============================= Release Notes for Samba 4.5.3 December 19, 2016 ============================= This is a security release in order to address the following defects: o CVE-2016-2123 (Samba NDR Parsing ndr_pull_dnsp_name Heap-based Buffer Overflow Remote Code Execution Vulnerability). o CVE-2016-2125 (Unconditional privilege delegation to Kerberos servers in trusted realms). o CVE-2016-2126 (Flaws in Kerberos PAC validation can trigger privilege elevation). ======= Details ======= o CVE-2016-2123: The Samba routine ndr_pull_dnsp_name contains an integer wrap problem, leading to an attacker-controlled memory overwrite. ndr_pull_dnsp_name parses data from the Samba Active Directory ldb database. Any user who can write to the dnsRecord attribute over LDAP can trigger this memory corruption. By default, all authenticated LDAP users can write to the dnsRecord attribute on new DNS objects. This makes the defect a remote privilege escalation. o CVE-2016-2125 Samba client code always requests a forwardable ticket when using Kerberos authentication. This means the target server, which must be in the current or trusted domain/realm, is given a valid general purpose Kerberos "Ticket Granting Ticket" (TGT), which can be used to fully impersonate the authenticated user or service. o CVE-2016-2126 A remote, authenticated, attacker can cause the winbindd process to crash using a legitimate Kerberos ticket due to incorrect handling of the arcfour-hmac-md5 PAC checksum. A local service with access to the winbindd privileged pipe can cause winbindd to cache elevated access permissions. Changes since 4.5.2: -------------------- o Volker Lendecke * BUG 12409: CVE-2016-2123: Fix DNS vuln ZDI-CAN-3995. o Stefan Metzmacher * BUG 12445: CVE-2016-2125: Don't send delegated credentials to all servers. * BUG 12446: CVE-2016-2126: auth/kerberos: Only allow known checksum types in check_pac_checksum(). ####################################### 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 4.5.2 December 07, 2016 ============================= This is the latest stable release of the Samba 4.5 release series. Changes since 4.5.1: -------------------- o Michael Adam * BUG 12404: vfs:glusterfs: Preallocate result for glfs_realpath. o Jeremy Allison * BUG 12384: s3: vfs: Remove files/directories after the streams are deleted. * BUG 12387: s3: vfs_streams_depot: Use conn->connectpath not conn->cwd. * BUG 12436: s3/smbd: Fix the last resort check that sets the file type attribute. o Andrew Bartlett * BUG 9954: dsdb: Create RID Set as SYSTEM. * BUG 12297: dbcheck: Correct message for orphaned backlinks. * BUG 12395: build: Fix build with perl on debian sid. * BUG 12398: Fix errors in extended operations (like allocating a RID Set). o Günther Deschner * BUG 11197: spoolss: Use correct values for secdesc and devmode pointers. o Clive Ferreira * BUG 12394: objectclass_attrs: Only abort on a missing attribute when an attribute is both MUST and replicated. o Amitay Isaacs * BUG 12366: provision,dlz-bind: Add support for BIND 9.11.x. * BUG 12392: ctdb-locking: Reset real-time priority in lock helper. * BUG 12407: ctdb-scripts: Fix calculation of CTDB_BASE. * BUG 12434: ctdb-recovery: Avoid NULL dereference in failure case. o Stefan Metzmacher * BUG 10297: s3:smbd: Only pass UCF_PREP_CREATEFILE to filename_convert() if we may create a new file. o Mathieu Parent * BUG 12371: ctdb-scripts: Fix Debian init in samba eventscript. o Garming Sam * BUG 9954: samba_tool/fsmo: Allocate RID Set when seizing RID manager. * BUG 10882: s4-auth: Don't check for NULL saltPrincipal if it doesn't need it. * BUG 12297: upgradeprovision: Remove objectCategory from constructed attrs. * BUG 12385: collect_tombstones: Allow links to recycled objects to be deleted. o Andreas Schneider * BUG 12183: s3-printing: Correctly encode CUPS printer URIs. * BUG 12195: s3-printing: Allow printer names longer than 16 chars. * BUG 12269: nss_wins: Fix errno values for HOST_NOT_FOUND. * BUG 12405: s3-winbind: Do not return NO_MEMORY if we have an empty user list. * BUG 12415: s3:spoolss: Add support for COPY_FROM_DIRECTORY in AddPrinterDriverEx. o Martin Schwenke * BUG 12104: ctdb-packaging: Move CTDB tests to /usr/local/share/ctdb/tests/. o Uri Simchoni * BUG 12375: smbd: In ntlm auth, do not map empty domain in case of \user@realm. o Ralph Wuerthner * BUG 12372: ctdb-conn: Add missing variable initialization. ####################################### 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 4.5.1 October 26, 2016 ============================= This is the latest stable release of the Samba 4.5 release series. Major enhancements in Samba 4.5.1 include: o Let winbindd discard expired kerberos tickets when built against (internal) heimdal (BUG #12369). o REGRESSION: smbd segfaults on startup, tevent context being freed (BUG #12283). Changes since 4.5.0: -------------------- o Jeremy Allison * BUG 11259: smbd contacts a domain controller for each session. * BUG 12272: Fix messaging subsystem crash. * BUG 12283: REGRESSION: smbd segfaults on startup, tevent context being freed. * BUG 12381: s3: cldap: cldap_multi_netlogon_send() fails with one bad IPv6 address. * BUG 12383: s3: libsmb: Fix cut and paste error using the wrong structure type. o Christian Ambach * BUG 9945: Setting specific logger levels in smb.conf makes 'samba-tool drs showrepl' crash. o Andrew Bartlett * BUG 12382: Tombstone expunge does not remove old links. o Björn Baumbach * BUG 8618: s3-printing: Fix migrate printer code. o Ralph Boehme * BUG 12256: s3/smbd: In call_trans2qfilepathinfo call lstat when dealing with posix pathnames. * BUG 12261: s3/smbd: Set FILE_ATTRIBUTE_DIRECTORY as necessary. o Günther Deschner * BUG 12285: "DriverVersion" registry backend parsing incorrect in spoolss. o David Disseldorp * BUG 12144: smbd/ioctl: Match WS2016 ReFS get compression behaviour. o Amitay Isaacs * BUG 12259: ctdb-protocol: Fix marshalling for GET_DB_SEQNUM control request. * BUG 12275: ctdb-recovery-helper: Add missing initialisation of ban_credits. * BUG 12287: CTDB PID file handling is too weak. o Volker Lendecke * BUG 12045: gencache: Bail out of stabilize if we can not get the allrecord lock. * BUG 12268: smbd: Reset O_NONBLOCK on open files. * BUG 12283: glusterfs: Avoid tevent_internal.h. * BUG 12291: source3/lib/msghdr.c, line 208: syntax error before or at: ;. * BUG 12374: spoolss: Fix caching of printername->sharename. o Stefan Metzmacher * BUG 12283: REGRESSION: smbd segfaults on startup, tevent context being freed. * BUG 12369: Let winbindd discard expired kerberos tickets when built against (internal) heimdal. o Noel Power * BUG 12298: s3/winbindd: Fix using default domain with user@domain.com format. o Christof Schmitt * BUG 12295: winbind: Fix passing idmap failure from wb_sids2xids back to callers. o Andreas Schneider * BUG 12269: nss_wins has incorrect function definitions for gethostbyname*. * BUG 12276: s3-lib: Fix %G substitution in AD member environment. * BUG 12364: s3-utils: Fix loading smb.conf in smbcquotas. o Garming Sam * BUG 12286: kcc: Don't check schedule if None. * BUG 12382: Tombstone expunge does not remove old links. o Anoop C S * BUG 12377: vfs_glusterfs: Fix a memory leak in connect path. o Martin Schwenke * BUG 12254: CTDB IP takeover does not complete if there are no public addresses configured. * BUG 12255: ctdb-packaging: Fix systemd network dependency. * BUG 12287: CTDB PID file handling is too weak. o Uri Simchoni * BUG 12270: smbcquotas: Fix error message listing quotas. * BUG 12273: s3-sysquotas: Correctly restore path when finding mount point. * BUG 12288: cliquota: Fix param count when setting fs quota. * BUG 12289: smbd: Free talloc context if no quota records are available. * BUG 12307: ntquotas: Support "freeing" an empty quota list. ####################################### 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 4.5.0 September 7, 2016 ============================= This is the first stable release of the Samba 4.5 release series. UPGRADING ========= NTLMv1 authentication disabled by default ----------------------------------------- In order to improve security we have changed the default value for the "ntlm auth" option from "yes" to "no". This may have impact on very old clients which doesn't support NTLMv2 yet. The primary user of NTLMv1 is MSCHAPv2 for VPNs and 802.1x. By default, Samba will only allow NTLMv2 via NTLMSSP now, as we have the following default "lanman auth = no", "ntlm auth = no" and "raw NTLMv2 auth = no". NEW FEATURES/CHANGES ==================== Support for LDAP_SERVER_NOTIFICATION_OID ---------------------------------------- The ldap server has support for the LDAP_SERVER_NOTIFICATION_OID control. This can be used to monitor the Active Directory database for changes. KCC improvements for sparse network replication ----------------------------------------------- The Samba KCC will now be the default knowledge consistency checker in Samba AD. Instead of using full mesh replication between every DC, the KCC will set up connections to optimize replication latency and cost (using site links to calculate the routes). This change should allow larger domains to function significantly better in terms of replication traffic and the time spent performing DRS replication. VLV - Virtual List View ----------------------- The VLV Control allows applications to page the LDAP directory in the way you might expect a live phone book application to operate, without first downloading the entire directory. DRS Replication for the AD DC ----------------------------- DRS Replication in Samba 4.5 is now much more efficient in handling linked attributes, particularly in large domains with over 1000 group memberships or other links. Replication is also much more reliable in the handling of tree renames, such as the rename of an organizational unit containing many users. Extensive tests have been added to ensure this code remains reliable, particularly in the case of conflicts between objects added with the same name on different servers. Schema updates are also handled much more reliably. samba-tool drs replicate with new options ----------------------------------------- 'samba-tool drs replicate' got two new options: The option '--local-online' will do the DsReplicaSync() via IRPC to the local dreplsrv service. The option '--async-op' will add DRSUAPI_DRS_ASYNC_OP to the DsReplicaSync(), which won't wait for the replication result. replPropertyMetaData Changes ---------------------------- During the development of the DRS replication, tests showed that Samba stores the replPropertyMetaData object incorrectly. To address this, be aware that 'dbcheck' will now detect and offer to fix all objects in the domain for this error. For further information and instructions how to fix the problem, see https://wiki.samba.org/index.php/Updating_Samba#Fixing_replPropertyMetaData_Attributes Linked attributes on deleted objects ------------------------------------ In Active Directory, an object that has been tombstoned or recycled has no linked attributes. However, Samba incorrectly maintained such links, slowing replication and run-time performance. 'dbcheck' now offers to remove such links, and they are no longer kept after the object is tombstoned or recycled. Improved AD DC performance -------------------------- Many other improvements have been made to our LDAP database layer in the AD DC, to improve performance, both during 'samba-tool domain provision' and at runtime. Other dbcheck improvements -------------------------- - 'samba-tool dbcheck' can now find and fix a missing or corrupted 'deleted objects' container. - BUG 11433: samba-dbcheck no longer offers to resort auxiliary class values in objectClass as these were then re-sorted at the next dbcheck indefinitely. Tombstone Reanimation --------------------- Samba now supports tombstone reanimation, a feature in the AD DC allowing tombstones, that is objects which have been deleted, to be restored with the original SID and GUID still in place. Multiple DNS Forwarders on the AD DC ------------------------------------ Previously, the Samba internal DNS server supported only one DNS forwarder. The "dns forwarder" option has been enhanced and now supports a space-separated list of multiple DNS server IP addresses. As a result, Samba is now able to fall back to alternative DNS servers. In case that a DNS query to the first server timed out, it is sent to the next DNS server listed in the option. Password quality plugin support in the AD DC -------------------------------------------- The check password script now operates correctly in the AD DC. pwdLastSet is now correctly honoured ------------------------------------ BUG 9654: The pwdLastSet attribute is now correctly handled (this previously permitted passwords that expire next). net ads dns unregister ---------------------- It is now possible to remove the DNS entries created with 'net ads register' with the matching 'net ads unregister' command. samba-tool improvements ------------------------ Running 'samba-tool' on the command line should now be a lot snappier. The tool now only loads the code specific to the subcommand that you wish to run. SMB 2.1 Leases enabled by default --------------------------------- Leasing is an SMB 2.1 (and higher) feature which allows clients to aggressively cache files locally above and beyond the caching allowed by SMB 1 oplocks. This feature was disabled in previous releases, but the SMB2 leasing code is now considered mature and stable enough to be enabled by default. Open File Description (OFD) Locks --------------------------------- On systems that support them (currently only Linux), the fileserver now uses Open File Description (OFD) locks instead of POSIX locks to implement client byte range locks. As these locks are associated with a specific file descriptor on a file this allows more efficient use when multiple descriptors having file locks are opened onto the same file. An internal tunable "smbd:force process locks = true" may be used to turn off OFD locks if there appear to be problems with them. Password sync as Active Directory domain controller --------------------------------------------------- The new commands 'samba-tool user getpassword' and 'samba-tool user syncpasswords' provide access and syncing of various password fields. If compiled with GPGME support (--with-gpgme) it's possible to store cleartext passwords in a PGP/OpenGPG encrypted form by configuring the new "password hash gpg key ids" option. This requires gpgme devel and python packages to be installed (e.g. libgpgme11-dev and python-gpgme on Debian/Ubuntu). Python crypto requirements -------------------------- Some 'samba-tool' subcommands require python-crypto and/or python-m2crypto packages to be installed. SmartCard/PKINIT improvements ----------------------------- 'samba-tool user create' accepts "--smartcard-required" and 'samba-tool user setpassword' accepts "--smartcard-required" and "--clear-smartcard-required". Specifying "--smartcard-required" results in the UF_SMARTCARD_REQUIRED flags being set in the userAccountControl attribute. At the same time, the account password is reset to a random NTHASH value. Interactive password logons are rejected, if the UF_SMARTCARD_REQUIRED bit is set in the userAccountControl attribute of a user. When doing a PKINIT based Kerberos logon the KDC adds the required PAC_CREDENTIAL_INFO element to the authorization data. That means the NTHASH is shared between the PKINIT based client and the domain controller, which allows the client to do NTLM based authentication on behalf of the user. It also allows an offline logon using a smartcard to work on Windows clients. CTDB changes ------------ * New improved 'ctdb tool' 'ctdb tool' has been completely rewritten using new client API. Usage messages are much improved. * Sample CTDB configuration file is installed as ctdbd.conf. * The use of real-time scheduling when taking locks has been narrowed to limit potential performance impacts on nodes. * CTDB_RECOVERY_LOCK now supports specification of an external helper to take and hold the recovery lock. See the RECOVERY LOCK section in ctdb(7) for details. Documentation for writing helpers is provided in doc/cluster_mutex_helper.txt. * "ctdb natgwlist" has been replaced by a top level "ctdb natgw" command that has "master", "list" and "status" subcommands. * The 'onnode' command no longer supports the "recmaster", "lvs" and "natgw" node specifications. * Faster resetting of TCP connections to public IP addresses during failover. * Tunables MaxRedirectCount, ReclockPingPeriod, DeferredRebalanceOnNodeAdd are now obsolete/ignored. * "ctdb listvars" now lists all variables, including the first one. * "ctdb xpnn", "ctdb rebalanceip" and "ctdb rebalancenode" have been removed. These are not needed because "ctdb reloadips" should do the correct rebalancing. * Output for the following commands has been simplified: ctdb getdbseqnum ctdb getdebug ctdb getmonmode ctdb getpid ctdb getreclock ctdb getpid ctdb pnn These now simply print the requested output with no preamble. This means that scripts no longer need to strip part of the output. "ctdb getreclock" now prints nothing when the recovery lock is not set. * Output for the following commands has been improved: ctdb setdebug ctdb uptime * 'ctdb process-exists' has been updated to only take a PID argument. The PNN can be specified with -n . Output also cleaned up. * LVS support has been reworked - related commands and configuration variables have changed. 'ctdb lvsmaster' and 'ctdb lvs' have been replaced by a top level 'ctdb lvs' command that has 'master', 'list' and 'status' subcommands. See the LVS sections in ctdb(7) and ctdbd.conf(5) for details, including configuration changes. * Improved sample NFS Ganesha call-out. New shadow_copy2 options ------------------------ * shadow:snapprefix With growing number of snapshots file-systems need some mechanism to differentiate one set of snapshots from other, e.g. monthly, weekly, manual, special events, etc. Therefore, these file-systems provide different ways to tag snapshots, e.g. provide a configurable way to name snapshots, which is not just based on time. With only shadow:format it is very difficult to filter these snapshots. With this optional parameter, one can specify a variable prefix component for names of the snapshot directories in the file-system. If this parameter is set, together with the shadow:format and shadow:delimiter parameters it determines the possible names of snapshot directories in the file-system. The option only supports Basic Regular Expression (BRE). * shadow:delimiter This optional parameter is used as a delimiter between "shadow:snapprefix" and "shadow:format". This parameter is used only when "shadow:snapprefix" is set. Default: shadow:delimiter = "_GMT" REMOVED FEATURES ================ "only user" and "username" parameters ------------------------------------- These two parameters have long been deprecated and superseded by "valid users" and "invalid users". smb.conf changes ================ Parameter Name Description Default -------------- ----------- ------- kccsrv:samba_kcc Changed default yes ntlm auth Changed default no only user Removed password hash gpg key ids New shadow:snapprefix New shadow:delimiter New _GMT smb2 leases Changed default yes username Removed KNOWN ISSUES ============ While a lot of schema replication bugs were fixed in this release Bug 12204 - Samba fails to replicate schema 69 (https://bugzilla.samba.org/show_bug.cgi?id=12204) is still open. The replication fails if more than 133 schema objects are added at the same time. More open bugs are listed at: https://wiki.samba.org/index.php/Release_Planning_for_Samba_4.5#All_bugs CHANGES SINCE 4.5.0rc3 ====================== o Björn Baumbach * BUG 12194: idmap_script: fix missing "IDTOSID" argument in scripts command line. o Andrew Bartlett * BUG 12178: samba-tool dbcheck fails to fix replPropertyMetaData. o Ralph Boehme * BUG 12177: Unexpected synthesized default ACL from vfs_acl_xattr. * BUG 12181: vfs_acl_common not setting filesystem permissions anymore. * BUG 12184: Loading shared RPC modules failed. o Günther Deschner * BUG 12245: fix _spoolss_GetPrinterDataEx by moving the keyname length check. o Stefan Metzmacher * BUG 11994: smbclient fails to connect to Azure or Apple share spnego fails with no mechListMIC. o Martin Schwenke * BUG 12180: CTDB crashes running eventscripts. CHANGES SINCE 4.5.0rc2 ====================== o Michael Adam * BUG 12155: Some idmap backends don't perform range checks for the result of sids_to_xids. o Jeremy Allison * BUG 12115: Endless loop on drsuapi pull replication after schema changes. * BUG 12135: net ads gpo refresh can crash with null pointer deref.. * BUG 12139: Race between break oplock and check for share_mode. * BUG 12150: SMB2 snapshot query fails on DFS shares.. * BUG 12165: smbclient allinfo doesn't correctly return 'previous version' info over SMB1. * BUG 12166: smbclient allinfo doesn't correctly return 'previous version' info over SMB2. * BUG 12174: error: 'conn' undeclared. o Douglas Bagnall * BUG 12143: misnamed attribute in samba_kcc causes exception in unusual circumstances. * BUG 12187: Backport changes for partial attribute set calculation for 4.5. o Andrew Bartlett * BUG 12107: backport backupkey tests. * BUG 12115: Endless loop on drsuapi pull replication after schema changes. * BUG 12128: Correctly resolve replicated schema changes regarding linked attributes. o Amitay Isaacs * BUG 12137: Fix printf format non-liternal warnings and printf format errors. * BUG 12138: Fix uninitialized timeout in ctdb_pmda. * BUG 12151: Drop resurrected ctdb commands in new ctdb tool. * BUG 12152: Fix ctdb addip; implementation to match ctdb delip. * BUG 12163: Fix missing arguments and format elements in format strings. * BUG 12168: Fix format-nonliteral warnings. o Stefan Metzmacher * BUG 12108: Backport selftest/autobuild fixes to v4-5-test. * BUG 12114: In memory schema updated on non schema master. * BUG 12115: Endless loop on drsuapi pull replication after schema changes. * BUG 12128: Correctly resolve replicated schema changes regarding linked attributes. * BUG 12129: let samba-tool ldapcmp ignore whenChanged. o Garming Sam * BUG 12187: Backport changes for partial attribute set calculation for 4.5. o Andreas Schneider * BUG 12175: smbget always prompts for a username. o Christof Schmitt * BUG 12150: SMB2 snapshot query fails on DFS shares.. o Martin Schwenke * BUG 12157: Coverity and related fixes. * BUG 12158: CTDB release IP fixes. * BUG 12161: Fix CTDB cumulative takeover timeout. * BUG 12170: CTDB test runs can kill each other's ctdbd daemons. o Uri Simchoni * BUG 12145: smbd: if inherit owner is enabled, the free disk on a folder should take the owner's quota into account. * BUG 12149: smbd: cannot load a Windows device driver from a Samba share via SMB2. * BUG 12172: a snapshot folder cannot be accessed via SMB1. CHANGES SINCE 4.5.0rc1 ====================== o Ralph Boehme * BUG 12005: parse_share_modes() chokes on ctdb tombstone record from ltdb. * BUG 12105: smbclient connection to not reachable IP eats 100% CPU. o Ira Cooper * BUG 12133: source3/wscript: Add support for disabling vfs_cephfs. o Amitay Isaacs * BUG 12121: ctdb-tools: Fix numerous Coverity IDs and other issues. * BUG 12122: If a transaction fails, it should be canceled and transaction handle should be freed. * BUG 12134: dbwrap: Fix structure initialization. o Marc Muehlfeld * BUG 12023: man: Fix wrong option for parameter "ldap ssl" in smb.conf man page. o Andreas Schneider * BUG 12104: ctdb-waf: Move ctdb tests to libexec directory. o Martin Schwenke * BUG 12104: ctdb-packaging: Move ctdb tests to libexec directory. * BUG 12109: Fixes several CTDB tests. * BUG 12110: Fix numerous Coverity IDs. * BUG 12113: ctdb-mutex: Avoid corner case where helper is already reparented to init. * BUG 12123: Fix ctdb tickle command and update documentation. * BUG 12125: CTDB overwrites working configuration due to packaging change. * BUG 12126: Fix broken CTDB log messages. ####################################### 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 ======================================================================