#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#
# Setup functions
#
# License
# =======
#
# Copyright (C) 2014-2016 Bob Mottram <bob@freedombone.net>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

if [ ! $PROJECT_NAME ]; then
    PROJECT_NAME='freedombone'
fi

DEFAULT_DOMAIN_NAME=
DEFAULT_DOMAIN_CODE=
MY_USERNAME=
if [ ! $SYSTEM_TYPE ]; then
    SYSTEM_TYPE="full"
fi

# An optional configuration file which overrides some of these variables
if [ ! $CONFIGURATION_FILE ]; then
    CONFIGURATION_FILE="$HOME/${PROJECT_NAME}.cfg"
fi

# Directory where source code is downloaded and compiled
INSTALL_DIR=$HOME/build

# device name for an attached usb drive
USB_DRIVE=/dev/sda1

# Location where the USB drive is mounted to
USB_MOUNT=/mnt/usb

# Number of days to keep backups for
BACKUP_MAX_DAYS=30

# file containing a list of remote locations to backup to
# Format: [username@friendsdomain//home/username] [ssh_password]
# With the only space character being between the server and the password
FRIENDS_SERVERS_LIST=/home/$MY_USERNAME/backup.list

export DEBIAN_FRONTEND=noninteractive

# used to limit CPU usage
CPULIMIT='/usr/bin/cpulimit -l 20 -e'

# command to create a git repository
CREATE_GIT_PROJECT_COMMAND='create-project'

# File which keeps track of what has already been installed
COMPLETION_FILE=$HOME/${PROJECT_NAME}-completed.txt

# log file where details of remote backups are stored
REMOTE_BACKUPS_LOG=/var/log/remotebackups.log

# message if something fails to install
CHECK_MESSAGE="Check your internet connection, /etc/network/interfaces and /etc/resolv.conf, then delete $COMPLETION_FILE, run 'rm -fR /var/lib/apt/lists/* && apt-get update --fix-missing' and run this script again. If hash sum mismatches persist then try setting $DEBIAN_REPO to a different mirror and also change /etc/apt/sources.list."

# Default diffie-hellman key length in bits
DH_KEYLENGTH=2048

function detect_usb_drive {
    # sets to the highest available drive letter
    # which is likely to be the last drive connected
    read_config_param USB_DRIVE
    partition_number='1'
    if [[ "$1" == "nopath" ]]; then
        partition_number=''
    fi
    if [ -b /dev/sdb${partition_number} ]; then
        USB_DRIVE=/dev/sdb${partition_number}
    fi
    if [ -b /dev/sdc${partition_number} ]; then
        USB_DRIVE=/dev/sdc${partition_number}
    fi
    if [ -b /dev/sdd${partition_number} ]; then
        USB_DRIVE=/dev/sdd${partition_number}
    fi
    if [ -b /dev/sde${partition_number} ]; then
        USB_DRIVE=/dev/sde${partition_number}
    fi
    if [ -b /dev/sdf${partition_number} ]; then
        USB_DRIVE=/dev/sdf${partition_number}
    fi
    if [ -b /dev/sdg${partition_number} ]; then
        USB_DRIVE=/dev/sdg${partition_number}
    fi
    if [ -b /dev/sdh${partition_number} ]; then
        USB_DRIVE=/dev/sdh${partition_number}
    fi
    write_config_param USB_DRIVE "$USB_DRIVE"
}

function running_as_root {
    if [[ $EUID != 0 ]] ; then
        echo "0"
    else
        echo "1"
    fi
}

function reset_usb_devices {
    for xhci in /sys/bus/pci/drivers/?hci-pci ; do

        if ! cd $xhci ; then
            return
        fi

        echo "Resetting devices from $xhci..."

        for i in ????:??:??.? ; do
            echo -n "$i" > unbind
            echo -n "$i" > bind
        done
    done
    udevadm control --reload-rules
}

function install_backports_kernel {
    # install backports kernel if possible
    architecture_type=$(uname -a)

    if [[ "$architecture_type" == *"amd64"* ]]; then
        apt-get -yq install linux-image-amd64 -t jessie-backports
    fi
}

function initial_setup {
    if [[ $(is_completed $FUNCNAME) == "1" ]]; then
        return
    fi

    apt-get -yq remove --purge apache*
    apt-get -yq dist-upgrade
    apt-get -yq install ca-certificates
    apt-get -yq install apt-utils
    apt-get -yq install cryptsetup libgfshare-bin obnam sshpass wget avahi-daemon
    apt-get -yq install avahi-utils avahi-discover connect-proxy openssh-server
    apt-get -yq install sudo git dialog build-essential avahi-daemon avahi-utils
    apt-get -yq install avahi-discover avahi-autoipd iptables dnsutils net-tools
    apt-get -yq install network-manager iputils-ping libnss-mdns libnss-myhostname
    apt-get -yq install libnss-gw-name nano man ntp locales locales-all debconf
    apt-get -yq install wireless-tools wpasupplicant usbutils cryptsetup zsh
    apt-get -yq install pinentry-curses eatmydata iotop bc grub2 hostapd haveged
    apt-get -yq install cpulimit

    if [ ! -d $INSTALL_DIR ]; then
        mkdir -p $INSTALL_DIR
    fi

    mark_completed $FUNCNAME
}

function admin_user_sudo {
    if ! grep -q "$MY_USERNAME  ALL=(ALL) ALL" $rootdir/etc/sudoers; then
        echo "$MY_USERNAME  ALL=(ALL) ALL" >> $rootdir/etc/sudoers
    fi
}

function search_for_attached_usb_drive {
    # If a USB drive is attached then search for email,
    # gpg, ssh keys and emacs configuration
    if [[ $(is_completed $FUNCNAME) == "1" ]]; then
        return
    fi
    detect_usb_drive
    if [ -b $USB_DRIVE ]; then
        if [ ! -d $USB_MOUNT ]; then
            echo $'Mounting USB drive'
            mkdir $USB_MOUNT
            mount $USB_DRIVE $USB_MOUNT
        fi
        if [ -d $USB_MOUNT/.gnupg ]; then
            echo $'Importing GPG keyring'
            cp -r $USB_MOUNT/.gnupg /home/$MY_USERNAME
            chown -R $MY_USERNAME:$MY_USERNAME /home/$MY_USERNAME/.gnupg
            GPG_KEYS_IMPORTED="yes"
            if [ ! -f /home/$MY_USERNAME/.gnupg/secring.gpg ]; then
                echo $'GPG files did not copy'
                exit 73529
            fi
        fi

        if [ -f $USB_MOUNT/private_key.gpg ]; then
            echo $'GPG private key found on USB drive'
            MY_GPG_PRIVATE_KEY=$USB_MOUNT/private_key.gpg
        fi
        if [ -f $USB_MOUNT/public_key.gpg ]; then
            echo $'GPG public key found on USB drive'
            MY_GPG_PUBLIC_KEY=$USB_MOUNT/public_key.gpg
        fi

        if [ -f $USB_MOUNT/letsencrypt ]; then
            echo $'Copying letsencrypt keys"'
            cp -r $USB_MOUNT/letsencrypt /etc
        fi

        if [ -d $USB_MOUNT/.ssh ]; then
            echo $'Importing ssh keys'
            cp -r $USB_MOUNT/.ssh /home/$MY_USERNAME
            chown -R $MY_USERNAME:$MY_USERNAME /home/$MY_USERNAME/.ssh
            # for security delete the ssh keys from the usb drive
            if [ ! -f /home/$MY_USERNAME/.ssh/id_rsa ]; then
                echo $'ssh files did not copy'
                exit 8
            fi
        fi
        if [ -f $USB_MOUNT/.emacs ]; then
            echo $'Importing .emacs file'
            cp -f $USB_MOUNT/.emacs /home/$MY_USERNAME/.emacs
            chown $MY_USERNAME:$MY_USERNAME /home/$MY_USERNAME/.emacs
        fi
        if [ -d $USB_MOUNT/.emacs.d ]; then
            echo $'Importing .emacs.d directory'
            cp -r $USB_MOUNT/.emacs.d /home/$MY_USERNAME
            chown -R $MY_USERNAME:$MY_USERNAME /home/$MY_USERNAME/.emacs.d
        fi
        if [ -d $USB_MOUNT/ssl ]; then
            echo $'Importing SSL certificates'
            cp -r $USB_MOUNT/ssl/* /etc/ssl
            chmod 640 /etc/ssl/certs/*
            chmod 400 /etc/ssl/private/*
            # change ownership of some certificates
            if [ -d /etc/prosody ]; then
                chown prosody:prosody /etc/ssl/private/xmpp.*
                chown prosody:prosody /etc/ssl/certs/xmpp.*
            fi
            if [ -d /etc/dovecot ]; then
                chown root:dovecot /etc/ssl/certs/dovecot.*
                chown root:dovecot /etc/ssl/private/dovecot.*
            fi
            if [ -f /etc/ssl/private/exim.key ]; then
                cp /etc/ssl/private/exim.key /etc/exim4
                cp /etc/ssl/certs/exim.crt /etc/exim4
                cp /etc/ssl/certs/exim.dhparam /etc/exim4
                chown root:Debian-exim /etc/exim4/exim.key /etc/exim4/exim.crt /etc/exim4/exim.dhparam
                chmod 640 /etc/exim4/exim.key /etc/exim4/exim.crt /etc/exim4/exim.dhparam
            fi
        fi
        if [ -d $USB_MOUNT/personal ]; then
            echo $'Importing personal directory'
            cp -r $USB_MOUNT/personal /home/$MY_USERNAME
            chown -R $MY_USERNAME:$MY_USERNAME /home/$MY_USERNAME/personal
        fi
    else
        if [ -d $USB_MOUNT ]; then
            umount $USB_MOUNT
            rm -rf $USB_MOUNT
        fi
        echo $'No USB drive attached'
    fi
    mark_completed $FUNCNAME
}

function mark_admin_user_account {
    set_completion_param "Admin user" "$MY_USERNAME"
}

function remove_instructions_from_motd {
    sed -i '/## /d' /etc/motd
}

function remove_default_user {
    # make sure you don't use the default user account
    if [[ $MY_USERNAME == "debian" ]]; then
        echo 'Do not use the default debian user account. Create a different user with: adduser [username]'
        exit 68
    fi
    # remove the default debian user to prevent it from becoming an attack vector
    if [ -d /home/debian ]; then
        userdel -r debian
        echo 'Default debian user account removed'
    fi
}

function create_completion_file {
    if [ ! -f $COMPLETION_FILE ]; then
        touch $COMPLETION_FILE
    fi
}

function upgrade_installation {
    # TODO
    echo ''
}

function setup_firewall {
    function_check create_completion_file
    create_completion_file

    function_check configure_firewall
    configure_firewall

    function_check configure_firewall_ping
    configure_firewall_ping

    function_check configure_firewall_for_dns
    configure_firewall_for_dns

    function_check configure_firewall_for_avahi
    configure_firewall_for_avahi

    function_check global_rate_limit
    global_rate_limit
}

function setup_utils {
    read_config_param "PROJECT_REPO"
    write_config_param "PROJECT_REPO" "$PROJECT_REPO"

    function_check install_backports_kernel
    install_backports_kernel

    function_check create_completion_file
    create_completion_file

    function_check read_configuration
    read_configuration

    function_check check_system_type
    check_system_type

    function_check upgrade_installation
    upgrade_installation

    function_check set_default_onion_domains
    set_default_onion_domains

    function_check locale_setup
    locale_setup

    function_check parse_args
    parse_args

    function_check check_domains
    check_domains

    function_check install_static_network
    install_static_network

    function_check remove_default_user
    remove_default_user

    function_check setup_firewall
    setup_firewall

    function_check create_repo_sources
    create_repo_sources

    function_check configure_dns
    configure_dns

    function_check initial_setup
    initial_setup

    function_check install_tor
    install_tor

    #function_check resolve_dns_via_tor
    #resolve_dns_via_tor

    function_check install_command_line_browser
    install_command_line_browser

    function_check enable_ssh_via_onion
    enable_ssh_via_onion

    function_check check_date
    check_date

    function_check install_dynamicdns
    install_dynamicdns

    function_check randomize_cron
    randomize_cron

    function_check create_freedns_updater
    create_freedns_updater

    function_check mark_admin_user_account
    mark_admin_user_account

    function_check enforce_good_passwords
    enforce_good_passwords

    function_check change_login_message
    change_login_message

    function_check enable_zram
    enable_zram

    function_check random_number_generator
    random_number_generator

    function_check set_your_domain_name
    set_your_domain_name

    function_check configure_internet_protocol
    configure_internet_protocol

    function_check create_git_project
    create_git_project

    function_check setup_wifi
    setup_wifi

    function_check configure_ssh
    configure_ssh

    function_check configure_ssh_onion
    configure_ssh_onion

    function_check allow_ssh_to_onion_address
    allow_ssh_to_onion_address

    function_check remove_instructions_from_motd
    remove_instructions_from_motd

    function_check check_hwrng
    check_hwrng

    function_check search_for_attached_usb_drive
    search_for_attached_usb_drive

    function_check regenerate_ssh_keys
    regenerate_ssh_keys

    function_check create_mirrors
    create_mirrors

    function_check create_upgrade_script
    create_upgrade_script

    function_check letsencrypt_renewals
    letsencrypt_renewals

    function_check install_watchdog_script
    install_watchdog_script

    function_check install_avahi
    install_avahi

    function_check create_avahi_onion_domains
    create_avahi_onion_domains

    #function_check install_atheros_wifi
    #install_atheros_wifi

    function_check route_outgoing_traffic_through_tor
    route_outgoing_traffic_through_tor

    function_check upgrade_golang
    upgrade_golang

    function_check install_tomb
    install_tomb

    function_check admin_user_sudo
    admin_user_sudo
}

function setup_email {
    function_check create_completion_file
    create_completion_file

    function_check install_email
    install_email

    function_check create_procmail
    create_procmail

    function_check handle_admin_emails
    handle_admin_emails

    function_check spam_filtering
    spam_filtering

    function_check configure_imap
    configure_imap

    #function_check configure_imap_client_certs
    #configure_imap_client_certs

    function_check configure_gpg
    configure_gpg

    function_check refresh_gpg_keys
    refresh_gpg_keys

    function_check configure_backup_key
    configure_backup_key

    function_check install_monkeysphere
    install_monkeysphere

    function_check encrypt_incoming_email
    encrypt_incoming_email

    function_check encrypt_outgoing_email
    encrypt_outgoing_email

    function_check email_client
    email_client

    function_check email_archiving
    email_archiving

    function_check email_from_address
    email_from_address

    function_check create_public_mailing_list
    create_public_mailing_list

    #function check create_private_mailing_list
    #create_private_mailing_list

    function_check encrypt_all_email
    encrypt_all_email

    function_check import_email
    import_email
}

function setup_web {
    function_check create_completion_file
    create_completion_file

    function_check install_web_server
    install_web_server

    function_check install_web_server_access_control
    install_web_server_access_control
}

function upgrade_apps {
    function_check create_completion_file
    create_completion_file

    APPS_COMPLETED=()
    FILES=/usr/share/${PROJECT_NAME}/apps/${PROJECT_NAME}-app-*

    # for all the app scripts
    for filename in $FILES
    do
        app_name=$(echo "${filename}" | awk -F '-app-' '{print $2}')

        item_in_array "${app_name}" "${APPS_COMPLETED[@]}"
        if [[ $? != 0 ]]; then
            function_check app_is_installed
            if [[ "$(app_is_installed $a)" == "1" ]]; then
                app_load_variables ${app_name}
                APPS_COMPLETED+=("${app_name}")
                function_check upgrade_${app_name}
                upgrade_${app_name}
            fi
        fi
    done
}

function setup_apps {
    is_interactive=$1

    function_check create_completion_file
    create_completion_file

    function_check detect_installable_apps
    detect_installable_apps

    function_check choose_apps_for_variant
    choose_apps_for_variant "$SYSTEM_TYPE"

    echo $"System variant: $SYSTEM_TYPE"
    echo $'The following apps have been selected'
    echo ''
    function_check list_chosen_apps
    list_chosen_apps
    echo ''

    function_check upgrade_apps
    upgrade_apps

    if [[ $is_interactive == "menuconfig"* ]]; then
        ${PROJECT_NAME}-addremove add-all
        if [ ! "$?" = "0" ]; then
            exit 72524
        fi
    fi

    if [[ $is_interactive == "noninteractive" || $is_interactive == "headless" ]]; then
        function_check install_apps
        install_apps
        if [ ! $APP_INSTALLED_SUCCESS ]; then
            echo $'One or more apps failed to install'
        fi
    fi
}

function combine_all_scripts {
    combined_filename=$1

    # initial variables
    cp $PROJECT_INSTALL_DIR/${PROJECT_NAME}-vars $combined_filename

    # utilities
    UTILS_FILES=/usr/share/${PROJECT_NAME}/utils/${PROJECT_NAME}-utils-*
    for f in $UTILS_FILES
    do
        # this removes the first line, which is #!/bin/bash
        tail -n +2 "$f" >> $combined_filename
    done

    # base system
    BASE_SYSTEM_FILES=/usr/share/${PROJECT_NAME}/base/${PROJECT_NAME}-base-*
    for f in $BASE_SYSTEM_FILES
    do
        tail -n +2 "$f" >> $combined_filename
    done

    # apps
    APP_FILES=/usr/share/${PROJECT_NAME}/apps/${PROJECT_NAME}-app-*
    for f in $APP_FILES
    do
        tail -n +2 "$f" >> $combined_filename
    done
}

# NOTE: deliberately no exit 0
