1 /* $NetBSD: ext.c,v 1.1.1.2 2014/04/24 12:45:28 pettai Exp $ */
2
3 /*
4 * Copyright (c) 2004 - 2005 Kungliga Tekniska Högskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * 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 the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include "hdb_locl.h"
37 #include <krb5/der.h>
38
39 krb5_error_code
hdb_entry_check_mandatory(krb5_context context,const hdb_entry * ent)40 hdb_entry_check_mandatory(krb5_context context, const hdb_entry *ent)
41 {
42 size_t i;
43
44 if (ent->extensions == NULL)
45 return 0;
46
47 /*
48 * check for unknown extensions and if they where tagged mandatory
49 */
50
51 for (i = 0; i < ent->extensions->len; i++) {
52 if (ent->extensions->val[i].data.element !=
53 choice_HDB_extension_data_asn1_ellipsis)
54 continue;
55 if (ent->extensions->val[i].mandatory) {
56 krb5_set_error_message(context, HDB_ERR_MANDATORY_OPTION,
57 "Principal have unknown "
58 "mandatory extension");
59 return HDB_ERR_MANDATORY_OPTION;
60 }
61 }
62 return 0;
63 }
64
65 HDB_extension *
hdb_find_extension(const hdb_entry * entry,int type)66 hdb_find_extension(const hdb_entry *entry, int type)
67 {
68 size_t i;
69
70 if (entry->extensions == NULL)
71 return NULL;
72
73 for (i = 0; i < entry->extensions->len; i++)
74 if (entry->extensions->val[i].data.element == (unsigned)type)
75 return &entry->extensions->val[i];
76 return NULL;
77 }
78
79 /*
80 * Replace the extension `ext' in `entry'. Make a copy of the
81 * extension, so the caller must still free `ext' on both success and
82 * failure. Returns 0 or error code.
83 */
84
85 krb5_error_code
hdb_replace_extension(krb5_context context,hdb_entry * entry,const HDB_extension * ext)86 hdb_replace_extension(krb5_context context,
87 hdb_entry *entry,
88 const HDB_extension *ext)
89 {
90 HDB_extension *ext2;
91 HDB_extension *es;
92 int ret;
93
94 ext2 = NULL;
95
96 if (entry->extensions == NULL) {
97 entry->extensions = calloc(1, sizeof(*entry->extensions));
98 if (entry->extensions == NULL) {
99 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
100 return ENOMEM;
101 }
102 } else if (ext->data.element != choice_HDB_extension_data_asn1_ellipsis) {
103 ext2 = hdb_find_extension(entry, ext->data.element);
104 } else {
105 /*
106 * This is an unknown extention, and we are asked to replace a
107 * possible entry in `entry' that is of the same type. This
108 * might seem impossible, but ASN.1 CHOICE comes to our
109 * rescue. The first tag in each branch in the CHOICE is
110 * unique, so just find the element in the list that have the
111 * same tag was we are putting into the list.
112 */
113 Der_class replace_class, list_class;
114 Der_type replace_type, list_type;
115 unsigned int replace_tag, list_tag;
116 size_t size;
117 size_t i;
118
119 ret = der_get_tag(ext->data.u.asn1_ellipsis.data,
120 ext->data.u.asn1_ellipsis.length,
121 &replace_class, &replace_type, &replace_tag,
122 &size);
123 if (ret) {
124 krb5_set_error_message(context, ret, "hdb: failed to decode "
125 "replacement hdb extention");
126 return ret;
127 }
128
129 for (i = 0; i < entry->extensions->len; i++) {
130 HDB_extension *ext3 = &entry->extensions->val[i];
131
132 if (ext3->data.element != choice_HDB_extension_data_asn1_ellipsis)
133 continue;
134
135 ret = der_get_tag(ext3->data.u.asn1_ellipsis.data,
136 ext3->data.u.asn1_ellipsis.length,
137 &list_class, &list_type, &list_tag,
138 &size);
139 if (ret) {
140 krb5_set_error_message(context, ret, "hdb: failed to decode "
141 "present hdb extention");
142 return ret;
143 }
144
145 if (MAKE_TAG(replace_class,replace_type,replace_type) ==
146 MAKE_TAG(list_class,list_type,list_type)) {
147 ext2 = ext3;
148 break;
149 }
150 }
151 }
152
153 if (ext2) {
154 free_HDB_extension(ext2);
155 ret = copy_HDB_extension(ext, ext2);
156 if (ret)
157 krb5_set_error_message(context, ret, "hdb: failed to copy replacement "
158 "hdb extention");
159 return ret;
160 }
161
162 es = realloc(entry->extensions->val,
163 (entry->extensions->len+1)*sizeof(entry->extensions->val[0]));
164 if (es == NULL) {
165 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
166 return ENOMEM;
167 }
168 entry->extensions->val = es;
169
170 ret = copy_HDB_extension(ext,
171 &entry->extensions->val[entry->extensions->len]);
172 if (ret == 0)
173 entry->extensions->len++;
174 else
175 krb5_set_error_message(context, ret, "hdb: failed to copy new extension");
176
177 return ret;
178 }
179
180 krb5_error_code
hdb_clear_extension(krb5_context context,hdb_entry * entry,int type)181 hdb_clear_extension(krb5_context context,
182 hdb_entry *entry,
183 int type)
184 {
185 size_t i;
186
187 if (entry->extensions == NULL)
188 return 0;
189
190 for (i = 0; i < entry->extensions->len; i++) {
191 if (entry->extensions->val[i].data.element == (unsigned)type) {
192 free_HDB_extension(&entry->extensions->val[i]);
193 memmove(&entry->extensions->val[i],
194 &entry->extensions->val[i + 1],
195 sizeof(entry->extensions->val[i]) * (entry->extensions->len - i - 1));
196 entry->extensions->len--;
197 }
198 }
199 if (entry->extensions->len == 0) {
200 free(entry->extensions->val);
201 free(entry->extensions);
202 entry->extensions = NULL;
203 }
204
205 return 0;
206 }
207
208
209 krb5_error_code
hdb_entry_get_pkinit_acl(const hdb_entry * entry,const HDB_Ext_PKINIT_acl ** a)210 hdb_entry_get_pkinit_acl(const hdb_entry *entry, const HDB_Ext_PKINIT_acl **a)
211 {
212 const HDB_extension *ext;
213
214 ext = hdb_find_extension(entry, choice_HDB_extension_data_pkinit_acl);
215 if (ext)
216 *a = &ext->data.u.pkinit_acl;
217 else
218 *a = NULL;
219
220 return 0;
221 }
222
223 krb5_error_code
hdb_entry_get_pkinit_hash(const hdb_entry * entry,const HDB_Ext_PKINIT_hash ** a)224 hdb_entry_get_pkinit_hash(const hdb_entry *entry, const HDB_Ext_PKINIT_hash **a)
225 {
226 const HDB_extension *ext;
227
228 ext = hdb_find_extension(entry, choice_HDB_extension_data_pkinit_cert_hash);
229 if (ext)
230 *a = &ext->data.u.pkinit_cert_hash;
231 else
232 *a = NULL;
233
234 return 0;
235 }
236
237 krb5_error_code
hdb_entry_get_pkinit_cert(const hdb_entry * entry,const HDB_Ext_PKINIT_cert ** a)238 hdb_entry_get_pkinit_cert(const hdb_entry *entry, const HDB_Ext_PKINIT_cert **a)
239 {
240 const HDB_extension *ext;
241
242 ext = hdb_find_extension(entry, choice_HDB_extension_data_pkinit_cert);
243 if (ext)
244 *a = &ext->data.u.pkinit_cert;
245 else
246 *a = NULL;
247
248 return 0;
249 }
250
251 krb5_error_code
hdb_entry_get_pw_change_time(const hdb_entry * entry,time_t * t)252 hdb_entry_get_pw_change_time(const hdb_entry *entry, time_t *t)
253 {
254 const HDB_extension *ext;
255
256 ext = hdb_find_extension(entry, choice_HDB_extension_data_last_pw_change);
257 if (ext)
258 *t = ext->data.u.last_pw_change;
259 else
260 *t = 0;
261
262 return 0;
263 }
264
265 krb5_error_code
hdb_entry_set_pw_change_time(krb5_context context,hdb_entry * entry,time_t t)266 hdb_entry_set_pw_change_time(krb5_context context,
267 hdb_entry *entry,
268 time_t t)
269 {
270 HDB_extension ext;
271
272 ext.mandatory = FALSE;
273 ext.data.element = choice_HDB_extension_data_last_pw_change;
274 if (t == 0)
275 t = time(NULL);
276 ext.data.u.last_pw_change = t;
277
278 return hdb_replace_extension(context, entry, &ext);
279 }
280
281 int
hdb_entry_get_password(krb5_context context,HDB * db,const hdb_entry * entry,char ** p)282 hdb_entry_get_password(krb5_context context, HDB *db,
283 const hdb_entry *entry, char **p)
284 {
285 HDB_extension *ext;
286 char *str;
287 int ret;
288
289 ext = hdb_find_extension(entry, choice_HDB_extension_data_password);
290 if (ext) {
291 heim_utf8_string xstr;
292 heim_octet_string pw;
293
294 if (db->hdb_master_key_set && ext->data.u.password.mkvno) {
295 hdb_master_key key;
296
297 key = _hdb_find_master_key(ext->data.u.password.mkvno,
298 db->hdb_master_key);
299
300 if (key == NULL) {
301 krb5_set_error_message(context, HDB_ERR_NO_MKEY,
302 "master key %d missing",
303 *ext->data.u.password.mkvno);
304 return HDB_ERR_NO_MKEY;
305 }
306
307 ret = _hdb_mkey_decrypt(context, key, HDB_KU_MKEY,
308 ext->data.u.password.password.data,
309 ext->data.u.password.password.length,
310 &pw);
311 } else {
312 ret = der_copy_octet_string(&ext->data.u.password.password, &pw);
313 }
314 if (ret) {
315 krb5_clear_error_message(context);
316 return ret;
317 }
318
319 xstr = pw.data;
320 if (xstr[pw.length - 1] != '\0') {
321 krb5_set_error_message(context, EINVAL, "malformed password");
322 return EINVAL;
323 }
324
325 *p = strdup(xstr);
326
327 der_free_octet_string(&pw);
328 if (*p == NULL) {
329 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
330 return ENOMEM;
331 }
332 return 0;
333 }
334
335 ret = krb5_unparse_name(context, entry->principal, &str);
336 if (ret == 0) {
337 krb5_set_error_message(context, ENOENT,
338 "no password attribute for %s", str);
339 free(str);
340 } else
341 krb5_clear_error_message(context);
342
343 return ENOENT;
344 }
345
346 int
hdb_entry_set_password(krb5_context context,HDB * db,hdb_entry * entry,const char * p)347 hdb_entry_set_password(krb5_context context, HDB *db,
348 hdb_entry *entry, const char *p)
349 {
350 HDB_extension ext;
351 hdb_master_key key;
352 int ret;
353
354 ext.mandatory = FALSE;
355 ext.data.element = choice_HDB_extension_data_password;
356
357 if (db->hdb_master_key_set) {
358
359 key = _hdb_find_master_key(NULL, db->hdb_master_key);
360 if (key == NULL) {
361 krb5_set_error_message(context, HDB_ERR_NO_MKEY,
362 "hdb_entry_set_password: "
363 "failed to find masterkey");
364 return HDB_ERR_NO_MKEY;
365 }
366
367 ret = _hdb_mkey_encrypt(context, key, HDB_KU_MKEY,
368 p, strlen(p) + 1,
369 &ext.data.u.password.password);
370 if (ret)
371 return ret;
372
373 ext.data.u.password.mkvno =
374 malloc(sizeof(*ext.data.u.password.mkvno));
375 if (ext.data.u.password.mkvno == NULL) {
376 free_HDB_extension(&ext);
377 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
378 return ENOMEM;
379 }
380 *ext.data.u.password.mkvno = _hdb_mkey_version(key);
381
382 } else {
383 ext.data.u.password.mkvno = NULL;
384
385 ret = krb5_data_copy(&ext.data.u.password.password,
386 p, strlen(p) + 1);
387 if (ret) {
388 krb5_set_error_message(context, ret, "malloc: out of memory");
389 free_HDB_extension(&ext);
390 return ret;
391 }
392 }
393
394 ret = hdb_replace_extension(context, entry, &ext);
395
396 free_HDB_extension(&ext);
397
398 return ret;
399 }
400
401 int
hdb_entry_clear_password(krb5_context context,hdb_entry * entry)402 hdb_entry_clear_password(krb5_context context, hdb_entry *entry)
403 {
404 return hdb_clear_extension(context, entry,
405 choice_HDB_extension_data_password);
406 }
407
408 krb5_error_code
hdb_entry_get_ConstrainedDelegACL(const hdb_entry * entry,const HDB_Ext_Constrained_delegation_acl ** a)409 hdb_entry_get_ConstrainedDelegACL(const hdb_entry *entry,
410 const HDB_Ext_Constrained_delegation_acl **a)
411 {
412 const HDB_extension *ext;
413
414 ext = hdb_find_extension(entry,
415 choice_HDB_extension_data_allowed_to_delegate_to);
416 if (ext)
417 *a = &ext->data.u.allowed_to_delegate_to;
418 else
419 *a = NULL;
420
421 return 0;
422 }
423
424 krb5_error_code
hdb_entry_get_aliases(const hdb_entry * entry,const HDB_Ext_Aliases ** a)425 hdb_entry_get_aliases(const hdb_entry *entry, const HDB_Ext_Aliases **a)
426 {
427 const HDB_extension *ext;
428
429 ext = hdb_find_extension(entry, choice_HDB_extension_data_aliases);
430 if (ext)
431 *a = &ext->data.u.aliases;
432 else
433 *a = NULL;
434
435 return 0;
436 }
437