# $OpenBSD: dhgex.sh,v 1.3 2015/10/23 02:22:01 dtucker Exp $
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# Placed in the Public Domain.
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tid="dhgex"
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LOG=${TEST_SSH_LOGFILE}
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rm -f ${LOG}
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cp $OBJ/sshd_proxy $OBJ/sshd_proxy_bak
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kexs=`${SSH} -Q kex | grep diffie-hellman-group-exchange`
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ssh_test_dhgex()
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{
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bits="$1"; shift
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cipher="$1"; shift
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kex="$1"; shift
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cp $OBJ/sshd_proxy_bak $OBJ/sshd_proxy
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echo "KexAlgorithms=$kex" >> $OBJ/sshd_proxy
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echo "Ciphers=$cipher" >> $OBJ/sshd_proxy
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rm -f ${LOG}
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opts="-oKexAlgorithms=$kex -oCiphers=$cipher"
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min=2048
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max=8192
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groupsz="$min<$bits<$max"
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verbose "$tid bits $bits $kex $cipher"
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${SSH} ${opts} $@ -vvv -F ${OBJ}/ssh_proxy somehost true
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if [ $? -ne 0 ]; then
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fail "ssh failed ($@)"
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fi
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# check what we request
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grep "SSH2_MSG_KEX_DH_GEX_REQUEST($groupsz) sent" ${LOG} >/dev/null
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if [ $? != 0 ]; then
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got=`egrep "SSH2_MSG_KEX_DH_GEX_REQUEST(.*) sent" ${LOG}`
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fail "$tid unexpected GEX sizes, expected $groupsz, got $got"
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fi
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# check what we got (depends on contents of system moduli file)
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gotbits="`awk '/bits set:/{print $4}' ${LOG} | head -1 | cut -f2 -d/`"
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if [ "$gotbits" -lt "$bits" ]; then
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fatal "$tid expected $bits bit group, got $gotbits"
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fi
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}
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check()
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{
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bits="$1"; shift
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for c in $@; do
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for k in $kexs; do
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ssh_test_dhgex $bits $c $k
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done
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done
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}
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#check 2048 3des-cbc
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check 3072 `${SSH} -Q cipher | grep 128`
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check 3072 arcfour blowfish-cbc
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check 7680 `${SSH} -Q cipher | grep 192`
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check 8192 `${SSH} -Q cipher | grep 256`
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check 8192 rijndael-cbc@lysator.liu.se chacha20-poly1305@openssh.com
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