1 /* v3_conf.c */ 2 /* 3 * Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL project 4 * 1999. 5 */ 6 /* ==================================================================== 7 * Copyright (c) 1999-2002 The OpenSSL Project. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. All advertising materials mentioning features or use of this 22 * software must display the following acknowledgment: 23 * "This product includes software developed by the OpenSSL Project 24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25 * 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27 * endorse or promote products derived from this software without 28 * prior written permission. For written permission, please contact 29 * licensing (at) OpenSSL.org. 30 * 31 * 5. Products derived from this software may not be called "OpenSSL" 32 * nor may "OpenSSL" appear in their names without prior written 33 * permission of the OpenSSL Project. 34 * 35 * 6. Redistributions of any form whatsoever must retain the following 36 * acknowledgment: 37 * "This product includes software developed by the OpenSSL Project 38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51 * OF THE POSSIBILITY OF SUCH DAMAGE. 52 * ==================================================================== 53 * 54 * This product includes cryptographic software written by Eric Young 55 * (eay (at) cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh (at) cryptsoft.com). */ 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/mem.h> 67 #include <openssl/obj.h> 68 #include <openssl/x509.h> 69 #include <openssl/x509v3.h> 70 71 #include "../internal.h" 72 #include "internal.h" 73 74 static int v3_check_critical(char **value); 75 static int v3_check_generic(char **value); 76 static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid, 77 int crit, char *value); 78 static X509_EXTENSION *v3_generic_extension(const char *ext, char *value, 79 int crit, int type, 80 X509V3_CTX *ctx); 81 static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, 82 int ext_nid, int crit, void *ext_struc); 83 static unsigned char *generic_asn1(char *value, X509V3_CTX *ctx, 84 long *ext_len); 85 /* CONF *conf: Config file */ 86 /* char *name: Name */ 87 /* char *value: Value */ 88 X509_EXTENSION *X509V3_EXT_nconf(CONF *conf, X509V3_CTX *ctx, char *name, 89 char *value) 90 { 91 int crit; 92 int ext_type; 93 X509_EXTENSION *ret; 94 crit = v3_check_critical(&value); 95 if ((ext_type = v3_check_generic(&value))) 96 return v3_generic_extension(name, value, crit, ext_type, ctx); 97 ret = do_ext_nconf(conf, ctx, OBJ_sn2nid(name), crit, value); 98 if (!ret) { 99 OPENSSL_PUT_ERROR(X509V3, X509V3_R_ERROR_IN_EXTENSION); 100 ERR_add_error_data(4, "name=", name, ", value=", value); 101 } 102 return ret; 103 } 104 105 /* CONF *conf: Config file */ 106 /* char *value: Value */ 107 X509_EXTENSION *X509V3_EXT_nconf_nid(CONF *conf, X509V3_CTX *ctx, int ext_nid, 108 char *value) 109 { 110 int crit; 111 int ext_type; 112 crit = v3_check_critical(&value); 113 if ((ext_type = v3_check_generic(&value))) 114 return v3_generic_extension(OBJ_nid2sn(ext_nid), 115 value, crit, ext_type, ctx); 116 return do_ext_nconf(conf, ctx, ext_nid, crit, value); 117 } 118 119 /* CONF *conf: Config file */ 120 /* char *value: Value */ 121 static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid, 122 int crit, char *value) 123 { 124 const X509V3_EXT_METHOD *method; 125 X509_EXTENSION *ext; 126 STACK_OF(CONF_VALUE) *nval; 127 void *ext_struc; 128 if (ext_nid == NID_undef) { 129 OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNKNOWN_EXTENSION_NAME); 130 return NULL; 131 } 132 if (!(method = X509V3_EXT_get_nid(ext_nid))) { 133 OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNKNOWN_EXTENSION); 134 return NULL; 135 } 136 /* Now get internal extension representation based on type */ 137 if (method->v2i) { 138 if (*value == '@') 139 nval = NCONF_get_section(conf, value + 1); 140 else 141 nval = X509V3_parse_list(value); 142 if (nval == NULL || sk_CONF_VALUE_num(nval) <= 0) { 143 OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_EXTENSION_STRING); 144 ERR_add_error_data(4, "name=", OBJ_nid2sn(ext_nid), ",section=", 145 value); 146 if (*value != '@') 147 sk_CONF_VALUE_pop_free(nval, X509V3_conf_free); 148 return NULL; 149 } 150 ext_struc = method->v2i(method, ctx, nval); 151 if (*value != '@') 152 sk_CONF_VALUE_pop_free(nval, X509V3_conf_free); 153 if (!ext_struc) 154 return NULL; 155 } else if (method->s2i) { 156 if (!(ext_struc = method->s2i(method, ctx, value))) 157 return NULL; 158 } else if (method->r2i) { 159 if (!ctx->db || !ctx->db_meth) { 160 OPENSSL_PUT_ERROR(X509V3, X509V3_R_NO_CONFIG_DATABASE); 161 return NULL; 162 } 163 if (!(ext_struc = method->r2i(method, ctx, value))) 164 return NULL; 165 } else { 166 OPENSSL_PUT_ERROR(X509V3, X509V3_R_EXTENSION_SETTING_NOT_SUPPORTED); 167 ERR_add_error_data(2, "name=", OBJ_nid2sn(ext_nid)); 168 return NULL; 169 } 170 171 ext = do_ext_i2d(method, ext_nid, crit, ext_struc); 172 if (method->it) 173 ASN1_item_free(ext_struc, ASN1_ITEM_ptr(method->it)); 174 else 175 method->ext_free(ext_struc); 176 return ext; 177 178 } 179 180 static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, 181 int ext_nid, int crit, void *ext_struc) 182 { 183 unsigned char *ext_der; 184 int ext_len; 185 ASN1_OCTET_STRING *ext_oct; 186 X509_EXTENSION *ext; 187 /* Convert internal representation to DER */ 188 if (method->it) { 189 ext_der = NULL; 190 ext_len = 191 ASN1_item_i2d(ext_struc, &ext_der, ASN1_ITEM_ptr(method->it)); 192 if (ext_len < 0) 193 goto merr; 194 } else { 195 unsigned char *p; 196 ext_len = method->i2d(ext_struc, NULL); 197 if (!(ext_der = OPENSSL_malloc(ext_len))) 198 goto merr; 199 p = ext_der; 200 method->i2d(ext_struc, &p); 201 } 202 if (!(ext_oct = M_ASN1_OCTET_STRING_new())) 203 goto merr; 204 ext_oct->data = ext_der; 205 ext_oct->length = ext_len; 206 207 ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct); 208 if (!ext) 209 goto merr; 210 M_ASN1_OCTET_STRING_free(ext_oct); 211 212 return ext; 213 214 merr: 215 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE); 216 return NULL; 217 218 } 219 220 /* Given an internal structure, nid and critical flag create an extension */ 221 222 X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc) 223 { 224 const X509V3_EXT_METHOD *method; 225 if (!(method = X509V3_EXT_get_nid(ext_nid))) { 226 OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNKNOWN_EXTENSION); 227 return NULL; 228 } 229 return do_ext_i2d(method, ext_nid, crit, ext_struc); 230 } 231 232 /* Check the extension string for critical flag */ 233 static int v3_check_critical(char **value) 234 { 235 char *p = *value; 236 if ((strlen(p) < 9) || strncmp(p, "critical,", 9)) 237 return 0; 238 p += 9; 239 while (isspace((unsigned char)*p)) 240 p++; 241 *value = p; 242 return 1; 243 } 244 245 /* Check extension string for generic extension and return the type */ 246 static int v3_check_generic(char **value) 247 { 248 int gen_type = 0; 249 char *p = *value; 250 if ((strlen(p) >= 4) && !strncmp(p, "DER:", 4)) { 251 p += 4; 252 gen_type = 1; 253 } else if ((strlen(p) >= 5) && !strncmp(p, "ASN1:", 5)) { 254 p += 5; 255 gen_type = 2; 256 } else 257 return 0; 258 259 while (isspace((unsigned char)*p)) 260 p++; 261 *value = p; 262 return gen_type; 263 } 264 265 /* Create a generic extension: for now just handle DER type */ 266 static X509_EXTENSION *v3_generic_extension(const char *ext, char *value, 267 int crit, int gen_type, 268 X509V3_CTX *ctx) 269 { 270 unsigned char *ext_der = NULL; 271 long ext_len = 0; 272 ASN1_OBJECT *obj = NULL; 273 ASN1_OCTET_STRING *oct = NULL; 274 X509_EXTENSION *extension = NULL; 275 if (!(obj = OBJ_txt2obj(ext, 0))) { 276 OPENSSL_PUT_ERROR(X509V3, X509V3_R_EXTENSION_NAME_ERROR); 277 ERR_add_error_data(2, "name=", ext); 278 goto err; 279 } 280 281 if (gen_type == 1) 282 ext_der = x509v3_hex_to_bytes(value, &ext_len); 283 else if (gen_type == 2) 284 ext_der = generic_asn1(value, ctx, &ext_len); 285 286 if (ext_der == NULL) { 287 OPENSSL_PUT_ERROR(X509V3, X509V3_R_EXTENSION_VALUE_ERROR); 288 ERR_add_error_data(2, "value=", value); 289 goto err; 290 } 291 292 if (!(oct = M_ASN1_OCTET_STRING_new())) { 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) 307 OPENSSL_free(ext_der); 308 return extension; 309 310 } 311 312 static unsigned char *generic_asn1(char *value, X509V3_CTX *ctx, 313 long *ext_len) 314 { 315 ASN1_TYPE *typ; 316 unsigned char *ext_der = NULL; 317 typ = ASN1_generate_v3(value, ctx); 318 if (typ == NULL) 319 return NULL; 320 *ext_len = i2d_ASN1_TYPE(typ, &ext_der); 321 ASN1_TYPE_free(typ); 322 return ext_der; 323 } 324 325 /* 326 * This is the main function: add a bunch of extensions based on a config 327 * file section to an extension STACK. 328 */ 329 330 int X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, char *section, 331 STACK_OF(X509_EXTENSION) **sk) 332 { 333 X509_EXTENSION *ext; 334 STACK_OF(CONF_VALUE) *nval; 335 CONF_VALUE *val; 336 size_t i; 337 if (!(nval = NCONF_get_section(conf, section))) 338 return 0; 339 for (i = 0; i < sk_CONF_VALUE_num(nval); i++) { 340 val = sk_CONF_VALUE_value(nval, i); 341 if (!(ext = X509V3_EXT_nconf(conf, ctx, val->name, val->value))) 342 return 0; 343 if (sk) 344 X509v3_add_ext(sk, ext, -1); 345 X509_EXTENSION_free(ext); 346 } 347 return 1; 348 } 349 350 /* 351 * Convenience functions to add extensions to a certificate, CRL and request 352 */ 353 354 int X509V3_EXT_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section, 355 X509 *cert) 356 { 357 STACK_OF(X509_EXTENSION) **sk = NULL; 358 if (cert) 359 sk = &cert->cert_info->extensions; 360 return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); 361 } 362 363 /* Same as above but for a CRL */ 364 365 int X509V3_EXT_CRL_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section, 366 X509_CRL *crl) 367 { 368 STACK_OF(X509_EXTENSION) **sk = NULL; 369 if (crl) 370 sk = &crl->crl->extensions; 371 return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); 372 } 373 374 /* Add extensions to certificate request */ 375 376 int X509V3_EXT_REQ_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section, 377 X509_REQ *req) 378 { 379 STACK_OF(X509_EXTENSION) *extlist = NULL, **sk = NULL; 380 int i; 381 if (req) 382 sk = &extlist; 383 i = X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); 384 if (!i || !sk) 385 return i; 386 i = X509_REQ_add_extensions(req, extlist); 387 sk_X509_EXTENSION_pop_free(extlist, X509_EXTENSION_free); 388 return i; 389 } 390 391 /* Config database functions */ 392 393 char *X509V3_get_string(X509V3_CTX *ctx, char *name, char *section) 394 { 395 if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_string) { 396 OPENSSL_PUT_ERROR(X509V3, X509V3_R_OPERATION_NOT_DEFINED); 397 return NULL; 398 } 399 if (ctx->db_meth->get_string) 400 return ctx->db_meth->get_string(ctx->db, name, section); 401 return NULL; 402 } 403 404 STACK_OF(CONF_VALUE) *X509V3_get_section(X509V3_CTX *ctx, char *section) 405 { 406 if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_section) { 407 OPENSSL_PUT_ERROR(X509V3, X509V3_R_OPERATION_NOT_DEFINED); 408 return NULL; 409 } 410 if (ctx->db_meth->get_section) 411 return ctx->db_meth->get_section(ctx->db, section); 412 return NULL; 413 } 414 415 void X509V3_string_free(X509V3_CTX *ctx, char *str) 416 { 417 if (!str) 418 return; 419 if (ctx->db_meth->free_string) 420 ctx->db_meth->free_string(ctx->db, str); 421 } 422 423 void X509V3_section_free(X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *section) 424 { 425 if (!section) 426 return; 427 if (ctx->db_meth->free_section) 428 ctx->db_meth->free_section(ctx->db, section); 429 } 430 431 static char *nconf_get_string(void *db, char *section, char *value) 432 { 433 /* TODO(fork): this should return a const value. */ 434 return (char *)NCONF_get_string(db, section, value); 435 } 436 437 static STACK_OF(CONF_VALUE) *nconf_get_section(void *db, char *section) 438 { 439 return NCONF_get_section(db, section); 440 } 441 442 static const X509V3_CONF_METHOD nconf_method = { 443 nconf_get_string, 444 nconf_get_section, 445 NULL, 446 NULL 447 }; 448 449 void X509V3_set_nconf(X509V3_CTX *ctx, CONF *conf) 450 { 451 ctx->db_meth = &nconf_method; 452 ctx->db = conf; 453 } 454 455 void X509V3_set_ctx(X509V3_CTX *ctx, X509 *issuer, X509 *subj, X509_REQ *req, 456 X509_CRL *crl, int flags) 457 { 458 ctx->issuer_cert = issuer; 459 ctx->subject_cert = subj; 460 ctx->crl = crl; 461 ctx->subject_req = req; 462 ctx->flags = flags; 463 } 464
