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Adjust permissions checking for ALTER OWNER commands: instead of

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requiring superuserness always, allow an owner to reassign ownership
to any role he is a member of, if that role would have the right to
create a similar object.  These three requirements essentially state
that the would-be alterer has enough privilege to DROP the existing
object and then re-CREATE it as the new role; so we might as well
let him do it in one step.  The ALTER TABLESPACE case is a bit
squirrely, but the whole concept of non-superuser tablespace owners
is pretty dubious anyway.  Stephen Frost, code review by Tom Lane.
This commit is contained in:
Tom Lane
2005-07-14 21:46:30 +00:00
parent bd15782164
commit aa1110624c
12 changed files with 229 additions and 109 deletions
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23
src/backend/commands/tablecmds.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.163 2005/07/07 20:39:58 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.164 2005/07/14 21:46:29 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -5286,12 +5286,23 @@ ATExecChangeOwner(Oid relationOid, Oid newOwnerId)
Datum aclDatum;
bool isNull;
HeapTuple newtuple;
Oid namespaceOid = tuple_class->relnamespace;
AclResult aclresult;
/* Otherwise, check that we are the superuser */
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("must be superuser to change owner")));
/* Otherwise, must be owner of the existing object */
if (!pg_class_ownercheck(relationOid,GetUserId()))
aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_CLASS,
RelationGetRelationName(target_rel));
/* Must be able to become new owner */
check_is_member_of_role(GetUserId(), newOwnerId);
/* New owner must have CREATE privilege on namespace */
aclresult = pg_namespace_aclcheck(namespaceOid, newOwnerId,
ACL_CREATE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
get_namespace_name(namespaceOid));
memset(repl_null, ' ', sizeof(repl_null));
memset(repl_repl, ' ', sizeof(repl_repl));