crypto/x509v3/v3_conf.c

   1 /* v3_conf.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@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@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@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* extension creation utilities */
  60
  61 #include <stdio.h>
  62 #include <ctype.h>
  63 #include "cryptlib.h"
  64 #include <openssl/conf.h>
  65 #include <openssl/x509.h>
  66 #include <openssl/x509v3.h>
  67
  68 static int v3_check_critical(char **value);
  69 static int v3_check_generic(char **value);
  70 static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid,
  71                                     int crit, char *value);
  72 static X509_EXTENSION *v3_generic_extension(const char *ext, char *value,
  73                                             int crit, int type,
  74                                             X509V3_CTX *ctx);
  75 static char *conf_lhash_get_string(void *db, char *section, char *value);
  76 static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, char *section);
  77 static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method,
  78                                   int ext_nid, int crit, void *ext_struc);
  79 static unsigned char *generic_asn1(char *value, X509V3_CTX *ctx,
  80                                    long *ext_len);
  81 /* CONF *conf:  Config file    */
  82 /* char *name:  Name    */
  83 /* char *value:  Value    */
  84 X509_EXTENSION *X509V3_EXT_nconf(CONF *conf, X509V3_CTX *ctx, char *name,
  85                                  char *value)
  86 {
  87     int crit;
  88     int ext_type;
  89     X509_EXTENSION *ret;
  90     crit = v3_check_critical(&value);
  91     if ((ext_type = v3_check_generic(&value)))
  92         return v3_generic_extension(name, value, crit, ext_type, ctx);
  93     ret = do_ext_nconf(conf, ctx, OBJ_sn2nid(name), crit, value);
  94     if (!ret) {
  95         X509V3err(X509V3_F_X509V3_EXT_NCONF, 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         X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_UNKNOWN_EXTENSION_NAME);
 126         return NULL;
 127     }
 128     if (!(method = X509V3_EXT_get_nid(ext_nid))) {
 129         X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_UNKNOWN_EXTENSION);
 130         return NULL;
 131     }
 132     /* Now get internal extension representation based on type */
 133     if (method->v2i) {
 134         if (*value == '@')
 135             nval = NCONF_get_section(conf, value + 1);
 136         else
 137             nval = X509V3_parse_list(value);
 138         if (sk_CONF_VALUE_num(nval) <= 0) {
 139             X509V3err(X509V3_F_DO_EXT_NCONF,
 140                       X509V3_R_INVALID_EXTENSION_STRING);
 141             ERR_add_error_data(4, "name=", OBJ_nid2sn(ext_nid), ",section=",
 142                                value);
 143             return NULL;
 144         }
 145         ext_struc = method->v2i(method, ctx, nval);
 146         if (*value != '@')
 147             sk_CONF_VALUE_pop_free(nval, X509V3_conf_free);
 148         if (!ext_struc)
 149             return NULL;
 150     } else if (method->s2i) {
 151         if (!(ext_struc = method->s2i(method, ctx, value)))
 152             return NULL;
 153     } else if (method->r2i) {
 154         if (!ctx->db || !ctx->db_meth) {
 155             X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_NO_CONFIG_DATABASE);
 156             return NULL;
 157         }
 158         if (!(ext_struc = method->r2i(method, ctx, value)))
 159             return NULL;
 160     } else {
 161         X509V3err(X509V3_F_DO_EXT_NCONF,
 162                   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)
 169         ASN1_item_free(ext_struc, ASN1_ITEM_ptr(method->it));
 170     else
 171         method->ext_free(ext_struc);
 172     return ext;
 173
 174 }
 175
 176 static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method,
 177                                   int ext_nid, int crit, void *ext_struc)
 178 {
 179     unsigned char *ext_der = NULL;
 180     int ext_len;
 181     ASN1_OCTET_STRING *ext_oct = NULL;
 182     X509_EXTENSION *ext;
 183     /* Convert internal representation to DER */
 184     if (method->it) {
 185         ext_der = NULL;
 186         ext_len =
 187             ASN1_item_i2d(ext_struc, &ext_der, ASN1_ITEM_ptr(method->it));
 188         if (ext_len < 0)
 189             goto merr;
 190     } else {
 191         unsigned char *p;
 192         ext_len = method->i2d(ext_struc, NULL);
 193         if (!(ext_der = OPENSSL_malloc(ext_len)))
 194             goto merr;
 195         p = ext_der;
 196         method->i2d(ext_struc, &p);
 197     }
 198     if (!(ext_oct = ASN1_OCTET_STRING_new()))
 199         goto merr;
 200     ext_oct->data = ext_der;
 201     ext_der = NULL;
 202     ext_oct->length = ext_len;
 203
 204     ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct);
 205     if (!ext)
 206         goto merr;
 207     ASN1_OCTET_STRING_free(ext_oct);
 208
 209     return ext;
 210
 211  merr:
 212     X509V3err(X509V3_F_DO_EXT_I2D, ERR_R_MALLOC_FAILURE);
 213     OPENSSL_free(ext_der);
 214     ASN1_OCTET_STRING_free(ext_oct);
 215     return NULL;
 216
 217 }
 218
 219 /* Given an internal structure, nid and critical flag create an extension */
 220
 221 X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc)
 222 {
 223     const X509V3_EXT_METHOD *method;
 224     if (!(method = X509V3_EXT_get_nid(ext_nid))) {
 225         X509V3err(X509V3_F_X509V3_EXT_I2D, X509V3_R_UNKNOWN_EXTENSION);
 226         return NULL;
 227     }
 228     return do_ext_i2d(method, ext_nid, crit, ext_struc);
 229 }
 230
 231 /* Check the extension string for critical flag */
 232 static int v3_check_critical(char **value)
 233 {
 234     char *p = *value;
 235     if ((strlen(p) < 9) || strncmp(p, "critical,", 9))
 236         return 0;
 237     p += 9;
 238     while (isspace((unsigned char)*p))
 239         p++;
 240     *value = p;
 241     return 1;
 242 }
 243
 244 /* Check extension string for generic extension and return the type */
 245 static int v3_check_generic(char **value)
 246 {
 247     int gen_type = 0;
 248     char *p = *value;
 249     if ((strlen(p) >= 4) && !strncmp(p, "DER:", 4)) {
 250         p += 4;
 251         gen_type = 1;
 252     } else if ((strlen(p) >= 5) && !strncmp(p, "ASN1:", 5)) {
 253         p += 5;
 254         gen_type = 2;
 255     } else
 256         return 0;
 257
 258     while (isspace((unsigned char)*p))
 259         p++;
 260     *value = p;
 261     return gen_type;
 262 }
 263
 264 /* Create a generic extension: for now just handle DER type */
 265 static X509_EXTENSION *v3_generic_extension(const char *ext, char *value,
 266                                             int crit, int gen_type,
 267                                             X509V3_CTX *ctx)
 268 {
 269     unsigned char *ext_der = NULL;
 270     long ext_len;
 271     ASN1_OBJECT *obj = NULL;
 272     ASN1_OCTET_STRING *oct = NULL;
 273     X509_EXTENSION *extension = NULL;
 274     if (!(obj = OBJ_txt2obj(ext, 0))) {
 275         X509V3err(X509V3_F_V3_GENERIC_EXTENSION,
 276                   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 = string_to_hex(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         X509V3err(X509V3_F_V3_GENERIC_EXTENSION,
 288                   X509V3_R_EXTENSION_VALUE_ERROR);
 289         ERR_add_error_data(2, "value=", value);
 290         goto err;
 291     }
 292
 293     if (!(oct = ASN1_OCTET_STRING_new())) {
 294         X509V3err(X509V3_F_V3_GENERIC_EXTENSION, ERR_R_MALLOC_FAILURE);
 295         goto err;
 296     }
 297
 298     oct->data = ext_der;
 299     oct->length = ext_len;
 300     ext_der = NULL;
 301
 302     extension = X509_EXTENSION_create_by_OBJ(NULL, obj, crit, oct);
 303
 304  err:
 305     ASN1_OBJECT_free(obj);
 306     ASN1_OCTET_STRING_free(oct);
 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 static void delete_ext(STACK_OF(X509_EXTENSION) *sk, X509_EXTENSION *dext)
 326 {
 327     int idx;
 328     ASN1_OBJECT *obj;
 329     obj = X509_EXTENSION_get_object(dext);
 330     while ((idx = X509v3_get_ext_by_OBJ(sk, obj, -1)) >= 0) {
 331         X509_EXTENSION *tmpext = X509v3_get_ext(sk, idx);
 332         X509v3_delete_ext(sk, idx);
 333         X509_EXTENSION_free(tmpext);
 334     }
 335 }
 336
 337 /*
 338  * This is the main function: add a bunch of extensions based on a config
 339  * file section to an extension STACK.
 340  */
 341
 342 int X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, char *section,
 343                             STACK_OF(X509_EXTENSION) **sk)
 344 {
 345     X509_EXTENSION *ext;
 346     STACK_OF(CONF_VALUE) *nval;
 347     CONF_VALUE *val;
 348     int i;
 349     if (!(nval = NCONF_get_section(conf, section)))
 350         return 0;
 351     for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
 352         val = sk_CONF_VALUE_value(nval, i);
 353         if (!(ext = X509V3_EXT_nconf(conf, ctx, val->name, val->value)))
 354             return 0;
 355         if (ctx->flags == X509V3_CTX_REPLACE)
 356             delete_ext(*sk, ext);
 357         if (sk)
 358             X509v3_add_ext(sk, ext, -1);
 359         X509_EXTENSION_free(ext);
 360     }
 361     return 1;
 362 }
 363
 364 /*
 365  * Convenience functions to add extensions to a certificate, CRL and request
 366  */
 367
 368 int X509V3_EXT_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section,
 369                          X509 *cert)
 370 {
 371     STACK_OF(X509_EXTENSION) **sk = NULL;
 372     if (cert)
 373         sk = &cert->cert_info->extensions;
 374     return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
 375 }
 376
 377 /* Same as above but for a CRL */
 378
 379 int X509V3_EXT_CRL_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section,
 380                              X509_CRL *crl)
 381 {
 382     STACK_OF(X509_EXTENSION) **sk = NULL;
 383     if (crl)
 384         sk = &crl->crl->extensions;
 385     return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
 386 }
 387
 388 /* Add extensions to certificate request */
 389
 390 int X509V3_EXT_REQ_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section,
 391                              X509_REQ *req)
 392 {
 393     STACK_OF(X509_EXTENSION) *extlist = NULL, **sk = NULL;
 394     int i;
 395     if (req)
 396         sk = &extlist;
 397     i = X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
 398     if (!i || !sk)
 399         return i;
 400     i = X509_REQ_add_extensions(req, extlist);
 401     sk_X509_EXTENSION_pop_free(extlist, X509_EXTENSION_free);
 402     return i;
 403 }
 404
 405 /* Config database functions */
 406
 407 char *X509V3_get_string(X509V3_CTX *ctx, char *name, char *section)
 408 {
 409     if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_string) {
 410         X509V3err(X509V3_F_X509V3_GET_STRING, X509V3_R_OPERATION_NOT_DEFINED);
 411         return NULL;
 412     }
 413     if (ctx->db_meth->get_string)
 414         return ctx->db_meth->get_string(ctx->db, name, section);
 415     return NULL;
 416 }
 417
 418 STACK_OF(CONF_VALUE) *X509V3_get_section(X509V3_CTX *ctx, char *section)
 419 {
 420     if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_section) {
 421         X509V3err(X509V3_F_X509V3_GET_SECTION,
 422                   X509V3_R_OPERATION_NOT_DEFINED);
 423         return NULL;
 424     }
 425     if (ctx->db_meth->get_section)
 426         return ctx->db_meth->get_section(ctx->db, section);
 427     return NULL;
 428 }
 429
 430 void X509V3_string_free(X509V3_CTX *ctx, char *str)
 431 {
 432     if (!str)
 433         return;
 434     if (ctx->db_meth->free_string)
 435         ctx->db_meth->free_string(ctx->db, str);
 436 }
 437
 438 void X509V3_section_free(X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *section)
 439 {
 440     if (!section)
 441         return;
 442     if (ctx->db_meth->free_section)
 443         ctx->db_meth->free_section(ctx->db, section);
 444 }
 445
 446 static char *nconf_get_string(void *db, char *section, char *value)
 447 {
 448     return NCONF_get_string(db, section, value);
 449 }
 450
 451 static STACK_OF(CONF_VALUE) *nconf_get_section(void *db, char *section)
 452 {
 453     return NCONF_get_section(db, section);
 454 }
 455
 456 static X509V3_CONF_METHOD nconf_method = {
 457     nconf_get_string,
 458     nconf_get_section,
 459     NULL,
 460     NULL
 461 };
 462
 463 void X509V3_set_nconf(X509V3_CTX *ctx, CONF *conf)
 464 {
 465     ctx->db_meth = &nconf_method;
 466     ctx->db = conf;
 467 }
 468
 469 void X509V3_set_ctx(X509V3_CTX *ctx, X509 *issuer, X509 *subj, X509_REQ *req,
 470                     X509_CRL *crl, int flags)
 471 {
 472     ctx->issuer_cert = issuer;
 473     ctx->subject_cert = subj;
 474     ctx->crl = crl;
 475     ctx->subject_req = req;
 476     ctx->flags = flags;
 477 }
 478
 479 /* Old conf compatibility functions */
 480
 481 X509_EXTENSION *X509V3_EXT_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
 482                                 char *name, char *value)
 483 {
 484     CONF ctmp;
 485     CONF_set_nconf(&ctmp, conf);
 486     return X509V3_EXT_nconf(&ctmp, ctx, name, value);
 487 }
 488
 489 /* LHASH *conf:  Config file    */
 490 /* char *value:  Value    */
 491 X509_EXTENSION *X509V3_EXT_conf_nid(LHASH_OF(CONF_VALUE) *conf,
 492                                     X509V3_CTX *ctx, int ext_nid, char *value)
 493 {
 494     CONF ctmp;
 495     CONF_set_nconf(&ctmp, conf);
 496     return X509V3_EXT_nconf_nid(&ctmp, ctx, ext_nid, value);
 497 }
 498
 499 static char *conf_lhash_get_string(void *db, char *section, char *value)
 500 {
 501     return CONF_get_string(db, section, value);
 502 }
 503
 504 static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, char *section)
 505 {
 506     return CONF_get_section(db, section);
 507 }
 508
 509 static X509V3_CONF_METHOD conf_lhash_method = {
 510     conf_lhash_get_string,
 511     conf_lhash_get_section,
 512     NULL,
 513     NULL
 514 };
 515
 516 void X509V3_set_conf_lhash(X509V3_CTX *ctx, LHASH_OF(CONF_VALUE) *lhash)
 517 {
 518     ctx->db_meth = &conf_lhash_method;
 519     ctx->db = lhash;
 520 }
 521
 522 int X509V3_EXT_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
 523                         char *section, X509 *cert)
 524 {
 525     CONF ctmp;
 526     CONF_set_nconf(&ctmp, conf);
 527     return X509V3_EXT_add_nconf(&ctmp, ctx, section, cert);
 528 }
 529
 530 /* Same as above but for a CRL */
 531
 532 int X509V3_EXT_CRL_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
 533                             char *section, X509_CRL *crl)
 534 {
 535     CONF ctmp;
 536     CONF_set_nconf(&ctmp, conf);
 537     return X509V3_EXT_CRL_add_nconf(&ctmp, ctx, section, crl);
 538 }
 539
 540 /* Add extensions to certificate request */
 541
 542 int X509V3_EXT_REQ_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
 543                             char *section, X509_REQ *req)
 544 {
 545     CONF ctmp;
 546     CONF_set_nconf(&ctmp, conf);
 547     return X509V3_EXT_REQ_add_nconf(&ctmp, ctx, section, req);
 548 }