ocsp_cl.c revision 1.14
1/* $OpenBSD: ocsp_cl.c,v 1.14 2017/01/29 17:49:23 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/* Utility functions related to sending OCSP requests and extracting 75 * relevant information from the response. 76 */ 77 78/* Add an OCSP_CERTID to an OCSP request. Return new OCSP_ONEREQ 79 * pointer: useful if we want to add extensions. 80 */ 81OCSP_ONEREQ * 82OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid) 83{ 84 OCSP_ONEREQ *one = NULL; 85 86 if (!(one = OCSP_ONEREQ_new())) 87 goto err; 88 if (one->reqCert) 89 OCSP_CERTID_free(one->reqCert); 90 one->reqCert = cid; 91 if (req && !sk_OCSP_ONEREQ_push(req->tbsRequest->requestList, one)) 92 goto err; 93 return one; 94 95err: 96 OCSP_ONEREQ_free(one); 97 return NULL; 98} 99 100/* Set requestorName from an X509_NAME structure */ 101int 102OCSP_request_set1_name(OCSP_REQUEST *req, X509_NAME *nm) 103{ 104 GENERAL_NAME *gen; 105 106 gen = GENERAL_NAME_new(); 107 if (gen == NULL) 108 return 0; 109 if (!X509_NAME_set(&gen->d.directoryName, nm)) { 110 GENERAL_NAME_free(gen); 111 return 0; 112 } 113 gen->type = GEN_DIRNAME; 114 if (req->tbsRequest->requestorName) 115 GENERAL_NAME_free(req->tbsRequest->requestorName); 116 req->tbsRequest->requestorName = gen; 117 return 1; 118} 119 120/* Add a certificate to an OCSP request */ 121int 122OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert) 123{ 124 OCSP_SIGNATURE *sig; 125 126 if (!req->optionalSignature) 127 req->optionalSignature = OCSP_SIGNATURE_new(); 128 sig = req->optionalSignature; 129 if (!sig) 130 return 0; 131 if (!cert) 132 return 1; 133 if (!sig->certs && !(sig->certs = sk_X509_new_null())) 134 return 0; 135 136 if (!sk_X509_push(sig->certs, cert)) 137 return 0; 138 CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509); 139 return 1; 140} 141 142/* Sign an OCSP request set the requestorName to the subjec 143 * name of an optional signers certificate and include one 144 * or more optional certificates in the request. Behaves 145 * like PKCS7_sign(). 146 */ 147int 148OCSP_request_sign(OCSP_REQUEST *req, X509 *signer, EVP_PKEY *key, 149 const EVP_MD *dgst, STACK_OF(X509) *certs, unsigned long flags) 150{ 151 int i; 152 OCSP_SIGNATURE *sig; 153 X509 *x; 154 155 if (!OCSP_request_set1_name(req, X509_get_subject_name(signer))) 156 goto err; 157 158 if (!(req->optionalSignature = sig = OCSP_SIGNATURE_new())) 159 goto err; 160 if (key) { 161 if (!X509_check_private_key(signer, key)) { 162 OCSPerror(OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 163 goto err; 164 } 165 if (!OCSP_REQUEST_sign(req, key, dgst)) 166 goto err; 167 } 168 169 if (!(flags & OCSP_NOCERTS)) { 170 if (!OCSP_request_add1_cert(req, signer)) 171 goto err; 172 for (i = 0; i < sk_X509_num(certs); i++) { 173 x = sk_X509_value(certs, i); 174 if (!OCSP_request_add1_cert(req, x)) 175 goto err; 176 } 177 } 178 179 return 1; 180 181err: 182 OCSP_SIGNATURE_free(req->optionalSignature); 183 req->optionalSignature = NULL; 184 return 0; 185} 186 187/* Get response status */ 188int 189OCSP_response_status(OCSP_RESPONSE *resp) 190{ 191 return ASN1_ENUMERATED_get(resp->responseStatus); 192} 193 194/* Extract basic response from OCSP_RESPONSE or NULL if 195 * no basic response present. 196 */ 197OCSP_BASICRESP * 198OCSP_response_get1_basic(OCSP_RESPONSE *resp) 199{ 200 OCSP_RESPBYTES *rb; 201 202 rb = resp->responseBytes; 203 if (!rb) { 204 OCSPerror(OCSP_R_NO_RESPONSE_DATA); 205 return NULL; 206 } 207 if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic) { 208 OCSPerror(OCSP_R_NOT_BASIC_RESPONSE); 209 return NULL; 210 } 211 212 return ASN1_item_unpack(rb->response, &OCSP_BASICRESP_it); 213} 214 215/* Return number of OCSP_SINGLERESP reponses present in 216 * a basic response. 217 */ 218int 219OCSP_resp_count(OCSP_BASICRESP *bs) 220{ 221 if (!bs) 222 return -1; 223 return sk_OCSP_SINGLERESP_num(bs->tbsResponseData->responses); 224} 225 226/* Extract an OCSP_SINGLERESP response with a given index */ 227OCSP_SINGLERESP * 228OCSP_resp_get0(OCSP_BASICRESP *bs, int idx) 229{ 230 if (!bs) 231 return NULL; 232 return sk_OCSP_SINGLERESP_value(bs->tbsResponseData->responses, idx); 233} 234 235/* Look single response matching a given certificate ID */ 236int 237OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last) 238{ 239 int i; 240 STACK_OF(OCSP_SINGLERESP) *sresp; 241 OCSP_SINGLERESP *single; 242 243 if (!bs) 244 return -1; 245 if (last < 0) 246 last = 0; 247 else 248 last++; 249 sresp = bs->tbsResponseData->responses; 250 for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++) { 251 single = sk_OCSP_SINGLERESP_value(sresp, i); 252 if (!OCSP_id_cmp(id, single->certId)) 253 return i; 254 } 255 return -1; 256} 257 258/* Extract status information from an OCSP_SINGLERESP structure. 259 * Note: the revtime and reason values are only set if the 260 * certificate status is revoked. Returns numerical value of 261 * status. 262 */ 263int 264OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason, 265 ASN1_GENERALIZEDTIME **revtime, ASN1_GENERALIZEDTIME **thisupd, 266 ASN1_GENERALIZEDTIME **nextupd) 267{ 268 int ret; 269 OCSP_CERTSTATUS *cst; 270 271 if (!single) 272 return -1; 273 cst = single->certStatus; 274 ret = cst->type; 275 if (ret == V_OCSP_CERTSTATUS_REVOKED) { 276 OCSP_REVOKEDINFO *rev = cst->value.revoked; 277 278 if (revtime) 279 *revtime = rev->revocationTime; 280 if (reason) { 281 if (rev->revocationReason) 282 *reason = ASN1_ENUMERATED_get( 283 rev->revocationReason); 284 else 285 *reason = -1; 286 } 287 } 288 if (thisupd) 289 *thisupd = single->thisUpdate; 290 if (nextupd) 291 *nextupd = single->nextUpdate; 292 return ret; 293} 294 295/* This function combines the previous ones: look up a certificate ID and 296 * if found extract status information. Return 0 is successful. 297 */ 298int 299OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status, 300 int *reason, ASN1_GENERALIZEDTIME **revtime, ASN1_GENERALIZEDTIME **thisupd, 301 ASN1_GENERALIZEDTIME **nextupd) 302{ 303 int i; 304 OCSP_SINGLERESP *single; 305 306 i = OCSP_resp_find(bs, id, -1); 307 /* Maybe check for multiple responses and give an error? */ 308 if (i < 0) 309 return 0; 310 single = OCSP_resp_get0(bs, i); 311 i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd); 312 if (status) 313 *status = i; 314 return 1; 315} 316 317/* Check validity of thisUpdate and nextUpdate fields. It is possible that the request will 318 * take a few seconds to process and/or the time wont be totally accurate. Therefore to avoid 319 * rejecting otherwise valid time we allow the times to be within 'nsec' of the current time. 320 * Also to avoid accepting very old responses without a nextUpdate field an optional maxage 321 * parameter specifies the maximum age the thisUpdate field can be. 322 */ 323int 324OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd, 325 ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec) 326{ 327 time_t t_now, t_tmp; 328 struct tm tm_this, tm_next, tm_tmp; 329 330 time(&t_now); 331 332 /* 333 * Times must explicitly be a GENERALIZEDTIME as per section 334 * 4.2.2.1 of RFC 6960 - It is invalid to accept other times 335 * (such as UTCTIME permitted/required by RFC 5280 for certificates) 336 */ 337 338 /* Check thisUpdate is valid and not more than nsec in the future */ 339 if (ASN1_time_parse(thisupd->data, thisupd->length, &tm_this, 340 V_ASN1_GENERALIZEDTIME) != V_ASN1_GENERALIZEDTIME) { 341 OCSPerror(OCSP_R_ERROR_IN_THISUPDATE_FIELD); 342 return 0; 343 } else { 344 t_tmp = t_now + nsec; 345 if (gmtime_r(&t_tmp, &tm_tmp) == NULL) 346 return 0; 347 if (ASN1_time_tm_cmp(&tm_this, &tm_tmp) > 0) { 348 OCSPerror(OCSP_R_STATUS_NOT_YET_VALID); 349 return 0; 350 } 351 352 /* 353 * If maxsec specified check thisUpdate is not more than maxsec 354 * in the past 355 */ 356 if (maxsec >= 0) { 357 t_tmp = t_now - maxsec; 358 if (gmtime_r(&t_tmp, &tm_tmp) == NULL) 359 return 0; 360 if (ASN1_time_tm_cmp(&tm_this, &tm_tmp) < 0) { 361 OCSPerror(OCSP_R_STATUS_TOO_OLD); 362 return 0; 363 } 364 } 365 } 366 367 if (!nextupd) 368 return 1; 369 370 /* Check nextUpdate is valid and not more than nsec in the past */ 371 if (ASN1_time_parse(nextupd->data, nextupd->length, &tm_next, 372 V_ASN1_GENERALIZEDTIME) != V_ASN1_GENERALIZEDTIME) { 373 OCSPerror(OCSP_R_ERROR_IN_NEXTUPDATE_FIELD); 374 return 0; 375 } else { 376 t_tmp = t_now - nsec; 377 if (gmtime_r(&t_tmp, &tm_tmp) == NULL) 378 return 0; 379 if (ASN1_time_tm_cmp(&tm_next, &tm_tmp) < 0) { 380 OCSPerror(OCSP_R_STATUS_EXPIRED); 381 return 0; 382 } 383 } 384 385 /* Also don't allow nextUpdate to precede thisUpdate */ 386 if (ASN1_time_tm_cmp(&tm_next, &tm_this) < 0) { 387 OCSPerror(OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE); 388 return 0; 389 } 390 391 return 1; 392} 393