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Diffstat (limited to 'regress/integrity.sh')
| -rw-r--r-- | regress/integrity.sh | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/regress/integrity.sh b/regress/integrity.sh new file mode 100644 index 0000000..202483c --- /dev/null +++ b/regress/integrity.sh @@ -0,0 +1,76 @@ +# $OpenBSD: integrity.sh,v 1.25 2023/03/01 09:29:32 dtucker Exp $ +# Placed in the Public Domain. + +tid="integrity" +cp $OBJ/sshd_proxy $OBJ/sshd_proxy_bak + +# start at byte 2900 (i.e. after kex) and corrupt at different offsets +tries=10 +startoffset=2900 +macs=`${SSH} -Q mac` +# The following are not MACs, but ciphers with integrated integrity. They are +# handled specially below. +macs="$macs `${SSH} -Q cipher-auth`" + +# avoid DH group exchange as the extra traffic makes it harder to get the +# offset into the stream right. +#echo "KexAlgorithms -diffie-hellman-group*" \ +# >> $OBJ/ssh_proxy + +# sshd-command for proxy (see test-exec.sh) +cmd="$SUDO env SSH_SK_HELPER="$SSH_SK_HELPER" sh ${OBJ}/sshd-log-wrapper.sh -i -f $OBJ/sshd_proxy" + +for m in $macs; do + trace "test $tid: mac $m" + elen=0 + epad=0 + emac=0 + etmo=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 + cp $OBJ/sshd_proxy_bak $OBJ/sshd_proxy + # modify output from sshd at offset $off + pxy="proxycommand=$cmd | $OBJ/modpipe -wm xor:$off:1" + if ${SSH} -Q cipher-auth | grep "^${m}\$" >/dev/null 2>&1 ; then + echo "Ciphers=$m" >> $OBJ/sshd_proxy + macopt="-c $m" + else + echo "Ciphers=aes128-ctr" >> $OBJ/sshd_proxy + echo "MACs=$m" >> $OBJ/sshd_proxy + macopt="-m $m -c aes128-ctr" + fi + verbose "test $tid: $m @$off" + ${SSH} $macopt -F $OBJ/ssh_proxy -o "$pxy" \ + -oServerAliveInterval=1 -oServerAliveCountMax=30 \ + 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 $ecnt + 1` + out=$(egrep -v "^debug" $TEST_SSH_LOGFILE | tail -2 | \ + tr -s '\r\n' '.') + case "$out" in + Bad?packet*) elen=`expr $elen + 1`; skip=3;; + Corrupted?MAC* | *message?authentication?code?incorrect*) + emac=`expr $emac + 1`; skip=0;; + padding*) epad=`expr $epad + 1`; skip=0;; + *Timeout,?server*) + etmo=`expr $etmo + 1`; skip=0;; + *) fail "unexpected error mac $m at $off: $out";; + esac + done + verbose "test $tid: $ecnt errors: mac $emac padding $epad length $elen timeout $etmo" + if [ $emac -eq 0 ]; then + fail "$m: no mac errors" + fi + expect=`expr $ecnt - $epad - $elen - $etmo` + if [ $emac -ne $expect ]; then + fail "$m: expected $expect mac errors, got $emac" + fi +done |