mirror of git://anongit.mindrot.org/openssh.git
77 lines
2.5 KiB
Bash
77 lines
2.5 KiB
Bash
# $OpenBSD: integrity.sh,v 1.10 2013/05/17 01:32:11 dtucker Exp $
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# Placed in the Public Domain.
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tid="integrity"
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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="hmac-sha1 hmac-md5 umac-64@openssh.com umac-128@openssh.com
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hmac-sha1-96 hmac-md5-96
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hmac-sha1-etm@openssh.com hmac-md5-etm@openssh.com
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umac-64-etm@openssh.com umac-128-etm@openssh.com
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hmac-sha1-96-etm@openssh.com hmac-md5-96-etm@openssh.com"
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config_defined HAVE_EVP_SHA256 &&
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macs="$macs hmac-sha2-256 hmac-sha2-512
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hmac-sha2-256-etm@openssh.com hmac-sha2-512-etm@openssh.com"
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# The following are not MACs, but ciphers with integrated integrity. They are
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# handled specially below.
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config_defined OPENSSL_HAVE_EVPGCM && \
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macs="$macs aes128-gcm@openssh.com aes256-gcm@openssh.com"
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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 ${SSHD} ${TEST_SSHD_LOGFILE} -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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# modify output from sshd at offset $off
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pxy="proxycommand=$cmd | $OBJ/modpipe -wm xor:$off:1"
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case $m in
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aes*gcm*) macopt="-c $m";;
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*) macopt="-m $m";;
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esac
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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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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 $ecnt + 1`
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output=$(tail -2 $TEST_SSH_LOGFILE | egrep -v "^debug" | \
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tr -s '\r\n' '.')
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case "$output" in
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Bad?packet*) elen=`expr $elen + 1`; skip=3;;
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Corrupted?MAC* | Decryption?integrity?check?failed*)
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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";;
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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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