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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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16
contrib/sepgsql/test_sepgsql
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@ -287,6 +287,20 @@ echo "found ${NUM}"
echo
echo "============== running sepgsql regression tests =============="
make REGRESS="label dml ddl alter misc" REGRESS_OPTS="--launcher ./launcher" installcheck
tests="label dml ddl alter misc"
# Check if the truncate permission exists in the loaded policy, and if so,
# run the truncate test
#
# Testing the TRUNCATE regression test can be done by manually adding
# the permission with CIL if necessary:
# sudo semodule -cE base
# sudo sed -i -E 's/(class db_table.*?) \)/\1 truncate\)/' base.cil
# sudo semodule -i base.cil
if [ -f /sys/fs/selinux/class/db_table/perms/truncate ]; then
tests+=" truncate"
fi
make REGRESS="$tests" REGRESS_OPTS="--launcher ./launcher" installcheck
# exit with the exit code provided by "make"