From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DA11BC6FA82 for ; Tue, 13 Sep 2022 15:16:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235786AbiIMPQ1 (ORCPT ); Tue, 13 Sep 2022 11:16:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42638 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235798AbiIMPNx (ORCPT ); Tue, 13 Sep 2022 11:13:53 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F4CE786D4; Tue, 13 Sep 2022 07:33:34 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 63E5EB80ECE; Tue, 13 Sep 2022 14:33:27 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CAA77C433D6; Tue, 13 Sep 2022 14:33:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1663079606; bh=ELc75oE5bzpmDnbQtxYYX875CwBCIPaZsO8BHKttdkI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=U+mLwYGDvG6bTUHQcfs6/7QwTd6iZVWBatQchylODAJiit1ieLpfRL4YoDALLv2L1 G0jj7MGx/ZfdiaSpbXKOHWwV6RtUFUAe2RxZBBKqPVndPIvlCM8qsbjH8cZZnExP4N KWIzNH36IDg7Wq6WAZNYJbiBCNK2fRp7hnQuTRBg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, David Leadbeater , Pablo Neira Ayuso , Sasha Levin Subject: [PATCH 4.19 65/79] netfilter: nf_conntrack_irc: Fix forged IP logic Date: Tue, 13 Sep 2022 16:07:23 +0200 Message-Id: <20220913140352.023847282@linuxfoundation.org> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20220913140348.835121645@linuxfoundation.org> References: <20220913140348.835121645@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: David Leadbeater [ Upstream commit 0efe125cfb99e6773a7434f3463f7c2fa28f3a43 ] Ensure the match happens in the right direction, previously the destination used was the server, not the NAT host, as the comment shows the code intended. Additionally nf_nat_irc uses port 0 as a signal and there's no valid way it can appear in a DCC message, so consider port 0 also forged. Fixes: 869f37d8e48f ("[NETFILTER]: nf_conntrack/nf_nat: add IRC helper port") Signed-off-by: David Leadbeater Signed-off-by: Pablo Neira Ayuso Signed-off-by: Sasha Levin --- net/netfilter/nf_conntrack_irc.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/net/netfilter/nf_conntrack_irc.c b/net/netfilter/nf_conntrack_irc.c index 4099f4d79bae7..b7436935b57d0 100644 --- a/net/netfilter/nf_conntrack_irc.c +++ b/net/netfilter/nf_conntrack_irc.c @@ -187,8 +187,9 @@ static int help(struct sk_buff *skb, unsigned int protoff, /* dcc_ip can be the internal OR external (NAT'ed) IP */ tuple = &ct->tuplehash[dir].tuple; - if (tuple->src.u3.ip != dcc_ip && - tuple->dst.u3.ip != dcc_ip) { + if ((tuple->src.u3.ip != dcc_ip && + ct->tuplehash[!dir].tuple.dst.u3.ip != dcc_ip) || + dcc_port == 0) { net_warn_ratelimited("Forged DCC command from %pI4: %pI4:%u\n", &tuple->src.u3.ip, &dcc_ip, dcc_port); -- 2.35.1