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Use GRANT system to manage access to sensitive functions

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Now that pg_dump will properly dump out any ACL changes made to
functions which exist in pg_catalog, switch to using the GRANT system
to manage access to those functions.

This means removing 'if (!superuser()) ereport()' checks from the
functions themselves and then REVOKEing EXECUTE right from 'public' for
these functions in system_views.sql.

Reviews by Alexander Korotkov, Jose Luis Tallon
This commit is contained in:
Stephen Frost
2016-04-06 21:45:32 -04:00
parent 23f34fa4ba
commit 1574783b4c
7 changed files with 81 additions and 75 deletions
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56
src/backend/access/transam/xlogfuncs.c
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@ -66,6 +66,9 @@ nonexclusive_base_backup_cleanup(int code, Datum arg)
* contains the user-supplied label string (typically this would be used
* to tell where the backup dump will be stored) and the starting time and
* starting WAL location for the dump.
*
* Permission checking for this function is managed through the normal
* GRANT system.
*/
Datum
pg_start_backup(PG_FUNCTION_ARGS)
@ -79,11 +82,6 @@ pg_start_backup(PG_FUNCTION_ARGS)
backupidstr = text_to_cstring(backupid);
if (!superuser() && !has_rolreplication(GetUserId()))
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("must be superuser or replication role to run a backup")));
if (exclusive_backup_running || nonexclusive_backup_running)
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
@ -142,17 +140,15 @@ pg_start_backup(PG_FUNCTION_ARGS)
* Note: this version is only called to stop an exclusive backup. The function
* pg_stop_backup_v2 (overloaded as pg_stop_backup in SQL) is called to
* stop non-exclusive backups.
*
* Permission checking for this function is managed through the normal
* GRANT system.
*/
Datum
pg_stop_backup(PG_FUNCTION_ARGS)
{
XLogRecPtr stoppoint;
if (!superuser() && !has_rolreplication(GetUserId()))
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("must be superuser or replication role to run a backup"))));
if (nonexclusive_backup_running)
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
@ -179,6 +175,9 @@ pg_stop_backup(PG_FUNCTION_ARGS)
* Works the same as pg_stop_backup, except for non-exclusive backups it returns
* the backup label and tablespace map files as text fields in as part of the
* resultset.
*
* Permission checking for this function is managed through the normal
* GRANT system.
*/
Datum
pg_stop_backup_v2(PG_FUNCTION_ARGS)
@ -205,11 +204,6 @@ pg_stop_backup_v2(PG_FUNCTION_ARGS)
errmsg("materialize mode required, but it is not " \
"allowed in this context")));
if (!superuser() && !has_rolreplication(GetUserId()))
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("must be superuser or replication role to run a backup"))));
/* Build a tuple descriptor for our result type */
if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
elog(ERROR, "return type must be a row type");
@ -285,17 +279,15 @@ pg_stop_backup_v2(PG_FUNCTION_ARGS)
/*
* pg_switch_xlog: switch to next xlog file
*
* Permission checking for this function is managed through the normal
* GRANT system.
*/
Datum
pg_switch_xlog(PG_FUNCTION_ARGS)
{
XLogRecPtr switchpoint;
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("must be superuser to switch transaction log files"))));
if (RecoveryInProgress())
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
@ -312,6 +304,9 @@ pg_switch_xlog(PG_FUNCTION_ARGS)
/*
* pg_create_restore_point: a named point for restore
*
* Permission checking for this function is managed through the normal
* GRANT system.
*/
Datum
pg_create_restore_point(PG_FUNCTION_ARGS)
@ -320,11 +315,6 @@ pg_create_restore_point(PG_FUNCTION_ARGS)
char *restore_name_str;
XLogRecPtr restorepoint;
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("must be superuser to create a restore point"))));
if (RecoveryInProgress())
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
@ -546,15 +536,13 @@ pg_xlogfile_name(PG_FUNCTION_ARGS)
/*
* pg_xlog_replay_pause - pause recovery now
*
* Permission checking for this function is managed through the normal
* GRANT system.
*/
Datum
pg_xlog_replay_pause(PG_FUNCTION_ARGS)
{
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("must be superuser to control recovery"))));
if (!RecoveryInProgress())
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
@ -568,15 +556,13 @@ pg_xlog_replay_pause(PG_FUNCTION_ARGS)
/*
* pg_xlog_replay_resume - resume recovery now
*
* Permission checking for this function is managed through the normal
* GRANT system.
*/
Datum
pg_xlog_replay_resume(PG_FUNCTION_ARGS)
{
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("must be superuser to control recovery"))));
if (!RecoveryInProgress())
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),