mirror of
https://github.com/postgres/postgres.git
synced 2025-06-03 00:02:26 -04:00
7854e07f25
This follows multiple complains from Peter Geoghegan, Andres Freund and Alvaro Herrera that this issue ought to be dug more before actually happening, if it happens. Discussion: https://postgr.es/m/20191226144606.GA5659@alvherre.pgsql
505 lines
14 KiB
C
505 lines
14 KiB
C
/* -------------------------------------------------------------------------
|
|
*
|
|
* seclabel.c
|
|
* routines to support security label feature.
|
|
*
|
|
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
* -------------------------------------------------------------------------
|
|
*/
|
|
#include "postgres.h"
|
|
|
|
#include "access/genam.h"
|
|
#include "access/htup_details.h"
|
|
#include "access/relation.h"
|
|
#include "access/table.h"
|
|
#include "catalog/catalog.h"
|
|
#include "catalog/indexing.h"
|
|
#include "catalog/pg_seclabel.h"
|
|
#include "catalog/pg_shseclabel.h"
|
|
#include "commands/seclabel.h"
|
|
#include "miscadmin.h"
|
|
#include "utils/builtins.h"
|
|
#include "utils/fmgroids.h"
|
|
#include "utils/memutils.h"
|
|
#include "utils/rel.h"
|
|
|
|
typedef struct
|
|
{
|
|
const char *provider_name;
|
|
check_object_relabel_type hook;
|
|
} LabelProvider;
|
|
|
|
static List *label_provider_list = NIL;
|
|
|
|
/*
|
|
* ExecSecLabelStmt --
|
|
*
|
|
* Apply a security label to a database object.
|
|
*
|
|
* Returns the ObjectAddress of the object to which the policy was applied.
|
|
*/
|
|
ObjectAddress
|
|
ExecSecLabelStmt(SecLabelStmt *stmt)
|
|
{
|
|
LabelProvider *provider = NULL;
|
|
ObjectAddress address;
|
|
Relation relation;
|
|
ListCell *lc;
|
|
|
|
/*
|
|
* Find the named label provider, or if none specified, check whether
|
|
* there's exactly one, and if so use it.
|
|
*/
|
|
if (stmt->provider == NULL)
|
|
{
|
|
if (label_provider_list == NIL)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("no security label providers have been loaded")));
|
|
if (list_length(label_provider_list) != 1)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("must specify provider when multiple security label providers have been loaded")));
|
|
provider = (LabelProvider *) linitial(label_provider_list);
|
|
}
|
|
else
|
|
{
|
|
foreach(lc, label_provider_list)
|
|
{
|
|
LabelProvider *lp = lfirst(lc);
|
|
|
|
if (strcmp(stmt->provider, lp->provider_name) == 0)
|
|
{
|
|
provider = lp;
|
|
break;
|
|
}
|
|
}
|
|
if (provider == NULL)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("security label provider \"%s\" is not loaded",
|
|
stmt->provider)));
|
|
}
|
|
|
|
/*
|
|
* Translate the parser representation which identifies this object into
|
|
* an ObjectAddress. get_object_address() will throw an error if the
|
|
* object does not exist, and will also acquire a lock on the target to
|
|
* guard against concurrent modifications.
|
|
*/
|
|
address = get_object_address(stmt->objtype, stmt->object,
|
|
&relation, ShareUpdateExclusiveLock, false);
|
|
|
|
/* Require ownership of the target object. */
|
|
check_object_ownership(GetUserId(), stmt->objtype, address,
|
|
stmt->object, relation);
|
|
|
|
/* Perform other integrity checks as needed. */
|
|
switch (stmt->objtype)
|
|
{
|
|
case OBJECT_COLUMN:
|
|
|
|
/*
|
|
* Allow security labels only on columns of tables, views,
|
|
* materialized views, composite types, and foreign tables (which
|
|
* are the only relkinds for which pg_dump will dump labels).
|
|
*/
|
|
if (relation->rd_rel->relkind != RELKIND_RELATION &&
|
|
relation->rd_rel->relkind != RELKIND_VIEW &&
|
|
relation->rd_rel->relkind != RELKIND_MATVIEW &&
|
|
relation->rd_rel->relkind != RELKIND_COMPOSITE_TYPE &&
|
|
relation->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
|
|
relation->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
|
|
errmsg("\"%s\" is not a table, view, materialized view, composite type, or foreign table",
|
|
RelationGetRelationName(relation))));
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Provider gets control here, may throw ERROR to veto new label. */
|
|
provider->hook(&address, stmt->label);
|
|
|
|
/* Apply new label. */
|
|
SetSecurityLabel(&address, provider->provider_name, stmt->label);
|
|
|
|
/*
|
|
* If get_object_address() opened the relation for us, we close it to keep
|
|
* the reference count correct - but we retain any locks acquired by
|
|
* get_object_address() until commit time, to guard against concurrent
|
|
* activity.
|
|
*/
|
|
if (relation != NULL)
|
|
relation_close(relation, NoLock);
|
|
|
|
return address;
|
|
}
|
|
|
|
/*
|
|
* GetSharedSecurityLabel returns the security label for a shared object for
|
|
* a given provider, or NULL if there is no such label.
|
|
*/
|
|
static char *
|
|
GetSharedSecurityLabel(const ObjectAddress *object, const char *provider)
|
|
{
|
|
Relation pg_shseclabel;
|
|
ScanKeyData keys[3];
|
|
SysScanDesc scan;
|
|
HeapTuple tuple;
|
|
Datum datum;
|
|
bool isnull;
|
|
char *seclabel = NULL;
|
|
|
|
ScanKeyInit(&keys[0],
|
|
Anum_pg_shseclabel_objoid,
|
|
BTEqualStrategyNumber, F_OIDEQ,
|
|
ObjectIdGetDatum(object->objectId));
|
|
ScanKeyInit(&keys[1],
|
|
Anum_pg_shseclabel_classoid,
|
|
BTEqualStrategyNumber, F_OIDEQ,
|
|
ObjectIdGetDatum(object->classId));
|
|
ScanKeyInit(&keys[2],
|
|
Anum_pg_shseclabel_provider,
|
|
BTEqualStrategyNumber, F_TEXTEQ,
|
|
CStringGetTextDatum(provider));
|
|
|
|
pg_shseclabel = table_open(SharedSecLabelRelationId, AccessShareLock);
|
|
|
|
scan = systable_beginscan(pg_shseclabel, SharedSecLabelObjectIndexId, true,
|
|
NULL, 3, keys);
|
|
|
|
tuple = systable_getnext(scan);
|
|
if (HeapTupleIsValid(tuple))
|
|
{
|
|
datum = heap_getattr(tuple, Anum_pg_shseclabel_label,
|
|
RelationGetDescr(pg_shseclabel), &isnull);
|
|
if (!isnull)
|
|
seclabel = TextDatumGetCString(datum);
|
|
}
|
|
systable_endscan(scan);
|
|
|
|
table_close(pg_shseclabel, AccessShareLock);
|
|
|
|
return seclabel;
|
|
}
|
|
|
|
/*
|
|
* GetSecurityLabel returns the security label for a shared or database object
|
|
* for a given provider, or NULL if there is no such label.
|
|
*/
|
|
char *
|
|
GetSecurityLabel(const ObjectAddress *object, const char *provider)
|
|
{
|
|
Relation pg_seclabel;
|
|
ScanKeyData keys[4];
|
|
SysScanDesc scan;
|
|
HeapTuple tuple;
|
|
Datum datum;
|
|
bool isnull;
|
|
char *seclabel = NULL;
|
|
|
|
/* Shared objects have their own security label catalog. */
|
|
if (IsSharedRelation(object->classId))
|
|
return GetSharedSecurityLabel(object, provider);
|
|
|
|
/* Must be an unshared object, so examine pg_seclabel. */
|
|
ScanKeyInit(&keys[0],
|
|
Anum_pg_seclabel_objoid,
|
|
BTEqualStrategyNumber, F_OIDEQ,
|
|
ObjectIdGetDatum(object->objectId));
|
|
ScanKeyInit(&keys[1],
|
|
Anum_pg_seclabel_classoid,
|
|
BTEqualStrategyNumber, F_OIDEQ,
|
|
ObjectIdGetDatum(object->classId));
|
|
ScanKeyInit(&keys[2],
|
|
Anum_pg_seclabel_objsubid,
|
|
BTEqualStrategyNumber, F_INT4EQ,
|
|
Int32GetDatum(object->objectSubId));
|
|
ScanKeyInit(&keys[3],
|
|
Anum_pg_seclabel_provider,
|
|
BTEqualStrategyNumber, F_TEXTEQ,
|
|
CStringGetTextDatum(provider));
|
|
|
|
pg_seclabel = table_open(SecLabelRelationId, AccessShareLock);
|
|
|
|
scan = systable_beginscan(pg_seclabel, SecLabelObjectIndexId, true,
|
|
NULL, 4, keys);
|
|
|
|
tuple = systable_getnext(scan);
|
|
if (HeapTupleIsValid(tuple))
|
|
{
|
|
datum = heap_getattr(tuple, Anum_pg_seclabel_label,
|
|
RelationGetDescr(pg_seclabel), &isnull);
|
|
if (!isnull)
|
|
seclabel = TextDatumGetCString(datum);
|
|
}
|
|
systable_endscan(scan);
|
|
|
|
table_close(pg_seclabel, AccessShareLock);
|
|
|
|
return seclabel;
|
|
}
|
|
|
|
/*
|
|
* SetSharedSecurityLabel is a helper function of SetSecurityLabel to
|
|
* handle shared database objects.
|
|
*/
|
|
static void
|
|
SetSharedSecurityLabel(const ObjectAddress *object,
|
|
const char *provider, const char *label)
|
|
{
|
|
Relation pg_shseclabel;
|
|
ScanKeyData keys[4];
|
|
SysScanDesc scan;
|
|
HeapTuple oldtup;
|
|
HeapTuple newtup = NULL;
|
|
Datum values[Natts_pg_shseclabel];
|
|
bool nulls[Natts_pg_shseclabel];
|
|
bool replaces[Natts_pg_shseclabel];
|
|
|
|
/* Prepare to form or update a tuple, if necessary. */
|
|
memset(nulls, false, sizeof(nulls));
|
|
memset(replaces, false, sizeof(replaces));
|
|
values[Anum_pg_shseclabel_objoid - 1] = ObjectIdGetDatum(object->objectId);
|
|
values[Anum_pg_shseclabel_classoid - 1] = ObjectIdGetDatum(object->classId);
|
|
values[Anum_pg_shseclabel_provider - 1] = CStringGetTextDatum(provider);
|
|
if (label != NULL)
|
|
values[Anum_pg_shseclabel_label - 1] = CStringGetTextDatum(label);
|
|
|
|
/* Use the index to search for a matching old tuple */
|
|
ScanKeyInit(&keys[0],
|
|
Anum_pg_shseclabel_objoid,
|
|
BTEqualStrategyNumber, F_OIDEQ,
|
|
ObjectIdGetDatum(object->objectId));
|
|
ScanKeyInit(&keys[1],
|
|
Anum_pg_shseclabel_classoid,
|
|
BTEqualStrategyNumber, F_OIDEQ,
|
|
ObjectIdGetDatum(object->classId));
|
|
ScanKeyInit(&keys[2],
|
|
Anum_pg_shseclabel_provider,
|
|
BTEqualStrategyNumber, F_TEXTEQ,
|
|
CStringGetTextDatum(provider));
|
|
|
|
pg_shseclabel = table_open(SharedSecLabelRelationId, RowExclusiveLock);
|
|
|
|
scan = systable_beginscan(pg_shseclabel, SharedSecLabelObjectIndexId, true,
|
|
NULL, 3, keys);
|
|
|
|
oldtup = systable_getnext(scan);
|
|
if (HeapTupleIsValid(oldtup))
|
|
{
|
|
if (label == NULL)
|
|
CatalogTupleDelete(pg_shseclabel, &oldtup->t_self);
|
|
else
|
|
{
|
|
replaces[Anum_pg_shseclabel_label - 1] = true;
|
|
newtup = heap_modify_tuple(oldtup, RelationGetDescr(pg_shseclabel),
|
|
values, nulls, replaces);
|
|
CatalogTupleUpdate(pg_shseclabel, &oldtup->t_self, newtup);
|
|
}
|
|
}
|
|
systable_endscan(scan);
|
|
|
|
/* If we didn't find an old tuple, insert a new one */
|
|
if (newtup == NULL && label != NULL)
|
|
{
|
|
newtup = heap_form_tuple(RelationGetDescr(pg_shseclabel),
|
|
values, nulls);
|
|
CatalogTupleInsert(pg_shseclabel, newtup);
|
|
}
|
|
|
|
if (newtup != NULL)
|
|
heap_freetuple(newtup);
|
|
|
|
table_close(pg_shseclabel, RowExclusiveLock);
|
|
}
|
|
|
|
/*
|
|
* SetSecurityLabel attempts to set the security label for the specified
|
|
* provider on the specified object to the given value. NULL means that any
|
|
* existing label should be deleted.
|
|
*/
|
|
void
|
|
SetSecurityLabel(const ObjectAddress *object,
|
|
const char *provider, const char *label)
|
|
{
|
|
Relation pg_seclabel;
|
|
ScanKeyData keys[4];
|
|
SysScanDesc scan;
|
|
HeapTuple oldtup;
|
|
HeapTuple newtup = NULL;
|
|
Datum values[Natts_pg_seclabel];
|
|
bool nulls[Natts_pg_seclabel];
|
|
bool replaces[Natts_pg_seclabel];
|
|
|
|
/* Shared objects have their own security label catalog. */
|
|
if (IsSharedRelation(object->classId))
|
|
{
|
|
SetSharedSecurityLabel(object, provider, label);
|
|
return;
|
|
}
|
|
|
|
/* Prepare to form or update a tuple, if necessary. */
|
|
memset(nulls, false, sizeof(nulls));
|
|
memset(replaces, false, sizeof(replaces));
|
|
values[Anum_pg_seclabel_objoid - 1] = ObjectIdGetDatum(object->objectId);
|
|
values[Anum_pg_seclabel_classoid - 1] = ObjectIdGetDatum(object->classId);
|
|
values[Anum_pg_seclabel_objsubid - 1] = Int32GetDatum(object->objectSubId);
|
|
values[Anum_pg_seclabel_provider - 1] = CStringGetTextDatum(provider);
|
|
if (label != NULL)
|
|
values[Anum_pg_seclabel_label - 1] = CStringGetTextDatum(label);
|
|
|
|
/* Use the index to search for a matching old tuple */
|
|
ScanKeyInit(&keys[0],
|
|
Anum_pg_seclabel_objoid,
|
|
BTEqualStrategyNumber, F_OIDEQ,
|
|
ObjectIdGetDatum(object->objectId));
|
|
ScanKeyInit(&keys[1],
|
|
Anum_pg_seclabel_classoid,
|
|
BTEqualStrategyNumber, F_OIDEQ,
|
|
ObjectIdGetDatum(object->classId));
|
|
ScanKeyInit(&keys[2],
|
|
Anum_pg_seclabel_objsubid,
|
|
BTEqualStrategyNumber, F_INT4EQ,
|
|
Int32GetDatum(object->objectSubId));
|
|
ScanKeyInit(&keys[3],
|
|
Anum_pg_seclabel_provider,
|
|
BTEqualStrategyNumber, F_TEXTEQ,
|
|
CStringGetTextDatum(provider));
|
|
|
|
pg_seclabel = table_open(SecLabelRelationId, RowExclusiveLock);
|
|
|
|
scan = systable_beginscan(pg_seclabel, SecLabelObjectIndexId, true,
|
|
NULL, 4, keys);
|
|
|
|
oldtup = systable_getnext(scan);
|
|
if (HeapTupleIsValid(oldtup))
|
|
{
|
|
if (label == NULL)
|
|
CatalogTupleDelete(pg_seclabel, &oldtup->t_self);
|
|
else
|
|
{
|
|
replaces[Anum_pg_seclabel_label - 1] = true;
|
|
newtup = heap_modify_tuple(oldtup, RelationGetDescr(pg_seclabel),
|
|
values, nulls, replaces);
|
|
CatalogTupleUpdate(pg_seclabel, &oldtup->t_self, newtup);
|
|
}
|
|
}
|
|
systable_endscan(scan);
|
|
|
|
/* If we didn't find an old tuple, insert a new one */
|
|
if (newtup == NULL && label != NULL)
|
|
{
|
|
newtup = heap_form_tuple(RelationGetDescr(pg_seclabel),
|
|
values, nulls);
|
|
CatalogTupleInsert(pg_seclabel, newtup);
|
|
}
|
|
|
|
/* Update indexes, if necessary */
|
|
if (newtup != NULL)
|
|
heap_freetuple(newtup);
|
|
|
|
table_close(pg_seclabel, RowExclusiveLock);
|
|
}
|
|
|
|
/*
|
|
* DeleteSharedSecurityLabel is a helper function of DeleteSecurityLabel
|
|
* to handle shared database objects.
|
|
*/
|
|
void
|
|
DeleteSharedSecurityLabel(Oid objectId, Oid classId)
|
|
{
|
|
Relation pg_shseclabel;
|
|
ScanKeyData skey[2];
|
|
SysScanDesc scan;
|
|
HeapTuple oldtup;
|
|
|
|
ScanKeyInit(&skey[0],
|
|
Anum_pg_shseclabel_objoid,
|
|
BTEqualStrategyNumber, F_OIDEQ,
|
|
ObjectIdGetDatum(objectId));
|
|
ScanKeyInit(&skey[1],
|
|
Anum_pg_shseclabel_classoid,
|
|
BTEqualStrategyNumber, F_OIDEQ,
|
|
ObjectIdGetDatum(classId));
|
|
|
|
pg_shseclabel = table_open(SharedSecLabelRelationId, RowExclusiveLock);
|
|
|
|
scan = systable_beginscan(pg_shseclabel, SharedSecLabelObjectIndexId, true,
|
|
NULL, 2, skey);
|
|
while (HeapTupleIsValid(oldtup = systable_getnext(scan)))
|
|
CatalogTupleDelete(pg_shseclabel, &oldtup->t_self);
|
|
systable_endscan(scan);
|
|
|
|
table_close(pg_shseclabel, RowExclusiveLock);
|
|
}
|
|
|
|
/*
|
|
* DeleteSecurityLabel removes all security labels for an object (and any
|
|
* sub-objects, if applicable).
|
|
*/
|
|
void
|
|
DeleteSecurityLabel(const ObjectAddress *object)
|
|
{
|
|
Relation pg_seclabel;
|
|
ScanKeyData skey[3];
|
|
SysScanDesc scan;
|
|
HeapTuple oldtup;
|
|
int nkeys;
|
|
|
|
/* Shared objects have their own security label catalog. */
|
|
if (IsSharedRelation(object->classId))
|
|
{
|
|
Assert(object->objectSubId == 0);
|
|
DeleteSharedSecurityLabel(object->objectId, object->classId);
|
|
return;
|
|
}
|
|
|
|
ScanKeyInit(&skey[0],
|
|
Anum_pg_seclabel_objoid,
|
|
BTEqualStrategyNumber, F_OIDEQ,
|
|
ObjectIdGetDatum(object->objectId));
|
|
ScanKeyInit(&skey[1],
|
|
Anum_pg_seclabel_classoid,
|
|
BTEqualStrategyNumber, F_OIDEQ,
|
|
ObjectIdGetDatum(object->classId));
|
|
if (object->objectSubId != 0)
|
|
{
|
|
ScanKeyInit(&skey[2],
|
|
Anum_pg_seclabel_objsubid,
|
|
BTEqualStrategyNumber, F_INT4EQ,
|
|
Int32GetDatum(object->objectSubId));
|
|
nkeys = 3;
|
|
}
|
|
else
|
|
nkeys = 2;
|
|
|
|
pg_seclabel = table_open(SecLabelRelationId, RowExclusiveLock);
|
|
|
|
scan = systable_beginscan(pg_seclabel, SecLabelObjectIndexId, true,
|
|
NULL, nkeys, skey);
|
|
while (HeapTupleIsValid(oldtup = systable_getnext(scan)))
|
|
CatalogTupleDelete(pg_seclabel, &oldtup->t_self);
|
|
systable_endscan(scan);
|
|
|
|
table_close(pg_seclabel, RowExclusiveLock);
|
|
}
|
|
|
|
void
|
|
register_label_provider(const char *provider_name, check_object_relabel_type hook)
|
|
{
|
|
LabelProvider *provider;
|
|
MemoryContext oldcxt;
|
|
|
|
oldcxt = MemoryContextSwitchTo(TopMemoryContext);
|
|
provider = palloc(sizeof(LabelProvider));
|
|
provider->provider_name = pstrdup(provider_name);
|
|
provider->hook = hook;
|
|
label_provider_list = lappend(label_provider_list, provider);
|
|
MemoryContextSwitchTo(oldcxt);
|
|
}
|