diff options
Diffstat (limited to 'lib/mbedtls-2.27.0/library/x509write_crt.c')
| -rw-r--r-- | lib/mbedtls-2.27.0/library/x509write_crt.c | 544 |
1 files changed, 544 insertions, 0 deletions
diff --git a/lib/mbedtls-2.27.0/library/x509write_crt.c b/lib/mbedtls-2.27.0/library/x509write_crt.c new file mode 100644 index 0000000..8f4a4f5 --- /dev/null +++ b/lib/mbedtls-2.27.0/library/x509write_crt.c @@ -0,0 +1,544 @@ +/* + * X.509 certificate writing + * + * 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. + */ +/* + * References: + * - certificates: RFC 5280, updated by RFC 6818 + * - CSRs: PKCS#10 v1.7 aka RFC 2986 + * - attributes: PKCS#9 v2.0 aka RFC 2985 + */ + +#include "common.h" + +#if defined(MBEDTLS_X509_CRT_WRITE_C) + +#include "mbedtls/x509_crt.h" +#include "mbedtls/asn1write.h" +#include "mbedtls/error.h" +#include "mbedtls/oid.h" +#include "mbedtls/platform_util.h" +#include "mbedtls/sha1.h" + +#include <string.h> + +#if defined(MBEDTLS_PEM_WRITE_C) +#include "mbedtls/pem.h" +#endif /* MBEDTLS_PEM_WRITE_C */ + +void mbedtls_x509write_crt_init( mbedtls_x509write_cert *ctx ) +{ + memset( ctx, 0, sizeof( mbedtls_x509write_cert ) ); + + mbedtls_mpi_init( &ctx->serial ); + ctx->version = MBEDTLS_X509_CRT_VERSION_3; +} + +void mbedtls_x509write_crt_free( mbedtls_x509write_cert *ctx ) +{ + mbedtls_mpi_free( &ctx->serial ); + + mbedtls_asn1_free_named_data_list( &ctx->subject ); + mbedtls_asn1_free_named_data_list( &ctx->issuer ); + mbedtls_asn1_free_named_data_list( &ctx->extensions ); + + mbedtls_platform_zeroize( ctx, sizeof( mbedtls_x509write_cert ) ); +} + +void mbedtls_x509write_crt_set_version( mbedtls_x509write_cert *ctx, + int version ) +{ + ctx->version = version; +} + +void mbedtls_x509write_crt_set_md_alg( mbedtls_x509write_cert *ctx, + mbedtls_md_type_t md_alg ) +{ + ctx->md_alg = md_alg; +} + +void mbedtls_x509write_crt_set_subject_key( mbedtls_x509write_cert *ctx, + mbedtls_pk_context *key ) +{ + ctx->subject_key = key; +} + +void mbedtls_x509write_crt_set_issuer_key( mbedtls_x509write_cert *ctx, + mbedtls_pk_context *key ) +{ + ctx->issuer_key = key; +} + +int mbedtls_x509write_crt_set_subject_name( mbedtls_x509write_cert *ctx, + const char *subject_name ) +{ + return mbedtls_x509_string_to_names( &ctx->subject, subject_name ); +} + +int mbedtls_x509write_crt_set_issuer_name( mbedtls_x509write_cert *ctx, + const char *issuer_name ) +{ + return mbedtls_x509_string_to_names( &ctx->issuer, issuer_name ); +} + +int mbedtls_x509write_crt_set_serial( mbedtls_x509write_cert *ctx, + const mbedtls_mpi *serial ) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + + if( ( ret = mbedtls_mpi_copy( &ctx->serial, serial ) ) != 0 ) + return( ret ); + + return( 0 ); +} + +int mbedtls_x509write_crt_set_validity( mbedtls_x509write_cert *ctx, + const char *not_before, + const char *not_after ) +{ + if( strlen( not_before ) != MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1 || + strlen( not_after ) != MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1 ) + { + return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); + } + strncpy( ctx->not_before, not_before, MBEDTLS_X509_RFC5280_UTC_TIME_LEN ); + strncpy( ctx->not_after , not_after , MBEDTLS_X509_RFC5280_UTC_TIME_LEN ); + ctx->not_before[MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1] = 'Z'; + ctx->not_after[MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1] = 'Z'; + + return( 0 ); +} + +int mbedtls_x509write_crt_set_extension( mbedtls_x509write_cert *ctx, + const char *oid, size_t oid_len, + int critical, + const unsigned char *val, size_t val_len ) +{ + return( mbedtls_x509_set_extension( &ctx->extensions, oid, oid_len, + critical, val, val_len ) ); +} + +int mbedtls_x509write_crt_set_basic_constraints( mbedtls_x509write_cert *ctx, + int is_ca, int max_pathlen ) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + unsigned char buf[9]; + unsigned char *c = buf + sizeof(buf); + size_t len = 0; + + memset( buf, 0, sizeof(buf) ); + + if( is_ca && max_pathlen > 127 ) + return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); + + if( is_ca ) + { + if( max_pathlen >= 0 ) + { + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, + max_pathlen ) ); + } + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_bool( &c, buf, 1 ) ); + } + + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) ); + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, + MBEDTLS_ASN1_CONSTRUCTED | + MBEDTLS_ASN1_SEQUENCE ) ); + + return( + mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_BASIC_CONSTRAINTS, + MBEDTLS_OID_SIZE( MBEDTLS_OID_BASIC_CONSTRAINTS ), + is_ca, buf + sizeof(buf) - len, len ) ); +} + +#if defined(MBEDTLS_SHA1_C) +int mbedtls_x509write_crt_set_subject_key_identifier( mbedtls_x509write_cert *ctx ) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + unsigned char buf[MBEDTLS_MPI_MAX_SIZE * 2 + 20]; /* tag, length + 2xMPI */ + unsigned char *c = buf + sizeof(buf); + size_t len = 0; + + memset( buf, 0, sizeof(buf) ); + MBEDTLS_ASN1_CHK_ADD( len, + mbedtls_pk_write_pubkey( &c, buf, ctx->subject_key ) ); + + ret = mbedtls_sha1_ret( buf + sizeof( buf ) - len, len, + buf + sizeof( buf ) - 20 ); + if( ret != 0 ) + return( ret ); + c = buf + sizeof( buf ) - 20; + len = 20; + + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) ); + MBEDTLS_ASN1_CHK_ADD( len, + mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_OCTET_STRING ) ); + + return mbedtls_x509write_crt_set_extension( ctx, + MBEDTLS_OID_SUBJECT_KEY_IDENTIFIER, + MBEDTLS_OID_SIZE( MBEDTLS_OID_SUBJECT_KEY_IDENTIFIER ), + 0, buf + sizeof(buf) - len, len ); +} + +int mbedtls_x509write_crt_set_authority_key_identifier( mbedtls_x509write_cert *ctx ) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + unsigned char buf[MBEDTLS_MPI_MAX_SIZE * 2 + 20]; /* tag, length + 2xMPI */ + unsigned char *c = buf + sizeof( buf ); + size_t len = 0; + + memset( buf, 0, sizeof(buf) ); + MBEDTLS_ASN1_CHK_ADD( len, + mbedtls_pk_write_pubkey( &c, buf, ctx->issuer_key ) ); + + ret = mbedtls_sha1_ret( buf + sizeof( buf ) - len, len, + buf + sizeof( buf ) - 20 ); + if( ret != 0 ) + return( ret ); + c = buf + sizeof( buf ) - 20; + len = 20; + + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) ); + MBEDTLS_ASN1_CHK_ADD( len, + mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONTEXT_SPECIFIC | 0 ) ); + + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) ); + MBEDTLS_ASN1_CHK_ADD( len, + mbedtls_asn1_write_tag( &c, buf, + MBEDTLS_ASN1_CONSTRUCTED | + MBEDTLS_ASN1_SEQUENCE ) ); + + return mbedtls_x509write_crt_set_extension( + ctx, MBEDTLS_OID_AUTHORITY_KEY_IDENTIFIER, + MBEDTLS_OID_SIZE( MBEDTLS_OID_AUTHORITY_KEY_IDENTIFIER ), + 0, buf + sizeof( buf ) - len, len ); +} +#endif /* MBEDTLS_SHA1_C */ + +int mbedtls_x509write_crt_set_key_usage( mbedtls_x509write_cert *ctx, + unsigned int key_usage ) +{ + unsigned char buf[5] = {0}, ku[2] = {0}; + unsigned char *c; + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + const unsigned int allowed_bits = MBEDTLS_X509_KU_DIGITAL_SIGNATURE | + MBEDTLS_X509_KU_NON_REPUDIATION | + MBEDTLS_X509_KU_KEY_ENCIPHERMENT | + MBEDTLS_X509_KU_DATA_ENCIPHERMENT | + MBEDTLS_X509_KU_KEY_AGREEMENT | + MBEDTLS_X509_KU_KEY_CERT_SIGN | + MBEDTLS_X509_KU_CRL_SIGN | + MBEDTLS_X509_KU_ENCIPHER_ONLY | + MBEDTLS_X509_KU_DECIPHER_ONLY; + + /* Check that nothing other than the allowed flags is set */ + if( ( key_usage & ~allowed_bits ) != 0 ) + return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE ); + + c = buf + 5; + ku[0] = (unsigned char)( key_usage ); + ku[1] = (unsigned char)( key_usage >> 8 ); + ret = mbedtls_asn1_write_named_bitstring( &c, buf, ku, 9 ); + + if( ret < 0 ) + return( ret ); + else if( ret < 3 || ret > 5 ) + return( MBEDTLS_ERR_X509_INVALID_FORMAT ); + + ret = mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_KEY_USAGE, + MBEDTLS_OID_SIZE( MBEDTLS_OID_KEY_USAGE ), + 1, c, (size_t)ret ); + if( ret != 0 ) + return( ret ); + + return( 0 ); +} + +int mbedtls_x509write_crt_set_ns_cert_type( mbedtls_x509write_cert *ctx, + unsigned char ns_cert_type ) +{ + unsigned char buf[4] = {0}; + unsigned char *c; + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + + c = buf + 4; + + ret = mbedtls_asn1_write_named_bitstring( &c, buf, &ns_cert_type, 8 ); + if( ret < 3 || ret > 4 ) + return( ret ); + + ret = mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_NS_CERT_TYPE, + MBEDTLS_OID_SIZE( MBEDTLS_OID_NS_CERT_TYPE ), + 0, c, (size_t)ret ); + if( ret != 0 ) + return( ret ); + + return( 0 ); +} + +static int x509_write_time( unsigned char **p, unsigned char *start, + const char *t, size_t size ) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + size_t len = 0; + + /* + * write MBEDTLS_ASN1_UTC_TIME if year < 2050 (2 bytes shorter) + */ + if( t[0] == '2' && t[1] == '0' && t[2] < '5' ) + { + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start, + (const unsigned char *) t + 2, + size - 2 ) ); + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) ); + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, + MBEDTLS_ASN1_UTC_TIME ) ); + } + else + { + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start, + (const unsigned char *) t, + size ) ); + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) ); + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, + MBEDTLS_ASN1_GENERALIZED_TIME ) ); + } + + return( (int) len ); +} + +int mbedtls_x509write_crt_der( mbedtls_x509write_cert *ctx, + unsigned char *buf, size_t size, + int (*f_rng)(void *, unsigned char *, size_t), + void *p_rng ) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + const char *sig_oid; + size_t sig_oid_len = 0; + unsigned char *c, *c2; + unsigned char hash[64]; + unsigned char sig[MBEDTLS_PK_SIGNATURE_MAX_SIZE]; + size_t sub_len = 0, pub_len = 0, sig_and_oid_len = 0, sig_len; + size_t len = 0; + mbedtls_pk_type_t pk_alg; + + /* + * Prepare data to be signed at the end of the target buffer + */ + c = buf + size; + + /* Signature algorithm needed in TBS, and later for actual signature */ + + /* There's no direct way of extracting a signature algorithm + * (represented as an element of mbedtls_pk_type_t) from a PK instance. */ + if( mbedtls_pk_can_do( ctx->issuer_key, MBEDTLS_PK_RSA ) ) + pk_alg = MBEDTLS_PK_RSA; + else if( mbedtls_pk_can_do( ctx->issuer_key, MBEDTLS_PK_ECDSA ) ) + pk_alg = MBEDTLS_PK_ECDSA; + else + return( MBEDTLS_ERR_X509_INVALID_ALG ); + + if( ( ret = mbedtls_oid_get_oid_by_sig_alg( pk_alg, ctx->md_alg, + &sig_oid, &sig_oid_len ) ) != 0 ) + { + return( ret ); + } + + /* + * Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension + */ + + /* Only for v3 */ + if( ctx->version == MBEDTLS_X509_CRT_VERSION_3 ) + { + MBEDTLS_ASN1_CHK_ADD( len, + mbedtls_x509_write_extensions( &c, + buf, ctx->extensions ) ); + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) ); + MBEDTLS_ASN1_CHK_ADD( len, + mbedtls_asn1_write_tag( &c, buf, + MBEDTLS_ASN1_CONSTRUCTED | + MBEDTLS_ASN1_SEQUENCE ) ); + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) ); + MBEDTLS_ASN1_CHK_ADD( len, + mbedtls_asn1_write_tag( &c, buf, + MBEDTLS_ASN1_CONTEXT_SPECIFIC | + MBEDTLS_ASN1_CONSTRUCTED | 3 ) ); + } + + /* + * SubjectPublicKeyInfo + */ + MBEDTLS_ASN1_CHK_ADD( pub_len, + mbedtls_pk_write_pubkey_der( ctx->subject_key, + buf, c - buf ) ); + c -= pub_len; + len += pub_len; + + /* + * Subject ::= Name + */ + MBEDTLS_ASN1_CHK_ADD( len, + mbedtls_x509_write_names( &c, buf, + ctx->subject ) ); + + /* + * Validity ::= SEQUENCE { + * notBefore Time, + * notAfter Time } + */ + sub_len = 0; + + MBEDTLS_ASN1_CHK_ADD( sub_len, + x509_write_time( &c, buf, ctx->not_after, + MBEDTLS_X509_RFC5280_UTC_TIME_LEN ) ); + + MBEDTLS_ASN1_CHK_ADD( sub_len, + x509_write_time( &c, buf, ctx->not_before, + MBEDTLS_X509_RFC5280_UTC_TIME_LEN ) ); + + len += sub_len; + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, sub_len ) ); + MBEDTLS_ASN1_CHK_ADD( len, + mbedtls_asn1_write_tag( &c, buf, + MBEDTLS_ASN1_CONSTRUCTED | + MBEDTLS_ASN1_SEQUENCE ) ); + + /* + * Issuer ::= Name + */ + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_names( &c, buf, + ctx->issuer ) ); + + /* + * Signature ::= AlgorithmIdentifier + */ + MBEDTLS_ASN1_CHK_ADD( len, + mbedtls_asn1_write_algorithm_identifier( &c, buf, + sig_oid, strlen( sig_oid ), 0 ) ); + + /* + * Serial ::= INTEGER + */ + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf, + &ctx->serial ) ); + + /* + * Version ::= INTEGER { v1(0), v2(1), v3(2) } + */ + + /* Can be omitted for v1 */ + if( ctx->version != MBEDTLS_X509_CRT_VERSION_1 ) + { + sub_len = 0; + MBEDTLS_ASN1_CHK_ADD( sub_len, + mbedtls_asn1_write_int( &c, buf, ctx->version ) ); + len += sub_len; + MBEDTLS_ASN1_CHK_ADD( len, + mbedtls_asn1_write_len( &c, buf, sub_len ) ); + MBEDTLS_ASN1_CHK_ADD( len, + mbedtls_asn1_write_tag( &c, buf, + MBEDTLS_ASN1_CONTEXT_SPECIFIC | + MBEDTLS_ASN1_CONSTRUCTED | 0 ) ); + } + + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) ); + MBEDTLS_ASN1_CHK_ADD( len, + mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED | + MBEDTLS_ASN1_SEQUENCE ) ); + + /* + * Make signature + */ + + /* Compute hash of CRT. */ + if( ( ret = mbedtls_md( mbedtls_md_info_from_type( ctx->md_alg ), c, + len, hash ) ) != 0 ) + { + return( ret ); + } + + if( ( ret = mbedtls_pk_sign( ctx->issuer_key, ctx->md_alg, + hash, 0, sig, &sig_len, + f_rng, p_rng ) ) != 0 ) + { + return( ret ); + } + + /* Move CRT to the front of the buffer to have space + * for the signature. */ + memmove( buf, c, len ); + c = buf + len; + + /* Add signature at the end of the buffer, + * making sure that it doesn't underflow + * into the CRT buffer. */ + c2 = buf + size; + MBEDTLS_ASN1_CHK_ADD( sig_and_oid_len, mbedtls_x509_write_sig( &c2, c, + sig_oid, sig_oid_len, sig, sig_len ) ); + + /* + * Memory layout after this step: + * + * buf c=buf+len c2 buf+size + * [CRT0,...,CRTn, UNUSED, ..., UNUSED, SIG0, ..., SIGm] + */ + + /* Move raw CRT to just before the signature. */ + c = c2 - len; + memmove( c, buf, len ); + + len += sig_and_oid_len; + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) ); + MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, + MBEDTLS_ASN1_CONSTRUCTED | + MBEDTLS_ASN1_SEQUENCE ) ); + + return( (int) len ); +} + +#define PEM_BEGIN_CRT "-----BEGIN CERTIFICATE-----\n" +#define PEM_END_CRT "-----END CERTIFICATE-----\n" + +#if defined(MBEDTLS_PEM_WRITE_C) +int mbedtls_x509write_crt_pem( mbedtls_x509write_cert *crt, + unsigned char *buf, size_t size, + int (*f_rng)(void *, unsigned char *, size_t), + void *p_rng ) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + size_t olen; + + if( ( ret = mbedtls_x509write_crt_der( crt, buf, size, + f_rng, p_rng ) ) < 0 ) + { + return( ret ); + } + + if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_CRT, PEM_END_CRT, + buf + size - ret, ret, + buf, size, &olen ) ) != 0 ) + { + return( ret ); + } + + return( 0 ); +} +#endif /* MBEDTLS_PEM_WRITE_C */ + +#endif /* MBEDTLS_X509_CRT_WRITE_C */ |