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# $OpenBSD: multipubkey.sh,v 1.4 2021/06/07 01:16:34 djm Exp $
# Placed in the Public Domain.
tid="multiple pubkey"
rm -f $OBJ/authorized_keys_$USER $OBJ/user_ca_key* $OBJ/user_key*
rm -f $OBJ/authorized_principals_$USER $OBJ/cert_user_key*
mv $OBJ/sshd_proxy $OBJ/sshd_proxy.orig
mv $OBJ/ssh_proxy $OBJ/ssh_proxy.orig
# Create a CA key
${SSHKEYGEN} -q -N '' -t ed25519 -f $OBJ/user_ca_key ||\
fatal "ssh-keygen failed"
# Make some keys and a certificate.
${SSHKEYGEN} -q -N '' -t ed25519 -f $OBJ/user_key1 || \
fatal "ssh-keygen failed"
${SSHKEYGEN} -q -N '' -t ed25519 -f $OBJ/user_key2 || \
fatal "ssh-keygen failed"
${SSHKEYGEN} -q -s $OBJ/user_ca_key -I "regress user key for $USER" \
-z $$ -n ${USER},mekmitasdigoat $OBJ/user_key1 ||
fail "couldn't sign user_key1"
# Copy the private key alongside the cert to allow better control of when
# it is offered.
mv $OBJ/user_key1-cert.pub $OBJ/cert_user_key1.pub
cp -p $OBJ/user_key1 $OBJ/cert_user_key1
grep -v IdentityFile $OBJ/ssh_proxy.orig > $OBJ/ssh_proxy
opts="-oProtocol=2 -F $OBJ/ssh_proxy -oIdentitiesOnly=yes"
opts="$opts -i $OBJ/cert_user_key1 -i $OBJ/user_key1 -i $OBJ/user_key2"
for match in no yes ; do
(
cat $OBJ/sshd_proxy.orig
echo "Protocol 2"
echo "TrustedUserCAKeys $OBJ/user_ca_key.pub"
echo "AuthorizedPrincipalsFile $OBJ/authorized_principals_%u"
) > $OBJ/sshd_proxy
if test "$match" = "yes" ; then
echo "AuthenticationMethods none" >> $OBJ/sshd_proxy
echo "PubkeyAuthentication no" >> $OBJ/sshd_proxy
echo "Match all" >> $OBJ/sshd_proxy
echo "PubkeyAuthentication yes" >> $OBJ/sshd_proxy
fi
echo "AuthenticationMethods publickey,publickey" >> $OBJ/sshd_proxy
# Single key should fail.
trace "match $match single key"
rm -f $OBJ/authorized_principals_$USER
cat $OBJ/user_key1.pub > $OBJ/authorized_keys_$USER
${SSH} $opts proxy true && fail "ssh succeeded with key"
# Single key with same-public cert should fail.
trace "match $match pubkey + identical cert"
echo mekmitasdigoat > $OBJ/authorized_principals_$USER
cat $OBJ/user_key1.pub > $OBJ/authorized_keys_$USER
${SSH} $opts proxy true && fail "ssh succeeded with key+cert"
# Multiple plain keys should succeed.
trace "match $match multiple public"
rm -f $OBJ/authorized_principals_$USER
cat $OBJ/user_key1.pub $OBJ/user_key2.pub > \
$OBJ/authorized_keys_$USER
${SSH} $opts proxy true || fail "ssh failed with multiple keys"
# Cert and different key should succeed
# Key and different-public cert should succeed.
trace "match $match pubkey + different cert"
echo mekmitasdigoat > $OBJ/authorized_principals_$USER
cat $OBJ/user_key2.pub > $OBJ/authorized_keys_$USER
${SSH} $opts proxy true || fail "ssh failed with key/cert"
done
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