From e317dfeccf191d849656dde2238e477fb5e666d7 Mon Sep 17 00:00:00 2001 From: Karolin Seeger Date: Mon, 3 Jul 2017 12:09:53 +0200 Subject: [PATCH] WHATSNEW: Start release notes for Samba 4.8.0pre1. Signed-off-by: Karolin Seeger Reviewed-by: Stefan Metzmacher Autobuild-User(master): Karolin Seeger Autobuild-Date(master): Tue Jul 4 17:41:59 CEST 2017 on sn-devel-144 --- WHATSNEW.txt | 259 +-------------------------------------------------- 1 file changed, 3 insertions(+), 256 deletions(-) diff --git a/WHATSNEW.txt b/WHATSNEW.txt index 8ef5428d9f3..52cca7d669d 100644 --- a/WHATSNEW.txt +++ b/WHATSNEW.txt @@ -1,286 +1,33 @@ Release Announcements ===================== -This is the first release candidate of Samba 4.7. This is *not* +This is the first preview release of Samba 4.8. 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 4.7 will be the next version of the Samba suite. +Samba 4.8 will be the next version of the Samba suite. UPGRADING ========= -smbclient changes ------------------ - -smbclient no longer prints a 'Domain=[...] OS=[Windows 6.1] Server=[...]' -banner when connecting to the first server. With SMB2 and Kerberos -there's no way to print this information reliable. Now we avoid it at all -consistently. In interactive session the following banner is now presented -to the user: 'Try "help" do get a list of possible commands.'. - -The default for "client max protocol" has changed to "SMB3_11", -which means that smbclient (and related commands) will work against -servers without SMB1 support. - -It's possible to use the '-m/--max-protocol' option to overwrite -the "client max protocol" option temporary. - -Note that the '-e/--encrypt' option also works with most SMB3 servers -(e.g. Windows >= 2012 and Samba >= 4.0.0), so the SMB1 unix extensions -are not required for encryption. - -The change to SMB3_11 as default also means smbclient no longer -negotiates SMB1 unix extensions by default, when talking to a Samba server with -"unix extensions = yes". As a result some commands are not available, e.g. -posix_encrypt, posix_open, posix_mkdir, posix_rmdir, posix_unlink, posix_whoami, -getfacl and symlink. Using "-mNT1" reenabled them, if the server supports SMB1. - -Note the default ("CORE") for "client min protocol" hasn't changed, -so it's still possible to connect to SMB1-only servers by default. - NEW FEATURES/CHANGES ==================== -Whole DB read locks: Improved LDAP and replication consistency --------------------------------------------------------------- - -Prior to Samba 4.7 and ldb 1.2.0, the LDB database layer used by Samba -erronously did not take whole-DB read locks to protect search -and DRS replication operations. - -While each object returned remained subject to a record-level lock (so -would remain consistent to itself), under a race condition with a -rename or delete, it and any links (like the member attribute) to it -would not be returned. - -The symptoms of this issue include: - -Replication failures with this error showing in the client side logs: - error during DRS repl ADD: No objectClass found in replPropertyMetaData for - Failed to commit objects: - WERR_GEN_FAILURE/NT_STATUS_INVALID_NETWORK_RESPONSE - -A crash of the server, in particular the rpc_server process with - INTERNAL ERROR: Signal 11 - -LDAP read inconsistency - A DN subject to a search at the same time as it is being renamed - may not appear under either the old or new name, but will re-appear - for a subsequent search. - -See https://bugzilla.samba.org/show_bug.cgi?id=12858 for more details -and updated advise on database recovery for affected installations. - - -Samba AD with MIT Kerberos --------------------------- - -After four years of development, Samba finally supports compiling and -running Samba AD with MIT Kerberos. You can enable it with: - - ./configure --with-system-mitkrb5 - -Samba requires version 1.15.1 of MIT Kerberos to build with AD DC support. -The krb5-devel and krb5-server packages are required. -The feature set is not on par with with the Heimdal build but the most important -things, like forest and external trusts, are working. Samba uses the KDC binary -provided by MIT Kerberos. - -Missing features, compared to Heimdal, are: - * PKINIT support - * S4U2SELF/S4U2PROXY support - * RODC support (not fully working with Heimdal either) - -The Samba AD process will take care of starting the MIT KDC and it will load a -KDB (Kerberos Database) driver to access the Samba AD database. When -provisioning an AD DC using 'samba-tool' it will take care of creating a correct -kdc.conf file for the MIT KDC. Note that 'samba-tool' will overwrite the system -kdc.conf by default. It is possible to use a different location during -provision. You should consult the 'samba-tool' help and smb.conf manpage for -details. - -Dynamic RPC port range ----------------------- - -The dynamic port range for RPC services has been changed from the old default -value 1024-1300 to 49152-65535. This port range is not only used by a -Samba AD DC but also applies to all other server roles including NT4-style -domain controllers. The new value has been defined by Microsoft in Windows -Server 2008 and newer versions. To make it easier for Administrators to control -those port ranges we use the same default and make it configurable with the -option: 'rpc server dynamic port range'. - -The 'rpc server port' option sets the first available port from the new -'rpc server dynamic port range' option. The option 'rpc server port' only -applies to Samba provisioned as an AD DC. - -Authentication and Authorization audit support ----------------------------------------------- - -Detailed authentication and authorization audit information is now -logged to Samba's debug logs under the "auth_audit" debug class, -including in particular the client IP address triggering the audit -line. Additionally, if Samba is compiled against the jansson JSON -library, a JSON representation is logged under the "auth_json_audit" -debug class. - -Audit support is comprehensive for all authentication and -authorisation of user accounts in the Samba Active Directory Domain -Controller, as well as the implicit authentication in password -changes. In the file server and classic/NT4 domain controller, NTLM -authentication, SMB and RPC authorization is covered, however password -changes are not at this stage, and this support is not currently -backed by a testsuite. - -Multi-process LDAP Server -------------------------- - -The LDAP server in the AD DC now honours the process model used for -the rest of the samba process, rather than being forced into a single -process. This aids in Samba's ability to scale to larger numbers of AD -clients and the AD DC's overall resiliency, but will mean that there is a -fork()ed child for every LDAP client, which may be more resource -intensive in some situations. - -Improved Read-Only Domain Controller (RODC) Support ---------------------------------------------------- - -Support for RODCs in Samba AD until now has been experimental. With this latest -version, many of the critical bugs have been fixed and the RODC can be used in -DC environments requiring no writable behaviour. RODCs now correctly support -bad password lockouts and password disclosure auditing through the -msDS-RevealedUsers attribute. - -The fixes made to the RWDC will also allow Windows RODC to function more -correctly and to avoid strange data omissions such as failures to replicate -groups or updated passwords. Password changes are currently rejected at the -RODC, although referrals should be given over LDAP. While any bad passwords can -trigger domain-wide lockout, good passwords which have not been replicated yet -for a password change can only be used via NTLM on the RODC (and not Kerberos). - -The reliability of RODCs locating a writable partner still requires some -improvements and so the 'password server' configuration option is generally -recommended on the RODC. - -Additional password hashes stored in supplementalCredentials ------------------------------------------------------------- - -A new config option 'password hash userPassword schemes' has been added to -enable generation of SHA-256 and SHA-512 hashes (without storing the plaintext -password with reversible encryption). This builds upon previous work to improve -password sync for the AD DC (originally using GPG). - -The user command of 'samba-tool' has been updated in order to be able to -extract these additional hashes, as well as extracting the (HTTP) WDigest -hashes that we had also been storing in supplementalCredentials. - -Improvements to DNS during Active Directory domain join -------------------------------------------------------- - -The 'samba-tool' domain join command will now add the A and GUID DNS records -(on both the local and remote servers) during a join if possible via RPC. This -should allow replication to proceed more smoothly post-join. - -The mname element of the SOA record will now also be dynamically generated to -point to the local read-write server. 'samba_dnsupdate' should now be more -reliable as it will now find the appropriate name server even when resolv.conf -points to a forwarder. - -Significant AD performance and replication improvements -------------------------------------------------------- - -Previously, replication of group memberships was been an incredibly expensive -process for the AD DC. This was mostly due to unnecessary CPU time being spent -parsing member linked attributes. The database now stores these linked -attributes in sorted form to perform efficient searches for existing members. -In domains with a large number of group memberships, a join can now be -completed in half the time compared with Samba 4.6. - -LDAP search performance has also improved, particularly in the unindexed search -case. Parsing and processing of security descriptors should now be more -efficient, improving replication but also overall performance. - -Query record for open file or directory ---------------------------------------- - -The record attached to an open file or directory in Samba can be -queried through the 'net tdb locking' command. In clustered Samba this -can be useful to determine the file or directory triggering -corresponding "hot" record warnings in ctdb. - -Removal of lpcfg_register_defaults_hook() ------------------------------------------ - -The undocumented and unsupported function lpcfg_register_defaults_hook() -that was used by external projects to call into Samba and modify -smb.conf default parameter settings has been removed. If your project -was using this call please raise the issue on -samba-technical@lists.samba.org in order to design a supported -way of obtaining the same functionality. - -Change of loadable module interface ------------------------------------ - -The _init function of all loadable modules in Samba has changed -from: - -NTSTATUS _init(void); - -to: - -NTSTATUS _init(TALLOC_CTX *); - -This allows a program loading a module to pass in a long-lived -talloc context (which must be guaranteed to be alive for the -lifetime of the module). This allows modules to avoid use of -the talloc_autofree_context() (which is inherently thread-unsafe) -and still be valgrind-clean on exit. Modules that don't need to -free long-lived data on exit should use the NULL talloc context. - -Parameter changes ------------------ - -The "strict sync" global parameter has been changed from -a default of "no" to "yes". This means smbd will by default -obey client requests to synchronize unwritten data in operating -system buffers safely onto disk. This is a safer default setting -for modern SMB1/2/3 clients. - -The 'ntlm auth' option default is renamed to 'ntlmv2-only', reflecting -the previous behaviour. Two new values have been provided, -'mschapv2-and-ntlmv2-only' (allowing MSCHAPv2 while denying NTLMv1) -and 'disabled', totally disabling NTLM authentication and password -changes. smb.conf changes ================ Parameter Name Description Default -------------- ----------- ------- - allow unsafe cluster upgrade New parameter no - auth event notification New parameter no - auth methods Deprecated - client max protocol Effective SMB3_11 - default changed - map untrusted to domain New value/ auto - Default changed/ - Deprecated - mit kdc command New parameter - profile acls Deprecated - rpc server dynamic port range New parameter 49152-65535 - strict sync Default changed yes - password hash userPassword schemes New parameter - ntlm auth New values ntlmv2-only KNOWN ISSUES ============ -https://wiki.samba.org/index.php/Release_Planning_for_Samba_4.7#Release_blocking_bugs +https://wiki.samba.org/index.php/Release_Planning_for_Samba_4.8#Release_blocking_bugs ####################################### -- 2.34.1