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-rw-r--r--regress/dhgex.sh61
1 files changed, 61 insertions, 0 deletions
diff --git a/regress/dhgex.sh b/regress/dhgex.sh
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+++ b/regress/dhgex.sh
@@ -0,0 +1,61 @@
+# $OpenBSD: dhgex.sh,v 1.6 2019/10/06 11:49:50 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 rijndael-cbc@lysator.liu.se chacha20-poly1305@openssh.com