in_hdr = NULL;
+ ssl->in_ctr = NULL;
+ ssl->in_len = NULL;
+ ssl->in_iv = NULL;
+ ssl->in_msg = NULL;
+
+ ssl->out_hdr = NULL;
+ ssl->out_ctr = NULL;
+ ssl->out_len = NULL;
+ ssl->out_iv = NULL;
+ ssl->out_msg = NULL;
+
+ return( ret );
+}
+
+/*
+ * Reset an initialized and used SSL context for re-use while retaining
+ * all application-set variables, function pointers and data.
+ *
+ * If partial is non-zero, keep data in the input buffer and client ID.
+ * (Use when a DTLS client reconnects from the same port.)
+ */
+int mbedtls_ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial )
+{
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
+ size_t in_buf_len = ssl->in_buf_len;
+ size_t out_buf_len = ssl->out_buf_len;
+#else
+ size_t in_buf_len = MBEDTLS_SSL_IN_BUFFER_LEN;
+ size_t out_buf_len = MBEDTLS_SSL_OUT_BUFFER_LEN;
+#endif
+
+#if !defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) || \
+ !defined(MBEDTLS_SSL_SRV_C)
+ ((void) partial);
+#endif
+
+ ssl->state = MBEDTLS_SSL_HELLO_REQUEST;
+
+ /* Cancel any possibly running timer */
+ mbedtls_ssl_set_timer( ssl, 0 );
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+ ssl->renego_status = MBEDTLS_SSL_INITIAL_HANDSHAKE;
+ ssl->renego_records_seen = 0;
+
+ ssl->verify_data_len = 0;
+ memset( ssl->own_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN );
+ memset( ssl->peer_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN );
+#endif
+ ssl->secure_renegotiation = MBEDTLS_SSL_LEGACY_RENEGOTIATION;
+
+ ssl->in_offt = NULL;
+ mbedtls_ssl_reset_in_out_pointers( ssl );
+
+ ssl->in_msgtype = 0;
+ ssl->in_msglen = 0;
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ ssl->next_record_offset = 0;
+ ssl->in_epoch = 0;
+#endif
+#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
+ mbedtls_ssl_dtls_replay_reset( ssl );
+#endif
+
+ ssl->in_hslen = 0;
+ ssl->nb_zero = 0;
+
+ ssl->keep_current_message = 0;
+
+ ssl->out_msgtype = 0;
+ ssl->out_msglen = 0;
+ ssl->out_left = 0;
+#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
+ if( ssl->split_done != MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED )
+ ssl->split_done = 0;
+#endif
+
+ memset( ssl->cur_out_ctr, 0, sizeof( ssl->cur_out_ctr ) );
+
+ ssl->transform_in = NULL;
+ ssl->transform_out = NULL;
+
+ ssl->session_in = NULL;
+ ssl->session_out = NULL;
+
+ memset( ssl->out_buf, 0, out_buf_len );
+
+#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C)
+ if( partial == 0 )
+#endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */
+ {
+ ssl->in_left = 0;
+ memset( ssl->in_buf, 0, in_buf_len );
+ }
+
+#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
+ if( mbedtls_ssl_hw_record_reset != NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_reset()" ) );
+ if( ( ret = mbedtls_ssl_hw_record_reset( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_reset", ret );
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+ }
+#endif
+
+ if( ssl->transform )
+ {
+ mbedtls_ssl_transform_free( ssl->transform );
+ mbedtls_free( ssl->transform );
+ ssl->transform = NULL;
+ }
+
+ if( ssl->session )
+ {
+ mbedtls_ssl_session_free( ssl->session );
+ mbedtls_free( ssl->session );
+ ssl->session = NULL;
+ }
+
+#if defined(MBEDTLS_SSL_ALPN)
+ ssl->alpn_chosen = NULL;
+#endif
+
+#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
+#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE)
+ if( partial == 0 )
+#endif
+ {
+ mbedtls_free( ssl->cli_id );
+ ssl->cli_id = NULL;
+ ssl->cli_id_len = 0;
+ }
+#endif
+
+ if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
+ return( ret );
+
+ return( 0 );
+}
+
+/*
+ * Reset an initialized and used SSL context for re-use while retaining
+ * all application-set variables, function pointers and data.
+ */
+int mbedtls_ssl_session_reset( mbedtls_ssl_context *ssl )
+{
+ return( mbedtls_ssl_session_reset_int( ssl, 0 ) );
+}
+
+/*
+ * SSL set accessors
+ */
+void mbedtls_ssl_conf_endpoint( mbedtls_ssl_config *conf, int endpoint )
+{
+ conf->endpoint = endpoint;
+}
+
+void mbedtls_ssl_conf_transport( mbedtls_ssl_config *conf, int transport )
+{
+ conf->transport = transport;
+}
+
+#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
+void mbedtls_ssl_conf_dtls_anti_replay( mbedtls_ssl_config *conf, char mode )
+{
+ conf->anti_replay = mode;
+}
+#endif
+
+#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
+void mbedtls_ssl_conf_dtls_badmac_limit( mbedtls_ssl_config *conf, unsigned limit )
+{
+ conf->badmac_limit = limit;
+}
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+
+void mbedtls_ssl_set_datagram_packing( mbedtls_ssl_context *ssl,
+ unsigned allow_packing )
+{
+ ssl->disable_datagram_packing = !allow_packing;
+}
+
+void mbedtls_ssl_conf_handshake_timeout( mbedtls_ssl_config *conf,
+ uint32_t min, uint32_t max )
+{
+ conf->hs_timeout_min = min;
+ conf->hs_timeout_max = max;
+}
+#endif
+
+void mbedtls_ssl_conf_authmode( mbedtls_ssl_config *conf, int authmode )
+{
+ conf->authmode = authmode;
+}
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+void mbedtls_ssl_conf_verify( mbedtls_ssl_config *conf,
+ int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
+ void *p_vrfy )
+{
+ conf->f_vrfy = f_vrfy;
+ conf->p_vrfy = p_vrfy;
+}
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+void mbedtls_ssl_conf_rng( mbedtls_ssl_config *conf,
+ int (*f_rng)(void *, unsigned char *, size_t),
+ void *p_rng )
+{
+ conf->f_rng = f_rng;
+ conf->p_rng = p_rng;
+}
+
+void mbedtls_ssl_conf_dbg( mbedtls_ssl_config *conf,
+ void (*f_dbg)(void *, int, const char *, int, const char *),
+ void *p_dbg )
+{
+ conf->f_dbg = f_dbg;
+ conf->p_dbg = p_dbg;
+}
+
+void mbedtls_ssl_set_bio( mbedtls_ssl_context *ssl,
+ void *p_bio,
+ mbedtls_ssl_send_t *f_send,
+ mbedtls_ssl_recv_t *f_recv,
+ mbedtls_ssl_recv_timeout_t *f_recv_timeout )
+{
+ ssl->p_bio = p_bio;
+ ssl->f_send = f_send;
+ ssl->f_recv = f_recv;
+ ssl->f_recv_timeout = f_recv_timeout;
+}
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+void mbedtls_ssl_set_mtu( mbedtls_ssl_context *ssl, uint16_t mtu )
+{
+ ssl->mtu = mtu;
+}
+#endif
+
+void mbedtls_ssl_conf_read_timeout( mbedtls_ssl_config *conf, uint32_t timeout )
+{
+ conf->read_timeout = timeout;
+}
+
+void mbedtls_ssl_set_timer_cb( mbedtls_ssl_context *ssl,
+ void *p_timer,
+ mbedtls_ssl_set_timer_t *f_set_timer,
+ mbedtls_ssl_get_timer_t *f_get_timer )
+{
+ ssl->p_timer = p_timer;
+ ssl->f_set_timer = f_set_timer;
+ ssl->f_get_timer = f_get_timer;
+
+ /* Make sure we start with no timer running */
+ mbedtls_ssl_set_timer( ssl, 0 );
+}
+
+#if defined(MBEDTLS_SSL_SRV_C)
+void mbedtls_ssl_conf_session_cache( mbedtls_ssl_config *conf,
+ void *p_cache,
+ int (*f_get_cache)(void *, mbedtls_ssl_session *),
+ int (*f_set_cache)(void *, const mbedtls_ssl_session *) )
+{
+ conf->p_cache = p_cache;
+ conf->f_get_cache = f_get_cache;
+ conf->f_set_cache = f_set_cache;
+}
+#endif /* MBEDTLS_SSL_SRV_C */
+
+#if defined(MBEDTLS_SSL_CLI_C)
+int mbedtls_ssl_set_session( mbedtls_ssl_context *ssl, const mbedtls_ssl_session *session )
+{
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+ if( ssl == NULL ||
+ session == NULL ||
+ ssl->session_negotiate == NULL ||
+ ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT )
+ {
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ if( ( ret = mbedtls_ssl_session_copy( ssl->session_negotiate,
+ session ) ) != 0 )
+ return( ret );
+
+ ssl->handshake->resume = 1;
+
+ return( 0 );
+}
+#endif /* MBEDTLS_SSL_CLI_C */
+
+void mbedtls_ssl_conf_ciphersuites( mbedtls_ssl_config *conf,
+ const int *ciphersuites )
+{
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = ciphersuites;
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = ciphersuites;
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = ciphersuites;
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = ciphersuites;
+}
+
+void mbedtls_ssl_conf_ciphersuites_for_version( mbedtls_ssl_config *conf,
+ const int *ciphersuites,
+ int major, int minor )
+{
+ if( major != MBEDTLS_SSL_MAJOR_VERSION_3 )
+ return;
+
+ if( minor < MBEDTLS_SSL_MINOR_VERSION_0 || minor > MBEDTLS_SSL_MINOR_VERSION_3 )
+ return;
+
+ conf->ciphersuite_list[minor] = ciphersuites;
+}
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+void mbedtls_ssl_conf_cert_profile( mbedtls_ssl_config *conf,
+ const mbedtls_x509_crt_profile *profile )
+{
+ conf->cert_profile = profile;
+}
+
+/* Append a new keycert entry to a (possibly empty) list */
+static int ssl_append_key_cert( mbedtls_ssl_key_cert **head,
+ mbedtls_x509_crt *cert,
+ mbedtls_pk_context *key )
+{
+ mbedtls_ssl_key_cert *new_cert;
+
+ new_cert = mbedtls_calloc( 1, sizeof( mbedtls_ssl_key_cert ) );
+ if( new_cert == NULL )
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+
+ new_cert->cert = cert;
+ new_cert->key = key;
+ new_cert->next = NULL;
+
+ /* Update head is the list was null, else add to the end */
+ if( *head == NULL )
+ {
+ *head = new_cert;
+ }
+ else
+ {
+ mbedtls_ssl_key_cert *cur = *head;
+ while( cur->next != NULL )
+ cur = cur->next;
+ cur->next = new_cert;
+ }
+
+ return( 0 );
+}
+
+int mbedtls_ssl_conf_own_cert( mbedtls_ssl_config *conf,
+ mbedtls_x509_crt *own_cert,
+ mbedtls_pk_context *pk_key )
+{
+ return( ssl_append_key_cert( &conf->key_cert, own_cert, pk_key ) );
+}
+
+void mbedtls_ssl_conf_ca_chain( mbedtls_ssl_config *conf,
+ mbedtls_x509_crt *ca_chain,
+ mbedtls_x509_crl *ca_crl )
+{
+ conf->ca_chain = ca_chain;
+ conf->ca_crl = ca_crl;
+
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+ /* mbedtls_ssl_conf_ca_chain() and mbedtls_ssl_conf_ca_cb()
+ * cannot be used together. */
+ conf->f_ca_cb = NULL;
+ conf->p_ca_cb = NULL;
+#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
+}
+
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+void mbedtls_ssl_conf_ca_cb( mbedtls_ssl_config *conf,
+ mbedtls_x509_crt_ca_cb_t f_ca_cb,
+ void *p_ca_cb )
+{
+ conf->f_ca_cb = f_ca_cb;
+ conf->p_ca_cb = p_ca_cb;
+
+ /* mbedtls_ssl_conf_ca_chain() and mbedtls_ssl_conf_ca_cb()
+ * cannot be used together. */
+ conf->ca_chain = NULL;
+ conf->ca_crl = NULL;
+}
+#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
+int mbedtls_ssl_set_hs_own_cert( mbedtls_ssl_context *ssl,
+ mbedtls_x509_crt *own_cert,
+ mbedtls_pk_context *pk_key )
+{
+ return( ssl_append_key_cert( &ssl->handshake->sni_key_cert,
+ own_cert, pk_key ) );
+}
+
+void mbedtls_ssl_set_hs_ca_chain( mbedtls_ssl_context *ssl,
+ mbedtls_x509_crt *ca_chain,
+ mbedtls_x509_crl *ca_crl )
+{
+ ssl->handshake->sni_ca_chain = ca_chain;
+ ssl->handshake->sni_ca_crl = ca_crl;
+}
+
+void mbedtls_ssl_set_hs_authmode( mbedtls_ssl_context *ssl,
+ int authmode )
+{
+ ssl->handshake->sni_authmode = authmode;
+}
+#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+void mbedtls_ssl_set_verify( mbedtls_ssl_context *ssl,
+ int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
+ void *p_vrfy )
+{
+ ssl->f_vrfy = f_vrfy;
+ ssl->p_vrfy = p_vrfy;
+}
+#endif
+
+#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
+/*
+ * Set EC J-PAKE password for current handshake
+ */
+int mbedtls_ssl_set_hs_ecjpake_password( mbedtls_ssl_context *ssl,
+ const unsigned char *pw,
+ size_t pw_len )
+{
+ mbedtls_ecjpake_role role;
+
+ if( ssl->handshake == NULL || ssl->conf == NULL )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
+ role = MBEDTLS_ECJPAKE_SERVER;
+ else
+ role = MBEDTLS_ECJPAKE_CLIENT;
+
+ return( mbedtls_ecjpake_setup( &ssl->handshake->ecjpake_ctx,
+ role,
+ MBEDTLS_MD_SHA256,
+ MBEDTLS_ECP_DP_SECP256R1,
+ pw, pw_len ) );
+}
+#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
+
+static void ssl_conf_remove_psk( mbedtls_ssl_config *conf )
+{
+ /* Remove reference to existing PSK, if any. */
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ if( ! mbedtls_svc_key_id_is_null( conf->psk_opaque ) )
+ {
+ /* The maintenance of the PSK key slot is the
+ * user's responsibility. */
+ conf->psk_opaque = MBEDTLS_SVC_KEY_ID_INIT;
+ }
+ /* This and the following branch should never
+ * be taken simultaenously as we maintain the
+ * invariant that raw and opaque PSKs are never
+ * configured simultaneously. As a safeguard,
+ * though, `else` is omitted here. */
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+ if( conf->psk != NULL )
+ {
+ mbedtls_platform_zeroize( conf->psk, conf->psk_len );
+
+ mbedtls_free( conf->psk );
+ conf->psk = NULL;
+ conf->psk_len = 0;
+ }
+
+ /* Remove reference to PSK identity, if any. */
+ if( conf->psk_identity != NULL )
+ {
+ mbedtls_free( conf->psk_identity );
+ conf->psk_identity = NULL;
+ conf->psk_identity_len = 0;
+ }
+}
+
+/* This function assumes that PSK identity in the SSL config is unset.
+ * It checks that the provided identity is well-formed and attempts
+ * to make a copy of it in the SSL config.
+ * On failure, the PSK identity in the config remains unset. */
+static int ssl_conf_set_psk_identity( mbedtls_ssl_config *conf,
+ unsigned char const *psk_identity,
+ size_t psk_identity_len )
+{
+ /* Identity len will be encoded on two bytes */
+ if( psk_identity == NULL ||
+ ( psk_identity_len >> 16 ) != 0 ||
+ psk_identity_len > MBEDTLS_SSL_OUT_CONTENT_LEN )
+ {
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ conf->psk_identity = mbedtls_calloc( 1, psk_identity_len );
+ if( conf->psk_identity == NULL )
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+
+ conf->psk_identity_len = psk_identity_len;
+ memcpy( conf->psk_identity, psk_identity, conf->psk_identity_len );
+
+ return( 0 );
+}
+
+int mbedtls_ssl_conf_psk( mbedtls_ssl_config *conf,
+ const unsigned char *psk, size_t psk_len,
+ const unsigned char *psk_identity, size_t psk_identity_len )
+{
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+ /* Remove opaque/raw PSK + PSK Identity */
+ ssl_conf_remove_psk( conf );
+
+ /* Check and set raw PSK */
+ if( psk == NULL )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ if( psk_len == 0 )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ if( psk_len > MBEDTLS_PSK_MAX_LEN )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ if( ( conf->psk = mbedtls_calloc( 1, psk_len ) ) == NULL )
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+ conf->psk_len = psk_len;
+ memcpy( conf->psk, psk, conf->psk_len );
+
+ /* Check and set PSK Identity */
+ ret = ssl_conf_set_psk_identity( conf, psk_identity, psk_identity_len );
+ if( ret != 0 )
+ ssl_conf_remove_psk( conf );
+
+ return( ret );
+}
+
+static void ssl_remove_psk( mbedtls_ssl_context *ssl )
+{
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ if( ! mbedtls_svc_key_id_is_null( ssl->handshake->psk_opaque ) )
+ {
+ ssl->handshake->psk_opaque = MBEDTLS_SVC_KEY_ID_INIT;
+ }
+ else
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+ if( ssl->handshake->psk != NULL )
+ {
+ mbedtls_platform_zeroize( ssl->handshake->psk,
+ ssl->handshake->psk_len );
+ mbedtls_free( ssl->handshake->psk );
+ ssl->handshake->psk_len = 0;
+ }
+}
+
+int mbedtls_ssl_set_hs_psk( mbedtls_ssl_context *ssl,
+ const unsigned char *psk, size_t psk_len )
+{
+ if( psk == NULL || ssl->handshake == NULL )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ if( psk_len > MBEDTLS_PSK_MAX_LEN )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ ssl_remove_psk( ssl );
+
+ if( ( ssl->handshake->psk = mbedtls_calloc( 1, psk_len ) ) == NULL )
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+
+ ssl->handshake->psk_len = psk_len;
+ memcpy( ssl->handshake->psk, psk, ssl->handshake->psk_len );
+
+ return( 0 );
+}
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+int mbedtls_ssl_conf_psk_opaque( mbedtls_ssl_config *conf,
+ psa_key_id_t psk,
+ const unsigned char *psk_identity,
+ size_t psk_identity_len )
+{
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+ /* Clear opaque/raw PSK + PSK Identity, if present. */
+ ssl_conf_remove_psk( conf );
+
+ /* Check and set opaque PSK */
+ if( mbedtls_svc_key_id_is_null( psk ) )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ conf->psk_opaque = psk;
+
+ /* Check and set PSK Identity */
+ ret = ssl_conf_set_psk_identity( conf, psk_identity,
+ psk_identity_len );
+ if( ret != 0 )
+ ssl_conf_remove_psk( conf );
+
+ return( ret );
+}
+
+int mbedtls_ssl_set_hs_psk_opaque( mbedtls_ssl_context *ssl,
+ psa_key_id_t psk )
+{
+ if( ( mbedtls_svc_key_id_is_null( psk ) ) ||
+ ( ssl->handshake == NULL ) )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ ssl_remove_psk( ssl );
+ ssl->handshake->psk_opaque = psk;
+ return( 0 );
+}
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
+void mbedtls_ssl_conf_psk_cb( mbedtls_ssl_config *conf,
+ int (*f_psk)(void *, mbedtls_ssl_context *, const unsigned char *,
+ size_t),
+ void *p_psk )
+{
+ conf->f_psk = f_psk;
+ conf->p_psk = p_psk;
+}
+#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
+
+#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
+
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+int mbedtls_ssl_conf_dh_param( mbedtls_ssl_config *conf, const char *dhm_P, const char *dhm_G )
+{
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+ if( ( ret = mbedtls_mpi_read_string( &conf->dhm_P, 16, dhm_P ) ) != 0 ||
+ ( ret = mbedtls_mpi_read_string( &conf->dhm_G, 16, dhm_G ) ) != 0 )
+ {
+ mbedtls_mpi_free( &conf->dhm_P );
+ mbedtls_mpi_free( &conf->dhm_G );
+ return( ret );
+ }
+
+ return( 0 );
+}
+#endif /* MBEDTLS_DEPRECATED_REMOVED */
+
+int mbedtls_ssl_conf_dh_param_bin( mbedtls_ssl_config *conf,
+ const unsigned char *dhm_P, size_t P_len,
+ const unsigned char *dhm_G, size_t G_len )
+{
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+ if( ( ret = mbedtls_mpi_read_binary( &conf->dhm_P, dhm_P, P_len ) ) != 0 ||
+ ( ret = mbedtls_mpi_read_binary( &conf->dhm_G, dhm_G, G_len ) ) != 0 )
+ {
+ mbedtls_mpi_free( &conf->dhm_P );
+ mbedtls_mpi_free( &conf->dhm_G );
+ return( ret );
+ }
+
+ return( 0 );
+}
+
+int mbedtls_ssl_conf_dh_param_ctx( mbedtls_ssl_config *conf, mbedtls_dhm_context *dhm_ctx )
+{
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+ if( ( ret = mbedtls_mpi_copy( &conf->dhm_P, &dhm_ctx->P ) ) != 0 ||
+ ( ret = mbedtls_mpi_copy( &conf->dhm_G, &dhm_ctx->G ) ) != 0 )
+ {
+ mbedtls_mpi_free( &conf->dhm_P );
+ mbedtls_mpi_free( &conf->dhm_G );
+ return( ret );
+ }
+
+ return( 0 );
+}
+#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_SRV_C */
+
+#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
+/*
+ * Set the minimum length for Diffie-Hellman parameters
+ */
+void mbedtls_ssl_conf_dhm_min_bitlen( mbedtls_ssl_config *conf,
+ unsigned int bitlen )
+{
+ conf->dhm_min_bitlen = bitlen;
+}
+#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_CLI_C */
+
+#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
+/*
+ * Set allowed/preferred hashes for handshake signatures
+ */
+void mbedtls_ssl_conf_sig_hashes( mbedtls_ssl_config *conf,
+ const int *hashes )
+{
+ conf->sig_hashes = hashes;
+}
+#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
+
+#if defined(MBEDTLS_ECP_C)
+/*
+ * Set the allowed elliptic curves
+ */
+void mbedtls_ssl_conf_curves( mbedtls_ssl_config *conf,
+ const mbedtls_ecp_group_id *curve_list )
+{
+ conf->curve_list = curve_list;
+}
+#endif /* MBEDTLS_ECP_C */
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+int mbedtls_ssl_set_hostname( mbedtls_ssl_context *ssl, const char *hostname )
+{
+ /* Initialize to suppress unnecessary compiler warning */
+ size_t hostname_len = 0;
+
+ /* Check if new hostname is valid before
+ * making any change to current one */
+ if( hostname != NULL )
+ {
+ hostname_len = strlen( hostname );
+
+ if( hostname_len > MBEDTLS_SSL_MAX_HOST_NAME_LEN )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ /* Now it's clear that we will overwrite the old hostname,
+ * so we can free it safely */
+
+ if( ssl->hostname != NULL )
+ {
+ mbedtls_platform_zeroize( ssl->hostname, strlen( ssl->hostname ) );
+ mbedtls_free( ssl->hostname );
+ }
+
+ /* Passing NULL as hostname shall clear the old one */
+
+ if( hostname == NULL )
+ {
+ ssl->hostname = NULL;
+ }
+ else
+ {
+ ssl->hostname = mbedtls_calloc( 1, hostname_len + 1 );
+ if( ssl->hostname == NULL )
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+
+ memcpy( ssl->hostname, hostname, hostname_len );
+
+ ssl->hostname[hostname_len] = '\0';
+ }
+
+ return( 0 );
+}
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
+void mbedtls_ssl_conf_sni( mbedtls_ssl_config *conf,
+ int (*f_sni)(void *, mbedtls_ssl_context *,
+ const unsigned char *, size_t),
+ void *p_sni )
+{
+ conf->f_sni = f_sni;
+ conf->p_sni = p_sni;
+}
+#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
+
+#if defined(MBEDTLS_SSL_ALPN)
+int mbedtls_ssl_conf_alpn_protocols( mbedtls_ssl_config *conf, const char **protos )
+{
+ size_t cur_len, tot_len;
+ const char **p;
+
+ /*
+ * RFC 7301 3.1: "Empty strings MUST NOT be included and byte strings
+ * MUST NOT be truncated."
+ * We check lengths now rather than later.
+ */
+ tot_len = 0;
+ for( p = protos; *p != NULL; p++ )
+ {
+ cur_len = strlen( *p );
+ tot_len += cur_len;
+
+ if( ( cur_len == 0 ) ||
+ ( cur_len > MBEDTLS_SSL_MAX_ALPN_NAME_LEN ) ||
+ ( tot_len > MBEDTLS_SSL_MAX_ALPN_LIST_LEN ) )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ conf->alpn_list = protos;
+
+ return( 0 );
+}
+
+const char *mbedtls_ssl_get_alpn_protocol( const mbedtls_ssl_context *ssl )
+{
+ return( ssl->alpn_chosen );
+}
+#endif /* MBEDTLS_SSL_ALPN */
+
+#if defined(MBEDTLS_SSL_DTLS_SRTP)
+void mbedtls_ssl_conf_srtp_mki_value_supported( mbedtls_ssl_config *conf,
+ int support_mki_value )
+{
+ conf->dtls_srtp_mki_support = support_mki_value;
+}
+
+int mbedtls_ssl_dtls_srtp_set_mki_value( mbedtls_ssl_context *ssl,
+ unsigned char *mki_value,
+ uint16_t mki_len )
+{
+ if( mki_len > MBEDTLS_TLS_SRTP_MAX_MKI_LENGTH )
+ {
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ if( ssl->conf->dtls_srtp_mki_support == MBEDTLS_SSL_DTLS_SRTP_MKI_UNSUPPORTED )
+ {
+ return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
+ }
+
+ memcpy( ssl->dtls_srtp_info.mki_value, mki_value, mki_len );
+ ssl->dtls_srtp_info.mki_len = mki_len;
+ return( 0 );
+}
+
+int mbedtls_ssl_conf_dtls_srtp_protection_profiles( mbedtls_ssl_config *conf,
+ const mbedtls_ssl_srtp_profile *profiles )
+{
+ const mbedtls_ssl_srtp_profile *p;
+ size_t list_size = 0;
+
+ /* check the profiles list: all entry must be valid,
+ * its size cannot be more than the total number of supported profiles, currently 4 */
+ for( p = profiles; *p != MBEDTLS_TLS_SRTP_UNSET &&
+ list_size <= MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH;
+ p++ )
+ {
+ if( mbedtls_ssl_check_srtp_profile_value( *p ) != MBEDTLS_TLS_SRTP_UNSET )
+ {
+ list_size++;
+ }
+ else
+ {
+ /* unsupported value, stop parsing and set the size to an error value */
+ list_size = MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH + 1;
+ }
+ }
+
+ if( list_size > MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH )
+ {
+ conf->dtls_srtp_profile_list = NULL;
+ conf->dtls_srtp_profile_list_len = 0;
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ conf->dtls_srtp_profile_list = profiles;
+ conf->dtls_srtp_profile_list_len = list_size;
+
+ return( 0 );
+}
+
+void mbedtls_ssl_get_dtls_srtp_negotiation_result( const mbedtls_ssl_context *ssl,
+ mbedtls_dtls_srtp_info *dtls_srtp_info )
+{
+ dtls_srtp_info->chosen_dtls_srtp_profile = ssl->dtls_srtp_info.chosen_dtls_srtp_profile;
+ /* do not copy the mki value if there is no chosen profile */
+ if( dtls_srtp_info->chosen_dtls_srtp_profile == MBEDTLS_TLS_SRTP_UNSET )
+ {
+ dtls_srtp_info->mki_len = 0;
+ }
+ else
+ {
+ dtls_srtp_info->mki_len = ssl->dtls_srtp_info.mki_len;
+ memcpy( dtls_srtp_info->mki_value, ssl->dtls_srtp_info.mki_value,
+ ssl->dtls_srtp_info.mki_len );
+ }
+}
+#endif /* MBEDTLS_SSL_DTLS_SRTP */
+
+void mbedtls_ssl_conf_max_version( mbedtls_ssl_config *conf, int major, int minor )
+{
+ conf->max_major_ver = major;
+ conf->max_minor_ver = minor;
+}
+
+void mbedtls_ssl_conf_min_version( mbedtls_ssl_config *conf, int major, int minor )
+{
+ conf->min_major_ver = major;
+ conf->min_minor_ver = minor;
+}
+
+#if defined(MBEDTLS_SSL_FALLBACK_SCSV) && defined(MBEDTLS_SSL_CLI_C)
+void mbedtls_ssl_conf_fallback( mbedtls_ssl_config *conf, char fallback )
+{
+ conf->fallback = fallback;
+}
+#endif
+
+#if defined(MBEDTLS_SSL_SRV_C)
+void mbedtls_ssl_conf_cert_req_ca_list( mbedtls_ssl_config *conf,
+ char cert_req_ca_list )
+{
+ conf->cert_req_ca_list = cert_req_ca_list;
+}
+#endif
+
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+void mbedtls_ssl_conf_encrypt_then_mac( mbedtls_ssl_config *conf, char etm )
+{
+ conf->encrypt_then_mac = etm;
+}
+#endif
+
+#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
+void mbedtls_ssl_conf_extended_master_secret( mbedtls_ssl_config *conf, char ems )
+{
+ conf->extended_ms = ems;
+}
+#endif
+
+#if defined(MBEDTLS_ARC4_C)
+void mbedtls_ssl_conf_arc4_support( mbedtls_ssl_config *conf, char arc4 )
+{
+ conf->arc4_disabled = arc4;
+}
+#endif
+
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+int mbedtls_ssl_conf_max_frag_len( mbedtls_ssl_config *conf, unsigned char mfl_code )
+{
+ if( mfl_code >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID ||
+ ssl_mfl_code_to_length( mfl_code ) > MBEDTLS_TLS_EXT_ADV_CONTENT_LEN )
+ {
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ conf->mfl_code = mfl_code;
+
+ return( 0 );
+}
+#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
+
+#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
+void mbedtls_ssl_conf_truncated_hmac( mbedtls_ssl_config *conf, int truncate )
+{
+ conf->trunc_hmac = truncate;
+}
+#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
+
+#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
+void mbedtls_ssl_conf_cbc_record_splitting( mbedtls_ssl_config *conf, char split )
+{
+ conf->cbc_record_splitting = split;
+}
+#endif
+
+void mbedtls_ssl_conf_legacy_renegotiation( mbedtls_ssl_config *conf, int allow_legacy )
+{
+ conf->allow_legacy_renegotiation = allow_legacy;
+}
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+void mbedtls_ssl_conf_renegotiation( mbedtls_ssl_config *conf, int renegotiation )
+{
+ conf->disable_renegotiation = renegotiation;
+}
+
+void mbedtls_ssl_conf_renegotiation_enforced( mbedtls_ssl_config *conf, int max_records )
+{
+ conf->renego_max_records = max_records;
+}
+
+void mbedtls_ssl_conf_renegotiation_period( mbedtls_ssl_config *conf,
+ const unsigned char period[8] )
+{
+ memcpy( conf->renego_period, period, 8 );
+}
+#endif /* MBEDTLS_SSL_RENEGOTIATION */
+
+#if defined(MBEDTLS_SSL_SESSION_TICKETS)
+#if defined(MBEDTLS_SSL_CLI_C)
+void mbedtls_ssl_conf_session_tickets( mbedtls_ssl_config *conf, int use_tickets )
+{
+ conf->session_tickets = use_tickets;
+}
+#endif
+
+#if defined(MBEDTLS_SSL_SRV_C)
+void mbedtls_ssl_conf_session_tickets_cb( mbedtls_ssl_config *conf,
+ mbedtls_ssl_ticket_write_t *f_ticket_write,
+ mbedtls_ssl_ticket_parse_t *f_ticket_parse,
+ void *p_ticket )
+{
+ conf->f_ticket_write = f_ticket_write;
+ conf->f_ticket_parse = f_ticket_parse;
+ conf->p_ticket = p_ticket;
+}
+#endif
+#endif /* MBEDTLS_SSL_SESSION_TICKETS */
+
+#if defined(MBEDTLS_SSL_EXPORT_KEYS)
+void mbedtls_ssl_conf_export_keys_cb( mbedtls_ssl_config *conf,
+ mbedtls_ssl_export_keys_t *f_export_keys,
+ void *p_export_keys )
+{
+ conf->f_export_keys = f_export_keys;
+ conf->p_export_keys = p_export_keys;
+}
+
+void mbedtls_ssl_conf_export_keys_ext_cb( mbedtls_ssl_config *conf,
+ mbedtls_ssl_export_keys_ext_t *f_export_keys_ext,
+ void *p_export_keys )
+{
+ conf->f_export_keys_ext = f_export_keys_ext;
+ conf->p_export_keys = p_export_keys;
+}
+#endif
+
+#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
+void mbedtls_ssl_conf_async_private_cb(
+ mbedtls_ssl_config *conf,
+ mbedtls_ssl_async_sign_t *f_async_sign,
+ mbedtls_ssl_async_decrypt_t *f_async_decrypt,
+ mbedtls_ssl_async_resume_t *f_async_resume,
+ mbedtls_ssl_async_cancel_t *f_async_cancel,
+ void *async_config_data )
+{
+ conf->f_async_sign_start = f_async_sign;
+ conf->f_async_decrypt_start = f_async_decrypt;
+ conf->f_async_resume = f_async_resume;
+ conf->f_async_cancel = f_async_cancel;
+ conf->p_async_config_data = async_config_data;
+}
+
+void *mbedtls_ssl_conf_get_async_config_data( const mbedtls_ssl_config *conf )
+{
+ return( conf->p_async_config_data );
+}
+
+void *mbedtls_ssl_get_async_operation_data( const mbedtls_ssl_context *ssl )
+{
+ if( ssl->handshake == NULL )
+ return( NULL );
+ else
+ return( ssl->handshake->user_async_ctx );
+}
+
+void mbedtls_ssl_set_async_operation_data( mbedtls_ssl_context *ssl,
+ void *ctx )
+{
+ if( ssl->handshake != NULL )
+ ssl->handshake->user_async_ctx = ctx;
+}
+#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
+
+/*
+ * SSL get accessors
+ */
+uint32_t mbedtls_ssl_get_verify_result( const mbedtls_ssl_context *ssl )
+{
+ if( ssl->session != NULL )
+ return( ssl->session->verify_result );
+
+ if( ssl->session_negotiate != NULL )
+ return( ssl->session_negotiate->verify_result );
+
+ return( 0xFFFFFFFF );
+}
+
+const char *mbedtls_ssl_get_ciphersuite( const mbedtls_ssl_context *ssl )
+{
+ if( ssl == NULL || ssl->session == NULL )
+ return( NULL );
+
+ return mbedtls_ssl_get_ciphersuite_name( ssl->session->ciphersuite );
+}
+
+const char *mbedtls_ssl_get_version( const mbedtls_ssl_context *ssl )
+{
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ switch( ssl->minor_ver )
+ {
+ case MBEDTLS_SSL_MINOR_VERSION_2:
+ return( "DTLSv1.0" );
+
+ case MBEDTLS_SSL_MINOR_VERSION_3:
+ return( "DTLSv1.2" );
+
+ default:
+ return( "unknown (DTLS)" );
+ }
+ }
+#endif
+
+ switch( ssl->minor_ver )
+ {
+ case MBEDTLS_SSL_MINOR_VERSION_0:
+ return( "SSLv3.0" );
+
+ case MBEDTLS_SSL_MINOR_VERSION_1:
+ return( "TLSv1.0" );
+
+ case MBEDTLS_SSL_MINOR_VERSION_2:
+ return( "TLSv1.1" );
+
+ case MBEDTLS_SSL_MINOR_VERSION_3:
+ return( "TLSv1.2" );
+
+ default:
+ return( "unknown" );
+ }
+}
+
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+size_t mbedtls_ssl_get_input_max_frag_len( const mbedtls_ssl_context *ssl )
+{
+ size_t max_len = MBEDTLS_SSL_MAX_CONTENT_LEN;
+ size_t read_mfl;
+
+ /* Use the configured MFL for the client if we're past SERVER_HELLO_DONE */
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
+ ssl->state >= MBEDTLS_SSL_SERVER_HELLO_DONE )
+ {
+ return ssl_mfl_code_to_length( ssl->conf->mfl_code );
+ }
+
+ /* Check if a smaller max length was negotiated */
+ if( ssl->session_out != NULL )
+ {
+ read_mfl = ssl_mfl_code_to_length( ssl->session_out->mfl_code );
+ if( read_mfl < max_len )
+ {
+ max_len = read_mfl;
+ }
+ }
+
+ // During a handshake, use the value being negotiated
+ if( ssl->session_negotiate != NULL )
+ {
+ read_mfl = ssl_mfl_code_to_length( ssl->session_negotiate->mfl_code );
+ if( read_mfl < max_len )
+ {
+ max_len = read_mfl;
+ }
+ }
+
+ return( max_len );
+}
+
+size_t mbedtls_ssl_get_output_max_frag_len( const mbedtls_ssl_context *ssl )
+{
+ size_t max_len;
+
+ /*
+ * Assume mfl_code is correct since it was checked when set
+ */
+ max_len = ssl_mfl_code_to_length( ssl->conf->mfl_code );
+
+ /* Check if a smaller max length was negotiated */
+ if( ssl->session_out != NULL &&
+ ssl_mfl_code_to_length( ssl->session_out->mfl_code ) < max_len )
+ {
+ max_len = ssl_mfl_code_to_length( ssl->session_out->mfl_code );
+ }
+
+ /* During a handshake, use the value being negotiated */
+ if( ssl->session_negotiate != NULL &&
+ ssl_mfl_code_to_length( ssl->session_negotiate->mfl_code ) < max_len )
+ {
+ max_len = ssl_mfl_code_to_length( ssl->session_negotiate->mfl_code );
+ }
+
+ return( max_len );
+}
+
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+size_t mbedtls_ssl_get_max_frag_len( const mbedtls_ssl_context *ssl )
+{
+ return mbedtls_ssl_get_output_max_frag_len( ssl );
+}
+#endif /* !MBEDTLS_DEPRECATED_REMOVED */
+#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+size_t mbedtls_ssl_get_current_mtu( const mbedtls_ssl_context *ssl )
+{
+ /* Return unlimited mtu for client hello messages to avoid fragmentation. */
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
+ ( ssl->state == MBEDTLS_SSL_CLIENT_HELLO ||
+ ssl->state == MBEDTLS_SSL_SERVER_HELLO ) )
+ return ( 0 );
+
+ if( ssl->handshake == NULL || ssl->handshake->mtu == 0 )
+ return( ssl->mtu );
+
+ if( ssl->mtu == 0 )
+ return( ssl->handshake->mtu );
+
+ return( ssl->mtu < ssl->handshake->mtu ?
+ ssl->mtu : ssl->handshake->mtu );
+}
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+int mbedtls_ssl_get_max_out_record_payload( const mbedtls_ssl_context *ssl )
+{
+ size_t max_len = MBEDTLS_SSL_OUT_CONTENT_LEN;
+
+#if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && \
+ !defined(MBEDTLS_SSL_PROTO_DTLS)
+ (void) ssl;
+#endif
+
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+ const size_t mfl = mbedtls_ssl_get_output_max_frag_len( ssl );
+
+ if( max_len > mfl )
+ max_len = mfl;
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( mbedtls_ssl_get_current_mtu( ssl ) != 0 )
+ {
+ const size_t mtu = mbedtls_ssl_get_current_mtu( ssl );
+ const int ret = mbedtls_ssl_get_record_expansion( ssl );
+ const size_t overhead = (size_t) ret;
+
+ if( ret < 0 )
+ return( ret );
+
+ if( mtu <= overhead )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "MTU too low for record expansion" ) );
+ return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
+ }
+
+ if( max_len > mtu - overhead )
+ max_len = mtu - overhead;
+ }
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+#if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && \
+ !defined(MBEDTLS_SSL_PROTO_DTLS)
+ ((void) ssl);
+#endif
+
+ return( (int) max_len );
+}
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+const mbedtls_x509_crt *mbedtls_ssl_get_peer_cert( const mbedtls_ssl_context *ssl )
+{
+ if( ssl == NULL || ssl->session == NULL )
+ return( NULL );
+
+#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+ return( ssl->session->peer_cert );
+#else
+ return( NULL );
+#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+}
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_SSL_CLI_C)
+int mbedtls_ssl_get_session( const mbedtls_ssl_context *ssl,
+ mbedtls_ssl_session *dst )
+{
+ if( ssl == NULL ||
+ dst == NULL ||
+ ssl->session == NULL ||
+ ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT )
+ {
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ return( mbedtls_ssl_session_copy( dst, ssl->session ) );
+}
+#endif /* MBEDTLS_SSL_CLI_C */
+
+const mbedtls_ssl_session *mbedtls_ssl_get_session_pointer( const mbedtls_ssl_context *ssl )
+{
+ if( ssl == NULL )
+ return( NULL );
+
+ return( ssl->session );
+}
+
+/*
+ * Define ticket header determining Mbed TLS version
+ * and structure of the ticket.
+ */
+
+/*
+ * Define bitflag determining compile-time settings influencing
+ * structure of serialized SSL sessions.
+ */
+
+#if defined(MBEDTLS_HAVE_TIME)
+#define SSL_SERIALIZED_SESSION_CONFIG_TIME 1
+#else
+#define SSL_SERIALIZED_SESSION_CONFIG_TIME 0
+#endif /* MBEDTLS_HAVE_TIME */
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+#define SSL_SERIALIZED_SESSION_CONFIG_CRT 1
+#else
+#define SSL_SERIALIZED_SESSION_CONFIG_CRT 0
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_SSL_CLI_C) && defined(MBEDTLS_SSL_SESSION_TICKETS)
+#define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET 1
+#else
+#define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET 0
+#endif /* MBEDTLS_SSL_CLI_C && MBEDTLS_SSL_SESSION_TICKETS */
+
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+#define SSL_SERIALIZED_SESSION_CONFIG_MFL 1
+#else
+#define SSL_SERIALIZED_SESSION_CONFIG_MFL 0
+#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
+
+#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
+#define SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC 1
+#else
+#define SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC 0
+#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
+
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+#define SSL_SERIALIZED_SESSION_CONFIG_ETM 1
+#else
+#define SSL_SERIALIZED_SESSION_CONFIG_ETM 0
+#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
+
+#if defined(MBEDTLS_SSL_SESSION_TICKETS)
+#define SSL_SERIALIZED_SESSION_CONFIG_TICKET 1
+#else
+#define SSL_SERIALIZED_SESSION_CONFIG_TICKET 0
+#endif /* MBEDTLS_SSL_SESSION_TICKETS */
+
+#define SSL_SERIALIZED_SESSION_CONFIG_TIME_BIT 0
+#define SSL_SERIALIZED_SESSION_CONFIG_CRT_BIT 1
+#define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET_BIT 2
+#define SSL_SERIALIZED_SESSION_CONFIG_MFL_BIT 3
+#define SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC_BIT 4
+#define SSL_SERIALIZED_SESSION_CONFIG_ETM_BIT 5
+#define SSL_SERIALIZED_SESSION_CONFIG_TICKET_BIT 6
+
+#define SSL_SERIALIZED_SESSION_CONFIG_BITFLAG \
+ ( (uint16_t) ( \
+ ( SSL_SERIALIZED_SESSION_CONFIG_TIME << SSL_SERIALIZED_SESSION_CONFIG_TIME_BIT ) | \
+ ( SSL_SERIALIZED_SESSION_CONFIG_CRT << SSL_SERIALIZED_SESSION_CONFIG_CRT_BIT ) | \
+ ( SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET << SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET_BIT ) | \
+ ( SSL_SERIALIZED_SESSION_CONFIG_MFL << SSL_SERIALIZED_SESSION_CONFIG_MFL_BIT ) | \
+ ( SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC << SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC_BIT ) | \
+ ( SSL_SERIALIZED_SESSION_CONFIG_ETM << SSL_SERIALIZED_SESSION_CONFIG_ETM_BIT ) | \
+ ( SSL_SERIALIZED_SESSION_CONFIG_TICKET << SSL_SERIALIZED_SESSION_CONFIG_TICKET_BIT ) ) )
+
+static unsigned char ssl_serialized_session_header[] = {
+ MBEDTLS_VERSION_MAJOR,
+ MBEDTLS_VERSION_MINOR,
+ MBEDTLS_VERSION_PATCH,
+ ( SSL_SERIALIZED_SESSION_CONFIG_BITFLAG >> 8 ) & 0xFF,
+ ( SSL_SERIALIZED_SESSION_CONFIG_BITFLAG >> 0 ) & 0xFF,
+};
+
+/*
+ * Serialize a session in the following format:
+ * (in the presentation language of TLS, RFC 8446 section 3)
+ *
+ * opaque mbedtls_version[3]; // major, minor, patch
+ * opaque session_format[2]; // version-specific 16-bit field determining
+ * // the format of the remaining
+ * // serialized data.
+ *
+ * Note: When updating the format, remember to keep
+ * these version+format bytes.
+ *
+ * // In this version, `session_format` determines
+ * // the setting of those compile-time
+ * // configuration options which influence
+ * // the structure of mbedtls_ssl_session.
+ * uint64 start_time;
+ * uint8 ciphersuite[2]; // defined by the standard
+ * uint8 compression; // 0 or 1
+ * uint8 session_id_len; // at most 32
+ * opaque session_id[32];
+ * opaque master[48]; // fixed length in the standard
+ * uint32 verify_result;
+ * opaque peer_cert<0..2^24-1>; // length 0 means no peer cert
+ * opaque ticket<0..2^24-1>; // length 0 means no ticket
+ * uint32 ticket_lifetime;
+ * uint8 mfl_code; // up to 255 according to standard
+ * uint8 trunc_hmac; // 0 or 1
+ * uint8 encrypt_then_mac; // 0 or 1
+ *
+ * The order is the same as in the definition of the structure, except
+ * verify_result is put before peer_cert so that all mandatory fields come
+ * together in one block.
+ */
+static int ssl_session_save( const mbedtls_ssl_session *session,
+ unsigned char omit_header,
+ unsigned char *buf,
+ size_t buf_len,
+ size_t *olen )
+{
+ unsigned char *p = buf;
+ size_t used = 0;
+#if defined(MBEDTLS_HAVE_TIME)
+ uint64_t start;
+#endif
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+ size_t cert_len;
+#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+
+ if( !omit_header )
+ {
+ /*
+ * Add version identifier
+ */
+
+ used += sizeof( ssl_serialized_session_header );
+
+ if( used <= buf_len )
+ {
+ memcpy( p, ssl_serialized_session_header,
+ sizeof( ssl_serialized_session_header ) );
+ p += sizeof( ssl_serialized_session_header );
+ }
+ }
+
+ /*
+ * Time
+ */
+#if defined(MBEDTLS_HAVE_TIME)
+ used += 8;
+
+ if( used <= buf_len )
+ {
+ start = (uint64_t) session->start;
+
+ *p++ = (unsigned char)( ( start >> 56 ) & 0xFF );
+ *p++ = (unsigned char)( ( start >> 48 ) & 0xFF );
+ *p++ = (unsigned char)( ( start >> 40 ) & 0xFF );
+ *p++ = (unsigned char)( ( start >> 32 ) & 0xFF );
+ *p++ = (unsigned char)( ( start >> 24 ) & 0xFF );
+ *p++ = (unsigned char)( ( start >> 16 ) & 0xFF );
+ *p++ = (unsigned char)( ( start >> 8 ) & 0xFF );
+ *p++ = (unsigned char)( ( start ) & 0xFF );
+ }
+#endif /* MBEDTLS_HAVE_TIME */
+
+ /*
+ * Basic mandatory fields
+ */
+ used += 2 /* ciphersuite */
+ + 1 /* compression */
+ + 1 /* id_len */
+ + sizeof( session->id )
+ + sizeof( session->master )
+ + 4; /* verify_result */
+
+ if( used <= buf_len )
+ {
+ *p++ = (unsigned char)( ( session->ciphersuite >> 8 ) & 0xFF );
+ *p++ = (unsigned char)( ( session->ciphersuite ) & 0xFF );
+
+ *p++ = (unsigned char)( session->compression & 0xFF );
+
+ *p++ = (unsigned char)( session->id_len & 0xFF );
+ memcpy( p, session->id, 32 );
+ p += 32;
+
+ memcpy( p, session->master, 48 );
+ p += 48;
+
+ *p++ = (unsigned char)( ( session->verify_result >> 24 ) & 0xFF );
+ *p++ = (unsigned char)( ( session->verify_result >> 16 ) & 0xFF );
+ *p++ = (unsigned char)( ( session->verify_result >> 8 ) & 0xFF );
+ *p++ = (unsigned char)( ( session->verify_result ) & 0xFF );
+ }
+
+ /*
+ * Peer's end-entity certificate
+ */
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+ if( session->peer_cert == NULL )
+ cert_len = 0;
+ else
+ cert_len = session->peer_cert->raw.len;
+
+ used += 3 + cert_len;
+
+ if( used <= buf_len )
+ {
+ *p++ = (unsigned char)( ( cert_len >> 16 ) & 0xFF );
+ *p++ = (unsigned char)( ( cert_len >> 8 ) & 0xFF );
+ *p++ = (unsigned char)( ( cert_len ) & 0xFF );
+
+ if( session->peer_cert != NULL )
+ {
+ memcpy( p, session->peer_cert->raw.p, cert_len );
+ p += cert_len;
+ }
+ }
+#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+ if( session->peer_cert_digest != NULL )
+ {
+ used += 1 /* type */ + 1 /* length */ + session->peer_cert_digest_len;
+ if( used <= buf_len )
+ {
+ *p++ = (unsigned char) session->peer_cert_digest_type;
+ *p++ = (unsigned char) session->peer_cert_digest_len;
+ memcpy( p, session->peer_cert_digest,
+ session->peer_cert_digest_len );
+ p += session->peer_cert_digest_len;
+ }
+ }
+ else
+ {
+ used += 2;
+ if( used <= buf_len )
+ {
+ *p++ = (unsigned char) MBEDTLS_MD_NONE;
+ *p++ = 0;
+ }
+ }
+#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+ /*
+ * Session ticket if any, plus associated data
+ */
+#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
+ used += 3 + session->ticket_len + 4; /* len + ticket + lifetime */
+
+ if( used <= buf_len )
+ {
+ *p++ = (unsigned char)( ( session->ticket_len >> 16 ) & 0xFF );
+ *p++ = (unsigned char)( ( session->ticket_len >> 8 ) & 0xFF );
+ *p++ = (unsigned char)( ( session->ticket_len ) & 0xFF );
+
+ if( session->ticket != NULL )
+ {
+ memcpy( p, session->ticket, session->ticket_len );
+ p += session->ticket_len;
+ }
+
+ *p++ = (unsigned char)( ( session->ticket_lifetime >> 24 ) & 0xFF );
+ *p++ = (unsigned char)( ( session->ticket_lifetime >> 16 ) & 0xFF );
+ *p++ = (unsigned char)( ( session->ticket_lifetime >> 8 ) & 0xFF );
+ *p++ = (unsigned char)( ( session->ticket_lifetime ) & 0xFF );
+ }
+#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
+
+ /*
+ * Misc extension-related info
+ */
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+ used += 1;
+
+ if( used <= buf_len )
+ *p++ = session->mfl_code;
+#endif
+
+#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
+ used += 1;
+
+ if( used <= buf_len )
+ *p++ = (unsigned char)( ( session->trunc_hmac ) & 0xFF );
+#endif
+
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+ used += 1;
+
+ if( used <= buf_len )
+ *p++ = (unsigned char)( ( session->encrypt_then_mac ) & 0xFF );
+#endif
+
+ /* Done */
+ *olen = used;
+
+ if( used > buf_len )
+ return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
+
+ return( 0 );
+}
+
+/*
+ * Public wrapper for ssl_session_save()
+ */
+int mbedtls_ssl_session_save( const mbedtls_ssl_session *session,
+ unsigned char *buf,
+ size_t buf_len,
+ size_t *olen )
+{
+ return( ssl_session_save( session, 0, buf, buf_len, olen ) );
+}
+
+/*
+ * Deserialize session, see mbedtls_ssl_session_save() for format.
+ *
+ * This internal version is wrapped by a public function that cleans up in
+ * case of error, and has an extra option omit_header.
+ */
+static int ssl_session_load( mbedtls_ssl_session *session,
+ unsigned char omit_header,
+ const unsigned char *buf,
+ size_t len )
+{
+ const unsigned char *p = buf;
+ const unsigned char * const end = buf + len;
+#if defined(MBEDTLS_HAVE_TIME)
+ uint64_t start;
+#endif
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+ size_t cert_len;
+#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+ if( !omit_header )
+ {
+ /*
+ * Check version identifier
+ */
+
+ if( (size_t)( end - p ) < sizeof( ssl_serialized_session_header ) )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ if( memcmp( p, ssl_serialized_session_header,
+ sizeof( ssl_serialized_session_header ) ) != 0 )
+ {
+ return( MBEDTLS_ERR_SSL_VERSION_MISMATCH );
+ }
+ p += sizeof( ssl_serialized_session_header );
+ }
+
+ /*
+ * Time
+ */
+#if defined(MBEDTLS_HAVE_TIME)
+ if( 8 > (size_t)( end - p ) )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ start = ( (uint64_t) p[0] << 56 ) |
+ ( (uint64_t) p[1] << 48 ) |
+ ( (uint64_t) p[2] << 40 ) |
+ ( (uint64_t) p[3] << 32 ) |
+ ( (uint64_t) p[4] << 24 ) |
+ ( (uint64_t) p[5] << 16 ) |
+ ( (uint64_t) p[6] << 8 ) |
+ ( (uint64_t) p[7] );
+ p += 8;
+
+ session->start = (time_t) start;
+#endif /* MBEDTLS_HAVE_TIME */
+
+ /*
+ * Basic mandatory fields
+ */
+ if( 2 + 1 + 1 + 32 + 48 + 4 > (size_t)( end - p ) )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ session->ciphersuite = ( p[0] << 8 ) | p[1];
+ p += 2;
+
+ session->compression = *p++;
+
+ session->id_len = *p++;
+ memcpy( session->id, p, 32 );
+ p += 32;
+
+ memcpy( session->master, p, 48 );
+ p += 48;
+
+ session->verify_result = ( (uint32_t) p[0] << 24 ) |
+ ( (uint32_t) p[1] << 16 ) |
+ ( (uint32_t) p[2] << 8 ) |
+ ( (uint32_t) p[3] );
+ p += 4;
+
+ /* Immediately clear invalid pointer values that have been read, in case
+ * we exit early before we replaced them with valid ones. */
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+ session->peer_cert = NULL;
+#else
+ session->peer_cert_digest = NULL;
+#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
+ session->ticket = NULL;
+#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
+
+ /*
+ * Peer certificate
+ */
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+ /* Deserialize CRT from the end of the ticket. */
+ if( 3 > (size_t)( end - p ) )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ cert_len = ( p[0] << 16 ) | ( p[1] << 8 ) | p[2];
+ p += 3;
+
+ if( cert_len != 0 )
+ {
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+ if( cert_len > (size_t)( end - p ) )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ session->peer_cert = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) );
+
+ if( session->peer_cert == NULL )
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+
+ mbedtls_x509_crt_init( session->peer_cert );
+
+ if( ( ret = mbedtls_x509_crt_parse_der( session->peer_cert,
+ p, cert_len ) ) != 0 )
+ {
+ mbedtls_x509_crt_free( session->peer_cert );
+ mbedtls_free( session->peer_cert );
+ session->peer_cert = NULL;
+ return( ret );
+ }
+
+ p += cert_len;
+ }
+#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+ /* Deserialize CRT digest from the end of the ticket. */
+ if( 2 > (size_t)( end - p ) )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ session->peer_cert_digest_type = (mbedtls_md_type_t) *p++;
+ session->peer_cert_digest_len = (size_t) *p++;
+
+ if( session->peer_cert_digest_len != 0 )
+ {
+ const mbedtls_md_info_t *md_info =
+ mbedtls_md_info_from_type( session->peer_cert_digest_type );
+ if( md_info == NULL )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ if( session->peer_cert_digest_len != mbedtls_md_get_size( md_info ) )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ if( session->peer_cert_digest_len > (size_t)( end - p ) )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ session->peer_cert_digest =
+ mbedtls_calloc( 1, session->peer_cert_digest_len );
+ if( session->peer_cert_digest == NULL )
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+
+ memcpy( session->peer_cert_digest, p,
+ session->peer_cert_digest_len );
+ p += session->peer_cert_digest_len;
+ }
+#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+ /*
+ * Session ticket and associated data
+ */
+#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
+ if( 3 > (size_t)( end - p ) )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ session->ticket_len = ( p[0] << 16 ) | ( p[1] << 8 ) | p[2];
+ p += 3;
+
+ if( session->ticket_len != 0 )
+ {
+ if( session->ticket_len > (size_t)( end - p ) )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ session->ticket = mbedtls_calloc( 1, session->ticket_len );
+ if( session->ticket == NULL )
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+
+ memcpy( session->ticket, p, session->ticket_len );
+ p += session->ticket_len;
+ }
+
+ if( 4 > (size_t)( end - p ) )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ session->ticket_lifetime = ( (uint32_t) p[0] << 24 ) |
+ ( (uint32_t) p[1] << 16 ) |
+ ( (uint32_t) p[2] << 8 ) |
+ ( (uint32_t) p[3] );
+ p += 4;
+#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
+
+ /*
+ * Misc extension-related info
+ */
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+ if( 1 > (size_t)( end - p ) )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ session->mfl_code = *p++;
+#endif
+
+#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
+ if( 1 > (size_t)( end - p ) )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ session->trunc_hmac = *p++;
+#endif
+
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+ if( 1 > (size_t)( end - p ) )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ session->encrypt_then_mac = *p++;
+#endif
+
+ /* Done, should have consumed entire buffer */
+ if( p != end )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ return( 0 );
+}
+
+/*
+ * Deserialize session: public wrapper for error cleaning
+ */
+int mbedtls_ssl_session_load( mbedtls_ssl_session *session,
+ const unsigned char *buf,
+ size_t len )
+{
+ int ret = ssl_session_load( session, 0, buf, len );
+
+ if( ret != 0 )
+ mbedtls_ssl_session_free( session );
+
+ return( ret );
+}
+
+/*
+ * Perform a single step of the SSL handshake
+ */
+int mbedtls_ssl_handshake_step( mbedtls_ssl_context *ssl )
+{
+ int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
+
+ if( ssl == NULL || ssl->conf == NULL )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+#if defined(MBEDTLS_SSL_CLI_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
+ ret = mbedtls_ssl_handshake_client_step( ssl );
+#endif
+#if defined(MBEDTLS_SSL_SRV_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
+ ret = mbedtls_ssl_handshake_server_step( ssl );
+#endif
+
+ return( ret );
+}
+
+/*
+ * Perform the SSL handshake
+ */
+int mbedtls_ssl_handshake( mbedtls_ssl_context *ssl )
+{
+ int ret = 0;
+
+ /* Sanity checks */
+
+ if( ssl == NULL || ssl->conf == NULL )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+ ( ssl->f_set_timer == NULL || ssl->f_get_timer == NULL ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "You must use "
+ "mbedtls_ssl_set_timer_cb() for DTLS" ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> handshake" ) );
+
+ /* Main handshake loop */
+ while( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
+ {
+ ret = mbedtls_ssl_handshake_step( ssl );
+
+ if( ret != 0 )
+ break;
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= handshake" ) );
+
+ return( ret );
+}
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+#if defined(MBEDTLS_SSL_SRV_C)
+/*
+ * Write HelloRequest to request renegotiation on server
+ */
+static int ssl_write_hello_request( mbedtls_ssl_context *ssl )
+{
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello request" ) );
+
+ ssl->out_msglen = 4;
+ ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
+ ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_REQUEST;
+
+ if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret );
+ return( ret );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello request" ) );
+
+ return( 0 );
+}
+#endif /* MBEDTLS_SSL_SRV_C */
+
+/*
+ * Actually renegotiate current connection, triggered by either:
+ * - any side: calling mbedtls_ssl_renegotiate(),
+ * - client: receiving a HelloRequest during mbedtls_ssl_read(),
+ * - server: receiving any handshake message on server during mbedtls_ssl_read() after
+ * the initial handshake is completed.
+ * If the handshake doesn't complete due to waiting for I/O, it will continue
+ * during the next calls to mbedtls_ssl_renegotiate() or mbedtls_ssl_read() respectively.
+ */
+int mbedtls_ssl_start_renegotiation( mbedtls_ssl_context *ssl )
+{
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> renegotiate" ) );
+
+ if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
+ return( ret );
+
+ /* RFC 6347 4.2.2: "[...] the HelloRequest will have message_seq = 0 and
+ * the ServerHello will have message_seq = 1" */
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+ ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
+ {
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
+ ssl->handshake->out_msg_seq = 1;
+ else
+ ssl->handshake->in_msg_seq = 1;
+ }
+#endif
+
+ ssl->state = MBEDTLS_SSL_HELLO_REQUEST;
+ ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS;
+
+ if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
+ return( ret );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= renegotiate" ) );
+
+ return( 0 );
+}
+
+/*
+ * Renegotiate current connection on client,
+ * or request renegotiation on server
+ */
+int mbedtls_ssl_renegotiate( mbedtls_ssl_context *ssl )
+{
+ int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
+
+ if( ssl == NULL || ssl->conf == NULL )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+#if defined(MBEDTLS_SSL_SRV_C)
+ /* On server, just send the request */
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
+ {
+ if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING;
+
+ /* Did we already try/start sending HelloRequest? */
+ if( ssl->out_left != 0 )
+ return( mbedtls_ssl_flush_output( ssl ) );
+
+ return( ssl_write_hello_request( ssl ) );
+ }
+#endif /* MBEDTLS_SSL_SRV_C */
+
+#if defined(MBEDTLS_SSL_CLI_C)
+ /*
+ * On client, either start the renegotiation process or,
+ * if already in progress, continue the handshake
+ */
+ if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
+ {
+ if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ if( ( ret = mbedtls_ssl_start_renegotiation( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_start_renegotiation", ret );
+ return( ret );
+ }
+ }
+ else
+ {
+ if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
+ return( ret );
+ }
+ }
+#endif /* MBEDTLS_SSL_CLI_C */
+
+ return( ret );
+}
+#endif /* MBEDTLS_SSL_RENEGOTIATION */
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+static void ssl_key_cert_free( mbedtls_ssl_key_cert *key_cert )
+{
+ mbedtls_ssl_key_cert *cur = key_cert, *next;
+
+ while( cur != NULL )
+ {
+ next = cur->next;
+ mbedtls_free( cur );
+ cur = next;
+ }
+}
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+void mbedtls_ssl_handshake_free( mbedtls_ssl_context *ssl )
+{
+ mbedtls_ssl_handshake_params *handshake = ssl->handshake;
+
+ if( handshake == NULL )
+ return;
+
+#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
+ if( ssl->conf->f_async_cancel != NULL && handshake->async_in_progress != 0 )
+ {
+ ssl->conf->f_async_cancel( ssl );
+ handshake->async_in_progress = 0;
+ }
+#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_1)
+ mbedtls_md5_free( &handshake->fin_md5 );
+ mbedtls_sha1_free( &handshake->fin_sha1 );
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA256_C)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ psa_hash_abort( &handshake->fin_sha256_psa );
+#else
+ mbedtls_sha256_free( &handshake->fin_sha256 );
+#endif
+#endif
+#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ psa_hash_abort( &handshake->fin_sha384_psa );
+#else
+ mbedtls_sha512_free( &handshake->fin_sha512 );
+#endif
+#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+
+#if defined(MBEDTLS_DHM_C)
+ mbedtls_dhm_free( &handshake->dhm_ctx );
+#endif
+#if defined(MBEDTLS_ECDH_C)
+ mbedtls_ecdh_free( &handshake->ecdh_ctx );
+#endif
+#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
+ mbedtls_ecjpake_free( &handshake->ecjpake_ctx );
+#if defined(MBEDTLS_SSL_CLI_C)
+ mbedtls_free( handshake->ecjpake_cache );
+ handshake->ecjpake_cache = NULL;
+ handshake->ecjpake_cache_len = 0;
+#endif
+#endif
+
+#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
+ defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
+ /* explicit void pointer cast for buggy MS compiler */
+ mbedtls_free( (void *) handshake->curves );
+#endif
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
+ if( handshake->psk != NULL )
+ {
+ mbedtls_platform_zeroize( handshake->psk, handshake->psk_len );
+ mbedtls_free( handshake->psk );
+ }
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
+ defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
+ /*
+ * Free only the linked list wrapper, not the keys themselves
+ * since the belong to the SNI callback
+ */
+ if( handshake->sni_key_cert != NULL )
+ {
+ mbedtls_ssl_key_cert *cur = handshake->sni_key_cert, *next;
+
+ while( cur != NULL )
+ {
+ next = cur->next;
+ mbedtls_free( cur );
+ cur = next;
+ }
+ }
+#endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_SERVER_NAME_INDICATION */
+
+#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
+ mbedtls_x509_crt_restart_free( &handshake->ecrs_ctx );
+ if( handshake->ecrs_peer_cert != NULL )
+ {
+ mbedtls_x509_crt_free( handshake->ecrs_peer_cert );
+ mbedtls_free( handshake->ecrs_peer_cert );
+ }
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
+ !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+ mbedtls_pk_free( &handshake->peer_pubkey );
+#endif /* MBEDTLS_X509_CRT_PARSE_C && !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ mbedtls_free( handshake->verify_cookie );
+ mbedtls_ssl_flight_free( handshake->flight );
+ mbedtls_ssl_buffering_free( ssl );
+#endif
+
+#if defined(MBEDTLS_ECDH_C) && \
+ defined(MBEDTLS_USE_PSA_CRYPTO)
+ psa_destroy_key( handshake->ecdh_psa_privkey );
+#endif /* MBEDTLS_ECDH_C && MBEDTLS_USE_PSA_CRYPTO */
+
+ mbedtls_platform_zeroize( handshake,
+ sizeof( mbedtls_ssl_handshake_params ) );
+
+#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
+ /* If the buffers are too big - reallocate. Because of the way Mbed TLS
+ * processes datagrams and the fact that a datagram is allowed to have
+ * several records in it, it is possible that the I/O buffers are not
+ * empty at this stage */
+ handle_buffer_resizing( ssl, 1, mbedtls_ssl_get_input_buflen( ssl ),
+ mbedtls_ssl_get_output_buflen( ssl ) );
+#endif
+}
+
+void mbedtls_ssl_session_free( mbedtls_ssl_session *session )
+{
+ if( session == NULL )
+ return;
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+ ssl_clear_peer_cert( session );
+#endif
+
+#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
+ mbedtls_free( session->ticket );
+#endif
+
+ mbedtls_platform_zeroize( session, sizeof( mbedtls_ssl_session ) );
+}
+
+#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID 1u
+#else
+#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID 0u
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+
+#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
+#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT 1u
+#else
+#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT 0u
+#endif /* MBEDTLS_SSL_DTLS_BADMAC_LIMIT */
+
+#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
+#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY 1u
+#else
+#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY 0u
+#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */
+
+#if defined(MBEDTLS_SSL_ALPN)
+#define SSL_SERIALIZED_CONTEXT_CONFIG_ALPN 1u
+#else
+#define SSL_SERIALIZED_CONTEXT_CONFIG_ALPN 0u
+#endif /* MBEDTLS_SSL_ALPN */
+
+#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT 0
+#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT 1
+#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY_BIT 2
+#define SSL_SERIALIZED_CONTEXT_CONFIG_ALPN_BIT 3
+
+#define SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG \
+ ( (uint32_t) ( \
+ ( SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID << SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT ) | \
+ ( SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT << SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT ) | \
+ ( SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY << SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY_BIT ) | \
+ ( SSL_SERIALIZED_CONTEXT_CONFIG_ALPN << SSL_SERIALIZED_CONTEXT_CONFIG_ALPN_BIT ) | \
+ 0u ) )
+
+static unsigned char ssl_serialized_context_header[] = {
+ MBEDTLS_VERSION_MAJOR,
+ MBEDTLS_VERSION_MINOR,
+ MBEDTLS_VERSION_PATCH,
+ ( SSL_SERIALIZED_SESSION_CONFIG_BITFLAG >> 8 ) & 0xFF,
+ ( SSL_SERIALIZED_SESSION_CONFIG_BITFLAG >> 0 ) & 0xFF,
+ ( SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG >> 16 ) & 0xFF,
+ ( SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG >> 8 ) & 0xFF,
+ ( SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG >> 0 ) & 0xFF,
+};
+
+/*
+ * Serialize a full SSL context
+ *
+ * The format of the serialized data is:
+ * (in the presentation language of TLS, RFC 8446 section 3)
+ *
+ * // header
+ * opaque mbedtls_version[3]; // major, minor, patch
+ * opaque context_format[5]; // version-specific field determining
+ * // the format of the remaining
+ * // serialized data.
+ * Note: When updating the format, remember to keep these
+ * version+format bytes. (We may make their size part of the API.)
+ *
+ * // session sub-structure
+ * opaque session<1..2^32-1>; // see mbedtls_ssl_session_save()
+ * // transform sub-structure
+ * uint8 random[64]; // ServerHello.random+ClientHello.random
+ * uint8 in_cid<0..2^8-1> // Connection ID: expected incoming value
+ * uint8 out_cid<0..2^8-1> // Connection ID: outgoing value to use
+ * // fields from ssl_context
+ * uint32 badmac_seen; // DTLS: number of records with failing MAC
+ * uint64 in_window_top; // DTLS: last validated record seq_num
+ * uint64 in_window; // DTLS: bitmask for replay protection
+ * uint8 disable_datagram_packing; // DTLS: only one record per datagram
+ * uint64 cur_out_ctr; // Record layer: outgoing sequence number
+ * uint16 mtu; // DTLS: path mtu (max outgoing fragment size)
+ * uint8 alpn_chosen<0..2^8-1> // ALPN: negotiated application protocol
+ *
+ * Note that many fields of the ssl_context or sub-structures are not
+ * serialized, as they fall in one of the following categories:
+ *
+ * 1. forced value (eg in_left must be 0)
+ * 2. pointer to dynamically-allocated memory (eg session, transform)
+ * 3. value can be re-derived from other data (eg session keys from MS)
+ * 4. value was temporary (eg content of input buffer)
+ * 5. value will be provided by the user again (eg I/O callbacks and context)
+ */
+int mbedtls_ssl_context_save( mbedtls_ssl_context *ssl,
+ unsigned char *buf,
+ size_t buf_len,
+ size_t *olen )
+{
+ unsigned char *p = buf;
+ size_t used = 0;
+ size_t session_len;
+ int ret = 0;
+
+ /*
+ * Enforce usage restrictions, see "return BAD_INPUT_DATA" in
+ * this function's documentation.
+ *
+ * These are due to assumptions/limitations in the implementation. Some of
+ * them are likely to stay (no handshake in progress) some might go away
+ * (only DTLS) but are currently used to simplify the implementation.
+ */
+ /* The initial handshake must be over */
+ if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Initial handshake isn't over" ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+ if( ssl->handshake != NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Handshake isn't completed" ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+ /* Double-check that sub-structures are indeed ready */
+ if( ssl->transform == NULL || ssl->session == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Serialised structures aren't ready" ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+ /* There must be no pending incoming or outgoing data */
+ if( mbedtls_ssl_check_pending( ssl ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "There is pending incoming data" ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+ if( ssl->out_left != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "There is pending outgoing data" ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+ /* Protocol must be DLTS, not TLS */
+ if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Only DTLS is supported" ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+ /* Version must be 1.2 */
+ if( ssl->major_ver != MBEDTLS_SSL_MAJOR_VERSION_3 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Only version 1.2 supported" ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+ if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Only version 1.2 supported" ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+ /* We must be using an AEAD ciphersuite */
+ if( mbedtls_ssl_transform_uses_aead( ssl->transform ) != 1 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Only AEAD ciphersuites supported" ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+ /* Renegotiation must not be enabled */
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+ if( ssl->conf->disable_renegotiation != MBEDTLS_SSL_RENEGOTIATION_DISABLED )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Renegotiation must not be enabled" ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+#endif
+
+ /*
+ * Version and format identifier
+ */
+ used += sizeof( ssl_serialized_context_header );
+
+ if( used <= buf_len )
+ {
+ memcpy( p, ssl_serialized_context_header,
+ sizeof( ssl_serialized_context_header ) );
+ p += sizeof( ssl_serialized_context_header );
+ }
+
+ /*
+ * Session (length + data)
+ */
+ ret = ssl_session_save( ssl->session, 1, NULL, 0, &session_len );
+ if( ret != MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL )
+ return( ret );
+
+ used += 4 + session_len;
+ if( used <= buf_len )
+ {
+ *p++ = (unsigned char)( ( session_len >> 24 ) & 0xFF );
+ *p++ = (unsigned char)( ( session_len >> 16 ) & 0xFF );
+ *p++ = (unsigned char)( ( session_len >> 8 ) & 0xFF );
+ *p++ = (unsigned char)( ( session_len ) & 0xFF );
+
+ ret = ssl_session_save( ssl->session, 1,
+ p, session_len, &session_len );
+ if( ret != 0 )
+ return( ret );
+
+ p += session_len;
+ }
+
+ /*
+ * Transform
+ */
+ used += sizeof( ssl->transform->randbytes );
+ if( used <= buf_len )
+ {
+ memcpy( p, ssl->transform->randbytes,
+ sizeof( ssl->transform->randbytes ) );
+ p += sizeof( ssl->transform->randbytes );
+ }
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+ used += 2 + ssl->transform->in_cid_len + ssl->transform->out_cid_len;
+ if( used <= buf_len )
+ {
+ *p++ = ssl->transform->in_cid_len;
+ memcpy( p, ssl->transform->in_cid, ssl->transform->in_cid_len );
+ p += ssl->transform->in_cid_len;
+
+ *p++ = ssl->transform->out_cid_len;
+ memcpy( p, ssl->transform->out_cid, ssl->transform->out_cid_len );
+ p += ssl->transform->out_cid_len;
+ }
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+
+ /*
+ * Saved fields from top-level ssl_context structure
+ */
+#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
+ used += 4;
+ if( used <= buf_len )
+ {
+ *p++ = (unsigned char)( ( ssl->badmac_seen >> 24 ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->badmac_seen >> 16 ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->badmac_seen >> 8 ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->badmac_seen ) & 0xFF );
+ }
+#endif /* MBEDTLS_SSL_DTLS_BADMAC_LIMIT */
+
+#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
+ used += 16;
+ if( used <= buf_len )
+ {
+ *p++ = (unsigned char)( ( ssl->in_window_top >> 56 ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->in_window_top >> 48 ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->in_window_top >> 40 ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->in_window_top >> 32 ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->in_window_top >> 24 ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->in_window_top >> 16 ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->in_window_top >> 8 ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->in_window_top ) & 0xFF );
+
+ *p++ = (unsigned char)( ( ssl->in_window >> 56 ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->in_window >> 48 ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->in_window >> 40 ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->in_window >> 32 ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->in_window >> 24 ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->in_window >> 16 ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->in_window >> 8 ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->in_window ) & 0xFF );
+ }
+#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ used += 1;
+ if( used <= buf_len )
+ {
+ *p++ = ssl->disable_datagram_packing;
+ }
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+ used += 8;
+ if( used <= buf_len )
+ {
+ memcpy( p, ssl->cur_out_ctr, 8 );
+ p += 8;
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ used += 2;
+ if( used <= buf_len )
+ {
+ *p++ = (unsigned char)( ( ssl->mtu >> 8 ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->mtu ) & 0xFF );
+ }
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+#if defined(MBEDTLS_SSL_ALPN)
+ {
+ const uint8_t alpn_len = ssl->alpn_chosen
+ ? (uint8_t) strlen( ssl->alpn_chosen )
+ : 0;
+
+ used += 1 + alpn_len;
+ if( used <= buf_len )
+ {
+ *p++ = alpn_len;
+
+ if( ssl->alpn_chosen != NULL )
+ {
+ memcpy( p, ssl->alpn_chosen, alpn_len );
+ p += alpn_len;
+ }
+ }
+ }
+#endif /* MBEDTLS_SSL_ALPN */
+
+ /*
+ * Done
+ */
+ *olen = used;
+
+ if( used > buf_len )
+ return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "saved context", buf, used );
+
+ return( mbedtls_ssl_session_reset_int( ssl, 0 ) );
+}
+
+/*
+ * Helper to get TLS 1.2 PRF from ciphersuite
+ * (Duplicates bits of logic from ssl_set_handshake_prfs().)
+ */
+typedef int (*tls_prf_fn)( const unsigned char *secret, size_t slen,
+ const char *label,
+ const unsigned char *random, size_t rlen,
+ unsigned char *dstbuf, size_t dlen );
+static tls_prf_fn ssl_tls12prf_from_cs( int ciphersuite_id )
+{
+#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
+ const mbedtls_ssl_ciphersuite_t * const ciphersuite_info =
+ mbedtls_ssl_ciphersuite_from_id( ciphersuite_id );
+
+ if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
+ return( tls_prf_sha384 );
+#else
+ (void) ciphersuite_id;
+#endif
+ return( tls_prf_sha256 );
+}
+
+/*
+ * Deserialize context, see mbedtls_ssl_context_save() for format.
+ *
+ * This internal version is wrapped by a public function that cleans up in
+ * case of error.
+ */
+static int ssl_context_load( mbedtls_ssl_context *ssl,
+ const unsigned char *buf,
+ size_t len )
+{
+ const unsigned char *p = buf;
+ const unsigned char * const end = buf + len;
+ size_t session_len;
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+ /*
+ * The context should have been freshly setup or reset.
+ * Give the user an error in case of obvious misuse.
+ * (Checking session is useful because it won't be NULL if we're
+ * renegotiating, or if the user mistakenly loaded a session first.)
+ */
+ if( ssl->state != MBEDTLS_SSL_HELLO_REQUEST ||
+ ssl->session != NULL )
+ {
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ /*
+ * We can't check that the config matches the initial one, but we can at
+ * least check it matches the requirements for serializing.
+ */
+ if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ||
+ ssl->conf->max_major_ver < MBEDTLS_SSL_MAJOR_VERSION_3 ||
+ ssl->conf->min_major_ver > MBEDTLS_SSL_MAJOR_VERSION_3 ||
+ ssl->conf->max_minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 ||
+ ssl->conf->min_minor_ver > MBEDTLS_SSL_MINOR_VERSION_3 ||
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+ ssl->conf->disable_renegotiation != MBEDTLS_SSL_RENEGOTIATION_DISABLED ||
+#endif
+ 0 )
+ {
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "context to load", buf, len );
+
+ /*
+ * Check version identifier
+ */
+ if( (size_t)( end - p ) < sizeof( ssl_serialized_context_header ) )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ if( memcmp( p, ssl_serialized_context_header,
+ sizeof( ssl_serialized_context_header ) ) != 0 )
+ {
+ return( MBEDTLS_ERR_SSL_VERSION_MISMATCH );
+ }
+ p += sizeof( ssl_serialized_context_header );
+
+ /*
+ * Session
+ */
+ if( (size_t)( end - p ) < 4 )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ session_len = ( (size_t) p[0] << 24 ) |
+ ( (size_t) p[1] << 16 ) |
+ ( (size_t) p[2] << 8 ) |
+ ( (size_t) p[3] );
+ p += 4;
+
+ /* This has been allocated by ssl_handshake_init(), called by
+ * by either mbedtls_ssl_session_reset_int() or mbedtls_ssl_setup(). */
+ ssl->session = ssl->session_negotiate;
+ ssl->session_in = ssl->session;
+ ssl->session_out = ssl->session;
+ ssl->session_negotiate = NULL;
+
+ if( (size_t)( end - p ) < session_len )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ ret = ssl_session_load( ssl->session, 1, p, session_len );
+ if( ret != 0 )
+ {
+ mbedtls_ssl_session_free( ssl->session );
+ return( ret );
+ }
+
+ p += session_len;
+
+ /*
+ * Transform
+ */
+
+ /* This has been allocated by ssl_handshake_init(), called by
+ * by either mbedtls_ssl_session_reset_int() or mbedtls_ssl_setup(). */
+ ssl->transform = ssl->transform_negotiate;
+ ssl->transform_in = ssl->transform;
+ ssl->transform_out = ssl->transform;
+ ssl->transform_negotiate = NULL;
+
+ /* Read random bytes and populate structure */
+ if( (size_t)( end - p ) < sizeof( ssl->transform->randbytes ) )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ ret = ssl_populate_transform( ssl->transform,
+ ssl->session->ciphersuite,
+ ssl->session->master,
+#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC)
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+ ssl->session->encrypt_then_mac,
+#endif
+#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
+ ssl->session->trunc_hmac,
+#endif
+#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */
+#if defined(MBEDTLS_ZLIB_SUPPORT)
+ ssl->session->compression,
+#endif
+ ssl_tls12prf_from_cs( ssl->session->ciphersuite ),
+ p, /* currently pointing to randbytes */
+ MBEDTLS_SSL_MINOR_VERSION_3, /* (D)TLS 1.2 is forced */
+ ssl->conf->endpoint,
+ ssl );
+ if( ret != 0 )
+ return( ret );
+
+ p += sizeof( ssl->transform->randbytes );
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+ /* Read connection IDs and store them */
+ if( (size_t)( end - p ) < 1 )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ ssl->transform->in_cid_len = *p++;
+
+ if( (size_t)( end - p ) < ssl->transform->in_cid_len + 1u )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ memcpy( ssl->transform->in_cid, p, ssl->transform->in_cid_len );
+ p += ssl->transform->in_cid_len;
+
+ ssl->transform->out_cid_len = *p++;
+
+ if( (size_t)( end - p ) < ssl->transform->out_cid_len )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ memcpy( ssl->transform->out_cid, p, ssl->transform->out_cid_len );
+ p += ssl->transform->out_cid_len;
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+
+ /*
+ * Saved fields from top-level ssl_context structure
+ */
+#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
+ if( (size_t)( end - p ) < 4 )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ ssl->badmac_seen = ( (uint32_t) p[0] << 24 ) |
+ ( (uint32_t) p[1] << 16 ) |
+ ( (uint32_t) p[2] << 8 ) |
+ ( (uint32_t) p[3] );
+ p += 4;
+#endif /* MBEDTLS_SSL_DTLS_BADMAC_LIMIT */
+
+#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
+ if( (size_t)( end - p ) < 16 )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ ssl->in_window_top = ( (uint64_t) p[0] << 56 ) |
+ ( (uint64_t) p[1] << 48 ) |
+ ( (uint64_t) p[2] << 40 ) |
+ ( (uint64_t) p[3] << 32 ) |
+ ( (uint64_t) p[4] << 24 ) |
+ ( (uint64_t) p[5] << 16 ) |
+ ( (uint64_t) p[6] << 8 ) |
+ ( (uint64_t) p[7] );
+ p += 8;
+
+ ssl->in_window = ( (uint64_t) p[0] << 56 ) |
+ ( (uint64_t) p[1] << 48 ) |
+ ( (uint64_t) p[2] << 40 ) |
+ ( (uint64_t) p[3] << 32 ) |
+ ( (uint64_t) p[4] << 24 ) |
+ ( (uint64_t) p[5] << 16 ) |
+ ( (uint64_t) p[6] << 8 ) |
+ ( (uint64_t) p[7] );
+ p += 8;
+#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( (size_t)( end - p ) < 1 )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ ssl->disable_datagram_packing = *p++;
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+ if( (size_t)( end - p ) < 8 )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ memcpy( ssl->cur_out_ctr, p, 8 );
+ p += 8;
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( (size_t)( end - p ) < 2 )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ ssl->mtu = ( p[0] << 8 ) | p[1];
+ p += 2;
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+#if defined(MBEDTLS_SSL_ALPN)
+ {
+ uint8_t alpn_len;
+ const char **cur;
+
+ if( (size_t)( end - p ) < 1 )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ alpn_len = *p++;
+
+ if( alpn_len != 0 && ssl->conf->alpn_list != NULL )
+ {
+ /* alpn_chosen should point to an item in the configured list */
+ for( cur = ssl->conf->alpn_list; *cur != NULL; cur++ )
+ {
+ if( strlen( *cur ) == alpn_len &&
+ memcmp( p, cur, alpn_len ) == 0 )
+ {
+ ssl->alpn_chosen = *cur;
+ break;
+ }
+ }
+ }
+
+ /* can only happen on conf mismatch */
+ if( alpn_len != 0 && ssl->alpn_chosen == NULL )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ p += alpn_len;
+ }
+#endif /* MBEDTLS_SSL_ALPN */
+
+ /*
+ * Forced fields from top-level ssl_context structure
+ *
+ * Most of them already set to the correct value by mbedtls_ssl_init() and
+ * mbedtls_ssl_reset(), so we only need to set the remaining ones.
+ */
+ ssl->state = MBEDTLS_SSL_HANDSHAKE_OVER;
+
+ ssl->major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
+ ssl->minor_ver = MBEDTLS_SSL_MINOR_VERSION_3;
+
+ /* Adjust pointers for header fields of outgoing records to
+ * the given transform, accounting for explicit IV and CID. */
+ mbedtls_ssl_update_out_pointers( ssl, ssl->transform );
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ ssl->in_epoch = 1;
+#endif
+
+ /* mbedtls_ssl_reset() leaves the handshake sub-structure allocated,
+ * which we don't want - otherwise we'd end up freeing the wrong transform
+ * by calling mbedtls_ssl_handshake_wrapup_free_hs_transform()
+ * inappropriately. */
+ if( ssl->handshake != NULL )
+ {
+ mbedtls_ssl_handshake_free( ssl );
+ mbedtls_free( ssl->handshake );
+ ssl->handshake = NULL;
+ }
+
+ /*
+ * Done - should have consumed entire buffer
+ */
+ if( p != end )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ return( 0 );
+}
+
+/*
+ * Deserialize context: public wrapper for error cleaning
+ */
+int mbedtls_ssl_context_load( mbedtls_ssl_context *context,
+ const unsigned char *buf,
+ size_t len )
+{
+ int ret = ssl_context_load( context, buf, len );
+
+ if( ret != 0 )
+ mbedtls_ssl_free( context );
+
+ return( ret );
+}
+#endif /* MBEDTLS_SSL_CONTEXT_SERIALIZATION */
+
+/*
+ * Free an SSL context
+ */
+void mbedtls_ssl_free( mbedtls_ssl_context *ssl )
+{
+ if( ssl == NULL )
+ return;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> free" ) );
+
+ if( ssl->out_buf != NULL )
+ {
+#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
+ size_t out_buf_len = ssl->out_buf_len;
+#else
+ size_t out_buf_len = MBEDTLS_SSL_OUT_BUFFER_LEN;
+#endif
+
+ mbedtls_platform_zeroize( ssl->out_buf, out_buf_len );
+ mbedtls_free( ssl->out_buf );
+ ssl->out_buf = NULL;
+ }
+
+ if( ssl->in_buf != NULL )
+ {
+#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
+ size_t in_buf_len = ssl->in_buf_len;
+#else
+ size_t in_buf_len = MBEDTLS_SSL_IN_BUFFER_LEN;
+#endif
+
+ mbedtls_platform_zeroize( ssl->in_buf, in_buf_len );
+ mbedtls_free( ssl->in_buf );
+ ssl->in_buf = NULL;
+ }
+
+#if defined(MBEDTLS_ZLIB_SUPPORT)
+ if( ssl->compress_buf != NULL )
+ {
+ mbedtls_platform_zeroize( ssl->compress_buf, MBEDTLS_SSL_COMPRESS_BUFFER_LEN );
+ mbedtls_free( ssl->compress_buf );
+ }
+#endif
+
+ if( ssl->transform )
+ {
+ mbedtls_ssl_transform_free( ssl->transform );
+ mbedtls_free( ssl->transform );
+ }
+
+ if( ssl->handshake )
+ {
+ mbedtls_ssl_handshake_free( ssl );
+ mbedtls_ssl_transform_free( ssl->transform_negotiate );
+ mbedtls_ssl_session_free( ssl->session_negotiate );
+
+ mbedtls_free( ssl->handshake );
+ mbedtls_free( ssl->transform_negotiate );
+ mbedtls_free( ssl->session_negotiate );
+ }
+
+ if( ssl->session )
+ {
+ mbedtls_ssl_session_free( ssl->session );
+ mbedtls_free( ssl->session );
+ }
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+ if( ssl->hostname != NULL )
+ {
+ mbedtls_platform_zeroize( ssl->hostname, strlen( ssl->hostname ) );
+ mbedtls_free( ssl->hostname );
+ }
+#endif
+
+#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
+ if( mbedtls_ssl_hw_record_finish != NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_finish()" ) );
+ mbedtls_ssl_hw_record_finish( ssl );
+ }
+#endif
+
+#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
+ mbedtls_free( ssl->cli_id );
+#endif
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= free" ) );
+
+ /* Actually clear after last debug message */
+ mbedtls_platform_zeroize( ssl, sizeof( mbedtls_ssl_context ) );
+}
+
+/*
+ * Initialze mbedtls_ssl_config
+ */
+void mbedtls_ssl_config_init( mbedtls_ssl_config *conf )
+{
+ memset( conf, 0, sizeof( mbedtls_ssl_config ) );
+}
+
+#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
+static int ssl_preset_default_hashes[] = {
+#if defined(MBEDTLS_SHA512_C)
+ MBEDTLS_MD_SHA512,
+#endif
+#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
+ MBEDTLS_MD_SHA384,
+#endif
+#if defined(MBEDTLS_SHA256_C)
+ MBEDTLS_MD_SHA256,
+ MBEDTLS_MD_SHA224,
+#endif
+#if defined(MBEDTLS_SHA1_C) && defined(MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_KEY_EXCHANGE)
+ MBEDTLS_MD_SHA1,
+#endif
+ MBEDTLS_MD_NONE
+};
+#endif
+
+static int ssl_preset_suiteb_ciphersuites[] = {
+ MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
+ MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
+ 0
+};
+
+#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
+static int ssl_preset_suiteb_hashes[] = {
+ MBEDTLS_MD_SHA256,
+ MBEDTLS_MD_SHA384,
+ MBEDTLS_MD_NONE
+};
+#endif
+
+#if defined(MBEDTLS_ECP_C)
+static mbedtls_ecp_group_id ssl_preset_suiteb_curves[] = {
+#if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED)
+ MBEDTLS_ECP_DP_SECP256R1,
+#endif
+#if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED)
+ MBEDTLS_ECP_DP_SECP384R1,
+#endif
+ MBEDTLS_ECP_DP_NONE
+};
+#endif
+
+/*
+ * Load default in mbedtls_ssl_config
+ */
+int mbedtls_ssl_config_defaults( mbedtls_ssl_config *conf,
+ int endpoint, int transport, int preset )
+{
+#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+#endif
+
+ /* Use the functions here so that they are covered in tests,
+ * but otherwise access member directly for efficiency */
+ mbedtls_ssl_conf_endpoint( conf, endpoint );
+ mbedtls_ssl_conf_transport( conf, transport );
+
+ /*
+ * Things that are common to all presets
+ */
+#if defined(MBEDTLS_SSL_CLI_C)
+ if( endpoint == MBEDTLS_SSL_IS_CLIENT )
+ {
+ conf->authmode = MBEDTLS_SSL_VERIFY_REQUIRED;
+#if defined(MBEDTLS_SSL_SESSION_TICKETS)
+ conf->session_tickets = MBEDTLS_SSL_SESSION_TICKETS_ENABLED;
+#endif
+ }
+#endif
+
+#if defined(MBEDTLS_ARC4_C)
+ conf->arc4_disabled = MBEDTLS_SSL_ARC4_DISABLED;
+#endif
+
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+ conf->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED;
+#endif
+
+#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
+ conf->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
+#endif
+
+#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
+ conf->cbc_record_splitting = MBEDTLS_SSL_CBC_RECORD_SPLITTING_ENABLED;
+#endif
+
+#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
+ conf->f_cookie_write = ssl_cookie_write_dummy;
+ conf->f_cookie_check = ssl_cookie_check_dummy;
+#endif
+
+#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
+ conf->anti_replay = MBEDTLS_SSL_ANTI_REPLAY_ENABLED;
+#endif
+
+#if defined(MBEDTLS_SSL_SRV_C)
+ conf->cert_req_ca_list = MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED;
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ conf->hs_timeout_min = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MIN;
+ conf->hs_timeout_max = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MAX;
+#endif
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+ conf->renego_max_records = MBEDTLS_SSL_RENEGO_MAX_RECORDS_DEFAULT;
+ memset( conf->renego_period, 0x00, 2 );
+ memset( conf->renego_period + 2, 0xFF, 6 );
+#endif
+
+#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
+ if( endpoint == MBEDTLS_SSL_IS_SERVER )
+ {
+ const unsigned char dhm_p[] =
+ MBEDTLS_DHM_RFC3526_MODP_2048_P_BIN;
+ const unsigned char dhm_g[] =
+ MBEDTLS_DHM_RFC3526_MODP_2048_G_BIN;
+
+ if ( ( ret = mbedtls_ssl_conf_dh_param_bin( conf,
+ dhm_p, sizeof( dhm_p ),
+ dhm_g, sizeof( dhm_g ) ) ) != 0 )
+ {
+ return( ret );
+ }
+ }
+#endif
+
+ /*
+ * Preset-specific defaults
+ */
+ switch( preset )
+ {
+ /*
+ * NSA Suite B
+ */
+ case MBEDTLS_SSL_PRESET_SUITEB:
+ conf->min_major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
+ conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_3; /* TLS 1.2 */
+ conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION;
+ conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION;
+
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] =
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] =
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] =
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] =
+ ssl_preset_suiteb_ciphersuites;
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+ conf->cert_profile = &mbedtls_x509_crt_profile_suiteb;
+#endif
+
+#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
+ conf->sig_hashes = ssl_preset_suiteb_hashes;
+#endif
+
+#if defined(MBEDTLS_ECP_C)
+ conf->curve_list = ssl_preset_suiteb_curves;
+#endif
+ break;
+
+ /*
+ * Default
+ */
+ default:
+ conf->min_major_ver = ( MBEDTLS_SSL_MIN_MAJOR_VERSION >
+ MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION ) ?
+ MBEDTLS_SSL_MIN_MAJOR_VERSION :
+ MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION;
+ conf->min_minor_ver = ( MBEDTLS_SSL_MIN_MINOR_VERSION >
+ MBEDTLS_SSL_MIN_VALID_MINOR_VERSION ) ?
+ MBEDTLS_SSL_MIN_MINOR_VERSION :
+ MBEDTLS_SSL_MIN_VALID_MINOR_VERSION;
+ conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION;
+ conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION;
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_2;
+#endif
+
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] =
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] =
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] =
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] =
+ mbedtls_ssl_list_ciphersuites();
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+ conf->cert_profile = &mbedtls_x509_crt_profile_default;
+#endif
+
+#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
+ conf->sig_hashes = ssl_preset_default_hashes;
+#endif
+
+#if defined(MBEDTLS_ECP_C)
+ conf->curve_list = mbedtls_ecp_grp_id_list();
+#endif
+
+#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
+ conf->dhm_min_bitlen = 1024;
+#endif
+ }
+
+ return( 0 );
+}
+
+/*
+ * Free mbedtls_ssl_config
+ */
+void mbedtls_ssl_config_free( mbedtls_ssl_config *conf )
+{
+#if defined(MBEDTLS_DHM_C)
+ mbedtls_mpi_free( &conf->dhm_P );
+ mbedtls_mpi_free( &conf->dhm_G );
+#endif
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
+ if( conf->psk != NULL )
+ {
+ mbedtls_platform_zeroize( conf->psk, conf->psk_len );
+ mbedtls_free( conf->psk );
+ conf->psk = NULL;
+ conf->psk_len = 0;
+ }
+
+ if( conf->psk_identity != NULL )
+ {
+ mbedtls_platform_zeroize( conf->psk_identity, conf->psk_identity_len );
+ mbedtls_free( conf->psk_identity );
+ conf->psk_identity = NULL;
+ conf->psk_identity_len = 0;
+ }
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+ ssl_key_cert_free( conf->key_cert );
+#endif
+
+ mbedtls_platform_zeroize( conf, sizeof( mbedtls_ssl_config ) );
+}
+
+#if defined(MBEDTLS_PK_C) && \
+ ( defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECDSA_C) )
+/*
+ * Convert between MBEDTLS_PK_XXX and SSL_SIG_XXX
+ */
+unsigned char mbedtls_ssl_sig_from_pk( mbedtls_pk_context *pk )
+{
+#if defined(MBEDTLS_RSA_C)
+ if( mbedtls_pk_can_do( pk, MBEDTLS_PK_RSA ) )
+ return( MBEDTLS_SSL_SIG_RSA );
+#endif
+#if defined(MBEDTLS_ECDSA_C)
+ if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECDSA ) )
+ return( MBEDTLS_SSL_SIG_ECDSA );
+#endif
+ return( MBEDTLS_SSL_SIG_ANON );
+}
+
+unsigned char mbedtls_ssl_sig_from_pk_alg( mbedtls_pk_type_t type )
+{
+ switch( type ) {
+ case MBEDTLS_PK_RSA:
+ return( MBEDTLS_SSL_SIG_RSA );
+ case MBEDTLS_PK_ECDSA:
+ case MBEDTLS_PK_ECKEY:
+ return( MBEDTLS_SSL_SIG_ECDSA );
+ default:
+ return( MBEDTLS_SSL_SIG_ANON );
+ }
+}
+
+mbedtls_pk_type_t mbedtls_ssl_pk_alg_from_sig( unsigned char sig )
+{
+ switch( sig )
+ {
+#if defined(MBEDTLS_RSA_C)
+ case MBEDTLS_SSL_SIG_RSA:
+ return( MBEDTLS_PK_RSA );
+#endif
+#if defined(MBEDTLS_ECDSA_C)
+ case MBEDTLS_SSL_SIG_ECDSA:
+ return( MBEDTLS_PK_ECDSA );
+#endif
+ default:
+ return( MBEDTLS_PK_NONE );
+ }
+}
+#endif /* MBEDTLS_PK_C && ( MBEDTLS_RSA_C || MBEDTLS_ECDSA_C ) */
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
+ defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
+
+/* Find an entry in a signature-hash set matching a given hash algorithm. */
+mbedtls_md_type_t mbedtls_ssl_sig_hash_set_find( mbedtls_ssl_sig_hash_set_t *set,
+ mbedtls_pk_type_t sig_alg )
+{
+ switch( sig_alg )
+ {
+ case MBEDTLS_PK_RSA:
+ return( set->rsa );
+ case MBEDTLS_PK_ECDSA:
+ return( set->ecdsa );
+ default:
+ return( MBEDTLS_MD_NONE );
+ }
+}
+
+/* Add a signature-hash-pair to a signature-hash set */
+void mbedtls_ssl_sig_hash_set_add( mbedtls_ssl_sig_hash_set_t *set,
+ mbedtls_pk_type_t sig_alg,
+ mbedtls_md_type_t md_alg )
+{
+ switch( sig_alg )
+ {
+ case MBEDTLS_PK_RSA:
+ if( set->rsa == MBEDTLS_MD_NONE )
+ set->rsa = md_alg;
+ break;
+
+ case MBEDTLS_PK_ECDSA:
+ if( set->ecdsa == MBEDTLS_MD_NONE )
+ set->ecdsa = md_alg;
+ break;
+
+ default:
+ break;
+ }
+}
+
+/* Allow exactly one hash algorithm for each signature. */
+void mbedtls_ssl_sig_hash_set_const_hash( mbedtls_ssl_sig_hash_set_t *set,
+ mbedtls_md_type_t md_alg )
+{
+ set->rsa = md_alg;
+ set->ecdsa = md_alg;
+}
+
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2) &&
+ MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
+
+/*
+ * Convert from MBEDTLS_SSL_HASH_XXX to MBEDTLS_MD_XXX
+ */
+mbedtls_md_type_t mbedtls_ssl_md_alg_from_hash( unsigned char hash )
+{
+ switch( hash )
+ {
+#if defined(MBEDTLS_MD5_C)
+ case MBEDTLS_SSL_HASH_MD5:
+ return( MBEDTLS_MD_MD5 );
+#endif
+#if defined(MBEDTLS_SHA1_C)
+ case MBEDTLS_SSL_HASH_SHA1:
+ return( MBEDTLS_MD_SHA1 );
+#endif
+#if defined(MBEDTLS_SHA256_C)
+ case MBEDTLS_SSL_HASH_SHA224:
+ return( MBEDTLS_MD_SHA224 );
+ case MBEDTLS_SSL_HASH_SHA256:
+ return( MBEDTLS_MD_SHA256 );
+#endif
+#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
+ case MBEDTLS_SSL_HASH_SHA384:
+ return( MBEDTLS_MD_SHA384 );
+#endif
+#if defined(MBEDTLS_SHA512_C)
+ case MBEDTLS_SSL_HASH_SHA512:
+ return( MBEDTLS_MD_SHA512 );
+#endif
+ default:
+ return( MBEDTLS_MD_NONE );
+ }
+}
+
+/*
+ * Convert from MBEDTLS_MD_XXX to MBEDTLS_SSL_HASH_XXX
+ */
+unsigned char mbedtls_ssl_hash_from_md_alg( int md )
+{
+ switch( md )
+ {
+#if defined(MBEDTLS_MD5_C)
+ case MBEDTLS_MD_MD5:
+ return( MBEDTLS_SSL_HASH_MD5 );
+#endif
+#if defined(MBEDTLS_SHA1_C)
+ case MBEDTLS_MD_SHA1:
+ return( MBEDTLS_SSL_HASH_SHA1 );
+#endif
+#if defined(MBEDTLS_SHA256_C)
+ case MBEDTLS_MD_SHA224:
+ return( MBEDTLS_SSL_HASH_SHA224 );
+ case MBEDTLS_MD_SHA256:
+ return( MBEDTLS_SSL_HASH_SHA256 );
+#endif
+#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
+ case MBEDTLS_MD_SHA384:
+ return( MBEDTLS_SSL_HASH_SHA384 );
+#endif
+#if defined(MBEDTLS_SHA512_C)
+ case MBEDTLS_MD_SHA512:
+ return( MBEDTLS_SSL_HASH_SHA512 );
+#endif
+ default:
+ return( MBEDTLS_SSL_HASH_NONE );
+ }
+}
+
+#if defined(MBEDTLS_ECP_C)
+/*
+ * Check if a curve proposed by the peer is in our list.
+ * Return 0 if we're willing to use it, -1 otherwise.
+ */
+int mbedtls_ssl_check_curve( const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id )
+{
+ const mbedtls_ecp_group_id *gid;
+
+ if( ssl->conf->curve_list == NULL )
+ return( -1 );
+
+ for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ )
+ if( *gid == grp_id )
+ return( 0 );
+
+ return( -1 );
+}
+#endif /* MBEDTLS_ECP_C */
+
+#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
+/*
+ * Check if a hash proposed by the peer is in our list.
+ * Return 0 if we're willing to use it, -1 otherwise.
+ */
+int mbedtls_ssl_check_sig_hash( const mbedtls_ssl_context *ssl,
+ mbedtls_md_type_t md )
+{
+ const int *cur;
+
+ if( ssl->conf->sig_hashes == NULL )
+ return( -1 );
+
+ for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ )
+ if( *cur == (int) md )
+ return( 0 );
+
+ return( -1 );
+}
+#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+int mbedtls_ssl_check_cert_usage( const mbedtls_x509_crt *cert,
+ const mbedtls_ssl_ciphersuite_t *ciphersuite,
+ int cert_endpoint,
+ uint32_t *flags )
+{
+ int ret = 0;
+#if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
+ int usage = 0;
+#endif
+#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
+ const char *ext_oid;
+ size_t ext_len;
+#endif
+
+#if !defined(MBEDTLS_X509_CHECK_KEY_USAGE) && \
+ !defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
+ ((void) cert);
+ ((void) cert_endpoint);
+ ((void) flags);
+#endif
+
+#if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
+ if( cert_endpoint == MBEDTLS_SSL_IS_SERVER )
+ {
+ /* Server part of the key exchange */
+ switch( ciphersuite->key_exchange )
+ {
+ case MBEDTLS_KEY_EXCHANGE_RSA:
+ case MBEDTLS_KEY_EXCHANGE_RSA_PSK:
+ usage = MBEDTLS_X509_KU_KEY_ENCIPHERMENT;
+ break;
+
+ case MBEDTLS_KEY_EXCHANGE_DHE_RSA:
+ case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA:
+ case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA:
+ usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
+ break;
+
+ case MBEDTLS_KEY_EXCHANGE_ECDH_RSA:
+ case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA:
+ usage = MBEDTLS_X509_KU_KEY_AGREEMENT;
+ break;
+
+ /* Don't use default: we want warnings when adding new values */
+ case MBEDTLS_KEY_EXCHANGE_NONE:
+ case MBEDTLS_KEY_EXCHANGE_PSK:
+ case MBEDTLS_KEY_EXCHANGE_DHE_PSK:
+ case MBEDTLS_KEY_EXCHANGE_ECDHE_PSK:
+ case MBEDTLS_KEY_EXCHANGE_ECJPAKE:
+ usage = 0;
+ }
+ }
+ else
+ {
+ /* Client auth: we only implement rsa_sign and mbedtls_ecdsa_sign for now */
+ usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
+ }
+
+ if( mbedtls_x509_crt_check_key_usage( cert, usage ) != 0 )
+ {
+ *flags |= MBEDTLS_X509_BADCERT_KEY_USAGE;
+ ret = -1;
+ }
+#else
+ ((void) ciphersuite);
+#endif /* MBEDTLS_X509_CHECK_KEY_USAGE */
+
+#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
+ if( cert_endpoint == MBEDTLS_SSL_IS_SERVER )
+ {
+ ext_oid = MBEDTLS_OID_SERVER_AUTH;
+ ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_SERVER_AUTH );
+ }
+ else
+ {
+ ext_oid = MBEDTLS_OID_CLIENT_AUTH;
+ ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_CLIENT_AUTH );
+ }
+
+ if( mbedtls_x509_crt_check_extended_key_usage( cert, ext_oid, ext_len ) != 0 )
+ {
+ *flags |= MBEDTLS_X509_BADCERT_EXT_KEY_USAGE;
+ ret = -1;
+ }
+#endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */
+
+ return( ret );
+}
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+int mbedtls_ssl_set_calc_verify_md( mbedtls_ssl_context *ssl, int md )
+{
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
+ return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
+
+ switch( md )
+ {
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
+#if defined(MBEDTLS_MD5_C)
+ case MBEDTLS_SSL_HASH_MD5:
+ return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
+#endif
+#if defined(MBEDTLS_SHA1_C)
+ case MBEDTLS_SSL_HASH_SHA1:
+ ssl->handshake->calc_verify = ssl_calc_verify_tls;
+ break;
+#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
+#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
+ case MBEDTLS_SSL_HASH_SHA384:
+ ssl->handshake->calc_verify = ssl_calc_verify_tls_sha384;
+ break;
+#endif
+#if defined(MBEDTLS_SHA256_C)
+ case MBEDTLS_SSL_HASH_SHA256:
+ ssl->handshake->calc_verify = ssl_calc_verify_tls_sha256;
+ break;
+#endif
+ default:
+ return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
+ }
+
+ return 0;
+#else /* !MBEDTLS_SSL_PROTO_TLS1_2 */
+ (void) ssl;
+ (void) md;
+
+ return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+}
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_1)
+int mbedtls_ssl_get_key_exchange_md_ssl_tls( mbedtls_ssl_context *ssl,
+ unsigned char *output,
+ unsigned char *data, size_t data_len )
+{
+ int ret = 0;
+ mbedtls_md5_context mbedtls_md5;
+ mbedtls_sha1_context mbedtls_sha1;
+
+ mbedtls_md5_init( &mbedtls_md5 );
+ mbedtls_sha1_init( &mbedtls_sha1 );
+
+ /*
+ * digitally-signed struct {
+ * opaque md5_hash[16];
+ * opaque sha_hash[20];
+ * };
+ *
+ * md5_hash
+ * MD5(ClientHello.random + ServerHello.random
+ * + ServerParams);
+ * sha_hash
+ * SHA(ClientHello.random + ServerHello.random
+ * + ServerParams);
+ */
+ if( ( ret = mbedtls_md5_starts_ret( &mbedtls_md5 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_starts_ret", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_md5_update_ret( &mbedtls_md5,
+ ssl->handshake->randbytes, 64 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_update_ret", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_md5_update_ret( &mbedtls_md5, data, data_len ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_update_ret", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_md5_finish_ret( &mbedtls_md5, output ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_finish_ret", ret );
+ goto exit;
+ }
+
+ if( ( ret = mbedtls_sha1_starts_ret( &mbedtls_sha1 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_starts_ret", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_sha1_update_ret( &mbedtls_sha1,
+ ssl->handshake->randbytes, 64 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_update_ret", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_sha1_update_ret( &mbedtls_sha1, data,
+ data_len ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_update_ret", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_sha1_finish_ret( &mbedtls_sha1,
+ output + 16 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_finish_ret", ret );
+ goto exit;
+ }
+
+exit:
+ mbedtls_md5_free( &mbedtls_md5 );
+ mbedtls_sha1_free( &mbedtls_sha1 );
+
+ if( ret != 0 )
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
+
+ return( ret );
+
+}
+#endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \
+ MBEDTLS_SSL_PROTO_TLS1_1 */
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_2)
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+int mbedtls_ssl_get_key_exchange_md_tls1_2( mbedtls_ssl_context *ssl,
+ unsigned char *hash, size_t *hashlen,
+ unsigned char *data, size_t data_len,
+ mbedtls_md_type_t md_alg )
+{
+ psa_status_t status;
+ psa_hash_operation_t hash_operation = PSA_HASH_OPERATION_INIT;
+ psa_algorithm_t hash_alg = mbedtls_psa_translate_md( md_alg );
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Perform PSA-based computation of digest of ServerKeyExchange" ) );
+
+ if( ( status = psa_hash_setup( &hash_operation,
+ hash_alg ) ) != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "psa_hash_setup", status );
+ goto exit;
+ }
+
+ if( ( status = psa_hash_update( &hash_operation, ssl->handshake->randbytes,
+ 64 ) ) != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "psa_hash_update", status );
+ goto exit;
+ }
+
+ if( ( status = psa_hash_update( &hash_operation,
+ data, data_len ) ) != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "psa_hash_update", status );
+ goto exit;
+ }
+
+ if( ( status = psa_hash_finish( &hash_operation, hash, MBEDTLS_MD_MAX_SIZE,
+ hashlen ) ) != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "psa_hash_finish", status );
+ goto exit;
+ }
+
+exit:
+ if( status != PSA_SUCCESS )
+ {
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
+ switch( status )
+ {
+ case PSA_ERROR_NOT_SUPPORTED:
+ return( MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE );
+ case PSA_ERROR_BAD_STATE: /* Intentional fallthrough */
+ case PSA_ERROR_BUFFER_TOO_SMALL:
+ return( MBEDTLS_ERR_MD_BAD_INPUT_DATA );
+ case PSA_ERROR_INSUFFICIENT_MEMORY:
+ return( MBEDTLS_ERR_MD_ALLOC_FAILED );
+ default:
+ return( MBEDTLS_ERR_MD_HW_ACCEL_FAILED );
+ }
+ }
+ return( 0 );
+}
+
+#else
+
+int mbedtls_ssl_get_key_exchange_md_tls1_2( mbedtls_ssl_context *ssl,
+ unsigned char *hash, size_t *hashlen,
+ unsigned char *data, size_t data_len,
+ mbedtls_md_type_t md_alg )
+{
+ int ret = 0;
+ mbedtls_md_context_t ctx;
+ const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( md_alg );
+ *hashlen = mbedtls_md_get_size( md_info );
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Perform mbedtls-based computation of digest of ServerKeyExchange" ) );
+
+ mbedtls_md_init( &ctx );
+
+ /*
+ * digitally-signed struct {
+ * opaque client_random[32];
+ * opaque server_random[32];
+ * ServerDHParams params;
+ * };
+ */
+ if( ( ret = mbedtls_md_setup( &ctx, md_info, 0 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_md_starts( &ctx ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_starts", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_md_update( &ctx, ssl->handshake->randbytes, 64 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_update", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_md_update( &ctx, data, data_len ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_update", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_md_finish( &ctx, hash ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_finish", ret );
+ goto exit;
+ }
+
+exit:
+ mbedtls_md_free( &ctx );
+
+ if( ret != 0 )
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
+
+ return( ret );
+}
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
+#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
+ MBEDTLS_SSL_PROTO_TLS1_2 */
+
+#endif /* MBEDTLS_SSL_TLS_C */
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