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const std = @import("std");
const Io = std.Io;
const assert = std.debug.assert;
const fs = std.fs;
const mem = std.mem;
const Allocator = std.mem.Allocator;
const Bundle = @import("../Bundle.zig");
pub const RescanMacError = Allocator.Error || fs.File.OpenError || fs.File.ReadError || fs.File.SeekError || Bundle.ParseCertError || error{EndOfStream};
pub fn rescanMac(cb: *Bundle, gpa: Allocator, io: Io, now: Io.Timestamp) RescanMacError!void {
cb.bytes.clearRetainingCapacity();
cb.map.clearRetainingCapacity();
const keychain_paths = [2][]const u8{
"/System/Library/Keychains/SystemRootCertificates.keychain",
"/Library/Keychains/System.keychain",
};
_ = io; // TODO migrate file system to use std.Io
for (keychain_paths) |keychain_path| {
const bytes = std.fs.cwd().readFileAlloc(keychain_path, gpa, .limited(std.math.maxInt(u32))) catch |err| switch (err) {
error.StreamTooLong => return error.FileTooBig,
else => |e| return e,
};
defer gpa.free(bytes);
var reader: Io.Reader = .fixed(bytes);
scanReader(cb, gpa, &reader, now.toSeconds()) catch |err| switch (err) {
error.ReadFailed => unreachable, // prebuffered
else => |e| return e,
};
}
cb.bytes.shrinkAndFree(gpa, cb.bytes.items.len);
}
fn scanReader(cb: *Bundle, gpa: Allocator, reader: *Io.Reader, now_sec: i64) !void {
const db_header = try reader.takeStruct(ApplDbHeader, .big);
assert(mem.eql(u8, &db_header.signature, "kych"));
reader.seek = db_header.schema_offset;
const db_schema = try reader.takeStruct(ApplDbSchema, .big);
var table_list = try gpa.alloc(u32, db_schema.table_count);
defer gpa.free(table_list);
var table_idx: u32 = 0;
while (table_idx < table_list.len) : (table_idx += 1) {
table_list[table_idx] = try reader.takeInt(u32, .big);
}
for (table_list) |table_offset| {
reader.seek = db_header.schema_offset + table_offset;
const table_header = try reader.takeStruct(TableHeader, .big);
if (@as(std.c.DB_RECORDTYPE, @enumFromInt(table_header.table_id)) != .X509_CERTIFICATE) {
continue;
}
var record_list = try gpa.alloc(u32, table_header.record_count);
defer gpa.free(record_list);
var record_idx: u32 = 0;
while (record_idx < record_list.len) : (record_idx += 1) {
record_list[record_idx] = try reader.takeInt(u32, .big);
}
for (record_list) |record_offset| {
// An offset of zero means that the record is not present.
// An offset that is not 4-byte-aligned is invalid.
if (record_offset == 0 or record_offset % 4 != 0) continue;
reader.seek = db_header.schema_offset + table_offset + record_offset;
const cert_header = try reader.takeStruct(X509CertHeader, .big);
if (cert_header.cert_size == 0) continue;
const cert_start: u32 = @intCast(cb.bytes.items.len);
const dest_buf = try cb.bytes.addManyAsSlice(gpa, cert_header.cert_size);
try reader.readSliceAll(dest_buf);
try cb.parseCert(gpa, cert_start, now_sec);
}
}
}
const ApplDbHeader = extern struct {
signature: [4]u8,
version: u32,
header_size: u32,
schema_offset: u32,
auth_offset: u32,
};
const ApplDbSchema = extern struct {
schema_size: u32,
table_count: u32,
};
const TableHeader = extern struct {
table_size: u32,
table_id: u32,
record_count: u32,
records: u32,
indexes_offset: u32,
free_list_head: u32,
record_numbers_count: u32,
};
const X509CertHeader = extern struct {
record_size: u32,
record_number: u32,
unknown1: u32,
unknown2: u32,
cert_size: u32,
unknown3: u32,
cert_type: u32,
cert_encoding: u32,
print_name: u32,
alias: u32,
subject: u32,
issuer: u32,
serial_number: u32,
subject_key_identifier: u32,
public_key_hash: u32,
};
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