2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 1999 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
61 #include <openssl/x509v3.h>
64 static void x509v3_cache_extensions(X509 *x);
66 static int ca_check(X509 *x);
67 static int check_purpose_ssl_client(X509_PURPOSE *xp, X509 *x, int ca);
68 static int check_purpose_ssl_server(X509_PURPOSE *xp, X509 *x, int ca);
69 static int check_purpose_ns_ssl_server(X509_PURPOSE *xp, X509 *x, int ca);
70 static int purpose_smime(X509 *x, int ca);
71 static int check_purpose_smime_sign(X509_PURPOSE *xp, X509 *x, int ca);
72 static int check_purpose_smime_encrypt(X509_PURPOSE *xp, X509 *x, int ca);
73 static int check_purpose_crl_sign(X509_PURPOSE *xp, X509 *x, int ca);
75 static int xp_cmp(X509_PURPOSE **a, X509_PURPOSE **b);
76 static void xptable_free(X509_PURPOSE *p);
78 static X509_PURPOSE xstandard[] = {
79 {X509_PURPOSE_SSL_CLIENT, X509_TRUST_SSL_CLIENT, 0, check_purpose_ssl_client, "SSL client", "sslclient", NULL},
80 {X509_PURPOSE_SSL_SERVER, X509_TRUST_SSL_SERVER, 0, check_purpose_ssl_server, "SSL server", "sslserver", NULL},
81 {X509_PURPOSE_NS_SSL_SERVER, X509_TRUST_SSL_SERVER, 0, check_purpose_ns_ssl_server, "Netscape SSL server", "nssslserver", NULL},
82 {X509_PURPOSE_SMIME_SIGN, X509_TRUST_EMAIL, 0, check_purpose_smime_sign, "S/MIME signing", "smimesign", NULL},
83 {X509_PURPOSE_SMIME_ENCRYPT, X509_TRUST_EMAIL, 0, check_purpose_smime_encrypt, "S/MIME encryption", "smimeencrypt", NULL},
84 {X509_PURPOSE_CRL_SIGN, X509_TRUST_ANY, 0, check_purpose_crl_sign, "CRL signing", "crlsign", NULL},
85 {-1, 0, 0, NULL, NULL, NULL, NULL}
88 IMPLEMENT_STACK_OF(X509_PURPOSE)
90 static STACK_OF(X509_PURPOSE) *xptable = NULL;
92 static int xp_cmp(X509_PURPOSE **a, X509_PURPOSE **b)
94 return (*a)->purpose - (*b)->purpose;
97 int X509_check_purpose(X509 *x, int id, int ca)
101 if(!(x->ex_flags & EXFLAG_SET)) {
102 CRYPTO_w_lock(CRYPTO_LOCK_X509);
104 x509v3_cache_extensions(x);
105 CRYPTO_w_unlock(CRYPTO_LOCK_X509);
107 if(id == -1) return 1;
108 idx = X509_PURPOSE_get_by_id(id);
109 if(idx == -1) return -1;
110 pt = sk_X509_PURPOSE_value(xptable, idx);
111 return pt->check_purpose(pt, x,ca);
114 int X509_PURPOSE_get_count(void)
116 return sk_X509_PURPOSE_num(xptable);
119 X509_PURPOSE * X509_PURPOSE_iget(int idx)
121 return sk_X509_PURPOSE_value(xptable, idx);
124 int X509_PURPOSE_get_by_sname(char *sname)
128 for(i = 0; i < sk_X509_PURPOSE_num(xptable); i++) {
129 xptmp = sk_X509_PURPOSE_value(xptable, i);
130 if(!strcmp(xptmp->sname, sname)) return i;
136 int X509_PURPOSE_get_by_id(int purpose)
139 tmp.purpose = purpose;
140 if(!xptable) return -1;
141 return sk_X509_PURPOSE_find(xptable, &tmp);
144 int X509_PURPOSE_add(X509_PURPOSE *xp)
149 xptable = sk_X509_PURPOSE_new(xp_cmp);
152 X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE);
157 idx = X509_PURPOSE_get_by_id(xp->purpose);
159 xptable_free(sk_X509_PURPOSE_value(xptable, idx));
160 sk_X509_PURPOSE_set(xptable, idx, xp);
162 if (!sk_X509_PURPOSE_push(xptable, xp)) {
163 X509V3err(X509V3_F_X509_PURPOSE_ADD,ERR_R_MALLOC_FAILURE);
170 static void xptable_free(X509_PURPOSE *p)
173 if (p->flags & X509_PURPOSE_DYNAMIC)
175 if (p->flags & X509_PURPOSE_DYNAMIC_NAME) {
183 void X509_PURPOSE_cleanup(void)
185 sk_X509_PURPOSE_pop_free(xptable, xptable_free);
189 void X509_PURPOSE_add_standard(void)
192 for(xp = xstandard; xp->name; xp++) X509_PURPOSE_add(xp);
195 int X509_PURPOSE_get_id(X509_PURPOSE *xp)
200 char *X509_PURPOSE_iget_name(X509_PURPOSE *xp)
205 char *X509_PURPOSE_iget_sname(X509_PURPOSE *xp)
210 int X509_PURPOSE_get_trust(X509_PURPOSE *xp)
215 static void x509v3_cache_extensions(X509 *x)
217 BASIC_CONSTRAINTS *bs;
218 ASN1_BIT_STRING *usage;
220 STACK_OF(ASN1_OBJECT) *extusage;
222 if(x->ex_flags & EXFLAG_SET) return;
223 X509_digest(x, EVP_sha1(), x->sha1_hash, NULL);
224 /* Does subject name match issuer ? */
225 if(!X509_NAME_cmp(X509_get_subject_name(x), X509_get_issuer_name(x)))
226 x->ex_flags |= EXFLAG_SS;
227 /* V1 should mean no extensions ... */
228 if(!X509_get_version(x)) x->ex_flags |= EXFLAG_V1;
229 /* Handle basic constraints */
230 if((bs=X509V3_X509_get_d2i(x, NID_basic_constraints, NULL, NULL))) {
231 if(bs->ca) x->ex_flags |= EXFLAG_CA;
233 if((bs->pathlen->type == V_ASN1_NEG_INTEGER)
235 x->ex_flags |= EXFLAG_INVALID;
237 } else x->ex_pathlen = ASN1_INTEGER_get(bs->pathlen);
238 } else x->ex_pathlen = -1;
239 BASIC_CONSTRAINTS_free(bs);
240 x->ex_flags |= EXFLAG_BCONS;
242 /* Handle key usage */
243 if((usage=X509V3_X509_get_d2i(x, NID_key_usage, NULL, NULL))) {
244 if(usage->length > 0) {
245 x->ex_kusage = usage->data[0];
246 if(usage->length > 1)
247 x->ex_kusage |= usage->data[1] << 8;
248 } else x->ex_kusage = 0;
249 x->ex_flags |= EXFLAG_KUSAGE;
250 ASN1_BIT_STRING_free(usage);
253 if((extusage=X509V3_X509_get_d2i(x, NID_ext_key_usage, NULL, NULL))) {
254 x->ex_flags |= EXFLAG_XKUSAGE;
255 for(i = 0; i < sk_ASN1_OBJECT_num(extusage); i++) {
256 switch(OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage,i))) {
257 case NID_server_auth:
258 x->ex_xkusage |= XKU_SSL_SERVER;
261 case NID_client_auth:
262 x->ex_xkusage |= XKU_SSL_CLIENT;
265 case NID_email_protect:
266 x->ex_xkusage |= XKU_SMIME;
270 x->ex_xkusage |= XKU_CODE_SIGN;
275 x->ex_xkusage |= XKU_SGC;
278 sk_ASN1_OBJECT_pop_free(extusage, ASN1_OBJECT_free);
281 if((ns=X509V3_X509_get_d2i(x, NID_netscape_cert_type, NULL, NULL))) {
282 if(ns->length > 0) x->ex_nscert = ns->data[0];
283 else x->ex_nscert = 0;
284 x->ex_flags |= EXFLAG_NSCERT;
285 ASN1_BIT_STRING_free(ns);
287 x->ex_flags |= EXFLAG_SET;
290 /* CA checks common to all purposes
294 * 2 basicConstraints absent so "maybe" a CA
295 * 3 basicConstraints absent but self signed V1.
298 #define V1_ROOT (EXFLAG_V1|EXFLAG_SS)
299 #define ku_reject(x, usage) \
300 (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage)))
301 #define xku_reject(x, usage) \
302 (((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage)))
303 #define ns_reject(x, usage) \
304 (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage)))
306 static int ca_check(X509 *x)
308 /* keyUsage if present should allow cert signing */
309 if(ku_reject(x, KU_KEY_CERT_SIGN)) return 0;
310 if(x->ex_flags & EXFLAG_BCONS) {
311 if(x->ex_flags & EXFLAG_CA) return 1;
312 /* If basicConstraints says not a CA then say so */
315 if((x->ex_flags & V1_ROOT) == V1_ROOT) return 3;
321 static int check_purpose_ssl_client(X509_PURPOSE *xp, X509 *x, int ca)
323 if(xku_reject(x,XKU_SSL_CLIENT)) return 0;
326 ca_ret = ca_check(x);
327 if(!ca_ret) return 0;
328 /* check nsCertType if present */
329 if(x->ex_flags & EXFLAG_NSCERT) {
330 if(x->ex_nscert & NS_SSL_CA) return ca_ret;
333 if(ca_ret != 2) return ca_ret;
336 /* We need to do digital signatures with it */
337 if(ku_reject(x,KU_DIGITAL_SIGNATURE)) return 0;
338 /* nsCertType if present should allow SSL client use */
339 if(ns_reject(x, NS_SSL_CLIENT)) return 0;
343 static int check_purpose_ssl_server(X509_PURPOSE *xp, X509 *x, int ca)
345 if(xku_reject(x,XKU_SSL_SERVER|XKU_SGC)) return 0;
346 /* Otherwise same as SSL client for a CA */
347 if(ca) return check_purpose_ssl_client(xp, x, 1);
349 if(ns_reject(x, NS_SSL_SERVER)) return 0;
350 /* Now as for keyUsage: we'll at least need to sign OR encipher */
351 if(ku_reject(x, KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT)) return 0;
357 static int check_purpose_ns_ssl_server(X509_PURPOSE *xp, X509 *x, int ca)
360 ret = check_purpose_ssl_server(xp, x, ca);
361 if(!ret || ca) return ret;
362 /* We need to encipher or Netscape complains */
363 if(ku_reject(x, KU_KEY_ENCIPHERMENT)) return 0;
367 /* common S/MIME checks */
368 static int purpose_smime(X509 *x, int ca)
370 if(xku_reject(x,XKU_SMIME)) return 0;
373 ca_ret = ca_check(x);
374 if(!ca_ret) return 0;
375 /* check nsCertType if present */
376 if(x->ex_flags & EXFLAG_NSCERT) {
377 if(x->ex_nscert & NS_SMIME_CA) return ca_ret;
380 if(ca_ret != 2) return ca_ret;
383 if(x->ex_flags & EXFLAG_NSCERT) {
384 if(x->ex_nscert & NS_SMIME) return 1;
385 /* Workaround for some buggy certificates */
386 if(x->ex_nscert & NS_SSL_CLIENT) return 2;
392 static int check_purpose_smime_sign(X509_PURPOSE *xp, X509 *x, int ca)
395 ret = purpose_smime(x, ca);
396 if(!ret || ca) return ret;
397 if(ku_reject(x, KU_DIGITAL_SIGNATURE)) return 0;
401 static int check_purpose_smime_encrypt(X509_PURPOSE *xp, X509 *x, int ca)
404 ret = purpose_smime(x, ca);
405 if(!ret || ca) return ret;
406 if(ku_reject(x, KU_KEY_ENCIPHERMENT)) return 0;
410 static int check_purpose_crl_sign(X509_PURPOSE *xp, X509 *x, int ca)
414 if((ca_ret = ca_check(x)) != 2) return ca_ret;
417 if(ku_reject(x, KU_CRL_SIGN)) return 0;