Samba 4.15.0rc6 Available for Download
This is the sixth release candidate of Samba 4.15. This is *not* intended for production environments and is designed for testing purposes only. Please report any defects via the Samba bug reporting system at https://bugzilla.samba.org/.
Samba 4.15 will be the next version of the Samba suite.
UPGRADING
=========
Removed SMB (development) dialects
----------------------------------
The following SMB (development) dialects are no longer supported: SMB2_22, SMB2_24 and SMB3_10. They are were only supported by Windows technical preview builds. They used to be useful in order to test against the latest Windows versions, but it's no longer useful to have them. If you have them explicitly specified in your smb.conf or an the command line, you need to replace them like this:
- SMB2_22 => SMB3_00
- SMB2_24 => SMB3_00
- SMB3_10 => SMB3_11
Note that it's typically not useful to specify "client max protocol" or "server max protocol" explicitly to a specific dialect, just leave them unspecified or specify the value "default".
New GPG key
-----------
The GPG release key for Samba releases changed from:
pub dsa1024/6F33915B6568B7EA 2007-02-04 [SC] [expires: 2021-02-05] Key fingerprint = 52FB C0B8 6D95 4B08 4332 4CDC 6F33 915B 6568 B7EA
uid [ full ] Samba Distribution Verification Key
sub elg2048/9C6ED163DA6DFB44 2007-02-04 [E] [expires: 2021-02-05]
to the following new key:
pub rsa4096/AA99442FB680B620 2020-12-21 [SC] [expires: 2022-12-21] Key fingerprint = 81F5 E283 2BD2 545A 1897 B713 AA99 442F B680 B620
uid [ultimate] Samba Distribution Verification Key
sub rsa4096/97EF9386FBFD4002 2020-12-21 [E] [expires: 2022-12-21]
Starting from Jan 21th 2021, all Samba releases will be signed with the new key.
See also GPG_AA99442FB680B620_replaces_6F33915B6568B7EA.txt
New minimum version for the experimental MIT KDC
------------------------------------------------
The build of the AD DC using the system MIT Kerberos, an experimental feature, now requires MIT Kerberos 1.19. An up-to-date Fedora 34 has this version and has backported fixes for the KDC crash bugs CVE-2021-37750 and CVE-2021-36222
NEW FEATURES/CHANGES
====================
Bind DLZ: add the ability to set allow/deny lists for zone transfer clients
---------------------------------------------------------------------------
Up to now, any client could use a DNS zone transfer request to the bind server, and get an answer from Samba. Now the default behaviour will be to deny those request. Two new options have been added to manage the list of authorized/denied clients for zone transfer requests. In order to be accepted, the request must be issued by a client that is in the allow list and NOT in the deny list.
"server multi channel support" no longer experimental
-----------------------------------------------------
This option is enabled by default starting with 4.15 (on Linux and FreeBSD).Due to dependencies on kernel APIs of Linux or FreeBSD, it's only possible to use this feature on Linux and FreeBSD for now.
samba-tool available without the ad-dc
--------------------------------------
The 'samba-tool' command is now available when samba is configured "--without-ad-dc". Not all features will work, and some ad-dc specific options have been disabled. The 'samba-tool domain' options, for example, are limited when no ad-dc is present. Samba must still be built with ads in order to enable 'samba-tool'.
Improved command line user experience
-------------------------------------
Samba utilities did not consistently implement their command line interface. A number of options were requiring to specify values in one tool and not in the other, some options meant different in different tools.
These should be stories of the past now. A new command line parser has been implemented with sanity checking. Also the command line interface has been simplified and provides better control for encryption, signing and kerberos.
Also several command line options have a smb.conf variable to control the default now.
All tools are now logging to stderr by default. You can use "--debug-stdout" to change the behavior. All servers will log to stderr at early startup until logging is setup to go to a file by default.
### Common parser:
Options added:
--client-protection=off|sign|encrypt
Options renamed:
--kerberos -> --use-kerberos=required|desired|off --krb5-ccache -> --use-krb5-ccache=CCACHE
--scope -> --netbios-scope=SCOPE
--use-ccache -> --use-winbind-ccache
Options removed:
-e|--encrypt
-C removed from --use-winbind-ccache
-i removed from --netbios-scope
-S|--signing
### Duplicates in command line utils
ldbadd/ldbsearch/ldbdel/ldbmodify/ldbrename:
-e is not available for --editor anymore
-s is not used for --configfile anymore
ndrdump:
-l is not available for --load-dso anymore
net:
-l is not available for --long anymore
sharesec:
-V is not available for --viewsddl anymore
smbcquotas:
--user -> --quota-user
nmbd:
--log-stdout -> --debug-stdout
smbd:
--log-stdout -> --debug-stdout
winbindd:
--log-stdout -> --debug-stdout
Scanning of trusted domains and enterprise principals
-----------------------------------------------------
As an artifact from the NT4 times, we still scanned the list of trusted domains on winbindd startup. This is wrong as we never can get a full picture in Active Directory. It is time to change the default value to "No". Also with this change we always use enterprise principals for Kerberos so that the DC will be ableto redirect ticket requests to the right DC. This is e.g. needed for one waytrusts. The options `winbind use krb5 enterprise principals` and `winbind scan trusted domains` will be deprecated in one of the next releases.
Support for Offline Domain Join (ODJ)
-------------------------------------
The net utility is now able to support the offline domain join feature as known from the Windows djoin.exe command for many years. Samba's implementation is accessible via the 'net offlinejoin' subcommand. It can provision computers and request offline joining for both Windows and Unix machines. It is also possible to provision computers from Windows (using djoin.exe) and use the generated data in Samba's 'net' utility. The existing options for the provisioning and joining steps are documented in the net(8) manpage.
'samba-tool dns zoneoptions' for aging control
----------------------------------------------
The 'samba-tool dns zoneoptions' command can be used to turn aging on and off, alter the refresh and no-refresh periods, and manipulate the timestamps of existing records.
To turn aging on for a zone, you can use something like this:
samba-tool dns zoneoptions --aging=1 --refreshinterval=306600
which turns on aging and ensures no records less than five years old are aged out and scavenged. After aging has been on for sufficient time for records to be renewed, the command
samba-tool dns zoneoptions --refreshinterval=168
will set the refresh period to the standard seven days. Using this two step process will help prevent the temporary loss of dynamic records if scavenging happens before their first renewal.
Marking old records as static or dynamic with 'samba-tool'
----------------------------------------------------------
A bug in Samba versions prior to 4.9 meant records that were meant to be static were marked as dynamic and vice versa. To fix the timestamps in these domains, it is possible to use the following options, preferably before turning aging on.
--mark-old-records-static
--mark-records-dynamic-regex
--mark-records-static-regex
The "--mark-old-records-static" option will make records older than the specified date static (that is, with a zero timestamp). For example, if you upgraded to Samba 4.9 in November 2018, you could use ensure no old records will be mistakenly interpreted as dynamic using the following option:
samba-tool dns zoneoptions --mark-old-records-static=2018-11-30
Then, if you know that that will have marked some records as static that should be dynamic, and you know which those are due to your naming scheme, you can use commands like:
samba-tool dns zoneoptions --mark-records-dynamic-regex='\w+-desktop'
where '\w+-desktop' is a perl-compatible regular expression that will match 'bob-desktop', 'alice-desktop', and so on.
These options are deliberately long and cumbersome to type, so people have a chance to think before they get to the end. You can make a mess if you get it wrong.
All 'samba-tool dns zoneoptions' modes can be given a "--dry-run/-n" argument that allows you to inspect the likely results before going ahead.
NOTE: for aging to work, you need to have "dns zone scavenging = yes" set in the smb.conf of at least one server.
DNS tombstones are now deleted as appropriate
---------------------------------------------
When all the records for a DNS name have been deleted, the node is put in a tombstoned state (separate from general AD object tombstoning, which deleted nodes also go through). These tombstones should be cleaned up periodically. Due to a conflation of scavenging and tombstoning, we have only been deleting tombstones when aging is enabled.
If you have a lot of tombstoned DNS nodes (that is, DNS names for which you have removed all the records), cleaning up these DNS tombstones may take a noticeable time.
DNS tombstones use a consistent timestamp format
------------------------------------------------
DNS records use an hours-since-1601 timestamp format except for in the case of tombstone records where a 100-nanosecond-intervals-since-1601 format is used (this latter format being the most common in Windows). We had mixed that up, which might have had strange effects in zones where aging was enabled (and hence tombstone timestamps were used).
samba-tool dns update and RPC changes
-------------------------------------
The dnsserver DCERPC pipe can be used by 'samba-tool' and Windows tools to manipulate dns records on the remote server. A bug in Samba meant it was not possible to update an existing DNS record to change the TTL. The general behaviour of RPC updates is now closer to that of Windows.
'samba-tool dns update' is now a bit more careful in rejecting and warning you about malformed IPv4 and IPv6 addresses.
CVE-2021-3671: Crash in Heimdal KDC and updated security release policy
-----------------------------------------------------------------------
An unuthenticated user can crash the AD DC KDC by omitting the server name in a TGS-REQ. Per Samba's updated security process a specific security release was not made for this issue as it is a recoverable Denial Of Service.
See https://wiki.samba.org/index.php/Samba_Security_Proces
samba-tool domain backup offline with the LMDB backend
------------------------------------------------------
samba-tool domain backup offline, when operating with the LMDB backend now correctly takes out locks against concurrent modification of the database during the backup. If you use this tool on a Samba AD DC using LMDB, you should upgrade to this release for safer backups.
REMOVED FEATURES
================
Tru64 ACL support has been removed from this release. The last supported release of Tru64 UNIX was in 2012.
NIS support has been removed from this release. This is not available in Linux distributions anymore.
The DLZ DNS plugin is no longer built for Bind versions 9.8 and 9.9, which have been out of support since 2018.
smb.conf changes
================
Parameter Name Description Default
-------------- ----------- -------
client use kerberos New desired
client max protocol Values Removed
client min protocol Values Removed
client protection New default
client smb3 signing algorithms New see man smb.conf
client smb3 encryption algorithms New see man smb.conf
preopen:posix-basic-regex New No
preopen:nomatch_log_level New 5
preopen:match_log_level New 5
preopen:nodigits_log_level New 1
preopen:founddigits_log_level New 3
preopen:reset_log_level New 5
preopen:push_log_level New 3
preopen:queue_log_level New 10
server max protocol Values Removed
server min protocol Values Removed
server multi channel support Changed Yes (on Linux
and FreeBSD)
server smb3 signing algorithms New see man smb.conf
server smb3 encryption algorithms New see man smb.conf
winbind use krb5 enterprise principals Changed Yes winbind scan trusted domains Changed No
CHANGES SINCE 4.15.0rc5
=======================
o Andrew Bartlett
* BUG 14806: Address a signifcant performance regression in database access
in the AD DC since Samba 4.12.
* BUG 14807: Fix performance regression in
lsa_LookupSids3/LookupNames4 since
Samba 4.9 by using an explicit database handle cache. * BUG 14817: An unuthenticated user can crash the AD DC KDC by omitting the
server name in a TGS-REQ.
* BUG 14818: Address flapping samba_tool_drs_showrepl test. * BUG 14819: Address flapping dsdb_schema_attributes test.
o Luke Howard
* BUG 14817: An unuthenticated user can crash the AD DC KDC by omitting the
server name in a TGS-REQ.
o Gary Lockyer
* BUG 14817: An unuthenticated user can crash the AD DC KDC by omitting the
server name in a TGS-REQ.
o Andreas Schneider
* BUG 14817: An unuthenticated user can crash the AD DC KDC by omitting the
server name in a TGS-REQ.
o Joseph Sutton
* BUG 14817: An unuthenticated user can crash the AD DC KDC by omitting the
server name in a TGS-REQ.
CHANGES SINCE 4.15.0rc4
=======================
o Jeremy Allison
* BUG 14809: Shares with variable substitutions cause core dump upon connection from MacOS Big Sur 11.5.2.
* BUG 14816: Fix pathref open of a filesystem fifo in the DISABLE_OPATH
build.
o Andrew Bartlett
* BUG 14815: A subset of tests from Samba's selftest system were not being
run, while others were run twice.
o Ralph Boehme
* BUG 14771: Some VFS operations on pathref (O_PATH) handles fail on GPFS.
* BUG 14787: net conf list crashes when run as normal user, * BUG 14803: smbd/winbindd started in daemon mode generate output on stderr/stdout.
* BUG 14804: winbindd can crash because idmap child state is not fully initialized.
o Stefan Metzmacher
* BUG 14771: Some VFS operations on pathref (O_PATH) handles fail on GPFS.
CHANGES SINCE 4.15.0rc3
=======================
o Bjoern Jacke
* BUG 14800: util_sock: fix assignment of sa_socklen.
CHANGES SINCE 4.15.0rc2
=======================
o Jeremy Allison
* BUG 14760: vfs_streams_depot directory creation permissions and store
location problems.
* BUG 14766: vfs_ceph openat() doesn't cope with dirfsp != AT_FDCW. * BUG 14769: smbd panic on force-close share during offload write. * BUG 14805: OpenDir() loses the correct errno return.
o Ralph Boehme
* BUG 14795: copy_file_range() may fail with EOPNOTSUPP.
o Stefan Metzmacher
* BUG 14793: Start the SMB encryption as soon as possible.
o Andreas Schneider
* BUG 14779: Winbind should not start if the socket path is too long.
o Noel Power
* BUG 14760: vfs_streams_depot directory creation permissions and store
location problems.
CHANGES SINCE 4.15.0rc1
=======================
o Andreas Schneider
* BUG 14768: smbd/winbind should load the registry if configured * BUG 14777: do not quote passed argument of configure script * BUG 14779: Winbind should not start if the socket path is too long
o Stefan Metzmacher
* BUG 14607: tree connect failed: NT_STATUS_INVALID_PARAMETER * BUG 14764: aes-256-gcm and aes-256-ccm doesn't work in the server
o Ralph Boehme
* BUG 14700: file owner not available when file unredable
o Jeremy Allison
* BUG 14607: tree connect failed: NT_STATUS_INVALID_PARAMETER * BUG 14759: 4.15rc can leak meta-data about the directory containing the
share path
KNOWN ISSUES
============
https://wiki.samba.org/index.php/Release_Planning_for_Samba_4.15#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.libera.chat or the #samba-technical:matrix.org matrix channel.
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
======================================================================
================
Download Details
================
The uncompressed tarballs and patch files have been signed
using GnuPG (ID AA99442FB680B620). The source code can be downloaded from:
https://download.samba.org/pub/samba/rc/
The release notes are available online at:
https://download.samba.org/pub/samba/rc/samba-4.15.0rc6.WHATSNEW.txt
Our Code, Our Bugs, Our Responsibility.
( https://bugzilla.samba.org/)
--Enjoy
The Samba Team
The Samba team has announced the sixth release candidate of Samba 4.15 for testing. Samba is the standard Windows interoperability suite of programs for Linux and Unix.
