crypto/ocsp/ocsp_cl.c

   1 /*
   2  * Copyright 2001-2020 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 DEFINE_STACK_OF(X509)
  22 DEFINE_STACK_OF(OCSP_ONEREQ)
  23 DEFINE_STACK_OF(OCSP_SINGLERESP)
  24
  25 /*
  26  * Utility functions related to sending OCSP requests and extracting relevant
  27  * information from the response.
  28  */
  29
  30 /*
  31  * Add an OCSP_CERTID to an OCSP request. Return new OCSP_ONEREQ pointer:
  32  * useful if we want to add extensions.
  33  */
  34
  35 OCSP_ONEREQ *OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid)
  36 {
  37     OCSP_ONEREQ *one = NULL;
  38
  39     if ((one = OCSP_ONEREQ_new()) == NULL)
  40         return NULL;
  41     OCSP_CERTID_free(one->reqCert);
  42     one->reqCert = cid;
  43     if (req && !sk_OCSP_ONEREQ_push(req->tbsRequest.requestList, one)) {
  44         one->reqCert = NULL; /* do not free on error */
  45         goto err;
  46     }
  47     return one;
  48  err:
  49     OCSP_ONEREQ_free(one);
  50     return NULL;
  51 }
  52
  53 /* Set requestorName from an X509_NAME structure */
  54
  55 int OCSP_request_set1_name(OCSP_REQUEST *req, const X509_NAME *nm)
  56 {
  57     GENERAL_NAME *gen;
  58
  59     gen = GENERAL_NAME_new();
  60     if (gen == NULL)
  61         return 0;
  62     if (!X509_NAME_set(&gen->d.directoryName, nm)) {
  63         GENERAL_NAME_free(gen);
  64         return 0;
  65     }
  66     gen->type = GEN_DIRNAME;
  67     GENERAL_NAME_free(req->tbsRequest.requestorName);
  68     req->tbsRequest.requestorName = gen;
  69     return 1;
  70 }
  71
  72 /* Add a certificate to an OCSP request */
  73
  74 int OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert)
  75 {
  76     OCSP_SIGNATURE *sig;
  77     if (req->optionalSignature == NULL)
  78         req->optionalSignature = OCSP_SIGNATURE_new();
  79     sig = req->optionalSignature;
  80     if (sig == NULL)
  81         return 0;
  82     if (cert == NULL)
  83         return 1;
  84     if (sig->certs == NULL
  85         && (sig->certs = sk_X509_new_null()) == NULL)
  86         return 0;
  87
  88     if (!sk_X509_push(sig->certs, cert))
  89         return 0;
  90     X509_up_ref(cert);
  91     return 1;
  92 }
  93
  94 /*
  95  * Sign an OCSP request set the requestorName to the subject name of an
  96  * optional signers certificate and include one or more optional certificates
  97  * in the request. Behaves like PKCS7_sign().
  98  */
  99
 100 int OCSP_request_sign(OCSP_REQUEST *req,
 101                       X509 *signer,
 102                       EVP_PKEY *key,
 103                       const EVP_MD *dgst,
 104                       STACK_OF(X509) *certs, unsigned long flags)
 105 {
 106     int i;
 107     X509 *x;
 108
 109     if (!OCSP_request_set1_name(req, X509_get_subject_name(signer)))
 110         goto err;
 111
 112     if ((req->optionalSignature = OCSP_SIGNATURE_new()) == NULL)
 113         goto err;
 114     if (key) {
 115         if (!X509_check_private_key(signer, key)) {
 116             OCSPerr(OCSP_F_OCSP_REQUEST_SIGN,
 117                     OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 118             goto err;
 119         }
 120         if (!OCSP_REQUEST_sign(req, key, dgst))
 121             goto err;
 122     }
 123
 124     if (!(flags & OCSP_NOCERTS)) {
 125         if (!OCSP_request_add1_cert(req, signer))
 126             goto err;
 127         for (i = 0; i < sk_X509_num(certs); i++) {
 128             x = sk_X509_value(certs, i);
 129             if (!OCSP_request_add1_cert(req, x))
 130                 goto err;
 131         }
 132     }
 133
 134     return 1;
 135  err:
 136     OCSP_SIGNATURE_free(req->optionalSignature);
 137     req->optionalSignature = NULL;
 138     return 0;
 139 }
 140
 141 /* Get response status */
 142
 143 int OCSP_response_status(OCSP_RESPONSE *resp)
 144 {
 145     return ASN1_ENUMERATED_get(resp->responseStatus);
 146 }
 147
 148 /*
 149  * Extract basic response from OCSP_RESPONSE or NULL if no basic response
 150  * present.
 151  */
 152
 153 OCSP_BASICRESP *OCSP_response_get1_basic(OCSP_RESPONSE *resp)
 154 {
 155     OCSP_RESPBYTES *rb;
 156     rb = resp->responseBytes;
 157     if (!rb) {
 158         OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NO_RESPONSE_DATA);
 159         return NULL;
 160     }
 161     if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic) {
 162         OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NOT_BASIC_RESPONSE);
 163         return NULL;
 164     }
 165
 166     return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP));
 167 }
 168
 169 const ASN1_OCTET_STRING *OCSP_resp_get0_signature(const OCSP_BASICRESP *bs)
 170 {
 171     return bs->signature;
 172 }
 173
 174 const X509_ALGOR *OCSP_resp_get0_tbs_sigalg(const OCSP_BASICRESP *bs)
 175 {
 176     return &bs->signatureAlgorithm;
 177 }
 178
 179 const OCSP_RESPDATA *OCSP_resp_get0_respdata(const OCSP_BASICRESP *bs)
 180 {
 181     return &bs->tbsResponseData;
 182 }
 183
 184 /*
 185  * Return number of OCSP_SINGLERESP responses present in a basic response.
 186  */
 187
 188 int OCSP_resp_count(OCSP_BASICRESP *bs)
 189 {
 190     if (!bs)
 191         return -1;
 192     return sk_OCSP_SINGLERESP_num(bs->tbsResponseData.responses);
 193 }
 194
 195 /* Extract an OCSP_SINGLERESP response with a given index */
 196
 197 OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx)
 198 {
 199     if (!bs)
 200         return NULL;
 201     return sk_OCSP_SINGLERESP_value(bs->tbsResponseData.responses, idx);
 202 }
 203
 204 const ASN1_GENERALIZEDTIME *OCSP_resp_get0_produced_at(const OCSP_BASICRESP* bs)
 205 {
 206     return bs->tbsResponseData.producedAt;
 207 }
 208
 209 const STACK_OF(X509) *OCSP_resp_get0_certs(const OCSP_BASICRESP *bs)
 210 {
 211     return bs->certs;
 212 }
 213
 214 int OCSP_resp_get0_id(const OCSP_BASICRESP *bs,
 215                       const ASN1_OCTET_STRING **pid,
 216                       const X509_NAME **pname)
 217 {
 218     const OCSP_RESPID *rid = &bs->tbsResponseData.responderId;
 219
 220     if (rid->type == V_OCSP_RESPID_NAME) {
 221         *pname = rid->value.byName;
 222         *pid = NULL;
 223     } else if (rid->type == V_OCSP_RESPID_KEY) {
 224         *pid = rid->value.byKey;
 225         *pname = NULL;
 226     } else {
 227         return 0;
 228     }
 229     return 1;
 230 }
 231
 232 int OCSP_resp_get1_id(const OCSP_BASICRESP *bs,
 233                       ASN1_OCTET_STRING **pid,
 234                       X509_NAME **pname)
 235 {
 236     const OCSP_RESPID *rid = &bs->tbsResponseData.responderId;
 237
 238     if (rid->type == V_OCSP_RESPID_NAME) {
 239         *pname = X509_NAME_dup(rid->value.byName);
 240         *pid = NULL;
 241     } else if (rid->type == V_OCSP_RESPID_KEY) {
 242         *pid = ASN1_OCTET_STRING_dup(rid->value.byKey);
 243         *pname = NULL;
 244     } else {
 245         return 0;
 246     }
 247     if (*pname == NULL && *pid == NULL)
 248         return 0;
 249     return 1;
 250 }
 251
 252 /* Look single response matching a given certificate ID */
 253
 254 int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last)
 255 {
 256     int i;
 257     STACK_OF(OCSP_SINGLERESP) *sresp;
 258     OCSP_SINGLERESP *single;
 259     if (!bs)
 260         return -1;
 261     if (last < 0)
 262         last = 0;
 263     else
 264         last++;
 265     sresp = bs->tbsResponseData.responses;
 266     for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++) {
 267         single = sk_OCSP_SINGLERESP_value(sresp, i);
 268         if (!OCSP_id_cmp(id, single->certId))
 269             return i;
 270     }
 271     return -1;
 272 }
 273
 274 /*
 275  * Extract status information from an OCSP_SINGLERESP structure. Note: the
 276  * revtime and reason values are only set if the certificate status is
 277  * revoked. Returns numerical value of status.
 278  */
 279
 280 int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason,
 281                             ASN1_GENERALIZEDTIME **revtime,
 282                             ASN1_GENERALIZEDTIME **thisupd,
 283                             ASN1_GENERALIZEDTIME **nextupd)
 284 {
 285     int ret;
 286     OCSP_CERTSTATUS *cst;
 287     if (!single)
 288         return -1;
 289     cst = single->certStatus;
 290     ret = cst->type;
 291     if (ret == V_OCSP_CERTSTATUS_REVOKED) {
 292         OCSP_REVOKEDINFO *rev = cst->value.revoked;
 293         if (revtime)
 294             *revtime = rev->revocationTime;
 295         if (reason) {
 296             if (rev->revocationReason)
 297                 *reason = ASN1_ENUMERATED_get(rev->revocationReason);
 298             else
 299                 *reason = -1;
 300         }
 301     }
 302     if (thisupd)
 303         *thisupd = single->thisUpdate;
 304     if (nextupd)
 305         *nextupd = single->nextUpdate;
 306     return ret;
 307 }
 308
 309 /*
 310  * This function combines the previous ones: look up a certificate ID and if
 311  * found extract status information. Return 0 is successful.
 312  */
 313
 314 int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status,
 315                           int *reason,
 316                           ASN1_GENERALIZEDTIME **revtime,
 317                           ASN1_GENERALIZEDTIME **thisupd,
 318                           ASN1_GENERALIZEDTIME **nextupd)
 319 {
 320     int i;
 321     OCSP_SINGLERESP *single;
 322     i = OCSP_resp_find(bs, id, -1);
 323     /* Maybe check for multiple responses and give an error? */
 324     if (i < 0)
 325         return 0;
 326     single = OCSP_resp_get0(bs, i);
 327     i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd);
 328     if (status)
 329         *status = i;
 330     return 1;
 331 }
 332
 333 /*
 334  * Check validity of thisUpdate and nextUpdate fields. It is possible that
 335  * the request will take a few seconds to process and/or the time won't be
 336  * totally accurate. Therefore to avoid rejecting otherwise valid time we
 337  * allow the times to be within 'nsec' of the current time. Also to avoid
 338  * accepting very old responses without a nextUpdate field an optional maxage
 339  * parameter specifies the maximum age the thisUpdate field can be.
 340  */
 341
 342 int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd,
 343                         ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec)
 344 {
 345     int ret = 1;
 346     time_t t_now, t_tmp;
 347     time(&t_now);
 348     /* Check thisUpdate is valid and not more than nsec in the future */
 349     if (!ASN1_GENERALIZEDTIME_check(thisupd)) {
 350         OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_THISUPDATE_FIELD);
 351         ret = 0;
 352     } else {
 353         t_tmp = t_now + nsec;
 354         if (X509_cmp_time(thisupd, &t_tmp) > 0) {
 355             OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_NOT_YET_VALID);
 356             ret = 0;
 357         }
 358
 359         /*
 360          * If maxsec specified check thisUpdate is not more than maxsec in
 361          * the past
 362          */
 363         if (maxsec >= 0) {
 364             t_tmp = t_now - maxsec;
 365             if (X509_cmp_time(thisupd, &t_tmp) < 0) {
 366                 OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_TOO_OLD);
 367                 ret = 0;
 368             }
 369         }
 370     }
 371
 372     if (!nextupd)
 373         return ret;
 374
 375     /* Check nextUpdate is valid and not more than nsec in the past */
 376     if (!ASN1_GENERALIZEDTIME_check(nextupd)) {
 377         OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_NEXTUPDATE_FIELD);
 378         ret = 0;
 379     } else {
 380         t_tmp = t_now - nsec;
 381         if (X509_cmp_time(nextupd, &t_tmp) < 0) {
 382             OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_EXPIRED);
 383             ret = 0;
 384         }
 385     }
 386
 387     /* Also don't allow nextUpdate to precede thisUpdate */
 388     if (ASN1_STRING_cmp(nextupd, thisupd) < 0) {
 389         OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY,
 390                 OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE);
 391         ret = 0;
 392     }
 393
 394     return ret;
 395 }
 396
 397 const OCSP_CERTID *OCSP_SINGLERESP_get0_id(const OCSP_SINGLERESP *single)
 398 {
 399     return single->certId;
 400 }