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DDoS Protection Script For iptables

Discussion in 'Security' started by abuzant, Sep 18, 2008.

  1. #1
    Hello,

    After a few days of being attacked by a 25,000 zombie botnet, believe me i have tried almost everything possible to make it stop. The best thing that helped was this script, thought it could help here when it's your turn getting those script-kiddies attackers visiting your servers.

    
    #!/bin/sh
    #------------------------------------------------------------------------------
    #
    # File: SIG-antiDDoS.sh
    #
    # Compiler: Ruslan Abuzant <ruslan@abuzant.com>
    #           PS> Collected From Lots Of Sources
    #           PS> Credits: Real Authors (no idea)
    #
    # URL: http://www.liteforex.org/
    #
    # License: GNU GPL (version 2, or any later version).
    #
    # Configuration.
    #------------------------------------------------------------------------------
    
    # For debugging use iptables -v.
    IPTABLES="/sbin/iptables"
    IP6TABLES="/sbin/ip6tables"
    MODPROBE="/sbin/modprobe"
    RMMOD="/sbin/rmmod"
    ARP="/usr/sbin/arp"
    
    
    # Logging options.
    #------------------------------------------------------------------------------
    LOG="LOG --log-level debug --log-tcp-sequence --log-tcp-options"
    LOG="$LOG --log-ip-options"
    
    
    # Defaults for rate limiting
    #------------------------------------------------------------------------------
    RLIMIT="-m limit --limit 3/s --limit-burst 8"
    
    
    # Unprivileged ports.
    #------------------------------------------------------------------------------
    PHIGH="1024:65535"
    PSSH="1000:1023"
    
    
    # Load required kernel modules
    #------------------------------------------------------------------------------
    $MODPROBE ip_conntrack_ftp
    $MODPROBE ip_conntrack_irc
    
    
    # Mitigate ARP spoofing/poisoning and similar attacks.
    #------------------------------------------------------------------------------
    # Hardcode static ARP cache entries here
    # $ARP -s IP-ADDRESS MAC-ADDRESS
    
    
    # Kernel configuration.
    #------------------------------------------------------------------------------
    
    # Disable IP forwarding.
    # On => Off = (reset)
    echo 1 > /proc/sys/net/ipv4/ip_forward
    echo 0 > /proc/sys/net/ipv4/ip_forward
    
    # Enable IP spoofing protection
    for i in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 1 > $i; done
    
    # Protect against SYN flood attacks
    echo 1 > /proc/sys/net/ipv4/tcp_syncookies
    
    # Ignore all incoming ICMP echo requests
    echo 0 > /proc/sys/net/ipv4/icmp_echo_ignore_all
    
    # Ignore ICMP echo requests to broadcast
    echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
    
    # Log packets with impossible addresses.
    for i in /proc/sys/net/ipv4/conf/*/log_martians; do echo 1 > $i; done
    
    # Don't log invalid responses to broadcast
    echo 1 > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses
    
    # Don't accept or send ICMP redirects.
    for i in /proc/sys/net/ipv4/conf/*/accept_redirects; do echo 0 > $i; done
    for i in /proc/sys/net/ipv4/conf/*/send_redirects; do echo 0 > $i; done
    
    # Don't accept source routed packets.
    for i in /proc/sys/net/ipv4/conf/*/accept_source_route; do echo 0 > $i; done
    
    # Disable multicast routing
    for i in /proc/sys/net/ipv4/conf/*/mc_forwarding; do echo 0 > $i; done
    
    # Disable proxy_arp.
    for i in /proc/sys/net/ipv4/conf/*/proxy_arp; do echo 0 > $i; done
    
    # Enable secure redirects, i.e. only accept ICMP redirects for gateways
    # Helps against MITM attacks.
    for i in /proc/sys/net/ipv4/conf/*/secure_redirects; do echo 1 > $i; done
    
    # Disable bootp_relay
    for i in /proc/sys/net/ipv4/conf/*/bootp_relay; do echo 0 > $i; done
    
    # Default policies.
    #------------------------------------------------------------------------------
    
    # Drop everything by default.
    $IPTABLES -P INPUT DROP
    $IPTABLES -P FORWARD DROP
    $IPTABLES -P OUTPUT DROP
    
    # Set the nat/mangle/raw tables' chains to ACCEPT
    $IPTABLES -t nat -P PREROUTING ACCEPT
    $IPTABLES -t nat -P OUTPUT ACCEPT
    $IPTABLES -t nat -P POSTROUTING ACCEPT
    
    $IPTABLES -t mangle -P PREROUTING ACCEPT
    $IPTABLES -t mangle -P INPUT ACCEPT
    $IPTABLES -t mangle -P FORWARD ACCEPT
    $IPTABLES -t mangle -P OUTPUT ACCEPT
    $IPTABLES -t mangle -P POSTROUTING ACCEPT
    
    # Cleanup.
    #------------------------------------------------------------------------------
    
    # Delete all
    $IPTABLES -F
    $IPTABLES -t nat -F
    $IPTABLES -t mangle -F
    
    # Delete all
    $IPTABLES -X
    $IPTABLES -t nat -X
    $IPTABLES -t mangle -X
    
    # Zero all packets and counters.
    $IPTABLES -Z
    $IPTABLES -t nat -Z
    $IPTABLES -t mangle -Z
    
    # Completely disable IPv6.
    #------------------------------------------------------------------------------
    
    # Block all IPv6 traffic
    # If the ip6tables command is available, try to block all IPv6 traffic.
    if test -x $IP6TABLES; then
    # Set the default policies
    # drop everything
    $IP6TABLES -P INPUT DROP 2>/dev/null
    $IP6TABLES -P FORWARD DROP 2>/dev/null
    $IP6TABLES -P OUTPUT DROP 2>/dev/null
    
    # The mangle table can pass everything
    $IP6TABLES -t mangle -P PREROUTING ACCEPT 2>/dev/null
    $IP6TABLES -t mangle -P INPUT ACCEPT 2>/dev/null
    $IP6TABLES -t mangle -P FORWARD ACCEPT 2>/dev/null
    $IP6TABLES -t mangle -P OUTPUT ACCEPT 2>/dev/null
    $IP6TABLES -t mangle -P POSTROUTING ACCEPT 2>/dev/null
    
    # Delete all rules.
    $IP6TABLES -F 2>/dev/null
    $IP6TABLES -t mangle -F 2>/dev/null
    
    # Delete all chains.
    $IP6TABLES -X 2>/dev/null
    $IP6TABLES -t mangle -X 2>/dev/null
    
    # Zero all packets and counters.
    $IP6TABLES -Z 2>/dev/null
    $IP6TABLES -t mangle -Z 2>/dev/null
    fi
    
    # Custom user-defined chains.
    #------------------------------------------------------------------------------
    
    # LOG packets, then ACCEPT.
    $IPTABLES -N ACCEPTLOG
    $IPTABLES -A ACCEPTLOG -j $LOG $RLIMIT --log-prefix "ACCEPT "
    $IPTABLES -A ACCEPTLOG -j ACCEPT
    
    # LOG packets, then DROP.
    $IPTABLES -N DROPLOG
    $IPTABLES -A DROPLOG -j $LOG $RLIMIT --log-prefix "DROP "
    $IPTABLES -A DROPLOG -j DROP
    
    # LOG packets, then REJECT.
    # TCP packets are rejected with a TCP reset.
    $IPTABLES -N REJECTLOG
    $IPTABLES -A REJECTLOG -j $LOG $RLIMIT --log-prefix "REJECT "
    $IPTABLES -A REJECTLOG -p tcp -j REJECT --reject-with tcp-reset
    $IPTABLES -A REJECTLOG -j REJECT
    
    # Only allows RELATED ICMP types
    # (destination-unreachable, time-exceeded, and parameter-problem).
    # TODO: Rate-limit this traffic?
    # TODO: Allow fragmentation-needed?
    # TODO: Test.
    $IPTABLES -N RELATED_ICMP
    $IPTABLES -A RELATED_ICMP -p icmp --icmp-type destination-unreachable -j ACCEPT
    $IPTABLES -A RELATED_ICMP -p icmp --icmp-type time-exceeded -j ACCEPT
    $IPTABLES -A RELATED_ICMP -p icmp --icmp-type parameter-problem -j ACCEPT
    $IPTABLES -A RELATED_ICMP -j DROPLOG
    
    # Make It Even Harder To Multi-PING
    $IPTABLES  -A INPUT -p icmp -m limit --limit 1/s --limit-burst 2 -j ACCEPT
    $IPTABLES  -A INPUT -p icmp -m limit --limit 1/s --limit-burst 2 -j LOG --log-prefix PING-DROP:
    $IPTABLES  -A INPUT -p icmp -j DROP
    $IPTABLES  -A OUTPUT -p icmp -j ACCEPT
    
    # Only allow the minimally required/recommended parts of ICMP. Block the rest.
    #------------------------------------------------------------------------------
    
    # TODO: This section needs a lot of testing!
    
    # First, drop all fragmented ICMP packets (almost always malicious).
    $IPTABLES -A INPUT -p icmp --fragment -j DROPLOG
    $IPTABLES -A OUTPUT -p icmp --fragment -j DROPLOG
    $IPTABLES -A FORWARD -p icmp --fragment -j DROPLOG
    
    # Allow all ESTABLISHED ICMP traffic.
    $IPTABLES -A INPUT -p icmp -m state --state ESTABLISHED -j ACCEPT $RLIMIT
    $IPTABLES -A OUTPUT -p icmp -m state --state ESTABLISHED -j ACCEPT $RLIMIT
    
    # Allow some parts of the RELATED ICMP traffic, block the rest.
    $IPTABLES -A INPUT -p icmp -m state --state RELATED -j RELATED_ICMP $RLIMIT
    $IPTABLES -A OUTPUT -p icmp -m state --state RELATED -j RELATED_ICMP $RLIMIT
    
    # Allow incoming ICMP echo requests (ping), but only rate-limited.
    $IPTABLES -A INPUT -p icmp --icmp-type echo-request -j ACCEPT $RLIMIT
    
    # Allow outgoing ICMP echo requests (ping), but only rate-limited.
    $IPTABLES -A OUTPUT -p icmp --icmp-type echo-request -j ACCEPT $RLIMIT
    
    # Drop any other ICMP traffic.
    $IPTABLES -A INPUT -p icmp -j DROPLOG
    $IPTABLES -A OUTPUT -p icmp -j DROPLOG
    $IPTABLES -A FORWARD -p icmp -j DROPLOG
    
    # Selectively allow certain special types of traffic.
    #------------------------------------------------------------------------------
    
    # Allow loopback interface to do anything.
    $IPTABLES -A INPUT -i lo -j ACCEPT
    $IPTABLES -A OUTPUT -o lo -j ACCEPT
    
    # Allow incoming connections related to existing allowed connections.
    $IPTABLES -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
    
    # Allow outgoing connections EXCEPT invalid
    $IPTABLES -A OUTPUT -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
    
    # Miscellaneous.
    #------------------------------------------------------------------------------
    
    # We don't care about Milkosoft, Drop SMB/CIFS/etc..
    $IPTABLES -A INPUT -p tcp -m multiport --dports 135,137,138,139,445,1433,1434 -j DROP
    $IPTABLES -A INPUT -p udp -m multiport --dports 135,137,138,139,445,1433,1434 -j DROP
    
    # Explicitly drop invalid incoming traffic
    $IPTABLES -A INPUT -m state --state INVALID -j DROP
    
    # Drop invalid outgoing traffic, too.
    $IPTABLES -A OUTPUT -m state --state INVALID -j DROP
    
    # If we would use NAT, INVALID packets would pass - BLOCK them anyways
    $IPTABLES -A FORWARD -m state --state INVALID -j DROP
    
    # PORT Scanners (stealth also)
    $IPTABLES -A INPUT -m state --state NEW -p tcp --tcp-flags ALL ALL -j DROP
    $IPTABLES -A INPUT -m state --state NEW -p tcp --tcp-flags ALL NONE -j DROP
    
    # TODO: Some more anti-spoofing rules? For example:
    # $IPTABLES -A INPUT -p tcp --tcp-flags ALL FIN,URG,PSH -j DROP
    # $IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
    # $IPTABLES -A INPUT -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP
    $IPTABLES -N SYN_FLOOD
    $IPTABLES -A INPUT -p tcp --syn -j SYN_FLOOD
    $IPTABLES -A SYN_FLOOD -m limit --limit 2/s --limit-burst 6 -j RETURN
    $IPTABLES -A SYN_FLOOD -j DROP
    
    # TODO: Block known-bad IPs (see http://www.dshield.org/top10.php).
    # $IPTABLES -A INPUT -s INSERT-BAD-IP-HERE -j DROPLOG
    
    # Drop any traffic from IANA-reserved IPs.
    #------------------------------------------------------------------------------
    
    $IPTABLES -A INPUT -s 0.0.0.0/7 -j DROP
    $IPTABLES -A INPUT -s 2.0.0.0/8 -j DROP
    $IPTABLES -A INPUT -s 5.0.0.0/8 -j DROP
    $IPTABLES -A INPUT -s 7.0.0.0/8 -j DROP
    $IPTABLES -A INPUT -s 10.0.0.0/8 -j DROP
    $IPTABLES -A INPUT -s 23.0.0.0/8 -j DROP
    $IPTABLES -A INPUT -s 27.0.0.0/8 -j DROP
    $IPTABLES -A INPUT -s 31.0.0.0/8 -j DROP
    $IPTABLES -A INPUT -s 36.0.0.0/7 -j DROP
    $IPTABLES -A INPUT -s 39.0.0.0/8 -j DROP
    $IPTABLES -A INPUT -s 42.0.0.0/8 -j DROP
    $IPTABLES -A INPUT -s 49.0.0.0/8 -j DROP
    $IPTABLES -A INPUT -s 50.0.0.0/8 -j DROP
    $IPTABLES -A INPUT -s 77.0.0.0/8 -j DROP
    $IPTABLES -A INPUT -s 78.0.0.0/7 -j DROP
    $IPTABLES -A INPUT -s 92.0.0.0/6 -j DROP
    $IPTABLES -A INPUT -s 96.0.0.0/4 -j DROP
    $IPTABLES -A INPUT -s 112.0.0.0/5 -j DROP
    $IPTABLES -A INPUT -s 120.0.0.0/8 -j DROP
    $IPTABLES -A INPUT -s 169.254.0.0/16 -j DROP
    $IPTABLES -A INPUT -s 172.16.0.0/12 -j DROP
    $IPTABLES -A INPUT -s 173.0.0.0/8 -j DROP
    $IPTABLES -A INPUT -s 174.0.0.0/7 -j DROP
    $IPTABLES -A INPUT -s 176.0.0.0/5 -j DROP
    $IPTABLES -A INPUT -s 184.0.0.0/6 -j DROP
    $IPTABLES -A INPUT -s 192.0.2.0/24 -j DROP
    $IPTABLES -A INPUT -s 197.0.0.0/8 -j DROP
    $IPTABLES -A INPUT -s 198.18.0.0/15 -j DROP
    $IPTABLES -A INPUT -s 223.0.0.0/8 -j DROP
    $IPTABLES -A INPUT -s 224.0.0.0/3 -j DROP
    
    # Selectively allow certain outbound connections, block the rest.
    #------------------------------------------------------------------------------
    
    # Allow outgoing DNS requests. Few things will work without this.
    $IPTABLES -A OUTPUT -m state --state NEW -p udp --dport 53 -j ACCEPT
    $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 53 -j ACCEPT
    
    # Allow outgoing HTTP requests. Unencrypted, use with care.
    $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 80 -j ACCEPT
    
    # Allow outgoing HTTPS requests.
    $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 443 -j ACCEPT
    
    # Allow outgoing SMTPS requests. Do NOT allow unencrypted SMTP!
    # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 465 -j ACCEPT
    
    # Allow outgoing "submission" (RFC 2476) requests.
    $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 587 -j ACCEPT
    
    # Allow outgoing POP3S requests.
    $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 995 -j ACCEPT
    
    # Allow outgoing SSH requests.
    $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 22 -j ACCEPT
    
    # Allow outgoing FTP requests. Unencrypted, use with care.
    $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 21 -j ACCEPT
    
    # Allow outgoing NNTP requests. Unencrypted, use with care.
    # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 119 -j ACCEPT
    
    # Allow outgoing NTP requests. Unencrypted, use with care.
    # $IPTABLES -A OUTPUT -m state --state NEW -p udp --dport 123 -j ACCEPT
    
    # Allow outgoing IRC requests. Unencrypted, use with care.
    # Note: This usually needs the ip_conntrack_irc kernel module.
    # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 6667 -j ACCEPT
    
    # Allow outgoing requests to various proxies. Unencrypted, use with care.
    # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 8080 -j ACCEPT
    # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 8090 -j ACCEPT
    
    # Allow outgoing DHCP requests. Unencrypted, use with care.
    # TODO: This is completely untested, I have no idea whether it works!
    # TODO: I think this can be tightened a bit more.
    $IPTABLES -A OUTPUT -m state --state NEW -p udp --sport 67:68 --dport 67:68 -j ACCEPT
    
    # Allow outgoing CVS requests. Unencrypted, use with care.
    # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 2401 -j ACCEPT
    
    # Allow outgoing MySQL requests. Unencrypted, use with care.
    # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 3306 -j ACCEPT
    
    # Allow outgoing SVN requests. Unencrypted, use with care.
    # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 3690 -j ACCEPT
    
    # Allow outgoing PLESK requests. Unencrypted, use with care.
    # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 8443 -j ACCEPT
    
    # Allow outgoing Tor (http://tor.eff.org) requests.
    # Note: Do _not_ use unencrypted protocols over Tor (sniffing is possible)!
    # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 9001 -j ACCEPT
    # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 9002 -j ACCEPT
    # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 9030 -j ACCEPT
    # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 9031 -j ACCEPT
    # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 9090 -j ACCEPT
    # $IPTABLES -A OUTPUT -m state --state NEW -p tcp --dport 9091 -j ACCEPT
    
    # Allow outgoing OpenVPN requests.
    $IPTABLES -A OUTPUT -m state --state NEW -p udp --dport 1194 -j ACCEPT
    
    # TODO: ICQ, MSN, GTalk, Skype, Yahoo, etc...
    
    # Selectively allow certain inbound connections, block the rest.
    #------------------------------------------------------------------------------
    
    # Allow incoming DNS requests.
    $IPTABLES -A INPUT -m state --state NEW -p udp --dport 53 -j ACCEPT
    $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 53 -j ACCEPT
    
    # Allow incoming HTTP requests.
    $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 80 -j ACCEPT
    
    # Allow incoming HTTPS requests.
    $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 443 -j ACCEPT
    
    # Allow incoming POP3 requests.
    $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 110 -j ACCEPT
    
    # Allow incoming IMAP4 requests.
    $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 143 -j ACCEPT
    
    # Allow incoming POP3S requests.
    $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 995 -j ACCEPT
    
    # Allow incoming SMTP requests.
    $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 25 -j ACCEPT
    
    # Allow incoming SSH requests.
    $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 22 -j ACCEPT
    
    # Allow incoming FTP requests.
    $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 21 -j ACCEPT
    
    # Allow incoming NNTP requests.
    # $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 119 -j ACCEPT
    
    # Allow incoming MySQL requests.
    # $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 3306 -j ACCEPT
    
    # Allow incoming PLESK requests.
    # $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 8843 -j ACCEPT
    
    # Allow incoming BitTorrent requests.
    # TODO: Are these already handled by ACCEPTing established/related traffic?
    # $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 6881 -j ACCEPT
    # $IPTABLES -A INPUT -m state --state NEW -p udp --dport 6881 -j ACCEPT
    
    # Allow incoming nc requests.
    # $IPTABLES -A INPUT -m state --state NEW -p tcp --dport 2030 -j ACCEPT
    # $IPTABLES -A INPUT -m state --state NEW -p udp --dport 2030 -j ACCEPT
    
    # Explicitly log and reject everything else.
    #------------------------------------------------------------------------------
    # Use REJECT instead of REJECTLOG if you don't need/want logging.
    $IPTABLES -A INPUT -j REJECTLOG
    $IPTABLES -A OUTPUT -j REJECTLOG
    $IPTABLES -A FORWARD -j REJECTLOG
    
    
    #------------------------------------------------------------------------------
    # Testing the firewall.
    #------------------------------------------------------------------------------
    
    # You should check/test that the firewall really works, using
    # iptables -vnL, nmap, ping, telnet, ...
    
    # Exit gracefully.
    #------------------------------------------------------------------------------
    
        exit 0
    
    Code (markup):
    Have a nice day, Ruslan
     
    abuzant, Sep 18, 2008 IP
    shacow likes this.
  2. shacow

    shacow Active Member

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    #2
    excellent. I will keep this as a reference..

    could you explain what it actually does, and if it should be setup in cron etc?
     
    shacow, Sep 18, 2008 IP
  3. iloveRP.com

    iloveRP.com Peon

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    #3
    How to save this script? And what format will be used in saving this script? Where to upload this one?
     
    iloveRP.com, Sep 18, 2008 IP
  4. nimhost

    nimhost Active Member

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    #4
    i think it's same function like csf do :)
     
    nimhost, Sep 18, 2008 IP
  5. abuzant

    abuzant Active Member

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    #5
    shacow> maybe shoot me a 'thanks' reputation point? :D

    ilovePR> this is a UNIX style bash script, save it anywhere on your linux host machine and start it automatically with your server.. shall stop all attacks :D

    nimhost> really?! what a helpful guy you are, keep your bull for yourself if you know it; I posted for people that need it. FO!
     
    abuzant, Sep 19, 2008 IP
  6. shacow

    shacow Active Member

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    #6
    Thanks, so I just start it at boot right? - Is there anything I need to change in the script to get it working?

    Oh and... ermm how do I give you rep?
     
    shacow, Sep 19, 2008 IP
  7. nimhost

    nimhost Active Member

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    #7
    well this is a forum where everyone can talk
    i think you haven't try csf by your self
     
    nimhost, Sep 19, 2008 IP
  8. Tox

    Tox Active Member

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    #8
    Thank you for your share.
     
    Tox, Oct 1, 2008 IP
  9. WoW Blood

    WoW Blood Active Member

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    #9
    How do I like activate this?
     
    WoW Blood, Oct 5, 2008 IP
  10. mywedding

    mywedding Peon

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    #10
    chmod +x "bash-name" (without quotes
     
    mywedding, Oct 10, 2008 IP
  11. jamesfenwick

    jamesfenwick Peon

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    #11
    Will this work for a counter strike server?
     
    jamesfenwick, Nov 26, 2008 IP
  12. abuzant

    abuzant Active Member

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    #12
    Any server, this is a hardware level firewall and does actually care what doi you have on your server.

    PS> you might of course need to alter port numbers of mysql and apache with those of your CS server (see Tcp on CS documentation)

    Good luck, use the redDevil
     
    abuzant, Nov 27, 2008 IP
  13. ecommee

    ecommee Peon

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    #13
    Can i use this all the time? or just if needed?
     
    ecommee, Dec 1, 2008 IP
  14. looking4vps

    looking4vps Peon

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    #14
    how would you install on CentOS 5 vps?
     
    looking4vps, Sep 11, 2010 IP
  15. rsharp

    rsharp Peon

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    #15

    No he can't because he stole it from http://www.hermann-uwe.de/files/fw_laptop. Instead, maybe he can explain why he removed all the credits, helpful comments and GPL license.

    I would strongly advise against using this script unless you have vetted it yourself. The original was a work in progress and this idiot has just removed some of the warnings and TODOs instead of testing and fixing them. He's also added a couple of things that are just plain wrong.

    What is so hard about leaving credit where it's due?

    He doesn't need "shooting a rep point" he just needs plain shooting (preferably in the genitalia).
     
    rsharp, Dec 28, 2010 IP
  16. abuzant

    abuzant Active Member

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    #16
    Hey Mr. DJ,

    Be careful with your language, you are absolutely not welcome here without respect.

    Before you even had your first PC, or knew what a PC is, I was already developing linux scripts.
    This script has been lurking around the web with my name for over 5 years now, did you know what a PC is before 5 years?

    In addition, Mr. Smart***, I would suggest opening your eyes WIDER, and look at the credits where it clearly says:

     
    abuzant, Dec 29, 2010 IP
  17. jarrodw

    jarrodw Peon

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    #17
    Please do not implement iptables conntrack if you do not know what it does. Conntrack has the potential to cause memory exhaustion when implemented incorrectly. If you start to see log lines in your kernel logs that say things like:

    oom-killer: gfp_mask=0x800d0

    or similar lines, or you are getting terrible performance from your server you need to look at how much traffic you are getting compared to the server specification. If the server spec is strong enough to handle the traffic you might be having issues with conntrack.

    Conntrack works like a stack and if you have lots of short lived tcp connections (like HTTP) there is a possibility for high site traffic to cause conntrack table entries to get popped off of the stack causing TCP reset to happen.

    Just be aware of what you are installing. It looks like a good script but it implements things that could cause serious problems if you do not know how they work.

    This is just a heads up, conntrack is great. Just make sure that you educate yourself in how it works at the netfilter site.
     
    jarrodw, Jan 1, 2011 IP
  18. raffo77

    raffo77 Active Member

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    #18
    Good, but all know Linux.. i will be happy to see the same on FreeBSD with pf or ipfw :D
     
    raffo77, Jan 12, 2011 IP
  19. panteng

    panteng Peon

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    #19
    wonderful..... execuse me,, what I have some questions about this script...
    1. How to active this script?? Only change its permission mode??
    2. What the type extention file to save that script ?? PHP ?? or py ??

    thanks.. I hope my questions can be answered...
     
    panteng, Jan 12, 2011 IP
  20. jarrodw

    jarrodw Peon

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    #20
    Extension does not matter on linux. It does when you are running scripts under apache and using mod_php or mod_py
    then you have to have the proper extension configured and even then you can change the extension to something arbitrary.

    For shell scripts you need to have the magic line:

    #!/usr/bin/env perl

    similar for python, ruby, sh etc.

    Open up the script and look at the first line.

    From this line:


    #!/bin/sh


    We can tell that it is a Bourne Shell script. You can save it with .sh or .asdokfjlkgfajslgdfka and both will work. The command line does not care about extensions.

    GCC and CC the compilers for c/cpp will bark errors if you feed a file without .c or .cpp which is proven with the following:


    noway@ridley:~/c$ mv structtest.c structtest1
    noway@ridley:~/c$ gcc structtest1
    structtest1: file not recognized: File format not recognized
    collect2: ld returned 1 exit status


    Now with a .c extension:

    nowayd@ridley:~/c$ gcc structtest.c
    noway@ridley:~/c$ ls
    a.out
     
    Last edited: Jan 12, 2011
    jarrodw, Jan 12, 2011 IP