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This allows us to remove a lot of conditionally compiled code and so
know with more certaintly that our tests are covering our codepaths.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Since memcmp_const_time() doesn't act as an exact replacement for
memcmp(), and its return value is only ever compared with zero, simplify
it and emphasize the intention of checking equality by returning a bool
instead.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This helps to avoid timing attacks.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15010
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This implements the note from MS-NRPC 3.1.4.1 Session-Key Negotiation:
7. If none of the first 5 bytes of the client challenge is unique, the
server MUST fail session-key negotiation without further processing of
the following steps.
It lets ./zerologon_tester.py from
https://github.com/SecuraBV/CVE-2020-1472.git
report: "Attack failed. Target is probably patched."
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14497
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
This is the check Windows is using, so we won't generate challenges,
which are rejected by Windows DCs (and future Samba DCs).
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14497
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
It's good to have just a single isolated function that will generate
random challenges, in future we can add some logic in order to
avoid weak values, which are likely to be rejected by a server.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14497
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14195
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Thu Nov 14 09:25:36 UTC 2019 on sn-devel-184
Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Adapted by Andrew Bartlett to use gnutls_error_to_ntstatus()
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Wed Feb 27 03:22:50 CET 2019 on sn-devel-144
ZERO_STRUCT is not wrong here, it will give the same result, but better
use macros with correct naming as it makes clear what happens when you
read the code.
Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
If the last usage of netlogon_creds_client_authenticator()
is in the past try to use the current timestamp and increment
more than just 2.
If we use netlogon_creds_client_authenticator() a lot within a
second, we increment keep incrementing by 2.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Tue Dec 24 13:18:18 CET 2013 on sn-devel-104
creds->sequence (timestamp) is the value that is used to increment the internal
state, it's not a real sequence number. The sequence comes
from adding all timestamps of the whole session.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This is what windows returns, the value is ignored by the client anyway.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This can be used before netlogon_creds_encrypt_samlogon_logon()
in order to keep the provided buffers unchanged.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
