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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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8
contrib/sepgsql/sepgsql-regtest.te
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@ -150,6 +150,14 @@ allow sepgsql_regtest_var_t sepgsql_regtest_var_table_t:db_table { getattr selec
allow sepgsql_regtest_var_t sepgsql_regtest_var_table_t:db_column { getattr select update insert };
allow sepgsql_regtest_var_t sepgsql_regtest_var_table_t:db_tuple { select update insert delete };
optional_policy(`
gen_require(`
class db_table { truncate };
')
allow sepgsql_regtest_superuser_t sepgsql_regtest_foo_table_t:db_table { truncate };
')
optional_policy(`
gen_require(`
role unconfined_r;