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/* -------------------------------------------------------------------------
*
* contrib/sepgsql/label.c
*
* Routines corresponding to relation/attribute objects
*
* Copyright (c) 2010-2011, PostgreSQL Global Development Group
*
* -------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/genam.h"
#include "access/heapam.h"
#include "access/sysattr.h"
#include "catalog/indexing.h"
#include "catalog/dependency.h"
#include "catalog/pg_attribute.h"
#include "catalog/pg_class.h"
#include "catalog/pg_namespace.h"
#include "commands/seclabel.h"
#include "utils/fmgroids.h"
#include "utils/lsyscache.h"
#include "utils/tqual.h"
#include "sepgsql.h"
/*
* sepgsql_attribute_post_create
*
* This routine assigns a default security label on a newly defined
* column, using ALTER TABLE ... ADD COLUMN.
* Note that this routine is not invoked in the case of CREATE TABLE,
* although it also defines columns in addition to table.
*/
void
sepgsql_attribute_post_create(Oid relOid, AttrNumber attnum)
{
char *scontext = sepgsql_get_client_label();
char *tcontext;
char *ncontext;
ObjectAddress object;
/*
* Only attributes within regular relation have individual security
* labels.
*/
if (get_rel_relkind(relOid) != RELKIND_RELATION)
return;
/*
* Compute a default security label when we create a new procedure object
* under the specified namespace.
*/
scontext = sepgsql_get_client_label();
tcontext = sepgsql_get_label(RelationRelationId, relOid, 0);
ncontext = sepgsql_compute_create(scontext, tcontext,
SEPG_CLASS_DB_COLUMN);
/*
* Assign the default security label on a new procedure
*/
object.classId = RelationRelationId;
object.objectId = relOid;
object.objectSubId = attnum;
SetSecurityLabel(&object, SEPGSQL_LABEL_TAG, ncontext);
pfree(tcontext);
pfree(ncontext);
}
/*
* sepgsql_attribute_relabel
*
* It checks privileges to relabel the supplied column
* by the `seclabel'.
*/
void
sepgsql_attribute_relabel(Oid relOid, AttrNumber attnum,
const char *seclabel)
{
char *scontext = sepgsql_get_client_label();
char *tcontext;
char *audit_name;
ObjectAddress object;
if (get_rel_relkind(relOid) != RELKIND_RELATION)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("cannot set security label on non-regular columns")));
object.classId = RelationRelationId;
object.objectId = relOid;
object.objectSubId = attnum;
audit_name = getObjectDescription(&object);
/*
* check db_column:{setattr relabelfrom} permission
*/
tcontext = sepgsql_get_label(RelationRelationId, relOid, attnum);
sepgsql_check_perms(scontext,
tcontext,
SEPG_CLASS_DB_COLUMN,
SEPG_DB_COLUMN__SETATTR |
SEPG_DB_COLUMN__RELABELFROM,
audit_name,
true);
/*
* check db_column:{relabelto} permission
*/
sepgsql_check_perms(scontext,
seclabel,
SEPG_CLASS_DB_COLUMN,
SEPG_DB_PROCEDURE__RELABELTO,
audit_name,
true);
pfree(tcontext);
pfree(audit_name);
}
/*
* sepgsql_relation_post_create
*
* The post creation hook of relation/attribute
*/
void
sepgsql_relation_post_create(Oid relOid)
{
Relation rel;
ScanKeyData skey;
SysScanDesc sscan;
HeapTuple tuple;
Form_pg_class classForm;
ObjectAddress object;
uint16 tclass;
char *scontext; /* subject */
char *tcontext; /* schema */
char *rcontext; /* relation */
char *ccontext; /* column */
/*
* Fetch catalog record of the new relation. Because pg_class entry is not
* visible right now, we need to scan the catalog using SnapshotSelf.
*/
rel = heap_open(RelationRelationId, AccessShareLock);
ScanKeyInit(&skey,
ObjectIdAttributeNumber,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(relOid));
sscan = systable_beginscan(rel, ClassOidIndexId, true,
SnapshotSelf, 1, &skey);
tuple = systable_getnext(sscan);
if (!HeapTupleIsValid(tuple))
elog(ERROR, "catalog lookup failed for relation %u", relOid);
classForm = (Form_pg_class) GETSTRUCT(tuple);
if (classForm->relkind == RELKIND_RELATION)
tclass = SEPG_CLASS_DB_TABLE;
else if (classForm->relkind == RELKIND_SEQUENCE)
tclass = SEPG_CLASS_DB_SEQUENCE;
else if (classForm->relkind == RELKIND_VIEW)
tclass = SEPG_CLASS_DB_VIEW;
else
goto out; /* No need to assign individual labels */
/*
* Compute a default security label when we create a new relation object
* under the specified namespace.
*/
scontext = sepgsql_get_client_label();
tcontext = sepgsql_get_label(NamespaceRelationId,
classForm->relnamespace, 0);
rcontext = sepgsql_compute_create(scontext, tcontext, tclass);
/*
* Assign the default security label on the new relation
*/
object.classId = RelationRelationId;
object.objectId = relOid;
object.objectSubId = 0;
SetSecurityLabel(&object, SEPGSQL_LABEL_TAG, rcontext);
/*
* We also assigns a default security label on columns of the new regular
* tables.
*/
if (classForm->relkind == RELKIND_RELATION)
{
AttrNumber index;
ccontext = sepgsql_compute_create(scontext, rcontext,
SEPG_CLASS_DB_COLUMN);
for (index = FirstLowInvalidHeapAttributeNumber + 1;
index <= classForm->relnatts;
index++)
{
if (index == InvalidAttrNumber)
continue;
if (index == ObjectIdAttributeNumber && !classForm->relhasoids)
continue;
object.classId = RelationRelationId;
object.objectId = relOid;
object.objectSubId = index;
SetSecurityLabel(&object, SEPGSQL_LABEL_TAG, ccontext);
}
pfree(ccontext);
}
pfree(rcontext);
out:
systable_endscan(sscan);
heap_close(rel, AccessShareLock);
}
/*
* sepgsql_relation_relabel
*
* It checks privileges to relabel the supplied relation by the `seclabel'.
*/
void
sepgsql_relation_relabel(Oid relOid, const char *seclabel)
{
char *scontext = sepgsql_get_client_label();
char *tcontext;
char *audit_name;
char relkind;
uint16_t tclass = 0;
relkind = get_rel_relkind(relOid);
if (relkind == RELKIND_RELATION)
tclass = SEPG_CLASS_DB_TABLE;
else if (relkind == RELKIND_SEQUENCE)
tclass = SEPG_CLASS_DB_SEQUENCE;
else if (relkind == RELKIND_VIEW)
tclass = SEPG_CLASS_DB_VIEW;
else
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("cannot set security labels on relations except "
"for tables, sequences or views")));
audit_name = getObjectDescriptionOids(RelationRelationId, relOid);
/*
* check db_xxx:{setattr relabelfrom} permission
*/
tcontext = sepgsql_get_label(RelationRelationId, relOid, 0);
sepgsql_check_perms(scontext,
tcontext,
tclass,
SEPG_DB_TABLE__SETATTR |
SEPG_DB_TABLE__RELABELFROM,
audit_name,
true);
/*
* check db_xxx:{relabelto} permission
*/
sepgsql_check_perms(scontext,
seclabel,
tclass,
SEPG_DB_TABLE__RELABELTO,
audit_name,
true);
pfree(tcontext);
pfree(audit_name);
}
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