/* | |
* X.509 Certificate Signing Request writing | |
* | |
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved | |
* SPDX-License-Identifier: Apache-2.0 | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); you may | |
* not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | |
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
* | |
* This file is part of mbed TLS (https://tls.mbed.org) | |
*/ | |
/* | |
* References: | |
* - CSRs: PKCS#10 v1.7 aka RFC 2986 | |
* - attributes: PKCS#9 v2.0 aka RFC 2985 | |
*/ | |
#if !defined(MBEDTLS_CONFIG_FILE) | |
#include "mbedtls/config.h" | |
#else | |
#include MBEDTLS_CONFIG_FILE | |
#endif | |
#if defined(MBEDTLS_X509_CSR_WRITE_C) | |
#include "mbedtls/x509_csr.h" | |
#include "mbedtls/oid.h" | |
#include "mbedtls/asn1write.h" | |
#include "mbedtls/platform_util.h" | |
#if defined(MBEDTLS_USE_PSA_CRYPTO) | |
#include "psa/crypto.h" | |
#include "mbedtls/psa_util.h" | |
#endif | |
#include <string.h> | |
#include <stdlib.h> | |
#if defined(MBEDTLS_PEM_WRITE_C) | |
#include "mbedtls/pem.h" | |
#endif | |
void mbedtls_x509write_csr_init( mbedtls_x509write_csr *ctx ) | |
{ | |
memset( ctx, 0, sizeof( mbedtls_x509write_csr ) ); | |
} | |
void mbedtls_x509write_csr_free( mbedtls_x509write_csr *ctx ) | |
{ | |
mbedtls_asn1_free_named_data_list( &ctx->subject ); | |
mbedtls_asn1_free_named_data_list( &ctx->extensions ); | |
mbedtls_platform_zeroize( ctx, sizeof( mbedtls_x509write_csr ) ); | |
} | |
void mbedtls_x509write_csr_set_md_alg( mbedtls_x509write_csr *ctx, mbedtls_md_type_t md_alg ) | |
{ | |
ctx->md_alg = md_alg; | |
} | |
void mbedtls_x509write_csr_set_key( mbedtls_x509write_csr *ctx, mbedtls_pk_context *key ) | |
{ | |
ctx->key = key; | |
} | |
int mbedtls_x509write_csr_set_subject_name( mbedtls_x509write_csr *ctx, | |
const char *subject_name ) | |
{ | |
return mbedtls_x509_string_to_names( &ctx->subject, subject_name ); | |
} | |
int mbedtls_x509write_csr_set_extension( mbedtls_x509write_csr *ctx, | |
const char *oid, size_t oid_len, | |
const unsigned char *val, size_t val_len ) | |
{ | |
return mbedtls_x509_set_extension( &ctx->extensions, oid, oid_len, | |
0, val, val_len ); | |
} | |
int mbedtls_x509write_csr_set_key_usage( mbedtls_x509write_csr *ctx, unsigned char key_usage ) | |
{ | |
unsigned char buf[4]; | |
unsigned char *c; | |
int ret; | |
c = buf + 4; | |
ret = mbedtls_asn1_write_named_bitstring( &c, buf, &key_usage, 8 ); | |
if( ret < 3 || ret > 4 ) | |
return( ret ); | |
ret = mbedtls_x509write_csr_set_extension( ctx, MBEDTLS_OID_KEY_USAGE, | |
MBEDTLS_OID_SIZE( MBEDTLS_OID_KEY_USAGE ), | |
c, (size_t)ret ); | |
if( ret != 0 ) | |
return( ret ); | |
return( 0 ); | |
} | |
int mbedtls_x509write_csr_set_ns_cert_type( mbedtls_x509write_csr *ctx, | |
unsigned char ns_cert_type ) | |
{ | |
unsigned char buf[4]; | |
unsigned char *c; | |
int ret; | |
c = buf + 4; | |
ret = mbedtls_asn1_write_named_bitstring( &c, buf, &ns_cert_type, 8 ); | |
if( ret < 3 || ret > 4 ) | |
return( ret ); | |
ret = mbedtls_x509write_csr_set_extension( ctx, MBEDTLS_OID_NS_CERT_TYPE, | |
MBEDTLS_OID_SIZE( MBEDTLS_OID_NS_CERT_TYPE ), | |
c, (size_t)ret ); | |
if( ret != 0 ) | |
return( ret ); | |
return( 0 ); | |
} | |
int mbedtls_x509write_csr_der( mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size, | |
int (*f_rng)(void *, unsigned char *, size_t), | |
void *p_rng ) | |
{ | |
int ret; | |
const char *sig_oid; | |
size_t sig_oid_len = 0; | |
unsigned char *c, *c2; | |
unsigned char hash[64]; | |
unsigned char sig[MBEDTLS_MPI_MAX_SIZE]; | |
unsigned char tmp_buf[2048]; | |
size_t pub_len = 0, sig_and_oid_len = 0, sig_len; | |
size_t len = 0; | |
mbedtls_pk_type_t pk_alg; | |
#if defined(MBEDTLS_USE_PSA_CRYPTO) | |
psa_hash_operation_t hash_operation = PSA_HASH_OPERATION_INIT; | |
size_t hash_len; | |
psa_algorithm_t hash_alg = mbedtls_psa_translate_md( ctx->md_alg ); | |
#endif /* MBEDTLS_USE_PSA_CRYPTO */ | |
/* | |
* Prepare data to be signed in tmp_buf | |
*/ | |
c = tmp_buf + sizeof( tmp_buf ); | |
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_extensions( &c, tmp_buf, ctx->extensions ) ); | |
if( len ) | |
{ | |
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) ); | |
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED | | |
MBEDTLS_ASN1_SEQUENCE ) ); | |
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) ); | |
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED | | |
MBEDTLS_ASN1_SET ) ); | |
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( &c, tmp_buf, MBEDTLS_OID_PKCS9_CSR_EXT_REQ, | |
MBEDTLS_OID_SIZE( MBEDTLS_OID_PKCS9_CSR_EXT_REQ ) ) ); | |
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) ); | |
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED | | |
MBEDTLS_ASN1_SEQUENCE ) ); | |
} | |
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) ); | |
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED | | |
MBEDTLS_ASN1_CONTEXT_SPECIFIC ) ); | |
MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_pk_write_pubkey_der( ctx->key, | |
tmp_buf, c - tmp_buf ) ); | |
c -= pub_len; | |
len += pub_len; | |
/* | |
* Subject ::= Name | |
*/ | |
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_names( &c, tmp_buf, ctx->subject ) ); | |
/* | |
* Version ::= INTEGER { v1(0), v2(1), v3(2) } | |
*/ | |
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, tmp_buf, 0 ) ); | |
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) ); | |
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED | | |
MBEDTLS_ASN1_SEQUENCE ) ); | |
/* | |
* Prepare signature | |
* Note: hash errors can happen only after an internal error | |
*/ | |
#if defined(MBEDTLS_USE_PSA_CRYPTO) | |
if( psa_hash_setup( &hash_operation, hash_alg ) != PSA_SUCCESS ) | |
return( MBEDTLS_ERR_X509_FATAL_ERROR ); | |
if( psa_hash_update( &hash_operation, c, len ) != PSA_SUCCESS ) | |
return( MBEDTLS_ERR_X509_FATAL_ERROR ); | |
if( psa_hash_finish( &hash_operation, hash, sizeof( hash ), &hash_len ) | |
!= PSA_SUCCESS ) | |
{ | |
return( MBEDTLS_ERR_X509_FATAL_ERROR ); | |
} | |
#else /* MBEDTLS_USE_PSA_CRYPTO */ | |
mbedtls_md( mbedtls_md_info_from_type( ctx->md_alg ), c, len, hash ); | |
#endif | |
if( ( ret = mbedtls_pk_sign( ctx->key, ctx->md_alg, hash, 0, sig, &sig_len, | |
f_rng, p_rng ) ) != 0 ) | |
{ | |
return( ret ); | |
} | |
if( mbedtls_pk_can_do( ctx->key, MBEDTLS_PK_RSA ) ) | |
pk_alg = MBEDTLS_PK_RSA; | |
else if( mbedtls_pk_can_do( ctx->key, MBEDTLS_PK_ECDSA ) ) | |
pk_alg = MBEDTLS_PK_ECDSA; | |
else | |
return( MBEDTLS_ERR_X509_INVALID_ALG ); | |
if( ( ret = mbedtls_oid_get_oid_by_sig_alg( pk_alg, ctx->md_alg, | |
&sig_oid, &sig_oid_len ) ) != 0 ) | |
{ | |
return( ret ); | |
} | |
/* | |
* 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_CSR "-----BEGIN CERTIFICATE REQUEST-----\n" | |
#define PEM_END_CSR "-----END CERTIFICATE REQUEST-----\n" | |
#if defined(MBEDTLS_PEM_WRITE_C) | |
int mbedtls_x509write_csr_pem( mbedtls_x509write_csr *ctx, 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_csr_der( ctx, output_buf, sizeof(output_buf), | |
f_rng, p_rng ) ) < 0 ) | |
{ | |
return( ret ); | |
} | |
if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_CSR, PEM_END_CSR, | |
output_buf + sizeof(output_buf) - ret, | |
ret, buf, size, &olen ) ) != 0 ) | |
{ | |
return( ret ); | |
} | |
return( 0 ); | |
} | |
#endif /* MBEDTLS_PEM_WRITE_C */ | |
#endif /* MBEDTLS_X509_CSR_WRITE_C */ |