libreswan: add package

Libreswan is a free software implementation of the most widely
supported and standardized VPN protocol based on ("IPsec") and
the Internet Key Exchange ("IKE"). These standards are produced
and maintained by the Internet Engineering Task Force ("IETF").

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

net/libreswan/files/ipsec.secrets

@@ -0,0 +1,17 @@
+# This file holds shared secrets (PSK) and XAUTH user passwords used for
+# authentication.  See pluto(8) manpage or the libreswan website.
+
+# Unlike older openswan, this file does NOT contain any X.509 related
+# information such as private key :RSA statements as these now reside
+# in the NSS database. See:
+#
+# https://libreswan.org/wiki/Using_NSS_with_libreswan
+# https://libreswan.org/wiki/Migrating_from_Openswan
+#
+# The preferred method for adding secrets is to create a new file in
+# the /etc/ipsec.d/ directory, so it will be included via the include
+# line below
+
+#A.B.C.D %any : PSK "SsEeCcRrEeTt"
+
+include /etc/ipsec.d/*.secrets