1 /* $OpenBSD: x509_conf.c,v 1.1 2020/06/04 15:19:31 jsing Exp $ */ 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 */ 58 /* extension creation utilities */ 59 60 #include <ctype.h> 61 #include <stdio.h> 62 #include <string.h> 63 64 #include <openssl/conf.h> 65 #include <openssl/err.h> 66 #include <openssl/x509.h> 67 #include <openssl/x509v3.h> 68 69 static int v3_check_critical(const char **value); 70 static int v3_check_generic(const char **value); 71 static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid, 72 int crit, const char *value); 73 static X509_EXTENSION *v3_generic_extension(const char *ext, const char *value, 74 int crit, int type, X509V3_CTX *ctx); 75 static char *conf_lhash_get_string(void *db, const char *section, 76 const char *value); 77 static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, 78 const char *section); 79 static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, int ext_nid, 80 int crit, void *ext_struc); 81 static unsigned char *generic_asn1(const char *value, X509V3_CTX *ctx, 82 long *ext_len); 83 84 /* CONF *conf: Config file */ 85 /* char *name: Name */ 86 /* char *value: Value */ 87 X509_EXTENSION * 88 X509V3_EXT_nconf(CONF *conf, X509V3_CTX *ctx, const char *name, 89 const char *value) 90 { 91 int crit; 92 int ext_type; 93 X509_EXTENSION *ret; 94 95 crit = v3_check_critical(&value); 96 if ((ext_type = v3_check_generic(&value))) 97 return v3_generic_extension(name, value, crit, ext_type, ctx); 98 ret = do_ext_nconf(conf, ctx, OBJ_sn2nid(name), crit, value); 99 if (!ret) { 100 X509V3error(X509V3_R_ERROR_IN_EXTENSION); 101 ERR_asprintf_error_data("name=%s, value=%s", name, value); 102 } 103 return ret; 104 } 105 106 /* CONF *conf: Config file */ 107 /* char *value: Value */ 108 X509_EXTENSION * 109 X509V3_EXT_nconf_nid(CONF *conf, X509V3_CTX *ctx, int ext_nid, 110 const char *value) 111 { 112 int crit; 113 int ext_type; 114 115 crit = v3_check_critical(&value); 116 if ((ext_type = v3_check_generic(&value))) 117 return v3_generic_extension(OBJ_nid2sn(ext_nid), 118 value, crit, ext_type, ctx); 119 return do_ext_nconf(conf, ctx, ext_nid, crit, value); 120 } 121 122 /* CONF *conf: Config file */ 123 /* char *value: Value */ 124 static X509_EXTENSION * 125 do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid, int crit, 126 const char *value) 127 { 128 const X509V3_EXT_METHOD *method; 129 X509_EXTENSION *ext; 130 void *ext_struc; 131 132 if (ext_nid == NID_undef) { 133 X509V3error(X509V3_R_UNKNOWN_EXTENSION_NAME); 134 return NULL; 135 } 136 if (!(method = X509V3_EXT_get_nid(ext_nid))) { 137 X509V3error(X509V3_R_UNKNOWN_EXTENSION); 138 return NULL; 139 } 140 /* Now get internal extension representation based on type */ 141 if (method->v2i) { 142 STACK_OF(CONF_VALUE) *nval; 143 144 if (*value == '@') 145 nval = NCONF_get_section(conf, value + 1); 146 else 147 nval = X509V3_parse_list(value); 148 if (sk_CONF_VALUE_num(nval) <= 0) { 149 X509V3error(X509V3_R_INVALID_EXTENSION_STRING); 150 ERR_asprintf_error_data("name=%s,section=%s", 151 OBJ_nid2sn(ext_nid), value); 152 if (*value != '@') 153 sk_CONF_VALUE_pop_free(nval, X509V3_conf_free); 154 return NULL; 155 } 156 ext_struc = method->v2i(method, ctx, nval); 157 if (*value != '@') 158 sk_CONF_VALUE_pop_free(nval, X509V3_conf_free); 159 } else if (method->s2i) { 160 ext_struc = method->s2i(method, ctx, value); 161 } else if (method->r2i) { 162 if (!ctx->db || !ctx->db_meth) { 163 X509V3error(X509V3_R_NO_CONFIG_DATABASE); 164 return NULL; 165 } 166 ext_struc = method->r2i(method, ctx, value); 167 } else { 168 X509V3error(X509V3_R_EXTENSION_SETTING_NOT_SUPPORTED); 169 ERR_asprintf_error_data("name=%s", OBJ_nid2sn(ext_nid)); 170 return NULL; 171 } 172 if (ext_struc == NULL) 173 return NULL; 174 175 ext = do_ext_i2d(method, ext_nid, crit, ext_struc); 176 if (method->it) 177 ASN1_item_free(ext_struc, method->it); 178 else 179 method->ext_free(ext_struc); 180 return ext; 181 } 182 183 static X509_EXTENSION * 184 do_ext_i2d(const X509V3_EXT_METHOD *method, int ext_nid, int crit, 185 void *ext_struc) 186 { 187 unsigned char *ext_der; 188 int ext_len; 189 ASN1_OCTET_STRING *ext_oct = NULL; 190 X509_EXTENSION *ext; 191 192 /* Convert internal representation to DER */ 193 if (method->it) { 194 ext_der = NULL; 195 ext_len = ASN1_item_i2d(ext_struc, &ext_der, 196 method->it); 197 if (ext_len < 0) 198 goto merr; 199 } else { 200 unsigned char *p; 201 ext_len = method->i2d(ext_struc, NULL); 202 if (!(ext_der = malloc(ext_len))) 203 goto merr; 204 p = ext_der; 205 method->i2d(ext_struc, &p); 206 } 207 if (!(ext_oct = ASN1_OCTET_STRING_new())) 208 goto merr; 209 ext_oct->data = ext_der; 210 ext_oct->length = ext_len; 211 212 ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct); 213 if (!ext) 214 goto merr; 215 ASN1_OCTET_STRING_free(ext_oct); 216 217 return ext; 218 219 merr: 220 ASN1_OCTET_STRING_free(ext_oct); 221 X509V3error(ERR_R_MALLOC_FAILURE); 222 return NULL; 223 224 } 225 226 /* Given an internal structure, nid and critical flag create an extension */ 227 228 X509_EXTENSION * 229 X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc) 230 { 231 const X509V3_EXT_METHOD *method; 232 233 if (!(method = X509V3_EXT_get_nid(ext_nid))) { 234 X509V3error(X509V3_R_UNKNOWN_EXTENSION); 235 return NULL; 236 } 237 return do_ext_i2d(method, ext_nid, crit, ext_struc); 238 } 239 240 /* Check the extension string for critical flag */ 241 static int 242 v3_check_critical(const char **value) 243 { 244 const char *p = *value; 245 246 if ((strlen(p) < 9) || strncmp(p, "critical,", 9)) 247 return 0; 248 p += 9; 249 while (isspace((unsigned char)*p)) p++; 250 *value = p; 251 return 1; 252 } 253 254 /* Check extension string for generic extension and return the type */ 255 static int 256 v3_check_generic(const char **value) 257 { 258 int gen_type = 0; 259 const char *p = *value; 260 261 if ((strlen(p) >= 4) && !strncmp(p, "DER:", 4)) { 262 p += 4; 263 gen_type = 1; 264 } else if ((strlen(p) >= 5) && !strncmp(p, "ASN1:", 5)) { 265 p += 5; 266 gen_type = 2; 267 } else 268 return 0; 269 270 while (isspace((unsigned char)*p)) 271 p++; 272 *value = p; 273 return gen_type; 274 } 275 276 /* Create a generic extension: for now just handle DER type */ 277 static X509_EXTENSION * 278 v3_generic_extension(const char *ext, const char *value, int crit, int gen_type, 279 X509V3_CTX *ctx) 280 { 281 unsigned char *ext_der = NULL; 282 long ext_len = 0; 283 ASN1_OBJECT *obj = NULL; 284 ASN1_OCTET_STRING *oct = NULL; 285 X509_EXTENSION *extension = NULL; 286 287 if (!(obj = OBJ_txt2obj(ext, 0))) { 288 X509V3error(X509V3_R_EXTENSION_NAME_ERROR); 289 ERR_asprintf_error_data("name=%s", ext); 290 goto err; 291 } 292 293 if (gen_type == 1) 294 ext_der = string_to_hex(value, &ext_len); 295 else if (gen_type == 2) 296 ext_der = generic_asn1(value, ctx, &ext_len); 297 else { 298 ERR_asprintf_error_data("Unexpected generic extension type %d", gen_type); 299 goto err; 300 } 301 302 if (ext_der == NULL) { 303 X509V3error(X509V3_R_EXTENSION_VALUE_ERROR); 304 ERR_asprintf_error_data("value=%s", value); 305 goto err; 306 } 307 308 if (!(oct = ASN1_OCTET_STRING_new())) { 309 X509V3error(ERR_R_MALLOC_FAILURE); 310 goto err; 311 } 312 313 oct->data = ext_der; 314 oct->length = ext_len; 315 ext_der = NULL; 316 317 extension = X509_EXTENSION_create_by_OBJ(NULL, obj, crit, oct); 318 319 err: 320 ASN1_OBJECT_free(obj); 321 ASN1_OCTET_STRING_free(oct); 322 free(ext_der); 323 return extension; 324 } 325 326 static unsigned char * 327 generic_asn1(const char *value, X509V3_CTX *ctx, long *ext_len) 328 { 329 ASN1_TYPE *typ; 330 unsigned char *ext_der = NULL; 331 332 typ = ASN1_generate_v3(value, ctx); 333 if (typ == NULL) 334 return NULL; 335 *ext_len = i2d_ASN1_TYPE(typ, &ext_der); 336 ASN1_TYPE_free(typ); 337 return ext_der; 338 } 339 340 /* This is the main function: add a bunch of extensions based on a config file 341 * section to an extension STACK. 342 */ 343 344 int 345 X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, const char *section, 346 STACK_OF(X509_EXTENSION) **sk) 347 { 348 X509_EXTENSION *ext; 349 STACK_OF(CONF_VALUE) *nval; 350 CONF_VALUE *val; 351 int i; 352 353 if (!(nval = NCONF_get_section(conf, section))) 354 return 0; 355 for (i = 0; i < sk_CONF_VALUE_num(nval); i++) { 356 val = sk_CONF_VALUE_value(nval, i); 357 if (!(ext = X509V3_EXT_nconf(conf, ctx, val->name, val->value))) 358 return 0; 359 if (sk) 360 X509v3_add_ext(sk, ext, -1); 361 X509_EXTENSION_free(ext); 362 } 363 return 1; 364 } 365 366 /* Convenience functions to add extensions to a certificate, CRL and request */ 367 368 int 369 X509V3_EXT_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section, 370 X509 *cert) 371 { 372 STACK_OF(X509_EXTENSION) **sk = NULL; 373 374 if (cert) 375 sk = &cert->cert_info->extensions; 376 return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); 377 } 378 379 /* Same as above but for a CRL */ 380 381 int 382 X509V3_EXT_CRL_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section, 383 X509_CRL *crl) 384 { 385 STACK_OF(X509_EXTENSION) **sk = NULL; 386 387 if (crl) 388 sk = &crl->crl->extensions; 389 return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); 390 } 391 392 /* Add extensions to certificate request */ 393 394 int 395 X509V3_EXT_REQ_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section, 396 X509_REQ *req) 397 { 398 STACK_OF(X509_EXTENSION) *extlist = NULL, **sk = NULL; 399 int i; 400 401 if (req) 402 sk = &extlist; 403 i = X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); 404 if (!i || !sk) 405 return i; 406 i = X509_REQ_add_extensions(req, extlist); 407 sk_X509_EXTENSION_pop_free(extlist, X509_EXTENSION_free); 408 return i; 409 } 410 411 /* Config database functions */ 412 413 char * 414 X509V3_get_string(X509V3_CTX *ctx, const char *name, const char *section) 415 { 416 if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_string) { 417 X509V3error(X509V3_R_OPERATION_NOT_DEFINED); 418 return NULL; 419 } 420 return ctx->db_meth->get_string(ctx->db, name, section); 421 } 422 423 STACK_OF(CONF_VALUE) * 424 X509V3_get_section(X509V3_CTX *ctx, const char *section) 425 { 426 if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_section) { 427 X509V3error(X509V3_R_OPERATION_NOT_DEFINED); 428 return NULL; 429 } 430 return ctx->db_meth->get_section(ctx->db, section); 431 } 432 433 void 434 X509V3_string_free(X509V3_CTX *ctx, char *str) 435 { 436 if (!str) 437 return; 438 if (ctx->db_meth->free_string) 439 ctx->db_meth->free_string(ctx->db, str); 440 } 441 442 void 443 X509V3_section_free(X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *section) 444 { 445 if (!section) 446 return; 447 if (ctx->db_meth->free_section) 448 ctx->db_meth->free_section(ctx->db, section); 449 } 450 451 static char * 452 nconf_get_string(void *db, const char *section, const char *value) 453 { 454 return NCONF_get_string(db, section, value); 455 } 456 457 static STACK_OF(CONF_VALUE) * 458 nconf_get_section(void *db, const char *section) 459 { 460 return NCONF_get_section(db, section); 461 } 462 463 static X509V3_CONF_METHOD nconf_method = { 464 nconf_get_string, 465 nconf_get_section, 466 NULL, 467 NULL 468 }; 469 470 void 471 X509V3_set_nconf(X509V3_CTX *ctx, CONF *conf) 472 { 473 ctx->db_meth = &nconf_method; 474 ctx->db = conf; 475 } 476 477 void 478 X509V3_set_ctx(X509V3_CTX *ctx, X509 *issuer, X509 *subj, X509_REQ *req, 479 X509_CRL *crl, int flags) 480 { 481 ctx->issuer_cert = issuer; 482 ctx->subject_cert = subj; 483 ctx->crl = crl; 484 ctx->subject_req = req; 485 ctx->flags = flags; 486 } 487 488 /* Old conf compatibility functions */ 489 490 X509_EXTENSION * 491 X509V3_EXT_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx, const char *name, 492 const char *value) 493 { 494 CONF ctmp; 495 496 CONF_set_nconf(&ctmp, conf); 497 return X509V3_EXT_nconf(&ctmp, ctx, name, value); 498 } 499 500 /* LHASH *conf: Config file */ 501 /* char *value: Value */ 502 X509_EXTENSION * 503 X509V3_EXT_conf_nid(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx, int ext_nid, 504 const char *value) 505 { 506 CONF ctmp; 507 508 CONF_set_nconf(&ctmp, conf); 509 return X509V3_EXT_nconf_nid(&ctmp, ctx, ext_nid, value); 510 } 511 512 static char * 513 conf_lhash_get_string(void *db, const char *section, const char *value) 514 { 515 return CONF_get_string(db, section, value); 516 } 517 518 static STACK_OF(CONF_VALUE) * 519 conf_lhash_get_section(void *db, const char *section) 520 { 521 return CONF_get_section(db, section); 522 } 523 524 static X509V3_CONF_METHOD conf_lhash_method = { 525 conf_lhash_get_string, 526 conf_lhash_get_section, 527 NULL, 528 NULL 529 }; 530 531 void 532 X509V3_set_conf_lhash(X509V3_CTX *ctx, LHASH_OF(CONF_VALUE) *lhash) 533 { 534 ctx->db_meth = &conf_lhash_method; 535 ctx->db = lhash; 536 } 537 538 int 539 X509V3_EXT_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx, 540 const char *section, X509 *cert) 541 { 542 CONF ctmp; 543 544 CONF_set_nconf(&ctmp, conf); 545 return X509V3_EXT_add_nconf(&ctmp, ctx, section, cert); 546 } 547 548 /* Same as above but for a CRL */ 549 550 int 551 X509V3_EXT_CRL_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx, 552 const char *section, X509_CRL *crl) 553 { 554 CONF ctmp; 555 556 CONF_set_nconf(&ctmp, conf); 557 return X509V3_EXT_CRL_add_nconf(&ctmp, ctx, section, crl); 558 } 559 560 /* Add extensions to certificate request */ 561 562 int 563 X509V3_EXT_REQ_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx, 564 const char *section, X509_REQ *req) 565 { 566 CONF ctmp; 567 568 CONF_set_nconf(&ctmp, conf); 569 return X509V3_EXT_REQ_add_nconf(&ctmp, ctx, section, req); 570 } 571