1# $OpenBSD: integrity.sh,v 1.12 2013/11/21 03:18:51 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=`${SSH} -Q mac` 12# The following are not MACs, but ciphers with integrated integrity. They are 13# handled specially below. 14macs="$macs `${SSH} -Q cipher-auth`" 15 16# avoid DH group exchange as the extra traffic makes it harder to get the 17# offset into the stream right. 18echo "KexAlgorithms diffie-hellman-group14-sha1,diffie-hellman-group1-sha1" \ 19 >> $OBJ/ssh_proxy 20 21# sshd-command for proxy (see test-exec.sh) 22cmd="$SUDO sh ${SRC}/sshd-log-wrapper.sh ${SSHD} ${TEST_SSHD_LOGFILE} -i -f $OBJ/sshd_proxy" 23 24for m in $macs; do 25 trace "test $tid: mac $m" 26 elen=0 27 epad=0 28 emac=0 29 ecnt=0 30 skip=0 31 for off in `jot $tries $startoffset`; do 32 skip=`expr $skip - 1` 33 if [ $skip -gt 0 ]; then 34 # avoid modifying the high bytes of the length 35 continue 36 fi 37 # modify output from sshd at offset $off 38 pxy="proxycommand=$cmd | $OBJ/modpipe -wm xor:$off:1" 39 if ssh -Q cipher-auth | grep "^${m}\$" >/dev/null 2>&1 ; then 40 macopt="-c $m" 41 else 42 macopt="-m $m -c aes128-ctr" 43 fi 44 verbose "test $tid: $m @$off" 45 ${SSH} $macopt -2F $OBJ/ssh_proxy -o "$pxy" \ 46 -oServerAliveInterval=1 -oServerAliveCountMax=30 \ 47 999.999.999.999 'printf "%4096s" " "' >/dev/null 48 if [ $? -eq 0 ]; then 49 fail "ssh -m $m succeeds with bit-flip at $off" 50 fi 51 ecnt=`expr $ecnt + 1` 52 output=$(tail -2 $TEST_SSH_LOGFILE | egrep -v "^debug" | \ 53 tr -s '\r\n' '.') 54 case "$output" in 55 Bad?packet*) elen=`expr $elen + 1`; skip=3;; 56 Corrupted?MAC* | Decryption?integrity?check?failed*) 57 emac=`expr $emac + 1`; skip=0;; 58 padding*) epad=`expr $epad + 1`; skip=0;; 59 *) fail "unexpected error mac $m at $off";; 60 esac 61 done 62 verbose "test $tid: $ecnt errors: mac $emac padding $epad length $elen" 63 if [ $emac -eq 0 ]; then 64 fail "$m: no mac errors" 65 fi 66 expect=`expr $ecnt - $epad - $elen` 67 if [ $emac -ne $expect ]; then 68 fail "$m: expected $expect mac errors, got $emac" 69 fi 70done 71