1 /* v3_conf.c */ 2 /* Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL 3 * project 1999. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 1999-2002 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * licensing (at) OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay (at) cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh (at) cryptsoft.com). */ 56 57 /* extension creation utilities */ 58 59 #include <ctype.h> 60 #include <stdio.h> 61 #include <string.h> 62 63 #include <openssl/conf.h> 64 #include <openssl/err.h> 65 #include <openssl/mem.h> 66 #include <openssl/obj.h> 67 #include <openssl/x509.h> 68 #include <openssl/x509v3.h> 69 70 #include "../internal.h" 71 72 73 static int v3_check_critical(char **value); 74 static int v3_check_generic(char **value); 75 static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid, int crit, char *value); 76 static X509_EXTENSION *v3_generic_extension(const char *ext, char *value, int crit, int type, X509V3_CTX *ctx); 77 static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, int ext_nid, 78 int crit, void *ext_struc); 79 static unsigned char *generic_asn1(char *value, X509V3_CTX *ctx, long *ext_len); 80 /* CONF *conf: Config file */ 81 /* char *name: Name */ 82 /* char *value: Value */ 83 X509_EXTENSION *X509V3_EXT_nconf(CONF *conf, X509V3_CTX *ctx, char *name, 84 char *value) 85 { 86 int crit; 87 int ext_type; 88 X509_EXTENSION *ret; 89 crit = v3_check_critical(&value); 90 if ((ext_type = v3_check_generic(&value))) 91 return v3_generic_extension(name, value, crit, ext_type, ctx); 92 ret = do_ext_nconf(conf, ctx, OBJ_sn2nid(name), crit, value); 93 if (!ret) 94 { 95 OPENSSL_PUT_ERROR(X509V3, X509V3_R_ERROR_IN_EXTENSION); 96 ERR_add_error_data(4,"name=", name, ", value=", value); 97 } 98 return ret; 99 } 100 101 /* CONF *conf: Config file */ 102 /* char *value: Value */ 103 X509_EXTENSION *X509V3_EXT_nconf_nid(CONF *conf, X509V3_CTX *ctx, int ext_nid, 104 char *value) 105 { 106 int crit; 107 int ext_type; 108 crit = v3_check_critical(&value); 109 if ((ext_type = v3_check_generic(&value))) 110 return v3_generic_extension(OBJ_nid2sn(ext_nid), 111 value, crit, ext_type, ctx); 112 return do_ext_nconf(conf, ctx, ext_nid, crit, value); 113 } 114 115 /* CONF *conf: Config file */ 116 /* char *value: Value */ 117 static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid, 118 int crit, char *value) 119 { 120 const X509V3_EXT_METHOD *method; 121 X509_EXTENSION *ext; 122 STACK_OF(CONF_VALUE) *nval; 123 void *ext_struc; 124 if (ext_nid == NID_undef) 125 { 126 OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNKNOWN_EXTENSION_NAME); 127 return NULL; 128 } 129 if (!(method = X509V3_EXT_get_nid(ext_nid))) 130 { 131 OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNKNOWN_EXTENSION); 132 return NULL; 133 } 134 /* Now get internal extension representation based on type */ 135 if (method->v2i) 136 { 137 if(*value == '@') nval = NCONF_get_section(conf, value + 1); 138 else nval = X509V3_parse_list(value); 139 if(sk_CONF_VALUE_num(nval) <= 0) 140 { 141 OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_EXTENSION_STRING); 142 ERR_add_error_data(4, "name=", OBJ_nid2sn(ext_nid), ",section=", value); 143 return NULL; 144 } 145 ext_struc = method->v2i(method, ctx, nval); 146 if(*value != '@') sk_CONF_VALUE_pop_free(nval, 147 X509V3_conf_free); 148 if(!ext_struc) return NULL; 149 } 150 else if(method->s2i) 151 { 152 if(!(ext_struc = method->s2i(method, ctx, value))) return NULL; 153 } 154 else if(method->r2i) 155 { 156 if(!ctx->db || !ctx->db_meth) 157 { 158 OPENSSL_PUT_ERROR(X509V3, X509V3_R_NO_CONFIG_DATABASE); 159 return NULL; 160 } 161 if(!(ext_struc = method->r2i(method, ctx, value))) return NULL; 162 } 163 else 164 { 165 OPENSSL_PUT_ERROR(X509V3, X509V3_R_EXTENSION_SETTING_NOT_SUPPORTED); 166 ERR_add_error_data(2, "name=", OBJ_nid2sn(ext_nid)); 167 return NULL; 168 } 169 170 ext = do_ext_i2d(method, ext_nid, crit, ext_struc); 171 if(method->it) ASN1_item_free(ext_struc, ASN1_ITEM_ptr(method->it)); 172 else method->ext_free(ext_struc); 173 return ext; 174 175 } 176 177 static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, int ext_nid, 178 int crit, void *ext_struc) 179 { 180 unsigned char *ext_der; 181 int ext_len; 182 ASN1_OCTET_STRING *ext_oct; 183 X509_EXTENSION *ext; 184 /* Convert internal representation to DER */ 185 if (method->it) 186 { 187 ext_der = NULL; 188 ext_len = ASN1_item_i2d(ext_struc, &ext_der, ASN1_ITEM_ptr(method->it)); 189 if (ext_len < 0) goto merr; 190 } 191 else 192 { 193 unsigned char *p; 194 ext_len = method->i2d(ext_struc, NULL); 195 if(!(ext_der = OPENSSL_malloc(ext_len))) goto merr; 196 p = ext_der; 197 method->i2d(ext_struc, &p); 198 } 199 if (!(ext_oct = M_ASN1_OCTET_STRING_new())) goto merr; 200 ext_oct->data = ext_der; 201 ext_oct->length = ext_len; 202 203 ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct); 204 if (!ext) goto merr; 205 M_ASN1_OCTET_STRING_free(ext_oct); 206 207 return ext; 208 209 merr: 210 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE); 211 return NULL; 212 213 } 214 215 /* Given an internal structure, nid and critical flag create an extension */ 216 217 X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc) 218 { 219 const X509V3_EXT_METHOD *method; 220 if (!(method = X509V3_EXT_get_nid(ext_nid))) { 221 OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNKNOWN_EXTENSION); 222 return NULL; 223 } 224 return do_ext_i2d(method, ext_nid, crit, ext_struc); 225 } 226 227 /* Check the extension string for critical flag */ 228 static int v3_check_critical(char **value) 229 { 230 char *p = *value; 231 if ((strlen(p) < 9) || strncmp(p, "critical,", 9)) return 0; 232 p+=9; 233 while(isspace((unsigned char)*p)) p++; 234 *value = p; 235 return 1; 236 } 237 238 /* Check extension string for generic extension and return the type */ 239 static int v3_check_generic(char **value) 240 { 241 int gen_type = 0; 242 char *p = *value; 243 if ((strlen(p) >= 4) && !strncmp(p, "DER:", 4)) 244 { 245 p+=4; 246 gen_type = 1; 247 } 248 else if ((strlen(p) >= 5) && !strncmp(p, "ASN1:", 5)) 249 { 250 p+=5; 251 gen_type = 2; 252 } 253 else 254 return 0; 255 256 while (isspace((unsigned char)*p)) p++; 257 *value = p; 258 return gen_type; 259 } 260 261 /* Create a generic extension: for now just handle DER type */ 262 static X509_EXTENSION *v3_generic_extension(const char *ext, char *value, 263 int crit, int gen_type, 264 X509V3_CTX *ctx) 265 OPENSSL_SUPPRESS_POTENTIALLY_UNINITIALIZED_WARNINGS 266 { 267 unsigned char *ext_der=NULL; 268 long ext_len; 269 ASN1_OBJECT *obj=NULL; 270 ASN1_OCTET_STRING *oct=NULL; 271 X509_EXTENSION *extension=NULL; 272 if (!(obj = OBJ_txt2obj(ext, 0))) 273 { 274 OPENSSL_PUT_ERROR(X509V3, X509V3_R_EXTENSION_NAME_ERROR); 275 ERR_add_error_data(2, "name=", ext); 276 goto err; 277 } 278 279 if (gen_type == 1) 280 ext_der = string_to_hex(value, &ext_len); 281 else if (gen_type == 2) 282 ext_der = generic_asn1(value, ctx, &ext_len); 283 284 if (ext_der == NULL) 285 { 286 OPENSSL_PUT_ERROR(X509V3, X509V3_R_EXTENSION_VALUE_ERROR); 287 ERR_add_error_data(2, "value=", value); 288 goto err; 289 } 290 291 if (!(oct = M_ASN1_OCTET_STRING_new())) 292 { 293 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE); 294 goto err; 295 } 296 297 oct->data = ext_der; 298 oct->length = ext_len; 299 ext_der = NULL; 300 301 extension = X509_EXTENSION_create_by_OBJ(NULL, obj, crit, oct); 302 303 err: 304 ASN1_OBJECT_free(obj); 305 M_ASN1_OCTET_STRING_free(oct); 306 if(ext_der) OPENSSL_free(ext_der); 307 return extension; 308 309 } 310 311 static unsigned char *generic_asn1(char *value, X509V3_CTX *ctx, long *ext_len) 312 { 313 ASN1_TYPE *typ; 314 unsigned char *ext_der = NULL; 315 typ = ASN1_generate_v3(value, ctx); 316 if (typ == NULL) 317 return NULL; 318 *ext_len = i2d_ASN1_TYPE(typ, &ext_der); 319 ASN1_TYPE_free(typ); 320 return ext_der; 321 } 322 323 /* This is the main function: add a bunch of extensions based on a config file 324 * section to an extension STACK. 325 */ 326 327 328 int X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, char *section, 329 STACK_OF(X509_EXTENSION) **sk) 330 { 331 X509_EXTENSION *ext; 332 STACK_OF(CONF_VALUE) *nval; 333 CONF_VALUE *val; 334 size_t i; 335 if (!(nval = NCONF_get_section(conf, section))) return 0; 336 for (i = 0; i < sk_CONF_VALUE_num(nval); i++) 337 { 338 val = sk_CONF_VALUE_value(nval, i); 339 if (!(ext = X509V3_EXT_nconf(conf, ctx, val->name, val->value))) 340 return 0; 341 if (sk) X509v3_add_ext(sk, ext, -1); 342 X509_EXTENSION_free(ext); 343 } 344 return 1; 345 } 346 347 /* Convenience functions to add extensions to a certificate, CRL and request */ 348 349 int X509V3_EXT_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section, 350 X509 *cert) 351 { 352 STACK_OF(X509_EXTENSION) **sk = NULL; 353 if (cert) 354 sk = &cert->cert_info->extensions; 355 return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); 356 } 357 358 /* Same as above but for a CRL */ 359 360 int X509V3_EXT_CRL_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section, 361 X509_CRL *crl) 362 { 363 STACK_OF(X509_EXTENSION) **sk = NULL; 364 if (crl) 365 sk = &crl->crl->extensions; 366 return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); 367 } 368 369 /* Add extensions to certificate request */ 370 371 int X509V3_EXT_REQ_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section, 372 X509_REQ *req) 373 { 374 STACK_OF(X509_EXTENSION) *extlist = NULL, **sk = NULL; 375 int i; 376 if (req) 377 sk = &extlist; 378 i = X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); 379 if (!i || !sk) 380 return i; 381 i = X509_REQ_add_extensions(req, extlist); 382 sk_X509_EXTENSION_pop_free(extlist, X509_EXTENSION_free); 383 return i; 384 } 385 386 /* Config database functions */ 387 388 char * X509V3_get_string(X509V3_CTX *ctx, char *name, char *section) 389 { 390 if(!ctx->db || !ctx->db_meth || !ctx->db_meth->get_string) 391 { 392 OPENSSL_PUT_ERROR(X509V3, X509V3_R_OPERATION_NOT_DEFINED); 393 return NULL; 394 } 395 if (ctx->db_meth->get_string) 396 return ctx->db_meth->get_string(ctx->db, name, section); 397 return NULL; 398 } 399 400 STACK_OF(CONF_VALUE) * X509V3_get_section(X509V3_CTX *ctx, char *section) 401 { 402 if(!ctx->db || !ctx->db_meth || !ctx->db_meth->get_section) 403 { 404 OPENSSL_PUT_ERROR(X509V3, X509V3_R_OPERATION_NOT_DEFINED); 405 return NULL; 406 } 407 if (ctx->db_meth->get_section) 408 return ctx->db_meth->get_section(ctx->db, section); 409 return NULL; 410 } 411 412 void X509V3_string_free(X509V3_CTX *ctx, char *str) 413 { 414 if (!str) return; 415 if (ctx->db_meth->free_string) 416 ctx->db_meth->free_string(ctx->db, str); 417 } 418 419 void X509V3_section_free(X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *section) 420 { 421 if (!section) return; 422 if (ctx->db_meth->free_section) 423 ctx->db_meth->free_section(ctx->db, section); 424 } 425 426 static char *nconf_get_string(void *db, char *section, char *value) 427 { 428 /* TODO(fork): this should return a const value. */ 429 return (char *) NCONF_get_string(db, section, value); 430 } 431 432 static STACK_OF(CONF_VALUE) *nconf_get_section(void *db, char *section) 433 { 434 return NCONF_get_section(db, section); 435 } 436 437 static const X509V3_CONF_METHOD nconf_method = { 438 nconf_get_string, 439 nconf_get_section, 440 NULL, 441 NULL 442 }; 443 444 void X509V3_set_nconf(X509V3_CTX *ctx, CONF *conf) 445 { 446 ctx->db_meth = &nconf_method; 447 ctx->db = conf; 448 } 449 450 void X509V3_set_ctx(X509V3_CTX *ctx, X509 *issuer, X509 *subj, X509_REQ *req, 451 X509_CRL *crl, int flags) 452 { 453 ctx->issuer_cert = issuer; 454 ctx->subject_cert = subj; 455 ctx->crl = crl; 456 ctx->subject_req = req; 457 ctx->flags = flags; 458 } 459 460
