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# $OpenBSD: hostkey-agent.sh,v 1.8 2019/11/01 01:55:41 djm Exp $
# Placed in the Public Domain.
tid="hostkey agent"
rm -f $OBJ/agent-key.* $OBJ/ssh_proxy.orig $OBJ/known_hosts.orig
trace "start agent"
eval `${SSHAGENT} -s` > /dev/null
r=$?
[ $r -ne 0 ] && fatal "could not start ssh-agent: exit code $r"
grep -vi 'hostkey' $OBJ/sshd_proxy > $OBJ/sshd_proxy.orig
echo "HostKeyAgent $SSH_AUTH_SOCK" >> $OBJ/sshd_proxy.orig
trace "load hostkeys"
for k in `${SSH} -Q key-plain | grep -v ^sk-` ; do
${SSHKEYGEN} -qt $k -f $OBJ/agent-key.$k -N '' || fatal "ssh-keygen $k"
(
printf 'localhost-with-alias,127.0.0.1,::1 '
cat $OBJ/agent-key.$k.pub
) >> $OBJ/known_hosts.orig
${SSHADD} $OBJ/agent-key.$k >/dev/null 2>&1 || \
fatal "couldn't load key $OBJ/agent-key.$k"
echo "Hostkey $OBJ/agent-key.${k}" >> $OBJ/sshd_proxy.orig
# Remove private key so the server can't use it.
rm $OBJ/agent-key.$k || fatal "couldn't rm $OBJ/agent-key.$k"
done
cp $OBJ/known_hosts.orig $OBJ/known_hosts
unset SSH_AUTH_SOCK
for ps in no yes; do
for k in `${SSH} -Q key-plain | grep -v ^sk-` ; do
verbose "key type $k privsep=$ps"
cp $OBJ/sshd_proxy.orig $OBJ/sshd_proxy
echo "UsePrivilegeSeparation $ps" >> $OBJ/sshd_proxy
echo "HostKeyAlgorithms $k" >> $OBJ/sshd_proxy
opts="-oHostKeyAlgorithms=$k -F $OBJ/ssh_proxy"
cp $OBJ/known_hosts.orig $OBJ/known_hosts
SSH_CONNECTION=`${SSH} $opts host 'echo $SSH_CONNECTION'`
if [ $? -ne 0 ]; then
fail "privsep=$ps failed"
fi
if [ "$SSH_CONNECTION" != "UNKNOWN 65535 UNKNOWN 65535" ]; then
fail "bad SSH_CONNECTION key type $k privsep=$ps"
fi
done
done
trace "kill agent"
${SSHAGENT} -k > /dev/null
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