path: root/WHATSNEW.txt

                   ===============================
                   Release Notes for Samba 4.12.11
                          January 14, 2021
                   ===============================


This is the latest stable release of the Samba 4.12 release series.


Changes since 4.12.10
---------------------

o  Jeremy Allison <jra@samba.org>
   * BUG 14210: libcli: smb2: Never print length if smb2_signing_key_valid()
     fails for crypto blob.
   * BUG 14486: s3: modules: gluster. Fix the error I made in preventing talloc
     leaks from a function.
   * BUG 14515: s3: smbd: Don't overwrite contents of fsp->aio_requests[0] with
     NULL via TALLOC_FREE().
   * BUG 14568: s3: spoolss: Make parameters in call to user_ok_token() match
     all other uses.
   * BUG 14590: s3: smbd: Quiet log messages from usershares for an unknown
     share.

o  Dimitry Andric <dimitry@andric.com>
   * BUG 14605: lib: Avoid declaring zero-length VLAs in various messaging
     functions.

o  Andrew Bartlett <abartlet@samba.org>
   * BUG 14579: Do not create an empty DB when accessing a sam.ldb.

o  Ralph Boehme <slow@samba.org>
   * BUG 14248: samba process does not honor "max log size".
   * BUG 14587: vfs_zfsacl: add missing inherited flag on hidden "magic"
     everyone@ ACE.
   * BUG 14596: vfs_fruit may close wrong backend fd.

o  Günther Deschner <gd@samba.org>
   * BUG 14486: s3-vfs_glusterfs: always disable write-behind translator.

o  Arne Kreddig <arne@kreddig.net>
   * BUG 14606: vfs_virusfilter: Allocate separate memory for config char*.

o  Stefan Metzmacher <metze@samba.org>
   * BUG 14596: vfs_fruit may close wrong backend fd.

o  Anoop C S <anoopcs@samba.org>
   * BUG 14486: manpages/vfs_glusterfs: Mention silent skipping of write-behind
     translator.
   * BUG 14573: vfs_shadow_copy2: Preserve all open flags assuming ROFS.

o  Andreas Schneider <asn@samba.org>
   * BUG 14601: s3:lib: Create the cache path of user gencache recursively.

o  Martin Schwenke <martin@meltin.net>
   * BUG 14594: Be more flexible with repository names in CentOS 8 test
     environments.

o  Jones Syue <jonessyue@qnap.com>
   * BUG 14514: interface: Fix if_index is not parsed correctly.


#######################################
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 4.12.10
                          November 05, 2020
                   ===============================


This is the latest stable release of the Samba 4.12 release series.

Major enhancements include:

  o BUG 14537: ctdb-common: Avoid aliasing errors during code optimization.
  o BUG 14486: vfs_glusterfs: Avoid data corruption with the write-behind
               translator.


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

The GlusterFS write-behind performance translator, when used with Samba, could
be a source of data corruption. The translator, while processing a write call,
immediately returns success but continues writing the data to the server in the
background. This can cause data corruption when two clients relying on Samba to
provide data consistency are operating on the same file.

The write-behind translator is enabled by default on GlusterFS.
The vfs_glusterfs plugin will check for the presence of the translator and
refuse to connect if detected. Please disable the write-behind translator for
the GlusterFS volume to allow the plugin to connect to the volume.


Changes since 4.12.9
--------------------

o  Jeremy Allison <jra@samba.org>
   * BUG 14486: s3: modules: vfs_glusterfs: Fix leak of char
     **lines onto mem_ctx on return.

o  Ralph Boehme <slow@samba.org>
   * BUG 14471: RN: vfs_zfsacl: Only grant DELETE_CHILD if ACL tag is special.

o  Alexander Bokovoy <ab@samba.org>
   * BUG 14538: smb.conf.5: Add clarification how configuration changes
     reflected by Samba.

o  Günther Deschner <gd@samba.org>
   * BUG 14486: s3-vfs_glusterfs: Refuse connection when write-behind xlator is
     present.
   * winexe:: Add configure option to control whether to build it
     (default: auto).

o  Amitay Isaacs <amitay@gmail.com>
   * BUG 14487: Latest version of Bind9 is now 9.20.
   * BUG 14537: ctdb-common: Avoid aliasing errors during code optimization.

o  Stefan Metzmacher <metze@samba.org>
   * BUG 14531: s4:dsdb:acl_read: Implement "List Object" mode feature.

o  Sachin Prabhu <sprabhu@redhat.com>
   * BUG 14486: docs-xml/manpages: Add warning about write-behind translator for
     vfs_glusterfs.

o  Khem Raj <raj.khem@gmail.com>
   * nsswitch/nsstest.c: Avoid nss function conflicts with glibc nss.h.

o  Martin Schwenke <martin@meltin.net>
   * BUG 14513: ctdb disable/enable can still fail due to race condition.

o  Andrew Walker <awalker@ixsystems.com>
   * BUG 14471: RN: vfs_zfsacl: Only grant DELETE_CHILD if ACL tag is special.


#######################################
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 4.12.9
                          October 29, 2020
                   ==============================


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

o CVE-2020-14318: Missing handle permissions check in SMB1/2/3 ChangeNotify.
o CVE-2020-14323: Unprivileged user can crash winbind.
o CVE-2020-14383: An authenticated user can crash the DCE/RPC DNS with easily
		  crafted records.


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

o  CVE-2020-14318:
   The SMB1/2/3 protocols have a concept of "ChangeNotify", where a client can
   request file name notification on a directory handle when a condition such as
   "new file creation" or "file size change" or "file timestamp update" occurs.

   A missing permissions check on a directory handle requesting ChangeNotify
   meant that a client with a directory handle open only for
   FILE_READ_ATTRIBUTES (minimal access rights) could be used to obtain change
   notify replies from the server. These replies contain information that should
   not be available to directory handles open for FILE_READ_ATTRIBUTE only.

o  CVE-2020-14323:
   winbind in version 3.6 and later implements a request to translate multiple
   Windows SIDs into names in one request. This was done for performance
   reasons: The Microsoft RPC call domain controllers offer to do this
   translation, so it was an obvious extension to also offer this batch
   operation on the winbind unix domain stream socket that is available to local
   processes on the Samba server.

   Due to improper input validation a hand-crafted packet can make winbind
   perform a NULL pointer dereference and thus crash.

o  CVE-2020-14383:
   Some DNS records (such as MX and NS records) usually contain data in the
   additional section. Samba's dnsserver RPC pipe (which is an administrative
   interface not used in the DNS server itself) made an error in handling the
   case where there are no records present: instead of noticing the lack of
   records, it dereferenced uninitialised memory, causing the RPC server to
   crash. This RPC server, which also serves protocols other than dnsserver,
   will be restarted after a short delay, but it is easy for an authenticated
   non-admin attacker to crash it again as soon as it returns. The Samba DNS
   server itself will continue to operate, but many RPC services will not.

For more details, please refer to the security advisories.


Changes since 4.12.8
--------------------

o  Jeremy Allison <jra@samba.org>
   * BUG 14434: CVE-2020-14318: s3: smbd: Ensure change notifies can't get set
     unless the directory handle is open for SEC_DIR_LIST.

o  Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
   * BUG 12795: CVE-2020-14383: Remote crash after adding NS or MX records using
     'samba-tool'.
   * BUG 14472: CVE-2020-14383: Remote crash after adding MX records.

o  Volker Lendecke <vl@samba.org>
   * BUG 14436: CVE-2020-14323: winbind: Fix invalid lookupsids DoS.


#######################################
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 4.12.8
                          October 07, 2020
                   ==============================


This is the latest stable release of the Samba 4.12 release series.


Changes since 4.12.7
--------------------

o  Günther Deschner <gd@samba.org>
   * BUG 14318: docs: Add missing winexe manpage.

o  Volker Lendecke <vl@samba.org>
   * BUG 14465: idmap_ad does not deal properly with a RFC4511 section 4.4.1
     response.

o  Laurent Menase <laurent.menase@hpe.com>
   * BUG 14388: winbind: Fix a memleak.

o  Stefan Metzmacher <metze@samba.org>
   * BUG 14465: idmap_ad does not deal properly with a RFC4511 section 4.4.1
     response.
   * BUG 14482: Compilation of heimdal tree fails if libbsd is not installed.

o  Christof Schmitt <cs@samba.org>
   * BUG 14166: util: Allow symlinks in directory_create_or_exist.

o  Andreas Schneider <asn@samba.org>
   * BUG 14399: waf: Only use gnutls_aead_cipher_encryptv2() for GnuTLS >
     3.6.14.
   * BUG 14467: s3:smbd: Fix %U substitutions if it contains a domain name.

o  Martin Schwenke <martin@meltin.net>
   * BUG 14466: ctdb disable/enable can fail due to race condition.


#######################################
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 4.12.7
                         September 18, 2020
                   ==============================


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

o CVE-2020-1472: Unauthenticated domain takeover via netlogon ("ZeroLogon").

The following applies to Samba used as domain controller only (most
seriously the Active Directory DC, but also the classic/NT4-style DC).

Installations running Samba as a file server only are not directly
affected by this flaw, though they may need configuration changes to
continue to talk to domain controllers (see "file servers and domain
members" below).

The netlogon protocol contains a flaw that allows an authentication
bypass. This was reported and patched by Microsoft as CVE-2020-1472.
Since the bug is a protocol level flaw, and Samba implements the
protocol, Samba is also vulnerable.

However, since version 4.8 (released in March 2018), the default
behaviour of Samba has been to insist on a secure netlogon channel,
which is a sufficient fix against the known exploits. This default is
equivalent to having 'server schannel = yes' in the smb.conf.

Therefore versions 4.8 and above are not vulnerable unless they have
the smb.conf lines 'server schannel = no' or 'server schannel = auto'.

Samba versions 4.7 and below are vulnerable unless they have 'server
schannel = yes' in the smb.conf.

Note each domain controller needs the correct settings in its smb.conf.

Vendors supporting Samba 4.7 and below are advised to patch their
installations and packages to add this line to the [global] section if
their smb.conf file.

The 'server schannel = yes' smb.conf line is equivalent to Microsoft's
'FullSecureChannelProtection=1' registry key, the introduction of
which we understand forms the core of Microsoft's fix.

Some domains employ third-party software that will not work with a
'server schannel = yes'. For these cases patches are available that
allow specific machines to use insecure netlogon. For example, the
following smb.conf:

   server schannel = yes
   server require schannel:triceratops$ = no
   server require schannel:greywacke$ = no

will allow only "triceratops$" and "greywacke$" to avoid schannel.

More details can be found here:
https://www.samba.org/samba/security/CVE-2020-1472.html


Changes since 4.12.6
--------------------

o  Jeremy Allison <jra@samba.org>
   * BUG 14497: CVE-2020-1472(ZeroLogon): s3:rpc_server/netlogon: Protect
     netr_ServerPasswordSet2 against unencrypted passwords.

o  Günther Deschner <gd@samba.org>
   * BUG 14497: CVE-2020-1472(ZeroLogon): s3:rpc_server/netlogon: Support
     "server require schannel:WORKSTATION$ = no" about unsecure configurations.

o  Gary Lockyer <gary@catalyst.net.nz>
   * BUG 14497: CVE-2020-1472(ZeroLogon): s4 torture rpc: repeated bytes in
     client challenge.

o  Stefan Metzmacher <metze@samba.org>
   * BUG 14497: CVE-2020-1472(ZeroLogon): libcli/auth: Reject weak client
     challenges in netlogon_creds_server_init()
     "server require schannel:WORKSTATION$ = no".


#######################################
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 4.12.6
                          August 13, 2020
		   ==============================


This is the latest stable release of the Samba 4.12 release series.


Changes since 4.12.5
--------------------

o  Jeremy Allison <jra@samba.org>
   * BUG 14403: s3: libsmb: Fix SMB2 client rename bug to a Windows server.

o  Andrew Bartlett <abartlet@samba.org>
   * BUG 14424: dsdb: Allow "password hash userPassword schemes = CryptSHA256"
     to work on RHEL7.
   * BUG 14450: dbcheck: Allow a dangling forward link outside our known NCs.

o  Ralph Boehme <slow@samba.org>
   * BUG 14426: lib/debug: Set the correct default backend loglevel to
     MAX_DEBUG_LEVEL.
   * BUG 14428: PANIC: Assert failed in get_lease_type().

o  Bjoern Jacke <bjacke@samba.org>
   * BUG 14422: util: Fix build on AIX by fixing the order of replace.h include.

o  Volker Lendecke <vl@samba.org>
   * BUG 14355: srvsvc_NetFileEnum asserts with open files.

o  Stefan Metzmacher <metze@samba.org>
   * BUG 14354: KDC breaks with DES keys still in the database and
     msDS-SupportedEncryptionTypes 31 indicating support for it.
   * BUG 14427: s3:smbd: Make sure vfs_ChDir() always sets
     conn->cwd_fsp->fh->fd = AT_FDCWD.
   * BUG 14428: PANIC: Assert failed in get_lease_type().

o  Andreas Schneider <asn@samba.org>
   * BUG 14358: docs: Fix documentation for require_membership_of of
     pam_winbind.conf.

o  Martin Schwenke <martin@meltin.net>
   * BUG 14444: ctdb-scripts: Use nfsconf utility for variable values in CTDB
     NFS scripts.

o  Andrew Walker <awalker@ixsystems.com>
   * BUG 14425: s3:winbind:idmap_ad: Make failure to get attrnames for schema
     mode fatal.


#######################################
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 4.12.5
                            July 02, 2020
		   ==============================


This is the latest stable release of the Samba 4.12 release series.


Changes since 4.12.4
--------------------

o  Jeremy Allison <jra@samba.org>
   * BUG 14301: Fix smbd panic on force-close share during async io.
   * BUG 14374: Fix segfault when using SMBC_opendir_ctx() routine for share
     folder that contains incorrect symbols in any file name.
   * BUG 14391: Fix DFS links.

o  Andrew Bartlett <abartlet@samba.org>
   * BUG 14310: Can't use DNS functionality after a Windows DC has been in
     domain.

o  Alexander Bokovoy <ab@samba.org>
   * BUG 14413: ldapi search to FreeIPA crashes.

o  Isaac Boukris <iboukris@gmail.com>
   * BUG 14396: Add net-ads-join dnshostname=fqdn option.
   * BUG 14406: Fix adding msDS-AdditionalDnsHostName to keytab with Windows DC.

o  Björn Jacke <bj@sernet.de>
   * BUG 14386: docs-xml: Update list of posible VFS operations for
     vfs_full_audit.

o  Volker Lendecke <vl@samba.org>
   * BUG 14382: winbindd: Fix a use-after-free when winbind clients exit.

o  Andreas Schneider <asn@samba.org>
   * BUG 14370: Client tools are not able to read gencache anymore.


#######################################
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 4.12.4
                            July 02, 2020
		   ==============================


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

o CVE-2020-10730: NULL pointer de-reference and use-after-free in Samba AD DC
		  LDAP Server with ASQ, VLV and paged_results.
o CVE-2020-10745: Parsing and packing of NBT and DNS packets can consume
		  excessive CPU
o CVE-2020-10760: LDAP Use-after-free in Samba AD DC Global Catalog with
		  paged_results and VLV.
o CVE-2020-14303: Empty UDP packet DoS in Samba AD DC nbtd.


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

o  CVE-2020-10730:
   A client combining the 'ASQ' and 'VLV' LDAP controls can cause a NULL pointer
   de-reference and further combinations with the LDAP paged_results feature can
   give a use-after-free in Samba's AD DC LDAP server.

o  CVE-2020-10745: Parsing and packing of NBT and DNS packets can consume
   excessive CPU.

o  CVE-2020-10760:
   The use of the paged_results or VLV controls against the Global Catalog LDAP
   server on the AD DC will cause a use-after-free.

o  CVE-2020-14303:
   The AD DC NBT server in Samba 4.0 will enter a CPU spin and not process
   further requests once it receives an empty (zero-length) UDP packet to
   port 137.

For more details, please refer to the security advisories.


Changes since 4.12.3
--------------------

o  Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
   * BUG 14378: CVE-2020-10745: Invalid DNS or NBT queries containing dots use
     several seconds of CPU each.

o  Andrew Bartlett <abartlet@samba.org>
   * BUG 14364: CVE-2020-10730: NULL de-reference in AD DC LDAP server when ASQ
     and VLV combined.
   * BUG 14402: CVE-2020-10760: Fix use-after-free in AD DC Global Catalog LDAP
     server with paged_result or VLV.
   * BUG 14417: CVE-2020-14303: Fix endless loop from empty UDP packet sent to
     AD DC nbt_server.

o  Gary Lockyer <gary@catalyst.net.nz>
   * BUG 14364: CVE-2020-10730: NULL de-reference in AD DC LDAP server when ASQ
     and VLV combined, ldb: Bump version to 2.1.4.


#######################################
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 4.12.3
                            May 19, 2020
		   ==============================


This is the latest stable release of the Samba 4.12 release series.


Changes since 4.12.2
--------------------

o  Jeremy Allison <jra@samba.org>
   * BUG 14301: Fix smbd panic on force-close share during async io.
   * BUG 14343: s3: vfs_full_audit: Add missing fcntl entry in vfs_op_names[]
     array.
   * BUG 14361: vfs_io_uring: Fix data corruption with Windows clients.
   * BUG 14372: Fix smbd crashes when MacOS Catalina connects if iconv
     initialization fails.

o  Ralph Boehme <slow@samba.org>
   * BUG 14150: Exporting from macOS Adobe Illustrator creates multiple copies.
   * BUG 14256: smbd does a chdir() twice per request.
   * BUG 14320: smbd mistakenly updates a file's write-time on close.
   * BUG 14350: vfs_shadow_copy2: implement case canonicalisation in
     shadow_copy2_get_real_filename().
   * BUG 14375: Fix Windows 7 clients problem after upgrading samba file server.

o  Alexander Bokovoy <ab@samba.org>
   * BUG 14359: s3: Pass DCE RPC handle type to create_policy_hnd.

o  Isaac Boukris <iboukris@gmail.com>
   * BUG 14155: Fix uxsuccess test with new MIT krb5 library 1.18.
   * BUG 14342: mit-kdc: Explicitly reject S4U requests.

o  Anoop C S <anoopcs@redhat.com>
   * BUG 14352: dbwrap_watch: Set rec->value_valid while returning nested
     share_mode_do_locked().

o  Amit Kumar <amitkuma@redhat.com>
   * BUG 14345: lib:util: Fix smbclient -l basename dir.

o  Volker Lendecke <vl@samba.org>
   * BUG 14336: s3:libads: Fix ads_get_upn().
   * BUG 14348: ctdb: Fix a memleak.
   * BUG 14366: Malicous SMB1 server can crash libsmbclient.

o  Gary Lockyer <gary@catalyst.net.nz>
   * BUG 14330: ldb: Bump version to 2.1.3, LMDB databases can grow without
     bounds

o  Stefan Metzmacher <metze@samba.org>
   * BUG 14361: vfs_io_uring: Fix data corruption with Windows clients.

o  Noel Power <noel.power@suse.com>
   * BUG 14344: s3/librpc/crypto: Fix double free with unresolved credential
     cache.

o  Andreas Schneider <asn@samba.org>
   * BUG 14358: docs-xml: Fix usernames in pam_winbind manpages.


#######################################
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 4.12.2
                           April 28, 2020
		   ==============================


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

o CVE-2020-10700: Use-after-free in Samba AD DC LDAP Server with ASQ
o CVE-2020-10704: LDAP Denial of Service (stack overflow) in Samba AD DC


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

o  CVE-2020-10700:
   A client combining the 'ASQ' and 'Paged Results' LDAP controls can cause a
   use-after-free in Samba's AD DC LDAP server.
o  CVE-2020-10704:
   A deeply nested filter in an un-authenticated LDAP search can exhaust the
   LDAP server's stack memory causing a SIGSEGV.

For more details, please refer to the security advisories.


Changes since 4.12.1
--------------------

o  Andrew Bartlett <abartlet@samba.org>
   * BUG 14331: CVE-2020-10700: Fix use-after-free in AD DC LDAP server when
     ASQ and paged_results combined.

o  Gary Lockyer <gary@catalyst.net.nz>
   * BUG 20454: CVE-2020-10704: Fix LDAP Denial of Service (stack overflow) in
     Samba AD DC.


#######################################
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 4.12.1
                           April 07, 2020
		   ==============================


This is the latest stable release of the Samba 4.12 release series.


Changes since 4.12.0
--------------------

o  Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
   * BUG 14295: nmblib: Avoid undefined behaviour in handle_name_ptrs().

o  Björn Baumbach <bb@sernet.de>
   * BUG 14296: samba-tool group: Handle group names with special chars
     correctly.

o  Ralph Boehme <slow@samba.org>
   * BUG 14293: Add missing check for DMAPI offline status in async DOS
     attributes.
   * BUG 14295: Starting ctdb node that was powered off hard before results in
     recovery loop.
   * BUG 14307: smbd: Ignore set NTACL requests which contain S-1-5-88 NFS ACEs.
   * BUG 14316: vfs_recycle: Prevent flooding the log if we're called on
     non-existant paths.

o  Günther Deschner <gd@samba.org>
   * BUG 14313: librpc: Fix IDL for svcctl_ChangeServiceConfigW.
   * BUG 14327: nsswitch: Fix use-after-free causing segfault in
     _pam_delete_cred.

o  Art M. Gallagher <repos@artmg.net>
   * BUG 13622: fruit:time machine max size is broken on arm.

o  Amitay Isaacs <amitay@gmail.com>
   * BUG 14294: CTDB recovery corner cases can cause record resurrection and
     node banning.

o  Noel Power <noel.power@suse.com>
   * BUG 14332: s3/utils: Fix double free error with smbtree.

o  Martin Schwenke <martin@meltin.net>
   * BUG 14294: CTDB recovery corner cases can cause record resurrection and
     node banning.
   * BUG 14295: Starting ctdb node that was powered off hard before results in
     recovery loop.
   * BUG 14324: CTDB recovery daemon can crash due to dereference of NULL
     pointer.


#######################################
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 4.12.0
                           March 03, 2020
		   ==============================


This is the first stable release of the Samba 4.12 release series.
Please read the release notes carefully before upgrading.


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

Python 3.5 Required
-------------------

Samba's minimum runtime requirement for python was raised to Python
3.4 with samba 4.11.  Samba 4.12 raises this minimum version to Python
3.5 both to access new features and because this is the oldest version
we test with in our CI infrastructure.

(Build time support for the file server with Python 2.6 has not
changed)

Removing in-tree cryptography: GnuTLS 3.4.7 required
----------------------------------------------------

Samba is making efforts to remove in-tree cryptographic functionality,
and to instead rely on externally maintained libraries.  To this end,
Samba has chosen GnuTLS as our standard cryptographic provider.

Samba now requires GnuTLS 3.4.7 to be installed (including development
headers at build time) for all configurations, not just the Samba AD
DC.

Thanks to this work Samba no longer ships an in-tree DES
implementation and on GnuTLS 3.6.5 or later Samba will include no
in-tree cryptography other than the MD4 hash and that
implemented in our copy of Heimdal.

Using GnuTLS for SMB3 encryption you will notice huge performance and copy
speed improvements. Tests with the CIFS Kernel client from Linux Kernel 5.3
show a 3x speed improvement for writing and a 2.5x speed improvement for reads!

NOTE WELL: The use of GnuTLS means that Samba will honour the
system-wide 'FIPS mode' (a reference to the US FIPS-140 cryptographic
standard) and so will not operate in many still common situations if
this system-wide parameter is in effect, as many of our protocols rely
on outdated cryptography.

A future Samba version will mitigate this to some extent where good
cryptography effectively wraps bad cryptography, but for now that above
applies.

zlib library is now required to build Samba
-------------------------------------------

Samba no longer includes a local copy of zlib in our source tarball.
By removing this we do not need to ship (even where we did not
build) the old, broken zip encryption code found there.

New Spotlight backend for Elasticsearch
---------------------------------------

Support for the macOS specific Spotlight search protocol has been enhanced
significantly. Starting with 4.12 Samba supports using Elasticsearch as search
backend. Various new parameters have been added to configure this:

  spotlight backend = noindex | elasticsearch | tracker
  elasticsearch:address = ADDRESS
  elasticsearch:port = PORT
  elasticsearch:use tls = BOOLEAN
  elasticsearch:index = INDEXNAME
  elasticsearch:mappings = PATH
  elasticsearch:max results = NUMBER

Samba also ships a Spotlight client command "mdfind" which can be used to search
any SMB server that runs the Spotlight RPC service. See the manpage of mdfind
for details.

Note that when upgrading existing installations that are using the previous
default Spotlight backend Gnome Tracker must explicitly set "spotlight backend =
tracker" as the new default is "noindex".

'net ads kerberos pac save' and 'net eventlog export'
-----------------------------------------------------

The 'net ads kerberos pac save' and 'net eventlog export' tools will
no longer silently overwrite an existing file during data export.  If
the filename given exits, an error will be shown.

Fuzzing
-------

A large number of fuzz targets have been added to Samba, and Samba has
been registered in Google's oss-fuzz cloud fuzzing service.  In
particular, we now have good fuzzing coverage of our generated NDR
parsing code.

A large number of issues have been found and fixed thanks to this
effort.

'samba-tool' improvements add contacts as member to groups
----------------------------------------------------------

Previously 'samba-tool group addmemers' can just add users, groups and
computers as members to groups. But also contacts can be members of
groups. Samba 4.12 adds the functionality to add contacts to
groups. Since contacts have no sAMAccountName, it's possible that
there are more than one contact with the same name in different
organizational units. Therefore it's necessary to have an option to
handle group members by their DN.

To get the DN of an object there is now the "--full-dn" option available
for all necessary commands.

The MS Windows UI allows to search for specific types of group members
when searching for new members for a group. This feature is included
here with the new samba-tool group addmembers "--object-type=OBJECTYPE"
option. The different types are selected accordingly to the Windows
UI. The default samba-toole behaviour shouldn't be changed.

Allow filtering by OU or subtree in samba-tool
----------------------------------------------

A new "--base-dn" and "--member-base-dn" option is added to relevant
samba-tool user, group and ou management commands to allow operation
on just one part of the AD tree, such as a single OU.

VFS
===

SMB_VFS_NTIMES
--------------

Samba now uses a sentinel value based on utimensat(2) UTIME_OMIT to denote
to-be-ignored timestamp variables passed to the SMB_VFS_NTIMES() VFS function.

VFS modules can check whether any of the time values inside a struct
smb_file_time is to be ignored by calling is_omit_timespec() on the value.

'io_uring' vfs module
---------------------

The module makes use of the new io_uring infrastructure
(intruduced in Linux 5.1), see https://lwn.net/Articles/776703/

Currently this implements SMB_VFS_{PREAD,PWRITE,FSYNC}_SEND/RECV
and avoids the overhead of the userspace threadpool in the default
vfs backend. See also vfs_io_uring(8).

In order to build the module you need the liburing userspace library
and its developement headers installed, see
https://git.kernel.dk/cgit/liburing/

At runtime you'll need a Linux kernel with version 5.1 or higher.
Note that 5.4.14 and 5.4.15 have a regression that breaks the Samba
module! The regression was fixed in Linux 5.4.16 again.

MS-DFS changes in the VFS
-------------------------

This release changes set getting and setting of MS-DFS redirects
on the filesystem to go through two new VFS functions:

SMB_VFS_CREATE_DFS_PATHAT()
SMB_VFS_READ_DFS_PATHAT()

instead of smbd explicitly storing MS-DFS redirects inside
symbolic links on the filesystem. The underlying default
implementations of this has not changed, the redirects are
still stored inside symbolic links on the filesystem, but
moving the creation and reading of these links into the VFS
as first-class functions now allows alternate methods of
storing them (maybe in extended attributes) for OEMs who
don't want to mis-use filesystem symbolic links in this
way.


CTDB changes
============

* The ctdb_mutex_fcntl_helper periodically re-checks the lock file

  The re-check period is specified using a 2nd argument to this
  helper.  The default re-check period is 5s.

  If the file no longer exists or the inode number changes then the
  helper exits.  This triggers an election.


REMOVED FEATURES
================

The smb.conf parameter "write cache size" has been removed.

Since the in-memory write caching code was written, our write path has
changed significantly. In particular we have gained very flexible
support for async I/O, with the new linux io_uring interface in
development.  The old write cache concept which cached data in main
memory followed by a blocking pwrite no longer gives any improvement
on modern systems, and may make performance worse on memory-contrained
systems, so this functionality should not be enabled in core smbd
code.

In addition, it complicated the write code, which is a performance
critical code path.

If required for specialist purposes, it can be recreated as a VFS
module.

Retiring DES encryption types in Kerberos.
------------------------------------------
With this release, support for DES encryption types has been removed from
Samba, and setting DES_ONLY flag for an account will cause Kerberos
authentication to fail for that account (see RFC-6649).

Samba-DC: DES keys no longer saved in DB.
-----------------------------------------
When a new password is set for an account, Samba DC will store random keys
in DB instead of DES keys derived from the password.  If the account is being
migrated to Windbows or to an older version of Samba in order to use DES keys,
the password must be reset to make it work.

Heimdal-DC: removal of weak-crypto.
-----------------------------------
Following removal of DES encryption types from Samba, the embedded Heimdal
build has been updated to not compile weak crypto code (HEIM_WEAK_CRYPTO).

vfs_netatalk: The netatalk VFS module has been removed.
-------------------------------------------------------

The netatalk VFS module has been removed. It was unmaintained and is not needed
any more.

BIND9_FLATFILE deprecated
-------------------------

The BIND9_FLATFILE DNS backend is deprecated in this release and will
be removed in the future.  This was only practically useful on a single
domain controller or under expert care and supervision.

This release removes the 'rndc command' smb.conf parameter, which
supported this configuration by writing out a list of DCs permitted to
make changes to the DNS Zone and nudging the 'named' server if a new
DC was added to the domain.  Administrators using BIND9_FLATFILE will
need to maintain this manually from now on.


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

  Parameter Name                     Description                Default
  --------------                     -----------                -------

  elasticsearch:address              New                        localhost
  elasticsearch:port                 New                        9200
  elasticsearch:use tls              New                        No
  elasticsearch:index                New                        _all
  elasticsearch:mappings             New                        DATADIR/elasticsearch_mappings.json
  elasticsearch:max results          New                        100
  nfs4:acedup                        Changed default            merge
  rndc command                       Removed
  write cache size                   Removed
  spotlight backend		     New			noindex


CHANGES SINCE 4.12.0rc4
=======================

o  Andrew Bartlett <abartlet@samba.org>
   * BUG 14258: dsdb: Correctly handle memory in objectclass_attrs.


CHANGES SINCE 4.12.0rc3
=======================

o  Jeremy Allison <jra@samba.org>
   * BUG 14269: s3: DFS: Don't allow link deletion on a read-only share.

o  Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
   * BUG 14284: pidl/wscript: configure should insist on Parse::Yapp::Driver.

o  Andrew Bartlett <abartlet@samba.org>
   * BUG 14270: ldb: Fix search with scope ONE and small result sets.
   * BUG 14284: build: Do not check if system perl modules should be bundled.

o  Volker Lendecke <vl@samba.org>
   * BUG 14285: smbd fails to handle EINTR from open(2) properly.

o  Stefan Metzmacher <metze@samba.org>
   * BUG 14270: ldb: version 2.1.1.


CHANGES SINCE 4.12.0rc2
=======================

o  Jeremy Allison <jra@samba.org>
   * BUG 14282: Set getting and setting of MS-DFS redirects on the filesystem
     to go through two new VFS functions SMB_VFS_CREATE_DFS_PATHAT() and
     SMB_VFS_READ_DFS_PATHAT().

o  Andrew Bartlett <abartlet@samba.org>
   * BUG 14255: bootstrap: Remove un-used dependency python3-crypto.

o  Volker Lendecke <vl@samba.org>
   * BUG 14247: Fix CID 1458418 and 1458420.
   * BUG 14281: lib: Fix a shutdown crash with "clustering = yes".

o  Stefan Metzmacher <metze@samba.org>
   * BUG 14247: Winbind member (source3) fails local SAM auth with empty domain
     name.
   * BUG 14265: winbindd: Handle missing idmap in getgrgid().
   * BUG 14271: Don't use forward declaration for GnuTLS typedefs.
   * BUG 14280: Add io_uring vfs module.

o  Andreas Schneider <asn@samba.org>
   * BUG 14250: libcli:smb: Improve check for gnutls_aead_cipher_(en|de)cryptv2.


CHANGES SINCE 4.12.0rc1
=======================

o  Jeremy Allison <jra@samba.org>
   * BUG 14239: s3: lib: nmblib. Clean up and harden nmb packet processing.

o  Andreas Schneider <asn@samba.org>
   * BUG 14253: lib:util: Log mkdir error on correct debug levels.


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

https://wiki.samba.org/index.php/Release_Planning_for_Samba_4.12#Release_blocking_bugs


#######################################
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
======================================================================