From: Richard Weinberger <richard@nod.at>
To: netfilter-devel@vger.kernel.org
Cc: Richard Weinberger <richard@nod.at>
Subject: [PATCH 0/3][RFC] Relationship between conntrack and firewall rules
Date: Thu, 20 Jan 2011 23:47:04 +0100 [thread overview]
Message-ID: <1295563629-14996-1-git-send-email-richard@nod.at> (raw)
Hi,
as a firewall admin I would like to see which rules allow
the connections through my firewall.
A relationship between conntrack and firewall rules would be nice.
The next five patches bring this feature to the Linux Netfilter.
First a small example.
Consider this iptables rules:
-A INPUT -m state --state ESTABLISHED,RELATED -j APPROVE --rule-id 1
-A OUTPUT -m state --state NEW,ESTABLISHED,RELATED -j APPROVE --rule-id 2
-A INPUT -p tcp --dport 22 -m state --state NEW -j APPROVE --rule-id 3
-A INPUT -p icmp -m state --state NEW -j APPROVE --rule-id 4
The APPROVE target is the same as ACCEPT but it stores also a rule id into
the connection tracking entry.
"conntrack -L" shows us this two entries:
tcp 6 431999 ESTABLISHED src=192.168.1.1 dst=192.168.1.2 sport=51444 \
dport=22 src=192.168.1.2 dst=192.168.1.1 sport=22 dport=51444 [ASSURED] \
mark=0 established=1 related=0 new=3 reply=2 use=1
icmp 1 28 src=192.168.1.2 dst=149.20.20.133 type=8 code=0 id=63239 \
src=149.20.20.133 dst=192.168.1.2 type=0 code=0 id=63239 mark=0 \
established=2 related=0 new=2 reply=1 use=1
1. We observe a SSH connection from 192.168.1.1 to 192.168.1.2,
it was allowed by rule 1, 3 and 2. (0 indicates that no rule was involved)
2. An ICMP ping from 192.168.1.2 to 149.20.20.133 which was allowed
by the rules 1 and 2.
The ruleid conntrack extension adds four u_int16_t values.
Thus we can have up to 2^16 rules, I think this is enough
and is not much overhead.
Alternatively we a pointer to a string could also be useful.
Maybe in conjunction with xt_comment...
What do you think?
Any feedback is welcome!
//richard
--
Richard Weinberger (3):
netfilter: add ruleid extension
netfilter: add APPROVE target
netfilter: implement ctnetlink_dump_ruleid()
include/linux/netfilter/nfnetlink_conntrack.h | 4 +
include/linux/netfilter/xt_APPROVE.h | 8 +++
include/net/netfilter/nf_conntrack_extend.h | 2 +
include/net/netfilter/nf_conntrack_ruleid.h | 25 +++++++
net/netfilter/Kconfig | 12 ++++
net/netfilter/Makefile | 3 +-
net/netfilter/nf_conntrack_core.c | 6 ++
net/netfilter/nf_conntrack_netlink.c | 23 +++++++-
net/netfilter/nf_conntrack_ruleid.c | 44 +++++++++++++
net/netfilter/xt_APPROVE.c | 85 +++++++++++++++++++++++++
10 files changed, 210 insertions(+), 2 deletions(-)
create mode 100644 include/linux/netfilter/xt_APPROVE.h
create mode 100644 include/net/netfilter/nf_conntrack_ruleid.h
create mode 100644 net/netfilter/nf_conntrack_ruleid.c
create mode 100644 net/netfilter/xt_APPROVE.c
next reply other threads:[~2011-01-20 22:47 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-20 22:47 Richard Weinberger [this message]
2011-01-20 22:47 ` [PATCH 1/3] netfilter: add ruleid extension Richard Weinberger
2011-01-20 22:47 ` [PATCH 2/3] netfilter: add APPROVE target Richard Weinberger
2011-01-20 22:47 ` [PATCH 3/3] netfilter: implement ctnetlink_dump_ruleid() Richard Weinberger
2011-01-20 22:47 ` [PATCH] iptables: Add APPROVE target Richard Weinberger
2011-01-20 22:47 ` [PATCH] conntrack: Implement ruleid support Richard Weinberger
2011-01-20 23:17 ` [PATCH 2/3] netfilter: add APPROVE target Jan Engelhardt
2011-01-20 23:22 ` Richard Weinberger
2011-01-20 23:27 ` Jan Engelhardt
2011-01-20 23:30 ` Richard Weinberger
2011-01-20 22:52 ` [PATCH 0/3][RFC] Relationship between conntrack and firewall rules Jan Engelhardt
2011-01-20 23:02 ` Richard Weinberger
2011-01-21 10:00 ` Pablo Neira Ayuso
2011-01-21 11:13 ` Richard Weinberger
2011-01-21 11:26 ` Pablo Neira Ayuso
2011-01-21 11:56 ` Richard Weinberger
2011-01-21 12:24 ` Pablo Neira Ayuso
2011-01-21 12:53 ` Richard Weinberger
2011-01-21 13:25 ` Pablo Neira Ayuso
2011-01-21 13:38 ` Richard Weinberger
2011-01-21 13:57 ` Pablo Neira Ayuso
2011-01-21 14:11 ` Richard Weinberger
2011-01-21 15:09 ` Mr Dash Four
2011-01-21 0:04 ` Mr Dash Four
2011-01-21 0:10 ` Richard Weinberger
2011-01-21 0:13 ` Mr Dash Four
2011-01-21 9:58 ` secctx support for conntrack-tools [was Re: [PATCH 0/3][RFC] Relationship between conntrack and firewall rules] Pablo Neira Ayuso
2011-01-21 9:56 ` [PATCH 0/3][RFC] Relationship between conntrack and firewall rules Pablo Neira Ayuso
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1295563629-14996-1-git-send-email-richard@nod.at \
--to=richard@nod.at \
--cc=netfilter-devel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).