Willie Solano / mbedtls-slave-prot-prod

mbed TLS Build

Dependents:   Slave-prot-prod

library/x509write_csr.c@0:cdf462088d13, 2017-01-05 (annotated)

Committer:
markrad
Date:
Thu Jan 05 00:18:44 2017 +0000
Revision:
0:cdf462088d13
Initial commit

Who changed what in which revision?

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markrad 0:cdf462088d13 1 /*
markrad 0:cdf462088d13 2 * X.509 Certificate Signing Request writing
markrad 0:cdf462088d13 3 *
markrad 0:cdf462088d13 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
markrad 0:cdf462088d13 5 * SPDX-License-Identifier: Apache-2.0
markrad 0:cdf462088d13 6 *
markrad 0:cdf462088d13 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
markrad 0:cdf462088d13 8 * not use this file except in compliance with the License.
markrad 0:cdf462088d13 9 * You may obtain a copy of the License at
markrad 0:cdf462088d13 10 *
markrad 0:cdf462088d13 11 * http://www.apache.org/licenses/LICENSE-2.0
markrad 0:cdf462088d13 12 *
markrad 0:cdf462088d13 13 * Unless required by applicable law or agreed to in writing, software
markrad 0:cdf462088d13 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
markrad 0:cdf462088d13 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
markrad 0:cdf462088d13 16 * See the License for the specific language governing permissions and
markrad 0:cdf462088d13 17 * limitations under the License.
markrad 0:cdf462088d13 18 *
markrad 0:cdf462088d13 19 * This file is part of mbed TLS (https://tls.mbed.org)
markrad 0:cdf462088d13 20 */
markrad 0:cdf462088d13 21 /*
markrad 0:cdf462088d13 22 * References:
markrad 0:cdf462088d13 23 * - CSRs: PKCS#10 v1.7 aka RFC 2986
markrad 0:cdf462088d13 24 * - attributes: PKCS#9 v2.0 aka RFC 2985
markrad 0:cdf462088d13 25 */
markrad 0:cdf462088d13 26
markrad 0:cdf462088d13 27 #if !defined(MBEDTLS_CONFIG_FILE)
markrad 0:cdf462088d13 28 #include "mbedtls/config.h"
markrad 0:cdf462088d13 29 #else
markrad 0:cdf462088d13 30 #include MBEDTLS_CONFIG_FILE
markrad 0:cdf462088d13 31 #endif
markrad 0:cdf462088d13 32
markrad 0:cdf462088d13 33 #if defined(MBEDTLS_X509_CSR_WRITE_C)
markrad 0:cdf462088d13 34
markrad 0:cdf462088d13 35 #include "mbedtls/x509_csr.h"
markrad 0:cdf462088d13 36 #include "mbedtls/oid.h"
markrad 0:cdf462088d13 37 #include "mbedtls/asn1write.h"
markrad 0:cdf462088d13 38
markrad 0:cdf462088d13 39 #include <string.h>
markrad 0:cdf462088d13 40 #include <stdlib.h>
markrad 0:cdf462088d13 41
markrad 0:cdf462088d13 42 #if defined(MBEDTLS_PEM_WRITE_C)
markrad 0:cdf462088d13 43 #include "mbedtls/pem.h"
markrad 0:cdf462088d13 44 #endif
markrad 0:cdf462088d13 45
markrad 0:cdf462088d13 46 /* Implementation that should never be optimized out by the compiler */
markrad 0:cdf462088d13 47 static void mbedtls_zeroize( void *v, size_t n ) {
markrad 0:cdf462088d13 48 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
markrad 0:cdf462088d13 49 }
markrad 0:cdf462088d13 50
markrad 0:cdf462088d13 51 void mbedtls_x509write_csr_init( mbedtls_x509write_csr *ctx )
markrad 0:cdf462088d13 52 {
markrad 0:cdf462088d13 53 memset( ctx, 0, sizeof(mbedtls_x509write_csr) );
markrad 0:cdf462088d13 54 }
markrad 0:cdf462088d13 55
markrad 0:cdf462088d13 56 void mbedtls_x509write_csr_free( mbedtls_x509write_csr *ctx )
markrad 0:cdf462088d13 57 {
markrad 0:cdf462088d13 58 mbedtls_asn1_free_named_data_list( &ctx->subject );
markrad 0:cdf462088d13 59 mbedtls_asn1_free_named_data_list( &ctx->extensions );
markrad 0:cdf462088d13 60
markrad 0:cdf462088d13 61 mbedtls_zeroize( ctx, sizeof(mbedtls_x509write_csr) );
markrad 0:cdf462088d13 62 }
markrad 0:cdf462088d13 63
markrad 0:cdf462088d13 64 void mbedtls_x509write_csr_set_md_alg( mbedtls_x509write_csr *ctx, mbedtls_md_type_t md_alg )
markrad 0:cdf462088d13 65 {
markrad 0:cdf462088d13 66 ctx->md_alg = md_alg;
markrad 0:cdf462088d13 67 }
markrad 0:cdf462088d13 68
markrad 0:cdf462088d13 69 void mbedtls_x509write_csr_set_key( mbedtls_x509write_csr *ctx, mbedtls_pk_context *key )
markrad 0:cdf462088d13 70 {
markrad 0:cdf462088d13 71 ctx->key = key;
markrad 0:cdf462088d13 72 }
markrad 0:cdf462088d13 73
markrad 0:cdf462088d13 74 int mbedtls_x509write_csr_set_subject_name( mbedtls_x509write_csr *ctx,
markrad 0:cdf462088d13 75 const char *subject_name )
markrad 0:cdf462088d13 76 {
markrad 0:cdf462088d13 77 return mbedtls_x509_string_to_names( &ctx->subject, subject_name );
markrad 0:cdf462088d13 78 }
markrad 0:cdf462088d13 79
markrad 0:cdf462088d13 80 int mbedtls_x509write_csr_set_extension( mbedtls_x509write_csr *ctx,
markrad 0:cdf462088d13 81 const char *oid, size_t oid_len,
markrad 0:cdf462088d13 82 const unsigned char *val, size_t val_len )
markrad 0:cdf462088d13 83 {
markrad 0:cdf462088d13 84 return mbedtls_x509_set_extension( &ctx->extensions, oid, oid_len,
markrad 0:cdf462088d13 85 0, val, val_len );
markrad 0:cdf462088d13 86 }
markrad 0:cdf462088d13 87
markrad 0:cdf462088d13 88 int mbedtls_x509write_csr_set_key_usage( mbedtls_x509write_csr *ctx, unsigned char key_usage )
markrad 0:cdf462088d13 89 {
markrad 0:cdf462088d13 90 unsigned char buf[4];
markrad 0:cdf462088d13 91 unsigned char *c;
markrad 0:cdf462088d13 92 int ret;
markrad 0:cdf462088d13 93
markrad 0:cdf462088d13 94 c = buf + 4;
markrad 0:cdf462088d13 95
markrad 0:cdf462088d13 96 if( ( ret = mbedtls_asn1_write_bitstring( &c, buf, &key_usage, 7 ) ) != 4 )
markrad 0:cdf462088d13 97 return( ret );
markrad 0:cdf462088d13 98
markrad 0:cdf462088d13 99 ret = mbedtls_x509write_csr_set_extension( ctx, MBEDTLS_OID_KEY_USAGE,
markrad 0:cdf462088d13 100 MBEDTLS_OID_SIZE( MBEDTLS_OID_KEY_USAGE ),
markrad 0:cdf462088d13 101 buf, 4 );
markrad 0:cdf462088d13 102 if( ret != 0 )
markrad 0:cdf462088d13 103 return( ret );
markrad 0:cdf462088d13 104
markrad 0:cdf462088d13 105 return( 0 );
markrad 0:cdf462088d13 106 }
markrad 0:cdf462088d13 107
markrad 0:cdf462088d13 108 int mbedtls_x509write_csr_set_ns_cert_type( mbedtls_x509write_csr *ctx,
markrad 0:cdf462088d13 109 unsigned char ns_cert_type )
markrad 0:cdf462088d13 110 {
markrad 0:cdf462088d13 111 unsigned char buf[4];
markrad 0:cdf462088d13 112 unsigned char *c;
markrad 0:cdf462088d13 113 int ret;
markrad 0:cdf462088d13 114
markrad 0:cdf462088d13 115 c = buf + 4;
markrad 0:cdf462088d13 116
markrad 0:cdf462088d13 117 if( ( ret = mbedtls_asn1_write_bitstring( &c, buf, &ns_cert_type, 8 ) ) != 4 )
markrad 0:cdf462088d13 118 return( ret );
markrad 0:cdf462088d13 119
markrad 0:cdf462088d13 120 ret = mbedtls_x509write_csr_set_extension( ctx, MBEDTLS_OID_NS_CERT_TYPE,
markrad 0:cdf462088d13 121 MBEDTLS_OID_SIZE( MBEDTLS_OID_NS_CERT_TYPE ),
markrad 0:cdf462088d13 122 buf, 4 );
markrad 0:cdf462088d13 123 if( ret != 0 )
markrad 0:cdf462088d13 124 return( ret );
markrad 0:cdf462088d13 125
markrad 0:cdf462088d13 126 return( 0 );
markrad 0:cdf462088d13 127 }
markrad 0:cdf462088d13 128
markrad 0:cdf462088d13 129 int mbedtls_x509write_csr_der( mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size,
markrad 0:cdf462088d13 130 int (*f_rng)(void *, unsigned char *, size_t),
markrad 0:cdf462088d13 131 void *p_rng )
markrad 0:cdf462088d13 132 {
markrad 0:cdf462088d13 133 int ret;
markrad 0:cdf462088d13 134 const char *sig_oid;
markrad 0:cdf462088d13 135 size_t sig_oid_len = 0;
markrad 0:cdf462088d13 136 unsigned char *c, *c2;
markrad 0:cdf462088d13 137 unsigned char hash[64];
markrad 0:cdf462088d13 138 unsigned char sig[MBEDTLS_MPI_MAX_SIZE];
markrad 0:cdf462088d13 139 unsigned char tmp_buf[2048];
markrad 0:cdf462088d13 140 size_t pub_len = 0, sig_and_oid_len = 0, sig_len;
markrad 0:cdf462088d13 141 size_t len = 0;
markrad 0:cdf462088d13 142 mbedtls_pk_type_t pk_alg;
markrad 0:cdf462088d13 143
markrad 0:cdf462088d13 144 /*
markrad 0:cdf462088d13 145 * Prepare data to be signed in tmp_buf
markrad 0:cdf462088d13 146 */
markrad 0:cdf462088d13 147 c = tmp_buf + sizeof( tmp_buf );
markrad 0:cdf462088d13 148
markrad 0:cdf462088d13 149 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_extensions( &c, tmp_buf, ctx->extensions ) );
markrad 0:cdf462088d13 150
markrad 0:cdf462088d13 151 if( len )
markrad 0:cdf462088d13 152 {
markrad 0:cdf462088d13 153 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
markrad 0:cdf462088d13 154 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
markrad 0:cdf462088d13 155 MBEDTLS_ASN1_SEQUENCE ) );
markrad 0:cdf462088d13 156
markrad 0:cdf462088d13 157 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
markrad 0:cdf462088d13 158 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
markrad 0:cdf462088d13 159 MBEDTLS_ASN1_SET ) );
markrad 0:cdf462088d13 160
markrad 0:cdf462088d13 161 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( &c, tmp_buf, MBEDTLS_OID_PKCS9_CSR_EXT_REQ,
markrad 0:cdf462088d13 162 MBEDTLS_OID_SIZE( MBEDTLS_OID_PKCS9_CSR_EXT_REQ ) ) );
markrad 0:cdf462088d13 163
markrad 0:cdf462088d13 164 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
markrad 0:cdf462088d13 165 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
markrad 0:cdf462088d13 166 MBEDTLS_ASN1_SEQUENCE ) );
markrad 0:cdf462088d13 167 }
markrad 0:cdf462088d13 168
markrad 0:cdf462088d13 169 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
markrad 0:cdf462088d13 170 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
markrad 0:cdf462088d13 171 MBEDTLS_ASN1_CONTEXT_SPECIFIC ) );
markrad 0:cdf462088d13 172
markrad 0:cdf462088d13 173 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_pk_write_pubkey_der( ctx->key,
markrad 0:cdf462088d13 174 tmp_buf, c - tmp_buf ) );
markrad 0:cdf462088d13 175 c -= pub_len;
markrad 0:cdf462088d13 176 len += pub_len;
markrad 0:cdf462088d13 177
markrad 0:cdf462088d13 178 /*
markrad 0:cdf462088d13 179 * Subject ::= Name
markrad 0:cdf462088d13 180 */
markrad 0:cdf462088d13 181 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_names( &c, tmp_buf, ctx->subject ) );
markrad 0:cdf462088d13 182
markrad 0:cdf462088d13 183 /*
markrad 0:cdf462088d13 184 * Version ::= INTEGER { v1(0), v2(1), v3(2) }
markrad 0:cdf462088d13 185 */
markrad 0:cdf462088d13 186 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, tmp_buf, 0 ) );
markrad 0:cdf462088d13 187
markrad 0:cdf462088d13 188 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
markrad 0:cdf462088d13 189 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
markrad 0:cdf462088d13 190 MBEDTLS_ASN1_SEQUENCE ) );
markrad 0:cdf462088d13 191
markrad 0:cdf462088d13 192 /*
markrad 0:cdf462088d13 193 * Prepare signature
markrad 0:cdf462088d13 194 */
markrad 0:cdf462088d13 195 mbedtls_md( mbedtls_md_info_from_type( ctx->md_alg ), c, len, hash );
markrad 0:cdf462088d13 196
markrad 0:cdf462088d13 197 pk_alg = mbedtls_pk_get_type( ctx->key );
markrad 0:cdf462088d13 198 if( pk_alg == MBEDTLS_PK_ECKEY )
markrad 0:cdf462088d13 199 pk_alg = MBEDTLS_PK_ECDSA;
markrad 0:cdf462088d13 200
markrad 0:cdf462088d13 201 if( ( ret = mbedtls_pk_sign( ctx->key, ctx->md_alg, hash, 0, sig, &sig_len,
markrad 0:cdf462088d13 202 f_rng, p_rng ) ) != 0 ||
markrad 0:cdf462088d13 203 ( ret = mbedtls_oid_get_oid_by_sig_alg( pk_alg, ctx->md_alg,
markrad 0:cdf462088d13 204 &sig_oid, &sig_oid_len ) ) != 0 )
markrad 0:cdf462088d13 205 {
markrad 0:cdf462088d13 206 return( ret );
markrad 0:cdf462088d13 207 }
markrad 0:cdf462088d13 208
markrad 0:cdf462088d13 209 /*
markrad 0:cdf462088d13 210 * Write data to output buffer
markrad 0:cdf462088d13 211 */
markrad 0:cdf462088d13 212 c2 = buf + size;
markrad 0:cdf462088d13 213 MBEDTLS_ASN1_CHK_ADD( sig_and_oid_len, mbedtls_x509_write_sig( &c2, buf,
markrad 0:cdf462088d13 214 sig_oid, sig_oid_len, sig, sig_len ) );
markrad 0:cdf462088d13 215
markrad 0:cdf462088d13 216 if( len > (size_t)( c2 - buf ) )
markrad 0:cdf462088d13 217 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
markrad 0:cdf462088d13 218
markrad 0:cdf462088d13 219 c2 -= len;
markrad 0:cdf462088d13 220 memcpy( c2, c, len );
markrad 0:cdf462088d13 221
markrad 0:cdf462088d13 222 len += sig_and_oid_len;
markrad 0:cdf462088d13 223 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c2, buf, len ) );
markrad 0:cdf462088d13 224 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c2, buf, MBEDTLS_ASN1_CONSTRUCTED |
markrad 0:cdf462088d13 225 MBEDTLS_ASN1_SEQUENCE ) );
markrad 0:cdf462088d13 226
markrad 0:cdf462088d13 227 return( (int) len );
markrad 0:cdf462088d13 228 }
markrad 0:cdf462088d13 229
markrad 0:cdf462088d13 230 #define PEM_BEGIN_CSR "-----BEGIN CERTIFICATE REQUEST-----\n"
markrad 0:cdf462088d13 231 #define PEM_END_CSR "-----END CERTIFICATE REQUEST-----\n"
markrad 0:cdf462088d13 232
markrad 0:cdf462088d13 233 #if defined(MBEDTLS_PEM_WRITE_C)
markrad 0:cdf462088d13 234 int mbedtls_x509write_csr_pem( mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size,
markrad 0:cdf462088d13 235 int (*f_rng)(void *, unsigned char *, size_t),
markrad 0:cdf462088d13 236 void *p_rng )
markrad 0:cdf462088d13 237 {
markrad 0:cdf462088d13 238 int ret;
markrad 0:cdf462088d13 239 unsigned char output_buf[4096];
markrad 0:cdf462088d13 240 size_t olen = 0;
markrad 0:cdf462088d13 241
markrad 0:cdf462088d13 242 if( ( ret = mbedtls_x509write_csr_der( ctx, output_buf, sizeof(output_buf),
markrad 0:cdf462088d13 243 f_rng, p_rng ) ) < 0 )
markrad 0:cdf462088d13 244 {
markrad 0:cdf462088d13 245 return( ret );
markrad 0:cdf462088d13 246 }
markrad 0:cdf462088d13 247
markrad 0:cdf462088d13 248 if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_CSR, PEM_END_CSR,
markrad 0:cdf462088d13 249 output_buf + sizeof(output_buf) - ret,
markrad 0:cdf462088d13 250 ret, buf, size, &olen ) ) != 0 )
markrad 0:cdf462088d13 251 {
markrad 0:cdf462088d13 252 return( ret );
markrad 0:cdf462088d13 253 }
markrad 0:cdf462088d13 254
markrad 0:cdf462088d13 255 return( 0 );
markrad 0:cdf462088d13 256 }
markrad 0:cdf462088d13 257 #endif /* MBEDTLS_PEM_WRITE_C */
markrad 0:cdf462088d13 258
markrad 0:cdf462088d13 259 #endif /* MBEDTLS_X509_CSR_WRITE_C */