59 lines
1.8 KiB
Bash
59 lines
1.8 KiB
Bash
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# $OpenBSD: integrity.sh,v 1.1 2012/12/11 22:42:11 markus Exp $
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# Placed in the Public Domain.
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tid="integrity"
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# start at byte 2300 (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=2300
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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 hmac-sha2-256 hmac-sha2-512
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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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hmac-sha2-256-etm@openssh.com hmac-sha2-512-etm@openssh.com"
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# sshd-command for proxy (see test-exec.sh)
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cmd="sh ${SRC}/sshd-log-wrapper.sh ${SSHD} ${TEST_SSH_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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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 | $OBJ/modpipe -m xor:$off:1"
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output=$(${SSH} -m $m -2F $OBJ/ssh_proxy -o "$pxy" \
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999.999.999.999 true 2>&1)
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if [ $? -eq 0 ]; then
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fail "ssh -m $m succeeds with bit-flip at $off"
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fi
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ecnt=$((ecnt+1))
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output=$(echo $output | tr -s '\r\n' '.')
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verbose "test $tid: $m @$off $output"
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case "$output" in
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Bad?packet*) elen=$((elen+1)); skip=2;;
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Corrupted?MAC*) emac=$((emac+1)); skip=0;;
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padding*) epad=$((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=$((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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