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76 lines
2.3 KiB
Bash
76 lines
2.3 KiB
Bash
# $OpenBSD: integrity.sh,v 1.16 2015/03/24 20:22:17 markus Exp $
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# Placed in the Public Domain.
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tid="integrity"
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cp $OBJ/sshd_proxy $OBJ/sshd_proxy_bak
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# start at byte 2900 (i.e. after kex) and corrupt at different offsets
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# XXX the test hangs if we modify the low bytes of the packet length
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# XXX and ssh tries to read...
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tries=10
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startoffset=2900
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macs=`${SSH} -Q mac`
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# The following are not MACs, but ciphers with integrated integrity. They are
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# handled specially below.
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macs="$macs `${SSH} -Q cipher-auth`"
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# avoid DH group exchange as the extra traffic makes it harder to get the
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# offset into the stream right.
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echo "KexAlgorithms diffie-hellman-group14-sha1,diffie-hellman-group1-sha1" \
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>> $OBJ/ssh_proxy
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# sshd-command for proxy (see test-exec.sh)
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cmd="$SUDO sh ${SRC}/sshd-log-wrapper.sh ${TEST_SSHD_LOGFILE} ${SSHD} -i -f $OBJ/sshd_proxy"
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for m in $macs; do
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trace "test $tid: mac $m"
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elen=0
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epad=0
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emac=0
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ecnt=0
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skip=0
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for off in `jot $tries $startoffset`; do
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skip=`expr $skip - 1`
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if [ $skip -gt 0 ]; then
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# avoid modifying the high bytes of the length
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continue
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fi
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cp $OBJ/sshd_proxy_bak $OBJ/sshd_proxy
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# modify output from sshd at offset $off
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pxy="proxycommand=$cmd | $OBJ/modpipe -wm xor:$off:1"
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if ${SSH} -Q cipher-auth | grep "^${m}\$" >/dev/null 2>&1 ; then
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echo "Ciphers=$m" >> $OBJ/sshd_proxy
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macopt="-c $m"
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else
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echo "Ciphers=aes128-ctr" >> $OBJ/sshd_proxy
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echo "MACs=$m" >> $OBJ/sshd_proxy
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macopt="-m $m -c aes128-ctr"
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fi
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verbose "test $tid: $m @$off"
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${SSH} $macopt -2F $OBJ/ssh_proxy -o "$pxy" \
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-oServerAliveInterval=1 -oServerAliveCountMax=30 \
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999.999.999.999 'printf "%4096s" " "' >/dev/null
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if [ $? -eq 0 ]; then
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fail "ssh -m $m succeeds with bit-flip at $off"
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fi
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ecnt=`expr $ecnt + 1`
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out=$(tail -2 $TEST_SSH_LOGFILE | egrep -v "^debug" | \
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tr -s '\r\n' '.')
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case "$out" in
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Bad?packet*) elen=`expr $elen + 1`; skip=3;;
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Corrupted?MAC* | *message?authentication?code?incorrect*)
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emac=`expr $emac + 1`; skip=0;;
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padding*) epad=`expr $epad + 1`; skip=0;;
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*) fail "unexpected error mac $m at $off: $out";;
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esac
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done
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verbose "test $tid: $ecnt errors: mac $emac padding $epad length $elen"
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if [ $emac -eq 0 ]; then
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fail "$m: no mac errors"
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fi
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expect=`expr $ecnt - $epad - $elen`
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if [ $emac -ne $expect ]; then
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fail "$m: expected $expect mac errors, got $emac"
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fi
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done
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