Set up IPSec tunnels between each pair of hosts.

We use a dedicated, non-routable, IPv4 subnet for IPSec.  Furthermore
the subnet is nullrouted in the absence of xfrm lookup (i.e., when there
is no matching IPSec Security Association) to avoid data leaks.

Each host is associated with an IP in that subnet (thus only reachble
within that subnet, either by the host itself or by its IPSec peers).

The peers authenticate each other using RSA public key authentication.
Kernel traps are used to ensure that connections are only established
when traffic is detected between the peers; after 30m of inactivity
(this value needs to be less than the rekeying period) the connection is
brought down and a kernel trap is installed.

1 files changed, 19 insertions, 0 deletions

diff --git a/roles/common/files/etc/logcheck/ignore.d.server/strongswan-local b/roles/common/files/etc/logcheck/ignore.d.server/strongswan-local
new file mode 100644
index 0000000..13218b0
--- /dev/null
+++ b/roles/common/files/etc/logcheck/ignore.d.server/strongswan-local
@@ -0,0 +1,19 @@
+# Ansible Managed
+# Do NOT edit this file directly!
+#
+^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ (charon|ipsec\[[[:digit:]]+\]): [[:digit:]]+\[JOB\] spawning [[:digit:]]+ worker threads$
+^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ (charon|ipsec\[[[:digit:]]+\]): [[:digit:]]+\[KNL\] creating acquire job for policy [[:xdigit:].:]{3,39}/[[:digit:]]+(\[\w+(/[[:alnum:]-]+)?\])? === [[:xdigit:].:]{3,39}/[[:digit:]]+(\[\w+(/[[:alnum:]-]+)?\])? with reqid \{[[:digit:]]+\}$
+^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ (charon|ipsec\[[[:digit:]]+\]): [[:digit:]]+\[KNL\] creating rekey job for ESP CHILD_SA with SPI [[:xdigit:]]{8} and reqid \{[[:digit:]]+\}$
+^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ (charon|ipsec\[[[:digit:]]+\]): [[:digit:]]+\[KNL\] creating delete job for ESP CHILD_SA with SPI [[:xdigit:]]{8} and reqid \{[[:digit:]]+\}$
+^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ (charon|ipsec\[[[:digit:]]+\]): [[:digit:]]+\[KNL\] querying SAD entry with SPI [[:xdigit:]]{8} failed: No such process \([[:digit:]]+\)$
+^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ (charon|ipsec\[[[:digit:]]+\]): [[:digit:]]+\[IKE\] initiating IKE_SA [[:alnum:]._-]+\[[[:digit:]]+\] to [[:xdigit:].:]{3,39}$
+^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ (charon|ipsec\[[[:digit:]]+\]): [[:digit:]]+\[IKE\] [[:xdigit:].:]{3,39} is initiating an IKE_SA$
+^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ (charon|ipsec\[[[:digit:]]+\]): [[:digit:]]+\[IKE\] establishing CHILD_SA [[:alnum:]._-]+(\{[[:digit:]]+\})?$
+^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ (charon|ipsec\[[[:digit:]]+\]): [[:digit:]]+\[IKE\] IKE_SA [[:alnum:]._-]+\[[[:digit:]]+\] established between [[:xdigit:].:]{3,39}\[[^]\"]+\]\.\.\.[[:xdigit:].:]{3,39}\[[^]]+\]$
+^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ (charon|ipsec\[[[:digit:]]+\]): [[:digit:]]+\[IKE\] CHILD_SA [[:alnum:]._-]+\{[[:digit:]]+\} established with SPIs [[:xdigit:]]{8}_i [[:xdigit:]]{8}_o and TS [[:xdigit:].:]{3,39}/[[:digit:]]+ === [[:xdigit:].:]{3,39}/[[:digit:]]+$
+^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ (charon|ipsec\[[[:digit:]]+\]): [[:digit:]]+\[IKE\] closing CHILD_SA [[:alnum:]._-]+\{[[:digit:]]+\} with SPIs [[:xdigit:]]{8}_i \([[:digit:]]+ bytes\) [[:xdigit:]]{8}_o \([[:digit:]]+ bytes\) and TS [[:xdigit:].:]{3,39}/[[:digit:]]+ === [[:xdigit:].:]{3,39}/[[:digit:]]+$
+^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ (charon|ipsec\[[[:digit:]]+\]): [[:digit:]]+\[IKE\] reauthenticating IKE_SA [[:alnum:]._-]+\[[[:digit:]]+\]$
+^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ (charon|ipsec\[[[:digit:]]+\]): [[:digit:]]+\[JOB\] deleting IKE_SA after [[:digit:]]+ seconds of CHILD_SA inactivity$
+^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ (charon|ipsec\[[[:digit:]]+\]): [[:digit:]]+\[IKE\] deleting IKE_SA [[:alnum:]._-]+\[[[:digit:]]+\] between [[:xdigit:].:]{3,39}\[[^]\"]+\]\.\.\.[[:xdigit:].:]{3,39}\[[^]]+\]$
+^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ (charon|ipsec\[[[:digit:]]+\]): [[:digit:]]+\[IKE\] IKE_SA deleted$
+^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ vpn: [+-] .* [[:xdigit:].:]{3,39}/[[:digit:]]+ == [[:xdigit:].:]{3,39} -- [[:xdigit:].:]{3,39} == [[:xdigit:].:]{3,39}/[[:digit:]]+$