Update from stable branch.
[openssl.git] / crypto / x509v3 / v3_ncons.c
1 /* v3_ncons.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3  * project.
4  */
5 /* ====================================================================
6  * Copyright (c) 2003 The OpenSSL Project.  All rights reserved.
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
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, STACK_OF(CONF_VALUE) *nval);
68 static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, 
69                                 void *a, BIO *bp, int ind);
70 static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
71                                    STACK_OF(GENERAL_SUBTREE) *trees,
72                                    BIO *bp, int ind, char *name);
73 static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip);
74
75 static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc);
76 static int nc_match_single(GENERAL_NAME *sub, GENERAL_NAME *gen);
77 static int nc_dn(X509_NAME *sub, X509_NAME *nm);
78 static int nc_dns(ASN1_IA5STRING *sub, ASN1_IA5STRING *dns);
79 static int nc_email(ASN1_IA5STRING *sub, ASN1_IA5STRING *eml);
80 static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base);
81
82 const X509V3_EXT_METHOD v3_name_constraints = {
83         NID_name_constraints, 0,
84         ASN1_ITEM_ref(NAME_CONSTRAINTS),
85         0,0,0,0,
86         0,0,
87         0, v2i_NAME_CONSTRAINTS,
88         i2r_NAME_CONSTRAINTS,0,
89         NULL
90 };
91
92 ASN1_SEQUENCE(GENERAL_SUBTREE) = {
93         ASN1_SIMPLE(GENERAL_SUBTREE, base, GENERAL_NAME),
94         ASN1_IMP_OPT(GENERAL_SUBTREE, minimum, ASN1_INTEGER, 0),
95         ASN1_IMP_OPT(GENERAL_SUBTREE, maximum, ASN1_INTEGER, 1)
96 } ASN1_SEQUENCE_END(GENERAL_SUBTREE)
97
98 ASN1_SEQUENCE(NAME_CONSTRAINTS) = {
99         ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, permittedSubtrees,
100                                                         GENERAL_SUBTREE, 0),
101         ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, excludedSubtrees,
102                                                         GENERAL_SUBTREE, 1),
103 } ASN1_SEQUENCE_END(NAME_CONSTRAINTS)
104         
105
106 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(GENERAL_SUBTREE)
107 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(NAME_CONSTRAINTS)
108
109 static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
110                                   X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)
111         {
112         int i;
113         CONF_VALUE tval, *val;
114         STACK_OF(GENERAL_SUBTREE) **ptree = NULL;
115         NAME_CONSTRAINTS *ncons = NULL;
116         GENERAL_SUBTREE *sub = NULL;
117         ncons = NAME_CONSTRAINTS_new();
118         if (!ncons)
119                 goto memerr;
120         for(i = 0; i < sk_CONF_VALUE_num(nval); i++)
121                 {
122                 val = sk_CONF_VALUE_value(nval, i);
123                 if (!strncmp(val->name, "permitted", 9) && val->name[9])
124                         {
125                         ptree = &ncons->permittedSubtrees;
126                         tval.name = val->name + 10;
127                         }
128                 else if (!strncmp(val->name, "excluded", 8) && val->name[8])
129                         {
130                         ptree = &ncons->excludedSubtrees;
131                         tval.name = val->name + 9;
132                         }
133                 else
134                         {
135                         X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, X509V3_R_INVALID_SYNTAX);
136                         goto err;
137                         }
138                 tval.value = val->value;
139                 sub = GENERAL_SUBTREE_new();
140                 if (!v2i_GENERAL_NAME_ex(sub->base, method, ctx, &tval, 1))
141                         goto err;
142                 if (!*ptree)
143                         *ptree = sk_GENERAL_SUBTREE_new_null();
144                 if (!*ptree || !sk_GENERAL_SUBTREE_push(*ptree, sub))
145                         goto memerr;
146                 sub = NULL;
147                 }
148
149         return ncons;
150
151         memerr:
152         X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, ERR_R_MALLOC_FAILURE);
153         err:
154         if (ncons)
155                 NAME_CONSTRAINTS_free(ncons);
156         if (sub)
157                 GENERAL_SUBTREE_free(sub);
158
159         return NULL;
160         }
161                         
162
163         
164
165 static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, void *a,
166                                 BIO *bp, int ind)
167         {
168         NAME_CONSTRAINTS *ncons = a;
169         do_i2r_name_constraints(method, ncons->permittedSubtrees,
170                                         bp, ind, "Permitted");
171         do_i2r_name_constraints(method, ncons->excludedSubtrees,
172                                         bp, ind, "Excluded");
173         return 1;
174         }
175
176 static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
177                                    STACK_OF(GENERAL_SUBTREE) *trees,
178                                    BIO *bp, int ind, char *name)
179         {
180         GENERAL_SUBTREE *tree;
181         int i;
182         if (sk_GENERAL_SUBTREE_num(trees) > 0)
183                 BIO_printf(bp, "%*s%s:\n", ind, "", name);
184         for(i = 0; i < sk_GENERAL_SUBTREE_num(trees); i++)
185                 {
186                 tree = sk_GENERAL_SUBTREE_value(trees, i);
187                 BIO_printf(bp, "%*s", ind + 2, "");
188                 if (tree->base->type == GEN_IPADD)
189                         print_nc_ipadd(bp, tree->base->d.ip);
190                 else
191                         GENERAL_NAME_print(bp, tree->base);
192                 tree = sk_GENERAL_SUBTREE_value(trees, i);
193                 BIO_puts(bp, "\n");
194                 }
195         return 1;
196         }
197
198 static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip)
199         {
200         int i, len;
201         unsigned char *p;
202         p = ip->data;
203         len = ip->length;
204         BIO_puts(bp, "IP:");
205         if(len == 8)
206                 {
207                 BIO_printf(bp, "%d.%d.%d.%d/%d.%d.%d.%d",
208                                 p[0], p[1], p[2], p[3],
209                                 p[4], p[5], p[6], p[7]);
210                 }
211         else if(len == 32)
212                 {
213                 for (i = 0; i < 16; i++)
214                         {
215                         BIO_printf(bp, "%X", p[0] << 8 | p[1]);
216                         p += 2;
217                         if (i == 7)
218                                 BIO_puts(bp, "/");
219                         else if (i != 15)
220                                 BIO_puts(bp, ":");
221                         }
222                 }
223         else
224                 BIO_printf(bp, "IP Address:<invalid>");
225         return 1;
226         }
227
228 /* Check a certificate conforms to a specified set of constraints.
229  * Return values:
230  *  X509_V_OK: All constraints obeyed.
231  *  X509_V_ERR_PERMITTED_VIOLATION: Permitted subtree violation.
232  *  X509_V_ERR_EXCLUDED_VIOLATION: Excluded subtree violation.
233  *  X509_V_ERR_SUBTREE_MINMAX: Min or max values present and matching type.
234  *  X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE:  Unsupported constraint type.
235  *  X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: bad unsupported constraint syntax.
236  *  X509_V_ERR_UNSUPPORTED_NAME_SYNTAX: bad or unsupported syntax of name
237
238  */
239
240 int NAME_CONSTRAINTS_check(X509 *x, NAME_CONSTRAINTS *nc)
241         {
242         int r, i;
243         X509_NAME *nm;
244
245         nm = X509_get_subject_name(x);
246
247         if (X509_NAME_entry_count(nm) > 0)
248                 {
249                 GENERAL_NAME gntmp;
250                 gntmp.type = GEN_DIRNAME;
251                 gntmp.d.directoryName = nm;
252
253                 r = nc_match(&gntmp, nc);
254
255                 if (r != X509_V_OK)
256                         return r;
257
258                 gntmp.type = GEN_EMAIL;
259
260
261                 /* Process any email address attributes in subject name */
262
263                 for (i = -1;;)
264                         {
265                         X509_NAME_ENTRY *ne;
266                         i = X509_NAME_get_index_by_NID(nm,
267                                                        NID_pkcs9_emailAddress,
268                                                        i);
269                         if (i == -1)
270                                 break;
271                         ne = X509_NAME_get_entry(nm, i);
272                         gntmp.d.rfc822Name = X509_NAME_ENTRY_get_data(ne);
273                         if (gntmp.d.rfc822Name->type != V_ASN1_IA5STRING)
274                                 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
275
276                         r = nc_match(&gntmp, nc);
277
278                         if (r != X509_V_OK)
279                                 return r;
280                         }
281                 
282                 }
283
284         for (i = 0; i < sk_GENERAL_NAME_num(x->altname); i++)
285                 {
286                 GENERAL_NAME *gen = sk_GENERAL_NAME_value(x->altname, i);
287                 r = nc_match(gen, nc);
288                 if (r != X509_V_OK)
289                         return r;
290                 }
291
292         return X509_V_OK;
293
294         }
295
296 static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc)
297         {
298         GENERAL_SUBTREE *sub;
299         int i, r, match = 0;
300
301         /* Permitted subtrees: if any subtrees exist of matching the type
302          * at least one subtree must match.
303          */
304
305         for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->permittedSubtrees); i++)
306                 {
307                 sub = sk_GENERAL_SUBTREE_value(nc->permittedSubtrees, i);
308                 if (gen->type != sub->base->type)
309                         continue;
310                 if (sub->minimum || sub->maximum)
311                         return X509_V_ERR_SUBTREE_MINMAX;
312                 /* If we already have a match don't bother trying any more */
313                 if (match == 2)
314                         continue;
315                 if (match == 0)
316                         match = 1;
317                 r = nc_match_single(gen, sub->base);
318                 if (r == X509_V_OK)
319                         match = 2;
320                 else if (r != X509_V_ERR_PERMITTED_VIOLATION)
321                         return r;
322                 }
323
324         if (match == 1)
325                 return X509_V_ERR_PERMITTED_VIOLATION;
326
327         /* Excluded subtrees: must not match any of these */
328
329         for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->excludedSubtrees); i++)
330                 {
331                 sub = sk_GENERAL_SUBTREE_value(nc->excludedSubtrees, i);
332                 if (gen->type != sub->base->type)
333                         continue;
334                 if (sub->minimum || sub->maximum)
335                         return X509_V_ERR_SUBTREE_MINMAX;
336
337                 r = nc_match_single(gen, sub->base);
338                 if (r == X509_V_OK)
339                         return X509_V_ERR_EXCLUDED_VIOLATION;
340                 else if (r != X509_V_ERR_PERMITTED_VIOLATION)
341                         return r;
342
343                 }
344
345         return X509_V_OK;
346
347         }
348
349 static int nc_match_single(GENERAL_NAME *gen, GENERAL_NAME *base)
350         {
351         switch(base->type)
352                 {
353                 case GEN_DIRNAME:
354                 return nc_dn(gen->d.directoryName, base->d.directoryName);
355
356                 case GEN_DNS:
357                 return nc_dns(gen->d.dNSName, base->d.dNSName);
358
359                 case GEN_EMAIL:
360                 return nc_email(gen->d.rfc822Name, base->d.rfc822Name);
361
362                 case GEN_URI:
363                 return nc_uri(gen->d.uniformResourceIdentifier,
364                                         base->d.uniformResourceIdentifier);
365
366                 default:
367                 return X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE;
368                 }
369
370         }
371
372 /* directoryName name constraint matching.
373  * The canonical encoding of X509_NAME makes this comparison easy. It is
374  * matched if the subtree is a subset of the name.
375  */
376
377 static int nc_dn(X509_NAME *nm, X509_NAME *base)
378         {
379         if (base->canon_enclen > nm->canon_enclen)
380                 return X509_V_ERR_PERMITTED_VIOLATION;
381         if (memcmp(base->canon_enc, nm->canon_enc, base->canon_enclen))
382                 return X509_V_ERR_PERMITTED_VIOLATION;
383         return X509_V_OK;
384         }
385
386 static int nc_dns(ASN1_IA5STRING *dns, ASN1_IA5STRING *base)
387         {
388         char *baseptr = (char *)base->data;
389         char *dnsptr = (char *)dns->data;
390         /* Empty matches everything */
391         if (!*baseptr)
392                 return X509_V_OK;
393         /* Otherwise can add zero or more components on the left so
394          * compare RHS and if dns is longer and expect '.' as preceding
395          * character.
396          */
397         if (dns->length > base->length)
398                 {
399                 dnsptr += dns->length - base->length;
400                 if (dnsptr[-1] != '.')
401                         return X509_V_ERR_PERMITTED_VIOLATION;
402                 }
403
404         if (strcasecmp(baseptr, dnsptr))
405                         return X509_V_ERR_PERMITTED_VIOLATION;
406
407         return X509_V_OK;
408
409         }
410
411 static int nc_email(ASN1_IA5STRING *eml, ASN1_IA5STRING *base)
412         {
413         const char *baseptr = (char *)base->data;
414         const char *emlptr = (char *)eml->data;
415
416         const char *baseat = strchr(baseptr, '@');
417         const char *emlat = strchr(emlptr, '@');
418         if (!emlat)
419                 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
420         /* Special case: inital '.' is RHS match */
421         if (!baseat && (*baseptr == '.'))
422                 {
423                 if (eml->length > base->length)
424                         {
425                         emlptr += eml->length - base->length;
426                         if (!strcasecmp(baseptr, emlptr))
427                                 return X509_V_OK;
428                         }
429                 return X509_V_ERR_PERMITTED_VIOLATION;
430                 }
431
432         /* If we have anything before '@' match local part */
433
434         if (baseat)
435                 {
436                 if (baseat != baseptr)
437                         {
438                         if ((baseat - baseptr) != (emlat - emlptr))
439                                 return X509_V_ERR_PERMITTED_VIOLATION;
440                         /* Case sensitive match of local part */
441                         if (strncmp(baseptr, emlptr, emlat - emlptr))
442                                 return X509_V_ERR_PERMITTED_VIOLATION;
443                         }
444                 /* Position base after '@' */
445                 baseptr = baseat + 1;
446                 }
447         emlptr = emlat + 1;
448         /* Just have hostname left to match: case insensitive */
449         if (strcasecmp(baseptr, emlptr))
450                 return X509_V_ERR_PERMITTED_VIOLATION;
451
452         return X509_V_OK;
453
454         }
455
456 static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base)
457         {
458         const char *baseptr = (char *)base->data;
459         const char *hostptr = (char *)uri->data;
460         const char *p = strchr(hostptr, ':');
461         int hostlen;
462         /* Check for foo:// and skip past it */
463         if (!p || (p[1] != '/') || (p[2] != '/'))
464                 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
465         hostptr = p + 3;
466
467         /* Determine length of hostname part of URI */
468
469         /* Look for a port indicator as end of hostname first */
470
471         p = strchr(hostptr, ':');
472         /* Otherwise look for trailing slash */
473         if (!p)
474                 p = strchr(hostptr, '/');
475
476         if (!p)
477                 hostlen = strlen(hostptr);
478         else
479                 hostlen = p - hostptr;
480
481         if (hostlen == 0)
482                 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
483
484         /* Special case: inital '.' is RHS match */
485         if (*baseptr == '.')
486                 {
487                 if (hostlen > base->length)
488                         {
489                         p = hostptr + hostlen - base->length;
490                         if (!strncasecmp(p, baseptr, base->length))
491                                 return X509_V_OK;
492                         }
493                 return X509_V_ERR_PERMITTED_VIOLATION;
494                 }
495
496         if ((base->length != (int)hostlen) || strncasecmp(hostptr, baseptr, hostlen))
497                 return X509_V_ERR_PERMITTED_VIOLATION;
498
499         return X509_V_OK;
500
501         }