[Swan] Libreswan version 4.8 abort when connecting with ikev1 xauth with psk

António Silva asilva at wirelessmundi.com
Thu Oct 13 17:29:10 EEST 2022


Hi,

I just update libreswan from version 4.7 to 4.8, but with the newest version I can’t establish a connection whit current configuration, it exit with status 134.
Just revert to version 4.7 and everything working ok.



The log when trying to connect:

Oct 13 15:44:04 sol pluto[3555]: "tunnel8"[1] 16.138.17.119 #1: responding to Main Mode from unknown peer 16.138.17.119:500
Oct 13 15:44:04 sol pluto[3555]: "tunnel8"[1] 16.138.17.119 #1: sent Main Mode R1
Oct 13 15:44:04 sol pluto[3555]: "tunnel8"[1] 16.138.17.119 #1: sent Main Mode R2
Oct 13 15:44:04 sol pluto[3555]: "tunnel8"[1] 16.138.17.119 #1: Peer ID is ID_IPV4_ADDR: '192.168.1.60'
Oct 13 15:44:04 sol pluto[3555]: "tunnel8"[1] 16.138.17.119 #1: switched to "tunnel8"[2] 16.138.17.119
Oct 13 15:44:04 sol pluto[3555]: "tunnel8"[1] 16.138.17.119: deleting connection instance with peer 16.138.17.119 {isakmp=#0/ipsec=#0}
Oct 13 15:44:04 sol pluto[3555]: "tunnel8"[2] 16.138.17.119 #1: IKE SA established {auth=PRESHARED_KEY cipher=AES_CBC_256 integ=HMAC_SHA2_256 group=MODP2048}
Oct 13 15:44:04 sol pluto[3555]: "tunnel8"[2] 16.138.17.119 #1: XAUTH: Sending Username/Password request (MAIN_R3->XAUTH_R0)
Oct 13 15:44:04 sol pluto[3555]: "tunnel8"[2] 16.138.17.119 #1: XAUTH: password file authentication method requested to authenticate user 'asilvapt at mad.lab'
Oct 13 15:44:04 sol pluto[3555]: "tunnel8"[2] 16.138.17.119 #1: XAUTH: password file (/etc/ipsec.d/passwd) open.
Oct 13 15:44:04 sol pluto[3555]: "tunnel8"[2] 16.138.17.119 #1: XAUTH: success user(asilvapt at mad.lab:(null))
Oct 13 15:44:04 sol pluto[3555]: "tunnel8"[2] 16.138.17.119 #1: XAUTH: User asilvapt at mad.lab: Authentication Successful
Oct 13 15:44:04 sol pluto[3555]: "tunnel8"[2] 16.138.17.119 #1: XAUTH: xauth_inR1(STF_OK)
Oct 13 15:44:04 sol pluto[3555]: "tunnel8"[2] 16.138.17.119 #1: IKE SA established {auth=PRESHARED_KEY cipher=AES_CBC_256 integ=HMAC_SHA2_256 group=MODP2048}

Oct 13 15:44:04 sol pluto[3555]: | pool 192.168.20.2-192.168.20.2: growing address pool from 0 to 1
Oct 13 15:44:04 sol pluto[3555]: "tunnel8"[2] 16.138.17.119 #1: modecfg_inR0(STF_OK)
Oct 13 15:44:04 sol pluto[3555]: "tunnel8"[2] 16.138.17.119 #1: sent ModeCfg reply, expecting Ack {auth=PRESHARED_KEY cipher=AES_CBC_256 integ=HMAC_SHA2_256 group=MODP2048}
Oct 13 15:44:04 sol pluto[3555]: "tunnel8"[2] 16.138.17.119 #1: the peer proposed: 192.168.20.0/24 -<all>-> 192.168.20.2/32
Oct 13 15:44:04 sol pluto[3555]: |   checking hostpair 0.0.0.0/0 -> 192.168.20.2/32
Oct 13 15:44:04 sol pluto[3555]: "tunnel8"[2] 16.138.17.119 #2: responding to Quick Mode proposal {msgid:537d8833}
Oct 13 15:44:04 sol pluto[3555]: "tunnel8"[2] 16.138.17.119 #2:     us: 0.0.0.0/0===82.100.227.27[@xauth.lab,MS+XS+S=C]  them: 16.138.17.119[192.168.1.60,+MC+XC+S=C]===192.168.20.2/32
Oct 13 15:44:04 sol pluto[3555]: ABORT: ASSERTION FAILED: pi->inbound.keymat.len == needed_len (compute_proto_keymat() +339 /programs/pluto/ikev1_quick.c)
Oct 13 15:44:04 sol ipsec__plutorun[6759]: !pluto failure!:  exited with error status 134 (signal 6)
Oct 13 15:44:04 sol ipsec__plutorun[6761]: restarting IPsec after pause...



Server configuration: 
conn tunnel8-aggr
	aggrmode=yes
	also=tunnel8

conn tunnel8
	pfs=no
	type=tunnel
	auto=add
	ikev2=no
	phase2=esp
	authby=secret
	keyingtries=3
	ikelifetime=24h
	salifetime=24h
	left=82.100.227.27
	leftsubnet=0.0.0.0/0
	leftid=@xauth.lab
	right=%any
	rightid=%any
	rightaddresspool=192.168.20.100-192.168.20.254
	dpddelay=30
	dpdtimeout=300
	dpdaction=clear
	leftxauthserver=yes
	rightxauthclient=yes
	leftmodecfgserver=yes
	rightmodecfgclient=yes
	modecfgpull=yes
	fragmentation=yes
	xauthby=file




Cliente configuration (using libreswan 4.5)
conn tunnel1
	pfs=no
	type=tunnel
	auto=start
	ikev2=no
	phase2=esp
	authby=secret
	keyingtries=3
	ikelifetime=8h
	salifetime=8h
	left=192.168.1.60
	leftnexthop=16.138.17.119
	right=xauth.lab
	rightsubnet=192.168.20.0/24
	rightid=@xauth.lab
	dpddelay=30
	dpdtimeout=300
	dpdaction=restart
	leftxauthclient=yes
	leftmodecfgclient=yes
	leftusername=asilvapt at mad.lab
	modecfgpull=yes
	fragmentation=yes
	ipsec-interface=yes


Thanks for the help.

Regards,
Antonio



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