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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
View File

@ -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

80
contrib/sepgsql/expected/create.out Normal file
View File

@ -0,0 +1,80 @@
--
-- Regression Test for Creation of Object Permission Checks
--
-- confirm required permissions using audit messages
SELECT sepgsql_getcon(); -- confirm client privilege
sepgsql_getcon
-------------------------------------------
unconfined_u:unconfined_r:unconfined_t:s0
(1 row)
SET sepgsql.debug_audit = true;
SET client_min_messages = LOG;
CREATE DATABASE regtest_sepgsql_test_database;
LOG: SELinux: allowed { getattr } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=system_u:object_r:sepgsql_db_t:s0 tclass=db_database name="database template1"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_db_t:s0 tclass=db_database name="database regtest_sepgsql_test_database"
CREATE SCHEMA regtest_schema;
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_schema_t:s0 tclass=db_schema name="schema regtest_schema"
SET search_path = regtest_schema, public;
CREATE TABLE regtest_table (x serial primary key, y text);
NOTICE: CREATE TABLE will create implicit sequence "regtest_table_x_seq" for serial column "regtest_table.x"
LOG: SELinux: allowed { add_name } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_schema_t:s0 tclass=db_schema name="schema regtest_schema"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_seq_t:s0 tclass=db_sequence name="sequence regtest_table_x_seq"
LOG: SELinux: allowed { add_name } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_schema_t:s0 tclass=db_schema name="schema regtest_schema"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_table name="table regtest_table"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table column tableoid"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table column cmax"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table column xmax"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table column cmin"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table column xmin"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table column ctid"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table column x"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table column y"
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "regtest_table_pkey" for table "regtest_table"
ALTER TABLE regtest_table ADD COLUMN z int;
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table column z"
CREATE TABLE regtest_table_2 (a int) WITH OIDS;
LOG: SELinux: allowed { add_name } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_schema_t:s0 tclass=db_schema name="schema regtest_schema"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_table name="table regtest_table_2"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table_2 column tableoid"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table_2 column cmax"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table_2 column xmax"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table_2 column cmin"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table_2 column xmin"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table_2 column oid"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table_2 column ctid"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table_2 column a"
-- corresponding toast table should not have label and permission checks
ALTER TABLE regtest_table_2 ADD COLUMN b text;
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_table_t:s0 tclass=db_column name="table regtest_table_2 column b"
-- VACUUM FULL internally create a new table and swap them later.
VACUUM FULL regtest_table;
CREATE VIEW regtest_view AS SELECT * FROM regtest_table WHERE x < 100;
LOG: SELinux: allowed { add_name } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_schema_t:s0 tclass=db_schema name="schema regtest_schema"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_view_t:s0 tclass=db_view name="view regtest_view"
CREATE SEQUENCE regtest_seq;
LOG: SELinux: allowed { add_name } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_schema_t:s0 tclass=db_schema name="schema regtest_schema"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_seq_t:s0 tclass=db_sequence name="sequence regtest_seq"
CREATE TYPE regtest_comptype AS (a int, b text);
CREATE FUNCTION regtest_func(text,int[]) RETURNS bool LANGUAGE plpgsql
AS 'BEGIN RAISE NOTICE ''regtest_func => %'', $1; RETURN true; END';
LOG: SELinux: allowed { add_name } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_schema_t:s0 tclass=db_schema name="schema regtest_schema"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_proc_exec_t:s0 tclass=db_procedure name="function regtest_func(text,integer[])"
CREATE AGGREGATE regtest_agg (
sfunc1 = int4pl, basetype = int4, stype1 = int4, initcond1 = '0'
);
LOG: SELinux: allowed { add_name } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_schema_t:s0 tclass=db_schema name="schema regtest_schema"
LOG: SELinux: allowed { create } scontext=unconfined_u:unconfined_r:unconfined_t:s0 tcontext=unconfined_u:object_r:sepgsql_proc_exec_t:s0 tclass=db_procedure name="function regtest_agg(integer)"
--
-- clean-up
--
DROP DATABASE IF EXISTS regtest_sepgsql_test_database;
DROP SCHEMA IF EXISTS regtest_schema CASCADE;
NOTICE: drop cascades to 7 other objects
DETAIL: drop cascades to table regtest_table
drop cascades to table regtest_table_2
drop cascades to view regtest_view
drop cascades to sequence regtest_seq
drop cascades to type regtest_comptype
drop cascades to function regtest_func(text,integer[])
drop cascades to function regtest_agg(integer)

188
contrib/sepgsql/hooks.c
View File

@ -41,6 +41,23 @@ static ExecutorCheckPerms_hook_type next_exec_check_perms_hook = NULL;
static needs_fmgr_hook_type next_needs_fmgr_hook = NULL;
static fmgr_hook_type next_fmgr_hook = NULL;
static ProcessUtility_hook_type next_ProcessUtility_hook = NULL;
static ExecutorStart_hook_type next_ExecutorStart_hook = NULL;
/*
* Contextual information on DDL commands
*/
typedef struct
{
NodeTag cmdtype;
/*
* Name of the template database given by users on CREATE DATABASE
* command. Elsewhere (including the case of default) NULL.
*/
const char *createdb_dtemplate;
} sepgsql_context_info_t;
static sepgsql_context_info_t sepgsql_context_info;
/*
* GUC: sepgsql.permissive = (on|off)
@ -127,7 +144,8 @@ sepgsql_object_access(ObjectAccessType access,
switch (classId)
{
case DatabaseRelationId:
sepgsql_database_post_create(objectId);
sepgsql_database_post_create(objectId,
sepgsql_context_info.createdb_dtemplate);
break;
case NamespaceRelationId:
@ -136,7 +154,30 @@ sepgsql_object_access(ObjectAccessType access,
case RelationRelationId:
if (subId == 0)
sepgsql_relation_post_create(objectId);
{
/*
* All cases we want to apply permission checks on
* creation of a new relation are invocation of the
* heap_create_with_catalog via DefineRelation or
* OpenIntoRel.
* Elsewhere, we need neither assignment of security
* label nor permission checks.
*/
switch (sepgsql_context_info.cmdtype)
{
case T_CreateStmt:
case T_ViewStmt:
case T_CreateSeqStmt:
case T_CompositeTypeStmt:
case T_CreateForeignTableStmt:
case T_SelectStmt:
sepgsql_relation_post_create(objectId);
break;
default:
/* via make_new_heap() */
break;
}
}
else
sepgsql_attribute_post_create(objectId, subId);
break;
@ -294,6 +335,46 @@ sepgsql_fmgr_hook(FmgrHookEventType event,
}
}
/*
* sepgsql_executor_start
*
* It saves contextual information during ExecutorStart to distinguish
* a case with/without permission checks later.
*/
static void
sepgsql_executor_start(QueryDesc *queryDesc, int eflags)
{
sepgsql_context_info_t saved_context_info = sepgsql_context_info;
PG_TRY();
{
if (queryDesc->operation == CMD_SELECT)
sepgsql_context_info.cmdtype = T_SelectStmt;
else if (queryDesc->operation == CMD_INSERT)
sepgsql_context_info.cmdtype = T_InsertStmt;
else if (queryDesc->operation == CMD_DELETE)
sepgsql_context_info.cmdtype = T_DeleteStmt;
else if (queryDesc->operation == CMD_UPDATE)
sepgsql_context_info.cmdtype = T_UpdateStmt;
/*
* XXX - If queryDesc->operation is not above four cases, an error
* shall be raised on the following executor stage soon.
*/
if (next_ExecutorStart_hook)
(*next_ExecutorStart_hook) (queryDesc, eflags);
else
standard_ExecutorStart(queryDesc, eflags);
}
PG_CATCH();
{
sepgsql_context_info = saved_context_info;
PG_RE_THROW();
}
PG_END_TRY();
sepgsql_context_info = saved_context_info;
}
/*
* sepgsql_utility_command
*
@ -308,44 +389,74 @@ sepgsql_utility_command(Node *parsetree,
DestReceiver *dest,
char *completionTag)
{
if (next_ProcessUtility_hook)
(*next_ProcessUtility_hook) (parsetree, queryString, params,
isTopLevel, dest, completionTag);
sepgsql_context_info_t saved_context_info = sepgsql_context_info;
ListCell *cell;
/*
* Check command tag to avoid nefarious operations
*/
switch (nodeTag(parsetree))
PG_TRY();
{
case T_LoadStmt:
/*
* Check command tag to avoid nefarious operations, and save the
* current contextual information to determine whether we should
* apply permission checks here, or not.
*/
sepgsql_context_info.cmdtype = nodeTag(parsetree);
/*
* We reject LOAD command across the board on enforcing mode,
* because a binary module can arbitrarily override hooks.
*/
if (sepgsql_getenforce())
{
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("SELinux: LOAD is not permitted")));
}
break;
default:
switch (nodeTag(parsetree))
{
case T_CreatedbStmt:
/*
* We hope to reference name of the source database, but it
* does not appear in system catalog. So, we save it here.
*/
foreach (cell, ((CreatedbStmt *) parsetree)->options)
{
DefElem *defel = (DefElem *) lfirst(cell);
/*
* Right now we don't check any other utility commands, because it
* needs more detailed information to make access control decision
* here, but we don't want to have two parse and analyze routines
* individually.
*/
break;
if (strcmp(defel->defname, "template") == 0)
{
sepgsql_context_info.createdb_dtemplate
= strVal(defel->arg);
break;
}
}
break;
case T_LoadStmt:
/*
* We reject LOAD command across the board on enforcing mode,
* because a binary module can arbitrarily override hooks.
*/
if (sepgsql_getenforce())
{
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("SELinux: LOAD is not permitted")));
}
break;
default:
/*
* Right now we don't check any other utility commands,
* because it needs more detailed information to make access
* control decision here, but we don't want to have two parse
* and analyze routines individually.
*/
break;
}
if (next_ProcessUtility_hook)
(*next_ProcessUtility_hook) (parsetree, queryString, params,
isTopLevel, dest, completionTag);
else
standard_ProcessUtility(parsetree, queryString, params,
isTopLevel, dest, completionTag);
}
/*
* Original implementation
*/
standard_ProcessUtility(parsetree, queryString, params,
isTopLevel, dest, completionTag);
PG_CATCH();
{
sepgsql_context_info = saved_context_info;
PG_RE_THROW();
}
PG_END_TRY();
sepgsql_context_info = saved_context_info;
}
/*
@ -456,4 +567,11 @@ _PG_init(void)
/* ProcessUtility hook */
next_ProcessUtility_hook = ProcessUtility_hook;
ProcessUtility_hook = sepgsql_utility_command;
/* ExecutorStart hook */
next_ExecutorStart_hook = ExecutorStart_hook;
ExecutorStart_hook = sepgsql_executor_start;
/* init contextual info */
memset(&sepgsql_context_info, 0, sizeof(sepgsql_context_info));
}

55
contrib/sepgsql/proc.c
View File

@ -18,6 +18,7 @@
#include "catalog/pg_namespace.h"
#include "catalog/pg_proc.h"
#include "commands/seclabel.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/lsyscache.h"
#include "utils/tqual.h"
@ -37,11 +38,13 @@ sepgsql_proc_post_create(Oid functionId)
ScanKeyData skey;
SysScanDesc sscan;
HeapTuple tuple;
Oid namespaceId;
ObjectAddress object;
char *scontext;
char *tcontext;
char *ncontext;
int i;
StringInfoData audit_name;
ObjectAddress object;
Form_pg_proc proForm;
/*
* Fetch namespace of the new procedure. Because pg_proc entry is not
@ -61,20 +64,53 @@ sepgsql_proc_post_create(Oid functionId)
if (!HeapTupleIsValid(tuple))
elog(ERROR, "catalog lookup failed for proc %u", functionId);
namespaceId = ((Form_pg_proc) GETSTRUCT(tuple))->pronamespace;
proForm = (Form_pg_proc) GETSTRUCT(tuple);
/*
* check db_schema:{add_name} permission of the namespace
*/
object.classId = NamespaceRelationId;
object.objectId = proForm->pronamespace;
object.objectSubId = 0;
sepgsql_avc_check_perms(&object,
SEPG_CLASS_DB_SCHEMA,
SEPG_DB_SCHEMA__ADD_NAME,
getObjectDescription(&object),
true);
/*
* XXX - db_language:{implement} also should be checked here
*/
systable_endscan(sscan);
heap_close(rel, AccessShareLock);
/*
* 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(NamespaceRelationId, namespaceId, 0);
tcontext = sepgsql_get_label(NamespaceRelationId,
proForm->pronamespace, 0);
ncontext = sepgsql_compute_create(scontext, tcontext,
SEPG_CLASS_DB_PROCEDURE);
/*
* check db_procedure:{create} permission
*/
initStringInfo(&audit_name);
appendStringInfo(&audit_name, "function %s(", NameStr(proForm->proname));
for (i=0; i < proForm->pronargs; i++)
{
Oid typeoid = proForm->proargtypes.values[i];
if (i > 0)
appendStringInfoChar(&audit_name, ',');
appendStringInfoString(&audit_name, format_type_be(typeoid));
}
appendStringInfoChar(&audit_name, ')');
sepgsql_avc_check_perms_label(ncontext,
SEPG_CLASS_DB_PROCEDURE,
SEPG_DB_PROCEDURE__CREATE,
audit_name.data,
true);
/*
* Assign the default security label on a new procedure
*/
@ -83,6 +119,13 @@ sepgsql_proc_post_create(Oid functionId)
object.objectSubId = 0;
SetSecurityLabel(&object, SEPGSQL_LABEL_TAG, ncontext);
/*
* Cleanup
*/
systable_endscan(sscan);
heap_close(rel, AccessShareLock);
pfree(audit_name.data);
pfree(tcontext);
pfree(ncontext);
}

144
contrib/sepgsql/relation.c
View File

@ -36,10 +36,16 @@
void
sepgsql_attribute_post_create(Oid relOid, AttrNumber attnum)
{
char *scontext = sepgsql_get_client_label();
Relation rel;
ScanKeyData skey[2];
SysScanDesc sscan;
HeapTuple tuple;
char *scontext;
char *tcontext;
char *ncontext;
char audit_name[2*NAMEDATALEN + 20];
ObjectAddress object;
Form_pg_attribute attForm;
/*
* Only attributes within regular relation have individual security
@ -49,13 +55,44 @@ sepgsql_attribute_post_create(Oid relOid, AttrNumber attnum)
return;
/*
* Compute a default security label when we create a new procedure object
* under the specified namespace.
* Compute a default security label of the new column underlying the
* specified relation, and check permission to create it.
*/
rel = heap_open(AttributeRelationId, AccessShareLock);
ScanKeyInit(&skey[0],
Anum_pg_attribute_attrelid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(relOid));
ScanKeyInit(&skey[1],
Anum_pg_attribute_attnum,
BTEqualStrategyNumber, F_INT2EQ,
Int16GetDatum(attnum));
sscan = systable_beginscan(rel, AttributeRelidNumIndexId, true,
SnapshotSelf, 2, &skey[0]);
tuple = systable_getnext(sscan);
if (!HeapTupleIsValid(tuple))
elog(ERROR, "catalog lookup failed for column %d of relation %u",
attnum, relOid);
attForm = (Form_pg_attribute) GETSTRUCT(tuple);
scontext = sepgsql_get_client_label();
tcontext = sepgsql_get_label(RelationRelationId, relOid, 0);
ncontext = sepgsql_compute_create(scontext, tcontext,
SEPG_CLASS_DB_COLUMN);
/*
* check db_column:{create} permission
*/
snprintf(audit_name, sizeof(audit_name), "table %s column %s",
get_rel_name(relOid), NameStr(attForm->attname));
sepgsql_avc_check_perms_label(ncontext,
SEPG_CLASS_DB_COLUMN,
SEPG_DB_COLUMN__CREATE,
audit_name,
true);
/*
* Assign the default security label on a new procedure
@ -65,6 +102,9 @@ sepgsql_attribute_post_create(Oid relOid, AttrNumber attnum)
object.objectSubId = attnum;
SetSecurityLabel(&object, SEPGSQL_LABEL_TAG, ncontext);
systable_endscan(sscan);
heap_close(rel, AccessShareLock);
pfree(tcontext);
pfree(ncontext);
}
@ -127,10 +167,12 @@ sepgsql_relation_post_create(Oid relOid)
Form_pg_class classForm;
ObjectAddress object;
uint16 tclass;
const char *tclass_text;
char *scontext; /* subject */
char *tcontext; /* schema */
char *rcontext; /* relation */
char *ccontext; /* column */
char audit_name[2*NAMEDATALEN + 20];
/*
* Fetch catalog record of the new relation. Because pg_class entry is not
@ -152,15 +194,35 @@ sepgsql_relation_post_create(Oid 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 */
switch (classForm->relkind)
{
case RELKIND_RELATION:
tclass = SEPG_CLASS_DB_TABLE;
tclass_text = "table";
break;
case RELKIND_SEQUENCE:
tclass = SEPG_CLASS_DB_SEQUENCE;
tclass_text = "sequence";
break;
case RELKIND_VIEW:
tclass = SEPG_CLASS_DB_VIEW;
tclass_text = "view";
break;
default:
goto out;
}
/*
* check db_schema:{add_name} permission of the namespace
*/
object.classId = NamespaceRelationId;
object.objectId = classForm->relnamespace;
object.objectSubId = 0;
sepgsql_avc_check_perms(&object,
SEPG_CLASS_DB_SCHEMA,
SEPG_DB_SCHEMA__ADD_NAME,
getObjectDescription(&object),
true);
/*
* Compute a default security label when we create a new relation object
* under the specified namespace.
@ -170,6 +232,16 @@ sepgsql_relation_post_create(Oid relOid)
classForm->relnamespace, 0);
rcontext = sepgsql_compute_create(scontext, tcontext, tclass);
/*
* check db_xxx:{create} permission
*/
snprintf(audit_name, sizeof(audit_name), "%s %s",
tclass_text, NameStr(classForm->relname));
sepgsql_avc_check_perms_label(rcontext,
tclass,
SEPG_DB_DATABASE__CREATE,
audit_name,
true);
/*
* Assign the default security label on the new relation
*/
@ -184,26 +256,52 @@ sepgsql_relation_post_create(Oid relOid)
*/
if (classForm->relkind == RELKIND_RELATION)
{
AttrNumber index;
Relation arel;
ScanKeyData akey;
SysScanDesc ascan;
HeapTuple atup;
Form_pg_attribute attForm;
ccontext = sepgsql_compute_create(scontext, rcontext,
SEPG_CLASS_DB_COLUMN);
for (index = FirstLowInvalidHeapAttributeNumber + 1;
index <= classForm->relnatts;
index++)
arel = heap_open(AttributeRelationId, AccessShareLock);
ScanKeyInit(&akey,
Anum_pg_attribute_attrelid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(relOid));
ascan = systable_beginscan(arel, AttributeRelidNumIndexId, true,
SnapshotSelf, 1, &akey);
while (HeapTupleIsValid(atup = systable_getnext(ascan)))
{
if (index == InvalidAttrNumber)
continue;
attForm = (Form_pg_attribute) GETSTRUCT(atup);
if (index == ObjectIdAttributeNumber && !classForm->relhasoids)
continue;
snprintf(audit_name, sizeof(audit_name), "%s %s column %s",
tclass_text,
NameStr(classForm->relname),
NameStr(attForm->attname));
ccontext = sepgsql_compute_create(scontext,
rcontext,
SEPG_CLASS_DB_COLUMN);
/*
* check db_column:{create} permission
*/
sepgsql_avc_check_perms_label(ccontext,
SEPG_CLASS_DB_COLUMN,
SEPG_DB_COLUMN__CREATE,
audit_name,
true);
object.classId = RelationRelationId;
object.objectId = relOid;
object.objectSubId = index;
object.objectSubId = attForm->attnum;
SetSecurityLabel(&object, SEPGSQL_LABEL_TAG, ccontext);
pfree(ccontext);
}
pfree(ccontext);
systable_endscan(ascan);
heap_close(arel, AccessShareLock);
}
pfree(rcontext);
out:

50
contrib/sepgsql/schema.c
View File

@ -10,12 +10,18 @@
*/
#include "postgres.h"
#include "access/genam.h"
#include "access/heapam.h"
#include "access/sysattr.h"
#include "catalog/dependency.h"
#include "catalog/indexing.h"
#include "catalog/pg_database.h"
#include "catalog/pg_namespace.h"
#include "commands/seclabel.h"
#include "miscadmin.h"
#include "utils/fmgroids.h"
#include "utils/lsyscache.h"
#include "utils/tqual.h"
#include "sepgsql.h"
@ -28,19 +34,55 @@
void
sepgsql_schema_post_create(Oid namespaceId)
{
char *scontext;
Relation rel;
ScanKeyData skey;
SysScanDesc sscan;
HeapTuple tuple;
char *tcontext;
char *ncontext;
ObjectAddress object;
char audit_name[NAMEDATALEN + 20];
ObjectAddress object;
Form_pg_namespace nspForm;
/*
* Compute a default security label when we create a new schema object
* under the working database.
*
* XXX - uncoming version of libselinux supports to take object
* name to handle special treatment on default security label;
* such as special label on "pg_temp" schema.
*/
scontext = sepgsql_get_client_label();
rel = heap_open(NamespaceRelationId, AccessShareLock);
ScanKeyInit(&skey,
ObjectIdAttributeNumber,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(namespaceId));
sscan = systable_beginscan(rel, NamespaceOidIndexId, true,
SnapshotSelf, 1, &skey);
tuple = systable_getnext(sscan);
if (!HeapTupleIsValid(tuple))
elog(ERROR, "catalog lookup failed for namespace %u", namespaceId);
nspForm = (Form_pg_namespace) GETSTRUCT(tuple);
tcontext = sepgsql_get_label(DatabaseRelationId, MyDatabaseId, 0);
ncontext = sepgsql_compute_create(scontext, tcontext,
ncontext = sepgsql_compute_create(sepgsql_get_client_label(),
tcontext,
SEPG_CLASS_DB_SCHEMA);
/*
* check db_schema:{create}
*/
snprintf(audit_name, sizeof(audit_name),
"schema %s", NameStr(nspForm->nspname));
sepgsql_avc_check_perms_label(ncontext,
SEPG_CLASS_DB_SCHEMA,
SEPG_DB_SCHEMA__CREATE,
audit_name,
true);
systable_endscan(sscan);
heap_close(rel, AccessShareLock);
/*
* Assign the default security label on a new procedure

3
contrib/sepgsql/sepgsql.h
View File

@ -286,7 +286,8 @@ extern bool sepgsql_dml_privileges(List *rangeTabls, bool abort);
/*
* database.c
*/
extern void sepgsql_database_post_create(Oid databaseId);
extern void sepgsql_database_post_create(Oid databaseId,
const char *dtemplate);
extern void sepgsql_database_relabel(Oid databaseId, const char *seclabel);
/*

46
contrib/sepgsql/sql/create.sql Normal file
View File

@ -0,0 +1,46 @@
--
-- Regression Test for Creation of Object Permission Checks
--
-- confirm required permissions using audit messages
-- @SECURITY-CONTEXT=unconfined_u:unconfined_r:unconfined_t:s0
SET sepgsql.debug_audit = true;
SET client_min_messages = LOG;
CREATE DATABASE regtest_sepgsql_test_database;
CREATE SCHEMA regtest_schema;
SET search_path = regtest_schema, public;
CREATE TABLE regtest_table (x serial primary key, y text);
ALTER TABLE regtest_table ADD COLUMN z int;
CREATE TABLE regtest_table_2 (a int) WITH OIDS;
-- corresponding toast table should not have label and permission checks
ALTER TABLE regtest_table_2 ADD COLUMN b text;
-- VACUUM FULL internally create a new table and swap them later.
VACUUM FULL regtest_table;
CREATE VIEW regtest_view AS SELECT * FROM regtest_table WHERE x < 100;
CREATE SEQUENCE regtest_seq;
CREATE TYPE regtest_comptype AS (a int, b text);
CREATE FUNCTION regtest_func(text,int[]) RETURNS bool LANGUAGE plpgsql
AS 'BEGIN RAISE NOTICE ''regtest_func => %'', $1; RETURN true; END';
CREATE AGGREGATE regtest_agg (
sfunc1 = int4pl, basetype = int4, stype1 = int4, initcond1 = '0'
);
--
-- clean-up
--
DROP DATABASE IF EXISTS regtest_sepgsql_test_database;
DROP SCHEMA IF EXISTS regtest_schema CASCADE;

2
contrib/sepgsql/test_sepgsql
View File

@ -259,6 +259,6 @@ echo "found ${NUM}"
echo
echo "============== running sepgsql regression tests =============="
make REGRESS="label dml misc" REGRESS_OPTS="--launcher ./launcher" installcheck
make REGRESS="label dml create misc" REGRESS_OPTS="--launcher ./launcher" installcheck
# exit with the exit code provided by "make"

30
doc/src/sgml/sepgsql.sgml
View File

@ -420,6 +420,33 @@ UPDATE t1 SET x = 2, y = md5sum(y) WHERE z = 100;
<sect3>
<title>DDL Permissions</title>
<para>
<productname>SELinux</> defines several permissions to control common
operations for each object types; such as creation, alter, drop and
relabel of security label. In addition, several object types has its
special permissions to control its characteristic operations; such as
addition or deletion of name entries underlying a particular schema.
</para>
<para>
When <literal>CREATE</> command is executed, <literal>create</> will
be checked on the object being constructed for each object types.
A default security label shall be assigned on the new database object,
and the <literal>create</> permission needs to be allowed on the pair
of security label of the client and the new object itself.
We consider <xref linkend="sql-createtable"> construct a table and
underlying columns at the same time, so it requires users permission
to create both of table and columns.
</para>
<para>
A few additional checks are applied depending on object types.
On <xref linkend="sql-createdatabase">, <literal>getattr</> permission
shall be checked on the source or template database of the new database,
not only <literal>create</> on the new database.
On creation of objects underlying a particula schema (tables, views,
sequences and procedures), <literal>add_name</> shall be also chechked
on the schema, not only <literal>create</> on the new object itself.
</para>
<para>
When <xref linkend="sql-security-label"> is executed, <literal>setattr</>
and <literal>relabelfrom</> will be checked on the object being relabeled
@ -509,7 +536,8 @@ postgres=# SELECT cid, cname, show_credit(cid) FROM customer;
<term>Data Definition Language (DDL) Permissions</term>
<listitem>
<para>
Due to implementation restrictions, DDL permissions are not checked.
Due to implementation restrictions, some of DDL permissions are not
checked.
</para>
</listitem>
</varlistentry>