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 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())) 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 */ 105 106 int 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 */ 124 125 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 && !(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 */ 149 150 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 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 (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 /* 221 * Return number of OCSP_SINGLERESP reponses present in a basic response. 222 */ 223 224 int OCSP_resp_count(OCSP_BASICRESP *bs) 225 { 226 if (!bs) 227 return -1; 228 return sk_OCSP_SINGLERESP_num(bs->tbsResponseData->responses); 229 } 230 231 /* Extract an OCSP_SINGLERESP response with a given index */ 232 233 OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx) 234 { 235 if (!bs) 236 return NULL; 237 return sk_OCSP_SINGLERESP_value(bs->tbsResponseData->responses, idx); 238 } 239 240 /* Look single response matching a given certificate ID */ 241 242 int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last) 243 { 244 int i; 245 STACK_OF(OCSP_SINGLERESP) *sresp; 246 OCSP_SINGLERESP *single; 247 if (!bs) 248 return -1; 249 if (last < 0) 250 last = 0; 251 else 252 last++; 253 sresp = bs->tbsResponseData->responses; 254 for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++) { 255 single = sk_OCSP_SINGLERESP_value(sresp, i); 256 if (!OCSP_id_cmp(id, single->certId)) 257 return i; 258 } 259 return -1; 260 } 261 262 /* 263 * Extract status information from an OCSP_SINGLERESP structure. Note: the 264 * revtime and reason values are only set if the certificate status is 265 * revoked. Returns numerical value of status. 266 */ 267 268 int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason, 269 ASN1_GENERALIZEDTIME **revtime, 270 ASN1_GENERALIZEDTIME **thisupd, 271 ASN1_GENERALIZEDTIME **nextupd) 272 { 273 int ret; 274 OCSP_CERTSTATUS *cst; 275 if (!single) 276 return -1; 277 cst = single->certStatus; 278 ret = cst->type; 279 if (ret == V_OCSP_CERTSTATUS_REVOKED) { 280 OCSP_REVOKEDINFO *rev = cst->value.revoked; 281 if (revtime) 282 *revtime = rev->revocationTime; 283 if (reason) { 284 if (rev->revocationReason) 285 *reason = ASN1_ENUMERATED_get(rev->revocationReason); 286 else 287 *reason = -1; 288 } 289 } 290 if (thisupd) 291 *thisupd = single->thisUpdate; 292 if (nextupd) 293 *nextupd = single->nextUpdate; 294 return ret; 295 } 296 297 /* 298 * This function combines the previous ones: look up a certificate ID and if 299 * found extract status information. Return 0 is successful. 300 */ 301 302 int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status, 303 int *reason, 304 ASN1_GENERALIZEDTIME **revtime, 305 ASN1_GENERALIZEDTIME **thisupd, 306 ASN1_GENERALIZEDTIME **nextupd) 307 { 308 int i; 309 OCSP_SINGLERESP *single; 310 i = OCSP_resp_find(bs, id, -1); 311 /* Maybe check for multiple responses and give an error? */ 312 if (i < 0) 313 return 0; 314 single = OCSP_resp_get0(bs, i); 315 i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd); 316 if (status) 317 *status = i; 318 return 1; 319 } 320 321 /* 322 * Check validity of thisUpdate and nextUpdate fields. It is possible that 323 * the request will take a few seconds to process and/or the time wont be 324 * totally accurate. Therefore to avoid rejecting otherwise valid time we 325 * allow the times to be within 'nsec' of the current time. Also to avoid 326 * accepting very old responses without a nextUpdate field an optional maxage 327 * parameter specifies the maximum age the thisUpdate field can be. 328 */ 329 330 int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd, 331 ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec) 332 { 333 int ret = 1; 334 time_t t_now, t_tmp; 335 time(&t_now); 336 /* Check thisUpdate is valid and not more than nsec in the future */ 337 if (!ASN1_GENERALIZEDTIME_check(thisupd)) { 338 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_THISUPDATE_FIELD); 339 ret = 0; 340 } else { 341 t_tmp = t_now + nsec; 342 if (X509_cmp_time(thisupd, &t_tmp) > 0) { 343 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_NOT_YET_VALID); 344 ret = 0; 345 } 346 347 /* 348 * If maxsec specified check thisUpdate is not more than maxsec in 349 * the past 350 */ 351 if (maxsec >= 0) { 352 t_tmp = t_now - maxsec; 353 if (X509_cmp_time(thisupd, &t_tmp) < 0) { 354 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_TOO_OLD); 355 ret = 0; 356 } 357 } 358 } 359 360 if (!nextupd) 361 return ret; 362 363 /* Check nextUpdate is valid and not more than nsec in the past */ 364 if (!ASN1_GENERALIZEDTIME_check(nextupd)) { 365 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_NEXTUPDATE_FIELD); 366 ret = 0; 367 } else { 368 t_tmp = t_now - nsec; 369 if (X509_cmp_time(nextupd, &t_tmp) < 0) { 370 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_EXPIRED); 371 ret = 0; 372 } 373 } 374 375 /* Also don't allow nextUpdate to precede thisUpdate */ 376 if (ASN1_STRING_cmp(nextupd, thisupd) < 0) { 377 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, 378 OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE); 379 ret = 0; 380 } 381 382 return ret; 383 } 384