[vpn-help] Regression in Linux shrew 2.1.7 -> OpenBSD 4.8+ roadwarrior VPN

[Zak Elep]

Problem:

Linux shrew 2.1.7 (as available in Ubuntu 11.10 Oneiric) could not complete
phase1 negotiation to an OpenBSD 4.8/4.9 VPN gateway; it times out.
 Previous version of shrew in Linux dist (version 2.1.5 in Ubuntu 11.04
Natty) completes this negotiation and connects fine, and as a workaround I
have kept packages of 2.1.5 installed on Oneiric (preventing upgrade to
2.1.7).

To Reproduce:

Connect using shrew 2.1.7 to OpenBSD 4.8/4.9 gateway.

OpenBSD Gateway configuratio uses a simple PSK setup in /etc/ipsec.conf:

  ike passive esp from any to $gateway_ip peer any psk $vpn_password
  ike passive esp from $gateway_ip to any psk $vpn_password

Client Phase 1 & 2 setup:

Authentication:

  - Method: Mutual PSK
  - Local Identity type: IP Address, using discovered host address
  - Credentials: Pre Shared Key (supplied)

Phase 1:

  - Exchange type: main
  - DH Exchange: group 2
  - Cipher algorithm: aes
  - Cipher key length: 256 Bits
  - Hash algorithm: sha1

Phase 2:

  - Transform length: aes
  - Transform key length: 256 Bits
  - HMAC algorithm: sha1
  - PFS Exchange: group 2
  - Compression algorithm: deflate

See also attached iked.log.



-- 
Zak B. Elep || orangeandbronze.com
1486 7957 454D E529 E4F1  F75E 5787 B1FD FA53 851D
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