netdev - IPSEC IPV4 Tunnel Requires IPV6 WIth 2.6.25?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 15 May 2008 21:09:42 +0100
From:	Alan Swanson <swanson@...sn.org>
To:	netdev@...r.kernel.org
Subject: IPSEC IPV4 Tunnel Requires IPV6 WIth 2.6.25?

Hi. Usual non-subscriber CC replies request please.

There is a problem with 2.6.25(.4) using IPSEC on ipv4. You seem to need
to have ipv6 available otherwise a protocol not supported error is
returned when trying to set a Security Association Database. I'm using
setkey on a file but another user on the ipsec-tools-devel list reported
the same issue using racoon.

http://marc.info/?l=ipsec-tools-devel&m=121015164014761&w=2

So with modules loaded you expect to work.

$ lsmod
  Module                  Size  Used by
  authenc                 5056  0 
  ah4                     4672  0 
  esp4                    5824  0 
  aead                    5824  2 authenc,esp4
  xfrm4_mode_tunnel       2176  20

A static file with tunnel configuration for laptop to desktop over open
wireless not running WEP/WPA.

$ head -n 12 /etc/ipsec.conf
  #!/usr/sbin/setkey -f

  flush;
  spdflush;

  add 1.1.1.1 2.2.2.2 esp 0x500 -m tunnel
  -E rijndael-cbc 0x...
  -A hmac-sha1 0x...;

  add 2.2.2.2 1.1.1.1 esp 0x501 -m tunnel
  -E rijndael-cbc 0x...
  -A hmac-sha1 0x...;

You get protocol not supported error.

$ setkey -f /etc/ipsec.conf
  The result of line 8: Protocol not supported.
  The result of line 12: Protocol not supported.

But after modprobing ipv6 which automatically pulls
in xfrm6_mode_tunnel, setkey starts working and I can communicate via
IPSEC.

$ lsmod
  Module                  Size  Used by
  xfrm6_mode_tunnel       2048  4 
  ipv6                  217444  10 xfrm6_mode_tunnel
  authenc                 5056  4 
  ah4                     4672  0 
  esp4                    5824  4 
  aead                    5824  2 authenc,esp4
  xfrm4_mode_tunnel       2176  28

It really shouldn't need ipv6. Full kernel config, lsmod before and
after modprobing ipv6 are available at below URL's.

http://www.swanson.ukfsn.org/ipsec/config
http://www.swanson.ukfsn.org/ipsec/lsmod-post-modprobe-ipv6
http://www.swanson.ukfsn.org/ipsec/lsmod-pre-modprobe-ipv6

-- 
Alan.

"One must never be purposelessnessnesslessness."
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html