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When a samba server process dies hard, it has no chance to clean up its entries
in locking.tdb, brlock.tdb, connections.tdb and sessionid.tdb.
For locking.tdb and brlock.tdb Samba is robust by checking every time we read
an entry from the database if the corresponding process still exists. If it
does not exist anymore, the entry is deleted. This is not 100% failsafe though:
On systems with a limited PID space there is a non-zero chance that between the
smbd's death and the fresh access, the PID is recycled by another long-running
process. This renders all files that had been locked by the killed smbd
potentially unusable until the new process also dies.
This patch is supposed to fix the problem the following way: Every process ID
in every database is augmented by a random 64-bit number that is stored in a
serverid.tdb. Whenever we need to check if a process still exists we know its
PID and the 64-bit number. We look up the PID in serverid.tdb and compare the
64-bit number. If it's the same, the process still is a valid smbd holding the
lock. If it is different, a new smbd has taken over.
I believe this is safe against an smbd that has died hard and the PID has been
taken over by a non-samba process. This process would not have registered
itself with a fresh 64-bit number in serverid.tdb, so the old one still exists
in serverid.tdb. We protect against this case by the parent smbd taking care of
deregistering PIDs from serverid.tdb and the fact that serverid.tdb is
CLEAR_IF_FIRST.
CLEAR_IF_FIRST does not work in a cluster, so the automatic cleanup does not
work when all smbds are restarted. For this, "net serverid wipe" has to be run
before smbd starts up. As a convenience, "net serverid wipedbs" also cleans up
sessionid.tdb and connections.tdb.
While there, this also cleans up overloading connections.tdb with all the
process entries just for messaging_send_all().
Volker
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to respond to a read or write."
This reverts commit a6ae7a552f851a399991262377cc0e062e40ac20.
This fixes bug #7222 (All users have full rigths on all shares) (CVE-2010-0728).
(cherry picked from commit 1c9494c76cc9686c61e0966f38528d3318f3176f)
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Ensure we don't use any of the create_options for Samba private
use. Add a new parameter to the VFS_CREATE call (private_flags)
which is only used internally. Renumber NTCREATEX_OPTIONS_PRIVATE_DENY_DOS
and NTCREATEX_OPTIONS_PRIVATE_DENY_FCB to match the S4 code).
Rev. the VFS interface to version 28.
Jeremy.
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Guenther
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In a cluster, this makes a large difference: For r/w traverse, we have to do a
fetch_locked on every record which for most users of connections_forall is just
overkill.
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Guenther
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Jeremy.
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Make calling schannel much easier by removing the need to explicitly open the
database. Let the abstraction do it instead.
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AC_SIGNAL_TYPE is already obsolete in autoconf. C89 requires signal
handlers to return void, only K&R returned int.
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This is a sync wrapper around cli_smb_send/cli_smb_recv. This is a hack to
speed up converting libsmb/ away from cli_send_smb/cli_receive_smb. Some
routines in libsmb/ are only called in one place in smbtorture for example,
where making it async right now is not worth it. With cli_smb_send/cli_smb_recv
in place, pushing the asynchronosity out one level is "just" boilerplate code
that is easy to do should it become necessary.
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Parts of the Samba RPC client and server code misinterpret authenticated
packets.
DCE authenticated packets actually look like this :
+--------------------------+
|header |
| ... frag_len (packet len)|
| ... auth_len |
+--------------------------+
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| Data payload |
... ....
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+--------------------------+
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| auth_pad_len bytes |
+--------------------------+
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| Auth footer |
| auth_pad_len value |
+--------------------------+
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| Auth payload |
| (auth_len bytes long) |
+--------------------------+
That's right. The pad bytes come *before* the footer specifying how many pad
bytes there are. In order to read this you must seek to the end of the packet
and subtract the auth_len (in the packet header) and the auth footer length (a
known value).
The client and server code gets this right (mostly) in 3.0.x -> 3.4.x so long
as the pad alignment is on an 8 byte boundary (there are some special cases in
the code for this).
Tridge discovered there are some (DRS replication) cases where on 64-bit
machines where the pad alignment is on a 16-byte boundary. This breaks the
existing S3 hand-optimized rpc code.
This patch removes all the special cases in client and server code, and allows
the pad alignment for generated packets to be specified by changing a constant
in include/local.h (this doesn't affect received packets, the new code always
handles them correctly whatever pad alignment is used).
This patch also works correctly with rpcclient using sign+seal from
the 3.4.x and 3.3.x builds (testing with 3.0.x and 3.2.x to follow)
so even as a server it should still work with older libsmbclient and
winbindd code.
Jeremy
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Michael
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This is the basis to implement global locks in ctdb without depending on a
shared file system. The initial goal is to make ctdb persistent transactions
deterministic without too many timeouts.
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Volker.
Create widelinks_warning(int snum) to cover the message needed in make_connection.
Jeremy.
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This way we avoid any chance that a configuration reload may turn
back on wide links when unix extensions are enabled.
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broadcast"
metze
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And send replies always via the unicast address of the subnet.
This behavior is off by default (as before)
and can be enabled with "nmbd:bind explicit broadcast = yes".
metze
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ldapsam_alias_memberships() does the same LDAP search twice, triggered
via add_aliases() from create_local_nt_token().
This happens when no domain aliases are used.
metze
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Signed-off-by: Stefan Metzmacher <metze@samba.org>
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Passing NULL as dest_realm for cli_session_setup_spnego() was
always using our own realm (as for a NetBIOS name). Change this
to look for the mapped realm using krb5_get_host_realm() if
the destination machine name is a DNS name (contains a '.').
Could get fancier with DNS name detection (length, etc.) but
this will do for now.
Jeremy.
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respond to a read or write.
Only works on Linux kernels 2.6.26 and above. Grants CAP_KILL capability
to allow Linux threads under different euids to send signals to each other.
Jeremy.
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Can we enable this by default? This would be a change in behaviour, but this
feature is just too cool for everyone to catch up in the apps.
The patch would be
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Uses the winbind ccache to do authentication if asked to do so
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All but one call were pointless, so I think this API should go
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metze
Signed-off-by: Stefan Metzmacher <metze@samba.org>
(cherry picked from commit c992127f8a96c37940a6d298c7c6859c47f83d9b)
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