Samba 4.8 Features added/changed

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Samba 4.8.4

Release Notes for Samba 4.8.4
August 14, 2018

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

  • CVE-2018-1139 (Weak authentication protocol allowed.)
  • CVE-2018-1140 (Denial of Service Attack on DNS and LDAP server.)
  • CVE-2018-10858 (Insufficient input validation on client directory listing in libsmbclient.)
  • CVE-2018-10918 (Denial of Service Attack on AD DC DRSUAPI server.)
  • CVE-2018-10919 (Confidential attribute disclosure from the AD LDAP server.)


Details

  • CVE-2018-1139: Vulnerability that allows authentication via NTLMv1 even if disabled.
  • CVE-2018-1140: Missing null pointer checks may crash the Samba AD DC, both over DNS and LDAP.
  • CVE-2018-10858: A malicious server could return a directory entry that could corrupt libsmbclient memory.
  • CVE-2018-10918: Missing null pointer checks may crash the Samba AD DC, over the authenticated DRSUAPI RPC service.
  • CVE-2018-10919: Missing access control checks allow discovery of confidential attribute values via authenticated LDAP search expressions.


Changes since 4.8.3:

  • Jeremy Allison <jra@samba.org>
  • Andrew Bartlett <abartlet@samba.org>
  • BUG #13374: CVE-2018-1140: ldbsearch '(distinguishedName=abc)' and DNS query with escapes crashes, ldb: Release LDB 1.3.5 for CVE-2018-1140
  • BUG #13552: CVE-2018-10918: cracknames: Fix DoS (NULL pointer de-ref) when not servicePrincipalName is set on a user.
  • Tim Beale <timbeale@catalyst.net.nz>
  • Günther Deschner <gd@samba.org>
  • Andrej Gessel <Andrej.Gessel@janztec.com>
https://www.samba.org/samba/history/samba-4.8.4.html

Samba 4.8.3

Release Notes for Samba 4.8.3
June 26, 2018

This is the latest stable release of the Samba 4.8 release series.

Changes since 4.8.2:

  • Jeremy Allison <jra@samba.org>
  • BUG #13428: s3: smbd: Fix SMB2-FLUSH against directories.
  • BUG #13457: s3: smbd: printing: Re-implement delete-on-close semantics for print files missing since 3.5.x.
  • BUG #13474: python: Fix talloc frame use in make_simple_acl().
  • Jeffrey Altman <jaltman@secure-endpoints.com>
  • BUG #11573: heimdal: lib/krb5: Do not fail set_config_files due to parse error.
  • Andrew Bartlett <abartlet@samba.org>
  • ldb: version 1.3.4
  • BUG #13448: ldb: One-level search was incorrectly falling back to full DB scan.
  • BUG #13452: ldb: Save a copy of the index result before calling the callbacks.
  • BUG #13454: No Backtrace given by Samba's AD DC by default.
  • BUG #13471: ldb_tdb: Use mem_ctx and so avoid leak onto long-term memory on duplicated add.
  • Ralph Boehme <slow@samba.org>
  • BUG #13432: s3:smbd: Fix interaction between chown and SD flags.
  • Günther Deschner <gd@samba.org>
  • Andrej Gessel <Andrej.Gessel@janztec.com>
  • BUG #13475: Fix several mem leaks in ldb_index ldb_search ldb_tdb.
  • Volker Lendecke <vl@samba.org>
  • Stefan Metzmacher <metze@samba.org>
  • BUG #13369: Looking up the user using the UPN results in user name with the REALM instead of the DOMAIN.
  • BUG #13427: Fix broken server side GENSEC_FEATURE_LDAP_STYLE handling (NTLMSSP NTLM2 packet check failed due to invalid signature!).
  • Christof Schmitt <cs@samba.org>
  • BUG #13446: smbd: Flush dfree memcache on service reload.
  • BUG #13478: krb5_wrap: Fix keep_old_entries logic for older Kerberos libraries.
  • Andreas Schneider <asn@samba.org>
  • BUG #13369: Looking up the user using the UPN results in user name with the REALM instead of the DOMAIN.
  • BUG #13437: Fix building Samba with gcc 8.1.
  • BUG #13440: s3:utils: Do not segfault on error in DoDNSUpdate().
  • BUG #13480: krb5_plugin: Add winbind localauth plugin for MIT Kerberos.
  • Lukas Slebodnik <lslebodn@fedoraproject.org>
  • BUG #13459: ldb: Fix memory leak on module context.
https://www.samba.org/samba/history/samba-4.8.3.html

Samba 4.8.2

Release Notes for Samba 4.8.2
May 16, 2018

This is the latest stable release of the Samba 4.8 release series.

Major bug fixes include:

  • After update to 4.8.0 DC failed with "Failed to find our own NTDS Settings objectGUID" (BUG #13335).

Changes since 4.8.1:

  • Jeremy Allison <jra@samba.org>
  • BUG #13380: s3: smbd: Generic fix for incorrect reporting of stream dos attributes on a directory.
  • BUG #13412: ceph: VFS: Add asynchronous fsync to ceph module, fake using synchronous call.
  • BUG #13419: s3: libsmbclient: Fix hard-coded connection error return of ETIMEDOUT.
  • Andrew Bartlett <abartlet@samba.org>
  • Fix failure to upgrade to the GUID index DB format.
  • Add tests for GUID index behaviour.
  • BUG #13420: s4-lsa: Fix use-after-free in LSA server.
  • BUG #13430: winbindd: Do re-connect if the RPC call fails in the passdb case.
  • Ralph Boehme <slow@samba.org>
  • BUG #13416: s3:cleanupd: Sends MSG_SMB_UNLOCK twice to interested peers.
  • BUG #13414: s3:cleanupd: Use MSG_SMB_BRL_VALIDATE to signal cleanupd unclean process shutdown.
  • David Disseldorp <ddiss@samba.org>
  • BUG #13425: vfs_ceph: add fake async pwrite/pread send/recv hooks.
  • Amitay Isaacs <amitay@gmail.com>
  • BUG #13411: ctdb-client: Remove ununsed functions from old client code.
  • Björn Jacke <bjacke@samba.org>
  • BUG #13395: printing: Return the same error code as windows does on upload failures.
  • Gary Lockyer <gary@catalyst.net.nz>
  • BUG #13335: After update to 4.8.0 DC failed with "Failed to find our own NTDS Settings objectGUID".
  • Stefan Metzmacher <metze@samba.org>
  • BUG #13400: nsswitch: Fix memory leak in winbind_open_pipe_sock() when the privileged pipe is not accessable.
  • BUG #13420: s4:lsa_lookup: remove TALLOC_FREE(state) after all dcesrv_lsa_Lookup{Names,Sids}_base_map() calls.
  • Vandana Rungta <vrungta@amazon.com>
  • BUG #13424: s3: VFS: Fix memory leak in vfs_ceph.
  • Christof Schmitt <cs@samba.org>
  • BUG #13407: rpc_server: Fix NetSessEnum with stale sessions.
  • Andreas Schneider <asn@samba.org>
  • BUG #13417: s3:smbspool: Fix cmdline argument handling.
https://www.samba.org/samba/history/samba-4.8.2.html

Samba 4.8.1

Release Notes for Samba 4.8.1
April 26, 2018

This is the latest stable release of the Samba 4.8 release series.

Changes since 4.8.0:

  • Jeremy Allison <jra@samba.org>
  • BUG #13244: s3: ldap: Ensure the ADS_STRUCT pointer doesn't get freed on error, we don't own it here.
  • BUG #13270: s3: smbd: Fix possible directory fd leak if the underlying OS doesn't support fdopendir().
  • BUG #13319: Round-tripping ACL get/set through vfs_fruit will increase the number of ACE entries without limit.
  • BUG #13347: s3: smbd: SMB2: Add DBGC_SMB2_CREDITS class to specifically debug credit issues.
  • BUG #13358: s3: smbd: Files or directories can't be opened DELETE_ON_CLOSE without delete access.
  • BUG #13372: s3: smbd: Fix memory leak in vfswrap_getwd().
  • BUG #13375: s3: smbd: Unix extensions attempts to change wrong field in fchown call.
  • Björn Baumbach <bb@sernet.de>
  • BUG #13337: ms_schema/samba-tool visualize: Fix python2.6 incompatibility.
  • Timur I. Bakeyev <timur@iXsystems.com>
  • BUG #13352: Fix invocation of gnutls_aead_cipher_encrypt().
  • Ralph Boehme <slow@samba.org>
  • BUG #13328: Windows 10 cannot logon on Samba NT4 domain.
  • BUG #13332: winbindd: Recover loss of netlogon secure channel in case the peer DC is rebooted.
  • BUG #13363: s3:smbd: Don't use the directory cache for SMB2/3.
  • Amitay Isaacs <amitay@gmail.com>
  • BUG #13356: ctdb-client: Fix bugs in client code.
  • BUG #13359: ctdb-scripts: Drop "net serverid wipe" from 50.samba event script.
  • Lutz Justen <ljusten@google.com>
  • BUG #13368: s3: lib: messages: Don't use the result of sec_init() before calling sec_init().
  • Volker Lendecke <vl@samba.org>
  • BUG #13273: libads: Fix the build '--without-ads'.
  • BUG #13332: winbind: Keep "force_reauth" in invalidate_cm_connection, add 'smbcontrol disconnect-dc'.
  • BUG #13343: vfs_virusfilter: Fix CIDs 1428738-1428740.
  • BUG #13367: dsdb: Fix CID 1034966 Uninitialized scalar variable.
  • BUG #13370: rpc_server: Fix core dump in dfsgetinfo.
  • BUG #13382: smbclient: Fix notify.
  • Stefan Metzmacher <metze@samba.org>
  • BUG #13215: Fix smbd panic if the client-supplied channel sequence number wraps.
  • BUG #13328: Windows 10 cannot logon on Samba NT4 domain.
  • BUG #13342: lib/util: Remove unused '#include <sys/syscall.h>' from tests/tfork.c.
  • BUG #13343: Fix build errors with cc from developerstudio 12.5 on Solaris.
  • BUG #13344: Fix the picky-developer build on FreeBSD 11.
  • BUG #13345: s3:modules: Fix the build of vfs_aixacl2.c.
  • Anton Nefedov
  • BUG #13338: s3:smbd: map nterror on smb2_flush errorpath.
  • Noel Power <noel.power@suse.com>
  • BUG #13341: lib:replace: Fix linking when libtirpc-devel overwrites system headers.
  • Christof Schmitt <cs@samba.org>
  • BUG #13312: winbindd: 'wbinfo --name-to-sid' returns misleading result on invalid query.
  • Andreas Schneider <asn@samba.org>
  • BUG #13376: s3:passdb: Do not return OK if we don't have pinfo set up.
  • Eric Vannier <evannier@google.com>
  • BUG #13302: Allow AESNI to be used on all processor supporting AESNI.
https://www.samba.org/samba/history/samba-4.8.1.html

Samba 4.8.0

Release Notes for Samba 4.8.0
March 13, 2018

Release Announcements

This is the first stable release of the Samba 4.8 release series. Please read the release notes carefully before upgrading.

UPGRADING

New GUID Index mode in sam.ldb for the AD DC

Users who upgrade a Samba AD DC in-place will experience a short delay in the first startup of Samba while the sam.ldb is re-indexed.

Unlike in previous releases a transparent downgrade is not possible. If you wish to downgrade such a DB to a Samba 4.7 or earlier version, please run the source4/scripting/bin/sambaundoguididx script first.

Domain member setups require winbindd

Setups with "security = domain" or "security = ads" require a running 'winbindd' now. The fallback that smbd directly contacts domain controllers is gone.

smbclient reparse point symlink parameters reversed

See the more detailed description below.

Changed trusted domains listing with wbinfo -m --verbose

See the more detailed description below.

NEW FEATURES/CHANGES

New GUID Index mode in sam.ldb for the AD DC

The new layout used for sam.ldb is GUID, rather than DN oriented. This provides Samba's Active Directory Domain Controller with a faster database, particularly at larger scale.

The underlying DB is still TDB, simply the choice of key has changed.

The new mode is not optional, so no configuration is required. Older Samba versions cannot read the new database (see the upgrade note above).

KDC GPO application

Adds Group Policy support for the Samba kdc. Applies password policies (minimum/maximum password age, minimum password length, and password complexity) and kerberos policies (user/service ticket lifetime and renew lifetime).

Adds the samba_gpoupdate script for applying and unapplying policy. Can be applied automatically by setting

'apply group policies = yes'.

Time Machine Support with vfs_fruit

Samba can be configured as a Time Machine target for Apple Mac devices through the vfs_fruit module. When enabling a share for Time Machine support the relevant Avahi records to support discovery will be published for installations that have been built against the Avahi client library.

Shares can be designated as a Time Machine share with the following setting:

 'fruit:time machine = yes'

Support for lower casing the MDNS Name

Allows the server name that is advertised through MDNS to be set to the hostname rather than the Samba NETBIOS name. This allows an administrator to make Samba registered MDNS records match the case of the hostname rather than being in all capitals.

This can be set with the following settings:

 'mdns name = mdns'

Encrypted secrets

Attributes deemed to be sensitive are now encrypted on disk. The sensitive values are currently: pekList msDS-ExecuteScriptPassword currentValue dBCSPwd initialAuthIncoming initialAuthOutgoing lmPwdHistory ntPwdHistory priorValue supplementalCredentials trustAuthIncoming trustAuthOutgoing unicodePwd clearTextPassword

This encryption is enabled by default on a new provision or join, it can be disabled at provision or join time with the new option '--plaintext-secrets'.

However, an in-place upgrade will not encrypt the database.

Once encrypted, it is not possible to do an in-place downgrade (eg to 4.7) of the database. To obtain an unencrypted copy of the database a new DC join should be performed, specifying the '--plaintext-secrets' option.

The key file "encrypted_secrets.key" is created in the same directory as the database and should NEVER be disclosed. It is included by the samba_backup script.

Active Directory replication visualisation

To work out what is happening in a replication graph, it is sometimes helpful to use visualisations. We introduce a samba-tool subcommand to write Graphviz dot output and generate text-based heatmaps of the distance in hops between DCs.

There are two subcommands, two graphical modes, and (roughly) two modes of operation with respect to the location of authority.

  • 'samba-tool visualize ntdsconn' looks at NTDS Connections.
  • 'samba-tool visualize reps' looks at repsTo and repsFrom objects.

In '--distance' mode (default), the distances between DCs are shown in a matrix in the terminal. With '--color=yes', this is depicted as a heatmap. With '--utf8' it is a lttle prettier.

In '--dot' mode, Graphviz dot output is generated. When viewed using dot or xdot, this shows the network as a graph with DCs as vertices and connections edges. Certain types of degenerate edges are shown in different colours or line-styles.

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

Winbind changes

The dependency to global list of trusted domains within the winbindd processes has been reduced a lot.

The construction of that global list is not reliable and often incomplete in complex trust setups. In most situations the list is not needed any more for winbindd to operate correctly. E.g. for plain file serving via SMB using a simple idmap setup with autorid, tdb or ad. However some more complex setups require the list, e.g. if you specify idmap backends for specific domains. Some pam_winbind setups may also require the global list.

If you have a setup that doesn't require the global list, you should set "winbind scan trusted domains = no".

Improved support for trusted domains (as AD DC)

The support for trusted domains/forests has improved a lot.

External domain trusts, as well a transitive forest trusts, are supported in both directions (inbound and outbound) for Kerberos and NTLM authentication now.

The LSA LookupNames and LookupSids implementations support resolving names and sids from trusts domains/forest now. This is important in order to allow Samba based domain members to make use of the trust.

However there are currently still a few limitations:

  • It's not possible to add users/groups of a trusted domainvinto domain groups. So group memberships are not expanded on trust boundaries.
See https://bugzilla.samba.org/show_bug.cgi?id=13300
  • Both sides of the trust need to fully trust each other!
  • No SID filtering rules are applied at all!
  • This means DCs of domain A can grant domain admin rights in domain B.
  • Selective (CROSS_ORIGANIZATION) authentication is not supported. It's possible to create such a trust, but the KDC and winbindd ignore them.

Changed trusted domains listing with wbinfo -m --verbose

The trust properties printed by wbinfo -m --verbose have been changed to correctly reflect the view of the system where wbinfo is executed.

The trust type field in particular can show additional values that correctly reflect the type of the trust: "Local" for the local SAM and BUILTIN, "Workstation" for a workstation trust to the primary domain, "RWDC" for the SAM on a AD DC, "RODC" for the SAM on a read-only DC, "PDC" for the SAM on a NT4-style DC, "Forest" for a AD forest trust and "External" for quarantined, external or NT4-style trusts.

Indirect trusts are shown as "Routed" including the routing domain.

Example, on a AD DC (SDOM1):

Domain Name DNS Domain          Trust Type  Transitive  In   Out
BUILTIN                         Local
SDOM1       sdom1.site          RWDC
WDOM3       wdom3.site          Forest      Yes         No   Yes
WDOM2       wdom2.site          Forest      Yes         Yes  Yes
SUBDOM31    subdom31.wdom3.site Routed (via WDOM3)
SUBDOM21    subdom21.wdom2.site Routed (via WDOM2)

Same setup, on a member of WDOM2:

Domain Name DNS Domain          Trust Type  Transitive  In   Out
BUILTIN                         Local
TITAN                           Local
WDOM2       wdom2.site          Workstation Yes         No   Yes
WDOM1       wdom1.site          Routed (via WDOM2)
WDOM3       wdom3.site          Routed (via WDOM2)
SUBDOM21    subdom21.wdom2.site Routed (via WDOM2)
SDOM1       sdom1.site          Routed (via WDOM2)
SUBDOM11    subdom11.wdom1.site Routed (via WDOM2)

The list of trusts may be incomplete and additional domains may appear as "Routed" if a user of an unknown domain is successfully authenticated.

VirusFilter VFS module

This new module integrates with Sophos, F-Secure and ClamAV anti-virus software to provide scanning and filtering of files on a Samba share.

REMOVED FEATURES

'net serverid' commands removed

The two commands 'net serverid list' and 'net serverid wipe' have been removed, because the file serverid.tdb is not used anymore.

'net serverid list' can be replaced by listing all files in the subdirectory "msg.lock" of Samba's "lock directory". The unique id listed by 'net serverid list' is stored in every process' lockfile in "msg.lock".

'net serverid wipe' is not necessary anymore. It was meant primarily for clustered environments, where the serverid.tdb file was not properly cleaned up after single node crashes. Nowadays smbd and winbind take care of cleaning up the msg.lock and msg.sock directories automatically.

NT4-style replication based net commands removed

The following commands and sub-commands have been removed from the "net" utility:

  • net rpc samdump
  • net rpc vampire ldif

Also, replicating from a real NT4 domain with "net rpc vampire" and "net rpc vampire keytab" has been removed.

The NT4-based commands were accidentally broken in 2013, and nobody noticed the breakage. So instead of fixing them including tests (which would have meant writing a server for the protocols, which we don't have) we decided to remove them.

For the same reason, the "samsync", "samdeltas" and "database_redo" commands have been removed from rpcclient.

"net rpc vampire keytab" from Active Directory domains continues to be supported.

vfs_aio_linux module removed

The current Linux kernel aio does not match what Samba would do. Shipping code that uses it leads people to false assumptions. Samba implements async I/O based on threads by default, there is no special module required to see benefits of read and write request being sent do the disk in parallel.

smb.conf changes

 Parameter Name                     Description             Default
 --------------                     -----------             -------
 apply group policies               New                     no
 auth methods                       Removed
 binddns dir                        New
 client schannel                    Default changed/        yes
                                    Deprecated
 gpo update command                 New
 ldap ssl ads                       Deprecated
 map untrusted to domain            Removed
 oplock contention limit            Removed
 prefork children                   New                     1
 mdns name                          New                     netbios
 fruit:time machine                 New                     false
 profile acls                       Removed
 use spnego                         Removed
 server schannel                    Default changed/        yes
                                    Deprecated
 unicode                            Deprecated
 winbind scan trusted domains       New                     yes
 winbind trusted domains only       Removed

KNOWN ISSUES

Release_Planning_for_Samba_4.8#Release_blocking_bugs

CHANGES SINCE 4.8.0rc4

  • Jeremy Allison <jra@samba.org>
  • Ralph Boehme <slow@samba.org>
  • Stefan Metzmacher <metze@samba.org>
  • Dan Robertson <drobertson@tripwire.com>
  • BUG #13310 : libsmb: Use smb2 tcon if conn_protocol >= SMB2_02.
  • Andreas Schneider <asn@samba.org>
  • BUG #13315: s3:smbd: Do not crash if we fail to init the session table.

CHANGES SINCE 4.8.0rc3

  • Ralph Boehme <slow@samba.org>
  • BUG #13287: Fix numerous trust related bugs in winbindd and s4 LSA RPC server.
  • BUG #13296: vfs_fruit: Use off_t, not size_t for TM size calculations.
  • Alexander Bokovoy <ab@samba.org>
  • BUG #13304: mit-kdb: Support MIT Kerberos 1.16 KDB API changes.
  • Günther Deschner <gd@samba.org>
  • Poornima G <pgurusid@redhat.com>
  • BUG #13297: vfs_glusterfs: Fix the wrong pointer being sent in glfs_fsync_async.
  • Volker Lendecke <vl@samba.org>
  • Stefan Metzmacher <metze@samba.org>
  • BUG #13206: Unable to authenticate with an empty string domain .
  • BUG #13276: configure aborts without libnettle/gnutls.
  • BUG #13278: winbindd (on an AD DC) should only use netlogon/lsa against trusted domains.
  • BUG #13287: Fix numerous trust related bugs in winbindd and s4 LSA RPC server.
  • BUG #13290: A disconnecting winbind client can cause a problem in the winbind parent child communication.
  • BUG #13291: tevent: version 0.9.36.
  • BUG #13292: winbind requests could get stuck in the queue of a busy child, while later requests could get served fine by other children.
  • BUG #13293: Minimize the lifetime of winbindd_cli_state->{pw,gr}ent_state.
  • BUG #13294: Avoid using fstrcpy(domain->dcname,...) on a char *.
  • BUG #13295: winbind parent should find the dc of a foreign domain via the primary domain.
  • BUG #13299: Disable support for CROSS_ORGANIZATION domains.
  • BUG #13306: ldb: version 1.3.2.
  • Sachin Prabhu <sprabhu@redhat.com>
  • BUG #13303: vfs_glusterfs: Add fallocate support for vfs_glusterfs.
  • Garming Sam <garming@catalyst.net.nz>
  • BUG #13031: subnet: Avoid a segfault when renaming subnet objects.
  • BUG #13269: RODC may skip objects during replication due to naming conflicts.

CHANGES SINCE 4.8.0rc2

  • Trever L. Adams <trever.adams@gmail.com>
  • Ralph Boehme <slow@samba.org>
  • BUG #13228: dbcheck: Add support for restoring missing forward links.
  • Güther Deschner <gd@samba.org>
  • Stefan Metzmacher <metze@samba.org>
  • BUG #13228: dbcheck: Add support for restoring missing forward links.

CHANGES SINCE 4.8.0rc1

  • Günther Deschner <gd@samba.org>
  • BUG #13227: packaging: Fix default systemd-dir path.
  • BUG #13238: build: Deal with recent glibc sunrpc header removal.
  • Stefan Metzmacher <metze@samba.org>
  • BUG #13228: repl_meta_data: fix linked attribute corruption on databases with unsorted links on expunge.
  • Christof Schmitt <cs@samba.org>
  • BUG #13217: s3/smbd: Remove file system sharemode before calling unlink.
  • Andreas Schneider <asn@samba.org>
  • BUG #13209: Small improvements in winbindd for the resource cleanup in error cases.
  • BUG #13238: Make Samba work with tirpc and libnsl2.
https://download.samba.org/pub/samba/rc/samba-4.8.0rc3.WHATSNEW.txt