#!/bin/bash

# For the license, see the LICENSE file in the root directory.
#set -x

ROOT=${abs_top_builddir:-$(pwd)/..}
TESTDIR=${abs_top_testdir:-$(dirname "$0")}

VTPM_NAME="${VTPM_NAME:-vtpm-tpm2-test-save-load-state-locking}"
SWTPM_DEV_NAME="/dev/${VTPM_NAME}"
TPM_PATH="$(mktemp -d)" || exit 1
STATE_FILE="$TPM_PATH/tpm2-00.permall"
VOLATILE_STATE_FILE="$TPM_PATH/tpm2-00.volatilestate"
MY_VOLATILE_STATE_FILE="$TPM_PATH/my.volatilestate"
MY_PERMANENT_STATE_FILE="$TPM_PATH/my.permanent"
MY_SAVESTATE_STATE_FILE="$TPM_PATH/my.savestate"
SWTPM_INTERFACE="${SWTPM_INTERFACE:-cuse}"
SWTPM_CMD_UNIX_PATH="${TPM_PATH}/unix-cmd.sock"
SWTPM_CTRL_UNIX_PATH="${TPM_PATH}/unix-ctrl.sock"

function cleanup()
{
	if [ -n "${SWTPM_PID}" ]; then
		kill_quiet -9 "${SWTPM_PID}"
	fi
	rm -rf "$TPM_PATH"
}

trap "cleanup" EXIT

[ "${SWTPM_INTERFACE}" == "cuse" ] && source "${TESTDIR}/test_cuse"
source "${TESTDIR}/common"

TPM_PATH=$TPM_PATH run_swtpm "${SWTPM_INTERFACE}" \
	--migration release-lock-outgoing \
	--tpm2

if ! kill_quiet -0 "${SWTPM_PID}"; then
	echo "Error: ${SWTPM_INTERFACE} TPM did not start."
	exit 1
fi
check_swtpm_no_storage_lock "${SWTPM_PID}"

# Init the TPM
if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" -i; then
	echo "Error: Could not initialize the ${SWTPM_INTERFACE} TPM."
	exit 1
fi
check_swtpm_storage_locked "${SWTPM_PID}"
swtpm_lock_storage "re-lock"

if ! kill_quiet -0 "${SWTPM_PID}" 2>/dev/null; then
	echo "Error: ${SWTPM_INTERFACE} TPM not running anymore after INIT."
	exit 1
fi

# Startup the TPM
RES=$(swtpm_cmd_tx "${SWTPM_INTERFACE}" '\x80\x01\x00\x00\x00\x0c\x00\x00\x01\x44\x00\x00')
exp=' 80 01 00 00 00 0a 00 00 00 00'
if [ "$RES" != "$exp" ]; then
	echo "Error: Did not get expected result from TPM2_Startup(ST_Clear)"
	echo "expected: $exp"
	echo "received: $RES"
	exit 1
fi
check_swtpm_storage_locked "${SWTPM_PID}"
swtpm_lock_storage "re-lock"

if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" -h 1234; then
	echo "Error: Hash command did not work."
	exit 1
fi

# Read PCR 17
#                                                  length         CC            count       hashalg         sz
RES=$(swtpm_cmd_tx "${SWTPM_INTERFACE}" '\x80\x01\x00\x00\x00\x14\x00\x00\x01\x7e\x00\x00\x00\x01\x00\x0b\x03\x00\x00\x02')
exp=' 80 01 00 00 00 3e 00 00 00 00 00 00 00 18 00 00 00 01 00 0b 03 00 00 02 00 00 00 01 00 20 fc a5 d6 49 bf b0 c9 22 fd 33 0f 79 b2 00 43 28 9d af d6 0d 01 a4 c4 37 3c f2 8a db 56 c9 b4 54'
if [ "$RES" != "$exp" ]; then
	echo "Error: (1) Did not get expected result from TPM_PCRRead(17)"
	echo "expected: $exp"
	echo "received: $RES"
	exit 1
fi

if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" --save permanent "$MY_PERMANENT_STATE_FILE"; then
	echo "Error: Could not write permanent state file $MY_PERMANENT_STATE_FILE."
	exit 1
fi
if [ ! -r "$MY_PERMANENT_STATE_FILE" ]; then
	echo "Error: Permanent state file $MY_PERMANENT_STATE_FILE does not exist."
	exit 1
fi
echo "Saved permanent state."
check_swtpm_storage_locked "${SWTPM_PID}"
swtpm_lock_storage "re-lock"

if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" --save volatile "$MY_VOLATILE_STATE_FILE"; then
	echo "Error: Could not write volatile state file $MY_VOLATILE_STATE_FILE."
	exit 1
fi
if [ ! -r "$MY_VOLATILE_STATE_FILE" ]; then
	echo "Error: Volatile state file $MY_VOLATILE_STATE_FILE does not exist."
	exit 1
fi
echo "Saved volatile state."
check_swtpm_storage_locked "${SWTPM_PID}"
swtpm_lock_storage "re-lock"

if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" --save savestate "$MY_SAVESTATE_STATE_FILE"; then
	echo "Error: Could not write savestate state file $MY_SAVESTATE_STATE_FILE."
	exit 1
fi
if [ ! -r "$MY_SAVESTATE_STATE_FILE" ]; then
	echo "Error: Volatile state file $MY_SAVESTATE_STATE_FILE does not exist."
	exit 1
fi
echo "Saved savestate state."
check_swtpm_no_storage_lock "${SWTPM_PID}"

swtpm_lock_storage "lock"
swtpm_lock_storage "re-lock"

check_swtpm_storage_locked "${SWTPM_PID}"
swtpm_lock_storage "re-lock"

# Upon the next command swtpm must again lock storage; this simulates TPM usage after migration fall-back
RES=$(swtpm_cmd_tx "${SWTPM_INTERFACE}" '\x80\x01\x00\x00\x00\x0a\x00\x00\x01\x7a')
exp=' 80 01 00 00 00 0a 00 00 01 da'
if [ "$RES" != "$exp" ]; then
	echo "Error: (1) Did not get expected result from TPM_PCRRead(17)"
	echo "expected: $exp"
	echo "received: $RES"
	exit 1
fi
check_swtpm_storage_locked "${SWTPM_PID}"
swtpm_lock_storage "re-lock"

if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" -s; then
	echo "Error: Could not shut down the ${SWTPM_INTERFACE} TPM."
	exit 1
fi

if wait_process_gone "${SWTPM_PID}" 4; then
	echo "Error: ${SWTPM_INTERFACE} TPM should not be running anymore."
	exit 1
fi

# Restart swtpm
rm -f "$VOLATILE_STATE_FILE" "$STATE_FILE"
TPM_PATH=$TPM_PATH run_swtpm "${SWTPM_INTERFACE}" \
	--migration incoming,release-lock-outgoing \
	--tpm2

if ! kill_quiet -0 "${SWTPM_PID}"; then
	echo "Error: ${SWTPM_INTERFACE} TPM did not start."
	exit 1
fi
check_swtpm_no_storage_lock "${SWTPM_PID}"

# load state into the TPM
if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" --load permanent "$MY_PERMANENT_STATE_FILE"; then
	echo "Could not load permanent state into vTPM"
	exit 1
fi
echo "Loaded permanent state."
check_swtpm_storage_locked "${SWTPM_PID}"
swtpm_lock_storage "re-lock"

if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" --load volatile "$MY_VOLATILE_STATE_FILE"; then
	echo "Could not load volatile state into vTPM"
	exit 1
fi
echo "Loaded volatile state."
check_swtpm_storage_locked "${SWTPM_PID}"

# Init the TPM
if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" -i; then
	echo "TPM Init failed."
	exit 1
fi
check_swtpm_storage_locked "${SWTPM_PID}"
swtpm_lock_storage "re-lock"

# Volatile state must have been removed by TPM now
if [ -r "$VOLATILE_STATE_FILE" ]; then
	echo "Error: Volatile state file $VOLATILE_STATE_FILE still exists."
	exit 1
fi

# Read the PCR again ...
RES=$(swtpm_cmd_tx "${SWTPM_INTERFACE}" '\x80\x01\x00\x00\x00\x14\x00\x00\x01\x7e\x00\x00\x00\x01\x00\x0b\x03\x00\x00\x02')
exp=' 80 01 00 00 00 3e 00 00 00 00 00 00 00 18 00 00 00 01 00 0b 03 00 00 02 00 00 00 01 00 20 fc a5 d6 49 bf b0 c9 22 fd 33 0f 79 b2 00 43 28 9d af d6 0d 01 a4 c4 37 3c f2 8a db 56 c9 b4 54'
if [ "$RES" != "$exp" ]; then
	echo "Error: (2) Did not get expected result from TPM_PCRRead(17)"
	echo "expected: $exp"
	echo "received: $RES"
	exit 1
fi

# Save the volatile state again
if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" -v; then
	echo "Error: Could not have the ${SWTPM_INTERFACE} TPM store the volatile state to a file."
	exit 1
fi

if [ ! -r "$VOLATILE_STATE_FILE" ]; then
	echo "Error: Volatile state file $VOLATILE_STATE_FILE does not exist."
	exit 1
fi

# Send a new TPM_Init
if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" -i; then
	echo "Error: Could not initialize the ${SWTPM_INTERFACE} TPM."
	exit 1
fi

# Volatile state must have been removed by TPM now
if [ -r "$VOLATILE_STATE_FILE" ]; then
	echo "Error: Volatile state file $VOLATILE_STATE_FILE still exists."
	exit 1
fi

# Read the PCR again ...
RES=$(swtpm_cmd_tx "${SWTPM_INTERFACE}" '\x80\x01\x00\x00\x00\x14\x00\x00\x01\x7e\x00\x00\x00\x01\x00\x0b\x03\x00\x00\x02')
exp=' 80 01 00 00 00 3e 00 00 00 00 00 00 00 18 00 00 00 01 00 0b 03 00 00 02 00 00 00 01 00 20 fc a5 d6 49 bf b0 c9 22 fd 33 0f 79 b2 00 43 28 9d af d6 0d 01 a4 c4 37 3c f2 8a db 56 c9 b4 54'
if [ "$RES" != "$exp" ]; then
	echo "Error: (3) Did not get expected result from TPM_PCRRead(17)"
	echo "expected: $exp"
	echo "received: $RES"
	exit 1
fi

# Final shut down
if ! run_swtpm_ioctl "${SWTPM_INTERFACE}" -s; then
	echo "Error: Could not shut down the ${SWTPM_INTERFACE} TPM."
	exit 1
fi

if wait_process_gone "${SWTPM_PID}" 4; then
	echo "Error: ${SWTPM_INTERFACE} TPM should not be running anymore."
	exit 1
fi

if [ ! -e "$STATE_FILE" ]; then
	echo "Error: TPM state file $STATE_FILE does not exist."
	exit 1
fi

echo "OK"

exit 0