2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 2003 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).
60 #include "internal/cryptlib.h"
61 #include <openssl/asn1t.h>
62 #include <openssl/conf.h>
63 #include <openssl/x509v3.h>
65 #include "internal/x509_int.h"
68 static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
70 STACK_OF(CONF_VALUE) *nval);
71 static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, void *a,
73 static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
74 STACK_OF(GENERAL_SUBTREE) *trees, BIO *bp,
76 static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip);
78 static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc);
79 static int nc_match_single(GENERAL_NAME *sub, GENERAL_NAME *gen);
80 static int nc_dn(X509_NAME *sub, X509_NAME *nm);
81 static int nc_dns(ASN1_IA5STRING *sub, ASN1_IA5STRING *dns);
82 static int nc_email(ASN1_IA5STRING *sub, ASN1_IA5STRING *eml);
83 static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base);
84 static int nc_ip(ASN1_OCTET_STRING *ip, ASN1_OCTET_STRING *base);
86 const X509V3_EXT_METHOD v3_name_constraints = {
87 NID_name_constraints, 0,
88 ASN1_ITEM_ref(NAME_CONSTRAINTS),
91 0, v2i_NAME_CONSTRAINTS,
92 i2r_NAME_CONSTRAINTS, 0,
96 ASN1_SEQUENCE(GENERAL_SUBTREE) = {
97 ASN1_SIMPLE(GENERAL_SUBTREE, base, GENERAL_NAME),
98 ASN1_IMP_OPT(GENERAL_SUBTREE, minimum, ASN1_INTEGER, 0),
99 ASN1_IMP_OPT(GENERAL_SUBTREE, maximum, ASN1_INTEGER, 1)
100 } ASN1_SEQUENCE_END(GENERAL_SUBTREE)
102 ASN1_SEQUENCE(NAME_CONSTRAINTS) = {
103 ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, permittedSubtrees,
105 ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, excludedSubtrees,
107 } ASN1_SEQUENCE_END(NAME_CONSTRAINTS)
110 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(GENERAL_SUBTREE)
111 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(NAME_CONSTRAINTS)
113 static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
114 X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)
117 CONF_VALUE tval, *val;
118 STACK_OF(GENERAL_SUBTREE) **ptree = NULL;
119 NAME_CONSTRAINTS *ncons = NULL;
120 GENERAL_SUBTREE *sub = NULL;
122 ncons = NAME_CONSTRAINTS_new();
125 for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
126 val = sk_CONF_VALUE_value(nval, i);
127 if (strncmp(val->name, "permitted", 9) == 0 && val->name[9]) {
128 ptree = &ncons->permittedSubtrees;
129 tval.name = val->name + 10;
130 } else if (strncmp(val->name, "excluded", 8) == 0 && val->name[8]) {
131 ptree = &ncons->excludedSubtrees;
132 tval.name = val->name + 9;
134 X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, X509V3_R_INVALID_SYNTAX);
137 tval.value = val->value;
138 sub = GENERAL_SUBTREE_new();
141 if (!v2i_GENERAL_NAME_ex(sub->base, method, ctx, &tval, 1))
144 *ptree = sk_GENERAL_SUBTREE_new_null();
145 if (*ptree == NULL || !sk_GENERAL_SUBTREE_push(*ptree, sub))
153 X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, ERR_R_MALLOC_FAILURE);
155 NAME_CONSTRAINTS_free(ncons);
156 GENERAL_SUBTREE_free(sub);
161 static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, void *a,
164 NAME_CONSTRAINTS *ncons = a;
165 do_i2r_name_constraints(method, ncons->permittedSubtrees,
166 bp, ind, "Permitted");
167 do_i2r_name_constraints(method, ncons->excludedSubtrees,
168 bp, ind, "Excluded");
172 static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
173 STACK_OF(GENERAL_SUBTREE) *trees,
174 BIO *bp, int ind, char *name)
176 GENERAL_SUBTREE *tree;
178 if (sk_GENERAL_SUBTREE_num(trees) > 0)
179 BIO_printf(bp, "%*s%s:\n", ind, "", name);
180 for (i = 0; i < sk_GENERAL_SUBTREE_num(trees); i++) {
181 tree = sk_GENERAL_SUBTREE_value(trees, i);
182 BIO_printf(bp, "%*s", ind + 2, "");
183 if (tree->base->type == GEN_IPADD)
184 print_nc_ipadd(bp, tree->base->d.ip);
186 GENERAL_NAME_print(bp, tree->base);
192 static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip)
200 BIO_printf(bp, "%d.%d.%d.%d/%d.%d.%d.%d",
201 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
202 } else if (len == 32) {
203 for (i = 0; i < 16; i++) {
204 BIO_printf(bp, "%X", p[0] << 8 | p[1]);
212 BIO_printf(bp, "IP Address:<invalid>");
217 * Check a certificate conforms to a specified set of constraints.
219 * X509_V_OK: All constraints obeyed.
220 * X509_V_ERR_PERMITTED_VIOLATION: Permitted subtree violation.
221 * X509_V_ERR_EXCLUDED_VIOLATION: Excluded subtree violation.
222 * X509_V_ERR_SUBTREE_MINMAX: Min or max values present and matching type.
223 * X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE: Unsupported constraint type.
224 * X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: bad unsupported constraint syntax.
225 * X509_V_ERR_UNSUPPORTED_NAME_SYNTAX: bad or unsupported syntax of name
228 int NAME_CONSTRAINTS_check(X509 *x, NAME_CONSTRAINTS *nc)
233 nm = X509_get_subject_name(x);
235 if (X509_NAME_entry_count(nm) > 0) {
237 gntmp.type = GEN_DIRNAME;
238 gntmp.d.directoryName = nm;
240 r = nc_match(&gntmp, nc);
245 gntmp.type = GEN_EMAIL;
247 /* Process any email address attributes in subject name */
251 i = X509_NAME_get_index_by_NID(nm, NID_pkcs9_emailAddress, i);
254 ne = X509_NAME_get_entry(nm, i);
255 gntmp.d.rfc822Name = X509_NAME_ENTRY_get_data(ne);
256 if (gntmp.d.rfc822Name->type != V_ASN1_IA5STRING)
257 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
259 r = nc_match(&gntmp, nc);
267 for (i = 0; i < sk_GENERAL_NAME_num(x->altname); i++) {
268 GENERAL_NAME *gen = sk_GENERAL_NAME_value(x->altname, i);
269 r = nc_match(gen, nc);
278 static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc)
280 GENERAL_SUBTREE *sub;
284 * Permitted subtrees: if any subtrees exist of matching the type at
285 * least one subtree must match.
288 for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->permittedSubtrees); i++) {
289 sub = sk_GENERAL_SUBTREE_value(nc->permittedSubtrees, i);
290 if (gen->type != sub->base->type)
292 if (sub->minimum || sub->maximum)
293 return X509_V_ERR_SUBTREE_MINMAX;
294 /* If we already have a match don't bother trying any more */
299 r = nc_match_single(gen, sub->base);
302 else if (r != X509_V_ERR_PERMITTED_VIOLATION)
307 return X509_V_ERR_PERMITTED_VIOLATION;
309 /* Excluded subtrees: must not match any of these */
311 for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->excludedSubtrees); i++) {
312 sub = sk_GENERAL_SUBTREE_value(nc->excludedSubtrees, i);
313 if (gen->type != sub->base->type)
315 if (sub->minimum || sub->maximum)
316 return X509_V_ERR_SUBTREE_MINMAX;
318 r = nc_match_single(gen, sub->base);
320 return X509_V_ERR_EXCLUDED_VIOLATION;
321 else if (r != X509_V_ERR_PERMITTED_VIOLATION)
330 static int nc_match_single(GENERAL_NAME *gen, GENERAL_NAME *base)
332 switch (base->type) {
334 return nc_dn(gen->d.directoryName, base->d.directoryName);
337 return nc_dns(gen->d.dNSName, base->d.dNSName);
340 return nc_email(gen->d.rfc822Name, base->d.rfc822Name);
343 return nc_uri(gen->d.uniformResourceIdentifier,
344 base->d.uniformResourceIdentifier);
347 return nc_ip(gen->d.iPAddress, base->d.iPAddress);
350 return X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE;
356 * directoryName name constraint matching. The canonical encoding of
357 * X509_NAME makes this comparison easy. It is matched if the subtree is a
358 * subset of the name.
361 static int nc_dn(X509_NAME *nm, X509_NAME *base)
363 /* Ensure canonical encodings are up to date. */
364 if (nm->modified && i2d_X509_NAME(nm, NULL) < 0)
365 return X509_V_ERR_OUT_OF_MEM;
366 if (base->modified && i2d_X509_NAME(base, NULL) < 0)
367 return X509_V_ERR_OUT_OF_MEM;
368 if (base->canon_enclen > nm->canon_enclen)
369 return X509_V_ERR_PERMITTED_VIOLATION;
370 if (memcmp(base->canon_enc, nm->canon_enc, base->canon_enclen))
371 return X509_V_ERR_PERMITTED_VIOLATION;
375 static int nc_dns(ASN1_IA5STRING *dns, ASN1_IA5STRING *base)
377 char *baseptr = (char *)base->data;
378 char *dnsptr = (char *)dns->data;
379 /* Empty matches everything */
383 * Otherwise can add zero or more components on the left so compare RHS
384 * and if dns is longer and expect '.' as preceding character.
386 if (dns->length > base->length) {
387 dnsptr += dns->length - base->length;
388 if (*baseptr != '.' && dnsptr[-1] != '.')
389 return X509_V_ERR_PERMITTED_VIOLATION;
392 if (strcasecmp(baseptr, dnsptr))
393 return X509_V_ERR_PERMITTED_VIOLATION;
399 static int nc_email(ASN1_IA5STRING *eml, ASN1_IA5STRING *base)
401 const char *baseptr = (char *)base->data;
402 const char *emlptr = (char *)eml->data;
404 const char *baseat = strchr(baseptr, '@');
405 const char *emlat = strchr(emlptr, '@');
407 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
408 /* Special case: initial '.' is RHS match */
409 if (!baseat && (*baseptr == '.')) {
410 if (eml->length > base->length) {
411 emlptr += eml->length - base->length;
412 if (strcasecmp(baseptr, emlptr) == 0)
415 return X509_V_ERR_PERMITTED_VIOLATION;
418 /* If we have anything before '@' match local part */
421 if (baseat != baseptr) {
422 if ((baseat - baseptr) != (emlat - emlptr))
423 return X509_V_ERR_PERMITTED_VIOLATION;
424 /* Case sensitive match of local part */
425 if (strncmp(baseptr, emlptr, emlat - emlptr))
426 return X509_V_ERR_PERMITTED_VIOLATION;
428 /* Position base after '@' */
429 baseptr = baseat + 1;
432 /* Just have hostname left to match: case insensitive */
433 if (strcasecmp(baseptr, emlptr))
434 return X509_V_ERR_PERMITTED_VIOLATION;
440 static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base)
442 const char *baseptr = (char *)base->data;
443 const char *hostptr = (char *)uri->data;
444 const char *p = strchr(hostptr, ':');
446 /* Check for foo:// and skip past it */
447 if (!p || (p[1] != '/') || (p[2] != '/'))
448 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
451 /* Determine length of hostname part of URI */
453 /* Look for a port indicator as end of hostname first */
455 p = strchr(hostptr, ':');
456 /* Otherwise look for trailing slash */
458 p = strchr(hostptr, '/');
461 hostlen = strlen(hostptr);
463 hostlen = p - hostptr;
466 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
468 /* Special case: initial '.' is RHS match */
469 if (*baseptr == '.') {
470 if (hostlen > base->length) {
471 p = hostptr + hostlen - base->length;
472 if (strncasecmp(p, baseptr, base->length) == 0)
475 return X509_V_ERR_PERMITTED_VIOLATION;
478 if ((base->length != (int)hostlen)
479 || strncasecmp(hostptr, baseptr, hostlen))
480 return X509_V_ERR_PERMITTED_VIOLATION;
486 static int nc_ip(ASN1_OCTET_STRING *ip, ASN1_OCTET_STRING *base)
488 int hostlen, baselen, i;
489 unsigned char *hostptr, *baseptr, *maskptr;
491 hostlen = ip->length;
492 baseptr = base->data;
493 baselen = base->length;
495 /* Invalid if not IPv4 or IPv6 */
496 if (!((hostlen == 4) || (hostlen == 16)))
497 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
498 if (!((baselen == 8) || (baselen == 32)))
499 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
501 /* Do not match IPv4 with IPv6 */
502 if (hostlen * 2 != baselen)
503 return X509_V_ERR_PERMITTED_VIOLATION;
505 maskptr = base->data + hostlen;
507 /* Considering possible not aligned base ipAddress */
508 /* Not checking for wrong mask definition: i.e.: 255.0.255.0 */
509 for (i = 0; i < hostlen; i++)
510 if ((hostptr[i] & maskptr[i]) != (baseptr[i] & maskptr[i]))
511 return X509_V_ERR_PERMITTED_VIOLATION;