[tproxy] Squid with tproxy extra brief FAQ - take 2
Eduardo Schoedler
eschoedler at viavale.com.br
Thu Feb 28 12:58:03 CET 2008
Hello nantenaina Tianarivo !!!
Thanks for the link.
But, I'm having some troubles to apply it, as you can see below.
In your link is another link, to get the the patch as an attachment.
http://lists.balabit.hu/pipermail/tproxy/attachments/20071220/c6c74b7c/attachment-0001.htm
I've tried it (without the html tags, of course), and did'nt work.
# cat squid-tproxy.patch | patch -p1
patching file src/comm.c
patch: **** malformed patch at line 7: {
Any ideas?
Thanks!
Best Regards,
Eduardo Schoedler.
From: nantenaina Tianarivo
Subject: Re: [tproxy] Squid with tproxy extra brief FAQ - take 2
I have tried the patch for IP_freebind proposed here https://lists.balabit.hu/pipermail/tproxy/2007-December/000638.html and my squid could work with the tproxy4.
Before that it loaded the tproxy2 when compiled with --enable-linux-tproxy
I hope it can help you.
Rivo
On mer, 2008-02-27 at 14:33 -0300, Eduardo Schoedler wrote:
Thanks for the FAQ.
I'm using the (B) Version Tproxy 4.0.x.
However, I haven't found the patch for squid in the site
http://www.balabit.hu/downloads/files/tproxy/.
I'm using SQUID-2.6.17 with "--enable-linux-tproxy".
But this compile options activates suppor for tproxy2 instead tproxy4.0.x,
right ?
How can I found the patch ?
Thanks in advance!
Best Regads,
Eduardo Schoedler.
--------------------------------------------------
From: "Ming-Ching Tiew" <mingching.tiew at redtone.com>
Subject: [tproxy] Squid with tproxy extra brief FAQ - take 2
1. There are at least 3 different versions of tproxy kernel patches.
Each tproxy kernel patch is quite strongly tied to a kernel version,
(A) Version Tproxy2
=============
For kernel 2.6.18
URL: http://www.balabit.hu/downloads/files/tproxy/obsolete/
(B) Version Tproxy 4.0.x
================
For kernel 2.6.22
URL: http://www.balabit.hu/downloads/files/tproxy/
(C) Version Tproxy-4.1.0
=================
For kernel 2.6.25
URL: The "official website" is for kernel <=2.6.24
http://people.netfilter.org/hidden/tproxy
but the actual version of tproxy 4.1 for 2.6.25 is here:
http://people.balabit.hu/panther/tproxy
The kernel patch might work with nearby kernel versions, for example,
tproxy2 might work with kernel 2.6.19; however it will not work
will kernel 2.6.22 ( unless you port it ).
2. Do not confuse tproxy kernel patch mentioned above with
squid user-space patches.
So far the Squid ( 3.0 and 2.6 ) is only supporting on tproxy2 - the
userspace code is integrated.
If you managed to compile Squid without changing the source,
perhaps with only minor changes in header files, meaning you are
likely either did not successfully link in tproxy support or at best it
is using tproxy2, and it will not work with tproxy-4.0.x and
tproxy-4.1.0 kernel counterpart.
However, if you patch the squid source, you should be able
to get squid to work with tproxy-4.0.x and tproxy-4.1.0.
You can look through the archive of this maillist to look at how
to port squid versions to support tproxy-4.0.x and tproxy-4.1.0.
Most of the patches floating around are not fully satisfactory,
but it could work, at least; but perhaps it will require you to have
some programming knowledge.
Here maybe a good start :-
3. All the tproxy kernel patches are not compatible with one another.
Each requires it's own way of setup and usage. So before doing
anything, check if you have gotten the correct info/tproxy
version/patches.
These are some of the info :-
(A) Version Tproxy2
============
The Squid documentation recommends this :-
ebtables -t broute -A BROUTING -p ipv4 --ip-protocol tcp \
--ip-destination-port 80 -j redirect --redirect-target
ACCEPT
This rule will "broute" bridge traffic from br0 to netfilter.
The iptables rule will bring http traffic into local process :-
iptables -t tproxy -A PREROUTING -i br0 -p tcp --dport 80 \
-j TPROXY --on-port 3128
To get SNAT working for tproxy2, there is a need for double NAT,
and here was the discussion and patch :-
https://lists.balabit.hu/pipermail/tproxy/2007-October/000537.html
(B) Version tproxy-4.0.x
================
Requires additional patches for SNAT and FWMARK.
Some hurdles with bridge.
Bridge problem is to do with packets must be marked PACKET_HOST when
heading for br0 as discussed in this tproxy maillist. There have been
people saying they will post the patch for it but yet to date, there
is none.
This problem can be worked around by brouting the traffic into
the real devices instead of br0 :-
INSIDE_DEV=eth0
OUTSIDE_DEV=eth1
ebtables -t broute -A BROUTING -i $INSIDE_DEV -p ipv4 \
--ip-protocol tcp --ip-destination-port 80 \
-j redirect --redirect-target DROP
ebtables -t broute -A BROUTING -i $OUTSIDE_DEV -p ipv4 \
--ip-protocol tcp --ip-source-port 80 \
-j redirect --redirect-target DROP
Please note for real interfaces, it's redirect-target DROP and
not redirect-target ACCEPT, while doing it on br0, it's
redirect-target ACCEPT !
Remember to adjust your iptables rule accordingly since now
packets entering and leaving real interfaces instead of br0.
Example :-
iptables -t tproxy -A PREROUTING -i $INSIDE_DEV \
-p tcp --dport 80 -j TPROXY --on-port 3128
For tproxy-4.0.3 remember to apply the additional kernel patches
mentioned in this maillist or else the kernel will panic accessing
null pointer.
(C) Version tproxy-4.1.0
================
The ebtables/bridge notes above is equally applicable. However
the iptables rules are totally different.
Something like this will be required :-
iptables -t mangle -A PREROUTING -p tcp --dport 80 -j TPROXY \
--tproxy-mark 0x1/0x1 -on-port 3128
iptables -t mangle -N DIVERT
iptables -t mangle -A PREROUTING -p tcp -m socket -j DIVERT
iptables -t mangle -A DIVERT -j MARK --set-mark 1
iptables -t mangle -A DIVERT -j ACCEPT
ip rule add fwmark 1 lookup 100
ip route add local 0.0.0.0/0 dev lo table 100
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