crypto/ocsp/ocsp_cl.c

   1 /* ocsp_cl.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 <time.h>
  69 #include "internal/cryptlib.h"
  70 #include <openssl/objects.h>
  71 #include <openssl/rand.h>
  72 #include <openssl/x509.h>
  73 #include <openssl/pem.h>
  74 #include <openssl/x509v3.h>
  75 #include <openssl/ocsp.h>
  76 #include "ocsp_lcl.h"
  77
  78 /*
  79  * Utility functions related to sending OCSP requests and extracting relevant
  80  * information from the response.
  81  */
  82
  83 /*
  84  * Add an OCSP_CERTID to an OCSP request. Return new OCSP_ONEREQ pointer:
  85  * useful if we want to add extensions.
  86  */
  87
  88 OCSP_ONEREQ *OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid)
  89 {
  90     OCSP_ONEREQ *one = NULL;
  91
  92     if ((one = OCSP_ONEREQ_new()) == NULL)
  93         goto err;
  94     OCSP_CERTID_free(one->reqCert);
  95     one->reqCert = cid;
  96     if (req && !sk_OCSP_ONEREQ_push(req->tbsRequest->requestList, one))
  97         goto err;
  98     return one;
  99  err:
 100     OCSP_ONEREQ_free(one);
 101     return NULL;
 102 }
 103
 104 /* Set requestorName from an X509_NAME structure */
 105
 106 int OCSP_request_set1_name(OCSP_REQUEST *req, X509_NAME *nm)
 107 {
 108     GENERAL_NAME *gen;
 109
 110     gen = GENERAL_NAME_new();
 111     if (gen == NULL)
 112         return 0;
 113     if (!X509_NAME_set(&gen->d.directoryName, nm)) {
 114         GENERAL_NAME_free(gen);
 115         return 0;
 116     }
 117     gen->type = GEN_DIRNAME;
 118     GENERAL_NAME_free(req->tbsRequest->requestorName);
 119     req->tbsRequest->requestorName = gen;
 120     return 1;
 121 }
 122
 123 /* Add a certificate to an OCSP request */
 124
 125 int OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert)
 126 {
 127     OCSP_SIGNATURE *sig;
 128     if (!req->optionalSignature)
 129         req->optionalSignature = OCSP_SIGNATURE_new();
 130     sig = req->optionalSignature;
 131     if (!sig)
 132         return 0;
 133     if (!cert)
 134         return 1;
 135     if (sig->certs == NULL
 136         && (sig->certs = sk_X509_new_null()) == NULL)
 137         return 0;
 138
 139     if (!sk_X509_push(sig->certs, cert))
 140         return 0;
 141     X509_up_ref(cert);
 142     return 1;
 143 }
 144
 145 /*
 146  * Sign an OCSP request set the requestorName to the subjec name of an
 147  * optional signers certificate and include one or more optional certificates
 148  * in the request. Behaves like PKCS7_sign().
 149  */
 150
 151 int OCSP_request_sign(OCSP_REQUEST *req,
 152                       X509 *signer,
 153                       EVP_PKEY *key,
 154                       const EVP_MD *dgst,
 155                       STACK_OF(X509) *certs, unsigned long flags)
 156 {
 157     int i;
 158     X509 *x;
 159
 160     if (!OCSP_request_set1_name(req, X509_get_subject_name(signer)))
 161         goto err;
 162
 163     if ((req->optionalSignature = OCSP_SIGNATURE_new()) == NULL)
 164         goto err;
 165     if (key) {
 166         if (!X509_check_private_key(signer, key)) {
 167             OCSPerr(OCSP_F_OCSP_REQUEST_SIGN,
 168                     OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 169             goto err;
 170         }
 171         if (!OCSP_REQUEST_sign(req, key, dgst))
 172             goto err;
 173     }
 174
 175     if (!(flags & OCSP_NOCERTS)) {
 176         if (!OCSP_request_add1_cert(req, signer))
 177             goto err;
 178         for (i = 0; i < sk_X509_num(certs); i++) {
 179             x = sk_X509_value(certs, i);
 180             if (!OCSP_request_add1_cert(req, x))
 181                 goto err;
 182         }
 183     }
 184
 185     return 1;
 186  err:
 187     OCSP_SIGNATURE_free(req->optionalSignature);
 188     req->optionalSignature = NULL;
 189     return 0;
 190 }
 191
 192 /* Get response status */
 193
 194 int OCSP_response_status(OCSP_RESPONSE *resp)
 195 {
 196     return ASN1_ENUMERATED_get(resp->responseStatus);
 197 }
 198
 199 /*
 200  * Extract basic response from OCSP_RESPONSE or NULL if no basic response
 201  * present.
 202  */
 203
 204 OCSP_BASICRESP *OCSP_response_get1_basic(OCSP_RESPONSE *resp)
 205 {
 206     OCSP_RESPBYTES *rb;
 207     rb = resp->responseBytes;
 208     if (!rb) {
 209         OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NO_RESPONSE_DATA);
 210         return NULL;
 211     }
 212     if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic) {
 213         OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NOT_BASIC_RESPONSE);
 214         return NULL;
 215     }
 216
 217     return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP));
 218 }
 219
 220 ASN1_OCTET_STRING *OCSP_resp_get0_signature(OCSP_BASICRESP *bs)
 221 {
 222     return bs->signature;
 223 }
 224
 225 /*
 226  * Return number of OCSP_SINGLERESP reponses present in a basic response.
 227  */
 228
 229 int OCSP_resp_count(OCSP_BASICRESP *bs)
 230 {
 231     if (!bs)
 232         return -1;
 233     return sk_OCSP_SINGLERESP_num(bs->tbsResponseData->responses);
 234 }
 235
 236 /* Extract an OCSP_SINGLERESP response with a given index */
 237
 238 OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx)
 239 {
 240     if (!bs)
 241         return NULL;
 242     return sk_OCSP_SINGLERESP_value(bs->tbsResponseData->responses, idx);
 243 }
 244
 245 /* Look single response matching a given certificate ID */
 246
 247 int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last)
 248 {
 249     int i;
 250     STACK_OF(OCSP_SINGLERESP) *sresp;
 251     OCSP_SINGLERESP *single;
 252     if (!bs)
 253         return -1;
 254     if (last < 0)
 255         last = 0;
 256     else
 257         last++;
 258     sresp = bs->tbsResponseData->responses;
 259     for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++) {
 260         single = sk_OCSP_SINGLERESP_value(sresp, i);
 261         if (!OCSP_id_cmp(id, single->certId))
 262             return i;
 263     }
 264     return -1;
 265 }
 266
 267 /*
 268  * Extract status information from an OCSP_SINGLERESP structure. Note: the
 269  * revtime and reason values are only set if the certificate status is
 270  * revoked. Returns numerical value of status.
 271  */
 272
 273 int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason,
 274                             ASN1_GENERALIZEDTIME **revtime,
 275                             ASN1_GENERALIZEDTIME **thisupd,
 276                             ASN1_GENERALIZEDTIME **nextupd)
 277 {
 278     int ret;
 279     OCSP_CERTSTATUS *cst;
 280     if (!single)
 281         return -1;
 282     cst = single->certStatus;
 283     ret = cst->type;
 284     if (ret == V_OCSP_CERTSTATUS_REVOKED) {
 285         OCSP_REVOKEDINFO *rev = cst->value.revoked;
 286         if (revtime)
 287             *revtime = rev->revocationTime;
 288         if (reason) {
 289             if (rev->revocationReason)
 290                 *reason = ASN1_ENUMERATED_get(rev->revocationReason);
 291             else
 292                 *reason = -1;
 293         }
 294     }
 295     if (thisupd)
 296         *thisupd = single->thisUpdate;
 297     if (nextupd)
 298         *nextupd = single->nextUpdate;
 299     return ret;
 300 }
 301
 302 /*
 303  * This function combines the previous ones: look up a certificate ID and if
 304  * found extract status information. Return 0 is successful.
 305  */
 306
 307 int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status,
 308                           int *reason,
 309                           ASN1_GENERALIZEDTIME **revtime,
 310                           ASN1_GENERALIZEDTIME **thisupd,
 311                           ASN1_GENERALIZEDTIME **nextupd)
 312 {
 313     int i;
 314     OCSP_SINGLERESP *single;
 315     i = OCSP_resp_find(bs, id, -1);
 316     /* Maybe check for multiple responses and give an error? */
 317     if (i < 0)
 318         return 0;
 319     single = OCSP_resp_get0(bs, i);
 320     i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd);
 321     if (status)
 322         *status = i;
 323     return 1;
 324 }
 325
 326 /*
 327  * Check validity of thisUpdate and nextUpdate fields. It is possible that
 328  * the request will take a few seconds to process and/or the time wont be
 329  * totally accurate. Therefore to avoid rejecting otherwise valid time we
 330  * allow the times to be within 'nsec' of the current time. Also to avoid
 331  * accepting very old responses without a nextUpdate field an optional maxage
 332  * parameter specifies the maximum age the thisUpdate field can be.
 333  */
 334
 335 int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd,
 336                         ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec)
 337 {
 338     int ret = 1;
 339     time_t t_now, t_tmp;
 340     time(&t_now);
 341     /* Check thisUpdate is valid and not more than nsec in the future */
 342     if (!ASN1_GENERALIZEDTIME_check(thisupd)) {
 343         OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_THISUPDATE_FIELD);
 344         ret = 0;
 345     } else {
 346         t_tmp = t_now + nsec;
 347         if (X509_cmp_time(thisupd, &t_tmp) > 0) {
 348             OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_NOT_YET_VALID);
 349             ret = 0;
 350         }
 351
 352         /*
 353          * If maxsec specified check thisUpdate is not more than maxsec in
 354          * the past
 355          */
 356         if (maxsec >= 0) {
 357             t_tmp = t_now - maxsec;
 358             if (X509_cmp_time(thisupd, &t_tmp) < 0) {
 359                 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_TOO_OLD);
 360                 ret = 0;
 361             }
 362         }
 363     }
 364
 365     if (!nextupd)
 366         return ret;
 367
 368     /* Check nextUpdate is valid and not more than nsec in the past */
 369     if (!ASN1_GENERALIZEDTIME_check(nextupd)) {
 370         OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_NEXTUPDATE_FIELD);
 371         ret = 0;
 372     } else {
 373         t_tmp = t_now - nsec;
 374         if (X509_cmp_time(nextupd, &t_tmp) < 0) {
 375             OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_EXPIRED);
 376             ret = 0;
 377         }
 378     }
 379
 380     /* Also don't allow nextUpdate to precede thisUpdate */
 381     if (ASN1_STRING_cmp(nextupd, thisupd) < 0) {
 382         OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY,
 383                 OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE);
 384         ret = 0;
 385     }
 386
 387     return ret;
 388 }