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7e735035f2
The basic rule we follow here is to always first include 'postgres.h' or 'postgres_fe.h' whichever is applicable, then system header includes and then Postgres header includes. In this, we also follow that all the Postgres header includes are in order based on their ASCII value. We generally follow these rules, but the code has deviated in many places. This commit makes it consistent just for contrib modules. The later commits will enforce similar rules in other parts of code. Author: Vignesh C Reviewed-by: Amit Kapila Discussion: https://postgr.es/m/CALDaNm2Sznv8RR6Ex-iJO6xAdsxgWhCoETkaYX=+9DW3q0QCfA@mail.gmail.com
364 lines
9.0 KiB
C
364 lines
9.0 KiB
C
/* -------------------------------------------------------------------------
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*
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* contrib/sepgsql/dml.c
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*
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* Routines to handle DML permission checks
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*
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* Copyright (c) 2010-2019, PostgreSQL Global Development Group
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*
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* -------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/htup_details.h"
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#include "access/sysattr.h"
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#include "access/tupdesc.h"
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#include "catalog/catalog.h"
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#include "catalog/dependency.h"
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#include "catalog/heap.h"
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#include "catalog/pg_attribute.h"
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#include "catalog/pg_class.h"
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#include "catalog/pg_inherits.h"
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#include "commands/seclabel.h"
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#include "commands/tablecmds.h"
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#include "executor/executor.h"
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#include "nodes/bitmapset.h"
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#include "sepgsql.h"
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#include "utils/lsyscache.h"
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#include "utils/syscache.h"
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/*
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* fixup_whole_row_references
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*
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* When user reference a whole of row, it is equivalent to reference to
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* all the user columns (not system columns). So, we need to fix up the
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* given bitmapset, if it contains a whole of the row reference.
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*/
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static Bitmapset *
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fixup_whole_row_references(Oid relOid, Bitmapset *columns)
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{
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Bitmapset *result;
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HeapTuple tuple;
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AttrNumber natts;
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AttrNumber attno;
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int index;
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/* if no whole of row references, do not anything */
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index = InvalidAttrNumber - FirstLowInvalidHeapAttributeNumber;
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if (!bms_is_member(index, columns))
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return columns;
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/* obtain number of attributes */
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tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relOid));
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if (!HeapTupleIsValid(tuple))
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elog(ERROR, "cache lookup failed for relation %u", relOid);
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natts = ((Form_pg_class) GETSTRUCT(tuple))->relnatts;
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ReleaseSysCache(tuple);
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/* fix up the given columns */
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result = bms_copy(columns);
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result = bms_del_member(result, index);
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for (attno = 1; attno <= natts; attno++)
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{
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tuple = SearchSysCache2(ATTNUM,
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ObjectIdGetDatum(relOid),
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Int16GetDatum(attno));
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if (!HeapTupleIsValid(tuple))
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continue;
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if (((Form_pg_attribute) GETSTRUCT(tuple))->attisdropped)
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continue;
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index = attno - FirstLowInvalidHeapAttributeNumber;
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result = bms_add_member(result, index);
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ReleaseSysCache(tuple);
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}
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return result;
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}
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/*
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* fixup_inherited_columns
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*
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* When user is querying on a table with children, it implicitly accesses
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* child tables also. So, we also need to check security label of child
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* tables and columns, but here is no guarantee attribute numbers are
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* same between the parent ans children.
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* It returns a bitmapset which contains attribute number of the child
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* table based on the given bitmapset of the parent.
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*/
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static Bitmapset *
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fixup_inherited_columns(Oid parentId, Oid childId, Bitmapset *columns)
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{
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Bitmapset *result = NULL;
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int index;
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/*
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* obviously, no need to do anything here
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*/
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if (parentId == childId)
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return columns;
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index = -1;
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while ((index = bms_next_member(columns, index)) >= 0)
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{
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/* bit numbers are offset by FirstLowInvalidHeapAttributeNumber */
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AttrNumber attno = index + FirstLowInvalidHeapAttributeNumber;
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char *attname;
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/*
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* whole-row-reference shall be fixed-up later
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*/
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if (attno == InvalidAttrNumber)
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{
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result = bms_add_member(result, index);
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continue;
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}
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attname = get_attname(parentId, attno, false);
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attno = get_attnum(childId, attname);
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if (attno == InvalidAttrNumber)
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elog(ERROR, "cache lookup failed for attribute %s of relation %u",
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attname, childId);
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result = bms_add_member(result,
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attno - FirstLowInvalidHeapAttributeNumber);
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pfree(attname);
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}
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return result;
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}
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/*
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* check_relation_privileges
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*
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* It actually checks required permissions on a certain relation
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* and its columns.
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*/
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static bool
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check_relation_privileges(Oid relOid,
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Bitmapset *selected,
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Bitmapset *inserted,
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Bitmapset *updated,
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uint32 required,
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bool abort_on_violation)
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{
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ObjectAddress object;
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char *audit_name;
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Bitmapset *columns;
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int index;
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char relkind = get_rel_relkind(relOid);
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bool result = true;
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/*
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* Hardwired Policies: SE-PostgreSQL enforces - clients cannot modify
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* system catalogs using DMLs - clients cannot reference/modify toast
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* relations using DMLs
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*/
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if (sepgsql_getenforce() > 0)
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{
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if ((required & (SEPG_DB_TABLE__UPDATE |
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SEPG_DB_TABLE__INSERT |
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SEPG_DB_TABLE__DELETE)) != 0 &&
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IsCatalogRelationOid(relOid))
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ereport(ERROR,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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errmsg("SELinux: hardwired security policy violation")));
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if (relkind == RELKIND_TOASTVALUE)
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ereport(ERROR,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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errmsg("SELinux: hardwired security policy violation")));
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}
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/*
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* Check permissions on the relation
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*/
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object.classId = RelationRelationId;
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object.objectId = relOid;
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object.objectSubId = 0;
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audit_name = getObjectIdentity(&object);
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switch (relkind)
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{
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case RELKIND_RELATION:
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case RELKIND_PARTITIONED_TABLE:
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result = sepgsql_avc_check_perms(&object,
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SEPG_CLASS_DB_TABLE,
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required,
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audit_name,
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abort_on_violation);
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break;
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case RELKIND_SEQUENCE:
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Assert((required & ~SEPG_DB_TABLE__SELECT) == 0);
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if (required & SEPG_DB_TABLE__SELECT)
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result = sepgsql_avc_check_perms(&object,
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SEPG_CLASS_DB_SEQUENCE,
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SEPG_DB_SEQUENCE__GET_VALUE,
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audit_name,
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abort_on_violation);
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break;
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case RELKIND_VIEW:
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result = sepgsql_avc_check_perms(&object,
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SEPG_CLASS_DB_VIEW,
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SEPG_DB_VIEW__EXPAND,
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audit_name,
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abort_on_violation);
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break;
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default:
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/* nothing to be checked */
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break;
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}
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pfree(audit_name);
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/*
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* Only columns owned by relations shall be checked
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*/
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if (relkind != RELKIND_RELATION && relkind != RELKIND_PARTITIONED_TABLE)
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return true;
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/*
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* Check permissions on the columns
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*/
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selected = fixup_whole_row_references(relOid, selected);
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inserted = fixup_whole_row_references(relOid, inserted);
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updated = fixup_whole_row_references(relOid, updated);
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columns = bms_union(selected, bms_union(inserted, updated));
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while ((index = bms_first_member(columns)) >= 0)
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{
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AttrNumber attnum;
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uint32 column_perms = 0;
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if (bms_is_member(index, selected))
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column_perms |= SEPG_DB_COLUMN__SELECT;
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if (bms_is_member(index, inserted))
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{
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if (required & SEPG_DB_TABLE__INSERT)
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column_perms |= SEPG_DB_COLUMN__INSERT;
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}
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if (bms_is_member(index, updated))
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{
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if (required & SEPG_DB_TABLE__UPDATE)
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column_perms |= SEPG_DB_COLUMN__UPDATE;
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}
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if (column_perms == 0)
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continue;
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/* obtain column's permission */
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attnum = index + FirstLowInvalidHeapAttributeNumber;
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object.classId = RelationRelationId;
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object.objectId = relOid;
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object.objectSubId = attnum;
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audit_name = getObjectDescription(&object);
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result = sepgsql_avc_check_perms(&object,
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SEPG_CLASS_DB_COLUMN,
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column_perms,
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audit_name,
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abort_on_violation);
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pfree(audit_name);
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if (!result)
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return result;
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}
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return true;
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}
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/*
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* sepgsql_dml_privileges
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*
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* Entrypoint of the DML permission checks
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*/
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bool
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sepgsql_dml_privileges(List *rangeTabls, bool abort_on_violation)
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{
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ListCell *lr;
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foreach(lr, rangeTabls)
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{
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RangeTblEntry *rte = lfirst(lr);
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uint32 required = 0;
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List *tableIds;
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ListCell *li;
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/*
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* Only regular relations shall be checked
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*/
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if (rte->rtekind != RTE_RELATION)
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continue;
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/*
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* Find out required permissions
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*/
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if (rte->requiredPerms & ACL_SELECT)
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required |= SEPG_DB_TABLE__SELECT;
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if (rte->requiredPerms & ACL_INSERT)
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required |= SEPG_DB_TABLE__INSERT;
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if (rte->requiredPerms & ACL_UPDATE)
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{
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if (!bms_is_empty(rte->updatedCols))
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required |= SEPG_DB_TABLE__UPDATE;
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else
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required |= SEPG_DB_TABLE__LOCK;
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}
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if (rte->requiredPerms & ACL_DELETE)
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required |= SEPG_DB_TABLE__DELETE;
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/*
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* Skip, if nothing to be checked
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*/
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if (required == 0)
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continue;
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/*
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* If this RangeTblEntry is also supposed to reference inherited
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* tables, we need to check security label of the child tables. So, we
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* expand rte->relid into list of OIDs of inheritance hierarchy, then
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* checker routine will be invoked for each relations.
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*/
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if (!rte->inh)
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tableIds = list_make1_oid(rte->relid);
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else
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tableIds = find_all_inheritors(rte->relid, NoLock, NULL);
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foreach(li, tableIds)
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{
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Oid tableOid = lfirst_oid(li);
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Bitmapset *selectedCols;
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Bitmapset *insertedCols;
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Bitmapset *updatedCols;
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/*
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* child table has different attribute numbers, so we need to fix
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* up them.
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*/
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selectedCols = fixup_inherited_columns(rte->relid, tableOid,
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rte->selectedCols);
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insertedCols = fixup_inherited_columns(rte->relid, tableOid,
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rte->insertedCols);
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updatedCols = fixup_inherited_columns(rte->relid, tableOid,
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rte->updatedCols);
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/*
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* check permissions on individual tables
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*/
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if (!check_relation_privileges(tableOid,
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selectedCols,
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insertedCols,
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updatedCols,
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required, abort_on_violation))
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return false;
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}
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list_free(tableIds);
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}
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return true;
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}
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