Date: Mon, 8 Sep 2008 16:03:29 -0400 (EDT) From: "Dan Mahoney, System Admin" <danm@prime.gushi.org> To: Dan Nelson <dnelson@allantgroup.com> Cc: hackers@freebsd.org, questions@freebsd.org Subject: Re: IPFW uid logging... Message-ID: <alpine.BSF.2.00.0809081559490.71254@prime.gushi.org> In-Reply-To: <20080908185106.GB6629@dan.emsphone.com> References: <alpine.BSF.2.00.0809081110480.63702@prime.gushi.org> <20080908185106.GB6629@dan.emsphone.com>
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On Mon, 8 Sep 2008, Dan Nelson wrote: > In the last episode (Sep 08), Dan Mahoney, System Admin said: >> I have the following rule set up in ipfw to limit the exposure of bad >> php scripts and trojans that try to send mail directly. >> >> allow tcp from any to any dst-port 25 uid root >> deny log tcp from any to any dst-port 25 out >> >> However, the log messages I get look like this: >> >> Sep 8 13:21:11 <security.info> prime kernel: ipfw: 610 Deny TCP 72.9.101.130:58117 209.85.133.114:25 out via em0 >> Sep 8 13:21:16 <security.info> prime kernel: ipfw: 610 Deny TCP 72.9.101.130:56672 202.12.31.144:25 out via em0 >> >> Which is to say, they don't include the UID -- and I have several hundred >> sites, each with its own UID. >> >> Yes, I could go ahead and set up a thousand "deny" rules, one for >> each UID -- but being able to log this info (since it IS being >> checked) would be great. > > It should be possible to add a couple more arguments to ipfw_log() so > that ipfw_chk() can pass it the ugid_lookup flag and a pointer to the > fw_ugid_cache struct. Then you can edit ipfw_log to print the contents > of that struct if ugid_lookup==1. That would result in the logging of > uid for any failed packet that had to go through a uid check on the way > to the deny rule. Okay, so if it's fairly easy to do, the question would be "since I don't feel right hacking in this change myself -- how could I propose this as a feature?" It's not a BUG per-se, but I think it could be useful to others as well. -Dan -- Pika Pika Pika! -Pikachu, of Pokemon fame. --------Dan Mahoney-------- Techie, Sysadmin, WebGeek Gushi on efnet/undernet IRC ICQ: 13735144 AIM: LarpGM Site: http://www.gushi.org ---------------------------
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