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Update sepgsql to add mandatory access control for TRUNCATE

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Use SELinux "db_table: { truncate }" to check if permission is granted to
TRUNCATE. Update example SELinux policy to grant needed permission for
TRUNCATE. Add new regression test to demonstrate a positive and negative
cases. Test will only be run if the loaded SELinux policy has the
"db_table: { truncate }" permission. Makes use of recent commit which added
object TRUNCATE hook. Patch by Yuli Khodorkovskiy with minor
editorialization by me. Not back-patched because the object TRUNCATE hook
was not.

Author: Yuli Khodorkovskiy
Reviewed-by: Joe Conway
Discussion: https://postgr.es/m/CAFL5wJcomybj1Xdw7qWmPJRpGuFukKgNrDb6uVBaCMgYS9dkaA%40mail.gmail.com
This commit is contained in:
Joe Conway
2019-11-23 10:41:52 -05:00
parent f7a2002e82
commit 4f66c93f61
8 changed files with 152 additions and 1 deletions
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24
contrib/sepgsql/sql/truncate.sql Normal file
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--
-- Regression Test for TRUNCATE
--
--
-- Setup
--
CREATE TABLE julio_claudians (name text, birth_date date);
SECURITY LABEL ON TABLE julio_claudians IS 'system_u:object_r:sepgsql_regtest_foo_table_t:s0';
INSERT INTO julio_claudians VALUES ('Augustus', 'September 23, 63 BC'), ('Tiberius', 'November 16, 42 BC'), ('Caligula', 'August 31, 0012'), ('Claudius', 'August 1, 0010'), ('Nero', 'December 15, 0037');
CREATE TABLE flavians (name text, birth_date date);
SECURITY LABEL ON TABLE flavians IS 'system_u:object_r:sepgsql_table_t:s0';
INSERT INTO flavians VALUES ('Vespasian', 'November 17, 0009'), ('Titus', 'December 30, 0039'), ('Domitian', 'October 24, 0051');
SELECT * from julio_claudians;
SELECT * from flavians;
TRUNCATE TABLE julio_claudians; -- ok
TRUNCATE TABLE flavians; -- failed
SELECT * from julio_claudians;
SELECT * from flavians;