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Centralize DML permissions-checking logic.
Remove bespoke code in DoCopy and RI_Initial_Check, which now instead fabricate call ExecCheckRTPerms with a manufactured RangeTblEntry. This is intended to make it feasible for an enhanced security provider to actually make use of ExecutorCheckPerms_hook, but also has the advantage that RI_Initial_Check can allow use of the fast-path when column-level but not table-level permissions are present. KaiGai Kohei. Reviewed (in an earlier version) by Stephen Frost, and by me. Some further changes to the comments by me.
This commit is contained in:
Robert Haas
parent
9f8cf32b34
commit
b8c6c71d1c
@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/commands/copy.c,v 1.327 2010/04/28 16:10:41 heikki Exp $
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* $PostgreSQL: pgsql/src/backend/commands/copy.c,v 1.328 2010/07/22 00:47:52 rhaas Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -21,6 +21,7 @@
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#include <arpa/inet.h>
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#include "access/heapam.h"
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#include "access/sysattr.h"
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#include "access/xact.h"
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#include "catalog/namespace.h"
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#include "catalog/pg_type.h"
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@ -726,8 +727,6 @@ DoCopy(const CopyStmt *stmt, const char *queryString)
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bool force_quote_all = false;
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bool format_specified = false;
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AclMode required_access = (is_from ? ACL_INSERT : ACL_SELECT);
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AclMode relPerms;
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AclMode remainingPerms;
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ListCell *option;
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TupleDesc tupDesc;
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int num_phys_attrs;
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@ -988,6 +987,10 @@ DoCopy(const CopyStmt *stmt, const char *queryString)
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if (stmt->relation)
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{
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RangeTblEntry *rte;
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List *attnums;
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ListCell *cur;
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Assert(!stmt->query);
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cstate->queryDesc = NULL;
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@ -998,28 +1001,22 @@ DoCopy(const CopyStmt *stmt, const char *queryString)
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tupDesc = RelationGetDescr(cstate->rel);
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/* Check relation permissions. */
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relPerms = pg_class_aclmask(RelationGetRelid(cstate->rel), GetUserId(),
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required_access, ACLMASK_ALL);
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remainingPerms = required_access & ~relPerms;
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if (remainingPerms != 0)
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rte = makeNode(RangeTblEntry);
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rte->rtekind = RTE_RELATION;
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rte->relid = RelationGetRelid(cstate->rel);
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rte->requiredPerms = required_access;
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attnums = CopyGetAttnums(tupDesc, cstate->rel, attnamelist);
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foreach (cur, attnums)
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{
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/* We don't have table permissions, check per-column permissions */
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List *attnums;
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ListCell *cur;
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int attno = lfirst_int(cur) - FirstLowInvalidHeapAttributeNumber;
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attnums = CopyGetAttnums(tupDesc, cstate->rel, attnamelist);
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foreach(cur, attnums)
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{
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int attnum = lfirst_int(cur);
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if (pg_attribute_aclcheck(RelationGetRelid(cstate->rel),
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attnum,
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GetUserId(),
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remainingPerms) != ACLCHECK_OK)
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aclcheck_error(ACLCHECK_NO_PRIV, ACL_KIND_CLASS,
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RelationGetRelationName(cstate->rel));
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}
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if (is_from)
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rte->modifiedCols = bms_add_member(rte->modifiedCols, attno);
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else
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rte->selectedCols = bms_add_member(rte->selectedCols, attno);
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}
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ExecCheckRTPerms(list_make1(rte), true);
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/* check read-only transaction */
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if (XactReadOnly && is_from && !cstate->rel->rd_islocaltemp)
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@ -26,7 +26,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.351 2010/07/12 17:01:05 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.352 2010/07/22 00:47:52 rhaas Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -75,8 +75,7 @@ static void ExecutePlan(EState *estate, PlanState *planstate,
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long numberTuples,
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ScanDirection direction,
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DestReceiver *dest);
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static void ExecCheckRTPerms(List *rangeTable);
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static void ExecCheckRTEPerms(RangeTblEntry *rte);
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static bool ExecCheckRTEPerms(RangeTblEntry *rte);
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static void ExecCheckXactReadOnly(PlannedStmt *plannedstmt);
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static void EvalPlanQualStart(EPQState *epqstate, EState *parentestate,
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Plan *planTree);
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@ -409,26 +408,42 @@ ExecutorRewind(QueryDesc *queryDesc)
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/*
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* ExecCheckRTPerms
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* Check access permissions for all relations listed in a range table.
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*
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* Returns true if permissions are adequate. Otherwise, throws an appropriate
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* error if ereport_on_violation is true, or simply returns false otherwise.
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*/
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static void
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ExecCheckRTPerms(List *rangeTable)
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bool
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ExecCheckRTPerms(List *rangeTable, bool ereport_on_violation)
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{
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ListCell *l;
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bool result = true;
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foreach(l, rangeTable)
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{
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ExecCheckRTEPerms((RangeTblEntry *) lfirst(l));
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RangeTblEntry *rte = (RangeTblEntry *) lfirst(l);
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result = ExecCheckRTEPerms(rte);
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if (!result)
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{
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Assert(rte->rtekind == RTE_RELATION);
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if (ereport_on_violation)
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aclcheck_error(ACLCHECK_NO_PRIV, ACL_KIND_CLASS,
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get_rel_name(rte->relid));
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return false;
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}
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}
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if (ExecutorCheckPerms_hook)
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(*ExecutorCheckPerms_hook)(rangeTable);
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result = (*ExecutorCheckPerms_hook)(rangeTable,
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ereport_on_violation);
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return result;
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}
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/*
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* ExecCheckRTEPerms
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* Check access permissions for a single RTE.
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*/
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static void
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static bool
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ExecCheckRTEPerms(RangeTblEntry *rte)
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{
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AclMode requiredPerms;
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@ -445,14 +460,14 @@ ExecCheckRTEPerms(RangeTblEntry *rte)
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* Join, subquery, and special RTEs need no checks.
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*/
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if (rte->rtekind != RTE_RELATION)
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return;
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return true;
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/*
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* No work if requiredPerms is empty.
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*/
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requiredPerms = rte->requiredPerms;
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if (requiredPerms == 0)
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return;
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return true;
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relOid = rte->relid;
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@ -480,8 +495,7 @@ ExecCheckRTEPerms(RangeTblEntry *rte)
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* we can fail straight away.
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*/
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if (remainingPerms & ~(ACL_SELECT | ACL_INSERT | ACL_UPDATE))
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aclcheck_error(ACLCHECK_NO_PRIV, ACL_KIND_CLASS,
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get_rel_name(relOid));
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return false;
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/*
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* Check to see if we have the needed privileges at column level.
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@ -501,8 +515,7 @@ ExecCheckRTEPerms(RangeTblEntry *rte)
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{
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if (pg_attribute_aclcheck_all(relOid, userid, ACL_SELECT,
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ACLMASK_ANY) != ACLCHECK_OK)
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aclcheck_error(ACLCHECK_NO_PRIV, ACL_KIND_CLASS,
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get_rel_name(relOid));
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return false;
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}
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tmpset = bms_copy(rte->selectedCols);
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@ -515,15 +528,13 @@ ExecCheckRTEPerms(RangeTblEntry *rte)
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/* Whole-row reference, must have priv on all cols */
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if (pg_attribute_aclcheck_all(relOid, userid, ACL_SELECT,
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ACLMASK_ALL) != ACLCHECK_OK)
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aclcheck_error(ACLCHECK_NO_PRIV, ACL_KIND_CLASS,
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get_rel_name(relOid));
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return false;
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}
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else
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{
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if (pg_attribute_aclcheck(relOid, col, userid, ACL_SELECT)
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!= ACLCHECK_OK)
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aclcheck_error(ACLCHECK_NO_PRIV, ACL_KIND_CLASS,
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get_rel_name(relOid));
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if (pg_attribute_aclcheck(relOid, col, userid,
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ACL_SELECT) != ACLCHECK_OK)
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return false;
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}
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}
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bms_free(tmpset);
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@ -546,8 +557,7 @@ ExecCheckRTEPerms(RangeTblEntry *rte)
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{
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if (pg_attribute_aclcheck_all(relOid, userid, remainingPerms,
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ACLMASK_ANY) != ACLCHECK_OK)
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aclcheck_error(ACLCHECK_NO_PRIV, ACL_KIND_CLASS,
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get_rel_name(relOid));
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return false;
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}
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tmpset = bms_copy(rte->modifiedCols);
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@ -562,15 +572,15 @@ ExecCheckRTEPerms(RangeTblEntry *rte)
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}
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else
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{
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if (pg_attribute_aclcheck(relOid, col, userid, remainingPerms)
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!= ACLCHECK_OK)
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aclcheck_error(ACLCHECK_NO_PRIV, ACL_KIND_CLASS,
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get_rel_name(relOid));
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if (pg_attribute_aclcheck(relOid, col, userid,
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remainingPerms) != ACLCHECK_OK)
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return false;
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}
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}
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bms_free(tmpset);
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}
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}
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return true;
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}
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/*
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@ -636,7 +646,7 @@ InitPlan(QueryDesc *queryDesc, int eflags)
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/*
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* Do permissions checks
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*/
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ExecCheckRTPerms(rangeTable);
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ExecCheckRTPerms(rangeTable, true);
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/*
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* initialize the node's execution state
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@ -15,7 +15,7 @@
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*
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* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/backend/utils/adt/ri_triggers.c,v 1.118 2010/02/14 18:42:16 rhaas Exp $
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* $PostgreSQL: pgsql/src/backend/utils/adt/ri_triggers.c,v 1.119 2010/07/22 00:47:52 rhaas Exp $
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*
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* ----------
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*/
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@ -31,10 +31,12 @@
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#include "postgres.h"
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#include "access/xact.h"
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#include "access/sysattr.h"
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#include "catalog/pg_constraint.h"
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#include "catalog/pg_operator.h"
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#include "catalog/pg_type.h"
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#include "commands/trigger.h"
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#include "executor/executor.h"
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#include "executor/spi.h"
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#include "parser/parse_coerce.h"
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#include "parser/parse_relation.h"
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@ -2624,6 +2626,8 @@ RI_Initial_Check(Trigger *trigger, Relation fk_rel, Relation pk_rel)
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char fkrelname[MAX_QUOTED_REL_NAME_LEN];
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char pkattname[MAX_QUOTED_NAME_LEN + 3];
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char fkattname[MAX_QUOTED_NAME_LEN + 3];
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RangeTblEntry *pkrte;
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RangeTblEntry *fkrte;
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const char *sep;
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int i;
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int old_work_mem;
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@ -2631,6 +2635,9 @@ RI_Initial_Check(Trigger *trigger, Relation fk_rel, Relation pk_rel)
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int spi_result;
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SPIPlanPtr qplan;
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/* Fetch constraint info. */
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ri_FetchConstraintInfo(&riinfo, trigger, fk_rel, false);
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/*
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* Check to make sure current user has enough permissions to do the test
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* query. (If not, caller can fall back to the trigger method, which
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@ -2638,12 +2645,29 @@ RI_Initial_Check(Trigger *trigger, Relation fk_rel, Relation pk_rel)
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*
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* XXX are there any other show-stopper conditions to check?
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*/
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if (pg_class_aclcheck(RelationGetRelid(fk_rel), GetUserId(), ACL_SELECT) != ACLCHECK_OK)
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return false;
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if (pg_class_aclcheck(RelationGetRelid(pk_rel), GetUserId(), ACL_SELECT) != ACLCHECK_OK)
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return false;
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pkrte = makeNode(RangeTblEntry);
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pkrte->rtekind = RTE_RELATION;
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pkrte->relid = RelationGetRelid(pk_rel);
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pkrte->requiredPerms = ACL_SELECT;
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ri_FetchConstraintInfo(&riinfo, trigger, fk_rel, false);
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fkrte = makeNode(RangeTblEntry);
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fkrte->rtekind = RTE_RELATION;
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fkrte->relid = RelationGetRelid(fk_rel);
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fkrte->requiredPerms = ACL_SELECT;
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for (i = 0; i < riinfo.nkeys; i++)
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{
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int attno;
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attno = riinfo.pk_attnums[i] - FirstLowInvalidHeapAttributeNumber;
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pkrte->selectedCols = bms_add_member(pkrte->selectedCols, attno);
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attno = riinfo.fk_attnums[i] - FirstLowInvalidHeapAttributeNumber;
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fkrte->selectedCols = bms_add_member(fkrte->selectedCols, attno);
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}
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if (!ExecCheckRTPerms(list_make2(fkrte, pkrte), false))
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return false;
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/*----------
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* The query string built is:
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/executor/executor.h,v 1.170 2010/07/12 17:01:06 tgl Exp $
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* $PostgreSQL: pgsql/src/include/executor/executor.h,v 1.171 2010/07/22 00:47:59 rhaas Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -75,7 +75,7 @@ typedef void (*ExecutorEnd_hook_type) (QueryDesc *queryDesc);
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extern PGDLLIMPORT ExecutorEnd_hook_type ExecutorEnd_hook;
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/* Hook for plugins to get control in ExecCheckRTPerms() */
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typedef void (*ExecutorCheckPerms_hook_type) (List *);
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typedef bool (*ExecutorCheckPerms_hook_type) (List *, bool);
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extern PGDLLIMPORT ExecutorCheckPerms_hook_type ExecutorCheckPerms_hook;
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@ -161,6 +161,7 @@ extern void standard_ExecutorRun(QueryDesc *queryDesc,
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extern void ExecutorEnd(QueryDesc *queryDesc);
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extern void standard_ExecutorEnd(QueryDesc *queryDesc);
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extern void ExecutorRewind(QueryDesc *queryDesc);
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extern bool ExecCheckRTPerms(List *rangeTable, bool ereport_on_violation);
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extern void InitResultRelInfo(ResultRelInfo *resultRelInfo,
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Relation resultRelationDesc,
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Index resultRelationIndex,
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