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b1322259 | 1 | /* |
7e06a675 | 2 | * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved. |
d02b48c6 | 3 | * |
3e4b43b9 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
b1322259 RS |
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 | |
d02b48c6 RE |
8 | */ |
9 | ||
10 | #include <stdio.h> | |
11 | #include <time.h> | |
12 | #include <errno.h> | |
d9b8b89b | 13 | #include <limits.h> |
d02b48c6 | 14 | |
25f2138b | 15 | #include "crypto/ctype.h" |
b39fc560 | 16 | #include "internal/cryptlib.h" |
17f389bb | 17 | #include <openssl/crypto.h> |
ec577822 BM |
18 | #include <openssl/buffer.h> |
19 | #include <openssl/evp.h> | |
20 | #include <openssl/asn1.h> | |
21 | #include <openssl/x509.h> | |
11262391 | 22 | #include <openssl/x509v3.h> |
ec577822 | 23 | #include <openssl/objects.h> |
176db6dc | 24 | #include "internal/dane.h" |
25f2138b | 25 | #include "crypto/x509.h" |
706457b7 | 26 | #include "x509_local.h" |
d02b48c6 | 27 | |
d43c4497 DSH |
28 | /* CRL score values */ |
29 | ||
30 | /* No unhandled critical extensions */ | |
31 | ||
0f113f3e | 32 | #define CRL_SCORE_NOCRITICAL 0x100 |
d43c4497 DSH |
33 | |
34 | /* certificate is within CRL scope */ | |
35 | ||
0f113f3e | 36 | #define CRL_SCORE_SCOPE 0x080 |
d43c4497 DSH |
37 | |
38 | /* CRL times valid */ | |
39 | ||
0f113f3e | 40 | #define CRL_SCORE_TIME 0x040 |
d43c4497 DSH |
41 | |
42 | /* Issuer name matches certificate */ | |
43 | ||
0f113f3e | 44 | #define CRL_SCORE_ISSUER_NAME 0x020 |
d43c4497 DSH |
45 | |
46 | /* If this score or above CRL is probably valid */ | |
47 | ||
48 | #define CRL_SCORE_VALID (CRL_SCORE_NOCRITICAL|CRL_SCORE_TIME|CRL_SCORE_SCOPE) | |
49 | ||
50 | /* CRL issuer is certificate issuer */ | |
51 | ||
0f113f3e | 52 | #define CRL_SCORE_ISSUER_CERT 0x018 |
d43c4497 DSH |
53 | |
54 | /* CRL issuer is on certificate path */ | |
55 | ||
0f113f3e | 56 | #define CRL_SCORE_SAME_PATH 0x008 |
d43c4497 DSH |
57 | |
58 | /* CRL issuer matches CRL AKID */ | |
59 | ||
0f113f3e | 60 | #define CRL_SCORE_AKID 0x004 |
d43c4497 DSH |
61 | |
62 | /* Have a delta CRL with valid times */ | |
63 | ||
0f113f3e | 64 | #define CRL_SCORE_TIME_DELTA 0x002 |
d43c4497 | 65 | |
d9b8b89b VD |
66 | static int build_chain(X509_STORE_CTX *ctx); |
67 | static int verify_chain(X509_STORE_CTX *ctx); | |
170b7358 | 68 | static int dane_verify(X509_STORE_CTX *ctx); |
0f113f3e | 69 | static int null_callback(int ok, X509_STORE_CTX *e); |
2f043896 DSH |
70 | static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer); |
71 | static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x); | |
67ecd65c | 72 | static int check_chain(X509_STORE_CTX *ctx); |
e9746e03 | 73 | static int check_name_constraints(X509_STORE_CTX *ctx); |
3bf15e29 | 74 | static int check_id(X509_STORE_CTX *ctx); |
d9b8b89b | 75 | static int check_trust(X509_STORE_CTX *ctx, int num_untrusted); |
b545dc67 DSH |
76 | static int check_revocation(X509_STORE_CTX *ctx); |
77 | static int check_cert(X509_STORE_CTX *ctx); | |
5d7c222d | 78 | static int check_policy(X509_STORE_CTX *ctx); |
c9a81b30 | 79 | static int get_issuer_sk(X509 **issuer, X509_STORE_CTX *ctx, X509 *x); |
170b7358 | 80 | static int check_dane_issuer(X509_STORE_CTX *ctx, int depth); |
fbb82a60 VD |
81 | static int check_key_level(X509_STORE_CTX *ctx, X509 *cert); |
82 | static int check_sig_level(X509_STORE_CTX *ctx, X509 *cert); | |
cccf532f | 83 | static int check_curve(X509 *cert); |
4b96839f DSH |
84 | |
85 | static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer, | |
0f113f3e | 86 | unsigned int *preasons, X509_CRL *crl, X509 *x); |
d43c4497 | 87 | static int get_crl_delta(X509_STORE_CTX *ctx, |
0f113f3e MC |
88 | X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x); |
89 | static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, | |
90 | int *pcrl_score, X509_CRL *base, | |
91 | STACK_OF(X509_CRL) *crls); | |
92 | static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl, X509 **pissuer, | |
93 | int *pcrl_score); | |
4b96839f | 94 | static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score, |
0f113f3e | 95 | unsigned int *preasons); |
9d84d4ed DSH |
96 | static int check_crl_path(X509_STORE_CTX *ctx, X509 *x); |
97 | static int check_crl_chain(X509_STORE_CTX *ctx, | |
0f113f3e MC |
98 | STACK_OF(X509) *cert_path, |
99 | STACK_OF(X509) *crl_path); | |
4b96839f | 100 | |
d02b48c6 | 101 | static int internal_verify(X509_STORE_CTX *ctx); |
d02b48c6 | 102 | |
6b691a5c | 103 | static int null_callback(int ok, X509_STORE_CTX *e) |
0f113f3e MC |
104 | { |
105 | return ok; | |
106 | } | |
d02b48c6 | 107 | |
0d8dbb52 | 108 | /*- |
ade08735 | 109 | * Return 1 if given cert is considered self-signed, 0 if not, or -1 on error. |
0d8dbb52 DDO |
110 | * This actually verifies self-signedness only if requested. |
111 | * It calls X509v3_cache_extensions() | |
112 | * to match issuer and subject names (i.e., the cert being self-issued) and any | |
113 | * present authority key identifier to match the subject key identifier, etc. | |
ade08735 | 114 | */ |
6725682d | 115 | int X509_self_signed(X509 *cert, int verify_signature) |
0f113f3e | 116 | { |
0d8dbb52 | 117 | EVP_PKEY *pkey; |
0c56a648 | 118 | |
0d8dbb52 DDO |
119 | if ((pkey = X509_get0_pubkey(cert)) == NULL) { /* handles cert == NULL */ |
120 | X509err(0, X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY); | |
121 | return -1; | |
122 | } | |
6725682d | 123 | if (!x509v3_cache_extensions(cert)) |
0d8dbb52 DDO |
124 | return -1; |
125 | if ((cert->ex_flags & EXFLAG_SS) == 0) | |
0f113f3e | 126 | return 0; |
0d8dbb52 DDO |
127 | if (!verify_signature) |
128 | return 1; | |
6725682d | 129 | return X509_verify(cert, pkey); |
0d8dbb52 | 130 | } |
2dabd822 | 131 | |
0d8dbb52 | 132 | /* Given a certificate try and find an exact match in the store */ |
2dabd822 | 133 | static X509 *lookup_cert_match(X509_STORE_CTX *ctx, X509 *x) |
0f113f3e MC |
134 | { |
135 | STACK_OF(X509) *certs; | |
136 | X509 *xtmp = NULL; | |
137 | int i; | |
138 | /* Lookup all certs with matching subject name */ | |
139 | certs = ctx->lookup_certs(ctx, X509_get_subject_name(x)); | |
140 | if (certs == NULL) | |
141 | return NULL; | |
142 | /* Look for exact match */ | |
143 | for (i = 0; i < sk_X509_num(certs); i++) { | |
144 | xtmp = sk_X509_value(certs, i); | |
145 | if (!X509_cmp(xtmp, x)) | |
146 | break; | |
e9e7b5df | 147 | xtmp = NULL; |
0f113f3e | 148 | } |
e9e7b5df | 149 | if (xtmp != NULL && !X509_up_ref(xtmp)) |
0f113f3e MC |
150 | xtmp = NULL; |
151 | sk_X509_pop_free(certs, X509_free); | |
152 | return xtmp; | |
153 | } | |
2dabd822 | 154 | |
70dd3c65 VD |
155 | /*- |
156 | * Inform the verify callback of an error. | |
157 | * If B<x> is not NULL it is the error cert, otherwise use the chain cert at | |
158 | * B<depth>. | |
159 | * If B<err> is not X509_V_OK, that's the error value, otherwise leave | |
160 | * unchanged (presumably set by the caller). | |
161 | * | |
162 | * Returns 0 to abort verification with an error, non-zero to continue. | |
163 | */ | |
164 | static int verify_cb_cert(X509_STORE_CTX *ctx, X509 *x, int depth, int err) | |
165 | { | |
166 | ctx->error_depth = depth; | |
167 | ctx->current_cert = (x != NULL) ? x : sk_X509_value(ctx->chain, depth); | |
168 | if (err != X509_V_OK) | |
169 | ctx->error = err; | |
170 | return ctx->verify_cb(0, ctx); | |
171 | } | |
172 | ||
173 | /*- | |
174 | * Inform the verify callback of an error, CRL-specific variant. Here, the | |
175 | * error depth and certificate are already set, we just specify the error | |
176 | * number. | |
177 | * | |
178 | * Returns 0 to abort verification with an error, non-zero to continue. | |
179 | */ | |
180 | static int verify_cb_crl(X509_STORE_CTX *ctx, int err) | |
181 | { | |
182 | ctx->error = err; | |
183 | return ctx->verify_cb(0, ctx); | |
184 | } | |
185 | ||
fbb82a60 VD |
186 | static int check_auth_level(X509_STORE_CTX *ctx) |
187 | { | |
188 | int i; | |
189 | int num = sk_X509_num(ctx->chain); | |
190 | ||
191 | if (ctx->param->auth_level <= 0) | |
192 | return 1; | |
193 | ||
194 | for (i = 0; i < num; ++i) { | |
195 | X509 *cert = sk_X509_value(ctx->chain, i); | |
196 | ||
197 | /* | |
198 | * We've already checked the security of the leaf key, so here we only | |
199 | * check the security of issuer keys. | |
200 | */ | |
201 | if (i > 0 && !check_key_level(ctx, cert) && | |
202 | verify_cb_cert(ctx, cert, i, X509_V_ERR_CA_KEY_TOO_SMALL) == 0) | |
203 | return 0; | |
204 | /* | |
205 | * We also check the signature algorithm security of all certificates | |
206 | * except those of the trust anchor at index num-1. | |
207 | */ | |
208 | if (i < num - 1 && !check_sig_level(ctx, cert) && | |
209 | verify_cb_cert(ctx, cert, i, X509_V_ERR_CA_MD_TOO_WEAK) == 0) | |
210 | return 0; | |
211 | } | |
212 | return 1; | |
213 | } | |
214 | ||
d9b8b89b VD |
215 | static int verify_chain(X509_STORE_CTX *ctx) |
216 | { | |
d9b8b89b VD |
217 | int err; |
218 | int ok; | |
219 | ||
220 | /* | |
221 | * Before either returning with an error, or continuing with CRL checks, | |
222 | * instantiate chain public key parameters. | |
223 | */ | |
224 | if ((ok = build_chain(ctx)) == 0 || | |
67ecd65c | 225 | (ok = check_chain(ctx)) == 0 || |
fbb82a60 | 226 | (ok = check_auth_level(ctx)) == 0 || |
d9b8b89b VD |
227 | (ok = check_id(ctx)) == 0 || 1) |
228 | X509_get_pubkey_parameters(NULL, ctx->chain); | |
229 | if (ok == 0 || (ok = ctx->check_revocation(ctx)) == 0) | |
230 | return ok; | |
231 | ||
232 | err = X509_chain_check_suiteb(&ctx->error_depth, NULL, ctx->chain, | |
233 | ctx->param->flags); | |
234 | if (err != X509_V_OK) { | |
70dd3c65 | 235 | if ((ok = verify_cb_cert(ctx, NULL, ctx->error_depth, err)) == 0) |
d9b8b89b VD |
236 | return ok; |
237 | } | |
238 | ||
239 | /* Verify chain signatures and expiration times */ | |
240 | ok = (ctx->verify != NULL) ? ctx->verify(ctx) : internal_verify(ctx); | |
241 | if (!ok) | |
242 | return ok; | |
243 | ||
8545051c DB |
244 | if ((ok = check_name_constraints(ctx)) == 0) |
245 | return ok; | |
246 | ||
d9b8b89b VD |
247 | #ifndef OPENSSL_NO_RFC3779 |
248 | /* RFC 3779 path validation, now that CRL check has been done */ | |
9021a5df | 249 | if ((ok = X509v3_asid_validate_path(ctx)) == 0) |
d9b8b89b | 250 | return ok; |
9021a5df | 251 | if ((ok = X509v3_addr_validate_path(ctx)) == 0) |
d9b8b89b VD |
252 | return ok; |
253 | #endif | |
254 | ||
255 | /* If we get this far evaluate policies */ | |
256 | if (ctx->param->flags & X509_V_FLAG_POLICY_CHECK) | |
257 | ok = ctx->check_policy(ctx); | |
258 | return ok; | |
259 | } | |
260 | ||
6b691a5c | 261 | int X509_verify_cert(X509_STORE_CTX *ctx) |
0f113f3e | 262 | { |
b9aec69a | 263 | SSL_DANE *dane = ctx->dane; |
f3e235ed | 264 | int ret; |
d9b8b89b | 265 | |
0f113f3e MC |
266 | if (ctx->cert == NULL) { |
267 | X509err(X509_F_X509_VERIFY_CERT, X509_R_NO_CERT_SET_FOR_US_TO_VERIFY); | |
f3e235ed | 268 | ctx->error = X509_V_ERR_INVALID_CALL; |
0f113f3e MC |
269 | return -1; |
270 | } | |
d9b8b89b | 271 | |
aae41f8c MC |
272 | if (ctx->chain != NULL) { |
273 | /* | |
274 | * This X509_STORE_CTX has already been used to verify a cert. We | |
275 | * cannot do another one. | |
276 | */ | |
277 | X509err(X509_F_X509_VERIFY_CERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
f3e235ed | 278 | ctx->error = X509_V_ERR_INVALID_CALL; |
aae41f8c MC |
279 | return -1; |
280 | } | |
0f113f3e | 281 | |
eeccc237 | 282 | if (!X509_add_cert_new(&ctx->chain, ctx->cert, X509_ADD_FLAG_UP_REF)) { |
f3e235ed | 283 | ctx->error = X509_V_ERR_OUT_OF_MEM; |
d9b8b89b | 284 | return -1; |
0f113f3e | 285 | } |
d9b8b89b | 286 | ctx->num_untrusted = 1; |
5d7c222d | 287 | |
fbb82a60 VD |
288 | /* If the peer's public key is too weak, we can stop early. */ |
289 | if (!check_key_level(ctx, ctx->cert) && | |
290 | !verify_cb_cert(ctx, ctx->cert, 0, X509_V_ERR_EE_KEY_TOO_SMALL)) | |
291 | return 0; | |
292 | ||
f3e235ed VD |
293 | if (DANETLS_ENABLED(dane)) |
294 | ret = dane_verify(ctx); | |
295 | else | |
296 | ret = verify_chain(ctx); | |
297 | ||
170b7358 | 298 | /* |
f3e235ed VD |
299 | * Safety-net. If we are returning an error, we must also set ctx->error, |
300 | * so that the chain is not considered verified should the error be ignored | |
301 | * (e.g. TLS with SSL_VERIFY_NONE). | |
170b7358 | 302 | */ |
f3e235ed VD |
303 | if (ret <= 0 && ctx->error == X509_V_OK) |
304 | ctx->error = X509_V_ERR_UNSPECIFIED; | |
305 | return ret; | |
0f113f3e MC |
306 | } |
307 | ||
308 | /* | |
309 | * Given a STACK_OF(X509) find the issuer of cert (if any) | |
2f043896 | 310 | */ |
2f043896 DSH |
311 | static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x) |
312 | { | |
0f113f3e | 313 | int i; |
c53f7355 | 314 | X509 *issuer, *rv = NULL; |
fbb82a60 | 315 | |
0f113f3e | 316 | for (i = 0; i < sk_X509_num(sk); i++) { |
c53f7355 | 317 | issuer = sk_X509_value(sk, i); |
d18c7ad6 DDO |
318 | /* |
319 | * Below check 'issuer != x' is an optimization and safety precaution: | |
320 | * Candidate issuer cert cannot be the same as the subject cert 'x'. | |
321 | */ | |
322 | if (issuer != x && ctx->check_issued(ctx, x, issuer)) { | |
c53f7355 VD |
323 | rv = issuer; |
324 | if (x509_check_cert_time(ctx, rv, -1)) | |
325 | break; | |
326 | } | |
0f113f3e | 327 | } |
c53f7355 | 328 | return rv; |
2f043896 DSH |
329 | } |
330 | ||
0e7b1383 DDO |
331 | /* |
332 | * Check that the given certificate 'x' is issued by the certificate 'issuer' | |
333 | * and the issuer is not yet in ctx->chain, where the exceptional case | |
334 | * that 'x' is self-issued and ctx->chain has just one element is allowed. | |
335 | */ | |
2f043896 DSH |
336 | static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer) |
337 | { | |
6725682d | 338 | if (x509_likely_issued(issuer, x) != X509_V_OK) |
0e7b1383 DDO |
339 | return 0; |
340 | if ((x->ex_flags & EXFLAG_SI) == 0 || sk_X509_num(ctx->chain) != 1) { | |
0f113f3e MC |
341 | int i; |
342 | X509 *ch; | |
0c56a648 | 343 | |
0f113f3e MC |
344 | for (i = 0; i < sk_X509_num(ctx->chain); i++) { |
345 | ch = sk_X509_value(ctx->chain, i); | |
0e7b1383 DDO |
346 | if (ch == issuer || X509_cmp(ch, issuer) == 0) |
347 | return 0; | |
0f113f3e MC |
348 | } |
349 | } | |
0e7b1383 | 350 | return 1; |
2f043896 DSH |
351 | } |
352 | ||
353 | /* Alternative lookup method: look from a STACK stored in other_ctx */ | |
2f043896 DSH |
354 | static int get_issuer_sk(X509 **issuer, X509_STORE_CTX *ctx, X509 *x) |
355 | { | |
0f113f3e | 356 | *issuer = find_issuer(ctx, ctx->other_ctx, x); |
e9e7b5df BE |
357 | |
358 | if (*issuer == NULL || !X509_up_ref(*issuer)) | |
359 | goto err; | |
360 | ||
361 | return 1; | |
362 | ||
363 | err: | |
364 | *issuer = NULL; | |
365 | return 0; | |
2f043896 | 366 | } |
2f043896 | 367 | |
8cc86b81 DDO |
368 | static STACK_OF(X509) *lookup_certs_sk(X509_STORE_CTX *ctx, |
369 | const X509_NAME *nm) | |
c864e761 DSH |
370 | { |
371 | STACK_OF(X509) *sk = NULL; | |
372 | X509 *x; | |
373 | int i; | |
7fcdbd83 | 374 | |
c864e761 DSH |
375 | for (i = 0; i < sk_X509_num(ctx->other_ctx); i++) { |
376 | x = sk_X509_value(ctx->other_ctx, i); | |
377 | if (X509_NAME_cmp(nm, X509_get_subject_name(x)) == 0) { | |
eeccc237 | 378 | if (!X509_add_cert_new(&sk, x, X509_ADD_FLAG_UP_REF)) { |
bbc3c22c | 379 | sk_X509_pop_free(sk, X509_free); |
7fcdbd83 | 380 | ctx->error = X509_V_ERR_OUT_OF_MEM; |
c864e761 DSH |
381 | return NULL; |
382 | } | |
c864e761 DSH |
383 | } |
384 | } | |
385 | return sk; | |
386 | } | |
387 | ||
0daccd4d VD |
388 | /* |
389 | * Check EE or CA certificate purpose. For trusted certificates explicit local | |
390 | * auxiliary trust can be used to override EKU-restrictions. | |
391 | */ | |
392 | static int check_purpose(X509_STORE_CTX *ctx, X509 *x, int purpose, int depth, | |
393 | int must_be_ca) | |
394 | { | |
0daccd4d VD |
395 | int tr_ok = X509_TRUST_UNTRUSTED; |
396 | ||
397 | /* | |
398 | * For trusted certificates we want to see whether any auxiliary trust | |
33cc5dde | 399 | * settings trump the purpose constraints. |
0daccd4d VD |
400 | * |
401 | * This is complicated by the fact that the trust ordinals in | |
402 | * ctx->param->trust are entirely independent of the purpose ordinals in | |
403 | * ctx->param->purpose! | |
404 | * | |
405 | * What connects them is their mutual initialization via calls from | |
406 | * X509_STORE_CTX_set_default() into X509_VERIFY_PARAM_lookup() which sets | |
407 | * related values of both param->trust and param->purpose. It is however | |
408 | * typically possible to infer associated trust values from a purpose value | |
409 | * via the X509_PURPOSE API. | |
410 | * | |
411 | * Therefore, we can only check for trust overrides when the purpose we're | |
412 | * checking is the same as ctx->param->purpose and ctx->param->trust is | |
33cc5dde | 413 | * also set. |
0daccd4d VD |
414 | */ |
415 | if (depth >= ctx->num_untrusted && purpose == ctx->param->purpose) | |
416 | tr_ok = X509_check_trust(x, ctx->param->trust, X509_TRUST_NO_SS_COMPAT); | |
417 | ||
33cc5dde VD |
418 | switch (tr_ok) { |
419 | case X509_TRUST_TRUSTED: | |
0daccd4d | 420 | return 1; |
33cc5dde VD |
421 | case X509_TRUST_REJECTED: |
422 | break; | |
423 | default: | |
424 | switch (X509_check_purpose(x, purpose, must_be_ca > 0)) { | |
425 | case 1: | |
426 | return 1; | |
427 | case 0: | |
428 | break; | |
429 | default: | |
430 | if ((ctx->param->flags & X509_V_FLAG_X509_STRICT) == 0) | |
431 | return 1; | |
432 | } | |
433 | break; | |
434 | } | |
0daccd4d | 435 | |
70dd3c65 | 436 | return verify_cb_cert(ctx, x, depth, X509_V_ERR_INVALID_PURPOSE); |
0daccd4d VD |
437 | } |
438 | ||
0f113f3e MC |
439 | /* |
440 | * Check a certificate chains extensions for consistency with the supplied | |
441 | * purpose | |
11262391 DSH |
442 | */ |
443 | ||
67ecd65c | 444 | static int check_chain(X509_STORE_CTX *ctx) |
11262391 | 445 | { |
0daccd4d | 446 | int i, must_be_ca, plen = 0; |
0f113f3e | 447 | X509 *x; |
0f113f3e MC |
448 | int proxy_path_length = 0; |
449 | int purpose; | |
450 | int allow_proxy_certs; | |
0daccd4d | 451 | int num = sk_X509_num(ctx->chain); |
0f113f3e | 452 | |
35a1cc90 MC |
453 | /*- |
454 | * must_be_ca can have 1 of 3 values: | |
455 | * -1: we accept both CA and non-CA certificates, to allow direct | |
456 | * use of self-signed certificates (which are marked as CA). | |
457 | * 0: we only accept non-CA certificates. This is currently not | |
458 | * used, but the possibility is present for future extensions. | |
459 | * 1: we only accept CA certificates. This is currently used for | |
460 | * all certificates in the chain except the leaf certificate. | |
461 | */ | |
0f113f3e MC |
462 | must_be_ca = -1; |
463 | ||
464 | /* CRL path validation */ | |
465 | if (ctx->parent) { | |
466 | allow_proxy_certs = 0; | |
467 | purpose = X509_PURPOSE_CRL_SIGN; | |
468 | } else { | |
469 | allow_proxy_certs = | |
470 | ! !(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS); | |
0f113f3e MC |
471 | purpose = ctx->param->purpose; |
472 | } | |
473 | ||
0daccd4d | 474 | for (i = 0; i < num; i++) { |
0f113f3e | 475 | int ret; |
1e41dadf | 476 | |
0f113f3e MC |
477 | x = sk_X509_value(ctx->chain, i); |
478 | if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL) | |
479 | && (x->ex_flags & EXFLAG_CRITICAL)) { | |
70dd3c65 VD |
480 | if (!verify_cb_cert(ctx, x, i, |
481 | X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION)) | |
0daccd4d | 482 | return 0; |
0f113f3e MC |
483 | } |
484 | if (!allow_proxy_certs && (x->ex_flags & EXFLAG_PROXY)) { | |
70dd3c65 VD |
485 | if (!verify_cb_cert(ctx, x, i, |
486 | X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED)) | |
0daccd4d | 487 | return 0; |
0f113f3e MC |
488 | } |
489 | ret = X509_check_ca(x); | |
490 | switch (must_be_ca) { | |
491 | case -1: | |
492 | if ((ctx->param->flags & X509_V_FLAG_X509_STRICT) | |
493 | && (ret != 1) && (ret != 0)) { | |
494 | ret = 0; | |
495 | ctx->error = X509_V_ERR_INVALID_CA; | |
496 | } else | |
497 | ret = 1; | |
498 | break; | |
499 | case 0: | |
500 | if (ret != 0) { | |
501 | ret = 0; | |
502 | ctx->error = X509_V_ERR_INVALID_NON_CA; | |
503 | } else | |
504 | ret = 1; | |
505 | break; | |
506 | default: | |
4d9e33ac | 507 | /* X509_V_FLAG_X509_STRICT is implicit for intermediate CAs */ |
0f113f3e | 508 | if ((ret == 0) |
4d9e33ac | 509 | || ((i + 1 < num || ctx->param->flags & X509_V_FLAG_X509_STRICT) |
0f113f3e MC |
510 | && (ret != 1))) { |
511 | ret = 0; | |
512 | ctx->error = X509_V_ERR_INVALID_CA; | |
513 | } else | |
514 | ret = 1; | |
515 | break; | |
516 | } | |
cccf532f TM |
517 | if (num > 1) { |
518 | /* Check for presence of explicit elliptic curve parameters */ | |
519 | ret = check_curve(x); | |
520 | if (ret < 0) | |
521 | ctx->error = X509_V_ERR_UNSPECIFIED; | |
522 | else if (ret == 0) | |
523 | ctx->error = X509_V_ERR_EC_KEY_EXPLICIT_PARAMS; | |
524 | } | |
d72c8b45 DDO |
525 | /* |
526 | * Do the following set of checks only if strict checking is requrested | |
527 | * and not for self-issued (including self-signed) EE (non-CA) certs | |
528 | * because RFC 5280 does not apply to them according RFC 6818 section 2. | |
529 | */ | |
530 | if ((ctx->param->flags & X509_V_FLAG_X509_STRICT) != 0 | |
e41a2c4c DDO |
531 | && num > 1) { /* |
532 | * this should imply | |
533 | * !(i == 0 && (x->ex_flags & EXFLAG_CA) == 0 | |
534 | * && (x->ex_flags & EXFLAG_SI) != 0) | |
535 | */ | |
1e41dadf DDO |
536 | /* Check Basic Constraints according to RFC 5280 section 4.2.1.9 */ |
537 | if (x->ex_pathlen != -1) { | |
538 | if ((x->ex_flags & EXFLAG_CA) == 0) | |
539 | ctx->error = X509_V_ERR_PATHLEN_INVALID_FOR_NON_CA; | |
540 | if ((x->ex_kusage & KU_KEY_CERT_SIGN) == 0) | |
541 | ctx->error = X509_V_ERR_PATHLEN_WITHOUT_KU_KEY_CERT_SIGN; | |
542 | } | |
8a639b9d DDO |
543 | if ((x->ex_flags & EXFLAG_CA) != 0 |
544 | && (x->ex_flags & EXFLAG_BCONS) != 0 | |
545 | && (x->ex_flags & EXFLAG_BCONS_CRITICAL) == 0) | |
546 | ctx->error = X509_V_ERR_CA_BCONS_NOT_CRITICAL; | |
d72c8b45 | 547 | /* Check Key Usage according to RFC 5280 section 4.2.1.3 */ |
bb377c8d DDO |
548 | if ((x->ex_flags & EXFLAG_CA) != 0) { |
549 | if ((x->ex_flags & EXFLAG_KUSAGE) == 0) | |
550 | ctx->error = X509_V_ERR_CA_CERT_MISSING_KEY_USAGE; | |
551 | } else { | |
552 | if ((x->ex_kusage & KU_KEY_CERT_SIGN) != 0) | |
553 | ctx->error = X509_V_ERR_KU_KEY_CERT_SIGN_INVALID_FOR_NON_CA; | |
554 | } | |
1e41dadf DDO |
555 | /* Check issuer is non-empty acc. to RFC 5280 section 4.1.2.4 */ |
556 | if (X509_NAME_entry_count(X509_get_issuer_name(x)) == 0) | |
557 | ctx->error = X509_V_ERR_ISSUER_NAME_EMPTY; | |
558 | /* Check subject is non-empty acc. to RFC 5280 section 4.1.2.6 */ | |
559 | if (((x->ex_flags & EXFLAG_CA) != 0 | |
560 | || (x->ex_kusage & KU_CRL_SIGN) != 0 | |
561 | || x->altname == NULL | |
562 | ) && X509_NAME_entry_count(X509_get_subject_name(x)) == 0) | |
563 | ctx->error = X509_V_ERR_SUBJECT_NAME_EMPTY; | |
da6c691d DDO |
564 | if (X509_NAME_entry_count(X509_get_subject_name(x)) == 0 |
565 | && x->altname != NULL | |
566 | && (x->ex_flags & EXFLAG_SAN_CRITICAL) == 0) | |
567 | ctx->error = X509_V_ERR_EMPTY_SUBJECT_SAN_NOT_CRITICAL; | |
1e41dadf DDO |
568 | /* Check SAN is non-empty according to RFC 5280 section 4.2.1.6 */ |
569 | if (x->altname != NULL && sk_GENERAL_NAME_num(x->altname) <= 0) | |
570 | ctx->error = X509_V_ERR_EMPTY_SUBJECT_ALT_NAME; | |
571 | /* TODO add more checks on SAN entries */ | |
572 | /* Check sig alg consistency acc. to RFC 5280 section 4.1.1.2 */ | |
573 | if (X509_ALGOR_cmp(&x->sig_alg, &x->cert_info.signature) != 0) | |
574 | ctx->error = X509_V_ERR_SIGNATURE_ALGORITHM_INCONSISTENCY; | |
89f13ca4 DDO |
575 | if (x->akid != NULL && (x->ex_flags & EXFLAG_AKID_CRITICAL) != 0) |
576 | ctx->error = X509_V_ERR_AUTHORITY_KEY_IDENTIFIER_CRITICAL; | |
577 | if (x->skid != NULL && (x->ex_flags & EXFLAG_SKID_CRITICAL) != 0) | |
578 | ctx->error = X509_V_ERR_SUBJECT_KEY_IDENTIFIER_CRITICAL; | |
1e41dadf DDO |
579 | if (X509_get_version(x) >= 2) { /* at least X.509v3 */ |
580 | /* Check AKID presence acc. to RFC 5280 section 4.2.1.1 */ | |
581 | if (i + 1 < num /* | |
582 | * this means not last cert in chain, | |
583 | * taken as "generated by conforming CAs" | |
584 | */ | |
585 | && (x->akid == NULL || x->akid->keyid == NULL)) | |
586 | ctx->error = X509_V_ERR_MISSING_AUTHORITY_KEY_IDENTIFIER; | |
1e41dadf DDO |
587 | /* Check SKID presence acc. to RFC 5280 section 4.2.1.2 */ |
588 | if ((x->ex_flags & EXFLAG_CA) != 0 && x->skid == NULL) | |
589 | ctx->error = X509_V_ERR_MISSING_SUBJECT_KEY_IDENTIFIER; | |
82bdd641 DDO |
590 | } else { |
591 | if (sk_X509_EXTENSION_num(X509_get0_extensions(x)) > 0) | |
592 | ctx->error = X509_V_ERR_EXTENSIONS_REQUIRE_VERSION_3; | |
1e41dadf | 593 | } |
fa86e2ee | 594 | } |
1e41dadf DDO |
595 | if (ctx->error != X509_V_OK) |
596 | ret = 0; | |
70dd3c65 VD |
597 | if (ret == 0 && !verify_cb_cert(ctx, x, i, X509_V_OK)) |
598 | return 0; | |
599 | /* check_purpose() makes the callback as needed */ | |
600 | if (purpose > 0 && !check_purpose(ctx, x, purpose, i, must_be_ca)) | |
601 | return 0; | |
dc5831da VD |
602 | /* Check pathlen */ |
603 | if ((i > 1) && (x->ex_pathlen != -1) | |
604 | && (plen > (x->ex_pathlen + proxy_path_length))) { | |
70dd3c65 | 605 | if (!verify_cb_cert(ctx, x, i, X509_V_ERR_PATH_LENGTH_EXCEEDED)) |
0daccd4d | 606 | return 0; |
0f113f3e | 607 | } |
ade08735 | 608 | /* Increment path length if not a self-issued intermediate CA */ |
dc5831da | 609 | if (i > 0 && (x->ex_flags & EXFLAG_SI) == 0) |
0f113f3e MC |
610 | plen++; |
611 | /* | |
612 | * If this certificate is a proxy certificate, the next certificate | |
613 | * must be another proxy certificate or a EE certificate. If not, | |
614 | * the next certificate must be a CA certificate. | |
615 | */ | |
616 | if (x->ex_flags & EXFLAG_PROXY) { | |
ed17c7c1 RL |
617 | /* |
618 | * RFC3820, 4.1.3 (b)(1) stipulates that if pCPathLengthConstraint | |
619 | * is less than max_path_length, the former should be copied to | |
620 | * the latter, and 4.1.4 (a) stipulates that max_path_length | |
621 | * should be verified to be larger than zero and decrement it. | |
622 | * | |
623 | * Because we're checking the certs in the reverse order, we start | |
624 | * with verifying that proxy_path_length isn't larger than pcPLC, | |
625 | * and copy the latter to the former if it is, and finally, | |
626 | * increment proxy_path_length. | |
627 | */ | |
628 | if (x->ex_pcpathlen != -1) { | |
629 | if (proxy_path_length > x->ex_pcpathlen) { | |
630 | if (!verify_cb_cert(ctx, x, i, | |
631 | X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED)) | |
632 | return 0; | |
633 | } | |
634 | proxy_path_length = x->ex_pcpathlen; | |
0f113f3e MC |
635 | } |
636 | proxy_path_length++; | |
637 | must_be_ca = 0; | |
638 | } else | |
639 | must_be_ca = 1; | |
640 | } | |
0daccd4d | 641 | return 1; |
11262391 DSH |
642 | } |
643 | ||
55a6250f VD |
644 | static int has_san_id(X509 *x, int gtype) |
645 | { | |
646 | int i; | |
647 | int ret = 0; | |
648 | GENERAL_NAMES *gs = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL); | |
649 | ||
650 | if (gs == NULL) | |
651 | return 0; | |
652 | ||
653 | for (i = 0; i < sk_GENERAL_NAME_num(gs); i++) { | |
654 | GENERAL_NAME *g = sk_GENERAL_NAME_value(gs, i); | |
655 | ||
656 | if (g->type == gtype) { | |
657 | ret = 1; | |
658 | break; | |
659 | } | |
660 | } | |
661 | GENERAL_NAMES_free(gs); | |
662 | return ret; | |
663 | } | |
664 | ||
e9746e03 | 665 | static int check_name_constraints(X509_STORE_CTX *ctx) |
0f113f3e | 666 | { |
70dd3c65 VD |
667 | int i; |
668 | ||
0f113f3e MC |
669 | /* Check name constraints for all certificates */ |
670 | for (i = sk_X509_num(ctx->chain) - 1; i >= 0; i--) { | |
70dd3c65 VD |
671 | X509 *x = sk_X509_value(ctx->chain, i); |
672 | int j; | |
673 | ||
ade08735 | 674 | /* Ignore self-issued certs unless last in chain */ |
0f113f3e MC |
675 | if (i && (x->ex_flags & EXFLAG_SI)) |
676 | continue; | |
c8223538 RL |
677 | |
678 | /* | |
679 | * Proxy certificates policy has an extra constraint, where the | |
680 | * certificate subject MUST be the issuer with a single CN entry | |
681 | * added. | |
682 | * (RFC 3820: 3.4, 4.1.3 (a)(4)) | |
683 | */ | |
684 | if (x->ex_flags & EXFLAG_PROXY) { | |
685 | X509_NAME *tmpsubject = X509_get_subject_name(x); | |
686 | X509_NAME *tmpissuer = X509_get_issuer_name(x); | |
687 | X509_NAME_ENTRY *tmpentry = NULL; | |
688 | int last_object_nid = 0; | |
689 | int err = X509_V_OK; | |
690 | int last_object_loc = X509_NAME_entry_count(tmpsubject) - 1; | |
691 | ||
692 | /* Check that there are at least two RDNs */ | |
693 | if (last_object_loc < 1) { | |
694 | err = X509_V_ERR_PROXY_SUBJECT_NAME_VIOLATION; | |
695 | goto proxy_name_done; | |
696 | } | |
697 | ||
698 | /* | |
699 | * Check that there is exactly one more RDN in subject as | |
700 | * there is in issuer. | |
701 | */ | |
702 | if (X509_NAME_entry_count(tmpsubject) | |
703 | != X509_NAME_entry_count(tmpissuer) + 1) { | |
704 | err = X509_V_ERR_PROXY_SUBJECT_NAME_VIOLATION; | |
705 | goto proxy_name_done; | |
706 | } | |
707 | ||
708 | /* | |
709 | * Check that the last subject component isn't part of a | |
710 | * multivalued RDN | |
711 | */ | |
712 | if (X509_NAME_ENTRY_set(X509_NAME_get_entry(tmpsubject, | |
713 | last_object_loc)) | |
714 | == X509_NAME_ENTRY_set(X509_NAME_get_entry(tmpsubject, | |
715 | last_object_loc - 1))) { | |
716 | err = X509_V_ERR_PROXY_SUBJECT_NAME_VIOLATION; | |
717 | goto proxy_name_done; | |
718 | } | |
719 | ||
720 | /* | |
721 | * Check that the last subject RDN is a commonName, and that | |
722 | * all the previous RDNs match the issuer exactly | |
723 | */ | |
724 | tmpsubject = X509_NAME_dup(tmpsubject); | |
725 | if (tmpsubject == NULL) { | |
726 | X509err(X509_F_CHECK_NAME_CONSTRAINTS, ERR_R_MALLOC_FAILURE); | |
727 | ctx->error = X509_V_ERR_OUT_OF_MEM; | |
728 | return 0; | |
729 | } | |
730 | ||
731 | tmpentry = | |
732 | X509_NAME_delete_entry(tmpsubject, last_object_loc); | |
733 | last_object_nid = | |
734 | OBJ_obj2nid(X509_NAME_ENTRY_get_object(tmpentry)); | |
735 | ||
736 | if (last_object_nid != NID_commonName | |
737 | || X509_NAME_cmp(tmpsubject, tmpissuer) != 0) { | |
738 | err = X509_V_ERR_PROXY_SUBJECT_NAME_VIOLATION; | |
739 | } | |
740 | ||
741 | X509_NAME_ENTRY_free(tmpentry); | |
742 | X509_NAME_free(tmpsubject); | |
743 | ||
744 | proxy_name_done: | |
745 | if (err != X509_V_OK | |
746 | && !verify_cb_cert(ctx, x, i, err)) | |
747 | return 0; | |
748 | } | |
749 | ||
0f113f3e MC |
750 | /* |
751 | * Check against constraints for all certificates higher in chain | |
752 | * including trust anchor. Trust anchor not strictly speaking needed | |
753 | * but if it includes constraints it is to be assumed it expects them | |
754 | * to be obeyed. | |
755 | */ | |
756 | for (j = sk_X509_num(ctx->chain) - 1; j > i; j--) { | |
757 | NAME_CONSTRAINTS *nc = sk_X509_value(ctx->chain, j)->nc; | |
70dd3c65 | 758 | |
0f113f3e | 759 | if (nc) { |
70dd3c65 VD |
760 | int rv = NAME_CONSTRAINTS_check(x, nc); |
761 | ||
5bd5dcd4 | 762 | /* If EE certificate check commonName too */ |
55a6250f VD |
763 | if (rv == X509_V_OK && i == 0 |
764 | && (ctx->param->hostflags | |
765 | & X509_CHECK_FLAG_NEVER_CHECK_SUBJECT) == 0 | |
766 | && ((ctx->param->hostflags | |
767 | & X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT) != 0 | |
768 | || !has_san_id(x, GEN_DNS))) | |
5bd5dcd4 DSH |
769 | rv = NAME_CONSTRAINTS_check_CN(x, nc); |
770 | ||
f3e235ed VD |
771 | switch (rv) { |
772 | case X509_V_OK: | |
773 | break; | |
774 | case X509_V_ERR_OUT_OF_MEM: | |
70dd3c65 | 775 | return 0; |
f3e235ed VD |
776 | default: |
777 | if (!verify_cb_cert(ctx, x, i, rv)) | |
778 | return 0; | |
779 | break; | |
780 | } | |
0f113f3e MC |
781 | } |
782 | } | |
783 | } | |
784 | return 1; | |
785 | } | |
e9746e03 | 786 | |
3bf15e29 | 787 | static int check_id_error(X509_STORE_CTX *ctx, int errcode) |
0f113f3e | 788 | { |
70dd3c65 | 789 | return verify_cb_cert(ctx, ctx->cert, 0, errcode); |
0f113f3e | 790 | } |
3bf15e29 | 791 | |
9689a6ae | 792 | static int check_hosts(X509 *x, X509_VERIFY_PARAM *vpm) |
0f113f3e MC |
793 | { |
794 | int i; | |
9689a6ae | 795 | int n = sk_OPENSSL_STRING_num(vpm->hosts); |
0f113f3e MC |
796 | char *name; |
797 | ||
9689a6ae DSH |
798 | if (vpm->peername != NULL) { |
799 | OPENSSL_free(vpm->peername); | |
800 | vpm->peername = NULL; | |
a0724ef1 | 801 | } |
0f113f3e | 802 | for (i = 0; i < n; ++i) { |
9689a6ae DSH |
803 | name = sk_OPENSSL_STRING_value(vpm->hosts, i); |
804 | if (X509_check_host(x, name, 0, vpm->hostflags, &vpm->peername) > 0) | |
0f113f3e MC |
805 | return 1; |
806 | } | |
807 | return n == 0; | |
808 | } | |
8abffa4a | 809 | |
3bf15e29 | 810 | static int check_id(X509_STORE_CTX *ctx) |
0f113f3e MC |
811 | { |
812 | X509_VERIFY_PARAM *vpm = ctx->param; | |
0f113f3e | 813 | X509 *x = ctx->cert; |
9689a6ae | 814 | if (vpm->hosts && check_hosts(x, vpm) <= 0) { |
0f113f3e MC |
815 | if (!check_id_error(ctx, X509_V_ERR_HOSTNAME_MISMATCH)) |
816 | return 0; | |
817 | } | |
9689a6ae | 818 | if (vpm->email && X509_check_email(x, vpm->email, vpm->emaillen, 0) <= 0) { |
0f113f3e MC |
819 | if (!check_id_error(ctx, X509_V_ERR_EMAIL_MISMATCH)) |
820 | return 0; | |
821 | } | |
9689a6ae | 822 | if (vpm->ip && X509_check_ip(x, vpm->ip, vpm->iplen, 0) <= 0) { |
0f113f3e MC |
823 | if (!check_id_error(ctx, X509_V_ERR_IP_ADDRESS_MISMATCH)) |
824 | return 0; | |
825 | } | |
826 | return 1; | |
827 | } | |
3bf15e29 | 828 | |
d9b8b89b | 829 | static int check_trust(X509_STORE_CTX *ctx, int num_untrusted) |
51630a37 | 830 | { |
70dd3c65 | 831 | int i; |
0f113f3e | 832 | X509 *x = NULL; |
d9b8b89b | 833 | X509 *mx; |
b9aec69a | 834 | SSL_DANE *dane = ctx->dane; |
d9b8b89b VD |
835 | int num = sk_X509_num(ctx->chain); |
836 | int trust; | |
837 | ||
bdcadca2 VD |
838 | /* |
839 | * Check for a DANE issuer at depth 1 or greater, if it is a DANE-TA(2) | |
840 | * match, we're done, otherwise we'll merely record the match depth. | |
841 | */ | |
842 | if (DANETLS_HAS_TA(dane) && num_untrusted > 0 && num_untrusted < num) { | |
170b7358 VD |
843 | switch (trust = check_dane_issuer(ctx, num_untrusted)) { |
844 | case X509_TRUST_TRUSTED: | |
845 | case X509_TRUST_REJECTED: | |
846 | return trust; | |
847 | } | |
848 | } | |
849 | ||
d9b8b89b VD |
850 | /* |
851 | * Check trusted certificates in chain at depth num_untrusted and up. | |
852 | * Note, that depths 0..num_untrusted-1 may also contain trusted | |
853 | * certificates, but the caller is expected to have already checked those, | |
854 | * and wants to incrementally check just any added since. | |
855 | */ | |
856 | for (i = num_untrusted; i < num; i++) { | |
0f113f3e | 857 | x = sk_X509_value(ctx->chain, i); |
d9b8b89b | 858 | trust = X509_check_trust(x, ctx->param->trust, 0); |
0f113f3e | 859 | /* If explicitly trusted return trusted */ |
d9b8b89b VD |
860 | if (trust == X509_TRUST_TRUSTED) |
861 | goto trusted; | |
862 | if (trust == X509_TRUST_REJECTED) | |
863 | goto rejected; | |
0f113f3e | 864 | } |
d9b8b89b | 865 | |
0f113f3e | 866 | /* |
d9b8b89b VD |
867 | * If we are looking at a trusted certificate, and accept partial chains, |
868 | * the chain is PKIX trusted. | |
0f113f3e | 869 | */ |
d9b8b89b VD |
870 | if (num_untrusted < num) { |
871 | if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN) | |
872 | goto trusted; | |
873 | return X509_TRUST_UNTRUSTED; | |
874 | } | |
875 | ||
497ecc0d | 876 | if (num_untrusted == num && ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN) { |
d9b8b89b VD |
877 | /* |
878 | * Last-resort call with no new trusted certificates, check the leaf | |
879 | * for a direct trust store match. | |
880 | */ | |
bdcadca2 VD |
881 | i = 0; |
882 | x = sk_X509_value(ctx->chain, i); | |
0f113f3e | 883 | mx = lookup_cert_match(ctx, x); |
d9b8b89b VD |
884 | if (!mx) |
885 | return X509_TRUST_UNTRUSTED; | |
886 | ||
887 | /* | |
888 | * Check explicit auxiliary trust/reject settings. If none are set, | |
889 | * we'll accept X509_TRUST_UNTRUSTED when not self-signed. | |
890 | */ | |
891 | trust = X509_check_trust(mx, ctx->param->trust, 0); | |
892 | if (trust == X509_TRUST_REJECTED) { | |
893 | X509_free(mx); | |
894 | goto rejected; | |
0f113f3e | 895 | } |
d9b8b89b VD |
896 | |
897 | /* Replace leaf with trusted match */ | |
898 | (void) sk_X509_set(ctx->chain, 0, mx); | |
899 | X509_free(x); | |
900 | ctx->num_untrusted = 0; | |
901 | goto trusted; | |
0f113f3e MC |
902 | } |
903 | ||
904 | /* | |
905 | * If no trusted certs in chain at all return untrusted and allow | |
906 | * standard (no issuer cert) etc errors to be indicated. | |
907 | */ | |
908 | return X509_TRUST_UNTRUSTED; | |
d9b8b89b VD |
909 | |
910 | rejected: | |
70dd3c65 | 911 | if (!verify_cb_cert(ctx, x, i, X509_V_ERR_CERT_REJECTED)) |
d9b8b89b VD |
912 | return X509_TRUST_REJECTED; |
913 | return X509_TRUST_UNTRUSTED; | |
914 | ||
915 | trusted: | |
170b7358 VD |
916 | if (!DANETLS_ENABLED(dane)) |
917 | return X509_TRUST_TRUSTED; | |
918 | if (dane->pdpth < 0) | |
919 | dane->pdpth = num_untrusted; | |
920 | /* With DANE, PKIX alone is not trusted until we have both */ | |
921 | if (dane->mdpth >= 0) | |
922 | return X509_TRUST_TRUSTED; | |
923 | return X509_TRUST_UNTRUSTED; | |
51630a37 DSH |
924 | } |
925 | ||
b545dc67 | 926 | static int check_revocation(X509_STORE_CTX *ctx) |
0f113f3e | 927 | { |
4c9b0a03 | 928 | int i = 0, last = 0, ok = 0; |
0f113f3e MC |
929 | if (!(ctx->param->flags & X509_V_FLAG_CRL_CHECK)) |
930 | return 1; | |
931 | if (ctx->param->flags & X509_V_FLAG_CRL_CHECK_ALL) | |
932 | last = sk_X509_num(ctx->chain) - 1; | |
933 | else { | |
934 | /* If checking CRL paths this isn't the EE certificate */ | |
935 | if (ctx->parent) | |
936 | return 1; | |
937 | last = 0; | |
938 | } | |
939 | for (i = 0; i <= last; i++) { | |
940 | ctx->error_depth = i; | |
941 | ok = check_cert(ctx); | |
942 | if (!ok) | |
943 | return ok; | |
944 | } | |
945 | return 1; | |
946 | } | |
b545dc67 DSH |
947 | |
948 | static int check_cert(X509_STORE_CTX *ctx) | |
0f113f3e MC |
949 | { |
950 | X509_CRL *crl = NULL, *dcrl = NULL; | |
70dd3c65 VD |
951 | int ok = 0; |
952 | int cnum = ctx->error_depth; | |
953 | X509 *x = sk_X509_value(ctx->chain, cnum); | |
954 | ||
0f113f3e MC |
955 | ctx->current_cert = x; |
956 | ctx->current_issuer = NULL; | |
957 | ctx->current_crl_score = 0; | |
958 | ctx->current_reasons = 0; | |
70dd3c65 | 959 | |
790555d6 RL |
960 | if (x->ex_flags & EXFLAG_PROXY) |
961 | return 1; | |
962 | ||
0f113f3e | 963 | while (ctx->current_reasons != CRLDP_ALL_REASONS) { |
70dd3c65 VD |
964 | unsigned int last_reasons = ctx->current_reasons; |
965 | ||
0f113f3e MC |
966 | /* Try to retrieve relevant CRL */ |
967 | if (ctx->get_crl) | |
968 | ok = ctx->get_crl(ctx, &crl, x); | |
969 | else | |
970 | ok = get_crl_delta(ctx, &crl, &dcrl, x); | |
971 | /* | |
972 | * If error looking up CRL, nothing we can do except notify callback | |
973 | */ | |
974 | if (!ok) { | |
70dd3c65 VD |
975 | ok = verify_cb_crl(ctx, X509_V_ERR_UNABLE_TO_GET_CRL); |
976 | goto done; | |
0f113f3e MC |
977 | } |
978 | ctx->current_crl = crl; | |
979 | ok = ctx->check_crl(ctx, crl); | |
980 | if (!ok) | |
70dd3c65 | 981 | goto done; |
0f113f3e MC |
982 | |
983 | if (dcrl) { | |
984 | ok = ctx->check_crl(ctx, dcrl); | |
985 | if (!ok) | |
70dd3c65 | 986 | goto done; |
0f113f3e MC |
987 | ok = ctx->cert_crl(ctx, dcrl, x); |
988 | if (!ok) | |
70dd3c65 | 989 | goto done; |
0f113f3e MC |
990 | } else |
991 | ok = 1; | |
992 | ||
993 | /* Don't look in full CRL if delta reason is removefromCRL */ | |
994 | if (ok != 2) { | |
995 | ok = ctx->cert_crl(ctx, crl, x); | |
996 | if (!ok) | |
70dd3c65 | 997 | goto done; |
0f113f3e MC |
998 | } |
999 | ||
1000 | X509_CRL_free(crl); | |
1001 | X509_CRL_free(dcrl); | |
1002 | crl = NULL; | |
1003 | dcrl = NULL; | |
1004 | /* | |
60250017 | 1005 | * If reasons not updated we won't get anywhere by another iteration, |
0f113f3e MC |
1006 | * so exit loop. |
1007 | */ | |
1008 | if (last_reasons == ctx->current_reasons) { | |
70dd3c65 VD |
1009 | ok = verify_cb_crl(ctx, X509_V_ERR_UNABLE_TO_GET_CRL); |
1010 | goto done; | |
0f113f3e MC |
1011 | } |
1012 | } | |
70dd3c65 | 1013 | done: |
0f113f3e MC |
1014 | X509_CRL_free(crl); |
1015 | X509_CRL_free(dcrl); | |
1016 | ||
1017 | ctx->current_crl = NULL; | |
1018 | return ok; | |
0f113f3e | 1019 | } |
b545dc67 | 1020 | |
e1a27eb3 DSH |
1021 | /* Check CRL times against values in X509_STORE_CTX */ |
1022 | ||
1023 | static int check_crl_time(X509_STORE_CTX *ctx, X509_CRL *crl, int notify) | |
0f113f3e MC |
1024 | { |
1025 | time_t *ptime; | |
1026 | int i; | |
70dd3c65 | 1027 | |
0f113f3e MC |
1028 | if (notify) |
1029 | ctx->current_crl = crl; | |
1030 | if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME) | |
1031 | ptime = &ctx->param->check_time; | |
d35ff2c0 DW |
1032 | else if (ctx->param->flags & X509_V_FLAG_NO_CHECK_TIME) |
1033 | return 1; | |
0f113f3e MC |
1034 | else |
1035 | ptime = NULL; | |
1036 | ||
568ce3a5 | 1037 | i = X509_cmp_time(X509_CRL_get0_lastUpdate(crl), ptime); |
0f113f3e MC |
1038 | if (i == 0) { |
1039 | if (!notify) | |
1040 | return 0; | |
70dd3c65 | 1041 | if (!verify_cb_crl(ctx, X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD)) |
0f113f3e MC |
1042 | return 0; |
1043 | } | |
1044 | ||
1045 | if (i > 0) { | |
1046 | if (!notify) | |
1047 | return 0; | |
70dd3c65 | 1048 | if (!verify_cb_crl(ctx, X509_V_ERR_CRL_NOT_YET_VALID)) |
0f113f3e MC |
1049 | return 0; |
1050 | } | |
1051 | ||
568ce3a5 DSH |
1052 | if (X509_CRL_get0_nextUpdate(crl)) { |
1053 | i = X509_cmp_time(X509_CRL_get0_nextUpdate(crl), ptime); | |
0f113f3e MC |
1054 | |
1055 | if (i == 0) { | |
1056 | if (!notify) | |
1057 | return 0; | |
70dd3c65 | 1058 | if (!verify_cb_crl(ctx, X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD)) |
0f113f3e MC |
1059 | return 0; |
1060 | } | |
1061 | /* Ignore expiry of base CRL is delta is valid */ | |
1062 | if ((i < 0) && !(ctx->current_crl_score & CRL_SCORE_TIME_DELTA)) { | |
1063 | if (!notify) | |
1064 | return 0; | |
70dd3c65 | 1065 | if (!verify_cb_crl(ctx, X509_V_ERR_CRL_HAS_EXPIRED)) |
0f113f3e MC |
1066 | return 0; |
1067 | } | |
1068 | } | |
1069 | ||
1070 | if (notify) | |
1071 | ctx->current_crl = NULL; | |
1072 | ||
1073 | return 1; | |
1074 | } | |
e1a27eb3 | 1075 | |
d43c4497 | 1076 | static int get_crl_sk(X509_STORE_CTX *ctx, X509_CRL **pcrl, X509_CRL **pdcrl, |
0f113f3e MC |
1077 | X509 **pissuer, int *pscore, unsigned int *preasons, |
1078 | STACK_OF(X509_CRL) *crls) | |
1079 | { | |
1080 | int i, crl_score, best_score = *pscore; | |
1081 | unsigned int reasons, best_reasons = 0; | |
1082 | X509 *x = ctx->current_cert; | |
1083 | X509_CRL *crl, *best_crl = NULL; | |
1084 | X509 *crl_issuer = NULL, *best_crl_issuer = NULL; | |
1085 | ||
1086 | for (i = 0; i < sk_X509_CRL_num(crls); i++) { | |
1087 | crl = sk_X509_CRL_value(crls, i); | |
1088 | reasons = *preasons; | |
1089 | crl_score = get_crl_score(ctx, &crl_issuer, &reasons, crl, x); | |
8b7c51a0 | 1090 | if (crl_score < best_score || crl_score == 0) |
626aa248 DSH |
1091 | continue; |
1092 | /* If current CRL is equivalent use it if it is newer */ | |
8b7c51a0 | 1093 | if (crl_score == best_score && best_crl != NULL) { |
626aa248 | 1094 | int day, sec; |
568ce3a5 DSH |
1095 | if (ASN1_TIME_diff(&day, &sec, X509_CRL_get0_lastUpdate(best_crl), |
1096 | X509_CRL_get0_lastUpdate(crl)) == 0) | |
626aa248 | 1097 | continue; |
e032117d DSH |
1098 | /* |
1099 | * ASN1_TIME_diff never returns inconsistent signs for |day| | |
1100 | * and |sec|. | |
1101 | */ | |
1102 | if (day <= 0 && sec <= 0) | |
626aa248 | 1103 | continue; |
0f113f3e | 1104 | } |
626aa248 DSH |
1105 | best_crl = crl; |
1106 | best_crl_issuer = crl_issuer; | |
1107 | best_score = crl_score; | |
1108 | best_reasons = reasons; | |
0f113f3e MC |
1109 | } |
1110 | ||
1111 | if (best_crl) { | |
222561fe | 1112 | X509_CRL_free(*pcrl); |
0f113f3e MC |
1113 | *pcrl = best_crl; |
1114 | *pissuer = best_crl_issuer; | |
1115 | *pscore = best_score; | |
1116 | *preasons = best_reasons; | |
65cbf983 | 1117 | X509_CRL_up_ref(best_crl); |
25aaa98a RS |
1118 | X509_CRL_free(*pdcrl); |
1119 | *pdcrl = NULL; | |
0f113f3e MC |
1120 | get_delta_sk(ctx, pdcrl, pscore, best_crl, crls); |
1121 | } | |
1122 | ||
1123 | if (best_score >= CRL_SCORE_VALID) | |
1124 | return 1; | |
1125 | ||
1126 | return 0; | |
1127 | } | |
1128 | ||
1129 | /* | |
1130 | * Compare two CRL extensions for delta checking purposes. They should be | |
d43c4497 DSH |
1131 | * both present or both absent. If both present all fields must be identical. |
1132 | */ | |
1133 | ||
1134 | static int crl_extension_match(X509_CRL *a, X509_CRL *b, int nid) | |
0f113f3e MC |
1135 | { |
1136 | ASN1_OCTET_STRING *exta, *extb; | |
1137 | int i; | |
1138 | i = X509_CRL_get_ext_by_NID(a, nid, -1); | |
1139 | if (i >= 0) { | |
1140 | /* Can't have multiple occurrences */ | |
1141 | if (X509_CRL_get_ext_by_NID(a, nid, i) != -1) | |
1142 | return 0; | |
1143 | exta = X509_EXTENSION_get_data(X509_CRL_get_ext(a, i)); | |
1144 | } else | |
1145 | exta = NULL; | |
d43c4497 | 1146 | |
0f113f3e | 1147 | i = X509_CRL_get_ext_by_NID(b, nid, -1); |
d43c4497 | 1148 | |
0f113f3e | 1149 | if (i >= 0) { |
d43c4497 | 1150 | |
0f113f3e MC |
1151 | if (X509_CRL_get_ext_by_NID(b, nid, i) != -1) |
1152 | return 0; | |
1153 | extb = X509_EXTENSION_get_data(X509_CRL_get_ext(b, i)); | |
1154 | } else | |
1155 | extb = NULL; | |
d43c4497 | 1156 | |
0f113f3e MC |
1157 | if (!exta && !extb) |
1158 | return 1; | |
d43c4497 | 1159 | |
0f113f3e MC |
1160 | if (!exta || !extb) |
1161 | return 0; | |
d43c4497 | 1162 | |
0f113f3e MC |
1163 | if (ASN1_OCTET_STRING_cmp(exta, extb)) |
1164 | return 0; | |
d43c4497 | 1165 | |
0f113f3e MC |
1166 | return 1; |
1167 | } | |
d43c4497 DSH |
1168 | |
1169 | /* See if a base and delta are compatible */ | |
1170 | ||
1171 | static int check_delta_base(X509_CRL *delta, X509_CRL *base) | |
0f113f3e MC |
1172 | { |
1173 | /* Delta CRL must be a delta */ | |
1174 | if (!delta->base_crl_number) | |
1175 | return 0; | |
1176 | /* Base must have a CRL number */ | |
1177 | if (!base->crl_number) | |
1178 | return 0; | |
1179 | /* Issuer names must match */ | |
1180 | if (X509_NAME_cmp(X509_CRL_get_issuer(base), X509_CRL_get_issuer(delta))) | |
1181 | return 0; | |
1182 | /* AKID and IDP must match */ | |
1183 | if (!crl_extension_match(delta, base, NID_authority_key_identifier)) | |
1184 | return 0; | |
1185 | if (!crl_extension_match(delta, base, NID_issuing_distribution_point)) | |
1186 | return 0; | |
1187 | /* Delta CRL base number must not exceed Full CRL number. */ | |
1188 | if (ASN1_INTEGER_cmp(delta->base_crl_number, base->crl_number) > 0) | |
1189 | return 0; | |
1190 | /* Delta CRL number must exceed full CRL number */ | |
1191 | if (ASN1_INTEGER_cmp(delta->crl_number, base->crl_number) > 0) | |
1192 | return 1; | |
1193 | return 0; | |
1194 | } | |
1195 | ||
1196 | /* | |
1197 | * For a given base CRL find a delta... maybe extend to delta scoring or | |
1198 | * retrieve a chain of deltas... | |
d43c4497 DSH |
1199 | */ |
1200 | ||
1201 | static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pscore, | |
0f113f3e MC |
1202 | X509_CRL *base, STACK_OF(X509_CRL) *crls) |
1203 | { | |
1204 | X509_CRL *delta; | |
1205 | int i; | |
1206 | if (!(ctx->param->flags & X509_V_FLAG_USE_DELTAS)) | |
1207 | return; | |
1208 | if (!((ctx->current_cert->ex_flags | base->flags) & EXFLAG_FRESHEST)) | |
1209 | return; | |
1210 | for (i = 0; i < sk_X509_CRL_num(crls); i++) { | |
1211 | delta = sk_X509_CRL_value(crls, i); | |
1212 | if (check_delta_base(delta, base)) { | |
1213 | if (check_crl_time(ctx, delta, 0)) | |
1214 | *pscore |= CRL_SCORE_TIME_DELTA; | |
65cbf983 | 1215 | X509_CRL_up_ref(delta); |
0f113f3e MC |
1216 | *dcrl = delta; |
1217 | return; | |
1218 | } | |
1219 | } | |
1220 | *dcrl = NULL; | |
1221 | } | |
1222 | ||
1223 | /* | |
1224 | * For a given CRL return how suitable it is for the supplied certificate | |
1225 | * 'x'. The return value is a mask of several criteria. If the issuer is not | |
1226 | * the certificate issuer this is returned in *pissuer. The reasons mask is | |
1227 | * also used to determine if the CRL is suitable: if no new reasons the CRL | |
1228 | * is rejected, otherwise reasons is updated. | |
4b96839f DSH |
1229 | */ |
1230 | ||
1231 | static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer, | |
0f113f3e MC |
1232 | unsigned int *preasons, X509_CRL *crl, X509 *x) |
1233 | { | |
1234 | ||
1235 | int crl_score = 0; | |
1236 | unsigned int tmp_reasons = *preasons, crl_reasons; | |
1237 | ||
1238 | /* First see if we can reject CRL straight away */ | |
1239 | ||
1240 | /* Invalid IDP cannot be processed */ | |
1241 | if (crl->idp_flags & IDP_INVALID) | |
1242 | return 0; | |
1243 | /* Reason codes or indirect CRLs need extended CRL support */ | |
1244 | if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT)) { | |
1245 | if (crl->idp_flags & (IDP_INDIRECT | IDP_REASONS)) | |
1246 | return 0; | |
1247 | } else if (crl->idp_flags & IDP_REASONS) { | |
1248 | /* If no new reasons reject */ | |
1249 | if (!(crl->idp_reasons & ~tmp_reasons)) | |
1250 | return 0; | |
1251 | } | |
1252 | /* Don't process deltas at this stage */ | |
1253 | else if (crl->base_crl_number) | |
1254 | return 0; | |
1255 | /* If issuer name doesn't match certificate need indirect CRL */ | |
1256 | if (X509_NAME_cmp(X509_get_issuer_name(x), X509_CRL_get_issuer(crl))) { | |
1257 | if (!(crl->idp_flags & IDP_INDIRECT)) | |
1258 | return 0; | |
1259 | } else | |
1260 | crl_score |= CRL_SCORE_ISSUER_NAME; | |
1261 | ||
1262 | if (!(crl->flags & EXFLAG_CRITICAL)) | |
1263 | crl_score |= CRL_SCORE_NOCRITICAL; | |
1264 | ||
1265 | /* Check expiry */ | |
1266 | if (check_crl_time(ctx, crl, 0)) | |
1267 | crl_score |= CRL_SCORE_TIME; | |
1268 | ||
1269 | /* Check authority key ID and locate certificate issuer */ | |
1270 | crl_akid_check(ctx, crl, pissuer, &crl_score); | |
1271 | ||
1272 | /* If we can't locate certificate issuer at this point forget it */ | |
1273 | ||
1274 | if (!(crl_score & CRL_SCORE_AKID)) | |
1275 | return 0; | |
1276 | ||
1277 | /* Check cert for matching CRL distribution points */ | |
1278 | ||
1279 | if (crl_crldp_check(x, crl, crl_score, &crl_reasons)) { | |
1280 | /* If no new reasons reject */ | |
1281 | if (!(crl_reasons & ~tmp_reasons)) | |
1282 | return 0; | |
1283 | tmp_reasons |= crl_reasons; | |
1284 | crl_score |= CRL_SCORE_SCOPE; | |
1285 | } | |
1286 | ||
1287 | *preasons = tmp_reasons; | |
1288 | ||
1289 | return crl_score; | |
1290 | ||
1291 | } | |
4b96839f DSH |
1292 | |
1293 | static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl, | |
0f113f3e MC |
1294 | X509 **pissuer, int *pcrl_score) |
1295 | { | |
1296 | X509 *crl_issuer = NULL; | |
8cc86b81 | 1297 | const X509_NAME *cnm = X509_CRL_get_issuer(crl); |
0f113f3e MC |
1298 | int cidx = ctx->error_depth; |
1299 | int i; | |
1300 | ||
1301 | if (cidx != sk_X509_num(ctx->chain) - 1) | |
1302 | cidx++; | |
1303 | ||
1304 | crl_issuer = sk_X509_value(ctx->chain, cidx); | |
1305 | ||
1306 | if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK) { | |
1307 | if (*pcrl_score & CRL_SCORE_ISSUER_NAME) { | |
1308 | *pcrl_score |= CRL_SCORE_AKID | CRL_SCORE_ISSUER_CERT; | |
1309 | *pissuer = crl_issuer; | |
1310 | return; | |
1311 | } | |
1312 | } | |
1313 | ||
1314 | for (cidx++; cidx < sk_X509_num(ctx->chain); cidx++) { | |
1315 | crl_issuer = sk_X509_value(ctx->chain, cidx); | |
1316 | if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm)) | |
1317 | continue; | |
1318 | if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK) { | |
1319 | *pcrl_score |= CRL_SCORE_AKID | CRL_SCORE_SAME_PATH; | |
1320 | *pissuer = crl_issuer; | |
1321 | return; | |
1322 | } | |
1323 | } | |
1324 | ||
1325 | /* Anything else needs extended CRL support */ | |
1326 | ||
1327 | if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT)) | |
1328 | return; | |
1329 | ||
1330 | /* | |
1331 | * Otherwise the CRL issuer is not on the path. Look for it in the set of | |
1332 | * untrusted certificates. | |
1333 | */ | |
1334 | for (i = 0; i < sk_X509_num(ctx->untrusted); i++) { | |
1335 | crl_issuer = sk_X509_value(ctx->untrusted, i); | |
1336 | if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm)) | |
1337 | continue; | |
1338 | if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK) { | |
1339 | *pissuer = crl_issuer; | |
1340 | *pcrl_score |= CRL_SCORE_AKID; | |
1341 | return; | |
1342 | } | |
1343 | } | |
1344 | } | |
1345 | ||
1346 | /* | |
1347 | * Check the path of a CRL issuer certificate. This creates a new | |
9d84d4ed | 1348 | * X509_STORE_CTX and populates it with most of the parameters from the |
0f113f3e MC |
1349 | * parent. This could be optimised somewhat since a lot of path checking will |
1350 | * be duplicated by the parent, but this will rarely be used in practice. | |
9d84d4ed DSH |
1351 | */ |
1352 | ||
1353 | static int check_crl_path(X509_STORE_CTX *ctx, X509 *x) | |
0f113f3e MC |
1354 | { |
1355 | X509_STORE_CTX crl_ctx; | |
1356 | int ret; | |
70dd3c65 | 1357 | |
0f113f3e MC |
1358 | /* Don't allow recursive CRL path validation */ |
1359 | if (ctx->parent) | |
1360 | return 0; | |
faa9dcd4 | 1361 | if (!X509_STORE_CTX_init(&crl_ctx, ctx->store, x, ctx->untrusted)) |
0f113f3e MC |
1362 | return -1; |
1363 | ||
1364 | crl_ctx.crls = ctx->crls; | |
1365 | /* Copy verify params across */ | |
1366 | X509_STORE_CTX_set0_param(&crl_ctx, ctx->param); | |
1367 | ||
1368 | crl_ctx.parent = ctx; | |
1369 | crl_ctx.verify_cb = ctx->verify_cb; | |
1370 | ||
1371 | /* Verify CRL issuer */ | |
1372 | ret = X509_verify_cert(&crl_ctx); | |
0f113f3e MC |
1373 | if (ret <= 0) |
1374 | goto err; | |
1375 | ||
1376 | /* Check chain is acceptable */ | |
0f113f3e MC |
1377 | ret = check_crl_chain(ctx, ctx->chain, crl_ctx.chain); |
1378 | err: | |
1379 | X509_STORE_CTX_cleanup(&crl_ctx); | |
1380 | return ret; | |
1381 | } | |
1382 | ||
1383 | /* | |
1384 | * RFC3280 says nothing about the relationship between CRL path and | |
1385 | * certificate path, which could lead to situations where a certificate could | |
1386 | * be revoked or validated by a CA not authorised to do so. RFC5280 is more | |
1387 | * strict and states that the two paths must end in the same trust anchor, | |
1388 | * though some discussions remain... until this is resolved we use the | |
1389 | * RFC5280 version | |
9d84d4ed DSH |
1390 | */ |
1391 | ||
1392 | static int check_crl_chain(X509_STORE_CTX *ctx, | |
0f113f3e MC |
1393 | STACK_OF(X509) *cert_path, |
1394 | STACK_OF(X509) *crl_path) | |
1395 | { | |
1396 | X509 *cert_ta, *crl_ta; | |
1397 | cert_ta = sk_X509_value(cert_path, sk_X509_num(cert_path) - 1); | |
1398 | crl_ta = sk_X509_value(crl_path, sk_X509_num(crl_path) - 1); | |
1399 | if (!X509_cmp(cert_ta, crl_ta)) | |
1400 | return 1; | |
1401 | return 0; | |
1402 | } | |
9d84d4ed | 1403 | |
3a83462d MC |
1404 | /*- |
1405 | * Check for match between two dist point names: three separate cases. | |
3e727a3b DSH |
1406 | * 1. Both are relative names and compare X509_NAME types. |
1407 | * 2. One full, one relative. Compare X509_NAME to GENERAL_NAMES. | |
1408 | * 3. Both are full names and compare two GENERAL_NAMES. | |
d0fff69d | 1409 | * 4. One is NULL: automatic match. |
3e727a3b DSH |
1410 | */ |
1411 | ||
3e727a3b | 1412 | static int idp_check_dp(DIST_POINT_NAME *a, DIST_POINT_NAME *b) |
0f113f3e MC |
1413 | { |
1414 | X509_NAME *nm = NULL; | |
1415 | GENERAL_NAMES *gens = NULL; | |
1416 | GENERAL_NAME *gena, *genb; | |
1417 | int i, j; | |
1418 | if (!a || !b) | |
1419 | return 1; | |
1420 | if (a->type == 1) { | |
1421 | if (!a->dpname) | |
1422 | return 0; | |
1423 | /* Case 1: two X509_NAME */ | |
1424 | if (b->type == 1) { | |
1425 | if (!b->dpname) | |
1426 | return 0; | |
1427 | if (!X509_NAME_cmp(a->dpname, b->dpname)) | |
1428 | return 1; | |
1429 | else | |
1430 | return 0; | |
1431 | } | |
1432 | /* Case 2: set name and GENERAL_NAMES appropriately */ | |
1433 | nm = a->dpname; | |
1434 | gens = b->name.fullname; | |
1435 | } else if (b->type == 1) { | |
1436 | if (!b->dpname) | |
1437 | return 0; | |
1438 | /* Case 2: set name and GENERAL_NAMES appropriately */ | |
1439 | gens = a->name.fullname; | |
1440 | nm = b->dpname; | |
1441 | } | |
1442 | ||
1443 | /* Handle case 2 with one GENERAL_NAMES and one X509_NAME */ | |
1444 | if (nm) { | |
1445 | for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) { | |
1446 | gena = sk_GENERAL_NAME_value(gens, i); | |
1447 | if (gena->type != GEN_DIRNAME) | |
1448 | continue; | |
1449 | if (!X509_NAME_cmp(nm, gena->d.directoryName)) | |
1450 | return 1; | |
1451 | } | |
1452 | return 0; | |
1453 | } | |
1454 | ||
1455 | /* Else case 3: two GENERAL_NAMES */ | |
1456 | ||
1457 | for (i = 0; i < sk_GENERAL_NAME_num(a->name.fullname); i++) { | |
1458 | gena = sk_GENERAL_NAME_value(a->name.fullname, i); | |
1459 | for (j = 0; j < sk_GENERAL_NAME_num(b->name.fullname); j++) { | |
1460 | genb = sk_GENERAL_NAME_value(b->name.fullname, j); | |
1461 | if (!GENERAL_NAME_cmp(gena, genb)) | |
1462 | return 1; | |
1463 | } | |
1464 | } | |
1465 | ||
1466 | return 0; | |
1467 | ||
1468 | } | |
bc7535bc | 1469 | |
4b96839f | 1470 | static int crldp_check_crlissuer(DIST_POINT *dp, X509_CRL *crl, int crl_score) |
0f113f3e MC |
1471 | { |
1472 | int i; | |
8cc86b81 | 1473 | const X509_NAME *nm = X509_CRL_get_issuer(crl); |
0f113f3e MC |
1474 | /* If no CRLissuer return is successful iff don't need a match */ |
1475 | if (!dp->CRLissuer) | |
1476 | return ! !(crl_score & CRL_SCORE_ISSUER_NAME); | |
1477 | for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++) { | |
1478 | GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i); | |
1479 | if (gen->type != GEN_DIRNAME) | |
1480 | continue; | |
1481 | if (!X509_NAME_cmp(gen->d.directoryName, nm)) | |
1482 | return 1; | |
1483 | } | |
1484 | return 0; | |
1485 | } | |
d0fff69d | 1486 | |
4b96839f | 1487 | /* Check CRLDP and IDP */ |
bc7535bc | 1488 | |
4b96839f | 1489 | static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score, |
0f113f3e MC |
1490 | unsigned int *preasons) |
1491 | { | |
1492 | int i; | |
1493 | if (crl->idp_flags & IDP_ONLYATTR) | |
1494 | return 0; | |
1495 | if (x->ex_flags & EXFLAG_CA) { | |
1496 | if (crl->idp_flags & IDP_ONLYUSER) | |
1497 | return 0; | |
1498 | } else { | |
1499 | if (crl->idp_flags & IDP_ONLYCA) | |
1500 | return 0; | |
1501 | } | |
1502 | *preasons = crl->idp_reasons; | |
1503 | for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++) { | |
1504 | DIST_POINT *dp = sk_DIST_POINT_value(x->crldp, i); | |
1505 | if (crldp_check_crlissuer(dp, crl, crl_score)) { | |
1506 | if (!crl->idp || idp_check_dp(dp->distpoint, crl->idp->distpoint)) { | |
1507 | *preasons &= dp->dp_reasons; | |
1508 | return 1; | |
1509 | } | |
1510 | } | |
1511 | } | |
1512 | if ((!crl->idp || !crl->idp->distpoint) | |
1513 | && (crl_score & CRL_SCORE_ISSUER_NAME)) | |
1514 | return 1; | |
1515 | return 0; | |
1516 | } | |
1517 | ||
1518 | /* | |
1519 | * Retrieve CRL corresponding to current certificate. If deltas enabled try | |
1520 | * to find a delta CRL too | |
b545dc67 | 1521 | */ |
0f113f3e | 1522 | |
d43c4497 | 1523 | static int get_crl_delta(X509_STORE_CTX *ctx, |
0f113f3e MC |
1524 | X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x) |
1525 | { | |
1526 | int ok; | |
1527 | X509 *issuer = NULL; | |
1528 | int crl_score = 0; | |
1529 | unsigned int reasons; | |
1530 | X509_CRL *crl = NULL, *dcrl = NULL; | |
1531 | STACK_OF(X509_CRL) *skcrl; | |
8cc86b81 | 1532 | const X509_NAME *nm = X509_get_issuer_name(x); |
70dd3c65 | 1533 | |
0f113f3e MC |
1534 | reasons = ctx->current_reasons; |
1535 | ok = get_crl_sk(ctx, &crl, &dcrl, | |
1536 | &issuer, &crl_score, &reasons, ctx->crls); | |
0f113f3e MC |
1537 | if (ok) |
1538 | goto done; | |
1539 | ||
1540 | /* Lookup CRLs from store */ | |
1541 | ||
1542 | skcrl = ctx->lookup_crls(ctx, nm); | |
1543 | ||
1544 | /* If no CRLs found and a near match from get_crl_sk use that */ | |
1545 | if (!skcrl && crl) | |
1546 | goto done; | |
1547 | ||
1548 | get_crl_sk(ctx, &crl, &dcrl, &issuer, &crl_score, &reasons, skcrl); | |
1549 | ||
1550 | sk_X509_CRL_pop_free(skcrl, X509_CRL_free); | |
1551 | ||
1552 | done: | |
0f113f3e MC |
1553 | /* If we got any kind of CRL use it and return success */ |
1554 | if (crl) { | |
1555 | ctx->current_issuer = issuer; | |
1556 | ctx->current_crl_score = crl_score; | |
1557 | ctx->current_reasons = reasons; | |
1558 | *pcrl = crl; | |
1559 | *pdcrl = dcrl; | |
1560 | return 1; | |
1561 | } | |
0f113f3e MC |
1562 | return 0; |
1563 | } | |
b545dc67 DSH |
1564 | |
1565 | /* Check CRL validity */ | |
1566 | static int check_crl(X509_STORE_CTX *ctx, X509_CRL *crl) | |
0f113f3e MC |
1567 | { |
1568 | X509 *issuer = NULL; | |
1569 | EVP_PKEY *ikey = NULL; | |
70dd3c65 VD |
1570 | int cnum = ctx->error_depth; |
1571 | int chnum = sk_X509_num(ctx->chain) - 1; | |
1572 | ||
ade08735 | 1573 | /* If we have an alternative CRL issuer cert use that */ |
0f113f3e MC |
1574 | if (ctx->current_issuer) |
1575 | issuer = ctx->current_issuer; | |
0f113f3e MC |
1576 | /* |
1577 | * Else find CRL issuer: if not last certificate then issuer is next | |
1578 | * certificate in chain. | |
1579 | */ | |
1580 | else if (cnum < chnum) | |
1581 | issuer = sk_X509_value(ctx->chain, cnum + 1); | |
1582 | else { | |
1583 | issuer = sk_X509_value(ctx->chain, chnum); | |
ade08735 | 1584 | /* If not self-issued, can't check signature */ |
70dd3c65 VD |
1585 | if (!ctx->check_issued(ctx, issuer, issuer) && |
1586 | !verify_cb_crl(ctx, X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER)) | |
1587 | return 0; | |
0f113f3e MC |
1588 | } |
1589 | ||
70dd3c65 VD |
1590 | if (issuer == NULL) |
1591 | return 1; | |
0f113f3e | 1592 | |
70dd3c65 VD |
1593 | /* |
1594 | * Skip most tests for deltas because they have already been done | |
1595 | */ | |
1596 | if (!crl->base_crl_number) { | |
1597 | /* Check for cRLSign bit if keyUsage present */ | |
1598 | if ((issuer->ex_flags & EXFLAG_KUSAGE) && | |
1599 | !(issuer->ex_kusage & KU_CRL_SIGN) && | |
1600 | !verify_cb_crl(ctx, X509_V_ERR_KEYUSAGE_NO_CRL_SIGN)) | |
1601 | return 0; | |
0f113f3e | 1602 | |
70dd3c65 VD |
1603 | if (!(ctx->current_crl_score & CRL_SCORE_SCOPE) && |
1604 | !verify_cb_crl(ctx, X509_V_ERR_DIFFERENT_CRL_SCOPE)) | |
1605 | return 0; | |
0f113f3e | 1606 | |
70dd3c65 VD |
1607 | if (!(ctx->current_crl_score & CRL_SCORE_SAME_PATH) && |
1608 | check_crl_path(ctx, ctx->current_issuer) <= 0 && | |
1609 | !verify_cb_crl(ctx, X509_V_ERR_CRL_PATH_VALIDATION_ERROR)) | |
1610 | return 0; | |
0f113f3e | 1611 | |
70dd3c65 VD |
1612 | if ((crl->idp_flags & IDP_INVALID) && |
1613 | !verify_cb_crl(ctx, X509_V_ERR_INVALID_EXTENSION)) | |
1614 | return 0; | |
1615 | } | |
0f113f3e | 1616 | |
70dd3c65 VD |
1617 | if (!(ctx->current_crl_score & CRL_SCORE_TIME) && |
1618 | !check_crl_time(ctx, crl, 1)) | |
1619 | return 0; | |
0f113f3e | 1620 | |
70dd3c65 VD |
1621 | /* Attempt to get issuer certificate public key */ |
1622 | ikey = X509_get0_pubkey(issuer); | |
0f113f3e | 1623 | |
70dd3c65 VD |
1624 | if (!ikey && |
1625 | !verify_cb_crl(ctx, X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY)) | |
1626 | return 0; | |
0f113f3e | 1627 | |
70dd3c65 VD |
1628 | if (ikey) { |
1629 | int rv = X509_CRL_check_suiteb(crl, ikey, ctx->param->flags); | |
0f113f3e | 1630 | |
70dd3c65 VD |
1631 | if (rv != X509_V_OK && !verify_cb_crl(ctx, rv)) |
1632 | return 0; | |
1633 | /* Verify CRL signature */ | |
1634 | if (X509_CRL_verify(crl, ikey) <= 0 && | |
1635 | !verify_cb_crl(ctx, X509_V_ERR_CRL_SIGNATURE_FAILURE)) | |
1636 | return 0; | |
1637 | } | |
1638 | return 1; | |
0f113f3e | 1639 | } |
b545dc67 DSH |
1640 | |
1641 | /* Check certificate against CRL */ | |
1642 | static int cert_crl(X509_STORE_CTX *ctx, X509_CRL *crl, X509 *x) | |
0f113f3e | 1643 | { |
0f113f3e | 1644 | X509_REVOKED *rev; |
70dd3c65 | 1645 | |
0f113f3e MC |
1646 | /* |
1647 | * The rules changed for this... previously if a CRL contained unhandled | |
1648 | * critical extensions it could still be used to indicate a certificate | |
70dd3c65 | 1649 | * was revoked. This has since been changed since critical extensions can |
0f113f3e MC |
1650 | * change the meaning of CRL entries. |
1651 | */ | |
1652 | if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL) | |
70dd3c65 VD |
1653 | && (crl->flags & EXFLAG_CRITICAL) && |
1654 | !verify_cb_crl(ctx, X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION)) | |
1655 | return 0; | |
0f113f3e | 1656 | /* |
70dd3c65 VD |
1657 | * Look for serial number of certificate in CRL. If found, make sure |
1658 | * reason is not removeFromCRL. | |
0f113f3e MC |
1659 | */ |
1660 | if (X509_CRL_get0_by_cert(crl, &rev, x)) { | |
1661 | if (rev->reason == CRL_REASON_REMOVE_FROM_CRL) | |
1662 | return 2; | |
70dd3c65 | 1663 | if (!verify_cb_crl(ctx, X509_V_ERR_CERT_REVOKED)) |
0f113f3e MC |
1664 | return 0; |
1665 | } | |
1666 | ||
1667 | return 1; | |
1668 | } | |
b545dc67 | 1669 | |
5d7c222d | 1670 | static int check_policy(X509_STORE_CTX *ctx) |
0f113f3e MC |
1671 | { |
1672 | int ret; | |
3921ded7 | 1673 | |
0f113f3e MC |
1674 | if (ctx->parent) |
1675 | return 1; | |
3921ded7 VD |
1676 | /* |
1677 | * With DANE, the trust anchor might be a bare public key, not a | |
1678 | * certificate! In that case our chain does not have the trust anchor | |
1679 | * certificate as a top-most element. This comports well with RFC5280 | |
1680 | * chain verification, since there too, the trust anchor is not part of the | |
1681 | * chain to be verified. In particular, X509_policy_check() does not look | |
1682 | * at the TA cert, but assumes that it is present as the top-most chain | |
1683 | * element. We therefore temporarily push a NULL cert onto the chain if it | |
1684 | * was verified via a bare public key, and pop it off right after the | |
1685 | * X509_policy_check() call. | |
1686 | */ | |
1687 | if (ctx->bare_ta_signed && !sk_X509_push(ctx->chain, NULL)) { | |
1688 | X509err(X509_F_CHECK_POLICY, ERR_R_MALLOC_FAILURE); | |
f3e235ed | 1689 | ctx->error = X509_V_ERR_OUT_OF_MEM; |
3921ded7 VD |
1690 | return 0; |
1691 | } | |
0f113f3e MC |
1692 | ret = X509_policy_check(&ctx->tree, &ctx->explicit_policy, ctx->chain, |
1693 | ctx->param->policies, ctx->param->flags); | |
3921ded7 | 1694 | if (ctx->bare_ta_signed) |
225c9660 | 1695 | (void)sk_X509_pop(ctx->chain); |
3921ded7 | 1696 | |
895c2f84 | 1697 | if (ret == X509_PCY_TREE_INTERNAL) { |
0f113f3e | 1698 | X509err(X509_F_CHECK_POLICY, ERR_R_MALLOC_FAILURE); |
f3e235ed | 1699 | ctx->error = X509_V_ERR_OUT_OF_MEM; |
0f113f3e MC |
1700 | return 0; |
1701 | } | |
1702 | /* Invalid or inconsistent extensions */ | |
895c2f84 | 1703 | if (ret == X509_PCY_TREE_INVALID) { |
0f113f3e | 1704 | int i; |
70dd3c65 VD |
1705 | |
1706 | /* Locate certificates with bad extensions and notify callback. */ | |
0f113f3e | 1707 | for (i = 1; i < sk_X509_num(ctx->chain); i++) { |
70dd3c65 VD |
1708 | X509 *x = sk_X509_value(ctx->chain, i); |
1709 | ||
0f113f3e MC |
1710 | if (!(x->ex_flags & EXFLAG_INVALID_POLICY)) |
1711 | continue; | |
70dd3c65 VD |
1712 | if (!verify_cb_cert(ctx, x, i, |
1713 | X509_V_ERR_INVALID_POLICY_EXTENSION)) | |
0f113f3e MC |
1714 | return 0; |
1715 | } | |
1716 | return 1; | |
1717 | } | |
895c2f84 | 1718 | if (ret == X509_PCY_TREE_FAILURE) { |
0f113f3e MC |
1719 | ctx->current_cert = NULL; |
1720 | ctx->error = X509_V_ERR_NO_EXPLICIT_POLICY; | |
1721 | return ctx->verify_cb(0, ctx); | |
1722 | } | |
895c2f84 VD |
1723 | if (ret != X509_PCY_TREE_VALID) { |
1724 | X509err(X509_F_CHECK_POLICY, ERR_R_INTERNAL_ERROR); | |
1725 | return 0; | |
1726 | } | |
0f113f3e MC |
1727 | |
1728 | if (ctx->param->flags & X509_V_FLAG_NOTIFY_POLICY) { | |
1729 | ctx->current_cert = NULL; | |
f3e235ed VD |
1730 | /* |
1731 | * Verification errors need to be "sticky", a callback may have allowed | |
1732 | * an SSL handshake to continue despite an error, and we must then | |
1733 | * remain in an error state. Therefore, we MUST NOT clear earlier | |
1734 | * verification errors by setting the error to X509_V_OK. | |
1735 | */ | |
0f113f3e MC |
1736 | if (!ctx->verify_cb(2, ctx)) |
1737 | return 0; | |
1738 | } | |
1739 | ||
1740 | return 1; | |
1741 | } | |
5d7c222d | 1742 | |
70dd3c65 VD |
1743 | /*- |
1744 | * Check certificate validity times. | |
1745 | * If depth >= 0, invoke verification callbacks on error, otherwise just return | |
1746 | * the validation status. | |
1747 | * | |
1748 | * Return 1 on success, 0 otherwise. | |
1749 | */ | |
1750 | int x509_check_cert_time(X509_STORE_CTX *ctx, X509 *x, int depth) | |
0f113f3e MC |
1751 | { |
1752 | time_t *ptime; | |
1753 | int i; | |
1754 | ||
1755 | if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME) | |
1756 | ptime = &ctx->param->check_time; | |
d35ff2c0 DW |
1757 | else if (ctx->param->flags & X509_V_FLAG_NO_CHECK_TIME) |
1758 | return 1; | |
0f113f3e MC |
1759 | else |
1760 | ptime = NULL; | |
1761 | ||
568ce3a5 | 1762 | i = X509_cmp_time(X509_get0_notBefore(x), ptime); |
70dd3c65 VD |
1763 | if (i >= 0 && depth < 0) |
1764 | return 0; | |
1765 | if (i == 0 && !verify_cb_cert(ctx, x, depth, | |
1766 | X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD)) | |
1767 | return 0; | |
1768 | if (i > 0 && !verify_cb_cert(ctx, x, depth, X509_V_ERR_CERT_NOT_YET_VALID)) | |
1769 | return 0; | |
0f113f3e | 1770 | |
568ce3a5 | 1771 | i = X509_cmp_time(X509_get0_notAfter(x), ptime); |
70dd3c65 VD |
1772 | if (i <= 0 && depth < 0) |
1773 | return 0; | |
1774 | if (i == 0 && !verify_cb_cert(ctx, x, depth, | |
1775 | X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD)) | |
1776 | return 0; | |
1777 | if (i < 0 && !verify_cb_cert(ctx, x, depth, X509_V_ERR_CERT_HAS_EXPIRED)) | |
1778 | return 0; | |
0f113f3e MC |
1779 | return 1; |
1780 | } | |
e1a27eb3 | 1781 | |
0b670a21 | 1782 | /* verify the issuer signatures and cert times of ctx->chain */ |
6b691a5c | 1783 | static int internal_verify(X509_STORE_CTX *ctx) |
0f113f3e | 1784 | { |
70dd3c65 VD |
1785 | int n = sk_X509_num(ctx->chain) - 1; |
1786 | X509 *xi = sk_X509_value(ctx->chain, n); | |
1787 | X509 *xs; | |
0f113f3e | 1788 | |
170b7358 VD |
1789 | /* |
1790 | * With DANE-verified bare public key TA signatures, it remains only to | |
1791 | * check the timestamps of the top certificate. We report the issuer as | |
1792 | * NULL, since all we have is a bare key. | |
1793 | */ | |
1794 | if (ctx->bare_ta_signed) { | |
1795 | xs = xi; | |
1796 | xi = NULL; | |
0b670a21 | 1797 | goto check_cert_time; |
170b7358 VD |
1798 | } |
1799 | ||
0b670a21 DDO |
1800 | if (ctx->check_issued(ctx, xi, xi)) |
1801 | xs = xi; /* the typical case: last cert in the chain is self-issued */ | |
0f113f3e MC |
1802 | else { |
1803 | if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN) { | |
1804 | xs = xi; | |
0b670a21 | 1805 | goto check_cert_time; |
0f113f3e | 1806 | } |
02a25671 AK |
1807 | if (n <= 0) { |
1808 | if (!verify_cb_cert(ctx, xi, 0, | |
1809 | X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE)) | |
1810 | return 0; | |
1811 | ||
1812 | xs = xi; | |
1813 | goto check_cert_time; | |
1814 | } | |
1815 | ||
70dd3c65 VD |
1816 | n--; |
1817 | ctx->error_depth = n; | |
1818 | xs = sk_X509_value(ctx->chain, n); | |
0f113f3e MC |
1819 | } |
1820 | ||
d9b8b89b VD |
1821 | /* |
1822 | * Do not clear ctx->error=0, it must be "sticky", only the user's callback | |
1823 | * is allowed to reset errors (at its own peril). | |
1824 | */ | |
0f113f3e | 1825 | while (n >= 0) { |
0f113f3e | 1826 | /* |
0b670a21 DDO |
1827 | * For each iteration of this loop: |
1828 | * n is the subject depth | |
1829 | * xs is the subject cert, for which the signature is to be checked | |
1830 | * xi is the supposed issuer cert containing the public key to use | |
1831 | * Initially xs == xi if the last cert in the chain is self-issued. | |
1832 | * | |
ade08735 DDO |
1833 | * Skip signature check for self-signed certificates unless explicitly |
1834 | * asked for because it does not add any security and just wastes time. | |
0f113f3e | 1835 | */ |
0b670a21 DDO |
1836 | if (xs != xi || ((ctx->param->flags & X509_V_FLAG_CHECK_SS_SIGNATURE) |
1837 | && (xi->ex_flags & EXFLAG_SS) != 0)) { | |
02369787 | 1838 | EVP_PKEY *pkey; |
0b670a21 DDO |
1839 | /* |
1840 | * If the issuer's public key is not available or its key usage | |
1841 | * does not support issuing the subject cert, report the issuer | |
1842 | * cert and its depth (rather than n, the depth of the subject). | |
1843 | */ | |
1844 | int issuer_depth = n + (xs == xi ? 0 : 1); | |
1845 | /* | |
1846 | * According to https://tools.ietf.org/html/rfc5280#section-6.1.4 | |
1847 | * step (n) we must check any given key usage extension in a CA cert | |
1848 | * when preparing the verification of a certificate issued by it. | |
1849 | * According to https://tools.ietf.org/html/rfc5280#section-4.2.1.3 | |
1850 | * we must not verify a certifiate signature if the key usage of the | |
1851 | * CA certificate that issued the certificate prohibits signing. | |
1852 | * In case the 'issuing' certificate is the last in the chain and is | |
1853 | * not a CA certificate but a 'self-issued' end-entity cert (i.e., | |
1854 | * xs == xi && !(xi->ex_flags & EXFLAG_CA)) RFC 5280 does not apply | |
1855 | * (see https://tools.ietf.org/html/rfc6818#section-2) and thus | |
1856 | * we are free to ignore any key usage restrictions on such certs. | |
1857 | */ | |
1858 | int ret = xs == xi && (xi->ex_flags & EXFLAG_CA) == 0 | |
1859 | ? X509_V_OK : x509_signing_allowed(xi, xs); | |
02369787 | 1860 | |
0e7b1383 DDO |
1861 | if (ret != X509_V_OK && !verify_cb_cert(ctx, xi, issuer_depth, ret)) |
1862 | return 0; | |
c01ff880 | 1863 | if ((pkey = X509_get0_pubkey(xi)) == NULL) { |
0b670a21 DDO |
1864 | ret = X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY; |
1865 | if (!verify_cb_cert(ctx, xi, issuer_depth, ret)) | |
70dd3c65 | 1866 | return 0; |
6725682d | 1867 | } else if (X509_verify(xs, pkey) <= 0) { |
0b670a21 DDO |
1868 | ret = X509_V_ERR_CERT_SIGNATURE_FAILURE; |
1869 | if (!verify_cb_cert(ctx, xs, n, ret)) | |
70dd3c65 | 1870 | return 0; |
0f113f3e | 1871 | } |
0f113f3e MC |
1872 | } |
1873 | ||
0b670a21 | 1874 | check_cert_time: |
70dd3c65 VD |
1875 | /* Calls verify callback as needed */ |
1876 | if (!x509_check_cert_time(ctx, xs, n)) | |
1877 | return 0; | |
0f113f3e | 1878 | |
70dd3c65 VD |
1879 | /* |
1880 | * Signal success at this depth. However, the previous error (if any) | |
1881 | * is retained. | |
1882 | */ | |
0f113f3e MC |
1883 | ctx->current_issuer = xi; |
1884 | ctx->current_cert = xs; | |
70dd3c65 VD |
1885 | ctx->error_depth = n; |
1886 | if (!ctx->verify_cb(1, ctx)) | |
1887 | return 0; | |
0f113f3e | 1888 | |
70dd3c65 | 1889 | if (--n >= 0) { |
0f113f3e MC |
1890 | xi = xs; |
1891 | xs = sk_X509_value(ctx->chain, n); | |
1892 | } | |
1893 | } | |
70dd3c65 | 1894 | return 1; |
0f113f3e | 1895 | } |
d02b48c6 | 1896 | |
91b73acb | 1897 | int X509_cmp_current_time(const ASN1_TIME *ctm) |
bbb72003 | 1898 | { |
0f113f3e | 1899 | return X509_cmp_time(ctm, NULL); |
bbb72003 DSH |
1900 | } |
1901 | ||
91b73acb | 1902 | int X509_cmp_time(const ASN1_TIME *ctm, time_t *cmp_time) |
0f113f3e | 1903 | { |
80770da3 EK |
1904 | static const size_t utctime_length = sizeof("YYMMDDHHMMSSZ") - 1; |
1905 | static const size_t generalizedtime_length = sizeof("YYYYMMDDHHMMSSZ") - 1; | |
1906 | ASN1_TIME *asn1_cmp_time = NULL; | |
1907 | int i, day, sec, ret = 0; | |
48102247 | 1908 | #ifdef CHARSET_EBCDIC |
1909 | const char upper_z = 0x5A; | |
1910 | #else | |
1911 | const char upper_z = 'Z'; | |
1912 | #endif | |
f48b83b4 | 1913 | /* |
80770da3 EK |
1914 | * Note that ASN.1 allows much more slack in the time format than RFC5280. |
1915 | * In RFC5280, the representation is fixed: | |
f48b83b4 EK |
1916 | * UTCTime: YYMMDDHHMMSSZ |
1917 | * GeneralizedTime: YYYYMMDDHHMMSSZ | |
80770da3 EK |
1918 | * |
1919 | * We do NOT currently enforce the following RFC 5280 requirement: | |
1920 | * "CAs conforming to this profile MUST always encode certificate | |
1921 | * validity dates through the year 2049 as UTCTime; certificate validity | |
1922 | * dates in 2050 or later MUST be encoded as GeneralizedTime." | |
f48b83b4 | 1923 | */ |
80770da3 EK |
1924 | switch (ctm->type) { |
1925 | case V_ASN1_UTCTIME: | |
1926 | if (ctm->length != (int)(utctime_length)) | |
0f113f3e | 1927 | return 0; |
80770da3 EK |
1928 | break; |
1929 | case V_ASN1_GENERALIZEDTIME: | |
1930 | if (ctm->length != (int)(generalizedtime_length)) | |
0f113f3e | 1931 | return 0; |
80770da3 EK |
1932 | break; |
1933 | default: | |
1934 | return 0; | |
0f113f3e MC |
1935 | } |
1936 | ||
80770da3 EK |
1937 | /** |
1938 | * Verify the format: the ASN.1 functions we use below allow a more | |
1939 | * flexible format than what's mandated by RFC 5280. | |
1940 | * Digit and date ranges will be verified in the conversion methods. | |
1941 | */ | |
1942 | for (i = 0; i < ctm->length - 1; i++) { | |
48102247 | 1943 | if (!ascii_isdigit(ctm->data[i])) |
f48b83b4 | 1944 | return 0; |
0f113f3e | 1945 | } |
48102247 | 1946 | if (ctm->data[ctm->length - 1] != upper_z) |
f48b83b4 | 1947 | return 0; |
0f113f3e | 1948 | |
80770da3 EK |
1949 | /* |
1950 | * There is ASN1_UTCTIME_cmp_time_t but no | |
1951 | * ASN1_GENERALIZEDTIME_cmp_time_t or ASN1_TIME_cmp_time_t, | |
1952 | * so we go through ASN.1 | |
1953 | */ | |
1954 | asn1_cmp_time = X509_time_adj(NULL, 0, cmp_time); | |
1955 | if (asn1_cmp_time == NULL) | |
1956 | goto err; | |
1957 | if (!ASN1_TIME_diff(&day, &sec, ctm, asn1_cmp_time)) | |
1958 | goto err; | |
0f113f3e | 1959 | |
80770da3 EK |
1960 | /* |
1961 | * X509_cmp_time comparison is <=. | |
1962 | * The return value 0 is reserved for errors. | |
1963 | */ | |
1964 | ret = (day >= 0 && sec >= 0) ? -1 : 1; | |
1965 | ||
1966 | err: | |
1967 | ASN1_TIME_free(asn1_cmp_time); | |
1968 | return ret; | |
0f113f3e | 1969 | } |
d02b48c6 | 1970 | |
25d7cd1d DDO |
1971 | /* |
1972 | * Return 0 if time should not be checked or reference time is in range, | |
1973 | * or else 1 if it is past the end, or -1 if it is before the start | |
1974 | */ | |
1975 | int X509_cmp_timeframe(const X509_VERIFY_PARAM *vpm, | |
1976 | const ASN1_TIME *start, const ASN1_TIME *end) | |
1977 | { | |
1978 | time_t ref_time; | |
1979 | time_t *time = NULL; | |
1980 | unsigned long flags = vpm == NULL ? 0 : X509_VERIFY_PARAM_get_flags(vpm); | |
1981 | ||
1982 | if ((flags & X509_V_FLAG_USE_CHECK_TIME) != 0) { | |
1983 | ref_time = X509_VERIFY_PARAM_get_time(vpm); | |
1984 | time = &ref_time; | |
1985 | } else if ((flags & X509_V_FLAG_NO_CHECK_TIME) != 0) { | |
1986 | return 0; /* this means ok */ | |
1987 | } /* else reference time is the current time */ | |
1988 | ||
1989 | if (end != NULL && X509_cmp_time(end, time) < 0) | |
1990 | return 1; | |
1991 | if (start != NULL && X509_cmp_time(start, time) > 0) | |
1992 | return -1; | |
1993 | return 0; | |
1994 | } | |
1995 | ||
284ef5f3 | 1996 | ASN1_TIME *X509_gmtime_adj(ASN1_TIME *s, long adj) |
bbb72003 | 1997 | { |
0f113f3e | 1998 | return X509_time_adj(s, adj, NULL); |
bbb72003 DSH |
1999 | } |
2000 | ||
87d3a0cd | 2001 | ASN1_TIME *X509_time_adj(ASN1_TIME *s, long offset_sec, time_t *in_tm) |
0f113f3e MC |
2002 | { |
2003 | return X509_time_adj_ex(s, 0, offset_sec, in_tm); | |
2004 | } | |
87d3a0cd DSH |
2005 | |
2006 | ASN1_TIME *X509_time_adj_ex(ASN1_TIME *s, | |
0f113f3e MC |
2007 | int offset_day, long offset_sec, time_t *in_tm) |
2008 | { | |
2009 | time_t t; | |
2010 | ||
2011 | if (in_tm) | |
2012 | t = *in_tm; | |
2013 | else | |
2014 | time(&t); | |
2015 | ||
2016 | if (s && !(s->flags & ASN1_STRING_FLAG_MSTRING)) { | |
2017 | if (s->type == V_ASN1_UTCTIME) | |
2018 | return ASN1_UTCTIME_adj(s, t, offset_day, offset_sec); | |
2019 | if (s->type == V_ASN1_GENERALIZEDTIME) | |
2020 | return ASN1_GENERALIZEDTIME_adj(s, t, offset_day, offset_sec); | |
2021 | } | |
2022 | return ASN1_TIME_adj(s, t, offset_day, offset_sec); | |
2023 | } | |
d02b48c6 | 2024 | |
7e258a56 | 2025 | int X509_get_pubkey_parameters(EVP_PKEY *pkey, STACK_OF(X509) *chain) |
0f113f3e MC |
2026 | { |
2027 | EVP_PKEY *ktmp = NULL, *ktmp2; | |
2028 | int i, j; | |
2029 | ||
2030 | if ((pkey != NULL) && !EVP_PKEY_missing_parameters(pkey)) | |
2031 | return 1; | |
2032 | ||
2033 | for (i = 0; i < sk_X509_num(chain); i++) { | |
c01ff880 | 2034 | ktmp = X509_get0_pubkey(sk_X509_value(chain, i)); |
0f113f3e MC |
2035 | if (ktmp == NULL) { |
2036 | X509err(X509_F_X509_GET_PUBKEY_PARAMETERS, | |
2037 | X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY); | |
2038 | return 0; | |
2039 | } | |
2040 | if (!EVP_PKEY_missing_parameters(ktmp)) | |
2041 | break; | |
0f113f3e MC |
2042 | } |
2043 | if (ktmp == NULL) { | |
2044 | X509err(X509_F_X509_GET_PUBKEY_PARAMETERS, | |
2045 | X509_R_UNABLE_TO_FIND_PARAMETERS_IN_CHAIN); | |
2046 | return 0; | |
2047 | } | |
2048 | ||
2049 | /* first, populate the other certs */ | |
2050 | for (j = i - 1; j >= 0; j--) { | |
c01ff880 | 2051 | ktmp2 = X509_get0_pubkey(sk_X509_value(chain, j)); |
0f113f3e | 2052 | EVP_PKEY_copy_parameters(ktmp2, ktmp); |
0f113f3e MC |
2053 | } |
2054 | ||
2055 | if (pkey != NULL) | |
2056 | EVP_PKEY_copy_parameters(pkey, ktmp); | |
0f113f3e MC |
2057 | return 1; |
2058 | } | |
d02b48c6 | 2059 | |
2e8cb108 DSH |
2060 | /* Make a delta CRL as the diff between two full CRLs */ |
2061 | ||
2062 | X509_CRL *X509_CRL_diff(X509_CRL *base, X509_CRL *newer, | |
0f113f3e MC |
2063 | EVP_PKEY *skey, const EVP_MD *md, unsigned int flags) |
2064 | { | |
2065 | X509_CRL *crl = NULL; | |
2066 | int i; | |
2067 | STACK_OF(X509_REVOKED) *revs = NULL; | |
2068 | /* CRLs can't be delta already */ | |
2069 | if (base->base_crl_number || newer->base_crl_number) { | |
2070 | X509err(X509_F_X509_CRL_DIFF, X509_R_CRL_ALREADY_DELTA); | |
2071 | return NULL; | |
2072 | } | |
2073 | /* Base and new CRL must have a CRL number */ | |
2074 | if (!base->crl_number || !newer->crl_number) { | |
2075 | X509err(X509_F_X509_CRL_DIFF, X509_R_NO_CRL_NUMBER); | |
2076 | return NULL; | |
2077 | } | |
2078 | /* Issuer names must match */ | |
2079 | if (X509_NAME_cmp(X509_CRL_get_issuer(base), X509_CRL_get_issuer(newer))) { | |
2080 | X509err(X509_F_X509_CRL_DIFF, X509_R_ISSUER_MISMATCH); | |
2081 | return NULL; | |
2082 | } | |
2083 | /* AKID and IDP must match */ | |
2084 | if (!crl_extension_match(base, newer, NID_authority_key_identifier)) { | |
2085 | X509err(X509_F_X509_CRL_DIFF, X509_R_AKID_MISMATCH); | |
2086 | return NULL; | |
2087 | } | |
2088 | if (!crl_extension_match(base, newer, NID_issuing_distribution_point)) { | |
2089 | X509err(X509_F_X509_CRL_DIFF, X509_R_IDP_MISMATCH); | |
2090 | return NULL; | |
2091 | } | |
2092 | /* Newer CRL number must exceed full CRL number */ | |
2093 | if (ASN1_INTEGER_cmp(newer->crl_number, base->crl_number) <= 0) { | |
2094 | X509err(X509_F_X509_CRL_DIFF, X509_R_NEWER_CRL_NOT_NEWER); | |
2095 | return NULL; | |
2096 | } | |
2097 | /* CRLs must verify */ | |
2098 | if (skey && (X509_CRL_verify(base, skey) <= 0 || | |
2099 | X509_CRL_verify(newer, skey) <= 0)) { | |
2100 | X509err(X509_F_X509_CRL_DIFF, X509_R_CRL_VERIFY_FAILURE); | |
2101 | return NULL; | |
2102 | } | |
2103 | /* Create new CRL */ | |
2104 | crl = X509_CRL_new(); | |
90945fa3 | 2105 | if (crl == NULL || !X509_CRL_set_version(crl, 1)) |
0f113f3e MC |
2106 | goto memerr; |
2107 | /* Set issuer name */ | |
2108 | if (!X509_CRL_set_issuer_name(crl, X509_CRL_get_issuer(newer))) | |
2109 | goto memerr; | |
2110 | ||
568ce3a5 | 2111 | if (!X509_CRL_set1_lastUpdate(crl, X509_CRL_get0_lastUpdate(newer))) |
0f113f3e | 2112 | goto memerr; |
568ce3a5 | 2113 | if (!X509_CRL_set1_nextUpdate(crl, X509_CRL_get0_nextUpdate(newer))) |
0f113f3e MC |
2114 | goto memerr; |
2115 | ||
2116 | /* Set base CRL number: must be critical */ | |
2117 | ||
2118 | if (!X509_CRL_add1_ext_i2d(crl, NID_delta_crl, base->crl_number, 1, 0)) | |
2119 | goto memerr; | |
2120 | ||
2121 | /* | |
2122 | * Copy extensions across from newest CRL to delta: this will set CRL | |
2123 | * number to correct value too. | |
2124 | */ | |
2125 | ||
2126 | for (i = 0; i < X509_CRL_get_ext_count(newer); i++) { | |
2127 | X509_EXTENSION *ext; | |
2128 | ext = X509_CRL_get_ext(newer, i); | |
2129 | if (!X509_CRL_add_ext(crl, ext, -1)) | |
2130 | goto memerr; | |
2131 | } | |
2132 | ||
2133 | /* Go through revoked entries, copying as needed */ | |
2134 | ||
2135 | revs = X509_CRL_get_REVOKED(newer); | |
2136 | ||
2137 | for (i = 0; i < sk_X509_REVOKED_num(revs); i++) { | |
2138 | X509_REVOKED *rvn, *rvtmp; | |
2139 | rvn = sk_X509_REVOKED_value(revs, i); | |
2140 | /* | |
2141 | * Add only if not also in base. TODO: need something cleverer here | |
2142 | * for some more complex CRLs covering multiple CAs. | |
2143 | */ | |
34a42e14 | 2144 | if (!X509_CRL_get0_by_serial(base, &rvtmp, &rvn->serialNumber)) { |
0f113f3e MC |
2145 | rvtmp = X509_REVOKED_dup(rvn); |
2146 | if (!rvtmp) | |
2147 | goto memerr; | |
2148 | if (!X509_CRL_add0_revoked(crl, rvtmp)) { | |
2149 | X509_REVOKED_free(rvtmp); | |
2150 | goto memerr; | |
2151 | } | |
2152 | } | |
2153 | } | |
2154 | /* TODO: optionally prune deleted entries */ | |
2155 | ||
2156 | if (skey && md && !X509_CRL_sign(crl, skey, md)) | |
2157 | goto memerr; | |
2158 | ||
2159 | return crl; | |
2160 | ||
2161 | memerr: | |
2162 | X509err(X509_F_X509_CRL_DIFF, ERR_R_MALLOC_FAILURE); | |
222561fe | 2163 | X509_CRL_free(crl); |
0f113f3e MC |
2164 | return NULL; |
2165 | } | |
2166 | ||
6b691a5c | 2167 | int X509_STORE_CTX_set_ex_data(X509_STORE_CTX *ctx, int idx, void *data) |
0f113f3e MC |
2168 | { |
2169 | return CRYPTO_set_ex_data(&ctx->ex_data, idx, data); | |
2170 | } | |
58964a49 | 2171 | |
8cc86b81 | 2172 | void *X509_STORE_CTX_get_ex_data(const X509_STORE_CTX *ctx, int idx) |
0f113f3e MC |
2173 | { |
2174 | return CRYPTO_get_ex_data(&ctx->ex_data, idx); | |
2175 | } | |
58964a49 | 2176 | |
8cc86b81 | 2177 | int X509_STORE_CTX_get_error(const X509_STORE_CTX *ctx) |
0f113f3e MC |
2178 | { |
2179 | return ctx->error; | |
2180 | } | |
58964a49 | 2181 | |
6b691a5c | 2182 | void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int err) |
0f113f3e MC |
2183 | { |
2184 | ctx->error = err; | |
2185 | } | |
58964a49 | 2186 | |
8cc86b81 | 2187 | int X509_STORE_CTX_get_error_depth(const X509_STORE_CTX *ctx) |
0f113f3e MC |
2188 | { |
2189 | return ctx->error_depth; | |
2190 | } | |
58964a49 | 2191 | |
51227177 VD |
2192 | void X509_STORE_CTX_set_error_depth(X509_STORE_CTX *ctx, int depth) |
2193 | { | |
2194 | ctx->error_depth = depth; | |
2195 | } | |
2196 | ||
8cc86b81 | 2197 | X509 *X509_STORE_CTX_get_current_cert(const X509_STORE_CTX *ctx) |
0f113f3e MC |
2198 | { |
2199 | return ctx->current_cert; | |
2200 | } | |
58964a49 | 2201 | |
c9654873 VD |
2202 | void X509_STORE_CTX_set_current_cert(X509_STORE_CTX *ctx, X509 *x) |
2203 | { | |
2204 | ctx->current_cert = x; | |
2205 | } | |
2206 | ||
8cc86b81 | 2207 | STACK_OF(X509) *X509_STORE_CTX_get0_chain(const X509_STORE_CTX *ctx) |
0f113f3e MC |
2208 | { |
2209 | return ctx->chain; | |
2210 | } | |
58964a49 | 2211 | |
8cc86b81 | 2212 | STACK_OF(X509) *X509_STORE_CTX_get1_chain(const X509_STORE_CTX *ctx) |
0f113f3e MC |
2213 | { |
2214 | if (!ctx->chain) | |
2215 | return NULL; | |
2216 | return X509_chain_up_ref(ctx->chain); | |
2217 | } | |
25f923dd | 2218 | |
8cc86b81 | 2219 | X509 *X509_STORE_CTX_get0_current_issuer(const X509_STORE_CTX *ctx) |
0f113f3e MC |
2220 | { |
2221 | return ctx->current_issuer; | |
2222 | } | |
2008e714 | 2223 | |
8cc86b81 | 2224 | X509_CRL *X509_STORE_CTX_get0_current_crl(const X509_STORE_CTX *ctx) |
0f113f3e MC |
2225 | { |
2226 | return ctx->current_crl; | |
2227 | } | |
2008e714 | 2228 | |
8cc86b81 | 2229 | X509_STORE_CTX *X509_STORE_CTX_get0_parent_ctx(const X509_STORE_CTX *ctx) |
0f113f3e MC |
2230 | { |
2231 | return ctx->parent; | |
2232 | } | |
2008e714 | 2233 | |
6b691a5c | 2234 | void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x) |
0f113f3e MC |
2235 | { |
2236 | ctx->cert = x; | |
2237 | } | |
58964a49 | 2238 | |
e1a27eb3 | 2239 | void X509_STORE_CTX_set0_crls(X509_STORE_CTX *ctx, STACK_OF(X509_CRL) *sk) |
0f113f3e MC |
2240 | { |
2241 | ctx->crls = sk; | |
2242 | } | |
e1a27eb3 | 2243 | |
13938ace | 2244 | int X509_STORE_CTX_set_purpose(X509_STORE_CTX *ctx, int purpose) |
0f113f3e | 2245 | { |
0daccd4d VD |
2246 | /* |
2247 | * XXX: Why isn't this function always used to set the associated trust? | |
2248 | * Should there even be a VPM->trust field at all? Or should the trust | |
2249 | * always be inferred from the purpose by X509_STORE_CTX_init(). | |
2250 | */ | |
0f113f3e MC |
2251 | return X509_STORE_CTX_purpose_inherit(ctx, 0, purpose, 0); |
2252 | } | |
11262391 | 2253 | |
bb7cd4e3 | 2254 | int X509_STORE_CTX_set_trust(X509_STORE_CTX *ctx, int trust) |
0f113f3e | 2255 | { |
0daccd4d VD |
2256 | /* |
2257 | * XXX: See above, this function would only be needed when the default | |
2258 | * trust for the purpose needs an override in a corner case. | |
2259 | */ | |
0f113f3e MC |
2260 | return X509_STORE_CTX_purpose_inherit(ctx, 0, 0, trust); |
2261 | } | |
2262 | ||
2263 | /* | |
2264 | * This function is used to set the X509_STORE_CTX purpose and trust values. | |
2265 | * This is intended to be used when another structure has its own trust and | |
2266 | * purpose values which (if set) will be inherited by the ctx. If they aren't | |
2267 | * set then we will usually have a default purpose in mind which should then | |
2268 | * be used to set the trust value. An example of this is SSL use: an SSL | |
2269 | * structure will have its own purpose and trust settings which the | |
2270 | * application can set: if they aren't set then we use the default of SSL | |
2271 | * client/server. | |
13938ace DSH |
2272 | */ |
2273 | ||
2274 | int X509_STORE_CTX_purpose_inherit(X509_STORE_CTX *ctx, int def_purpose, | |
0f113f3e MC |
2275 | int purpose, int trust) |
2276 | { | |
2277 | int idx; | |
2278 | /* If purpose not set use default */ | |
12a765a5 | 2279 | if (purpose == 0) |
0f113f3e MC |
2280 | purpose = def_purpose; |
2281 | /* If we have a purpose then check it is valid */ | |
12a765a5 | 2282 | if (purpose != 0) { |
0f113f3e MC |
2283 | X509_PURPOSE *ptmp; |
2284 | idx = X509_PURPOSE_get_by_id(purpose); | |
2285 | if (idx == -1) { | |
2286 | X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT, | |
2287 | X509_R_UNKNOWN_PURPOSE_ID); | |
2288 | return 0; | |
2289 | } | |
2290 | ptmp = X509_PURPOSE_get0(idx); | |
2291 | if (ptmp->trust == X509_TRUST_DEFAULT) { | |
2292 | idx = X509_PURPOSE_get_by_id(def_purpose); | |
0daccd4d VD |
2293 | /* |
2294 | * XXX: In the two callers above def_purpose is always 0, which is | |
2295 | * not a known value, so idx will always be -1. How is the | |
2296 | * X509_TRUST_DEFAULT case actually supposed to be handled? | |
2297 | */ | |
0f113f3e MC |
2298 | if (idx == -1) { |
2299 | X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT, | |
2300 | X509_R_UNKNOWN_PURPOSE_ID); | |
2301 | return 0; | |
2302 | } | |
2303 | ptmp = X509_PURPOSE_get0(idx); | |
2304 | } | |
2305 | /* If trust not set then get from purpose default */ | |
2306 | if (!trust) | |
2307 | trust = ptmp->trust; | |
2308 | } | |
2309 | if (trust) { | |
2310 | idx = X509_TRUST_get_by_id(trust); | |
2311 | if (idx == -1) { | |
2312 | X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT, | |
2313 | X509_R_UNKNOWN_TRUST_ID); | |
2314 | return 0; | |
2315 | } | |
2316 | } | |
2317 | ||
2318 | if (purpose && !ctx->param->purpose) | |
2319 | ctx->param->purpose = purpose; | |
2320 | if (trust && !ctx->param->trust) | |
2321 | ctx->param->trust = trust; | |
2322 | return 1; | |
51630a37 DSH |
2323 | } |
2324 | ||
d8652be0 | 2325 | X509_STORE_CTX *X509_STORE_CTX_new_ex(OPENSSL_CTX *libctx, const char *propq) |
2f043896 | 2326 | { |
b51bce94 | 2327 | X509_STORE_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx)); |
b196e7d9 | 2328 | |
90945fa3 | 2329 | if (ctx == NULL) { |
1143c27b | 2330 | X509err(0, ERR_R_MALLOC_FAILURE); |
0f113f3e MC |
2331 | return NULL; |
2332 | } | |
1143c27b MC |
2333 | |
2334 | ctx->libctx = libctx; | |
2335 | if (propq != NULL) { | |
2336 | ctx->propq = OPENSSL_strdup(propq); | |
2337 | if (ctx->propq == NULL) { | |
2338 | OPENSSL_free(ctx); | |
2339 | X509err(0, ERR_R_MALLOC_FAILURE); | |
2340 | return NULL; | |
2341 | } | |
2342 | } | |
2343 | ||
0f113f3e | 2344 | return ctx; |
2f043896 DSH |
2345 | } |
2346 | ||
1143c27b MC |
2347 | X509_STORE_CTX *X509_STORE_CTX_new(void) |
2348 | { | |
d8652be0 | 2349 | return X509_STORE_CTX_new_ex(NULL, NULL); |
1143c27b MC |
2350 | } |
2351 | ||
2352 | ||
2f043896 DSH |
2353 | void X509_STORE_CTX_free(X509_STORE_CTX *ctx) |
2354 | { | |
c001ce33 | 2355 | if (ctx == NULL) |
222561fe | 2356 | return; |
c001ce33 | 2357 | |
0f113f3e | 2358 | X509_STORE_CTX_cleanup(ctx); |
1143c27b MC |
2359 | |
2360 | /* libctx and propq survive X509_STORE_CTX_cleanup() */ | |
2361 | OPENSSL_free(ctx->propq); | |
2362 | ||
0f113f3e | 2363 | OPENSSL_free(ctx); |
2f043896 DSH |
2364 | } |
2365 | ||
79aa04ef | 2366 | int X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE *store, X509 *x509, |
0f113f3e MC |
2367 | STACK_OF(X509) *chain) |
2368 | { | |
2369 | int ret = 1; | |
ecdaa1ae | 2370 | |
faa9dcd4 | 2371 | ctx->store = store; |
0f113f3e MC |
2372 | ctx->cert = x509; |
2373 | ctx->untrusted = chain; | |
2374 | ctx->crls = NULL; | |
d9b8b89b | 2375 | ctx->num_untrusted = 0; |
0f113f3e MC |
2376 | ctx->other_ctx = NULL; |
2377 | ctx->valid = 0; | |
2378 | ctx->chain = NULL; | |
2379 | ctx->error = 0; | |
2380 | ctx->explicit_policy = 0; | |
2381 | ctx->error_depth = 0; | |
2382 | ctx->current_cert = NULL; | |
2383 | ctx->current_issuer = NULL; | |
2384 | ctx->current_crl = NULL; | |
2385 | ctx->current_crl_score = 0; | |
2386 | ctx->current_reasons = 0; | |
2387 | ctx->tree = NULL; | |
2388 | ctx->parent = NULL; | |
919ba009 | 2389 | ctx->dane = NULL; |
170b7358 | 2390 | ctx->bare_ta_signed = 0; |
e29c73c9 VD |
2391 | /* Zero ex_data to make sure we're cleanup-safe */ |
2392 | memset(&ctx->ex_data, 0, sizeof(ctx->ex_data)); | |
0f113f3e | 2393 | |
7b7eb472 VD |
2394 | /* store->cleanup is always 0 in OpenSSL, if set must be idempotent */ |
2395 | if (store) | |
0f113f3e | 2396 | ctx->cleanup = store->cleanup; |
7b7eb472 | 2397 | else |
0f113f3e MC |
2398 | ctx->cleanup = 0; |
2399 | ||
0f113f3e MC |
2400 | if (store && store->check_issued) |
2401 | ctx->check_issued = store->check_issued; | |
2402 | else | |
2403 | ctx->check_issued = check_issued; | |
2404 | ||
2405 | if (store && store->get_issuer) | |
2406 | ctx->get_issuer = store->get_issuer; | |
2407 | else | |
2408 | ctx->get_issuer = X509_STORE_CTX_get1_issuer; | |
2409 | ||
2410 | if (store && store->verify_cb) | |
2411 | ctx->verify_cb = store->verify_cb; | |
2412 | else | |
2413 | ctx->verify_cb = null_callback; | |
2414 | ||
2415 | if (store && store->verify) | |
2416 | ctx->verify = store->verify; | |
2417 | else | |
2418 | ctx->verify = internal_verify; | |
2419 | ||
2420 | if (store && store->check_revocation) | |
2421 | ctx->check_revocation = store->check_revocation; | |
2422 | else | |
2423 | ctx->check_revocation = check_revocation; | |
2424 | ||
2425 | if (store && store->get_crl) | |
2426 | ctx->get_crl = store->get_crl; | |
311f2785 VD |
2427 | else |
2428 | ctx->get_crl = NULL; | |
0f113f3e MC |
2429 | |
2430 | if (store && store->check_crl) | |
2431 | ctx->check_crl = store->check_crl; | |
2432 | else | |
2433 | ctx->check_crl = check_crl; | |
2434 | ||
2435 | if (store && store->cert_crl) | |
2436 | ctx->cert_crl = store->cert_crl; | |
2437 | else | |
2438 | ctx->cert_crl = cert_crl; | |
2439 | ||
0a5fe2eb RL |
2440 | if (store && store->check_policy) |
2441 | ctx->check_policy = store->check_policy; | |
2442 | else | |
2443 | ctx->check_policy = check_policy; | |
2444 | ||
0f113f3e MC |
2445 | if (store && store->lookup_certs) |
2446 | ctx->lookup_certs = store->lookup_certs; | |
2447 | else | |
6ddbb4cd | 2448 | ctx->lookup_certs = X509_STORE_CTX_get1_certs; |
0f113f3e MC |
2449 | |
2450 | if (store && store->lookup_crls) | |
2451 | ctx->lookup_crls = store->lookup_crls; | |
2452 | else | |
6ddbb4cd | 2453 | ctx->lookup_crls = X509_STORE_CTX_get1_crls; |
0f113f3e | 2454 | |
ecdaa1ae | 2455 | ctx->param = X509_VERIFY_PARAM_new(); |
2456 | if (ctx->param == NULL) { | |
2457 | X509err(X509_F_X509_STORE_CTX_INIT, ERR_R_MALLOC_FAILURE); | |
2458 | goto err; | |
2459 | } | |
2460 | ||
2461 | /* | |
2462 | * Inherit callbacks and flags from X509_STORE if not set use defaults. | |
2463 | */ | |
2464 | if (store) | |
2465 | ret = X509_VERIFY_PARAM_inherit(ctx->param, store->param); | |
2466 | else | |
2467 | ctx->param->inh_flags |= X509_VP_FLAG_DEFAULT | X509_VP_FLAG_ONCE; | |
2468 | ||
2469 | if (ret) | |
2470 | ret = X509_VERIFY_PARAM_inherit(ctx->param, | |
2471 | X509_VERIFY_PARAM_lookup("default")); | |
2472 | ||
2473 | if (ret == 0) { | |
2474 | X509err(X509_F_X509_STORE_CTX_INIT, ERR_R_MALLOC_FAILURE); | |
2475 | goto err; | |
2476 | } | |
2477 | ||
0daccd4d VD |
2478 | /* |
2479 | * XXX: For now, continue to inherit trust from VPM, but infer from the | |
2480 | * purpose if this still yields the default value. | |
2481 | */ | |
2482 | if (ctx->param->trust == X509_TRUST_DEFAULT) { | |
2483 | int idx = X509_PURPOSE_get_by_id(ctx->param->purpose); | |
2484 | X509_PURPOSE *xp = X509_PURPOSE_get0(idx); | |
2485 | ||
2486 | if (xp != NULL) | |
2487 | ctx->param->trust = X509_PURPOSE_get_trust(xp); | |
2488 | } | |
2489 | ||
e29c73c9 VD |
2490 | if (CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx, |
2491 | &ctx->ex_data)) | |
2492 | return 1; | |
2493 | X509err(X509_F_X509_STORE_CTX_INIT, ERR_R_MALLOC_FAILURE); | |
ecdaa1ae | 2494 | |
d9b8b89b | 2495 | err: |
e29c73c9 VD |
2496 | /* |
2497 | * On error clean up allocated storage, if the store context was not | |
2498 | * allocated with X509_STORE_CTX_new() this is our last chance to do so. | |
2499 | */ | |
ecdaa1ae | 2500 | X509_STORE_CTX_cleanup(ctx); |
2501 | return 0; | |
0f113f3e MC |
2502 | } |
2503 | ||
2504 | /* | |
2505 | * Set alternative lookup method: just a STACK of trusted certificates. This | |
2506 | * avoids X509_STORE nastiness where it isn't needed. | |
2f043896 | 2507 | */ |
f0e0fd51 | 2508 | void X509_STORE_CTX_set0_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk) |
2f043896 | 2509 | { |
0f113f3e MC |
2510 | ctx->other_ctx = sk; |
2511 | ctx->get_issuer = get_issuer_sk; | |
c864e761 | 2512 | ctx->lookup_certs = lookup_certs_sk; |
2f043896 DSH |
2513 | } |
2514 | ||
2515 | void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx) | |
0f113f3e | 2516 | { |
e29c73c9 VD |
2517 | /* |
2518 | * We need to be idempotent because, unfortunately, free() also calls | |
2519 | * cleanup(), so the natural call sequence new(), init(), cleanup(), free() | |
2520 | * calls cleanup() for the same object twice! Thus we must zero the | |
2521 | * pointers below after they're freed! | |
2522 | */ | |
2523 | /* Seems to always be 0 in OpenSSL, do this at most once. */ | |
2524 | if (ctx->cleanup != NULL) { | |
0f113f3e | 2525 | ctx->cleanup(ctx); |
e29c73c9 VD |
2526 | ctx->cleanup = NULL; |
2527 | } | |
0f113f3e MC |
2528 | if (ctx->param != NULL) { |
2529 | if (ctx->parent == NULL) | |
2530 | X509_VERIFY_PARAM_free(ctx->param); | |
2531 | ctx->param = NULL; | |
2532 | } | |
222561fe RS |
2533 | X509_policy_tree_free(ctx->tree); |
2534 | ctx->tree = NULL; | |
2535 | sk_X509_pop_free(ctx->chain, X509_free); | |
2536 | ctx->chain = NULL; | |
0f113f3e | 2537 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx, &(ctx->ex_data)); |
16f8d4eb | 2538 | memset(&ctx->ex_data, 0, sizeof(ctx->ex_data)); |
0f113f3e | 2539 | } |
13938ace | 2540 | |
5d7c222d | 2541 | void X509_STORE_CTX_set_depth(X509_STORE_CTX *ctx, int depth) |
0f113f3e MC |
2542 | { |
2543 | X509_VERIFY_PARAM_set_depth(ctx->param, depth); | |
2544 | } | |
bbb72003 | 2545 | |
5d7c222d | 2546 | void X509_STORE_CTX_set_flags(X509_STORE_CTX *ctx, unsigned long flags) |
0f113f3e MC |
2547 | { |
2548 | X509_VERIFY_PARAM_set_flags(ctx->param, flags); | |
2549 | } | |
5d7c222d | 2550 | |
0f113f3e MC |
2551 | void X509_STORE_CTX_set_time(X509_STORE_CTX *ctx, unsigned long flags, |
2552 | time_t t) | |
2553 | { | |
2554 | X509_VERIFY_PARAM_set_time(ctx->param, t); | |
2555 | } | |
bbb72003 | 2556 | |
8cc86b81 | 2557 | X509 *X509_STORE_CTX_get0_cert(const X509_STORE_CTX *ctx) |
1060a50b RL |
2558 | { |
2559 | return ctx->cert; | |
2560 | } | |
2561 | ||
8cc86b81 | 2562 | STACK_OF(X509) *X509_STORE_CTX_get0_untrusted(const X509_STORE_CTX *ctx) |
1060a50b RL |
2563 | { |
2564 | return ctx->untrusted; | |
2565 | } | |
2566 | ||
2567 | void X509_STORE_CTX_set0_untrusted(X509_STORE_CTX *ctx, STACK_OF(X509) *sk) | |
2568 | { | |
2569 | ctx->untrusted = sk; | |
2570 | } | |
2571 | ||
2572 | void X509_STORE_CTX_set0_verified_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *sk) | |
2573 | { | |
2574 | sk_X509_pop_free(ctx->chain, X509_free); | |
2575 | ctx->chain = sk; | |
2576 | } | |
2577 | ||
db089ad6 | 2578 | void X509_STORE_CTX_set_verify_cb(X509_STORE_CTX *ctx, |
f0e0fd51 | 2579 | X509_STORE_CTX_verify_cb verify_cb) |
0f113f3e MC |
2580 | { |
2581 | ctx->verify_cb = verify_cb; | |
2582 | } | |
db089ad6 | 2583 | |
8cc86b81 | 2584 | X509_STORE_CTX_verify_cb X509_STORE_CTX_get_verify_cb(const X509_STORE_CTX *ctx) |
f0e0fd51 RS |
2585 | { |
2586 | return ctx->verify_cb; | |
2587 | } | |
2588 | ||
4a7b3a7b VD |
2589 | void X509_STORE_CTX_set_verify(X509_STORE_CTX *ctx, |
2590 | X509_STORE_CTX_verify_fn verify) | |
2591 | { | |
2592 | ctx->verify = verify; | |
2593 | } | |
2594 | ||
8cc86b81 | 2595 | X509_STORE_CTX_verify_fn X509_STORE_CTX_get_verify(const X509_STORE_CTX *ctx) |
f0e0fd51 | 2596 | { |
1060a50b | 2597 | return ctx->verify; |
f0e0fd51 RS |
2598 | } |
2599 | ||
8cc86b81 | 2600 | X509_STORE_CTX_get_issuer_fn X509_STORE_CTX_get_get_issuer(const X509_STORE_CTX *ctx) |
f0e0fd51 | 2601 | { |
1060a50b | 2602 | return ctx->get_issuer; |
f0e0fd51 RS |
2603 | } |
2604 | ||
8cc86b81 DDO |
2605 | X509_STORE_CTX_check_issued_fn |
2606 | X509_STORE_CTX_get_check_issued(const X509_STORE_CTX *ctx) | |
4dba585f | 2607 | { |
1060a50b | 2608 | return ctx->check_issued; |
4dba585f DSH |
2609 | } |
2610 | ||
8cc86b81 DDO |
2611 | X509_STORE_CTX_check_revocation_fn |
2612 | X509_STORE_CTX_get_check_revocation(const X509_STORE_CTX *ctx) | |
f0e0fd51 | 2613 | { |
1060a50b | 2614 | return ctx->check_revocation; |
f0e0fd51 RS |
2615 | } |
2616 | ||
8cc86b81 | 2617 | X509_STORE_CTX_get_crl_fn X509_STORE_CTX_get_get_crl(const X509_STORE_CTX *ctx) |
f0e0fd51 | 2618 | { |
1060a50b | 2619 | return ctx->get_crl; |
f0e0fd51 RS |
2620 | } |
2621 | ||
8cc86b81 | 2622 | X509_STORE_CTX_check_crl_fn X509_STORE_CTX_get_check_crl(const X509_STORE_CTX *ctx) |
f0e0fd51 | 2623 | { |
1060a50b RL |
2624 | return ctx->check_crl; |
2625 | } | |
2626 | ||
8cc86b81 | 2627 | X509_STORE_CTX_cert_crl_fn X509_STORE_CTX_get_cert_crl(const X509_STORE_CTX *ctx) |
1060a50b RL |
2628 | { |
2629 | return ctx->cert_crl; | |
2630 | } | |
2631 | ||
8cc86b81 DDO |
2632 | X509_STORE_CTX_check_policy_fn |
2633 | X509_STORE_CTX_get_check_policy(const X509_STORE_CTX *ctx) | |
1060a50b RL |
2634 | { |
2635 | return ctx->check_policy; | |
2636 | } | |
2637 | ||
8cc86b81 DDO |
2638 | X509_STORE_CTX_lookup_certs_fn |
2639 | X509_STORE_CTX_get_lookup_certs(const X509_STORE_CTX *ctx) | |
1060a50b RL |
2640 | { |
2641 | return ctx->lookup_certs; | |
2642 | } | |
2643 | ||
8cc86b81 DDO |
2644 | X509_STORE_CTX_lookup_crls_fn |
2645 | X509_STORE_CTX_get_lookup_crls(const X509_STORE_CTX *ctx) | |
1060a50b RL |
2646 | { |
2647 | return ctx->lookup_crls; | |
2648 | } | |
2649 | ||
8cc86b81 | 2650 | X509_STORE_CTX_cleanup_fn X509_STORE_CTX_get_cleanup(const X509_STORE_CTX *ctx) |
1060a50b RL |
2651 | { |
2652 | return ctx->cleanup; | |
f0e0fd51 RS |
2653 | } |
2654 | ||
8cc86b81 | 2655 | X509_POLICY_TREE *X509_STORE_CTX_get0_policy_tree(const X509_STORE_CTX *ctx) |
0f113f3e MC |
2656 | { |
2657 | return ctx->tree; | |
2658 | } | |
5d7c222d | 2659 | |
8cc86b81 | 2660 | int X509_STORE_CTX_get_explicit_policy(const X509_STORE_CTX *ctx) |
0f113f3e MC |
2661 | { |
2662 | return ctx->explicit_policy; | |
2663 | } | |
5d7c222d | 2664 | |
8cc86b81 | 2665 | int X509_STORE_CTX_get_num_untrusted(const X509_STORE_CTX *ctx) |
7f3f41d8 | 2666 | { |
d9b8b89b | 2667 | return ctx->num_untrusted; |
7f3f41d8 MC |
2668 | } |
2669 | ||
5d7c222d | 2670 | int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name) |
0f113f3e MC |
2671 | { |
2672 | const X509_VERIFY_PARAM *param; | |
12a765a5 | 2673 | |
0f113f3e | 2674 | param = X509_VERIFY_PARAM_lookup(name); |
12a765a5 | 2675 | if (param == NULL) |
0f113f3e MC |
2676 | return 0; |
2677 | return X509_VERIFY_PARAM_inherit(ctx->param, param); | |
2678 | } | |
5d7c222d | 2679 | |
8cc86b81 | 2680 | X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(const X509_STORE_CTX *ctx) |
0f113f3e MC |
2681 | { |
2682 | return ctx->param; | |
2683 | } | |
5d7c222d DSH |
2684 | |
2685 | void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param) | |
0f113f3e | 2686 | { |
222561fe | 2687 | X509_VERIFY_PARAM_free(ctx->param); |
0f113f3e MC |
2688 | ctx->param = param; |
2689 | } | |
d9b8b89b | 2690 | |
b9aec69a | 2691 | void X509_STORE_CTX_set0_dane(X509_STORE_CTX *ctx, SSL_DANE *dane) |
919ba009 VD |
2692 | { |
2693 | ctx->dane = dane; | |
2694 | } | |
2695 | ||
170b7358 VD |
2696 | static unsigned char *dane_i2d( |
2697 | X509 *cert, | |
2698 | uint8_t selector, | |
2699 | unsigned int *i2dlen) | |
2700 | { | |
2701 | unsigned char *buf = NULL; | |
2702 | int len; | |
2703 | ||
2704 | /* | |
2705 | * Extract ASN.1 DER form of certificate or public key. | |
2706 | */ | |
2707 | switch (selector) { | |
2708 | case DANETLS_SELECTOR_CERT: | |
2709 | len = i2d_X509(cert, &buf); | |
2710 | break; | |
2711 | case DANETLS_SELECTOR_SPKI: | |
2712 | len = i2d_X509_PUBKEY(X509_get_X509_PUBKEY(cert), &buf); | |
2713 | break; | |
2714 | default: | |
2715 | X509err(X509_F_DANE_I2D, X509_R_BAD_SELECTOR); | |
2716 | return NULL; | |
2717 | } | |
2718 | ||
2719 | if (len < 0 || buf == NULL) { | |
2720 | X509err(X509_F_DANE_I2D, ERR_R_MALLOC_FAILURE); | |
2721 | return NULL; | |
2722 | } | |
2723 | ||
2724 | *i2dlen = (unsigned int)len; | |
2725 | return buf; | |
2726 | } | |
2727 | ||
2728 | #define DANETLS_NONE 256 /* impossible uint8_t */ | |
2729 | ||
2730 | static int dane_match(X509_STORE_CTX *ctx, X509 *cert, int depth) | |
2731 | { | |
b9aec69a | 2732 | SSL_DANE *dane = ctx->dane; |
170b7358 VD |
2733 | unsigned usage = DANETLS_NONE; |
2734 | unsigned selector = DANETLS_NONE; | |
2735 | unsigned ordinal = DANETLS_NONE; | |
2736 | unsigned mtype = DANETLS_NONE; | |
2737 | unsigned char *i2dbuf = NULL; | |
2738 | unsigned int i2dlen = 0; | |
2739 | unsigned char mdbuf[EVP_MAX_MD_SIZE]; | |
2740 | unsigned char *cmpbuf = NULL; | |
2741 | unsigned int cmplen = 0; | |
2742 | int i; | |
2743 | int recnum; | |
2744 | int matched = 0; | |
2745 | danetls_record *t = NULL; | |
2746 | uint32_t mask; | |
2747 | ||
2748 | mask = (depth == 0) ? DANETLS_EE_MASK : DANETLS_TA_MASK; | |
2749 | ||
2750 | /* | |
2751 | * The trust store is not applicable with DANE-TA(2) | |
2752 | */ | |
2753 | if (depth >= ctx->num_untrusted) | |
2754 | mask &= DANETLS_PKIX_MASK; | |
2755 | ||
2756 | /* | |
2757 | * If we've previously matched a PKIX-?? record, no need to test any | |
02e112a8 | 2758 | * further PKIX-?? records, it remains to just build the PKIX chain. |
170b7358 VD |
2759 | * Had the match been a DANE-?? record, we'd be done already. |
2760 | */ | |
2761 | if (dane->mdpth >= 0) | |
2762 | mask &= ~DANETLS_PKIX_MASK; | |
2763 | ||
2764 | /*- | |
2765 | * https://tools.ietf.org/html/rfc7671#section-5.1 | |
2766 | * https://tools.ietf.org/html/rfc7671#section-5.2 | |
2767 | * https://tools.ietf.org/html/rfc7671#section-5.3 | |
2768 | * https://tools.ietf.org/html/rfc7671#section-5.4 | |
2769 | * | |
2770 | * We handle DANE-EE(3) records first as they require no chain building | |
2771 | * and no expiration or hostname checks. We also process digests with | |
2772 | * higher ordinals first and ignore lower priorities except Full(0) which | |
2773 | * is always processed (last). If none match, we then process PKIX-EE(1). | |
2774 | * | |
2775 | * NOTE: This relies on DANE usages sorting before the corresponding PKIX | |
2776 | * usages in SSL_dane_tlsa_add(), and also on descending sorting of digest | |
2777 | * priorities. See twin comment in ssl/ssl_lib.c. | |
2778 | * | |
2779 | * We expect that most TLSA RRsets will have just a single usage, so we | |
2780 | * don't go out of our way to cache multiple selector-specific i2d buffers | |
2781 | * across usages, but if the selector happens to remain the same as switch | |
2782 | * usages, that's OK. Thus, a set of "3 1 1", "3 0 1", "1 1 1", "1 0 1", | |
2783 | * records would result in us generating each of the certificate and public | |
2784 | * key DER forms twice, but more typically we'd just see multiple "3 1 1" | |
2785 | * or multiple "3 0 1" records. | |
2786 | * | |
2787 | * As soon as we find a match at any given depth, we stop, because either | |
2788 | * we've matched a DANE-?? record and the peer is authenticated, or, after | |
0d4fb843 | 2789 | * exhausting all DANE-?? records, we've matched a PKIX-?? record, which is |
170b7358 VD |
2790 | * sufficient for DANE, and what remains to do is ordinary PKIX validation. |
2791 | */ | |
2792 | recnum = (dane->umask & mask) ? sk_danetls_record_num(dane->trecs) : 0; | |
2793 | for (i = 0; matched == 0 && i < recnum; ++i) { | |
2794 | t = sk_danetls_record_value(dane->trecs, i); | |
2795 | if ((DANETLS_USAGE_BIT(t->usage) & mask) == 0) | |
2796 | continue; | |
2797 | if (t->usage != usage) { | |
2798 | usage = t->usage; | |
2799 | ||
2800 | /* Reset digest agility for each usage/selector pair */ | |
2801 | mtype = DANETLS_NONE; | |
2802 | ordinal = dane->dctx->mdord[t->mtype]; | |
2803 | } | |
2804 | if (t->selector != selector) { | |
2805 | selector = t->selector; | |
2806 | ||
2807 | /* Update per-selector state */ | |
2808 | OPENSSL_free(i2dbuf); | |
2809 | i2dbuf = dane_i2d(cert, selector, &i2dlen); | |
2810 | if (i2dbuf == NULL) | |
2811 | return -1; | |
2812 | ||
2813 | /* Reset digest agility for each usage/selector pair */ | |
2814 | mtype = DANETLS_NONE; | |
2815 | ordinal = dane->dctx->mdord[t->mtype]; | |
2816 | } else if (t->mtype != DANETLS_MATCHING_FULL) { | |
2817 | /*- | |
2818 | * Digest agility: | |
2819 | * | |
2820 | * <https://tools.ietf.org/html/rfc7671#section-9> | |
2821 | * | |
2822 | * For a fixed selector, after processing all records with the | |
2823 | * highest mtype ordinal, ignore all mtypes with lower ordinals | |
2824 | * other than "Full". | |
2825 | */ | |
2826 | if (dane->dctx->mdord[t->mtype] < ordinal) | |
2827 | continue; | |
2828 | } | |
2829 | ||
2830 | /* | |
2831 | * Each time we hit a (new selector or) mtype, re-compute the relevant | |
2832 | * digest, more complex caching is not worth the code space. | |
2833 | */ | |
2834 | if (t->mtype != mtype) { | |
2835 | const EVP_MD *md = dane->dctx->mdevp[mtype = t->mtype]; | |
2836 | cmpbuf = i2dbuf; | |
2837 | cmplen = i2dlen; | |
2838 | ||
2839 | if (md != NULL) { | |
dccd20d1 F |
2840 | cmpbuf = mdbuf; |
2841 | if (!EVP_Digest(i2dbuf, i2dlen, cmpbuf, &cmplen, md, 0)) { | |
2842 | matched = -1; | |
170b7358 VD |
2843 | break; |
2844 | } | |
2845 | } | |
2846 | } | |
2847 | ||
2848 | /* | |
2849 | * Squirrel away the certificate and depth if we have a match. Any | |
2850 | * DANE match is dispositive, but with PKIX we still need to build a | |
2851 | * full chain. | |
2852 | */ | |
2853 | if (cmplen == t->dlen && | |
2854 | memcmp(cmpbuf, t->data, cmplen) == 0) { | |
2855 | if (DANETLS_USAGE_BIT(usage) & DANETLS_DANE_MASK) | |
2856 | matched = 1; | |
2857 | if (matched || dane->mdpth < 0) { | |
2858 | dane->mdpth = depth; | |
2859 | dane->mtlsa = t; | |
2860 | OPENSSL_free(dane->mcert); | |
2861 | dane->mcert = cert; | |
2862 | X509_up_ref(cert); | |
2863 | } | |
2864 | break; | |
2865 | } | |
2866 | } | |
2867 | ||
2868 | /* Clear the one-element DER cache */ | |
2869 | OPENSSL_free(i2dbuf); | |
2870 | return matched; | |
2871 | } | |
2872 | ||
2873 | static int check_dane_issuer(X509_STORE_CTX *ctx, int depth) | |
2874 | { | |
b9aec69a | 2875 | SSL_DANE *dane = ctx->dane; |
170b7358 VD |
2876 | int matched = 0; |
2877 | X509 *cert; | |
2878 | ||
2879 | if (!DANETLS_HAS_TA(dane) || depth == 0) | |
2880 | return X509_TRUST_UNTRUSTED; | |
2881 | ||
2882 | /* | |
ade08735 | 2883 | * Record any DANE trust anchor matches, for the first depth to test, if |
170b7358 VD |
2884 | * there's one at that depth. (This'll be false for length 1 chains looking |
2885 | * for an exact match for the leaf certificate). | |
2886 | */ | |
2887 | cert = sk_X509_value(ctx->chain, depth); | |
2888 | if (cert != NULL && (matched = dane_match(ctx, cert, depth)) < 0) | |
2889 | return X509_TRUST_REJECTED; | |
2890 | if (matched > 0) { | |
2891 | ctx->num_untrusted = depth - 1; | |
2892 | return X509_TRUST_TRUSTED; | |
2893 | } | |
2894 | ||
2895 | return X509_TRUST_UNTRUSTED; | |
2896 | } | |
2897 | ||
2898 | static int check_dane_pkeys(X509_STORE_CTX *ctx) | |
2899 | { | |
b9aec69a | 2900 | SSL_DANE *dane = ctx->dane; |
170b7358 VD |
2901 | danetls_record *t; |
2902 | int num = ctx->num_untrusted; | |
2903 | X509 *cert = sk_X509_value(ctx->chain, num - 1); | |
2904 | int recnum = sk_danetls_record_num(dane->trecs); | |
2905 | int i; | |
2906 | ||
2907 | for (i = 0; i < recnum; ++i) { | |
2908 | t = sk_danetls_record_value(dane->trecs, i); | |
2909 | if (t->usage != DANETLS_USAGE_DANE_TA || | |
2910 | t->selector != DANETLS_SELECTOR_SPKI || | |
2911 | t->mtype != DANETLS_MATCHING_FULL || | |
6725682d | 2912 | X509_verify(cert, t->spki) <= 0) |
170b7358 VD |
2913 | continue; |
2914 | ||
c0a445a9 | 2915 | /* Clear any PKIX-?? matches that failed to extend to a full chain */ |
170b7358 VD |
2916 | X509_free(dane->mcert); |
2917 | dane->mcert = NULL; | |
2918 | ||
2919 | /* Record match via a bare TA public key */ | |
2920 | ctx->bare_ta_signed = 1; | |
2921 | dane->mdpth = num - 1; | |
2922 | dane->mtlsa = t; | |
2923 | ||
2924 | /* Prune any excess chain certificates */ | |
2925 | num = sk_X509_num(ctx->chain); | |
2926 | for (; num > ctx->num_untrusted; --num) | |
2927 | X509_free(sk_X509_pop(ctx->chain)); | |
2928 | ||
2929 | return X509_TRUST_TRUSTED; | |
2930 | } | |
2931 | ||
2932 | return X509_TRUST_UNTRUSTED; | |
2933 | } | |
2934 | ||
b9aec69a | 2935 | static void dane_reset(SSL_DANE *dane) |
170b7358 VD |
2936 | { |
2937 | /* | |
2938 | * Reset state to verify another chain, or clear after failure. | |
2939 | */ | |
2940 | X509_free(dane->mcert); | |
2941 | dane->mcert = NULL; | |
2942 | dane->mtlsa = NULL; | |
2943 | dane->mdpth = -1; | |
2944 | dane->pdpth = -1; | |
2945 | } | |
2946 | ||
6e328256 VD |
2947 | static int check_leaf_suiteb(X509_STORE_CTX *ctx, X509 *cert) |
2948 | { | |
2949 | int err = X509_chain_check_suiteb(NULL, cert, NULL, ctx->param->flags); | |
2950 | ||
2951 | if (err == X509_V_OK) | |
2952 | return 1; | |
70dd3c65 | 2953 | return verify_cb_cert(ctx, cert, 0, err); |
6e328256 VD |
2954 | } |
2955 | ||
170b7358 VD |
2956 | static int dane_verify(X509_STORE_CTX *ctx) |
2957 | { | |
2958 | X509 *cert = ctx->cert; | |
b9aec69a | 2959 | SSL_DANE *dane = ctx->dane; |
170b7358 VD |
2960 | int matched; |
2961 | int done; | |
2962 | ||
2963 | dane_reset(dane); | |
2964 | ||
89ff989d VD |
2965 | /*- |
2966 | * When testing the leaf certificate, if we match a DANE-EE(3) record, | |
2967 | * dane_match() returns 1 and we're done. If however we match a PKIX-EE(1) | |
2968 | * record, the match depth and matching TLSA record are recorded, but the | |
ade08735 | 2969 | * return value is 0, because we still need to find a PKIX trust anchor. |
89ff989d VD |
2970 | * Therefore, when DANE authentication is enabled (required), we're done |
2971 | * if: | |
2972 | * + matched < 0, internal error. | |
2973 | * + matched == 1, we matched a DANE-EE(3) record | |
2974 | * + matched == 0, mdepth < 0 (no PKIX-EE match) and there are no | |
2975 | * DANE-TA(2) or PKIX-TA(0) to test. | |
2976 | */ | |
170b7358 VD |
2977 | matched = dane_match(ctx, ctx->cert, 0); |
2978 | done = matched != 0 || (!DANETLS_HAS_TA(dane) && dane->mdpth < 0); | |
2979 | ||
2980 | if (done) | |
2981 | X509_get_pubkey_parameters(NULL, ctx->chain); | |
2982 | ||
2983 | if (matched > 0) { | |
70dd3c65 | 2984 | /* Callback invoked as needed */ |
6e328256 VD |
2985 | if (!check_leaf_suiteb(ctx, cert)) |
2986 | return 0; | |
5ae4ceb9 VD |
2987 | /* Callback invoked as needed */ |
2988 | if ((dane->flags & DANE_FLAG_NO_DANE_EE_NAMECHECKS) == 0 && | |
2989 | !check_id(ctx)) | |
2990 | return 0; | |
70dd3c65 | 2991 | /* Bypass internal_verify(), issue depth 0 success callback */ |
170b7358 VD |
2992 | ctx->error_depth = 0; |
2993 | ctx->current_cert = cert; | |
6e328256 | 2994 | return ctx->verify_cb(1, ctx); |
170b7358 VD |
2995 | } |
2996 | ||
2997 | if (matched < 0) { | |
2998 | ctx->error_depth = 0; | |
2999 | ctx->current_cert = cert; | |
3000 | ctx->error = X509_V_ERR_OUT_OF_MEM; | |
3001 | return -1; | |
3002 | } | |
3003 | ||
3004 | if (done) { | |
3005 | /* Fail early, TA-based success is not possible */ | |
6e328256 VD |
3006 | if (!check_leaf_suiteb(ctx, cert)) |
3007 | return 0; | |
70dd3c65 | 3008 | return verify_cb_cert(ctx, cert, 0, X509_V_ERR_DANE_NO_MATCH); |
170b7358 VD |
3009 | } |
3010 | ||
3011 | /* | |
3012 | * Chain verification for usages 0/1/2. TLSA record matching of depth > 0 | |
3013 | * certificates happens in-line with building the rest of the chain. | |
3014 | */ | |
3015 | return verify_chain(ctx); | |
3016 | } | |
3017 | ||
fbb82a60 VD |
3018 | /* Get issuer, without duplicate suppression */ |
3019 | static int get_issuer(X509 **issuer, X509_STORE_CTX *ctx, X509 *cert) | |
3020 | { | |
3021 | STACK_OF(X509) *saved_chain = ctx->chain; | |
3022 | int ok; | |
3023 | ||
3024 | ctx->chain = NULL; | |
3025 | ok = ctx->get_issuer(issuer, ctx, cert); | |
3026 | ctx->chain = saved_chain; | |
3027 | ||
3028 | return ok; | |
3029 | } | |
3030 | ||
d9b8b89b VD |
3031 | static int build_chain(X509_STORE_CTX *ctx) |
3032 | { | |
b9aec69a | 3033 | SSL_DANE *dane = ctx->dane; |
d9b8b89b VD |
3034 | int num = sk_X509_num(ctx->chain); |
3035 | X509 *cert = sk_X509_value(ctx->chain, num - 1); | |
0d8dbb52 | 3036 | int self_signed; |
d9b8b89b VD |
3037 | STACK_OF(X509) *sktmp = NULL; |
3038 | unsigned int search; | |
170b7358 | 3039 | int may_trusted = 0; |
d9b8b89b VD |
3040 | int may_alternate = 0; |
3041 | int trust = X509_TRUST_UNTRUSTED; | |
3042 | int alt_untrusted = 0; | |
3043 | int depth; | |
3044 | int ok = 0; | |
3045 | int i; | |
3046 | ||
3047 | /* Our chain starts with a single untrusted element. */ | |
24664a3b MC |
3048 | if (!ossl_assert(num == 1 && ctx->num_untrusted == num)) { |
3049 | X509err(X509_F_BUILD_CHAIN, ERR_R_INTERNAL_ERROR); | |
3050 | ctx->error = X509_V_ERR_UNSPECIFIED; | |
3051 | return 0; | |
3052 | } | |
d9b8b89b | 3053 | |
6725682d | 3054 | self_signed = X509_self_signed(cert, 0); |
02369787 | 3055 | if (self_signed < 0) { |
0c56a648 MC |
3056 | ctx->error = X509_V_ERR_UNSPECIFIED; |
3057 | return 0; | |
3058 | } | |
3059 | ||
d9b8b89b VD |
3060 | #define S_DOUNTRUSTED (1 << 0) /* Search untrusted chain */ |
3061 | #define S_DOTRUSTED (1 << 1) /* Search trusted store */ | |
3062 | #define S_DOALTERNATE (1 << 2) /* Retry with pruned alternate chain */ | |
3063 | /* | |
3064 | * Set up search policy, untrusted if possible, trusted-first if enabled. | |
170b7358 VD |
3065 | * If we're doing DANE and not doing PKIX-TA/PKIX-EE, we never look in the |
3066 | * trust_store, otherwise we might look there first. If not trusted-first, | |
3067 | * and alternate chains are not disabled, try building an alternate chain | |
3068 | * if no luck with untrusted first. | |
d9b8b89b VD |
3069 | */ |
3070 | search = (ctx->untrusted != NULL) ? S_DOUNTRUSTED : 0; | |
170b7358 VD |
3071 | if (DANETLS_HAS_PKIX(dane) || !DANETLS_HAS_DANE(dane)) { |
3072 | if (search == 0 || ctx->param->flags & X509_V_FLAG_TRUSTED_FIRST) | |
3073 | search |= S_DOTRUSTED; | |
3074 | else if (!(ctx->param->flags & X509_V_FLAG_NO_ALT_CHAINS)) | |
3075 | may_alternate = 1; | |
3076 | may_trusted = 1; | |
3077 | } | |
d9b8b89b VD |
3078 | |
3079 | /* | |
3080 | * Shallow-copy the stack of untrusted certificates (with TLS, this is | |
3081 | * typically the content of the peer's certificate message) so can make | |
3082 | * multiple passes over it, while free to remove elements as we go. | |
3083 | */ | |
3084 | if (ctx->untrusted && (sktmp = sk_X509_dup(ctx->untrusted)) == NULL) { | |
3085 | X509err(X509_F_BUILD_CHAIN, ERR_R_MALLOC_FAILURE); | |
f3e235ed | 3086 | ctx->error = X509_V_ERR_OUT_OF_MEM; |
d9b8b89b VD |
3087 | return 0; |
3088 | } | |
3089 | ||
69664d6a | 3090 | /* |
ade08735 | 3091 | * If we got any "DANE-TA(2) Cert(0) Full(0)" trust anchors from DNS, add |
69664d6a VD |
3092 | * them to our working copy of the untrusted certificate stack. Since the |
3093 | * caller of X509_STORE_CTX_init() may have provided only a leaf cert with | |
3094 | * no corresponding stack of untrusted certificates, we may need to create | |
3095 | * an empty stack first. [ At present only the ssl library provides DANE | |
3096 | * support, and ssl_verify_cert_chain() always provides a non-null stack | |
3097 | * containing at least the leaf certificate, but we must be prepared for | |
3098 | * this to change. ] | |
3099 | */ | |
170b7358 | 3100 | if (DANETLS_ENABLED(dane) && dane->certs != NULL) { |
69664d6a VD |
3101 | if (sktmp == NULL && (sktmp = sk_X509_new_null()) == NULL) { |
3102 | X509err(X509_F_BUILD_CHAIN, ERR_R_MALLOC_FAILURE); | |
f3e235ed | 3103 | ctx->error = X509_V_ERR_OUT_OF_MEM; |
69664d6a VD |
3104 | return 0; |
3105 | } | |
eeccc237 DDO |
3106 | if (!X509_add_certs(sktmp, dane->certs, X509_ADD_FLAG_DEFAULT)) { |
3107 | sk_X509_free(sktmp); | |
3108 | ctx->error = X509_V_ERR_OUT_OF_MEM; | |
3109 | return 0; | |
170b7358 VD |
3110 | } |
3111 | } | |
3112 | ||
d9b8b89b VD |
3113 | /* |
3114 | * Still absurdly large, but arithmetically safe, a lower hard upper bound | |
3115 | * might be reasonable. | |
3116 | */ | |
3117 | if (ctx->param->depth > INT_MAX/2) | |
3118 | ctx->param->depth = INT_MAX/2; | |
3119 | ||
3120 | /* | |
ade08735 | 3121 | * Try to extend the chain until we reach an ultimately trusted issuer. |
d9b8b89b VD |
3122 | * Build chains up to one longer the limit, later fail if we hit the limit, |
3123 | * with an X509_V_ERR_CERT_CHAIN_TOO_LONG error code. | |
3124 | */ | |
3125 | depth = ctx->param->depth + 1; | |
3126 | ||
3127 | while (search != 0) { | |
3128 | X509 *x; | |
3129 | X509 *xtmp = NULL; | |
3130 | ||
3131 | /* | |
3132 | * Look in the trust store if enabled for first lookup, or we've run | |
fbb82a60 VD |
3133 | * out of untrusted issuers and search here is not disabled. When we |
3134 | * reach the depth limit, we stop extending the chain, if by that point | |
ade08735 | 3135 | * we've not found a trust anchor, any trusted chain would be too long. |
fbb82a60 VD |
3136 | * |
3137 | * The error reported to the application verify callback is at the | |
3138 | * maximal valid depth with the current certificate equal to the last | |
3139 | * not ultimately-trusted issuer. For example, with verify_depth = 0, | |
3140 | * the callback will report errors at depth=1 when the immediate issuer | |
3141 | * of the leaf certificate is not a trust anchor. No attempt will be | |
3142 | * made to locate an issuer for that certificate, since such a chain | |
3143 | * would be a-priori too long. | |
d9b8b89b VD |
3144 | */ |
3145 | if ((search & S_DOTRUSTED) != 0) { | |
d9b8b89b VD |
3146 | i = num = sk_X509_num(ctx->chain); |
3147 | if ((search & S_DOALTERNATE) != 0) { | |
3148 | /* | |
3149 | * As high up the chain as we can, look for an alternative | |
3150 | * trusted issuer of an untrusted certificate that currently | |
3151 | * has an untrusted issuer. We use the alt_untrusted variable | |
3152 | * to track how far up the chain we find the first match. It | |
3153 | * is only if and when we find a match, that we prune the chain | |
3154 | * and reset ctx->num_untrusted to the reduced count of | |
3155 | * untrusted certificates. While we're searching for such a | |
3156 | * match (which may never be found), it is neither safe nor | |
3157 | * wise to preemptively modify either the chain or | |
3158 | * ctx->num_untrusted. | |
3159 | * | |
3160 | * Note, like ctx->num_untrusted, alt_untrusted is a count of | |
3161 | * untrusted certificates, not a "depth". | |
3162 | */ | |
3163 | i = alt_untrusted; | |
3164 | } | |
3165 | x = sk_X509_value(ctx->chain, i-1); | |
3166 | ||
fbb82a60 | 3167 | ok = (depth < num) ? 0 : get_issuer(&xtmp, ctx, x); |
d9b8b89b VD |
3168 | |
3169 | if (ok < 0) { | |
3170 | trust = X509_TRUST_REJECTED; | |
f3e235ed | 3171 | ctx->error = X509_V_ERR_STORE_LOOKUP; |
d9b8b89b VD |
3172 | search = 0; |
3173 | continue; | |
3174 | } | |
3175 | ||
3176 | if (ok > 0) { | |
3177 | /* | |
3178 | * Alternative trusted issuer for a mid-chain untrusted cert? | |
3179 | * Pop the untrusted cert's successors and retry. We might now | |
3180 | * be able to complete a valid chain via the trust store. Note | |
ade08735 DDO |
3181 | * that despite the current trust store match we might still |
3182 | * fail complete the chain to a suitable trust anchor, in which | |
d9b8b89b VD |
3183 | * case we may prune some more untrusted certificates and try |
3184 | * again. Thus the S_DOALTERNATE bit may yet be turned on | |
3185 | * again with an even shorter untrusted chain! | |
170b7358 VD |
3186 | * |
3187 | * If in the process we threw away our matching PKIX-TA trust | |
3188 | * anchor, reset DANE trust. We might find a suitable trusted | |
3189 | * certificate among the ones from the trust store. | |
d9b8b89b VD |
3190 | */ |
3191 | if ((search & S_DOALTERNATE) != 0) { | |
02369787 | 3192 | if (!ossl_assert(num > i && i > 0 && !self_signed)) { |
24664a3b MC |
3193 | X509err(X509_F_BUILD_CHAIN, ERR_R_INTERNAL_ERROR); |
3194 | X509_free(xtmp); | |
3195 | trust = X509_TRUST_REJECTED; | |
3196 | ctx->error = X509_V_ERR_UNSPECIFIED; | |
3197 | search = 0; | |
3198 | continue; | |
3199 | } | |
d9b8b89b VD |
3200 | search &= ~S_DOALTERNATE; |
3201 | for (; num > i; --num) | |
3202 | X509_free(sk_X509_pop(ctx->chain)); | |
3203 | ctx->num_untrusted = num; | |
170b7358 VD |
3204 | |
3205 | if (DANETLS_ENABLED(dane) && | |
3206 | dane->mdpth >= ctx->num_untrusted) { | |
3207 | dane->mdpth = -1; | |
3208 | X509_free(dane->mcert); | |
3209 | dane->mcert = NULL; | |
3210 | } | |
3211 | if (DANETLS_ENABLED(dane) && | |
3212 | dane->pdpth >= ctx->num_untrusted) | |
3213 | dane->pdpth = -1; | |
d9b8b89b VD |
3214 | } |
3215 | ||
3216 | /* | |
3217 | * Self-signed untrusted certificates get replaced by their | |
3218 | * trusted matching issuer. Otherwise, grow the chain. | |
3219 | */ | |
02369787 | 3220 | if (!self_signed) { |
d9b8b89b VD |
3221 | if (!sk_X509_push(ctx->chain, x = xtmp)) { |
3222 | X509_free(xtmp); | |
3223 | X509err(X509_F_BUILD_CHAIN, ERR_R_MALLOC_FAILURE); | |
3224 | trust = X509_TRUST_REJECTED; | |
f3e235ed | 3225 | ctx->error = X509_V_ERR_OUT_OF_MEM; |
d9b8b89b VD |
3226 | search = 0; |
3227 | continue; | |
3228 | } | |
6725682d | 3229 | self_signed = X509_self_signed(x, 0); |
02369787 | 3230 | if (self_signed < 0) { |
a268ed3a | 3231 | sk_X509_free(sktmp); |
0c56a648 MC |
3232 | ctx->error = X509_V_ERR_UNSPECIFIED; |
3233 | return 0; | |
3234 | } | |
d9b8b89b VD |
3235 | } else if (num == ctx->num_untrusted) { |
3236 | /* | |
3237 | * We have a self-signed certificate that has the same | |
3238 | * subject name (and perhaps keyid and/or serial number) as | |
ade08735 | 3239 | * a trust anchor. We must have an exact match to avoid |
d9b8b89b VD |
3240 | * possible impersonation via key substitution etc. |
3241 | */ | |
3242 | if (X509_cmp(x, xtmp) != 0) { | |
3243 | /* Self-signed untrusted mimic. */ | |
3244 | X509_free(xtmp); | |
3245 | ok = 0; | |
3246 | } else { | |
3247 | X509_free(x); | |
3248 | ctx->num_untrusted = --num; | |
3249 | (void) sk_X509_set(ctx->chain, num, x = xtmp); | |
3250 | } | |
3251 | } | |
3252 | ||
3253 | /* | |
3254 | * We've added a new trusted certificate to the chain, recheck | |
3255 | * trust. If not done, and not self-signed look deeper. | |
3256 | * Whether or not we're doing "trusted first", we no longer | |
3257 | * look for untrusted certificates from the peer's chain. | |
170b7358 VD |
3258 | * |
3259 | * At this point ctx->num_trusted and num must reflect the | |
3260 | * correct number of untrusted certificates, since the DANE | |
3261 | * logic in check_trust() depends on distinguishing CAs from | |
3262 | * "the wire" from CAs from the trust store. In particular, the | |
3263 | * certificate at depth "num" should be the new trusted | |
3264 | * certificate with ctx->num_untrusted <= num. | |
d9b8b89b VD |
3265 | */ |
3266 | if (ok) { | |
24664a3b MC |
3267 | if (!ossl_assert(ctx->num_untrusted <= num)) { |
3268 | X509err(X509_F_BUILD_CHAIN, ERR_R_INTERNAL_ERROR); | |
3269 | trust = X509_TRUST_REJECTED; | |
3270 | ctx->error = X509_V_ERR_UNSPECIFIED; | |
3271 | search = 0; | |
3272 | continue; | |
3273 | } | |
d9b8b89b VD |
3274 | search &= ~S_DOUNTRUSTED; |
3275 | switch (trust = check_trust(ctx, num)) { | |
3276 | case X509_TRUST_TRUSTED: | |
3277 | case X509_TRUST_REJECTED: | |
3278 | search = 0; | |
3279 | continue; | |
3280 | } | |
02369787 | 3281 | if (!self_signed) |
d9b8b89b VD |
3282 | continue; |
3283 | } | |
3284 | } | |
3285 | ||
3286 | /* | |
3287 | * No dispositive decision, and either self-signed or no match, if | |
3288 | * we were doing untrusted-first, and alt-chains are not disabled, | |
3289 | * do that, by repeatedly losing one untrusted element at a time, | |
3290 | * and trying to extend the shorted chain. | |
3291 | */ | |
3292 | if ((search & S_DOUNTRUSTED) == 0) { | |
3293 | /* Continue search for a trusted issuer of a shorter chain? */ | |
3294 | if ((search & S_DOALTERNATE) != 0 && --alt_untrusted > 0) | |
3295 | continue; | |
3296 | /* Still no luck and no fallbacks left? */ | |
3297 | if (!may_alternate || (search & S_DOALTERNATE) != 0 || | |
3298 | ctx->num_untrusted < 2) | |
3299 | break; | |
3300 | /* Search for a trusted issuer of a shorter chain */ | |
3301 | search |= S_DOALTERNATE; | |
3302 | alt_untrusted = ctx->num_untrusted - 1; | |
02369787 | 3303 | self_signed = 0; |
d9b8b89b VD |
3304 | } |
3305 | } | |
3306 | ||
3307 | /* | |
3308 | * Extend chain with peer-provided certificates | |
3309 | */ | |
3310 | if ((search & S_DOUNTRUSTED) != 0) { | |
3311 | num = sk_X509_num(ctx->chain); | |
24664a3b MC |
3312 | if (!ossl_assert(num == ctx->num_untrusted)) { |
3313 | X509err(X509_F_BUILD_CHAIN, ERR_R_INTERNAL_ERROR); | |
3314 | trust = X509_TRUST_REJECTED; | |
3315 | ctx->error = X509_V_ERR_UNSPECIFIED; | |
3316 | search = 0; | |
3317 | continue; | |
3318 | } | |
d9b8b89b | 3319 | x = sk_X509_value(ctx->chain, num-1); |
d9b8b89b VD |
3320 | |
3321 | /* | |
3322 | * Once we run out of untrusted issuers, we stop looking for more | |
3323 | * and start looking only in the trust store if enabled. | |
3324 | */ | |
02369787 DDO |
3325 | xtmp = (self_signed || depth < num) ? NULL |
3326 | : find_issuer(ctx, sktmp, x); | |
d9b8b89b VD |
3327 | if (xtmp == NULL) { |
3328 | search &= ~S_DOUNTRUSTED; | |
3329 | if (may_trusted) | |
3330 | search |= S_DOTRUSTED; | |
3331 | continue; | |
3332 | } | |
3333 | ||
fbb82a60 VD |
3334 | /* Drop this issuer from future consideration */ |
3335 | (void) sk_X509_delete_ptr(sktmp, xtmp); | |
3336 | ||
e9e7b5df BE |
3337 | if (!X509_up_ref(xtmp)) { |
3338 | X509err(X509_F_BUILD_CHAIN, ERR_R_INTERNAL_ERROR); | |
3339 | trust = X509_TRUST_REJECTED; | |
3340 | ctx->error = X509_V_ERR_UNSPECIFIED; | |
3341 | search = 0; | |
3342 | continue; | |
3343 | } | |
3344 | ||
fbb82a60 | 3345 | if (!sk_X509_push(ctx->chain, xtmp)) { |
e9e7b5df | 3346 | X509_free(xtmp); |
d9b8b89b VD |
3347 | X509err(X509_F_BUILD_CHAIN, ERR_R_MALLOC_FAILURE); |
3348 | trust = X509_TRUST_REJECTED; | |
f3e235ed | 3349 | ctx->error = X509_V_ERR_OUT_OF_MEM; |
d9b8b89b VD |
3350 | search = 0; |
3351 | continue; | |
3352 | } | |
fbb82a60 | 3353 | |
e9e7b5df | 3354 | x = xtmp; |
d9b8b89b | 3355 | ++ctx->num_untrusted; |
6725682d | 3356 | self_signed = X509_self_signed(xtmp, 0); |
02369787 | 3357 | if (self_signed < 0) { |
2a4ad6a5 | 3358 | sk_X509_free(sktmp); |
02369787 | 3359 | ctx->error = X509_V_ERR_UNSPECIFIED; |
0c56a648 MC |
3360 | return 0; |
3361 | } | |
d9b8b89b | 3362 | |
170b7358 VD |
3363 | /* |
3364 | * Check for DANE-TA trust of the topmost untrusted certificate. | |
3365 | */ | |
3366 | switch (trust = check_dane_issuer(ctx, ctx->num_untrusted - 1)) { | |
3367 | case X509_TRUST_TRUSTED: | |
3368 | case X509_TRUST_REJECTED: | |
3369 | search = 0; | |
3370 | continue; | |
3371 | } | |
d9b8b89b VD |
3372 | } |
3373 | } | |
3374 | sk_X509_free(sktmp); | |
3375 | ||
3376 | /* | |
170b7358 VD |
3377 | * Last chance to make a trusted chain, either bare DANE-TA public-key |
3378 | * signers, or else direct leaf PKIX trust. | |
d9b8b89b | 3379 | */ |
497ecc0d VD |
3380 | num = sk_X509_num(ctx->chain); |
3381 | if (num <= depth) { | |
170b7358 VD |
3382 | if (trust == X509_TRUST_UNTRUSTED && DANETLS_HAS_DANE_TA(dane)) |
3383 | trust = check_dane_pkeys(ctx); | |
497ecc0d VD |
3384 | if (trust == X509_TRUST_UNTRUSTED && num == ctx->num_untrusted) |
3385 | trust = check_trust(ctx, num); | |
d9b8b89b VD |
3386 | } |
3387 | ||
3388 | switch (trust) { | |
3389 | case X509_TRUST_TRUSTED: | |
3390 | return 1; | |
3391 | case X509_TRUST_REJECTED: | |
70dd3c65 | 3392 | /* Callback already issued */ |
d9b8b89b VD |
3393 | return 0; |
3394 | case X509_TRUST_UNTRUSTED: | |
3395 | default: | |
3396 | num = sk_X509_num(ctx->chain); | |
d9b8b89b | 3397 | if (num > depth) |
70dd3c65 VD |
3398 | return verify_cb_cert(ctx, NULL, num-1, |
3399 | X509_V_ERR_CERT_CHAIN_TOO_LONG); | |
3400 | if (DANETLS_ENABLED(dane) && | |
3401 | (!DANETLS_HAS_PKIX(dane) || dane->pdpth >= 0)) | |
3402 | return verify_cb_cert(ctx, NULL, num-1, X509_V_ERR_DANE_NO_MATCH); | |
02369787 | 3403 | if (self_signed && sk_X509_num(ctx->chain) == 1) |
70dd3c65 VD |
3404 | return verify_cb_cert(ctx, NULL, num-1, |
3405 | X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT); | |
02369787 | 3406 | if (self_signed) |
70dd3c65 VD |
3407 | return verify_cb_cert(ctx, NULL, num-1, |
3408 | X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN); | |
3409 | if (ctx->num_untrusted < num) | |
3410 | return verify_cb_cert(ctx, NULL, num-1, | |
3411 | X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT); | |
3412 | return verify_cb_cert(ctx, NULL, num-1, | |
3413 | X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY); | |
d9b8b89b VD |
3414 | } |
3415 | } | |
fbb82a60 VD |
3416 | |
3417 | static const int minbits_table[] = { 80, 112, 128, 192, 256 }; | |
3418 | static const int NUM_AUTH_LEVELS = OSSL_NELEM(minbits_table); | |
3419 | ||
3420 | /* | |
3421 | * Check whether the public key of ``cert`` meets the security level of | |
3422 | * ``ctx``. | |
3423 | * | |
3424 | * Returns 1 on success, 0 otherwise. | |
3425 | */ | |
3426 | static int check_key_level(X509_STORE_CTX *ctx, X509 *cert) | |
3427 | { | |
3428 | EVP_PKEY *pkey = X509_get0_pubkey(cert); | |
3429 | int level = ctx->param->auth_level; | |
3430 | ||
baba1545 KG |
3431 | /* |
3432 | * At security level zero, return without checking for a supported public | |
3433 | * key type. Some engines support key types not understood outside the | |
3434 | * engine, and we only need to understand the key when enforcing a security | |
3435 | * floor. | |
3436 | */ | |
3437 | if (level <= 0) | |
3438 | return 1; | |
3439 | ||
fbb82a60 VD |
3440 | /* Unsupported or malformed keys are not secure */ |
3441 | if (pkey == NULL) | |
3442 | return 0; | |
3443 | ||
fbb82a60 VD |
3444 | if (level > NUM_AUTH_LEVELS) |
3445 | level = NUM_AUTH_LEVELS; | |
3446 | ||
3447 | return EVP_PKEY_security_bits(pkey) >= minbits_table[level - 1]; | |
3448 | } | |
3449 | ||
cccf532f TM |
3450 | /* |
3451 | * Check whether the public key of ``cert`` does not use explicit params | |
3452 | * for an elliptic curve. | |
3453 | * | |
3454 | * Returns 1 on success, 0 if check fails, -1 for other errors. | |
3455 | */ | |
3456 | static int check_curve(X509 *cert) | |
3457 | { | |
3458 | #ifndef OPENSSL_NO_EC | |
3459 | EVP_PKEY *pkey = X509_get0_pubkey(cert); | |
3460 | ||
3461 | /* Unsupported or malformed key */ | |
3462 | if (pkey == NULL) | |
3463 | return -1; | |
3464 | ||
3465 | if (EVP_PKEY_id(pkey) == EVP_PKEY_EC) { | |
3466 | int ret; | |
3467 | ||
3468 | ret = EC_KEY_decoded_from_explicit_params(EVP_PKEY_get0_EC_KEY(pkey)); | |
3469 | return ret < 0 ? ret : !ret; | |
3470 | } | |
3471 | #endif | |
3472 | ||
3473 | return 1; | |
3474 | } | |
3475 | ||
fbb82a60 VD |
3476 | /* |
3477 | * Check whether the signature digest algorithm of ``cert`` meets the security | |
3478 | * level of ``ctx``. Should not be checked for trust anchors (whether | |
3479 | * self-signed or otherwise). | |
3480 | * | |
3481 | * Returns 1 on success, 0 otherwise. | |
3482 | */ | |
3483 | static int check_sig_level(X509_STORE_CTX *ctx, X509 *cert) | |
3484 | { | |
fbb82a60 VD |
3485 | int secbits = -1; |
3486 | int level = ctx->param->auth_level; | |
3487 | ||
3488 | if (level <= 0) | |
3489 | return 1; | |
3490 | if (level > NUM_AUTH_LEVELS) | |
3491 | level = NUM_AUTH_LEVELS; | |
3492 | ||
c3c8823c DSH |
3493 | if (!X509_get_signature_info(cert, NULL, NULL, &secbits, NULL)) |
3494 | return 0; | |
fbb82a60 VD |
3495 | |
3496 | return secbits >= minbits_table[level - 1]; | |
3497 | } |