From owner-freebsd-ipfw@FreeBSD.ORG Wed Oct 11 21:54:00 2006 Return-Path: X-Original-To: freebsd-ipfw@freebsd.org Delivered-To: freebsd-ipfw@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 9DEB616A4AB for ; Wed, 11 Oct 2006 21:54:00 +0000 (UTC) (envelope-from spap13@googlemail.com) Received: from nf-out-0910.google.com (nf-out-0910.google.com [64.233.182.189]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5930343D7C for ; Wed, 11 Oct 2006 21:53:31 +0000 (GMT) (envelope-from spap13@googlemail.com) Received: by nf-out-0910.google.com with SMTP id n15so865866nfc for ; Wed, 11 Oct 2006 14:53:30 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=googlemail.com; h=received:message-id:date:from:to:subject:mime-version:content-type; b=qZjXCrSz8eJ0MOxhgOdO5m2jN21sjvxCBS9yAH2NTLt5vht9Mo5l2smyNU5Ji2KwkwBxZTxcCipYdyPFC+zyVHVRF318lYu4Pp1S5WftzRfPvNZh9tTDnAik05JsYvPZFPCMMRiUZDq3+ytZ+sdVhZrQUgzlmcnppVovb+F3tF0= Received: by 10.48.230.18 with SMTP id c18mr3872610nfh; Wed, 11 Oct 2006 14:53:28 -0700 (PDT) Received: by 10.48.12.1 with HTTP; Wed, 11 Oct 2006 14:53:28 -0700 (PDT) Message-ID: Date: Wed, 11 Oct 2006 22:53:28 +0100 From: "Spiros Papadopoulos" To: freebsd-questions@freebsd.org, freebsd-ipfw@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: Subject: Problems with ipfw and ssh X-BeenThere: freebsd-ipfw@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: IPFW Technical Discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 11 Oct 2006 21:54:00 -0000 Hi, I am trying to configure a firewall using ipfw for a machine running FreeBSD 5.4. Without NAT. I am nearly a newbie on this (since i never had time until now..) but still i believe i understand exactly the concepts and what needs to be done. Except the manual page and chapter 26.1 in the handbook I am using good references such as: http://www.freebsd-howto.com/HOWTO/Ipfw-HOWTO I need to connect remotely to the machine using ssh and this is where i get the problem: Initially i can connect properly using a normal user account. When later i am trying to su to root it does nothing and the connection closes. I have ipfw enabled in the kernel to deny everything by default. I have used both (one at a time) the following rules concerning ssh, in /etc/ipfw.rules and also other combinations, such as taking off setup and keep-state etc etc which would then make my firewall stateless as far as i understood, which is something i don't want anyway. ${addcmd} 300 allow log logamount 5 tcp from any to me 22 setup keep-state - ${addcmd} 300 allow log logamount 5 tcp from any to any ssh keep-state In a first investigation (not thorough) i found this post: http://www.freebsdforums.org/forums/showthread.php?t=21876 where from, i cannot realize what is wrong or how to fix this. I run the sshd in debug mode and below is the portion, for when i am trying to su to root /* sshd -d */ Write failed: Permission denied debug1: do_cleanup debug1: PAM: cleanup debug1: do_cleanup debug1: PAM: cleanup debug1: session_pty_cleanup: session 0 release /dev/ttyp7 And here are related logs: /* line from /var/log/messages */ Oct 11 20:25:54 username sshd[26251]: fatal: Write failed: Permission denied /* /var/log/auth.log */ Sep 26 11:17:34 username sshd[50073]: Connection from xxx.xxx.xxx.xx port 1545 Sep 26 11:17:46 username sshd[50073]: Accepted keyboard-interactive/pam for user from xxx.xxx.xxx.xx port 1545 ssh2 Sep 26 10:17:49 username su: user to root on /dev/ttyp4 Sep 26 11:17:51 username sshd[50068]: Read error from remote host xxx.xxx.xxx.xx: Connection reset by peer Sep 26 13:29:40 username sshd[50076]: Read error from remote host xxx.xxx.xxx.xx: Operation timed out Is it trying to write to a socket? I cannot see what is trying to do and the permission is denied (of course maybe it is in front of me..but..) Could anyone please advice? Thanks in advance Spiros