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# $OpenBSD: putty-kex.sh,v 1.11 2024/02/09 08:56:59 dtucker Exp $
# Placed in the Public Domain.
tid="putty KEX"
puttysetup
cp ${OBJ}/sshd_proxy ${OBJ}/sshd_proxy_bak
# Enable group1, which PuTTY now disables by default
echo "KEX=dh-group1-sha1" >>${OBJ}/.putty/sessions/localhost_proxy
# Grepping algos out of the binary is pretty janky, but AFAIK there's no way
# to query supported algos.
kex=""
for k in `$SSH -Q kex`; do
if strings "${PLINK}" | grep -E "^${k}$" >/dev/null; then
kex="${kex} ${k}"
else
trace "omitting unsupported KEX ${k}"
fi
done
for k in ${kex}; do
verbose "$tid: kex $k"
cp ${OBJ}/sshd_proxy_bak ${OBJ}/sshd_proxy
echo "KexAlgorithms ${k}" >>${OBJ}/sshd_proxy
env HOME=$PWD ${PLINK} -v -load localhost_proxy -batch -i ${OBJ}/putty.rsa2 true \
2>${OBJ}/log/putty-kex-$k.log
if [ $? -ne 0 ]; then
fail "KEX $k failed"
fi
kexmsg=`grep -E '^Doing.* key exchange' ${OBJ}/log/putty-kex-$k.log`
trace putty: ${kexmsg}
done
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