CVE-2018-1057: s4:dsdb/acl: run password checking only once

[Samba.git] / WHATSNEW.txt

                   =============================
                   Release Notes for Samba 4.7.5
                          February 7, 2018
                   =============================


This is the latest stable release of the Samba 4.7 release series.

Major enhancements include:

o  BUG 13228: This is a major issue in Samba's ActiveDirectory domain
   controller code. It might happen that AD objects have missing or broken
   linked attributes. This could lead to broken group memberships e.g.
   All Samba AD domain controllers set up with Samba 4.6 or lower and then
   upgraded to 4.7 are affected. The corrupt database can be fixed with
   'samba-tool dbcheck --cross-ncs --fix'.


Changes since 4.7.4:
--------------------

o  Jeremy Allison <jra@samba.org>
   * BUG 13193: smbd tries to release not leased oplock during oplock II
     downgrade.

o  Ralph Boehme <slow@samba.org>
   * BUG 13181: Fix copying file with empty FinderInfo from Windows client
     to Samba share with fruit.

o  Günther Deschner <gd@samba.org>
   * BUG 10976: build: Deal with recent glibc sunrpc header removal.
   * BUG 13238: Make Samba work with tirpc and libnsl2.

o  David Disseldorp <ddiss@samba.org>
   * BUG 13208: vfs_ceph: Add fs_capabilities hook to avoid local statvfs.

o  Love Hornquist Astrand <lha@h5l.org>
   * BUG 12986: Kerberos: PKINIT: Can't decode algorithm parameters in
     clientPublicValue.

o  Amitay Isaacs <amitay@gmail.com>
   * BUG 13188: ctdb-recovery-helper: Deregister message handler in error
     paths.

o  Volker Lendecke <vl@samba.org>
   * BUG 13240: samba: Only use async signal-safe functions in signal handler.

o  Stefan Metzmacher <metze@samba.org>
   * BUG 12986: Kerberos: PKINIT: Can't decode algorithm parameters in
     clientPublicValue.
   * BUG 13228: repl_meta_data: Fix linked attribute corruption on databases
     with unsorted links on expunge. dbcheck: Add functionality to fix the
     corrupt database.

o  Christof Schmitt <cs@samba.org>
   * BUG 13189: Fix smbd panic when chdir returns error during exit.

o  Andreas Schneider <asn@samba.org>
   * BUG 13238: Make Samba work with tirpc and libnsl2.

o  Uri Simchoni <uri@samba.org>
   * BUG 13176: Fix POSIX ACL support on HPUX and possibly other big-endian OSs.


#######################################
Reporting bugs & Development Discussion
#######################################

Please discuss this release on the samba-technical mailing list or by
joining the #samba-technical IRC channel on irc.freenode.net.

If you do report problems then please try to send high quality
feedback. If you don't provide vital information to help us track down
the problem then you will probably be ignored.  All bug reports should
be filed under the "Samba 4.1 and newer" product in the project's Bugzilla
database (https://bugzilla.samba.org/).


======================================================================
== Our Code, Our Bugs, Our Responsibility.
== The Samba Team
======================================================================


Release notes for older releases follow:
----------------------------------------

                   =============================
                   Release Notes for Samba 4.7.4
                          December 22, 2017
                   =============================


This is the latest stable release of the Samba 4.7 release series.


smbclient reparse point symlink parameters reversed
===================================================

A bug in smbclient caused the 'symlink' command to reverse the
meaning of the new name and link target parameters when creating a
reparse point symlink against a Windows server.

This only affects using the smbclient 'symlink' command against
a Windows server, not a Samba server using the UNIX extensions
(the parameter order is correct in that case) so no existing
user scripts that depend on creating symlinks on Samba servers
need to change.

As this is a little used feature the ordering of these parameters
has been reversed to match the parameter ordering of the UNIX
extensions 'symlink' command. This means running 'symlink' against
both Windows and Samba now uses the same paramter ordering in both
cases.

The usage message for this command has also been improved to remove confusion.


Changes since 4.7.3:
--------------------

o  Jeremy Allison <jra@samba.org>
   * BUG 13140: s3: smbclient: Implement 'volume' command over SMB2.
   * BUG 13171: s3: libsmb: Fix valgrind read-after-free error in
     cli_smb2_close_fnum_recv().
   * BUG 13172: s3: libsmb: Fix reversing of oldname/newname paths when creating
     a reparse point symlink on Windows from smbclient.

o  Timur I. Bakeyev <timur@iXsystems.com>
   * BUG 12934: Build man page for vfs_zfsacl.8 with Samba.

o  Andrew Bartlett <abartlet@samba.org>
   * BUG 13095: repl_meta_data: Allow delete of an object with dangling
     backlinks.
   * BUG 13129: s4:samba: Fix default to be running samba as a deamon.
   * BUG 13191: Performance regression in DNS server with introduction of
     DNS wildcard, ldb: Release 1.2.3

o  Ralph Boehme <slow@samba.org>
   * BUG 6133: vfs_zfsacl: Fix compilation error.
   * BUG 13051: "smb encrypt" setting changes are not fully applied until full
     smbd restart.
   * BUG 13052: winbindd: Fix idmap_rid dependency on trusted domain list.
   * BUG 13155: vfs_fruit: Proper VFS-stackable conversion of FinderInfo.
   * BUG 13173: winbindd: Dependency on trusted-domain list in winbindd in
     critical auth codepath.

o  Andrej Gessel <Andrej.Gessel@janztec.com>
   * BUG 13120: repl_meta_data: Fix removing of backlink on deleted objects.

o  Amitay Isaacs <amitay@gmail.com>
   "* BUG 13153: ctdb: sock_daemon leaks memory.
   * BUG 13154: TCP tickles not getting synchronised on CTDB restart.

o  Volker Lendecke <vl@samba.org>
   * BUG 13150: winbindd: winbind parent and child share a ctdb connection.
   * BUG 13170: pthreadpool: Fix deadlock.
   * BUG 13179: pthreadpool: Fix starvation after fork.
   * BUG 13180: messaging: Always register the unique id.

o  Gary Lockyer <gary@catalyst.net.nz>
   * 13129: s4/smbd: set the process group.

o  Stefan Metzmacher <metze@samba.org>
   * BUG 13095: Fix broken linked attribute handling.
   * BUG 13132: The KDC on an RWDC doesn't send error replies in some
     situations.
   * BUG 13149: libnet_join: Fix 'net rpc oldjoin'.
   * BUG 13195: g_lock conflict detection broken when processing stale entries.
   * BUG 13197: s3:smb2_server: allow logoff, close, unlock, cancel and echo
     on expired sessions.

o  Noel Power <noel.power@suse.com>
   * BUG 13166: s3:libads: net ads keytab list fails with "Key table name
     malformed".

o  Christof Schmitt <cs@samba.org>
   * BUG 13170: Fix crash in pthreadpool thread after failure from pthread_create.

o  Andreas Schneider <asn@samba.org>
   * BUG 13129: s4:samba: Allow samba daemon to run in foreground.
   * BUG 13174: third_party: Link the aesni-intel library with "-z noexecstack".

o  Niels de Vos <ndevos@redhat.com>
   * BUG 13125: vfs_glusterfs: include glusterfs/api/glfs.h without relying on
     "-I" options.


#######################################
Reporting bugs & Development Discussion
#######################################

Please discuss this release on the samba-technical mailing list or by
joining the #samba-technical IRC channel on irc.freenode.net.

If you do report problems then please try to send high quality
feedback. If you don't provide vital information to help us track down
the problem then you will probably be ignored.  All bug reports should
be filed under the "Samba 4.1 and newer" product in the project's Bugzilla
database (https://bugzilla.samba.org/).


======================================================================
== Our Code, Our Bugs, Our Responsibility.
== The Samba Team
======================================================================


----------------------------------------------------------------------


                   =============================
                   Release Notes for Samba 4.7.3
                         November 21, 2017
                   =============================


This is a security release in order to address the following defects:

o  CVE-2017-14746 (Use-after-free vulnerability.)
o  CVE-2017-15275 (Server heap memory information leak.)


=======
Details
=======

o  CVE-2017-14746:
   All versions of Samba from 4.0.0 onwards are vulnerable to a use after
   free vulnerability, where a malicious SMB1 request can be used to
   control the contents of heap memory via a deallocated heap pointer. It
   is possible this may be used to compromise the SMB server.

o  CVE-2017-15275:
   All versions of Samba from 3.6.0 onwards are vulnerable to a heap
   memory information leak, where server allocated heap memory may be
   returned to the client without being cleared.

   There is no known vulnerability associated with this error, but
   uncleared heap memory may contain previously used data that may help
   an attacker compromise the server via other methods. Uncleared heap
   memory may potentially contain password hashes or other high-value
   data.

For more details and workarounds, please see the security advisories:

   o https://www.samba.org/samba/security/CVE-2017-14746.html
   o https://www.samba.org/samba/security/CVE-2017-15275.html


Changes since 4.7.2:
--------------------

o  Jeremy Allison <jra@samba.org>
   * BUG 13041: CVE-2017-14746: s3: smbd: Fix SMB1 use-after-free crash bug.
   * BUG 13077: CVE-2017-15275: s3: smbd: Chain code can return uninitialized
     memory when talloc buffer is grown.


#######################################
Reporting bugs & Development Discussion
#######################################

Please discuss this release on the samba-technical mailing list or by
joining the #samba-technical IRC channel on irc.freenode.net.

If you do report problems then please try to send high quality
feedback. If you don't provide vital information to help us track down
the problem then you will probably be ignored.  All bug reports should
be filed under the "Samba 4.1 and newer" product in the project's Bugzilla
database (https://bugzilla.samba.org/).


======================================================================
== Our Code, Our Bugs, Our Responsibility.
== The Samba Team
======================================================================


----------------------------------------------------------------------


                   =============================
                   Release Notes for Samba 4.7.2
                         November 15, 2017
                   =============================


This is an additional bugfix release to address a possible data corruption
issue. Please update immediately! For details, please see

  https://bugzilla.samba.org/show_bug.cgi?id=13130

Samba 4.6.0 and newer is affected by this issue.


Changes since 4.7.1:
--------------------

o  Jeremy Allison <jra@samba.org>
   * BUG 13121: Non-smbd processes using kernel oplocks can hang smbd.

o  Joe Guo <joeg@catalyst.net.nz>
   * BUG 13127: python: use communicate to fix Popen deadlock.

o  Volker Lendecke <vl@samba.org>
   * BUG 13130: smbd on disk file corruption bug under heavy threaded load.

o  Stefan Metzmacher <metze@samba.org>
   * BUG 13130: tevent: version 0.9.34.

o  Ralph Wuerthner <ralph.wuerthner@de.ibm.com>
   * BUG 13118: s3: smbd: Fix delete-on-close after smb2_find.


#######################################
Reporting bugs & Development Discussion
#######################################

Please discuss this release on the samba-technical mailing list or by
joining the #samba-technical IRC channel on irc.freenode.net.

If you do report problems then please try to send high quality
feedback. If you don't provide vital information to help us track down
the problem then you will probably be ignored.  All bug reports should
be filed under the "Samba 4.1 and newer" product in the project's Bugzilla
database (https://bugzilla.samba.org/).


======================================================================
== Our Code, Our Bugs, Our Responsibility.
== The Samba Team
======================================================================


----------------------------------------------------------------------


                   =============================
                   Release Notes for Samba 4.7.1
                         November 02, 2017
                   =============================


This is the latest stable release of the Samba 4.7 release series.


Changes since 4.7.0:
--------------------

o  Michael Adam <obnox@samba.org>
   * BUG 13091: vfs_glusterfs: Fix exporting subdirs with shadow_copy2.

o  Jeremy Allison <jra@samba.org>
   * BUG 13027: s3: smbd: Currently if getwd() fails after a chdir(), we panic.
   * BUG 13068: s3: VFS: Ensure default SMB_VFS_GETWD() call can't return a
     partially completed struct smb_filename.
   * BUG 13069: sys_getwd() can leak memory or possibly return the wrong errno
     on older systems.
   * BUG 13093: 'smbclient' doesn't correctly canonicalize all local names
     before use.

o  Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
   * BUG 13095: Fix broken linked attribute handling.

o  Andrew Bartlett <abartlet@samba.org>
   * BUG 12994: Missing LDAP query escapes in DNS rpc server.
   * BUG 13087: replace: Link to -lbsd when building replace.c by hand.

o  Ralph Boehme <slow@samba.org>
   * BUG 6133: Cannot delete non-ACL files on Solaris/ZFS/NFSv4 ACL filesystem.
   * BUG 7909: Map SYNCHRONIZE acl permission statically in zfs_acl vfs module.
   * BUG 7933: Samba fails to honor SEC_STD_WRITE_OWNER bit with the
     acl_xattr module.
   * BUG 12991: s3/mdssvc: Missing assignment in sl_pack_float.
   * BUG 12995: Wrong Samba access checks when changing DOS attributes.
   * BUG 13062: samba_runcmd_send() leaves zombie processes on timeout
   * BUG 13065: net: groupmap cleanup should not delete BUILTIN mappings.
   * BUG 13076: Enabling vfs_fruit results in loss of Finder tags and other
     xattrs.

o  Alexander Bokovoy <ab@samba.org>
   * BUG 9613: man pages: Properly ident lists.
   * BUG 13081: smb.conf.5: Sort parameters alphabetically.

o  Samuel Cabrero <scabrero@suse.de>
   * BUG 12993: s3: spoolss: Fix GUID string format on GetPrinter info.

o  Amitay Isaacs <amitay@gmail.com>
   * BUG 13042: Remote serverid check doesn't check for the unique id.
   * BUG 13056: CTDB starts consuming memory if there are dead nodes in the
     cluster.
   * BUG 13070: ctdb-common: Ignore event scripts with multiple '.'s.

o  Lutz Justen <ljusten@google.com>
   * BUG 13046: libgpo doesn't sort the GPOs in the correct order.

o  Volker Lendecke <vl@samba.org>
   * BUG 13042: Remote serverid check doesn't check for the unique id.
   * BUG 13090: vfs_catia: Fix a potential memleak.
   * BUG 12903: Fix file change notification for renames.

o  Gary Lockyer <gary@catalyst.net.nz>
   * BUG 12952: Samba DNS server does not honour wildcards.

o  Stefan Metzmacher <metze@samba.org>
   * BUG 13079:  Can't change password in samba from a Windows client if Samba
     runs on IPv6 only interface.

o  Anoop C S <anoopcs@redhat.com>
   * BUG 13086: vfs_fruit: Replace closedir() by SMB_VFS_CLOSEDIR.

o  Christof Schmitt <cs@samba.org>
   * BUG 13047: Apple client can't cope with SMB2 async replies when creating
     symlinks.

o  Andreas Schneider <asn@samba.org>
   * BUG 12959: s4:rpc_server:backupkey: Move variable into scope.
   * BUG 13099: s4:scripting: Fix ntstatus_gen.h generation on 32bit.
   * BUG 13100: s3:vfs_glusterfs: Fix a double free in vfs_gluster_getwd().
   * BUG 13101: Fix resouce leaks and pointer issues.

o  Jorge Schrauwen
   * BUG 13049: vfs_solarisacl: Fix build for samba 4.7 and up.


#######################################
Reporting bugs & Development Discussion
#######################################

Please discuss this release on the samba-technical mailing list or by
joining the #samba-technical IRC channel on irc.freenode.net.

If you do report problems then please try to send high quality
feedback. If you don't provide vital information to help us track down
the problem then you will probably be ignored.  All bug reports should
be filed under the "Samba 4.1 and newer" product in the project's Bugzilla
database (https://bugzilla.samba.org/).


======================================================================
== Our Code, Our Bugs, Our Responsibility.
== The Samba Team
======================================================================


----------------------------------------------------------------------


                   =============================
                   Release Notes for Samba 4.7.0
                        September 20, 2017
                   =============================


This is the first stable release of Samba 4.7.
Please read the release notes carefully before upgrading.

UPGRADING
=========

'smbclient' changes
------------------

'smbclient' no longer prints a 'Domain=[...] OS=[Windows 6.1] Server=[...]'
banner when connecting to the first server. With SMB2 and Kerberos,
there's no way to print this information reliably. Now we avoid it at all
consistently. In interactive sessions the following banner is now presented
to the user: 'Try "help" do get a list of possible commands.'.

The default for "client max protocol" has changed to "SMB3_11",
which means that 'smbclient' (and related commands) will work against
servers without SMB1 support.

It's possible to use the '-m/--max-protocol' option to overwrite
the "client max protocol" option temporarily.

Note that the '-e/--encrypt' option also works with most SMB3 servers
(e.g. Windows >= 2012 and Samba >= 4.0.0), so the SMB1 unix extensions
are not required for encryption.

The change to SMB3_11 as default also means 'smbclient' no longer
negotiates SMB1 unix extensions by default, when talking to a Samba server with
"unix extensions = yes".  As a result, some commands are not available, e.g.
'posix_encrypt', 'posix_open', 'posix_mkdir', 'posix_rmdir', 'posix_unlink',
'posix_whoami', 'getfacl' and 'symlink'. Using "-mNT1" reenables them, if the
server supports SMB1.

Note the default ("CORE") for "client min protocol" hasn't changed,
so it's still possible to connect to SMB1-only servers by default.

'smbclient' learned a new command 'deltree' that is able to do
a recursive deletion of a directory tree.


NEW FEATURES/CHANGES
====================

Whole DB read locks: Improved LDAP and replication consistency
--------------------------------------------------------------

Prior to Samba 4.7 and ldb 1.2.0, the LDB database layer used by Samba
erroneously did not take whole-DB read locks to protect search
and DRS replication operations.

While each object returned remained subject to a record-level lock (so
would remain consistent to itself), under a race condition with a
rename or delete, it and any links (like the member attribute) to it
would not be returned.

The symptoms of this issue include:

Replication failures with this error showing in the client side logs:
 error during DRS repl ADD: No objectClass found in replPropertyMetaData for
 Failed to commit objects:
 WERR_GEN_FAILURE/NT_STATUS_INVALID_NETWORK_RESPONSE

A crash of the server, in particular the rpc_server process with
 INTERNAL ERROR: Signal 11

LDAP read inconsistency
 A DN subject to a search at the same time as it is being renamed
 may not appear under either the old or new name, but will re-appear
 for a subsequent search.

See https://bugzilla.samba.org/show_bug.cgi?id=12858 for more details
and updated advise on database recovery for affected installations.

Samba AD with MIT Kerberos
--------------------------

After four years of development, Samba finally supports compiling and
running Samba AD with MIT Kerberos. You can enable it with:

    ./configure --with-system-mitkrb5

Samba requires version 1.15.1 of MIT Kerberos to build with AD DC support.
The krb5-devel and krb5-server packages are required.
The feature set is not on par with the Heimdal build but the most important
things, like forest and external trusts, are working. Samba uses the KDC binary
provided by MIT Kerberos.

Missing features, compared to Heimdal, are:
  * PKINIT support
  * S4U2SELF/S4U2PROXY support
  * RODC support (not fully working with Heimdal either)

The Samba AD process will take care of starting the MIT KDC and it will load a
KDB (Kerberos Database) driver to access the Samba AD database.  When
provisioning an AD DC using 'samba-tool' it will take care of creating a correct
kdc.conf file for the MIT KDC.

For further details, see:
https://wiki.samba.org/index.php/Running_a_Samba_AD_DC_with_MIT_Kerberos_KDC

Dynamic RPC port range
----------------------

The dynamic port range for RPC services has been changed from the old default
value "1024-1300" to "49152-65535". This port range is not only used by a
Samba AD DC, but also applies to all other server roles including NT4-style
domain controllers. The new value has been defined by Microsoft in Windows
Server 2008 and newer versions. To make it easier for Administrators to control
those port ranges we use the same default and make it configurable with the
option: "rpc server dynamic port range".

The "rpc server port" option sets the first available port from the new
"rpc server dynamic port range" option. The option "rpc server port" only
applies to Samba provisioned as an AD DC.

Authentication and Authorization audit support
----------------------------------------------

Detailed authentication and authorization audit information is now
logged to Samba's debug logs under the "auth_audit" debug class,
including in particular the client IP address triggering the audit
line.  Additionally, if Samba is compiled against the jansson JSON
library, a JSON representation is logged under the "auth_json_audit"
debug class.

Audit support is comprehensive for all authentication and
authorisation of user accounts in the Samba Active Directory Domain
Controller, as well as the implicit authentication in password
changes.  In the file server and classic/NT4 domain controller, NTLM
authentication, SMB and RPC authorization is covered, however password
changes are not at this stage, and this support is not currently
backed by a testsuite.

For further details, see:
https://wiki.samba.org/index.php/Setting_up_Audit_Logging

Multi-process LDAP Server
-------------------------

The LDAP server in the AD DC now honours the process model used for
the rest of the 'samba' process, rather than being forced into a single
process.  This aids in Samba's ability to scale to larger numbers of AD
clients and the AD DC's overall resiliency, but will mean that there is a
fork()ed child for every LDAP client, which may be more resource
intensive in some situations.  If you run Samba in a
resource-constrained VM, consider allocating more RAM and swap space.

Improved Read-Only Domain Controller (RODC) Support
---------------------------------------------------

Support for RODCs in Samba AD until now has been experimental. With this latest
version, many of the critical bugs have been fixed and the RODC can be used in
DC environments requiring no writable behaviour. RODCs now correctly support
bad password lockouts and password disclosure auditing through the
msDS-RevealedUsers attribute.

The fixes made to the RWDC will also allow Windows RODC to function more
correctly and to avoid strange data omissions such as failures to replicate
groups or updated passwords. Password changes are currently rejected at the
RODC, although referrals should be given over LDAP. While any bad passwords can
trigger domain-wide lockout, good passwords which have not been replicated yet
for a password change can only be used via NTLM on the RODC (and not Kerberos).

The reliability of RODCs locating a writable partner still requires some
improvements and so the 'password server' configuration option is generally
recommended on the RODC.

Samba 4.7 is the first Samba release to be secure as an RODC or when
hosting an RODC.  If you have been using earlier Samba versions to
host or be an RODC, please upgrade.

In particular see https://bugzilla.samba.org/show_bug.cgi?id=12977 for
details on the security implications for password disclosure to an
RODC using earlier versions.

Additional password hashes stored in supplementalCredentials
------------------------------------------------------------

A new config option 'password hash userPassword schemes' has been added to
enable generation of SHA-256 and SHA-512 hashes (without storing the plaintext
password with reversible encryption). This builds upon previous work to improve
password sync for the AD DC (originally using GPG).

The user command of 'samba-tool' has been updated in order to be able to
extract these additional hashes, as well as extracting the (HTTP) WDigest
hashes that we had also been storing in supplementalCredentials.

Improvements to DNS during Active Directory domain join
-------------------------------------------------------

The 'samba-tool' domain join command will now add the A and GUID DNS records
(on both the local and remote servers) during a join if possible via RPC. This
should allow replication to proceed more smoothly post-join.

The mname element of the SOA record will now also be dynamically generated to
point to the local read-write server. 'samba_dnsupdate' should now be more
reliable as it will now find the appropriate name server even when resolv.conf
points to a forwarder.

Significant AD performance and replication improvements
-------------------------------------------------------

Previously, replication of group memberships was been an incredibly expensive
process for the AD DC. This was mostly due to unnecessary CPU time being spent
parsing member linked attributes. The database now stores these linked
attributes in sorted form to perform efficient searches for existing members.
In domains with a large number of group memberships, a join can now be
completed in half the time compared with Samba 4.6.

LDAP search performance has also improved, particularly in the unindexed search
case. Parsing and processing of security descriptors should now be more
efficient, improving replication but also overall performance.

Query record for open file or directory
---------------------------------------

The record attached to an open file or directory in Samba can be
queried through the 'net tdb locking' command. In clustered Samba this
can be useful to determine the file or directory triggering
corresponding "hot" record warnings in ctdb.

Removal of lpcfg_register_defaults_hook()
-----------------------------------------

The undocumented and unsupported function lpcfg_register_defaults_hook()
that was used by external projects to call into Samba and modify
smb.conf default parameter settings has been removed. If your project
was using this call please raise the issue on
samba-technical@lists.samba.org in order to design a supported
way of obtaining the same functionality.

Change of loadable module interface
-----------------------------------

The _init function of all loadable modules in Samba has changed
from:

NTSTATUS _init(void);

to:

NTSTATUS _init(TALLOC_CTX *);

This allows a program loading a module to pass in a long-lived
talloc context (which must be guaranteed to be alive for the
lifetime of the module). This allows modules to avoid use of
the talloc_autofree_context() (which is inherently thread-unsafe)
and still be valgrind-clean on exit. Modules that don't need to
free long-lived data on exit should use the NULL talloc context.

SHA256 LDAPS Certificates
-------------------------

The self-signed certificate generated for use on LDAPS will now be
generated with a SHA256 self-signature, not a SHA1 self-signature.

Replacing this certificate with a certificate signed by a trusted
CA is still highly recommended.

CTDB changes
------------

* CTDB no longer allows mixed minor versions in a cluster

  See the AllowMixedVersions tunable option in ctdb-tunables(7) and also
  https://wiki.samba.org/index.php/Upgrading_a_CTDB_cluster#Policy

* CTDB now ignores hints from Samba about TDB flags when attaching to databases

  CTDB will use the correct flags depending on the type of database.
  For clustered databases, the smb.conf setting
  dbwrap_tdb_mutexes:*=true will be ignored. Instead, CTDB continues
  to use the TDBMutexEnabled tunable.

* New configuration variable CTDB_NFS_CHECKS_DIR

  See ctdbd.conf(5) for more details.

* The CTDB_SERVICE_AUTOSTARTSTOP configuration variable has been
  removed

  To continue to manage/unmanage services while CTDB is running:

  - Start service by hand and then flag it as managed

  - Mark service as unmanaged and shut it down by hand

  - In some cases CTDB does something fancy - e.g. start Samba under
    "nice", so care is needed. One technique is to disable the
    eventscript, mark as managed, run the startup event by hand and then
    re-enable the eventscript.

* The CTDB_SCRIPT_DEBUGLEVEL configuration variable has been removed

* The example NFS Ganesha call-out has been improved

* A new "replicated" database type is available

  Replicated databases are intended for CTDB's internal use to
  replicate state data across the cluster, but may find other
  uses. The data in replicated databases is valid for the lifetime of
  CTDB and cleared on first attach.

Using x86_64 Accelerated AES Crypto Instructions
------------------------------------------------

Samba on x86_64 can now be configured to use the Intel accelerated AES
instruction set, which has the potential to make SMB3 signing and
encryption much faster on client and server. To enable this, configure
Samba using the new option --accel-aes=intelaesni.

This is a temporary solution that is being included to allow users
to enjoy the benefits of Intel accelerated AES on the x86_64 platform,
but the longer-term solution will be to move Samba to a fully supported
external crypto library.

The third_party/aesni-intel code will be removed from Samba as soon as
external crypto library performance reaches parity.

The default is to build without setting --accel-aes, which uses the
existing Samba software AES implementation.

Parameter changes
-----------------

The "strict sync" global parameter has been changed from
a default of "no" to "yes". This means smbd will by default
obey client requests to synchronize unwritten data in operating
system buffers safely onto disk. This is a safer default setting
for modern SMB1/2/3 clients.

The 'ntlm auth' option default is renamed to 'ntlmv2-only', reflecting
the previous behaviour.  Two new values have been provided,
'mschapv2-and-ntlmv2-only' (allowing MSCHAPv2 while denying NTLMv1)
and 'disabled', totally disabling NTLM authentication and password
changes.

smb.conf changes
================

  Parameter Name                     Description             Default
  --------------                     -----------             -------
  allow unsafe cluster upgrade       New parameter           no
  auth event notification            New parameter           no
  auth methods                       Deprecated
  client max protocol                Effective               SMB3_11
                                     default changed
  map untrusted to domain            New value/              auto
                                     Default changed/
                                     Deprecated
  mit kdc command                    New parameter
  profile acls                       Deprecated
  rpc server dynamic port range      New parameter           49152-65535
  strict sync                        Default changed         yes
  password hash userPassword schemes New parameter
  ntlm auth                          New values              ntlmv2-only


KNOWN ISSUES
============

https://wiki.samba.org/inFdex.php/Release_Planning_for_Samba_4.7#Release_blocking_bugs


CHANGES SINCE 4.7.0rc6
======================

o  CVE-2017-12150:
   A man in the middle attack may hijack client connections.

o  CVE-2017-12151:
   A man in the middle attack can read and may alter confidential
   documents transferred via a client connection, which are reached
   via DFS redirect when the original connection used SMB3.

o  CVE-2017-12163:
   Client with write access to a share can cause server memory contents to be
   written into a file or printer.


CHANGES SINCE 4.7.0rc5
======================

o  Jeremy Allison <jra@samba.org>
   * BUG 13003: s3: vfs: catia: compression get/set must act only on base file, and
     must cope with fsp==NULL.
   * BUG 13008: lib: crypto: Make smbd use the Intel AES instruction set for signing
     and encryption.

o  Andrew Bartlett <abartlet@samba.org>
   * BUG 12946: s4-drsuapi: Avoid segfault when replicating as a non-admin with
     GUID_DRS_GET_CHANGES.
   * BUG 13015: Allow re-index of newer databases with binary GUID TDB keys
     (this officially removes support for re-index of the original pack format 0,
     rather than simply segfaulting).
   * BUG 13017: Add ldb_ldif_message_redacted_string() to allow debug of redacted
     log messages, avoiding showing secret values.
   * BUG 13023: ldb: version 1.2.2.
   * BUG 13025: schema: Rework dsdb_schema_set_indices_and_attributes() db
     operations.

o  Alexander Bokovoy <ab@samba.org>
   * BUG 13030: Install dcerpc/__init__.py for all Python environments.

o  Ralph Boehme <slow@samba.org>
   * BUG 13024: s3/smbd: Sticky write time offset miscalculation causes broken
     timestamps
   * BUG 13037: lib/util: Only close the event_fd in tfork if the caller didn't
     call tfork_event_fd().

o  Volker Lendecke <vl@samba.org>
   * BUG 13006: messaging: Avoid a socket leak after fork.

o  Stefan Metzmacher <metze@samba.org>
   * BUG 13018: charset: Fix str[n]casecmp_m() by comparing lower case values.

o  Gary Lockyer <gary@catalyst.net.nz>
   * BUG 13037: util_runcmd: Free the fde in event handler.

o  Amitay Isaacs <amitay@gmail.com>
   * BUG 13012: ctdb-daemon: Fix implementation of process_exists control.
   * BUG 13021: GET_DB_SEQNUM control can cause ctdb to deadlock when databases
     are frozen.
   * BUG 13029: ctdb-daemon: Free up record data if a call request is deferred.
   * BUG 13036: ctdb-client: Initialize ctdb_ltdb_header completely for empty
     record.

o  Christof Schmitt <cs@samba.org>
   * BUG 13032: vfs_streams_xattr: Fix segfault when running with log level 10.


CHANGES SINCE 4.7.0rc4
======================

o  Andrew Bartlett <abartlet@samba.org>
   * BUG 12929: smb.conf: Explain that "ntlm auth" is a per-passdb setting.
   * BUG 12953: s4/lib/tls: Use SHA256 to sign the TLS certificates.

o  Jeremy Allison <jra@samba.org>
   * BUG 12932: Get rid of talloc_autofree_context().

o  Amitay Isaacs <amitay@gmail.com>
   * BUG 12978: After restarting CTDB, it attaches replicated databases with
     wrong flags.

o  Stefan Metzmacher <metze@samba.org>
   * BUG 12863: s3:smbclient: Don't try any workgroup listing with
     "client min protocol = SMB2".
   * BUG 12876: s3:libsmb: Don't call cli_NetServerEnum() on SMB2/3 connections
     in SMBC_opendir_ctx().
   * BUG 12881: s3:libsmb: Let do_connect() debug the negotiation result
     similar to "session request ok".
   * BUG 12919: s4:http/gensec: add missing tevent_req_done() to
     gensec_http_ntlm_update_done().
   * BUG 12968: Fix 'smbclient tarmode' with SMB2/3.
   * BUG 12973: 'smbd': Don't use a lot of CPU on startup of a connection.

o  Christof Schmitt <cs@samba.org>
   * BUG 12983: vfs_default: Fix passing of errno from async calls.

o  Andreas Schneider <asn@samba.org>
   * BUG 12629: s3:utils: Do not report an invalid range for AD DC role.
   * BUG 12704: s3:libsmb: Let get_ipc_connect() use
     CLI_FULL_CONNECTION_FORCE_SMB1.
   * BUG 12930: Fix build issues with GCC 7.1.
   * BUG 12950: s3:script: Untaint user supplied data in modprinter.pl.
   * BUG 12956: s3:libads: Fix changing passwords with Kerberos.
   * BUG 12975: Fix changing the password with 'smbpasswd' as a local user on
     a domain member.


CHANGES SINCE 4.7.0rc3
======================

o  Jeremy Allison <jra@samba.org>
   * BUG 12913: Implement cli_smb2_setatr() by calling cli_smb2_setpathinfo().

o  Andrew Bartlett <abartlet@samba.org>
   * BUG 11392: s4-cldap/netlogon: Match Windows 2012R2 and return
     NETLOGON_NT_VERSION_5 when version unspecified.
   * BUG 12855: dsdb: Do not force a re-index of sam.ldb on upgrade to 4.7.
   * BUG 12904: dsdb: Fix dsdb_next_callback to correctly use ldb_module_done()
     etc.
   * BUG 12939: s4-rpc_server: Improve debug of new endpoints.

o  Ralph Boehme <slow@samba.org>
   * BUG 12791: Fix kernel oplocks issues with named streams.
   * BUG 12944: vfs_gpfs: Handle EACCES when fetching DOS attributes from xattr.

o  Bob Campbell <bobcampbell@catalyst.net.nz>
   * BUG 12842: samdb/cracknames: Support user and service principal as desired
     format.

o  David Disseldorp <ddiss@samba.org>
   * BUG 12911: vfs_ceph: Fix cephwrap_chdir().

o  Gary Lockyer <gary@catalyst.net.nz>
   * BUG 12865: Track machine account ServerAuthenticate3.

o  Marc Muehlfeld <mmuehlfeld@samba.org>
   * BUG 12947: python: Fix incorrect kdc.conf parameter name in kerberos.py.

o  Noel Power <noel.power@suse.com>
   * BUG 12937: s3/utils: 'smbcacls' failed to detect DIRECTORIES using SMB2
     (Windows only).

o  Arvid Requate <requate@univention.de>
   * BUG 11392: s4-dsdb/netlogon: Allow missing ntver in cldap ping.

o  Anoop C S <anoopcs@redhat.com>
   * BUG 12936: source3/client: Fix typo in help message displayed by default.

o  Andreas Schneider <asn@samba.org>
   * BUG 12930: Fix building with GCC 7.1.1.


CHANGES SINCE 4.7.0rc2
======================

o  Jeremy Allison <jra@samba.org>
   * BUG 12836: s3: smbd: Fix a read after free if a chained SMB1 call goes
     async.
   * BUG 12899: s3: libsmb: Reverse sense of 'clear all attributes', ignore
     attribute change in SMB2 to match SMB1.
   * BUG 12914: s3: smbclient: Add new command deltree.

o  Ralph Boehme <slow@samba.org>
   * BUG 12885: s3/smbd: Let non_widelink_open() chdir() to directories
     directly.
   * BUG 12887: Remove SMB_VFS_STRICT_UNLOCK noop from the VFS.
   * BUG 12891: Enable TDB mutexes in dbwrap and ctdb.
   * BUG 12897: vfs_fruit: don't use MS NFS ACEs with Windows clients.
   * BUG 12910: s3/notifyd: Ensure notifyd doesn't return from
     smbd_notifyd_init.

o  Alexander Bokovoy <ab@samba.org>
   * BUG 12905: Build py3 versions of other rpc modules.

o  Günther Deschner <gd@samba.org>
   * BUG 12840: vfs_fruit: Add "fruit:model = <modelname>" parametric option.

o  Dustin L. Howett
   * BUG 12720: idmap_ad: Retry query_user exactly once if we get
     TLDAP_SERVER_DOWN.

o  Amitay Isaacs <amitay@gmail.com>
   * BUG 12891: dbwrap_ctdb: Fix calculation of persistent flag.

o  Thomas Jarosch <thomas.jarosch@intra2net.com>
   * BUG 12927: s3: libsmb: Fix use-after-free when accessing pointer *p.

o  Volker Lendecke <vl@samba.org>
   * BUG 12925: smbd: Fix a connection run-down race condition.

o  Stefan Metzmacher <metze@samba.org>
   * tevent: version 0.9.33: make tevent_req_print() more robust against crashes.
   * ldb: version 1.2.1
   * BUG 12882: Do not install _ldb_text.py if we have system libldb.
   * BUG 12890: s3:smbd: consistently use talloc_tos() memory for
     rpc_pipe_open_interface().
   * BUG 12900: Fix index out of bound in ldb_msg_find_common_values.

o  Rowland Penny <rpenny@samba.org>
   * BUG 12884: Easily edit a users object in AD, as if using 'ldbedit'.

o  Bernhard M. Wiedemann <bwiedemann@suse.de>
   * BUG 12906: s3: drop build_env

o  Andreas Schneider <asn@samba.org>
   * BUG 12882: waf: Do not install _ldb_text.py if we have system libldb.

o  Martin Schwenke <martin@meltin.net>
   * BUG 12898: ctdb-common: Set close-on-exec when creating PID file.


CHANGES SINCE 4.7.0rc1
======================

o  Jeffrey Altman <jaltman@secure-endpoints.com>
   * BUG 12894: CVE-2017-11103: Orpheus' Lyre KDC-REP service name validation


#######################################
Reporting bugs & Development Discussion
#######################################

Please discuss this release on the samba-technical mailing list or by
joining the #samba-technical IRC channel on irc.freenode.net.

If you do report problems then please try to send high quality
feedback. If you don't provide vital information to help us track down
the problem then you will probably be ignored.  All bug reports should
be filed under the Samba 4.1 and newer product in the project's Bugzilla
database (https://bugzilla.samba.org/).


======================================================================
== Our Code, Our Bugs, Our Responsibility.
== The Samba Team
======================================================================