crypto/ocsp/ocsp_cl.c

   1 /*
   2  * Written by Tom Titchener <Tom_Titchener@groove.net> for the OpenSSL
   3  * project.
   4  */
   5
   6 /*
   7  * History: This file was transfered to Richard Levitte from CertCo by Kathy
   8  * Weinhold in mid-spring 2000 to be included in OpenSSL or released as a
   9  * patch kit.
  10  */
  11
  12 /* ====================================================================
  13  * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.
  14  *
  15  * Redistribution and use in source and binary forms, with or without
  16  * modification, are permitted provided that the following conditions
  17  * are met:
  18  *
  19  * 1. Redistributions of source code must retain the above copyright
  20  *    notice, this list of conditions and the following disclaimer.
  21  *
  22  * 2. Redistributions in binary form must reproduce the above copyright
  23  *    notice, this list of conditions and the following disclaimer in
  24  *    the documentation and/or other materials provided with the
  25  *    distribution.
  26  *
  27  * 3. All advertising materials mentioning features or use of this
  28  *    software must display the following acknowledgment:
  29  *    "This product includes software developed by the OpenSSL Project
  30  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  31  *
  32  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  33  *    endorse or promote products derived from this software without
  34  *    prior written permission. For written permission, please contact
  35  *    openssl-core@openssl.org.
  36  *
  37  * 5. Products derived from this software may not be called "OpenSSL"
  38  *    nor may "OpenSSL" appear in their names without prior written
  39  *    permission of the OpenSSL Project.
  40  *
  41  * 6. Redistributions of any form whatsoever must retain the following
  42  *    acknowledgment:
  43  *    "This product includes software developed by the OpenSSL Project
  44  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  45  *
  46  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  47  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  48  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  49  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  50  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  51  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  52  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  53  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  54  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  55  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  56  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  57  * OF THE POSSIBILITY OF SUCH DAMAGE.
  58  * ====================================================================
  59  *
  60  * This product includes cryptographic software written by Eric Young
  61  * (eay@cryptsoft.com).  This product includes software written by Tim
  62  * Hudson (tjh@cryptsoft.com).
  63  *
  64  */
  65
  66 #include <stdio.h>
  67 #include <time.h>
  68 #include "internal/cryptlib.h"
  69 #include <openssl/objects.h>
  70 #include <openssl/rand.h>
  71 #include <openssl/x509.h>
  72 #include <openssl/pem.h>
  73 #include <openssl/x509v3.h>
  74 #include <openssl/ocsp.h>
  75 #include "ocsp_lcl.h"
  76
  77 /*
  78  * Utility functions related to sending OCSP requests and extracting relevant
  79  * information from the response.
  80  */
  81
  82 /*
  83  * Add an OCSP_CERTID to an OCSP request. Return new OCSP_ONEREQ pointer:
  84  * useful if we want to add extensions.
  85  */
  86
  87 OCSP_ONEREQ *OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid)
  88 {
  89     OCSP_ONEREQ *one = NULL;
  90
  91     if ((one = OCSP_ONEREQ_new()) == NULL)
  92         goto err;
  93     OCSP_CERTID_free(one->reqCert);
  94     one->reqCert = cid;
  95     if (req && !sk_OCSP_ONEREQ_push(req->tbsRequest.requestList, one))
  96         goto err;
  97     return one;
  98  err:
  99     OCSP_ONEREQ_free(one);
 100     return NULL;
 101 }
 102
 103 /* Set requestorName from an X509_NAME structure */
 104
 105 int OCSP_request_set1_name(OCSP_REQUEST *req, X509_NAME *nm)
 106 {
 107     GENERAL_NAME *gen;
 108
 109     gen = GENERAL_NAME_new();
 110     if (gen == NULL)
 111         return 0;
 112     if (!X509_NAME_set(&gen->d.directoryName, nm)) {
 113         GENERAL_NAME_free(gen);
 114         return 0;
 115     }
 116     gen->type = GEN_DIRNAME;
 117     GENERAL_NAME_free(req->tbsRequest.requestorName);
 118     req->tbsRequest.requestorName = gen;
 119     return 1;
 120 }
 121
 122 /* Add a certificate to an OCSP request */
 123
 124 int OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert)
 125 {
 126     OCSP_SIGNATURE *sig;
 127     if (req->optionalSignature == NULL)
 128         req->optionalSignature = OCSP_SIGNATURE_new();
 129     sig = req->optionalSignature;
 130     if (sig == NULL)
 131         return 0;
 132     if (cert == NULL)
 133         return 1;
 134     if (sig->certs == NULL
 135         && (sig->certs = sk_X509_new_null()) == NULL)
 136         return 0;
 137
 138     if (!sk_X509_push(sig->certs, cert))
 139         return 0;
 140     X509_up_ref(cert);
 141     return 1;
 142 }
 143
 144 /*
 145  * Sign an OCSP request set the requestorName to the subjec name of an
 146  * optional signers certificate and include one or more optional certificates
 147  * in the request. Behaves like PKCS7_sign().
 148  */
 149
 150 int OCSP_request_sign(OCSP_REQUEST *req,
 151                       X509 *signer,
 152                       EVP_PKEY *key,
 153                       const EVP_MD *dgst,
 154                       STACK_OF(X509) *certs, unsigned long flags)
 155 {
 156     int i;
 157     X509 *x;
 158
 159     if (!OCSP_request_set1_name(req, X509_get_subject_name(signer)))
 160         goto err;
 161
 162     if ((req->optionalSignature = OCSP_SIGNATURE_new()) == NULL)
 163         goto err;
 164     if (key) {
 165         if (!X509_check_private_key(signer, key)) {
 166             OCSPerr(OCSP_F_OCSP_REQUEST_SIGN,
 167                     OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 168             goto err;
 169         }
 170         if (!OCSP_REQUEST_sign(req, key, dgst))
 171             goto err;
 172     }
 173
 174     if (!(flags & OCSP_NOCERTS)) {
 175         if (!OCSP_request_add1_cert(req, signer))
 176             goto err;
 177         for (i = 0; i < sk_X509_num(certs); i++) {
 178             x = sk_X509_value(certs, i);
 179             if (!OCSP_request_add1_cert(req, x))
 180                 goto err;
 181         }
 182     }
 183
 184     return 1;
 185  err:
 186     OCSP_SIGNATURE_free(req->optionalSignature);
 187     req->optionalSignature = NULL;
 188     return 0;
 189 }
 190
 191 /* Get response status */
 192
 193 int OCSP_response_status(OCSP_RESPONSE *resp)
 194 {
 195     return ASN1_ENUMERATED_get(resp->responseStatus);
 196 }
 197
 198 /*
 199  * Extract basic response from OCSP_RESPONSE or NULL if no basic response
 200  * present.
 201  */
 202
 203 OCSP_BASICRESP *OCSP_response_get1_basic(OCSP_RESPONSE *resp)
 204 {
 205     OCSP_RESPBYTES *rb;
 206     rb = resp->responseBytes;
 207     if (!rb) {
 208         OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NO_RESPONSE_DATA);
 209         return NULL;
 210     }
 211     if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic) {
 212         OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NOT_BASIC_RESPONSE);
 213         return NULL;
 214     }
 215
 216     return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP));
 217 }
 218
 219 ASN1_OCTET_STRING *OCSP_resp_get0_signature(OCSP_BASICRESP *bs)
 220 {
 221     return bs->signature;
 222 }
 223
 224 /*
 225  * Return number of OCSP_SINGLERESP reponses present in a basic response.
 226  */
 227
 228 int OCSP_resp_count(OCSP_BASICRESP *bs)
 229 {
 230     if (!bs)
 231         return -1;
 232     return sk_OCSP_SINGLERESP_num(bs->tbsResponseData.responses);
 233 }
 234
 235 /* Extract an OCSP_SINGLERESP response with a given index */
 236
 237 OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx)
 238 {
 239     if (!bs)
 240         return NULL;
 241     return sk_OCSP_SINGLERESP_value(bs->tbsResponseData.responses, idx);
 242 }
 243
 244 ASN1_GENERALIZEDTIME *OCSP_resp_get0_produced_at(OCSP_BASICRESP* bs)
 245 {
 246     if (!bs)
 247         return NULL;
 248     return bs->tbsResponseData.producedAt;
 249 }
 250
 251 /* Look single response matching a given certificate ID */
 252
 253 int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last)
 254 {
 255     int i;
 256     STACK_OF(OCSP_SINGLERESP) *sresp;
 257     OCSP_SINGLERESP *single;
 258     if (!bs)
 259         return -1;
 260     if (last < 0)
 261         last = 0;
 262     else
 263         last++;
 264     sresp = bs->tbsResponseData.responses;
 265     for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++) {
 266         single = sk_OCSP_SINGLERESP_value(sresp, i);
 267         if (!OCSP_id_cmp(id, single->certId))
 268             return i;
 269     }
 270     return -1;
 271 }
 272
 273 /*
 274  * Extract status information from an OCSP_SINGLERESP structure. Note: the
 275  * revtime and reason values are only set if the certificate status is
 276  * revoked. Returns numerical value of status.
 277  */
 278
 279 int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason,
 280                             ASN1_GENERALIZEDTIME **revtime,
 281                             ASN1_GENERALIZEDTIME **thisupd,
 282                             ASN1_GENERALIZEDTIME **nextupd)
 283 {
 284     int ret;
 285     OCSP_CERTSTATUS *cst;
 286     if (!single)
 287         return -1;
 288     cst = single->certStatus;
 289     ret = cst->type;
 290     if (ret == V_OCSP_CERTSTATUS_REVOKED) {
 291         OCSP_REVOKEDINFO *rev = cst->value.revoked;
 292         if (revtime)
 293             *revtime = rev->revocationTime;
 294         if (reason) {
 295             if (rev->revocationReason)
 296                 *reason = ASN1_ENUMERATED_get(rev->revocationReason);
 297             else
 298                 *reason = -1;
 299         }
 300     }
 301     if (thisupd)
 302         *thisupd = single->thisUpdate;
 303     if (nextupd)
 304         *nextupd = single->nextUpdate;
 305     return ret;
 306 }
 307
 308 /*
 309  * This function combines the previous ones: look up a certificate ID and if
 310  * found extract status information. Return 0 is successful.
 311  */
 312
 313 int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status,
 314                           int *reason,
 315                           ASN1_GENERALIZEDTIME **revtime,
 316                           ASN1_GENERALIZEDTIME **thisupd,
 317                           ASN1_GENERALIZEDTIME **nextupd)
 318 {
 319     int i;
 320     OCSP_SINGLERESP *single;
 321     i = OCSP_resp_find(bs, id, -1);
 322     /* Maybe check for multiple responses and give an error? */
 323     if (i < 0)
 324         return 0;
 325     single = OCSP_resp_get0(bs, i);
 326     i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd);
 327     if (status)
 328         *status = i;
 329     return 1;
 330 }
 331
 332 /*
 333  * Check validity of thisUpdate and nextUpdate fields. It is possible that
 334  * the request will take a few seconds to process and/or the time wont be
 335  * totally accurate. Therefore to avoid rejecting otherwise valid time we
 336  * allow the times to be within 'nsec' of the current time. Also to avoid
 337  * accepting very old responses without a nextUpdate field an optional maxage
 338  * parameter specifies the maximum age the thisUpdate field can be.
 339  */
 340
 341 int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd,
 342                         ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec)
 343 {
 344     int ret = 1;
 345     time_t t_now, t_tmp;
 346     time(&t_now);
 347     /* Check thisUpdate is valid and not more than nsec in the future */
 348     if (!ASN1_GENERALIZEDTIME_check(thisupd)) {
 349         OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_THISUPDATE_FIELD);
 350         ret = 0;
 351     } else {
 352         t_tmp = t_now + nsec;
 353         if (X509_cmp_time(thisupd, &t_tmp) > 0) {
 354             OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_NOT_YET_VALID);
 355             ret = 0;
 356         }
 357
 358         /*
 359          * If maxsec specified check thisUpdate is not more than maxsec in
 360          * the past
 361          */
 362         if (maxsec >= 0) {
 363             t_tmp = t_now - maxsec;
 364             if (X509_cmp_time(thisupd, &t_tmp) < 0) {
 365                 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_TOO_OLD);
 366                 ret = 0;
 367             }
 368         }
 369     }
 370
 371     if (!nextupd)
 372         return ret;
 373
 374     /* Check nextUpdate is valid and not more than nsec in the past */
 375     if (!ASN1_GENERALIZEDTIME_check(nextupd)) {
 376         OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_NEXTUPDATE_FIELD);
 377         ret = 0;
 378     } else {
 379         t_tmp = t_now - nsec;
 380         if (X509_cmp_time(nextupd, &t_tmp) < 0) {
 381             OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_EXPIRED);
 382             ret = 0;
 383         }
 384     }
 385
 386     /* Also don't allow nextUpdate to precede thisUpdate */
 387     if (ASN1_STRING_cmp(nextupd, thisupd) < 0) {
 388         OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY,
 389                 OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE);
 390         ret = 0;
 391     }
 392
 393     return ret;
 394 }
 395
 396 OCSP_CERTID *OCSP_SINGLERESP_get0_id(OCSP_SINGLERESP *single)
 397 {
 398     return single->certId;
 399 }