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Commit | Line | Data |
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673b102c | 1 | /* v3_purp.c */ |
0f113f3e MC |
2 | /* |
3 | * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project | |
4 | * 2001. | |
673b102c DSH |
5 | */ |
6 | /* ==================================================================== | |
bc501570 | 7 | * Copyright (c) 1999-2004 The OpenSSL Project. All rights reserved. |
673b102c DSH |
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 | |
0f113f3e | 14 | * notice, this list of conditions and the following disclaimer. |
673b102c DSH |
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> | |
b39fc560 | 61 | #include "internal/cryptlib.h" |
1912c5d8 | 62 | #include "internal/numbers.h" |
673b102c | 63 | #include <openssl/x509v3.h> |
2f043896 | 64 | #include <openssl/x509_vfy.h> |
d19a50c9 | 65 | #include "internal/x509_int.h" |
673b102c | 66 | |
ce1b4fe1 | 67 | static void x509v3_cache_extensions(X509 *x); |
673b102c | 68 | |
ccd86b68 | 69 | static int check_ssl_ca(const X509 *x); |
0f113f3e MC |
70 | static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x, |
71 | int ca); | |
72 | static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x, | |
73 | int ca); | |
74 | static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x, | |
75 | int ca); | |
ccd86b68 | 76 | static int purpose_smime(const X509 *x, int ca); |
0f113f3e MC |
77 | static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x, |
78 | int ca); | |
79 | static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x, | |
80 | int ca); | |
81 | static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x, | |
82 | int ca); | |
83 | static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x, | |
84 | int ca); | |
ccd86b68 | 85 | static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca); |
81f169e9 | 86 | static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca); |
ccd86b68 | 87 | |
0f113f3e | 88 | static int xp_cmp(const X509_PURPOSE *const *a, const X509_PURPOSE *const *b); |
d4cec6a1 | 89 | static void xptable_free(X509_PURPOSE *p); |
673b102c DSH |
90 | |
91 | static X509_PURPOSE xstandard[] = { | |
0f113f3e MC |
92 | {X509_PURPOSE_SSL_CLIENT, X509_TRUST_SSL_CLIENT, 0, |
93 | check_purpose_ssl_client, "SSL client", "sslclient", NULL}, | |
94 | {X509_PURPOSE_SSL_SERVER, X509_TRUST_SSL_SERVER, 0, | |
95 | check_purpose_ssl_server, "SSL server", "sslserver", NULL}, | |
96 | {X509_PURPOSE_NS_SSL_SERVER, X509_TRUST_SSL_SERVER, 0, | |
97 | check_purpose_ns_ssl_server, "Netscape SSL server", "nssslserver", NULL}, | |
98 | {X509_PURPOSE_SMIME_SIGN, X509_TRUST_EMAIL, 0, check_purpose_smime_sign, | |
99 | "S/MIME signing", "smimesign", NULL}, | |
100 | {X509_PURPOSE_SMIME_ENCRYPT, X509_TRUST_EMAIL, 0, | |
101 | check_purpose_smime_encrypt, "S/MIME encryption", "smimeencrypt", NULL}, | |
102 | {X509_PURPOSE_CRL_SIGN, X509_TRUST_COMPAT, 0, check_purpose_crl_sign, | |
103 | "CRL signing", "crlsign", NULL}, | |
104 | {X509_PURPOSE_ANY, X509_TRUST_DEFAULT, 0, no_check, "Any Purpose", "any", | |
105 | NULL}, | |
106 | {X509_PURPOSE_OCSP_HELPER, X509_TRUST_COMPAT, 0, ocsp_helper, | |
107 | "OCSP helper", "ocsphelper", NULL}, | |
108 | {X509_PURPOSE_TIMESTAMP_SIGN, X509_TRUST_TSA, 0, | |
109 | check_purpose_timestamp_sign, "Time Stamp signing", "timestampsign", | |
110 | NULL}, | |
673b102c DSH |
111 | }; |
112 | ||
b6eb9827 | 113 | #define X509_PURPOSE_COUNT OSSL_NELEM(xstandard) |
dd413410 | 114 | |
79875776 | 115 | static STACK_OF(X509_PURPOSE) *xptable = NULL; |
673b102c | 116 | |
0f113f3e | 117 | static int xp_cmp(const X509_PURPOSE *const *a, const X509_PURPOSE *const *b) |
673b102c | 118 | { |
0f113f3e | 119 | return (*a)->purpose - (*b)->purpose; |
673b102c DSH |
120 | } |
121 | ||
0f113f3e MC |
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 | */ | |
673b102c DSH |
127 | int X509_check_purpose(X509 *x, int id, int ca) |
128 | { | |
0f113f3e MC |
129 | int idx; |
130 | const X509_PURPOSE *pt; | |
131 | if (!(x->ex_flags & EXFLAG_SET)) { | |
132 | CRYPTO_w_lock(CRYPTO_LOCK_X509); | |
133 | x509v3_cache_extensions(x); | |
134 | CRYPTO_w_unlock(CRYPTO_LOCK_X509); | |
135 | } | |
136 | if (id == -1) | |
137 | return 1; | |
138 | idx = X509_PURPOSE_get_by_id(id); | |
139 | if (idx == -1) | |
140 | return -1; | |
141 | pt = X509_PURPOSE_get0(idx); | |
142 | return pt->check_purpose(pt, x, ca); | |
673b102c | 143 | } |
e947f396 | 144 | |
926a56bf DSH |
145 | int X509_PURPOSE_set(int *p, int purpose) |
146 | { | |
0f113f3e MC |
147 | if (X509_PURPOSE_get_by_id(purpose) == -1) { |
148 | X509V3err(X509V3_F_X509_PURPOSE_SET, X509V3_R_INVALID_PURPOSE); | |
149 | return 0; | |
150 | } | |
151 | *p = purpose; | |
152 | return 1; | |
926a56bf DSH |
153 | } |
154 | ||
d4cec6a1 DSH |
155 | int X509_PURPOSE_get_count(void) |
156 | { | |
0f113f3e MC |
157 | if (!xptable) |
158 | return X509_PURPOSE_COUNT; | |
159 | return sk_X509_PURPOSE_num(xptable) + X509_PURPOSE_COUNT; | |
d4cec6a1 | 160 | } |
ce1b4fe1 | 161 | |
0f113f3e | 162 | X509_PURPOSE *X509_PURPOSE_get0(int idx) |
d4cec6a1 | 163 | { |
0f113f3e MC |
164 | if (idx < 0) |
165 | return NULL; | |
166 | if (idx < (int)X509_PURPOSE_COUNT) | |
167 | return xstandard + idx; | |
168 | return sk_X509_PURPOSE_value(xptable, idx - X509_PURPOSE_COUNT); | |
d4cec6a1 DSH |
169 | } |
170 | ||
171 | int X509_PURPOSE_get_by_sname(char *sname) | |
172 | { | |
0f113f3e MC |
173 | int i; |
174 | X509_PURPOSE *xptmp; | |
175 | for (i = 0; i < X509_PURPOSE_get_count(); i++) { | |
176 | xptmp = X509_PURPOSE_get0(i); | |
86885c28 | 177 | if (strcmp(xptmp->sname, sname) == 0) |
0f113f3e MC |
178 | return i; |
179 | } | |
180 | return -1; | |
d4cec6a1 | 181 | } |
673b102c | 182 | |
13938ace | 183 | int X509_PURPOSE_get_by_id(int purpose) |
673b102c | 184 | { |
0f113f3e MC |
185 | X509_PURPOSE tmp; |
186 | int idx; | |
187 | if ((purpose >= X509_PURPOSE_MIN) && (purpose <= X509_PURPOSE_MAX)) | |
188 | return purpose - X509_PURPOSE_MIN; | |
189 | tmp.purpose = purpose; | |
190 | if (!xptable) | |
191 | return -1; | |
192 | idx = sk_X509_PURPOSE_find(xptable, &tmp); | |
193 | if (idx == -1) | |
194 | return -1; | |
195 | return idx + X509_PURPOSE_COUNT; | |
673b102c DSH |
196 | } |
197 | ||
dd413410 | 198 | int X509_PURPOSE_add(int id, int trust, int flags, |
0f113f3e MC |
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 | flags &= ~X509_PURPOSE_DYNAMIC; | |
208 | /* This will always be set for application modified trust entries */ | |
209 | flags |= X509_PURPOSE_DYNAMIC_NAME; | |
210 | /* Get existing entry if any */ | |
211 | idx = X509_PURPOSE_get_by_id(id); | |
212 | /* Need a new entry */ | |
213 | if (idx == -1) { | |
75ebbd9a | 214 | if ((ptmp = OPENSSL_malloc(sizeof(*ptmp))) == NULL) { |
0f113f3e MC |
215 | X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE); |
216 | return 0; | |
217 | } | |
218 | ptmp->flags = X509_PURPOSE_DYNAMIC; | |
219 | } else | |
220 | ptmp = X509_PURPOSE_get0(idx); | |
221 | ||
222 | /* OPENSSL_free existing name if dynamic */ | |
223 | if (ptmp->flags & X509_PURPOSE_DYNAMIC_NAME) { | |
224 | OPENSSL_free(ptmp->name); | |
225 | OPENSSL_free(ptmp->sname); | |
226 | } | |
227 | /* dup supplied name */ | |
228 | ptmp->name = BUF_strdup(name); | |
229 | ptmp->sname = BUF_strdup(sname); | |
230 | if (!ptmp->name || !ptmp->sname) { | |
231 | X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE); | |
232 | return 0; | |
233 | } | |
234 | /* Keep the dynamic flag of existing entry */ | |
235 | ptmp->flags &= X509_PURPOSE_DYNAMIC; | |
236 | /* Set all other flags */ | |
237 | ptmp->flags |= flags; | |
238 | ||
239 | ptmp->purpose = id; | |
240 | ptmp->trust = trust; | |
241 | ptmp->check_purpose = ck; | |
242 | ptmp->usr_data = arg; | |
243 | ||
244 | /* If its a new entry manage the dynamic table */ | |
245 | if (idx == -1) { | |
75ebbd9a RS |
246 | if (xptable == NULL |
247 | && (xptable = sk_X509_PURPOSE_new(xp_cmp)) == NULL) { | |
0f113f3e MC |
248 | X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE); |
249 | return 0; | |
250 | } | |
251 | if (!sk_X509_PURPOSE_push(xptable, ptmp)) { | |
252 | X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE); | |
253 | return 0; | |
254 | } | |
255 | } | |
256 | return 1; | |
673b102c DSH |
257 | } |
258 | ||
79875776 | 259 | static void xptable_free(X509_PURPOSE *p) |
0f113f3e MC |
260 | { |
261 | if (!p) | |
262 | return; | |
263 | if (p->flags & X509_PURPOSE_DYNAMIC) { | |
264 | if (p->flags & X509_PURPOSE_DYNAMIC_NAME) { | |
265 | OPENSSL_free(p->name); | |
266 | OPENSSL_free(p->sname); | |
267 | } | |
268 | OPENSSL_free(p); | |
269 | } | |
270 | } | |
79875776 BM |
271 | |
272 | void X509_PURPOSE_cleanup(void) | |
273 | { | |
0f113f3e MC |
274 | unsigned int i; |
275 | sk_X509_PURPOSE_pop_free(xptable, xptable_free); | |
276 | for (i = 0; i < X509_PURPOSE_COUNT; i++) | |
277 | xptable_free(xstandard + i); | |
278 | xptable = NULL; | |
79875776 BM |
279 | } |
280 | ||
d4cec6a1 | 281 | int X509_PURPOSE_get_id(X509_PURPOSE *xp) |
673b102c | 282 | { |
0f113f3e | 283 | return xp->purpose; |
673b102c DSH |
284 | } |
285 | ||
c7cb16a8 | 286 | char *X509_PURPOSE_get0_name(X509_PURPOSE *xp) |
d4cec6a1 | 287 | { |
0f113f3e | 288 | return xp->name; |
d4cec6a1 | 289 | } |
673b102c | 290 | |
c7cb16a8 | 291 | char *X509_PURPOSE_get0_sname(X509_PURPOSE *xp) |
673b102c | 292 | { |
0f113f3e | 293 | return xp->sname; |
673b102c DSH |
294 | } |
295 | ||
d4cec6a1 | 296 | int X509_PURPOSE_get_trust(X509_PURPOSE *xp) |
673b102c | 297 | { |
0f113f3e | 298 | return xp->trust; |
673b102c DSH |
299 | } |
300 | ||
babb3798 | 301 | static int nid_cmp(const int *a, const int *b) |
0f113f3e MC |
302 | { |
303 | return *a - *b; | |
304 | } | |
f1558bb4 | 305 | |
e19106f5 DSH |
306 | DECLARE_OBJ_BSEARCH_CMP_FN(int, int, nid); |
307 | IMPLEMENT_OBJ_BSEARCH_CMP_FN(int, int, nid); | |
babb3798 | 308 | |
f1558bb4 | 309 | int X509_supported_extension(X509_EXTENSION *ex) |
0f113f3e MC |
310 | { |
311 | /* | |
312 | * This table is a list of the NIDs of supported extensions: that is | |
313 | * those which are used by the verify process. If an extension is | |
314 | * critical and doesn't appear in this list then the verify process will | |
315 | * normally reject the certificate. The list must be kept in numerical | |
316 | * order because it will be searched using bsearch. | |
317 | */ | |
318 | ||
319 | static const int supported_nids[] = { | |
320 | NID_netscape_cert_type, /* 71 */ | |
321 | NID_key_usage, /* 83 */ | |
322 | NID_subject_alt_name, /* 85 */ | |
323 | NID_basic_constraints, /* 87 */ | |
324 | NID_certificate_policies, /* 89 */ | |
325 | NID_ext_key_usage, /* 126 */ | |
47bbaa5b | 326 | #ifndef OPENSSL_NO_RFC3779 |
0f113f3e MC |
327 | NID_sbgp_ipAddrBlock, /* 290 */ |
328 | NID_sbgp_autonomousSysNum, /* 291 */ | |
47bbaa5b | 329 | #endif |
0f113f3e MC |
330 | NID_policy_constraints, /* 401 */ |
331 | NID_proxyCertInfo, /* 663 */ | |
332 | NID_name_constraints, /* 666 */ | |
333 | NID_policy_mappings, /* 747 */ | |
334 | NID_inhibit_any_policy /* 748 */ | |
335 | }; | |
336 | ||
337 | int ex_nid = OBJ_obj2nid(X509_EXTENSION_get_object(ex)); | |
338 | ||
339 | if (ex_nid == NID_undef) | |
340 | return 0; | |
341 | ||
b6eb9827 | 342 | if (OBJ_bsearch_nid(&ex_nid, supported_nids, OSSL_NELEM(supported_nids))) |
0f113f3e MC |
343 | return 1; |
344 | return 0; | |
345 | } | |
3e727a3b DSH |
346 | |
347 | static void setup_dp(X509 *x, DIST_POINT *dp) | |
0f113f3e MC |
348 | { |
349 | X509_NAME *iname = NULL; | |
350 | int i; | |
351 | if (dp->reasons) { | |
352 | if (dp->reasons->length > 0) | |
353 | dp->dp_reasons = dp->reasons->data[0]; | |
354 | if (dp->reasons->length > 1) | |
355 | dp->dp_reasons |= (dp->reasons->data[1] << 8); | |
356 | dp->dp_reasons &= CRLDP_ALL_REASONS; | |
357 | } else | |
358 | dp->dp_reasons = CRLDP_ALL_REASONS; | |
359 | if (!dp->distpoint || (dp->distpoint->type != 1)) | |
360 | return; | |
361 | for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++) { | |
362 | GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i); | |
363 | if (gen->type == GEN_DIRNAME) { | |
364 | iname = gen->d.directoryName; | |
365 | break; | |
366 | } | |
367 | } | |
368 | if (!iname) | |
369 | iname = X509_get_issuer_name(x); | |
370 | ||
371 | DIST_POINT_set_dpname(dp->distpoint, iname); | |
372 | ||
373 | } | |
3e727a3b DSH |
374 | |
375 | static void setup_crldp(X509 *x) | |
0f113f3e MC |
376 | { |
377 | int i; | |
378 | x->crldp = X509_get_ext_d2i(x, NID_crl_distribution_points, NULL, NULL); | |
379 | for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++) | |
380 | setup_dp(x, sk_DIST_POINT_value(x->crldp, i)); | |
381 | } | |
f1558bb4 | 382 | |
ce1b4fe1 | 383 | static void x509v3_cache_extensions(X509 *x) |
673b102c | 384 | { |
0f113f3e MC |
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 | if (x->ex_flags & EXFLAG_SET) | |
394 | return; | |
0f113f3e | 395 | X509_digest(x, EVP_sha1(), x->sha1_hash, NULL); |
0f113f3e MC |
396 | /* V1 should mean no extensions ... */ |
397 | if (!X509_get_version(x)) | |
398 | x->ex_flags |= EXFLAG_V1; | |
399 | /* Handle basic constraints */ | |
400 | if ((bs = X509_get_ext_d2i(x, NID_basic_constraints, NULL, NULL))) { | |
401 | if (bs->ca) | |
402 | x->ex_flags |= EXFLAG_CA; | |
403 | if (bs->pathlen) { | |
404 | if ((bs->pathlen->type == V_ASN1_NEG_INTEGER) | |
405 | || !bs->ca) { | |
406 | x->ex_flags |= EXFLAG_INVALID; | |
407 | x->ex_pathlen = 0; | |
408 | } else | |
409 | x->ex_pathlen = ASN1_INTEGER_get(bs->pathlen); | |
410 | } else | |
411 | x->ex_pathlen = -1; | |
412 | BASIC_CONSTRAINTS_free(bs); | |
413 | x->ex_flags |= EXFLAG_BCONS; | |
414 | } | |
415 | /* Handle proxy certificates */ | |
416 | if ((pci = X509_get_ext_d2i(x, NID_proxyCertInfo, NULL, NULL))) { | |
417 | if (x->ex_flags & EXFLAG_CA | |
418 | || X509_get_ext_by_NID(x, NID_subject_alt_name, -1) >= 0 | |
419 | || X509_get_ext_by_NID(x, NID_issuer_alt_name, -1) >= 0) { | |
420 | x->ex_flags |= EXFLAG_INVALID; | |
421 | } | |
422 | if (pci->pcPathLengthConstraint) { | |
423 | x->ex_pcpathlen = ASN1_INTEGER_get(pci->pcPathLengthConstraint); | |
424 | } else | |
425 | x->ex_pcpathlen = -1; | |
426 | PROXY_CERT_INFO_EXTENSION_free(pci); | |
427 | x->ex_flags |= EXFLAG_PROXY; | |
428 | } | |
429 | /* Handle key usage */ | |
430 | if ((usage = X509_get_ext_d2i(x, NID_key_usage, NULL, NULL))) { | |
431 | if (usage->length > 0) { | |
432 | x->ex_kusage = usage->data[0]; | |
433 | if (usage->length > 1) | |
434 | x->ex_kusage |= usage->data[1] << 8; | |
435 | } else | |
436 | x->ex_kusage = 0; | |
437 | x->ex_flags |= EXFLAG_KUSAGE; | |
438 | ASN1_BIT_STRING_free(usage); | |
439 | } | |
440 | x->ex_xkusage = 0; | |
441 | if ((extusage = X509_get_ext_d2i(x, NID_ext_key_usage, NULL, NULL))) { | |
442 | x->ex_flags |= EXFLAG_XKUSAGE; | |
443 | for (i = 0; i < sk_ASN1_OBJECT_num(extusage); i++) { | |
444 | switch (OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage, i))) { | |
445 | case NID_server_auth: | |
446 | x->ex_xkusage |= XKU_SSL_SERVER; | |
447 | break; | |
448 | ||
449 | case NID_client_auth: | |
450 | x->ex_xkusage |= XKU_SSL_CLIENT; | |
451 | break; | |
452 | ||
453 | case NID_email_protect: | |
454 | x->ex_xkusage |= XKU_SMIME; | |
455 | break; | |
456 | ||
457 | case NID_code_sign: | |
458 | x->ex_xkusage |= XKU_CODE_SIGN; | |
459 | break; | |
460 | ||
461 | case NID_ms_sgc: | |
462 | case NID_ns_sgc: | |
463 | x->ex_xkusage |= XKU_SGC; | |
464 | break; | |
465 | ||
466 | case NID_OCSP_sign: | |
467 | x->ex_xkusage |= XKU_OCSP_SIGN; | |
468 | break; | |
469 | ||
470 | case NID_time_stamp: | |
471 | x->ex_xkusage |= XKU_TIMESTAMP; | |
472 | break; | |
473 | ||
474 | case NID_dvcs: | |
475 | x->ex_xkusage |= XKU_DVCS; | |
476 | break; | |
477 | ||
478 | case NID_anyExtendedKeyUsage: | |
479 | x->ex_xkusage |= XKU_ANYEKU; | |
480 | break; | |
481 | } | |
482 | } | |
483 | sk_ASN1_OBJECT_pop_free(extusage, ASN1_OBJECT_free); | |
484 | } | |
485 | ||
486 | if ((ns = X509_get_ext_d2i(x, NID_netscape_cert_type, NULL, NULL))) { | |
487 | if (ns->length > 0) | |
488 | x->ex_nscert = ns->data[0]; | |
489 | else | |
490 | x->ex_nscert = 0; | |
491 | x->ex_flags |= EXFLAG_NSCERT; | |
492 | ASN1_BIT_STRING_free(ns); | |
493 | } | |
494 | x->skid = X509_get_ext_d2i(x, NID_subject_key_identifier, NULL, NULL); | |
495 | x->akid = X509_get_ext_d2i(x, NID_authority_key_identifier, NULL, NULL); | |
496 | /* Does subject name match issuer ? */ | |
497 | if (!X509_NAME_cmp(X509_get_subject_name(x), X509_get_issuer_name(x))) { | |
498 | x->ex_flags |= EXFLAG_SI; | |
499 | /* If SKID matches AKID also indicate self signed */ | |
500 | if (X509_check_akid(x, x->akid) == X509_V_OK) | |
501 | x->ex_flags |= EXFLAG_SS; | |
502 | } | |
503 | x->altname = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL); | |
504 | x->nc = X509_get_ext_d2i(x, NID_name_constraints, &i, NULL); | |
505 | if (!x->nc && (i != -1)) | |
506 | x->ex_flags |= EXFLAG_INVALID; | |
507 | setup_crldp(x); | |
d43c4497 | 508 | |
47bbaa5b | 509 | #ifndef OPENSSL_NO_RFC3779 |
0f113f3e MC |
510 | x->rfc3779_addr = X509_get_ext_d2i(x, NID_sbgp_ipAddrBlock, NULL, NULL); |
511 | x->rfc3779_asid = X509_get_ext_d2i(x, NID_sbgp_autonomousSysNum, | |
512 | NULL, NULL); | |
47bbaa5b | 513 | #endif |
0f113f3e MC |
514 | for (i = 0; i < X509_get_ext_count(x); i++) { |
515 | ex = X509_get_ext(x, i); | |
516 | if (OBJ_obj2nid(X509_EXTENSION_get_object(ex)) | |
517 | == NID_freshest_crl) | |
518 | x->ex_flags |= EXFLAG_FRESHEST; | |
519 | if (!X509_EXTENSION_get_critical(ex)) | |
520 | continue; | |
521 | if (!X509_supported_extension(ex)) { | |
522 | x->ex_flags |= EXFLAG_CRITICAL; | |
523 | break; | |
524 | } | |
525 | } | |
526 | x->ex_flags |= EXFLAG_SET; | |
673b102c DSH |
527 | } |
528 | ||
1d97c843 TH |
529 | /*- |
530 | * CA checks common to all purposes | |
673b102c DSH |
531 | * return codes: |
532 | * 0 not a CA | |
533 | * 1 is a CA | |
534 | * 2 basicConstraints absent so "maybe" a CA | |
535 | * 3 basicConstraints absent but self signed V1. | |
bc501570 | 536 | * 4 basicConstraints absent but keyUsage present and keyCertSign asserted. |
673b102c DSH |
537 | */ |
538 | ||
539 | #define V1_ROOT (EXFLAG_V1|EXFLAG_SS) | |
540 | #define ku_reject(x, usage) \ | |
0f113f3e | 541 | (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage))) |
673b102c | 542 | #define xku_reject(x, usage) \ |
0f113f3e | 543 | (((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage))) |
673b102c | 544 | #define ns_reject(x, usage) \ |
0f113f3e | 545 | (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage))) |
673b102c | 546 | |
5073ff03 | 547 | static int check_ca(const X509 *x) |
673b102c | 548 | { |
0f113f3e MC |
549 | /* keyUsage if present should allow cert signing */ |
550 | if (ku_reject(x, KU_KEY_CERT_SIGN)) | |
551 | return 0; | |
552 | if (x->ex_flags & EXFLAG_BCONS) { | |
553 | if (x->ex_flags & EXFLAG_CA) | |
554 | return 1; | |
555 | /* If basicConstraints says not a CA then say so */ | |
556 | else | |
557 | return 0; | |
558 | } else { | |
559 | /* we support V1 roots for... uh, I don't really know why. */ | |
560 | if ((x->ex_flags & V1_ROOT) == V1_ROOT) | |
561 | return 3; | |
562 | /* | |
563 | * If key usage present it must have certSign so tolerate it | |
564 | */ | |
565 | else if (x->ex_flags & EXFLAG_KUSAGE) | |
566 | return 4; | |
567 | /* Older certificates could have Netscape-specific CA types */ | |
568 | else if (x->ex_flags & EXFLAG_NSCERT && x->ex_nscert & NS_ANY_CA) | |
569 | return 5; | |
570 | /* can this still be regarded a CA certificate? I doubt it */ | |
571 | return 0; | |
572 | } | |
673b102c DSH |
573 | } |
574 | ||
5073ff03 RL |
575 | int X509_check_ca(X509 *x) |
576 | { | |
0f113f3e MC |
577 | if (!(x->ex_flags & EXFLAG_SET)) { |
578 | CRYPTO_w_lock(CRYPTO_LOCK_X509); | |
579 | x509v3_cache_extensions(x); | |
580 | CRYPTO_w_unlock(CRYPTO_LOCK_X509); | |
581 | } | |
5073ff03 | 582 | |
0f113f3e | 583 | return check_ca(x); |
5073ff03 RL |
584 | } |
585 | ||
0cb957a6 | 586 | /* Check SSL CA: common checks for SSL client and server */ |
ccd86b68 | 587 | static int check_ssl_ca(const X509 *x) |
0cb957a6 | 588 | { |
0f113f3e MC |
589 | int ca_ret; |
590 | ca_ret = check_ca(x); | |
591 | if (!ca_ret) | |
592 | return 0; | |
593 | /* check nsCertType if present */ | |
594 | if (ca_ret != 5 || x->ex_nscert & NS_SSL_CA) | |
595 | return ca_ret; | |
596 | else | |
597 | return 0; | |
0cb957a6 | 598 | } |
8cff6331 | 599 | |
0f113f3e MC |
600 | static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x, |
601 | int ca) | |
673b102c | 602 | { |
0f113f3e MC |
603 | if (xku_reject(x, XKU_SSL_CLIENT)) |
604 | return 0; | |
605 | if (ca) | |
606 | return check_ssl_ca(x); | |
607 | /* We need to do digital signatures or key agreement */ | |
608 | if (ku_reject(x, KU_DIGITAL_SIGNATURE | KU_KEY_AGREEMENT)) | |
609 | return 0; | |
610 | /* nsCertType if present should allow SSL client use */ | |
611 | if (ns_reject(x, NS_SSL_CLIENT)) | |
612 | return 0; | |
613 | return 1; | |
673b102c | 614 | } |
0f113f3e MC |
615 | |
616 | /* | |
617 | * Key usage needed for TLS/SSL server: digital signature, encipherment or | |
7568d15a DSH |
618 | * key agreement. The ssl code can check this more thoroughly for individual |
619 | * key types. | |
620 | */ | |
621 | #define KU_TLS \ | |
0f113f3e | 622 | KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT|KU_KEY_AGREEMENT |
673b102c | 623 | |
0f113f3e MC |
624 | static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x, |
625 | int ca) | |
673b102c | 626 | { |
0f113f3e MC |
627 | if (xku_reject(x, XKU_SSL_SERVER | XKU_SGC)) |
628 | return 0; | |
629 | if (ca) | |
630 | return check_ssl_ca(x); | |
631 | ||
632 | if (ns_reject(x, NS_SSL_SERVER)) | |
633 | return 0; | |
634 | if (ku_reject(x, KU_TLS)) | |
635 | return 0; | |
673b102c | 636 | |
0f113f3e | 637 | return 1; |
673b102c DSH |
638 | |
639 | } | |
640 | ||
0f113f3e MC |
641 | static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x, |
642 | int ca) | |
673b102c | 643 | { |
0f113f3e MC |
644 | int ret; |
645 | ret = check_purpose_ssl_server(xp, x, ca); | |
646 | if (!ret || ca) | |
647 | return ret; | |
648 | /* We need to encipher or Netscape complains */ | |
649 | if (ku_reject(x, KU_KEY_ENCIPHERMENT)) | |
650 | return 0; | |
651 | return ret; | |
673b102c DSH |
652 | } |
653 | ||
654 | /* common S/MIME checks */ | |
ccd86b68 | 655 | static int purpose_smime(const X509 *x, int ca) |
673b102c | 656 | { |
0f113f3e MC |
657 | if (xku_reject(x, XKU_SMIME)) |
658 | return 0; | |
659 | if (ca) { | |
660 | int ca_ret; | |
661 | ca_ret = check_ca(x); | |
662 | if (!ca_ret) | |
663 | return 0; | |
664 | /* check nsCertType if present */ | |
665 | if (ca_ret != 5 || x->ex_nscert & NS_SMIME_CA) | |
666 | return ca_ret; | |
667 | else | |
668 | return 0; | |
669 | } | |
670 | if (x->ex_flags & EXFLAG_NSCERT) { | |
671 | if (x->ex_nscert & NS_SMIME) | |
672 | return 1; | |
673 | /* Workaround for some buggy certificates */ | |
674 | if (x->ex_nscert & NS_SSL_CLIENT) | |
675 | return 2; | |
676 | return 0; | |
677 | } | |
678 | return 1; | |
673b102c DSH |
679 | } |
680 | ||
0f113f3e MC |
681 | static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x, |
682 | int ca) | |
673b102c | 683 | { |
0f113f3e MC |
684 | int ret; |
685 | ret = purpose_smime(x, ca); | |
686 | if (!ret || ca) | |
687 | return ret; | |
688 | if (ku_reject(x, KU_DIGITAL_SIGNATURE | KU_NON_REPUDIATION)) | |
689 | return 0; | |
690 | return ret; | |
673b102c DSH |
691 | } |
692 | ||
0f113f3e MC |
693 | static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x, |
694 | int ca) | |
673b102c | 695 | { |
0f113f3e MC |
696 | int ret; |
697 | ret = purpose_smime(x, ca); | |
698 | if (!ret || ca) | |
699 | return ret; | |
700 | if (ku_reject(x, KU_KEY_ENCIPHERMENT)) | |
701 | return 0; | |
702 | return ret; | |
673b102c DSH |
703 | } |
704 | ||
0f113f3e MC |
705 | static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x, |
706 | int ca) | |
673b102c | 707 | { |
0f113f3e MC |
708 | if (ca) { |
709 | int ca_ret; | |
710 | if ((ca_ret = check_ca(x)) != 2) | |
711 | return ca_ret; | |
712 | else | |
713 | return 0; | |
714 | } | |
715 | if (ku_reject(x, KU_CRL_SIGN)) | |
716 | return 0; | |
717 | return 1; | |
673b102c | 718 | } |
068fdce8 | 719 | |
0f113f3e MC |
720 | /* |
721 | * OCSP helper: this is *not* a full OCSP check. It just checks that each CA | |
722 | * is valid. Additional checks must be made on the chain. | |
81f169e9 DSH |
723 | */ |
724 | ||
725 | static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca) | |
726 | { | |
0f113f3e MC |
727 | /* |
728 | * Must be a valid CA. Should we really support the "I don't know" value | |
729 | * (2)? | |
730 | */ | |
731 | if (ca) | |
732 | return check_ca(x); | |
733 | /* leaf certificate is checked in OCSP_verify() */ | |
734 | return 1; | |
81f169e9 DSH |
735 | } |
736 | ||
c7235be6 | 737 | static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x, |
0f113f3e | 738 | int ca) |
c7235be6 | 739 | { |
0f113f3e MC |
740 | int i_ext; |
741 | ||
742 | /* If ca is true we must return if this is a valid CA certificate. */ | |
743 | if (ca) | |
744 | return check_ca(x); | |
745 | ||
746 | /* | |
747 | * Check the optional key usage field: | |
748 | * if Key Usage is present, it must be one of digitalSignature | |
749 | * and/or nonRepudiation (other values are not consistent and shall | |
750 | * be rejected). | |
751 | */ | |
752 | if ((x->ex_flags & EXFLAG_KUSAGE) | |
753 | && ((x->ex_kusage & ~(KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE)) || | |
754 | !(x->ex_kusage & (KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE)))) | |
755 | return 0; | |
756 | ||
757 | /* Only time stamp key usage is permitted and it's required. */ | |
758 | if (!(x->ex_flags & EXFLAG_XKUSAGE) || x->ex_xkusage != XKU_TIMESTAMP) | |
759 | return 0; | |
760 | ||
761 | /* Extended Key Usage MUST be critical */ | |
762 | i_ext = X509_get_ext_by_NID((X509 *)x, NID_ext_key_usage, -1); | |
763 | if (i_ext >= 0) { | |
764 | X509_EXTENSION *ext = X509_get_ext((X509 *)x, i_ext); | |
765 | if (!X509_EXTENSION_get_critical(ext)) | |
766 | return 0; | |
767 | } | |
768 | ||
769 | return 1; | |
c7235be6 UM |
770 | } |
771 | ||
ccd86b68 | 772 | static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca) |
068fdce8 | 773 | { |
0f113f3e | 774 | return 1; |
068fdce8 | 775 | } |
2f043896 | 776 | |
1d97c843 TH |
777 | /*- |
778 | * Various checks to see if one certificate issued the second. | |
2f043896 DSH |
779 | * This can be used to prune a set of possible issuer certificates |
780 | * which have been looked up using some simple method such as by | |
781 | * subject name. | |
782 | * These are: | |
783 | * 1. Check issuer_name(subject) == subject_name(issuer) | |
784 | * 2. If akid(subject) exists check it matches issuer | |
785 | * 3. If key_usage(issuer) exists check it supports certificate signing | |
786 | * returns 0 for OK, positive for reason for mismatch, reasons match | |
787 | * codes for X509_verify_cert() | |
788 | */ | |
789 | ||
790 | int X509_check_issued(X509 *issuer, X509 *subject) | |
791 | { | |
0f113f3e MC |
792 | if (X509_NAME_cmp(X509_get_subject_name(issuer), |
793 | X509_get_issuer_name(subject))) | |
794 | return X509_V_ERR_SUBJECT_ISSUER_MISMATCH; | |
795 | x509v3_cache_extensions(issuer); | |
796 | x509v3_cache_extensions(subject); | |
797 | ||
798 | if (subject->akid) { | |
799 | int ret = X509_check_akid(issuer, subject->akid); | |
800 | if (ret != X509_V_OK) | |
801 | return ret; | |
802 | } | |
803 | ||
804 | if (subject->ex_flags & EXFLAG_PROXY) { | |
805 | if (ku_reject(issuer, KU_DIGITAL_SIGNATURE)) | |
806 | return X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE; | |
807 | } else if (ku_reject(issuer, KU_KEY_CERT_SIGN)) | |
808 | return X509_V_ERR_KEYUSAGE_NO_CERTSIGN; | |
809 | return X509_V_OK; | |
2f043896 DSH |
810 | } |
811 | ||
bc7535bc | 812 | int X509_check_akid(X509 *issuer, AUTHORITY_KEYID *akid) |
0f113f3e | 813 | { |
bc7535bc | 814 | |
0f113f3e MC |
815 | if (!akid) |
816 | return X509_V_OK; | |
817 | ||
818 | /* Check key ids (if present) */ | |
819 | if (akid->keyid && issuer->skid && | |
820 | ASN1_OCTET_STRING_cmp(akid->keyid, issuer->skid)) | |
821 | return X509_V_ERR_AKID_SKID_MISMATCH; | |
822 | /* Check serial number */ | |
823 | if (akid->serial && | |
824 | ASN1_INTEGER_cmp(X509_get_serialNumber(issuer), akid->serial)) | |
825 | return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH; | |
826 | /* Check issuer name */ | |
827 | if (akid->issuer) { | |
828 | /* | |
829 | * Ugh, for some peculiar reason AKID includes SEQUENCE OF | |
830 | * GeneralName. So look for a DirName. There may be more than one but | |
831 | * we only take any notice of the first. | |
832 | */ | |
833 | GENERAL_NAMES *gens; | |
834 | GENERAL_NAME *gen; | |
835 | X509_NAME *nm = NULL; | |
836 | int i; | |
837 | gens = akid->issuer; | |
838 | for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) { | |
839 | gen = sk_GENERAL_NAME_value(gens, i); | |
840 | if (gen->type == GEN_DIRNAME) { | |
841 | nm = gen->d.dirn; | |
842 | break; | |
843 | } | |
844 | } | |
845 | if (nm && X509_NAME_cmp(nm, X509_get_issuer_name(issuer))) | |
846 | return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH; | |
847 | } | |
848 | return X509_V_OK; | |
849 | } | |
063f1f0c DSH |
850 | |
851 | uint32_t X509_get_extension_flags(X509 *x) | |
852 | { | |
853 | X509_check_purpose(x, -1, -1); | |
854 | return x->ex_flags; | |
855 | } | |
856 | ||
857 | uint32_t X509_get_key_usage(X509 *x) | |
858 | { | |
859 | X509_check_purpose(x, -1, -1); | |
860 | if (x->ex_flags & EXFLAG_KUSAGE) | |
861 | return x->ex_kusage; | |
862 | return UINT32_MAX; | |
863 | } | |
864 | ||
865 | uint32_t X509_get_extended_key_usage(X509 *x) | |
866 | { | |
867 | X509_check_purpose(x, -1, -1); | |
868 | if (x->ex_flags & EXFLAG_XKUSAGE) | |
869 | return x->ex_xkusage; | |
870 | return UINT32_MAX; | |
871 | } | |
d19a50c9 DSH |
872 | |
873 | const ASN1_OCTET_STRING *X509_get0_subject_key_id(X509 *x) | |
874 | { | |
875 | X509_check_purpose(x, -1, -1); | |
876 | return x->skid; | |
877 | } |