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1 <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter 8. Updating Samba-3</title><link rel="stylesheet" href="samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.70.1"><link rel="start" href="index.html" title="Samba-3 by Example"><link rel="up" href="DMSMig.html" title="Part II. Domain Members, Updating Samba and Migration"><link rel="prev" href="unixclients.html" title="Chapter 7. Adding Domain Member Servers and Clients"><link rel="next" href="ntmigration.html" title="Chapter 9. Migrating NT4 Domain to Samba-3"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 8. Updating Samba-3</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="unixclients.html">Prev</a> </td><th width="60%" align="center">Part II. Domain Members, Updating Samba and Migration</th><td width="20%" align="right"> <a accesskey="n" href="ntmigration.html">Next</a></td></tr></table><hr></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="upgrades"></a>Chapter 8. Updating Samba-3</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="upgrades.html#id2602404">Introduction</a></span></dt><dd><dl><dt><span class="sect2"><a href="upgrades.html#id2602500">Cautions and Notes</a></span></dt></dl></dd><dt><span class="sect1"><a href="upgrades.html#id2603822">Upgrading from Samba 1.x and 2.x to Samba-3</a></span></dt><dd><dl><dt><span class="sect2"><a href="upgrades.html#sbeug2">Samba 1.9.x and 2.x Versions Without LDAP</a></span></dt><dt><span class="sect2"><a href="upgrades.html#id2604191">Applicable to All Samba 2.x to Samba-3 Upgrades</a></span></dt><dt><span class="sect2"><a href="upgrades.html#id2604525">Samba-2.x with LDAP Support</a></span></dt></dl></dd><dt><span class="sect1"><a href="upgrades.html#id2604706">Updating a Samba-3 Installation</a></span></dt><dd><dl><dt><span class="sect2"><a href="upgrades.html#id2604817">Samba-3 to Samba-3 Updates on the Same Server</a></span></dt><dt><span class="sect2"><a href="upgrades.html#id2605020">Migrating Samba-3 to a New Server</a></span></dt><dt><span class="sect2"><a href="upgrades.html#id2605434">Migration of Samba Accounts to Active Directory</a></span></dt></dl></dd></dl></div><p>
4 It was a little difficult to select an appropriate title for this chapter.
5 From email messages on the Samba mailing lists it is clear that many people
6 consider the updating and upgrading of Samba to be a migration matter. Others
7 talk about migrating Samba servers when in fact the issue at hand is one of
8 installing a new Samba server to replace an older existing Samba server.
9 </p><p>
12 There has also been much talk about migration of Samba-3 from an smbpasswd
13 passdb backend to the use of the tdbsam or ldapsam facilities that are new
14 to Samba-3.
15 </p><p>
16 Clearly, there is not a great deal of clarity in the terminology that various
17 people apply to these modes by which Samba servers are updated. This is further
18 highlighted by an email posting that included the following neat remark:
21 I like the “<span class="quote">net rpc vampire</span>” on NT4, but that to my surprise does
22 not seem to work against a Samba PDC and, if addressed in the Samba to Samba
23 context in either book, I could not find it.
24 </p></blockquote></div><p>
26 So in response to the significant request for these situations to be better
27 documented, this chapter has now been added. User contributions and documentation
28 of real-world experiences are a most welcome addition to this chapter.
29 </p><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2602404"></a>Introduction</h2></div></div></div><p>
33 A Windows network administrator explained in an email what changes he was
36 Others have experienced much pain and user frustration. So it is to be hoped
37 that the notes in this chapter will make a positive difference by assuring
38 that someone will be saved a lot of discomfort.
39 </p><p>
40 Before anyone commences an upgrade or an update of Samba, the one cardinal
41 rule that must be observed is: Backup all Samba configuration files in
42 case it is necessary to revert to the old version. Even if you do not like
43 this precautionary step, users will punish an administrator who
44 fails to take adequate steps to avoid situations that may inflict lost
45 productivity on them.
46 </p><div class="warning" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Warning</h3><p>
49 Samba makes it possible to upgrade and update configuration files, but it
50 is not possible to downgrade the configuration files. Please ensure that
51 all configuration and control files are backed up to permit a down-grade
52 in the rare event that this may be necessary.
53 </p></div><p>
56 It is prudent also to backup all data files on the server before attempting
57 to perform a major upgrade. Many administrators have experienced the consequences
58 of failure to take adequate precautions. So what is adequate? That is simple!
59 If data is lost during an upgrade or update and it can not be restored,
60 the precautions taken were inadequate. If a backup was not needed, but was available,
61 caution was on the side of the victor.
62 </p><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2602500"></a>Cautions and Notes</h3></div></div></div><p>
63 Someone once said, “<span class="quote">It is good to be sorry, but better never to need to be!</span>”
64 These are wise words of advice to those contemplating a Samba upgrade or update.
65 </p><p>
71 the installation of a version of Samba that is a whole generation or more ahead of
72 that which is installed. Generations are indicated by the first digit of the version
74 is in development.
75 </p><p>
80 </p><p>
82 While the use of these terms is an exercise in semantics, what needs to be realized
83 is that there are major functional differences between a Samba 2.x release and a Samba
84 3.0.x release. Such differences may require a significantly different approach to
85 solving the same networking challenge and generally require careful review of the
86 latest documentation to identify precisely how the new installation may need to be
87 modified to preserve prior functionality.
88 </p><p>
89 There is an old axiom that says, “<span class="quote">The greater the volume of the documentation,
90 the greater the risk that noone will read it, but where there is no documentation,
92 It is hoped that this update to the documentation will avoid both extremes.
93 </p><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2602604"></a>Security Identifiers (SIDs)</h4></div></div></div><p>
100 Before the days of Windows NT and OS/2, every Windows and DOS networking client
101 that used the SMB protocols was an entirely autonomous entity. There was no concept
102 of a security identifier for a machine or a user outside of the username, the
103 machine name, and the workgroup name. In actual fact, these were not security identifiers
104 in the same context as the way that the SID is used since the development of
105 Windows NT 3.10.
106 </p><p>
113 Versions of Samba prior to 1.9 did not make use of a SID. Instead they make exclusive use
114 of the username that is embedded in the SessionSetUpAndX component of the connection
115 setup process between a Windows client and an SMB/CIFS server.
116 </p><p>
121 RPC-based protocols that implemented support for Samba to store a machine SID. This
123 </p><p>
127 Within the lifetime of the early Samba 2.x series, the machine SID information was
129 it is still located in Samba 3.0.x along with other information that pertains to the
130 local machine and its role within a domain security context.
131 </p><p>
136 There are two types of SID, those pertaining to the machine itself and the domain to
137 which it may belong, and those pertaining to users and groups within the security
138 context of the local machine, in the case of standalone servers (SAS) and domain member
139 servers (DMS).
140 </p><p>
147 When the Samba <span><strong class="command">smbd</strong></span> daemon is first started, if the <code class="filename">secrets.tdb</code>
148 file does not exist, it is created at the first client connection attempt. If this file does
149 exist, <span><strong class="command">smbd</strong></span> checks that there is a machine SID (if it is a domain controller,
150 it searches for the domain SID). If <span><strong class="command">smbd</strong></span> does not find one for the current
151 name of the machine or for the current name of the workgroup, a new SID will be generated and
152 then written to the <code class="filename">secrets.tdb</code> file. The SID is generated in a nondeterminative
153 manner. This means that each time it is generated for a particular combination of machine name
154 (hostname) and domain name (workgroup), it will be different.
155 </p><p>
157 The SID is the key used by MS Windows networking for all networking operations. This means
158 that when the machine or domain SID changes, all security-encoded objects such as profiles
159 and ACLs may become unusable.
160 </p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>
161 It is of paramount importance that the machine and domain SID be backed up so that in
162 the event of a change of hostname (machine name) or domain name (workgroup) the SID can
163 be restored to its previous value.
164 </p></div><p>
175 In Samba-3 on a domain controller (PDC or BDC), the domain name controls the domain
176 SID. On all prior versions the hostname (computer name, or NetBIOS name) controlled
177 the SID. On a standalone server the hostname still controls the SID.
178 </p><p>
181 The local machine SID can be backed up using this procedure (Samba-3):
184 </pre><p>
188 </pre><p>
189 This SID can be restored by executing:
192 </pre><p>
193 </p><p>
194 Samba 1.9.x stored the machine SID in the the file <code class="filename">/etc/MACHINE.SID</code>
195 from which it could be recovered and stored into the <code class="filename">secrets.tdb</code> file
196 using the procedure shown above.
197 </p><p>
198 Where the <code class="filename">secrets.tdb</code> file exists and a version of Samba 2.x or later
199 has been used, there is no specific need to go through this update process. Samba-3 has the
200 ability to read the older tdb file and to perform an in-situ update to the latest tdb format.
201 This is not a reversible process it is a one-way upgrade.
202 </p><p>
204 In the course of the Samba 2.0.x series the <span><strong class="command">smbpasswd</strong></span> was modified to
205 permit the domain SID to be captured to the <code class="filename">secrets.tdb</code> file by executing:
208 </pre><p>
209 </p><p>
210 The release of the Samba 2.2.x series permitted the SID to be obtained by executing:
213 </pre><p>
214 from which the SID could be copied to a file and then written to the Samba-2.2.x
218 </pre><p>
219 </p><p>
222 Domain security information, which includes the domain SID, can be obtained from Samba-2.2.x
223 systems by executing:
226 </pre><p>
227 This can also be done with Samba-3 by executing:
230 Domain Name: MIDEARTH
232 Sequence number: 1113415916
233 Num users: 4237
234 Num domain groups: 86
235 Num local groups: 0
236 </pre><p>
237 It is a very good practice to store this SID information in a safely kept file, just in
238 case it is ever needed at a later date.
239 </p><p>
243 Take note that the domain SID is used extensively in Samba. Where LDAP is used for the
244 <em class="parameter"><code>passdb backend</code></em>, all user, group, and trust accounts are encoded
245 with the domain SID. This means that if the domain SID changes for any reason, the entire
246 Samba environment can become broken and require extensive corrective action if the
247 original SID cannot be restored. Fortunately, it can be recovered from a dump of the
248 LDAP database. A dump of the LDAP directory database can be obtained by executing:
251 </pre><p>
252 </p><p>
256 When the domain SID has changed, roaming profiles cease to be functional. The recovery
257 of roaming profiles necessitates resetting of the domain portion of the user SID
258 that owns the profile. This is encoded in the <code class="filename">NTUser.DAT</code> and can be
259 updated using the Samba <span><strong class="command">profiles</strong></span> utility. Please be aware that not all
260 Linux distributions of the Samba RPMs include this essential utility. Please do not
261 complain to the Samba Team if this utility is missing; that issue that must be
262 addressed to the creator of the RPM package. The Samba Team do their best to make
263 available all the tools needed to manage a Samba-based Windows networking environment.
264 </p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2603325"></a>Change of hostname</h4></div></div></div><p>
267 Samba uses two methods by which the primary NetBIOS machine name (also known as a computer
268 name or the hostname) may be determined: If the <code class="filename">smb.conf</code> file contains a
269 <em class="parameter"><code>netbios name</code></em> entry, its value will be used directly. In the absence
270 of such an entry, the UNIX system hostname will be used.
271 </p><p>
272 Many sites have become victims of lost Samba functionality because the UNIX system
273 hostname was changed for one reason or another. Such a change will cause a new machine
274 SID to be generated. If this happens on a domain controller, it will also change the
275 domain SID. These SIDs can be updated (restored) using the procedure outlined previously.
276 </p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>
278 is changed, be sure to reset the machine SID to the original setting. Otherwise
279 there may be serious interoperability and/or operational problems.
280 </p></div></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2603391"></a>Change of Workgroup (Domain) Name</h4></div></div></div><p>
282 The domain name of a Samba server is identical to the workgroup name and is
283 set in the <code class="filename">smb.conf</code> file using the <em class="parameter"><code>workgroup</code></em> parameter.
284 This has been consistent throughout the history of Samba and across all versions.
285 </p><p>
287 Be aware that when the workgroup name is changed, a new SID will be generated.
288 The old domain SID can be reset using the procedure outlined earlier in this chapter.
289 </p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="sbeug1"></a>Location of config files</h4></div></div></div><p>
290 The Samba-Team has maintained a constant default location for all Samba control files
291 throughout the life of the project. People who have produced binary packages of Samba
292 have varied the location of the Samba control files. This has led to some confusion
293 for network administrators.
294 </p><p>
296 The Samba 1.9.x <code class="filename">smb.conf</code> file may be found either in the <code class="filename">/etc</code>
298 </p><p>
299 During the life of the Samba 2.x release, the <code class="filename">smb.conf</code> file was relocated
301 remains located also for Samba 3.0.x installations.
302 </p><p>
304 Samba 2.x introduced the <code class="filename">secrets.tdb</code> file that is also stored in the
305 <code class="filename">/etc/samba</code> directory, or in the <code class="filename">/usr/local/samba/lib</code>
306 directory subsystem.
307 </p><p>
309 The location at which <span><strong class="command">smbd</strong></span> expects to find all configuration and control
310 files is determined at the time of compilation of Samba. For versions of Samba prior to
311 3.0, one way to find the expected location of these files is to execute:
316 </pre><p>
317 Note: The <span><strong class="command">smbd</strong></span> executable may be located in the path
319 </p><p>
321 Samba-3 provides a neat new way to track the location of all control files as well as to
322 find the compile-time options used as the Samba package was built. Here is how the dark
323 secrets of the internals of the location of control files within Samba executables can
324 be uncovered:
327 Build environment:
328 Built by: root@frodo
330 Built using: gcc
331 Build host: Linux frodo 2.6...
332 SRCDIR: /usr/src/packages/BUILD/samba-3.0.20/source
333 BUILDDIR: /usr/src/packages/BUILD/samba-3.0.20/source
335 Paths:
336 SBINDIR: /usr/sbin
337 BINDIR: /usr/bin
338 SWATDIR: /usr/share/samba/swat
339 CONFIGFILE: /etc/samba/smb.conf
340 LOGFILEBASE: /var/log/samba
341 LMHOSTSFILE: /etc/samba/lmhosts
342 LIBDIR: /usr/lib/samba
343 SHLIBEXT: so
344 LOCKDIR: /var/lib/samba
345 PIDDIR: /var/run/samba
346 SMB_PASSWD_FILE: /etc/samba/smbpasswd
347 PRIVATE_DIR: /etc/samba
348 ...
349 </pre><p>
350 </p><p>
352 It is important that both the <code class="filename">smb.conf</code> file and the <code class="filename">secrets.tdb</code>
354 is version-encoded, and therefore a newer version may not work with an older version
355 of Samba. A backup means that it is always possible to revert a failed or problematic
356 upgrade.
357 </p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2603657"></a>International Language Support</h4></div></div></div><p>
362 Samba-2.x had no support for Unicode; instead, all national language character-set support in file names
363 was done using particular locale codepage mapping techniques. Samba-3 supports Unicode in file names, thus
364 providing true internationalization support.
365 </p><p>
367 Non-English users whose national language character set has special characters and who upgrade naively will
368 find that many files that have the special characters in the file name will see them garbled and jumbled up.
369 This typically happens with umlauts and accents because these characters were particular to the codepage
371 </p><p>
373 Files that are created with Samba-3 will use UTF-8 encoding. Should the file system ever end up with a
374 mix of codepage (unix charset)-encoded file names and UTF-8-encoded file names, the mess will take some
375 effort to set straight.
376 </p><p>
378 A very helpful tool is available from Bjorn Jacke's <a href="http://j3e.de/linux/convmv/" target="_top">convmv</a>
379 work. Convmv is a tool that can be used to convert file and directory names from one encoding method to
380 another. The most common use for this tool is to convert locale-encoded files to UTF-8 Unicode encoding.
381 </p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2603751"></a>Updates and Changes in Idealx smbldap-tools</h4></div></div></div><p>
382 The smbldap-tools have been maturing rapidly over the past year. With maturation comes change.
383 The location of the <code class="filename">smbldap.conf</code> and the <code class="filename">smbldap_bind.conf</code>
384 configuration files have been moved from the directory <code class="filename">/etc/smbldap-tools</code> to
386 </p><p>
387 The smbldap-tools maintains an entry in the LDAP directory in which it stores the next
388 values that should be used for UID and GID allocation for POSIX accounts that are created
389 using this tool. The DIT location of these values has changed recently. The original
390 <code class="constant">sambaUnixIdPooldn object</code> entity was stored in a directory entry (DIT object)
393 current release should note that the information stored under <code class="constant">NextFreeUnixId</code>
395 </p></div></div></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2603822"></a>Upgrading from Samba 1.x and 2.x to Samba-3</h2></div></div></div><p>
397 may experience little difficulty or may require a lot of effort, depending
399 generally be simple and straightforward, although no upgrade should be
400 attempted without proper planning and preparation.
401 </p><p>
402 There are two basic modes of use of Samba versions prior to Samba-3. The first
403 does not use LDAP, the other does. Samba-1.9.x did not provide LDAP support.
404 Samba-2.x could be compiled with LDAP support.
405 </p><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="sbeug2"></a>Samba 1.9.x and 2.x Versions Without LDAP</h3></div></div></div><p>
406 Where it is necessary to upgrade an old Samba installation to Samba-3,
407 the following procedure can be followed:
408 </p><div class="procedure"><a name="id2603860"></a><p class="title"><b>Procedure 8.1. Upgrading from a Pre-Samba-3 Version</b></p><ol type="1"><li><p>
412 Stop Samba. This can be done using the appropriate system tool
413 that is particular for each operating system or by executing the
414 <span><strong class="command">kill</strong></span> command on <span><strong class="command">smbd</strong></span>,
415 <span><strong class="command">nmbd</strong></span>, and <span><strong class="command">winbindd</strong></span>.
416 </p></li><li><p>
418 safe location.
419 </p></li><li><p>
421 back it up to a safe location.
422 </p></li><li><p>
424 back it up to a safe location.
425 </p></li><li><p>
430 Find the location of the lock directory. This is the directory
431 in which Samba stores all its tdb control files. The default
432 location used by the Samba Team is in
434 but on Linux systems the old location was under the
436 Linux Standards Base specified location is now under the
438 tdb files to a safe location.
439 </p></li><li><p>
441 It is now safe to upgrade the Samba installation. On Linux systems
442 it is not necessary to remove the Samba RPMs because a simple
443 upgrade installation will automatically remove the old files.
444 </p><p>
445 On systems that do not support a reliable package management system
446 it is advisable either to delete the Samba old installation or to
447 move it out of the way by renaming the directories that contain the
448 Samba binary files.
449 </p></li><li><p>
450 When the Samba upgrade has been installed, the first step that should
451 be completed is to identify the new target locations for the control
452 files. Follow the steps shown in <a href="upgrades.html#sbeug1" title="Location of config files">???</a> to locate
453 the correct directories to which each control file must be moved.
454 </p></li><li><p>
455 Do not change the hostname.
456 </p></li><li><p>
457 Do not change the workgroup name.
458 </p></li><li><p>
460 Execute the <span><strong class="command">testparm</strong></span> to validate the <code class="filename">smb.conf</code> file.
461 This process will flag any parameters that are no longer supported.
462 It will also flag configuration settings that may be in conflict.
463 </p><p>
464 One solution that may be used to clean up and to update the <code class="filename">smb.conf</code>
466 then executing the following:
470 </pre><p>
473 and of all nonconforming configuration settings.
474 </p></li><li><p>
476 It is now safe to start Samba using the appropriate system tool.
478 <span><strong class="command">smbd</strong></span>, and <span><strong class="command">winbindd</strong></span> for the command
479 line while logged in as the root user.
480 </p></li></ol></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2604191"></a>Applicable to All Samba 2.x to Samba-3 Upgrades</h3></div></div></div><p>
484 Samba 2.x servers that were running as a domain controller (PDC)
485 require changes to the configuration of the scripting interface
486 tools that Samba uses to perform OS updates for
487 users, groups, and trust accounts (machines and interdomain).
488 </p><p>
490 The following parameters are new to Samba-3 and should be correctly configured.
491 Please refer to <a href="secure.html" title="Chapter 3. Secure Office Networking">???</a> through <a href="2000users.html" title="Chapter 6. A Distributed 2000-User Network">???</a>
492 in this book for examples of use of the new parameters shown here:
500 </p><p>
501 </p><table class="simplelist" border="0" summary="Simple list"><tr><td><p>add group script</p></td></tr><tr><td><p>add machine script</p></td></tr><tr><td><p>add user to group script</p></td></tr><tr><td><p>delete group script</p></td></tr><tr><td><p>delete user from group script</p></td></tr><tr><td><p>passdb backend</p></td></tr><tr><td><p>set primary group script</p></td></tr></table><p>
502 </p><p>
507 used exclusively to add user accounts.
508 </p><p>
518 Where the <em class="parameter"><code>passdb backend</code></em> used is either <code class="constant">smbpasswd</code>
520 are typically used. These involve use of OS tools such as <span><strong class="command">useradd</strong></span>,
521 <span><strong class="command">usermod</strong></span>, <span><strong class="command">userdel</strong></span>, <span><strong class="command">groupadd</strong></span>,
522 <span><strong class="command">groupmod</strong></span>, <span><strong class="command">groupdel</strong></span>, and so on.
523 </p><p>
527 Where the <em class="parameter"><code>passdb backend</code></em> makes use of an LDAP directory,
529 by Idealx or to use an alternate toolset provided by a third
530 party or else home-crafted to manage the LDAP directory accounts.
531 </p></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2604525"></a>Samba-2.x with LDAP Support</h3></div></div></div><p>
532 Samba version 2.x could be compiled for use either with or without LDAP.
533 The LDAP control settings in the <code class="filename">smb.conf</code> file in this old version are
534 completely different (and less complete) than they are with Samba-3. This
535 means that after migrating the control files, it is necessary to reconfigure
536 the LDAP settings entirely.
537 </p><p>
538 Follow the procedure outlined in <a href="upgrades.html#sbeug2" title="Samba 1.9.x and 2.x Versions Without LDAP">???</a> to affect a migration
539 of all files to the correct locations.
540 </p><p>
543 The Samba SAM schema required for Samba-3 is significantly different from that
544 used with Samba 2.x. This means that the LDAP directory must be updated
545 using the procedure outlined in the Samba WHATSNEW.txt file that accompanies
546 all releases of Samba-3. This information is repeated here directly from this
547 file:
549 This is an extract from the Samba-3.0.x WHATSNEW.txt file:
550 ==========================================================
551 Changes in Behavior
552 -------------------
554 The following issues are known changes in behavior between Samba 2.2 and
555 Samba 3.0 that may affect certain installations of Samba.
558 map any users authenticated by the remote DC to the 'guest account'
559 if a uid could not be obtained via the getpwnam() call. Samba 3.0
560 rejects the connection as NT_STATUS_LOGON_FAILURE. There is no
561 current work around to re-establish the 2.2 behavior.
564 'add user script' was used to create the UNIX identity of the
565 machine trust account. Samba 3.0 introduces a new 'add machine
566 script' that must be specified for this purpose. Samba 3.0 will
567 not fall back to using the 'add user script' in the absence of
568 an 'add machine script'
570 ######################################################################
571 Passdb Backends and Authentication
572 ##################################
574 There have been a few new changes that Samba administrators should be
575 aware of when moving to Samba 3.0.
577 1) encrypted passwords have been enabled by default in order to
578 inter-operate better with out-of-the-box Windows client
579 installations. This does mean that either (a) a samba account
580 must be created for each user, or (b) 'encrypt passwords = no'
581 must be explicitly defined in smb.conf.
583 2) Inclusion of new 'security = ads' option for integration
584 with an Active Directory domain using the native Windows
585 Kerberos 5 and LDAP protocols.
587 MIT kerberos 1.3.1 supports the ARCFOUR-HMAC-MD5 encryption
588 type which is necessary for servers on which the
589 administrator password has not been changed, or kerberos-enabled
590 SMB connections to servers that require Kerberos SMB signing.
591 Besides this one difference, either MIT or Heimdal Kerberos
592 distributions are usable by Samba 3.0.
595 Samba 3.0 also includes the possibility of setting up chains
596 of authentication methods (auth methods) and account storage
597 backends (passdb backend). Please refer to the smb.conf(5)
598 man page for details. While both parameters assume sane default
599 values, it is likely that you will need to understand what the
600 values actually mean in order to ensure Samba operates correctly.
602 The recommended passdb backends at this time are
604 * smbpasswd - 2.2 compatible flat file format
605 * tdbsam - attribute rich database intended as an smbpasswd
606 replacement for stand alone servers
607 * ldapsam - attribute rich account storage and retrieval
608 backend utilizing an LDAP directory.
609 * ldapsam_compat - a 2.2 backward compatible LDAP account
610 backend
612 Certain functions of the smbpasswd(8) tool have been split between the
614 utility. See the respective man pages for details.
616 ######################################################################
617 LDAP
618 ####
620 This section outlines the new features affecting Samba / LDAP
621 integration.
623 New Schema
624 ----------
626 A new object class (sambaSamAccount) has been introduced to replace
627 the old sambaAccount. This change aids us in the renaming of
628 attributes to prevent clashes with attributes from other vendors.
629 There is a conversion script (examples/LDAP/convertSambaAccount) to
630 modify and LDIF file to the new schema.
632 Example:
636 --input=sambaAcct.ldif --output=sambaSamAcct.ldif \
637 --changetype=[modify|add]
641 the format of the generated LDIF output--either create new entries
642 or modify existing entries.
644 The old sambaAccount schema may still be used by specifying the
645 "ldapsam_compat" passdb backend. However, the sambaAccount and
646 associated attributes have been moved to the historical section of
647 the schema file and must be uncommented before use if needed.
648 The 2.2 object class declaration for a sambaAccount has not changed
649 in the 3.0 samba.schema file.
651 Other new object classes and their uses include:
653 * sambaDomain - domain information used to allocate rids
654 for users and groups as necessary. The attributes are added
655 in 'ldap suffix' directory entry automatically if
656 an idmap uid/gid range has been set and the 'ldapsam'
657 passdb backend has been selected.
659 * sambaGroupMapping - an object representing the
660 relationship between a posixGroup and a Windows
661 group/SID. These entries are stored in the 'ldap
662 group suffix' and managed by the 'net groupmap' command.
664 * sambaUnixIdPool - created in the 'ldap idmap suffix' entry
665 automatically and contains the next available 'idmap uid' and
666 'idmap gid'
668 * sambaIdmapEntry - object storing a mapping between a
669 SID and a UNIX uid/gid. These objects are created by the
670 idmap_ldap module as needed.
672 * sambaSidEntry - object representing a SID alone, as a Structural
673 class on which to build the sambaIdmapEntry.
676 New Suffix for Searching
677 ------------------------
679 The following new smb.conf parameters have been added to aid in directing
680 certain LDAP queries when 'passdb backend = ldapsam://...' has been
681 specified.
683 * ldap suffix - used to search for user and computer accounts
684 * ldap user suffix - used to store user accounts
685 * ldap machine suffix - used to store machine trust accounts
686 * ldap group suffix - location of posixGroup/sambaGroupMapping entries
687 * ldap idmap suffix - location of sambaIdmapEntry objects
689 If an 'ldap suffix' is defined, it will be appended to all of the
690 remaining sub-suffix parameters. In this case, the order of the suffix
691 listings in smb.conf is important. Always place the 'ldap suffix' first
692 in the list.
694 Due to a limitation in Samba's smb.conf parsing, you should not surround
695 the DN's with quotation marks.
696 </pre><p>
697 </p></div></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2604706"></a>Updating a Samba-3 Installation</h2></div></div></div><p>
698 The key concern in this section is to deal with the changes that have been
700 Network administrators have expressed concerns over the steps that should be
701 taken to update Samba-3 versions.
702 </p><p>
704 The information in <a href="upgrades.html#sbeug1" title="Location of config files">???</a> would not be necessary if every
705 person who has ever produced Samba executable (binary) files could agree on
706 the preferred location of the <code class="filename">smb.conf</code> file and other Samba control files.
707 Clearly, such agreement is further away than a pipedream.
708 </p><p>
710 Vendors and packagers who produce Samba binary installable packages do not,
711 as a rule, use the default paths used by the Samba-Team for the location of
712 the binary files, the <code class="filename">smb.conf</code> file, and the Samba control files (tdb's
714 the network or UNIX administrator who sets out to build the Samba executable
715 files from the Samba tarball must take particular care. Failure to take care
716 will result in both the original vendor's version of Samba remaining installed
717 and the new version being installed in the default location used
718 by the Samba-Team. This can lead to confusion and to much lost time as the
719 uninformed administrator deals with apparent failure of the update to take
720 effect.
721 </p><p>
723 The best advice for those lacking in code compilation experience is to use
724 only vendor (or Samba-Team) provided binary packages. The Samba packages
725 that are provided by the Samba-Team are generally built to use file paths
726 that are compatible with the original OS vendor's practices.
727 </p><p>
730 If you are not sure whether a binary package complies with the OS
731 vendor's practices, it is better to ask the package maintainer via
732 email than to waste much time dealing with the nuances.
733 Alternately, just diagnose the paths specified by the binary files following
734 the procedure outlined above.
735 </p><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2604817"></a>Samba-3 to Samba-3 Updates on the Same Server</h3></div></div></div><p>
736 The guidance in this section deals with updates to an existing
737 Samba-3 server installation.
738 </p><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2604828"></a>Updating from Samba Versions Earlier than 3.0.5</h4></div></div></div><p>
739 With the provision that the binary Samba-3 package has been built
740 with the same path and feature settings as the existing Samba-3
744 used, the LDAP schema.
745 </p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2604850"></a>Updating from Samba Versions between 3.0.6 and 3.0.10</h4></div></div></div><p>
749 it is necessary only to update the LDAP schema (where LDAP is used).
750 Always use the LDAP schema file that is shipped with the latest Samba-3
751 update.
752 </p><p>
756 Samba-3.0.6 introduced the ability to remember the last <span class="emphasis"><em>n</em></span> number
757 of passwords a user has used. This information will work only with
760 </p><p>
761 After updating the LDAP schema, do not forget to re-index the LDAP database.
762 </p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2604928"></a>Updating from Samba Versions after 3.0.6 to a Current Release</h4></div></div></div><p>
765 behaves. It also included a change in behavior of <span><strong class="command">winbindd</strong></span>.
766 Please refer to the man page for <code class="filename">smb.conf</code> before implementing any update
767 from versions prior to 3.0.8 to a current version.
768 </p><p>
770 In Samba-3.0.11 a new privileges interface was implemented. Please
771 refer to <a href="happy.html#sbehap-ppc" title="Addition of Machines to the Domain">???</a> for information regarding this new
772 feature. It is not necessary to implement the privileges interface, but it
773 is one that has been requested for several years and thus may be of interest
774 at your site.
775 </p><p>
777 suffix</code></em> and to the <em class="parameter"><code>ldap machine suffix</code></em> behaviors.
778 The following information has been extracted from the WHATSNEW.txt file from this
779 release:
781 ============
782 LDAP Changes
783 ============
786 smb.conf, all user-accounts must reside below the user suffix,
787 and all machine and inter-domain trust-accounts must be located
788 below the machine suffix. Previous Samba releases would fall
789 back to searching the 'ldap suffix' in some cases.
790 </pre><p>
791 </p></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2605020"></a>Migrating Samba-3 to a New Server</h3></div></div></div><p>
792 The two most likely candidates for replacement of a server are
793 domain member servers and domain controllers. Each needs to be
794 handled slightly differently.
795 </p><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2605032"></a>Replacing a Domain Member Server</h4></div></div></div><p>
797 Replacement of a domain member server should be done
798 using the same procedure as outlined in <a href="unixclients.html" title="Chapter 7. Adding Domain Member Servers and Clients">???</a>.
799 </p><p>
800 Usually the new server will be introduced with a temporary name. After
801 the old server data has been migrated to the new server, it is customary
802 that the new server be renamed to that of the old server. This will
803 change its SID and will necessitate rejoining to the domain.
804 </p><p>
811 Following a change of hostname (NetBIOS name) it is a good idea on all servers
812 to shut down the Samba <span><strong class="command">smbd</strong></span>, <span><strong class="command">nmbd</strong></span>, and
813 <span><strong class="command">winbindd</strong></span> services, delete the <code class="filename">wins.dat</code>
815 that the old name and IP address information is no longer able to interfere with
816 name to IP address resolution. If this is not done, there can be temporary name
817 resolution problems. These problems usually clear within 45 minutes of a name
818 change, but can persist for a longer period of time.
819 </p><p>
824 If the old domain member server had local accounts, it is necessary to create
825 on the new domain member server the same accounts with the same UID and GID
829 for UNIX accounts that match the Samba accounts will reside in the system
832 account entries to the new target server.
833 </p><p>
835 Where the user accounts for both UNIX and Samba are stored in LDAP, the new
836 target server must be configured to use the <span><strong class="command">nss_ldap</strong></span> tool set.
837 This will automatically ensure that the appropriate user entities are
838 available on the new server.
839 </p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2605234"></a>Replacing a Domain Controller</h4></div></div></div><p>
841 In the past, people who replaced a Windows NT4 domain controller typically
842 installed a new server, created printers and file shares on it, then migrate across
843 all data that was destined to reside on it. The same can of course be done with
844 Samba.
845 </p><p>
846 From recent mailing list postings it would seem that some administrators
847 have the intent to just replace the old Samba server with a new one with
848 the same name as the old one. In this case, simply follow the same process
849 as for upgrading a Samba 2.x system and do the following:
851 Where UNIX (POSIX) user and group accounts are stored in the system
854 with identical UID and GID values for each user.
855 </p><p>
856 Where LDAP is used, if the new system is intended to be the LDAP server,
857 migrate it across by configuring the LDAP server
859 be populated either initially by setting this LDAP server up as a slave or
860 by dumping the data from the old LDAP server using the <span><strong class="command">slapcat</strong></span>
861 command and then reloading the same data into the new LDAP server using the
862 <span><strong class="command">slapadd</strong></span> command. Do not forget to install and configure
863 the <span><strong class="command">nss_ldap</strong></span> tool and the <code class="filename">/etc/nsswitch.conf</code>
865 </p></li><li><p>
866 Copy the <code class="filename">smb.conf</code> file from the old server to the new server into the correct
867 location as indicated previously in this chapter.
868 </p></li><li><p>
869 Copy the <code class="filename">secrets.tdb</code> file, the <code class="filename">smbpasswd</code>
872 from the old system to the correct location on the new system.
873 </p></li><li><p>
874 Before starting the Samba daemons, verify that the hostname of the new server
875 is identical to that of the old one. Note: The IP address can be different
876 from that of the old server.
877 </p></li><li><p>
878 Copy all files from the old server to the new server, taking precaution to
879 preserve all file ownership and permissions as well as any POSIX ACLs that
880 may have been created on the old server.
881 </p></li></ul></div><p>
882 When replacing a Samba domain controller (PDC or BDC) that uses LDAP, the new server
883 need simply be configured to use the LDAP directory, and for the rest it should just
884 work. The domain SID is obtained from the LDAP directory as part of the first connect
885 to the LDAP directory server.
886 </p><p>
887 All Samba servers, other than one that uses LDAP, depend on the tdb files, and
888 particularly on the <code class="filename">secrets.tdb</code> file. So long as the tdb files are
889 all in place, the <code class="filename">smb.conf</code> file is preserved, and either the hostname is identical
890 or the <em class="parameter"><code>netbios name</code></em> is set to the original server name, Samba
891 should correctly pick up the original SID and preserve all other settings. It is
892 sound advice to validate this before turning the system over to users.
893 </p></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2605434"></a>Migration of Samba Accounts to Active Directory</h3></div></div></div><p>
894 Yes, it works. The Windows ADMT tool can be used to migrate Samba accounts
895 to MS Active Directory. There are a few pitfalls to be aware of:
896 </p><div class="procedure"><a name="id2605446"></a><p class="title"><b>Procedure 8.2. Migration to Active Directory</b></p><ol type="1"><li><p>
897 Administrator password must be THE SAME on the Samba server,
898 the 2003 ADS, and the local Administrator account on the workstations.
899 Perhaps this goes without saying, but there needs to be an account
901 full administrative (root) rights to that domain.
902 </p></li><li><p>
903 In the Advanced/DNS section of the TCP/IP settings on your Windows
905 connection</code></em> field is blank.
906 </p></li><li><p>
907 Because you are migrating from Samba, user passwords cannot be
908 migrated. You'll have to reset everyone's passwords. (If you were
909 migrating from NT4 to ADS, you could migrate passwords as well.)
910 </p><p>
911 To date this has not been attempted with roaming profile support;
912 it has been documented as working with local profiles.
913 </p></li><li><p>
914 Disable the Windows Firewall on all workstations. Otherwise,
915 workstations won't be migrated to the new domain.
916 </p></li><li><p>
918 When migrating machines, always test first (using ADMT's test mode)
919 and satisfy all errors before committing the migration. Note that the
920 test will always fail, because the machine will not have been actually
921 migrated. You'll need to interpret the errors to know whether the
922 failure was due to a problem or simply to the fact that it was just
923 a test.
924 </p></li></ol></div><p>
926 There are some significant benefits of using the ADMT, besides just
927 migrating user accounts. ADMT can be found on the Windows 2003 CD.
929 You can migrate workstations remotely. You can specify that SIDs
930 be simply added instead of replaced, giving you the option of joining a
931 workstation back to the old domain if something goes awry. The
932 workstations will be joined to the new domain.
933 </p></li><li><p>
934 Not only are user accounts migrated from the old domain to the new
935 domain, but ACLs on the workstations are migrated as well. Like SIDs,
936 ACLs can be added instead of replaced.
937 </p></li><li><p>
938 Locally stored user profiles on workstations are migrated as well,
939 presenting almost no disruption to the user. Saved passwords will be
940 lost, just as when you administratively reset the password in Windows ADS.
941 </p></li><li><p>
942 The ADMT lets you test all operations before actually performing the
943 migration. Accounts and workstations can be migrated individually or in
944 batches. User accounts can be safely migrated all at once (since no
945 changes are made on the original domain). It is recommended to migrate only one
946 or two workstations as a test before committing them all.
947 </p></li></ul></div></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="unixclients.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="DMSMig.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ntmigration.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 7. Adding Domain Member Servers and Clients </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 9. Migrating NT4 Domain to Samba-3</td></tr></table></div></body></html>