mbed TLS library
Dependents: HTTPClient-SSL WS_SERVER
polarssl/x509write_csr.c@0:137634ff4186, 2015-06-11 (annotated)
- Committer:
- ansond
- Date:
- Thu Jun 11 03:27:03 2015 +0000
- Revision:
- 0:137634ff4186
initial commit
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
ansond | 0:137634ff4186 | 1 | /* |
ansond | 0:137634ff4186 | 2 | * X.509 Certificate Signing Request writing |
ansond | 0:137634ff4186 | 3 | * |
ansond | 0:137634ff4186 | 4 | * Copyright (C) 2006-2014, ARM Limited, All Rights Reserved |
ansond | 0:137634ff4186 | 5 | * |
ansond | 0:137634ff4186 | 6 | * This file is part of mbed TLS (https://tls.mbed.org) |
ansond | 0:137634ff4186 | 7 | * |
ansond | 0:137634ff4186 | 8 | * This program is free software; you can redistribute it and/or modify |
ansond | 0:137634ff4186 | 9 | * it under the terms of the GNU General Public License as published by |
ansond | 0:137634ff4186 | 10 | * the Free Software Foundation; either version 2 of the License, or |
ansond | 0:137634ff4186 | 11 | * (at your option) any later version. |
ansond | 0:137634ff4186 | 12 | * |
ansond | 0:137634ff4186 | 13 | * This program is distributed in the hope that it will be useful, |
ansond | 0:137634ff4186 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
ansond | 0:137634ff4186 | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
ansond | 0:137634ff4186 | 16 | * GNU General Public License for more details. |
ansond | 0:137634ff4186 | 17 | * |
ansond | 0:137634ff4186 | 18 | * You should have received a copy of the GNU General Public License along |
ansond | 0:137634ff4186 | 19 | * with this program; if not, write to the Free Software Foundation, Inc., |
ansond | 0:137634ff4186 | 20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
ansond | 0:137634ff4186 | 21 | */ |
ansond | 0:137634ff4186 | 22 | /* |
ansond | 0:137634ff4186 | 23 | * References: |
ansond | 0:137634ff4186 | 24 | * - CSRs: PKCS#10 v1.7 aka RFC 2986 |
ansond | 0:137634ff4186 | 25 | * - attributes: PKCS#9 v2.0 aka RFC 2985 |
ansond | 0:137634ff4186 | 26 | */ |
ansond | 0:137634ff4186 | 27 | |
ansond | 0:137634ff4186 | 28 | #if !defined(POLARSSL_CONFIG_FILE) |
ansond | 0:137634ff4186 | 29 | #include "polarssl/config.h" |
ansond | 0:137634ff4186 | 30 | #else |
ansond | 0:137634ff4186 | 31 | #include POLARSSL_CONFIG_FILE |
ansond | 0:137634ff4186 | 32 | #endif |
ansond | 0:137634ff4186 | 33 | |
ansond | 0:137634ff4186 | 34 | #if defined(POLARSSL_X509_CSR_WRITE_C) |
ansond | 0:137634ff4186 | 35 | |
ansond | 0:137634ff4186 | 36 | #include "polarssl/x509_csr.h" |
ansond | 0:137634ff4186 | 37 | #include "polarssl/oid.h" |
ansond | 0:137634ff4186 | 38 | #include "polarssl/asn1write.h" |
ansond | 0:137634ff4186 | 39 | |
ansond | 0:137634ff4186 | 40 | #include <string.h> |
ansond | 0:137634ff4186 | 41 | #include <stdlib.h> |
ansond | 0:137634ff4186 | 42 | |
ansond | 0:137634ff4186 | 43 | #if defined(POLARSSL_PEM_WRITE_C) |
ansond | 0:137634ff4186 | 44 | #include "polarssl/pem.h" |
ansond | 0:137634ff4186 | 45 | #endif |
ansond | 0:137634ff4186 | 46 | |
ansond | 0:137634ff4186 | 47 | /* Implementation that should never be optimized out by the compiler */ |
ansond | 0:137634ff4186 | 48 | static void polarssl_zeroize( void *v, size_t n ) { |
ansond | 0:137634ff4186 | 49 | volatile unsigned char *p = v; while( n-- ) *p++ = 0; |
ansond | 0:137634ff4186 | 50 | } |
ansond | 0:137634ff4186 | 51 | |
ansond | 0:137634ff4186 | 52 | void x509write_csr_init( x509write_csr *ctx ) |
ansond | 0:137634ff4186 | 53 | { |
ansond | 0:137634ff4186 | 54 | memset( ctx, 0, sizeof(x509write_csr) ); |
ansond | 0:137634ff4186 | 55 | } |
ansond | 0:137634ff4186 | 56 | |
ansond | 0:137634ff4186 | 57 | void x509write_csr_free( x509write_csr *ctx ) |
ansond | 0:137634ff4186 | 58 | { |
ansond | 0:137634ff4186 | 59 | asn1_free_named_data_list( &ctx->subject ); |
ansond | 0:137634ff4186 | 60 | asn1_free_named_data_list( &ctx->extensions ); |
ansond | 0:137634ff4186 | 61 | |
ansond | 0:137634ff4186 | 62 | polarssl_zeroize( ctx, sizeof(x509write_csr) ); |
ansond | 0:137634ff4186 | 63 | } |
ansond | 0:137634ff4186 | 64 | |
ansond | 0:137634ff4186 | 65 | void x509write_csr_set_md_alg( x509write_csr *ctx, md_type_t md_alg ) |
ansond | 0:137634ff4186 | 66 | { |
ansond | 0:137634ff4186 | 67 | ctx->md_alg = md_alg; |
ansond | 0:137634ff4186 | 68 | } |
ansond | 0:137634ff4186 | 69 | |
ansond | 0:137634ff4186 | 70 | void x509write_csr_set_key( x509write_csr *ctx, pk_context *key ) |
ansond | 0:137634ff4186 | 71 | { |
ansond | 0:137634ff4186 | 72 | ctx->key = key; |
ansond | 0:137634ff4186 | 73 | } |
ansond | 0:137634ff4186 | 74 | |
ansond | 0:137634ff4186 | 75 | int x509write_csr_set_subject_name( x509write_csr *ctx, |
ansond | 0:137634ff4186 | 76 | const char *subject_name ) |
ansond | 0:137634ff4186 | 77 | { |
ansond | 0:137634ff4186 | 78 | return x509_string_to_names( &ctx->subject, subject_name ); |
ansond | 0:137634ff4186 | 79 | } |
ansond | 0:137634ff4186 | 80 | |
ansond | 0:137634ff4186 | 81 | int x509write_csr_set_extension( x509write_csr *ctx, |
ansond | 0:137634ff4186 | 82 | const char *oid, size_t oid_len, |
ansond | 0:137634ff4186 | 83 | const unsigned char *val, size_t val_len ) |
ansond | 0:137634ff4186 | 84 | { |
ansond | 0:137634ff4186 | 85 | return x509_set_extension( &ctx->extensions, oid, oid_len, |
ansond | 0:137634ff4186 | 86 | 0, val, val_len ); |
ansond | 0:137634ff4186 | 87 | } |
ansond | 0:137634ff4186 | 88 | |
ansond | 0:137634ff4186 | 89 | int x509write_csr_set_key_usage( x509write_csr *ctx, unsigned char key_usage ) |
ansond | 0:137634ff4186 | 90 | { |
ansond | 0:137634ff4186 | 91 | unsigned char buf[4]; |
ansond | 0:137634ff4186 | 92 | unsigned char *c; |
ansond | 0:137634ff4186 | 93 | int ret; |
ansond | 0:137634ff4186 | 94 | |
ansond | 0:137634ff4186 | 95 | c = buf + 4; |
ansond | 0:137634ff4186 | 96 | |
ansond | 0:137634ff4186 | 97 | if( ( ret = asn1_write_bitstring( &c, buf, &key_usage, 7 ) ) != 4 ) |
ansond | 0:137634ff4186 | 98 | return( ret ); |
ansond | 0:137634ff4186 | 99 | |
ansond | 0:137634ff4186 | 100 | ret = x509write_csr_set_extension( ctx, OID_KEY_USAGE, |
ansond | 0:137634ff4186 | 101 | OID_SIZE( OID_KEY_USAGE ), |
ansond | 0:137634ff4186 | 102 | buf, 4 ); |
ansond | 0:137634ff4186 | 103 | if( ret != 0 ) |
ansond | 0:137634ff4186 | 104 | return( ret ); |
ansond | 0:137634ff4186 | 105 | |
ansond | 0:137634ff4186 | 106 | return( 0 ); |
ansond | 0:137634ff4186 | 107 | } |
ansond | 0:137634ff4186 | 108 | |
ansond | 0:137634ff4186 | 109 | int x509write_csr_set_ns_cert_type( x509write_csr *ctx, |
ansond | 0:137634ff4186 | 110 | unsigned char ns_cert_type ) |
ansond | 0:137634ff4186 | 111 | { |
ansond | 0:137634ff4186 | 112 | unsigned char buf[4]; |
ansond | 0:137634ff4186 | 113 | unsigned char *c; |
ansond | 0:137634ff4186 | 114 | int ret; |
ansond | 0:137634ff4186 | 115 | |
ansond | 0:137634ff4186 | 116 | c = buf + 4; |
ansond | 0:137634ff4186 | 117 | |
ansond | 0:137634ff4186 | 118 | if( ( ret = asn1_write_bitstring( &c, buf, &ns_cert_type, 8 ) ) != 4 ) |
ansond | 0:137634ff4186 | 119 | return( ret ); |
ansond | 0:137634ff4186 | 120 | |
ansond | 0:137634ff4186 | 121 | ret = x509write_csr_set_extension( ctx, OID_NS_CERT_TYPE, |
ansond | 0:137634ff4186 | 122 | OID_SIZE( OID_NS_CERT_TYPE ), |
ansond | 0:137634ff4186 | 123 | buf, 4 ); |
ansond | 0:137634ff4186 | 124 | if( ret != 0 ) |
ansond | 0:137634ff4186 | 125 | return( ret ); |
ansond | 0:137634ff4186 | 126 | |
ansond | 0:137634ff4186 | 127 | return( 0 ); |
ansond | 0:137634ff4186 | 128 | } |
ansond | 0:137634ff4186 | 129 | |
ansond | 0:137634ff4186 | 130 | int x509write_csr_der( x509write_csr *ctx, unsigned char *buf, size_t size, |
ansond | 0:137634ff4186 | 131 | int (*f_rng)(void *, unsigned char *, size_t), |
ansond | 0:137634ff4186 | 132 | void *p_rng ) |
ansond | 0:137634ff4186 | 133 | { |
ansond | 0:137634ff4186 | 134 | int ret; |
ansond | 0:137634ff4186 | 135 | const char *sig_oid; |
ansond | 0:137634ff4186 | 136 | size_t sig_oid_len = 0; |
ansond | 0:137634ff4186 | 137 | unsigned char *c, *c2; |
ansond | 0:137634ff4186 | 138 | unsigned char hash[64]; |
ansond | 0:137634ff4186 | 139 | unsigned char sig[POLARSSL_MPI_MAX_SIZE]; |
ansond | 0:137634ff4186 | 140 | unsigned char tmp_buf[2048]; |
ansond | 0:137634ff4186 | 141 | size_t pub_len = 0, sig_and_oid_len = 0, sig_len; |
ansond | 0:137634ff4186 | 142 | size_t len = 0; |
ansond | 0:137634ff4186 | 143 | pk_type_t pk_alg; |
ansond | 0:137634ff4186 | 144 | |
ansond | 0:137634ff4186 | 145 | /* |
ansond | 0:137634ff4186 | 146 | * Prepare data to be signed in tmp_buf |
ansond | 0:137634ff4186 | 147 | */ |
ansond | 0:137634ff4186 | 148 | c = tmp_buf + sizeof( tmp_buf ); |
ansond | 0:137634ff4186 | 149 | |
ansond | 0:137634ff4186 | 150 | ASN1_CHK_ADD( len, x509_write_extensions( &c, tmp_buf, ctx->extensions ) ); |
ansond | 0:137634ff4186 | 151 | |
ansond | 0:137634ff4186 | 152 | if( len ) |
ansond | 0:137634ff4186 | 153 | { |
ansond | 0:137634ff4186 | 154 | ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, len ) ); |
ansond | 0:137634ff4186 | 155 | ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | |
ansond | 0:137634ff4186 | 156 | ASN1_SEQUENCE ) ); |
ansond | 0:137634ff4186 | 157 | |
ansond | 0:137634ff4186 | 158 | ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, len ) ); |
ansond | 0:137634ff4186 | 159 | ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | |
ansond | 0:137634ff4186 | 160 | ASN1_SET ) ); |
ansond | 0:137634ff4186 | 161 | |
ansond | 0:137634ff4186 | 162 | ASN1_CHK_ADD( len, asn1_write_oid( &c, tmp_buf, OID_PKCS9_CSR_EXT_REQ, |
ansond | 0:137634ff4186 | 163 | OID_SIZE( OID_PKCS9_CSR_EXT_REQ ) ) ); |
ansond | 0:137634ff4186 | 164 | |
ansond | 0:137634ff4186 | 165 | ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, len ) ); |
ansond | 0:137634ff4186 | 166 | ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | |
ansond | 0:137634ff4186 | 167 | ASN1_SEQUENCE ) ); |
ansond | 0:137634ff4186 | 168 | } |
ansond | 0:137634ff4186 | 169 | |
ansond | 0:137634ff4186 | 170 | ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, len ) ); |
ansond | 0:137634ff4186 | 171 | ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | |
ansond | 0:137634ff4186 | 172 | ASN1_CONTEXT_SPECIFIC ) ); |
ansond | 0:137634ff4186 | 173 | |
ansond | 0:137634ff4186 | 174 | ASN1_CHK_ADD( pub_len, pk_write_pubkey_der( ctx->key, |
ansond | 0:137634ff4186 | 175 | tmp_buf, c - tmp_buf ) ); |
ansond | 0:137634ff4186 | 176 | c -= pub_len; |
ansond | 0:137634ff4186 | 177 | len += pub_len; |
ansond | 0:137634ff4186 | 178 | |
ansond | 0:137634ff4186 | 179 | /* |
ansond | 0:137634ff4186 | 180 | * Subject ::= Name |
ansond | 0:137634ff4186 | 181 | */ |
ansond | 0:137634ff4186 | 182 | ASN1_CHK_ADD( len, x509_write_names( &c, tmp_buf, ctx->subject ) ); |
ansond | 0:137634ff4186 | 183 | |
ansond | 0:137634ff4186 | 184 | /* |
ansond | 0:137634ff4186 | 185 | * Version ::= INTEGER { v1(0), v2(1), v3(2) } |
ansond | 0:137634ff4186 | 186 | */ |
ansond | 0:137634ff4186 | 187 | ASN1_CHK_ADD( len, asn1_write_int( &c, tmp_buf, 0 ) ); |
ansond | 0:137634ff4186 | 188 | |
ansond | 0:137634ff4186 | 189 | ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, len ) ); |
ansond | 0:137634ff4186 | 190 | ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | |
ansond | 0:137634ff4186 | 191 | ASN1_SEQUENCE ) ); |
ansond | 0:137634ff4186 | 192 | |
ansond | 0:137634ff4186 | 193 | /* |
ansond | 0:137634ff4186 | 194 | * Prepare signature |
ansond | 0:137634ff4186 | 195 | */ |
ansond | 0:137634ff4186 | 196 | md( md_info_from_type( ctx->md_alg ), c, len, hash ); |
ansond | 0:137634ff4186 | 197 | |
ansond | 0:137634ff4186 | 198 | pk_alg = pk_get_type( ctx->key ); |
ansond | 0:137634ff4186 | 199 | if( pk_alg == POLARSSL_PK_ECKEY ) |
ansond | 0:137634ff4186 | 200 | pk_alg = POLARSSL_PK_ECDSA; |
ansond | 0:137634ff4186 | 201 | |
ansond | 0:137634ff4186 | 202 | if( ( ret = pk_sign( ctx->key, ctx->md_alg, hash, 0, sig, &sig_len, |
ansond | 0:137634ff4186 | 203 | f_rng, p_rng ) ) != 0 || |
ansond | 0:137634ff4186 | 204 | ( ret = oid_get_oid_by_sig_alg( pk_alg, ctx->md_alg, |
ansond | 0:137634ff4186 | 205 | &sig_oid, &sig_oid_len ) ) != 0 ) |
ansond | 0:137634ff4186 | 206 | { |
ansond | 0:137634ff4186 | 207 | return( ret ); |
ansond | 0:137634ff4186 | 208 | } |
ansond | 0:137634ff4186 | 209 | |
ansond | 0:137634ff4186 | 210 | /* |
ansond | 0:137634ff4186 | 211 | * Write data to output buffer |
ansond | 0:137634ff4186 | 212 | */ |
ansond | 0:137634ff4186 | 213 | c2 = buf + size; |
ansond | 0:137634ff4186 | 214 | ASN1_CHK_ADD( sig_and_oid_len, x509_write_sig( &c2, buf, |
ansond | 0:137634ff4186 | 215 | sig_oid, sig_oid_len, sig, sig_len ) ); |
ansond | 0:137634ff4186 | 216 | |
ansond | 0:137634ff4186 | 217 | c2 -= len; |
ansond | 0:137634ff4186 | 218 | memcpy( c2, c, len ); |
ansond | 0:137634ff4186 | 219 | |
ansond | 0:137634ff4186 | 220 | len += sig_and_oid_len; |
ansond | 0:137634ff4186 | 221 | ASN1_CHK_ADD( len, asn1_write_len( &c2, buf, len ) ); |
ansond | 0:137634ff4186 | 222 | ASN1_CHK_ADD( len, asn1_write_tag( &c2, buf, ASN1_CONSTRUCTED | |
ansond | 0:137634ff4186 | 223 | ASN1_SEQUENCE ) ); |
ansond | 0:137634ff4186 | 224 | |
ansond | 0:137634ff4186 | 225 | return( (int) len ); |
ansond | 0:137634ff4186 | 226 | } |
ansond | 0:137634ff4186 | 227 | |
ansond | 0:137634ff4186 | 228 | #define PEM_BEGIN_CSR "-----BEGIN CERTIFICATE REQUEST-----\n" |
ansond | 0:137634ff4186 | 229 | #define PEM_END_CSR "-----END CERTIFICATE REQUEST-----\n" |
ansond | 0:137634ff4186 | 230 | |
ansond | 0:137634ff4186 | 231 | #if defined(POLARSSL_PEM_WRITE_C) |
ansond | 0:137634ff4186 | 232 | int x509write_csr_pem( x509write_csr *ctx, unsigned char *buf, size_t size, |
ansond | 0:137634ff4186 | 233 | int (*f_rng)(void *, unsigned char *, size_t), |
ansond | 0:137634ff4186 | 234 | void *p_rng ) |
ansond | 0:137634ff4186 | 235 | { |
ansond | 0:137634ff4186 | 236 | int ret; |
ansond | 0:137634ff4186 | 237 | unsigned char output_buf[4096]; |
ansond | 0:137634ff4186 | 238 | size_t olen = 0; |
ansond | 0:137634ff4186 | 239 | |
ansond | 0:137634ff4186 | 240 | if( ( ret = x509write_csr_der( ctx, output_buf, sizeof(output_buf), |
ansond | 0:137634ff4186 | 241 | f_rng, p_rng ) ) < 0 ) |
ansond | 0:137634ff4186 | 242 | { |
ansond | 0:137634ff4186 | 243 | return( ret ); |
ansond | 0:137634ff4186 | 244 | } |
ansond | 0:137634ff4186 | 245 | |
ansond | 0:137634ff4186 | 246 | if( ( ret = pem_write_buffer( PEM_BEGIN_CSR, PEM_END_CSR, |
ansond | 0:137634ff4186 | 247 | output_buf + sizeof(output_buf) - ret, |
ansond | 0:137634ff4186 | 248 | ret, buf, size, &olen ) ) != 0 ) |
ansond | 0:137634ff4186 | 249 | { |
ansond | 0:137634ff4186 | 250 | return( ret ); |
ansond | 0:137634ff4186 | 251 | } |
ansond | 0:137634ff4186 | 252 | |
ansond | 0:137634ff4186 | 253 | return( 0 ); |
ansond | 0:137634ff4186 | 254 | } |
ansond | 0:137634ff4186 | 255 | #endif /* POLARSSL_PEM_WRITE_C */ |
ansond | 0:137634ff4186 | 256 | |
ansond | 0:137634ff4186 | 257 | #endif /* POLARSSL_X509_CSR_WRITE_C */ |
ansond | 0:137634ff4186 | 258 |