Note that while PF_KEYv2 also uses sequence numbers to identify acquires,
which we currently don't use correctly by the way, it does not include
information about the packet that triggered an acquire. What we receive
in src and dst, and currently forward as traffic selectors, are actually
the designated endpoints of the SA. So especially in tunnel mode this is
useless to do narrowing on the responder (these addresses might not even
match the configured TS).
With the sequence numbers we don't have to maintain the reqid to delete
the temporary state.
One exception is with labels. There we currently only install trap
policies with the generic label. SAs created from those don't have
policies installed, so we have to reuse the reqid of the trap even if
narrowing occurs.
And as before, we reuse the reqid without checking traffic selectors if
sequence numbers are not supported.
Note that if a CHILD_SA is manually initiated (i.e. has no sequence
number assigned) right before an acquire is triggered, there are several
possible outcomes depending on whether narrowing occurs. If there is no
narrowing, the same reqid is assigned and the kernel will remove the
temporary SA when the SA is installed (no seq => reqid match).
Afterwards, the queued duplicate CHILD_SA is destroyed and the acquire
state in the trap manager gets removed. If there is narrowing, a new
reqid is allocated, so the installation of the SA will not remove the
temporary state. However, due to the narrowing, the duplicate check
fails and when the duplicate is installed (with sequence number), the
temporary state is deleted (as is the state in the trap manager).
Optionally with "dynamic" traffic selectors resolved. A new method
is added for those cases where we actually want to select potentially
narrowed traffic selectors using a supplied list. The latter now also
always logs details, while the former does not.
Either use the sequence number from the kernel (and potentially update
it if the acquire was retriggered), or generate our own sequence
numbers, which simplifies matching acquires to established/destroyed
CHILD_SAs.
When cross-compiling for Windows on Ubuntu, we don't have POSIX regular
expressions available (there does not seem to be any alternative libraries
either), but since the tests are not executed that's OK. On AppVeyor,
MSYS2 has libgnurx installed, which works fine but requires explicit
linking with `-lregex`.
This is loosely based on a patch by Thomas Egerer.
Threads initiating SAs can get stuck on the semaphore in
wait_for_listener() during shutdown if the corresponding job is never
executed. A particular case when this can happen is if more initiations
are triggered than worker threads are available. This causes a (known)
deadlock as no workers are free anymore to process jobs (for inbound
messages or timeouts etc.), including the one to initiate an SA.
This change at least allows a proper shutdown.
The plugin was apparently broken for years because it uses functions that
don't exist anymore. It was quite limited anyway, so it was never really
used in OpenWrt to begin with (instead they generate configs in a custom
init script).
The `crypt` functions defined here conflict with the `crypt` function
defined in `unistd.h` and trigger compilation errors when building
against the latest version of AWS-LC, which introduced a new transitive
include of `unistd.h` via `bio.h`.
This simply renames the function to avoid the error.
Closesstrongswan/strongswan#2786
This changes how EAP identities are used from the config. Instead of
setting a statically configured identity != %any, an EAP-Identity
exchange is now always initiated (and required). If the received identity
doesn't match, the peer config is switched to one with a matching
identity (wildcards are supported for that match). This allows switching
to a config with a different EAP method or child settings based on the
EAP identity.
There is currently no "best" match. The configs are evaluated based on
the order returned from the initial peer config lookup.
References strongswan/strongswan#2702
Newer NDKs have RISC-V as experimental ABI (not enabled by default, see
next commit). If we don't have a mapping for a specific target, OpenSSL
falls back to 'android-arm', so that won't really work (interestingly,
it does build).
These sockets are closed immediately again, so no need to re-protect them
during roaming events.
References strongswan/strongswan#1691
Fixes: 6d87a86510 ("android: Use new sockets to determine source IP")
If this is not set, it looks like NM shuts down the VPN connection and
calls disconnect() if there is any connectivity change.
References strongswan/strongswan#2707
This enables GRO offload for inbound ESP-in-UDP packets if the
esp4|6_offload modules are loaded. Note that inbound ESP or ESP-in-UDP
packets won't be visible on layer 3 in Netfilter or tcpdump.
Increase buffer to 32 bytes to hold uint64_t completely and check for
overflows after multiplication with size modifiers.
Signed-off-by: Thomas Egerer <thomas.egerer@secunet.com>
This allows accepting clients that send proposals with non-optional KE
methods during rekeying, while still accepting clients that use the
previous non-KE default proposals.
This requires a new protocol version as private extensions would enable
unrelated regular extensions, even when sending the private extension
as second attribute (which would work for conditions as they are
explicitly enabled/disabled).
This was originally added with b0e40caafb ("NAT-T conditions were not
inherited during IKE_SA rekeying") in 2008 when there was only a single
inherit() method. Later the inherit_pre() method was added and then
with 094963d1b1 ("ikev2: Apply extensions and conditions before
starting rekeying") in 2014 the extensions and conditions were set
already there.
This avoids conflicts with upstream changes if patched versions of
strongSwan require a number of private extensions and conditions. For
example, the following extensions can be used as usual via the
`enable|supports_extension()` methods:
#define PRIVATE_EXT_1 (EXT_PRIVATE_MARKER | (1<<0))
#define PRIVATE_EXT_2 (EXT_PRIVATE_MARKER | (1<<1))
Defining an enum would also be possible but because the type won't match
the values would have to be cast to `ike_extension_t` when using the
methods.
Similarly, `COND_PRIVATE_MARKER` may be used to define private conditions
that can be used with the `set|has_condition()` methods.
Because the MSB is explicitly not set in `private_extensions|conditions`,
these members may directly be checked against private values, e.g.:
if (this->private_extensions & PRIVATE_EXT_1)
{
}
If this is used, the functionality to set a private key/value/seed for
key exchange methods is removed (including from the interface to avoid
accidentally forgetting to wrap implementations and uses of set_seed()).
The set_seed() method is assigned outside the INIT() macro to avoid
potentially undefined behavior (preprocessing directives in macro
arguments).
The test done by the crypto tester is a simple functionality test.
So far, the timeout value was only used as connect timeout while a
malicious server could accept the connection and then starve us. So use
the timeout for LDAP_OPT_TIMEOUT, too, which affects all synchronous
calls. In particular, ldap_simple_bind_s(), which has no timeout
argument like ldap_search_st().
Signed-off-by: Thomas Egerer <thomas.egerer@secunet.com>
The callbacks provided via ProcessLifecycleOwner are only triggered when
Activities are started. However, when Android triggers the Always-on
VPN it directly starts our VpnService subclass, no Activity. So the
configs were not loaded and the VPN couldn't be initiated with a managed
profile. This ensures the config is loaded right from the start of
the app. And by registering for modifications in onCreate() we can also
use the correct config if the app is never started in-between changes to
the managed profiles and triggering the Always-on VPN.
As described in the previous commit, GCC 15 uses C23 by default and that
changes the meaning of such argument-less function declarations. So
whenever we assign such a function to a pointer that expects a function
with arguments it causes an incompatible pointer type warning. We
could define dedicated functions/callbacks whenever necessary, but this
seems like the simpler approach for now (especially since most uses of
these functions have already been cast).
Tobias Brunner