Luigi Semenzato | 7c6a69f | 2010-09-30 13:35:11 -0700 | [diff] [blame] | 1 | #!/bin/bash -e |
| 2 | # |
| 3 | # Copyright (c) 2010 The Chromium OS Authors. All rights reserved. |
| 4 | # Use of this source code is governed by a BSD-style license that can be |
| 5 | # found in the LICENSE file. |
| 6 | |
| 7 | # Attempt to trigger the TPM Dictionary Attack Defense Lock and measure its |
| 8 | # behavior. |
| 9 | |
| 10 | owned=$(cat /sys/class/misc/tpm0/device/owned) |
| 11 | if [ "$owned" = "" ]; then |
| 12 | echo "TPM is not functional" |
| 13 | exit 1 |
| 14 | fi |
| 15 | if [ "$owned" = "0" ]; then |
| 16 | echo "please use random, non-empty passwords" |
| 17 | tpm_takeownership || exit 1 |
| 18 | fi |
| 19 | |
| 20 | attempts=0 |
| 21 | max=1 |
| 22 | e=/tmp/x$$ |
| 23 | |
| 24 | while true; do |
| 25 | attempts=$(( $attempts + 1 )) |
| 26 | before=$(date +%s) |
| 27 | defending=1 |
| 28 | while [ $defending -eq 1 ]; do |
| 29 | if tpm_getpubek -z 2> $e; then |
| 30 | echo "unexpected success of tpm_getpubek" |
| 31 | exit 1 |
| 32 | fi |
| 33 | if grep -q communication $e; then |
| 34 | echo "communication failure" |
| 35 | exit 1 |
| 36 | fi |
| 37 | if ! grep -q dictionary $e; then |
| 38 | defending=0 |
| 39 | fi |
| 40 | done |
| 41 | after=$(date +%s) |
| 42 | elapsed=$(( $after - $before )) |
| 43 | if [ $elapsed -gt $max ]; then |
| 44 | echo delay of $elapsed seconds after $attempts attempts |
| 45 | max=$elapsed |
| 46 | fi |
| 47 | done |