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#1 2017-12-13 21:41:02

Scriptor
Member
Registered: 2011-01-16
Posts: 136

L2TP Ipsec NetworkManager

Hello,

I am trying to connect to a vpn l2tp server. In order to connect to it I am using the package networkmanager-libreswan. In the network manager I was able to configure a connection (server ip, username, key and PSK). Unfortunately it doesn't work.

Here are some information:

$ journalctl -xe
c. 14 18:46:40 Host-001 pluto[15931]: | refresh. setup callback for interface lo:500 40
déc. 14 18:46:40 Host-001 pluto[15931]: | setup callback for interface lo:500 fd 40
déc. 14 18:46:40 Host-001 pluto[15931]: | refresh. setup callback for interface lo:4500 39
déc. 14 18:46:40 Host-001 pluto[15931]: | setup callback for interface lo:4500 fd 39
déc. 14 18:46:40 Host-001 pluto[15931]: | refresh. setup callback for interface lo:500 38
déc. 14 18:46:40 Host-001 pluto[15931]: | setup callback for interface lo:500 fd 38
déc. 14 18:46:40 Host-001 pluto[15931]: | refresh. setup callback for interface enp3s0:4500 37
déc. 14 18:46:40 Host-001 pluto[15931]: | setup callback for interface enp3s0:4500 fd 37
déc. 14 18:46:40 Host-001 pluto[15931]: | refresh. setup callback for interface enp3s0:500 36
déc. 14 18:46:40 Host-001 pluto[15931]: | setup callback for interface enp3s0:500 fd 36
déc. 14 18:46:40 Host-001 pluto[15931]: forgetting secrets
déc. 14 18:46:40 Host-001 pluto[15931]: loading secrets from "/etc/ipsec.secrets"
déc. 14 18:46:40 Host-001 pluto[15931]: loading secrets from "/etc/ipsec.d/nm-l2tp-ipsec-280e08c1-3c4a-47b3-8dc9-8bf778f5ef9a.secrets"
déc. 14 18:46:40 Host-001 NetworkManager[394]: 010 "280e08c1-3c4a-47b3-8dc9-8bf778f5ef9a" #2: STATE_QUICK_I1: retransmission; will wait 1000ms for response
déc. 14 18:46:41 Host-001 NetworkManager[394]: 010 "280e08c1-3c4a-47b3-8dc9-8bf778f5ef9a" #2: STATE_QUICK_I1: retransmission; will wait 2000ms for response
déc. 14 18:46:43 Host-001 NetworkManager[394]: 010 "280e08c1-3c4a-47b3-8dc9-8bf778f5ef9a" #2: STATE_QUICK_I1: retransmission; will wait 4000ms for response
déc. 14 18:46:47 Host-001 NetworkManager[394]: 010 "280e08c1-3c4a-47b3-8dc9-8bf778f5ef9a" #2: STATE_QUICK_I1: retransmission; will wait 8000ms for response
déc. 14 18:46:49 Host-001 nm-l2tp-service[15300]: g_dbus_method_invocation_take_error: assertion 'error != NULL' failed
déc. 14 18:46:49 Host-001 NetworkManager[394]: <info>  [1513273609.4416] vpn-connection[0x5631b2576350,280e08c1-3c4a-47b3-8dc9-8bf778f5ef9a,"ETNA",0]: VPN plugin: state changed: stopped (6)
déc. 14 18:46:49 Host-001 NetworkManager[394]: <info>  [1513273609.4455] vpn-connection[0x5631b2576350,280e08c1-3c4a-47b3-8dc9-8bf778f5ef9a,"ETNA",0]: VPN service disappeared
déc. 14 18:46:49 Host-001 NetworkManager[394]: <warn>  [1513273609.4472] vpn-connection[0x5631b2576350,280e08c1-3c4a-47b3-8dc9-8bf778f5ef9a,"ETNA",0]: VPN connection: failed to connect: 'Message recipient disconnected from message bus without replying'
déc. 14 18:46:49 Host-001 gnome-shell[1242]: Ignoring excess values in shadow definition
déc. 14 18:46:49 Host-001 gnome-shell[1242]: Ignoring excess values in shadow definition
déc. 14 18:46:49 Host-001 gnome-shell[1242]: Ignoring excess values in shadow definition
déc. 14 18:46:49 Host-001 gnome-shell[1242]: Ignoring excess values in shadow definition
$ systemctl status ipsec
● ipsec.service - Internet Key Exchange (IKE) Protocol Daemon for IPsec
   Loaded: loaded (/usr/lib/systemd/system/ipsec.service; enabled; vendor preset: disabled)
   Active: active (running) since Thu 2017-12-14 18:46:39 CET; 2min 19s ago
     Docs: man:ipsec(8)
           man:pluto(8)
           man:ipsec.conf(5)
  Process: 15322 ExecStopPost=/usr/bin/ipsec --stopnflog (code=exited, status=0/SUCCESS)
  Process: 15321 ExecStopPost=/sbin/ip xfrm state flush (code=exited, status=0/SUCCESS)
  Process: 15320 ExecStopPost=/sbin/ip xfrm policy flush (code=exited, status=0/SUCCESS)
  Process: 15315 ExecStop=/usr/lib/ipsec/whack --shutdown (code=exited, status=0/SUCCESS)
  Process: 15920 ExecStartPre=/usr/bin/ipsec --checknflog (code=exited, status=0/SUCCESS)
  Process: 15919 ExecStartPre=/usr/bin/ipsec --checknss (code=exited, status=0/SUCCESS)
  Process: 15634 ExecStartPre=/usr/lib/ipsec/_stackmanager start (code=exited, status=0/SUCCESS)
  Process: 15633 ExecStartPre=/usr/lib/ipsec/addconn --config /etc/ipsec.conf --checkconfig (code=exited, status=0/SUCCESS)
 Main PID: 15931 (pluto)
   Status: "Startup completed."
    Tasks: 12 (limit: 4915)
   CGroup: /system.slice/ipsec.service
           └─15931 /usr/lib/ipsec/pluto --leak-detective --config /etc/ipsec.conf --nofork

déc. 14 18:46:40 Host-001 pluto[15931]: | refresh. setup callback for interface enp3s0:500 36
déc. 14 18:46:40 Host-001 pluto[15931]: | setup callback for interface enp3s0:500 fd 36
déc. 14 18:46:40 Host-001 pluto[15931]: forgetting secrets
déc. 14 18:46:40 Host-001 pluto[15931]: loading secrets from "/etc/ipsec.secrets"
déc. 14 18:46:40 Host-001 pluto[15931]: loading secrets from "/etc/ipsec.d/nm-l2tp-ipsec-280e08c1-3c4a-47b3-8dc9-8bf778f5ef9a.secrets"
déc. 14 18:47:43 Host-001 pluto[15931]: "280e08c1-3c4a-47b3-8dc9-8bf778f5ef9a" #2: max number of retransmissions (8) reached STATE_QUICK_I1.  No acceptable response to our first Quick Mode message: perhaps peer likes no proposal
déc. 14 18:47:43 Host-001 pluto[15931]: "280e08c1-3c4a-47b3-8dc9-8bf778f5ef9a" #2: starting keying attempt 2 of an unlimited number, but releasing whack
déc. 14 18:47:43 Host-001 pluto[15931]: "280e08c1-3c4a-47b3-8dc9-8bf778f5ef9a" #3: initiating Quick Mode PSK+ENCRYPT+UP+IKEV1_ALLOW+IKEV2_ALLOW+SAREF_TRACK+IKE_FRAG_ALLOW+ESN_NO to replace #2 {using isakmp#1 msgid:418233d1 proposal=3DES(3)_000-SHA1(2) pfsgroup=no-pfs}
déc. 14 18:47:43 Host-001 pluto[15931]: "280e08c1-3c4a-47b3-8dc9-8bf778f5ef9a" #2: deleting state (STATE_QUICK_I1)
déc. 14 18:48:43 Host-001 pluto[15931]: "280e08c1-3c4a-47b3-8dc9-8bf778f5ef9a" #3: deleting state (STATE_QUICK_I1)
$ ipsec verify
Verifying installed system and configuration files

Version check and ipsec on-path                   	[OK]
Libreswan 3.21 (netkey) on 4.14.5-1-ARCH
Checking for IPsec support in kernel              	[OK]
 NETKEY: Testing XFRM related proc values
         ICMP default/send_redirects              	[NOT DISABLED]

  Disable /proc/sys/net/ipv4/conf/*/send_redirects or NETKEY will act on or cause sending of bogus ICMP redirects!

         ICMP default/accept_redirects            	[NOT DISABLED]

  Disable /proc/sys/net/ipv4/conf/*/accept_redirects or NETKEY will act on or cause sending of bogus ICMP redirects!

         XFRM larval drop                         	[OK]
Pluto ipsec.conf syntax                           	[OK]
Two or more interfaces found, checking IP forwarding	[OK]
Checking rp_filter                                	[ENABLED]
 /proc/sys/net/ipv4/conf/all/rp_filter            	[ENABLED]
 /proc/sys/net/ipv4/conf/default/rp_filter        	[ENABLED]
 /proc/sys/net/ipv4/conf/ip_vti0/rp_filter        	[ENABLED]
 /proc/sys/net/ipv4/conf/wlp0s20f0u13/rp_filter   	[ENABLED]
  rp_filter is not fully aware of IPsec and should be disabled
Checking that pluto is running                    	[OK]
 Pluto listening for IKE on udp 500               	[OK]
 Pluto listening for IKE/NAT-T on udp 4500        	[OK]
 Pluto ipsec.secret syntax                        	[UNKNOWN]
 (run ipsec verify as root to test ipsec.secrets)
Checking 'ip' command                             	[OK]
Checking 'iptables' command                       	[OK]
Checking 'prelink' command does not interfere with FIPS	[OK]
Checking for obsolete ipsec.conf options          	[OK]
$ systemctl status xl2tpd
● xl2tpd.service - Level 2 Tunnel Protocol Daemon (L2TP)
   Loaded: loaded (/usr/lib/systemd/system/xl2tpd.service; enabled; vendor preset: disabled)
   Active: active (running) since Wed 2017-12-13 22:07:26 CET; 49min ago
 Main PID: 1066 (xl2tpd)
    Tasks: 1 (limit: 4915)
   CGroup: /system.slice/xl2tpd.service
           └─1066 /usr/bin/xl2tpd -D

archlinux systemd[1]: Started Level 2 Tunnel Protocol Daemon (L2TP).
archlinux xl2tpd[1066]: xl2tpd[1066]: setsockopt recvref[30]: Protocol not available
archlinux xl2tpd[1066]: xl2tpd[1066]: Using l2tp kernel support.
archlinux xl2tpd[1066]: xl2tpd[1066]: xl2tpd version xl2tpd-1.3.10 started on archlinux PID:1066
archlinux xl2tpd[1066]: xl2tpd[1066]: Written by Mark Spencer, Copyright (C) 1998, Adtran, Inc.
archlinux xl2tpd[1066]: xl2tpd[1066]: Forked by Scott Balmos and David Stipp, (C) 2001
archlinux xl2tpd[1066]: xl2tpd[1066]: Inherited by Jeff McAdams, (C) 2002
archlinux xl2tpd[1066]: xl2tpd[1066]: Forked again by Xelerance (www.xelerance.com) (C) 2006-2016
archlinux xl2tpd[1066]: xl2tpd[1066]: Listening on IP address 0.0.0.0, port 1701

/etc/ipsec.config

# /etc/ipsec.conf - Libreswan IPsec configuration file

# Uncomment when using this configuration file with openswan
#version 2
#
# Manual:     ipsec.conf.5

config setup
	# which IPsec stack to use, "netkey" (the default), "klips" or "mast".
	# For MacOSX use "bsd"
	protostack=netkey
	#
	# Normally, pluto logs via syslog. If you want to log to a file,
	# specify below or to disable logging, eg for embedded systems, use
	# the file name /dev/null
	# Note: SElinux policies might prevent pluto writing to a log file at
	#       an unusual location.
	#logfile=/var/log/pluto.log
	#
	# Do not enable debug options to debug configuration issues!
	#
	# plutodebug "all", "none" or a combation from below:
	# "raw crypt parsing emitting control controlmore kernel pfkey
	#  natt x509 dpd dns oppo oppoinfo private".
	# Note: "private" is not included with "all", as it can show confidential
	#       information. It must be specifically specified
	# examples:
	# plutodebug="control parsing"
	# plutodebug="all crypt"
	# Again: only enable plutodebug when asked by a developer
	#plutodebug=none
	#
	# Enable core dumps (might require system changes, like ulimit -C)
	# This is required for abrtd to work properly
	# Note: SElinux policies might prevent pluto writing the core at
	#       unusual locations
	dumpdir=/var/run/pluto/
	#
	# NAT-TRAVERSAL support
	# exclude networks used on server side by adding %v4:!a.b.c.0/24
	# It seems that T-Mobile in the US and Rogers/Fido in Canada are
	# using 25/8 as "private" address space on their wireless networks.
	# This range has never been announced via BGP (at least up to 2015)
	virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:25.0.0.0/8,%v4:100.64.0.0/10,%v6:fd00::/8,%v6:fe80::/10

# For example connections, see your distribution's documentation directory,
# or https://libreswan.org/wiki/
#
# There is also a lot of information in the manual page, "man ipsec.conf"
#
# It is best to add your IPsec connections as separate files in /etc/ipsec.d/
include /etc/ipsec.d/*.conf

Thank you very much in advance for any help.

Last edited by Scriptor (2017-12-14 17:50:38)

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#2 2017-12-16 00:55:32

dkosovic
Member
Registered: 2017-12-16
Posts: 21

Re: L2TP Ipsec NetworkManager

NetworkManager-libreswan is an IPsec IKEv1 with Extended Authentication (XAUTH) VPN client, it doesn't support L2TP or use xl2tpd.

If you need L2TP/IPsec, use NetworkManager-l2tp which uses xl2tpd for L2TP and libreswan or strongswan for IPsec IKEv1 (without XAUTH).

Last edited by dkosovic (2017-12-16 01:07:19)

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#3 2017-12-16 01:06:14

dkosovic
Member
Registered: 2017-12-16
Posts: 21

Re: L2TP Ipsec NetworkManager

If you use NetworkManager-l2tp, don't use kernel-4.14.x as it broke L2TP/IPsec, see:
  https://bugs.archlinux.org/task/56605

You might need to stop the system xl2tpd, see:
  https://github.com/nm-l2tp/network-mana … pd-service

If your VPN server is using weak and old IPsec IKEv1 algorithms, you might need to reconfigure the VPN server or specify the weak algorithms in the NetworkManager-l2tp IPsec options dialog box, see:
  https://github.com/nm-l2tp/network-mana … algorithms

You can query the VPN server for what algorithms is supports by running the ike-scan.sh script on the following page:
  https://github.com/nm-l2tp/network-mana … algorithms

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#4 2017-12-16 11:33:39

Scriptor
Member
Registered: 2011-01-16
Posts: 136

Re: L2TP Ipsec NetworkManager

Thank you very very much for your answer big_smile

I'll look into it. If it's okay I'm not going to mark this post as "SOLVED"

Thank you very much.

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