592 lines
20 KiB
C
592 lines
20 KiB
C
/*
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* X.509 certificate writing
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*
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* Copyright The Mbed TLS Contributors
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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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/*
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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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#include "common.h"
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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/asn1write.h"
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#include "mbedtls/error.h"
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#include "mbedtls/oid.h"
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#include "mbedtls/platform_util.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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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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#include "psa/crypto.h"
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#include "mbedtls/psa_util.h"
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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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_platform_zeroize( ctx, sizeof( mbedtls_x509write_cert ) );
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}
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void mbedtls_x509write_crt_set_version( mbedtls_x509write_cert *ctx,
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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,
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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,
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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,
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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,
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const mbedtls_mpi *serial )
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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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,
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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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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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,
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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,
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MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE ) );
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return(
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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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is_ca, buf + sizeof(buf) - len, len ) );
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}
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#if defined(MBEDTLS_SHA1_C)
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static int mbedtls_x509write_crt_set_key_identifier( mbedtls_x509write_cert *ctx,
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int is_ca,
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unsigned char tag )
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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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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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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size_t hash_length;
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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memset( buf, 0, sizeof(buf) );
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MBEDTLS_ASN1_CHK_ADD( len,
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mbedtls_pk_write_pubkey( &c,
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buf,
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is_ca ?
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ctx->issuer_key :
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ctx->subject_key ) );
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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status = psa_hash_compute( PSA_ALG_SHA_1,
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buf + sizeof(buf) - len,
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len,
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buf + sizeof(buf) - 20,
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20,
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&hash_length );
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if( status != PSA_SUCCESS )
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{
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return( MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED );
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}
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#else
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ret = mbedtls_sha1( 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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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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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, tag ) );
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if( is_ca ) // writes AuthorityKeyIdentifier sequence
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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,
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mbedtls_asn1_write_tag( &c,
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buf,
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MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE ) );
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}
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if( is_ca )
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return( mbedtls_x509write_crt_set_extension( ctx,
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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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else
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return( mbedtls_x509write_crt_set_extension( ctx,
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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_subject_key_identifier( mbedtls_x509write_cert *ctx )
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{
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return mbedtls_x509write_crt_set_key_identifier( ctx,
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0,
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MBEDTLS_ASN1_OCTET_STRING );
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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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return mbedtls_x509write_crt_set_key_identifier( ctx,
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1,
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(MBEDTLS_ASN1_CONTEXT_SPECIFIC | 0) );
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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[5] = {0}, ku[2] = {0};
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unsigned char *c;
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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const unsigned int allowed_bits = MBEDTLS_X509_KU_DIGITAL_SIGNATURE |
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MBEDTLS_X509_KU_NON_REPUDIATION |
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MBEDTLS_X509_KU_KEY_ENCIPHERMENT |
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MBEDTLS_X509_KU_DATA_ENCIPHERMENT |
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MBEDTLS_X509_KU_KEY_AGREEMENT |
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MBEDTLS_X509_KU_KEY_CERT_SIGN |
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MBEDTLS_X509_KU_CRL_SIGN |
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MBEDTLS_X509_KU_ENCIPHER_ONLY |
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MBEDTLS_X509_KU_DECIPHER_ONLY;
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/* Check that nothing other than the allowed flags is set */
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if( ( key_usage & ~allowed_bits ) != 0 )
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return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
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c = buf + 5;
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MBEDTLS_PUT_UINT16_LE( key_usage, ku, 0 );
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ret = mbedtls_asn1_write_named_bitstring( &c, buf, ku, 9 );
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if( ret < 0 )
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return( ret );
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else if( ret < 3 || ret > 5 )
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return( MBEDTLS_ERR_X509_INVALID_FORMAT );
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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, c, (size_t)ret );
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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] = {0};
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unsigned char *c;
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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c = buf + 4;
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ret = mbedtls_asn1_write_named_bitstring( &c, buf, &ns_cert_type, 8 );
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if( ret < 3 || ret > 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, c, (size_t)ret );
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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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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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,
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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,
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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,
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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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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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 sig[MBEDTLS_PK_SIGNATURE_MAX_SIZE];
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size_t hash_length = 0;
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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psa_algorithm_t psa_algorithm;
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unsigned char hash[PSA_HASH_MAX_SIZE];
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#else
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unsigned char hash[64];
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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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 at the end of the target buffer
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*/
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c = buf + size;
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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,
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mbedtls_x509_write_extensions( &c,
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buf, ctx->extensions ) );
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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,
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mbedtls_asn1_write_tag( &c, buf,
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MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE ) );
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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,
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mbedtls_asn1_write_tag( &c, buf,
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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,
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mbedtls_pk_write_pubkey_der( ctx->subject_key,
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buf, c - 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,
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mbedtls_x509_write_names( &c, buf,
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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,
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x509_write_time( &c, buf, ctx->not_after,
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MBEDTLS_X509_RFC5280_UTC_TIME_LEN ) );
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MBEDTLS_ASN1_CHK_ADD( sub_len,
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x509_write_time( &c, 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, buf, sub_len ) );
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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 defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
psa_algorithm = mbedtls_psa_translate_md( ctx->md_alg );
|
|
|
|
status = psa_hash_compute( psa_algorithm,
|
|
c,
|
|
len,
|
|
hash,
|
|
sizeof( hash ),
|
|
&hash_length );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
return( MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED );
|
|
}
|
|
#else
|
|
if( ( ret = mbedtls_md( mbedtls_md_info_from_type( ctx->md_alg ), c,
|
|
len, hash ) ) != 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
#endif /* MBEDTLS_USE_PSA_CRYPTO */
|
|
|
|
|
|
if( ( ret = mbedtls_pk_sign( ctx->issuer_key, ctx->md_alg,
|
|
hash, hash_length, sig, sizeof( 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 */
|