1 /* $NetBSD: set_keys.c,v 1.4 2023/06/19 21:41:44 christos Exp $ */
2
3 /*
4 * Copyright (c) 1997 - 2001, 2003 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 "kadm5_locl.h"
37
38 __RCSID("$NetBSD: set_keys.c,v 1.4 2023/06/19 21:41:44 christos Exp $");
39
40 /*
41 * Set the keys of `ent' to the string-to-key of `password'
42 */
43
44 kadm5_ret_t
_kadm5_set_keys(kadm5_server_context * context,hdb_entry * ent,int n_ks_tuple,krb5_key_salt_tuple * ks_tuple,const char * password)45 _kadm5_set_keys(kadm5_server_context *context,
46 hdb_entry *ent,
47 int n_ks_tuple,
48 krb5_key_salt_tuple *ks_tuple,
49 const char *password)
50 {
51 Key *keys;
52 size_t num_keys;
53 kadm5_ret_t ret;
54
55 ret = hdb_generate_key_set_password_with_ks_tuple(context->context,
56 ent->principal,
57 password,
58 ks_tuple, n_ks_tuple,
59 &keys, &num_keys);
60 if (ret)
61 return ret;
62
63 _kadm5_free_keys (context->context, ent->keys.len, ent->keys.val);
64 ent->keys.val = keys;
65 ent->keys.len = num_keys;
66
67 hdb_entry_set_pw_change_time(context->context, ent, 0);
68
69 if (krb5_config_get_bool_default(context->context, NULL, FALSE,
70 "kadmin", "save-password", NULL))
71 {
72 ret = hdb_entry_set_password(context->context, context->db,
73 ent, password);
74 if (ret)
75 return ret;
76 }
77
78 return 0;
79 }
80
81 static void
setup_Key(Key * k,Salt * s,krb5_key_data * kd,size_t kd_offset)82 setup_Key(Key *k, Salt *s, krb5_key_data *kd, size_t kd_offset)
83 {
84 memset(k, 0, sizeof (*k)); /* sets mkvno and salt */
85 k->key.keytype = kd[kd_offset].key_data_type[0];
86 k->key.keyvalue.length = kd[kd_offset].key_data_length[0];
87 k->key.keyvalue.data = kd[kd_offset].key_data_contents[0];
88
89 if(kd[kd_offset].key_data_ver == 2) {
90 memset(s, 0, sizeof (*s));
91 s->type = kd[kd_offset].key_data_type[1];
92 s->salt.length = kd[kd_offset].key_data_length[1];
93 s->salt.data = kd[kd_offset].key_data_contents[1];
94 k->salt = s;
95 }
96 }
97
98 /*
99 * Set the keys of `ent' to (`n_key_data', `key_data')
100 */
101
102 kadm5_ret_t
_kadm5_set_keys2(kadm5_server_context * context,hdb_entry * ent,int16_t n_key_data,krb5_key_data * key_data)103 _kadm5_set_keys2(kadm5_server_context *context,
104 hdb_entry *ent,
105 int16_t n_key_data,
106 krb5_key_data *key_data)
107 {
108 krb5_error_code ret;
109 size_t i, k;
110 HDB_extension ext;
111 HDB_extension *extp = NULL;
112 HDB_Ext_KeySet *hist_keys = &ext.data.u.hist_keys;
113 Key key;
114 Salt salt;
115 Keys keys;
116 hdb_keyset hkset;
117 krb5_kvno kvno = -1;
118 int one_key_set = 1;
119 int replace_hist_keys = 0;
120
121 if (n_key_data == 0) {
122 /* Clear all keys! */
123 ret = hdb_clear_extension(context->context, ent,
124 choice_HDB_extension_data_hist_keys);
125 if (ret)
126 return ret;
127 free_Keys(&ent->keys);
128 return 0;
129 }
130
131 memset(&keys, 0, sizeof (keys));
132 memset(&hkset, 0, sizeof (hkset)); /* set set_time */
133 memset(&ext, 0, sizeof (ext));
134 ext.mandatory = FALSE;
135 ext.data.element = choice_HDB_extension_data_hist_keys;
136 memset(hist_keys, 0, sizeof (*hist_keys));
137
138 for (i = 0; i < n_key_data; i++) {
139 if (kvno != -1 && kvno != key_data[i].key_data_kvno) {
140 one_key_set = 0;
141 break;
142 }
143 kvno = key_data[i].key_data_kvno;
144 }
145 if (one_key_set) {
146 /*
147 * If we're updating KADM5_KEY_DATA with a single keyset then we
148 * assume we must be setting the principal's kvno as well!
149 *
150 * Just have to be careful about old clients that might have
151 * sent 0 as the kvno... This may seem ugly, but it's the price
152 * of backwards compatibility with pre-multi-kvno kadmin clients
153 * (besides, who's to say that updating KADM5_KEY_DATA requires
154 * updating the entry's kvno?)
155 *
156 * Note that we do nothing special for the case where multiple
157 * keysets are given but the entry's kvno is not set and not in
158 * the given set of keysets. If this happens we'll just update
159 * the key history only and leave the current keyset alone.
160 */
161 if (kvno == 0) {
162 /* Force kvno to 1 if it was 0; (ank would do this anyways) */
163 if (ent->kvno == 0)
164 ent->kvno = 1;
165 /* Below we need key_data[*].kvno to be reasonable */
166 for (i = 0; i < n_key_data; i++)
167 key_data[i].key_data_kvno = ent->kvno;
168 } else {
169 /*
170 * Or force the entry's kvno to match the one from the new,
171 * singular keyset
172 */
173 ent->kvno = kvno;
174 }
175 }
176
177 for (i = 0; i < n_key_data; i++) {
178 if (key_data[i].key_data_kvno == ent->kvno) {
179 /* A current key; add to current key set */
180 setup_Key(&key, &salt, key_data, i);
181 ret = add_Keys(&keys, &key);
182 if (ret)
183 goto out;
184 continue;
185 }
186
187 /*
188 * This kvno is historical. Build an hdb_keyset for keys of
189 * this enctype and add them to the new key history.
190 */
191 for (k = 0; k < hist_keys->len; k++) {
192 if (hist_keys->val[k].kvno == key_data[i].key_data_kvno)
193 break;
194 }
195 if (hist_keys->len > k &&
196 hist_keys->val[k].kvno == key_data[i].key_data_kvno)
197 /* We've added all keys of this kvno already (see below) */
198 continue;
199
200 memset(&hkset, 0, sizeof (hkset)); /* set set_time */
201 hkset.kvno = key_data[i].key_data_kvno;
202 for (k = 0; k < n_key_data; k++) {
203 /* Find all keys of this kvno and add them to the new keyset */
204 if (key_data[k].key_data_kvno != hkset.kvno)
205 continue;
206
207 setup_Key(&key, &salt, key_data, k);
208 ret = add_Keys(&hkset.keys, &key);
209 if (ret) {
210 free_hdb_keyset(&hkset);
211 goto out;
212 }
213 }
214 ret = add_HDB_Ext_KeySet(hist_keys, &hkset);
215 free_hdb_keyset(&hkset);
216 if (ret)
217 goto out;
218 replace_hist_keys = 1;
219 }
220
221 if (replace_hist_keys)
222 /* No key history given -> leave it alone */
223 extp = hdb_find_extension(ent, choice_HDB_extension_data_hist_keys);
224 if (extp != NULL) {
225 HDB_Ext_KeySet *old_hist_keys;
226
227 /*
228 * Try to keep the very useful set_time values from the old hist
229 * keys. kadm5 loses this info, so this heuristic is the best we
230 * can do.
231 */
232 old_hist_keys = &extp->data.u.hist_keys;
233 for (i = 0; i < old_hist_keys->len; i++) {
234 if (old_hist_keys->val[i].set_time == NULL)
235 continue;
236 for (k = 0; k < hist_keys->len; k++) {
237 if (hist_keys->val[k].kvno != old_hist_keys->val[k].kvno)
238 continue;
239 hist_keys->val[k].set_time = old_hist_keys->val[k].set_time;
240 old_hist_keys->val[k].set_time = NULL;
241 }
242 }
243 }
244
245 if (replace_hist_keys) {
246 /* If hist keys not given in key_data then don't blow away hist_keys */
247 ret = hdb_replace_extension(context->context, ent, &ext);
248 if (ret)
249 goto out;
250 }
251
252 /*
253 * A structure copy is more efficient here than this would be:
254 *
255 * copy_Keys(&keys, &ent->keys);
256 * free_Keys(&keys);
257 *
258 * Of course, the above hdb_replace_extension() is not at all efficient...
259 */
260 free_HDB_extension(&ext);
261 free_Keys(&ent->keys);
262 free_hdb_keyset(&hkset);
263 ent->keys = keys;
264 hdb_entry_set_pw_change_time(context->context, ent, 0);
265 hdb_entry_clear_password(context->context, ent);
266
267 return 0;
268
269 out:
270 free_Keys(&keys);
271 free_HDB_extension(&ext);
272 return ret;
273 }
274
275 /*
276 * Set the keys of `ent' to `n_keys, keys'
277 */
278
279 kadm5_ret_t
_kadm5_set_keys3(kadm5_server_context * context,hdb_entry * ent,int n_keys,krb5_keyblock * keyblocks)280 _kadm5_set_keys3(kadm5_server_context *context,
281 hdb_entry *ent,
282 int n_keys,
283 krb5_keyblock *keyblocks)
284 {
285 krb5_error_code ret;
286 int i;
287 unsigned len;
288 Key *keys;
289
290 len = n_keys;
291 keys = malloc (len * sizeof(*keys));
292 if (keys == NULL && len != 0)
293 return ENOMEM;
294
295 _kadm5_init_keys (keys, len);
296
297 for(i = 0; i < n_keys; i++) {
298 keys[i].mkvno = NULL;
299 ret = krb5_copy_keyblock_contents (context->context,
300 &keyblocks[i],
301 &keys[i].key);
302 if(ret)
303 goto out;
304 keys[i].salt = NULL;
305 }
306 _kadm5_free_keys (context->context, ent->keys.len, ent->keys.val);
307 ent->keys.len = len;
308 ent->keys.val = keys;
309
310 hdb_entry_set_pw_change_time(context->context, ent, 0);
311 hdb_entry_clear_password(context->context, ent);
312
313 return 0;
314 out:
315 _kadm5_free_keys (context->context, len, keys);
316 return ret;
317 }
318
319 /*
320 *
321 */
322
323 static int
is_des_key_p(int keytype)324 is_des_key_p(int keytype)
325 {
326 return keytype == ETYPE_DES_CBC_CRC ||
327 keytype == ETYPE_DES_CBC_MD4 ||
328 keytype == ETYPE_DES_CBC_MD5;
329 }
330
331
332 /*
333 * Set the keys of `ent' to random keys and return them in `n_keys'
334 * and `new_keys'.
335 */
336
337 kadm5_ret_t
_kadm5_set_keys_randomly(kadm5_server_context * context,hdb_entry * ent,int n_ks_tuple,krb5_key_salt_tuple * ks_tuple,krb5_keyblock ** new_keys,int * n_keys)338 _kadm5_set_keys_randomly (kadm5_server_context *context,
339 hdb_entry *ent,
340 int n_ks_tuple,
341 krb5_key_salt_tuple *ks_tuple,
342 krb5_keyblock **new_keys,
343 int *n_keys)
344 {
345 krb5_keyblock *kblock = NULL;
346 kadm5_ret_t ret = 0;
347 int des_keyblock;
348 size_t i, num_keys;
349 Key *keys;
350
351 ret = hdb_generate_key_set(context->context, ent->principal,
352 ks_tuple, n_ks_tuple, &keys, &num_keys, 1);
353 if (ret)
354 return ret;
355
356 kblock = malloc(num_keys * sizeof(kblock[0]));
357 if (kblock == NULL) {
358 ret = ENOMEM;
359 _kadm5_free_keys (context->context, num_keys, keys);
360 return ret;
361 }
362 memset(kblock, 0, num_keys * sizeof(kblock[0]));
363
364 des_keyblock = -1;
365 for (i = 0; i < num_keys; i++) {
366
367 /*
368 * To make sure all des keys are the the same we generate only
369 * the first one and then copy key to all other des keys.
370 */
371
372 if (des_keyblock != -1 && is_des_key_p(keys[i].key.keytype)) {
373 ret = krb5_copy_keyblock_contents (context->context,
374 &kblock[des_keyblock],
375 &kblock[i]);
376 if (ret)
377 goto out;
378 kblock[i].keytype = keys[i].key.keytype;
379 } else {
380 ret = krb5_generate_random_keyblock (context->context,
381 keys[i].key.keytype,
382 &kblock[i]);
383 if (ret)
384 goto out;
385
386 if (is_des_key_p(keys[i].key.keytype))
387 des_keyblock = i;
388 }
389
390 ret = krb5_copy_keyblock_contents (context->context,
391 &kblock[i],
392 &keys[i].key);
393 if (ret)
394 goto out;
395 }
396
397 out:
398 if(ret) {
399 for (i = 0; i < num_keys; ++i)
400 krb5_free_keyblock_contents (context->context, &kblock[i]);
401 free(kblock);
402 _kadm5_free_keys (context->context, num_keys, keys);
403 return ret;
404 }
405
406 _kadm5_free_keys (context->context, ent->keys.len, ent->keys.val);
407 ent->keys.val = keys;
408 ent->keys.len = num_keys;
409 if (n_keys && new_keys) {
410 *new_keys = kblock;
411 *n_keys = num_keys;
412 } else {
413 free(kblock);
414 }
415
416 hdb_entry_set_pw_change_time(context->context, ent, 0);
417 hdb_entry_clear_password(context->context, ent);
418
419 return 0;
420 }
421