[strongSwan] Help! I can't configure Windows 10 to send remote id (leftid) for IKEv2

Fri Sep 28 11:12:00 CEST 2018

The pre-shared key solution could definitely be worth a try.

I've been experimenting with using "eap_identity" to coerce the selection depending on the provided username (see config below).  Authenticating as "user1" connects me to vpn1 and "user2" connects to vpn2.

Works great in macOS but still having issues with Windows 10. The first authentication attempt always fails and when I retry to connect, the second authentication is successful. Posting the logs below if they are to any help

ipsec.conf
--------------
conn vpn1
  eap_identity=user1
  left=%any
  leftid=@example.org
  leftsubnet=0.0.0.0/0
  right=%any
  rightid=%any
  rightdns=8.8.8.8,8.8.4.4
  rightsourceip=10.10.10.1/24

conn vpn2
  eap_identity=user2
  left=%any
  leftid=@example.org
  leftsubnet=0.0.0.0/0
  right=%any
  rightid=%any
  rightdns=8.8.8.8,8.8.4.4
  rightsourceip=10.10.10.2/24

syslog (first attempt fails)
---------------------------------
charon: 07[NET] received packet: from 36.170.198.412[46981] to 157.140.164.120[500] (1104 bytes)
charon: 07[ENC] parsed IKE_SA_INIT request 0 [ SAKE No N(FRAG_SUP) N(NATD_S_IP) N(NATD_D_IP) V V V V ]
charon: 07[IKE] received MS NT5 ISAKMPOAKLEY v9 vendor ID
charon: 07[IKE] received MS-Negotiation DiscoveryCapable vendor ID
charon: 07[IKE] received Vid-Initial-Contact vendor ID
charon: 07[ENC] received unknown vendor ID: 01:52:8b:bb:c0:06:96:12:18:49:ab:9a:1c:5b:2a:51:00:00:00:02
charon: 07[IKE] 36.170.198.412 is initiating an IKE_SA
charon: 07[IKE] remote host is behind NAT
charon: 07[ENC] generating IKE_SA_INIT response 0[ SA KE No N(NATD_S_IP) N(NATD_D_IP) N(FRAG_SUP) N(MULT_AUTH) ]
charon: 07[NET] sending packet: from 157.140.164.120[500] to 36.170.198.412[46981] (320 bytes)
charon: 12[NET] received packet: from 36.170.198.412[47029] to 157.140.164.120[4500] (576 bytes)
charon: 12[ENC] parsed IKE_AUTH request 1 [ EF(1/2) ]
charon: 12[ENC] received fragment #1 of 2, waiting for complete IKE message
charon: 12[NET] received packet: from 36.170.198.412[47029] to 157.140.164.120[4500] (416 bytes)
charon: 12[ENC] parsed IKE_AUTH request 1 [ EF(2/2) ]
charon: 12[ENC] received fragment #2 of 2, reassembling fragmented IKE message
charon: 12[ENC] parsed IKE_AUTH request 1 [ IDi CERTREQ N(MOBIKE_SUP) CPRQ(ADDR DNS NBNS SRV ADDR6 DNS6 SRV6) SA TSi TSr ]
charon: 12[IKE] received 23 cert requests for an unknown ca
charon: 12[CFG] looking for peer configs matching157.140.164.120[%any]...36.170.198.412[10.0.2.15]
charon: 12[CFG] selected peer config 'vpn2'
charon: 12[IKE] using configured EAP-Identity user2
charon: 12[IKE] initiating EAP_MSCHAPV2 method (id 0xA7)
charon: 12[IKE] peer supports MOBIKE
charon: 12[IKE] authentication of 'example.org' (myself) with RSA signature successful
charon: 12[IKE] sending end entity cert "CN=example.org"
charon: 12[IKE] sending issuer cert "C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3"
charon: 12[ENC] generating IKE_AUTH response 1 [ IDr CERT CERT AUTH EAP/REQ/MSCHAPV2 ]
charon: 12[ENC] splitting IKE message with lengthof 3164 bytes into 3 fragments
charon: 12[ENC] generating IKE_AUTH response 1 [ EF(1/3) ]
charon: 12[ENC] generating IKE_AUTH response 1 [ EF(2/3) ]
charon: 12[ENC] generating IKE_AUTH response 1 [ EF(3/3) ]
charon: 12[NET] sending packet: from 157.140.164.120[4500] to 36.170.198.412[47029] (1248 bytes)
charon: 12[NET] sending packet: from 157.140.164.120[4500] to 36.170.198.412[47029] (1248 bytes)
charon: 12[NET] sending packet: from 157.140.164.120[4500] to 36.170.198.412[47029] (800 bytes)
charon: 06[NET] received packet: from 36.170.198.412[47029] to 157.140.164.120[4500] (140 bytes)
charon: 06[ENC] parsed IKE_AUTH request 2 [ EAP/RES/MSCHAPV2 ]
charon: 06[IKE] EAP-MS-CHAPv2 username: '%any'
charon: 06[IKE] no EAP key found for hosts '%any'- '%any'
charon: 06[IKE] EAP-MS-CHAPv2 verification failed, retry (1)
charon: 14[MGR] ignoring request with ID 2, already processing
charon: 06[ENC] generating IKE_AUTH response 2 [ EAP/REQ/MSCHAPV2 ]
charon: 06[NET] sending packet: from 157.140.164.120[4500] to 36.170.198.412[47029] (124 bytes)
charon: 09[NET] received packet: from 36.170.198.412[47029] to 157.140.164.120[4500] (140 bytes)
charon: 09[ENC] parsed IKE_AUTH request 2 [ EAP/RES/MSCHAPV2 ]
charon: 09[IKE] received retransmit of request with ID 2, retransmitting response
charon: 09[NET] sending packet: from 157.140.164.120[4500] to 36.170.198.412[47029] (124 bytes)

syslog (second attempt succeeds)
---------------------------------------------
charon: 13[NET] received packet: from 36.170.198.412[47029] to 157.140.164.120[4500] (140 bytes)
charon: 13[ENC] parsed IKE_AUTH request 3 [ EAP/RES/MSCHAPV2 ]
charon: 13[ENC] generating IKE_AUTH response 3 [ EAP/REQ/MSCHAPV2 ]
charon: 13[NET] sending packet: from 157.140.164.120[4500] to 36.170.198.412[47029] (140 bytes)
charon: 08[NET] received packet: from 36.170.198.412[47029] to 157.140.164.120[4500] (76 bytes)
charon: 08[ENC] parsed IKE_AUTH request 4 [ EAP/RES/MSCHAPV2 ]
charon: 08[IKE] EAP method EAP_MSCHAPV2 succeeded, MSK established
charon: 08[ENC] generating IKE_AUTH response 4 [ EAP/SUCC ]
charon: 08[NET] sending packet: from 157.140.164.120[4500] to 36.170.198.412[47029] (76 bytes)
charon: 11[NET] received packet: from 36.170.198.412[47029] to 157.140.164.120[4500] (92 bytes)
charon: 11[ENC] parsed IKE_AUTH request 5 [ AUTH ]
charon: 11[IKE] authentication of '10.0.2.15' with EAP successful
charon: 11[IKE] authentication of 'example.org' (myself) with EAP
charon: 11[IKE] IKE_SA vpn2[59] established between 157.140.164.120[example.org]...36.170.198.412[10.0.2.15]
charon: 11[IKE] scheduling reauthentication in 9946s
charon: 11[IKE] maximum IKE_SA lifetime 10486s
charon: 11[IKE] peer requested virtual IP %any
charon: 11[CFG] reassigning offline lease to 'user2'
charon: 11[IKE] assigning virtual IP 10.10.10.2 to peer 'user2'
charon: 11[IKE] peer requested virtual IP %any6
charon: 11[IKE] no virtual IP found for %any6 requested by 'user2'
charon: 11[IKE] CHILD_SA vpn2{8} established withSPIs c5c3c57a_i 18e3d53e_o and TS 0.0.0.0/0 === 10.10.10.2/32
charon: 11[ENC] generating IKE_AUTH response 5 [ AUTH CPRP(ADDR DNS DNS) SA TSi TSr N(AUTH_LFT) N(MOBIKE_SUP) N(ADD_4_ADDR) ]
charon: 11[NET] sending packet: from 157.140.164.120[4500] to 36.170.198.412[47029] (252 bytes)

________________________________
From: bls s <bls3427 at outlook.com>
Sent: Wednesday, September 26, 2018 20:54
To: Marwan Khalili; Christian Salway
Cc: users at lists.strongswan.org
Subject: Re: [strongSwan] Help! I can't configure Windows 10 to send remote id (leftid) for IKEv2

Not trying to muddy the waters, but I think it depends on what Auth method you're using. If you're using cert-based auth with IKEV2 I don't think that there's any way to send an ID. On the other hand, if you're using IPSEC with a pre-shared key, I think you can coerce the selection of a different connection.

It would definitely be interesting to get some definitive input and validated testing on this!

From: Users <users-bounces at lists.strongswan.org> on behalf of Marwan Khalili <choklad_321 at hotmail.com>
Sent: Wednesday, September 26, 2018 5:16 AM
To: Christian Salway
Cc: users at lists.strongswan.org
Subject: Re: [strongSwan] Help! I can't configure Windows 10 to send remote id (leftid) for IKEv2

I have looked through the options but can not find it. Would be very grateful if you could describe how to do it when you have time.

I am using the VPN client built-in Windows 10. I have searched for an option corresponding the "Remote ID" in macOS in the following locations to no avail:
 - Settings -> Network & Internet -> VPN
 - Control Panel -> Network and Internet -> Network Connections
 - rasphone.pbk - %APPDATA%\Microsoft\Network\Connections\Pbk\rasphone.pbk
 - PowerShell documentation for Add-VpnConnection and Set-VpnConnectionIPsecConfiguration

From: Christian Salway <christian.salway at naimuri.com>
Sent: Wednesday, September 26, 2018 01:29
To: bls s
Cc: Marwan Khalili; users at lists.strongswan.org
Subject: Re: [strongSwan] Help! I can't configure Windows 10 to send remote id (leftid) for IKEv2

You can set the ID in windows 10 if you go through the options for the connection you will see it. Not near a computer otherwise I’d get you the instructions.

On 26 Sep 2018, at 02:30, bls s <bls3427 at outlook.com> wrote:

I'm curious about this as well. From my work on pistrong (see elsewhere), it looks to me like Windows doesn't have a way to send an ID that you can use for matching. I haven't tried this, but you might be able to make it work by using a separate "VPN certificate" for the Windows connection that has an altname in it corresponding to a secondary DNS name for your server. You can then have Windows connect to the secondary DNS name and, in theory, it would eventually match that connection.

Again, just a theory, I'm definitely interested in other approaches to solving this.

From: Users <users-bounces at lists.strongswan.org> on behalf of Marwan Khalili <choklad_321 at hotmail.com>
Sent: Tuesday, September 25, 2018 7:47 AM
To: users at lists.strongswan.org
Subject: [strongSwan] Help! I can't configure Windows 10 to send remote id (leftid) for IKEv2

Hello,

I have a strongSwan server running with the ipsec.conf pasted below.

The clients are using Windows 10 and macOS and they must be able to choose connection. I am trying to separate the connections using "leftid" with different subdomains for each connection (e.g. vpn1.example.org, vpn2.example.org).

My solution below works in macOS by matching "Remote ID" with the appropriate "leftid", however I can't get it to work in Windows 10.

I am very grateful to any help or ideas of how I can solve this.

ipsec.conf
--------------
conn %default

  auto=add

  dpdaction=clear

  dpddelay=180s

  eap_identity=%any

  esp=aes256-sha256,aes256-sha1,3des-sha1!

  forceencaps=yes

  ike=aes256-sha1-modp1024,aes128-sha1-modp1024,3des-sha1-modp1024!

  keyexchange=ikev2

  leftcert=cert.pem

  leftsendcert=always

  rightauth=eap-mschapv2

  rightsendcert=never

conn conn1

  left=%any

  leftid=@vpn1.example.org

  leftsubnet=0.0.0.0/0

  right=%any

  rightid=%any

  rightdns=8.8.8.8,8.8.4.4

  rightsourceip=10.10.10.1/24

conn conn2
  left=%any

  leftid=@vpn2.khalili.xyz

  leftsubnet=0.0.0.0/0

  right=%any

  rightid=%any

  rightdns=8.8.8.8,8.8.4.4

  rightsourceip=10.10.10.2/24
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