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# $OpenBSD: integrity.sh,v 1.2 2013/01/12 11:23:53 djm Exp $
# Placed in the Public Domain.
tid="integrity"
# start at byte 2300 (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=2300
macs="hmac-sha1 hmac-md5 umac-64@openssh.com umac-128@openssh.com
hmac-sha1-96 hmac-md5-96 hmac-sha2-256 hmac-sha2-512
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
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"
# sshd-command for proxy (see test-exec.sh)
cmd="sh ${SRC}/sshd-log-wrapper.sh ${SSHD} ${TEST_SSH_LOGFILE} -i -f $OBJ/sshd_proxy"
jot() {
awk "BEGIN { for (i = $2; i < $2 + $1; i++) { printf \"%d\n\", i } }"
}
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 $startoffset); do
skip=$((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 | $OBJ/modpipe -m xor:$off:1"
case $m in
aes*gcm*) macopt="-c $m";;
*) macopt="-m $m";;
esac
output=$(${SSH} $macopt -2F $OBJ/ssh_proxy -o "$pxy" \
999.999.999.999 true 2>&1)
if [ $? -eq 0 ]; then
fail "ssh -m $m succeeds with bit-flip at $off"
fi
ecnt=$((ecnt+1))
output=$(echo $output | tr -s '\r\n' '.')
verbose "test $tid: $m @$off $output"
case "$output" in
Bad?packet*) elen=$((elen+1)); skip=3;;
Corrupted?MAC* | Decryption?integrity?check?failed*)
emac=$((emac+1)); skip=0;;
padding*) epad=$((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=$((ecnt-epad-elen))
if [ $emac -ne $expect ]; then
fail "$m: expected $expect mac errors, got $emac"
fi
done
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