PPC assembly pack update addendum.
[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                 BIO_puts(bp, "\n");
193                 }
194         return 1;
195         }
196
197 static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip)
198         {
199         int i, len;
200         unsigned char *p;
201         p = ip->data;
202         len = ip->length;
203         BIO_puts(bp, "IP:");
204         if(len == 8)
205                 {
206                 BIO_printf(bp, "%d.%d.%d.%d/%d.%d.%d.%d",
207                                 p[0], p[1], p[2], p[3],
208                                 p[4], p[5], p[6], p[7]);
209                 }
210         else if(len == 32)
211                 {
212                 for (i = 0; i < 16; i++)
213                         {
214                         BIO_printf(bp, "%X", p[0] << 8 | p[1]);
215                         p += 2;
216                         if (i == 7)
217                                 BIO_puts(bp, "/");
218                         else if (i != 15)
219                                 BIO_puts(bp, ":");
220                         }
221                 }
222         else
223                 BIO_printf(bp, "IP Address:<invalid>");
224         return 1;
225         }
226
227 /* Check a certificate conforms to a specified set of constraints.
228  * Return values:
229  *  X509_V_OK: All constraints obeyed.
230  *  X509_V_ERR_PERMITTED_VIOLATION: Permitted subtree violation.
231  *  X509_V_ERR_EXCLUDED_VIOLATION: Excluded subtree violation.
232  *  X509_V_ERR_SUBTREE_MINMAX: Min or max values present and matching type.
233  *  X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE:  Unsupported constraint type.
234  *  X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: bad unsupported constraint syntax.
235  *  X509_V_ERR_UNSUPPORTED_NAME_SYNTAX: bad or unsupported syntax of name
236
237  */
238
239 int NAME_CONSTRAINTS_check(X509 *x, NAME_CONSTRAINTS *nc)
240         {
241         int r, i;
242         X509_NAME *nm;
243
244         nm = X509_get_subject_name(x);
245
246         if (X509_NAME_entry_count(nm) > 0)
247                 {
248                 GENERAL_NAME gntmp;
249                 gntmp.type = GEN_DIRNAME;
250                 gntmp.d.directoryName = nm;
251
252                 r = nc_match(&gntmp, nc);
253
254                 if (r != X509_V_OK)
255                         return r;
256
257                 gntmp.type = GEN_EMAIL;
258
259
260                 /* Process any email address attributes in subject name */
261
262                 for (i = -1;;)
263                         {
264                         X509_NAME_ENTRY *ne;
265                         i = X509_NAME_get_index_by_NID(nm,
266                                                        NID_pkcs9_emailAddress,
267                                                        i);
268                         if (i == -1)
269                                 break;
270                         ne = X509_NAME_get_entry(nm, i);
271                         gntmp.d.rfc822Name = X509_NAME_ENTRY_get_data(ne);
272                         if (gntmp.d.rfc822Name->type != V_ASN1_IA5STRING)
273                                 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
274
275                         r = nc_match(&gntmp, nc);
276
277                         if (r != X509_V_OK)
278                                 return r;
279                         }
280                 
281                 }
282
283         for (i = 0; i < sk_GENERAL_NAME_num(x->altname); i++)
284                 {
285                 GENERAL_NAME *gen = sk_GENERAL_NAME_value(x->altname, i);
286                 r = nc_match(gen, nc);
287                 if (r != X509_V_OK)
288                         return r;
289                 }
290
291         return X509_V_OK;
292
293         }
294
295 static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc)
296         {
297         GENERAL_SUBTREE *sub;
298         int i, r, match = 0;
299
300         /* Permitted subtrees: if any subtrees exist of matching the type
301          * at least one subtree must match.
302          */
303
304         for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->permittedSubtrees); i++)
305                 {
306                 sub = sk_GENERAL_SUBTREE_value(nc->permittedSubtrees, i);
307                 if (gen->type != sub->base->type)
308                         continue;
309                 if (sub->minimum || sub->maximum)
310                         return X509_V_ERR_SUBTREE_MINMAX;
311                 /* If we already have a match don't bother trying any more */
312                 if (match == 2)
313                         continue;
314                 if (match == 0)
315                         match = 1;
316                 r = nc_match_single(gen, sub->base);
317                 if (r == X509_V_OK)
318                         match = 2;
319                 else if (r != X509_V_ERR_PERMITTED_VIOLATION)
320                         return r;
321                 }
322
323         if (match == 1)
324                 return X509_V_ERR_PERMITTED_VIOLATION;
325
326         /* Excluded subtrees: must not match any of these */
327
328         for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->excludedSubtrees); i++)
329                 {
330                 sub = sk_GENERAL_SUBTREE_value(nc->excludedSubtrees, i);
331                 if (gen->type != sub->base->type)
332                         continue;
333                 if (sub->minimum || sub->maximum)
334                         return X509_V_ERR_SUBTREE_MINMAX;
335
336                 r = nc_match_single(gen, sub->base);
337                 if (r == X509_V_OK)
338                         return X509_V_ERR_EXCLUDED_VIOLATION;
339                 else if (r != X509_V_ERR_PERMITTED_VIOLATION)
340                         return r;
341
342                 }
343
344         return X509_V_OK;
345
346         }
347
348 static int nc_match_single(GENERAL_NAME *gen, GENERAL_NAME *base)
349         {
350         switch(base->type)
351                 {
352                 case GEN_DIRNAME:
353                 return nc_dn(gen->d.directoryName, base->d.directoryName);
354
355                 case GEN_DNS:
356                 return nc_dns(gen->d.dNSName, base->d.dNSName);
357
358                 case GEN_EMAIL:
359                 return nc_email(gen->d.rfc822Name, base->d.rfc822Name);
360
361                 case GEN_URI:
362                 return nc_uri(gen->d.uniformResourceIdentifier,
363                                         base->d.uniformResourceIdentifier);
364
365                 default:
366                 return X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE;
367                 }
368
369         }
370
371 /* directoryName name constraint matching.
372  * The canonical encoding of X509_NAME makes this comparison easy. It is
373  * matched if the subtree is a subset of the name.
374  */
375
376 static int nc_dn(X509_NAME *nm, X509_NAME *base)
377         {
378         /* Ensure canonical encodings are up to date.  */
379         if (nm->modified && i2d_X509_NAME(nm, NULL) < 0)
380                 return X509_V_ERR_OUT_OF_MEM;
381         if (base->modified && i2d_X509_NAME(base, NULL) < 0)
382                 return X509_V_ERR_OUT_OF_MEM;
383         if (base->canon_enclen > nm->canon_enclen)
384                 return X509_V_ERR_PERMITTED_VIOLATION;
385         if (memcmp(base->canon_enc, nm->canon_enc, base->canon_enclen))
386                 return X509_V_ERR_PERMITTED_VIOLATION;
387         return X509_V_OK;
388         }
389
390 static int nc_dns(ASN1_IA5STRING *dns, ASN1_IA5STRING *base)
391         {
392         char *baseptr = (char *)base->data;
393         char *dnsptr = (char *)dns->data;
394         /* Empty matches everything */
395         if (!*baseptr)
396                 return X509_V_OK;
397         /* Otherwise can add zero or more components on the left so
398          * compare RHS and if dns is longer and expect '.' as preceding
399          * character.
400          */
401         if (dns->length > base->length)
402                 {
403                 dnsptr += dns->length - base->length;
404                 if (dnsptr[-1] != '.')
405                         return X509_V_ERR_PERMITTED_VIOLATION;
406                 }
407
408         if (strcasecmp(baseptr, dnsptr))
409                         return X509_V_ERR_PERMITTED_VIOLATION;
410
411         return X509_V_OK;
412
413         }
414
415 static int nc_email(ASN1_IA5STRING *eml, ASN1_IA5STRING *base)
416         {
417         const char *baseptr = (char *)base->data;
418         const char *emlptr = (char *)eml->data;
419
420         const char *baseat = strchr(baseptr, '@');
421         const char *emlat = strchr(emlptr, '@');
422         if (!emlat)
423                 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
424         /* Special case: inital '.' is RHS match */
425         if (!baseat && (*baseptr == '.'))
426                 {
427                 if (eml->length > base->length)
428                         {
429                         emlptr += eml->length - base->length;
430                         if (!strcasecmp(baseptr, emlptr))
431                                 return X509_V_OK;
432                         }
433                 return X509_V_ERR_PERMITTED_VIOLATION;
434                 }
435
436         /* If we have anything before '@' match local part */
437
438         if (baseat)
439                 {
440                 if (baseat != baseptr)
441                         {
442                         if ((baseat - baseptr) != (emlat - emlptr))
443                                 return X509_V_ERR_PERMITTED_VIOLATION;
444                         /* Case sensitive match of local part */
445                         if (strncmp(baseptr, emlptr, emlat - emlptr))
446                                 return X509_V_ERR_PERMITTED_VIOLATION;
447                         }
448                 /* Position base after '@' */
449                 baseptr = baseat + 1;
450                 }
451         emlptr = emlat + 1;
452         /* Just have hostname left to match: case insensitive */
453         if (strcasecmp(baseptr, emlptr))
454                 return X509_V_ERR_PERMITTED_VIOLATION;
455
456         return X509_V_OK;
457
458         }
459
460 static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base)
461         {
462         const char *baseptr = (char *)base->data;
463         const char *hostptr = (char *)uri->data;
464         const char *p = strchr(hostptr, ':');
465         int hostlen;
466         /* Check for foo:// and skip past it */
467         if (!p || (p[1] != '/') || (p[2] != '/'))
468                 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
469         hostptr = p + 3;
470
471         /* Determine length of hostname part of URI */
472
473         /* Look for a port indicator as end of hostname first */
474
475         p = strchr(hostptr, ':');
476         /* Otherwise look for trailing slash */
477         if (!p)
478                 p = strchr(hostptr, '/');
479
480         if (!p)
481                 hostlen = strlen(hostptr);
482         else
483                 hostlen = p - hostptr;
484
485         if (hostlen == 0)
486                 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
487
488         /* Special case: inital '.' is RHS match */
489         if (*baseptr == '.')
490                 {
491                 if (hostlen > base->length)
492                         {
493                         p = hostptr + hostlen - base->length;
494                         if (!strncasecmp(p, baseptr, base->length))
495                                 return X509_V_OK;
496                         }
497                 return X509_V_ERR_PERMITTED_VIOLATION;
498                 }
499
500         if ((base->length != (int)hostlen) || strncasecmp(hostptr, baseptr, hostlen))
501                 return X509_V_ERR_PERMITTED_VIOLATION;
502
503         return X509_V_OK;
504
505         }