crypto/ocsp/ocsp_ext.c

   1 /* ocsp_ext.c */
   2 /*
   3  * Written by Tom Titchener <Tom_Titchener@groove.net> for the OpenSSL
   4  * project.
   5  */
   6
   7 /*
   8  * History: This file was transfered to Richard Levitte from CertCo by Kathy
   9  * Weinhold in mid-spring 2000 to be included in OpenSSL or released as a
  10  * patch kit.
  11  */
  12
  13 /* ====================================================================
  14  * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.
  15  *
  16  * Redistribution and use in source and binary forms, with or without
  17  * modification, are permitted provided that the following conditions
  18  * are met:
  19  *
  20  * 1. Redistributions of source code must retain the above copyright
  21  *    notice, this list of conditions and the following disclaimer.
  22  *
  23  * 2. Redistributions in binary form must reproduce the above copyright
  24  *    notice, this list of conditions and the following disclaimer in
  25  *    the documentation and/or other materials provided with the
  26  *    distribution.
  27  *
  28  * 3. All advertising materials mentioning features or use of this
  29  *    software must display the following acknowledgment:
  30  *    "This product includes software developed by the OpenSSL Project
  31  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  32  *
  33  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  34  *    endorse or promote products derived from this software without
  35  *    prior written permission. For written permission, please contact
  36  *    openssl-core@openssl.org.
  37  *
  38  * 5. Products derived from this software may not be called "OpenSSL"
  39  *    nor may "OpenSSL" appear in their names without prior written
  40  *    permission of the OpenSSL Project.
  41  *
  42  * 6. Redistributions of any form whatsoever must retain the following
  43  *    acknowledgment:
  44  *    "This product includes software developed by the OpenSSL Project
  45  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  46  *
  47  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  48  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  49  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  50  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  51  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  52  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  53  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  54  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  56  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  57  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  58  * OF THE POSSIBILITY OF SUCH DAMAGE.
  59  * ====================================================================
  60  *
  61  * This product includes cryptographic software written by Eric Young
  62  * (eay@cryptsoft.com).  This product includes software written by Tim
  63  * Hudson (tjh@cryptsoft.com).
  64  *
  65  */
  66
  67 #include <stdio.h>
  68 #include <cryptlib.h>
  69 #include <openssl/objects.h>
  70 #include <openssl/x509.h>
  71 #include <openssl/ocsp.h>
  72 #include "ocsp_lcl.h"
  73 #include <openssl/rand.h>
  74 #include <openssl/x509v3.h>
  75
  76 /* Standard wrapper functions for extensions */
  77
  78 /* OCSP request extensions */
  79
  80 int OCSP_REQUEST_get_ext_count(OCSP_REQUEST *x)
  81 {
  82     return (X509v3_get_ext_count(x->tbsRequest->requestExtensions));
  83 }
  84
  85 int OCSP_REQUEST_get_ext_by_NID(OCSP_REQUEST *x, int nid, int lastpos)
  86 {
  87     return (X509v3_get_ext_by_NID
  88             (x->tbsRequest->requestExtensions, nid, lastpos));
  89 }
  90
  91 int OCSP_REQUEST_get_ext_by_OBJ(OCSP_REQUEST *x, ASN1_OBJECT *obj,
  92                                 int lastpos)
  93 {
  94     return (X509v3_get_ext_by_OBJ
  95             (x->tbsRequest->requestExtensions, obj, lastpos));
  96 }
  97
  98 int OCSP_REQUEST_get_ext_by_critical(OCSP_REQUEST *x, int crit, int lastpos)
  99 {
 100     return (X509v3_get_ext_by_critical
 101             (x->tbsRequest->requestExtensions, crit, lastpos));
 102 }
 103
 104 X509_EXTENSION *OCSP_REQUEST_get_ext(OCSP_REQUEST *x, int loc)
 105 {
 106     return (X509v3_get_ext(x->tbsRequest->requestExtensions, loc));
 107 }
 108
 109 X509_EXTENSION *OCSP_REQUEST_delete_ext(OCSP_REQUEST *x, int loc)
 110 {
 111     return (X509v3_delete_ext(x->tbsRequest->requestExtensions, loc));
 112 }
 113
 114 void *OCSP_REQUEST_get1_ext_d2i(OCSP_REQUEST *x, int nid, int *crit, int *idx)
 115 {
 116     return X509V3_get_d2i(x->tbsRequest->requestExtensions, nid, crit, idx);
 117 }
 118
 119 int OCSP_REQUEST_add1_ext_i2d(OCSP_REQUEST *x, int nid, void *value, int crit,
 120                               unsigned long flags)
 121 {
 122     return X509V3_add1_i2d(&x->tbsRequest->requestExtensions, nid, value,
 123                            crit, flags);
 124 }
 125
 126 int OCSP_REQUEST_add_ext(OCSP_REQUEST *x, X509_EXTENSION *ex, int loc)
 127 {
 128     return (X509v3_add_ext(&(x->tbsRequest->requestExtensions), ex, loc) !=
 129             NULL);
 130 }
 131
 132 /* Single extensions */
 133
 134 int OCSP_ONEREQ_get_ext_count(OCSP_ONEREQ *x)
 135 {
 136     return (X509v3_get_ext_count(x->singleRequestExtensions));
 137 }
 138
 139 int OCSP_ONEREQ_get_ext_by_NID(OCSP_ONEREQ *x, int nid, int lastpos)
 140 {
 141     return (X509v3_get_ext_by_NID(x->singleRequestExtensions, nid, lastpos));
 142 }
 143
 144 int OCSP_ONEREQ_get_ext_by_OBJ(OCSP_ONEREQ *x, ASN1_OBJECT *obj, int lastpos)
 145 {
 146     return (X509v3_get_ext_by_OBJ(x->singleRequestExtensions, obj, lastpos));
 147 }
 148
 149 int OCSP_ONEREQ_get_ext_by_critical(OCSP_ONEREQ *x, int crit, int lastpos)
 150 {
 151     return (X509v3_get_ext_by_critical
 152             (x->singleRequestExtensions, crit, lastpos));
 153 }
 154
 155 X509_EXTENSION *OCSP_ONEREQ_get_ext(OCSP_ONEREQ *x, int loc)
 156 {
 157     return (X509v3_get_ext(x->singleRequestExtensions, loc));
 158 }
 159
 160 X509_EXTENSION *OCSP_ONEREQ_delete_ext(OCSP_ONEREQ *x, int loc)
 161 {
 162     return (X509v3_delete_ext(x->singleRequestExtensions, loc));
 163 }
 164
 165 void *OCSP_ONEREQ_get1_ext_d2i(OCSP_ONEREQ *x, int nid, int *crit, int *idx)
 166 {
 167     return X509V3_get_d2i(x->singleRequestExtensions, nid, crit, idx);
 168 }
 169
 170 int OCSP_ONEREQ_add1_ext_i2d(OCSP_ONEREQ *x, int nid, void *value, int crit,
 171                              unsigned long flags)
 172 {
 173     return X509V3_add1_i2d(&x->singleRequestExtensions, nid, value, crit,
 174                            flags);
 175 }
 176
 177 int OCSP_ONEREQ_add_ext(OCSP_ONEREQ *x, X509_EXTENSION *ex, int loc)
 178 {
 179     return (X509v3_add_ext(&(x->singleRequestExtensions), ex, loc) != NULL);
 180 }
 181
 182 /* OCSP Basic response */
 183
 184 int OCSP_BASICRESP_get_ext_count(OCSP_BASICRESP *x)
 185 {
 186     return (X509v3_get_ext_count(x->tbsResponseData->responseExtensions));
 187 }
 188
 189 int OCSP_BASICRESP_get_ext_by_NID(OCSP_BASICRESP *x, int nid, int lastpos)
 190 {
 191     return (X509v3_get_ext_by_NID
 192             (x->tbsResponseData->responseExtensions, nid, lastpos));
 193 }
 194
 195 int OCSP_BASICRESP_get_ext_by_OBJ(OCSP_BASICRESP *x, ASN1_OBJECT *obj,
 196                                   int lastpos)
 197 {
 198     return (X509v3_get_ext_by_OBJ
 199             (x->tbsResponseData->responseExtensions, obj, lastpos));
 200 }
 201
 202 int OCSP_BASICRESP_get_ext_by_critical(OCSP_BASICRESP *x, int crit,
 203                                        int lastpos)
 204 {
 205     return (X509v3_get_ext_by_critical
 206             (x->tbsResponseData->responseExtensions, crit, lastpos));
 207 }
 208
 209 X509_EXTENSION *OCSP_BASICRESP_get_ext(OCSP_BASICRESP *x, int loc)
 210 {
 211     return (X509v3_get_ext(x->tbsResponseData->responseExtensions, loc));
 212 }
 213
 214 X509_EXTENSION *OCSP_BASICRESP_delete_ext(OCSP_BASICRESP *x, int loc)
 215 {
 216     return (X509v3_delete_ext(x->tbsResponseData->responseExtensions, loc));
 217 }
 218
 219 void *OCSP_BASICRESP_get1_ext_d2i(OCSP_BASICRESP *x, int nid, int *crit,
 220                                   int *idx)
 221 {
 222     return X509V3_get_d2i(x->tbsResponseData->responseExtensions, nid, crit,
 223                           idx);
 224 }
 225
 226 int OCSP_BASICRESP_add1_ext_i2d(OCSP_BASICRESP *x, int nid, void *value,
 227                                 int crit, unsigned long flags)
 228 {
 229     return X509V3_add1_i2d(&x->tbsResponseData->responseExtensions, nid,
 230                            value, crit, flags);
 231 }
 232
 233 int OCSP_BASICRESP_add_ext(OCSP_BASICRESP *x, X509_EXTENSION *ex, int loc)
 234 {
 235     return (X509v3_add_ext(&(x->tbsResponseData->responseExtensions), ex, loc)
 236             != NULL);
 237 }
 238
 239 /* OCSP single response extensions */
 240
 241 int OCSP_SINGLERESP_get_ext_count(OCSP_SINGLERESP *x)
 242 {
 243     return (X509v3_get_ext_count(x->singleExtensions));
 244 }
 245
 246 int OCSP_SINGLERESP_get_ext_by_NID(OCSP_SINGLERESP *x, int nid, int lastpos)
 247 {
 248     return (X509v3_get_ext_by_NID(x->singleExtensions, nid, lastpos));
 249 }
 250
 251 int OCSP_SINGLERESP_get_ext_by_OBJ(OCSP_SINGLERESP *x, ASN1_OBJECT *obj,
 252                                    int lastpos)
 253 {
 254     return (X509v3_get_ext_by_OBJ(x->singleExtensions, obj, lastpos));
 255 }
 256
 257 int OCSP_SINGLERESP_get_ext_by_critical(OCSP_SINGLERESP *x, int crit,
 258                                         int lastpos)
 259 {
 260     return (X509v3_get_ext_by_critical(x->singleExtensions, crit, lastpos));
 261 }
 262
 263 X509_EXTENSION *OCSP_SINGLERESP_get_ext(OCSP_SINGLERESP *x, int loc)
 264 {
 265     return (X509v3_get_ext(x->singleExtensions, loc));
 266 }
 267
 268 X509_EXTENSION *OCSP_SINGLERESP_delete_ext(OCSP_SINGLERESP *x, int loc)
 269 {
 270     return (X509v3_delete_ext(x->singleExtensions, loc));
 271 }
 272
 273 void *OCSP_SINGLERESP_get1_ext_d2i(OCSP_SINGLERESP *x, int nid, int *crit,
 274                                    int *idx)
 275 {
 276     return X509V3_get_d2i(x->singleExtensions, nid, crit, idx);
 277 }
 278
 279 int OCSP_SINGLERESP_add1_ext_i2d(OCSP_SINGLERESP *x, int nid, void *value,
 280                                  int crit, unsigned long flags)
 281 {
 282     return X509V3_add1_i2d(&x->singleExtensions, nid, value, crit, flags);
 283 }
 284
 285 int OCSP_SINGLERESP_add_ext(OCSP_SINGLERESP *x, X509_EXTENSION *ex, int loc)
 286 {
 287     return (X509v3_add_ext(&(x->singleExtensions), ex, loc) != NULL);
 288 }
 289
 290 /* also CRL Entry Extensions */
 291
 292 /* Nonce handling functions */
 293
 294 /*
 295  * Add a nonce to an extension stack. A nonce can be specificed or if NULL a
 296  * random nonce will be generated. Note: OpenSSL 0.9.7d and later create an
 297  * OCTET STRING containing the nonce, previous versions used the raw nonce.
 298  */
 299
 300 static int ocsp_add1_nonce(STACK_OF(X509_EXTENSION) **exts,
 301                            unsigned char *val, int len)
 302 {
 303     unsigned char *tmpval;
 304     ASN1_OCTET_STRING os;
 305     int ret = 0;
 306     if (len <= 0)
 307         len = OCSP_DEFAULT_NONCE_LENGTH;
 308     /*
 309      * Create the OCTET STRING manually by writing out the header and
 310      * appending the content octets. This avoids an extra memory allocation
 311      * operation in some cases. Applications should *NOT* do this because it
 312      * relies on library internals.
 313      */
 314     os.length = ASN1_object_size(0, len, V_ASN1_OCTET_STRING);
 315     os.data = OPENSSL_malloc(os.length);
 316     if (os.data == NULL)
 317         goto err;
 318     tmpval = os.data;
 319     ASN1_put_object(&tmpval, 0, len, V_ASN1_OCTET_STRING, V_ASN1_UNIVERSAL);
 320     if (val)
 321         memcpy(tmpval, val, len);
 322     else if (RAND_bytes(tmpval, len) <= 0)
 323         goto err;
 324     if (!X509V3_add1_i2d(exts, NID_id_pkix_OCSP_Nonce,
 325                          &os, 0, X509V3_ADD_REPLACE))
 326         goto err;
 327     ret = 1;
 328  err:
 329     if (os.data)
 330         OPENSSL_free(os.data);
 331     return ret;
 332 }
 333
 334 /* Add nonce to an OCSP request */
 335
 336 int OCSP_request_add1_nonce(OCSP_REQUEST *req, unsigned char *val, int len)
 337 {
 338     return ocsp_add1_nonce(&req->tbsRequest->requestExtensions, val, len);
 339 }
 340
 341 /* Same as above but for a response */
 342
 343 int OCSP_basic_add1_nonce(OCSP_BASICRESP *resp, unsigned char *val, int len)
 344 {
 345     return ocsp_add1_nonce(&resp->tbsResponseData->responseExtensions, val,
 346                            len);
 347 }
 348
 349 /*-
 350  * Check nonce validity in a request and response.
 351  * Return value reflects result:
 352  *  1: nonces present and equal.
 353  *  2: nonces both absent.
 354  *  3: nonce present in response only.
 355  *  0: nonces both present and not equal.
 356  * -1: nonce in request only.
 357  *
 358  *  For most responders clients can check return > 0.
 359  *  If responder doesn't handle nonces return != 0 may be
 360  *  necessary. return == 0 is always an error.
 361  */
 362
 363 int OCSP_check_nonce(OCSP_REQUEST *req, OCSP_BASICRESP *bs)
 364 {
 365     /*
 366      * Since we are only interested in the presence or absence of
 367      * the nonce and comparing its value there is no need to use
 368      * the X509V3 routines: this way we can avoid them allocating an
 369      * ASN1_OCTET_STRING structure for the value which would be
 370      * freed immediately anyway.
 371      */
 372
 373     int req_idx, resp_idx;
 374     X509_EXTENSION *req_ext, *resp_ext;
 375     req_idx = OCSP_REQUEST_get_ext_by_NID(req, NID_id_pkix_OCSP_Nonce, -1);
 376     resp_idx = OCSP_BASICRESP_get_ext_by_NID(bs, NID_id_pkix_OCSP_Nonce, -1);
 377     /* Check both absent */
 378     if ((req_idx < 0) && (resp_idx < 0))
 379         return 2;
 380     /* Check in request only */
 381     if ((req_idx >= 0) && (resp_idx < 0))
 382         return -1;
 383     /* Check in response but not request */
 384     if ((req_idx < 0) && (resp_idx >= 0))
 385         return 3;
 386     /*
 387      * Otherwise nonce in request and response so retrieve the extensions
 388      */
 389     req_ext = OCSP_REQUEST_get_ext(req, req_idx);
 390     resp_ext = OCSP_BASICRESP_get_ext(bs, resp_idx);
 391     if (ASN1_OCTET_STRING_cmp(X509_EXTENSION_get_data(req_ext),
 392                               X509_EXTENSION_get_data(resp_ext)))
 393         return 0;
 394     return 1;
 395 }
 396
 397 /*
 398  * Copy the nonce value (if any) from an OCSP request to a response.
 399  */
 400
 401 int OCSP_copy_nonce(OCSP_BASICRESP *resp, OCSP_REQUEST *req)
 402 {
 403     X509_EXTENSION *req_ext;
 404     int req_idx;
 405     /* Check for nonce in request */
 406     req_idx = OCSP_REQUEST_get_ext_by_NID(req, NID_id_pkix_OCSP_Nonce, -1);
 407     /* If no nonce that's OK */
 408     if (req_idx < 0)
 409         return 2;
 410     req_ext = OCSP_REQUEST_get_ext(req, req_idx);
 411     return OCSP_BASICRESP_add_ext(resp, req_ext, -1);
 412 }
 413
 414 X509_EXTENSION *OCSP_crlID_new(char *url, long *n, char *tim)
 415 {
 416     X509_EXTENSION *x = NULL;
 417     OCSP_CRLID *cid = NULL;
 418
 419     if (!(cid = OCSP_CRLID_new()))
 420         goto err;
 421     if (url) {
 422         if (!(cid->crlUrl = ASN1_IA5STRING_new()))
 423             goto err;
 424         if (!(ASN1_STRING_set(cid->crlUrl, url, -1)))
 425             goto err;
 426     }
 427     if (n) {
 428         if (!(cid->crlNum = ASN1_INTEGER_new()))
 429             goto err;
 430         if (!(ASN1_INTEGER_set(cid->crlNum, *n)))
 431             goto err;
 432     }
 433     if (tim) {
 434         if (!(cid->crlTime = ASN1_GENERALIZEDTIME_new()))
 435             goto err;
 436         if (!(ASN1_GENERALIZEDTIME_set_string(cid->crlTime, tim)))
 437             goto err;
 438     }
 439     x = X509V3_EXT_i2d(NID_id_pkix_OCSP_CrlID, 0, cid);
 440  err:
 441     if (cid)
 442         OCSP_CRLID_free(cid);
 443     return x;
 444 }
 445
 446 /*   AcceptableResponses ::= SEQUENCE OF OBJECT IDENTIFIER */
 447 X509_EXTENSION *OCSP_accept_responses_new(char **oids)
 448 {
 449     int nid;
 450     STACK_OF(ASN1_OBJECT) *sk = NULL;
 451     ASN1_OBJECT *o = NULL;
 452     X509_EXTENSION *x = NULL;
 453
 454     if (!(sk = sk_ASN1_OBJECT_new_null()))
 455         goto err;
 456     while (oids && *oids) {
 457         if ((nid = OBJ_txt2nid(*oids)) != NID_undef && (o = OBJ_nid2obj(nid)))
 458             sk_ASN1_OBJECT_push(sk, o);
 459         oids++;
 460     }
 461     x = X509V3_EXT_i2d(NID_id_pkix_OCSP_acceptableResponses, 0, sk);
 462  err:
 463     sk_ASN1_OBJECT_pop_free(sk, ASN1_OBJECT_free);
 464     return x;
 465 }
 466
 467 /*  ArchiveCutoff ::= GeneralizedTime */
 468 X509_EXTENSION *OCSP_archive_cutoff_new(char *tim)
 469 {
 470     X509_EXTENSION *x = NULL;
 471     ASN1_GENERALIZEDTIME *gt = NULL;
 472
 473     if (!(gt = ASN1_GENERALIZEDTIME_new()))
 474         goto err;
 475     if (!(ASN1_GENERALIZEDTIME_set_string(gt, tim)))
 476         goto err;
 477     x = X509V3_EXT_i2d(NID_id_pkix_OCSP_archiveCutoff, 0, gt);
 478  err:
 479     ASN1_GENERALIZEDTIME_free(gt);
 480     return x;
 481 }
 482
 483 /*
 484  * per ACCESS_DESCRIPTION parameter are oids, of which there are currently
 485  * two--NID_ad_ocsp, NID_id_ad_caIssuers--and GeneralName value.  This method
 486  * forces NID_ad_ocsp and uniformResourceLocator [6] IA5String.
 487  */
 488 X509_EXTENSION *OCSP_url_svcloc_new(X509_NAME *issuer, char **urls)
 489 {
 490     X509_EXTENSION *x = NULL;
 491     ASN1_IA5STRING *ia5 = NULL;
 492     OCSP_SERVICELOC *sloc = NULL;
 493     ACCESS_DESCRIPTION *ad = NULL;
 494
 495     if (!(sloc = OCSP_SERVICELOC_new()))
 496         goto err;
 497     if (!(sloc->issuer = X509_NAME_dup(issuer)))
 498         goto err;
 499     if (urls && *urls && !(sloc->locator = sk_ACCESS_DESCRIPTION_new_null()))
 500         goto err;
 501     while (urls && *urls) {
 502         if (!(ad = ACCESS_DESCRIPTION_new()))
 503             goto err;
 504         if (!(ad->method = OBJ_nid2obj(NID_ad_OCSP)))
 505             goto err;
 506         if (!(ad->location = GENERAL_NAME_new()))
 507             goto err;
 508         if (!(ia5 = ASN1_IA5STRING_new()))
 509             goto err;
 510         if (!ASN1_STRING_set((ASN1_STRING *)ia5, *urls, -1))
 511             goto err;
 512         ad->location->type = GEN_URI;
 513         ad->location->d.ia5 = ia5;
 514         if (!sk_ACCESS_DESCRIPTION_push(sloc->locator, ad))
 515             goto err;
 516         urls++;
 517     }
 518     x = X509V3_EXT_i2d(NID_id_pkix_OCSP_serviceLocator, 0, sloc);
 519  err:
 520     if (sloc)
 521         OCSP_SERVICELOC_free(sloc);
 522     return x;
 523 }