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 "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 */
23int OCSP_request_onereq_count(OCSP_REQUEST *req)
24{
25    return sk_OCSP_ONEREQ_num(req->tbsRequest.requestList);
26}
27
28OCSP_ONEREQ *OCSP_request_onereq_get0(OCSP_REQUEST *req, int i)
29{
30    return sk_OCSP_ONEREQ_value(req->tbsRequest.requestList, i);
31}
32
33OCSP_CERTID *OCSP_onereq_get0_id(OCSP_ONEREQ *one)
34{
35    return one->reqCert;
36}
37
38int OCSP_id_get0_info(ASN1_OCTET_STRING **piNameHash, ASN1_OBJECT **pmd,
39                      ASN1_OCTET_STRING **pikeyHash,
40                      ASN1_INTEGER **pserial, OCSP_CERTID *cid)
41{
42    if (!cid)
43        return 0;
44    if (pmd)
45        *pmd = cid->hashAlgorithm.algorithm;
46    if (piNameHash)
47        *piNameHash = &cid->issuerNameHash;
48    if (pikeyHash)
49        *pikeyHash = &cid->issuerKeyHash;
50    if (pserial)
51        *pserial = &cid->serialNumber;
52    return 1;
53}
54
55int OCSP_request_is_signed(OCSP_REQUEST *req)
56{
57    if (req->optionalSignature)
58        return 1;
59    return 0;
60}
61
62/* Create an OCSP response and encode an optional basic response */
63OCSP_RESPONSE *OCSP_response_create(int status, OCSP_BASICRESP *bs)
64{
65    OCSP_RESPONSE *rsp = NULL;
66
67    if ((rsp = OCSP_RESPONSE_new()) == NULL)
68        goto err;
69    if (!(ASN1_ENUMERATED_set(rsp->responseStatus, status)))
70        goto err;
71    if (!bs)
72        return rsp;
73    if ((rsp->responseBytes = OCSP_RESPBYTES_new()) == NULL)
74        goto err;
75    rsp->responseBytes->responseType = OBJ_nid2obj(NID_id_pkix_OCSP_basic);
76    if (!ASN1_item_pack
77        (bs, ASN1_ITEM_rptr(OCSP_BASICRESP), &rsp->responseBytes->response))
78         goto err;
79    return rsp;
80 err:
81    OCSP_RESPONSE_free(rsp);
82    return NULL;
83}
84
85OCSP_SINGLERESP *OCSP_basic_add1_status(OCSP_BASICRESP *rsp,
86                                        OCSP_CERTID *cid,
87                                        int status, int reason,
88                                        ASN1_TIME *revtime,
89                                        ASN1_TIME *thisupd,
90                                        ASN1_TIME *nextupd)
91{
92    OCSP_SINGLERESP *single = NULL;
93    OCSP_CERTSTATUS *cs;
94    OCSP_REVOKEDINFO *ri;
95
96    if (rsp->tbsResponseData.responses == NULL
97        && (rsp->tbsResponseData.responses
98                = sk_OCSP_SINGLERESP_new_null()) == NULL)
99        goto err;
100
101    if ((single = OCSP_SINGLERESP_new()) == NULL)
102        goto err;
103
104    if (!ASN1_TIME_to_generalizedtime(thisupd, &single->thisUpdate))
105        goto err;
106    if (nextupd &&
107        !ASN1_TIME_to_generalizedtime(nextupd, &single->nextUpdate))
108        goto err;
109
110    OCSP_CERTID_free(single->certId);
111
112    if ((single->certId = OCSP_CERTID_dup(cid)) == NULL)
113        goto err;
114
115    cs = single->certStatus;
116    switch (cs->type = status) {
117    case V_OCSP_CERTSTATUS_REVOKED:
118        if (!revtime) {
119            ERR_raise(ERR_LIB_OCSP, OCSP_R_NO_REVOKED_TIME);
120            goto err;
121        }
122        if ((cs->value.revoked = ri = OCSP_REVOKEDINFO_new()) == NULL)
123            goto err;
124        if (!ASN1_TIME_to_generalizedtime(revtime, &ri->revocationTime))
125            goto err;
126        if (reason != OCSP_REVOKED_STATUS_NOSTATUS) {
127            if ((ri->revocationReason = ASN1_ENUMERATED_new()) == NULL)
128                goto err;
129            if (!(ASN1_ENUMERATED_set(ri->revocationReason, reason)))
130                goto err;
131        }
132        break;
133
134    case V_OCSP_CERTSTATUS_GOOD:
135        if ((cs->value.good = ASN1_NULL_new()) == NULL)
136            goto err;
137        break;
138
139    case V_OCSP_CERTSTATUS_UNKNOWN:
140        if ((cs->value.unknown = ASN1_NULL_new()) == NULL)
141            goto err;
142        break;
143
144    default:
145        goto err;
146
147    }
148    if (!(sk_OCSP_SINGLERESP_push(rsp->tbsResponseData.responses, single)))
149        goto err;
150    return single;
151 err:
152    OCSP_SINGLERESP_free(single);
153    return NULL;
154}
155
156/* Add a certificate to an OCSP request */
157int OCSP_basic_add1_cert(OCSP_BASICRESP *resp, X509 *cert)
158{
159    return ossl_x509_add_cert_new(&resp->certs, cert, X509_ADD_FLAG_UP_REF);
160}
161
162/*
163 * Sign an OCSP response using the parameters contained in the digest context,
164 * set the responderID to the subject name in the signer's certificate, and
165 * include one or more optional certificates in the response.
166 */
167int OCSP_basic_sign_ctx(OCSP_BASICRESP *brsp,
168                    X509 *signer, EVP_MD_CTX *ctx,
169                    STACK_OF(X509) *certs, unsigned long flags)
170{
171    OCSP_RESPID *rid;
172    EVP_PKEY *pkey;
173
174    if (ctx == NULL || EVP_MD_CTX_get_pkey_ctx(ctx) == NULL) {
175        ERR_raise(ERR_LIB_OCSP, OCSP_R_NO_SIGNER_KEY);
176        goto err;
177    }
178
179    pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_get_pkey_ctx(ctx));
180    if (pkey == NULL || !X509_check_private_key(signer, pkey)) {
181        ERR_raise(ERR_LIB_OCSP, OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
182        goto err;
183    }
184
185    if (!(flags & OCSP_NOCERTS)) {
186        if (!OCSP_basic_add1_cert(brsp, signer)
187            || !X509_add_certs(brsp->certs, certs, X509_ADD_FLAG_UP_REF))
188            goto err;
189    }
190
191    rid = &brsp->tbsResponseData.responderId;
192    if (flags & OCSP_RESPID_KEY) {
193        if (!OCSP_RESPID_set_by_key(rid, signer))
194            goto err;
195    } else if (!OCSP_RESPID_set_by_name(rid, signer)) {
196        goto err;
197    }
198
199    if (!(flags & OCSP_NOTIME) &&
200        !X509_gmtime_adj(brsp->tbsResponseData.producedAt, 0))
201        goto err;
202
203    /*
204     * Right now, I think that not doing double hashing is the right thing.
205     * -- Richard Levitte
206     */
207    if (!OCSP_BASICRESP_sign_ctx(brsp, ctx, 0))
208        goto err;
209
210    return 1;
211 err:
212    return 0;
213}
214
215int OCSP_basic_sign(OCSP_BASICRESP *brsp,
216                    X509 *signer, EVP_PKEY *key, const EVP_MD *dgst,
217                    STACK_OF(X509) *certs, unsigned long flags)
218{
219    EVP_MD_CTX *ctx = EVP_MD_CTX_new();
220    EVP_PKEY_CTX *pkctx = NULL;
221    int i;
222
223    if (ctx == NULL)
224        return 0;
225
226    if (!EVP_DigestSignInit_ex(ctx, &pkctx, EVP_MD_get0_name(dgst),
227                               signer->libctx, signer->propq, key, NULL)) {
228        EVP_MD_CTX_free(ctx);
229        return 0;
230    }
231    i = OCSP_basic_sign_ctx(brsp, signer, ctx, certs, flags);
232    EVP_MD_CTX_free(ctx);
233    return i;
234}
235
236int OCSP_RESPID_set_by_name(OCSP_RESPID *respid, X509 *cert)
237{
238    if (!X509_NAME_set(&respid->value.byName, X509_get_subject_name(cert)))
239        return 0;
240
241    respid->type = V_OCSP_RESPID_NAME;
242
243    return 1;
244}
245
246int OCSP_RESPID_set_by_key_ex(OCSP_RESPID *respid, X509 *cert,
247                              OSSL_LIB_CTX *libctx, const char *propq)
248{
249    ASN1_OCTET_STRING *byKey = NULL;
250    unsigned char md[SHA_DIGEST_LENGTH];
251    EVP_MD *sha1 = EVP_MD_fetch(libctx, "SHA1", propq);
252    int ret = 0;
253
254    if (sha1 == NULL)
255        return 0;
256
257    /* RFC2560 requires SHA1 */
258    if (!X509_pubkey_digest(cert, sha1, md, NULL))
259        goto err;
260
261    byKey = ASN1_OCTET_STRING_new();
262    if (byKey == NULL)
263        goto err;
264
265    if (!(ASN1_OCTET_STRING_set(byKey, md, SHA_DIGEST_LENGTH))) {
266        ASN1_OCTET_STRING_free(byKey);
267        goto err;
268    }
269
270    respid->type = V_OCSP_RESPID_KEY;
271    respid->value.byKey = byKey;
272
273    ret = 1;
274 err:
275    EVP_MD_free(sha1);
276    return ret;
277}
278
279int OCSP_RESPID_set_by_key(OCSP_RESPID *respid, X509 *cert)
280{
281    if (cert == NULL)
282        return 0;
283    return OCSP_RESPID_set_by_key_ex(respid, cert, cert->libctx, cert->propq);
284}
285
286int OCSP_RESPID_match_ex(OCSP_RESPID *respid, X509 *cert, OSSL_LIB_CTX *libctx,
287                         const char *propq)
288{
289    EVP_MD *sha1 = NULL;
290    int ret = 0;
291
292    if (respid->type == V_OCSP_RESPID_KEY) {
293        unsigned char md[SHA_DIGEST_LENGTH];
294
295        sha1 = EVP_MD_fetch(libctx, "SHA1", propq);
296        if (sha1 == NULL)
297            goto err;
298
299        if (respid->value.byKey == NULL)
300            goto err;
301
302        /* RFC2560 requires SHA1 */
303        if (!X509_pubkey_digest(cert, sha1, md, NULL))
304            goto err;
305
306        ret = (ASN1_STRING_length(respid->value.byKey) == SHA_DIGEST_LENGTH)
307              && (memcmp(ASN1_STRING_get0_data(respid->value.byKey), md,
308                         SHA_DIGEST_LENGTH) == 0);
309    } else if (respid->type == V_OCSP_RESPID_NAME) {
310        if (respid->value.byName == NULL)
311            return 0;
312
313        return X509_NAME_cmp(respid->value.byName,
314                             X509_get_subject_name(cert)) == 0;
315    }
316
317 err:
318    EVP_MD_free(sha1);
319    return ret;
320}
321
322int OCSP_RESPID_match(OCSP_RESPID *respid, X509 *cert)
323{
324    if (cert == NULL)
325        return 0;
326    return OCSP_RESPID_match_ex(respid, cert, cert->libctx, cert->propq);
327}
328