Unitoo/secure-reverse-ssh-tunnel
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better setup script

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This commit is contained in:
Claudio Maradonna 2020-07-31 16:18:50 +02:00
parent fe0aa9e412
commit dd4fc8d0b2
Signed by: claudiomaradonna
GPG Key ID: 0CBA58694C5680D9
1 changed files with 90 additions and 55 deletions
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79
setup-remote-host.sh
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@ -1,33 +1,53 @@
#!/bin/bash
read -p "Did you run this script on the remote host? " -n 1 -r
echo
if [[ ! $REPLY =~ ^[Yy]$ ]]
then
echo "Please rerun this script on the remote host as root user."
[[ "$0" = "$BASH_SOURCE" ]] && exit 1 || return 1
fi
read -p "Did you setup various targets and adjusted configurations as described in README?" -n 1 -r
echo
if [[ ! $REPLY =~ ^[Yy]$ ]]
then
echo "Please read README and rerun this script."
[[ "$0" = "$BASH_SOURCE" ]] && exit 1 || return 1
fi
REMOTE_USER="root"
function check_if_running_as_root {
if [[ $EUID -ne 0 ]]; then
echo "This script must be run as root."
exit 1
fi
echo "OK: Root user detected."
echo "NEXT: Checking for apt-get executable."
}
function check_necessary_packages {
echo "NEXT: Checking for valid package manager."
APT_GET_CMD=$(which apt-get)
YUM_CMD=$(which yum)
if [[ -z $APT_GET_CMD ]]; then
echo "No apt-get executable found. Exiting."
if [[ ! -z $APT_GET_CMD ]]; then
echo "OK: apt-get found."
apt-get --yes install autossh
elif [[ ! -z $YUM_CMD ]]; then
echo "OK: yum found."
yum install autossh
else
echo "No valid package manager found. Exiting."
exit 1;
fi
echo "OK: apt-get found."
echo "NEXT: Check and eventually install necessary packages."
REQUIRED_PKG="autossh"
PKG_OK=$(dpkg-query -W --showformat='${Status}\n' $REQUIRED_PKG|grep "install ok installed")
echo Checking for $REQUIRED_PKG: $PKG_OK
if [ "" = "$PKG_OK" ]; then
echo "No $REQUIRED_PKG. Setting up $REQUIRED_PKG."
apt-get --yes install $REQUIRED_PKG
fi
echo "OK: Autossh installed"
}
function check_for_autossh_user {
echo "NEXT: Check for existence of autossh dedicated user."
if [ ! id -u autossh >/dev/null 2>&1 ]; then
@ -39,25 +59,32 @@ if [ ! id -u autossh >/dev/null 2>&1 ]; then
echo "There are some problems with user creation. Exiting."
exit 1;
fi
}
echo "NEXT: Setup autossh home."
function adjust_ssh_folder_for {
homedir=$( getent passwd $REMOTE_USER | cut -d: -f6 )
mkdir -p "/home/autossh/.ssh"
touch -a /home/autossh/.ssh/authorized_keys
echo "NEXT: Setup ${1} home: ${homedir}."
mkdir -p "${homedir}/.ssh"
touch -a $homedir/.ssh/authorized_keys
if [ ! -s authorized_keys ]; then
echo "WARNING: authorized_keys in setup folder seems empty so you should manually setup host authorized_keys or rerun this script."
fi
cat authorized_keys >> /home/autossh/.ssh/authorized_keys
cat authorized_keys >> $homedir/.ssh/authorized_keys
echo "OK: Files and content ready."
echo "NEXT: Setup file and folder permissions."
chown -R autossh:autossh /home/autossh/.ssh
chmod 700 /home/autossh/.ssh
chmod 600 /home/autossh/.ssh/authorized_keys
chown -R $1:$1 $homedir/.ssh
chmod 700 $homedir/.ssh
chmod 600 $homedir/.ssh/authorized_keys
echo "OK: File and folder permissions setup."
}
function setup_systemd_service_if_available {
echo "NEXT: Checking for systemd."
SYSTEMCTL_CMD=$(which systemctl)
@ -76,6 +103,14 @@ if [[ ! -z $SYSTEMCTL_CMD ]]; then
else
echo "WARNING: No systemd installation found. You should manually setup an autossh service to keep tunnel alive."
fi
}
check_if_running_as_root
check_necessary_packages
check_for_autossh_user
adjust_ssh_folder_for ${REMOTE_USER}
setup_systemd_service_if_available
echo "All done. What you need to do now:\n"
echo "- generate an ssh keypair with ssh-keygen for user autossh and push signature to the jump server"