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A function in tevent environment can span over several context loop iterations.
Every iteration 'unschedules' the current code and a different functions can
access not yet fully initialized structures.
A locking is used to avoid this. In tevent, we use tevent queues as a locking
mechanism. Every function trying to access lock protected data, puts itself to
a queue. The function must remove itself from the queue only after the complete
work is done.
A good coding practise is to lock only the smallest code path and not to use the
locking if not needed.
wb_parent_idmap_setup_send() uses queue "wb_parent_idmap_config_queue" for:
- testing if the setup is ready
- setting up all idmap domains
But "testing if the setup is ready" can be coded as an atomic operation without
needing a lock.
Signed-off-by: Pavel Filipenský <pfilipen@redhat.com>
Reviewed-by: Andreas Schneider <asn@samba.org>
Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Fri Nov 4 10:06:28 UTC 2022 on sn-devel-184
All parent-child communication is based in NDR and dispatched as a local
RPC call.
Signed-off-by: Samuel Cabrero <scabrero@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Thu May 19 18:50:24 UTC 2022 on sn-devel-184
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15046
Signed-off-by: Samuel Cabrero <scabrero@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
The ADS_STRUCT is not allocated using talloc and there are many places
casting this pointer directly so use a typed pointer.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15046
Signed-off-by: Samuel Cabrero <scabrero@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
The domain's private_data pointer is also used to store a ADS_STRUCT,
which is not allocated using talloc and there are many places casting
this pointer directly.
The recently added samba.tests.pam_winbind_setcred was randomly failing
and after debugging it the problem was that kerberos authentication was
failing because the time_offset passed to kerberos_return_pac() was
wrong. This time_offset was retrieved from ads->auth.time_offset, where
the ads pointer was directly casted from domain->private_data but
private_data was pointing to a winbind_internal_pipes struct.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15046
Signed-off-by: Samuel Cabrero <scabrero@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
They will be used later to refresh the tickets.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14979
Signed-off-by: Samuel Cabrero <scabrero@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
The new code uses PING_DC to tell the child to try to go online.
Pair-Programmed-With: Andreas Schneider <asn@samba.org>
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Isaac Boukris <iboukris@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Thu Apr 29 15:49:16 UTC 2021 on sn-devel-184
This is more or less a copy of wb_xids2sids_init_dom_maps_send/recv,
but it's more generic and doesn't imply global state.
It also closes a initialization race by using a tevent_queue to
serialize the calls.
In the next commits we'll replace wb_xids2sids_init_dom_maps_send/recv.
We'll also use the new function in the wb_sids2xids code.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14539
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
The group enumeration backend functions try to allocate an array of
wb_acct_info structs with a number of elements equal to the number of
groups. In domains with a large number of groups this allocation may
fail due to the size of the chunk.
Found while trying to enumerate the groups in a domain with more than
700k groups.
Signed-off-by: Samuel Cabrero <scabrero@suse.de>
Reviewed-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Fix a bug when a child dies when a request is pending in the child. If the
signal handler fires before epoll finds out the other end of the parent-child
socket is closed, we close the socket on our side without taking care of the
pending request. This causes two problems: First, that one pending request
never is replied to properly, and secondly, we might end up with EPOLL_DEL on a
wrong file descriptor. This causes all sorts of trouble if we hit an active
one.
The fix for this problem is not to close the socket in winbind_child_died().
This however stops an idle child that dies hard from being properly cleaned up.
The fix for that is to add the child->monitor_fde that is set pending only when
no child request is active. This way we can remove the close(sock) in the
signal handler.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13309
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
If we have multiple domain children, it's important
that the first idle child takes over the next waiting request.
Before we had the problem that a request could get stuck in the
queue of a busy child, while later requests could get served fine by
other children.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13292
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Fri Feb 23 09:04:23 CET 2018 on sn-devel-144
This way we have an indication of non direct trusts with
SEC_CHAN_NULL.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
As members we only collect names, indexed by sids. This is served
well by just a simple dbwrap_rbt.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
We have too many variables called _creds :-)
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Autobuild-User(master): Volker Lendecke <vl@samba.org>
Autobuild-Date(master): Wed Aug 30 22:44:45 CEST 2017 on sn-devel-144
Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Sat Mar 18 08:59:01 CET 2017 on sn-devel-144
Unfortunately this is a pretty large patch, because many functions
implement this API. The alternative would have been to create a new
backend function, add the new one piece by piece and then remove the
original function.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Uri Simchoni <uri@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
This makes sure we get the same results for getpwnam and getpwent.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Uri Simchoni <uri@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
This avoids a crash inside the tevent epoll backend.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=11141
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Wed May 20 22:16:54 CEST 2015 on sn-devel-104
Signed-off-by: Richard Sharpe <rsharpe@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Wed May 6 07:03:27 CEST 2015 on sn-devel-104
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>
Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Fri Jul 11 18:46:09 CEST 2014 on sn-devel-104
This allows us to operate against the local cache where possible, but
to forward some operations to the read-write DC.
Andrew Bartlett
Change-Id: Idc78ae379a402969381758919fcede17568f094e
Pair-programmed-with: Garming Sam <garming@catalyst.net.nz>
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Signed-off-by: Garming Sam <garming@catalyst.net.nz>
Reviewed-by: Nadezhda Ivanova <nivanova@samba.org>
Change-Id: Iba3913d5a1c7f851b93f37e9beb6dbb20fbf7e55
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
