Line data Source code
1 : /* v3_purp.c */
2 : /*
3 : * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4 : * 2001.
5 : */
6 : /* ====================================================================
7 : * Copyright (c) 1999-2004 The OpenSSL Project. All rights reserved.
8 : *
9 : * Redistribution and use in source and binary forms, with or without
10 : * modification, are permitted provided that the following conditions
11 : * are met:
12 : *
13 : * 1. Redistributions of source code must retain the above copyright
14 : * notice, this list of conditions and the following disclaimer.
15 : *
16 : * 2. Redistributions in binary form must reproduce the above copyright
17 : * notice, this list of conditions and the following disclaimer in
18 : * the documentation and/or other materials provided with the
19 : * distribution.
20 : *
21 : * 3. All advertising materials mentioning features or use of this
22 : * software must display the following acknowledgment:
23 : * "This product includes software developed by the OpenSSL Project
24 : * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 : *
26 : * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 : * endorse or promote products derived from this software without
28 : * prior written permission. For written permission, please contact
29 : * licensing@OpenSSL.org.
30 : *
31 : * 5. Products derived from this software may not be called "OpenSSL"
32 : * nor may "OpenSSL" appear in their names without prior written
33 : * permission of the OpenSSL Project.
34 : *
35 : * 6. Redistributions of any form whatsoever must retain the following
36 : * acknowledgment:
37 : * "This product includes software developed by the OpenSSL Project
38 : * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 : *
40 : * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 : * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 : * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 : * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 : * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 : * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 : * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 : * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 : * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 : * OF THE POSSIBILITY OF SUCH DAMAGE.
52 : * ====================================================================
53 : *
54 : * This product includes cryptographic software written by Eric Young
55 : * (eay@cryptsoft.com). This product includes software written by Tim
56 : * Hudson (tjh@cryptsoft.com).
57 : *
58 : */
59 :
60 : #include <stdio.h>
61 : #include "cryptlib.h"
62 : #include <openssl/x509v3.h>
63 : #include <openssl/x509_vfy.h>
64 :
65 : static void x509v3_cache_extensions(X509 *x);
66 :
67 : static int check_ssl_ca(const X509 *x);
68 : static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x,
69 : int ca);
70 : static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x,
71 : int ca);
72 : static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x,
73 : int ca);
74 : static int purpose_smime(const X509 *x, int ca);
75 : static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x,
76 : int ca);
77 : static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x,
78 : int ca);
79 : static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x,
80 : int ca);
81 : static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x,
82 : int ca);
83 : static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca);
84 : static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca);
85 :
86 : static int xp_cmp(const X509_PURPOSE *const *a, const X509_PURPOSE *const *b);
87 : static void xptable_free(X509_PURPOSE *p);
88 :
89 : static X509_PURPOSE xstandard[] = {
90 : {X509_PURPOSE_SSL_CLIENT, X509_TRUST_SSL_CLIENT, 0,
91 : check_purpose_ssl_client, "SSL client", "sslclient", NULL},
92 : {X509_PURPOSE_SSL_SERVER, X509_TRUST_SSL_SERVER, 0,
93 : check_purpose_ssl_server, "SSL server", "sslserver", NULL},
94 : {X509_PURPOSE_NS_SSL_SERVER, X509_TRUST_SSL_SERVER, 0,
95 : check_purpose_ns_ssl_server, "Netscape SSL server", "nssslserver", NULL},
96 : {X509_PURPOSE_SMIME_SIGN, X509_TRUST_EMAIL, 0, check_purpose_smime_sign,
97 : "S/MIME signing", "smimesign", NULL},
98 : {X509_PURPOSE_SMIME_ENCRYPT, X509_TRUST_EMAIL, 0,
99 : check_purpose_smime_encrypt, "S/MIME encryption", "smimeencrypt", NULL},
100 : {X509_PURPOSE_CRL_SIGN, X509_TRUST_COMPAT, 0, check_purpose_crl_sign,
101 : "CRL signing", "crlsign", NULL},
102 : {X509_PURPOSE_ANY, X509_TRUST_DEFAULT, 0, no_check, "Any Purpose", "any",
103 : NULL},
104 : {X509_PURPOSE_OCSP_HELPER, X509_TRUST_COMPAT, 0, ocsp_helper,
105 : "OCSP helper", "ocsphelper", NULL},
106 : {X509_PURPOSE_TIMESTAMP_SIGN, X509_TRUST_TSA, 0,
107 : check_purpose_timestamp_sign, "Time Stamp signing", "timestampsign",
108 : NULL},
109 : };
110 :
111 : #define X509_PURPOSE_COUNT (sizeof(xstandard)/sizeof(X509_PURPOSE))
112 :
113 : IMPLEMENT_STACK_OF(X509_PURPOSE)
114 :
115 : static STACK_OF(X509_PURPOSE) *xptable = NULL;
116 :
117 0 : static int xp_cmp(const X509_PURPOSE *const *a, const X509_PURPOSE *const *b)
118 : {
119 0 : return (*a)->purpose - (*b)->purpose;
120 : }
121 :
122 : /*
123 : * As much as I'd like to make X509_check_purpose use a "const" X509* I
124 : * really can't because it does recalculate hashes and do other non-const
125 : * things.
126 : */
127 3339 : int X509_check_purpose(X509 *x, int id, int ca)
128 : {
129 : int idx;
130 : const X509_PURPOSE *pt;
131 3339 : if (!(x->ex_flags & EXFLAG_SET)) {
132 707 : CRYPTO_w_lock(CRYPTO_LOCK_X509);
133 707 : x509v3_cache_extensions(x);
134 707 : CRYPTO_w_unlock(CRYPTO_LOCK_X509);
135 : }
136 3339 : if (id == -1)
137 : return 1;
138 370 : idx = X509_PURPOSE_get_by_id(id);
139 370 : if (idx == -1)
140 : return -1;
141 370 : pt = X509_PURPOSE_get0(idx);
142 370 : return pt->check_purpose(pt, x, ca);
143 : }
144 :
145 0 : int X509_PURPOSE_set(int *p, int purpose)
146 : {
147 0 : if (X509_PURPOSE_get_by_id(purpose) == -1) {
148 0 : X509V3err(X509V3_F_X509_PURPOSE_SET, X509V3_R_INVALID_PURPOSE);
149 0 : return 0;
150 : }
151 0 : *p = purpose;
152 0 : return 1;
153 : }
154 :
155 0 : int X509_PURPOSE_get_count(void)
156 : {
157 0 : if (!xptable)
158 : return X509_PURPOSE_COUNT;
159 0 : return sk_X509_PURPOSE_num(xptable) + X509_PURPOSE_COUNT;
160 : }
161 :
162 370 : X509_PURPOSE *X509_PURPOSE_get0(int idx)
163 : {
164 370 : if (idx < 0)
165 : return NULL;
166 370 : if (idx < (int)X509_PURPOSE_COUNT)
167 370 : return xstandard + idx;
168 0 : return sk_X509_PURPOSE_value(xptable, idx - X509_PURPOSE_COUNT);
169 : }
170 :
171 0 : int X509_PURPOSE_get_by_sname(char *sname)
172 : {
173 : int i;
174 : X509_PURPOSE *xptmp;
175 0 : for (i = 0; i < X509_PURPOSE_get_count(); i++) {
176 0 : xptmp = X509_PURPOSE_get0(i);
177 0 : if (!strcmp(xptmp->sname, sname))
178 : return i;
179 : }
180 : return -1;
181 : }
182 :
183 370 : int X509_PURPOSE_get_by_id(int purpose)
184 : {
185 : X509_PURPOSE tmp;
186 : int idx;
187 370 : if ((purpose >= X509_PURPOSE_MIN) && (purpose <= X509_PURPOSE_MAX))
188 370 : return purpose - X509_PURPOSE_MIN;
189 0 : tmp.purpose = purpose;
190 0 : if (!xptable)
191 : return -1;
192 0 : idx = sk_X509_PURPOSE_find(xptable, &tmp);
193 0 : if (idx == -1)
194 : return -1;
195 0 : return idx + X509_PURPOSE_COUNT;
196 : }
197 :
198 0 : int X509_PURPOSE_add(int id, int trust, int flags,
199 : int (*ck) (const X509_PURPOSE *, const X509 *, int),
200 : char *name, char *sname, void *arg)
201 : {
202 : int idx;
203 : X509_PURPOSE *ptmp;
204 : /*
205 : * This is set according to what we change: application can't set it
206 : */
207 0 : flags &= ~X509_PURPOSE_DYNAMIC;
208 : /* This will always be set for application modified trust entries */
209 0 : flags |= X509_PURPOSE_DYNAMIC_NAME;
210 : /* Get existing entry if any */
211 0 : idx = X509_PURPOSE_get_by_id(id);
212 : /* Need a new entry */
213 0 : if (idx == -1) {
214 0 : if (!(ptmp = OPENSSL_malloc(sizeof(X509_PURPOSE)))) {
215 0 : X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE);
216 0 : return 0;
217 : }
218 0 : ptmp->flags = X509_PURPOSE_DYNAMIC;
219 : } else
220 0 : ptmp = X509_PURPOSE_get0(idx);
221 :
222 : /* OPENSSL_free existing name if dynamic */
223 0 : if (ptmp->flags & X509_PURPOSE_DYNAMIC_NAME) {
224 0 : OPENSSL_free(ptmp->name);
225 0 : OPENSSL_free(ptmp->sname);
226 : }
227 : /* dup supplied name */
228 0 : ptmp->name = BUF_strdup(name);
229 0 : ptmp->sname = BUF_strdup(sname);
230 0 : if (!ptmp->name || !ptmp->sname) {
231 0 : X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE);
232 0 : return 0;
233 : }
234 : /* Keep the dynamic flag of existing entry */
235 0 : ptmp->flags &= X509_PURPOSE_DYNAMIC;
236 : /* Set all other flags */
237 0 : ptmp->flags |= flags;
238 :
239 0 : ptmp->purpose = id;
240 0 : ptmp->trust = trust;
241 0 : ptmp->check_purpose = ck;
242 0 : ptmp->usr_data = arg;
243 :
244 : /* If its a new entry manage the dynamic table */
245 0 : if (idx == -1) {
246 0 : if (!xptable && !(xptable = sk_X509_PURPOSE_new(xp_cmp))) {
247 0 : X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE);
248 0 : return 0;
249 : }
250 0 : if (!sk_X509_PURPOSE_push(xptable, ptmp)) {
251 0 : X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE);
252 0 : return 0;
253 : }
254 : }
255 : return 1;
256 : }
257 :
258 0 : static void xptable_free(X509_PURPOSE *p)
259 : {
260 0 : if (!p)
261 0 : return;
262 0 : if (p->flags & X509_PURPOSE_DYNAMIC) {
263 0 : if (p->flags & X509_PURPOSE_DYNAMIC_NAME) {
264 0 : OPENSSL_free(p->name);
265 0 : OPENSSL_free(p->sname);
266 : }
267 0 : OPENSSL_free(p);
268 : }
269 : }
270 :
271 0 : void X509_PURPOSE_cleanup(void)
272 : {
273 : unsigned int i;
274 0 : sk_X509_PURPOSE_pop_free(xptable, xptable_free);
275 0 : for (i = 0; i < X509_PURPOSE_COUNT; i++)
276 0 : xptable_free(xstandard + i);
277 0 : xptable = NULL;
278 0 : }
279 :
280 0 : int X509_PURPOSE_get_id(X509_PURPOSE *xp)
281 : {
282 0 : return xp->purpose;
283 : }
284 :
285 0 : char *X509_PURPOSE_get0_name(X509_PURPOSE *xp)
286 : {
287 0 : return xp->name;
288 : }
289 :
290 0 : char *X509_PURPOSE_get0_sname(X509_PURPOSE *xp)
291 : {
292 0 : return xp->sname;
293 : }
294 :
295 0 : int X509_PURPOSE_get_trust(X509_PURPOSE *xp)
296 : {
297 0 : return xp->trust;
298 : }
299 :
300 : static int nid_cmp(const int *a, const int *b)
301 : {
302 0 : return *a - *b;
303 : }
304 :
305 : DECLARE_OBJ_BSEARCH_CMP_FN(int, int, nid);
306 0 : IMPLEMENT_OBJ_BSEARCH_CMP_FN(int, int, nid);
307 :
308 0 : int X509_supported_extension(X509_EXTENSION *ex)
309 : {
310 : /*
311 : * This table is a list of the NIDs of supported extensions: that is
312 : * those which are used by the verify process. If an extension is
313 : * critical and doesn't appear in this list then the verify process will
314 : * normally reject the certificate. The list must be kept in numerical
315 : * order because it will be searched using bsearch.
316 : */
317 :
318 : static const int supported_nids[] = {
319 : NID_netscape_cert_type, /* 71 */
320 : NID_key_usage, /* 83 */
321 : NID_subject_alt_name, /* 85 */
322 : NID_basic_constraints, /* 87 */
323 : NID_certificate_policies, /* 89 */
324 : NID_ext_key_usage, /* 126 */
325 : #ifndef OPENSSL_NO_RFC3779
326 : NID_sbgp_ipAddrBlock, /* 290 */
327 : NID_sbgp_autonomousSysNum, /* 291 */
328 : #endif
329 : NID_policy_constraints, /* 401 */
330 : NID_proxyCertInfo, /* 663 */
331 : NID_name_constraints, /* 666 */
332 : NID_policy_mappings, /* 747 */
333 : NID_inhibit_any_policy /* 748 */
334 : };
335 :
336 0 : int ex_nid = OBJ_obj2nid(X509_EXTENSION_get_object(ex));
337 :
338 0 : if (ex_nid == NID_undef)
339 : return 0;
340 :
341 0 : if (OBJ_bsearch_nid(&ex_nid, supported_nids,
342 : sizeof(supported_nids) / sizeof(int)))
343 : return 1;
344 0 : return 0;
345 : }
346 :
347 0 : static void setup_dp(X509 *x, DIST_POINT *dp)
348 : {
349 : X509_NAME *iname = NULL;
350 : int i;
351 0 : if (dp->reasons) {
352 0 : if (dp->reasons->length > 0)
353 0 : dp->dp_reasons = dp->reasons->data[0];
354 0 : if (dp->reasons->length > 1)
355 0 : dp->dp_reasons |= (dp->reasons->data[1] << 8);
356 0 : dp->dp_reasons &= CRLDP_ALL_REASONS;
357 : } else
358 0 : dp->dp_reasons = CRLDP_ALL_REASONS;
359 0 : if (!dp->distpoint || (dp->distpoint->type != 1))
360 0 : return;
361 0 : for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++) {
362 0 : GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i);
363 0 : if (gen->type == GEN_DIRNAME) {
364 0 : iname = gen->d.directoryName;
365 0 : break;
366 : }
367 : }
368 0 : if (!iname)
369 0 : iname = X509_get_issuer_name(x);
370 :
371 0 : DIST_POINT_set_dpname(dp->distpoint, iname);
372 :
373 : }
374 :
375 1037 : static void setup_crldp(X509 *x)
376 : {
377 : int i;
378 1037 : x->crldp = X509_get_ext_d2i(x, NID_crl_distribution_points, NULL, NULL);
379 1037 : for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++)
380 0 : setup_dp(x, sk_DIST_POINT_value(x->crldp, i));
381 1037 : }
382 :
383 2187 : static void x509v3_cache_extensions(X509 *x)
384 : {
385 : BASIC_CONSTRAINTS *bs;
386 : PROXY_CERT_INFO_EXTENSION *pci;
387 : ASN1_BIT_STRING *usage;
388 : ASN1_BIT_STRING *ns;
389 : EXTENDED_KEY_USAGE *extusage;
390 : X509_EXTENSION *ex;
391 :
392 : int i;
393 2187 : if (x->ex_flags & EXFLAG_SET)
394 1150 : return;
395 : #ifndef OPENSSL_NO_SHA
396 1037 : X509_digest(x, EVP_sha1(), x->sha1_hash, NULL);
397 : #endif
398 : /* V1 should mean no extensions ... */
399 1037 : if (!X509_get_version(x))
400 330 : x->ex_flags |= EXFLAG_V1;
401 : /* Handle basic constraints */
402 1037 : if ((bs = X509_get_ext_d2i(x, NID_basic_constraints, NULL, NULL))) {
403 707 : if (bs->ca)
404 0 : x->ex_flags |= EXFLAG_CA;
405 707 : if (bs->pathlen) {
406 0 : if ((bs->pathlen->type == V_ASN1_NEG_INTEGER)
407 0 : || !bs->ca) {
408 0 : x->ex_flags |= EXFLAG_INVALID;
409 0 : x->ex_pathlen = 0;
410 : } else
411 0 : x->ex_pathlen = ASN1_INTEGER_get(bs->pathlen);
412 : } else
413 707 : x->ex_pathlen = -1;
414 707 : BASIC_CONSTRAINTS_free(bs);
415 707 : x->ex_flags |= EXFLAG_BCONS;
416 : }
417 : /* Handle proxy certificates */
418 1037 : if ((pci = X509_get_ext_d2i(x, NID_proxyCertInfo, NULL, NULL))) {
419 0 : if (x->ex_flags & EXFLAG_CA
420 0 : || X509_get_ext_by_NID(x, NID_subject_alt_name, -1) >= 0
421 0 : || X509_get_ext_by_NID(x, NID_issuer_alt_name, -1) >= 0) {
422 0 : x->ex_flags |= EXFLAG_INVALID;
423 : }
424 0 : if (pci->pcPathLengthConstraint) {
425 0 : x->ex_pcpathlen = ASN1_INTEGER_get(pci->pcPathLengthConstraint);
426 : } else
427 0 : x->ex_pcpathlen = -1;
428 0 : PROXY_CERT_INFO_EXTENSION_free(pci);
429 0 : x->ex_flags |= EXFLAG_PROXY;
430 : }
431 : /* Handle key usage */
432 1037 : if ((usage = X509_get_ext_d2i(x, NID_key_usage, NULL, NULL))) {
433 707 : if (usage->length > 0) {
434 707 : x->ex_kusage = usage->data[0];
435 707 : if (usage->length > 1)
436 0 : x->ex_kusage |= usage->data[1] << 8;
437 : } else
438 0 : x->ex_kusage = 0;
439 707 : x->ex_flags |= EXFLAG_KUSAGE;
440 707 : ASN1_BIT_STRING_free(usage);
441 : }
442 1037 : x->ex_xkusage = 0;
443 1037 : if ((extusage = X509_get_ext_d2i(x, NID_ext_key_usage, NULL, NULL))) {
444 0 : x->ex_flags |= EXFLAG_XKUSAGE;
445 0 : for (i = 0; i < sk_ASN1_OBJECT_num(extusage); i++) {
446 0 : switch (OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage, i))) {
447 : case NID_server_auth:
448 0 : x->ex_xkusage |= XKU_SSL_SERVER;
449 0 : break;
450 :
451 : case NID_client_auth:
452 0 : x->ex_xkusage |= XKU_SSL_CLIENT;
453 0 : break;
454 :
455 : case NID_email_protect:
456 0 : x->ex_xkusage |= XKU_SMIME;
457 0 : break;
458 :
459 : case NID_code_sign:
460 0 : x->ex_xkusage |= XKU_CODE_SIGN;
461 0 : break;
462 :
463 : case NID_ms_sgc:
464 : case NID_ns_sgc:
465 0 : x->ex_xkusage |= XKU_SGC;
466 0 : break;
467 :
468 : case NID_OCSP_sign:
469 0 : x->ex_xkusage |= XKU_OCSP_SIGN;
470 0 : break;
471 :
472 : case NID_time_stamp:
473 0 : x->ex_xkusage |= XKU_TIMESTAMP;
474 0 : break;
475 :
476 : case NID_dvcs:
477 0 : x->ex_xkusage |= XKU_DVCS;
478 0 : break;
479 :
480 : case NID_anyExtendedKeyUsage:
481 0 : x->ex_xkusage |= XKU_ANYEKU;
482 0 : break;
483 : }
484 : }
485 0 : sk_ASN1_OBJECT_pop_free(extusage, ASN1_OBJECT_free);
486 : }
487 :
488 1037 : if ((ns = X509_get_ext_d2i(x, NID_netscape_cert_type, NULL, NULL))) {
489 0 : if (ns->length > 0)
490 0 : x->ex_nscert = ns->data[0];
491 : else
492 0 : x->ex_nscert = 0;
493 0 : x->ex_flags |= EXFLAG_NSCERT;
494 0 : ASN1_BIT_STRING_free(ns);
495 : }
496 1037 : x->skid = X509_get_ext_d2i(x, NID_subject_key_identifier, NULL, NULL);
497 1037 : x->akid = X509_get_ext_d2i(x, NID_authority_key_identifier, NULL, NULL);
498 : /* Does subject name match issuer ? */
499 1037 : if (!X509_NAME_cmp(X509_get_subject_name(x), X509_get_issuer_name(x))) {
500 330 : x->ex_flags |= EXFLAG_SI;
501 : /* If SKID matches AKID also indicate self signed */
502 330 : if (X509_check_akid(x, x->akid) == X509_V_OK)
503 330 : x->ex_flags |= EXFLAG_SS;
504 : }
505 1037 : x->altname = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
506 1037 : x->nc = X509_get_ext_d2i(x, NID_name_constraints, &i, NULL);
507 1037 : if (!x->nc && (i != -1))
508 0 : x->ex_flags |= EXFLAG_INVALID;
509 1037 : setup_crldp(x);
510 :
511 : #ifndef OPENSSL_NO_RFC3779
512 : x->rfc3779_addr = X509_get_ext_d2i(x, NID_sbgp_ipAddrBlock, NULL, NULL);
513 : x->rfc3779_asid = X509_get_ext_d2i(x, NID_sbgp_autonomousSysNum,
514 : NULL, NULL);
515 : #endif
516 3158 : for (i = 0; i < X509_get_ext_count(x); i++) {
517 2121 : ex = X509_get_ext(x, i);
518 2121 : if (OBJ_obj2nid(X509_EXTENSION_get_object(ex))
519 : == NID_freshest_crl)
520 0 : x->ex_flags |= EXFLAG_FRESHEST;
521 2121 : if (!X509_EXTENSION_get_critical(ex))
522 2121 : continue;
523 0 : if (!X509_supported_extension(ex)) {
524 0 : x->ex_flags |= EXFLAG_CRITICAL;
525 0 : break;
526 : }
527 : }
528 1037 : x->ex_flags |= EXFLAG_SET;
529 : }
530 :
531 : /*-
532 : * CA checks common to all purposes
533 : * return codes:
534 : * 0 not a CA
535 : * 1 is a CA
536 : * 2 basicConstraints absent so "maybe" a CA
537 : * 3 basicConstraints absent but self signed V1.
538 : * 4 basicConstraints absent but keyUsage present and keyCertSign asserted.
539 : */
540 :
541 : #define V1_ROOT (EXFLAG_V1|EXFLAG_SS)
542 : #define ku_reject(x, usage) \
543 : (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage)))
544 : #define xku_reject(x, usage) \
545 : (((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage)))
546 : #define ns_reject(x, usage) \
547 : (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage)))
548 :
549 370 : static int check_ca(const X509 *x)
550 : {
551 : /* keyUsage if present should allow cert signing */
552 370 : if (ku_reject(x, KU_KEY_CERT_SIGN))
553 : return 0;
554 0 : if (x->ex_flags & EXFLAG_BCONS) {
555 0 : if (x->ex_flags & EXFLAG_CA)
556 : return 1;
557 : /* If basicConstraints says not a CA then say so */
558 : else
559 0 : return 0;
560 : } else {
561 : /* we support V1 roots for... uh, I don't really know why. */
562 0 : if ((x->ex_flags & V1_ROOT) == V1_ROOT)
563 : return 3;
564 : /*
565 : * If key usage present it must have certSign so tolerate it
566 : */
567 0 : else if (x->ex_flags & EXFLAG_KUSAGE)
568 : return 4;
569 : /* Older certificates could have Netscape-specific CA types */
570 0 : else if (x->ex_flags & EXFLAG_NSCERT && x->ex_nscert & NS_ANY_CA)
571 : return 5;
572 : /* can this still be regarded a CA certificate? I doubt it */
573 0 : return 0;
574 : }
575 : }
576 :
577 370 : int X509_check_ca(X509 *x)
578 : {
579 370 : if (!(x->ex_flags & EXFLAG_SET)) {
580 0 : CRYPTO_w_lock(CRYPTO_LOCK_X509);
581 0 : x509v3_cache_extensions(x);
582 0 : CRYPTO_w_unlock(CRYPTO_LOCK_X509);
583 : }
584 :
585 370 : return check_ca(x);
586 : }
587 :
588 : /* Check SSL CA: common checks for SSL client and server */
589 0 : static int check_ssl_ca(const X509 *x)
590 : {
591 : int ca_ret;
592 0 : ca_ret = check_ca(x);
593 0 : if (!ca_ret)
594 : return 0;
595 : /* check nsCertType if present */
596 0 : if (ca_ret != 5 || x->ex_nscert & NS_SSL_CA)
597 0 : return ca_ret;
598 : else
599 : return 0;
600 : }
601 :
602 0 : static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x,
603 : int ca)
604 : {
605 0 : if (xku_reject(x, XKU_SSL_CLIENT))
606 : return 0;
607 0 : if (ca)
608 0 : return check_ssl_ca(x);
609 : /* We need to do digital signatures or key agreement */
610 0 : if (ku_reject(x, KU_DIGITAL_SIGNATURE | KU_KEY_AGREEMENT))
611 : return 0;
612 : /* nsCertType if present should allow SSL client use */
613 0 : if (ns_reject(x, NS_SSL_CLIENT))
614 : return 0;
615 0 : return 1;
616 : }
617 :
618 : /*
619 : * Key usage needed for TLS/SSL server: digital signature, encipherment or
620 : * key agreement. The ssl code can check this more thoroughly for individual
621 : * key types.
622 : */
623 : #define KU_TLS \
624 : KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT|KU_KEY_AGREEMENT
625 :
626 370 : static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x,
627 : int ca)
628 : {
629 370 : if (xku_reject(x, XKU_SSL_SERVER | XKU_SGC))
630 : return 0;
631 370 : if (ca)
632 0 : return check_ssl_ca(x);
633 :
634 370 : if (ns_reject(x, NS_SSL_SERVER))
635 : return 0;
636 370 : if (ku_reject(x, KU_TLS))
637 : return 0;
638 :
639 370 : return 1;
640 :
641 : }
642 :
643 0 : static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x,
644 : int ca)
645 : {
646 : int ret;
647 0 : ret = check_purpose_ssl_server(xp, x, ca);
648 0 : if (!ret || ca)
649 : return ret;
650 : /* We need to encipher or Netscape complains */
651 0 : if (ku_reject(x, KU_KEY_ENCIPHERMENT))
652 : return 0;
653 0 : return ret;
654 : }
655 :
656 : /* common S/MIME checks */
657 0 : static int purpose_smime(const X509 *x, int ca)
658 : {
659 0 : if (xku_reject(x, XKU_SMIME))
660 : return 0;
661 0 : if (ca) {
662 : int ca_ret;
663 0 : ca_ret = check_ca(x);
664 0 : if (!ca_ret)
665 : return 0;
666 : /* check nsCertType if present */
667 0 : if (ca_ret != 5 || x->ex_nscert & NS_SMIME_CA)
668 0 : return ca_ret;
669 : else
670 : return 0;
671 : }
672 0 : if (x->ex_flags & EXFLAG_NSCERT) {
673 0 : if (x->ex_nscert & NS_SMIME)
674 : return 1;
675 : /* Workaround for some buggy certificates */
676 0 : if (x->ex_nscert & NS_SSL_CLIENT)
677 : return 2;
678 0 : return 0;
679 : }
680 : return 1;
681 : }
682 :
683 0 : static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x,
684 : int ca)
685 : {
686 : int ret;
687 0 : ret = purpose_smime(x, ca);
688 0 : if (!ret || ca)
689 : return ret;
690 0 : if (ku_reject(x, KU_DIGITAL_SIGNATURE | KU_NON_REPUDIATION))
691 : return 0;
692 0 : return ret;
693 : }
694 :
695 0 : static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x,
696 : int ca)
697 : {
698 : int ret;
699 0 : ret = purpose_smime(x, ca);
700 0 : if (!ret || ca)
701 : return ret;
702 0 : if (ku_reject(x, KU_KEY_ENCIPHERMENT))
703 : return 0;
704 0 : return ret;
705 : }
706 :
707 0 : static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x,
708 : int ca)
709 : {
710 0 : if (ca) {
711 : int ca_ret;
712 0 : if ((ca_ret = check_ca(x)) != 2)
713 0 : return ca_ret;
714 : else
715 : return 0;
716 : }
717 0 : if (ku_reject(x, KU_CRL_SIGN))
718 : return 0;
719 0 : return 1;
720 : }
721 :
722 : /*
723 : * OCSP helper: this is *not* a full OCSP check. It just checks that each CA
724 : * is valid. Additional checks must be made on the chain.
725 : */
726 :
727 0 : static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca)
728 : {
729 : /*
730 : * Must be a valid CA. Should we really support the "I don't know" value
731 : * (2)?
732 : */
733 0 : if (ca)
734 0 : return check_ca(x);
735 : /* leaf certificate is checked in OCSP_verify() */
736 : return 1;
737 : }
738 :
739 0 : static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x,
740 : int ca)
741 : {
742 : int i_ext;
743 :
744 : /* If ca is true we must return if this is a valid CA certificate. */
745 0 : if (ca)
746 0 : return check_ca(x);
747 :
748 : /*
749 : * Check the optional key usage field:
750 : * if Key Usage is present, it must be one of digitalSignature
751 : * and/or nonRepudiation (other values are not consistent and shall
752 : * be rejected).
753 : */
754 0 : if ((x->ex_flags & EXFLAG_KUSAGE)
755 0 : && ((x->ex_kusage & ~(KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE)) ||
756 0 : !(x->ex_kusage & (KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE))))
757 : return 0;
758 :
759 : /* Only time stamp key usage is permitted and it's required. */
760 0 : if (!(x->ex_flags & EXFLAG_XKUSAGE) || x->ex_xkusage != XKU_TIMESTAMP)
761 : return 0;
762 :
763 : /* Extended Key Usage MUST be critical */
764 0 : i_ext = X509_get_ext_by_NID((X509 *)x, NID_ext_key_usage, -1);
765 0 : if (i_ext >= 0) {
766 0 : X509_EXTENSION *ext = X509_get_ext((X509 *)x, i_ext);
767 0 : if (!X509_EXTENSION_get_critical(ext))
768 : return 0;
769 : }
770 :
771 : return 1;
772 : }
773 :
774 0 : static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca)
775 : {
776 0 : return 1;
777 : }
778 :
779 : /*-
780 : * Various checks to see if one certificate issued the second.
781 : * This can be used to prune a set of possible issuer certificates
782 : * which have been looked up using some simple method such as by
783 : * subject name.
784 : * These are:
785 : * 1. Check issuer_name(subject) == subject_name(issuer)
786 : * 2. If akid(subject) exists check it matches issuer
787 : * 3. If key_usage(issuer) exists check it supports certificate signing
788 : * returns 0 for OK, positive for reason for mismatch, reasons match
789 : * codes for X509_verify_cert()
790 : */
791 :
792 1110 : int X509_check_issued(X509 *issuer, X509 *subject)
793 : {
794 1110 : if (X509_NAME_cmp(X509_get_subject_name(issuer),
795 1110 : X509_get_issuer_name(subject)))
796 : return X509_V_ERR_SUBJECT_ISSUER_MISMATCH;
797 740 : x509v3_cache_extensions(issuer);
798 740 : x509v3_cache_extensions(subject);
799 :
800 740 : if (subject->akid) {
801 0 : int ret = X509_check_akid(issuer, subject->akid);
802 0 : if (ret != X509_V_OK)
803 : return ret;
804 : }
805 :
806 740 : if (subject->ex_flags & EXFLAG_PROXY) {
807 0 : if (ku_reject(issuer, KU_DIGITAL_SIGNATURE))
808 : return X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE;
809 740 : } else if (ku_reject(issuer, KU_KEY_CERT_SIGN))
810 : return X509_V_ERR_KEYUSAGE_NO_CERTSIGN;
811 740 : return X509_V_OK;
812 : }
813 :
814 330 : int X509_check_akid(X509 *issuer, AUTHORITY_KEYID *akid)
815 : {
816 :
817 330 : if (!akid)
818 : return X509_V_OK;
819 :
820 : /* Check key ids (if present) */
821 0 : if (akid->keyid && issuer->skid &&
822 0 : ASN1_OCTET_STRING_cmp(akid->keyid, issuer->skid))
823 : return X509_V_ERR_AKID_SKID_MISMATCH;
824 : /* Check serial number */
825 0 : if (akid->serial &&
826 0 : ASN1_INTEGER_cmp(X509_get_serialNumber(issuer), akid->serial))
827 : return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;
828 : /* Check issuer name */
829 0 : if (akid->issuer) {
830 : /*
831 : * Ugh, for some peculiar reason AKID includes SEQUENCE OF
832 : * GeneralName. So look for a DirName. There may be more than one but
833 : * we only take any notice of the first.
834 : */
835 : GENERAL_NAMES *gens;
836 : GENERAL_NAME *gen;
837 : X509_NAME *nm = NULL;
838 : int i;
839 : gens = akid->issuer;
840 0 : for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
841 0 : gen = sk_GENERAL_NAME_value(gens, i);
842 0 : if (gen->type == GEN_DIRNAME) {
843 0 : nm = gen->d.dirn;
844 0 : break;
845 : }
846 : }
847 0 : if (nm && X509_NAME_cmp(nm, X509_get_issuer_name(issuer)))
848 : return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;
849 : }
850 : return X509_V_OK;
851 : }
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