1# $OpenBSD: integrity.sh,v 1.7 2013/02/20 08:27:50 djm Exp $ 2# Placed in the Public Domain. 3 4tid="integrity" 5 6# start at byte 2900 (i.e. after kex) and corrupt at different offsets 7# XXX the test hangs if we modify the low bytes of the packet length 8# XXX and ssh tries to read... 9tries=10 10startoffset=2900 11macs="hmac-sha1 hmac-md5 umac-64@openssh.com umac-128@openssh.com 12 hmac-sha1-96 hmac-md5-96 13 hmac-sha1-etm@openssh.com hmac-md5-etm@openssh.com 14 umac-64-etm@openssh.com umac-128-etm@openssh.com 15 hmac-sha1-96-etm@openssh.com hmac-md5-96-etm@openssh.com" 16config_defined HAVE_EVP_SHA256 && 17 macs="$macs hmac-sha2-256 hmac-sha2-512 18 hmac-sha2-256-etm@openssh.com hmac-sha2-512-etm@openssh.com" 19# The following are not MACs, but ciphers with integrated integrity. They are 20# handled specially below. 21config_defined OPENSSL_HAVE_EVPGCM && \ 22 macs="$macs aes128-gcm@openssh.com aes256-gcm@openssh.com" 23 24# sshd-command for proxy (see test-exec.sh) 25cmd="$SUDO sh ${SRC}/sshd-log-wrapper.sh ${SSHD} ${TEST_SSH_LOGFILE} -i -f $OBJ/sshd_proxy" 26 27jot() { 28 awk "BEGIN { for (i = $2; i < $2 + $1; i++) { printf \"%d\n\", i } exit }" 29} 30 31for m in $macs; do 32 trace "test $tid: mac $m" 33 elen=0 34 epad=0 35 emac=0 36 ecnt=0 37 skip=0 38 for off in `jot $tries $startoffset`; do 39 skip=`expr $skip - 1` 40 if [ $skip -gt 0 ]; then 41 # avoid modifying the high bytes of the length 42 continue 43 fi 44 # modify output from sshd at offset $off 45 pxy="proxycommand=$cmd | $OBJ/modpipe -wm xor:$off:1" 46 case $m in 47 aes*gcm*) macopt="-c $m";; 48 *) macopt="-m $m";; 49 esac 50 output=`${SSH} $macopt -2F $OBJ/ssh_proxy -o "$pxy" \ 51 999.999.999.999 'printf "%4096s" " "' 2>&1` 52 if [ $? -eq 0 ]; then 53 fail "ssh -m $m succeeds with bit-flip at $off" 54 fi 55 ecnt=`expr $ecnt + 1` 56 output=`echo $output | tr -s '\r\n' '.'` 57 verbose "test $tid: $m @$off $output" 58 case "$output" in 59 Bad?packet*) elen=`expr $elen + 1`; skip=3;; 60 Corrupted?MAC* | Decryption?integrity?check?failed*) 61 emac=`expr $emac + 1`; skip=0;; 62 padding*) epad=`expr $epad + 1`; skip=0;; 63 *) fail "unexpected error mac $m at $off";; 64 esac 65 done 66 verbose "test $tid: $ecnt errors: mac $emac padding $epad length $elen" 67 if [ $emac -eq 0 ]; then 68 fail "$m: no mac errors" 69 fi 70 expect=`expr $ecnt - $epad - $elen` 71 if [ $emac -ne $expect ]; then 72 fail "$m: expected $expect mac errors, got $emac" 73 fi 74done 75