Using the source address to determine the interface is not correct for
net-to-net shunts between two interfaces on which the host has IP addresses
for each subnet.
Other threads are free to add/update/delete other policies.
This tries to prevent race conditions caused by releasing the mutex while
sending messages to the kernel. For instance, if break-before-make
reauthentication is used and one thread on the responder is delayed in
deleting the policies that another thread is concurrently adding for the
new SA. This could have resulted in no policies being installed
eventually.
Fixes#1400.
If a pseudonym changed a new entry was added to the table storing
permanent identity objects (that are used as keys in the other table).
However, the old mapping was not removed while replacing the mapping in
the pseudonym table caused the old pseudonym to get destroyed. This
eventually caused crashes when a new pseudonym had the same hash value as
such a defunct entry and keys had to be compared.
Fixesstrongswan/strongswan#46.
The versioning scheme used by Python (PEP 440) supports the rcN suffix
but development releases have to be named devN, not drN, which are
not supported and considered legacy versions.
After adding the read callback the state is WATCHER_QUEUED and it is
switched to WATCHER_RUNNING only later by an asynchronous job. This means
that a thread that sent a Netlink message shortly after registration
might see the state as WATCHER_QUEUED. If it then tries to read the
response and the watcher thread is quicker to actually read the message
from the socket, it could block on recv() while still holding the lock.
And the asynchronous job that actually read the message and tries to queue
it will block while trying to acquire the lock, so we'd end up in a deadlock.
This is probably mostly a problem in the unit tests.
Metrics are basically defined to order routes with equal prefix, so ordering
routes by metric first makes not much sense as that could prefer totally
unspecific routes over very specific ones.
For instance, the previous code did break installation of routes for
passthrough policies with two routes like these in the main routing table:
default via 192.168.2.1 dev eth0 proto static
192.168.2.0/24 dev eth0 proto kernel scope link src 192.168.2.10 metric 1
Because the default route has no metric set (0) it was used, instead of the
more specific other one, to determine src and next hop when installing a route
for a passthrough policy for 192.168.2.0/24. Therefore, the installed route
in table 220 did then incorrectly redirect all local traffic to "next hop"
192.168.2.1.
The same issue occurred when determining the source address while
installing trap policies.
Fixes 6b57790270 ("kernel-netlink: Respect kernel routing priorities for IKE routes").
Fixes#1416.
This allows using manual priorities for traps, which have a lower
base priority than the resulting IPsec policies. This could otherwise
be problematic if, for example, swanctl --install/uninstall is used while
an SA is established combined with e.g. IPComp, where the trap policy does
not look the same as the IPsec policy (which is now otherwise often the case
as the reqids stay the same).
It also orders policies by selector size if manual priorities are configured
and narrowing occurs.
The kernel policy now considers src and dst port masks as well as
restictions to a given network interface. The base priority is
100'000 for passthrough shunts, 200'000 for IPsec policies,
300'000 for IPsec policy traps and 400'000 for fallback drop shunts.
The values 1..30'000 can be used for manually set priorities.
This allows two CHILD_SAs with reversed subnets to install two FWD
policies each. Since the outbound policy won't have a reqid set we will
end up with the two inbound FWD policies installed in the kernel, with
the correct templates to allow decrypted traffic.
We can't set a template on the outbound FWD policy (or we'd have to make
it optional). Because if the traffic does not come from another (matching)
IPsec tunnel it would get dropped due to the template mismatch.
This allows us to install more than one FWD policy. We already do this
in the kernel-pfkey plugin (there the original reason was that not all
kernels support FWD policies).
Running or undoing start actions might require enumerating IKE_SAs,
which in turn might have to enumerate peer configs concurrently, which
requires acquiring a read lock. So if we keep holding the write lock while
enumerating the SAs we provoke a deadlock.
By preventing other threads from acquiring the write lock while handling
actions, and thus preventing the modification of the configs, we largely
maintain the current synchronous behavior. This way we also don't need to
acquire additional refs for config objects as they won't get modified/removed.
Fixes#1185.
This allows e.g. modified versions of xl2tpd to set the mark in
situations where two clients are using the same source port behind the
same NAT, which CONNMARK can't restore properly as only one conntrack entry
will exist with the mark set to that of the client that sent the last packet.
Fixes#1230.
Tobias Brunner