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0f113f3e | 1 | /* |
ba4356ae | 2 | * Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved. |
c7235be6 | 3 | * |
4f22f405 RS |
4 | * Licensed under the OpenSSL license (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 | |
c7235be6 UM |
8 | */ |
9 | ||
10 | #include <stdio.h> | |
b39fc560 | 11 | #include "internal/cryptlib.h" |
c7235be6 UM |
12 | #include <openssl/objects.h> |
13 | #include <openssl/ts.h> | |
14 | #include <openssl/pkcs7.h> | |
b5acbf91 | 15 | #include "ts_local.h" |
c7235be6 | 16 | |
9c422b5b | 17 | static int ts_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted, |
0f113f3e | 18 | X509 *signer, STACK_OF(X509) **chain); |
9c422b5b | 19 | static int ts_check_signing_certs(PKCS7_SIGNER_INFO *si, |
0f113f3e | 20 | STACK_OF(X509) *chain); |
9c422b5b RS |
21 | static ESS_SIGNING_CERT *ess_get_signing_cert(PKCS7_SIGNER_INFO *si); |
22 | static int ts_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert); | |
a8d8e06b | 23 | static int ts_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509 *cert); |
9c422b5b | 24 | static int int_ts_RESP_verify_token(TS_VERIFY_CTX *ctx, |
0f113f3e | 25 | PKCS7 *token, TS_TST_INFO *tst_info); |
9c422b5b RS |
26 | static int ts_check_status_info(TS_RESP *response); |
27 | static char *ts_get_status_text(STACK_OF(ASN1_UTF8STRING) *text); | |
c47ba4e9 F |
28 | static int ts_check_policy(const ASN1_OBJECT *req_oid, |
29 | const TS_TST_INFO *tst_info); | |
9c422b5b | 30 | static int ts_compute_imprint(BIO *data, TS_TST_INFO *tst_info, |
0f113f3e MC |
31 | X509_ALGOR **md_alg, |
32 | unsigned char **imprint, unsigned *imprint_len); | |
9c422b5b | 33 | static int ts_check_imprints(X509_ALGOR *algor_a, |
c47ba4e9 | 34 | const unsigned char *imprint_a, unsigned len_a, |
0f113f3e | 35 | TS_TST_INFO *tst_info); |
9c422b5b RS |
36 | static int ts_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info); |
37 | static int ts_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer); | |
38 | static int ts_find_name(STACK_OF(GENERAL_NAME) *gen_names, | |
0f113f3e | 39 | GENERAL_NAME *name); |
f0ef20bf MK |
40 | static int ts_find_cert_v2(STACK_OF(ESS_CERT_ID_V2) *cert_ids, X509 *cert); |
41 | static ESS_SIGNING_CERT_V2 *ess_get_signing_cert_v2(PKCS7_SIGNER_INFO *si); | |
c7235be6 | 42 | |
0704343f GP |
43 | /* |
44 | * This must be large enough to hold all values in ts_status_text (with | |
45 | * comma separator) or all text fields in ts_failure_info (also with comma). | |
46 | */ | |
47 | #define TS_STATUS_BUF_SIZE 256 | |
48 | ||
c7235be6 UM |
49 | /* |
50 | * Local mapping between response codes and descriptions. | |
c7235be6 | 51 | */ |
0704343f GP |
52 | static const char *ts_status_text[] = { |
53 | "granted", | |
0f113f3e MC |
54 | "grantedWithMods", |
55 | "rejection", | |
56 | "waiting", | |
57 | "revocationWarning", | |
58 | "revocationNotification" | |
59 | }; | |
c7235be6 | 60 | |
9c422b5b | 61 | #define TS_STATUS_TEXT_SIZE OSSL_NELEM(ts_status_text) |
c7235be6 | 62 | |
0f113f3e MC |
63 | static struct { |
64 | int code; | |
65 | const char *text; | |
9c422b5b RS |
66 | } ts_failure_info[] = { |
67 | {TS_INFO_BAD_ALG, "badAlg"}, | |
68 | {TS_INFO_BAD_REQUEST, "badRequest"}, | |
69 | {TS_INFO_BAD_DATA_FORMAT, "badDataFormat"}, | |
70 | {TS_INFO_TIME_NOT_AVAILABLE, "timeNotAvailable"}, | |
71 | {TS_INFO_UNACCEPTED_POLICY, "unacceptedPolicy"}, | |
72 | {TS_INFO_UNACCEPTED_EXTENSION, "unacceptedExtension"}, | |
73 | {TS_INFO_ADD_INFO_NOT_AVAILABLE, "addInfoNotAvailable"}, | |
74 | {TS_INFO_SYSTEM_FAILURE, "systemFailure"} | |
0f113f3e MC |
75 | }; |
76 | ||
c7235be6 | 77 | |
c80fd6b2 | 78 | /*- |
c7235be6 | 79 | * This function carries out the following tasks: |
0f113f3e MC |
80 | * - Checks if there is one and only one signer. |
81 | * - Search for the signing certificate in 'certs' and in the response. | |
82 | * - Check the extended key usage and key usage fields of the signer | |
83 | * certificate (done by the path validation). | |
84 | * - Build and validate the certificate path. | |
85 | * - Check if the certificate path meets the requirements of the | |
86 | * SigningCertificate ESS signed attribute. | |
87 | * - Verify the signature value. | |
88 | * - Returns the signer certificate in 'signer', if 'signer' is not NULL. | |
c7235be6 UM |
89 | */ |
90 | int TS_RESP_verify_signature(PKCS7 *token, STACK_OF(X509) *certs, | |
0f113f3e MC |
91 | X509_STORE *store, X509 **signer_out) |
92 | { | |
93 | STACK_OF(PKCS7_SIGNER_INFO) *sinfos = NULL; | |
94 | PKCS7_SIGNER_INFO *si; | |
95 | STACK_OF(X509) *signers = NULL; | |
96 | X509 *signer; | |
97 | STACK_OF(X509) *chain = NULL; | |
98 | char buf[4096]; | |
99 | int i, j = 0, ret = 0; | |
100 | BIO *p7bio = NULL; | |
101 | ||
102 | /* Some sanity checks first. */ | |
103 | if (!token) { | |
104 | TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_INVALID_NULL_POINTER); | |
105 | goto err; | |
106 | } | |
0f113f3e MC |
107 | if (!PKCS7_type_is_signed(token)) { |
108 | TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_WRONG_CONTENT_TYPE); | |
109 | goto err; | |
110 | } | |
0f113f3e MC |
111 | sinfos = PKCS7_get_signer_info(token); |
112 | if (!sinfos || sk_PKCS7_SIGNER_INFO_num(sinfos) != 1) { | |
113 | TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_THERE_MUST_BE_ONE_SIGNER); | |
114 | goto err; | |
115 | } | |
116 | si = sk_PKCS7_SIGNER_INFO_value(sinfos, 0); | |
0f113f3e MC |
117 | if (PKCS7_get_detached(token)) { |
118 | TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_NO_CONTENT); | |
119 | goto err; | |
120 | } | |
121 | ||
122 | /* | |
123 | * Get hold of the signer certificate, search only internal certificates | |
124 | * if it was requested. | |
125 | */ | |
126 | signers = PKCS7_get0_signers(token, certs, 0); | |
127 | if (!signers || sk_X509_num(signers) != 1) | |
128 | goto err; | |
129 | signer = sk_X509_value(signers, 0); | |
130 | ||
9c422b5b | 131 | if (!ts_verify_cert(store, certs, signer, &chain)) |
0f113f3e | 132 | goto err; |
9c422b5b | 133 | if (!ts_check_signing_certs(si, chain)) |
0f113f3e | 134 | goto err; |
0f113f3e MC |
135 | p7bio = PKCS7_dataInit(token, NULL); |
136 | ||
137 | /* We now have to 'read' from p7bio to calculate digests etc. */ | |
18cd23df RS |
138 | while ((i = BIO_read(p7bio, buf, sizeof(buf))) > 0) |
139 | continue; | |
0f113f3e | 140 | |
0f113f3e MC |
141 | j = PKCS7_signatureVerify(p7bio, token, si, signer); |
142 | if (j <= 0) { | |
143 | TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_SIGNATURE_FAILURE); | |
144 | goto err; | |
145 | } | |
146 | ||
0f113f3e MC |
147 | if (signer_out) { |
148 | *signer_out = signer; | |
05f0fb9f | 149 | X509_up_ref(signer); |
0f113f3e | 150 | } |
0f113f3e | 151 | ret = 1; |
c7235be6 UM |
152 | |
153 | err: | |
0f113f3e MC |
154 | BIO_free_all(p7bio); |
155 | sk_X509_pop_free(chain, X509_free); | |
156 | sk_X509_free(signers); | |
c7235be6 | 157 | |
0f113f3e MC |
158 | return ret; |
159 | } | |
c7235be6 UM |
160 | |
161 | /* | |
162 | * The certificate chain is returned in chain. Caller is responsible for | |
163 | * freeing the vector. | |
164 | */ | |
9c422b5b | 165 | static int ts_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted, |
0f113f3e MC |
166 | X509 *signer, STACK_OF(X509) **chain) |
167 | { | |
f0e0fd51 | 168 | X509_STORE_CTX *cert_ctx = NULL; |
0f113f3e | 169 | int i; |
f0e0fd51 | 170 | int ret = 0; |
0f113f3e | 171 | |
0f113f3e | 172 | *chain = NULL; |
f0e0fd51 RS |
173 | cert_ctx = X509_STORE_CTX_new(); |
174 | if (cert_ctx == NULL) { | |
175 | TSerr(TS_F_TS_VERIFY_CERT, ERR_R_MALLOC_FAILURE); | |
176 | goto err; | |
177 | } | |
178 | if (!X509_STORE_CTX_init(cert_ctx, store, signer, untrusted)) | |
179 | goto end; | |
180 | X509_STORE_CTX_set_purpose(cert_ctx, X509_PURPOSE_TIMESTAMP_SIGN); | |
181 | i = X509_verify_cert(cert_ctx); | |
0f113f3e | 182 | if (i <= 0) { |
f0e0fd51 | 183 | int j = X509_STORE_CTX_get_error(cert_ctx); |
0f113f3e MC |
184 | TSerr(TS_F_TS_VERIFY_CERT, TS_R_CERTIFICATE_VERIFY_ERROR); |
185 | ERR_add_error_data(2, "Verify error:", | |
186 | X509_verify_cert_error_string(j)); | |
f0e0fd51 | 187 | goto err; |
0f113f3e | 188 | } |
f0e0fd51 RS |
189 | *chain = X509_STORE_CTX_get1_chain(cert_ctx); |
190 | ret = 1; | |
191 | goto end; | |
0f113f3e | 192 | |
f0e0fd51 RS |
193 | err: |
194 | ret = 0; | |
0f113f3e | 195 | |
f0e0fd51 RS |
196 | end: |
197 | X509_STORE_CTX_free(cert_ctx); | |
0f113f3e MC |
198 | return ret; |
199 | } | |
200 | ||
9c422b5b | 201 | static int ts_check_signing_certs(PKCS7_SIGNER_INFO *si, |
0f113f3e MC |
202 | STACK_OF(X509) *chain) |
203 | { | |
9c422b5b | 204 | ESS_SIGNING_CERT *ss = ess_get_signing_cert(si); |
0f113f3e | 205 | STACK_OF(ESS_CERT_ID) *cert_ids = NULL; |
f0ef20bf MK |
206 | ESS_SIGNING_CERT_V2 *ssv2 = ess_get_signing_cert_v2(si); |
207 | STACK_OF(ESS_CERT_ID_V2) *cert_ids_v2 = NULL; | |
0f113f3e MC |
208 | X509 *cert; |
209 | int i = 0; | |
210 | int ret = 0; | |
211 | ||
f0ef20bf MK |
212 | if (ss != NULL) { |
213 | cert_ids = ss->cert_ids; | |
214 | cert = sk_X509_value(chain, 0); | |
215 | if (ts_find_cert(cert_ids, cert) != 0) | |
216 | goto err; | |
0f113f3e | 217 | |
f0ef20bf MK |
218 | /* |
219 | * Check the other certificates of the chain if there are more than one | |
220 | * certificate ids in cert_ids. | |
221 | */ | |
222 | if (sk_ESS_CERT_ID_num(cert_ids) > 1) { | |
223 | for (i = 1; i < sk_X509_num(chain); ++i) { | |
224 | cert = sk_X509_value(chain, i); | |
225 | if (ts_find_cert(cert_ids, cert) < 0) | |
226 | goto err; | |
227 | } | |
0f113f3e | 228 | } |
f0ef20bf MK |
229 | } else if (ssv2 != NULL) { |
230 | cert_ids_v2 = ssv2->cert_ids; | |
231 | cert = sk_X509_value(chain, 0); | |
232 | if (ts_find_cert_v2(cert_ids_v2, cert) != 0) | |
233 | goto err; | |
234 | ||
235 | /* | |
236 | * Check the other certificates of the chain if there are more than one | |
237 | * certificate ids in cert_ids. | |
238 | */ | |
239 | if (sk_ESS_CERT_ID_V2_num(cert_ids_v2) > 1) { | |
240 | for (i = 1; i < sk_X509_num(chain); ++i) { | |
241 | cert = sk_X509_value(chain, i); | |
242 | if (ts_find_cert_v2(cert_ids_v2, cert) < 0) | |
243 | goto err; | |
244 | } | |
245 | } | |
246 | } else { | |
247 | goto err; | |
0f113f3e | 248 | } |
f0ef20bf | 249 | |
0f113f3e | 250 | ret = 1; |
c7235be6 | 251 | err: |
0f113f3e MC |
252 | if (!ret) |
253 | TSerr(TS_F_TS_CHECK_SIGNING_CERTS, | |
254 | TS_R_ESS_SIGNING_CERTIFICATE_ERROR); | |
255 | ESS_SIGNING_CERT_free(ss); | |
f0ef20bf | 256 | ESS_SIGNING_CERT_V2_free(ssv2); |
0f113f3e MC |
257 | return ret; |
258 | } | |
c7235be6 | 259 | |
9c422b5b | 260 | static ESS_SIGNING_CERT *ess_get_signing_cert(PKCS7_SIGNER_INFO *si) |
0f113f3e MC |
261 | { |
262 | ASN1_TYPE *attr; | |
263 | const unsigned char *p; | |
264 | attr = PKCS7_get_signed_attribute(si, NID_id_smime_aa_signingCertificate); | |
265 | if (!attr) | |
266 | return NULL; | |
267 | p = attr->value.sequence->data; | |
268 | return d2i_ESS_SIGNING_CERT(NULL, &p, attr->value.sequence->length); | |
269 | } | |
c7235be6 | 270 | |
f0ef20bf MK |
271 | static ESS_SIGNING_CERT_V2 *ess_get_signing_cert_v2(PKCS7_SIGNER_INFO *si) |
272 | { | |
273 | ASN1_TYPE *attr; | |
274 | const unsigned char *p; | |
275 | ||
276 | attr = PKCS7_get_signed_attribute(si, NID_id_smime_aa_signingCertificateV2); | |
277 | if (attr == NULL) | |
278 | return NULL; | |
279 | p = attr->value.sequence->data; | |
280 | return d2i_ESS_SIGNING_CERT_V2(NULL, &p, attr->value.sequence->length); | |
281 | } | |
282 | ||
c7235be6 | 283 | /* Returns < 0 if certificate is not found, certificate index otherwise. */ |
9c422b5b | 284 | static int ts_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert) |
0f113f3e MC |
285 | { |
286 | int i; | |
7e418832 | 287 | unsigned char cert_sha1[SHA_DIGEST_LENGTH]; |
0f113f3e MC |
288 | |
289 | if (!cert_ids || !cert) | |
290 | return -1; | |
291 | ||
292 | /* Recompute SHA1 hash of certificate if necessary (side effect). */ | |
293 | X509_check_purpose(cert, -1, 0); | |
294 | ||
ba4356ae BE |
295 | if (!X509_digest(cert, EVP_sha1(), cert_sha1, NULL)) |
296 | return -1; | |
297 | ||
0f113f3e MC |
298 | /* Look for cert in the cert_ids vector. */ |
299 | for (i = 0; i < sk_ESS_CERT_ID_num(cert_ids); ++i) { | |
300 | ESS_CERT_ID *cid = sk_ESS_CERT_ID_value(cert_ids, i); | |
301 | ||
7e418832 DSH |
302 | if (cid->hash->length == SHA_DIGEST_LENGTH |
303 | && memcmp(cid->hash->data, cert_sha1, SHA_DIGEST_LENGTH) == 0) { | |
0f113f3e | 304 | ESS_ISSUER_SERIAL *is = cid->issuer_serial; |
a8d8e06b | 305 | if (!is || !ts_issuer_serial_cmp(is, cert)) |
0f113f3e MC |
306 | return i; |
307 | } | |
308 | } | |
f0ef20bf MK |
309 | |
310 | return -1; | |
311 | } | |
312 | ||
313 | /* Returns < 0 if certificate is not found, certificate index otherwise. */ | |
314 | static int ts_find_cert_v2(STACK_OF(ESS_CERT_ID_V2) *cert_ids, X509 *cert) | |
315 | { | |
316 | int i; | |
317 | unsigned char cert_digest[EVP_MAX_MD_SIZE]; | |
318 | unsigned int len; | |
319 | ||
320 | /* Look for cert in the cert_ids vector. */ | |
321 | for (i = 0; i < sk_ESS_CERT_ID_V2_num(cert_ids); ++i) { | |
322 | ESS_CERT_ID_V2 *cid = sk_ESS_CERT_ID_V2_value(cert_ids, i); | |
323 | const EVP_MD *md; | |
324 | ||
325 | if (cid->hash_alg != NULL) | |
326 | md = EVP_get_digestbyobj(cid->hash_alg->algorithm); | |
327 | else | |
328 | md = EVP_sha256(); | |
329 | ||
ba4356ae BE |
330 | if (!X509_digest(cert, md, cert_digest, &len)) |
331 | return -1; | |
f0ef20bf MK |
332 | if (cid->hash->length != (int)len) |
333 | return -1; | |
334 | ||
335 | if (memcmp(cid->hash->data, cert_digest, cid->hash->length) == 0) { | |
336 | ESS_ISSUER_SERIAL *is = cid->issuer_serial; | |
337 | ||
338 | if (is == NULL || !ts_issuer_serial_cmp(is, cert)) | |
339 | return i; | |
340 | } | |
341 | } | |
0f113f3e MC |
342 | |
343 | return -1; | |
344 | } | |
c7235be6 | 345 | |
a8d8e06b | 346 | static int ts_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509 *cert) |
0f113f3e MC |
347 | { |
348 | GENERAL_NAME *issuer; | |
c7235be6 | 349 | |
a8d8e06b | 350 | if (!is || !cert || sk_GENERAL_NAME_num(is->issuer) != 1) |
0f113f3e | 351 | return -1; |
c7235be6 | 352 | |
0f113f3e MC |
353 | issuer = sk_GENERAL_NAME_value(is->issuer, 0); |
354 | if (issuer->type != GEN_DIRNAME | |
a8d8e06b | 355 | || X509_NAME_cmp(issuer->d.dirn, X509_get_issuer_name(cert))) |
0f113f3e | 356 | return -1; |
c7235be6 | 357 | |
a8d8e06b | 358 | if (ASN1_INTEGER_cmp(is->serial, X509_get_serialNumber(cert))) |
0f113f3e | 359 | return -1; |
c7235be6 | 360 | |
0f113f3e MC |
361 | return 0; |
362 | } | |
c7235be6 | 363 | |
c80fd6b2 | 364 | /*- |
0f113f3e | 365 | * Verifies whether 'response' contains a valid response with regards |
c7235be6 | 366 | * to the settings of the context: |
0f113f3e MC |
367 | * - Gives an error message if the TS_TST_INFO is not present. |
368 | * - Calls _TS_RESP_verify_token to verify the token content. | |
c7235be6 UM |
369 | */ |
370 | int TS_RESP_verify_response(TS_VERIFY_CTX *ctx, TS_RESP *response) | |
0f113f3e | 371 | { |
ca4a494c RS |
372 | PKCS7 *token = response->token; |
373 | TS_TST_INFO *tst_info = response->tst_info; | |
0f113f3e | 374 | int ret = 0; |
c7235be6 | 375 | |
9c422b5b | 376 | if (!ts_check_status_info(response)) |
0f113f3e | 377 | goto err; |
9c422b5b | 378 | if (!int_ts_RESP_verify_token(ctx, token, tst_info)) |
0f113f3e | 379 | goto err; |
0f113f3e | 380 | ret = 1; |
18cd23df | 381 | |
c7235be6 | 382 | err: |
0f113f3e MC |
383 | return ret; |
384 | } | |
c7235be6 UM |
385 | |
386 | /* | |
387 | * Tries to extract a TS_TST_INFO structure from the PKCS7 token and | |
a291745e | 388 | * calls the internal int_TS_RESP_verify_token function for verifying it. |
c7235be6 UM |
389 | */ |
390 | int TS_RESP_verify_token(TS_VERIFY_CTX *ctx, PKCS7 *token) | |
0f113f3e MC |
391 | { |
392 | TS_TST_INFO *tst_info = PKCS7_to_TS_TST_INFO(token); | |
393 | int ret = 0; | |
394 | if (tst_info) { | |
9c422b5b | 395 | ret = int_ts_RESP_verify_token(ctx, token, tst_info); |
0f113f3e MC |
396 | TS_TST_INFO_free(tst_info); |
397 | } | |
398 | return ret; | |
399 | } | |
c7235be6 | 400 | |
1d97c843 | 401 | /*- |
0f113f3e | 402 | * Verifies whether the 'token' contains a valid time stamp token |
c7235be6 UM |
403 | * with regards to the settings of the context. Only those checks are |
404 | * carried out that are specified in the context: | |
0f113f3e MC |
405 | * - Verifies the signature of the TS_TST_INFO. |
406 | * - Checks the version number of the response. | |
407 | * - Check if the requested and returned policies math. | |
408 | * - Check if the message imprints are the same. | |
409 | * - Check if the nonces are the same. | |
410 | * - Check if the TSA name matches the signer. | |
411 | * - Check if the TSA name is the expected TSA. | |
c7235be6 | 412 | */ |
9c422b5b | 413 | static int int_ts_RESP_verify_token(TS_VERIFY_CTX *ctx, |
0f113f3e MC |
414 | PKCS7 *token, TS_TST_INFO *tst_info) |
415 | { | |
416 | X509 *signer = NULL; | |
ca4a494c | 417 | GENERAL_NAME *tsa_name = tst_info->tsa; |
0f113f3e MC |
418 | X509_ALGOR *md_alg = NULL; |
419 | unsigned char *imprint = NULL; | |
420 | unsigned imprint_len = 0; | |
421 | int ret = 0; | |
e68a780e | 422 | int flags = ctx->flags; |
0f113f3e | 423 | |
e68a780e MC |
424 | /* Some options require us to also check the signature */ |
425 | if (((flags & TS_VFY_SIGNER) && tsa_name != NULL) | |
426 | || (flags & TS_VFY_TSA_NAME)) { | |
427 | flags |= TS_VFY_SIGNATURE; | |
428 | } | |
429 | ||
430 | if ((flags & TS_VFY_SIGNATURE) | |
0f113f3e MC |
431 | && !TS_RESP_verify_signature(token, ctx->certs, ctx->store, &signer)) |
432 | goto err; | |
e68a780e | 433 | if ((flags & TS_VFY_VERSION) |
0f113f3e MC |
434 | && TS_TST_INFO_get_version(tst_info) != 1) { |
435 | TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_UNSUPPORTED_VERSION); | |
436 | goto err; | |
437 | } | |
e68a780e | 438 | if ((flags & TS_VFY_POLICY) |
9c422b5b | 439 | && !ts_check_policy(ctx->policy, tst_info)) |
0f113f3e | 440 | goto err; |
e68a780e | 441 | if ((flags & TS_VFY_IMPRINT) |
9c422b5b | 442 | && !ts_check_imprints(ctx->md_alg, ctx->imprint, ctx->imprint_len, |
0f113f3e MC |
443 | tst_info)) |
444 | goto err; | |
e68a780e | 445 | if ((flags & TS_VFY_DATA) |
9c422b5b | 446 | && (!ts_compute_imprint(ctx->data, tst_info, |
0f113f3e | 447 | &md_alg, &imprint, &imprint_len) |
9c422b5b | 448 | || !ts_check_imprints(md_alg, imprint, imprint_len, tst_info))) |
0f113f3e | 449 | goto err; |
e68a780e | 450 | if ((flags & TS_VFY_NONCE) |
9c422b5b | 451 | && !ts_check_nonces(ctx->nonce, tst_info)) |
0f113f3e | 452 | goto err; |
e68a780e | 453 | if ((flags & TS_VFY_SIGNER) |
9c422b5b | 454 | && tsa_name && !ts_check_signer_name(tsa_name, signer)) { |
0f113f3e MC |
455 | TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_NAME_MISMATCH); |
456 | goto err; | |
457 | } | |
e68a780e | 458 | if ((flags & TS_VFY_TSA_NAME) |
9c422b5b | 459 | && !ts_check_signer_name(ctx->tsa_name, signer)) { |
0f113f3e MC |
460 | TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_UNTRUSTED); |
461 | goto err; | |
462 | } | |
0f113f3e | 463 | ret = 1; |
18cd23df | 464 | |
c7235be6 | 465 | err: |
0f113f3e MC |
466 | X509_free(signer); |
467 | X509_ALGOR_free(md_alg); | |
468 | OPENSSL_free(imprint); | |
469 | return ret; | |
470 | } | |
c7235be6 | 471 | |
9c422b5b | 472 | static int ts_check_status_info(TS_RESP *response) |
0f113f3e | 473 | { |
ca4a494c | 474 | TS_STATUS_INFO *info = response->status_info; |
0f113f3e MC |
475 | long status = ASN1_INTEGER_get(info->status); |
476 | const char *status_text = NULL; | |
477 | char *embedded_status_text = NULL; | |
478 | char failure_text[TS_STATUS_BUF_SIZE] = ""; | |
479 | ||
0f113f3e MC |
480 | if (status == 0 || status == 1) |
481 | return 1; | |
482 | ||
483 | /* There was an error, get the description in status_text. */ | |
0704343f | 484 | if (0 <= status && status < (long) OSSL_NELEM(ts_status_text)) |
9c422b5b | 485 | status_text = ts_status_text[status]; |
0f113f3e MC |
486 | else |
487 | status_text = "unknown code"; | |
488 | ||
0f113f3e | 489 | if (sk_ASN1_UTF8STRING_num(info->text) > 0 |
9c422b5b | 490 | && (embedded_status_text = ts_get_status_text(info->text)) == NULL) |
0f113f3e MC |
491 | return 0; |
492 | ||
18cd23df | 493 | /* Fill in failure_text with the failure information. */ |
0f113f3e MC |
494 | if (info->failure_info) { |
495 | int i; | |
496 | int first = 1; | |
18cd23df | 497 | for (i = 0; i < (int)OSSL_NELEM(ts_failure_info); ++i) { |
0f113f3e | 498 | if (ASN1_BIT_STRING_get_bit(info->failure_info, |
9c422b5b | 499 | ts_failure_info[i].code)) { |
0f113f3e | 500 | if (!first) |
0704343f | 501 | strcat(failure_text, ","); |
0f113f3e MC |
502 | else |
503 | first = 0; | |
9c422b5b | 504 | strcat(failure_text, ts_failure_info[i].text); |
0f113f3e MC |
505 | } |
506 | } | |
507 | } | |
508 | if (failure_text[0] == '\0') | |
509 | strcpy(failure_text, "unspecified"); | |
510 | ||
0f113f3e MC |
511 | TSerr(TS_F_TS_CHECK_STATUS_INFO, TS_R_NO_TIME_STAMP_TOKEN); |
512 | ERR_add_error_data(6, | |
513 | "status code: ", status_text, | |
514 | ", status text: ", embedded_status_text ? | |
515 | embedded_status_text : "unspecified", | |
516 | ", failure codes: ", failure_text); | |
517 | OPENSSL_free(embedded_status_text); | |
518 | ||
519 | return 0; | |
520 | } | |
c7235be6 | 521 | |
9c422b5b | 522 | static char *ts_get_status_text(STACK_OF(ASN1_UTF8STRING) *text) |
0f113f3e MC |
523 | { |
524 | int i; | |
20fc103f | 525 | int length = 0; |
0f113f3e MC |
526 | char *result = NULL; |
527 | char *p; | |
528 | ||
0f113f3e MC |
529 | for (i = 0; i < sk_ASN1_UTF8STRING_num(text); ++i) { |
530 | ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i); | |
20fc103f DSH |
531 | if (ASN1_STRING_length(current) > TS_MAX_STATUS_LENGTH - length - 1) |
532 | return NULL; | |
0f113f3e MC |
533 | length += ASN1_STRING_length(current); |
534 | length += 1; /* separator character */ | |
535 | } | |
75ebbd9a | 536 | if ((result = OPENSSL_malloc(length)) == NULL) { |
0f113f3e MC |
537 | TSerr(TS_F_TS_GET_STATUS_TEXT, ERR_R_MALLOC_FAILURE); |
538 | return NULL; | |
539 | } | |
02e112a8 | 540 | |
0f113f3e MC |
541 | for (i = 0, p = result; i < sk_ASN1_UTF8STRING_num(text); ++i) { |
542 | ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i); | |
543 | length = ASN1_STRING_length(current); | |
544 | if (i > 0) | |
545 | *p++ = '/'; | |
17ebf85a | 546 | strncpy(p, (const char *)ASN1_STRING_get0_data(current), length); |
0f113f3e MC |
547 | p += length; |
548 | } | |
0f113f3e MC |
549 | *p = '\0'; |
550 | ||
551 | return result; | |
552 | } | |
c7235be6 | 553 | |
609b0852 | 554 | static int ts_check_policy(const ASN1_OBJECT *req_oid, |
c47ba4e9 | 555 | const TS_TST_INFO *tst_info) |
0f113f3e | 556 | { |
c47ba4e9 | 557 | const ASN1_OBJECT *resp_oid = tst_info->policy_id; |
c7235be6 | 558 | |
0f113f3e MC |
559 | if (OBJ_cmp(req_oid, resp_oid) != 0) { |
560 | TSerr(TS_F_TS_CHECK_POLICY, TS_R_POLICY_MISMATCH); | |
561 | return 0; | |
562 | } | |
c7235be6 | 563 | |
0f113f3e MC |
564 | return 1; |
565 | } | |
c7235be6 | 566 | |
9c422b5b | 567 | static int ts_compute_imprint(BIO *data, TS_TST_INFO *tst_info, |
0f113f3e MC |
568 | X509_ALGOR **md_alg, |
569 | unsigned char **imprint, unsigned *imprint_len) | |
570 | { | |
ca4a494c RS |
571 | TS_MSG_IMPRINT *msg_imprint = tst_info->msg_imprint; |
572 | X509_ALGOR *md_alg_resp = msg_imprint->hash_algo; | |
0f113f3e | 573 | const EVP_MD *md; |
6e59a892 | 574 | EVP_MD_CTX *md_ctx = NULL; |
0f113f3e MC |
575 | unsigned char buffer[4096]; |
576 | int length; | |
577 | ||
578 | *md_alg = NULL; | |
579 | *imprint = NULL; | |
580 | ||
75ebbd9a | 581 | if ((*md_alg = X509_ALGOR_dup(md_alg_resp)) == NULL) |
0f113f3e | 582 | goto err; |
75ebbd9a | 583 | if ((md = EVP_get_digestbyobj((*md_alg)->algorithm)) == NULL) { |
0f113f3e MC |
584 | TSerr(TS_F_TS_COMPUTE_IMPRINT, TS_R_UNSUPPORTED_MD_ALGORITHM); |
585 | goto err; | |
586 | } | |
0f113f3e MC |
587 | length = EVP_MD_size(md); |
588 | if (length < 0) | |
589 | goto err; | |
590 | *imprint_len = length; | |
75ebbd9a | 591 | if ((*imprint = OPENSSL_malloc(*imprint_len)) == NULL) { |
0f113f3e MC |
592 | TSerr(TS_F_TS_COMPUTE_IMPRINT, ERR_R_MALLOC_FAILURE); |
593 | goto err; | |
594 | } | |
595 | ||
bfb0641f | 596 | md_ctx = EVP_MD_CTX_new(); |
6e59a892 RL |
597 | if (md_ctx == NULL) { |
598 | TSerr(TS_F_TS_COMPUTE_IMPRINT, ERR_R_MALLOC_FAILURE); | |
599 | goto err; | |
600 | } | |
601 | if (!EVP_DigestInit(md_ctx, md)) | |
0f113f3e MC |
602 | goto err; |
603 | while ((length = BIO_read(data, buffer, sizeof(buffer))) > 0) { | |
6e59a892 | 604 | if (!EVP_DigestUpdate(md_ctx, buffer, length)) |
0f113f3e MC |
605 | goto err; |
606 | } | |
6e59a892 | 607 | if (!EVP_DigestFinal(md_ctx, *imprint, NULL)) |
0f113f3e | 608 | goto err; |
bfb0641f | 609 | EVP_MD_CTX_free(md_ctx); |
0f113f3e MC |
610 | |
611 | return 1; | |
c7235be6 | 612 | err: |
bfb0641f | 613 | EVP_MD_CTX_free(md_ctx); |
0f113f3e MC |
614 | X509_ALGOR_free(*md_alg); |
615 | OPENSSL_free(*imprint); | |
616 | *imprint_len = 0; | |
617 | *imprint = 0; | |
618 | return 0; | |
619 | } | |
620 | ||
9c422b5b | 621 | static int ts_check_imprints(X509_ALGOR *algor_a, |
c47ba4e9 | 622 | const unsigned char *imprint_a, unsigned len_a, |
0f113f3e MC |
623 | TS_TST_INFO *tst_info) |
624 | { | |
ca4a494c RS |
625 | TS_MSG_IMPRINT *b = tst_info->msg_imprint; |
626 | X509_ALGOR *algor_b = b->hash_algo; | |
0f113f3e MC |
627 | int ret = 0; |
628 | ||
0f113f3e | 629 | if (algor_a) { |
0f113f3e MC |
630 | if (OBJ_cmp(algor_a->algorithm, algor_b->algorithm)) |
631 | goto err; | |
632 | ||
633 | /* The parameter must be NULL in both. */ | |
634 | if ((algor_a->parameter | |
635 | && ASN1_TYPE_get(algor_a->parameter) != V_ASN1_NULL) | |
636 | || (algor_b->parameter | |
637 | && ASN1_TYPE_get(algor_b->parameter) != V_ASN1_NULL)) | |
638 | goto err; | |
639 | } | |
640 | ||
0f113f3e | 641 | ret = len_a == (unsigned)ASN1_STRING_length(b->hashed_msg) && |
17ebf85a | 642 | memcmp(imprint_a, ASN1_STRING_get0_data(b->hashed_msg), len_a) == 0; |
c7235be6 | 643 | err: |
0f113f3e MC |
644 | if (!ret) |
645 | TSerr(TS_F_TS_CHECK_IMPRINTS, TS_R_MESSAGE_IMPRINT_MISMATCH); | |
646 | return ret; | |
647 | } | |
c7235be6 | 648 | |
9c422b5b | 649 | static int ts_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info) |
0f113f3e | 650 | { |
ca4a494c | 651 | const ASN1_INTEGER *b = tst_info->nonce; |
0f113f3e | 652 | |
0f113f3e MC |
653 | if (!b) { |
654 | TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_NOT_RETURNED); | |
655 | return 0; | |
656 | } | |
657 | ||
658 | /* No error if a nonce is returned without being requested. */ | |
659 | if (ASN1_INTEGER_cmp(a, b) != 0) { | |
660 | TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_MISMATCH); | |
661 | return 0; | |
662 | } | |
663 | ||
664 | return 1; | |
665 | } | |
666 | ||
667 | /* | |
668 | * Check if the specified TSA name matches either the subject or one of the | |
669 | * subject alternative names of the TSA certificate. | |
670 | */ | |
9c422b5b | 671 | static int ts_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer) |
0f113f3e MC |
672 | { |
673 | STACK_OF(GENERAL_NAME) *gen_names = NULL; | |
674 | int idx = -1; | |
675 | int found = 0; | |
676 | ||
0f113f3e | 677 | if (tsa_name->type == GEN_DIRNAME |
a8d8e06b | 678 | && X509_name_cmp(tsa_name->d.dirn, X509_get_subject_name(signer)) == 0) |
0f113f3e | 679 | return 1; |
0f113f3e | 680 | gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name, NULL, &idx); |
75ebbd9a | 681 | while (gen_names != NULL) { |
9c422b5b | 682 | found = ts_find_name(gen_names, tsa_name) >= 0; |
75ebbd9a RS |
683 | if (found) |
684 | break; | |
0f113f3e MC |
685 | /* |
686 | * Get the next subject alternative name, although there should be no | |
687 | * more than one. | |
688 | */ | |
689 | GENERAL_NAMES_free(gen_names); | |
75ebbd9a | 690 | gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name, NULL, &idx); |
0f113f3e | 691 | } |
25aaa98a | 692 | GENERAL_NAMES_free(gen_names); |
0f113f3e MC |
693 | |
694 | return found; | |
695 | } | |
c7235be6 UM |
696 | |
697 | /* Returns 1 if name is in gen_names, 0 otherwise. */ | |
9c422b5b | 698 | static int ts_find_name(STACK_OF(GENERAL_NAME) *gen_names, GENERAL_NAME *name) |
0f113f3e MC |
699 | { |
700 | int i, found; | |
701 | for (i = 0, found = 0; !found && i < sk_GENERAL_NAME_num(gen_names); ++i) { | |
702 | GENERAL_NAME *current = sk_GENERAL_NAME_value(gen_names, i); | |
703 | found = GENERAL_NAME_cmp(current, name) == 0; | |
704 | } | |
705 | return found ? i - 1 : -1; | |
706 | } |