source: trunk/server/source4/heimdal/lib/hdb/keytab.c

Last change on this file was 745, checked in by Silvan Scherrer, 13 years ago

Samba Server: updated trunk to 3.6.0
File size: 10.5 KB
Line 
1/*
2 * Copyright (c) 1999 - 2002 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
36/* keytab backend for HDB databases */
37
38struct hdb_data {
39 char *dbname;
40 char *mkey;
41};
42
43struct hdb_cursor {
44 HDB *db;
45 hdb_entry_ex hdb_entry;
46 int first, next;
47 int key_idx;
48};
49
50/*
51 * the format for HDB keytabs is:
52 * HDB:[HDBFORMAT:database-specific-data[:mkey=mkey-file]]
53 */
54
55static krb5_error_code KRB5_CALLCONV
56hdb_resolve(krb5_context context, const char *name, krb5_keytab id)
57{
58 struct hdb_data *d;
59 const char *db, *mkey;
60
61 d = malloc(sizeof(*d));
62 if(d == NULL) {
63 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
64 return ENOMEM;
65 }
66 db = name;
67 mkey = strstr(name, ":mkey=");
68 if(mkey == NULL || mkey[5] == '\0') {
69 if(*name == '\0')
70 d->dbname = NULL;
71 else {
72 d->dbname = strdup(name);
73 if(d->dbname == NULL) {
74 free(d);
75 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
76 return ENOMEM;
77 }
78 }
79 d->mkey = NULL;
80 } else {
81 d->dbname = malloc(mkey - db + 1);
82 if(d->dbname == NULL) {
83 free(d);
84 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
85 return ENOMEM;
86 }
87 memmove(d->dbname, db, mkey - db);
88 d->dbname[mkey - db] = '\0';
89
90 d->mkey = strdup(mkey + 5);
91 if(d->mkey == NULL) {
92 free(d->dbname);
93 free(d);
94 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
95 return ENOMEM;
96 }
97 }
98 id->data = d;
99 return 0;
100}
101
102static krb5_error_code KRB5_CALLCONV
103hdb_close(krb5_context context, krb5_keytab id)
104{
105 struct hdb_data *d = id->data;
106
107 free(d->dbname);
108 free(d->mkey);
109 free(d);
110 return 0;
111}
112
113static krb5_error_code KRB5_CALLCONV
114hdb_get_name(krb5_context context,
115 krb5_keytab id,
116 char *name,
117 size_t namesize)
118{
119 struct hdb_data *d = id->data;
120
121 snprintf(name, namesize, "%s%s%s",
122 d->dbname ? d->dbname : "",
123 (d->dbname || d->mkey) ? ":" : "",
124 d->mkey ? d->mkey : "");
125 return 0;
126}
127
128/*
129 * try to figure out the database (`dbname') and master-key (`mkey')
130 * that should be used for `principal'.
131 */
132
133static krb5_error_code
134find_db (krb5_context context,
135 char **dbname,
136 char **mkey,
137 krb5_const_principal principal)
138{
139 krb5_const_realm realm = krb5_principal_get_realm(context, principal);
140 krb5_error_code ret;
141 struct hdb_dbinfo *head, *dbinfo = NULL;
142
143 *dbname = *mkey = NULL;
144
145 ret = hdb_get_dbinfo(context, &head);
146 if (ret)
147 return ret;
148
149 while ((dbinfo = hdb_dbinfo_get_next(head, dbinfo)) != NULL) {
150 const char *p = hdb_dbinfo_get_realm(context, dbinfo);
151 if (p && strcmp (realm, p) == 0) {
152 p = hdb_dbinfo_get_dbname(context, dbinfo);
153 if (p)
154 *dbname = strdup(p);
155 p = hdb_dbinfo_get_mkey_file(context, dbinfo);
156 if (p)
157 *mkey = strdup(p);
158 break;
159 }
160 }
161 hdb_free_dbinfo(context, &head);
162 if (*dbname == NULL)
163 *dbname = strdup(HDB_DEFAULT_DB);
164 return 0;
165}
166
167/*
168 * find the keytab entry in `id' for `principal, kvno, enctype' and return
169 * it in `entry'. return 0 or an error code
170 */
171
172static krb5_error_code KRB5_CALLCONV
173hdb_get_entry(krb5_context context,
174 krb5_keytab id,
175 krb5_const_principal principal,
176 krb5_kvno kvno,
177 krb5_enctype enctype,
178 krb5_keytab_entry *entry)
179{
180 hdb_entry_ex ent;
181 krb5_error_code ret;
182 struct hdb_data *d = id->data;
183 const char *dbname = d->dbname;
184 const char *mkey = d->mkey;
185 char *fdbname = NULL, *fmkey = NULL;
186 HDB *db;
187 int i;
188
189 memset(&ent, 0, sizeof(ent));
190
191 if (dbname == NULL) {
192 ret = find_db(context, &fdbname, &fmkey, principal);
193 if (ret)
194 return ret;
195 dbname = fdbname;
196 mkey = fmkey;
197 }
198
199 ret = hdb_create (context, &db, dbname);
200 if (ret)
201 goto out2;
202 ret = hdb_set_master_keyfile (context, db, mkey);
203 if (ret) {
204 (*db->hdb_destroy)(context, db);
205 goto out2;
206 }
207
208 ret = (*db->hdb_open)(context, db, O_RDONLY, 0);
209 if (ret) {
210 (*db->hdb_destroy)(context, db);
211 goto out2;
212 }
213
214 ret = (*db->hdb_fetch_kvno)(context, db, principal,
215 HDB_F_DECRYPT|HDB_F_KVNO_SPECIFIED|
216 HDB_F_GET_CLIENT|HDB_F_GET_SERVER|HDB_F_GET_KRBTGT,
217 kvno, &ent);
218
219 if(ret == HDB_ERR_NOENTRY) {
220 ret = KRB5_KT_NOTFOUND;
221 goto out;
222 }else if(ret)
223 goto out;
224
225 if(kvno && ent.entry.kvno != kvno) {
226 hdb_free_entry(context, &ent);
227 ret = KRB5_KT_NOTFOUND;
228 goto out;
229 }
230 if(enctype == 0)
231 if(ent.entry.keys.len > 0)
232 enctype = ent.entry.keys.val[0].key.keytype;
233 ret = KRB5_KT_NOTFOUND;
234 for(i = 0; i < ent.entry.keys.len; i++) {
235 if(ent.entry.keys.val[i].key.keytype == enctype) {
236 krb5_copy_principal(context, principal, &entry->principal);
237 entry->vno = ent.entry.kvno;
238 krb5_copy_keyblock_contents(context,
239 &ent.entry.keys.val[i].key,
240 &entry->keyblock);
241 ret = 0;
242 break;
243 }
244 }
245 hdb_free_entry(context, &ent);
246 out:
247 (*db->hdb_close)(context, db);
248 (*db->hdb_destroy)(context, db);
249 out2:
250 free(fdbname);
251 free(fmkey);
252 return ret;
253}
254
255/*
256 * find the keytab entry in `id' for `principal, kvno, enctype' and return
257 * it in `entry'. return 0 or an error code
258 */
259
260static krb5_error_code KRB5_CALLCONV
261hdb_start_seq_get(krb5_context context,
262 krb5_keytab id,
263 krb5_kt_cursor *cursor)
264{
265 krb5_error_code ret;
266 struct hdb_cursor *c;
267 struct hdb_data *d = id->data;
268 const char *dbname = d->dbname;
269 const char *mkey = d->mkey;
270 HDB *db;
271
272 if (dbname == NULL) {
273 /*
274 * We don't support enumerating without being told what
275 * backend to enumerate on
276 */
277 ret = KRB5_KT_NOTFOUND;
278 return ret;
279 }
280
281 ret = hdb_create (context, &db, dbname);
282 if (ret)
283 return ret;
284 ret = hdb_set_master_keyfile (context, db, mkey);
285 if (ret) {
286 (*db->hdb_destroy)(context, db);
287 return ret;
288 }
289
290 ret = (*db->hdb_open)(context, db, O_RDONLY, 0);
291 if (ret) {
292 (*db->hdb_destroy)(context, db);
293 return ret;
294 }
295
296 cursor->data = c = malloc (sizeof(*c));
297 if(c == NULL){
298 (*db->hdb_close)(context, db);
299 (*db->hdb_destroy)(context, db);
300 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
301 return ENOMEM;
302 }
303
304 c->db = db;
305 c->first = TRUE;
306 c->next = TRUE;
307 c->key_idx = 0;
308
309 cursor->data = c;
310 return ret;
311}
312
313static int KRB5_CALLCONV
314hdb_next_entry(krb5_context context,
315 krb5_keytab id,
316 krb5_keytab_entry *entry,
317 krb5_kt_cursor *cursor)
318{
319 struct hdb_cursor *c = cursor->data;
320 krb5_error_code ret;
321
322 memset(entry, 0, sizeof(*entry));
323
324 if (c->first) {
325 c->first = FALSE;
326 ret = (c->db->hdb_firstkey)(context, c->db,
327 HDB_F_DECRYPT|
328 HDB_F_GET_CLIENT|HDB_F_GET_SERVER|HDB_F_GET_KRBTGT,
329 &c->hdb_entry);
330 if (ret == HDB_ERR_NOENTRY)
331 return KRB5_KT_END;
332 else if (ret)
333 return ret;
334
335 if (c->hdb_entry.entry.keys.len == 0)
336 hdb_free_entry(context, &c->hdb_entry);
337 else
338 c->next = FALSE;
339 }
340
341 while (c->next) {
342 ret = (c->db->hdb_nextkey)(context, c->db,
343 HDB_F_DECRYPT|
344 HDB_F_GET_CLIENT|HDB_F_GET_SERVER|HDB_F_GET_KRBTGT,
345 &c->hdb_entry);
346 if (ret == HDB_ERR_NOENTRY)
347 return KRB5_KT_END;
348 else if (ret)
349 return ret;
350
351 /* If no keys on this entry, try again */
352 if (c->hdb_entry.entry.keys.len == 0)
353 hdb_free_entry(context, &c->hdb_entry);
354 else
355 c->next = FALSE;
356 }
357
358 /*
359 * Return next enc type (keytabs are one slot per key, while
360 * hdb is one record per principal.
361 */
362
363 ret = krb5_copy_principal(context,
364 c->hdb_entry.entry.principal,
365 &entry->principal);
366 if (ret)
367 return ret;
368
369 entry->vno = c->hdb_entry.entry.kvno;
370 ret = krb5_copy_keyblock_contents(context,
371 &c->hdb_entry.entry.keys.val[c->key_idx].key,
372 &entry->keyblock);
373 if (ret) {
374 krb5_free_principal(context, entry->principal);
375 memset(entry, 0, sizeof(*entry));
376 return ret;
377 }
378 c->key_idx++;
379
380 /*
381 * Once we get to the end of the list, signal that we want the
382 * next entry
383 */
384
385 if (c->key_idx == c->hdb_entry.entry.keys.len) {
386 hdb_free_entry(context, &c->hdb_entry);
387 c->next = TRUE;
388 c->key_idx = 0;
389 }
390
391 return 0;
392}
393
394
395static int KRB5_CALLCONV
396hdb_end_seq_get(krb5_context context,
397 krb5_keytab id,
398 krb5_kt_cursor *cursor)
399{
400 struct hdb_cursor *c = cursor->data;
401
402 if (!c->next)
403 hdb_free_entry(context, &c->hdb_entry);
404
405 (c->db->hdb_close)(context, c->db);
406 (c->db->hdb_destroy)(context, c->db);
407
408 free(c);
409 return 0;
410}
411
412krb5_kt_ops hdb_kt_ops = {
413 "HDB",
414 hdb_resolve,
415 hdb_get_name,
416 hdb_close,
417 NULL, /* destroy */
418 hdb_get_entry,
419 hdb_start_seq_get,
420 hdb_next_entry,
421 hdb_end_seq_get,
422 NULL, /* add */
423 NULL /* remove */
424};
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