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673b102c DSH |
1 | /* v3_purp.c */ |
2 | /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL | |
f1558bb4 | 3 | * project 2001. |
673b102c DSH |
4 | */ |
5 | /* ==================================================================== | |
bc501570 | 6 | * Copyright (c) 1999-2004 The OpenSSL Project. All rights reserved. |
673b102c DSH |
7 | * |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in | |
17 | * the documentation and/or other materials provided with the | |
18 | * distribution. | |
19 | * | |
20 | * 3. All advertising materials mentioning features or use of this | |
21 | * software must display the following acknowledgment: | |
22 | * "This product includes software developed by the OpenSSL Project | |
23 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
24 | * | |
25 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
26 | * endorse or promote products derived from this software without | |
27 | * prior written permission. For written permission, please contact | |
28 | * licensing@OpenSSL.org. | |
29 | * | |
30 | * 5. Products derived from this software may not be called "OpenSSL" | |
31 | * nor may "OpenSSL" appear in their names without prior written | |
32 | * permission of the OpenSSL Project. | |
33 | * | |
34 | * 6. Redistributions of any form whatsoever must retain the following | |
35 | * acknowledgment: | |
36 | * "This product includes software developed by the OpenSSL Project | |
37 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
38 | * | |
39 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
40 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
42 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
43 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
48 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
49 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
50 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
51 | * ==================================================================== | |
52 | * | |
53 | * This product includes cryptographic software written by Eric Young | |
54 | * (eay@cryptsoft.com). This product includes software written by Tim | |
55 | * Hudson (tjh@cryptsoft.com). | |
56 | * | |
57 | */ | |
58 | ||
59 | #include <stdio.h> | |
60 | #include "cryptlib.h" | |
61 | #include <openssl/x509v3.h> | |
2f043896 | 62 | #include <openssl/x509_vfy.h> |
673b102c | 63 | |
ce1b4fe1 | 64 | static void x509v3_cache_extensions(X509 *x); |
673b102c | 65 | |
ccd86b68 GT |
66 | static int check_ssl_ca(const X509 *x); |
67 | static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x, int ca); | |
68 | static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x, int ca); | |
69 | static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x, int ca); | |
70 | static int purpose_smime(const X509 *x, int ca); | |
71 | static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x, int ca); | |
72 | static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x, int ca); | |
73 | static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x, int ca); | |
c7235be6 | 74 | static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x, int ca); |
ccd86b68 | 75 | static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca); |
81f169e9 | 76 | static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca); |
ccd86b68 GT |
77 | |
78 | static int xp_cmp(const X509_PURPOSE * const *a, | |
79 | const X509_PURPOSE * const *b); | |
d4cec6a1 | 80 | static void xptable_free(X509_PURPOSE *p); |
673b102c DSH |
81 | |
82 | static X509_PURPOSE xstandard[] = { | |
d4cec6a1 DSH |
83 | {X509_PURPOSE_SSL_CLIENT, X509_TRUST_SSL_CLIENT, 0, check_purpose_ssl_client, "SSL client", "sslclient", NULL}, |
84 | {X509_PURPOSE_SSL_SERVER, X509_TRUST_SSL_SERVER, 0, check_purpose_ssl_server, "SSL server", "sslserver", NULL}, | |
85 | {X509_PURPOSE_NS_SSL_SERVER, X509_TRUST_SSL_SERVER, 0, check_purpose_ns_ssl_server, "Netscape SSL server", "nssslserver", NULL}, | |
86 | {X509_PURPOSE_SMIME_SIGN, X509_TRUST_EMAIL, 0, check_purpose_smime_sign, "S/MIME signing", "smimesign", NULL}, | |
87 | {X509_PURPOSE_SMIME_ENCRYPT, X509_TRUST_EMAIL, 0, check_purpose_smime_encrypt, "S/MIME encryption", "smimeencrypt", NULL}, | |
068fdce8 DSH |
88 | {X509_PURPOSE_CRL_SIGN, X509_TRUST_COMPAT, 0, check_purpose_crl_sign, "CRL signing", "crlsign", NULL}, |
89 | {X509_PURPOSE_ANY, X509_TRUST_DEFAULT, 0, no_check, "Any Purpose", "any", NULL}, | |
81f169e9 | 90 | {X509_PURPOSE_OCSP_HELPER, X509_TRUST_COMPAT, 0, ocsp_helper, "OCSP helper", "ocsphelper", NULL}, |
c7235be6 | 91 | {X509_PURPOSE_TIMESTAMP_SIGN, X509_TRUST_TSA, 0, check_purpose_timestamp_sign, "Time Stamp signing", "timestampsign", NULL}, |
673b102c DSH |
92 | }; |
93 | ||
dd413410 DSH |
94 | #define X509_PURPOSE_COUNT (sizeof(xstandard)/sizeof(X509_PURPOSE)) |
95 | ||
673b102c DSH |
96 | IMPLEMENT_STACK_OF(X509_PURPOSE) |
97 | ||
79875776 | 98 | static STACK_OF(X509_PURPOSE) *xptable = NULL; |
673b102c | 99 | |
ccd86b68 GT |
100 | static int xp_cmp(const X509_PURPOSE * const *a, |
101 | const X509_PURPOSE * const *b) | |
673b102c | 102 | { |
13938ace | 103 | return (*a)->purpose - (*b)->purpose; |
673b102c DSH |
104 | } |
105 | ||
ccd86b68 GT |
106 | /* As much as I'd like to make X509_check_purpose use a "const" X509* |
107 | * I really can't because it does recalculate hashes and do other non-const | |
108 | * things. */ | |
673b102c DSH |
109 | int X509_check_purpose(X509 *x, int id, int ca) |
110 | { | |
111 | int idx; | |
ccd86b68 | 112 | const X509_PURPOSE *pt; |
673b102c DSH |
113 | if(!(x->ex_flags & EXFLAG_SET)) { |
114 | CRYPTO_w_lock(CRYPTO_LOCK_X509); | |
115 | x509v3_cache_extensions(x); | |
116 | CRYPTO_w_unlock(CRYPTO_LOCK_X509); | |
117 | } | |
e947f396 | 118 | if(id == -1) return 1; |
d4cec6a1 | 119 | idx = X509_PURPOSE_get_by_id(id); |
673b102c | 120 | if(idx == -1) return -1; |
6d0d5431 | 121 | pt = X509_PURPOSE_get0(idx); |
dd413410 | 122 | return pt->check_purpose(pt, x, ca); |
673b102c | 123 | } |
e947f396 | 124 | |
926a56bf DSH |
125 | int X509_PURPOSE_set(int *p, int purpose) |
126 | { | |
127 | if(X509_PURPOSE_get_by_id(purpose) == -1) { | |
128 | X509V3err(X509V3_F_X509_PURPOSE_SET, X509V3_R_INVALID_PURPOSE); | |
129 | return 0; | |
130 | } | |
131 | *p = purpose; | |
132 | return 1; | |
133 | } | |
134 | ||
d4cec6a1 DSH |
135 | int X509_PURPOSE_get_count(void) |
136 | { | |
dd413410 DSH |
137 | if(!xptable) return X509_PURPOSE_COUNT; |
138 | return sk_X509_PURPOSE_num(xptable) + X509_PURPOSE_COUNT; | |
d4cec6a1 | 139 | } |
ce1b4fe1 | 140 | |
6d0d5431 | 141 | X509_PURPOSE * X509_PURPOSE_get0(int idx) |
d4cec6a1 | 142 | { |
dd413410 | 143 | if(idx < 0) return NULL; |
27545970 | 144 | if(idx < (int)X509_PURPOSE_COUNT) return xstandard + idx; |
dd413410 | 145 | return sk_X509_PURPOSE_value(xptable, idx - X509_PURPOSE_COUNT); |
d4cec6a1 DSH |
146 | } |
147 | ||
148 | int X509_PURPOSE_get_by_sname(char *sname) | |
149 | { | |
150 | int i; | |
151 | X509_PURPOSE *xptmp; | |
dd413410 | 152 | for(i = 0; i < X509_PURPOSE_get_count(); i++) { |
6d0d5431 | 153 | xptmp = X509_PURPOSE_get0(i); |
13938ace | 154 | if(!strcmp(xptmp->sname, sname)) return i; |
d4cec6a1 DSH |
155 | } |
156 | return -1; | |
157 | } | |
673b102c | 158 | |
13938ace | 159 | int X509_PURPOSE_get_by_id(int purpose) |
673b102c DSH |
160 | { |
161 | X509_PURPOSE tmp; | |
dd413410 DSH |
162 | int idx; |
163 | if((purpose >= X509_PURPOSE_MIN) && (purpose <= X509_PURPOSE_MAX)) | |
164 | return purpose - X509_PURPOSE_MIN; | |
13938ace | 165 | tmp.purpose = purpose; |
673b102c | 166 | if(!xptable) return -1; |
dd413410 DSH |
167 | idx = sk_X509_PURPOSE_find(xptable, &tmp); |
168 | if(idx == -1) return -1; | |
169 | return idx + X509_PURPOSE_COUNT; | |
673b102c DSH |
170 | } |
171 | ||
dd413410 | 172 | int X509_PURPOSE_add(int id, int trust, int flags, |
ccd86b68 | 173 | int (*ck)(const X509_PURPOSE *, const X509 *, int), |
dd413410 | 174 | char *name, char *sname, void *arg) |
673b102c DSH |
175 | { |
176 | int idx; | |
dd413410 DSH |
177 | X509_PURPOSE *ptmp; |
178 | /* This is set according to what we change: application can't set it */ | |
179 | flags &= ~X509_PURPOSE_DYNAMIC; | |
180 | /* This will always be set for application modified trust entries */ | |
181 | flags |= X509_PURPOSE_DYNAMIC_NAME; | |
182 | /* Get existing entry if any */ | |
183 | idx = X509_PURPOSE_get_by_id(id); | |
184 | /* Need a new entry */ | |
185 | if(idx == -1) { | |
26a3a48d | 186 | if(!(ptmp = OPENSSL_malloc(sizeof(X509_PURPOSE)))) { |
79875776 BM |
187 | X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE); |
188 | return 0; | |
79875776 | 189 | } |
dd413410 | 190 | ptmp->flags = X509_PURPOSE_DYNAMIC; |
6d0d5431 | 191 | } else ptmp = X509_PURPOSE_get0(idx); |
dd413410 | 192 | |
26a3a48d | 193 | /* OPENSSL_free existing name if dynamic */ |
dd413410 | 194 | if(ptmp->flags & X509_PURPOSE_DYNAMIC_NAME) { |
26a3a48d RL |
195 | OPENSSL_free(ptmp->name); |
196 | OPENSSL_free(ptmp->sname); | |
dd413410 DSH |
197 | } |
198 | /* dup supplied name */ | |
199 | ptmp->name = BUF_strdup(name); | |
200 | ptmp->sname = BUF_strdup(sname); | |
201 | if(!ptmp->name || !ptmp->sname) { | |
202 | X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE); | |
203 | return 0; | |
204 | } | |
205 | /* Keep the dynamic flag of existing entry */ | |
206 | ptmp->flags &= X509_PURPOSE_DYNAMIC; | |
207 | /* Set all other flags */ | |
208 | ptmp->flags |= flags; | |
209 | ||
210 | ptmp->purpose = id; | |
211 | ptmp->trust = trust; | |
212 | ptmp->check_purpose = ck; | |
213 | ptmp->usr_data = arg; | |
214 | ||
215 | /* If its a new entry manage the dynamic table */ | |
216 | if(idx == -1) { | |
217 | if(!xptable && !(xptable = sk_X509_PURPOSE_new(xp_cmp))) { | |
218 | X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE); | |
219 | return 0; | |
220 | } | |
221 | if (!sk_X509_PURPOSE_push(xptable, ptmp)) { | |
79875776 BM |
222 | X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE); |
223 | return 0; | |
d4cec6a1 DSH |
224 | } |
225 | } | |
673b102c DSH |
226 | return 1; |
227 | } | |
228 | ||
79875776 BM |
229 | static void xptable_free(X509_PURPOSE *p) |
230 | { | |
d4cec6a1 | 231 | if(!p) return; |
13938ace | 232 | if (p->flags & X509_PURPOSE_DYNAMIC) |
79875776 | 233 | { |
13938ace | 234 | if (p->flags & X509_PURPOSE_DYNAMIC_NAME) { |
26a3a48d RL |
235 | OPENSSL_free(p->name); |
236 | OPENSSL_free(p->sname); | |
d4cec6a1 | 237 | } |
26a3a48d | 238 | OPENSSL_free(p); |
79875776 BM |
239 | } |
240 | } | |
241 | ||
242 | void X509_PURPOSE_cleanup(void) | |
243 | { | |
27545970 | 244 | unsigned int i; |
79875776 | 245 | sk_X509_PURPOSE_pop_free(xptable, xptable_free); |
dd413410 | 246 | for(i = 0; i < X509_PURPOSE_COUNT; i++) xptable_free(xstandard + i); |
79875776 BM |
247 | xptable = NULL; |
248 | } | |
249 | ||
d4cec6a1 | 250 | int X509_PURPOSE_get_id(X509_PURPOSE *xp) |
673b102c | 251 | { |
13938ace | 252 | return xp->purpose; |
673b102c DSH |
253 | } |
254 | ||
c7cb16a8 | 255 | char *X509_PURPOSE_get0_name(X509_PURPOSE *xp) |
d4cec6a1 | 256 | { |
13938ace | 257 | return xp->name; |
d4cec6a1 | 258 | } |
673b102c | 259 | |
c7cb16a8 | 260 | char *X509_PURPOSE_get0_sname(X509_PURPOSE *xp) |
673b102c | 261 | { |
13938ace | 262 | return xp->sname; |
673b102c DSH |
263 | } |
264 | ||
d4cec6a1 | 265 | int X509_PURPOSE_get_trust(X509_PURPOSE *xp) |
673b102c | 266 | { |
13938ace | 267 | return xp->trust; |
673b102c DSH |
268 | } |
269 | ||
f1558bb4 DSH |
270 | static int nid_cmp(int *a, int *b) |
271 | { | |
272 | return *a - *b; | |
273 | } | |
274 | ||
275 | int X509_supported_extension(X509_EXTENSION *ex) | |
276 | { | |
277 | /* This table is a list of the NIDs of supported extensions: | |
278 | * that is those which are used by the verify process. If | |
279 | * an extension is critical and doesn't appear in this list | |
280 | * then the verify process will normally reject the certificate. | |
281 | * The list must be kept in numerical order because it will be | |
282 | * searched using bsearch. | |
283 | */ | |
284 | ||
285 | static int supported_nids[] = { | |
286 | NID_netscape_cert_type, /* 71 */ | |
287 | NID_key_usage, /* 83 */ | |
288 | NID_subject_alt_name, /* 85 */ | |
289 | NID_basic_constraints, /* 87 */ | |
96ea4ae9 | 290 | NID_certificate_policies, /* 89 */ |
6951c23a | 291 | NID_ext_key_usage, /* 126 */ |
10ca15f3 | 292 | #ifndef OPENSSL_NO_RFC3779 |
96ea4ae9 BL |
293 | NID_sbgp_ipAddrBlock, /* 290 */ |
294 | NID_sbgp_autonomousSysNum, /* 291 */ | |
295 | #endif | |
db50661f | 296 | NID_policy_constraints, /* 401 */ |
dcc0c298 | 297 | NID_proxyCertInfo, /* 663 */ |
e9746e03 | 298 | NID_name_constraints, /* 666 */ |
002e66c0 | 299 | NID_policy_mappings, /* 747 */ |
dcc0c298 | 300 | NID_inhibit_any_policy /* 748 */ |
f1558bb4 DSH |
301 | }; |
302 | ||
303 | int ex_nid; | |
304 | ||
305 | ex_nid = OBJ_obj2nid(X509_EXTENSION_get_object(ex)); | |
306 | ||
307 | if (ex_nid == NID_undef) | |
308 | return 0; | |
309 | ||
310 | if (OBJ_bsearch((char *)&ex_nid, (char *)supported_nids, | |
311 | sizeof(supported_nids)/sizeof(int), sizeof(int), | |
312 | (int (*)(const void *, const void *))nid_cmp)) | |
313 | return 1; | |
314 | return 0; | |
315 | } | |
3e727a3b DSH |
316 | |
317 | static void setup_dp(X509 *x, DIST_POINT *dp) | |
318 | { | |
319 | X509_NAME *iname = NULL; | |
320 | int i; | |
4b96839f DSH |
321 | if (dp->reasons) |
322 | { | |
323 | if (dp->reasons->length > 0) | |
324 | dp->dp_reasons = dp->reasons->data[0]; | |
325 | if (dp->reasons->length > 1) | |
326 | dp->dp_reasons |= (dp->reasons->data[1] << 8); | |
327 | dp->dp_reasons &= CRLDP_ALL_REASONS; | |
328 | } | |
329 | else | |
330 | dp->dp_reasons = CRLDP_ALL_REASONS; | |
3e727a3b DSH |
331 | if (!dp->distpoint || (dp->distpoint->type != 1)) |
332 | return; | |
333 | for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++) | |
334 | { | |
335 | GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i); | |
336 | if (gen->type == GEN_DIRNAME) | |
337 | { | |
338 | iname = gen->d.directoryName; | |
339 | break; | |
340 | } | |
341 | } | |
342 | if (!iname) | |
343 | iname = X509_get_issuer_name(x); | |
344 | ||
345 | DIST_POINT_set_dpname(dp->distpoint, iname); | |
346 | ||
347 | } | |
348 | ||
349 | static void setup_crldp(X509 *x) | |
350 | { | |
351 | int i; | |
352 | x->crldp = X509_get_ext_d2i(x, NID_crl_distribution_points, NULL, NULL); | |
353 | for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++) | |
354 | setup_dp(x, sk_DIST_POINT_value(x->crldp, i)); | |
355 | } | |
f1558bb4 | 356 | |
ce1b4fe1 | 357 | static void x509v3_cache_extensions(X509 *x) |
673b102c DSH |
358 | { |
359 | BASIC_CONSTRAINTS *bs; | |
6951c23a | 360 | PROXY_CERT_INFO_EXTENSION *pci; |
673b102c DSH |
361 | ASN1_BIT_STRING *usage; |
362 | ASN1_BIT_STRING *ns; | |
9d6b1ce6 | 363 | EXTENDED_KEY_USAGE *extusage; |
f1558bb4 | 364 | X509_EXTENSION *ex; |
2f043896 | 365 | |
673b102c DSH |
366 | int i; |
367 | if(x->ex_flags & EXFLAG_SET) return; | |
cf1b7d96 | 368 | #ifndef OPENSSL_NO_SHA |
e947f396 | 369 | X509_digest(x, EVP_sha1(), x->sha1_hash, NULL); |
2f043896 | 370 | #endif |
673b102c | 371 | /* Does subject name match issuer ? */ |
51630a37 | 372 | if(!X509_NAME_cmp(X509_get_subject_name(x), X509_get_issuer_name(x))) |
db50661f | 373 | x->ex_flags |= EXFLAG_SI; |
673b102c DSH |
374 | /* V1 should mean no extensions ... */ |
375 | if(!X509_get_version(x)) x->ex_flags |= EXFLAG_V1; | |
376 | /* Handle basic constraints */ | |
ff8a4c47 | 377 | if((bs=X509_get_ext_d2i(x, NID_basic_constraints, NULL, NULL))) { |
673b102c DSH |
378 | if(bs->ca) x->ex_flags |= EXFLAG_CA; |
379 | if(bs->pathlen) { | |
380 | if((bs->pathlen->type == V_ASN1_NEG_INTEGER) | |
381 | || !bs->ca) { | |
382 | x->ex_flags |= EXFLAG_INVALID; | |
383 | x->ex_pathlen = 0; | |
384 | } else x->ex_pathlen = ASN1_INTEGER_get(bs->pathlen); | |
385 | } else x->ex_pathlen = -1; | |
386 | BASIC_CONSTRAINTS_free(bs); | |
387 | x->ex_flags |= EXFLAG_BCONS; | |
388 | } | |
6951c23a RL |
389 | /* Handle proxy certificates */ |
390 | if((pci=X509_get_ext_d2i(x, NID_proxyCertInfo, NULL, NULL))) { | |
d9bfe4f9 RL |
391 | if (x->ex_flags & EXFLAG_CA |
392 | || X509_get_ext_by_NID(x, NID_subject_alt_name, 0) >= 0 | |
393 | || X509_get_ext_by_NID(x, NID_issuer_alt_name, 0) >= 0) { | |
6951c23a RL |
394 | x->ex_flags |= EXFLAG_INVALID; |
395 | } | |
396 | if (pci->pcPathLengthConstraint) { | |
397 | x->ex_pcpathlen = | |
398 | ASN1_INTEGER_get(pci->pcPathLengthConstraint); | |
399 | } else x->ex_pcpathlen = -1; | |
400 | PROXY_CERT_INFO_EXTENSION_free(pci); | |
401 | x->ex_flags |= EXFLAG_PROXY; | |
402 | } | |
673b102c | 403 | /* Handle key usage */ |
ff8a4c47 | 404 | if((usage=X509_get_ext_d2i(x, NID_key_usage, NULL, NULL))) { |
673b102c DSH |
405 | if(usage->length > 0) { |
406 | x->ex_kusage = usage->data[0]; | |
407 | if(usage->length > 1) | |
408 | x->ex_kusage |= usage->data[1] << 8; | |
409 | } else x->ex_kusage = 0; | |
410 | x->ex_flags |= EXFLAG_KUSAGE; | |
411 | ASN1_BIT_STRING_free(usage); | |
412 | } | |
413 | x->ex_xkusage = 0; | |
ff8a4c47 | 414 | if((extusage=X509_get_ext_d2i(x, NID_ext_key_usage, NULL, NULL))) { |
673b102c DSH |
415 | x->ex_flags |= EXFLAG_XKUSAGE; |
416 | for(i = 0; i < sk_ASN1_OBJECT_num(extusage); i++) { | |
417 | switch(OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage,i))) { | |
418 | case NID_server_auth: | |
419 | x->ex_xkusage |= XKU_SSL_SERVER; | |
420 | break; | |
421 | ||
422 | case NID_client_auth: | |
423 | x->ex_xkusage |= XKU_SSL_CLIENT; | |
424 | break; | |
425 | ||
426 | case NID_email_protect: | |
427 | x->ex_xkusage |= XKU_SMIME; | |
428 | break; | |
429 | ||
430 | case NID_code_sign: | |
431 | x->ex_xkusage |= XKU_CODE_SIGN; | |
432 | break; | |
433 | ||
434 | case NID_ms_sgc: | |
435 | case NID_ns_sgc: | |
436 | x->ex_xkusage |= XKU_SGC; | |
81f169e9 DSH |
437 | break; |
438 | ||
439 | case NID_OCSP_sign: | |
440 | x->ex_xkusage |= XKU_OCSP_SIGN; | |
441 | break; | |
442 | ||
443 | case NID_time_stamp: | |
444 | x->ex_xkusage |= XKU_TIMESTAMP; | |
445 | break; | |
b637670f RL |
446 | |
447 | case NID_dvcs: | |
448 | x->ex_xkusage |= XKU_DVCS; | |
449 | break; | |
673b102c DSH |
450 | } |
451 | } | |
452 | sk_ASN1_OBJECT_pop_free(extusage, ASN1_OBJECT_free); | |
453 | } | |
454 | ||
ff8a4c47 | 455 | if((ns=X509_get_ext_d2i(x, NID_netscape_cert_type, NULL, NULL))) { |
673b102c DSH |
456 | if(ns->length > 0) x->ex_nscert = ns->data[0]; |
457 | else x->ex_nscert = 0; | |
458 | x->ex_flags |= EXFLAG_NSCERT; | |
459 | ASN1_BIT_STRING_free(ns); | |
460 | } | |
2f043896 DSH |
461 | x->skid =X509_get_ext_d2i(x, NID_subject_key_identifier, NULL, NULL); |
462 | x->akid =X509_get_ext_d2i(x, NID_authority_key_identifier, NULL, NULL); | |
e9746e03 DSH |
463 | x->altname = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL); |
464 | x->nc = X509_get_ext_d2i(x, NID_name_constraints, &i, NULL); | |
465 | if (!x->nc && (i != -1)) | |
466 | x->ex_flags |= EXFLAG_INVALID; | |
3e727a3b DSH |
467 | setup_crldp(x); |
468 | ||
469 | ||
10ca15f3 | 470 | #ifndef OPENSSL_NO_RFC3779 |
96ea4ae9 BL |
471 | x->rfc3779_addr =X509_get_ext_d2i(x, NID_sbgp_ipAddrBlock, NULL, NULL); |
472 | x->rfc3779_asid =X509_get_ext_d2i(x, NID_sbgp_autonomousSysNum, | |
473 | NULL, NULL); | |
474 | #endif | |
f1558bb4 DSH |
475 | for (i = 0; i < X509_get_ext_count(x); i++) |
476 | { | |
477 | ex = X509_get_ext(x, i); | |
478 | if (!X509_EXTENSION_get_critical(ex)) | |
479 | continue; | |
480 | if (!X509_supported_extension(ex)) | |
481 | { | |
482 | x->ex_flags |= EXFLAG_CRITICAL; | |
483 | break; | |
484 | } | |
485 | } | |
673b102c DSH |
486 | x->ex_flags |= EXFLAG_SET; |
487 | } | |
488 | ||
489 | /* CA checks common to all purposes | |
490 | * return codes: | |
491 | * 0 not a CA | |
492 | * 1 is a CA | |
493 | * 2 basicConstraints absent so "maybe" a CA | |
494 | * 3 basicConstraints absent but self signed V1. | |
bc501570 | 495 | * 4 basicConstraints absent but keyUsage present and keyCertSign asserted. |
673b102c DSH |
496 | */ |
497 | ||
498 | #define V1_ROOT (EXFLAG_V1|EXFLAG_SS) | |
499 | #define ku_reject(x, usage) \ | |
500 | (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage))) | |
501 | #define xku_reject(x, usage) \ | |
502 | (((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage))) | |
503 | #define ns_reject(x, usage) \ | |
504 | (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage))) | |
505 | ||
5073ff03 | 506 | static int check_ca(const X509 *x) |
673b102c DSH |
507 | { |
508 | /* keyUsage if present should allow cert signing */ | |
509 | if(ku_reject(x, KU_KEY_CERT_SIGN)) return 0; | |
510 | if(x->ex_flags & EXFLAG_BCONS) { | |
511 | if(x->ex_flags & EXFLAG_CA) return 1; | |
512 | /* If basicConstraints says not a CA then say so */ | |
513 | else return 0; | |
514 | } else { | |
30b415b0 | 515 | /* we support V1 roots for... uh, I don't really know why. */ |
673b102c | 516 | if((x->ex_flags & V1_ROOT) == V1_ROOT) return 3; |
8cff6331 | 517 | /* If key usage present it must have certSign so tolerate it */ |
bc501570 | 518 | else if (x->ex_flags & EXFLAG_KUSAGE) return 4; |
30b415b0 RL |
519 | /* Older certificates could have Netscape-specific CA types */ |
520 | else if (x->ex_flags & EXFLAG_NSCERT | |
521 | && x->ex_nscert & NS_ANY_CA) return 5; | |
30b415b0 RL |
522 | /* can this still be regarded a CA certificate? I doubt it */ |
523 | return 0; | |
673b102c DSH |
524 | } |
525 | } | |
526 | ||
5073ff03 RL |
527 | int X509_check_ca(X509 *x) |
528 | { | |
529 | if(!(x->ex_flags & EXFLAG_SET)) { | |
530 | CRYPTO_w_lock(CRYPTO_LOCK_X509); | |
531 | x509v3_cache_extensions(x); | |
532 | CRYPTO_w_unlock(CRYPTO_LOCK_X509); | |
533 | } | |
534 | ||
535 | return check_ca(x); | |
536 | } | |
537 | ||
0cb957a6 | 538 | /* Check SSL CA: common checks for SSL client and server */ |
ccd86b68 | 539 | static int check_ssl_ca(const X509 *x) |
0cb957a6 DSH |
540 | { |
541 | int ca_ret; | |
5073ff03 | 542 | ca_ret = check_ca(x); |
0cb957a6 DSH |
543 | if(!ca_ret) return 0; |
544 | /* check nsCertType if present */ | |
30b415b0 | 545 | if(ca_ret != 5 || x->ex_nscert & NS_SSL_CA) return ca_ret; |
0cb957a6 DSH |
546 | else return 0; |
547 | } | |
8cff6331 | 548 | |
673b102c | 549 | |
ccd86b68 | 550 | static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x, int ca) |
673b102c DSH |
551 | { |
552 | if(xku_reject(x,XKU_SSL_CLIENT)) return 0; | |
0cb957a6 | 553 | if(ca) return check_ssl_ca(x); |
673b102c DSH |
554 | /* We need to do digital signatures with it */ |
555 | if(ku_reject(x,KU_DIGITAL_SIGNATURE)) return 0; | |
556 | /* nsCertType if present should allow SSL client use */ | |
557 | if(ns_reject(x, NS_SSL_CLIENT)) return 0; | |
558 | return 1; | |
559 | } | |
560 | ||
ccd86b68 | 561 | static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x, int ca) |
673b102c DSH |
562 | { |
563 | if(xku_reject(x,XKU_SSL_SERVER|XKU_SGC)) return 0; | |
0cb957a6 | 564 | if(ca) return check_ssl_ca(x); |
673b102c DSH |
565 | |
566 | if(ns_reject(x, NS_SSL_SERVER)) return 0; | |
567 | /* Now as for keyUsage: we'll at least need to sign OR encipher */ | |
568 | if(ku_reject(x, KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT)) return 0; | |
569 | ||
570 | return 1; | |
571 | ||
572 | } | |
573 | ||
ccd86b68 | 574 | static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x, int ca) |
673b102c DSH |
575 | { |
576 | int ret; | |
577 | ret = check_purpose_ssl_server(xp, x, ca); | |
578 | if(!ret || ca) return ret; | |
579 | /* We need to encipher or Netscape complains */ | |
580 | if(ku_reject(x, KU_KEY_ENCIPHERMENT)) return 0; | |
581 | return ret; | |
582 | } | |
583 | ||
584 | /* common S/MIME checks */ | |
ccd86b68 | 585 | static int purpose_smime(const X509 *x, int ca) |
673b102c DSH |
586 | { |
587 | if(xku_reject(x,XKU_SMIME)) return 0; | |
588 | if(ca) { | |
589 | int ca_ret; | |
5073ff03 | 590 | ca_ret = check_ca(x); |
673b102c DSH |
591 | if(!ca_ret) return 0; |
592 | /* check nsCertType if present */ | |
30b415b0 | 593 | if(ca_ret != 5 || x->ex_nscert & NS_SMIME_CA) return ca_ret; |
673b102c DSH |
594 | else return 0; |
595 | } | |
596 | if(x->ex_flags & EXFLAG_NSCERT) { | |
597 | if(x->ex_nscert & NS_SMIME) return 1; | |
598 | /* Workaround for some buggy certificates */ | |
599 | if(x->ex_nscert & NS_SSL_CLIENT) return 2; | |
600 | return 0; | |
601 | } | |
602 | return 1; | |
603 | } | |
604 | ||
ccd86b68 | 605 | static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x, int ca) |
673b102c DSH |
606 | { |
607 | int ret; | |
608 | ret = purpose_smime(x, ca); | |
609 | if(!ret || ca) return ret; | |
8cff6331 | 610 | if(ku_reject(x, KU_DIGITAL_SIGNATURE|KU_NON_REPUDIATION)) return 0; |
673b102c DSH |
611 | return ret; |
612 | } | |
613 | ||
ccd86b68 | 614 | static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x, int ca) |
673b102c DSH |
615 | { |
616 | int ret; | |
617 | ret = purpose_smime(x, ca); | |
618 | if(!ret || ca) return ret; | |
619 | if(ku_reject(x, KU_KEY_ENCIPHERMENT)) return 0; | |
620 | return ret; | |
621 | } | |
622 | ||
ccd86b68 | 623 | static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x, int ca) |
673b102c DSH |
624 | { |
625 | if(ca) { | |
626 | int ca_ret; | |
5073ff03 | 627 | if((ca_ret = check_ca(x)) != 2) return ca_ret; |
673b102c DSH |
628 | else return 0; |
629 | } | |
630 | if(ku_reject(x, KU_CRL_SIGN)) return 0; | |
631 | return 1; | |
632 | } | |
068fdce8 | 633 | |
81f169e9 DSH |
634 | /* OCSP helper: this is *not* a full OCSP check. It just checks that |
635 | * each CA is valid. Additional checks must be made on the chain. | |
636 | */ | |
637 | ||
638 | static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca) | |
639 | { | |
30b415b0 RL |
640 | /* Must be a valid CA. Should we really support the "I don't know" |
641 | value (2)? */ | |
5073ff03 | 642 | if(ca) return check_ca(x); |
81f169e9 DSH |
643 | /* leaf certificate is checked in OCSP_verify() */ |
644 | return 1; | |
645 | } | |
646 | ||
c7235be6 UM |
647 | static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x, |
648 | int ca) | |
649 | { | |
650 | int i_ext; | |
651 | ||
652 | /* If ca is true we must return if this is a valid CA certificate. */ | |
653 | if (ca) return check_ca(x); | |
654 | ||
655 | /* | |
656 | * Check the optional key usage field: | |
657 | * if Key Usage is present, it must be one of digitalSignature | |
658 | * and/or nonRepudiation (other values are not consistent and shall | |
659 | * be rejected). | |
660 | */ | |
661 | if ((x->ex_flags & EXFLAG_KUSAGE) | |
662 | && ((x->ex_kusage & ~(KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE)) || | |
663 | !(x->ex_kusage & (KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE)))) | |
664 | return 0; | |
665 | ||
666 | /* Only time stamp key usage is permitted and it's required. */ | |
667 | if (!(x->ex_flags & EXFLAG_XKUSAGE) || x->ex_xkusage != XKU_TIMESTAMP) | |
668 | return 0; | |
669 | ||
670 | /* Extended Key Usage MUST be critical */ | |
671 | i_ext = X509_get_ext_by_NID((X509 *) x, NID_ext_key_usage, 0); | |
672 | if (i_ext >= 0) | |
673 | { | |
674 | X509_EXTENSION *ext = X509_get_ext((X509 *) x, i_ext); | |
675 | if (!X509_EXTENSION_get_critical(ext)) | |
676 | return 0; | |
677 | } | |
678 | ||
679 | return 1; | |
680 | } | |
681 | ||
ccd86b68 | 682 | static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca) |
068fdce8 DSH |
683 | { |
684 | return 1; | |
685 | } | |
2f043896 DSH |
686 | |
687 | /* Various checks to see if one certificate issued the second. | |
688 | * This can be used to prune a set of possible issuer certificates | |
689 | * which have been looked up using some simple method such as by | |
690 | * subject name. | |
691 | * These are: | |
692 | * 1. Check issuer_name(subject) == subject_name(issuer) | |
693 | * 2. If akid(subject) exists check it matches issuer | |
694 | * 3. If key_usage(issuer) exists check it supports certificate signing | |
695 | * returns 0 for OK, positive for reason for mismatch, reasons match | |
696 | * codes for X509_verify_cert() | |
697 | */ | |
698 | ||
699 | int X509_check_issued(X509 *issuer, X509 *subject) | |
700 | { | |
701 | if(X509_NAME_cmp(X509_get_subject_name(issuer), | |
702 | X509_get_issuer_name(subject))) | |
703 | return X509_V_ERR_SUBJECT_ISSUER_MISMATCH; | |
704 | x509v3_cache_extensions(issuer); | |
705 | x509v3_cache_extensions(subject); | |
bc7535bc DSH |
706 | |
707 | if(subject->akid) | |
708 | { | |
709 | int ret = X509_check_akid(issuer, subject->akid); | |
710 | if (ret != X509_V_OK) | |
711 | return ret; | |
2f043896 | 712 | } |
bc7535bc | 713 | |
6951c23a RL |
714 | if(subject->ex_flags & EXFLAG_PROXY) |
715 | { | |
716 | if(ku_reject(issuer, KU_DIGITAL_SIGNATURE)) | |
717 | return X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE; | |
718 | } | |
719 | else if(ku_reject(issuer, KU_KEY_CERT_SIGN)) | |
720 | return X509_V_ERR_KEYUSAGE_NO_CERTSIGN; | |
2f043896 DSH |
721 | return X509_V_OK; |
722 | } | |
723 | ||
bc7535bc DSH |
724 | int X509_check_akid(X509 *issuer, AUTHORITY_KEYID *akid) |
725 | { | |
726 | ||
727 | if(!akid) | |
728 | return X509_V_OK; | |
729 | ||
730 | /* Check key ids (if present) */ | |
731 | if(akid->keyid && issuer->skid && | |
732 | ASN1_OCTET_STRING_cmp(akid->keyid, issuer->skid) ) | |
733 | return X509_V_ERR_AKID_SKID_MISMATCH; | |
734 | /* Check serial number */ | |
735 | if(akid->serial && | |
736 | ASN1_INTEGER_cmp(X509_get_serialNumber(issuer), akid->serial)) | |
737 | return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH; | |
738 | /* Check issuer name */ | |
739 | if(akid->issuer) | |
740 | { | |
741 | /* Ugh, for some peculiar reason AKID includes | |
742 | * SEQUENCE OF GeneralName. So look for a DirName. | |
743 | * There may be more than one but we only take any | |
744 | * notice of the first. | |
745 | */ | |
746 | GENERAL_NAMES *gens; | |
747 | GENERAL_NAME *gen; | |
748 | X509_NAME *nm = NULL; | |
749 | int i; | |
750 | gens = akid->issuer; | |
751 | for(i = 0; i < sk_GENERAL_NAME_num(gens); i++) | |
752 | { | |
753 | gen = sk_GENERAL_NAME_value(gens, i); | |
754 | if(gen->type == GEN_DIRNAME) | |
755 | { | |
756 | nm = gen->d.dirn; | |
757 | break; | |
758 | } | |
759 | } | |
760 | if(nm && X509_NAME_cmp(nm, X509_get_issuer_name(issuer))) | |
761 | return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH; | |
762 | } | |
763 | return X509_V_OK; | |
764 | } | |
765 |