[LTP] [PATCH v3 1/2] IMA: Add a test to verify measurment of keys

[Mimi Zohar <zohar@kernel.org>]

[Resending due to mailer issues]

On Wed, 2020-06-24 at 09:21 -0400, Mimi Zohar wrote:
> Hi Lachian,
> 
> > +
> > +# Based on https://lkml.org/lkml/2019/12/13/564.
> > +# (450d0fd51564 - "IMA: Call workqueue functions to measure queued keys")
> > +test1()
> > +{
> > +	local keyrings keycheck_line templates test_file=$(mktemp)
> > +
> > +	tst_res TINFO "verifying key measurement for keyrings and templates specified in IMA policy file"
> > +
> > +	[ -f $IMA_POLICY ] || tst_brk TCONF "missing $IMA_POLICY"
> > +
> > +	[ -r $IMA_POLICY ] || tst_brk TCONF "cannot read IMA policy (CONFIG_IMA_READ_POLICY=y required)"
> > +
> > +	keycheck_line=$(grep "func=KEY_CHECK" $IMA_POLICY)
> > +	if [ -z "$keycheck_line" ]; then
> > +		tst_brk TCONF "ima policy does not specify \"func=KEY_CHECK\""
> > +	fi
> > +
> > +	if echo "$keycheck_line" | grep -q "*keyrings*"; then
> > +		tst_brk TCONF "ima policy does not specify a keyrings to check"
> > +	fi
> > +
> > +	keyrings=$(echo "$keycheck_line" | tr " " "\n" | grep "keyrings" | \
> > +		sed "s/\./\\\./g" | cut -d'=' -f2)
> > +	if [ -z "$keyrings" ]; then
> > +		tst_brk TCONF "ima policy has a keyring key-value specifier, but no specified keyrings"
> > +	fi
> > +
> > +	templates=$(echo "$keycheck_line" | tr " " "\n" | grep "template" | \
> > +		cut -d'=' -f2)
> > +
> > +	grep -E "($templates)*($keyrings)" $ASCII_MEASUREMENTS | while read line
> 
> Probably because I have multiple KEY_CHECK rules, this is failing:
> 
> grep: Unmatched ( or \(
> 
> And then it continues merrily alongs its way.
> 
> ima_keys 1 TPASS: specified keyrings were measured correctly
> ima_keys 2 TCONF: missing /etc/keys/x509_ima.der
> 
> Mimi
> 
> > +	do
> > +		local digest expected_digest algorithm
> > +
> > +		digest=$(echo "$line" | cut -d' ' -f4 | cut -d':' -f2)
> > +		algorithm=$(echo "$line" | cut -d' ' -f4 | cut -d':' -f1)
> > +		keyring=$(echo "$line" | cut -d' ' -f5)
> > +
> > +		echo "$line" | cut -d' ' -f6 | xxd -r -p > $test_file
> > +
> > +		expected_digest="$(compute_digest $algorithm $test_file)" || \
> > +			tst_brk TCONF "cannot compute digest for $algorithm"
> > +
> > +		if [ "$digest" != "$expected_digest" ]; then
> > +			tst_res TFAIL "incorrect digest was found for the ($keyring) keyring"
> > +		fi
> > +	done
> > +
> > +	rm $test_file
> > +
> > +	tst_res TPASS "specified keyrings were measured correctly"
> > +}