crypto/ocsp/ocsp_srv.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 "internal/cryptlib.h"
  12 #include <openssl/objects.h>
  13 #include <openssl/x509.h>
  14 #include <openssl/pem.h>
  15 #include <openssl/x509v3.h>
  16 #include <openssl/ocsp.h>
  17 #include "ocsp_local.h"
  18
  19 /*
  20  * Utility functions related to sending OCSP responses and extracting
  21  * relevant information from the request.
  22  */
  23
  24 int OCSP_request_onereq_count(OCSP_REQUEST *req)
  25 {
  26     return sk_OCSP_ONEREQ_num(req->tbsRequest.requestList);
  27 }
  28
  29 OCSP_ONEREQ *OCSP_request_onereq_get0(OCSP_REQUEST *req, int i)
  30 {
  31     return sk_OCSP_ONEREQ_value(req->tbsRequest.requestList, i);
  32 }
  33
  34 OCSP_CERTID *OCSP_onereq_get0_id(OCSP_ONEREQ *one)
  35 {
  36     return one->reqCert;
  37 }
  38
  39 int OCSP_id_get0_info(ASN1_OCTET_STRING **piNameHash, ASN1_OBJECT **pmd,
  40                       ASN1_OCTET_STRING **pikeyHash,
  41                       ASN1_INTEGER **pserial, OCSP_CERTID *cid)
  42 {
  43     if (!cid)
  44         return 0;
  45     if (pmd)
  46         *pmd = cid->hashAlgorithm.algorithm;
  47     if (piNameHash)
  48         *piNameHash = &cid->issuerNameHash;
  49     if (pikeyHash)
  50         *pikeyHash = &cid->issuerKeyHash;
  51     if (pserial)
  52         *pserial = &cid->serialNumber;
  53     return 1;
  54 }
  55
  56 int OCSP_request_is_signed(OCSP_REQUEST *req)
  57 {
  58     if (req->optionalSignature)
  59         return 1;
  60     return 0;
  61 }
  62
  63 /* Create an OCSP response and encode an optional basic response */
  64 OCSP_RESPONSE *OCSP_response_create(int status, OCSP_BASICRESP *bs)
  65 {
  66     OCSP_RESPONSE *rsp = NULL;
  67
  68     if ((rsp = OCSP_RESPONSE_new()) == NULL)
  69         goto err;
  70     if (!(ASN1_ENUMERATED_set(rsp->responseStatus, status)))
  71         goto err;
  72     if (!bs)
  73         return rsp;
  74     if ((rsp->responseBytes = OCSP_RESPBYTES_new()) == NULL)
  75         goto err;
  76     rsp->responseBytes->responseType = OBJ_nid2obj(NID_id_pkix_OCSP_basic);
  77     if (!ASN1_item_pack
  78         (bs, ASN1_ITEM_rptr(OCSP_BASICRESP), &rsp->responseBytes->response))
  79          goto err;
  80     return rsp;
  81  err:
  82     OCSP_RESPONSE_free(rsp);
  83     return NULL;
  84 }
  85
  86 OCSP_SINGLERESP *OCSP_basic_add1_status(OCSP_BASICRESP *rsp,
  87                                         OCSP_CERTID *cid,
  88                                         int status, int reason,
  89                                         ASN1_TIME *revtime,
  90                                         ASN1_TIME *thisupd,
  91                                         ASN1_TIME *nextupd)
  92 {
  93     OCSP_SINGLERESP *single = NULL;
  94     OCSP_CERTSTATUS *cs;
  95     OCSP_REVOKEDINFO *ri;
  96
  97     if (rsp->tbsResponseData.responses == NULL
  98         && (rsp->tbsResponseData.responses
  99                 = sk_OCSP_SINGLERESP_new_null()) == NULL)
 100         goto err;
 101
 102     if ((single = OCSP_SINGLERESP_new()) == NULL)
 103         goto err;
 104
 105     if (!ASN1_TIME_to_generalizedtime(thisupd, &single->thisUpdate))
 106         goto err;
 107     if (nextupd &&
 108         !ASN1_TIME_to_generalizedtime(nextupd, &single->nextUpdate))
 109         goto err;
 110
 111     OCSP_CERTID_free(single->certId);
 112
 113     if ((single->certId = OCSP_CERTID_dup(cid)) == NULL)
 114         goto err;
 115
 116     cs = single->certStatus;
 117     switch (cs->type = status) {
 118     case V_OCSP_CERTSTATUS_REVOKED:
 119         if (!revtime) {
 120             ERR_raise(ERR_LIB_OCSP, OCSP_R_NO_REVOKED_TIME);
 121             goto err;
 122         }
 123         if ((cs->value.revoked = ri = OCSP_REVOKEDINFO_new()) == NULL)
 124             goto err;
 125         if (!ASN1_TIME_to_generalizedtime(revtime, &ri->revocationTime))
 126             goto err;
 127         if (reason != OCSP_REVOKED_STATUS_NOSTATUS) {
 128             if ((ri->revocationReason = ASN1_ENUMERATED_new()) == NULL)
 129                 goto err;
 130             if (!(ASN1_ENUMERATED_set(ri->revocationReason, reason)))
 131                 goto err;
 132         }
 133         break;
 134
 135     case V_OCSP_CERTSTATUS_GOOD:
 136         if ((cs->value.good = ASN1_NULL_new()) == NULL)
 137             goto err;
 138         break;
 139
 140     case V_OCSP_CERTSTATUS_UNKNOWN:
 141         if ((cs->value.unknown = ASN1_NULL_new()) == NULL)
 142             goto err;
 143         break;
 144
 145     default:
 146         goto err;
 147
 148     }
 149     if (!(sk_OCSP_SINGLERESP_push(rsp->tbsResponseData.responses, single)))
 150         goto err;
 151     return single;
 152  err:
 153     OCSP_SINGLERESP_free(single);
 154     return NULL;
 155 }
 156
 157 /* Add a certificate to an OCSP request */
 158
 159 int OCSP_basic_add1_cert(OCSP_BASICRESP *resp, X509 *cert)
 160 {
 161     return X509_add_cert_new(&resp->certs, cert, X509_ADD_FLAG_UP_REF);
 162 }
 163
 164 /*
 165  * Sign an OCSP response using the parameters contained in the digest context,
 166  * set the responderID to the subject name in the signer's certificate, and
 167  * include one or more optional certificates in the response.
 168  */
 169
 170 int OCSP_basic_sign_ctx(OCSP_BASICRESP *brsp,
 171                     X509 *signer, EVP_MD_CTX *ctx,
 172                     STACK_OF(X509) *certs, unsigned long flags)
 173 {
 174     int i;
 175     OCSP_RESPID *rid;
 176     EVP_PKEY *pkey;
 177
 178     if (ctx == NULL || EVP_MD_CTX_pkey_ctx(ctx) == NULL) {
 179         ERR_raise(ERR_LIB_OCSP, OCSP_R_NO_SIGNER_KEY);
 180         goto err;
 181     }
 182
 183     pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_pkey_ctx(ctx));
 184     if (pkey == NULL || !X509_check_private_key(signer, pkey)) {
 185         ERR_raise(ERR_LIB_OCSP, OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 186         goto err;
 187     }
 188
 189     if (!(flags & OCSP_NOCERTS)) {
 190         if (!OCSP_basic_add1_cert(brsp, signer))
 191             goto err;
 192         for (i = 0; i < sk_X509_num(certs); i++) {
 193             X509 *tmpcert = sk_X509_value(certs, i);
 194             if (!OCSP_basic_add1_cert(brsp, tmpcert))
 195                 goto err;
 196         }
 197     }
 198
 199     rid = &brsp->tbsResponseData.responderId;
 200     if (flags & OCSP_RESPID_KEY) {
 201         if (!OCSP_RESPID_set_by_key(rid, signer))
 202             goto err;
 203     } else if (!OCSP_RESPID_set_by_name(rid, signer)) {
 204         goto err;
 205     }
 206
 207     if (!(flags & OCSP_NOTIME) &&
 208         !X509_gmtime_adj(brsp->tbsResponseData.producedAt, 0))
 209         goto err;
 210
 211     /*
 212      * Right now, I think that not doing double hashing is the right thing.
 213      * -- Richard Levitte
 214      */
 215
 216     if (!OCSP_BASICRESP_sign_ctx(brsp, ctx, 0))
 217         goto err;
 218
 219     return 1;
 220  err:
 221     return 0;
 222 }
 223
 224 int OCSP_basic_sign(OCSP_BASICRESP *brsp,
 225                     X509 *signer, EVP_PKEY *key, const EVP_MD *dgst,
 226                     STACK_OF(X509) *certs, unsigned long flags)
 227 {
 228     EVP_MD_CTX *ctx = EVP_MD_CTX_new();
 229     EVP_PKEY_CTX *pkctx = NULL;
 230     int i;
 231
 232     if (ctx == NULL)
 233         return 0;
 234
 235     if (!EVP_DigestSignInit(ctx, &pkctx, dgst, NULL, key)) {
 236         EVP_MD_CTX_free(ctx);
 237         return 0;
 238     }
 239     i = OCSP_basic_sign_ctx(brsp, signer, ctx, certs, flags);
 240     EVP_MD_CTX_free(ctx);
 241     return i;
 242 }
 243
 244 int OCSP_RESPID_set_by_name(OCSP_RESPID *respid, X509 *cert)
 245 {
 246     if (!X509_NAME_set(&respid->value.byName, X509_get_subject_name(cert)))
 247         return 0;
 248
 249     respid->type = V_OCSP_RESPID_NAME;
 250
 251     return 1;
 252 }
 253
 254 int OCSP_RESPID_set_by_key_ex(OCSP_RESPID *respid, X509 *cert,
 255                               OSSL_LIB_CTX *libctx, const char *propq)
 256 {
 257     ASN1_OCTET_STRING *byKey = NULL;
 258     unsigned char md[SHA_DIGEST_LENGTH];
 259     EVP_MD *sha1 = EVP_MD_fetch(libctx, "SHA1", propq);
 260     int ret = 0;
 261
 262     if (sha1 == NULL)
 263         return 0;
 264
 265     /* RFC2560 requires SHA1 */
 266     if (!X509_pubkey_digest(cert, sha1, md, NULL))
 267         goto err;
 268
 269     byKey = ASN1_OCTET_STRING_new();
 270     if (byKey == NULL)
 271         goto err;
 272
 273     if (!(ASN1_OCTET_STRING_set(byKey, md, SHA_DIGEST_LENGTH))) {
 274         ASN1_OCTET_STRING_free(byKey);
 275         goto err;
 276     }
 277
 278     respid->type = V_OCSP_RESPID_KEY;
 279     respid->value.byKey = byKey;
 280
 281     ret = 1;
 282  err:
 283     EVP_MD_free(sha1);
 284     return ret;
 285 }
 286
 287 int OCSP_RESPID_set_by_key(OCSP_RESPID *respid, X509 *cert)
 288 {
 289     return OCSP_RESPID_set_by_key_ex(respid, cert, NULL, NULL);
 290 }
 291
 292 int OCSP_RESPID_match_ex(OCSP_RESPID *respid, X509 *cert, OSSL_LIB_CTX *libctx,
 293                          const char *propq)
 294 {
 295     EVP_MD *sha1 = NULL;
 296     int ret = 0;
 297
 298     if (respid->type == V_OCSP_RESPID_KEY) {
 299         unsigned char md[SHA_DIGEST_LENGTH];
 300
 301         sha1 = EVP_MD_fetch(libctx, "SHA1", propq);
 302         if (sha1 == NULL)
 303             goto err;
 304
 305         if (respid->value.byKey == NULL)
 306             goto err;
 307
 308         /* RFC2560 requires SHA1 */
 309         if (!X509_pubkey_digest(cert, sha1, md, NULL))
 310             goto err;
 311
 312         ret = (ASN1_STRING_length(respid->value.byKey) == SHA_DIGEST_LENGTH)
 313               && (memcmp(ASN1_STRING_get0_data(respid->value.byKey), md,
 314                          SHA_DIGEST_LENGTH) == 0);
 315     } else if (respid->type == V_OCSP_RESPID_NAME) {
 316         if (respid->value.byName == NULL)
 317             return 0;
 318
 319         return X509_NAME_cmp(respid->value.byName,
 320                              X509_get_subject_name(cert)) == 0;
 321     }
 322
 323  err:
 324     EVP_MD_free(sha1);
 325     return ret;
 326 }
 327
 328 int OCSP_RESPID_match(OCSP_RESPID *respid, X509 *cert)
 329 {
 330     return OCSP_RESPID_match_ex(respid, cert, NULL, NULL);
 331 }