mirror of
git://anongit.mindrot.org/openssh.git
synced 2024-12-28 04:52:07 +00:00
81 lines
2.9 KiB
Bash
81 lines
2.9 KiB
Bash
# $OpenBSD: limit-keytype.sh,v 1.1 2015/01/13 07:49:49 djm Exp $
|
|
# Placed in the Public Domain.
|
|
|
|
tid="restrict pubkey type"
|
|
|
|
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 rsa -f $OBJ/user_key2 || \
|
|
fatal "ssh-keygen failed"
|
|
${SSHKEYGEN} -q -N '' -t rsa -f $OBJ/user_key3 || \
|
|
fatal "ssh-keygen failed"
|
|
${SSHKEYGEN} -q -s $OBJ/user_ca_key -I "regress user key for $USER" \
|
|
-z $$ -n ${USER},mekmitasdigoat $OBJ/user_key3 ||
|
|
fatal "couldn't sign user_key1"
|
|
# Copy the private key alongside the cert to allow better control of when
|
|
# it is offered.
|
|
mv $OBJ/user_key3-cert.pub $OBJ/cert_user_key3.pub
|
|
cp -p $OBJ/user_key3 $OBJ/cert_user_key3
|
|
|
|
grep -v IdentityFile $OBJ/ssh_proxy.orig > $OBJ/ssh_proxy
|
|
|
|
opts="-oProtocol=2 -F $OBJ/ssh_proxy -oIdentitiesOnly=yes"
|
|
fullopts="$opts -i $OBJ/cert_user_key3 -i $OBJ/user_key1 -i $OBJ/user_key2"
|
|
|
|
echo mekmitasdigoat > $OBJ/authorized_principals_$USER
|
|
cat $OBJ/user_key1.pub > $OBJ/authorized_keys_$USER
|
|
cat $OBJ/user_key2.pub >> $OBJ/authorized_keys_$USER
|
|
|
|
prepare_config() {
|
|
(
|
|
grep -v "Protocol" $OBJ/sshd_proxy.orig
|
|
echo "Protocol 2"
|
|
echo "AuthenticationMethods publickey"
|
|
echo "TrustedUserCAKeys $OBJ/user_ca_key.pub"
|
|
echo "AuthorizedPrincipalsFile $OBJ/authorized_principals_%u"
|
|
for x in "$@" ; do
|
|
echo "$x"
|
|
done
|
|
) > $OBJ/sshd_proxy
|
|
}
|
|
|
|
prepare_config
|
|
|
|
# Check we can log in with all key types.
|
|
${SSH} $opts -i $OBJ/cert_user_key3 proxy true || fatal "cert failed"
|
|
${SSH} $opts -i $OBJ/user_key1 proxy true || fatal "key1 failed"
|
|
${SSH} $opts -i $OBJ/user_key2 proxy true || fatal "key2 failed"
|
|
|
|
# Allow plain Ed25519 and RSA. The certificate should fail.
|
|
verbose "privsep=$privsep allow rsa,ed25519"
|
|
prepare_config "PubkeyAcceptedKeyTypes ssh-rsa,ssh-ed25519"
|
|
${SSH} $opts -i $OBJ/cert_user_key3 proxy true && fatal "cert succeeded"
|
|
${SSH} $opts -i $OBJ/user_key1 proxy true || fatal "key1 failed"
|
|
${SSH} $opts -i $OBJ/user_key2 proxy true || fatal "key2 failed"
|
|
|
|
# Allow Ed25519 only.
|
|
verbose "privsep=$privsep allow ed25519"
|
|
prepare_config "PubkeyAcceptedKeyTypes ssh-ed25519"
|
|
${SSH} $opts -i $OBJ/cert_user_key3 proxy true && fatal "cert succeeded"
|
|
${SSH} $opts -i $OBJ/user_key1 proxy true || fatal "key1 failed"
|
|
${SSH} $opts -i $OBJ/user_key2 proxy true && fatal "key2 succeeded"
|
|
|
|
# Allow all certs. Plain keys should fail.
|
|
verbose "privsep=$privsep allow cert only"
|
|
prepare_config "PubkeyAcceptedKeyTypes ssh-*-cert-v01@openssh.com"
|
|
${SSH} $opts -i $OBJ/cert_user_key3 proxy true || fatal "cert failed"
|
|
${SSH} $opts -i $OBJ/user_key1 proxy true && fatal "key1 succeeded"
|
|
${SSH} $opts -i $OBJ/user_key2 proxy true && fatal "key2 succeeded"
|
|
|