source: branches/samba-3.5.x/source4/heimdal/lib/hdb/ext.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 11.0 KB
Line 
1/*
2 * Copyright (c) 2004 - 2005 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "hdb_locl.h"
35#include <der.h>
36
37krb5_error_code
38hdb_entry_check_mandatory(krb5_context context, const hdb_entry *ent)
39{
40 int i;
41
42 if (ent->extensions == NULL)
43 return 0;
44
45 /*
46 * check for unknown extensions and if they where tagged mandatory
47 */
48
49 for (i = 0; i < ent->extensions->len; i++) {
50 if (ent->extensions->val[i].data.element !=
51 choice_HDB_extension_data_asn1_ellipsis)
52 continue;
53 if (ent->extensions->val[i].mandatory) {
54 krb5_set_error_message(context, HDB_ERR_MANDATORY_OPTION,
55 "Principal have unknown "
56 "mandatory extension");
57 return HDB_ERR_MANDATORY_OPTION;
58 }
59 }
60 return 0;
61}
62
63HDB_extension *
64hdb_find_extension(const hdb_entry *entry, int type)
65{
66 int i;
67
68 if (entry->extensions == NULL)
69 return NULL;
70
71 for (i = 0; i < entry->extensions->len; i++)
72 if (entry->extensions->val[i].data.element == type)
73 return &entry->extensions->val[i];
74 return NULL;
75}
76
77/*
78 * Replace the extension `ext' in `entry'. Make a copy of the
79 * extension, so the caller must still free `ext' on both success and
80 * failure. Returns 0 or error code.
81 */
82
83krb5_error_code
84hdb_replace_extension(krb5_context context,
85 hdb_entry *entry,
86 const HDB_extension *ext)
87{
88 HDB_extension *ext2;
89 HDB_extension *es;
90 int ret;
91
92 ext2 = NULL;
93
94 if (entry->extensions == NULL) {
95 entry->extensions = calloc(1, sizeof(*entry->extensions));
96 if (entry->extensions == NULL) {
97 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
98 return ENOMEM;
99 }
100 } else if (ext->data.element != choice_HDB_extension_data_asn1_ellipsis) {
101 ext2 = hdb_find_extension(entry, ext->data.element);
102 } else {
103 /*
104 * This is an unknown extention, and we are asked to replace a
105 * possible entry in `entry' that is of the same type. This
106 * might seem impossible, but ASN.1 CHOICE comes to our
107 * rescue. The first tag in each branch in the CHOICE is
108 * unique, so just find the element in the list that have the
109 * same tag was we are putting into the list.
110 */
111 Der_class replace_class, list_class;
112 Der_type replace_type, list_type;
113 unsigned int replace_tag, list_tag;
114 size_t size;
115 int i;
116
117 ret = der_get_tag(ext->data.u.asn1_ellipsis.data,
118 ext->data.u.asn1_ellipsis.length,
119 &replace_class, &replace_type, &replace_tag,
120 &size);
121 if (ret) {
122 krb5_set_error_message(context, ret, "hdb: failed to decode "
123 "replacement hdb extention");
124 return ret;
125 }
126
127 for (i = 0; i < entry->extensions->len; i++) {
128 HDB_extension *ext3 = &entry->extensions->val[i];
129
130 if (ext3->data.element != choice_HDB_extension_data_asn1_ellipsis)
131 continue;
132
133 ret = der_get_tag(ext3->data.u.asn1_ellipsis.data,
134 ext3->data.u.asn1_ellipsis.length,
135 &list_class, &list_type, &list_tag,
136 &size);
137 if (ret) {
138 krb5_set_error_message(context, ret, "hdb: failed to decode "
139 "present hdb extention");
140 return ret;
141 }
142
143 if (MAKE_TAG(replace_class,replace_type,replace_type) ==
144 MAKE_TAG(list_class,list_type,list_type)) {
145 ext2 = ext3;
146 break;
147 }
148 }
149 }
150
151 if (ext2) {
152 free_HDB_extension(ext2);
153 ret = copy_HDB_extension(ext, ext2);
154 if (ret)
155 krb5_set_error_message(context, ret, "hdb: failed to copy replacement "
156 "hdb extention");
157 return ret;
158 }
159
160 es = realloc(entry->extensions->val,
161 (entry->extensions->len+1)*sizeof(entry->extensions->val[0]));
162 if (es == NULL) {
163 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
164 return ENOMEM;
165 }
166 entry->extensions->val = es;
167
168 ret = copy_HDB_extension(ext,
169 &entry->extensions->val[entry->extensions->len]);
170 if (ret == 0)
171 entry->extensions->len++;
172 else
173 krb5_set_error_message(context, ret, "hdb: failed to copy new extension");
174
175 return ret;
176}
177
178krb5_error_code
179hdb_clear_extension(krb5_context context,
180 hdb_entry *entry,
181 int type)
182{
183 int i;
184
185 if (entry->extensions == NULL)
186 return 0;
187
188 for (i = 0; i < entry->extensions->len; i++) {
189 if (entry->extensions->val[i].data.element == type) {
190 free_HDB_extension(&entry->extensions->val[i]);
191 memmove(&entry->extensions->val[i],
192 &entry->extensions->val[i + 1],
193 sizeof(entry->extensions->val[i]) * (entry->extensions->len - i - 1));
194 entry->extensions->len--;
195 }
196 }
197 if (entry->extensions->len == 0) {
198 free(entry->extensions->val);
199 free(entry->extensions);
200 entry->extensions = NULL;
201 }
202
203 return 0;
204}
205
206
207krb5_error_code
208hdb_entry_get_pkinit_acl(const hdb_entry *entry, const HDB_Ext_PKINIT_acl **a)
209{
210 const HDB_extension *ext;
211
212 ext = hdb_find_extension(entry, choice_HDB_extension_data_pkinit_acl);
213 if (ext)
214 *a = &ext->data.u.pkinit_acl;
215 else
216 *a = NULL;
217
218 return 0;
219}
220
221krb5_error_code
222hdb_entry_get_pkinit_hash(const hdb_entry *entry, const HDB_Ext_PKINIT_hash **a)
223{
224 const HDB_extension *ext;
225
226 ext = hdb_find_extension(entry, choice_HDB_extension_data_pkinit_cert_hash);
227 if (ext)
228 *a = &ext->data.u.pkinit_cert_hash;
229 else
230 *a = NULL;
231
232 return 0;
233}
234
235krb5_error_code
236hdb_entry_get_pkinit_cert(const hdb_entry *entry, const HDB_Ext_PKINIT_cert **a)
237{
238 const HDB_extension *ext;
239
240 ext = hdb_find_extension(entry, choice_HDB_extension_data_pkinit_cert);
241 if (ext)
242 *a = &ext->data.u.pkinit_cert;
243 else
244 *a = NULL;
245
246 return 0;
247}
248
249krb5_error_code
250hdb_entry_get_pw_change_time(const hdb_entry *entry, time_t *t)
251{
252 const HDB_extension *ext;
253
254 ext = hdb_find_extension(entry, choice_HDB_extension_data_last_pw_change);
255 if (ext)
256 *t = ext->data.u.last_pw_change;
257 else
258 *t = 0;
259
260 return 0;
261}
262
263krb5_error_code
264hdb_entry_set_pw_change_time(krb5_context context,
265 hdb_entry *entry,
266 time_t t)
267{
268 HDB_extension ext;
269
270 ext.mandatory = FALSE;
271 ext.data.element = choice_HDB_extension_data_last_pw_change;
272 if (t == 0)
273 t = time(NULL);
274 ext.data.u.last_pw_change = t;
275
276 return hdb_replace_extension(context, entry, &ext);
277}
278
279int
280hdb_entry_get_password(krb5_context context, HDB *db,
281 const hdb_entry *entry, char **p)
282{
283 HDB_extension *ext;
284 char *str;
285 int ret;
286
287 ext = hdb_find_extension(entry, choice_HDB_extension_data_password);
288 if (ext) {
289 heim_utf8_string str;
290 heim_octet_string pw;
291
292 if (db->hdb_master_key_set && ext->data.u.password.mkvno) {
293 hdb_master_key key;
294
295 key = _hdb_find_master_key(ext->data.u.password.mkvno,
296 db->hdb_master_key);
297
298 if (key == NULL) {
299 krb5_set_error_message(context, HDB_ERR_NO_MKEY,
300 "master key %d missing",
301 *ext->data.u.password.mkvno);
302 return HDB_ERR_NO_MKEY;
303 }
304
305 ret = _hdb_mkey_decrypt(context, key, HDB_KU_MKEY,
306 ext->data.u.password.password.data,
307 ext->data.u.password.password.length,
308 &pw);
309 } else {
310 ret = der_copy_octet_string(&ext->data.u.password.password, &pw);
311 }
312 if (ret) {
313 krb5_clear_error_message(context);
314 return ret;
315 }
316
317 str = pw.data;
318 if (str[pw.length - 1] != '\0') {
319 krb5_set_error_message(context, EINVAL, "password malformated");
320 return EINVAL;
321 }
322
323 *p = strdup(str);
324
325 der_free_octet_string(&pw);
326 if (*p == NULL) {
327 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
328 return ENOMEM;
329 }
330 return 0;
331 }
332
333 ret = krb5_unparse_name(context, entry->principal, &str);
334 if (ret == 0) {
335 krb5_set_error_message(context, ENOENT, "no password attributefor %s", str);
336 free(str);
337 } else
338 krb5_clear_error_message(context);
339
340 return ENOENT;
341}
342
343int
344hdb_entry_set_password(krb5_context context, HDB *db,
345 hdb_entry *entry, const char *p)
346{
347 HDB_extension ext;
348 hdb_master_key key;
349 int ret;
350
351 ext.mandatory = FALSE;
352 ext.data.element = choice_HDB_extension_data_password;
353
354 if (db->hdb_master_key_set) {
355
356 key = _hdb_find_master_key(NULL, db->hdb_master_key);
357 if (key == NULL) {
358 krb5_set_error_message(context, HDB_ERR_NO_MKEY,
359 "hdb_entry_set_password: "
360 "failed to find masterkey");
361 return HDB_ERR_NO_MKEY;
362 }
363
364 ret = _hdb_mkey_encrypt(context, key, HDB_KU_MKEY,
365 p, strlen(p) + 1,
366 &ext.data.u.password.password);
367 if (ret)
368 return ret;
369
370 ext.data.u.password.mkvno =
371 malloc(sizeof(*ext.data.u.password.mkvno));
372 if (ext.data.u.password.mkvno == NULL) {
373 free_HDB_extension(&ext);
374 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
375 return ENOMEM;
376 }
377 *ext.data.u.password.mkvno = _hdb_mkey_version(key);
378
379 } else {
380 ext.data.u.password.mkvno = NULL;
381
382 ret = krb5_data_copy(&ext.data.u.password.password,
383 p, strlen(p) + 1);
384 if (ret) {
385 krb5_set_error_message(context, ret, "malloc: out of memory");
386 free_HDB_extension(&ext);
387 return ret;
388 }
389 }
390
391 ret = hdb_replace_extension(context, entry, &ext);
392
393 free_HDB_extension(&ext);
394
395 return ret;
396}
397
398int
399hdb_entry_clear_password(krb5_context context, hdb_entry *entry)
400{
401 return hdb_clear_extension(context, entry,
402 choice_HDB_extension_data_password);
403}
404
405krb5_error_code
406hdb_entry_get_ConstrainedDelegACL(const hdb_entry *entry,
407 const HDB_Ext_Constrained_delegation_acl **a)
408{
409 const HDB_extension *ext;
410
411 ext = hdb_find_extension(entry,
412 choice_HDB_extension_data_allowed_to_delegate_to);
413 if (ext)
414 *a = &ext->data.u.allowed_to_delegate_to;
415 else
416 *a = NULL;
417
418 return 0;
419}
420
421krb5_error_code
422hdb_entry_get_aliases(const hdb_entry *entry, const HDB_Ext_Aliases **a)
423{
424 const HDB_extension *ext;
425
426 ext = hdb_find_extension(entry, choice_HDB_extension_data_aliases);
427 if (ext)
428 *a = &ext->data.u.aliases;
429 else
430 *a = NULL;
431
432 return 0;
433}
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