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Reintroduce MAINTAIN privilege and pg_maintain predefined role.

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Roles with MAINTAIN on a relation may run VACUUM, ANALYZE, REINDEX,
REFRESH MATERIALIZE VIEW, CLUSTER, and LOCK TABLE on the relation.
Roles with privileges of pg_maintain may run those same commands on
all relations.

This was previously committed for v16, but it was reverted in
commit 151c22deee due to concerns about search_path tricks that
could be used to escalate privileges to the table owner.  Commits
2af07e2f74, 59825d1639, and c7ea3f4229 resolved these concerns by
restricting search_path when running maintenance commands.

Bumps catversion.

Reviewed-by: Jeff Davis
Discussion: https://postgr.es/m/20240305161235.GA3478007%40nathanxps13
This commit is contained in:
Nathan Bossart
2024-03-13 14:49:26 -05:00
parent 2041bc4276
commit ecb0fd3372
42 changed files with 457 additions and 180 deletions
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2
src/backend/commands/lockcmds.c
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@@ -283,7 +283,7 @@ LockTableAclCheck(Oid reloid, LOCKMODE lockmode, Oid userid)
AclMode aclmask;
/* any of these privileges permit any lock mode */
aclmask = ACL_UPDATE | ACL_DELETE | ACL_TRUNCATE;
aclmask = ACL_MAINTAIN | ACL_UPDATE | ACL_DELETE | ACL_TRUNCATE;
/* SELECT privileges also permit ACCESS SHARE and below */
if (lockmode <= AccessShareLock)