crypto/x509v3/v3_conf.c

   1 /*
   2  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   3  * 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 <stdio.h>
  61 #include <ctype.h>
  62 #include "internal/cryptlib.h"
  63 #include <openssl/conf.h>
  64 #include <openssl/x509.h>
  65 #include "internal/x509_int.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
 125     if (ext_nid == NID_undef) {
 126         X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_UNKNOWN_EXTENSION_NAME);
 127         return NULL;
 128     }
 129     if ((method = X509V3_EXT_get_nid(ext_nid)) == NULL) {
 130         X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_UNKNOWN_EXTENSION);
 131         return NULL;
 132     }
 133     /* Now get internal extension representation based on type */
 134     if (method->v2i) {
 135         if (*value == '@')
 136             nval = NCONF_get_section(conf, value + 1);
 137         else
 138             nval = X509V3_parse_list(value);
 139         if (sk_CONF_VALUE_num(nval) <= 0) {
 140             X509V3err(X509V3_F_DO_EXT_NCONF,
 141                       X509V3_R_INVALID_EXTENSION_STRING);
 142             ERR_add_error_data(4, "name=", OBJ_nid2sn(ext_nid), ",section=",
 143                                value);
 144             return NULL;
 145         }
 146         ext_struc = method->v2i(method, ctx, nval);
 147         if (*value != '@')
 148             sk_CONF_VALUE_pop_free(nval, X509V3_conf_free);
 149         if (!ext_struc)
 150             return NULL;
 151     } else if (method->s2i) {
 152         if ((ext_struc = method->s2i(method, ctx, value)) == NULL)
 153             return NULL;
 154     } else if (method->r2i) {
 155         if (!ctx->db || !ctx->db_meth) {
 156             X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_NO_CONFIG_DATABASE);
 157             return NULL;
 158         }
 159         if ((ext_struc = method->r2i(method, ctx, value)) == NULL)
 160             return NULL;
 161     } else {
 162         X509V3err(X509V3_F_DO_EXT_NCONF,
 163                   X509V3_R_EXTENSION_SETTING_NOT_SUPPORTED);
 164         ERR_add_error_data(2, "name=", OBJ_nid2sn(ext_nid));
 165         return NULL;
 166     }
 167
 168     ext = do_ext_i2d(method, ext_nid, crit, ext_struc);
 169     if (method->it)
 170         ASN1_item_free(ext_struc, ASN1_ITEM_ptr(method->it));
 171     else
 172         method->ext_free(ext_struc);
 173     return ext;
 174
 175 }
 176
 177 static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method,
 178                                   int ext_nid, int crit, void *ext_struc)
 179 {
 180     unsigned char *ext_der = NULL;
 181     int ext_len;
 182     ASN1_OCTET_STRING *ext_oct = NULL;
 183     X509_EXTENSION *ext;
 184     /* Convert internal representation to DER */
 185     if (method->it) {
 186         ext_der = NULL;
 187         ext_len =
 188             ASN1_item_i2d(ext_struc, &ext_der, ASN1_ITEM_ptr(method->it));
 189         if (ext_len < 0)
 190             goto merr;
 191     } else {
 192         unsigned char *p;
 193
 194         ext_len = method->i2d(ext_struc, NULL);
 195         if ((ext_der = OPENSSL_malloc(ext_len)) == NULL)
 196             goto merr;
 197         p = ext_der;
 198         method->i2d(ext_struc, &p);
 199     }
 200     if ((ext_oct = ASN1_OCTET_STRING_new()) == NULL)
 201         goto merr;
 202     ext_oct->data = ext_der;
 203     ext_der = NULL;
 204     ext_oct->length = ext_len;
 205
 206     ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct);
 207     if (!ext)
 208         goto merr;
 209     ASN1_OCTET_STRING_free(ext_oct);
 210
 211     return ext;
 212
 213  merr:
 214     X509V3err(X509V3_F_DO_EXT_I2D, ERR_R_MALLOC_FAILURE);
 215     OPENSSL_free(ext_der);
 216     ASN1_OCTET_STRING_free(ext_oct);
 217     return NULL;
 218
 219 }
 220
 221 /* Given an internal structure, nid and critical flag create an extension */
 222
 223 X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc)
 224 {
 225     const X509V3_EXT_METHOD *method;
 226
 227     if ((method = X509V3_EXT_get_nid(ext_nid)) == NULL) {
 228         X509V3err(X509V3_F_X509V3_EXT_I2D, X509V3_R_UNKNOWN_EXTENSION);
 229         return NULL;
 230     }
 231     return do_ext_i2d(method, ext_nid, crit, ext_struc);
 232 }
 233
 234 /* Check the extension string for critical flag */
 235 static int v3_check_critical(char **value)
 236 {
 237     char *p = *value;
 238     if ((strlen(p) < 9) || strncmp(p, "critical,", 9))
 239         return 0;
 240     p += 9;
 241     while (isspace((unsigned char)*p))
 242         p++;
 243     *value = p;
 244     return 1;
 245 }
 246
 247 /* Check extension string for generic extension and return the type */
 248 static int v3_check_generic(char **value)
 249 {
 250     int gen_type = 0;
 251     char *p = *value;
 252     if ((strlen(p) >= 4) && strncmp(p, "DER:", 4) == 0) {
 253         p += 4;
 254         gen_type = 1;
 255     } else if ((strlen(p) >= 5) && strncmp(p, "ASN1:", 5) == 0) {
 256         p += 5;
 257         gen_type = 2;
 258     } else
 259         return 0;
 260
 261     while (isspace((unsigned char)*p))
 262         p++;
 263     *value = p;
 264     return gen_type;
 265 }
 266
 267 /* Create a generic extension: for now just handle DER type */
 268 static X509_EXTENSION *v3_generic_extension(const char *ext, char *value,
 269                                             int crit, int gen_type,
 270                                             X509V3_CTX *ctx)
 271 {
 272     unsigned char *ext_der = NULL;
 273     long ext_len = 0;
 274     ASN1_OBJECT *obj = NULL;
 275     ASN1_OCTET_STRING *oct = NULL;
 276     X509_EXTENSION *extension = NULL;
 277
 278     if ((obj = OBJ_txt2obj(ext, 0)) == NULL) {
 279         X509V3err(X509V3_F_V3_GENERIC_EXTENSION,
 280                   X509V3_R_EXTENSION_NAME_ERROR);
 281         ERR_add_error_data(2, "name=", ext);
 282         goto err;
 283     }
 284
 285     if (gen_type == 1)
 286         ext_der = OPENSSL_hexstr2buf(value, &ext_len);
 287     else if (gen_type == 2)
 288         ext_der = generic_asn1(value, ctx, &ext_len);
 289
 290     if (ext_der == NULL) {
 291         X509V3err(X509V3_F_V3_GENERIC_EXTENSION,
 292                   X509V3_R_EXTENSION_VALUE_ERROR);
 293         ERR_add_error_data(2, "value=", value);
 294         goto err;
 295     }
 296
 297     if ((oct = ASN1_OCTET_STRING_new()) == NULL) {
 298         X509V3err(X509V3_F_V3_GENERIC_EXTENSION, ERR_R_MALLOC_FAILURE);
 299         goto err;
 300     }
 301
 302     oct->data = ext_der;
 303     oct->length = ext_len;
 304     ext_der = NULL;
 305
 306     extension = X509_EXTENSION_create_by_OBJ(NULL, obj, crit, oct);
 307
 308  err:
 309     ASN1_OBJECT_free(obj);
 310     ASN1_OCTET_STRING_free(oct);
 311     OPENSSL_free(ext_der);
 312     return extension;
 313
 314 }
 315
 316 static unsigned char *generic_asn1(char *value, X509V3_CTX *ctx,
 317                                    long *ext_len)
 318 {
 319     ASN1_TYPE *typ;
 320     unsigned char *ext_der = NULL;
 321     typ = ASN1_generate_v3(value, ctx);
 322     if (typ == NULL)
 323         return NULL;
 324     *ext_len = i2d_ASN1_TYPE(typ, &ext_der);
 325     ASN1_TYPE_free(typ);
 326     return ext_der;
 327 }
 328
 329 static void delete_ext(STACK_OF(X509_EXTENSION) *sk, X509_EXTENSION *dext)
 330 {
 331     int idx;
 332     ASN1_OBJECT *obj;
 333     obj = X509_EXTENSION_get_object(dext);
 334     while ((idx = X509v3_get_ext_by_OBJ(sk, obj, -1)) >= 0) {
 335         X509_EXTENSION *tmpext = X509v3_get_ext(sk, idx);
 336         X509v3_delete_ext(sk, idx);
 337         X509_EXTENSION_free(tmpext);
 338     }
 339 }
 340
 341 /*
 342  * This is the main function: add a bunch of extensions based on a config
 343  * file section to an extension STACK.
 344  */
 345
 346 int X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, char *section,
 347                             STACK_OF(X509_EXTENSION) **sk)
 348 {
 349     X509_EXTENSION *ext;
 350     STACK_OF(CONF_VALUE) *nval;
 351     CONF_VALUE *val;
 352     int i;
 353
 354     if ((nval = NCONF_get_section(conf, section)) == NULL)
 355         return 0;
 356     for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
 357         val = sk_CONF_VALUE_value(nval, i);
 358         if ((ext = X509V3_EXT_nconf(conf, ctx, val->name, val->value)) == NULL)
 359             return 0;
 360         if (ctx->flags == X509V3_CTX_REPLACE)
 361             delete_ext(*sk, ext);
 362         if (sk)
 363             X509v3_add_ext(sk, ext, -1);
 364         X509_EXTENSION_free(ext);
 365     }
 366     return 1;
 367 }
 368
 369 /*
 370  * Convenience functions to add extensions to a certificate, CRL and request
 371  */
 372
 373 int X509V3_EXT_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section,
 374                          X509 *cert)
 375 {
 376     STACK_OF(X509_EXTENSION) **sk = NULL;
 377     if (cert)
 378         sk = &cert->cert_info.extensions;
 379     return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
 380 }
 381
 382 /* Same as above but for a CRL */
 383
 384 int X509V3_EXT_CRL_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section,
 385                              X509_CRL *crl)
 386 {
 387     STACK_OF(X509_EXTENSION) **sk = NULL;
 388     if (crl)
 389         sk = &crl->crl.extensions;
 390     return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
 391 }
 392
 393 /* Add extensions to certificate request */
 394
 395 int X509V3_EXT_REQ_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section,
 396                              X509_REQ *req)
 397 {
 398     STACK_OF(X509_EXTENSION) *extlist = NULL, **sk = NULL;
 399     int i;
 400     if (req)
 401         sk = &extlist;
 402     i = X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
 403     if (!i || !sk)
 404         return i;
 405     i = X509_REQ_add_extensions(req, extlist);
 406     sk_X509_EXTENSION_pop_free(extlist, X509_EXTENSION_free);
 407     return i;
 408 }
 409
 410 /* Config database functions */
 411
 412 char *X509V3_get_string(X509V3_CTX *ctx, char *name, char *section)
 413 {
 414     if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_string) {
 415         X509V3err(X509V3_F_X509V3_GET_STRING, X509V3_R_OPERATION_NOT_DEFINED);
 416         return NULL;
 417     }
 418     if (ctx->db_meth->get_string)
 419         return ctx->db_meth->get_string(ctx->db, name, section);
 420     return NULL;
 421 }
 422
 423 STACK_OF(CONF_VALUE) *X509V3_get_section(X509V3_CTX *ctx, char *section)
 424 {
 425     if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_section) {
 426         X509V3err(X509V3_F_X509V3_GET_SECTION,
 427                   X509V3_R_OPERATION_NOT_DEFINED);
 428         return NULL;
 429     }
 430     if (ctx->db_meth->get_section)
 431         return ctx->db_meth->get_section(ctx->db, section);
 432     return NULL;
 433 }
 434
 435 void X509V3_string_free(X509V3_CTX *ctx, char *str)
 436 {
 437     if (!str)
 438         return;
 439     if (ctx->db_meth->free_string)
 440         ctx->db_meth->free_string(ctx->db, str);
 441 }
 442
 443 void 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 *nconf_get_string(void *db, char *section, char *value)
 452 {
 453     return NCONF_get_string(db, section, value);
 454 }
 455
 456 static STACK_OF(CONF_VALUE) *nconf_get_section(void *db, char *section)
 457 {
 458     return NCONF_get_section(db, section);
 459 }
 460
 461 static X509V3_CONF_METHOD nconf_method = {
 462     nconf_get_string,
 463     nconf_get_section,
 464     NULL,
 465     NULL
 466 };
 467
 468 void X509V3_set_nconf(X509V3_CTX *ctx, CONF *conf)
 469 {
 470     ctx->db_meth = &nconf_method;
 471     ctx->db = conf;
 472 }
 473
 474 void X509V3_set_ctx(X509V3_CTX *ctx, X509 *issuer, X509 *subj, X509_REQ *req,
 475                     X509_CRL *crl, int flags)
 476 {
 477     ctx->issuer_cert = issuer;
 478     ctx->subject_cert = subj;
 479     ctx->crl = crl;
 480     ctx->subject_req = req;
 481     ctx->flags = flags;
 482 }
 483
 484 /* Old conf compatibility functions */
 485
 486 X509_EXTENSION *X509V3_EXT_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
 487                                 char *name, char *value)
 488 {
 489     CONF ctmp;
 490     CONF_set_nconf(&ctmp, conf);
 491     return X509V3_EXT_nconf(&ctmp, ctx, name, value);
 492 }
 493
 494 /* LHASH *conf:  Config file    */
 495 /* char *value:  Value    */
 496 X509_EXTENSION *X509V3_EXT_conf_nid(LHASH_OF(CONF_VALUE) *conf,
 497                                     X509V3_CTX *ctx, int ext_nid, char *value)
 498 {
 499     CONF ctmp;
 500     CONF_set_nconf(&ctmp, conf);
 501     return X509V3_EXT_nconf_nid(&ctmp, ctx, ext_nid, value);
 502 }
 503
 504 static char *conf_lhash_get_string(void *db, char *section, char *value)
 505 {
 506     return CONF_get_string(db, section, value);
 507 }
 508
 509 static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, char *section)
 510 {
 511     return CONF_get_section(db, section);
 512 }
 513
 514 static X509V3_CONF_METHOD conf_lhash_method = {
 515     conf_lhash_get_string,
 516     conf_lhash_get_section,
 517     NULL,
 518     NULL
 519 };
 520
 521 void X509V3_set_conf_lhash(X509V3_CTX *ctx, LHASH_OF(CONF_VALUE) *lhash)
 522 {
 523     ctx->db_meth = &conf_lhash_method;
 524     ctx->db = lhash;
 525 }
 526
 527 int X509V3_EXT_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
 528                         char *section, X509 *cert)
 529 {
 530     CONF ctmp;
 531     CONF_set_nconf(&ctmp, conf);
 532     return X509V3_EXT_add_nconf(&ctmp, ctx, section, cert);
 533 }
 534
 535 /* Same as above but for a CRL */
 536
 537 int X509V3_EXT_CRL_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
 538                             char *section, X509_CRL *crl)
 539 {
 540     CONF ctmp;
 541     CONF_set_nconf(&ctmp, conf);
 542     return X509V3_EXT_CRL_add_nconf(&ctmp, ctx, section, crl);
 543 }
 544
 545 /* Add extensions to certificate request */
 546
 547 int X509V3_EXT_REQ_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
 548                             char *section, X509_REQ *req)
 549 {
 550     CONF ctmp;
 551     CONF_set_nconf(&ctmp, conf);
 552     return X509V3_EXT_REQ_add_nconf(&ctmp, ctx, section, req);
 553 }