1# $OpenBSD: dhgex.sh,v 1.7 2020/12/21 22:48:41 dtucker Exp $ 2# Placed in the Public Domain. 3 4tid="dhgex" 5 6LOG=${TEST_SSH_LOGFILE} 7rm -f ${LOG} 8cp $OBJ/sshd_proxy $OBJ/sshd_proxy_bak 9 10kexs=`${SSH} -Q kex | grep diffie-hellman-group-exchange` 11 12ssh_test_dhgex() 13{ 14 bits="$1"; shift 15 cipher="$1"; shift 16 kex="$1"; shift 17 18 cp $OBJ/sshd_proxy_bak $OBJ/sshd_proxy 19 echo "KexAlgorithms=$kex" >> $OBJ/sshd_proxy 20 echo "Ciphers=$cipher" >> $OBJ/sshd_proxy 21 rm -f ${LOG} 22 opts="-oKexAlgorithms=$kex -oCiphers=$cipher" 23 min=2048 24 max=8192 25 groupsz="$min<$bits<$max" 26 verbose "$tid bits $bits $kex $cipher" 27 ${SSH} ${opts} $@ -vvv -F ${OBJ}/ssh_proxy somehost true 28 if [ $? -ne 0 ]; then 29 fail "ssh failed ($@)" 30 fi 31 # check what we request 32 grep "SSH2_MSG_KEX_DH_GEX_REQUEST($groupsz) sent" ${LOG} >/dev/null 33 if [ $? != 0 ]; then 34 got=`egrep "SSH2_MSG_KEX_DH_GEX_REQUEST(.*) sent" ${LOG}` 35 fail "$tid unexpected GEX sizes, expected $groupsz, got $got" 36 fi 37 # check what we got. 38 gotbits="`awk 'BEGIN{FS="/"}/bits set:/{print $2}' ${LOG} | 39 head -1 | tr -d '\r\n'`" 40 trace "expected '$bits' got '$gotbits'" 41 if [ -z "$gotbits" ] || [ "$gotbits" -lt "$bits" ]; then 42 fatal "$tid expected $bits bit group, got $gotbits" 43 fi 44} 45 46check() 47{ 48 bits="$1"; shift 49 50 for c in $@; do 51 for k in $kexs; do 52 ssh_test_dhgex $bits $c $k 53 done 54 done 55} 56 57check 3072 3des-cbc # 112 bits. 58check 3072 `${SSH} -Q cipher | grep 128` 59check 7680 `${SSH} -Q cipher | grep 192` 60check 8192 `${SSH} -Q cipher | grep 256` 61check 8192 chacha20-poly1305@openssh.com 62