[strongSwan] configured DH group CURVE_25519 not supported

Gyula Kovács gyula.kovacs.kkb.tech at gmail.com
Wed Aug 30 10:24:34 CEST 2017 

Hi All,

I've just updated strongSwan from 5.5.1 to 5.6.0.
After the update, I got the "configured DH group CURVE_25519 not 
supported" error message.
The target was working fine before the update, the configuration files 
were not changed during the update.
I found some information on the internet, so I know that Curve25519 
support was introduced in 5.5.2.
I checked the build configuration options, and disabled the curve25519 
support (--disable-curve25519), but it did not help.
I have no idea what might cause the problem.
Any help would be appreciated.

Best regards,
Gyula Kovacs

I added the technical details here.

Target system:
- Linux 3.18.31 #1 PREEMPT Tue Aug 29 12:27:09 CEST 2017 armv7l GNU/Linux
- OpenSSL 1.0.2l  25 May 2017
- strongSwan configuration options:
   --build=x86_64-linux --host=arm-oe-linux-gnueabi 
--target=arm-oe-linux-gnueabi
   --prefix=/usr --exec_prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin
   --libexecdir=/usr/lib/strongswan --datadir=/usr/share --sysconfdir=/etc
   --sharedstatedir=/com --localstatedir=/var --libdir=/usr/lib 
--includedir=/usr/include
   --oldincludedir=/usr/include --infodir=/usr/share/info 
--mandir=/usr/share/man
   --disable-silent-rules --disable-dependency-tracking 
--with-libtool-sysroot=/oe-core/build/tmp-glibc/sysroots/xxxxxxxx
   --without-lib-prefix --without-systemdsystemunitdir --disable-aesni 
--enable-charon --enable-curl --disable-curve25519
   --enable-gmp --disable-ldap --disable-mysql --enable-openssl 
--disable-scepclient --disable-soup --enable-sqlite
   --enable-stroke --disable-swanctl --disable-systemd

Opponent:
- Linux 3.16.0-4-586 #1 Debian 3.16.43-2 (2017-04-30) i686 GNU/Linux
- OpenSSL 1.0.1t  3 May 2016
- strongSwan configuration options:
   ./configure --prefix=/usr --sysconfdir=/etc --disable-curve25519

Error message:
root at mdm9640:~# ipsec up host-host-psk-lan
initiating IKE_SA host-host-psk-lan[1] to 160.48.99.124
configured DH group CURVE_25519 not supported
tried to checkin and delete nonexisting IKE_SA
establishing connection 'host-host-psk-lan' failed
root at mdm9640:~#

root at mdm9640:~# ipsec statusall
Status of IKE charon daemon (strongSwan 5.6.0, Linux 3.18.31, armv7l):
   uptime: 13 seconds, since Jan 01 00:01:30 1970
   malloc: sbrk 540672, mmap 0, used 229400, free 311272
   worker threads: 11 of 16 idle, 5/0/0/0 working, job queue: 0/0/0/0, 
scheduled: 0
   loaded plugins: charon aes des rc2 sha2 sha1 md5 random nonce x509 
revocation constraints pubkey pkcs1 pkcs7 pkcs8 pkcs12 pgp dnskey sshkey 
pem openssl gmp xcbc cmac hmac curl sqlite attr kernel-netlink resolve 
socket-default stroke vici updown xauth-generic
Listening IP addresses:
   160.48.99.98
   160.48.199.98
Connections:
host-host-psk-lan:  160.48.99.98...160.48.99.124  IKEv2
host-host-psk-lan:   local:  [160.48.99.98] uses pre-shared key 
authentication
host-host-psk-lan:   remote: [160.48.99.124] uses pre-shared key 
authentication
host-host-psk-lan:   child:  dynamic === dynamic TRANSPORT
Security Associations (0 up, 0 connecting):
   none
root at mdm9640:~#

Log files:
root at mdm9640:~# cat /var/log/charon.log
Jan  1 00:03:35 00[DMN] Starting IKE charon daemon (strongSwan 5.6.0, 
Linux 3.18.31, armv7l)
Jan  1 00:03:35 00[CFG] loading ca certificates from '/etc/ipsec.d/cacerts'
Jan  1 00:03:35 00[CFG] loading aa certificates from '/etc/ipsec.d/aacerts'
Jan  1 00:03:35 00[CFG] loading ocsp signer certificates from 
'/etc/ipsec.d/ocspcerts'
Jan  1 00:03:35 00[CFG] loading attribute certificates from 
'/etc/ipsec.d/acerts'
Jan  1 00:03:35 00[CFG] loading crls from '/etc/ipsec.d/crls'
Jan  1 00:03:35 00[CFG] loading secrets from '/etc/ipsec.secrets'
Jan  1 00:03:35 00[CFG]   loaded IKE secret for 160.48.99.124
Jan  1 00:03:35 00[CFG]   loaded IKE secret for 160.48.199.124
Jan  1 00:03:35 00[CFG]   loaded RSA private key from 
'/etc/ipsec.d/private/ATM-02_IPsec-internal.key'
Jan  1 00:03:35 00[CFG]   loaded RSA private key from 
'/etc/ipsec.d/private/ATM-02_IPsec-internal.key'
Jan  1 00:03:35 00[LIB] loaded plugins: charon aes des rc2 sha2 sha1 md5 
random nonce x509 revocation constraints pubkey pkcs1 pkcs7 pkcs8 pkcs12 
pgp dnskey sshkey pem openssl gmp xcbc cmac hmac curl sqlite attr 
kernel-netlink resolve socket-default stroke vici updown xauth-generic
Jan  1 00:03:35 00[JOB] spawning 16 worker threads
Jan  1 00:03:35 05[CFG] received stroke: add connection 'host-host-psk-lan'
Jan  1 00:03:35 05[CFG] added configuration 'host-host-psk-lan'
Jan  1 00:03:54 07[CFG] received stroke: initiate 'host-host-psk-lan'
Jan  1 00:03:54 09[IKE] <host-host-psk-lan|1> initiating IKE_SA 
host-host-psk-lan[1] to 160.48.99.124
Jan  1 00:03:54 09[IKE] <host-host-psk-lan|1> configured DH group 
CURVE_25519 not supported
Jan  1 00:03:54 09[MGR] <host-host-psk-lan|1> tried to checkin and 
delete nonexisting IKE_SA
Jan  1 00:04:02 00[DMN] signal of type SIGINT received. Shutting down
root at mdm9640:~#

Aug 30 10:12:51 mgu charon: 00[DMN] Starting IKE charon daemon 
(strongSwan 5.6.0, Linux 3.16.0-4-586, i686)
Aug 30 10:12:51 mgu charon: 00[CFG] loading ca certificates from 
'/etc/ipsec.d/cacerts'
Aug 30 10:12:51 mgu charon: 00[CFG] loading aa certificates from 
'/etc/ipsec.d/aacerts'
Aug 30 10:12:51 mgu charon: 00[CFG] loading ocsp signer certificates 
from '/etc/ipsec.d/ocspcerts'
Aug 30 10:12:51 mgu charon: 00[CFG] loading attribute certificates from 
'/etc/ipsec.d/acerts'
Aug 30 10:12:51 mgu charon: 00[CFG] loading crls from '/etc/ipsec.d/crls'
Aug 30 10:12:51 mgu charon: 00[CFG] loading secrets from 
'/etc/ipsec.secrets'
Aug 30 10:12:51 mgu charon: 00[CFG]   loaded IKE secret for 160.48.99.98
Aug 30 10:12:51 mgu charon: 00[CFG]   loaded IKE secret for 160.48.199.98
Aug 30 10:12:51 mgu charon: 00[CFG]   loaded RSA private key from 
'/etc/ipsec.d/private/MGU_01_IPsec-internal.key'
Aug 30 10:12:51 mgu charon: 00[CFG]   loaded RSA private key from 
'/etc/ipsec.d/private/MGU_01_IPsec-internal.key'
Aug 30 10:12:51 mgu charon: 00[LIB] loaded plugins: charon aes des rc2 
sha2 sha1 md5 random nonce x509 revocation constraints pubkey pkcs1 
pkcs7 pkcs8 pkcs12 pgp dnskey sshkey pem fips-prf gmp xcbc cmac hmac 
attr kernel-netlink resolve socket-default stroke vici updown xauth-generic
Aug 30 10:12:51 mgu charon: 00[JOB] spawning 16 worker threads
Aug 30 10:12:51 mgu charon: 05[CFG] received stroke: add connection 
'host-host-psk-lan'
Aug 30 10:12:51 mgu charon: 05[CFG] added configuration 'host-host-psk-lan'

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