# Copyright 2021 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Force protocol v2 only
Protocol 2

# Enable both IPv4 and IPv6
AddressFamily any

# /etc is read-only.  Fetch keys from stateful partition
# Not using v1, so no v1 key
HostKey /mnt/stateful_partition/etc/ssh/ssh_host_rsa_key
HostKey /mnt/stateful_partition/etc/ssh/ssh_host_ed25519_key

PasswordAuthentication no
ChallengeResponseAuthentication no
PermitRootLogin no
UsePAM yes

PrintMotd no
PrintLastLog no
UseDns no
Subsystem sftp internal-sftp

PermitTunnel no
AllowTcpForwarding yes
X11Forwarding no

Ciphers aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr

# Compute times out connections after 10 minutes of inactivity.  Keep alive
# ssh connections by sending a packet every 7 minutes.
ClientAliveInterval 420

AcceptEnv EDITOR LANG LC_ALL PAGER TZ