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# $OpenBSD: dhgex.sh,v 1.8 2023/03/02 08:14:52 dtucker Exp $
# Placed in the Public Domain.
tid="dhgex"
LOG=${TEST_SSH_LOGFILE}
rm -f ${LOG}
cp $OBJ/sshd_proxy $OBJ/sshd_proxy_bak
kexs=`${SSH} -Q kex | grep diffie-hellman-group-exchange`
ssh_test_dhgex()
{
bits="$1"; shift
cipher="$1"; shift
kex="$1"; shift
cp $OBJ/sshd_proxy_bak $OBJ/sshd_proxy
echo "KexAlgorithms=$kex" >> $OBJ/sshd_proxy
echo "Ciphers=$cipher" >> $OBJ/sshd_proxy
rm -f ${LOG}
opts="-oKexAlgorithms=$kex -oCiphers=$cipher"
min=2048
max=8192
groupsz="$min<$bits<$max"
verbose "$tid bits $bits $kex $cipher"
${SSH} ${opts} $@ -vvv -F ${OBJ}/ssh_proxy somehost true
if [ $? -ne 0 ]; then
fail "ssh failed ($@)"
fi
# check what we request
grep "SSH2_MSG_KEX_DH_GEX_REQUEST($groupsz) sent" ${LOG} >/dev/null
if [ $? != 0 ]; then
got="`egrep 'SSH2_MSG_KEX_DH_GEX_REQUEST(.*) sent' ${LOG}`"
fail "$tid unexpected GEX sizes, expected $groupsz, got '$got'"
fi
# check what we got.
gotbits="`awk 'BEGIN{FS="/"}/bits set:/{print $2}' ${LOG} |
head -1 | tr -d '\r\n'`"
trace "expected '$bits' got '$gotbits'"
if [ -z "$gotbits" ] || [ "$gotbits" -lt "$bits" ]; then
fatal "$tid expected $bits bit group, got $gotbits"
fi
}
check()
{
bits="$1"; shift
for c in $@; do
for k in $kexs; do
ssh_test_dhgex $bits $c $k
done
done
}
check 3072 3des-cbc # 112 bits.
check 3072 `${SSH} -Q cipher | grep 128`
check 7680 `${SSH} -Q cipher | grep 192`
check 8192 `${SSH} -Q cipher | grep 256`
check 8192 chacha20-poly1305@openssh.com
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