]> CyberLeo.Net >> Repos - FreeBSD/releng/10.0.git/blob - crypto/heimdal/lib/hdb/hdb-sqlite.c
- Copy stable/10 (r259064) to releng/10.0 as part of the
[FreeBSD/releng/10.0.git] / crypto / heimdal / lib / hdb / hdb-sqlite.c
1 /*
2  * Copyright (c) 2009 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 "sqlite3.h"
36
37 #define MAX_RETRIES 10
38
39 typedef struct hdb_sqlite_db {
40     double version;
41     sqlite3 *db;
42     char *db_file;
43
44     sqlite3_stmt *get_version;
45     sqlite3_stmt *fetch;
46     sqlite3_stmt *get_ids;
47     sqlite3_stmt *add_entry;
48     sqlite3_stmt *add_principal;
49     sqlite3_stmt *add_alias;
50     sqlite3_stmt *delete_aliases;
51     sqlite3_stmt *update_entry;
52     sqlite3_stmt *remove;
53     sqlite3_stmt *get_all_entries;
54
55 } hdb_sqlite_db;
56
57 /* This should be used to mark updates which make the code incompatible
58  * with databases created with previous versions. Don't update it if
59  * compatibility is not broken. */
60 #define HDBSQLITE_VERSION 0.1
61
62 #define _HDBSQLITE_STRINGIFY(x) #x
63 #define HDBSQLITE_STRINGIFY(x) _HDBSQLITE_STRINGIFY(x)
64
65 #define HDBSQLITE_CREATE_TABLES \
66                  " BEGIN TRANSACTION;" \
67                  " CREATE TABLE Version (number REAL);" \
68                  " INSERT INTO Version (number)" \
69                  " VALUES (" HDBSQLITE_STRINGIFY(HDBSQLITE_VERSION) ");" \
70                  " CREATE TABLE Principal" \
71                  "  (id INTEGER PRIMARY KEY," \
72                  "   principal TEXT UNIQUE NOT NULL," \
73                  "   canonical INTEGER," \
74                  "   entry INTEGER);" \
75                  " CREATE TABLE Entry" \
76                  "  (id INTEGER PRIMARY KEY," \
77                  "   data BLOB);" \
78                  " COMMIT"
79 #define HDBSQLITE_CREATE_TRIGGERS \
80                  " CREATE TRIGGER remove_principals AFTER DELETE ON Entry" \
81                  " BEGIN" \
82                  "  DELETE FROM Principal" \
83                  "  WHERE entry = OLD.id;" \
84                  " END"
85 #define HDBSQLITE_GET_VERSION \
86                  " SELECT number FROM Version"
87 #define HDBSQLITE_FETCH \
88                  " SELECT Entry.data FROM Principal, Entry" \
89                  " WHERE Principal.principal = ? AND" \
90                  "       Entry.id = Principal.entry"
91 #define HDBSQLITE_GET_IDS \
92                  " SELECT id, entry FROM Principal" \
93                  " WHERE principal = ?"
94 #define HDBSQLITE_ADD_ENTRY \
95                  " INSERT INTO Entry (data) VALUES (?)"
96 #define HDBSQLITE_ADD_PRINCIPAL \
97                  " INSERT INTO Principal (principal, entry, canonical)" \
98                  " VALUES (?, last_insert_rowid(), 1)"
99 #define HDBSQLITE_ADD_ALIAS \
100                  " INSERT INTO Principal (principal, entry, canonical)" \
101                  " VALUES(?, ?, 0)"
102 #define HDBSQLITE_DELETE_ALIASES \
103                  " DELETE FROM Principal" \
104                  " WHERE entry = ? AND canonical = 0"
105 #define HDBSQLITE_UPDATE_ENTRY \
106                  " UPDATE Entry SET data = ?" \
107                  " WHERE id = ?"
108 #define HDBSQLITE_REMOVE \
109                  " DELETE FROM ENTRY WHERE id = " \
110                  "  (SELECT entry FROM Principal" \
111                  "   WHERE principal = ?)"
112 #define HDBSQLITE_GET_ALL_ENTRIES \
113                  " SELECT data FROM Entry"
114
115 /**
116  * Wrapper around sqlite3_prepare_v2.
117  *
118  * @param context   The current krb5 context
119  * @param statement Where to store the pointer to the statement
120  *                  after preparing it
121  * @param str       SQL code for the statement
122  *
123  * @return          0 if OK, an error code if not
124  */
125 static krb5_error_code
126 hdb_sqlite_prepare_stmt(krb5_context context,
127                         sqlite3 *db,
128                         sqlite3_stmt **statement,
129                         const char *str)
130 {
131     int ret, tries = 0;
132
133     ret = sqlite3_prepare_v2(db, str, -1, statement, NULL);
134     while((tries++ < MAX_RETRIES) &&
135           ((ret == SQLITE_BUSY) ||
136            (ret == SQLITE_IOERR_BLOCKED) ||
137            (ret == SQLITE_LOCKED))) {
138         krb5_warnx(context, "hdb-sqlite: prepare busy");
139         sleep(1);
140         ret = sqlite3_prepare_v2(db, str, -1, statement, NULL);
141     }
142
143     if (ret != SQLITE_OK) {
144         krb5_set_error_message(context, EINVAL,
145                                "Failed to prepare stmt %s: %s",
146                                str, sqlite3_errmsg(db));
147         return EINVAL;
148     }
149
150     return 0;
151 }
152
153 /**
154  * A wrapper around sqlite3_exec.
155  *
156  * @param context    The current krb5 context
157  * @param database   An open sqlite3 database handle
158  * @param statement  SQL code to execute
159  * @param error_code What to return if the statement fails
160  *
161  * @return           0 if OK, else error_code
162  */
163 static krb5_error_code
164 hdb_sqlite_exec_stmt(krb5_context context,
165                      sqlite3 *database,
166                      const char *statement,
167                      krb5_error_code error_code)
168 {
169     int ret;
170
171     ret = sqlite3_exec(database, statement, NULL, NULL, NULL);
172
173     while(((ret == SQLITE_BUSY) ||
174            (ret == SQLITE_IOERR_BLOCKED) ||
175            (ret == SQLITE_LOCKED))) {
176         krb5_warnx(context, "hdb-sqlite: exec busy: %d", (int)getpid());
177         sleep(1);
178         ret = sqlite3_exec(database, statement, NULL, NULL, NULL);
179     }
180
181     if (ret != SQLITE_OK && error_code) {
182         krb5_set_error_message(context, error_code,
183                                "Execute %s: %s", statement,
184                               sqlite3_errmsg(database));
185         return error_code;
186     }
187
188     return 0;
189 }
190
191 /**
192  * Opens an sqlite3 database handle to a file, may create the
193  * database file depending on flags.
194  *
195  * @param context The current krb5 context
196  * @param db      Heimdal database handle
197  * @param flags   Controls whether or not the file may be created,
198  *                may be 0 or SQLITE_OPEN_CREATE
199  */
200 static krb5_error_code
201 hdb_sqlite_open_database(krb5_context context, HDB *db, int flags)
202 {
203     int ret;
204     hdb_sqlite_db *hsdb = (hdb_sqlite_db*) db->hdb_db;
205
206     ret = sqlite3_open_v2(hsdb->db_file, &hsdb->db,
207                           SQLITE_OPEN_READWRITE | flags, NULL);
208
209     if (ret) {
210         if (hsdb->db) {
211             ret = ENOENT;
212             krb5_set_error_message(context, ret,
213                                   "Error opening sqlite database %s: %s",
214                                   hsdb->db_file, sqlite3_errmsg(hsdb->db));
215             sqlite3_close(hsdb->db);
216             hsdb->db = NULL;
217         } else
218             ret = krb5_enomem(context);
219         return ret;
220     }
221
222     return 0;
223 }
224
225 static int
226 hdb_sqlite_step(krb5_context context, sqlite3 *db, sqlite3_stmt *stmt)
227 {
228     int ret;
229
230     ret = sqlite3_step(stmt);
231     while(((ret == SQLITE_BUSY) ||
232            (ret == SQLITE_IOERR_BLOCKED) ||
233            (ret == SQLITE_LOCKED))) {
234         krb5_warnx(context, "hdb-sqlite: step busy: %d", (int)getpid());
235         sleep(1);
236         ret = sqlite3_step(stmt);
237     }
238     return ret;
239 }
240
241 /**
242  * Closes the database and frees memory allocated for statements.
243  *
244  * @param context The current krb5 context
245  * @param db      Heimdal database handle
246  */
247 static krb5_error_code
248 hdb_sqlite_close_database(krb5_context context, HDB *db)
249 {
250     hdb_sqlite_db *hsdb = (hdb_sqlite_db *) db->hdb_db;
251
252     sqlite3_finalize(hsdb->get_version);
253     sqlite3_finalize(hsdb->fetch);
254     sqlite3_finalize(hsdb->get_ids);
255     sqlite3_finalize(hsdb->add_entry);
256     sqlite3_finalize(hsdb->add_principal);
257     sqlite3_finalize(hsdb->add_alias);
258     sqlite3_finalize(hsdb->delete_aliases);
259     sqlite3_finalize(hsdb->update_entry);
260     sqlite3_finalize(hsdb->remove);
261     sqlite3_finalize(hsdb->get_all_entries);
262
263     sqlite3_close(hsdb->db);
264
265     return 0;
266 }
267
268 /**
269  * Opens an sqlite database file and prepares it for use.
270  * If the file does not exist it will be created.
271  *
272  * @param context  The current krb5_context
273  * @param db       The heimdal database handle
274  * @param filename Where to store the database file
275  *
276  * @return         0 if everything worked, an error code if not
277  */
278 static krb5_error_code
279 hdb_sqlite_make_database(krb5_context context, HDB *db, const char *filename)
280 {
281     int ret;
282     int created_file = 0;
283     hdb_sqlite_db *hsdb = (hdb_sqlite_db *) db->hdb_db;
284
285     hsdb->db_file = strdup(filename);
286     if(hsdb->db_file == NULL)
287         return ENOMEM;
288
289     ret = hdb_sqlite_open_database(context, db, 0);
290     if (ret) {
291         ret = hdb_sqlite_open_database(context, db, SQLITE_OPEN_CREATE);
292         if (ret) goto out;
293
294         created_file = 1;
295
296         ret = hdb_sqlite_exec_stmt(context, hsdb->db,
297                                    HDBSQLITE_CREATE_TABLES,
298                                    EINVAL);
299         if (ret) goto out;
300
301         ret = hdb_sqlite_exec_stmt(context, hsdb->db,
302                                    HDBSQLITE_CREATE_TRIGGERS,
303                                    EINVAL);
304         if (ret) goto out;
305     }
306
307     ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
308                                   &hsdb->get_version,
309                                   HDBSQLITE_GET_VERSION);
310     if (ret) goto out;
311     ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
312                                   &hsdb->fetch,
313                                   HDBSQLITE_FETCH);
314     if (ret) goto out;
315     ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
316                                   &hsdb->get_ids,
317                                   HDBSQLITE_GET_IDS);
318     if (ret) goto out;
319     ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
320                                   &hsdb->add_entry,
321                                   HDBSQLITE_ADD_ENTRY);
322     if (ret) goto out;
323     ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
324                                   &hsdb->add_principal,
325                                   HDBSQLITE_ADD_PRINCIPAL);
326     if (ret) goto out;
327     ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
328                                   &hsdb->add_alias,
329                                   HDBSQLITE_ADD_ALIAS);
330     if (ret) goto out;
331     ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
332                                   &hsdb->delete_aliases,
333                                   HDBSQLITE_DELETE_ALIASES);
334     if (ret) goto out;
335     ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
336                                   &hsdb->update_entry,
337                                   HDBSQLITE_UPDATE_ENTRY);
338     if (ret) goto out;
339     ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
340                                   &hsdb->remove,
341                                   HDBSQLITE_REMOVE);
342     if (ret) goto out;
343     ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
344                                   &hsdb->get_all_entries,
345                                   HDBSQLITE_GET_ALL_ENTRIES);
346     if (ret) goto out;
347
348     ret = hdb_sqlite_step(context, hsdb->db, hsdb->get_version);
349     if(ret == SQLITE_ROW) {
350         hsdb->version = sqlite3_column_double(hsdb->get_version, 0);
351     }
352     sqlite3_reset(hsdb->get_version);
353     ret = 0;
354
355     if(hsdb->version != HDBSQLITE_VERSION) {
356         ret = EINVAL;
357         krb5_set_error_message(context, ret, "HDBSQLITE_VERSION mismatch");
358     }
359
360     if(ret) goto out;
361
362     return 0;
363
364  out:
365     if (hsdb->db)
366         sqlite3_close(hsdb->db);
367     if (created_file)
368         unlink(hsdb->db_file);
369
370     return ret;
371 }
372
373 /**
374  * Retrieves an entry by searching for the given
375  * principal in the Principal database table, both
376  * for canonical principals and aliases.
377  *
378  * @param context   The current krb5_context
379  * @param db        Heimdal database handle
380  * @param principal The principal whose entry to search for
381  * @param flags     Currently only for HDB_F_DECRYPT
382  * @param kvno      kvno to fetch is HDB_F_KVNO_SPECIFIED use used
383  *
384  * @return          0 if everything worked, an error code if not
385  */
386 static krb5_error_code
387 hdb_sqlite_fetch_kvno(krb5_context context, HDB *db, krb5_const_principal principal,
388                       unsigned flags, krb5_kvno kvno, hdb_entry_ex *entry)
389 {
390     int sqlite_error;
391     krb5_error_code ret;
392     char *principal_string;
393     hdb_sqlite_db *hsdb = (hdb_sqlite_db*)(db->hdb_db);
394     sqlite3_stmt *fetch = hsdb->fetch;
395     krb5_data value;
396
397     ret = krb5_unparse_name(context, principal, &principal_string);
398     if (ret) {
399         free(principal_string);
400         return ret;
401     }
402
403     sqlite3_bind_text(fetch, 1, principal_string, -1, SQLITE_STATIC);
404
405     sqlite_error = hdb_sqlite_step(context, hsdb->db, fetch);
406     if (sqlite_error != SQLITE_ROW) {
407         if(sqlite_error == SQLITE_DONE) {
408             ret = HDB_ERR_NOENTRY;
409             goto out;
410         } else {
411             ret = EINVAL;
412             krb5_set_error_message(context, ret,
413                                   "sqlite fetch failed: %d",
414                                   sqlite_error);
415             goto out;
416         }
417     }
418
419     value.length = sqlite3_column_bytes(fetch, 0);
420     value.data = (void *) sqlite3_column_blob(fetch, 0);
421
422     ret = hdb_value2entry(context, &value, &entry->entry);
423     if(ret)
424         goto out;
425
426     if (db->hdb_master_key_set && (flags & HDB_F_DECRYPT)) {
427         ret = hdb_unseal_keys(context, db, &entry->entry);
428         if(ret) {
429            hdb_free_entry(context, entry);
430            goto out;
431         }
432     }
433
434     ret = 0;
435
436 out:
437
438     sqlite3_clear_bindings(fetch);
439     sqlite3_reset(fetch);
440
441     free(principal_string);
442
443     return ret;
444 }
445
446 /**
447  * Convenience function to step a prepared statement with no
448  * value once.
449  *
450  * @param context   The current krb5_context
451  * @param statement A prepared sqlite3 statement
452  *
453  * @return        0 if everything worked, an error code if not
454  */
455 static krb5_error_code
456 hdb_sqlite_step_once(krb5_context context, HDB *db, sqlite3_stmt *statement)
457 {
458     int ret;
459     hdb_sqlite_db *hsdb = (hdb_sqlite_db *) db->hdb_db;
460
461     ret = hdb_sqlite_step(context, hsdb->db, statement);
462     sqlite3_clear_bindings(statement);
463     sqlite3_reset(statement);
464
465     return ret;
466 }
467
468
469 /**
470  * Stores an hdb_entry in the database. If flags contains HDB_F_REPLACE
471  * a previous entry may be replaced.
472  *
473  * @param context The current krb5_context
474  * @param db      Heimdal database handle
475  * @param flags   May currently only contain HDB_F_REPLACE
476  * @param entry   The data to store
477  *
478  * @return        0 if everything worked, an error code if not
479  */
480 static krb5_error_code
481 hdb_sqlite_store(krb5_context context, HDB *db, unsigned flags,
482                  hdb_entry_ex *entry)
483 {
484     int ret;
485     int i;
486     sqlite_int64 entry_id;
487     char *principal_string = NULL;
488     char *alias_string;
489     const HDB_Ext_Aliases *aliases;
490
491     hdb_sqlite_db *hsdb = (hdb_sqlite_db *)(db->hdb_db);
492     krb5_data value;
493     sqlite3_stmt *get_ids = hsdb->get_ids;
494
495     ret = hdb_sqlite_exec_stmt(context, hsdb->db,
496                                "BEGIN IMMEDIATE TRANSACTION", EINVAL);
497     if(ret != SQLITE_OK) {
498         ret = EINVAL;
499         krb5_set_error_message(context, ret,
500                                "SQLite BEGIN TRANSACTION failed: %s",
501                                sqlite3_errmsg(hsdb->db));
502         goto rollback;
503     }
504
505     ret = krb5_unparse_name(context,
506                             entry->entry.principal, &principal_string);
507     if (ret) {
508         goto rollback;
509     }
510
511     ret = hdb_seal_keys(context, db, &entry->entry);
512     if(ret) {
513         goto rollback;
514     }
515
516     ret = hdb_entry2value(context, &entry->entry, &value);
517     if(ret) {
518         goto rollback;
519     }
520
521     sqlite3_bind_text(get_ids, 1, principal_string, -1, SQLITE_STATIC);
522     ret = hdb_sqlite_step(context, hsdb->db, get_ids);
523
524     if(ret == SQLITE_DONE) { /* No such principal */
525
526         sqlite3_bind_blob(hsdb->add_entry, 1,
527                           value.data, value.length, SQLITE_STATIC);
528         ret = hdb_sqlite_step(context, hsdb->db, hsdb->add_entry);
529         sqlite3_clear_bindings(hsdb->add_entry);
530         sqlite3_reset(hsdb->add_entry);
531         if(ret != SQLITE_DONE)
532             goto rollback;
533
534         sqlite3_bind_text(hsdb->add_principal, 1,
535                           principal_string, -1, SQLITE_STATIC);
536         ret = hdb_sqlite_step(context, hsdb->db, hsdb->add_principal);
537         sqlite3_clear_bindings(hsdb->add_principal);
538         sqlite3_reset(hsdb->add_principal);
539         if(ret != SQLITE_DONE)
540             goto rollback;
541
542         entry_id = sqlite3_column_int64(get_ids, 1);
543
544     } else if(ret == SQLITE_ROW) { /* Found a principal */
545
546         if(! (flags & HDB_F_REPLACE)) /* Not allowed to replace it */
547             goto rollback;
548
549         entry_id = sqlite3_column_int64(get_ids, 1);
550
551         sqlite3_bind_int64(hsdb->delete_aliases, 1, entry_id);
552         ret = hdb_sqlite_step_once(context, db, hsdb->delete_aliases);
553         if(ret != SQLITE_DONE)
554             goto rollback;
555
556         sqlite3_bind_blob(hsdb->update_entry, 1,
557                           value.data, value.length, SQLITE_STATIC);
558         sqlite3_bind_int64(hsdb->update_entry, 2, entry_id);
559         ret = hdb_sqlite_step_once(context, db, hsdb->update_entry);
560         if(ret != SQLITE_DONE)
561             goto rollback;
562
563     } else {
564         /* Error! */
565         goto rollback;
566     }
567
568     ret = hdb_entry_get_aliases(&entry->entry, &aliases);
569     if(ret || aliases == NULL)
570         goto commit;
571
572     for(i = 0; i < aliases->aliases.len; i++) {
573
574         ret = krb5_unparse_name(context, &aliases->aliases.val[i],
575                                 &alias_string);
576         if (ret) {
577             free(alias_string);
578             goto rollback;
579         }
580
581         sqlite3_bind_text(hsdb->add_alias, 1, alias_string,
582                           -1, SQLITE_STATIC);
583         sqlite3_bind_int64(hsdb->add_alias, 2, entry_id);
584         ret = hdb_sqlite_step_once(context, db, hsdb->add_alias);
585
586         free(alias_string);
587
588         if(ret != SQLITE_DONE)
589             goto rollback;
590     }
591
592     ret = 0;
593
594 commit:
595
596     free(principal_string);
597
598     krb5_data_free(&value);
599
600     sqlite3_clear_bindings(get_ids);
601     sqlite3_reset(get_ids);
602
603     ret = hdb_sqlite_exec_stmt(context, hsdb->db, "COMMIT", EINVAL);
604     if(ret != SQLITE_OK)
605         krb5_warnx(context, "hdb-sqlite: COMMIT problem: %d: %s",
606                    ret, sqlite3_errmsg(hsdb->db));
607
608     return ret;
609
610 rollback:
611
612     krb5_warnx(context, "hdb-sqlite: store rollback problem: %d: %s",
613                ret, sqlite3_errmsg(hsdb->db));
614
615     free(principal_string);
616
617     ret = hdb_sqlite_exec_stmt(context, hsdb->db,
618                                "ROLLBACK", EINVAL);
619     return ret;
620 }
621
622 /**
623  * This may be called often by other code, since the BDB backends
624  * can not have several open connections. SQLite can handle
625  * many processes with open handles to the database file
626  * and closing/opening the handle is an expensive operation.
627  * Hence, this function does nothing.
628  *
629  * @param context The current krb5 context
630  * @param db      Heimdal database handle
631  *
632  * @return        Always returns 0
633  */
634 static krb5_error_code
635 hdb_sqlite_close(krb5_context context, HDB *db)
636 {
637     return 0;
638 }
639
640 /**
641  * The opposite of hdb_sqlite_close. Since SQLite accepts
642  * many open handles to the database file the handle does not
643  * need to be closed, or reopened.
644  *
645  * @param context The current krb5 context
646  * @param db      Heimdal database handle
647  * @param flags
648  * @param mode_t
649  *
650  * @return        Always returns 0
651  */
652 static krb5_error_code
653 hdb_sqlite_open(krb5_context context, HDB *db, int flags, mode_t mode)
654 {
655     return 0;
656 }
657
658 /**
659  * Closes the databse and frees all resources.
660  *
661  * @param context The current krb5 context
662  * @param db      Heimdal database handle
663  *
664  * @return        0 on success, an error code if not
665  */
666 static krb5_error_code
667 hdb_sqlite_destroy(krb5_context context, HDB *db)
668 {
669     int ret;
670     hdb_sqlite_db *hsdb;
671
672     ret = hdb_clear_master_key(context, db);
673
674     hdb_sqlite_close_database(context, db);
675
676     hsdb = (hdb_sqlite_db*)(db->hdb_db);
677
678     free(hsdb->db_file);
679     free(db->hdb_db);
680     free(db);
681
682     return ret;
683 }
684
685 /*
686  * Not sure if this is needed.
687  */
688 static krb5_error_code
689 hdb_sqlite_lock(krb5_context context, HDB *db, int operation)
690 {
691     krb5_set_error_message(context, HDB_ERR_CANT_LOCK_DB,
692                            "lock not implemented");
693     return HDB_ERR_CANT_LOCK_DB;
694 }
695
696 /*
697  * Not sure if this is needed.
698  */
699 static krb5_error_code
700 hdb_sqlite_unlock(krb5_context context, HDB *db)
701 {
702     krb5_set_error_message(context, HDB_ERR_CANT_LOCK_DB,
703                           "unlock not implemented");
704     return HDB_ERR_CANT_LOCK_DB;
705 }
706
707 /*
708  * Should get the next entry, to allow iteration over all entries.
709  */
710 static krb5_error_code
711 hdb_sqlite_nextkey(krb5_context context, HDB *db, unsigned flags,
712                    hdb_entry_ex *entry)
713 {
714     krb5_error_code ret = 0;
715     int sqlite_error;
716     krb5_data value;
717
718     hdb_sqlite_db *hsdb = (hdb_sqlite_db *) db->hdb_db;
719
720     sqlite_error = hdb_sqlite_step(context, hsdb->db, hsdb->get_all_entries);
721     if(sqlite_error == SQLITE_ROW) {
722         /* Found an entry */
723         value.length = sqlite3_column_bytes(hsdb->get_all_entries, 0);
724         value.data = (void *) sqlite3_column_blob(hsdb->get_all_entries, 0);
725         memset(entry, 0, sizeof(*entry));
726         ret = hdb_value2entry(context, &value, &entry->entry);
727     }
728     else if(sqlite_error == SQLITE_DONE) {
729         /* No more entries */
730         ret = HDB_ERR_NOENTRY;
731         sqlite3_reset(hsdb->get_all_entries);
732     }
733     else {
734         /* XXX SQLite error. Should be handled in some way. */
735         ret = EINVAL;
736     }
737
738     return ret;
739 }
740
741 /*
742  * Should get the first entry in the database.
743  * What is flags used for?
744  */
745 static krb5_error_code
746 hdb_sqlite_firstkey(krb5_context context, HDB *db, unsigned flags,
747                     hdb_entry_ex *entry)
748 {
749     hdb_sqlite_db *hsdb = (hdb_sqlite_db *) db->hdb_db;
750     krb5_error_code ret;
751
752     sqlite3_reset(hsdb->get_all_entries);
753
754     ret = hdb_sqlite_nextkey(context, db, flags, entry);
755     if(ret)
756         return ret;
757
758     return 0;
759 }
760
761 /*
762  * Renames the database file.
763  */
764 static krb5_error_code
765 hdb_sqlite_rename(krb5_context context, HDB *db, const char *new_name)
766 {
767     hdb_sqlite_db *hsdb = (hdb_sqlite_db *) db->hdb_db;
768     int ret;
769
770     krb5_warnx(context, "hdb_sqlite_rename");
771
772     if (strncasecmp(new_name, "sqlite:", 7) == 0)
773         new_name += 7;
774
775     hdb_sqlite_close_database(context, db);
776
777     ret = rename(hsdb->db_file, new_name);
778     free(hsdb->db_file);
779
780     hdb_sqlite_make_database(context, db, new_name);
781
782     return ret;
783 }
784
785 /*
786  * Removes a principal, including aliases and associated entry.
787  */
788 static krb5_error_code
789 hdb_sqlite_remove(krb5_context context, HDB *db,
790                   krb5_const_principal principal)
791 {
792     krb5_error_code ret;
793     char *principal_string;
794     hdb_sqlite_db *hsdb = (hdb_sqlite_db*)(db->hdb_db);
795     sqlite3_stmt *remove = hsdb->remove;
796
797     ret = krb5_unparse_name(context, principal, &principal_string);
798     if (ret) {
799         free(principal_string);
800         return ret;
801     }
802
803     sqlite3_bind_text(remove, 1, principal_string, -1, SQLITE_STATIC);
804
805     ret = hdb_sqlite_step(context, hsdb->db, remove);
806     if (ret != SQLITE_DONE) {
807         ret = EINVAL;
808         krb5_set_error_message(context, ret,
809                               "sqlite remove failed: %d",
810                               ret);
811     } else
812         ret = 0;
813
814     sqlite3_clear_bindings(remove);
815     sqlite3_reset(remove);
816
817     return ret;
818 }
819
820 /**
821  * Create SQLITE object, and creates the on disk database if its doesn't exists.
822  *
823  * @param context A Kerberos 5 context.
824  * @param db a returned database handle.
825  * @param argument filename
826  *
827  * @return        0 on success, an error code if not
828  */
829
830 krb5_error_code
831 hdb_sqlite_create(krb5_context context, HDB **db, const char *argument)
832 {
833     krb5_error_code ret;
834     hdb_sqlite_db *hsdb;
835
836     *db = calloc(1, sizeof (**db));
837     if (*db == NULL)
838         return krb5_enomem(context);
839
840     hsdb = (hdb_sqlite_db*) calloc(1, sizeof (*hsdb));
841     if (hsdb == NULL) {
842         free(*db);
843         *db = NULL;
844         return krb5_enomem(context);
845     }
846
847     (*db)->hdb_db = hsdb;
848
849     /* XXX make_database should make sure everything else is freed on error */
850     ret = hdb_sqlite_make_database(context, *db, argument);
851     if (ret) {
852         free((*db)->hdb_db);
853         free(*db);
854
855         return ret;
856     }
857
858     (*db)->hdb_master_key_set = 0;
859     (*db)->hdb_openp = 0;
860     (*db)->hdb_capability_flags = 0;
861
862     (*db)->hdb_open = hdb_sqlite_open;
863     (*db)->hdb_close = hdb_sqlite_close;
864
865     (*db)->hdb_lock = hdb_sqlite_lock;
866     (*db)->hdb_unlock = hdb_sqlite_unlock;
867     (*db)->hdb_firstkey = hdb_sqlite_firstkey;
868     (*db)->hdb_nextkey = hdb_sqlite_nextkey;
869     (*db)->hdb_fetch_kvno = hdb_sqlite_fetch_kvno;
870     (*db)->hdb_store = hdb_sqlite_store;
871     (*db)->hdb_remove = hdb_sqlite_remove;
872     (*db)->hdb_destroy = hdb_sqlite_destroy;
873     (*db)->hdb_rename = hdb_sqlite_rename;
874     (*db)->hdb__get = NULL;
875     (*db)->hdb__put = NULL;
876     (*db)->hdb__del = NULL;
877
878     return 0;
879 }