# $OpenBSD: integrity.sh,v 1.10 2013/05/17 01:32:11 dtucker Exp $ # Placed in the Public Domain. tid="integrity" # start at byte 2900 (i.e. after kex) and corrupt at different offsets # XXX the test hangs if we modify the low bytes of the packet length # XXX and ssh tries to read... tries=10 startoffset=2900 macs="hmac-sha1 hmac-md5 umac-64@openssh.com umac-128@openssh.com hmac-sha1-96 hmac-md5-96 hmac-sha1-etm@openssh.com hmac-md5-etm@openssh.com umac-64-etm@openssh.com umac-128-etm@openssh.com hmac-sha1-96-etm@openssh.com hmac-md5-96-etm@openssh.com" config_defined HAVE_EVP_SHA256 && macs="$macs hmac-sha2-256 hmac-sha2-512 hmac-sha2-256-etm@openssh.com hmac-sha2-512-etm@openssh.com" # The following are not MACs, but ciphers with integrated integrity. They are # handled specially below. config_defined OPENSSL_HAVE_EVPGCM && \ macs="$macs aes128-gcm@openssh.com aes256-gcm@openssh.com" # avoid DH group exchange as the extra traffic makes it harder to get the # offset into the stream right. echo "KexAlgorithms diffie-hellman-group14-sha1,diffie-hellman-group1-sha1" \ >> $OBJ/ssh_proxy # sshd-command for proxy (see test-exec.sh) cmd="$SUDO sh ${SRC}/sshd-log-wrapper.sh ${SSHD} ${TEST_SSHD_LOGFILE} -i -f $OBJ/sshd_proxy" for m in $macs; do trace "test $tid: mac $m" elen=0 epad=0 emac=0 ecnt=0 skip=0 for off in `jot $tries $startoffset`; do skip=`expr $skip - 1` if [ $skip -gt 0 ]; then # avoid modifying the high bytes of the length continue fi # modify output from sshd at offset $off pxy="proxycommand=$cmd | $OBJ/modpipe -wm xor:$off:1" case $m in aes*gcm*) macopt="-c $m";; *) macopt="-m $m";; esac verbose "test $tid: $m @$off" ${SSH} $macopt -2F $OBJ/ssh_proxy -o "$pxy" \ 999.999.999.999 'printf "%4096s" " "' >/dev/null if [ $? -eq 0 ]; then fail "ssh -m $m succeeds with bit-flip at $off" fi ecnt=`expr $ecnt + 1` output=$(tail -2 $TEST_SSH_LOGFILE | egrep -v "^debug" | \ tr -s '\r\n' '.') case "$output" in Bad?packet*) elen=`expr $elen + 1`; skip=3;; Corrupted?MAC* | Decryption?integrity?check?failed*) emac=`expr $emac + 1`; skip=0;; padding*) epad=`expr $epad + 1`; skip=0;; *) fail "unexpected error mac $m at $off";; esac done verbose "test $tid: $ecnt errors: mac $emac padding $epad length $elen" if [ $emac -eq 0 ]; then fail "$m: no mac errors" fi expect=`expr $ecnt - $epad - $elen` if [ $emac -ne $expect ]; then fail "$m: expected $expect mac errors, got $emac" fi done