Support DB encryption

servers/slapd/back-bdb/back-bdb.h

@@ -235,6 +235,8 @@ struct bdb_info {
 	alock_info_t	bi_alock_info;
 	char		*bi_db_config_path;
 	BerVarray	bi_db_config;
+	char		*bi_db_crypt_file;
+	struct berval	bi_db_crypt_key;
 	bdb_monitor_t	bi_monitor;
 
 #ifdef BDB_MONITOR_IDX

servers/slapd/back-bdb/config.c

@@ -42,6 +42,8 @@ static ConfigDriver bdb_cf_gen;
 enum {
 	BDB_CHKPT = 1,
 	BDB_CONFIG,
+	BDB_CRYPTFILE,
+	BDB_CRYPTKEY,
 	BDB_DIRECTORY,
 	BDB_NOSYNC,
 	BDB_DIRTYR,
@@ -70,6 +72,14 @@ static ConfigTable bdbcfg[] = {
 		bdb_cf_gen, "( OLcfgDbAt:1.2 NAME 'olcDbCheckpoint' "
 			"DESC 'Database checkpoint interval in kbytes and minutes' "
 			"SYNTAX OMsDirectoryString SINGLE-VALUE )",NULL, NULL },
+	{ "cryptfile", "file", 2, 2, 0, ARG_STRING|ARG_MAGIC|BDB_CRYPTFILE,
+		bdb_cf_gen, "( OLcfgDbAt:1.13 NAME 'olcDbCryptFile' "
+			"DESC 'Pathname of file containing the DB encryption key' "
+			"SYNTAX OMsDirectoryString SINGLE-VALUE )",NULL, NULL },
+	{ "cryptkey", "key", 2, 2, 0, ARG_BERVAL|ARG_MAGIC|BDB_CRYPTKEY,
+		bdb_cf_gen, "( OLcfgDbAt:1.14 NAME 'olcDbCryptKey' "
+			"DESC 'DB encryption key' "
+			"SYNTAX OMsOctetString SINGLE-VALUE )",NULL, NULL },
 	{ "dbconfig", "DB_CONFIG setting", 1, 0, 0, ARG_MAGIC|BDB_CONFIG,
 		bdb_cf_gen, "( OLcfgDbAt:1.3 NAME 'olcDbConfig' "
 			"DESC 'BerkeleyDB DB_CONFIG configuration directives' "
@@ -143,6 +153,7 @@ static ConfigOCs bdbocs[] = {
 		"SUP olcDatabaseConfig "
 		"MUST olcDbDirectory "
 		"MAY ( olcDbCacheSize $ olcDbCheckpoint $ olcDbConfig $ "
+		"olcDbCryptFile $ olcDbCryptKey $ "
 		"olcDbNoSync $ olcDbDirtyRead $ olcDbIDLcacheSize $ "
 		"olcDbIndex $ olcDbLinearIndex $ olcDbLockDetect $ "
 		"olcDbMode $ olcDbSearchStack $ olcDbShmKey $ "
@@ -364,6 +375,25 @@ bdb_cf_gen( ConfigArgs *c )
 			}
 			break;
 
+		case BDB_CRYPTFILE:
+			if ( bdb->bi_db_crypt_file ) {
+				c->value_string = ch_strdup( bdb->bi_db_crypt_file );
+			} else {
+				rc = 1;
+			}
+			break;
+
+		/* If a crypt file has been set, its contents are copied here.
+		 * But we don't want the key to be incorporated here.
+		 */
+		case BDB_CRYPTKEY:
+			if ( !bdb->bi_db_crypt_file && !BER_BVISNULL( &bdb->bi_db_crypt_key )) {
+				value_add_one( &c->rvalue_vals, &bdb->bi_db_crypt_key );
+			} else {
+				rc = 1;
+			}
+			break;
+
 		case BDB_DIRECTORY:
 			if ( bdb->bi_dbenv_home ) {
 				c->value_string = ch_strdup( bdb->bi_dbenv_home );
@@ -472,6 +502,21 @@ bdb_cf_gen( ConfigArgs *c )
 			bdb->bi_flags |= BDB_UPD_CONFIG;
 			c->cleanup = bdb_cf_cleanup;
 			break;
+		/* Doesn't really make sense to change these on the fly;
+		 * the entire DB must be dumped and reloaded
+		 */
+		case BDB_CRYPTFILE:
+			if ( bdb->bi_db_crypt_file ) {
+				ch_free( bdb->bi_db_crypt_file );
+				bdb->bi_db_crypt_file = NULL;
+			}
+			/* FALLTHRU */
+		case BDB_CRYPTKEY:
+			if ( !BER_BVISNULL( &bdb->bi_db_crypt_key )) {
+				ch_free( bdb->bi_db_crypt_key.bv_val );
+				BER_BVZERO( &bdb->bi_db_crypt_key );
+			}
+			break;
 		case BDB_DIRECTORY:
 			bdb->bi_flags |= BDB_RE_OPEN;
 			bdb->bi_flags ^= BDB_HAS_CONFIG;
@@ -616,6 +661,22 @@ bdb_cf_gen( ConfigArgs *c )
 		}
 		break;
 
+	case BDB_CRYPTFILE:
+		rc = lutil_get_filed_password( c->value_string, &bdb->bi_db_crypt_key );
+		if ( rc == 0 ) {
+			bdb->bi_db_crypt_file = c->value_string;
+		}
+		break;
+
+	/* Cannot set key if file was already set */
+	case BDB_CRYPTKEY:
+		if ( bdb->bi_db_crypt_file ) {
+			rc = 1;
+		} else {
+			bdb->bi_db_crypt_key = c->value_bv;
+		}
+		break;
+
 	case BDB_DIRECTORY: {
 		FILE *f;
 		char *ptr, *testpath;

servers/slapd/back-bdb/dbcache.c

@@ -104,9 +104,23 @@ bdb_db_cache(
 			"bdb_db_cache: db_create(%s) failed: %s (%d)\n",
 			bdb->bi_dbenv_home, db_strerror(rc), rc );
 		ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
+		ch_free( db );
 		return rc;
 	}
 
+	if( !BER_BVISNULL( &bdb->bi_db_crypt_key )) {
+		rc = db->bdi_db->set_flags( db->bdi_db, DB_ENCRYPT );
+		if ( rc ) {
+			Debug( LDAP_DEBUG_ANY,
+				"bdb_db_cache: db set_flags(DB_ENCRYPT)(%s) failed: %s (%d)\n",
+				bdb->bi_dbenv_home, db_strerror(rc), rc );
+			ldap_pvt_thread_mutex_unlock( &bdb->bi_database_mutex );
+			db->bdi_db->close( db->bdi_db, 0 );
+			ch_free( db );
+			return rc;
+		}
+	}
+
 	rc = db->bdi_db->set_pagesize( db->bdi_db, BDB_PAGESIZE );
 #ifdef BDB_INDEX_USE_HASH
 	rc = db->bdi_db->set_h_hash( db->bdi_db, bdb_db_hash );

servers/slapd/back-bdb/init.c

@@ -279,6 +279,18 @@ shm_retry:
 
 	bdb->bi_dbenv->set_lk_detect( bdb->bi_dbenv, bdb->bi_lock_detect );
 
+	if ( !BER_BVISNULL( &bdb->bi_db_crypt_key )) {
+		rc = bdb->bi_dbenv->set_encrypt( bdb->bi_dbenv, bdb->bi_db_crypt_key.bv_val,
+			DB_ENCRYPT_AES );
+		if ( rc ) {
+			Debug( LDAP_DEBUG_ANY,
+				LDAP_XSTRING(bdb_db_open) ": database \"%s\": "
+				"dbenv set_encrypt failed: %s (%d).\n",
+				be->be_suffix[0].bv_val, db_strerror(rc), rc );
+			goto fail;
+		}
+	}
+
 	/* One long-lived TXN per thread, two TXNs per write op */
 	bdb->bi_dbenv->set_tx_max( bdb->bi_dbenv, connection_pool_max * 3 );
 
@@ -390,6 +402,20 @@ shm_retry:
 			goto fail;
 		}
 
+		if( !BER_BVISNULL( &bdb->bi_db_crypt_key )) {
+			rc = db->bdi_db->set_flags( db->bdi_db, DB_ENCRYPT );
+			if ( rc ) {
+				snprintf(cr->msg, sizeof(cr->msg),
+					"database \"%s\": db set_flags(DB_ENCRYPT)(%s) failed: %s (%d).",
+					be->be_suffix[0].bv_val, 
+					bdb->bi_dbenv_home, db_strerror(rc), rc );
+				Debug( LDAP_DEBUG_ANY,
+					LDAP_XSTRING(bdb_db_open) ": %s\n",
+					cr->msg, 0, 0 );
+				goto fail;
+			}
+		}
+
 		if( i == BDB_ID2ENTRY ) {
 			if ( slapMode & SLAP_TOOL_MODE )
 				db->bdi_db->mpf->set_priority( db->bdi_db->mpf,