1 // SPDX-License-Identifier: Apache-2.0 2 /* 3 * X.509 base functions for creating certificates / CSRs 4 * 5 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved 6 * 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may 8 * not use this file except in compliance with the License. 9 * You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, software 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 * See the License for the specific language governing permissions and 17 * limitations under the License. 18 * 19 * This file is part of mbed TLS (https://tls.mbed.org) 20 */ 21 22 #if !defined(MBEDTLS_CONFIG_FILE) 23 #include "mbedtls/config.h" 24 #else 25 #include MBEDTLS_CONFIG_FILE 26 #endif 27 28 #if defined(MBEDTLS_X509_CREATE_C) 29 30 #include "mbedtls/x509.h" 31 #include "mbedtls/asn1write.h" 32 #include "mbedtls/oid.h" 33 34 #include <string.h> 35 36 typedef struct { 37 const char *name; 38 size_t name_len; 39 const char*oid; 40 } x509_attr_descriptor_t; 41 42 #define ADD_STRLEN( s ) s, sizeof( s ) - 1 43 44 static const x509_attr_descriptor_t x509_attrs[] = 45 { 46 { ADD_STRLEN( "CN" ), MBEDTLS_OID_AT_CN }, 47 { ADD_STRLEN( "commonName" ), MBEDTLS_OID_AT_CN }, 48 { ADD_STRLEN( "C" ), MBEDTLS_OID_AT_COUNTRY }, 49 { ADD_STRLEN( "countryName" ), MBEDTLS_OID_AT_COUNTRY }, 50 { ADD_STRLEN( "O" ), MBEDTLS_OID_AT_ORGANIZATION }, 51 { ADD_STRLEN( "organizationName" ), MBEDTLS_OID_AT_ORGANIZATION }, 52 { ADD_STRLEN( "L" ), MBEDTLS_OID_AT_LOCALITY }, 53 { ADD_STRLEN( "locality" ), MBEDTLS_OID_AT_LOCALITY }, 54 { ADD_STRLEN( "R" ), MBEDTLS_OID_PKCS9_EMAIL }, 55 { ADD_STRLEN( "OU" ), MBEDTLS_OID_AT_ORG_UNIT }, 56 { ADD_STRLEN( "organizationalUnitName" ), MBEDTLS_OID_AT_ORG_UNIT }, 57 { ADD_STRLEN( "ST" ), MBEDTLS_OID_AT_STATE }, 58 { ADD_STRLEN( "stateOrProvinceName" ), MBEDTLS_OID_AT_STATE }, 59 { ADD_STRLEN( "emailAddress" ), MBEDTLS_OID_PKCS9_EMAIL }, 60 { ADD_STRLEN( "serialNumber" ), MBEDTLS_OID_AT_SERIAL_NUMBER }, 61 { ADD_STRLEN( "postalAddress" ), MBEDTLS_OID_AT_POSTAL_ADDRESS }, 62 { ADD_STRLEN( "postalCode" ), MBEDTLS_OID_AT_POSTAL_CODE }, 63 { ADD_STRLEN( "dnQualifier" ), MBEDTLS_OID_AT_DN_QUALIFIER }, 64 { ADD_STRLEN( "title" ), MBEDTLS_OID_AT_TITLE }, 65 { ADD_STRLEN( "surName" ), MBEDTLS_OID_AT_SUR_NAME }, 66 { ADD_STRLEN( "SN" ), MBEDTLS_OID_AT_SUR_NAME }, 67 { ADD_STRLEN( "givenName" ), MBEDTLS_OID_AT_GIVEN_NAME }, 68 { ADD_STRLEN( "GN" ), MBEDTLS_OID_AT_GIVEN_NAME }, 69 { ADD_STRLEN( "initials" ), MBEDTLS_OID_AT_INITIALS }, 70 { ADD_STRLEN( "pseudonym" ), MBEDTLS_OID_AT_PSEUDONYM }, 71 { ADD_STRLEN( "generationQualifier" ), MBEDTLS_OID_AT_GENERATION_QUALIFIER }, 72 { ADD_STRLEN( "domainComponent" ), MBEDTLS_OID_DOMAIN_COMPONENT }, 73 { ADD_STRLEN( "DC" ), MBEDTLS_OID_DOMAIN_COMPONENT }, 74 { NULL, 0, NULL } 75 }; 76 77 static const char *x509_at_oid_from_name( const char *name, size_t name_len ) 78 { 79 const x509_attr_descriptor_t *cur; 80 81 for( cur = x509_attrs; cur->name != NULL; cur++ ) 82 if( cur->name_len == name_len && 83 strncmp( cur->name, name, name_len ) == 0 ) 84 break; 85 86 return( cur->oid ); 87 } 88 89 int mbedtls_x509_string_to_names( mbedtls_asn1_named_data **head, const char *name ) 90 { 91 int ret = 0; 92 const char *s = name, *c = s; 93 const char *end = s + strlen( s ); 94 const char *oid = NULL; 95 int in_tag = 1; 96 char data[MBEDTLS_X509_MAX_DN_NAME_SIZE]; 97 char *d = data; 98 99 /* Clear existing chain if present */ 100 mbedtls_asn1_free_named_data_list( head ); 101 102 while( c <= end ) 103 { 104 if( in_tag && *c == '=' ) 105 { 106 if( ( oid = x509_at_oid_from_name( s, c - s ) ) == NULL ) 107 { 108 ret = MBEDTLS_ERR_X509_UNKNOWN_OID; 109 goto exit; 110 } 111 112 s = c + 1; 113 in_tag = 0; 114 d = data; 115 } 116 117 if( !in_tag && *c == '\\' && c != end ) 118 { 119 c++; 120 121 /* Check for valid escaped characters */ 122 if( c == end || *c != ',' ) 123 { 124 ret = MBEDTLS_ERR_X509_INVALID_NAME; 125 goto exit; 126 } 127 } 128 else if( !in_tag && ( *c == ',' || c == end ) ) 129 { 130 if( mbedtls_asn1_store_named_data( head, oid, strlen( oid ), 131 (unsigned char *) data, 132 d - data ) == NULL ) 133 { 134 return( MBEDTLS_ERR_X509_ALLOC_FAILED ); 135 } 136 137 while( c < end && *(c + 1) == ' ' ) 138 c++; 139 140 s = c + 1; 141 in_tag = 1; 142 } 143 144 if( !in_tag && s != c + 1 ) 145 { 146 *(d++) = *c; 147 148 if( d - data == MBEDTLS_X509_MAX_DN_NAME_SIZE ) 149 { 150 ret = MBEDTLS_ERR_X509_INVALID_NAME; 151 goto exit; 152 } 153 } 154 155 c++; 156 } 157 158 exit: 159 160 return( ret ); 161 } 162 163 /* The first byte of the value in the mbedtls_asn1_named_data structure is reserved 164 * to store the critical boolean for us 165 */ 166 int mbedtls_x509_set_extension( mbedtls_asn1_named_data **head, const char *oid, size_t oid_len, 167 int critical, const unsigned char *val, size_t val_len ) 168 { 169 mbedtls_asn1_named_data *cur; 170 171 if( ( cur = mbedtls_asn1_store_named_data( head, oid, oid_len, 172 NULL, val_len + 1 ) ) == NULL ) 173 { 174 return( MBEDTLS_ERR_X509_ALLOC_FAILED ); 175 } 176 177 cur->val.p[0] = critical; 178 memcpy( cur->val.p + 1, val, val_len ); 179 180 return( 0 ); 181 } 182 183 /* 184 * RelativeDistinguishedName ::= 185 * SET OF AttributeTypeAndValue 186 * 187 * AttributeTypeAndValue ::= SEQUENCE { 188 * type AttributeType, 189 * value AttributeValue } 190 * 191 * AttributeType ::= OBJECT IDENTIFIER 192 * 193 * AttributeValue ::= ANY DEFINED BY AttributeType 194 */ 195 static int x509_write_name( unsigned char **p, unsigned char *start, 196 const char *oid, size_t oid_len, 197 const unsigned char *name, size_t name_len ) 198 { 199 int ret; 200 size_t len = 0; 201 202 // Write PrintableString for all except MBEDTLS_OID_PKCS9_EMAIL 203 // 204 if( MBEDTLS_OID_SIZE( MBEDTLS_OID_PKCS9_EMAIL ) == oid_len && 205 memcmp( oid, MBEDTLS_OID_PKCS9_EMAIL, oid_len ) == 0 ) 206 { 207 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_ia5_string( p, start, 208 (const char *) name, 209 name_len ) ); 210 } 211 else 212 { 213 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_printable_string( p, start, 214 (const char *) name, 215 name_len ) ); 216 } 217 218 // Write OID 219 // 220 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( p, start, oid, oid_len ) ); 221 222 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) ); 223 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED | 224 MBEDTLS_ASN1_SEQUENCE ) ); 225 226 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) ); 227 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED | 228 MBEDTLS_ASN1_SET ) ); 229 230 return( (int) len ); 231 } 232 233 int mbedtls_x509_write_names( unsigned char **p, unsigned char *start, 234 mbedtls_asn1_named_data *first ) 235 { 236 int ret; 237 size_t len = 0; 238 mbedtls_asn1_named_data *cur = first; 239 240 while( cur != NULL ) 241 { 242 MBEDTLS_ASN1_CHK_ADD( len, x509_write_name( p, start, (char *) cur->oid.p, 243 cur->oid.len, 244 cur->val.p, cur->val.len ) ); 245 cur = cur->next; 246 } 247 248 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) ); 249 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED | 250 MBEDTLS_ASN1_SEQUENCE ) ); 251 252 return( (int) len ); 253 } 254 255 int mbedtls_x509_write_sig( unsigned char **p, unsigned char *start, 256 const char *oid, size_t oid_len, 257 unsigned char *sig, size_t size ) 258 { 259 int ret; 260 size_t len = 0; 261 262 if( *p < start || (size_t)( *p - start ) < size ) 263 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL ); 264 265 len = size; 266 (*p) -= len; 267 memcpy( *p, sig, len ); 268 269 if( *p - start < 1 ) 270 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL ); 271 272 *--(*p) = 0; 273 len += 1; 274 275 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) ); 276 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_BIT_STRING ) ); 277 278 // Write OID 279 // 280 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier( p, start, oid, 281 oid_len, 0 ) ); 282 283 return( (int) len ); 284 } 285 286 static int x509_write_extension( unsigned char **p, unsigned char *start, 287 mbedtls_asn1_named_data *ext ) 288 { 289 int ret; 290 size_t len = 0; 291 292 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start, ext->val.p + 1, 293 ext->val.len - 1 ) ); 294 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, ext->val.len - 1 ) ); 295 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_OCTET_STRING ) ); 296 297 if( ext->val.p[0] != 0 ) 298 { 299 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_bool( p, start, 1 ) ); 300 } 301 302 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start, ext->oid.p, 303 ext->oid.len ) ); 304 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, ext->oid.len ) ); 305 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_OID ) ); 306 307 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) ); 308 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED | 309 MBEDTLS_ASN1_SEQUENCE ) ); 310 311 return( (int) len ); 312 } 313 314 /* 315 * Extension ::= SEQUENCE { 316 * extnID OBJECT IDENTIFIER, 317 * critical BOOLEAN DEFAULT FALSE, 318 * extnValue OCTET STRING 319 * -- contains the DER encoding of an ASN.1 value 320 * -- corresponding to the extension type identified 321 * -- by extnID 322 * } 323 */ 324 int mbedtls_x509_write_extensions( unsigned char **p, unsigned char *start, 325 mbedtls_asn1_named_data *first ) 326 { 327 int ret; 328 size_t len = 0; 329 mbedtls_asn1_named_data *cur_ext = first; 330 331 while( cur_ext != NULL ) 332 { 333 MBEDTLS_ASN1_CHK_ADD( len, x509_write_extension( p, start, cur_ext ) ); 334 cur_ext = cur_ext->next; 335 } 336 337 return( (int) len ); 338 } 339 340 #endif /* MBEDTLS_X509_CREATE_C */ 341