linux-kernel - Re: [PATCH -resend 4/6] netfilter: Implement RFC 1123 for FTP conntrack

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Message-ID: <20130527122033.GA16107@localhost>
Date:	Mon, 27 May 2013 14:20:33 +0200
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	jirislaby@...il.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, Jeff Mahoney <jeffm@...e.com>,
	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, netdev@...r.kernel.org
Subject: Re: [PATCH -resend 4/6] netfilter: Implement RFC 1123 for FTP
 conntrack

On Wed, May 22, 2013 at 02:59:10PM +0200, Jiri Slaby wrote:
> From: Jeff Mahoney <jeffm@...e.com>
> 
>  The FTP conntrack code currently only accepts the following format for
>  the 227 response for PASV:
>  227 Entering Passive Mode (148,100,81,40,31,161).
> 
>  It doesn't accept the following format from an obscure server:
>  227 Data transfer will passively listen to 67,218,99,134,50,144
> 
>  From RFC 1123:
>  The format of the 227 reply to a PASV command is not
>  well standardized.  In particular, an FTP client cannot
>  assume that the parentheses shown on page 40 of RFC-959
>  will be present (and in fact, Figure 3 on page 43 omits
>  them).  Therefore, a User-FTP program that interprets
>  the PASV reply must scan the reply for the first digit
>  of the host and port numbers.

Applied, thanks.
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