1 /* 2 * Copyright 2001-2021 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #include <stdio.h> 11 #include <time.h> 12 #include "internal/cryptlib.h" 13 #include <openssl/asn1.h> 14 #include <openssl/objects.h> 15 #include <openssl/x509.h> 16 #include <openssl/pem.h> 17 #include <openssl/x509v3.h> 18 #include <openssl/ocsp.h> 19 #include "ocsp_local.h" 20 21 /* 22 * Utility functions related to sending OCSP requests and extracting relevant 23 * information from the response. 24 */ 25 26 /* 27 * Add an OCSP_CERTID to an OCSP request. Return new OCSP_ONEREQ pointer: 28 * useful if we want to add extensions. 29 */ 30 OCSP_ONEREQ *OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid) 31 { 32 OCSP_ONEREQ *one = NULL; 33 34 if ((one = OCSP_ONEREQ_new()) == NULL) 35 return NULL; 36 OCSP_CERTID_free(one->reqCert); 37 one->reqCert = cid; 38 if (req && !sk_OCSP_ONEREQ_push(req->tbsRequest.requestList, one)) { 39 one->reqCert = NULL; /* do not free on error */ 40 OCSP_ONEREQ_free(one); 41 return NULL; 42 } 43 return one; 44 } 45 46 /* Set requestorName from an X509_NAME structure */ 47 int OCSP_request_set1_name(OCSP_REQUEST *req, const X509_NAME *nm) 48 { 49 GENERAL_NAME *gen = GENERAL_NAME_new(); 50 51 if (gen == NULL) 52 return 0; 53 if (!X509_NAME_set(&gen->d.directoryName, nm)) { 54 GENERAL_NAME_free(gen); 55 return 0; 56 } 57 gen->type = GEN_DIRNAME; 58 GENERAL_NAME_free(req->tbsRequest.requestorName); 59 req->tbsRequest.requestorName = gen; 60 return 1; 61 } 62 63 /* Add a certificate to an OCSP request */ 64 int OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert) 65 { 66 if (req->optionalSignature == NULL 67 && (req->optionalSignature = OCSP_SIGNATURE_new()) == NULL) 68 return 0; 69 if (cert == NULL) 70 return 1; 71 return ossl_x509_add_cert_new(&req->optionalSignature->certs, cert, 72 X509_ADD_FLAG_UP_REF); 73 } 74 75 /* 76 * Sign an OCSP request set the requestorName to the subject name of an 77 * optional signers certificate and include one or more optional certificates 78 * in the request. Behaves like PKCS7_sign(). 79 */ 80 int OCSP_request_sign(OCSP_REQUEST *req, 81 X509 *signer, 82 EVP_PKEY *key, 83 const EVP_MD *dgst, 84 STACK_OF(X509) *certs, unsigned long flags) 85 { 86 if (!OCSP_request_set1_name(req, X509_get_subject_name(signer))) 87 goto err; 88 89 if ((req->optionalSignature = OCSP_SIGNATURE_new()) == NULL) 90 goto err; 91 if (key != NULL) { 92 if (!X509_check_private_key(signer, key)) { 93 ERR_raise(ERR_LIB_OCSP, 94 OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 95 goto err; 96 } 97 if (!OCSP_REQUEST_sign(req, key, dgst, signer->libctx, signer->propq)) 98 goto err; 99 } 100 101 if ((flags & OCSP_NOCERTS) == 0) { 102 if (!OCSP_request_add1_cert(req, signer) 103 || !X509_add_certs(req->optionalSignature->certs, certs, 104 X509_ADD_FLAG_UP_REF)) 105 goto err; 106 } 107 108 return 1; 109 err: 110 OCSP_SIGNATURE_free(req->optionalSignature); 111 req->optionalSignature = NULL; 112 return 0; 113 } 114 115 /* Get response status */ 116 int OCSP_response_status(OCSP_RESPONSE *resp) 117 { 118 return ASN1_ENUMERATED_get(resp->responseStatus); 119 } 120 121 /* 122 * Extract basic response from OCSP_RESPONSE or NULL if no basic response 123 * present. 124 */ 125 OCSP_BASICRESP *OCSP_response_get1_basic(OCSP_RESPONSE *resp) 126 { 127 OCSP_RESPBYTES *rb = resp->responseBytes; 128 129 if (rb == NULL) { 130 ERR_raise(ERR_LIB_OCSP, OCSP_R_NO_RESPONSE_DATA); 131 return NULL; 132 } 133 if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic) { 134 ERR_raise(ERR_LIB_OCSP, OCSP_R_NOT_BASIC_RESPONSE); 135 return NULL; 136 } 137 138 return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP)); 139 } 140 141 const ASN1_OCTET_STRING *OCSP_resp_get0_signature(const OCSP_BASICRESP *bs) 142 { 143 return bs->signature; 144 } 145 146 const X509_ALGOR *OCSP_resp_get0_tbs_sigalg(const OCSP_BASICRESP *bs) 147 { 148 return &bs->signatureAlgorithm; 149 } 150 151 const OCSP_RESPDATA *OCSP_resp_get0_respdata(const OCSP_BASICRESP *bs) 152 { 153 return &bs->tbsResponseData; 154 } 155 156 /* Return number of OCSP_SINGLERESP responses present in a basic response */ 157 158 int OCSP_resp_count(OCSP_BASICRESP *bs) 159 { 160 if (bs == NULL) 161 return -1; 162 return sk_OCSP_SINGLERESP_num(bs->tbsResponseData.responses); 163 } 164 165 /* Extract an OCSP_SINGLERESP response with a given index */ 166 OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx) 167 { 168 if (bs == NULL) 169 return NULL; 170 return sk_OCSP_SINGLERESP_value(bs->tbsResponseData.responses, idx); 171 } 172 173 const ASN1_GENERALIZEDTIME *OCSP_resp_get0_produced_at(const OCSP_BASICRESP *bs) 174 { 175 return bs->tbsResponseData.producedAt; 176 } 177 178 const STACK_OF(X509) *OCSP_resp_get0_certs(const OCSP_BASICRESP *bs) 179 { 180 return bs->certs; 181 } 182 183 int OCSP_resp_get0_id(const OCSP_BASICRESP *bs, 184 const ASN1_OCTET_STRING **pid, 185 const X509_NAME **pname) 186 { 187 const OCSP_RESPID *rid = &bs->tbsResponseData.responderId; 188 189 if (rid->type == V_OCSP_RESPID_NAME) { 190 *pname = rid->value.byName; 191 *pid = NULL; 192 } else if (rid->type == V_OCSP_RESPID_KEY) { 193 *pid = rid->value.byKey; 194 *pname = NULL; 195 } else { 196 return 0; 197 } 198 return 1; 199 } 200 201 int OCSP_resp_get1_id(const OCSP_BASICRESP *bs, 202 ASN1_OCTET_STRING **pid, 203 X509_NAME **pname) 204 { 205 const OCSP_RESPID *rid = &bs->tbsResponseData.responderId; 206 207 if (rid->type == V_OCSP_RESPID_NAME) { 208 *pname = X509_NAME_dup(rid->value.byName); 209 *pid = NULL; 210 } else if (rid->type == V_OCSP_RESPID_KEY) { 211 *pid = ASN1_OCTET_STRING_dup(rid->value.byKey); 212 *pname = NULL; 213 } else { 214 return 0; 215 } 216 if (*pname == NULL && *pid == NULL) 217 return 0; 218 return 1; 219 } 220 221 /* Look single response matching a given certificate ID */ 222 int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last) 223 { 224 int i; 225 STACK_OF(OCSP_SINGLERESP) *sresp; 226 OCSP_SINGLERESP *single; 227 228 if (bs == NULL) 229 return -1; 230 if (last < 0) 231 last = 0; 232 else 233 last++; 234 sresp = bs->tbsResponseData.responses; 235 for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++) { 236 single = sk_OCSP_SINGLERESP_value(sresp, i); 237 if (!OCSP_id_cmp(id, single->certId)) 238 return i; 239 } 240 return -1; 241 } 242 243 /* 244 * Extract status information from an OCSP_SINGLERESP structure. Note: the 245 * revtime and reason values are only set if the certificate status is 246 * revoked. Returns numerical value of status. 247 */ 248 int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason, 249 ASN1_GENERALIZEDTIME **revtime, 250 ASN1_GENERALIZEDTIME **thisupd, 251 ASN1_GENERALIZEDTIME **nextupd) 252 { 253 int ret; 254 OCSP_CERTSTATUS *cst; 255 256 if (single == NULL) 257 return -1; 258 cst = single->certStatus; 259 ret = cst->type; 260 if (ret == V_OCSP_CERTSTATUS_REVOKED) { 261 OCSP_REVOKEDINFO *rev = cst->value.revoked; 262 263 if (revtime) 264 *revtime = rev->revocationTime; 265 if (reason) { 266 if (rev->revocationReason) 267 *reason = ASN1_ENUMERATED_get(rev->revocationReason); 268 else 269 *reason = -1; 270 } 271 } 272 if (thisupd != NULL) 273 *thisupd = single->thisUpdate; 274 if (nextupd != NULL) 275 *nextupd = single->nextUpdate; 276 return ret; 277 } 278 279 /* 280 * This function combines the previous ones: look up a certificate ID and if 281 * found extract status information. Return 0 is successful. 282 */ 283 int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status, 284 int *reason, 285 ASN1_GENERALIZEDTIME **revtime, 286 ASN1_GENERALIZEDTIME **thisupd, 287 ASN1_GENERALIZEDTIME **nextupd) 288 { 289 int i = OCSP_resp_find(bs, id, -1); 290 OCSP_SINGLERESP *single; 291 292 /* Maybe check for multiple responses and give an error? */ 293 if (i < 0) 294 return 0; 295 single = OCSP_resp_get0(bs, i); 296 i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd); 297 if (status != NULL) 298 *status = i; 299 return 1; 300 } 301 302 /* 303 * Check validity of thisUpdate and nextUpdate fields. It is possible that 304 * the request will take a few seconds to process and/or the time won't be 305 * totally accurate. Therefore to avoid rejecting otherwise valid time we 306 * allow the times to be within 'nsec' of the current time. Also to avoid 307 * accepting very old responses without a nextUpdate field an optional maxage 308 * parameter specifies the maximum age the thisUpdate field can be. 309 */ 310 int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd, 311 ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec) 312 { 313 int ret = 1; 314 time_t t_now, t_tmp; 315 316 time(&t_now); 317 /* Check thisUpdate is valid and not more than nsec in the future */ 318 if (!ASN1_GENERALIZEDTIME_check(thisupd)) { 319 ERR_raise(ERR_LIB_OCSP, OCSP_R_ERROR_IN_THISUPDATE_FIELD); 320 ret = 0; 321 } else { 322 t_tmp = t_now + nsec; 323 if (X509_cmp_time(thisupd, &t_tmp) > 0) { 324 ERR_raise(ERR_LIB_OCSP, OCSP_R_STATUS_NOT_YET_VALID); 325 ret = 0; 326 } 327 328 /* 329 * If maxsec specified check thisUpdate is not more than maxsec in 330 * the past 331 */ 332 if (maxsec >= 0) { 333 t_tmp = t_now - maxsec; 334 if (X509_cmp_time(thisupd, &t_tmp) < 0) { 335 ERR_raise(ERR_LIB_OCSP, OCSP_R_STATUS_TOO_OLD); 336 ret = 0; 337 } 338 } 339 } 340 341 if (nextupd == NULL) 342 return ret; 343 344 /* Check nextUpdate is valid and not more than nsec in the past */ 345 if (!ASN1_GENERALIZEDTIME_check(nextupd)) { 346 ERR_raise(ERR_LIB_OCSP, OCSP_R_ERROR_IN_NEXTUPDATE_FIELD); 347 ret = 0; 348 } else { 349 t_tmp = t_now - nsec; 350 if (X509_cmp_time(nextupd, &t_tmp) < 0) { 351 ERR_raise(ERR_LIB_OCSP, OCSP_R_STATUS_EXPIRED); 352 ret = 0; 353 } 354 } 355 356 /* Also don't allow nextUpdate to precede thisUpdate */ 357 if (ASN1_STRING_cmp(nextupd, thisupd) < 0) { 358 ERR_raise(ERR_LIB_OCSP, OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE); 359 ret = 0; 360 } 361 362 return ret; 363 } 364 365 const OCSP_CERTID *OCSP_SINGLERESP_get0_id(const OCSP_SINGLERESP *single) 366 { 367 return single->certId; 368 } 369