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WHATSNEW: Start release notes for Samba 4.8.0pre1.
Signed-off-by: Karolin Seeger <kseeger@samba.org> Reviewed-by: Stefan Metzmacher <metze@samba.org> Autobuild-User(master): Karolin Seeger <kseeger@samba.org> Autobuild-Date(master): Tue Jul 4 17:41:59 CEST 2017 on sn-devel-144
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WHATSNEW.txt
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WHATSNEW.txt
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Release Announcements
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=====================
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This is the first release candidate of Samba 4.7. This is *not*
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This is the first preview release of Samba 4.8. This is *not*
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intended for production environments and is designed for testing
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purposes only. Please report any defects via the Samba bug reporting
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system at https://bugzilla.samba.org/.
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Samba 4.7 will be the next version of the Samba suite.
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Samba 4.8 will be the next version of the Samba suite.
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UPGRADING
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=========
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smbclient changes
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-----------------
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smbclient no longer prints a 'Domain=[...] OS=[Windows 6.1] Server=[...]'
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banner when connecting to the first server. With SMB2 and Kerberos
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there's no way to print this information reliable. Now we avoid it at all
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consistently. In interactive session the following banner is now presented
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to the user: 'Try "help" do get a list of possible commands.'.
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The default for "client max protocol" has changed to "SMB3_11",
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which means that smbclient (and related commands) will work against
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servers without SMB1 support.
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It's possible to use the '-m/--max-protocol' option to overwrite
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the "client max protocol" option temporary.
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Note that the '-e/--encrypt' option also works with most SMB3 servers
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(e.g. Windows >= 2012 and Samba >= 4.0.0), so the SMB1 unix extensions
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are not required for encryption.
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The change to SMB3_11 as default also means smbclient no longer
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negotiates SMB1 unix extensions by default, when talking to a Samba server with
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"unix extensions = yes". As a result some commands are not available, e.g.
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posix_encrypt, posix_open, posix_mkdir, posix_rmdir, posix_unlink, posix_whoami,
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getfacl and symlink. Using "-mNT1" reenabled them, if the server supports SMB1.
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Note the default ("CORE") for "client min protocol" hasn't changed,
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so it's still possible to connect to SMB1-only servers by default.
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NEW FEATURES/CHANGES
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====================
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Whole DB read locks: Improved LDAP and replication consistency
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--------------------------------------------------------------
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Prior to Samba 4.7 and ldb 1.2.0, the LDB database layer used by Samba
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erronously did not take whole-DB read locks to protect search
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and DRS replication operations.
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While each object returned remained subject to a record-level lock (so
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would remain consistent to itself), under a race condition with a
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rename or delete, it and any links (like the member attribute) to it
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would not be returned.
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The symptoms of this issue include:
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Replication failures with this error showing in the client side logs:
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error during DRS repl ADD: No objectClass found in replPropertyMetaData for
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Failed to commit objects:
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WERR_GEN_FAILURE/NT_STATUS_INVALID_NETWORK_RESPONSE
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A crash of the server, in particular the rpc_server process with
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INTERNAL ERROR: Signal 11
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LDAP read inconsistency
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A DN subject to a search at the same time as it is being renamed
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may not appear under either the old or new name, but will re-appear
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for a subsequent search.
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See https://bugzilla.samba.org/show_bug.cgi?id=12858 for more details
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and updated advise on database recovery for affected installations.
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Samba AD with MIT Kerberos
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--------------------------
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After four years of development, Samba finally supports compiling and
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running Samba AD with MIT Kerberos. You can enable it with:
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./configure --with-system-mitkrb5
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Samba requires version 1.15.1 of MIT Kerberos to build with AD DC support.
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The krb5-devel and krb5-server packages are required.
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The feature set is not on par with with the Heimdal build but the most important
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things, like forest and external trusts, are working. Samba uses the KDC binary
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provided by MIT Kerberos.
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Missing features, compared to Heimdal, are:
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* PKINIT support
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* S4U2SELF/S4U2PROXY support
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* RODC support (not fully working with Heimdal either)
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The Samba AD process will take care of starting the MIT KDC and it will load a
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KDB (Kerberos Database) driver to access the Samba AD database. When
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provisioning an AD DC using 'samba-tool' it will take care of creating a correct
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kdc.conf file for the MIT KDC. Note that 'samba-tool' will overwrite the system
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kdc.conf by default. It is possible to use a different location during
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provision. You should consult the 'samba-tool' help and smb.conf manpage for
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details.
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Dynamic RPC port range
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----------------------
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The dynamic port range for RPC services has been changed from the old default
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value 1024-1300 to 49152-65535. This port range is not only used by a
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Samba AD DC but also applies to all other server roles including NT4-style
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domain controllers. The new value has been defined by Microsoft in Windows
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Server 2008 and newer versions. To make it easier for Administrators to control
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those port ranges we use the same default and make it configurable with the
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option: 'rpc server dynamic port range'.
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The 'rpc server port' option sets the first available port from the new
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'rpc server dynamic port range' option. The option 'rpc server port' only
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applies to Samba provisioned as an AD DC.
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Authentication and Authorization audit support
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----------------------------------------------
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Detailed authentication and authorization audit information is now
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logged to Samba's debug logs under the "auth_audit" debug class,
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including in particular the client IP address triggering the audit
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line. Additionally, if Samba is compiled against the jansson JSON
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library, a JSON representation is logged under the "auth_json_audit"
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debug class.
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Audit support is comprehensive for all authentication and
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authorisation of user accounts in the Samba Active Directory Domain
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Controller, as well as the implicit authentication in password
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changes. In the file server and classic/NT4 domain controller, NTLM
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authentication, SMB and RPC authorization is covered, however password
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changes are not at this stage, and this support is not currently
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backed by a testsuite.
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Multi-process LDAP Server
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-------------------------
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The LDAP server in the AD DC now honours the process model used for
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the rest of the samba process, rather than being forced into a single
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process. This aids in Samba's ability to scale to larger numbers of AD
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clients and the AD DC's overall resiliency, but will mean that there is a
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fork()ed child for every LDAP client, which may be more resource
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intensive in some situations.
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Improved Read-Only Domain Controller (RODC) Support
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---------------------------------------------------
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Support for RODCs in Samba AD until now has been experimental. With this latest
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version, many of the critical bugs have been fixed and the RODC can be used in
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DC environments requiring no writable behaviour. RODCs now correctly support
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bad password lockouts and password disclosure auditing through the
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msDS-RevealedUsers attribute.
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The fixes made to the RWDC will also allow Windows RODC to function more
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correctly and to avoid strange data omissions such as failures to replicate
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groups or updated passwords. Password changes are currently rejected at the
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RODC, although referrals should be given over LDAP. While any bad passwords can
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trigger domain-wide lockout, good passwords which have not been replicated yet
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for a password change can only be used via NTLM on the RODC (and not Kerberos).
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The reliability of RODCs locating a writable partner still requires some
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improvements and so the 'password server' configuration option is generally
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recommended on the RODC.
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Additional password hashes stored in supplementalCredentials
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------------------------------------------------------------
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A new config option 'password hash userPassword schemes' has been added to
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enable generation of SHA-256 and SHA-512 hashes (without storing the plaintext
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password with reversible encryption). This builds upon previous work to improve
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password sync for the AD DC (originally using GPG).
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The user command of 'samba-tool' has been updated in order to be able to
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extract these additional hashes, as well as extracting the (HTTP) WDigest
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hashes that we had also been storing in supplementalCredentials.
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Improvements to DNS during Active Directory domain join
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-------------------------------------------------------
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The 'samba-tool' domain join command will now add the A and GUID DNS records
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(on both the local and remote servers) during a join if possible via RPC. This
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should allow replication to proceed more smoothly post-join.
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The mname element of the SOA record will now also be dynamically generated to
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point to the local read-write server. 'samba_dnsupdate' should now be more
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reliable as it will now find the appropriate name server even when resolv.conf
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points to a forwarder.
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Significant AD performance and replication improvements
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-------------------------------------------------------
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Previously, replication of group memberships was been an incredibly expensive
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process for the AD DC. This was mostly due to unnecessary CPU time being spent
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parsing member linked attributes. The database now stores these linked
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attributes in sorted form to perform efficient searches for existing members.
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In domains with a large number of group memberships, a join can now be
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completed in half the time compared with Samba 4.6.
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LDAP search performance has also improved, particularly in the unindexed search
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case. Parsing and processing of security descriptors should now be more
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efficient, improving replication but also overall performance.
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Query record for open file or directory
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---------------------------------------
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The record attached to an open file or directory in Samba can be
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queried through the 'net tdb locking' command. In clustered Samba this
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can be useful to determine the file or directory triggering
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corresponding "hot" record warnings in ctdb.
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Removal of lpcfg_register_defaults_hook()
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-----------------------------------------
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The undocumented and unsupported function lpcfg_register_defaults_hook()
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that was used by external projects to call into Samba and modify
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smb.conf default parameter settings has been removed. If your project
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was using this call please raise the issue on
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samba-technical@lists.samba.org in order to design a supported
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way of obtaining the same functionality.
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Change of loadable module interface
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-----------------------------------
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The _init function of all loadable modules in Samba has changed
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from:
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NTSTATUS _init(void);
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to:
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NTSTATUS _init(TALLOC_CTX *);
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This allows a program loading a module to pass in a long-lived
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talloc context (which must be guaranteed to be alive for the
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lifetime of the module). This allows modules to avoid use of
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the talloc_autofree_context() (which is inherently thread-unsafe)
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and still be valgrind-clean on exit. Modules that don't need to
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free long-lived data on exit should use the NULL talloc context.
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Parameter changes
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-----------------
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The "strict sync" global parameter has been changed from
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a default of "no" to "yes". This means smbd will by default
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obey client requests to synchronize unwritten data in operating
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system buffers safely onto disk. This is a safer default setting
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for modern SMB1/2/3 clients.
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The 'ntlm auth' option default is renamed to 'ntlmv2-only', reflecting
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the previous behaviour. Two new values have been provided,
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'mschapv2-and-ntlmv2-only' (allowing MSCHAPv2 while denying NTLMv1)
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and 'disabled', totally disabling NTLM authentication and password
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changes.
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smb.conf changes
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================
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Parameter Name Description Default
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-------------- ----------- -------
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allow unsafe cluster upgrade New parameter no
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auth event notification New parameter no
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auth methods Deprecated
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client max protocol Effective SMB3_11
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default changed
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map untrusted to domain New value/ auto
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Default changed/
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Deprecated
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mit kdc command New parameter
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profile acls Deprecated
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rpc server dynamic port range New parameter 49152-65535
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strict sync Default changed yes
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password hash userPassword schemes New parameter
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ntlm auth New values ntlmv2-only
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KNOWN ISSUES
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============
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https://wiki.samba.org/index.php/Release_Planning_for_Samba_4.7#Release_blocking_bugs
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https://wiki.samba.org/index.php/Release_Planning_for_Samba_4.8#Release_blocking_bugs
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#######################################
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