Chapter 30. Upgrading from Samba-2.x to Samba-3.0.0
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## Chapter 30. Upgrading from Samba-2.x to Samba-3.0.0

### Jelmer R. Vernooij

The Samba Team

`<jelmer@samba.org>`

### John H. Terpstra

Samba Team

`<jht@samba.org>`

### Gerald (Jerry) Carter

Samba Team

`<jerry@samba.org>`

June 30, 2003

## New Features in Samba-3

Major new features:

1. Active Directory support. This release is able to join a ADS realm as a member server and authenticate users using LDAP/kerberos.

2. Unicode support. Samba will now negotiate UNICODE on the wire and internally there is now a much better infrastructure for multi-byte and UNICODE character sets.

3. New authentication system. The internal authentication system has been almost completely rewritten. Most of the changes are internal, but the new auth system is also very configurable.

4. New filename mangling system. The filename mangling system has been completely rewritten. An internal database now stores mangling maps persistently. This needs lots of testing.

5. New "net" command. A new "net" command has been added. It is somewhat similar to the "net" command in windows. Eventually we plan to replace a bunch of other utilities (such as smbpasswd) with subcommands in "net", at the moment only a few things are implemented.

6. Samba now negotiates NT-style status32 codes on the wire. This improves error handling a lot.

7. Better Windows 2000/XP/2003 printing support including publishing printer attributes in active directory

8. New loadable RPC modules

9. New dual-daemon winbindd support (-B) for better performance

10. Support for migrating from a Windows NT 4.0 domain to a Samba domain and maintaining user, group and domain SIDs

11. Support for establishing trust relationships with Windows NT 4.0 domain controllers

12. Initial support for a distributed Winbind architecture using an LDAP directory for storing SID to uid/gid mappings

13. Major updates to the Samba documentation tree.

Plus lots of other improvements!

## Configuration Parameter Changes

This section contains a brief listing of changes to smb.conf options in the 3.0.0 release. Please refer to the smb.conf(5) man page for complete descriptions of new or modified parameters.

### Removed Parameters

(order alphabetically):

- admin log

- alternate permissions

- character set

- client codepage

- code page directory

- coding system

- domain admin group

- domain guest group

- force unknown acl user

- nt smb support

- post script

- printer driver

- printer driver file

- printer driver location

- status

- total print jobs

- use rhosts

- valid chars

- vfs options

### New Parameters

(new parameters have been grouped by function):

Remote management

- abort shutdown script

- shutdown script

User and Group Account Management

- add group script

- add machine script

- add user to group script

- algorithmic rid base

- delete group script

- delete user from group script

- passdb backend

- set primary group script

Authentication

- auth methods

- ads server

- realm

Protocol Options

- client lanman auth

- client NTLMv2 auth

- client schannel

- client signing

- client use spnego

- disable netbios

- ntlm auth

- paranoid server security

- server schannel

- smb ports

- use spnego

File Service

- get quota command

- hide special files

- hide unwriteable files

- hostname lookups

- kernel change notify

- mangle prefix

- msdfs proxy

- set quota command

- use sendfile

- vfs objects

Printing

- max reported print jobs

UNICODE and Character Sets

- display charset

- dos charset

- unicode

- unix charset

SID to uid/gid Mappings

- idmap backend

- idmap gid

- idmap only

- idmap uid

LDAP

- ldap delete dn

- ldap group suffix

- ldap idmap suffix

- ldap machine suffix

- ldap passwd sync

- ldap trust ids

- ldap user suffix

General Configuration

- preload modules

- privatedir

### Modified Parameters (changes in behavior):

- encrypt passwords (enabled by default)

- mangling method (set to 'hash2' by default)

- passwd chat

- passwd program

- restrict anonymous (integer value)

- security (new 'ads' value)

- strict locking (enabled by default)

- winbind cache time (increased to 5 minutes)

- winbind uid (deprecated in favor of 'idmap uid')

- winbind gid (deprecated in favor of 'idmap gid')

## New Functionality

### Databases

This section contains brief descriptions of any new databases introduced in Samba 3.0. Please remember to backup your existing ${lock directory}/*tdb before upgrading to Samba 3.0. Samba will upgrade databases as they are opened (if necessary), but downgrading from 3.0 to 2.2 is an unsupported path.

Table 30.1. TDB File Descriptions

Name | Description | Backup?
--- | --- | ---
account_policy | User policy settings | yes
gencache | Generic caching db | no
group_mapping | Mapping table from Windows groups/SID to unix groups | yes
idmap | new ID map table from SIDS to UNIX uids/gids | yes
namecache | Name resolution cache entries | no
netlogon_unigrp | Cache of universal group membership obtained when operating as a member of a Windows domain | no
printing/*.tdb | Cached output from 'lpq command' created on a per print service basis | no
registry | Read-only samba registry skeleton that provides support for exporting various db tables via the winreg RPCs | no

### Changes in Behavior

The following issues are known changes in behavior between Samba 2.2 and Samba 3.0 that may affect certain installations of Samba.

1. When operating as a member of a Windows domain, Samba 2.2 would map any users authenticated by the remote DC to the 'guest account' if a uid could not be obtained via the getpwnam() call. Samba 3.0 rejects the connection as NT_STATUS_LOGON_FAILURE. There is no current work around to re-establish the 2.2 behavior.

2. When adding machines to a Samba 2.2 controlled domain, the 'add user script' was used to create the UNIX identity of the machine trust account. Samba 3.0 introduces a new 'add machine script' that must be specified for this purpose. Samba 3.0 will not fall back to using the 'add user script' in the absence of an 'add machine script'

### Charsets

You might experience problems with special characters when communicating with old DOS clients. Codepage support has changed in samba 3.0. Read the chapter Unicode support for details.

### Passdb Backends and Authentication

There have been a few new changes that Samba administrators should be aware of when moving to Samba 3.0.

1. Encrypted passwords have been enabled by default in order to inter-operate better with out-of-the-box Windows client installations. This does mean that either (a) a samba account must be created for each user, or (b) 'encrypt passwords = no' must be explicitly defined in smb.conf.

2. Inclusion of new `security` = ads option for integration with an Active Directory domain using the native Windows Kerberos 5 and LDAP protocols.

Samba 3.0 also includes the possibility of setting up chains of authentication methods (`auth methods`) and account storage backends (`passdb backend`). Please refer to the `smb.conf` man page and the chapter about account information databases for details. While both parameters assume sane default values, it is likely that you will need to understand what the values actually mean in order to ensure Samba operates correctly.

Certain functions of the smbpasswd(8) tool have been split between the new smbpasswd(8) utility, the net(8) tool, and the new pdbedit(8) utility. See the respective man pages for details.

### Charsets

You might experience problems with special characters when communicating with old DOS clients. Codepage support has changed in samba 3.0. Read the chapter Unicode support for details.

### LDAP

This section outlines the new features affecting Samba / LDAP integration.

#### New Schema

A new object class (sambaSamAccount) has been introduced to replace the old sambaAccount. This change aids us in the renaming of attributes to prevent clashes with attributes from other vendors. There is a conversion script (examples/LDAP/convertSambaAccount) to modify and LDIF file to the new schema.

Example:

    		$ ldapsearch .... -b "ou=people,dc=..." > old.ldif
    		$ convertSambaAccount <DOM SID> old.ldif new.ldif

The <DOM SID> can be obtained by running 'net getlocalsid <DOMAINNAME> on the Samba PDC as root.

The old sambaAccount schema may still be used by specifying the "ldapsam_compat" passdb backend. However, the sambaAccount and associated attributes have been moved to the historical section of the schema file and must be uncommented before use if needed. The 2.2 object class declaration for a sambaAccount has not changed in the 3.0 samba.schema file.

Other new object classes and their uses include:

- sambaDomain - domain information used to allocate rids for users and groups as necessary. The attributes are added in 'ldap suffix' directory entry automatically if an idmap uid/gid range has been set and the 'ldapsam' passdb backend has been selected.

- sambaGroupMapping - an object representing the relationship between a posixGroup and a Windows group/SID. These entries are stored in the 'ldap group suffix' and managed by the 'net groupmap' command.

- sambaUnixIdPool - created in the 'ldap idmap suffix' entry automatically and contains the next available 'idmap uid' and 'idmap gid'

- sambaIdmapEntry - object storing a mapping between a SID and a UNIX uid/gid. These objects are created by the idmap_ldap module as needed.

#### New Suffix for Searching

The following new smb.conf parameters have been added to aid in directing certain LDAP queries when 'passdb backend = ldapsam://...' has been specified.

- ldap suffix - used to search for user and computer accounts

- ldap user suffix - used to store user accounts

- ldap machine suffix - used to store machine trust accounts

- ldap group suffix - location of posixGroup/sambaGroupMapping entries

- ldap idmap suffix - location of sambaIdmapEntry objects

If an 'ldap suffix' is defined, it will be appended to all of the remaining sub-suffix parameters. In this case, the order of the suffix listings in smb.conf is important. Always place the 'ldap suffix' first in the list.

Due to a limitation in Samba's smb.conf parsing, you should not surround the DN's with quotation marks.

#### IdMap LDAP support

Samba 3.0 supports an ldap backend for the idmap subsystem. The following options would inform Samba that the idmap table should be stored on the directory server onterose in the "ou=idmap,dc=plainjoe, dc=org" partition.

`[global]`
...
`idmap backend = ldap:ldap://onterose/`
`ldap idmap suffix = ou=idmap,dc=plainjoe,dc=org`
`idmap uid = 40000-50000`
`idmap gid = 40000-50000`

This configuration allows winbind installations on multiple servers to share a uid/gid number space, thus avoiding the interoperability problems with NFS that were present in Samba 2.2.

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