3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
6 /* ====================================================================
7 * Copyright (c) 2003 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
61 #include "internal/cryptlib.h"
62 #include <openssl/asn1t.h>
63 #include <openssl/conf.h>
64 #include <openssl/x509v3.h>
66 #include "internal/x509_int.h"
69 static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
71 STACK_OF(CONF_VALUE) *nval);
72 static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, void *a,
74 static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
75 STACK_OF(GENERAL_SUBTREE) *trees, BIO *bp,
77 static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip);
79 static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc);
80 static int nc_match_single(GENERAL_NAME *sub, GENERAL_NAME *gen);
81 static int nc_dn(X509_NAME *sub, X509_NAME *nm);
82 static int nc_dns(ASN1_IA5STRING *sub, ASN1_IA5STRING *dns);
83 static int nc_email(ASN1_IA5STRING *sub, ASN1_IA5STRING *eml);
84 static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base);
85 static int nc_ip(ASN1_OCTET_STRING *ip, ASN1_OCTET_STRING *base);
87 const X509V3_EXT_METHOD v3_name_constraints = {
88 NID_name_constraints, 0,
89 ASN1_ITEM_ref(NAME_CONSTRAINTS),
92 0, v2i_NAME_CONSTRAINTS,
93 i2r_NAME_CONSTRAINTS, 0,
97 ASN1_SEQUENCE(GENERAL_SUBTREE) = {
98 ASN1_SIMPLE(GENERAL_SUBTREE, base, GENERAL_NAME),
99 ASN1_IMP_OPT(GENERAL_SUBTREE, minimum, ASN1_INTEGER, 0),
100 ASN1_IMP_OPT(GENERAL_SUBTREE, maximum, ASN1_INTEGER, 1)
101 } ASN1_SEQUENCE_END(GENERAL_SUBTREE)
103 ASN1_SEQUENCE(NAME_CONSTRAINTS) = {
104 ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, permittedSubtrees,
106 ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, excludedSubtrees,
108 } ASN1_SEQUENCE_END(NAME_CONSTRAINTS)
111 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(GENERAL_SUBTREE)
112 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(NAME_CONSTRAINTS)
114 static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
115 X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)
118 CONF_VALUE tval, *val;
119 STACK_OF(GENERAL_SUBTREE) **ptree = NULL;
120 NAME_CONSTRAINTS *ncons = NULL;
121 GENERAL_SUBTREE *sub = NULL;
123 ncons = NAME_CONSTRAINTS_new();
126 for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
127 val = sk_CONF_VALUE_value(nval, i);
128 if (strncmp(val->name, "permitted", 9) == 0 && val->name[9]) {
129 ptree = &ncons->permittedSubtrees;
130 tval.name = val->name + 10;
131 } else if (strncmp(val->name, "excluded", 8) == 0 && val->name[8]) {
132 ptree = &ncons->excludedSubtrees;
133 tval.name = val->name + 9;
135 X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, X509V3_R_INVALID_SYNTAX);
138 tval.value = val->value;
139 sub = GENERAL_SUBTREE_new();
140 if (!v2i_GENERAL_NAME_ex(sub->base, method, ctx, &tval, 1))
143 *ptree = sk_GENERAL_SUBTREE_new_null();
144 if (!*ptree || !sk_GENERAL_SUBTREE_push(*ptree, sub))
152 X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, ERR_R_MALLOC_FAILURE);
154 NAME_CONSTRAINTS_free(ncons);
155 GENERAL_SUBTREE_free(sub);
160 static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, void *a,
163 NAME_CONSTRAINTS *ncons = a;
164 do_i2r_name_constraints(method, ncons->permittedSubtrees,
165 bp, ind, "Permitted");
166 do_i2r_name_constraints(method, ncons->excludedSubtrees,
167 bp, ind, "Excluded");
171 static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
172 STACK_OF(GENERAL_SUBTREE) *trees,
173 BIO *bp, int ind, char *name)
175 GENERAL_SUBTREE *tree;
177 if (sk_GENERAL_SUBTREE_num(trees) > 0)
178 BIO_printf(bp, "%*s%s:\n", ind, "", name);
179 for (i = 0; i < sk_GENERAL_SUBTREE_num(trees); i++) {
180 tree = sk_GENERAL_SUBTREE_value(trees, i);
181 BIO_printf(bp, "%*s", ind + 2, "");
182 if (tree->base->type == GEN_IPADD)
183 print_nc_ipadd(bp, tree->base->d.ip);
185 GENERAL_NAME_print(bp, tree->base);
191 static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip)
199 BIO_printf(bp, "%d.%d.%d.%d/%d.%d.%d.%d",
200 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
201 } else if (len == 32) {
202 for (i = 0; i < 16; i++) {
203 BIO_printf(bp, "%X", p[0] << 8 | p[1]);
211 BIO_printf(bp, "IP Address:<invalid>");
216 * Check a certificate conforms to a specified set of constraints.
218 * X509_V_OK: All constraints obeyed.
219 * X509_V_ERR_PERMITTED_VIOLATION: Permitted subtree violation.
220 * X509_V_ERR_EXCLUDED_VIOLATION: Excluded subtree violation.
221 * X509_V_ERR_SUBTREE_MINMAX: Min or max values present and matching type.
222 * X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE: Unsupported constraint type.
223 * X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: bad unsupported constraint syntax.
224 * X509_V_ERR_UNSUPPORTED_NAME_SYNTAX: bad or unsupported syntax of name
227 int NAME_CONSTRAINTS_check(X509 *x, NAME_CONSTRAINTS *nc)
232 nm = X509_get_subject_name(x);
234 if (X509_NAME_entry_count(nm) > 0) {
236 gntmp.type = GEN_DIRNAME;
237 gntmp.d.directoryName = nm;
239 r = nc_match(&gntmp, nc);
244 gntmp.type = GEN_EMAIL;
246 /* Process any email address attributes in subject name */
250 i = X509_NAME_get_index_by_NID(nm, NID_pkcs9_emailAddress, i);
253 ne = X509_NAME_get_entry(nm, i);
254 gntmp.d.rfc822Name = X509_NAME_ENTRY_get_data(ne);
255 if (gntmp.d.rfc822Name->type != V_ASN1_IA5STRING)
256 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
258 r = nc_match(&gntmp, nc);
266 for (i = 0; i < sk_GENERAL_NAME_num(x->altname); i++) {
267 GENERAL_NAME *gen = sk_GENERAL_NAME_value(x->altname, i);
268 r = nc_match(gen, nc);
277 static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc)
279 GENERAL_SUBTREE *sub;
283 * Permitted subtrees: if any subtrees exist of matching the type at
284 * least one subtree must match.
287 for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->permittedSubtrees); i++) {
288 sub = sk_GENERAL_SUBTREE_value(nc->permittedSubtrees, i);
289 if (gen->type != sub->base->type)
291 if (sub->minimum || sub->maximum)
292 return X509_V_ERR_SUBTREE_MINMAX;
293 /* If we already have a match don't bother trying any more */
298 r = nc_match_single(gen, sub->base);
301 else if (r != X509_V_ERR_PERMITTED_VIOLATION)
306 return X509_V_ERR_PERMITTED_VIOLATION;
308 /* Excluded subtrees: must not match any of these */
310 for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->excludedSubtrees); i++) {
311 sub = sk_GENERAL_SUBTREE_value(nc->excludedSubtrees, i);
312 if (gen->type != sub->base->type)
314 if (sub->minimum || sub->maximum)
315 return X509_V_ERR_SUBTREE_MINMAX;
317 r = nc_match_single(gen, sub->base);
319 return X509_V_ERR_EXCLUDED_VIOLATION;
320 else if (r != X509_V_ERR_PERMITTED_VIOLATION)
329 static int nc_match_single(GENERAL_NAME *gen, GENERAL_NAME *base)
331 switch (base->type) {
333 return nc_dn(gen->d.directoryName, base->d.directoryName);
336 return nc_dns(gen->d.dNSName, base->d.dNSName);
339 return nc_email(gen->d.rfc822Name, base->d.rfc822Name);
342 return nc_uri(gen->d.uniformResourceIdentifier,
343 base->d.uniformResourceIdentifier);
346 return nc_ip(gen->d.iPAddress, base->d.iPAddress);
349 return X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE;
355 * directoryName name constraint matching. The canonical encoding of
356 * X509_NAME makes this comparison easy. It is matched if the subtree is a
357 * subset of the name.
360 static int nc_dn(X509_NAME *nm, X509_NAME *base)
362 /* Ensure canonical encodings are up to date. */
363 if (nm->modified && i2d_X509_NAME(nm, NULL) < 0)
364 return X509_V_ERR_OUT_OF_MEM;
365 if (base->modified && i2d_X509_NAME(base, NULL) < 0)
366 return X509_V_ERR_OUT_OF_MEM;
367 if (base->canon_enclen > nm->canon_enclen)
368 return X509_V_ERR_PERMITTED_VIOLATION;
369 if (memcmp(base->canon_enc, nm->canon_enc, base->canon_enclen))
370 return X509_V_ERR_PERMITTED_VIOLATION;
374 static int nc_dns(ASN1_IA5STRING *dns, ASN1_IA5STRING *base)
376 char *baseptr = (char *)base->data;
377 char *dnsptr = (char *)dns->data;
378 /* Empty matches everything */
382 * Otherwise can add zero or more components on the left so compare RHS
383 * and if dns is longer and expect '.' as preceding character.
385 if (dns->length > base->length) {
386 dnsptr += dns->length - base->length;
387 if (*baseptr != '.' && dnsptr[-1] != '.')
388 return X509_V_ERR_PERMITTED_VIOLATION;
391 if (strcasecmp(baseptr, dnsptr))
392 return X509_V_ERR_PERMITTED_VIOLATION;
398 static int nc_email(ASN1_IA5STRING *eml, ASN1_IA5STRING *base)
400 const char *baseptr = (char *)base->data;
401 const char *emlptr = (char *)eml->data;
403 const char *baseat = strchr(baseptr, '@');
404 const char *emlat = strchr(emlptr, '@');
406 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
407 /* Special case: inital '.' is RHS match */
408 if (!baseat && (*baseptr == '.')) {
409 if (eml->length > base->length) {
410 emlptr += eml->length - base->length;
411 if (strcasecmp(baseptr, emlptr) == 0)
414 return X509_V_ERR_PERMITTED_VIOLATION;
417 /* If we have anything before '@' match local part */
420 if (baseat != baseptr) {
421 if ((baseat - baseptr) != (emlat - emlptr))
422 return X509_V_ERR_PERMITTED_VIOLATION;
423 /* Case sensitive match of local part */
424 if (strncmp(baseptr, emlptr, emlat - emlptr))
425 return X509_V_ERR_PERMITTED_VIOLATION;
427 /* Position base after '@' */
428 baseptr = baseat + 1;
431 /* Just have hostname left to match: case insensitive */
432 if (strcasecmp(baseptr, emlptr))
433 return X509_V_ERR_PERMITTED_VIOLATION;
439 static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base)
441 const char *baseptr = (char *)base->data;
442 const char *hostptr = (char *)uri->data;
443 const char *p = strchr(hostptr, ':');
445 /* Check for foo:// and skip past it */
446 if (!p || (p[1] != '/') || (p[2] != '/'))
447 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
450 /* Determine length of hostname part of URI */
452 /* Look for a port indicator as end of hostname first */
454 p = strchr(hostptr, ':');
455 /* Otherwise look for trailing slash */
457 p = strchr(hostptr, '/');
460 hostlen = strlen(hostptr);
462 hostlen = p - hostptr;
465 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
467 /* Special case: inital '.' is RHS match */
468 if (*baseptr == '.') {
469 if (hostlen > base->length) {
470 p = hostptr + hostlen - base->length;
471 if (strncasecmp(p, baseptr, base->length) == 0)
474 return X509_V_ERR_PERMITTED_VIOLATION;
477 if ((base->length != (int)hostlen)
478 || strncasecmp(hostptr, baseptr, hostlen))
479 return X509_V_ERR_PERMITTED_VIOLATION;
485 static int nc_ip(ASN1_OCTET_STRING *ip, ASN1_OCTET_STRING *base)
487 int hostlen, baselen, i;
488 unsigned char *hostptr, *baseptr, *maskptr;
490 hostlen = ip->length;
491 baseptr = base->data;
492 baselen = base->length;
494 /* Invalid if not IPv4 or IPv6 */
495 if (!((hostlen == 4) || (hostlen == 16)))
496 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
497 if (!((baselen == 8) || (baselen == 32)))
498 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
500 /* Do not match IPv4 with IPv6 */
501 if (hostlen * 2 != baselen)
502 return X509_V_ERR_PERMITTED_VIOLATION;
504 maskptr = base->data + hostlen;
506 /* Considering possible not aligned base ipAddress */
507 /* Not checking for wrong mask definition: i.e.: 255.0.255.0 */
508 for (i = 0; i < hostlen; i++)
509 if ((hostptr[i] & maskptr[i]) != (baseptr[i] & maskptr[i]))
510 return X509_V_ERR_PERMITTED_VIOLATION;