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sepgsql: Check CREATE permissions for some object types.

Browse Source 
KaiGai Kohei, reviewed by Dimitri Fontaine and me.
This commit is contained in:
Robert Haas
2011-12-21 09:12:43 -05:00
parent 7f0e4bb82e
commit e1042a3484
10 changed files with 606 additions and 83 deletions
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91
contrib/sepgsql/database.c
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@ -10,33 +10,100 @@
*/
#include "postgres.h"
#include "access/genam.h"
#include "access/heapam.h"
#include "access/sysattr.h"
#include "catalog/dependency.h"
#include "catalog/pg_database.h"
#include "catalog/indexing.h"
#include "commands/dbcommands.h"
#include "commands/seclabel.h"
#include "utils/fmgroids.h"
#include "utils/tqual.h"
#include "sepgsql.h"
/*
* sepgsql_database_post_create
*
* This routine assigns a default security label on a newly defined
* database, and check permission needed for its creation.
*/
void
sepgsql_database_post_create(Oid databaseId)
sepgsql_database_post_create(Oid databaseId, const char *dtemplate)
{
char *scontext = sepgsql_get_client_label();
char *tcontext;
char *ncontext;
ObjectAddress object;
Relation rel;
ScanKeyData skey;
SysScanDesc sscan;
HeapTuple tuple;
char *tcontext;
char *ncontext;
char audit_name[NAMEDATALEN + 20];
ObjectAddress object;
Form_pg_database datForm;
/*
* Oid of the source database is not saved in pg_database catalog,
* so we collect its identifier using contextual information.
* If NULL, its default is "template1" according to createdb().
*/
if (!dtemplate)
dtemplate = "template1";
object.classId = DatabaseRelationId;
object.objectId = get_database_oid(dtemplate, false);
object.objectSubId = 0;
tcontext = sepgsql_get_label(object.classId,
object.objectId,
object.objectSubId);
/*
* check db_database:{getattr} permission
*/
snprintf(audit_name, sizeof(audit_name), "database %s", dtemplate);
sepgsql_avc_check_perms_label(tcontext,
SEPG_CLASS_DB_DATABASE,
SEPG_DB_DATABASE__GETATTR,
audit_name,
true);
/*
* Compute a default security label of the newly created database
* based on a pair of security label of client and source database.
*
* XXX - Right now, this logic uses "template1" as its source, because
* here is no way to know the Oid of source database.
* XXX - uncoming version of libselinux supports to take object
* name to handle special treatment on default security label.
*/
object.classId = DatabaseRelationId;
object.objectId = TemplateDbOid;
object.objectSubId = 0;
tcontext = GetSecurityLabel(&object, SEPGSQL_LABEL_TAG);
rel = heap_open(DatabaseRelationId, AccessShareLock);
ncontext = sepgsql_compute_create(scontext, tcontext,
ScanKeyInit(&skey,
ObjectIdAttributeNumber,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(databaseId));
sscan = systable_beginscan(rel, DatabaseOidIndexId, true,
SnapshotSelf, 1, &skey);
tuple = systable_getnext(sscan);
if (!HeapTupleIsValid(tuple))
elog(ERROR, "catalog lookup failed for database %u", databaseId);
datForm = (Form_pg_database) GETSTRUCT(tuple);
ncontext = sepgsql_compute_create(sepgsql_get_client_label(),
tcontext,
SEPG_CLASS_DB_DATABASE);
/*
* check db_database:{create} permission
*/
snprintf(audit_name, sizeof(audit_name),
"database %s", NameStr(datForm->datname));
sepgsql_avc_check_perms_label(ncontext,
SEPG_CLASS_DB_DATABASE,
SEPG_DB_DATABASE__CREATE,
audit_name,
true);
systable_endscan(sscan);
heap_close(rel, AccessShareLock);
/*
* Assign the default security label on the new database