mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2024-12-23 14:15:37 +00:00
1cd10adc7c
Allow for future support of decipherOnly and encipherOnly. Some work will be required to ensure we still write only one byte when only one is needed.
458 lines
16 KiB
C
458 lines
16 KiB
C
/*
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* X.509 certificate writing
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*
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* Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* References:
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* - certificates: RFC 5280, updated by RFC 6818
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* - CSRs: PKCS#10 v1.7 aka RFC 2986
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* - attributes: PKCS#9 v2.0 aka RFC 2985
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_X509_CRT_WRITE_C)
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#include "mbedtls/x509_crt.h"
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#include "mbedtls/oid.h"
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#include "mbedtls/asn1write.h"
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#include "mbedtls/sha1.h"
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#include <string.h>
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#if defined(MBEDTLS_PEM_WRITE_C)
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#include "mbedtls/pem.h"
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#endif /* MBEDTLS_PEM_WRITE_C */
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/* Implementation that should never be optimized out by the compiler */
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static void mbedtls_zeroize( void *v, size_t n ) {
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volatile unsigned char *p = v; while( n-- ) *p++ = 0;
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}
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void mbedtls_x509write_crt_init( mbedtls_x509write_cert *ctx )
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{
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memset( ctx, 0, sizeof(mbedtls_x509write_cert) );
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mbedtls_mpi_init( &ctx->serial );
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ctx->version = MBEDTLS_X509_CRT_VERSION_3;
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}
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void mbedtls_x509write_crt_free( mbedtls_x509write_cert *ctx )
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{
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mbedtls_mpi_free( &ctx->serial );
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mbedtls_asn1_free_named_data_list( &ctx->subject );
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mbedtls_asn1_free_named_data_list( &ctx->issuer );
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mbedtls_asn1_free_named_data_list( &ctx->extensions );
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mbedtls_zeroize( ctx, sizeof(mbedtls_x509write_cert) );
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}
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void mbedtls_x509write_crt_set_version( mbedtls_x509write_cert *ctx, int version )
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{
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ctx->version = version;
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}
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void mbedtls_x509write_crt_set_md_alg( mbedtls_x509write_cert *ctx, mbedtls_md_type_t md_alg )
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{
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ctx->md_alg = md_alg;
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}
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void mbedtls_x509write_crt_set_subject_key( mbedtls_x509write_cert *ctx, mbedtls_pk_context *key )
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{
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ctx->subject_key = key;
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}
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void mbedtls_x509write_crt_set_issuer_key( mbedtls_x509write_cert *ctx, mbedtls_pk_context *key )
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{
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ctx->issuer_key = key;
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}
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int mbedtls_x509write_crt_set_subject_name( mbedtls_x509write_cert *ctx,
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const char *subject_name )
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{
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return mbedtls_x509_string_to_names( &ctx->subject, subject_name );
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}
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int mbedtls_x509write_crt_set_issuer_name( mbedtls_x509write_cert *ctx,
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const char *issuer_name )
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{
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return mbedtls_x509_string_to_names( &ctx->issuer, issuer_name );
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}
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int mbedtls_x509write_crt_set_serial( mbedtls_x509write_cert *ctx, const mbedtls_mpi *serial )
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{
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int ret;
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if( ( ret = mbedtls_mpi_copy( &ctx->serial, serial ) ) != 0 )
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return( ret );
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return( 0 );
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}
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int mbedtls_x509write_crt_set_validity( mbedtls_x509write_cert *ctx, const char *not_before,
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const char *not_after )
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{
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if( strlen( not_before ) != MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1 ||
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strlen( not_after ) != MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1 )
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{
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return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
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}
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strncpy( ctx->not_before, not_before, MBEDTLS_X509_RFC5280_UTC_TIME_LEN );
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strncpy( ctx->not_after , not_after , MBEDTLS_X509_RFC5280_UTC_TIME_LEN );
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ctx->not_before[MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1] = 'Z';
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ctx->not_after[MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1] = 'Z';
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return( 0 );
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}
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int mbedtls_x509write_crt_set_extension( mbedtls_x509write_cert *ctx,
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const char *oid, size_t oid_len,
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int critical,
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const unsigned char *val, size_t val_len )
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{
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return mbedtls_x509_set_extension( &ctx->extensions, oid, oid_len,
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critical, val, val_len );
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}
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int mbedtls_x509write_crt_set_basic_constraints( mbedtls_x509write_cert *ctx,
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int is_ca, int max_pathlen )
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{
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int ret;
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unsigned char buf[9];
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unsigned char *c = buf + sizeof(buf);
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size_t len = 0;
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memset( buf, 0, sizeof(buf) );
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if( is_ca && max_pathlen > 127 )
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return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
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if( is_ca )
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{
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if( max_pathlen >= 0 )
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{
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, max_pathlen ) );
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}
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_bool( &c, buf, 1 ) );
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}
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE ) );
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return mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_BASIC_CONSTRAINTS,
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MBEDTLS_OID_SIZE( MBEDTLS_OID_BASIC_CONSTRAINTS ),
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0, buf + sizeof(buf) - len, len );
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}
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#if defined(MBEDTLS_SHA1_C)
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int mbedtls_x509write_crt_set_subject_key_identifier( mbedtls_x509write_cert *ctx )
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{
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int ret;
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unsigned char buf[MBEDTLS_MPI_MAX_SIZE * 2 + 20]; /* tag, length + 2xMPI */
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unsigned char *c = buf + sizeof(buf);
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size_t len = 0;
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memset( buf, 0, sizeof(buf) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, ctx->subject_key ) );
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mbedtls_sha1( buf + sizeof(buf) - len, len, buf + sizeof(buf) - 20 );
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c = buf + sizeof(buf) - 20;
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len = 20;
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_OCTET_STRING ) );
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return mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_SUBJECT_KEY_IDENTIFIER,
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MBEDTLS_OID_SIZE( MBEDTLS_OID_SUBJECT_KEY_IDENTIFIER ),
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0, buf + sizeof(buf) - len, len );
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}
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int mbedtls_x509write_crt_set_authority_key_identifier( mbedtls_x509write_cert *ctx )
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{
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int ret;
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unsigned char buf[MBEDTLS_MPI_MAX_SIZE * 2 + 20]; /* tag, length + 2xMPI */
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unsigned char *c = buf + sizeof(buf);
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size_t len = 0;
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memset( buf, 0, sizeof(buf) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, ctx->issuer_key ) );
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mbedtls_sha1( buf + sizeof(buf) - len, len, buf + sizeof(buf) - 20 );
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c = buf + sizeof(buf) - 20;
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len = 20;
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONTEXT_SPECIFIC | 0 ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE ) );
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return mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_AUTHORITY_KEY_IDENTIFIER,
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MBEDTLS_OID_SIZE( MBEDTLS_OID_AUTHORITY_KEY_IDENTIFIER ),
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0, buf + sizeof(buf) - len, len );
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}
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#endif /* MBEDTLS_SHA1_C */
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int mbedtls_x509write_crt_set_key_usage( mbedtls_x509write_cert *ctx,
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unsigned int key_usage )
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{
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unsigned char buf[4], ku;
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unsigned char *c;
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int ret;
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/* We currently only support 7 bits, from 0x80 to 0x02 */
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if( ( key_usage & ~0xfe ) != 0 )
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return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
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c = buf + 4;
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ku = (unsigned char) key_usage;
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if( ( ret = mbedtls_asn1_write_bitstring( &c, buf, &ku, 7 ) ) != 4 )
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return( ret );
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ret = mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_KEY_USAGE,
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MBEDTLS_OID_SIZE( MBEDTLS_OID_KEY_USAGE ),
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1, buf, 4 );
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if( ret != 0 )
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return( ret );
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return( 0 );
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}
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int mbedtls_x509write_crt_set_ns_cert_type( mbedtls_x509write_cert *ctx,
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unsigned char ns_cert_type )
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{
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unsigned char buf[4];
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unsigned char *c;
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int ret;
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c = buf + 4;
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if( ( ret = mbedtls_asn1_write_bitstring( &c, buf, &ns_cert_type, 8 ) ) != 4 )
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return( ret );
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ret = mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_NS_CERT_TYPE,
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MBEDTLS_OID_SIZE( MBEDTLS_OID_NS_CERT_TYPE ),
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0, buf, 4 );
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if( ret != 0 )
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return( ret );
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return( 0 );
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}
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static int x509_write_time( unsigned char **p, unsigned char *start,
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const char *time, size_t size )
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{
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int ret;
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size_t len = 0;
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/*
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* write MBEDTLS_ASN1_UTC_TIME if year < 2050 (2 bytes shorter)
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*/
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if( time[0] == '2' && time[1] == '0' && time [2] < '5' )
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{
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start,
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(const unsigned char *) time + 2,
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size - 2 ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_UTC_TIME ) );
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}
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else
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{
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start,
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(const unsigned char *) time,
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size ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_GENERALIZED_TIME ) );
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}
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return( (int) len );
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}
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int mbedtls_x509write_crt_der( mbedtls_x509write_cert *ctx, unsigned char *buf, size_t size,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng )
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{
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int ret;
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const char *sig_oid;
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size_t sig_oid_len = 0;
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unsigned char *c, *c2;
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unsigned char hash[64];
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unsigned char sig[MBEDTLS_MPI_MAX_SIZE];
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unsigned char tmp_buf[2048];
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size_t sub_len = 0, pub_len = 0, sig_and_oid_len = 0, sig_len;
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size_t len = 0;
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mbedtls_pk_type_t pk_alg;
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/*
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* Prepare data to be signed in tmp_buf
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*/
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c = tmp_buf + sizeof( tmp_buf );
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/* Signature algorithm needed in TBS, and later for actual signature */
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pk_alg = mbedtls_pk_get_type( ctx->issuer_key );
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if( pk_alg == MBEDTLS_PK_ECKEY )
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pk_alg = MBEDTLS_PK_ECDSA;
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if( ( ret = mbedtls_oid_get_oid_by_sig_alg( pk_alg, ctx->md_alg,
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&sig_oid, &sig_oid_len ) ) != 0 )
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{
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return( ret );
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}
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/*
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* Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension
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*/
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_extensions( &c, tmp_buf, ctx->extensions ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONTEXT_SPECIFIC |
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MBEDTLS_ASN1_CONSTRUCTED | 3 ) );
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/*
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* SubjectPublicKeyInfo
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*/
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MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_pk_write_pubkey_der( ctx->subject_key,
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tmp_buf, c - tmp_buf ) );
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c -= pub_len;
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len += pub_len;
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/*
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* Subject ::= Name
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*/
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_names( &c, tmp_buf, ctx->subject ) );
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/*
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* Validity ::= SEQUENCE {
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* notBefore Time,
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* notAfter Time }
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*/
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sub_len = 0;
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MBEDTLS_ASN1_CHK_ADD( sub_len, x509_write_time( &c, tmp_buf, ctx->not_after,
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MBEDTLS_X509_RFC5280_UTC_TIME_LEN ) );
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MBEDTLS_ASN1_CHK_ADD( sub_len, x509_write_time( &c, tmp_buf, ctx->not_before,
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MBEDTLS_X509_RFC5280_UTC_TIME_LEN ) );
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len += sub_len;
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, sub_len ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE ) );
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/*
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* Issuer ::= Name
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*/
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_names( &c, tmp_buf, ctx->issuer ) );
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/*
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* Signature ::= AlgorithmIdentifier
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*/
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier( &c, tmp_buf,
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sig_oid, strlen( sig_oid ), 0 ) );
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/*
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* Serial ::= INTEGER
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*/
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, tmp_buf, &ctx->serial ) );
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/*
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* Version ::= INTEGER { v1(0), v2(1), v3(2) }
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*/
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sub_len = 0;
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MBEDTLS_ASN1_CHK_ADD( sub_len, mbedtls_asn1_write_int( &c, tmp_buf, ctx->version ) );
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len += sub_len;
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, sub_len ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONTEXT_SPECIFIC |
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MBEDTLS_ASN1_CONSTRUCTED | 0 ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE ) );
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/*
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* Make signature
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*/
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mbedtls_md( mbedtls_md_info_from_type( ctx->md_alg ), c, len, hash );
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if( ( ret = mbedtls_pk_sign( ctx->issuer_key, ctx->md_alg, hash, 0, sig, &sig_len,
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f_rng, p_rng ) ) != 0 )
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{
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return( ret );
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}
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/*
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* Write data to output buffer
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*/
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c2 = buf + size;
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MBEDTLS_ASN1_CHK_ADD( sig_and_oid_len, mbedtls_x509_write_sig( &c2, buf,
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sig_oid, sig_oid_len, sig, sig_len ) );
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c2 -= len;
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memcpy( c2, c, len );
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len += sig_and_oid_len;
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c2, buf, len ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c2, 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;
|
|
unsigned char output_buf[4096];
|
|
size_t olen = 0;
|
|
|
|
if( ( ret = mbedtls_x509write_crt_der( crt, output_buf, sizeof(output_buf),
|
|
f_rng, p_rng ) ) < 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_CRT, PEM_END_CRT,
|
|
output_buf + sizeof(output_buf) - ret,
|
|
ret, buf, size, &olen ) ) != 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_PEM_WRITE_C */
|
|
|
|
#endif /* MBEDTLS_X509_CRT_WRITE_C */
|