ocsp_cl.c revision 296465
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 <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 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 87OCSP_ONEREQ *OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid) 88{ 89 OCSP_ONEREQ *one = NULL; 90 91 if (!(one = OCSP_ONEREQ_new())) 92 goto err; 93 if (one->reqCert) 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 106int OCSP_request_set1_name(OCSP_REQUEST *req, X509_NAME *nm) 107{ 108 GENERAL_NAME *gen; 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 if (req->tbsRequest->requestorName) 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 125int 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 && !(sig->certs = sk_X509_new_null())) 136 return 0; 137 138 if (!sk_X509_push(sig->certs, cert)) 139 return 0; 140 CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509); 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 150int 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 OCSP_SIGNATURE *sig; 158 X509 *x; 159 160 if (!OCSP_request_set1_name(req, X509_get_subject_name(signer))) 161 goto err; 162 163 if (!(req->optionalSignature = sig = OCSP_SIGNATURE_new())) 164 goto err; 165 if (!dgst) 166 dgst = EVP_sha1(); 167 if (key) { 168 if (!X509_check_private_key(signer, key)) { 169 OCSPerr(OCSP_F_OCSP_REQUEST_SIGN, 170 OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 171 goto err; 172 } 173 if (!OCSP_REQUEST_sign(req, key, dgst)) 174 goto err; 175 } 176 177 if (!(flags & OCSP_NOCERTS)) { 178 if (!OCSP_request_add1_cert(req, signer)) 179 goto err; 180 for (i = 0; i < sk_X509_num(certs); i++) { 181 x = sk_X509_value(certs, i); 182 if (!OCSP_request_add1_cert(req, x)) 183 goto err; 184 } 185 } 186 187 return 1; 188 err: 189 OCSP_SIGNATURE_free(req->optionalSignature); 190 req->optionalSignature = NULL; 191 return 0; 192} 193 194/* Get response status */ 195 196int OCSP_response_status(OCSP_RESPONSE *resp) 197{ 198 return ASN1_ENUMERATED_get(resp->responseStatus); 199} 200 201/* 202 * Extract basic response from OCSP_RESPONSE or NULL if no basic response 203 * present. 204 */ 205 206OCSP_BASICRESP *OCSP_response_get1_basic(OCSP_RESPONSE *resp) 207{ 208 OCSP_RESPBYTES *rb; 209 rb = resp->responseBytes; 210 if (!rb) { 211 OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NO_RESPONSE_DATA); 212 return NULL; 213 } 214 if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic) { 215 OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NOT_BASIC_RESPONSE); 216 return NULL; 217 } 218 219 return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP)); 220} 221 222/* 223 * Return number of OCSP_SINGLERESP reponses present in a basic response. 224 */ 225 226int OCSP_resp_count(OCSP_BASICRESP *bs) 227{ 228 if (!bs) 229 return -1; 230 return sk_OCSP_SINGLERESP_num(bs->tbsResponseData->responses); 231} 232 233/* Extract an OCSP_SINGLERESP response with a given index */ 234 235OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx) 236{ 237 if (!bs) 238 return NULL; 239 return sk_OCSP_SINGLERESP_value(bs->tbsResponseData->responses, idx); 240} 241 242/* Look single response matching a given certificate ID */ 243 244int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last) 245{ 246 int i; 247 STACK_OF(OCSP_SINGLERESP) *sresp; 248 OCSP_SINGLERESP *single; 249 if (!bs) 250 return -1; 251 if (last < 0) 252 last = 0; 253 else 254 last++; 255 sresp = bs->tbsResponseData->responses; 256 for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++) { 257 single = sk_OCSP_SINGLERESP_value(sresp, i); 258 if (!OCSP_id_cmp(id, single->certId)) 259 return i; 260 } 261 return -1; 262} 263 264/* 265 * Extract status information from an OCSP_SINGLERESP structure. Note: the 266 * revtime and reason values are only set if the certificate status is 267 * revoked. Returns numerical value of status. 268 */ 269 270int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason, 271 ASN1_GENERALIZEDTIME **revtime, 272 ASN1_GENERALIZEDTIME **thisupd, 273 ASN1_GENERALIZEDTIME **nextupd) 274{ 275 int ret; 276 OCSP_CERTSTATUS *cst; 277 if (!single) 278 return -1; 279 cst = single->certStatus; 280 ret = cst->type; 281 if (ret == V_OCSP_CERTSTATUS_REVOKED) { 282 OCSP_REVOKEDINFO *rev = cst->value.revoked; 283 if (revtime) 284 *revtime = rev->revocationTime; 285 if (reason) { 286 if (rev->revocationReason) 287 *reason = ASN1_ENUMERATED_get(rev->revocationReason); 288 else 289 *reason = -1; 290 } 291 } 292 if (thisupd) 293 *thisupd = single->thisUpdate; 294 if (nextupd) 295 *nextupd = single->nextUpdate; 296 return ret; 297} 298 299/* 300 * This function combines the previous ones: look up a certificate ID and if 301 * found extract status information. Return 0 is successful. 302 */ 303 304int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status, 305 int *reason, 306 ASN1_GENERALIZEDTIME **revtime, 307 ASN1_GENERALIZEDTIME **thisupd, 308 ASN1_GENERALIZEDTIME **nextupd) 309{ 310 int i; 311 OCSP_SINGLERESP *single; 312 i = OCSP_resp_find(bs, id, -1); 313 /* Maybe check for multiple responses and give an error? */ 314 if (i < 0) 315 return 0; 316 single = OCSP_resp_get0(bs, i); 317 i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd); 318 if (status) 319 *status = i; 320 return 1; 321} 322 323/* 324 * Check validity of thisUpdate and nextUpdate fields. It is possible that 325 * the request will take a few seconds to process and/or the time wont be 326 * totally accurate. Therefore to avoid rejecting otherwise valid time we 327 * allow the times to be within 'nsec' of the current time. Also to avoid 328 * accepting very old responses without a nextUpdate field an optional maxage 329 * parameter specifies the maximum age the thisUpdate field can be. 330 */ 331 332int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd, 333 ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec) 334{ 335 int ret = 1; 336 time_t t_now, t_tmp; 337 time(&t_now); 338 /* Check thisUpdate is valid and not more than nsec in the future */ 339 if (!ASN1_GENERALIZEDTIME_check(thisupd)) { 340 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_THISUPDATE_FIELD); 341 ret = 0; 342 } else { 343 t_tmp = t_now + nsec; 344 if (X509_cmp_time(thisupd, &t_tmp) > 0) { 345 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_NOT_YET_VALID); 346 ret = 0; 347 } 348 349 /* 350 * If maxsec specified check thisUpdate is not more than maxsec in 351 * the past 352 */ 353 if (maxsec >= 0) { 354 t_tmp = t_now - maxsec; 355 if (X509_cmp_time(thisupd, &t_tmp) < 0) { 356 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_TOO_OLD); 357 ret = 0; 358 } 359 } 360 } 361 362 if (!nextupd) 363 return ret; 364 365 /* Check nextUpdate is valid and not more than nsec in the past */ 366 if (!ASN1_GENERALIZEDTIME_check(nextupd)) { 367 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_NEXTUPDATE_FIELD); 368 ret = 0; 369 } else { 370 t_tmp = t_now - nsec; 371 if (X509_cmp_time(nextupd, &t_tmp) < 0) { 372 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_EXPIRED); 373 ret = 0; 374 } 375 } 376 377 /* Also don't allow nextUpdate to precede thisUpdate */ 378 if (ASN1_STRING_cmp(nextupd, thisupd) < 0) { 379 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, 380 OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE); 381 ret = 0; 382 } 383 384 return ret; 385} 386