1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
|
/*
* Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "krb5_locl.h"
#include "hdb_locl.h"
RCSID("$Id$");
#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif
/*! @mainpage Heimdal database backend library
*
* @section intro Introduction
*
* Heimdal libhdb library provides the backend support for Heimdal kdc
* and kadmind. Its here where plugins for diffrent database engines
* can be pluged in and extend support for here Heimdal get the
* principal and policy data from.
*
* Example of Heimdal backend are:
* - Berkeley DB 1.85
* - Berkeley DB 3.0
* - Berkeley DB 4.0
* - New Berkeley DB
* - LDAP
*
*
* The project web page: http://www.h5l.org/
*
*/
static struct hdb_method methods[] = {
#if HAVE_DB1 || HAVE_DB3
{ HDB_INTERFACE_VERSION, "db:", hdb_db_create},
#endif
#if HAVE_NDBM
{ HDB_INTERFACE_VERSION, "ndbm:", hdb_ndbm_create},
#endif
#if defined(OPENLDAP) && !defined(OPENLDAP_MODULE)
{ HDB_INTERFACE_VERSION, "ldap:", hdb_ldap_create},
{ HDB_INTERFACE_VERSION, "ldapi:", hdb_ldapi_create},
#endif
{0, NULL, NULL}
};
#if HAVE_DB1 || HAVE_DB3
static struct hdb_method dbmetod =
{ HDB_INTERFACE_VERSION, "", hdb_db_create };
#elif defined(HAVE_NDBM)
static struct hdb_method dbmetod =
{ HDB_INTERFACE_VERSION, "", hdb_ndbm_create };
#endif
krb5_error_code
hdb_next_enctype2key(krb5_context context,
const hdb_entry *e,
krb5_enctype enctype,
Key **key)
{
Key *k;
for (k = *key ? (*key) + 1 : e->keys.val;
k < e->keys.val + e->keys.len;
k++)
{
if(k->key.keytype == enctype){
*key = k;
return 0;
}
}
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
"No next enctype %d for hdb-entry",
(int)enctype);
return KRB5_PROG_ETYPE_NOSUPP; /* XXX */
}
krb5_error_code
hdb_enctype2key(krb5_context context,
hdb_entry *e,
krb5_enctype enctype,
Key **key)
{
*key = NULL;
return hdb_next_enctype2key(context, e, enctype, key);
}
void
hdb_free_key(Key *key)
{
memset(key->key.keyvalue.data,
0,
key->key.keyvalue.length);
free_Key(key);
free(key);
}
krb5_error_code
hdb_lock(int fd, int operation)
{
int i, code = 0;
for(i = 0; i < 3; i++){
code = flock(fd, (operation == HDB_RLOCK ? LOCK_SH : LOCK_EX) | LOCK_NB);
if(code == 0 || errno != EWOULDBLOCK)
break;
sleep(1);
}
if(code == 0)
return 0;
if(errno == EWOULDBLOCK)
return HDB_ERR_DB_INUSE;
return HDB_ERR_CANT_LOCK_DB;
}
krb5_error_code
hdb_unlock(int fd)
{
int code;
code = flock(fd, LOCK_UN);
if(code)
return 4711 /* XXX */;
return 0;
}
void
hdb_free_entry(krb5_context context, hdb_entry_ex *ent)
{
int i;
if (ent->free_entry)
(*ent->free_entry)(context, ent);
for(i = 0; i < ent->entry.keys.len; ++i) {
Key *k = &ent->entry.keys.val[i];
memset (k->key.keyvalue.data, 0, k->key.keyvalue.length);
}
free_hdb_entry(&ent->entry);
}
krb5_error_code
hdb_foreach(krb5_context context,
HDB *db,
unsigned flags,
hdb_foreach_func_t func,
void *data)
{
krb5_error_code ret;
hdb_entry_ex entry;
ret = db->hdb_firstkey(context, db, flags, &entry);
if (ret == 0)
krb5_clear_error_message(context);
while(ret == 0){
ret = (*func)(context, db, &entry, data);
hdb_free_entry(context, &entry);
if(ret == 0)
ret = db->hdb_nextkey(context, db, flags, &entry);
}
if(ret == HDB_ERR_NOENTRY)
ret = 0;
return ret;
}
krb5_error_code
hdb_check_db_format(krb5_context context, HDB *db)
{
krb5_data tag;
krb5_data version;
krb5_error_code ret, ret2;
unsigned ver;
int foo;
ret = db->hdb_lock(context, db, HDB_RLOCK);
if (ret)
return ret;
tag.data = HDB_DB_FORMAT_ENTRY;
tag.length = strlen(tag.data);
ret = (*db->hdb__get)(context, db, tag, &version);
ret2 = db->hdb_unlock(context, db);
if(ret)
return ret;
if (ret2)
return ret2;
foo = sscanf(version.data, "%u", &ver);
krb5_data_free (&version);
if (foo != 1)
return HDB_ERR_BADVERSION;
if(ver != HDB_DB_FORMAT)
return HDB_ERR_BADVERSION;
return 0;
}
krb5_error_code
hdb_init_db(krb5_context context, HDB *db)
{
krb5_error_code ret, ret2;
krb5_data tag;
krb5_data version;
char ver[32];
ret = hdb_check_db_format(context, db);
if(ret != HDB_ERR_NOENTRY)
return ret;
ret = db->hdb_lock(context, db, HDB_WLOCK);
if (ret)
return ret;
tag.data = HDB_DB_FORMAT_ENTRY;
tag.length = strlen(tag.data);
snprintf(ver, sizeof(ver), "%u", HDB_DB_FORMAT);
version.data = ver;
version.length = strlen(version.data) + 1; /* zero terminated */
ret = (*db->hdb__put)(context, db, 0, tag, version);
ret2 = db->hdb_unlock(context, db);
if (ret) {
if (ret2)
krb5_clear_error_message(context);
return ret;
}
return ret2;
}
#ifdef HAVE_DLOPEN
/*
* Load a dynamic backend from /usr/heimdal/lib/hdb_NAME.so,
* looking for the hdb_NAME_create symbol.
*/
static const struct hdb_method *
find_dynamic_method (krb5_context context,
const char *filename,
const char **rest)
{
static struct hdb_method method;
struct hdb_so_method *mso;
char *prefix, *path, *symbol;
const char *p;
void *dl;
size_t len;
p = strchr(filename, ':');
/* if no prefix, don't know what module to load, just ignore it */
if (p == NULL)
return NULL;
len = p - filename;
*rest = filename + len + 1;
prefix = malloc(len + 1);
if (prefix == NULL)
krb5_errx(context, 1, "out of memory");
strlcpy(prefix, filename, len + 1);
if (asprintf(&path, LIBDIR "/hdb_%s.so", prefix) == -1)
krb5_errx(context, 1, "out of memory");
#ifndef RTLD_NOW
#define RTLD_NOW 0
#endif
#ifndef RTLD_GLOBAL
#define RTLD_GLOBAL 0
#endif
dl = dlopen(path, RTLD_NOW | RTLD_GLOBAL);
if (dl == NULL) {
krb5_warnx(context, "error trying to load dynamic module %s: %s\n",
path, dlerror());
free(prefix);
free(path);
return NULL;
}
if (asprintf(&symbol, "hdb_%s_interface", prefix) == -1)
krb5_errx(context, 1, "out of memory");
mso = dlsym(dl, symbol);
if (mso == NULL) {
krb5_warnx(context, "error finding symbol %s in %s: %s\n",
symbol, path, dlerror());
dlclose(dl);
free(symbol);
free(prefix);
free(path);
return NULL;
}
free(path);
free(symbol);
if (mso->version != HDB_INTERFACE_VERSION) {
krb5_warnx(context,
"error wrong version in shared module %s "
"version: %d should have been %d\n",
prefix, mso->version, HDB_INTERFACE_VERSION);
dlclose(dl);
free(prefix);
return NULL;
}
if (mso->create == NULL) {
krb5_errx(context, 1,
"no entry point function in shared mod %s ",
prefix);
dlclose(dl);
free(prefix);
return NULL;
}
method.create = mso->create;
method.prefix = prefix;
return &method;
}
#endif /* HAVE_DLOPEN */
/*
* find the relevant method for `filename', returning a pointer to the
* rest in `rest'.
* return NULL if there's no such method.
*/
static const struct hdb_method *
find_method (const char *filename, const char **rest)
{
const struct hdb_method *h;
for (h = methods; h->prefix != NULL; ++h) {
if (strncmp (filename, h->prefix, strlen(h->prefix)) == 0) {
*rest = filename + strlen(h->prefix);
return h;
}
}
#if defined(HAVE_DB1) || defined(HAVE_DB3) || defined(HAVE_NDBM)
if (strncmp(filename, "/", 1) == 0
|| strncmp(filename, "./", 2) == 0
|| strncmp(filename, "../", 3) == 0)
{
*rest = filename;
return &dbmetod;
}
#endif
return NULL;
}
krb5_error_code
hdb_list_builtin(krb5_context context, char **list)
{
const struct hdb_method *h;
size_t len = 0;
char *buf = NULL;
for (h = methods; h->prefix != NULL; ++h) {
if (h->prefix[0] == '\0')
continue;
len += strlen(h->prefix) + 2;
}
len += 1;
buf = malloc(len);
if (buf == NULL) {
krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
return ENOMEM;
}
buf[0] = '\0';
for (h = methods; h->prefix != NULL; ++h) {
if (h != methods)
strlcat(buf, ", ", len);
strlcat(buf, h->prefix, len);
}
*list = buf;
return 0;
}
/**
* Create a handle for a Kerberos database
*
* Create a handle for a Kerberos database backend specified by a
* filename. Doesn't create a file if its doesn't exists, you have to
* use O_CREAT to tell the backend to create the file.
*/
krb5_error_code
hdb_create(krb5_context context, HDB **db, const char *filename)
{
const struct hdb_method *h;
const char *residual;
krb5_error_code ret;
struct krb5_plugin *list = NULL, *e;
if(filename == NULL)
filename = HDB_DEFAULT_DB;
krb5_add_et_list(context, initialize_hdb_error_table_r);
h = find_method (filename, &residual);
if (h == NULL) {
ret = _krb5_plugin_find(context, PLUGIN_TYPE_DATA, "hdb", &list);
if(ret == 0 && list != NULL) {
for (e = list; e != NULL; e = _krb5_plugin_get_next(e)) {
h = _krb5_plugin_get_symbol(e);
if (strncmp (filename, h->prefix, strlen(h->prefix)) == 0
&& h->interface_version == HDB_INTERFACE_VERSION) {
residual = filename + strlen(h->prefix);
break;
}
}
if (e == NULL) {
h = NULL;
_krb5_plugin_free(list);
}
}
}
#ifdef HAVE_DLOPEN
if (h == NULL)
h = find_dynamic_method (context, filename, &residual);
#endif
if (h == NULL)
krb5_errx(context, 1, "No database support for %s", filename);
return (*h->create)(context, db, residual);
}
|