#!/usr/bin/env bash

## - Configuration file for firewall script IPv4
## -    ipt-firewall-gateway
## -    ipt-firewall-flush
## -

#######################################################################
# -------------------------- Configuration -------------------------- #

# -------------
# --- Define programs
# -------------

ip6t="/sbin/ip6tables"
l2ban_client="$(which fail2ban-client)"


# -------------
# --- Logging
# -------------

log_all=false

log_syn_flood=false
log_fragments=false
log_new_not_sync=false
log_invalid_state=false
log_invalid_flags=false
log_spoofed=false
log_spoofed_out=false
log_to_lo=false
log_not_wanted=false
log_blocked=false
log_unprotected=false
log_prohibited=false
log_voip=false
log_rejected=true

log_ssh=false

# - Log using the specified syslog level. 7 (debug) is a good choice 
# - unless you specifically need something else. 
# -
log_level=debug

# - logging messages
# -
log_prefix="IPv6:"


# -------------
# --- Network Interfaces
# -------------

# External interface
#
# Notice:
#    Depending on your virtualization software, hosts network-interface
#    may be different from guests one.
#
#    In case of using LXC and a typical network setup with linux bridge br0:
#       guest_if="br0"
#       host_if="br0"
#       blocked_ifs="eth0"
#
#    NOTE: if using LX-Container with macvlan bridge, you CANNOT firewall
#          guests here !!
#       guest_if=""
#       host_if="macvlan0"
#       blocked_ifs="eth0"
#
#    In case of using Linux-VServer both interfaces are the same:
#       guest_if="eth0"
#       host_if="eth0"
#       blocked_ifs=""
#    
guest_if=""
host_if=""

## is this a virtuel system ?
host_is_vm=false

# - Extern Interfaces Static Lines
# -    (comma separated list)
#ext_if_static="eth0"

# - VPN Interfaces
# -    (comma separated list)
vpn_ifs=""
   
# - Local Interfaces
local_if_1=""
local_if_2=""
local_if_3=""

local_ifs="$local_if_1 $local_if_2 $local_if_3"


# -------------
# --- Interfaces completly blocked
# -------------

# - Interfaces to block (note: they will all be blocked)
# -
# - Example: eth1 is used for DSL Line, that becomes an extra 
# - interface (maybe ppp0). A further use of eth1 (which would 
# - be possible) is not configured at time, so you can block it.
# -   blocked_ifs="eth1"
# -
blocked_ifs=""


# -------------
# --- Interfaces not firewalled
# -------------

# - Note:
# - Can be (for example) an interface, whose (complete) traffic is 
# - protected by a firewall on an other system in the local area 
# -
unprotected_ifs=""


# -------------
# ---- Allow Forwarding (private) IPs / IP-Ranges
# -------------

# - Maybe useful in case of virtual hosts with private addresses or
# - if using a vpn network to forward into private areas.
# -
# - Note: this rules takes affect before rules to protect against
# -       unwanted packages e.g. blocking private addresses on
# -       externel interfaces.
# -       
# - Note: you can specify networks using CIDR notation
# -       like "192.168.2.0/24"
# -
forward_private_ips=""


# -------------
# --- Services local Mashine
# -------------

# - Is this a DHCP Server ?
local_dhcp_service=false

# - Is this a DNS Server ?
local_dns_service=false

# - Is this a Web Server ?
local_http_service=false
http_ports="80,443"

# - Is this a SMTP Server
local_smtp_service=false

# - Is this a Mailserver (POP/IMAP)
local_mail_service=false
mail_user_ports="587,465,110,995,143,993"

# - SSH Service
local_ssh_service=true
# - comma separated list
ssh_ports="22"

# - VPN Service
local_vpn_service=false
local_vpn_ports="1194 1195"

# - FTP Server
# -
local_ftp_service=false

# - Mumble Server
# -
local_mumble_service=false
mumble_ports="64738"

# - Is this a TFTP Server (Port udp 69)
# -
# - NOT YET IMPLEMENTED
# -
local_tftp_service=false

# - XyMon Service (usually TCP port 1984)
# -
# - NOT YET IMPLEMENTED
# -
local_xymon_service=false
xymon_port=1984

# - Munin Server (usually TCP port 4949)
# -
local_munin_service=false
munin_remote_port="4949"


# -------------
# --- Services local Network
# -------------

# host root ip
host_ips="/128"


# guests ip's
# NOT IN USE
guest_1_ips=""
# NOT IN USE
guest_2_ips=""
# NOT IN USE
guest_3_ips=""
# NOT IN USE
guest_4_ips=""
# NOT IN USE
guest_5_ips=""
# NOT IN USE
guest_6_ips=""

guest_ips="$guest_1_ips $guest_2_ips $guest_3_ips $guest_4_ips $guest_5_ips $guest_6_ips"
lxc_ips="$guest_ips"
vserver_ips=""


# -------------
# - Protocols Out
# -------------

# - Rsync Protocol
# -
# - Needed for some integrated provider of clamav-unofficial-sigs
# -
local_rsync_out=false
rsync_out_ips=""
rsync_ports="873"


# -------------
# ---- Restrict local Servive to given (extern) IP-Address/Network
# -------------

# - restrict_local_service_to_net
# - 
# - restrict_local_service_to_net="ext-netr,local-address,port,protocol"
# -
# - Note:
# - =====
# -    - Only 'tcp' and 'udp' are allowed valuse for protocol.
# -    - Traffic recieved on natted interfaces will be ommitted!
# -
# - Use this parameter to (only) give some extern netwoks access to special local 
# - services.
# -
# - Example:
# -    allow access from 2003:45:4612:3a00::/56 to tcp service at 2a01:30:0:13:211:84ff:feb7:7f9c on port 1036
# -    allow access from 2a01:30:1fff:fd00:: to https service at 2a01:30:0:13:211:84ff:feb7:7f9c
# -
# -    restrict_local_service_to_net="2003:45:4612:3a00::/56,2a01:30:0:13:211:84ff:feb7:7f9c,1036,tcp 
# -                                   2a01:30:1fff:fd00::/64,2a01:30:0:13:211:84ff:feb7:7f9c,443,tcp"
# -
# - Blank separated list
# -
restrict_local_service_to_net=""


# -------------
# ---- Restrict local Network to given extern IP-Address/Network
# -------------

# - restrict_local_net_to_net
# -
# -    restrict_local_net_to_net="<src-ext-net>,<dst-local-net> [<src-ext-net>,<dst-local-net>] [..]"
# -
# - All traffic from the given first network to the given second network is allowed
# -
# - Note:
# - =====
# -    - Traffic recieved on natted interfaces will be ommitted!
# -    - If you want allow both directions, you have to make two entries - one for evry directions.
# -
# - Example:
# -   allow_ext_net_to_local_net="2003:45:4612:3a00::/56,2a01:30:0:13:211:84ff:feb7:7f9c/128
# -                               2a01:30:1fff:fd00::/64,2a01:30:0:13:211:84ff:feb7:7f9c/128"
# - 
# - Blank separated list
# -
restrict_local_net_to_net=""

# - Remote Munin Server
# -
munin_remote_ip="2a01:30:0:13:2b3:bdff:fe13:cbf4"
munin_local_port="4949"


# - DNS Server 
dns_server_ips=""

# - SSH Server
# -
ssh_server_ips=""

# - HTTP(S) Server
# -
http_server_ips=""

# - Mail SMTP Server 
# -
smtpd_ips=""

# - Mail Services (smtps/pop(s)/imap(s)
# -
mail_server_ips=""

# - Mail Client (smtps/pop(s)/imap(s)
# -
mail_client_ips=""

# - FTP Server
# -
ftp_server_ips=""

# - Mumble Server
# -
mumble_server_ips=""

# - TFTP Server
tftp_server_ips=""

# - Munin Server
# -
munin_server_ips=""

# - XyMon Server
xymon_server_ips=""
local_xymon_client=false


# -------------
# --- Allow special Ports (OUT)
# -------------

# - TCP Ports
# -
tcp_out_ports=""

# - UDP Ports
# -
udp_out_ports=""


# -------------
# --- Block IP's / IP-Ranges
# -------------

blocked_ips=""


# -------------
# --- Block Ports
# -------------

# - Generally (for all interfaces) block this ports
# -
# - Portmapper
# - tcp 111
# - udp 111
# -
# - Authentication tap ident
# - tcp 113
# -
# - Location Service
# - tcp 135
# -
# - Windows Stuff
# - tcp 137:139
# - udp 137:139
# - tcp 445
# -
block_tcp_ports="111 113 135 137:139 445"
block_udp_ports="111 137:139"


# -------------
# - Some special stuff
# -------------

create_traffic_counter=true
create_iperf_rules=true


# -------------
# --- Kernel related - Adjust Kernel Parameters (Security/Tuning)
# -------------

# - Disable ip forwarding between interfaces
# -
kernel_forward_between_interfaces=false

# - Deactivate Source Routed Packets
# -
kernel_deactivate_source_route=true

# - Deactivate sending ICMP redirects
# -
# - ICMP redirects are used by routers to specify better routing paths out of 
# - one network, based on the host choice, so basically it affects the way 
# - packets are routed and destinations. 
# -
kernel_dont_accept_redirects=true


# -------------
# --- Some further Ports/IP-Address Configuration
# -------------

# - unpriviligierte Ports
# -
unprivports="1024:65535"

# unique local address (ULA) - private address block
ula_block="fc00::/7"

# - Loopback
loopback="::1/128"


# ----------------------- End: Configuration ----------------------- #
######################################################################


## ====================================
## - Don't make changes after this Line
## ====================================



# -----------
# --- Define Arrays
# -----------


# ---
# - IP-Addresses (Host, Guests (VServer, LX_Container)
# ---
declare -a host_ips_arr
for _ip in $host_ips ; do
   host_ips_arr+=("$_ip")
done
declare -a guest_ips_arr
for _ip in $guest_ips ; do
   guest_ips_arr+=("$_ip")
done
declare -a lxc_ips_arr
for _ip in $lxc_ips ; do
   lxc_ips_arr+=("$_ip")
done
declare -a vserver_ips_arr
for _ip in $vserver_ips ; do
   vserver_ips_arr+=("$_ip")
done

# ---
# - Extern Interfaces
# ---
declare -a ext_if_arr
ext_if_arr+=("$host_if")
if [[ $host_if != $guest_if ]]; then
   ext_if_arr+=("$guest_if")
fi

# ---
# - VPN Interfaces
# ---
declare -a vpn_if_arr
for _dev in $vpn_ifs ; do
   vpn_if_arr+=("$_dev")
done

# ---
# - Local Network Interfaces
# ---
declare -a local_if_arr
for _dev in $local_ifs ; do
   local_if_arr+=("$_dev")
done

# ---
# - Network Interfaces completly blocked
# ---
declare -a blocked_if_arr
for _dev in $blocked_ifs ; do
   blocked_if_arr+=("$_dev")
done

# ---
# - Network Interfaces not firewalled
# ---
declare -a unprotected_if_arr
for _dev in $unprotected_ifs ; do
   unprotected_if_arr+=("$_dev")
done

# ---
# - Restrict local Servive to given IP-Address/Network
# ---
declare -a restrict_local_service_to_net_arr
for _val in $restrict_local_service_to_net ; do
   restrict_local_service_to_net_arr+=("$_val")
done

# ---
# - Restrict local Network to given IP-Address/Network
# ---
declare -a restrict_local_net_to_net_arr
for _val in $restrict_local_net_to_net ; do
   restrict_local_net_to_net_arr+=("$_val")
done

# ---
# - Generally block ports
# ---
declare -a block_tcp_port_arr
for _port in $block_tcp_ports ; do
   block_tcp_port_arr+=("$_port")
done

declare -a block_udp_port_arr
for _port in $block_udp_ports ; do
   block_udp_port_arr+=("$_port")
done

# ---
# - Private IPs / IP-Ranges allowed to forward
# ---
declare -a forward_private_ip_arr
for _ip in $forward_private_ips ; do
   forward_private_ip_arr+=("$_ip")
done

# ---
# - IP Addresses DNS Server
# ---
declare -a dns_server_ip_arr
for _ip in $dns_server_ips ; do
   dns_server_ip_arr+=("$_ip")
done

# ---
# - IP Addresses SSH Server
# ---
declare -a ssh_server_ip_arr
for _ip in $ssh_server_ips ; do
   ssh_server_ip_arr+=("$_ip")
done

# ---
# - IP Addresses HTTP Server
# ---
declare -a http_server_ip_arr
for _ip in $http_server_ips ; do
   http_server_ip_arr+=("$_ip")
done

# ---
# - IP Addresses FTP Server
# ---
declare -a ftp_server_ip_arr
for _ip in $ftp_server_ips ; do
   ftp_server_ip_arr+=("$_ip")
done

# ---
# - Mail SMTP Server
# ---
declare -a smtpd_ips_arr
for _ip in $smtpd_ips ; do
   smtpd_ips_arr+=("$_ip")
done

# ---
# - Mail Services (smtps/pop(s)/imap(s)
# ---
declare -a mail_server_ips_arr
for _ip in $mail_server_ips ; do
   mail_server_ips_arr+=("$_ip")
done

# ---
# - Mail client (smtps/pop(s)/imap(s)
# ---
# local
declare -a mail_client_ips_arr
for _ip in $mail_client_ips ; do
   mail_client_ips_arr+=("$_ip")
done

# ---
# - IP Addresses Mumble Server
# ---
declare -a mumble_server_ip_arr
for _ip in $mumble_server_ips ; do
   mumble_server_ip_arr+=("$_ip")
done

# ---
# - IP Addresses Telephone Systems
# ---
declare -a tel_sys_ip_arr
for _ip in $tel_sys_ips ; do
   tel_sys_ip_arr+=("$_ip")
done

# ---
# - IP Addresses Munin
# ---
declare -a munin_server_ip_arr
for _ip in $munin_server_ips ; do
   munin_server_ip_arr+=("$_ip")
done

# ---
# - IP Addresses XyMon
# ---
declare -a xymon_server_ip_arr
for _ip in $xymon_server_ips ; do
   xymon_server_ip_arr+=("$_ip")
done

# ---
# - IP Addresses Rsync Out
# ---
declare -a rsync_out_ip_arr
for _ip in $rsync_out_ips ; do
   rsync_out_ip_arr+=("$_ip")
done


# ---
# - local SSH Ports
# ---
declare -a ssh_port_arr
for _port in $ssh_ports ; do
   ssh_port_arr+=("$_port")
done

# ---
# - local VPN Ports
# ---
declare -a udp_local_vpn_port_arr
for _port in $local_vpn_ports ; do
   local_vpn_port_arr+=("$_port")
done

# ---
# - Rsync Out
# --
declare -a rsync_port_arr
for _port in $rsync_ports ; do
   rsync_port_arr+=("$_port")
done

# ---
# - Special TCP Ports OUT
# ---
declare -a tcp_out_port_arr
for _port in $tcp_out_ports ; do
   tcp_out_port_arr+=("$_port")
done

# ---
# - Special UDP Ports OUT
# ---
declare -a udp_out_port_arr
for _port in $udp_out_ports ; do
   udp_out_port_arr+=("$_port")
done


# -------------
# --- Some functions
# -------------
echononl(){
   echo X\\c > /tmp/shprompt$$
   if [ `wc -c /tmp/shprompt$$ | awk '{print $1}'` -eq 1 ]; then
      echo -e -n "$*\\c" 1>&2
   else
       echo -e -n "$*" 1>&2
   fi
   rm /tmp/shprompt$$
}
echo_done() {
   echo -e "\033[75G[ \033[32mdone\033[m ]"
}
echo_ok() {
   echo -e "\033[75G[ \033[32mok\033[m ]"
}
echo_warning() {
   echo -e "\033[75G[ \033[33m\033[1mwarn\033[m ]"
}
echo_failed(){
   echo -e "\033[75G[ \033[1;31mfailed\033[m ]"
}
echo_skipped() {
   echo -e "\033[75G[ \033[33m\033[1mskipped\033[m ]"
}

## - Check if a given array (parameter 2) contains a given string (parameter 1)
## -
containsElement () {
   local e
   for e in "${@:2}"; do [[ "$e" == "$1" ]] && return 0; done
   return 1
}