#!/bin/bash
# Copyright (C) 2011-2013 OpenStack Foundation
# Copyright 2016 Red Hat, Inc.
#
# 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.

if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
    set -x
fi
set -eu
set -o pipefail

# NOTE(pabelanger): Glean configures access for root user, so allow us to
# properly login.
sed -i -e'/PermitRootLogin/d' /etc/ssh/sshd_config \
    && echo "PermitRootLogin yes" >> /etc/ssh/sshd_config

# NOTE(clarkb): Glean configures ssh keys only and not passwords. Disable
# unnecessary password auth.
sed -i -e '/PasswordAuthentication/d' /etc/ssh/sshd_config \
    && echo "PasswordAuthentication no" >> /etc/ssh/sshd_config

# NOTE(clarkb): SSH scanners may be affecting Zuul ssh connectivity
# Default LoginGraceTime is 120. Reduce that to 30 to cycle connections more
# quickly.
sed -i -e '/LoginGraceTime/d' /etc/ssh/sshd_config \
    && echo "LoginGraceTime 30" >> /etc/ssh/sshd_config

# NOTE(clarkb): SSH scanners may be affecting Zuul ssh connectivity
# Default MaxStartups is 10:30:100 which means after 10 unauthenticated
# connections randomly drop 30% of connections with an increasing
# percentage until 100 connections is reached.
sed -i -e '/MaxStartups/d' /etc/ssh/sshd_config \
    && echo "MaxStartups 30:10:100" >> /etc/ssh/sshd_config