Redirect all logs to logfile
This commit is contained in:
Pratik
@@ -1,23 +1,33 @@
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#!/etc/bin/env bash
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# Accept user name as a script argument
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# If no username provided
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# generate a random username - all lowercase
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# Something important fails
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# Revert everything back to how it was
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# Redirect every output to a logfile
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# Ask the user to NOT logout yet
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# Ask him to report back if he can login using the new user -with the ssh-private key
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# If not
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# Ask the user to NOT logout yet and login as normal user
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# If he can - great
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# Remove the SSH-only login and ask the user to login using password
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# If he can - great - tell him to talk to the server provider's support to get help regarding SSH-only access
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# Report the things
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# Report
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# Root password
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# User Password
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# User SSH-Private Key
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# User SSH-Public key
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# Display the root-user's new password on screen
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# If not
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# Ask him to report back if he can login using the new user -with the ssh-private key
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# - tell him to talk to the server provider's support to get help regarding SSH-only access
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# What to do if making .bkp file fails?
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# Add timestamp to all backup files filename.071218_171731_bak
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#Test
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# 1 - Deb 9.x
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# 2 - Deb 8.x
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# 3 - Ubuntu 14.x
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# 4 - Ubuntu 16.x
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# 5 - Ubuntu 18.x
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# DigitalOcean
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# OVH
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# Hetzner
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SCRIPT_NAME=server_harden
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SCRIPT_VERSION=0.2
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LOGFILE=/tmp/"$SCRIPT_NAME"_v"$SCRIPT_VERSION".log
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##############################################################
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# Basic checks before starting
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@@ -25,30 +35,22 @@
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# No root - no good
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[ "$(id -u)" != "0" ] && {
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echo "Error: You must be root to run this script, please login as root and execute the script again."
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printf "ERROR: You must be root to run this script.\\nPlease login as root and execute the script again."
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exit 1
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}
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# Check supported OSes
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if [[ $(sed 's/\..*//' /etc/debian_version) -eq 8 ]]; then
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if [[ $(cut -d. -f 1 < /etc/debian_version) -eq 8 ]]; then
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DEB_VER_STR="jessie"
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elif [[ $(sed 's/\..*//' /etc/debian_version) -eq 9 ]]; then
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elif [[ $(cut -d. -f 1 < /etc/debian_version) -eq 9 ]]; then
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DEB_VER_STR="stretch"
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else
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printf "This version of Debian is NOT supported.\\n"
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printf "This script only supports Debian Stretch (9.x) and Debian Jessie (8.x).\\n"
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printf "Your OS is NOT supported.\\n"
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exit 1
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fi
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##############################################################
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# Display what the script does
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##############################################################
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# What to do if something fails
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# Catastophic failure
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# Ignorable failure
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# Where to find the log file
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##############################################################
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# Gather info
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##############################################################
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@@ -58,21 +60,34 @@ fi
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clear
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echo "Do you want to change root password ? (y/n)"
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echo "(You might want to do this if you received it as an email from your host.)"
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while [[ $RESET_ROOT_PWD != "y" && $RESET_ROOT_PWD != "n" ]]; do
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read -rp "Select an option [1-2]: " RESET_ROOT_PWD
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while [[ $RESET_ROOT_PWD != "y" && $RESET_ROOT_PWD != "n" ]]; do
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read -rp "Select an option (y/n): " RESET_ROOT_PWD
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RESET_ROOT_PWD=$(echo "$RESET_ROOT_PWD" | head -c 1)
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done
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# Ask for a user name
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echo ""
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echo "A new non-root user will be created for you."
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read -rp "Please provide a user name - " NORM_USER_NAME
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# If the user exists - ask for a different username
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while [[ ! "$NORM_USER_NAME" ]] && [[ $(getent passwd "$NORM_USER_NAME" | wc -l) -gt 0 ]]; do
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echo "User name either already exists or you provided an invalid username."
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read -rp "Please provide a user name - " NORM_USER_NAME
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echo "Allow this script to randomly generate a username for you ? (y/n)"
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while [[ $AUTO_GEN_USERNAME != "y" && $AUTO_GEN_USERNAME != "n" ]]; do
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read -rp "Select an option (y/n): " AUTO_GEN_USERNAME
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done
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if [[ $AUTO_GEN_USERNAME == 'n' ]]; then
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while [[ ! "$NORM_USER_NAME" ]]; do
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printf "Please provide a user name - \\n"
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printf "%2s - [a-zA-Z0-9] [-] [_] are allowed\\n%2s - NO special characters.\\n%2s - NO spaces.\\n:" " " " " " "
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read -r NORM_USER_NAME
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# If the user exists or invalid characters - ask for a different username
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if [[ $(echo "$NORM_USER_NAME" | grep -Pnc '^[a-zA-Z0-9_-]+$') -eq 0 ]] ||
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[[ $(getent passwd "$NORM_USER_NAME" | wc -l) -gt 0 ]]; then
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NORM_USER_NAME=""
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printf "%2s !!! User name already exists or \\n%2s !!! Invalid characters in the User name.\\n" " " " "
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continue
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fi
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done
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else
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echo ""
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fi
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##############################################################
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# Log
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@@ -84,10 +99,9 @@ CRED="${CSI}1;31m"
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CGREEN="${CSI}1;32m"
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CVERTICAL="|"
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CHORIZONTAL="_"
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SCRIPT_NAME=server_harden
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SCRIPT_VERSION=0.2
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LOGFILE=/tmp/"$SCRIPT_NAME"_v"$SCRIPT_VERSION".log
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# Reset privilous log file
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printf "" > "$LOGFILE"
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function horizontal_fill() {
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local char=$1
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@@ -118,6 +132,10 @@ function recap (){
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}
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function finally(){
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# Check if $what_failed is one of the catastrophic failures
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# if - Catastrofic failure - Check if any .bkp file exist and revert them to original
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# Let user know nothing was changed
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# if - Non-catastrophic failure - Inform user of side effects
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#local what_failed=$1
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line_fill "$CHORIZONTAL" 60
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@@ -130,22 +148,26 @@ function finally(){
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line_fill "$CHORIZONTAL" 60
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}
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function log() {
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function file_log(){
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printf "%s - %s\\n" "$(date '+%Y-%m-%d %H:%M:%S')" "$1" >> "$LOGFILE"
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}
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function op_log() {
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local EVENT=$1
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local RESULT=$2
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if [ "$RESULT" = "SUCCESSFUL" ]
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then
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printf "%30s %7s [${CGREEN}${RESULT}${CEND}]\\n" "$EVENT" " "
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echo "$(date '+%Y-%m-%d %H:%M:%S')" - "$EVENT" - "$RESULT" >> "$LOGFILE"
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printf "\r%30s %7s [${CGREEN}${RESULT}${CEND}]\\n" "$EVENT" " "
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file_log "${EVENT} - ${RESULT}"
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elif [ "$RESULT" = "FAILED" ]
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then
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printf "%30s %7s [${CRED}${RESULT}${CEND}]\\n" "$EVENT" " "
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printf "\r%30s %7s [${CRED}${RESULT}${CEND}]\\n" "$EVENT" " "
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printf "\\n\\nPlease look at %s\\n\\n" "$LOGFILE"
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echo "$(date '+%Y-%m-%d %H:%M:%S')" - "$EVENT" - "$RESULT" >> "$LOGFILE"
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file_log "${EVENT} - ${RESULT}"
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else
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printf "%30s %7s [${CRED}..${CEND}]\\r" "$EVENT" " "
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echo "$(date '+%Y-%m-%d %H:%M:%S')" - "$EVENT" - "begin..." >> "$LOGFILE"
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printf "%30s %7s [${CRED}..${CEND}]" "$EVENT" " "
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file_log "${EVENT} - begin..."
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fi
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}
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@@ -162,32 +184,80 @@ else
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fi
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if [[ $SESSION_TYPE == "remote/ssh" ]]; then
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printf "You are currently connected to an SSH session.\\n"
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file_log "Connected through SSH session."
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else
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printf "You are currently connected using password authentication.\\n"
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file_log "Connected using password authentication."
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fi
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##############################################################
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# Display what the script does
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##############################################################
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clear
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cat <<INFORM | more
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!!! READ BELOW & PRESS ENTER TO CONTINUE !!!
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##################################################################
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This script performs the following tasks :-
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1 - Change your root password (unless you have choosen NOT to)
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2 - Create a non-root user (unless provided by you a random
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username will be created)
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3 - Generate SSH keys on the server and store them at ~/.ssh
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4 - Adds the public key from the above step to
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~/.ssh/authorized_keys file
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5 - Restricts access to the SSH ~/.ssh folder
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6 - Restricts login method to SSH-only by editing
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/etc/ssh/sshd_config file to enable
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7 - Restores the /etc/apt/sources.list
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(Most server provider alter these to serve software from
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their CDNs)
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8 - Installs "sudo" "curl" "screen"
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9 - Display the following at the end
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a) root password (if changed)
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b) user name
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c) user password
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d) SSH Private Key
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e) SSH Public Key
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Before editing any file, script creates a back up of that file
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(filename.bak) in the same directory. If script detects any
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catastrophic error, then it restores the original files. Script
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assumes you are running this on a brand new VPS and that DATALOSS
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OR LOSS OF ACCESS TO THE SERVER IS NOT A MAJOR CONCERN. If you do
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however lose access to the server - most VPS provider allow to
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create a new one easily.
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A log file can be found at ${LOGFILE}
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TO CONTINUE (press any key)...
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TO EXIT (ctrl + c)...
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INFORM
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read -r
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clear
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##############################################################
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# Change root's password
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##############################################################
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if [[ $RESET_ROOT_PWD == 'y' ]]; then
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{
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log "Changing root password"
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op_log "Changing root password"
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# Generate a 15 character random password
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PASS_ROOT="$(< /dev/urandom tr -cd "[:alnum:]" | head -c 15)" || exit 1
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file_log "Generated Root Password - ${PASS_ROOT}"
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# Change root's password
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echo -e "${PASS_ROOT}\\n${PASS_ROOT}" | passwd > /dev/null
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}
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echo -e "${PASS_ROOT}\\n${PASS_ROOT}" | passwd
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} 2>> "$LOGFILE" >&2
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if [[ $? -eq 0 ]]; then
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log "Changing root password" "SUCCESSFUL"
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op_log "Changing root password" "SUCCESSFUL"
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else
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# Low priority - since we are disabling root login anyways
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log "Changing root password" "FAILED"
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op_log "Changing root password" "FAILED"
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fi
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fi
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@@ -196,22 +266,28 @@ fi
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# Create a normal user
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##############################################################
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{
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log "Creating new user"
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op_log "Creating new user"
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if [[ $AUTO_GEN_USERNAME == 'y' ]]; then
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NORM_USER_NAME="$(< /dev/urandom tr -cd 'a-z' | head -c 6)""$(< /dev/urandom tr -cd '0-9' | head -c 2)" || exit 1
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file_log "Generated user name - ${NORM_USER_NAME}"
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fi
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# Generate a 15 character random password
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USER_PASS="$(< /dev/urandom tr -cd "[:alnum:]" | head -c 15)" || exit 1
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file_log "Generated user password - ${USER_PASS}"
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# Create the user and assign the above password
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echo -e "${USER_PASS}\\n${USER_PASS}" | adduser "$NORM_USER_NAME" -q --gecos "First Last,RoomNumber,WorkPhone,HomePhone" 2> /dev/null
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echo -e "${USER_PASS}\\n${USER_PASS}" | adduser "$NORM_USER_NAME" -q --gecos "First Last,RoomNumber,WorkPhone,HomePhone"
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# Give root privilages to the above user
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usermod -aG sudo "$NORM_USER_NAME" || exit 1
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}
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} 2>> "$LOGFILE" >&2
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if [[ $? -eq 0 ]]; then
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log "Creating new user" "SUCCESSFUL"
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op_log "Creating new user" "SUCCESSFUL"
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else
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log "Creating new user" "FAILED"
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op_log "Creating new user" "FAILED"
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finally "CNU"
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exit 1;
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fi
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@@ -221,11 +297,13 @@ fi
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# Create SSH Key for the new user
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##############################################################
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{
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log "Creating SSH Key for new user"
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op_log "Creating SSH Key for new user"
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shopt -s nullglob
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KEY_FILES=("$SSH_DIR"/"$NORM_USER_NAME".pem*)
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#TODO - If SSH files already exist - rename them to .timestamp_bkp
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# Create key file only if it does NOT exist
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if [[ ! ${KEY_FILES[0]} ]]; then
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SSH_DIR=/home/"$NORM_USER_NAME"/.ssh
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@@ -233,17 +311,24 @@ fi
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# Generate a 15 character random password for key
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KEY_PASS="$(< /dev/urandom tr -cd "[:alnum:]" | head -c 15)" || exit 1
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file_log "Generated SSH Key Passphrase - ${KEY_PASS}"
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# Create a OpenSSH-compliant ed25519-type key
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ssh-keygen -a 1000 -o -t ed25519 -N "$KEY_PASS" -C "$NORM_USER_NAME" -f "$SSH_DIR"/"$NORM_USER_NAME".pem -q || exit 1
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# See if the files actually got created
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KEY_FILES=("$SSH_DIR"/"$NORM_USER_NAME".pem*)
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if [[ ${#KEY_FILES[@]} -eq 0 ]]; then
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file_log "Unknown error occured."
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file_log "Could not create SSH key files."
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exit 1
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fi
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}
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fi
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} 2>> "$LOGFILE" >&2
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if [[ $? -eq 0 ]]; then
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log "Creating SSH Key for new user" "SUCCESSFUL"
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op_log "Creating SSH Key for new user" "SUCCESSFUL"
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else
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log "Creating SSH Key for new user" "FAILED"
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op_log "Creating SSH Key for new user" "FAILED"
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finally "CSK"
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exit 1;
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fi
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@@ -253,15 +338,18 @@ fi
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# Add generated key to authorized_keys file
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##############################################################
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{
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log "Adding SSH Key to 'authorized_keys' file"
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op_log "Adding SSH Key to 'authorized_keys' file"
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# Create authorized_keys if it does not exist yet
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touch "$SSH_DIR"/authorized_keys
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# Insert the public key into "authoried_keys" file
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cat "${KEY_FILES[1]}" >> "$SSH_DIR"/authorized_keys || exit 1
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}
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} 2>> "$LOGFILE" >&2
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if [[ $? -eq 0 ]]; then
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log "Adding SSH Key to 'authorized_keys' file" "SUCCESSFUL"
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op_log "Adding SSH Key to 'authorized_keys' file" "SUCCESSFUL"
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else
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log "Adding SSH Key to 'authorized_keys' file" "FAILED"
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op_log "Adding SSH Key to 'authorized_keys' file" "FAILED"
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finally "ATAF"
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exit 1;
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fi
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@@ -271,7 +359,7 @@ fi
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# Secure authorized_keys file
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##############################################################
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{
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log "Securing 'authorized_keys' file"
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op_log "Securing 'authorized_keys' file"
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# Set appropriate permissions for ".ssh" dir and "authorized_key" file
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chown -R "$NORM_USER_NAME" "$SSH_DIR" && \
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@@ -279,11 +367,14 @@ fi
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chmod 700 "$SSH_DIR" && \
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chmod 400 "$SSH_DIR"/authorized_keys && \
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chattr +i "$SSH_DIR"/authorized_keys
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}
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} 2>> "$LOGFILE" >&2
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if [[ $? -eq 0 ]]; then
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log "Securing 'authorized_keys' file" "SUCCESSFUL"
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op_log "Securing 'authorized_keys' file" "SUCCESSFUL"
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else
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log "Securing 'authorized_keys' file" "FAILED"
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file_log "Setting restrictive permissions for '~/.ssh/' directory failed"
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file_log "Please do 'ls -lAh ~/.ssh/' and check manually to see what went wrong."
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file_log "Rest of the tasks will continue."
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op_log "Securing 'authorized_keys' file" "FAILED"
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fi
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@@ -368,7 +459,7 @@ function set_config_key(){
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}
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{
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log "Enabling SSH-only login"
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op_log "Enabling SSH-only login"
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# Backup the sshd_config file
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cp /etc/ssh/sshd_config /etc/ssh/sshd_config.bak || exit 1
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@@ -383,11 +474,11 @@ function set_config_key(){
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set_config_key "/etc/ssh/sshd_config" "AuthorizedKeysFile" '%h\/\.ssh\/authorized_keys'
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systemctl restart sshd
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}
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} 2>> "$LOGFILE" >&2
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if [[ $? -eq 0 ]]; then
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log "Enabling SSH-only login" "SUCCESSFUL"
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op_log "Enabling SSH-only login" "SUCCESSFUL"
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else
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log "Enabling SSH-only login" "FAILED"
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op_log "Enabling SSH-only login" "FAILED"
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finally "ESOL"
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exit 1;
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fi
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@@ -398,10 +489,10 @@ fi
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##############################################################
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# Low priority - But what to do if it fails???
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log "Changing urls in sources.list to defaults"
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op_log "Changing urls in sources.list to defaults"
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mv /etc/apt/sources.list /etc/apt/sources.list.bak
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sed -i "1,$(wc -l < /etc/apt/sources.list.bak) s/^/#/" /etc/apt/sources.list.bak
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mv /etc/apt/sources.list /etc/apt/sources.list.bak 2>> "$LOGFILE" >&2
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sed -i "1,$(wc -l < /etc/apt/sources.list.bak) s/^/#/" /etc/apt/sources.list.bak 2>> "$LOGFILE" >&2
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# Default sources list for debian
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cat <<TAG > /etc/apt/sources.list || exit 1
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@@ -421,37 +512,44 @@ deb-src https://deb.debian.org/debian ${DEB_VER_STR}-backports main
|
||||
TAG
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||||
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# Find any additional sources listed by the provider and comment them out
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SOURCE_FILES=(/etc/apt/source*/*.list)
|
||||
SOURCE_FILES=(/etc/apt/source*/*.list) 2>> "$LOGFILE" >&2
|
||||
if [[ ${#SOURCE_FILES[@]} -gt 0 ]]; then
|
||||
for file in "${SOURCE_FILES[@]}";
|
||||
do
|
||||
mv "$file" "$file".bak
|
||||
sed -i "1,$(wc -l < "$file") s/^/#/" "$file" >&2 /dev/null
|
||||
mv "$file" "$file".bak 2>> "$LOGFILE" >&2
|
||||
sed -i "1,$(wc -l < "$file") s/^/#/" "$file" 2>> "$LOGFILE" >&2
|
||||
done
|
||||
fi
|
||||
|
||||
# Comment out cloud-init generated templates for sources
|
||||
CLOUD_INIT_FILES=(/etc/cloud/templates*/*.tmpl)
|
||||
CLOUD_INIT_FILES=(/etc/cloud/templates*/*.tmpl) 2>> "$LOGFILE" >&2
|
||||
if [[ ${#CLOUD_INIT_FILES[@]} -gt 0 ]]; then
|
||||
for file in "${CLOUD_INIT_FILES[@]}";
|
||||
do
|
||||
mv "$file" "$file".bak
|
||||
sed -i "1,$(wc -l < "$file") s/^/#/" "$file" >&2 /dev/null
|
||||
mv "$file" "$file".bak 2>> "$LOGFILE" >&2
|
||||
sed -i "1,$(wc -l < "$file") s/^/#/" "$file" 2>> "$LOGFILE" >&2
|
||||
done
|
||||
fi
|
||||
|
||||
if [[ $? -eq 0 ]]; then
|
||||
log "Changing urls in sources.list to defaults" "FAILED"
|
||||
op_log "Changing urls in sources.list to defaults" "FAILED"
|
||||
else
|
||||
log "Changing urls in sources.list to defaults" "FAILED"
|
||||
op_log "Changing urls in sources.list to defaults" "FAILED"
|
||||
fi
|
||||
|
||||
|
||||
##############################################################
|
||||
# Install required softwares
|
||||
##############################################################
|
||||
apt-get update && apt-get upgrade -y && apt-get install -y sudo curl screen
|
||||
|
||||
{
|
||||
op_log "Installing required softwares"
|
||||
apt-get update && apt-get upgrade -y && apt-get install -y sudo curl screen 2>> "$LOGFILE" >&2
|
||||
}
|
||||
if [[ $? -eq 0 ]]; then
|
||||
op_log "Installing required softwares" "FAILED"
|
||||
else
|
||||
op_log "Installing required softwares" "FAILED"
|
||||
fi
|
||||
|
||||
##############################################################
|
||||
# Recap
|
||||
|
||||
Reference in New Issue
Block a user