Ubuntu Security :: Hardening My Firewall ?
Aug 14, 2010
I have a VPS (Ubuntu 8.04 server eition) and as such am stuck with using a software firewall.
i currently have UFW installed.
I would ideally like to have my firewall be a little rude, or rather just not polite. I know what i am asking will break the RFC, but i consider this ok due to the security benefits.
I would like to have my firewall
1) ignore (eg drop without responding)all packets that dont start with a syn flag
2)for all other traffic that is currently blocked, have it dropped (again drop it without responding)
If there are any other rules you can think of i would like to know them. I already have only the services i want open and the rest blocked.
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Jul 16, 2010
I just ponder can anybody shed some light to me how to manually disable service such as FTP,SSH,etc in which Bastille is doing.If all the services can be manually disable,which mean Bastille is just a tool to help newbies like me to use it.
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Sep 1, 2010
I use my desktop (VM) for online transactions only (it has no other purpose) & have removed most software. In adidtion want to remove Archive Manager, Calculator, Multimedia systems selector, Printing, sound recorder, Terminal (gnome-terminal), terminal server client, Ubuntu One. When I attempt to remove the listed software, I receive a waring message "no future desktop updates will include if you remove this". I want to know if this will impact the updates for Firefox as this is the only app I need. Can you please advise on any other consequences if I proceed with the above?
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Mar 22, 2011
When I google this I get a million results, most of which are either too in-depth to be practical or advertisements for one solution or another. Is there a general guideline for hardening a linux (kubuntu) system? A set of steps say, to close all ports and disable all listening services like you would do to a windows machine? I can hardly believe that there are NO vulnerable points of attack on a default kubuntu 10.10 install. I don't know very much right now so I'm looking for something to fill in the gaps and translate my knowledge of windows (in)security into a holistic view of how the penguin operates.
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Mar 27, 2010
I'd like to limit ps aux command outputs to current user only(the one, who invoked "ps". I've recently saw this feature on FreeBSD systems and on at least one Linux system running on shell.sf.net. I run Linux 2.6.33, I wanted to know how to make that. Any advice? Googling around wasn't too successful, perhaps I don't know how to query that, recently tried with "limit ps outputs" "ps aux current user", etc... had no luck.
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May 9, 2011
Can we use iptables as firewall instead of Juniper firewall
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Nov 17, 2010
I run a compute cluster with only a few users. Occasionally a user will accidently run a job on the master node that runs out RAM/swaps then hanges up for a while.In /etc/security/limits.conf I have set memlock to 7.5GB (master has 8GB RAM) and maybe that is what lets the machine come back rather than hanging completely? Is this the right setting to physocally limit a single user from asking for more RAM than the system has and bringing down the system? Should I set this to 2GB or so or is there something else I can do??
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Jan 20, 2011
Which is the best remote linux hardening GUI tool.Is it possible to use that tool from windows system?
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Sep 23, 2010
I have a Suse11 box with 2 network cards:
I have squid as a proxy on the Suse box, and with the default firewall I have to enable masquerading to allow clients on the eth3:1-3 to send and receive mail through the Suse box. I found the Suse firewall completely inadequate (all P2P software/connections are allowed once you enable masquerading) and had to install ConfigServer Security & Firewall. In die configuration of csf I could get my way around getting smtp to work for the eth3:1-3 clients, but pop3 connections does not go through the box. I know I need to allow port 110 and 995 to masquerade of NAT (or something) and then the same for port 22
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Feb 23, 2011
I tried installing F-prot's linux scanner but it doesn't seem to want to install and I am tired of messing with it.
So I am wondering if I even need it or if there is something else.
I am behind a firewall already with my router if that helps any.
I guess I am having trouble understanding why virus protection is less necessary.
Do people not write viruses for linux systems?
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Jul 20, 2010
I have Ubuntu running on an old PE server. It is running Virtualbox with an instance of Ubuntu inside. The instance is there to run my honeypot.
The server box IP is192.168.1.10. The Virtualbox is bridged with it's own IP of 192.168.1.200. The honeypot daemon is listening to 192.168.1.201 with arpd.
I set up the UFW with DENY. And then enabled only the ports leading to the honeypot scripts which are abound to IP .201. I then forwarded the ports necessary to run VNC to .200.
Here is the UFW status:
buntu@ubuntu-desktop:/var/lib$ sudo ufw status
Status: active
To Action From
-- ------ ----
192.168.1.201 21/tcp ALLOW 21/tcp
192.168.1.201 4444/tcp ALLOW 4444/tcp
192.168.1.201 5544/tcp ALLOW 5544/tcp
[Code].....
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May 23, 2010
Will I need to actiavte the firewall that comes with Ubuntu since I'm using Transmission?
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Aug 13, 2010
I am new to the Ubuntu/Linix world (less than a week).
I have tried the search, but have had difficulty finding threads on this.
Can someone recommend an excellent firewall to use with Ubuntu?
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Nov 4, 2010
I've been using Windows for quite a few years now. I loved the way how I used to set incoming/outgoing rules for my applications. But I'm having hard time doing that in Ubuntu. I tried searching for a good GUI for iptables but I need your help selecting the best. I might learn iptables someday but for the time being I will be using a nice GUI. I'm currently using GUFW, I've tried Firestarter. All I need is a firewall that would allow me to configure rules for my applications.
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Jun 15, 2011
I have set up a Ubuntu 10.10 server. I have been using ssh tunnels to encrypt my web traffic at public wifi. I am trying to make this server as secure as posible so I enabled ufw. I allowed SSH and HTTP traffic in and denied everything else. But when I do that I can not use SSH -D because when I try to visit a webpage it does not load and I get the following.
Code:
uname@mybox:~$ channel 3: open failed: connect failed: Connection timed out
^C
uname@mybox:~$ fclchannel 4: open failed: connect failed: Connection timed out
^C
uname@mybox:~$ exit
logout
What do I have to do to allow ufw to allow ssh tunnels through?
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Jun 21, 2011
I am a Linux newbie so please bear with me if I sound stupid. I was checking out how to set up a firewall for my system and landed on this webpage: [URL]. But I am so confused with how this ufw application works. What I understand is that once I set it to "default deny" it prevents unauthorized incoming connection but what does it mean when the author says to add exceptions for services I need? When do I need to do that? Also what's an SSH server?
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Feb 13, 2010
i want set up IDS(Intrusion detection system) and Firewall in my home just for learning.. The Goal is learn IDS log and Firewall log..
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Apr 14, 2010
I'm involved in a project to students set up a network security training lab using vmware. I want to simulate (in a very rough way) scanning through a poorly configured router or firewall. The easiest way I can think of to simulate this is to use a linux vmware image with two virtual nic cards to act as a firewall with the attacker on the outside network and a domain controller, web server, and database server on the inside network.
I would like to start students off with a firewall script that exposes everything on their internal network to the attacker. Is there an easy way to (mis)configure iptables to do this?. The model I'm trying to replicate is something like this. Attackers were on a 10.10.x.x network, defenders were on a 192.168.x.x network. As an attacker I could nmap 192.168.x.x and see every machine and every service on the defenders side even if they moved a service to an unexpected location. how I can implement a similar configuration using a linux image as firewalls/routers in vmware?
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May 9, 2010
I have a set of iptables rules generated by Firestarter, and i'm in the process of trying to familiarise myself with iptables itself, but there's one particular rule which is confusing me, perhaps somebody could explain it to me
My INPUT chain reads as follows:
Code:
Chain INPUT (policy DROP)
target prot opt source destination
ACCEPT tcp -- cdns01.plus.net anywhere tcp flags:!FIN,SYN,RST,ACK/SYN
ACCEPT udp -- cdns01.plus.net anywhere
ACCEPT tcp -- cdns02.plus.net anywhere tcp flags:!FIN,SYN,RST,ACK/SYN
[Code]...
Given that the firewall is actually blocking packets, it can't be this simple, so what am I missing?
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Sep 30, 2010
I'm running the firestarter firewall and its been showing the odd ssh attempt quite often. e.g. I've had 4 attempts today, 3 in the last 40mins. I realize that this may be nothing to serious but it's got me curious, aside from having a secure password (which I have) is there anything that else that I can do to ensure that my system is as secure as possible from ssh? I do use ssh within my home network so I don't want to disable it completely.
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Oct 2, 2010
I have noticed interesting problem. I use two browsers - Firefox and Konqueror. Konqueror is configured to use tor, Firefox not. Using Gufw I block all incoming and outgoing traffic and it works while using Firefox, I mean that I can't view any www site and it is ok. But if I use Konqueror I can establish any conection. How to understand this? Should I have different firewall while using tor?
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Jan 4, 2011
I know that GNU/Linux does not need a firewall (due to iptables), but I would like a basic firewall that would watch incoming and outgoing connections. I would prefer it to have a try icon and be able to run as a regular user, such that I can add it to my .fluxbox/startup file. Anyone know of any good ones? They don't actually have to interface into iptables (because I would do that myself), but if they do it would be a bonus.
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Jan 18, 2011
I run a small (cabled) network between a desktop with XP with two printers hooked to it and a laptop with Ubuntu 10.04.1 64b. I can approach and use these printers from my laptop and filesharing works also. BUT ... this only works when my Ubuntu firewall (Gufw 10.04.5) is switched off. I am operating behind my router_modem which has a hardware type of firewall switched on at all times so I presume I'm safe. Now my questions:
1. Is this really safe enough?
2. What kind of settings would Gufw need to be able to use it AND use my mini-network for printing? I have no experience whatsoever with firewall rules and settings.
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Feb 15, 2011
I want to have a firewall that is connected to my modem and router and have it function as just a firewall no dhcp no routing is that possible?
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Apr 28, 2011
i want to install a firewall for my ubuntu server (vps)what the best firewall for ubuntu? my ram is 512 mb.how to install firewall from console ?
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Mar 7, 2011
Setting up firewall
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Jan 12, 2010
how do i modify the ubuntu firewall to let in certain ip addresses but lock others out.
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Jan 17, 2010
I am currently trying to make my computer as secure as it can possibly be. I am configuring the firewall to be restrictive by default, but I have some programs that are still unable to connect to the internet.
1. Pidgin Internet Messenger (I use AIM and MSN)
2. Skype
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Jun 10, 2010
What is a good IP filter/firewall program? Seeing as how I like free softwares, I download a lot of torrents. When I was using Windows, I used PeerBlock (the newer fork of PeerGuardian), however, it's not available for Linux. What would be a good alternative for this in Linux? I tried iplist as it has a GUI, and it was extremely buggy and blocked random web pages even after I put them on the exceptions list. And MoBlock has no GUI from I understand, nor has it been updated in years.
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Jul 25, 2010
Is there a firewall I can install that will only let certain MAC addresses through on a certain port?
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