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-rw-r--r--source3/passdb/pdb_tdb.c215
1 files changed, 201 insertions, 14 deletions
diff --git a/source3/passdb/pdb_tdb.c b/source3/passdb/pdb_tdb.c
index ab266515da..73fcfee4b3 100644
--- a/source3/passdb/pdb_tdb.c
+++ b/source3/passdb/pdb_tdb.c
@@ -142,6 +142,149 @@ static int tdbsam_convert_one(struct db_record *rec, void *priv)
return 0;
}
+/**********************************************************************
+ Struct and function to backup an old record.
+ *********************************************************************/
+
+struct tdbsam_backup_state {
+ struct db_context *new_db;
+ bool success;
+};
+
+static int backup_copy_fn(struct db_record *orig_rec, void *state)
+{
+ struct tdbsam_backup_state *bs = (struct tdbsam_backup_state *)state;
+ struct db_record *new_rec;
+ NTSTATUS status;
+
+ new_rec = bs->new_db->fetch_locked(bs->new_db, talloc_tos(), orig_rec->key);
+ if (new_rec == NULL) {
+ bs->success = false;
+ return 1;
+ }
+
+ status = new_rec->store(new_rec, orig_rec->value, TDB_INSERT);
+
+ TALLOC_FREE(new_rec);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ bs->success = false;
+ return 1;
+ }
+ return 0;
+}
+
+/**********************************************************************
+ Make a backup of an old passdb and replace the new one with it. We
+ have to do this as between 3.0.x and 3.2.x the hash function changed
+ by mistake (used unsigned char * instead of char *). This means the
+ previous simple update code will fail due to not being able to find
+ existing records to replace in the tdbsam_convert_one() function. JRA.
+ *********************************************************************/
+
+static bool tdbsam_convert_backup(const char *dbname, struct db_context **pp_db)
+{
+ TALLOC_CTX *frame = talloc_stackframe();
+ const char *tmp_fname = NULL;
+ struct db_context *tmp_db = NULL;
+ struct db_context *orig_db = *pp_db;
+ struct tdbsam_backup_state bs;
+ int ret;
+
+ tmp_fname = talloc_asprintf(frame, "%s.tmp", dbname);
+ if (!tmp_fname) {
+ TALLOC_FREE(frame);
+ return false;
+ }
+
+ unlink(tmp_fname);
+
+ /* Remember to open this on the NULL context. We need
+ * it to stay around after we return from here. */
+
+ tmp_db = db_open(NULL, tmp_fname, 0,
+ TDB_DEFAULT, O_CREAT|O_RDWR, 0600);
+ if (tmp_db == NULL) {
+ DEBUG(0, ("tdbsam_convert_backup: Failed to create backup TDB passwd "
+ "[%s]\n", tmp_fname));
+ TALLOC_FREE(frame);
+ return false;
+ }
+
+ if (orig_db->transaction_start(orig_db) != 0) {
+ DEBUG(0, ("tdbsam_convert_backup: Could not start transaction (1)\n"));
+ unlink(tmp_fname);
+ TALLOC_FREE(tmp_db);
+ TALLOC_FREE(frame);
+ return false;
+ }
+ if (tmp_db->transaction_start(tmp_db) != 0) {
+ DEBUG(0, ("tdbsam_convert_backup: Could not start transaction (2)\n"));
+ orig_db->transaction_cancel(orig_db);
+ unlink(tmp_fname);
+ TALLOC_FREE(tmp_db);
+ TALLOC_FREE(frame);
+ return false;
+ }
+
+ bs.new_db = tmp_db;
+ bs.success = true;
+
+ ret = orig_db->traverse(orig_db, backup_copy_fn, (void *)&bs);
+ if (ret < 0) {
+ DEBUG(0, ("tdbsam_convert_backup: traverse failed\n"));
+ goto cancel;
+ }
+
+ if (!bs.success) {
+ DEBUG(0, ("tdbsam_convert_backup: Rewriting records failed\n"));
+ goto cancel;
+ }
+
+ if (orig_db->transaction_commit(orig_db) != 0) {
+ smb_panic("tdbsam_convert_backup: orig commit failed\n");
+ }
+ if (tmp_db->transaction_commit(tmp_db) != 0) {
+ smb_panic("tdbsam_convert_backup: orig commit failed\n");
+ }
+
+ /* This is safe from other users as we know we're
+ * under a mutex here. */
+
+ if (rename(tmp_fname, dbname) == -1) {
+ DEBUG(0, ("tdbsam_convert_backup: rename of %s to %s failed %s\n",
+ tmp_fname,
+ dbname,
+ strerror(errno)));
+ smb_panic("tdbsam_convert_backup: replace passdb failed\n");
+ }
+
+ TALLOC_FREE(frame);
+ TALLOC_FREE(orig_db);
+
+ DEBUG(1, ("tdbsam_convert_backup: updated %s file.\n",
+ dbname ));
+
+ /* Replace the global db pointer. */
+ *pp_db = tmp_db;
+ return true;
+
+ cancel:
+
+ if (orig_db->transaction_cancel(orig_db) != 0) {
+ smb_panic("tdbsam_convert: transaction_cancel failed");
+ }
+
+ if (tmp_db->transaction_cancel(tmp_db) != 0) {
+ smb_panic("tdbsam_convert: transaction_cancel failed");
+ }
+
+ unlink(tmp_fname);
+ TALLOC_FREE(tmp_db);
+ TALLOC_FREE(frame);
+ return false;
+}
+
static bool tdbsam_upgrade_next_rid(struct db_context *db)
{
TDB_CONTEXT *tdb;
@@ -173,43 +316,50 @@ static bool tdbsam_upgrade_next_rid(struct db_context *db)
return true;
}
-static bool tdbsam_convert(struct db_context *db, int32 from)
+static bool tdbsam_convert(struct db_context **pp_db, const char *name, int32 from)
{
struct tdbsam_convert_state state;
+ struct db_context *db = NULL;
int ret;
+ if (!tdbsam_convert_backup(name, pp_db)) {
+ DEBUG(0, ("tdbsam_convert: Could not backup %s\n", name));
+ return false;
+ }
+
+ db = *pp_db;
state.from = from;
state.success = true;
if (db->transaction_start(db) != 0) {
- DEBUG(0, ("Could not start transaction\n"));
+ DEBUG(0, ("tdbsam_convert: Could not start transaction\n"));
return false;
}
if (!tdbsam_upgrade_next_rid(db)) {
- DEBUG(0, ("tdbsam_upgrade_next_rid failed\n"));
+ DEBUG(0, ("tdbsam_convert: tdbsam_upgrade_next_rid failed\n"));
goto cancel;
}
ret = db->traverse(db, tdbsam_convert_one, &state);
if (ret < 0) {
- DEBUG(0, ("traverse failed\n"));
+ DEBUG(0, ("tdbsam_convert: traverse failed\n"));
goto cancel;
}
if (!state.success) {
- DEBUG(0, ("Converting records failed\n"));
+ DEBUG(0, ("tdbsam_convert: Converting records failed\n"));
goto cancel;
}
if (dbwrap_store_int32(db, TDBSAM_VERSION_STRING,
TDBSAM_VERSION) != 0) {
- DEBUG(0, ("Could not store tdbsam version\n"));
+ DEBUG(0, ("tdbsam_convert: Could not store tdbsam version\n"));
goto cancel;
}
if (db->transaction_commit(db) != 0) {
- DEBUG(0, ("Could not commit transaction\n"));
+ DEBUG(0, ("tdbsam_convert: Could not commit transaction\n"));
return false;
}
@@ -217,7 +367,7 @@ static bool tdbsam_convert(struct db_context *db, int32 from)
cancel:
if (db->transaction_cancel(db) != 0) {
- smb_panic("transaction_cancel failed");
+ smb_panic("tdbsam_convert: transaction_cancel failed");
}
return false;
@@ -262,17 +412,54 @@ static bool tdbsam_open( const char *name )
}
if ( version < TDBSAM_VERSION ) {
- DEBUG(1, ("tdbsam_open: Converting version %d database to "
- "version %d.\n", version, TDBSAM_VERSION));
+ /*
+ * Ok - we think we're going to have to convert.
+ * Due to the backup process we now must do to
+ * upgrade we have to get a mutex and re-check
+ * the version. Someone else may have upgraded
+ * whilst we were checking.
+ */
+
+ struct named_mutex *mtx = grab_named_mutex(NULL,
+ "tdbsam_upgrade_mutex",
+ 600);
- if ( !tdbsam_convert(db_sam, version) ) {
- DEBUG(0, ("tdbsam_open: Error when trying to convert "
- "tdbsam [%s]\n",name));
+ if (!mtx) {
+ DEBUG(0, ("tdbsam_open: failed to grab mutex.\n"));
TALLOC_FREE(db_sam);
return false;
}
- DEBUG(3, ("TDBSAM converted successfully.\n"));
+ /* Re-check the version */
+ version = dbwrap_fetch_int32(db_sam, TDBSAM_VERSION_STRING);
+ if (version == -1) {
+ version = 0; /* Version not found, assume version 0 */
+ }
+
+ /* Compare the version */
+ if (version > TDBSAM_VERSION) {
+ /* Version more recent than the latest known */
+ DEBUG(0, ("tdbsam_open: unknown version => %d\n", version));
+ TALLOC_FREE(db_sam);
+ TALLOC_FREE(mtx);
+ return false;
+ }
+
+ if ( version < TDBSAM_VERSION ) {
+ DEBUG(1, ("tdbsam_open: Converting version %d database to "
+ "version %d.\n", version, TDBSAM_VERSION));
+
+ if ( !tdbsam_convert(&db_sam, name, version) ) {
+ DEBUG(0, ("tdbsam_open: Error when trying to convert "
+ "tdbsam [%s]\n",name));
+ TALLOC_FREE(db_sam);
+ TALLOC_FREE(mtx);
+ return false;
+ }
+
+ DEBUG(3, ("TDBSAM converted successfully.\n"));
+ }
+ TALLOC_FREE(mtx);
}
DEBUG(4,("tdbsam_open: successfully opened %s\n", name ));
generated by cgit (git 2.34.1) at 2024-11-24 06:05:43 +0000