1/* v3_conf.c */ 2/* Written by Dr Stephen N Henson (steve@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@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@cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh@cryptsoft.com). */ 56 57/* extension creation utilities */ 58 59#include <stdio.h> 60#include <ctype.h> 61 62#include <openssl/conf.h> 63#include <openssl/err.h> 64#include <openssl/mem.h> 65#include <openssl/obj.h> 66#include <openssl/x509.h> 67#include <openssl/x509v3.h> 68 69 70static int v3_check_critical(char **value); 71static int v3_check_generic(char **value); 72static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid, int crit, char *value); 73static X509_EXTENSION *v3_generic_extension(const char *ext, char *value, int crit, int type, X509V3_CTX *ctx); 74static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, int ext_nid, 75 int crit, void *ext_struc); 76static unsigned char *generic_asn1(char *value, X509V3_CTX *ctx, long *ext_len); 77/* CONF *conf: Config file */ 78/* char *name: Name */ 79/* char *value: Value */ 80X509_EXTENSION *X509V3_EXT_nconf(CONF *conf, X509V3_CTX *ctx, char *name, 81 char *value) 82 { 83 int crit; 84 int ext_type; 85 X509_EXTENSION *ret; 86 crit = v3_check_critical(&value); 87 if ((ext_type = v3_check_generic(&value))) 88 return v3_generic_extension(name, value, crit, ext_type, ctx); 89 ret = do_ext_nconf(conf, ctx, OBJ_sn2nid(name), crit, value); 90 if (!ret) 91 { 92 OPENSSL_PUT_ERROR(X509V3, X509V3_EXT_nconf, X509V3_R_ERROR_IN_EXTENSION); 93 ERR_add_error_data(4,"name=", name, ", value=", value); 94 } 95 return ret; 96 } 97 98/* CONF *conf: Config file */ 99/* char *value: Value */ 100X509_EXTENSION *X509V3_EXT_nconf_nid(CONF *conf, X509V3_CTX *ctx, int ext_nid, 101 char *value) 102 { 103 int crit; 104 int ext_type; 105 crit = v3_check_critical(&value); 106 if ((ext_type = v3_check_generic(&value))) 107 return v3_generic_extension(OBJ_nid2sn(ext_nid), 108 value, crit, ext_type, ctx); 109 return do_ext_nconf(conf, ctx, ext_nid, crit, value); 110 } 111 112/* CONF *conf: Config file */ 113/* char *value: Value */ 114static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid, 115 int crit, char *value) 116 { 117 const X509V3_EXT_METHOD *method; 118 X509_EXTENSION *ext; 119 STACK_OF(CONF_VALUE) *nval; 120 void *ext_struc; 121 if (ext_nid == NID_undef) 122 { 123 OPENSSL_PUT_ERROR(X509V3, do_ext_nconf, X509V3_R_UNKNOWN_EXTENSION_NAME); 124 return NULL; 125 } 126 if (!(method = X509V3_EXT_get_nid(ext_nid))) 127 { 128 OPENSSL_PUT_ERROR(X509V3, do_ext_nconf, X509V3_R_UNKNOWN_EXTENSION); 129 return NULL; 130 } 131 /* Now get internal extension representation based on type */ 132 if (method->v2i) 133 { 134 if(*value == '@') nval = NCONF_get_section(conf, value + 1); 135 else nval = X509V3_parse_list(value); 136 if(sk_CONF_VALUE_num(nval) <= 0) 137 { 138 OPENSSL_PUT_ERROR(X509V3, do_ext_nconf, X509V3_R_INVALID_EXTENSION_STRING); 139 ERR_add_error_data(4, "name=", OBJ_nid2sn(ext_nid), ",section=", value); 140 return NULL; 141 } 142 ext_struc = method->v2i(method, ctx, nval); 143 if(*value != '@') sk_CONF_VALUE_pop_free(nval, 144 X509V3_conf_free); 145 if(!ext_struc) return NULL; 146 } 147 else if(method->s2i) 148 { 149 if(!(ext_struc = method->s2i(method, ctx, value))) return NULL; 150 } 151 else if(method->r2i) 152 { 153 if(!ctx->db || !ctx->db_meth) 154 { 155 OPENSSL_PUT_ERROR(X509V3, do_ext_nconf, X509V3_R_NO_CONFIG_DATABASE); 156 return NULL; 157 } 158 if(!(ext_struc = method->r2i(method, ctx, value))) return NULL; 159 } 160 else 161 { 162 OPENSSL_PUT_ERROR(X509V3, do_ext_nconf, X509V3_R_EXTENSION_SETTING_NOT_SUPPORTED); 163 ERR_add_error_data(2, "name=", OBJ_nid2sn(ext_nid)); 164 return NULL; 165 } 166 167 ext = do_ext_i2d(method, ext_nid, crit, ext_struc); 168 if(method->it) ASN1_item_free(ext_struc, ASN1_ITEM_ptr(method->it)); 169 else method->ext_free(ext_struc); 170 return ext; 171 172 } 173 174static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, int ext_nid, 175 int crit, void *ext_struc) 176 { 177 unsigned char *ext_der; 178 int ext_len; 179 ASN1_OCTET_STRING *ext_oct; 180 X509_EXTENSION *ext; 181 /* Convert internal representation to DER */ 182 if (method->it) 183 { 184 ext_der = NULL; 185 ext_len = ASN1_item_i2d(ext_struc, &ext_der, ASN1_ITEM_ptr(method->it)); 186 if (ext_len < 0) goto merr; 187 } 188 else 189 { 190 unsigned char *p; 191 ext_len = method->i2d(ext_struc, NULL); 192 if(!(ext_der = OPENSSL_malloc(ext_len))) goto merr; 193 p = ext_der; 194 method->i2d(ext_struc, &p); 195 } 196 if (!(ext_oct = M_ASN1_OCTET_STRING_new())) goto merr; 197 ext_oct->data = ext_der; 198 ext_oct->length = ext_len; 199 200 ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct); 201 if (!ext) goto merr; 202 M_ASN1_OCTET_STRING_free(ext_oct); 203 204 return ext; 205 206 merr: 207 OPENSSL_PUT_ERROR(X509V3, do_ext_i2d, ERR_R_MALLOC_FAILURE); 208 return NULL; 209 210 } 211 212/* Given an internal structure, nid and critical flag create an extension */ 213 214X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc) 215 { 216 const X509V3_EXT_METHOD *method; 217 if (!(method = X509V3_EXT_get_nid(ext_nid))) { 218 OPENSSL_PUT_ERROR(X509V3, X509V3_EXT_i2d, X509V3_R_UNKNOWN_EXTENSION); 219 return NULL; 220 } 221 return do_ext_i2d(method, ext_nid, crit, ext_struc); 222} 223 224/* Check the extension string for critical flag */ 225static int v3_check_critical(char **value) 226{ 227 char *p = *value; 228 if ((strlen(p) < 9) || strncmp(p, "critical,", 9)) return 0; 229 p+=9; 230 while(isspace((unsigned char)*p)) p++; 231 *value = p; 232 return 1; 233} 234 235/* Check extension string for generic extension and return the type */ 236static int v3_check_generic(char **value) 237{ 238 int gen_type = 0; 239 char *p = *value; 240 if ((strlen(p) >= 4) && !strncmp(p, "DER:", 4)) 241 { 242 p+=4; 243 gen_type = 1; 244 } 245 else if ((strlen(p) >= 5) && !strncmp(p, "ASN1:", 5)) 246 { 247 p+=5; 248 gen_type = 2; 249 } 250 else 251 return 0; 252 253 while (isspace((unsigned char)*p)) p++; 254 *value = p; 255 return gen_type; 256} 257 258/* Create a generic extension: for now just handle DER type */ 259static X509_EXTENSION *v3_generic_extension(const char *ext, char *value, 260 int crit, int gen_type, 261 X509V3_CTX *ctx) 262 { 263 unsigned char *ext_der=NULL; 264 long ext_len; 265 ASN1_OBJECT *obj=NULL; 266 ASN1_OCTET_STRING *oct=NULL; 267 X509_EXTENSION *extension=NULL; 268 if (!(obj = OBJ_txt2obj(ext, 0))) 269 { 270 OPENSSL_PUT_ERROR(X509V3, v3_generic_extension, X509V3_R_EXTENSION_NAME_ERROR); 271 ERR_add_error_data(2, "name=", ext); 272 goto err; 273 } 274 275 if (gen_type == 1) 276 ext_der = string_to_hex(value, &ext_len); 277 else if (gen_type == 2) 278 ext_der = generic_asn1(value, ctx, &ext_len); 279 280 if (ext_der == NULL) 281 { 282 OPENSSL_PUT_ERROR(X509V3, v3_generic_extension, X509V3_R_EXTENSION_VALUE_ERROR); 283 ERR_add_error_data(2, "value=", value); 284 goto err; 285 } 286 287 if (!(oct = M_ASN1_OCTET_STRING_new())) 288 { 289 OPENSSL_PUT_ERROR(X509V3, v3_generic_extension, ERR_R_MALLOC_FAILURE); 290 goto err; 291 } 292 293 oct->data = ext_der; 294 oct->length = ext_len; 295 ext_der = NULL; 296 297 extension = X509_EXTENSION_create_by_OBJ(NULL, obj, crit, oct); 298 299 err: 300 ASN1_OBJECT_free(obj); 301 M_ASN1_OCTET_STRING_free(oct); 302 if(ext_der) OPENSSL_free(ext_der); 303 return extension; 304 305 } 306 307static unsigned char *generic_asn1(char *value, X509V3_CTX *ctx, long *ext_len) 308 { 309 ASN1_TYPE *typ; 310 unsigned char *ext_der = NULL; 311 typ = ASN1_generate_v3(value, ctx); 312 if (typ == NULL) 313 return NULL; 314 *ext_len = i2d_ASN1_TYPE(typ, &ext_der); 315 ASN1_TYPE_free(typ); 316 return ext_der; 317 } 318 319/* This is the main function: add a bunch of extensions based on a config file 320 * section to an extension STACK. 321 */ 322 323 324int X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, char *section, 325 STACK_OF(X509_EXTENSION) **sk) 326 { 327 X509_EXTENSION *ext; 328 STACK_OF(CONF_VALUE) *nval; 329 CONF_VALUE *val; 330 size_t i; 331 if (!(nval = NCONF_get_section(conf, section))) return 0; 332 for (i = 0; i < sk_CONF_VALUE_num(nval); i++) 333 { 334 val = sk_CONF_VALUE_value(nval, i); 335 if (!(ext = X509V3_EXT_nconf(conf, ctx, val->name, val->value))) 336 return 0; 337 if (sk) X509v3_add_ext(sk, ext, -1); 338 X509_EXTENSION_free(ext); 339 } 340 return 1; 341 } 342 343/* Convenience functions to add extensions to a certificate, CRL and request */ 344 345int X509V3_EXT_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section, 346 X509 *cert) 347 { 348 STACK_OF(X509_EXTENSION) **sk = NULL; 349 if (cert) 350 sk = &cert->cert_info->extensions; 351 return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); 352 } 353 354/* Same as above but for a CRL */ 355 356int X509V3_EXT_CRL_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section, 357 X509_CRL *crl) 358 { 359 STACK_OF(X509_EXTENSION) **sk = NULL; 360 if (crl) 361 sk = &crl->crl->extensions; 362 return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); 363 } 364 365/* Add extensions to certificate request */ 366 367int X509V3_EXT_REQ_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section, 368 X509_REQ *req) 369 { 370 STACK_OF(X509_EXTENSION) *extlist = NULL, **sk = NULL; 371 int i; 372 if (req) 373 sk = &extlist; 374 i = X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); 375 if (!i || !sk) 376 return i; 377 i = X509_REQ_add_extensions(req, extlist); 378 sk_X509_EXTENSION_pop_free(extlist, X509_EXTENSION_free); 379 return i; 380 } 381 382/* Config database functions */ 383 384char * X509V3_get_string(X509V3_CTX *ctx, char *name, char *section) 385 { 386 if(!ctx->db || !ctx->db_meth || !ctx->db_meth->get_string) 387 { 388 OPENSSL_PUT_ERROR(X509V3, X509V3_get_string, X509V3_R_OPERATION_NOT_DEFINED); 389 return NULL; 390 } 391 if (ctx->db_meth->get_string) 392 return ctx->db_meth->get_string(ctx->db, name, section); 393 return NULL; 394 } 395 396STACK_OF(CONF_VALUE) * X509V3_get_section(X509V3_CTX *ctx, char *section) 397 { 398 if(!ctx->db || !ctx->db_meth || !ctx->db_meth->get_section) 399 { 400 OPENSSL_PUT_ERROR(X509V3, X509V3_get_section, X509V3_R_OPERATION_NOT_DEFINED); 401 return NULL; 402 } 403 if (ctx->db_meth->get_section) 404 return ctx->db_meth->get_section(ctx->db, section); 405 return NULL; 406 } 407 408void X509V3_string_free(X509V3_CTX *ctx, char *str) 409 { 410 if (!str) return; 411 if (ctx->db_meth->free_string) 412 ctx->db_meth->free_string(ctx->db, str); 413 } 414 415void X509V3_section_free(X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *section) 416 { 417 if (!section) return; 418 if (ctx->db_meth->free_section) 419 ctx->db_meth->free_section(ctx->db, section); 420 } 421 422static char *nconf_get_string(void *db, char *section, char *value) 423 { 424 /* TODO(fork): this should return a const value. */ 425 return (char *) NCONF_get_string(db, section, value); 426 } 427 428static STACK_OF(CONF_VALUE) *nconf_get_section(void *db, char *section) 429 { 430 return NCONF_get_section(db, section); 431 } 432 433static X509V3_CONF_METHOD nconf_method = { 434nconf_get_string, 435nconf_get_section, 436NULL, 437NULL 438}; 439 440void X509V3_set_nconf(X509V3_CTX *ctx, CONF *conf) 441 { 442 ctx->db_meth = &nconf_method; 443 ctx->db = conf; 444 } 445 446void X509V3_set_ctx(X509V3_CTX *ctx, X509 *issuer, X509 *subj, X509_REQ *req, 447 X509_CRL *crl, int flags) 448 { 449 ctx->issuer_cert = issuer; 450 ctx->subject_cert = subj; 451 ctx->crl = crl; 452 ctx->subject_req = req; 453 ctx->flags = flags; 454 } 455 456/* TODO(fork): remove */ 457#if 0 458/* Old conf compatibility functions */ 459 460X509_EXTENSION *X509V3_EXT_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx, 461 char *name, char *value) 462 { 463 CONF ctmp; 464 CONF_set_nconf(&ctmp, conf); 465 return X509V3_EXT_nconf(&ctmp, ctx, name, value); 466 } 467 468/* LHASH *conf: Config file */ 469/* char *value: Value */ 470X509_EXTENSION *X509V3_EXT_conf_nid(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx, 471 int ext_nid, char *value) 472 { 473 CONF ctmp; 474 CONF_set_nconf(&ctmp, conf); 475 return X509V3_EXT_nconf_nid(&ctmp, ctx, ext_nid, value); 476 } 477 478static char *conf_lhash_get_string(void *db, char *section, char *value) 479 { 480 return CONF_get_string(db, section, value); 481 } 482 483static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, char *section) 484 { 485 return CONF_get_section(db, section); 486 } 487 488static X509V3_CONF_METHOD conf_lhash_method = { 489conf_lhash_get_string, 490conf_lhash_get_section, 491NULL, 492NULL 493}; 494 495void X509V3_set_conf_lhash(X509V3_CTX *ctx, LHASH_OF(CONF_VALUE) *lhash) 496 { 497 ctx->db_meth = &conf_lhash_method; 498 ctx->db = lhash; 499 } 500 501int X509V3_EXT_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx, 502 char *section, X509 *cert) 503 { 504 CONF ctmp; 505 CONF_set_nconf(&ctmp, conf); 506 return X509V3_EXT_add_nconf(&ctmp, ctx, section, cert); 507 } 508 509/* Same as above but for a CRL */ 510 511int X509V3_EXT_CRL_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx, 512 char *section, X509_CRL *crl) 513 { 514 CONF ctmp; 515 CONF_set_nconf(&ctmp, conf); 516 return X509V3_EXT_CRL_add_nconf(&ctmp, ctx, section, crl); 517 } 518 519/* Add extensions to certificate request */ 520 521int X509V3_EXT_REQ_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx, 522 char *section, X509_REQ *req) 523 { 524 CONF ctmp; 525 CONF_set_nconf(&ctmp, conf); 526 return X509V3_EXT_REQ_add_nconf(&ctmp, ctx, section, req); 527 } 528#endif 529