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3053fea160
On a few of our buildbot instances, we get warnings about the usage of deprecated functions. We should correct these, especially if we're delegating to system versions of the libraries if they're available. However, in order to do that, we need to update our library variant from 2.1.1 so that the non-deprecated alternatives are actually available.
291 lines
9.3 KiB
C
291 lines
9.3 KiB
C
/*
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* X.509 Certificate Signing Request 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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* - 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_CSR_WRITE_C)
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#include "mbedtls/x509_csr.h"
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#include "mbedtls/oid.h"
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#include "mbedtls/asn1write.h"
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#include "mbedtls/platform_util.h"
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#include <string.h>
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#include <stdlib.h>
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#if defined(MBEDTLS_PEM_WRITE_C)
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#include "mbedtls/pem.h"
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#endif
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void mbedtls_x509write_csr_init( mbedtls_x509write_csr *ctx )
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{
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memset( ctx, 0, sizeof( mbedtls_x509write_csr ) );
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}
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void mbedtls_x509write_csr_free( mbedtls_x509write_csr *ctx )
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{
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mbedtls_asn1_free_named_data_list( &ctx->subject );
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mbedtls_asn1_free_named_data_list( &ctx->extensions );
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mbedtls_platform_zeroize( ctx, sizeof( mbedtls_x509write_csr ) );
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}
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void mbedtls_x509write_csr_set_md_alg( mbedtls_x509write_csr *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_csr_set_key( mbedtls_x509write_csr *ctx, mbedtls_pk_context *key )
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{
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ctx->key = key;
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}
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int mbedtls_x509write_csr_set_subject_name( mbedtls_x509write_csr *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_csr_set_extension( mbedtls_x509write_csr *ctx,
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const char *oid, size_t oid_len,
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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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0, val, val_len );
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}
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static size_t csr_get_unused_bits_for_named_bitstring( unsigned char bitstring,
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size_t bit_offset )
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{
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size_t unused_bits;
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/* Count the unused bits removing trailing 0s */
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for( unused_bits = bit_offset; unused_bits < 8; unused_bits++ )
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if( ( ( bitstring >> unused_bits ) & 0x1 ) != 0 )
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break;
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return( unused_bits );
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}
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int mbedtls_x509write_csr_set_key_usage( mbedtls_x509write_csr *ctx, unsigned char key_usage )
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{
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unsigned char buf[4];
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unsigned char *c;
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size_t unused_bits;
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int ret;
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c = buf + 4;
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unused_bits = csr_get_unused_bits_for_named_bitstring( key_usage, 0 );
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ret = mbedtls_asn1_write_bitstring( &c, buf, &key_usage, 8 - unused_bits );
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if( ret < 0 )
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return( ret );
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else if( ret < 3 || ret > 4 )
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return( MBEDTLS_ERR_X509_INVALID_FORMAT );
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ret = mbedtls_x509write_csr_set_extension( ctx, MBEDTLS_OID_KEY_USAGE,
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MBEDTLS_OID_SIZE( MBEDTLS_OID_KEY_USAGE ),
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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_csr_set_ns_cert_type( mbedtls_x509write_csr *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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size_t unused_bits;
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int ret;
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c = buf + 4;
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unused_bits = csr_get_unused_bits_for_named_bitstring( ns_cert_type, 0 );
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ret = mbedtls_asn1_write_bitstring( &c,
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buf,
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&ns_cert_type,
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8 - unused_bits );
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if( ret < 0 )
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return( ret );
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else if( ret < 3 || ret > 4 )
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return( ret );
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ret = mbedtls_x509write_csr_set_extension( ctx, MBEDTLS_OID_NS_CERT_TYPE,
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MBEDTLS_OID_SIZE( MBEDTLS_OID_NS_CERT_TYPE ),
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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_csr_der( mbedtls_x509write_csr *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 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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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_extensions( &c, tmp_buf, ctx->extensions ) );
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if( len )
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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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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_SET ) );
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( &c, tmp_buf, MBEDTLS_OID_PKCS9_CSR_EXT_REQ,
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MBEDTLS_OID_SIZE( MBEDTLS_OID_PKCS9_CSR_EXT_REQ ) ) );
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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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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_CONTEXT_SPECIFIC ) );
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MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_pk_write_pubkey_der( ctx->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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* Version ::= INTEGER { v1(0), v2(1), v3(2) }
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*/
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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, tmp_buf, 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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* Prepare 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->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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if( mbedtls_pk_can_do( ctx->key, MBEDTLS_PK_RSA ) )
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pk_alg = MBEDTLS_PK_RSA;
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else if( mbedtls_pk_can_do( ctx->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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* 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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if( len > (size_t)( c2 - buf ) )
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return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
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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 |
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MBEDTLS_ASN1_SEQUENCE ) );
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return( (int) len );
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}
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#define PEM_BEGIN_CSR "-----BEGIN CERTIFICATE REQUEST-----\n"
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#define PEM_END_CSR "-----END CERTIFICATE REQUEST-----\n"
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#if defined(MBEDTLS_PEM_WRITE_C)
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int mbedtls_x509write_csr_pem( mbedtls_x509write_csr *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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unsigned char output_buf[4096];
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size_t olen = 0;
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if( ( ret = mbedtls_x509write_csr_der( ctx, output_buf, sizeof(output_buf),
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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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if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_CSR, PEM_END_CSR,
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output_buf + sizeof(output_buf) - ret,
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ret, buf, size, &olen ) ) != 0 )
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{
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return( ret );
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}
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return( 0 );
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}
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#endif /* MBEDTLS_PEM_WRITE_C */
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#endif /* MBEDTLS_X509_CSR_WRITE_C */
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