485 lines
16 KiB
C
485 lines
16 KiB
C
/*
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* X.509 certificate writing
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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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/*
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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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ret = mbedtls_sha1_ret( buf + sizeof( buf ) - len, len,
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buf + sizeof( buf ) - 20 );
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if( ret != 0 )
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return( ret );
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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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ret = mbedtls_sha1_ret( buf + sizeof( buf ) - len, len,
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buf + sizeof( buf ) - 20 );
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if( ret != 0 )
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return( ret );
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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 *t, 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( t[0] == '2' && t[1] == '0' && t[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 *) t + 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 *) t,
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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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/* There's no direct way of extracting a signature algorithm
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* (represented as an element of mbedtls_pk_type_t) from a PK instance. */
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if( mbedtls_pk_can_do( ctx->issuer_key, MBEDTLS_PK_RSA ) )
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pk_alg = MBEDTLS_PK_RSA;
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else if( mbedtls_pk_can_do( ctx->issuer_key, MBEDTLS_PK_ECDSA ) )
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pk_alg = MBEDTLS_PK_ECDSA;
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else
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return( MBEDTLS_ERR_X509_INVALID_ALG );
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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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/* Only for v3 */
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if( ctx->version == MBEDTLS_X509_CRT_VERSION_3 )
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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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/*
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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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/* Can be omitted for v1 */
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if( ctx->version != MBEDTLS_X509_CRT_VERSION_1 )
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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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}
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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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if( ( ret = mbedtls_md( mbedtls_md_info_from_type( ctx->md_alg ), c,
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len, hash ) ) != 0 )
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{
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return( ret );
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}
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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 )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
* Write data to output buffer
|
|
*/
|
|
c2 = buf + size;
|
|
MBEDTLS_ASN1_CHK_ADD( sig_and_oid_len, mbedtls_x509_write_sig( &c2, buf,
|
|
sig_oid, sig_oid_len, sig, sig_len ) );
|
|
|
|
if( len > (size_t)( c2 - buf ) )
|
|
return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
|
|
|
|
c2 -= len;
|
|
memcpy( c2, c, len );
|
|
|
|
len += sig_and_oid_len;
|
|
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c2, buf, len ) );
|
|
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 */
|