1 /* $OpenBSD: ocsp_cl.c,v 1.10 2016/07/05 03:24:38 beck Exp $ */ 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 67 #include <openssl/err.h> 68 #include <openssl/ocsp.h> 69 #include <openssl/objects.h> 70 #include <openssl/pem.h> 71 #include <openssl/x509.h> 72 #include <openssl/x509v3.h> 73 74 int asn1_time_parse(const char *, size_t, struct tm *, int); 75 int asn1_tm_cmp(struct tm *, struct tm *); 76 77 /* Utility functions related to sending OCSP requests and extracting 78 * relevant information from the response. 79 */ 80 81 /* Add an OCSP_CERTID to an OCSP request. Return new OCSP_ONEREQ 82 * pointer: useful if we want to add extensions. 83 */ 84 OCSP_ONEREQ * 85 OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid) 86 { 87 OCSP_ONEREQ *one = NULL; 88 89 if (!(one = OCSP_ONEREQ_new())) 90 goto err; 91 if (one->reqCert) 92 OCSP_CERTID_free(one->reqCert); 93 one->reqCert = cid; 94 if (req && !sk_OCSP_ONEREQ_push(req->tbsRequest->requestList, one)) 95 goto err; 96 return one; 97 98 err: 99 OCSP_ONEREQ_free(one); 100 return NULL; 101 } 102 103 /* Set requestorName from an X509_NAME structure */ 104 int 105 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 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 int 125 OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert) 126 { 127 OCSP_SIGNATURE *sig; 128 129 if (!req->optionalSignature) 130 req->optionalSignature = OCSP_SIGNATURE_new(); 131 sig = req->optionalSignature; 132 if (!sig) 133 return 0; 134 if (!cert) 135 return 1; 136 if (!sig->certs && !(sig->certs = sk_X509_new_null())) 137 return 0; 138 139 if (!sk_X509_push(sig->certs, cert)) 140 return 0; 141 CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509); 142 return 1; 143 } 144 145 /* Sign an OCSP request set the requestorName to the subjec 146 * name of an optional signers certificate and include one 147 * or more optional certificates in the request. Behaves 148 * like PKCS7_sign(). 149 */ 150 int 151 OCSP_request_sign(OCSP_REQUEST *req, X509 *signer, EVP_PKEY *key, 152 const EVP_MD *dgst, STACK_OF(X509) *certs, unsigned long flags) 153 { 154 int i; 155 OCSP_SIGNATURE *sig; 156 X509 *x; 157 158 if (!OCSP_request_set1_name(req, X509_get_subject_name(signer))) 159 goto err; 160 161 if (!(req->optionalSignature = sig = OCSP_SIGNATURE_new())) 162 goto err; 163 if (key) { 164 if (!X509_check_private_key(signer, key)) { 165 OCSPerr(OCSP_F_OCSP_REQUEST_SIGN, 166 OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 167 goto err; 168 } 169 if (!OCSP_REQUEST_sign(req, key, dgst)) 170 goto err; 171 } 172 173 if (!(flags & OCSP_NOCERTS)) { 174 if (!OCSP_request_add1_cert(req, signer)) 175 goto err; 176 for (i = 0; i < sk_X509_num(certs); i++) { 177 x = sk_X509_value(certs, i); 178 if (!OCSP_request_add1_cert(req, x)) 179 goto err; 180 } 181 } 182 183 return 1; 184 185 err: 186 OCSP_SIGNATURE_free(req->optionalSignature); 187 req->optionalSignature = NULL; 188 return 0; 189 } 190 191 /* Get response status */ 192 int 193 OCSP_response_status(OCSP_RESPONSE *resp) 194 { 195 return ASN1_ENUMERATED_get(resp->responseStatus); 196 } 197 198 /* Extract basic response from OCSP_RESPONSE or NULL if 199 * no basic response present. 200 */ 201 OCSP_BASICRESP * 202 OCSP_response_get1_basic(OCSP_RESPONSE *resp) 203 { 204 OCSP_RESPBYTES *rb; 205 206 rb = resp->responseBytes; 207 if (!rb) { 208 OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, 209 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, 214 OCSP_R_NOT_BASIC_RESPONSE); 215 return NULL; 216 } 217 218 return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP)); 219 } 220 221 /* Return number of OCSP_SINGLERESP reponses present in 222 * a basic response. 223 */ 224 int 225 OCSP_resp_count(OCSP_BASICRESP *bs) 226 { 227 if (!bs) 228 return -1; 229 return sk_OCSP_SINGLERESP_num(bs->tbsResponseData->responses); 230 } 231 232 /* Extract an OCSP_SINGLERESP response with a given index */ 233 OCSP_SINGLERESP * 234 OCSP_resp_get0(OCSP_BASICRESP *bs, int idx) 235 { 236 if (!bs) 237 return NULL; 238 return sk_OCSP_SINGLERESP_value(bs->tbsResponseData->responses, idx); 239 } 240 241 /* Look single response matching a given certificate ID */ 242 int 243 OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last) 244 { 245 int i; 246 STACK_OF(OCSP_SINGLERESP) *sresp; 247 OCSP_SINGLERESP *single; 248 249 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 /* Extract status information from an OCSP_SINGLERESP structure. 265 * Note: the revtime and reason values are only set if the 266 * certificate status is revoked. Returns numerical value of 267 * status. 268 */ 269 int 270 OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason, 271 ASN1_GENERALIZEDTIME **revtime, ASN1_GENERALIZEDTIME **thisupd, 272 ASN1_GENERALIZEDTIME **nextupd) 273 { 274 int ret; 275 OCSP_CERTSTATUS *cst; 276 277 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; 283 284 if (revtime) 285 *revtime = rev->revocationTime; 286 if (reason) { 287 if (rev->revocationReason) 288 *reason = ASN1_ENUMERATED_get( 289 rev->revocationReason); 290 else 291 *reason = -1; 292 } 293 } 294 if (thisupd) 295 *thisupd = single->thisUpdate; 296 if (nextupd) 297 *nextupd = single->nextUpdate; 298 return ret; 299 } 300 301 /* This function combines the previous ones: look up a certificate ID and 302 * if found extract status information. Return 0 is successful. 303 */ 304 int 305 OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status, 306 int *reason, ASN1_GENERALIZEDTIME **revtime, ASN1_GENERALIZEDTIME **thisupd, 307 ASN1_GENERALIZEDTIME **nextupd) 308 { 309 int i; 310 OCSP_SINGLERESP *single; 311 312 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 /* Check validity of thisUpdate and nextUpdate fields. It is possible that the request will 324 * take a few seconds to process and/or the time wont be totally accurate. Therefore to avoid 325 * rejecting otherwise valid time we allow the times to be within 'nsec' of the current time. 326 * Also to avoid accepting very old responses without a nextUpdate field an optional maxage 327 * parameter specifies the maximum age the thisUpdate field can be. 328 */ 329 int 330 OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd, 331 ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec) 332 { 333 time_t t_now, t_tmp; 334 struct tm tm_this, tm_next, tm_tmp; 335 336 time(&t_now); 337 338 /* 339 * Times must explicitly be a GENERALIZEDTIME as per section 340 * 4.2.2.1 of RFC 6960 - It is invalid to accept other times 341 * (such as UTCTIME permitted/required by RFC 5280 for certificates) 342 */ 343 344 /* Check thisUpdate is valid and not more than nsec in the future */ 345 if (asn1_time_parse(thisupd->data, thisupd->length, &tm_this, 346 V_ASN1_GENERALIZEDTIME) != V_ASN1_GENERALIZEDTIME) { 347 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, 348 OCSP_R_ERROR_IN_THISUPDATE_FIELD); 349 return 0; 350 } else { 351 t_tmp = t_now + nsec; 352 if (gmtime_r(&t_tmp, &tm_tmp) == NULL) 353 return 0; 354 if (asn1_tm_cmp(&tm_this, &tm_tmp) > 0) { 355 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, 356 OCSP_R_STATUS_NOT_YET_VALID); 357 return 0; 358 } 359 360 /* 361 * If maxsec specified check thisUpdate is not more than maxsec 362 * in the past 363 */ 364 if (maxsec >= 0) { 365 t_tmp = t_now - maxsec; 366 if (gmtime_r(&t_tmp, &tm_tmp) == NULL) 367 return 0; 368 if (asn1_tm_cmp(&tm_this, &tm_tmp) < 0) { 369 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, 370 OCSP_R_STATUS_TOO_OLD); 371 return 0; 372 } 373 } 374 } 375 376 if (!nextupd) 377 return 1; 378 379 /* Check nextUpdate is valid and not more than nsec in the past */ 380 if (asn1_time_parse(nextupd->data, nextupd->length, &tm_next, 381 V_ASN1_GENERALIZEDTIME) != V_ASN1_GENERALIZEDTIME) { 382 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, 383 OCSP_R_ERROR_IN_NEXTUPDATE_FIELD); 384 return 0; 385 } else { 386 t_tmp = t_now - nsec; 387 if (gmtime_r(&t_tmp, &tm_tmp) == NULL) 388 return 0; 389 if (asn1_tm_cmp(&tm_next, &tm_tmp) < 0) { 390 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, 391 OCSP_R_STATUS_EXPIRED); 392 return 0; 393 } 394 } 395 396 /* Also don't allow nextUpdate to precede thisUpdate */ 397 if (asn1_tm_cmp(&tm_next, &tm_this) < 0) { 398 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, 399 OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE); 400 return 0; 401 } 402 403 return 1; 404 } 405