Re: Trying to make extremely secure firewall

2022-01-14 Thread Robert Ricardo Ikaka
https://chng.it/jJvMChbdsJ вс, 26 дек. 2021 г., 02:13 linux_forum1 : > Hello, I'm trying to make the most specific, secure and restrictive > iptables possible for a simple VPN connection on Debian. Could you have a > quick look if those are OK? Thanks so much! > > VPN Server Port:1194 > > VPN Ser

Trying to make extremely secure firewall

2021-12-25 Thread linux_forum1
Hello, I'm trying to make the most specific, secure and restrictive iptables possible for a simple VPN connection on Debian. Could you have a quick look if those are OK? Thanks so much! VPN Server Port:1194 VPN Server IP: 189.174.135.110 -P INPUT DROP -P FORWARD DROP -P OUTPUT DROP #no fragme

firewall

2017-03-31 Thread R Calleja
firewall Description: Binary data

AW: End-user laptop firewall available?

2013-12-10 Thread Hey, Lukas (KRZ)
--Ursprüngliche Nachricht- Von: Jérémie Marguerie [mailto:jere...@marguerie.org] Gesendet: Montag, 9. Dezember 2013 19:17 An: Hey, Lukas (KRZ) Cc: Jordon Bedwell; Debian Betreff: Re: End-user laptop firewall available? On Mon, Dec 9, 2013 at 1:10 AM, Hey, Lukas (KRZ) wrote: > I have a /64 network

Re: End-user laptop firewall available?

2013-12-09 Thread Jason Fergus
On Mon, 2013-12-09 at 20:16 +0100, Javier Fernández-Sanguino Peña wrote: > On Mon, Dec 09, 2013 at 09:41:34AM -0700, Jason Fergus wrote: > > > > > > On Sat, 2013-12-07 at 10:55 -0600, Richard Owlett wrote: > > > I chose phrasing of subject line to emphasize some peculiarities > > > of my needs.

Re: End-user laptop firewall available?

2013-12-09 Thread Javier Fernández-Sanguino Peña
On Mon, Dec 09, 2013 at 09:41:34AM -0700, Jason Fergus wrote: > > > On Sat, 2013-12-07 at 10:55 -0600, Richard Owlett wrote: > > I chose phrasing of subject line to emphasize some peculiarities > > of my needs. > > > > End-user emphasizes: > >- I am *NOT* an expert > >- my system is nev

Re: End-user laptop firewall available?

2013-12-09 Thread Jérémie Marguerie
On Mon, Dec 9, 2013 at 1:10 AM, Hey, Lukas (KRZ) wrote: > I have a /64 network at home. Do you want to scan 2^64 IPs > (18,446,744,073,709,551,616) to get the IP currently used by the laptop which > is changed via the IPv6 privacy extension? The only machine having a fixed > public IPv6 address

Re: End-user laptop firewall available?

2013-12-09 Thread Jason Fergus
y > *WITHOUT* any networking > > When connected to internet it will be: >- primarily for browsing, email, Usenet >- occasionally used for downloading small files using HTTP > *NOT* (never?) FTP > The theory is if that's all you do on a Linux system, then you prob

Re: End-user laptop firewall available?

2013-12-09 Thread Jason Fergus
y > *WITHOUT* any networking > > When connected to internet it will be: >- primarily for browsing, email, Usenet >- occasionally used for downloading small files using HTTP > *NOT* (never?) FTP > The theory is if that's all you do on a Linux system, then you prob

Re: End-user laptop firewall available?

2013-12-09 Thread Javier Fernandez-Sanguino
WiFi is also risky, even if the address space is private, if the WiFi is run by a densely populated area people (or trojans running in other people's devices) might want to see what "machines are out there" in the WiFi and probe/attack them. I've seen this quite a lot in public

AW: End-user laptop firewall available?

2013-12-09 Thread Hey, Lukas (KRZ)
wirklich ausgedruckt werden muss! -Ursprüngliche Nachricht- Von: envyge...@gmail.com [mailto:envyge...@gmail.com] Im Auftrag von Jordon Bedwell Gesendet: Montag, 9. Dezember 2013 09:25 An: Hey, Lukas (KRZ) Cc: Debian Betreff: Re: End-user laptop firewall available? On Mon, Dec 9, 2013 at 2:12

AW: End-user laptop firewall available?

2013-12-09 Thread Hey, Lukas (KRZ)
ender  Bitte prüfen, ob diese Mail wirklich ausgedruckt werden muss! -Ursprüngliche Nachricht- Von: Jérémie Marguerie [mailto:jere...@marguerie.org] Gesendet: Sonntag, 8. Dezember 2013 20:03 An: Riku Valli Cc: Jordon Bedwell; Debian Betreff: Re: End-user laptop firewall available? On Sun

Re: End-user laptop firewall available?

2013-12-08 Thread Jérémie Marguerie
On Sun, Dec 8, 2013 at 9:56 AM, Riku Valli wrote: > Thats true, but if we speaking about firewall rules. Every rule where > source, destination or ports are any means at rule and firewall is most > in cases a useless and this is true most in time a laptop/desktop. > > When som

Re: End-user laptop firewall available?

2013-12-08 Thread Timo Juhani Lindfors
babataz writes: > Here some basic configuration for iptables : If you want to configure these manually you need to also take care of ip6tables. Debian listens on a link-local ipv6 address by default. It can be accessed by anyone in the local network. -- To UNSUBSCRIBE, email to debian-security

Re: End-user laptop firewall available?

2013-12-08 Thread Riku Valli
> to stop that and you couldn't even detect it, protect from it or > anything, the hypervisor is the boss and it can do what it wants, and > you are the guest so you have to play by the houses rules. > Thats true, but if we speaking about firewall rules. Every rule where source,

Re: End-user laptop firewall available?

2013-12-08 Thread Riku Valli
On 12/08/2013 02:44 PM, Volker Birk wrote: > On Sun, Dec 08, 2013 at 01:36:36PM +0100, Frédéric CORNU wrote: >> What about the possibility of a malicious piece of software >> beeing installed and starting listening to incomming connections >> without the knownledge of the system user ? > > What

Re: End-user laptop firewall available?

2013-12-08 Thread Javier Fernández-Sanguino Peña
s I suggest you use a simple firewall tool (GUI-based) to setup a basic firewall configuration. Firewall tools to setup a simple firewall from the Desktop: - Gufw, for GNOME. Available in Debian in the 'gufw' package. https://help.ubuntu.com/community/Gufw - Guarddog, for KDE. It i

Re: End-user laptop firewall available?

2013-12-08 Thread adrelanos
Frédéric CORNU: > Le 08/12/2013 11:34, Bastian Blank a écrit : >> On Sat, Dec 07, 2013 at 10:55:30AM -0600, Richard Owlett wrote: >>> Any help/direction appreciated. >> >> The answer is: None. If you don't have anything listen on the network, >> nothing can be accessed anyway. >> >> Bastian >> > >

Re: End-user laptop firewall available?

2013-12-08 Thread adrelanos
Bastian Blank: > On Sat, Dec 07, 2013 at 10:55:30AM -0600, Richard Owlett wrote: >> Any help/direction appreciated. > > The answer is: None. If you don't have anything listen on the network, > nothing can be accessed anyway. Does Debian still come with open ports in a default installation? --

Re: End-user laptop firewall available?

2013-12-08 Thread Volker Birk
On Sun, Dec 08, 2013 at 01:36:36PM +0100, Frédéric CORNU wrote: > What about the possibility of a malicious piece of software beeing > installed and starting listening to incomming connections without the > knownledge of the system user ? What about the possibility of a malicious piece of software

Re: End-user laptop firewall available?

2013-12-08 Thread Andreas Kuckartz
: >The typical internet connection will be with a USB dial-up modem. >When I desire to browse complex website or download a large set of > files, > I will carry it to a local library and use a WiFi connection. > > A couple months of reading has left me confused as to a sui

Re: End-user laptop firewall available?

2013-12-08 Thread Frédéric CORNU
Le 08/12/2013 11:34, Bastian Blank a écrit : > On Sat, Dec 07, 2013 at 10:55:30AM -0600, Richard Owlett wrote: >> Any help/direction appreciated. > > The answer is: None. If you don't have anything listen on the network, > nothing can be accessed anyway. > > Bastian > What about the possibility

Re: End-user laptop firewall available?

2013-12-08 Thread babataz
>The answer is: None. May I suggest a netstat -tulp to see listening services on this laptop ? While outgoing connections can be discussed, incoming *should* be filtered. Here some basic configuration for iptables : *filter :INPUT DROP [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -

Re: End-user laptop firewall available?

2013-12-08 Thread Bastian Blank
On Sat, Dec 07, 2013 at 10:55:30AM -0600, Richard Owlett wrote: > Any help/direction appreciated. The answer is: None. If you don't have anything listen on the network, nothing can be accessed anyway. Bastian -- Where there's no emotion, there's no motive for violence. -- Spock,

Re: End-user laptop firewall available?

2013-12-08 Thread Riku Valli
On 12/08/2013 04:13 AM, Jérémie Marguerie wrote: > On Sat, Dec 7, 2013 at 4:03 PM, Anatoli Lichii wrote: >> I use ufw/gufw > > A simple firewall configuration is to allow what goes out and only > accept what comes in if it was initiated from your laptop > ("establish

Re: End-user laptop firewall available?

2013-12-07 Thread Jérémie Marguerie
On Sat, Dec 7, 2013 at 4:03 PM, Anatoli Lichii wrote: > I use ufw/gufw A simple firewall configuration is to allow what goes out and only accept what comes in if it was initiated from your laptop ("established" connection). -- Jérémie MARGUERIE -- To UNSUBSCRIBE, email to de

Re: End-user laptop firewall available?

2013-12-07 Thread Anatoli Lichii
; will be: >The typical internet connection will be with a USB dial-up modem. >When I desire to browse complex website or download a large >set of files, > I will carry it to a local library and use a WiFi connection. > >A couple months of reading has left me co

End-user laptop firewall available?

2013-12-07 Thread Richard Owlett
e complex website or download a large set of files, I will carry it to a local library and use a WiFi connection. A couple months of reading has left me confused as to a suitable firewall. Any help/direction appreciated. -- To UNSUBSCRIBE, email to debian-security-requ...@lists.debian.o

Re: btdownloadgui failed due to firewall

2010-07-18 Thread Celejar
ime it waits [ not exit with error]. > > I have simple firewall rule [ as per Rusty Russel ]. > > I found psad-alart says "P2P BitTorrent communication attempt" as > > classtype: policy-violation with "iptables chain: INPUT (prefix > > "Dropping:"

Re: btdownloadgui failed due to firewall

2010-07-18 Thread Dominic Hargreaves
On Sun, Jul 18, 2010 at 11:05:03PM +0530, naths wrote: > I failed to download by "btdownloadgui --responsefile ***.torrent". > Rarely it works and do necessary download very slowly. > Most time it waits [ not exit with error]. > I have simple firewall rule [ as per Rusty Ru

btdownloadgui failed due to firewall

2010-07-18 Thread naths
Hi, I failed to download by "btdownloadgui --responsefile ***.torrent". Rarely it works and do necessary download very slowly. Most time it waits [ not exit with error]. I have simple firewall rule [ as per Rusty Russel ]. I found psad-alart says "P2P BitTorrent communicat

btdownloadgui failed due to firewall

2010-07-18 Thread naths
Hi, I failed to download by "btdownloadgui --responsefile ***.torrent". Rarely it works and do necessary download very slowly. Most time it waits [ not exit with error]. I have simple firewall rule [ as per Rusty Russel ]. I found psad-alart says "P2P BitTorrent communicat

Re: firewall critique

2009-05-07 Thread Florian Weimer
* Zachary Uram: > iptables -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT You should restrict RELATED to ICMP. For TCP and UDP, RELATED can open up your internal network to the outside world (depending on what firewall helpers you have loaded). -- To UNSUBSCRIBE, email

Re: firewall critique

2009-05-06 Thread matteo filippetto
2009/5/7 Zachary Uram : > Hi, > > Running Debian lenny. I run a web server and try to keep all other > ports closed. Would like to get some feedback on my firewall. If you > have any suggestions for rules to add or other changes please let me > know. Also what are some other ste

firewall critique

2009-05-06 Thread Zachary Uram
Hi, Running Debian lenny. I run a web server and try to keep all other ports closed. Would like to get some feedback on my firewall. If you have any suggestions for rules to add or other changes please let me know. Also what are some other steps I can take next to further increase my security

Re: Why not have firewall rules by default?

2008-02-06 Thread Michelle Konzack
Am 2008-01-31 10:02:41, schrieb Chris Ferguson: > What about Firestarter? (www.fs-security.com). Is it a good solution to a > personal use firewall? END OF REPLIED MESSAGE Maybe, but not as default. What about installing D-I question whi

Re: Why not have firewall rules by default?

2008-01-30 Thread Chris Ferguson
ut at least only those, which are REALY > required and not more. > > > Many distros (RPM-based mostly from my experience) ask you during the > > install if you'd like to enable firewall protection. I was curious if > > debian was every going to have this as an option? &

Re: Why not have firewall rules by default?

2008-01-30 Thread Michelle Konzack
ired and not more. > Many distros (RPM-based mostly from my experience) ask you during the > install if you'd like to enable firewall protection. I was curious if > debian was every going to have this as an option? Sorry, but Debian is NOT a "install and do not ask questions" di

Re: Why not have firewall rules by default?

2008-01-29 Thread Javier Fernández-Sanguino Peña
On Mon, Jan 28, 2008 at 06:43:27PM +0100, Florian Weimer wrote: > > Debian has a policy to install as few network services as possible in a > > default install and bind them to the loopback interface if possible. > > Where is this described in Policy? Maybe 'policy' was a rather strict word. Actu

Re: Why not have firewall rules by default?

2008-01-28 Thread Jose Marrero
>> Please check out section 3.6 of the "Securing Debian Manual". IIRC: >> >> - a default install (i.e. one in which you just press "Enter" all the >> way and >> select no tasks) will get you OpenSSH, Exim and portmap, with Exim >> bound to >> the loopback interface. > > portmap is typically n

Re: Why not have firewall rules by default?

2008-01-28 Thread Florian Weimer
* Javier Fernández-Sanguino Peña: > On Wed, Jan 23, 2008 at 11:22:41PM +0100, Florian Weimer wrote: >> The daemon might have been installed by a package dependency, more or >> less by accident. Debian should have a policy that all daemons bind to >> the loopback interface by default, but as long

Re: Why not have firewall rules by default?

2008-01-27 Thread Florian Weimer
t as >>> well. The Linux kernel isn't very efficient at processing firewall >>> rules. Newer >> >> I thought it was very efficient in doing so. YMMV. > > Quite the contrary. It is *dog* *slow* for non-trivial firewalls. It depends a lot on the traffic

Re: Why not have firewall rules by default?

2008-01-27 Thread Javier Fernández-Sanguino Peña
a strict, but more open policy, see https://wiki.ubuntu.com/DefaultNetworkServices Notice, however that the list of network services in Ubuntu was further reduced in the default install as it was (originally) more oriented toward Desktop systems (and not fully UNIX systems) Now they are even thinking on inc

Re: Why not have firewall rules by default?

2008-01-27 Thread Jonas Andradas
Hello, As Javier says: > See > > http://www.debian.org/doc/manuals/securing-debian-howto/ch-sec-services..en.html#s-firewall-setup > : > > Just in case somebody doesn't notice, there is a typo in this URL (double-dot), so I will post it correctly http://www.debian.o

Re: Why not have firewall rules by default?

2008-01-27 Thread Javier Fernández-Sanguino Peña
as removed since it conflicted other firewall packages and it was decided (by the maintainer) that it was better to just provide the tools and let the users select which firewall-ruleset handling tool they wanted to use. > Why is iptables installed by default and why is there no debian way to > load

Re: Why not have firewall rules by default?

2008-01-25 Thread Henrique de Moraes Holschuh
On Fri, 25 Jan 2008, Török Edwin wrote: > If it is 2.6, I suggest you to contact the netfilter mailing list [1], > and show them your firewall rules, What makes you think they don't know about this? It is a design detail of the way netfilter is implemented, and the two methods of acc

Re: Why not have firewall rules by default?

2008-01-25 Thread Török Edwin
t, and from a DoS standpoint as >>> well. The Linux kernel isn't very efficient at processing firewall >>> rules. Newer >>> >> I thought it was very efficient in doing so. YMMV. >> > > Quite the contrary. It is *dog* *slow* for non-triv

Re: Why not have firewall rules by default?

2008-01-25 Thread Henrique de Moraes Holschuh
;t very efficient at processing firewall >> rules. Newer > > I thought it was very efficient in doing so. YMMV. Quite the contrary. It is *dog* *slow* for non-trivial firewalls. You have to use a number of tricks to optimize the rule walk (many tables, hashing, etc), and anything that

Re: Why not have firewall rules by default?

2008-01-25 Thread Brent Clark
Hi Little something on the side, while its in my mind. If there was anything i would like to see, that is more of the netfilters patch o matic's available in the kernel. Hence, less need to wget patch o matic and to follow the process. Its not a big task, but still, total time waster. Anyway

Re: Why not have firewall rules by default?

2008-01-23 Thread Russ Allbery
Florian Weimer <[EMAIL PROTECTED]> writes: > The daemon might have been installed by a package dependency, more or > less by accident. Debian should have a policy that all daemons bind to > the loopback interface by default, but as long as this is not the case, > I can understand why people put p

Re: Why not have firewall rules by default?

2008-01-23 Thread Maximilian Wilhelm
this is the task of the user/admin, not the distro. > On the other hand, at this stage, it's very difficult for Debian as a > distribution to choose what firewall scripting framework should be used. > (But I don't think this is worth the effort.) ACK I think this kind of p

Re: Why not have firewall rules by default?

2008-01-23 Thread James Shupe
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 I believe Debian's method of handling iptables is perfect. if-up.d and its counterparts provide a great means for scripting complex firewall sets. For example, I have written a perl script that parses a custom config file that defines certain IP

Re: Why not have firewall rules by default?

2008-01-23 Thread Florian Weimer
On the other hand, at this stage, it's very difficult for Debian as a distribution to choose what firewall scripting framework should be used. (But I don't think this is worth the effort.) -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]

Re: Why not have firewall rules by default?

2008-01-23 Thread Riku Valli
your server is seriously misconfigured. Regards, Riku Many distros (RPM-based mostly from my experience) ask you during the install if you'd like to enable firewall protection. I was curious if debian was every going to have this as an option? One solution could be to have a folder

Re: Why not have firewall rules by default?

2008-01-23 Thread Riku Valli
William Twomey wrote: If this is needed/wanted to Debian, no problems, but remember obscure isn't security. With fwbuilder, lokkit (Gnome), kmyfirewall (kde) etc is very easy made and maintain firewall/s at Linux and all of these are regular Debian packages. That is true at there shou

Re: Why not have firewall rules by default?

2008-01-23 Thread Rolf Kutz
On 23/01/08 18:48 +0200, Riku Valli wrote: Debian haven't any open services by default, except portmapper and behind portmapper aren't any services. So no need for host firewall. Ack. I didn't want to argue pro a default firewall. regards, Rolf -- ...about the greatest d

Re: Why not have firewall rules by default?

2008-01-23 Thread William Twomey
If this is needed/wanted to Debian, no problems, but remember obscure isn't security. With fwbuilder, lokkit (Gnome), kmyfirewall (kde) etc is very easy made and maintain firewall/s at Linux and all of these are regular Debian packages. That is true at there should be more information

Re: Why not have firewall rules by default?

2008-01-23 Thread Riku Valli
William Twomey wrote: Debian haven't any open services by default, except portmapper and behind portmapper aren't any services. So no need for host firewall. But isn't it reasonable to assume that most people will be installing services? Even a desktop user is likely to enabl

Re: Why not have firewall rules by default?

2008-01-23 Thread Vincent Deffontaines
Michael Loftis wrote: [snip] It's better to leave the service disabled, or even better, completely uninstalled from a security standpoint, and from a DoS standpoint as well. The Linux kernel isn't very efficient at processing firewall rules. Newer kernels might be though (I honest

Re: Why not have firewall rules by default?

2008-01-23 Thread Ondrej Zajicek
> 22ssh, 23ftp, etc. with iptable rules in each file. This is IMHO nonsence. Why to firewall ports where nothing listens? This would not give you anything. > You could also have > an 'ENABLED' variable like some files in /etc/default have (so that > ports wouldn't be op

Re: Why not have firewall rules by default?

2008-01-23 Thread Riku Valli
Rolf Kutz wrote: On 23/01/08 08:29 -0700, Michael Loftis wrote: It's better to leave the service disabled, or even better, completely uninstalled from a security standpoint, and from a DoS standpoint as well. The Linux kernel isn't very efficient at processing firewall rules.

Re: Why not have firewall rules by default?

2008-01-23 Thread maximilian attems
On Wed, Jan 23, 2008 at 08:29:25AM -0700, Michael Loftis wrote: > > It's better to leave the service disabled, or even better, completely > uninstalled from a security standpoint, and from a DoS standpoint as well. > The Linux kernel isn't very efficient at processing

Re: Why not have firewall rules by default?

2008-01-23 Thread Rolf Kutz
On 23/01/08 08:29 -0700, Michael Loftis wrote: It's better to leave the service disabled, or even better, completely uninstalled from a security standpoint, and from a DoS standpoint as well. The Linux kernel isn't very efficient at processing firewall rules. Newer I thought i

Re: Why not have firewall rules by default?

2008-01-23 Thread Michael Loftis
and similar things) are not enabled by default. There was atleast at some point I believe evidence that some platforms/firewalls didn't play well with SYN cookies. I could be wrong. Many distros (RPM-based mostly from my experience) ask you during the install if you'd like to enabl

Re: Why not have firewall rules by default?

2008-01-23 Thread Thomas Damgaard
On Jan 23, 2008 4:19 PM, William Twomey <[EMAIL PROTECTED]> wrote: > One solution could be to have a folder called /etc/security/iptables > that contains files that get passed to iptables at startup (in the same > way /etc/rc2.d gets read in numeric order). So you could have files like > 22ssh, 23f

Why not have firewall rules by default?

2008-01-23 Thread William Twomey
om my experience) ask you during the install if you'd like to enable firewall protection. I was curious if debian was every going to have this as an option? One solution could be to have a folder called /etc/security/iptables that contains files that get passed to iptables at startup (in the same

Re: Firewall with woody

2007-10-17 Thread Simon Valiquette
Jorge Escudero un jour écrivit: I have the Firewall with woody and I never had got any security problem. Is it risky to still using this version? For a firewall, you need to at least upgrade the kernel and patch + recompile ssh and libssl. More library update are also needed if you also

Re: Firewall with woody

2007-10-17 Thread paddy
On Wed, Oct 17, 2007 at 05:23:53PM +0200, Florian Weimer wrote: > * Jorge Escudero: > > > I have the Firewall with woody and I never had got any security problem. > > Is it risky to still using this version? > > Do I have to upgrade the version any time a new one is relea

Re: Firewall with woody

2007-10-17 Thread paddy
On Wed, Oct 17, 2007 at 06:44:31PM +0200, Florian Weimer wrote: > >> > I have the Firewall with woody and I never had got any security problem. > >> > Is it risky to still using this version? > >> > Do I have to upgrade the version any time a new one is rele

Re: Firewall with woody

2007-10-17 Thread Florian Weimer
>> > I have the Firewall with woody and I never had got any security problem. >> > Is it risky to still using this version? >> > Do I have to upgrade the version any time a new one is release? >> >> There have been some kernel issues which affect the IP

Re: Firewall with woody

2007-10-17 Thread Florian Weimer
* Jorge Escudero: > I have the Firewall with woody and I never had got any security problem. > Is it risky to still using this version? > Do I have to upgrade the version any time a new one is release? There have been some kernel issues which affect the IP forwarding path which may o

Re: Firewall with woody

2007-10-17 Thread paddy
On Wed, Oct 17, 2007 at 03:37:04PM +0100, Steve Kemp wrote: > On Wed Oct 17, 2007 at 11:05:58 -0300, Jorge Escudero wrote: > > I have the Firewall with woody and I never had got any security problem. > > Is it risky to still using this version? > > Yes. > >

Re: Firewall with woody

2007-10-17 Thread Steve Kemp
On Wed Oct 17, 2007 at 11:05:58 -0300, Jorge Escudero wrote: > I have the Firewall with woody and I never had got any security problem. > Is it risky to still using this version? Yes. There have been no security updates released for Woody in over a year, and that means there are lia

Firewall with woody

2007-10-17 Thread Jorge Escudero
I have the Firewall with woody and I never had got any security problem. Is it risky to still using this version? Do I have to upgrade the version any time a new one is release? thank you Jorge Escudero Buenos Aires Argentina -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of

Updated firewall script.

2006-06-04 Thread Uwe Hermann
Hi, here's a heavily updated firewall script. I have incorporated many of the suggestions and ideas from the lists (especially debian-firewall). Any further comments and improvement-suggestions are still very welcome! Cheers, Uwe. -- Uwe Hermann http://www.hermann-uwe.de http://w

Re: browser problem from inside firewall

2005-07-05 Thread KC
Hi, I have posted my first firewall script previously.. this is basically the same script but it is optimized.. #! /bin/bash #modprobe ip_conntrack_FTP ### SYMBOLIC CONSTANTS ### CONNECTION_TRACKING="1" DHCP_CLIENT="1" INTERNET="eth1" LOOPBACK_INTERFACE="l

Re: Firewall-troubleshooting

2005-07-05 Thread Stefan Fritsch
Hi! On Tuesday 05 July 2005 14:00, Daniel Pittman wrote: > /sbin/iptables -t filter -A in_world_http_s1 -p tcp --sport 1024:65535 > --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT > /sbin/iptables -t filter -A out_world_http_s1 -p tcp --sport 80 --dport > 1024:65535 -m state --state ESTABL

Re: Firewall-troubleshooting

2005-07-05 Thread Eloi Granado
t > > filter -A out_world_http_s1 -p tcp --sport 80 --dport 1024:65535 -m state > > --state ESTABLISHED -j ACCEPT > > IMHO, this is fairly redundant (and inefficient) unless you don't trust > your firewall. (And in that case, why use it?) The examples of things > that might

Re: Firewall-troubleshooting

2005-07-05 Thread Raffaele D'Elia
Michael Stone wrote: On Tue, Jul 05, 2005 at 11:57:37PM +1000, Daniel Pittman wrote: As to trusting the firewall, or not, there has been at least one bug where attackers could manipulate the content of the conntrack expect table remotely. Other bugs, local or remote, are not out of the

Re: Firewall-troubleshooting

2005-07-05 Thread Michael Stone
On Tue, Jul 05, 2005 at 11:57:37PM +1000, Daniel Pittman wrote: As to trusting the firewall, or not, there has been at least one bug where attackers could manipulate the content of the conntrack expect table remotely. Other bugs, local or remote, are not out of the question. No they'r

Re: Firewall-troubleshooting

2005-07-05 Thread Daniel Pittman
ttp_s1 -p tcp --sport 80 --dport 1024:65535 -m >> state --state ESTABLISHED -j ACCEPT > > IMHO, this is fairly redundant (and inefficient) unless you don't trust > your firewall. (And in that case, why use it?) The examples of things > that might require additional checking (e.g

Re: Firewall-troubleshooting

2005-07-05 Thread Michael Stone
ESTABLISHED -j ACCEPT IMHO, this is fairly redundant (and inefficient) unless you don't trust your firewall. (And in that case, why use it?) The examples of things that might require additional checking (e.g., ftp data connection) are arguably valid valid, but those are *RELATED* sessions

Re: Firewall-troubleshooting

2005-07-05 Thread Daniel Pittman
work through all of this is that i'm a > Shorewall developer and would like to make sure it works in a way that > makes security sense to other firewall users. Sure. I am very glad to see y'all taking such an active interest in the security of your package. It confirms my

Re: Firewall-troubleshooting

2005-07-05 Thread Paul Gear
27;m a Shorewall developer and would like to make sure it works in a way that makes security sense to other firewall users. -- Paul <http://paulgear.webhop.net> -- Did you know? Using Microsoft Internet Explorer can make your computer less secure. Find out more at <http://browsehappy.com>. signature.asc Description: OpenPGP digital signature

Re: Firewall-troubleshooting

2005-07-04 Thread Daniel Pittman
On 5 Jul 2005, Eloi Granado wrote: > On Sunday, 3 de July de 2005 23:24, Paul Gear wrote: >> Daniel Pittman wrote: >>> It also tends to encourage "shortcuts" in the firewall, like accepting >>> any RELATED/ESTABLISHED packets, >> >> Am i r

Re: Firewall-troubleshooting

2005-07-04 Thread Eloi Granado
On Sunday, 3 de July de 2005 23:24, Paul Gear wrote: > Daniel Pittman wrote: > > It also tends to encourage "shortcuts" in the firewall, like accepting > > any RELATED/ESTABLISHED packets, > > Am i right in understanding that you consider accepting > RELATED/ES

Re: Firewall-troubleshooting

2005-07-04 Thread Paul Gear
eaning when he says: > It also tends to encourage "shortcuts" in the firewall, like accepting > any RELATED/ESTABLISHED packets, because each option in the > configuration file is actually an "if" statement around a bit of hand > crafted firewall. and: > Acceptin

Re: Firewall-troubleshooting

2005-07-04 Thread Daniel Pittman
allow them to connect to the SMB server. Firehol would, by default, not have permitted that -- they could have created the 'RELATED' entry in the conntrack table, but the firewall would (probably[1]) still have refuse it, because RELATED packets to that specific port were not allowed.

Re: Firewall-troubleshooting

2005-07-04 Thread Michael Stone
On Mon, Jul 04, 2005 at 07:45:47PM +1000, Paul Gear wrote: I mustn't be understanding you here. Isn't the very definition of RELATED/ESTABLISHED that the packet is part of an established connection to a service actually used? RELATED and ESTABLISHED are two different things. You've defined EST

Re: Firewall-troubleshooting

2005-07-04 Thread Paul Gear
Daniel Pittman wrote: > ... >>Am i right in understanding that you consider accepting >>RELATED/ESTABLISHED packets a bad thing? > > > No. Accepting *any* RELATED/ESTABLISHED packets is, though, if someone > finds an attack to generate entries in the conntrack table. Like, say, > the active FTP

Re: Firewall-troubleshooting

2005-07-03 Thread Daniel Pittman
On 4 Jul 2005, KC wrote: [...] > *nat > :PREROUTING DROP [0:0] > :POSTROUTING DROP [0:0] > :OUTPUT DROP [0:0] > COMMIT I thought that using a policy of DROP in the nat tables would result in anything that wasn't NAT-ed being prevented from passing through by iptables. I can't find any documenta

Re: Firewall-troubleshooting

2005-07-03 Thread KC
Hi, My firewall script doesn't have a problem with it's rules it is just missing something important because when firehol tries it it doesn't give any significant errors. When I turn on my previous firewall it works fine. The place I am working in is a remote place where I am ju

Re: Firewall-troubleshooting

2005-07-03 Thread Daniel Pittman
On 4 Jul 2005, Paul Gear wrote: > Daniel Pittman wrote: >> ... >> Shorewall, like many firewall packages, gives you[1] a whole bunch of >> configuration options, which turn on or off features in the pre-packaged >> firewall you have. >> >> This tends to

Re: Firewall-troubleshooting

2005-07-03 Thread Paul Gear
Daniel Pittman wrote: > ... > Shorewall, like many firewall packages, gives you[1] a whole bunch of > configuration options, which turn on or off features in the pre-packaged > firewall you have. > > This tends to make it hard to do strange things like playing with DSCP > t

Re: Firewall-troubleshooting

2005-07-03 Thread Jakub Sporek
On Sun, 03 Jul 2005 12:23:13 +0200, Daniel Pittman <[EMAIL PROTECTED]> wrote: Thanks a lot! It was really comprehensive! And according to what you wrote - I'll stick with shorewall since it does everything I need and it's easy to manage. On the other hand - I'll start to learn iptables beca

Re: Firewall-troubleshooting

2005-07-03 Thread Daniel Pittman
On 3 Jul 2005, Jakub Sporek wrote: > On Sun, 03 Jul 2005 05:07:02 +0200, Daniel Pittman <[EMAIL PROTECTED]> > wrote: > >> I found that 'firehol' was quite a surprise to me -- not only didn't it >> suck, it actually improved my hand-written firewall somewha

Re: Firewall-troubleshooting

2005-07-03 Thread Paul Gear
Daniel Pittman wrote: > ... >>>Finally, that is a pretty complex firewall script, and obviously >>>somewhat hard to maintain. Maybe you would get better value for your >>>time by using an existing firewall helper like 'firehol', or something, >>>t

Re: Firewall-troubleshooting

2005-07-03 Thread Jakub Sporek
On Sun, 03 Jul 2005 05:07:02 +0200, Daniel Pittman <[EMAIL PROTECTED]> wrote: I found that 'firehol' was quite a surprise to me -- not only didn't it suck, it actually improved my hand-written firewall somewhat. Unlike everything else, it doesn't tell you to

Re: Firewall-troubleshooting

2005-07-03 Thread Sam Couter
Daniel Pittman <[EMAIL PROTECTED]> wrote: > Sure, a lot of them suck. In fact, most of them *really* suck, in my > opinion. > > I found that 'firehol' was quite a surprise to me -- not only didn't it > suck, it actually improved my hand-written firewall so

Re: Firewall-troubleshooting

2005-07-02 Thread KC
Hi, I am tring out firehol right now on a fresh optimized version of this firewall that I decided to make from scratch. The damn thing still won't work. I know I am missing something important in both these scripts because in both cases it drops everything and my rules are not functioning a

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