[strongSwan] Strongswan client support for the XAUTH_PASSCODE attribute

Thu Apr 16 18:44:04 CEST 2020

Hi,

Just a short update on this issue. Today I managed to setup a SecurID authenticated IKEv2 tunnel
from my Strongswan Linux client to our ScreenOS gateway.

I've been struggling a lot with this over the last days mostly because I have limited knowledge
of RADIUS and EAP. Anyway after testing different EAP methods one by one, it has shown that
the missing piece was the EAP-GTC method and plugin which seems to deal with token passwords.

I still have to find a way to implement dynamic prompting for the OTP, maybe a wrapper script
could deal with that...

Cheers,
/Mikael

On 2020-04-01 19:35, Noel Kuntze wrote:
> Hi,
> 
> AFAIR it doesn't/can't. I'm not sure though. You'd have to check.
> 
> Kind regards
> 
> Noel
> 
> Am 01.04.20 um 19:26 schrieb mnlists at frimail.net:
>> Hi,
>>
>> But the NetworkManager plugin could prompt for a passcode couldn't it?
>>
>> Best regards,
>>
>> /Mikael
>>
>> On 2020-04-01 19:19, Noel Kuntze wrote:
>>> Hi,
>>>
>>> Yw.
>>>
>>> There's also no support for dynamic prompting for EAP credentials.
>>> I envisioned to implement that using VICI some time later. It'd be the natural choice.
>>> Switching to IKEv2 won't solve the problem for you right now.
>>>
>>> Kind regards
>>>
>>> Noel
>>>
>>> Am 01.04.20 um 19:10 schrieb Mikael Nordstrom:
>>>> OK,
>>>>
>>>> Thanks anyway for the quick reply.
>>>>
>>>> The Juniper has IKEv2 support and the RSA SecurID box has a built-in radius server
>>>> so maybe that is the way to go with this.
>>>>
>>>> Thanks again,
>>>>
>>>> /Mikael
>>>>
>>>> On 2020-04-01 18:30, Noel Kuntze wrote:
>>>>> Hi,
>>>>>
>>>>> There's just no frontend to ask dynamically for such credentials yet. You'd need to implement that, then you can dynamically prompt for the passcode (after hooking up X_CODE the same way as X_USER is). Other than that, there are no provisions for X_CODE or anything else. The code base wouldn't be extended particularly for X_CODE because IKEv1 is deprecated.
>>>>>
>>>>> Kind regards
>>>>>
>>>>> Noel
>>>>>
>>>>> Am 01.04.20 um 18:22 schrieb MN Lists:
>>>>>> Hi,
>>>>>>
>>>>>> This is my first message to the list so sorry in advance if the answer is obvious or well-known.
>>>>>> Also, sorry if my terminology is messed up, hopefully you will understand my issue.
>>>>>>
>>>>>> I have a Juniper ScreenOS gateway that does IKEv1 VPNs with RSA and then XAuth authentication
>>>>>> towards an RSA SecurID box. SecurID is an MFA implementation with hardware tokens that display
>>>>>> a new 6-digit number every 60 seconds.
>>>>>>
>>>>>> Clients can connect to it from Mac OS X with a client called NCP Secure Entry and from Windows
>>>>>> with the Shrewsoft client. In the past vpnc on Linux was working but as it has not been developed
>>>>>> since a long time and doesn't support newer algorithms, I'm looking for an alternative and
>>>>>> Strongswan looks promising.
>>>>>>
>>>>>> So far I have been able to get IKE phase1 up but it fails on XAuth. It looks as if the gateway
>>>>>> is sending a request for X_USER and X_CODE but charon is responding with just X_USER. Here is
>>>>>> a log excerpt:
>>>>>>
>>>>>> apr 01 17:48:08 phoenix charon-debug[21177]: 02[IKE] authentication of 'gw.example.com' with RSA_EMSA_PKCS1_NULL successful
>>>>>> apr 01 17:48:08 phoenix charon-debug[21177]: 02[IKE] activating new tasks
>>>>>> apr 01 17:48:08 phoenix charon-debug[21177]: 02[IKE] nothing to initiate
>>>>>> apr 01 17:48:11 phoenix charon-debug[21177]: 07[NET] received packet: from 212.112.174.86[4500] to 172.20.33.34[4500] (92 bytes)
>>>>>> apr 01 17:48:11 phoenix charon-debug[21177]: 07[IKE] next IV for MID 3123281050 => 16 bytes @ 0x7f0304001ed0
>>>>>> apr 01 17:48:11 phoenix charon-debug[21177]: 07[IKE]    0: 51 2C 54 DC D7 31 2D 5F 5D 84 00 10 81 42 88 2B  Q,T..1-_]....B.+
>>>>>> apr 01 17:48:11 phoenix charon-debug[21177]: 07[ENC] parsed TRANSACTION request 3123281050 [ HASH CPRQ(X_TYPE X_USER X_CODE) ]
>>>>>> apr 01 17:48:11 phoenix charon-debug[21177]: 07[IKE] Hash => 32 bytes @ 0x7f03040026b0
>>>>>> apr 01 17:48:11 phoenix charon-debug[21177]: 07[IKE]    0: 87 1C CA 53 F3 1A 81 40 E3 68 E8 78 EA 1C CF CE  ...S... at .h.x....
>>>>>> apr 01 17:48:11 phoenix charon-debug[21177]: 07[IKE]   16: B3 53 17 C6 8C 1B E7 F3 CA DD 50 DC F7 60 97 DD  .S........P..`..
>>>>>> apr 01 17:48:11 phoenix charon-debug[21177]: 07[IKE] next IV for MID 3123281050 => 16 bytes @ 0x7f02f8005600
>>>>>> apr 01 17:48:11 phoenix charon-debug[21177]: 07[IKE]    0: 33 C2 3E 9C 64 14 4C 87 85 C2 1B 26 45 84 2D FF  3.>.d.L....&E.-.
>>>>>> apr 01 17:48:11 phoenix charon-debug[21177]: 07[IKE] Hash => 32 bytes @ 0x7f0304001ed0
>>>>>> apr 01 17:48:11 phoenix charon-debug[21177]: 07[IKE]    0: CB A7 62 8F 3F E0 98 7B 92 75 7F AE 70 B6 E4 0C  ..b.?..{.u..p...
>>>>>> apr 01 17:48:11 phoenix charon-debug[21177]: 07[IKE]   16: 9E B8 66 14 91 79 63 45 5C 9E B1 EF FD B3 5F B9  ..f..ycE\....._.
>>>>>> apr 01 17:48:11 phoenix charon-debug[21177]: 07[ENC] generating TRANSACTION response 3123281050 [ HASH CPRP(X_USER) ]
>>>>>>
>>>>>> Relevant swanctl authentication and secret sections are:
>>>>>>
>>>>>> connections {
>>>>>>     conn1 {
>>>>>>         local-2 {
>>>>>>             auth = xauth-generic
>>>>>>             xauth_id = xauthuser
>>>>>>         }
>>>>>>     }
>>>>>> }
>>>>>>
>>>>>> secrets {
>>>>>>         xauth-1 {
>>>>>>                 id-1 = xauthuser
>>>>>>                 secret = 1234556677
>>>>>>         }
>>>>>>
>>>>>> Is this a well known deficiency in strongswan or is there some configuration that can make
>>>>>> this work?
>>>>>>
>>>>>> I'm happy to supply any further information that could help resolve this.
>>>>>>
>>>>>> Many thanks,
>>>>>> /Mikael
>>>>>>
>>>>>
>>>
> 

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