1# $OpenBSD: integrity.sh,v 1.24 2020/01/21 08:06:27 djm Exp $ 2# Placed in the Public Domain. 3 4tid="integrity" 5cp $OBJ/sshd_proxy $OBJ/sshd_proxy_bak 6 7# start at byte 2900 (i.e. after kex) and corrupt at different offsets 8tries=10 9startoffset=2900 10macs=`${SSH} -Q mac` 11# The following are not MACs, but ciphers with integrated integrity. They are 12# handled specially below. 13macs="$macs `${SSH} -Q cipher-auth`" 14 15# sshd-command for proxy (see test-exec.sh) 16cmd="$SUDO env SSH_SK_HELPER="$SSH_SK_HELPER" sh ${SRC}/sshd-log-wrapper.sh ${TEST_SSHD_LOGFILE} ${SSHD} -i -f $OBJ/sshd_proxy" 17 18for m in $macs; do 19 trace "test $tid: mac $m" 20 elen=0 21 epad=0 22 emac=0 23 etmo=0 24 ecnt=0 25 skip=0 26 for off in `jot $tries $startoffset`; do 27 skip=`expr $skip - 1` 28 if [ $skip -gt 0 ]; then 29 # avoid modifying the high bytes of the length 30 continue 31 fi 32 cp $OBJ/sshd_proxy_bak $OBJ/sshd_proxy 33 # modify output from sshd at offset $off 34 pxy="proxycommand=$cmd | $OBJ/modpipe -wm xor:$off:1" 35 if ${SSH} -Q cipher-auth | grep "^${m}\$" >/dev/null 2>&1 ; then 36 echo "Ciphers=$m" >> $OBJ/sshd_proxy 37 macopt="-c $m" 38 else 39 echo "Ciphers=aes128-ctr" >> $OBJ/sshd_proxy 40 echo "MACs=$m" >> $OBJ/sshd_proxy 41 macopt="-m $m -c aes128-ctr" 42 fi 43 verbose "test $tid: $m @$off" 44 ${SSH} $macopt -F $OBJ/ssh_proxy -o "$pxy" \ 45 -oServerAliveInterval=1 -oServerAliveCountMax=30 \ 46 999.999.999.999 'printf "%4096s" " "' >/dev/null 47 if [ $? -eq 0 ]; then 48 fail "ssh -m $m succeeds with bit-flip at $off" 49 fi 50 ecnt=`expr $ecnt + 1` 51 out=$(egrep -v "^debug" $TEST_SSH_LOGFILE | tail -2 | \ 52 tr -s '\r\n' '.') 53 case "$out" in 54 Bad?packet*) elen=`expr $elen + 1`; skip=3;; 55 Corrupted?MAC* | *message?authentication?code?incorrect*) 56 emac=`expr $emac + 1`; skip=0;; 57 padding*) epad=`expr $epad + 1`; skip=0;; 58 *Timeout,?server*) 59 etmo=`expr $etmo + 1`; skip=0;; 60 *) fail "unexpected error mac $m at $off: $out";; 61 esac 62 done 63 verbose "test $tid: $ecnt errors: mac $emac padding $epad length $elen timeout $etmo" 64 if [ $emac -eq 0 ]; then 65 fail "$m: no mac errors" 66 fi 67 expect=`expr $ecnt - $epad - $elen - $etmo` 68 if [ $emac -ne $expect ]; then 69 fail "$m: expected $expect mac errors, got $emac" 70 fi 71done 72