source: EcnlProtoTool/trunk/openssl-1.1.0e/crypto/x509v3/v3_purp.c@ 331

Last change on this file since 331 was 331, checked in by coas-nagasima, 6 years ago

prototoolに関連するプロジェクトをnewlibからmuslを使うよう変更・更新
ntshellをnewlibの下位の実装から、muslのsyscallの実装に変更・更新
以下のOSSをアップデート
・mruby-1.3.0
・musl-1.1.18
・onigmo-6.1.3
・tcc-0.9.27
以下のOSSを追加
・openssl-1.1.0e
・curl-7.57.0
・zlib-1.2.11
以下のmrbgemsを追加
・iij/mruby-digest
・iij/mruby-env
・iij/mruby-errno
・iij/mruby-iijson
・iij/mruby-ipaddr
・iij/mruby-mock
・iij/mruby-require
・iij/mruby-tls-openssl
  • Property svn:eol-style set to native
  • Property svn:mime-type set to text/x-csrc
File size: 25.4 KB
Line 
1/*
2 * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11#include "internal/cryptlib.h"
12#include "internal/numbers.h"
13#include <openssl/x509v3.h>
14#include <openssl/x509_vfy.h>
15#include "internal/x509_int.h"
16
17static void x509v3_cache_extensions(X509 *x);
18
19static int check_ssl_ca(const X509 *x);
20static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x,
21 int ca);
22static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x,
23 int ca);
24static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x,
25 int ca);
26static int purpose_smime(const X509 *x, int ca);
27static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x,
28 int ca);
29static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x,
30 int ca);
31static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x,
32 int ca);
33static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x,
34 int ca);
35static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca);
36static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca);
37
38static int xp_cmp(const X509_PURPOSE *const *a, const X509_PURPOSE *const *b);
39static void xptable_free(X509_PURPOSE *p);
40
41static X509_PURPOSE xstandard[] = {
42 {X509_PURPOSE_SSL_CLIENT, X509_TRUST_SSL_CLIENT, 0,
43 check_purpose_ssl_client, "SSL client", "sslclient", NULL},
44 {X509_PURPOSE_SSL_SERVER, X509_TRUST_SSL_SERVER, 0,
45 check_purpose_ssl_server, "SSL server", "sslserver", NULL},
46 {X509_PURPOSE_NS_SSL_SERVER, X509_TRUST_SSL_SERVER, 0,
47 check_purpose_ns_ssl_server, "Netscape SSL server", "nssslserver", NULL},
48 {X509_PURPOSE_SMIME_SIGN, X509_TRUST_EMAIL, 0, check_purpose_smime_sign,
49 "S/MIME signing", "smimesign", NULL},
50 {X509_PURPOSE_SMIME_ENCRYPT, X509_TRUST_EMAIL, 0,
51 check_purpose_smime_encrypt, "S/MIME encryption", "smimeencrypt", NULL},
52 {X509_PURPOSE_CRL_SIGN, X509_TRUST_COMPAT, 0, check_purpose_crl_sign,
53 "CRL signing", "crlsign", NULL},
54 {X509_PURPOSE_ANY, X509_TRUST_DEFAULT, 0, no_check, "Any Purpose", "any",
55 NULL},
56 {X509_PURPOSE_OCSP_HELPER, X509_TRUST_COMPAT, 0, ocsp_helper,
57 "OCSP helper", "ocsphelper", NULL},
58 {X509_PURPOSE_TIMESTAMP_SIGN, X509_TRUST_TSA, 0,
59 check_purpose_timestamp_sign, "Time Stamp signing", "timestampsign",
60 NULL},
61};
62
63#define X509_PURPOSE_COUNT OSSL_NELEM(xstandard)
64
65static STACK_OF(X509_PURPOSE) *xptable = NULL;
66
67static int xp_cmp(const X509_PURPOSE *const *a, const X509_PURPOSE *const *b)
68{
69 return (*a)->purpose - (*b)->purpose;
70}
71
72/*
73 * As much as I'd like to make X509_check_purpose use a "const" X509* I
74 * really can't because it does recalculate hashes and do other non-const
75 * things.
76 */
77int X509_check_purpose(X509 *x, int id, int ca)
78{
79 int idx;
80 const X509_PURPOSE *pt;
81 if (!(x->ex_flags & EXFLAG_SET)) {
82 CRYPTO_THREAD_write_lock(x->lock);
83 x509v3_cache_extensions(x);
84 CRYPTO_THREAD_unlock(x->lock);
85 }
86 /* Return if side-effect only call */
87 if (id == -1)
88 return 1;
89 idx = X509_PURPOSE_get_by_id(id);
90 if (idx == -1)
91 return -1;
92 pt = X509_PURPOSE_get0(idx);
93 return pt->check_purpose(pt, x, ca);
94}
95
96int X509_PURPOSE_set(int *p, int purpose)
97{
98 if (X509_PURPOSE_get_by_id(purpose) == -1) {
99 X509V3err(X509V3_F_X509_PURPOSE_SET, X509V3_R_INVALID_PURPOSE);
100 return 0;
101 }
102 *p = purpose;
103 return 1;
104}
105
106int X509_PURPOSE_get_count(void)
107{
108 if (!xptable)
109 return X509_PURPOSE_COUNT;
110 return sk_X509_PURPOSE_num(xptable) + X509_PURPOSE_COUNT;
111}
112
113X509_PURPOSE *X509_PURPOSE_get0(int idx)
114{
115 if (idx < 0)
116 return NULL;
117 if (idx < (int)X509_PURPOSE_COUNT)
118 return xstandard + idx;
119 return sk_X509_PURPOSE_value(xptable, idx - X509_PURPOSE_COUNT);
120}
121
122int X509_PURPOSE_get_by_sname(const char *sname)
123{
124 int i;
125 X509_PURPOSE *xptmp;
126 for (i = 0; i < X509_PURPOSE_get_count(); i++) {
127 xptmp = X509_PURPOSE_get0(i);
128 if (strcmp(xptmp->sname, sname) == 0)
129 return i;
130 }
131 return -1;
132}
133
134int X509_PURPOSE_get_by_id(int purpose)
135{
136 X509_PURPOSE tmp;
137 int idx;
138 if ((purpose >= X509_PURPOSE_MIN) && (purpose <= X509_PURPOSE_MAX))
139 return purpose - X509_PURPOSE_MIN;
140 tmp.purpose = purpose;
141 if (!xptable)
142 return -1;
143 idx = sk_X509_PURPOSE_find(xptable, &tmp);
144 if (idx == -1)
145 return -1;
146 return idx + X509_PURPOSE_COUNT;
147}
148
149int X509_PURPOSE_add(int id, int trust, int flags,
150 int (*ck) (const X509_PURPOSE *, const X509 *, int),
151 const char *name, const char *sname, void *arg)
152{
153 int idx;
154 X509_PURPOSE *ptmp;
155 /*
156 * This is set according to what we change: application can't set it
157 */
158 flags &= ~X509_PURPOSE_DYNAMIC;
159 /* This will always be set for application modified trust entries */
160 flags |= X509_PURPOSE_DYNAMIC_NAME;
161 /* Get existing entry if any */
162 idx = X509_PURPOSE_get_by_id(id);
163 /* Need a new entry */
164 if (idx == -1) {
165 if ((ptmp = OPENSSL_malloc(sizeof(*ptmp))) == NULL) {
166 X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE);
167 return 0;
168 }
169 ptmp->flags = X509_PURPOSE_DYNAMIC;
170 } else
171 ptmp = X509_PURPOSE_get0(idx);
172
173 /* OPENSSL_free existing name if dynamic */
174 if (ptmp->flags & X509_PURPOSE_DYNAMIC_NAME) {
175 OPENSSL_free(ptmp->name);
176 OPENSSL_free(ptmp->sname);
177 }
178 /* dup supplied name */
179 ptmp->name = OPENSSL_strdup(name);
180 ptmp->sname = OPENSSL_strdup(sname);
181 if (!ptmp->name || !ptmp->sname) {
182 X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE);
183 goto err;
184 }
185 /* Keep the dynamic flag of existing entry */
186 ptmp->flags &= X509_PURPOSE_DYNAMIC;
187 /* Set all other flags */
188 ptmp->flags |= flags;
189
190 ptmp->purpose = id;
191 ptmp->trust = trust;
192 ptmp->check_purpose = ck;
193 ptmp->usr_data = arg;
194
195 /* If its a new entry manage the dynamic table */
196 if (idx == -1) {
197 if (xptable == NULL
198 && (xptable = sk_X509_PURPOSE_new(xp_cmp)) == NULL) {
199 X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE);
200 goto err;
201 }
202 if (!sk_X509_PURPOSE_push(xptable, ptmp)) {
203 X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE);
204 goto err;
205 }
206 }
207 return 1;
208 err:
209 if (idx == -1) {
210 OPENSSL_free(ptmp->name);
211 OPENSSL_free(ptmp->sname);
212 OPENSSL_free(ptmp);
213 }
214 return 0;
215}
216
217static void xptable_free(X509_PURPOSE *p)
218{
219 if (!p)
220 return;
221 if (p->flags & X509_PURPOSE_DYNAMIC) {
222 if (p->flags & X509_PURPOSE_DYNAMIC_NAME) {
223 OPENSSL_free(p->name);
224 OPENSSL_free(p->sname);
225 }
226 OPENSSL_free(p);
227 }
228}
229
230void X509_PURPOSE_cleanup(void)
231{
232 sk_X509_PURPOSE_pop_free(xptable, xptable_free);
233 xptable = NULL;
234}
235
236int X509_PURPOSE_get_id(const X509_PURPOSE *xp)
237{
238 return xp->purpose;
239}
240
241char *X509_PURPOSE_get0_name(const X509_PURPOSE *xp)
242{
243 return xp->name;
244}
245
246char *X509_PURPOSE_get0_sname(const X509_PURPOSE *xp)
247{
248 return xp->sname;
249}
250
251int X509_PURPOSE_get_trust(const X509_PURPOSE *xp)
252{
253 return xp->trust;
254}
255
256static int nid_cmp(const int *a, const int *b)
257{
258 return *a - *b;
259}
260
261DECLARE_OBJ_BSEARCH_CMP_FN(int, int, nid);
262IMPLEMENT_OBJ_BSEARCH_CMP_FN(int, int, nid);
263
264int X509_supported_extension(X509_EXTENSION *ex)
265{
266 /*
267 * This table is a list of the NIDs of supported extensions: that is
268 * those which are used by the verify process. If an extension is
269 * critical and doesn't appear in this list then the verify process will
270 * normally reject the certificate. The list must be kept in numerical
271 * order because it will be searched using bsearch.
272 */
273
274 static const int supported_nids[] = {
275 NID_netscape_cert_type, /* 71 */
276 NID_key_usage, /* 83 */
277 NID_subject_alt_name, /* 85 */
278 NID_basic_constraints, /* 87 */
279 NID_certificate_policies, /* 89 */
280 NID_ext_key_usage, /* 126 */
281#ifndef OPENSSL_NO_RFC3779
282 NID_sbgp_ipAddrBlock, /* 290 */
283 NID_sbgp_autonomousSysNum, /* 291 */
284#endif
285 NID_policy_constraints, /* 401 */
286 NID_proxyCertInfo, /* 663 */
287 NID_name_constraints, /* 666 */
288 NID_policy_mappings, /* 747 */
289 NID_inhibit_any_policy /* 748 */
290 };
291
292 int ex_nid = OBJ_obj2nid(X509_EXTENSION_get_object(ex));
293
294 if (ex_nid == NID_undef)
295 return 0;
296
297 if (OBJ_bsearch_nid(&ex_nid, supported_nids, OSSL_NELEM(supported_nids)))
298 return 1;
299 return 0;
300}
301
302static void setup_dp(X509 *x, DIST_POINT *dp)
303{
304 X509_NAME *iname = NULL;
305 int i;
306 if (dp->reasons) {
307 if (dp->reasons->length > 0)
308 dp->dp_reasons = dp->reasons->data[0];
309 if (dp->reasons->length > 1)
310 dp->dp_reasons |= (dp->reasons->data[1] << 8);
311 dp->dp_reasons &= CRLDP_ALL_REASONS;
312 } else
313 dp->dp_reasons = CRLDP_ALL_REASONS;
314 if (!dp->distpoint || (dp->distpoint->type != 1))
315 return;
316 for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++) {
317 GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i);
318 if (gen->type == GEN_DIRNAME) {
319 iname = gen->d.directoryName;
320 break;
321 }
322 }
323 if (!iname)
324 iname = X509_get_issuer_name(x);
325
326 DIST_POINT_set_dpname(dp->distpoint, iname);
327
328}
329
330static void setup_crldp(X509 *x)
331{
332 int i;
333 x->crldp = X509_get_ext_d2i(x, NID_crl_distribution_points, NULL, NULL);
334 for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++)
335 setup_dp(x, sk_DIST_POINT_value(x->crldp, i));
336}
337
338#define V1_ROOT (EXFLAG_V1|EXFLAG_SS)
339#define ku_reject(x, usage) \
340 (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage)))
341#define xku_reject(x, usage) \
342 (((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage)))
343#define ns_reject(x, usage) \
344 (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage)))
345
346static void x509v3_cache_extensions(X509 *x)
347{
348 BASIC_CONSTRAINTS *bs;
349 PROXY_CERT_INFO_EXTENSION *pci;
350 ASN1_BIT_STRING *usage;
351 ASN1_BIT_STRING *ns;
352 EXTENDED_KEY_USAGE *extusage;
353 X509_EXTENSION *ex;
354
355 int i;
356 if (x->ex_flags & EXFLAG_SET)
357 return;
358 X509_digest(x, EVP_sha1(), x->sha1_hash, NULL);
359 /* V1 should mean no extensions ... */
360 if (!X509_get_version(x))
361 x->ex_flags |= EXFLAG_V1;
362 /* Handle basic constraints */
363 if ((bs = X509_get_ext_d2i(x, NID_basic_constraints, NULL, NULL))) {
364 if (bs->ca)
365 x->ex_flags |= EXFLAG_CA;
366 if (bs->pathlen) {
367 if ((bs->pathlen->type == V_ASN1_NEG_INTEGER)
368 || !bs->ca) {
369 x->ex_flags |= EXFLAG_INVALID;
370 x->ex_pathlen = 0;
371 } else
372 x->ex_pathlen = ASN1_INTEGER_get(bs->pathlen);
373 } else
374 x->ex_pathlen = -1;
375 BASIC_CONSTRAINTS_free(bs);
376 x->ex_flags |= EXFLAG_BCONS;
377 }
378 /* Handle proxy certificates */
379 if ((pci = X509_get_ext_d2i(x, NID_proxyCertInfo, NULL, NULL))) {
380 if (x->ex_flags & EXFLAG_CA
381 || X509_get_ext_by_NID(x, NID_subject_alt_name, -1) >= 0
382 || X509_get_ext_by_NID(x, NID_issuer_alt_name, -1) >= 0) {
383 x->ex_flags |= EXFLAG_INVALID;
384 }
385 if (pci->pcPathLengthConstraint) {
386 x->ex_pcpathlen = ASN1_INTEGER_get(pci->pcPathLengthConstraint);
387 } else
388 x->ex_pcpathlen = -1;
389 PROXY_CERT_INFO_EXTENSION_free(pci);
390 x->ex_flags |= EXFLAG_PROXY;
391 }
392 /* Handle key usage */
393 if ((usage = X509_get_ext_d2i(x, NID_key_usage, NULL, NULL))) {
394 if (usage->length > 0) {
395 x->ex_kusage = usage->data[0];
396 if (usage->length > 1)
397 x->ex_kusage |= usage->data[1] << 8;
398 } else
399 x->ex_kusage = 0;
400 x->ex_flags |= EXFLAG_KUSAGE;
401 ASN1_BIT_STRING_free(usage);
402 }
403 x->ex_xkusage = 0;
404 if ((extusage = X509_get_ext_d2i(x, NID_ext_key_usage, NULL, NULL))) {
405 x->ex_flags |= EXFLAG_XKUSAGE;
406 for (i = 0; i < sk_ASN1_OBJECT_num(extusage); i++) {
407 switch (OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage, i))) {
408 case NID_server_auth:
409 x->ex_xkusage |= XKU_SSL_SERVER;
410 break;
411
412 case NID_client_auth:
413 x->ex_xkusage |= XKU_SSL_CLIENT;
414 break;
415
416 case NID_email_protect:
417 x->ex_xkusage |= XKU_SMIME;
418 break;
419
420 case NID_code_sign:
421 x->ex_xkusage |= XKU_CODE_SIGN;
422 break;
423
424 case NID_ms_sgc:
425 case NID_ns_sgc:
426 x->ex_xkusage |= XKU_SGC;
427 break;
428
429 case NID_OCSP_sign:
430 x->ex_xkusage |= XKU_OCSP_SIGN;
431 break;
432
433 case NID_time_stamp:
434 x->ex_xkusage |= XKU_TIMESTAMP;
435 break;
436
437 case NID_dvcs:
438 x->ex_xkusage |= XKU_DVCS;
439 break;
440
441 case NID_anyExtendedKeyUsage:
442 x->ex_xkusage |= XKU_ANYEKU;
443 break;
444 }
445 }
446 sk_ASN1_OBJECT_pop_free(extusage, ASN1_OBJECT_free);
447 }
448
449 if ((ns = X509_get_ext_d2i(x, NID_netscape_cert_type, NULL, NULL))) {
450 if (ns->length > 0)
451 x->ex_nscert = ns->data[0];
452 else
453 x->ex_nscert = 0;
454 x->ex_flags |= EXFLAG_NSCERT;
455 ASN1_BIT_STRING_free(ns);
456 }
457 x->skid = X509_get_ext_d2i(x, NID_subject_key_identifier, NULL, NULL);
458 x->akid = X509_get_ext_d2i(x, NID_authority_key_identifier, NULL, NULL);
459 /* Does subject name match issuer ? */
460 if (!X509_NAME_cmp(X509_get_subject_name(x), X509_get_issuer_name(x))) {
461 x->ex_flags |= EXFLAG_SI;
462 /* If SKID matches AKID also indicate self signed */
463 if (X509_check_akid(x, x->akid) == X509_V_OK &&
464 !ku_reject(x, KU_KEY_CERT_SIGN))
465 x->ex_flags |= EXFLAG_SS;
466 }
467 x->altname = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
468 x->nc = X509_get_ext_d2i(x, NID_name_constraints, &i, NULL);
469 if (!x->nc && (i != -1))
470 x->ex_flags |= EXFLAG_INVALID;
471 setup_crldp(x);
472
473#ifndef OPENSSL_NO_RFC3779
474 x->rfc3779_addr = X509_get_ext_d2i(x, NID_sbgp_ipAddrBlock, NULL, NULL);
475 x->rfc3779_asid = X509_get_ext_d2i(x, NID_sbgp_autonomousSysNum,
476 NULL, NULL);
477#endif
478 for (i = 0; i < X509_get_ext_count(x); i++) {
479 ex = X509_get_ext(x, i);
480 if (OBJ_obj2nid(X509_EXTENSION_get_object(ex))
481 == NID_freshest_crl)
482 x->ex_flags |= EXFLAG_FRESHEST;
483 if (!X509_EXTENSION_get_critical(ex))
484 continue;
485 if (!X509_supported_extension(ex)) {
486 x->ex_flags |= EXFLAG_CRITICAL;
487 break;
488 }
489 }
490 x->ex_flags |= EXFLAG_SET;
491}
492
493/*-
494 * CA checks common to all purposes
495 * return codes:
496 * 0 not a CA
497 * 1 is a CA
498 * 2 basicConstraints absent so "maybe" a CA
499 * 3 basicConstraints absent but self signed V1.
500 * 4 basicConstraints absent but keyUsage present and keyCertSign asserted.
501 */
502
503static int check_ca(const X509 *x)
504{
505 /* keyUsage if present should allow cert signing */
506 if (ku_reject(x, KU_KEY_CERT_SIGN))
507 return 0;
508 if (x->ex_flags & EXFLAG_BCONS) {
509 if (x->ex_flags & EXFLAG_CA)
510 return 1;
511 /* If basicConstraints says not a CA then say so */
512 else
513 return 0;
514 } else {
515 /* we support V1 roots for... uh, I don't really know why. */
516 if ((x->ex_flags & V1_ROOT) == V1_ROOT)
517 return 3;
518 /*
519 * If key usage present it must have certSign so tolerate it
520 */
521 else if (x->ex_flags & EXFLAG_KUSAGE)
522 return 4;
523 /* Older certificates could have Netscape-specific CA types */
524 else if (x->ex_flags & EXFLAG_NSCERT && x->ex_nscert & NS_ANY_CA)
525 return 5;
526 /* can this still be regarded a CA certificate? I doubt it */
527 return 0;
528 }
529}
530
531void X509_set_proxy_flag(X509 *x)
532{
533 x->ex_flags |= EXFLAG_PROXY;
534}
535
536void X509_set_proxy_pathlen(X509 *x, long l)
537{
538 x->ex_pcpathlen = l;
539}
540
541int X509_check_ca(X509 *x)
542{
543 if (!(x->ex_flags & EXFLAG_SET)) {
544 CRYPTO_THREAD_write_lock(x->lock);
545 x509v3_cache_extensions(x);
546 CRYPTO_THREAD_unlock(x->lock);
547 }
548
549 return check_ca(x);
550}
551
552/* Check SSL CA: common checks for SSL client and server */
553static int check_ssl_ca(const X509 *x)
554{
555 int ca_ret;
556 ca_ret = check_ca(x);
557 if (!ca_ret)
558 return 0;
559 /* check nsCertType if present */
560 if (ca_ret != 5 || x->ex_nscert & NS_SSL_CA)
561 return ca_ret;
562 else
563 return 0;
564}
565
566static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x,
567 int ca)
568{
569 if (xku_reject(x, XKU_SSL_CLIENT))
570 return 0;
571 if (ca)
572 return check_ssl_ca(x);
573 /* We need to do digital signatures or key agreement */
574 if (ku_reject(x, KU_DIGITAL_SIGNATURE | KU_KEY_AGREEMENT))
575 return 0;
576 /* nsCertType if present should allow SSL client use */
577 if (ns_reject(x, NS_SSL_CLIENT))
578 return 0;
579 return 1;
580}
581
582/*
583 * Key usage needed for TLS/SSL server: digital signature, encipherment or
584 * key agreement. The ssl code can check this more thoroughly for individual
585 * key types.
586 */
587#define KU_TLS \
588 KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT|KU_KEY_AGREEMENT
589
590static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x,
591 int ca)
592{
593 if (xku_reject(x, XKU_SSL_SERVER | XKU_SGC))
594 return 0;
595 if (ca)
596 return check_ssl_ca(x);
597
598 if (ns_reject(x, NS_SSL_SERVER))
599 return 0;
600 if (ku_reject(x, KU_TLS))
601 return 0;
602
603 return 1;
604
605}
606
607static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x,
608 int ca)
609{
610 int ret;
611 ret = check_purpose_ssl_server(xp, x, ca);
612 if (!ret || ca)
613 return ret;
614 /* We need to encipher or Netscape complains */
615 if (ku_reject(x, KU_KEY_ENCIPHERMENT))
616 return 0;
617 return ret;
618}
619
620/* common S/MIME checks */
621static int purpose_smime(const X509 *x, int ca)
622{
623 if (xku_reject(x, XKU_SMIME))
624 return 0;
625 if (ca) {
626 int ca_ret;
627 ca_ret = check_ca(x);
628 if (!ca_ret)
629 return 0;
630 /* check nsCertType if present */
631 if (ca_ret != 5 || x->ex_nscert & NS_SMIME_CA)
632 return ca_ret;
633 else
634 return 0;
635 }
636 if (x->ex_flags & EXFLAG_NSCERT) {
637 if (x->ex_nscert & NS_SMIME)
638 return 1;
639 /* Workaround for some buggy certificates */
640 if (x->ex_nscert & NS_SSL_CLIENT)
641 return 2;
642 return 0;
643 }
644 return 1;
645}
646
647static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x,
648 int ca)
649{
650 int ret;
651 ret = purpose_smime(x, ca);
652 if (!ret || ca)
653 return ret;
654 if (ku_reject(x, KU_DIGITAL_SIGNATURE | KU_NON_REPUDIATION))
655 return 0;
656 return ret;
657}
658
659static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x,
660 int ca)
661{
662 int ret;
663 ret = purpose_smime(x, ca);
664 if (!ret || ca)
665 return ret;
666 if (ku_reject(x, KU_KEY_ENCIPHERMENT))
667 return 0;
668 return ret;
669}
670
671static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x,
672 int ca)
673{
674 if (ca) {
675 int ca_ret;
676 if ((ca_ret = check_ca(x)) != 2)
677 return ca_ret;
678 else
679 return 0;
680 }
681 if (ku_reject(x, KU_CRL_SIGN))
682 return 0;
683 return 1;
684}
685
686/*
687 * OCSP helper: this is *not* a full OCSP check. It just checks that each CA
688 * is valid. Additional checks must be made on the chain.
689 */
690
691static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca)
692{
693 /*
694 * Must be a valid CA. Should we really support the "I don't know" value
695 * (2)?
696 */
697 if (ca)
698 return check_ca(x);
699 /* leaf certificate is checked in OCSP_verify() */
700 return 1;
701}
702
703static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x,
704 int ca)
705{
706 int i_ext;
707
708 /* If ca is true we must return if this is a valid CA certificate. */
709 if (ca)
710 return check_ca(x);
711
712 /*
713 * Check the optional key usage field:
714 * if Key Usage is present, it must be one of digitalSignature
715 * and/or nonRepudiation (other values are not consistent and shall
716 * be rejected).
717 */
718 if ((x->ex_flags & EXFLAG_KUSAGE)
719 && ((x->ex_kusage & ~(KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE)) ||
720 !(x->ex_kusage & (KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE))))
721 return 0;
722
723 /* Only time stamp key usage is permitted and it's required. */
724 if (!(x->ex_flags & EXFLAG_XKUSAGE) || x->ex_xkusage != XKU_TIMESTAMP)
725 return 0;
726
727 /* Extended Key Usage MUST be critical */
728 i_ext = X509_get_ext_by_NID(x, NID_ext_key_usage, -1);
729 if (i_ext >= 0) {
730 X509_EXTENSION *ext = X509_get_ext((X509 *)x, i_ext);
731 if (!X509_EXTENSION_get_critical(ext))
732 return 0;
733 }
734
735 return 1;
736}
737
738static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca)
739{
740 return 1;
741}
742
743/*-
744 * Various checks to see if one certificate issued the second.
745 * This can be used to prune a set of possible issuer certificates
746 * which have been looked up using some simple method such as by
747 * subject name.
748 * These are:
749 * 1. Check issuer_name(subject) == subject_name(issuer)
750 * 2. If akid(subject) exists check it matches issuer
751 * 3. If key_usage(issuer) exists check it supports certificate signing
752 * returns 0 for OK, positive for reason for mismatch, reasons match
753 * codes for X509_verify_cert()
754 */
755
756int X509_check_issued(X509 *issuer, X509 *subject)
757{
758 if (X509_NAME_cmp(X509_get_subject_name(issuer),
759 X509_get_issuer_name(subject)))
760 return X509_V_ERR_SUBJECT_ISSUER_MISMATCH;
761 x509v3_cache_extensions(issuer);
762 x509v3_cache_extensions(subject);
763
764 if (subject->akid) {
765 int ret = X509_check_akid(issuer, subject->akid);
766 if (ret != X509_V_OK)
767 return ret;
768 }
769
770 if (subject->ex_flags & EXFLAG_PROXY) {
771 if (ku_reject(issuer, KU_DIGITAL_SIGNATURE))
772 return X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE;
773 } else if (ku_reject(issuer, KU_KEY_CERT_SIGN))
774 return X509_V_ERR_KEYUSAGE_NO_CERTSIGN;
775 return X509_V_OK;
776}
777
778int X509_check_akid(X509 *issuer, AUTHORITY_KEYID *akid)
779{
780
781 if (!akid)
782 return X509_V_OK;
783
784 /* Check key ids (if present) */
785 if (akid->keyid && issuer->skid &&
786 ASN1_OCTET_STRING_cmp(akid->keyid, issuer->skid))
787 return X509_V_ERR_AKID_SKID_MISMATCH;
788 /* Check serial number */
789 if (akid->serial &&
790 ASN1_INTEGER_cmp(X509_get_serialNumber(issuer), akid->serial))
791 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;
792 /* Check issuer name */
793 if (akid->issuer) {
794 /*
795 * Ugh, for some peculiar reason AKID includes SEQUENCE OF
796 * GeneralName. So look for a DirName. There may be more than one but
797 * we only take any notice of the first.
798 */
799 GENERAL_NAMES *gens;
800 GENERAL_NAME *gen;
801 X509_NAME *nm = NULL;
802 int i;
803 gens = akid->issuer;
804 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
805 gen = sk_GENERAL_NAME_value(gens, i);
806 if (gen->type == GEN_DIRNAME) {
807 nm = gen->d.dirn;
808 break;
809 }
810 }
811 if (nm && X509_NAME_cmp(nm, X509_get_issuer_name(issuer)))
812 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;
813 }
814 return X509_V_OK;
815}
816
817uint32_t X509_get_extension_flags(X509 *x)
818{
819 /* Call for side-effect of computing hash and caching extensions */
820 X509_check_purpose(x, -1, -1);
821 return x->ex_flags;
822}
823
824uint32_t X509_get_key_usage(X509 *x)
825{
826 /* Call for side-effect of computing hash and caching extensions */
827 X509_check_purpose(x, -1, -1);
828 if (x->ex_flags & EXFLAG_KUSAGE)
829 return x->ex_kusage;
830 return UINT32_MAX;
831}
832
833uint32_t X509_get_extended_key_usage(X509 *x)
834{
835 /* Call for side-effect of computing hash and caching extensions */
836 X509_check_purpose(x, -1, -1);
837 if (x->ex_flags & EXFLAG_XKUSAGE)
838 return x->ex_xkusage;
839 return UINT32_MAX;
840}
841
842const ASN1_OCTET_STRING *X509_get0_subject_key_id(X509 *x)
843{
844 /* Call for side-effect of computing hash and caching extensions */
845 X509_check_purpose(x, -1, -1);
846 return x->skid;
847}
848
849long X509_get_pathlen(X509 *x)
850{
851 /* Called for side effect of caching extensions */
852 if (X509_check_purpose(x, -1, -1) != 1
853 || (x->ex_flags & EXFLAG_BCONS) == 0)
854 return -1;
855 return x->ex_pathlen;
856}
857
858long X509_get_proxy_pathlen(X509 *x)
859{
860 /* Called for side effect of caching extensions */
861 if (X509_check_purpose(x, -1, -1) != 1
862 || (x->ex_flags & EXFLAG_PROXY) == 0)
863 return -1;
864 return x->ex_pcpathlen;
865}
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