crypto/ocsp/ocsp_cl.c

   1 /* ocsp_cl.c */
   2 /* Written by Tom Titchener <Tom_Titchener@groove.net> for the OpenSSL
   3  * project. */
   4
   5 /* History:
   6    This file was transfered to Richard Levitte from CertCo by Kathy
   7    Weinhold in mid-spring 2000 to be included in OpenSSL or released
   8    as a patch kit. */
   9
  10 /* ====================================================================
  11  * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  *
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  *
  20  * 2. Redistributions in binary form must reproduce the above copyright
  21  *    notice, this list of conditions and the following disclaimer in
  22  *    the documentation and/or other materials provided with the
  23  *    distribution.
  24  *
  25  * 3. All advertising materials mentioning features or use of this
  26  *    software must display the following acknowledgment:
  27  *    "This product includes software developed by the OpenSSL Project
  28  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  29  *
  30  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  31  *    endorse or promote products derived from this software without
  32  *    prior written permission. For written permission, please contact
  33  *    openssl-core@openssl.org.
  34  *
  35  * 5. Products derived from this software may not be called "OpenSSL"
  36  *    nor may "OpenSSL" appear in their names without prior written
  37  *    permission of the OpenSSL Project.
  38  *
  39  * 6. Redistributions of any form whatsoever must retain the following
  40  *    acknowledgment:
  41  *    "This product includes software developed by the OpenSSL Project
  42  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  45  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  47  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  48  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  49  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  50  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  51  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  53  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  54  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  55  * OF THE POSSIBILITY OF SUCH DAMAGE.
  56  * ====================================================================
  57  *
  58  * This product includes cryptographic software written by Eric Young
  59  * (eay@cryptsoft.com).  This product includes software written by Tim
  60  * Hudson (tjh@cryptsoft.com).
  61  *
  62  */
  63
  64 #include <stdio.h>
  65 #include <time.h>
  66 #include <cryptlib.h>
  67 #include <openssl/objects.h>
  68 #include <openssl/rand.h>
  69 #include <openssl/x509.h>
  70 #include <openssl/pem.h>
  71 #include <openssl/x509v3.h>
  72 #include <openssl/ocsp.h>
  73
  74 /* Utility functions related to sending OCSP requests and extracting
  75  * relevant information from the response.
  76  */
  77
  78 /* Add an OCSP_CERTID to an OCSP request. Return new OCSP_ONEREQ
  79  * pointer: useful if we want to add extensions.
  80  */
  81
  82 OCSP_ONEREQ *OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid)
  83         {
  84         OCSP_ONEREQ *one = NULL;
  85
  86         if (!(one = OCSP_ONEREQ_new())) goto err;
  87         if (one->reqCert) OCSP_CERTID_free(one->reqCert);
  88         one->reqCert = cid;
  89         if (req &&
  90                 !sk_OCSP_ONEREQ_push(req->tbsRequest->requestList, one))
  91                                 goto err;
  92         return one;
  93 err:
  94         OCSP_ONEREQ_free(one);
  95         return NULL;
  96         }
  97
  98 /* Set requestorName from an X509_NAME structure */
  99
 100 int OCSP_request_set1_name(OCSP_REQUEST *req, X509_NAME *nm)
 101         {
 102         GENERAL_NAME *gen;
 103         gen = GENERAL_NAME_new();
 104         if (gen == NULL)
 105                 return 0;
 106         if (!X509_NAME_set(&gen->d.directoryName, nm))
 107                 {
 108                 GENERAL_NAME_free(gen);
 109                 return 0;
 110                 }
 111         gen->type = GEN_DIRNAME;
 112         if (req->tbsRequest->requestorName)
 113                 GENERAL_NAME_free(req->tbsRequest->requestorName);
 114         req->tbsRequest->requestorName = gen;
 115         return 1;
 116         }
 117
 118
 119 /* Add a certificate to an OCSP request */
 120
 121 int OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert)
 122         {
 123         OCSP_SIGNATURE *sig;
 124         if (!req->optionalSignature)
 125                 req->optionalSignature = OCSP_SIGNATURE_new();
 126         sig = req->optionalSignature;
 127         if (!sig) return 0;
 128         if (!cert) return 1;
 129         if (!sig->certs && !(sig->certs = sk_X509_new_null()))
 130                 return 0;
 131
 132         if(!sk_X509_push(sig->certs, cert)) return 0;
 133         CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509);
 134         return 1;
 135         }
 136
 137 /* Sign an OCSP request set the requestorName to the subjec
 138  * name of an optional signers certificate and include one
 139  * or more optional certificates in the request. Behaves
 140  * like PKCS7_sign().
 141  */
 142
 143 int OCSP_request_sign(OCSP_REQUEST   *req,
 144                       X509           *signer,
 145                       EVP_PKEY       *key,
 146                       const EVP_MD   *dgst,
 147                       STACK_OF(X509) *certs,
 148                       unsigned long flags)
 149         {
 150         int i;
 151         OCSP_SIGNATURE *sig;
 152         X509 *x;
 153
 154         if (!OCSP_request_set1_name(req, X509_get_subject_name(signer)))
 155                         goto err;
 156
 157         if (!(req->optionalSignature = sig = OCSP_SIGNATURE_new())) goto err;
 158         if (!dgst) dgst = EVP_sha1();
 159         if (key)
 160                 {
 161                 if (!X509_check_private_key(signer, key))
 162                         {
 163                         OCSPerr(OCSP_F_OCSP_REQUEST_SIGN, OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 164                         goto err;
 165                         }
 166                 if (!OCSP_REQUEST_sign(req, key, dgst)) goto err;
 167                 }
 168
 169         if (!(flags & OCSP_NOCERTS))
 170                 {
 171                 if(!OCSP_request_add1_cert(req, signer)) goto err;
 172                 for (i = 0; i < sk_X509_num(certs); i++)
 173                         {
 174                         x = sk_X509_value(certs, i);
 175                         if (!OCSP_request_add1_cert(req, x)) goto err;
 176                         }
 177                 }
 178
 179         return 1;
 180 err:
 181         OCSP_SIGNATURE_free(req->optionalSignature);
 182         req->optionalSignature = NULL;
 183         return 0;
 184         }
 185
 186 /* Get response status */
 187
 188 int OCSP_response_status(OCSP_RESPONSE *resp)
 189         {
 190         return ASN1_ENUMERATED_get(resp->responseStatus);
 191         }
 192
 193 /* Extract basic response from OCSP_RESPONSE or NULL if
 194  * no basic response present.
 195  */
 196
 197
 198 OCSP_BASICRESP *OCSP_response_get1_basic(OCSP_RESPONSE *resp)
 199         {
 200         OCSP_RESPBYTES *rb;
 201         rb = resp->responseBytes;
 202         if (!rb)
 203                 {
 204                 OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NO_RESPONSE_DATA);
 205                 return NULL;
 206                 }
 207         if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic)
 208                 {
 209                 OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NOT_BASIC_RESPONSE);
 210                 return NULL;
 211                 }
 212
 213         return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP));
 214         }
 215
 216 /* Return number of OCSP_SINGLERESP reponses present in
 217  * a basic response.
 218  */
 219
 220 int OCSP_resp_count(OCSP_BASICRESP *bs)
 221         {
 222         if (!bs) return -1;
 223         return sk_OCSP_SINGLERESP_num(bs->tbsResponseData->responses);
 224         }
 225
 226 /* Extract an OCSP_SINGLERESP response with a given index */
 227
 228 OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx)
 229         {
 230         if (!bs) return NULL;
 231         return sk_OCSP_SINGLERESP_value(bs->tbsResponseData->responses, idx);
 232         }
 233
 234 /* Look single response matching a given certificate ID */
 235
 236 int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last)
 237         {
 238         int i;
 239         STACK_OF(OCSP_SINGLERESP) *sresp;
 240         OCSP_SINGLERESP *single;
 241         if (!bs) return -1;
 242         if (last < 0) last = 0;
 243         else last++;
 244         sresp = bs->tbsResponseData->responses;
 245         for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++)
 246                 {
 247                 single = sk_OCSP_SINGLERESP_value(sresp, i);
 248                 if (!OCSP_id_cmp(id, single->certId)) return i;
 249                 }
 250         return -1;
 251         }
 252
 253 /* Extract status information from an OCSP_SINGLERESP structure.
 254  * Note: the revtime and reason values are only set if the
 255  * certificate status is revoked. Returns numerical value of
 256  * status.
 257  */
 258
 259 int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason,
 260                                 ASN1_GENERALIZEDTIME **revtime,
 261                                 ASN1_GENERALIZEDTIME **thisupd,
 262                                 ASN1_GENERALIZEDTIME **nextupd)
 263         {
 264         int ret;
 265         OCSP_CERTSTATUS *cst;
 266         if(!single) return -1;
 267         cst = single->certStatus;
 268         ret = cst->type;
 269         if (ret == V_OCSP_CERTSTATUS_REVOKED)
 270                 {
 271                 OCSP_REVOKEDINFO *rev = cst->value.revoked;
 272                 if (revtime) *revtime = rev->revocationTime;
 273                 if (reason)
 274                         {
 275                         if(rev->revocationReason)
 276                                 *reason = ASN1_ENUMERATED_get(rev->revocationReason);
 277                         else *reason = -1;
 278                         }
 279                 }
 280         if(thisupd) *thisupd = single->thisUpdate;
 281         if(nextupd) *nextupd = single->nextUpdate;
 282         return ret;
 283         }
 284
 285 /* This function combines the previous ones: look up a certificate ID and
 286  * if found extract status information. Return 0 is successful.
 287  */
 288
 289 int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status,
 290                                 int *reason,
 291                                 ASN1_GENERALIZEDTIME **revtime,
 292                                 ASN1_GENERALIZEDTIME **thisupd,
 293                                 ASN1_GENERALIZEDTIME **nextupd)
 294         {
 295         int i;
 296         OCSP_SINGLERESP *single;
 297         i = OCSP_resp_find(bs, id, -1);
 298         /* Maybe check for multiple responses and give an error? */
 299         if(i < 0) return 0;
 300         single = OCSP_resp_get0(bs, i);
 301         i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd);
 302         if(status) *status = i;
 303         return 1;
 304         }
 305
 306 /* Check validity of thisUpdate and nextUpdate fields. It is possible that the request will
 307  * take a few seconds to process and/or the time wont be totally accurate. Therefore to avoid
 308  * rejecting otherwise valid time we allow the times to be within 'nsec' of the current time.
 309  * Also to avoid accepting very old responses without a nextUpdate field an optional maxage
 310  * parameter specifies the maximum age the thisUpdate field can be.
 311  */
 312
 313 int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd, ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec)
 314         {
 315         int ret = 1;
 316         time_t t_now, t_tmp;
 317         time(&t_now);
 318         /* Check thisUpdate is valid and not more than nsec in the future */
 319         if (!ASN1_GENERALIZEDTIME_check(thisupd))
 320                 {
 321                 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_THISUPDATE_FIELD);
 322                 ret = 0;
 323                 }
 324         else
 325                 {
 326                         t_tmp = t_now + nsec;
 327                         if (X509_cmp_time(thisupd, &t_tmp) > 0)
 328                         {
 329                         OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_NOT_YET_VALID);
 330                         ret = 0;
 331                         }
 332
 333                 /* If maxsec specified check thisUpdate is not more than maxsec in the past */
 334                 if (maxsec >= 0)
 335                         {
 336                         t_tmp = t_now - maxsec;
 337                         if (X509_cmp_time(thisupd, &t_tmp) < 0)
 338                                 {
 339                                 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_TOO_OLD);
 340                                 ret = 0;
 341                                 }
 342                         }
 343                 }
 344
 345
 346         if (!nextupd) return ret;
 347
 348         /* Check nextUpdate is valid and not more than nsec in the past */
 349         if (!ASN1_GENERALIZEDTIME_check(nextupd))
 350                 {
 351                 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_NEXTUPDATE_FIELD);
 352                 ret = 0;
 353                 }
 354         else
 355                 {
 356                 t_tmp = t_now - nsec;
 357                 if (X509_cmp_time(nextupd, &t_tmp) < 0)
 358                         {
 359                         OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_EXPIRED);
 360                         ret = 0;
 361                         }
 362                 }
 363
 364         /* Also don't allow nextUpdate to precede thisUpdate */
 365         if (ASN1_STRING_cmp(nextupd, thisupd) < 0)
 366                 {
 367                 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE);
 368                 ret = 0;
 369                 }
 370
 371         return ret;
 372         }