Date: Mon, 9 Jun 2003 01:05:07 +0300 From: Ruslan Ermilov <ru@freebsd.org> To: Vaclav Petricek <petricek@sec.ms.mff.cuni.cz> Cc: freebsd-security@freebsd.org Subject: Re: redirect unauthorized users to a login page (natd as a transparent proxy) Message-ID: <20030608220507.GA84706@sunbay.com> In-Reply-To: <Pine.BSF.4.50.0306082233300.86521-100000@sec.ms.mff.cuni.cz> References: <Pine.BSF.4.50.0306082233300.86521-100000@sec.ms.mff.cuni.cz>
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--EuxKj2iCbKjpUGkD Content-Type: multipart/mixed; boundary="vtzGhvizbBRQ85DL" Content-Disposition: inline --vtzGhvizbBRQ85DL Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, Jun 08, 2003 at 10:35:47PM +0200, Vaclav Petricek wrote: >=20 > Hello >=20 > I am trying to redirect all http traffic of unauthorized wifi users on a > wireless hotspot to a login page. The problem I have is that I can not > disable the regular address translation (I want the source address to stay > the same). >=20 > 10.0.0.7 is the wifi client > 195.250.155.29 is the web wifi user tries to access from his browser > 195.113.17.94 is my login page > 10.0.0.1 is the wifi interface on the server >=20 > What happens is >=20 > In [TCP] [TCP] 10.0.0.7:1036 -> 195.250.155.29:80 aliased to > [TCP] 10.0.0.1:1036 -> 195.113.17.94:80 >=20 > The natd configuration file: > ------------------------------------------------------------------------- > interface wi0 > port 1234 > #proxy_only yes > reverse > proxy_rule port 80 server 195.113.17.94:80 > ------------------------------------------------------------------------- >=20 > Natd was run as natd -f /etc/natd.conf -v with > 00010 divert 1234 tcp from any to any via wi0 >=20 > I was hoping proxy_only will do the trick but it does not seem to have > any impact and the source address is changed anyway. >=20 > A quick glance at the source did not help much to my understanding of the > proxy_only option. >=20 Confirmed as a bug. The attached patch worked for me, please test it. You'll have to recompile and reinstall libalias(3), then recompile and reinstall natd(8) with new library. Cheers, --=20 Ruslan Ermilov Sysadmin and DBA, ru@sunbay.com Sunbay Software Ltd, ru@FreeBSD.org FreeBSD committer --vtzGhvizbBRQ85DL Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename=p Content-Transfer-Encoding: quoted-printable Index: alias.c =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D RCS file: /home/ncvs/src/lib/libalias/alias.c,v retrieving revision 1.36 diff -u -p -r1.36 alias.c --- alias.c 23 Jul 2002 00:16:19 -0000 1.36 +++ alias.c 8 Jun 2003 21:56:06 -0000 @@ -1057,7 +1057,8 @@ TcpAliasOut(struct ip *pip, int maxpacke =20 link =3D FindUdpTcpOut(pip->ip_src, pip->ip_dst, tc->th_sport, tc->th_dport, - IPPROTO_TCP, 1); + IPPROTO_TCP, + !(packetAliasMode & PKT_ALIAS_PROXY_ONLY)); if (link !=3DNULL) { u_short alias_port; --vtzGhvizbBRQ85DL-- --EuxKj2iCbKjpUGkD Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (FreeBSD) iD8DBQE+47MTUkv4P6juNwoRAsn+AKCHkWjieyXZvyRYzPJngRtWGF85TwCeKzqv GQY7xoDE76TXhD85NnP1ass= =8h8c -----END PGP SIGNATURE----- --EuxKj2iCbKjpUGkD--
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