Line data Source code
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 :
37 : krb5_error_code
38 0 : hdb_entry_check_mandatory(krb5_context context, const hdb_entry *ent)
39 : {
40 : size_t i;
41 :
42 0 : if (ent->extensions == NULL)
43 0 : return 0;
44 :
45 : /*
46 : * check for unknown extensions and if they where tagged mandatory
47 : */
48 :
49 0 : for (i = 0; i < ent->extensions->len; i++) {
50 0 : if (ent->extensions->val[i].data.element !=
51 : choice_HDB_extension_data_asn1_ellipsis)
52 0 : continue;
53 0 : if (ent->extensions->val[i].mandatory) {
54 0 : krb5_set_error_message(context, HDB_ERR_MANDATORY_OPTION,
55 : "Principal have unknown "
56 : "mandatory extension");
57 0 : return HDB_ERR_MANDATORY_OPTION;
58 : }
59 : }
60 0 : return 0;
61 : }
62 :
63 : HDB_extension *
64 70 : hdb_find_extension(const hdb_entry *entry, int type)
65 : {
66 : size_t i;
67 :
68 70 : if (entry->extensions == NULL)
69 70 : return NULL;
70 :
71 0 : for (i = 0; i < entry->extensions->len; i++)
72 0 : if (entry->extensions->val[i].data.element == (unsigned)type)
73 0 : return &entry->extensions->val[i];
74 0 : 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 :
83 : krb5_error_code
84 0 : hdb_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 0 : ext2 = NULL;
93 :
94 0 : if (entry->extensions == NULL) {
95 0 : entry->extensions = calloc(1, sizeof(*entry->extensions));
96 0 : if (entry->extensions == NULL) {
97 0 : krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
98 0 : return ENOMEM;
99 : }
100 0 : } else if (ext->data.element != choice_HDB_extension_data_asn1_ellipsis) {
101 0 : 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 : size_t i;
116 :
117 0 : 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 0 : if (ret) {
122 0 : krb5_set_error_message(context, ret, "hdb: failed to decode "
123 : "replacement hdb extention");
124 0 : return ret;
125 : }
126 :
127 0 : for (i = 0; i < entry->extensions->len; i++) {
128 0 : HDB_extension *ext3 = &entry->extensions->val[i];
129 :
130 0 : if (ext3->data.element != choice_HDB_extension_data_asn1_ellipsis)
131 0 : continue;
132 :
133 0 : 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 0 : if (ret) {
138 0 : krb5_set_error_message(context, ret, "hdb: failed to decode "
139 : "present hdb extention");
140 0 : return ret;
141 : }
142 :
143 0 : if (MAKE_TAG(replace_class,replace_type,replace_type) ==
144 0 : MAKE_TAG(list_class,list_type,list_type)) {
145 0 : ext2 = ext3;
146 0 : break;
147 : }
148 : }
149 : }
150 :
151 0 : if (ext2) {
152 0 : free_HDB_extension(ext2);
153 0 : ret = copy_HDB_extension(ext, ext2);
154 0 : if (ret)
155 0 : krb5_set_error_message(context, ret, "hdb: failed to copy replacement "
156 : "hdb extention");
157 0 : return ret;
158 : }
159 :
160 0 : es = realloc(entry->extensions->val,
161 0 : (entry->extensions->len+1)*sizeof(entry->extensions->val[0]));
162 0 : if (es == NULL) {
163 0 : krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
164 0 : return ENOMEM;
165 : }
166 0 : entry->extensions->val = es;
167 :
168 0 : ret = copy_HDB_extension(ext,
169 0 : &entry->extensions->val[entry->extensions->len]);
170 0 : if (ret == 0)
171 0 : entry->extensions->len++;
172 : else
173 0 : krb5_set_error_message(context, ret, "hdb: failed to copy new extension");
174 :
175 0 : return ret;
176 : }
177 :
178 : krb5_error_code
179 0 : hdb_clear_extension(krb5_context context,
180 : hdb_entry *entry,
181 : int type)
182 : {
183 : size_t i;
184 :
185 0 : if (entry->extensions == NULL)
186 0 : return 0;
187 :
188 0 : for (i = 0; i < entry->extensions->len; i++) {
189 0 : if (entry->extensions->val[i].data.element == (unsigned)type) {
190 0 : free_HDB_extension(&entry->extensions->val[i]);
191 0 : memmove(&entry->extensions->val[i],
192 0 : &entry->extensions->val[i + 1],
193 0 : sizeof(entry->extensions->val[i]) * (entry->extensions->len - i - 1));
194 0 : entry->extensions->len--;
195 : }
196 : }
197 0 : if (entry->extensions->len == 0) {
198 0 : free(entry->extensions->val);
199 0 : free(entry->extensions);
200 0 : entry->extensions = NULL;
201 : }
202 :
203 0 : return 0;
204 : }
205 :
206 :
207 : krb5_error_code
208 2 : hdb_entry_get_pkinit_acl(const hdb_entry *entry, const HDB_Ext_PKINIT_acl **a)
209 : {
210 : const HDB_extension *ext;
211 :
212 2 : ext = hdb_find_extension(entry, choice_HDB_extension_data_pkinit_acl);
213 2 : if (ext)
214 0 : *a = &ext->data.u.pkinit_acl;
215 : else
216 2 : *a = NULL;
217 :
218 2 : return 0;
219 : }
220 :
221 : krb5_error_code
222 0 : hdb_entry_get_pkinit_hash(const hdb_entry *entry, const HDB_Ext_PKINIT_hash **a)
223 : {
224 : const HDB_extension *ext;
225 :
226 0 : ext = hdb_find_extension(entry, choice_HDB_extension_data_pkinit_cert_hash);
227 0 : if (ext)
228 0 : *a = &ext->data.u.pkinit_cert_hash;
229 : else
230 0 : *a = NULL;
231 :
232 0 : return 0;
233 : }
234 :
235 : krb5_error_code
236 68 : hdb_entry_get_pkinit_cert(const hdb_entry *entry, const HDB_Ext_PKINIT_cert **a)
237 : {
238 : const HDB_extension *ext;
239 :
240 68 : ext = hdb_find_extension(entry, choice_HDB_extension_data_pkinit_cert);
241 68 : if (ext)
242 0 : *a = &ext->data.u.pkinit_cert;
243 : else
244 68 : *a = NULL;
245 :
246 68 : return 0;
247 : }
248 :
249 : krb5_error_code
250 0 : hdb_entry_get_pw_change_time(const hdb_entry *entry, time_t *t)
251 : {
252 : const HDB_extension *ext;
253 :
254 0 : ext = hdb_find_extension(entry, choice_HDB_extension_data_last_pw_change);
255 0 : if (ext)
256 0 : *t = ext->data.u.last_pw_change;
257 : else
258 0 : *t = 0;
259 :
260 0 : return 0;
261 : }
262 :
263 : krb5_error_code
264 0 : hdb_entry_set_pw_change_time(krb5_context context,
265 : hdb_entry *entry,
266 : time_t t)
267 : {
268 : HDB_extension ext;
269 :
270 0 : ext.mandatory = FALSE;
271 0 : ext.data.element = choice_HDB_extension_data_last_pw_change;
272 0 : if (t == 0)
273 0 : t = time(NULL);
274 0 : ext.data.u.last_pw_change = t;
275 :
276 0 : return hdb_replace_extension(context, entry, &ext);
277 : }
278 :
279 : int
280 0 : hdb_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 0 : ext = hdb_find_extension(entry, choice_HDB_extension_data_password);
288 0 : if (ext) {
289 : heim_utf8_string xstr;
290 : heim_octet_string pw;
291 :
292 0 : if (db->hdb_master_key_set && ext->data.u.password.mkvno) {
293 : hdb_master_key key;
294 :
295 0 : key = _hdb_find_master_key(ext->data.u.password.mkvno,
296 : db->hdb_master_key);
297 :
298 0 : if (key == NULL) {
299 0 : krb5_set_error_message(context, HDB_ERR_NO_MKEY,
300 : "master key %d missing",
301 0 : *ext->data.u.password.mkvno);
302 0 : return HDB_ERR_NO_MKEY;
303 : }
304 :
305 0 : 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 0 : ret = der_copy_octet_string(&ext->data.u.password.password, &pw);
311 : }
312 0 : if (ret) {
313 0 : krb5_clear_error_message(context);
314 0 : return ret;
315 : }
316 :
317 0 : xstr = pw.data;
318 0 : if (xstr[pw.length - 1] != '\0') {
319 0 : krb5_set_error_message(context, EINVAL, "malformed password");
320 0 : return EINVAL;
321 : }
322 :
323 0 : *p = strdup(xstr);
324 :
325 0 : der_free_octet_string(&pw);
326 0 : if (*p == NULL) {
327 0 : krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
328 0 : return ENOMEM;
329 : }
330 0 : return 0;
331 : }
332 :
333 0 : ret = krb5_unparse_name(context, entry->principal, &str);
334 0 : if (ret == 0) {
335 0 : krb5_set_error_message(context, ENOENT,
336 : "no password attribute for %s", str);
337 0 : free(str);
338 : } else
339 0 : krb5_clear_error_message(context);
340 :
341 0 : return ENOENT;
342 : }
343 :
344 : int
345 0 : hdb_entry_set_password(krb5_context context, HDB *db,
346 : hdb_entry *entry, const char *p)
347 : {
348 : HDB_extension ext;
349 : hdb_master_key key;
350 : int ret;
351 :
352 0 : ext.mandatory = FALSE;
353 0 : ext.data.element = choice_HDB_extension_data_password;
354 :
355 0 : if (db->hdb_master_key_set) {
356 :
357 0 : key = _hdb_find_master_key(NULL, db->hdb_master_key);
358 0 : if (key == NULL) {
359 0 : krb5_set_error_message(context, HDB_ERR_NO_MKEY,
360 : "hdb_entry_set_password: "
361 : "failed to find masterkey");
362 0 : return HDB_ERR_NO_MKEY;
363 : }
364 :
365 0 : ret = _hdb_mkey_encrypt(context, key, HDB_KU_MKEY,
366 0 : p, strlen(p) + 1,
367 : &ext.data.u.password.password);
368 0 : if (ret)
369 0 : return ret;
370 :
371 0 : ext.data.u.password.mkvno =
372 0 : malloc(sizeof(*ext.data.u.password.mkvno));
373 0 : if (ext.data.u.password.mkvno == NULL) {
374 0 : free_HDB_extension(&ext);
375 0 : krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
376 0 : return ENOMEM;
377 : }
378 0 : *ext.data.u.password.mkvno = _hdb_mkey_version(key);
379 :
380 : } else {
381 0 : ext.data.u.password.mkvno = NULL;
382 :
383 0 : ret = krb5_data_copy(&ext.data.u.password.password,
384 0 : p, strlen(p) + 1);
385 0 : if (ret) {
386 0 : krb5_set_error_message(context, ret, "malloc: out of memory");
387 0 : free_HDB_extension(&ext);
388 0 : return ret;
389 : }
390 : }
391 :
392 0 : ret = hdb_replace_extension(context, entry, &ext);
393 :
394 0 : free_HDB_extension(&ext);
395 :
396 0 : return ret;
397 : }
398 :
399 : int
400 0 : hdb_entry_clear_password(krb5_context context, hdb_entry *entry)
401 : {
402 0 : return hdb_clear_extension(context, entry,
403 : choice_HDB_extension_data_password);
404 : }
405 :
406 : krb5_error_code
407 0 : hdb_entry_get_ConstrainedDelegACL(const hdb_entry *entry,
408 : const HDB_Ext_Constrained_delegation_acl **a)
409 : {
410 : const HDB_extension *ext;
411 :
412 0 : ext = hdb_find_extension(entry,
413 : choice_HDB_extension_data_allowed_to_delegate_to);
414 0 : if (ext)
415 0 : *a = &ext->data.u.allowed_to_delegate_to;
416 : else
417 0 : *a = NULL;
418 :
419 0 : return 0;
420 : }
421 :
422 : krb5_error_code
423 0 : hdb_entry_get_aliases(const hdb_entry *entry, const HDB_Ext_Aliases **a)
424 : {
425 : const HDB_extension *ext;
426 :
427 0 : ext = hdb_find_extension(entry, choice_HDB_extension_data_aliases);
428 0 : if (ext)
429 0 : *a = &ext->data.u.aliases;
430 : else
431 0 : *a = NULL;
432 :
433 0 : return 0;
434 : }
435 :
436 : unsigned int
437 0 : hdb_entry_get_kvno_diff_clnt(const hdb_entry *entry)
438 : {
439 : const HDB_extension *ext;
440 :
441 0 : ext = hdb_find_extension(entry,
442 : choice_HDB_extension_data_hist_kvno_diff_clnt);
443 0 : if (ext)
444 0 : return ext->data.u.hist_kvno_diff_clnt;
445 0 : return 1;
446 : }
447 :
448 : krb5_error_code
449 0 : hdb_entry_set_kvno_diff_clnt(krb5_context context, hdb_entry *entry,
450 : unsigned int diff)
451 : {
452 : HDB_extension ext;
453 :
454 0 : if (diff > 16384)
455 0 : return EINVAL;
456 0 : ext.data.element = choice_HDB_extension_data_hist_kvno_diff_clnt;
457 0 : ext.data.u.hist_kvno_diff_clnt = diff;
458 0 : return hdb_replace_extension(context, entry, &ext);
459 : }
460 :
461 : krb5_error_code
462 0 : hdb_entry_clear_kvno_diff_clnt(krb5_context context, hdb_entry *entry)
463 : {
464 0 : return hdb_clear_extension(context, entry,
465 : choice_HDB_extension_data_hist_kvno_diff_clnt);
466 : }
467 :
468 : unsigned int
469 0 : hdb_entry_get_kvno_diff_svc(const hdb_entry *entry)
470 : {
471 : const HDB_extension *ext;
472 :
473 0 : ext = hdb_find_extension(entry,
474 : choice_HDB_extension_data_hist_kvno_diff_svc);
475 0 : if (ext)
476 0 : return ext->data.u.hist_kvno_diff_svc;
477 0 : return 1024; /* max_life effectively provides a better default */
478 : }
479 :
480 : krb5_error_code
481 0 : hdb_entry_set_kvno_diff_svc(krb5_context context, hdb_entry *entry,
482 : unsigned int diff)
483 : {
484 : HDB_extension ext;
485 :
486 0 : if (diff > 16384)
487 0 : return EINVAL;
488 0 : ext.data.element = choice_HDB_extension_data_hist_kvno_diff_svc;
489 0 : ext.data.u.hist_kvno_diff_svc = diff;
490 0 : return hdb_replace_extension(context, entry, &ext);
491 : }
492 :
493 : krb5_error_code
494 0 : hdb_entry_clear_kvno_diff_svc(krb5_context context, hdb_entry *entry)
495 : {
496 0 : return hdb_clear_extension(context, entry,
497 : choice_HDB_extension_data_hist_kvno_diff_svc);
498 : }
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