Line data Source code
1 : /* v3_ncons.c */
2 : /*
3 : * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
4 : * project.
5 : */
6 : /* ====================================================================
7 : * Copyright (c) 2003 The OpenSSL Project. All rights reserved.
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
14 : * notice, this list of conditions and the following disclaimer.
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>
61 : #include "cryptlib.h"
62 : #include <openssl/asn1t.h>
63 : #include <openssl/conf.h>
64 : #include <openssl/x509v3.h>
65 :
66 : static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
67 : X509V3_CTX *ctx,
68 : STACK_OF(CONF_VALUE) *nval);
69 : static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, void *a,
70 : BIO *bp, int ind);
71 : static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
72 : STACK_OF(GENERAL_SUBTREE) *trees, BIO *bp,
73 : int ind, char *name);
74 : static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip);
75 :
76 : static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc);
77 : static int nc_match_single(GENERAL_NAME *sub, GENERAL_NAME *gen);
78 : static int nc_dn(X509_NAME *sub, X509_NAME *nm);
79 : static int nc_dns(ASN1_IA5STRING *sub, ASN1_IA5STRING *dns);
80 : static int nc_email(ASN1_IA5STRING *sub, ASN1_IA5STRING *eml);
81 : static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base);
82 :
83 : const X509V3_EXT_METHOD v3_name_constraints = {
84 : NID_name_constraints, 0,
85 : ASN1_ITEM_ref(NAME_CONSTRAINTS),
86 : 0, 0, 0, 0,
87 : 0, 0,
88 : 0, v2i_NAME_CONSTRAINTS,
89 : i2r_NAME_CONSTRAINTS, 0,
90 : NULL
91 : };
92 :
93 : ASN1_SEQUENCE(GENERAL_SUBTREE) = {
94 : ASN1_SIMPLE(GENERAL_SUBTREE, base, GENERAL_NAME),
95 : ASN1_IMP_OPT(GENERAL_SUBTREE, minimum, ASN1_INTEGER, 0),
96 : ASN1_IMP_OPT(GENERAL_SUBTREE, maximum, ASN1_INTEGER, 1)
97 : } ASN1_SEQUENCE_END(GENERAL_SUBTREE)
98 :
99 : ASN1_SEQUENCE(NAME_CONSTRAINTS) = {
100 : ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, permittedSubtrees,
101 : GENERAL_SUBTREE, 0),
102 : ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, excludedSubtrees,
103 : GENERAL_SUBTREE, 1),
104 : } ASN1_SEQUENCE_END(NAME_CONSTRAINTS)
105 :
106 :
107 0 : IMPLEMENT_ASN1_ALLOC_FUNCTIONS(GENERAL_SUBTREE)
108 1681 : IMPLEMENT_ASN1_ALLOC_FUNCTIONS(NAME_CONSTRAINTS)
109 :
110 0 : static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
111 : X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)
112 : {
113 : int i;
114 : CONF_VALUE tval, *val;
115 : STACK_OF(GENERAL_SUBTREE) **ptree = NULL;
116 : NAME_CONSTRAINTS *ncons = NULL;
117 : GENERAL_SUBTREE *sub = NULL;
118 : ncons = NAME_CONSTRAINTS_new();
119 0 : if (!ncons)
120 : goto memerr;
121 0 : for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
122 0 : val = sk_CONF_VALUE_value(nval, i);
123 0 : if (!strncmp(val->name, "permitted", 9) && val->name[9]) {
124 0 : ptree = &ncons->permittedSubtrees;
125 0 : tval.name = val->name + 10;
126 0 : } else if (!strncmp(val->name, "excluded", 8) && val->name[8]) {
127 0 : ptree = &ncons->excludedSubtrees;
128 0 : tval.name = val->name + 9;
129 : } else {
130 0 : X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, X509V3_R_INVALID_SYNTAX);
131 0 : goto err;
132 : }
133 0 : tval.value = val->value;
134 : sub = GENERAL_SUBTREE_new();
135 0 : if (!v2i_GENERAL_NAME_ex(sub->base, method, ctx, &tval, 1))
136 : goto err;
137 0 : if (!*ptree)
138 0 : *ptree = sk_GENERAL_SUBTREE_new_null();
139 0 : if (!*ptree || !sk_GENERAL_SUBTREE_push(*ptree, sub))
140 : goto memerr;
141 : sub = NULL;
142 : }
143 :
144 : return ncons;
145 :
146 : memerr:
147 0 : X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, ERR_R_MALLOC_FAILURE);
148 : err:
149 0 : if (ncons)
150 : NAME_CONSTRAINTS_free(ncons);
151 0 : if (sub)
152 : GENERAL_SUBTREE_free(sub);
153 :
154 : return NULL;
155 : }
156 :
157 0 : static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, void *a,
158 : BIO *bp, int ind)
159 : {
160 : NAME_CONSTRAINTS *ncons = a;
161 0 : do_i2r_name_constraints(method, ncons->permittedSubtrees,
162 : bp, ind, "Permitted");
163 0 : do_i2r_name_constraints(method, ncons->excludedSubtrees,
164 : bp, ind, "Excluded");
165 0 : return 1;
166 : }
167 :
168 0 : static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
169 : STACK_OF(GENERAL_SUBTREE) *trees,
170 : BIO *bp, int ind, char *name)
171 : {
172 : GENERAL_SUBTREE *tree;
173 : int i;
174 0 : if (sk_GENERAL_SUBTREE_num(trees) > 0)
175 0 : BIO_printf(bp, "%*s%s:\n", ind, "", name);
176 0 : for (i = 0; i < sk_GENERAL_SUBTREE_num(trees); i++) {
177 0 : tree = sk_GENERAL_SUBTREE_value(trees, i);
178 0 : BIO_printf(bp, "%*s", ind + 2, "");
179 0 : if (tree->base->type == GEN_IPADD)
180 0 : print_nc_ipadd(bp, tree->base->d.ip);
181 : else
182 0 : GENERAL_NAME_print(bp, tree->base);
183 0 : BIO_puts(bp, "\n");
184 : }
185 0 : return 1;
186 : }
187 :
188 0 : static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip)
189 : {
190 : int i, len;
191 : unsigned char *p;
192 0 : p = ip->data;
193 0 : len = ip->length;
194 0 : BIO_puts(bp, "IP:");
195 0 : if (len == 8) {
196 0 : BIO_printf(bp, "%d.%d.%d.%d/%d.%d.%d.%d",
197 0 : p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
198 0 : } else if (len == 32) {
199 0 : for (i = 0; i < 16; i++) {
200 0 : BIO_printf(bp, "%X", p[0] << 8 | p[1]);
201 0 : p += 2;
202 0 : if (i == 7)
203 0 : BIO_puts(bp, "/");
204 0 : else if (i != 15)
205 0 : BIO_puts(bp, ":");
206 : }
207 : } else
208 0 : BIO_printf(bp, "IP Address:<invalid>");
209 0 : return 1;
210 : }
211 :
212 : /*-
213 : * Check a certificate conforms to a specified set of constraints.
214 : * Return values:
215 : * X509_V_OK: All constraints obeyed.
216 : * X509_V_ERR_PERMITTED_VIOLATION: Permitted subtree violation.
217 : * X509_V_ERR_EXCLUDED_VIOLATION: Excluded subtree violation.
218 : * X509_V_ERR_SUBTREE_MINMAX: Min or max values present and matching type.
219 : * X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE: Unsupported constraint type.
220 : * X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: bad unsupported constraint syntax.
221 : * X509_V_ERR_UNSUPPORTED_NAME_SYNTAX: bad or unsupported syntax of name
222 : */
223 :
224 0 : int NAME_CONSTRAINTS_check(X509 *x, NAME_CONSTRAINTS *nc)
225 : {
226 : int r, i;
227 : X509_NAME *nm;
228 :
229 0 : nm = X509_get_subject_name(x);
230 :
231 0 : if (X509_NAME_entry_count(nm) > 0) {
232 : GENERAL_NAME gntmp;
233 0 : gntmp.type = GEN_DIRNAME;
234 0 : gntmp.d.directoryName = nm;
235 :
236 0 : r = nc_match(&gntmp, nc);
237 :
238 0 : if (r != X509_V_OK)
239 0 : return r;
240 :
241 0 : gntmp.type = GEN_EMAIL;
242 :
243 : /* Process any email address attributes in subject name */
244 :
245 : for (i = -1;;) {
246 : X509_NAME_ENTRY *ne;
247 0 : i = X509_NAME_get_index_by_NID(nm, NID_pkcs9_emailAddress, i);
248 0 : if (i == -1)
249 : break;
250 0 : ne = X509_NAME_get_entry(nm, i);
251 0 : gntmp.d.rfc822Name = X509_NAME_ENTRY_get_data(ne);
252 0 : if (gntmp.d.rfc822Name->type != V_ASN1_IA5STRING)
253 : return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
254 :
255 0 : r = nc_match(&gntmp, nc);
256 :
257 0 : if (r != X509_V_OK)
258 : return r;
259 : }
260 :
261 : }
262 :
263 0 : for (i = 0; i < sk_GENERAL_NAME_num(x->altname); i++) {
264 0 : GENERAL_NAME *gen = sk_GENERAL_NAME_value(x->altname, i);
265 0 : r = nc_match(gen, nc);
266 0 : if (r != X509_V_OK)
267 : return r;
268 : }
269 :
270 : return X509_V_OK;
271 :
272 : }
273 :
274 0 : static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc)
275 : {
276 : GENERAL_SUBTREE *sub;
277 : int i, r, match = 0;
278 :
279 : /*
280 : * Permitted subtrees: if any subtrees exist of matching the type at
281 : * least one subtree must match.
282 : */
283 :
284 0 : for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->permittedSubtrees); i++) {
285 0 : sub = sk_GENERAL_SUBTREE_value(nc->permittedSubtrees, i);
286 0 : if (gen->type != sub->base->type)
287 0 : continue;
288 0 : if (sub->minimum || sub->maximum)
289 : return X509_V_ERR_SUBTREE_MINMAX;
290 : /* If we already have a match don't bother trying any more */
291 0 : if (match == 2)
292 0 : continue;
293 0 : if (match == 0)
294 : match = 1;
295 0 : r = nc_match_single(gen, sub->base);
296 0 : if (r == X509_V_OK)
297 : match = 2;
298 0 : else if (r != X509_V_ERR_PERMITTED_VIOLATION)
299 : return r;
300 : }
301 :
302 0 : if (match == 1)
303 : return X509_V_ERR_PERMITTED_VIOLATION;
304 :
305 : /* Excluded subtrees: must not match any of these */
306 :
307 0 : for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->excludedSubtrees); i++) {
308 0 : sub = sk_GENERAL_SUBTREE_value(nc->excludedSubtrees, i);
309 0 : if (gen->type != sub->base->type)
310 0 : continue;
311 0 : if (sub->minimum || sub->maximum)
312 : return X509_V_ERR_SUBTREE_MINMAX;
313 :
314 0 : r = nc_match_single(gen, sub->base);
315 0 : if (r == X509_V_OK)
316 : return X509_V_ERR_EXCLUDED_VIOLATION;
317 0 : else if (r != X509_V_ERR_PERMITTED_VIOLATION)
318 : return r;
319 :
320 : }
321 :
322 : return X509_V_OK;
323 :
324 : }
325 :
326 0 : static int nc_match_single(GENERAL_NAME *gen, GENERAL_NAME *base)
327 : {
328 0 : switch (base->type) {
329 : case GEN_DIRNAME:
330 0 : return nc_dn(gen->d.directoryName, base->d.directoryName);
331 :
332 : case GEN_DNS:
333 0 : return nc_dns(gen->d.dNSName, base->d.dNSName);
334 :
335 : case GEN_EMAIL:
336 0 : return nc_email(gen->d.rfc822Name, base->d.rfc822Name);
337 :
338 : case GEN_URI:
339 0 : return nc_uri(gen->d.uniformResourceIdentifier,
340 : base->d.uniformResourceIdentifier);
341 :
342 : default:
343 : return X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE;
344 : }
345 :
346 : }
347 :
348 : /*
349 : * directoryName name constraint matching. The canonical encoding of
350 : * X509_NAME makes this comparison easy. It is matched if the subtree is a
351 : * subset of the name.
352 : */
353 :
354 0 : static int nc_dn(X509_NAME *nm, X509_NAME *base)
355 : {
356 : /* Ensure canonical encodings are up to date. */
357 0 : if (nm->modified && i2d_X509_NAME(nm, NULL) < 0)
358 : return X509_V_ERR_OUT_OF_MEM;
359 0 : if (base->modified && i2d_X509_NAME(base, NULL) < 0)
360 : return X509_V_ERR_OUT_OF_MEM;
361 0 : if (base->canon_enclen > nm->canon_enclen)
362 : return X509_V_ERR_PERMITTED_VIOLATION;
363 0 : if (memcmp(base->canon_enc, nm->canon_enc, base->canon_enclen))
364 : return X509_V_ERR_PERMITTED_VIOLATION;
365 0 : return X509_V_OK;
366 : }
367 :
368 0 : static int nc_dns(ASN1_IA5STRING *dns, ASN1_IA5STRING *base)
369 : {
370 0 : char *baseptr = (char *)base->data;
371 0 : char *dnsptr = (char *)dns->data;
372 : /* Empty matches everything */
373 0 : if (!*baseptr)
374 : return X509_V_OK;
375 : /*
376 : * Otherwise can add zero or more components on the left so compare RHS
377 : * and if dns is longer and expect '.' as preceding character.
378 : */
379 0 : if (dns->length > base->length) {
380 0 : dnsptr += dns->length - base->length;
381 0 : if (*baseptr != '.' && dnsptr[-1] != '.')
382 : return X509_V_ERR_PERMITTED_VIOLATION;
383 : }
384 :
385 0 : if (strcasecmp(baseptr, dnsptr))
386 : return X509_V_ERR_PERMITTED_VIOLATION;
387 :
388 : return X509_V_OK;
389 :
390 : }
391 :
392 0 : static int nc_email(ASN1_IA5STRING *eml, ASN1_IA5STRING *base)
393 : {
394 0 : const char *baseptr = (char *)base->data;
395 0 : const char *emlptr = (char *)eml->data;
396 :
397 0 : const char *baseat = strchr(baseptr, '@');
398 0 : const char *emlat = strchr(emlptr, '@');
399 0 : if (!emlat)
400 : return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
401 : /* Special case: inital '.' is RHS match */
402 0 : if (!baseat && (*baseptr == '.')) {
403 0 : if (eml->length > base->length) {
404 0 : emlptr += eml->length - base->length;
405 0 : if (!strcasecmp(baseptr, emlptr))
406 : return X509_V_OK;
407 : }
408 : return X509_V_ERR_PERMITTED_VIOLATION;
409 : }
410 :
411 : /* If we have anything before '@' match local part */
412 :
413 0 : if (baseat) {
414 0 : if (baseat != baseptr) {
415 0 : if ((baseat - baseptr) != (emlat - emlptr))
416 : return X509_V_ERR_PERMITTED_VIOLATION;
417 : /* Case sensitive match of local part */
418 0 : if (strncmp(baseptr, emlptr, emlat - emlptr))
419 : return X509_V_ERR_PERMITTED_VIOLATION;
420 : }
421 : /* Position base after '@' */
422 0 : baseptr = baseat + 1;
423 : }
424 0 : emlptr = emlat + 1;
425 : /* Just have hostname left to match: case insensitive */
426 0 : if (strcasecmp(baseptr, emlptr))
427 : return X509_V_ERR_PERMITTED_VIOLATION;
428 :
429 : return X509_V_OK;
430 :
431 : }
432 :
433 0 : static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base)
434 : {
435 0 : const char *baseptr = (char *)base->data;
436 0 : const char *hostptr = (char *)uri->data;
437 0 : const char *p = strchr(hostptr, ':');
438 : int hostlen;
439 : /* Check for foo:// and skip past it */
440 0 : if (!p || (p[1] != '/') || (p[2] != '/'))
441 : return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
442 0 : hostptr = p + 3;
443 :
444 : /* Determine length of hostname part of URI */
445 :
446 : /* Look for a port indicator as end of hostname first */
447 :
448 0 : p = strchr(hostptr, ':');
449 : /* Otherwise look for trailing slash */
450 0 : if (!p)
451 0 : p = strchr(hostptr, '/');
452 :
453 0 : if (!p)
454 0 : hostlen = strlen(hostptr);
455 : else
456 0 : hostlen = p - hostptr;
457 :
458 0 : if (hostlen == 0)
459 : return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
460 :
461 : /* Special case: inital '.' is RHS match */
462 0 : if (*baseptr == '.') {
463 0 : if (hostlen > base->length) {
464 0 : p = hostptr + hostlen - base->length;
465 0 : if (!strncasecmp(p, baseptr, base->length))
466 : return X509_V_OK;
467 : }
468 : return X509_V_ERR_PERMITTED_VIOLATION;
469 : }
470 :
471 0 : if ((base->length != (int)hostlen)
472 0 : || strncasecmp(hostptr, baseptr, hostlen))
473 : return X509_V_ERR_PERMITTED_VIOLATION;
474 :
475 : return X509_V_OK;
476 :
477 : }
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