diffie-hellman: Explicitly initialize DH exponent sizes during initialization

To avoid any race conditions when multiple threads call and initialize
diffie_hellman_get_params(), explicitly examine the optimum DH exponent size
during library initialization.

Fixes #655.
ike-sa-manager: Use transient hasher for IKE_SA_INIT hash calculation

To check if a received IKE_SA_INIT request is a new request or a
retransmit, charon maintains hashes of the pending IKE_SA_INIT
exchanges.

However, the hash calculation is not reentrant because a single hasher
is used for the whole IKE SA manager. It leads to bogus calculations
under high load and hence dropped messages on responder
(IkeInInvalidSpi incremented).

Don't share a single hasher in the IKE SA manager, create a transient
one whenever a message must be hashed.

Signed-off-by: Christophe Gouault <christophe.gouault@6wind.com>
starter: Do not close all file descriptors after fork()

As we use libstrongswan and expect that it still works after the fork, we
can't just closefrom() all file descriptors. Watcher, for example, uses
a pipe to notify FDSET changes, which must be kept open.

Reverts 652ddf5ce2fad08f6569096dd56a821500cc5ba4.
utils: Add some initial build time assertion macros

These are useful to assert constants during build time. We evaluate the
expression to 0 when valid, so we can safely use the evaluated value.
utils: Check if the parameter passed to countof() is actually an array type

This should avoid errors such as the one fixed with 118b2879.
ikev1: Accept Quick Mode DELETES while Quick Mode rekeying is active

If a peer immediately sends DELETE messages when completing Quick Mode rekeying,
the third Quick Mode message and the DELETE are sent simultaneously. This
implies that DELETE messages may arrive before the completing third Quick Mode
message.

Handle this case by ignoring the DELETE INFORMATIONAL in Quick Mode and let
the delete task handle it.
ikev1: Extend adopt_children_job by task queuing, executed after adoption
ikev1: Defer Mode Config push after CHILD adoption and reauth detection

When an initiator starts reauthentication on a connection that uses push
mode to assign a virtual IP, we can't execute the Mode Config before releasing
the virtual IP. Otherwise we would request a new and different lease, which
the client probably can't handle. Defer Mode Config execution, so the same IP
gets first released then reassigned during reauthentication.
ikev1: Defer Mode Config push after CHILD adoption when using XAuth
Merge branch 'push-mode-reauth'

Fixes IKEv1 re-authentication when using push mode by reassigning the same
IP lease to the client.
unity: Handle narrowing according to roles in the IKE_SA

Since the narrow hook types reflect the roles in the Quick Mode exchange
the plugin behaved incorrectly if the server initiated the CHILD_SA
rekeying.
unity: Do not bump TS to 0.0.0.0/0 as initiator when no Split-Include received

When having the unity plugin enabled and both peers send the Unity Vendor ID,
we proposed 0.0.0.0/0 as traffic selector, even if no Split-Include has been
received on the SA. This can break compatibility with some responders, as
they don't narrow the TS themselves, but expect the configured TS.
testing: Make sure the kernel exists when starting
ha: Don't adopt IKEv1 children when building without IKEv1 support

The adopt_children_job_create() function is not available when IKEv1 support
is disabled. Fixes uncommon builds using --enable-ha --disable-ikev1.

Fixes #690.
Generated new test certificates
credmgr: Fix copy and paste error in add_validator

This won't hurt as long as sets and validators are of the same class.
But as soon as one of the object's class is changed this will cause
either a compile error (best option), or result (most likely) in a
crash.

Signed-off-by: Thomas Egerer <thomas.egerer@secunet.com>
openssl: Report correct key length for EC keys when not using NIST curves

Fixes #688.
eap-radius: Forward Cisco and Microsoft specific DNS/NBNS attributes