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| author | Jelmer Vernooij <jelmer@samba.org> | 2003-08-13 06:07:10 +0000 |
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| committer | Jelmer Vernooij <jelmer@samba.org> | 2003-08-13 06:07:10 +0000 |
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diff --git a/docs/htmldocs/passdb.html b/docs/htmldocs/passdb.html deleted file mode 100644 index e627eb015f..0000000000 --- a/docs/htmldocs/passdb.html +++ /dev/null @@ -1,813 +0,0 @@ -<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> -<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter 11. Account Information Databases</title><link rel="stylesheet" href="samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.60.1"><link rel="home" href="index.html" title="SAMBA Project Documentation"><link rel="up" href="optional.html" title="Part III. Advanced Configuration"><link rel="previous" href="NetworkBrowsing.html" title="Chapter 10. Samba / MS Windows Network Browsing Guide"><link rel="next" href="groupmapping.html" title="Chapter 12. Mapping MS Windows and Unix Groups"></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 11. Account Information Databases</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="NetworkBrowsing.html">Prev</a> </td><th width="60%" align="center">Part III. Advanced Configuration</th><td width="20%" align="right"> <a accesskey="n" href="groupmapping.html">Next</a></td></tr></table><hr></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="passdb"></a>Chapter 11. Account Information Databases</h2></div><div><div class="author"><h3 class="author"><span class="firstname">Jelmer</span> <span class="othername">R.</span> <span class="surname">Vernooij</span></h3><div class="affiliation"><span class="orgname">The Samba Team<br></span><div class="address"><p><tt class="email"><<a href="mailto:jelmer@samba.org">jelmer@samba.org</a>></tt></p></div></div></div></div><div><div class="author"><h3 class="author"><span class="firstname">Gerald</span> <span class="othername">(Jerry)</span> <span class="surname">Carter</span></h3><div class="affiliation"><span class="orgname">Samba Team<br></span><div class="address"><p><tt class="email"><<a href="mailto:jerry@samba.org">jerry@samba.org</a>></tt></p></div></div></div></div><div><div class="author"><h3 class="author"><span class="firstname">Jeremy</span> <span class="surname">Allison</span></h3><div class="affiliation"><span class="orgname">Samba Team<br></span><div class="address"><p><tt class="email"><<a href="mailto:jra@samba.org">jra@samba.org</a>></tt></p></div></div></div></div><div><div class="author"><h3 class="author"><span class="firstname">John</span> <span class="othername">H.</span> <span class="surname">Terpstra</span></h3><div class="affiliation"><span class="orgname">Samba Team<br></span><div class="address"><p><tt class="email"><<a href="mailto:jht@samba.org">jht@samba.org</a>></tt></p></div></div></div></div><div><div class="author"><h3 class="author"><span class="firstname">Olivier (lem)</span> <span class="surname">Lemaire</span></h3><div class="affiliation"><span class="orgname">IDEALX<br></span><div class="address"><p><tt class="email"><<a href="mailto:olem@IDEALX.org">olem@IDEALX.org</a>></tt></p></div></div></div></div><div><p class="pubdate">May 24, 2003</p></div></div><div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><a href="passdb.html#id2911689">Features and Benefits</a></dt><dt><a href="passdb.html#id2908580">Technical Information</a></dt><dd><dl><dt><a href="passdb.html#id2908644">Important Notes About Security</a></dt><dt><a href="passdb.html#id2908888">Mapping User Identifiers between MS Windows and Unix</a></dt></dl></dd><dt><a href="passdb.html#id2908943">Account Management Tools</a></dt><dd><dl><dt><a href="passdb.html#id2908975">The smbpasswd Command</a></dt><dt><a href="passdb.html#id2909240">The pdbedit Command</a></dt></dl></dd><dt><a href="passdb.html#id2909374">Password Backends</a></dt><dd><dl><dt><a href="passdb.html#id2909410">Plain Text</a></dt><dt><a href="passdb.html#id2909450">smbpasswd - Encrypted Password Database</a></dt><dt><a href="passdb.html#id2913891">tdbsam</a></dt><dt><a href="passdb.html#id2913919">ldapsam</a></dt><dt><a href="passdb.html#id2915407">MySQL</a></dt><dt><a href="passdb.html#XMLpassdb">XML</a></dt></dl></dd><dt><a href="passdb.html#id2916213">Common Errors</a></dt><dd><dl><dt><a href="passdb.html#id2916220">Users can not logon - Users not in Samba SAM</a></dt><dt><a href="passdb.html#id2916235">Users are being added to the wrong backend database</a></dt><dt><a href="passdb.html#id2916295">auth methods does not work</a></dt></dl></dd></dl></div><p> -Samba-3 implements a new capability to work concurrently with multiple account backends. -The possible new combinations of password backends allows Samba-3 a degree of flexibility -and scalability that previously could be achieved only with MS Windows Active Directory. -This chapter describes the new functionality and how to get the most out of it. -</p><p> -In the course of development of Samba-3, a number of requests were received to provide the -ability to migrate MS Windows NT4 SAM accounts to Samba-3 without the need to provide -matching Unix/Linux accounts. We called this the <span class="emphasis"><em>Non Unix Accounts (NUA)</em></span> -capability. The intent was that an administrator could decide to use the <span class="emphasis"><em>tdbsam</em></span> -backend and by simply specifying <span class="emphasis"><em>"passdb backend = tdbsam_nua, guest"</em></span> -this would allow Samba-3 to implement a solution that did not use Unix accounts per se. Late -in the development cycle, the team doing this work hit upon some obstacles that prevents this -solution from being used. Given the delays with Samba-3 release a decision was made to NOT -deliver this functionality until a better method of recognising NT Group SIDs from NT User -SIDs could be found. This feature may thus return during the life cycle for the Samba-3 series. -</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p> -Samba-3.0.0 does NOT support Non-Unix Account (NUA) operation. -</p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2911689"></a>Features and Benefits</h2></div></div><div></div></div><p> -Samba-3 provides for complete backwards compatibility with Samba-2.2.x functionality -as follows: -</p><div class="variablelist"><p class="title"><b>Backwards Compatibility Backends</b></p><dl><dt><span class="term">Plain Text:</span></dt><dd><p> - This option uses nothing but the Unix/Linux <tt class="filename">/etc/passwd</tt> - style back end. On systems that have PAM (Pluggable Authentication Modules) - support all PAM modules are supported. The behaviour is just as it was with - Samba-2.2.x, and the protocol limitations imposed by MS Windows clients - apply likewise. - </p></dd><dt><span class="term">smbpasswd:</span></dt><dd><p> - This option allows continues use of the <tt class="filename">smbpasswd</tt> - file that maintains a plain ASCII (text) layout that includes the MS Windows - LanMan and NT encrypted passwords as well as a field that stores some - account information. This form of password backend does NOT store any of - the MS Windows NT/200x SAM (Security Account Manager) information needed to - provide the extended controls that are needed for more comprehensive - interoperation with MS Windows NT4 / 200x servers. - </p><p> - This backend should be used only for backwards compatibility with older - versions of Samba. It may be deprecated in future releases. - </p></dd><dt><span class="term">ldapsam_compat (Samba-2.2 LDAP Compatibility):</span></dt><dd><p> - There is a password backend option that allows continued operation with - a existing OpenLDAP backend that uses the Samba-2.2.x LDAP schema extension. - This option is provided primarily as a migration tool, although there is - no reason to force migration at this time. Note that this tool will eventually - be deprecated. - </p></dd></dl></div><p> -Samba-3 introduces the following new password backend capabilities: -</p><div class="variablelist"><p class="title"><b>New Backends</b></p><dl><dt><span class="term">guest:</span></dt><dd><p> - This is <span class="emphasis"><em>always</em></span> required as the last backend specified. - It provides the ability to handle guest account requirements for access to - resources like <i class="parameter"><tt>IPC$</tt></i> which is used for browsing. - </p></dd><dt><span class="term">tdbsam:</span></dt><dd><p> - This backend provides a rich database backend for local servers. This - backend is NOT suitable for multiple domain controller (ie: PDC + one - or more BDC) installations. - </p><p> - The <span class="emphasis"><em>tdbsam</em></span> password backend stores the old <span class="emphasis"><em> - smbpasswd</em></span> information PLUS the extended MS Windows NT / 200x - SAM information into a binary format TDB (trivial database) file. - The inclusion of the extended information makes it possible for Samba-3 - to implement the same account and system access controls that are possible - with MS Windows NT4 and MS Windows 200x based systems. - </p><p> - The inclusion of the <span class="emphasis"><em>tdbsam</em></span> capability is a direct - response to user requests to allow simple site operation without the overhead - of the complexities of running OpenLDAP. It is recommended to use this only - for sites that have fewer than 250 users. For larger sites or implementations - the use of OpenLDAP or of Active Directory integration is strongly recommended. - </p></dd><dt><span class="term">ldapsam:</span></dt><dd><p> - This provides a rich directory backend for distributed account installation. - </p><p> - Samba-3 has a new and extended LDAP implementation that requires configuration - of OpenLDAP with a new format samba schema. The new format schema file is - included in the <tt class="filename">examples/LDAP</tt> directory of the Samba distribution. - </p><p> - The new LDAP implementation significantly expands the control abilities that - were possible with prior versions of Samba. It is now possible to specify - "per user" profile settings, home directories, account access controls, and - much more. Corporate sites will see that the Samba-Team has listened to their - requests both for capability and to allow greater scalability. - </p></dd><dt><span class="term">mysqlsam (MySQL based backend):</span></dt><dd><p> - It is expected that the MySQL based SAM will be very popular in some corners. - This database backend will be on considerable interest to sites that want to - leverage existing MySQL technology. - </p></dd><dt><span class="term">xmlsam (XML based datafile):</span></dt><dd><p> - Allows the account and password data to be stored in an XML format - data file. This backend can not be used for normal operation, it can only - be used in conjunction with <b class="command">pdbedit</b>'s pdb2pdb - functionality. The DTD that is used might be subject to changes in the future. - </p><p> - The xmlsam option can be useful for account migration between database - backends or backups. Use of this tool will allow the data to be edited before migration - into another backend format. - </p></dd><dt><span class="term">nisplussam:</span></dt><dd><p> - The NIS+ based passdb backend. Takes name NIS domain as an - optional argument. Only works with Sun NIS+ servers. - </p></dd></dl></div></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2908580"></a>Technical Information</h2></div></div><div></div></div><p> - Old windows clients send plain text passwords over the wire. Samba can check these - passwords by crypting them and comparing them to the hash stored in the unix user database. - </p><p> - Newer windows clients send encrypted passwords (so-called Lanman and NT hashes) over - the wire, instead of plain text passwords. The newest clients will send only encrypted - passwords and refuse to send plain text passwords, unless their registry is tweaked. - </p><p> - These passwords can't be converted to unix style encrypted passwords. Because of that, - you can't use the standard unix user database, and you have to store the Lanman and NT - hashes somewhere else. - </p><p> - In addition to differently encrypted passwords, windows also stores certain data for each - user that is not stored in a unix user database. e.g: workstations the user may logon from, - the location where the users' profile is stored, and so on. Samba retrieves and stores this - information using a <i class="parameter"><tt>passdb backend</tt></i>. Commonly available backends are LDAP, plain text - file, MySQL and nisplus. For more information, see the man page for <tt class="filename">smb.conf</tt> regarding the - <i class="parameter"><tt>passdb backend</tt></i> parameter. - </p><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2908644"></a>Important Notes About Security</h3></div></div><div></div></div><p> - The unix and SMB password encryption techniques seem similar on the surface. This - similarity is, however, only skin deep. The unix scheme typically sends clear text - passwords over the network when logging in. This is bad. The SMB encryption scheme - never sends the cleartext password over the network but it does store the 16 byte - hashed values on disk. This is also bad. Why? Because the 16 byte hashed values - are a "password equivalent". You cannot derive the user's password from them, but - they could potentially be used in a modified client to gain access to a server. - This would require considerable technical knowledge on behalf of the attacker but - is perfectly possible. You should thus treat the data stored in whatever passdb - backend you use (smbpasswd file, ldap, mysql) as though it contained the cleartext - passwords of all your users. Its contents must be kept secret, and the file should - be protected accordingly. - </p><p> - Ideally we would like a password scheme that involves neither plain text passwords - on the net nor on disk. Unfortunately this is not available as Samba is stuck with - having to be compatible with other SMB systems (WinNT, WfWg, Win95 etc). - </p><p> - Windows NT 4.0 Service pack 3 changed the default setting so that plaintext passwords - are disabled from being sent over the wire. This mandates either the use of encrypted - password support or edit the Windows NT registry to re-enable plaintext passwords. - </p><p> - The following versions of MS Windows do not support full domain security protocols, - although they may log onto a domain environment: - </p><table class="simplelist" border="0" summary="Simple list"><tr><td>MS DOS Network client 3.0 with the basic network redirector installed</td></tr><tr><td>Windows 95 with the network redirector update installed</td></tr><tr><td>Windows 98 [se]</td></tr><tr><td>Windows Me</td></tr></table><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p> - MS Windows XP Home does not have facilities to become a domain member and it can - not participate in domain logons. - </p></div><p> - The following versions of MS Windows fully support domain security protocols. - </p><table class="simplelist" border="0" summary="Simple list"><tr><td>Windows NT 3.5x</td></tr><tr><td>Windows NT 4.0</td></tr><tr><td>Windows 2000 Professional</td></tr><tr><td>Windows 200x Server/Advanced Server</td></tr><tr><td>Windows XP Professional</td></tr></table><p> - All current release of Microsoft SMB/CIFS clients support authentication via the - SMB Challenge/Response mechanism described here. Enabling clear text authentication - does not disable the ability of the client to participate in encrypted authentication. - Instead, it allows the client to negotiate either plain text _or_ encrypted password - handling. - </p><p> - MS Windows clients will cache the encrypted password alone. Where plain text passwords - are re-enabled, through the appropriate registry change, the plain text password is NEVER - cached. This means that in the event that a network connections should become disconnected - (broken) only the cached (encrypted) password will be sent to the resource server to - affect a auto-reconnect. If the resource server does not support encrypted passwords the - auto-reconnect will fail. <span class="emphasis"><em>USE OF ENCRYPTED PASSWORDS IS STRONGLY ADVISED.</em></span> - </p><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2908797"></a>Advantages of Encrypted Passwords</h4></div></div><div></div></div><div class="itemizedlist"><ul type="disc"><li><p>Plain text passwords are not passed across - the network. Someone using a network sniffer cannot just - record passwords going to the SMB server.</p></li><li><p>Plain text passwords are not stored anywhere in - memory or on disk.</p></li><li><p>WinNT doesn't like talking to a server - that does not support encrypted passwords. It will refuse - to browse the server if the server is also in user level - security mode. It will insist on prompting the user for the - password on each connection, which is very annoying. The - only things you can do to stop this is to use SMB encryption. - </p></li><li><p>Encrypted password support allows automatic share - (resource) reconnects.</p></li><li><p>Encrypted passwords are essential for PDC/BDC - operation.</p></li></ul></div></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2908851"></a>Advantages of non-encrypted passwords</h4></div></div><div></div></div><div class="itemizedlist"><ul type="disc"><li><p>Plain text passwords are not kept - on disk, and are NOT cached in memory. </p></li><li><p>Uses same password file as other unix - services such as login and ftp</p></li><li><p>Use of other services (such as telnet and ftp) which - send plain text passwords over the net, so sending them for SMB - isn't such a big deal.</p></li></ul></div></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2908888"></a>Mapping User Identifiers between MS Windows and Unix</h3></div></div><div></div></div><p> - Every operation in Unix/Linux requires a user identifier (UID), just as in - MS Windows NT4 / 200x this requires a Security Identifier (SID). Samba provides - two means for mapping an MS Windows user to a Unix/Linux UID. - </p><p> - Firstly, all Samba SAM (Security Account Manager database) accounts require - a Unix/Linux UID that the account will map to. As users are added to the account - information database, Samba-3 will call the <i class="parameter"><tt>add user script</tt></i> - interface to add the account to the Samba host OS. In essence, all accounts in - the local SAM require a local user account. - </p><p> - The second way to affect Windows SID to Unix UID mapping is via the - <span class="emphasis"><em>idmap uid, idmap gid</em></span> parameters in <tt class="filename">smb.conf</tt>. - Please refer to the man page for information about these parameters. - These parameters are essential when mapping users from a remote SAM server. - </p></div></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2908943"></a>Account Management Tools</h2></div></div><div></div></div><p> -Samba-3 provides two (2) tools for management of User and machine accounts. These tools are -called <b class="command">smbpasswd</b> and <b class="command">pdbedit</b>. A third tool is under -development but is NOT expected to ship in time for Samba-3.0.0. The new tool will be a TCL/TK -GUI tool that looks much like the MS Windows NT4 Domain User Manager - hopefully this will -be announced in time for the Samba-3.0.1 release. -</p><div xmlns:ns22="" class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2908975"></a>The <span class="emphasis"><em>smbpasswd</em></span> Command</h3></div></div><div></div></div><p> - The smbpasswd utility is a utility similar to the <b class="command">passwd</b> - or <b class="command">yppasswd</b> programs. It maintains the two 32 byte password - fields in the passdb backend. - </p><p> - <b class="command">smbpasswd</b> works in a client-server mode where it contacts the - local smbd to change the user's password on its behalf. This has enormous benefits - as follows: - </p><p> - <b class="command">smbpasswd</b> has the capability to change passwords on Windows NT - servers (this only works when the request is sent to the NT Primary Domain Controller - if changing an NT Domain user's password). - </p><p> - <b class="command">smbpasswd</b> can be used to: - </p><table class="simplelist" border="0" summary="Simple list"><tr><td><span class="emphasis"><em>add</em></span> user or machine accounts</td></tr><tr><td><span class="emphasis"><em>delete</em></span> user or machine accounts</td></tr><tr><td><span class="emphasis"><em>enable</em></span> user or machine accounts</td></tr><tr><td><span class="emphasis"><em>disable</em></span> user or machine accounts</td></tr><tr><td><span class="emphasis"><em>set to NULL</em></span> user passwords</td></tr><tr><td><span class="emphasis"><em>manage interdomain trust accounts</em></span></td></tr></table><p> - To run smbpasswd as a normal user just type: - </p><ns22:p> - </ns22:p><pre class="screen"> - <tt class="prompt">$ </tt><b class="userinput"><tt>smbpasswd</tt></b> - <tt class="prompt">Old SMB password: </tt><b class="userinput"><tt><i class="replaceable"><tt>secret</tt></i></tt></b> - </pre><ns22:p> - For <i class="replaceable"><tt>secret</tt></i> type old value here - or hit return if - there was no old password - </ns22:p><pre class="screen"> - <tt class="prompt">New SMB Password: </tt><b class="userinput"><tt><i class="replaceable"><tt>new secret</tt></i></tt></b> - <tt class="prompt">Repeat New SMB Password: </tt><b class="userinput"><tt><i class="replaceable"><tt>new secret</tt></i></tt></b> - </pre><ns22:p> - </ns22:p><p> - If the old value does not match the current value stored for that user, or the two - new values do not match each other, then the password will not be changed. - </p><p> - When invoked by an ordinary user it will only allow change of their own - SMB password. - </p><p> - When run by root smbpasswd may take an optional argument, specifying - the user name whose SMB password you wish to change. When run as root, smbpasswd - does not prompt for or check the old password value, thus allowing root to set passwords - for users who have forgotten their passwords. - </p><p> - <b class="command">smbpasswd</b> is designed to work in the way familiar to UNIX - users who use the <b class="command">passwd</b> or <b class="command">yppasswd</b> commands. - While designed for administrative use, this tool provides essential user level - password change capabilities. - </p><p> - For more details on using <b class="command">smbpasswd</b> refer to the man page (the - definitive reference). - </p></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2909240"></a>The <span class="emphasis"><em>pdbedit</em></span> Command</h3></div></div><div></div></div><p> - <b class="command">pdbedit</b> is a tool that can be used only by root. It is used to - manage the passdb backend. <b class="command">pdbedit</b> can be used to: - </p><table class="simplelist" border="0" summary="Simple list"><tr><td>add, remove or modify user accounts</td></tr><tr><td>listing user accounts</td></tr><tr><td>migrate user accounts</td></tr></table><p> - The <b class="command">pdbedit</b> tool is the only one that can manage the account - security and policy settings. It is capable of all operations that smbpasswd can - do as well as a super set of them. - </p><p> - One particularly important purpose of the <b class="command">pdbedit</b> is to allow - the migration of account information from one passdb backend to another. See the - <a href="passdb.html#XMLpassdb" title="XML">XML</a> password backend section of this chapter. - </p><p> - The following is an example of the user account information that is stored in - a tdbsam password backend. This listing was produced by running: - </p><pre class="screen"> - <tt class="prompt">$ </tt><b class="userinput"><tt>pdbedit -Lv met</tt></b> - Unix username: met - NT username: - Account Flags: [UX ] - User SID: S-1-5-21-1449123459-1407424037-3116680435-2004 - Primary Group SID: S-1-5-21-1449123459-1407424037-3116680435-1201 - Full Name: Melissa E Terpstra - Home Directory: \\frodo\met\Win9Profile - HomeDir Drive: H: - Logon Script: scripts\logon.bat - Profile Path: \\frodo\Profiles\met - Domain: MIDEARTH - Account desc: - Workstations: melbelle - Munged dial: - Logon time: 0 - Logoff time: Mon, 18 Jan 2038 20:14:07 GMT - Kickoff time: Mon, 18 Jan 2038 20:14:07 GMT - Password last set: Sat, 14 Dec 2002 14:37:03 GMT - Password can change: Sat, 14 Dec 2002 14:37:03 GMT - Password must change: Mon, 18 Jan 2038 20:14:07 GMT - </pre></div></div><div xmlns:ns23="" class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2909374"></a>Password Backends</h2></div></div><div></div></div><p> -Samba-3 offers the greatest flexibility in backend account database design of any SMB/CIFS server -technology available today. The flexibility is immediately obvious as one begins to explore this -capability. -</p><p> -It is possible to specify not only multiple different password backends, but even multiple -backends of the same type. For example, to use two different tdbsam databases: -</p><ns23:p> -</ns23:p><pre class="programlisting"> -[globals] - passdb backend = tdbsam:/etc/samba/passdb.tdb, \ - tdbsam:/etc/samba/old-passdb.tdb, guest -</pre><ns23:p> -</ns23:p><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2909410"></a>Plain Text</h3></div></div><div></div></div><p> - Older versions of Samba retrieved user information from the unix user database - and eventually some other fields from the file <tt class="filename">/etc/samba/smbpasswd</tt> - or <tt class="filename">/etc/smbpasswd</tt>. When password encryption is disabled, no - SMB specific data is stored at all. Instead all operations are conducted via the way - that the Samba host OS will access its <tt class="filename">/etc/passwd</tt> database. - eg: On Linux systems that is done via PAM. - </p></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2909450"></a>smbpasswd - Encrypted Password Database</h3></div></div><div></div></div><p> - Traditionally, when configuring <a href="smb.conf.5.html#ENCRYPTPASSWORDS" target="_top">encrypt - passwords = yes</a> in Samba's <tt class="filename">smb.conf</tt> file, user account - information such as username, LM/NT password hashes, password change times, and account - flags have been stored in the <tt class="filename">smbpasswd(5)</tt> file. There are several - disadvantages to this approach for sites with very large numbers of users (counted - in the thousands). - </p><div class="itemizedlist"><ul type="disc"><li><p> - The first is that all lookups must be performed sequentially. Given that - there are approximately two lookups per domain logon (one for a normal - session connection such as when mapping a network drive or printer), this - is a performance bottleneck for large sites. What is needed is an indexed approach - such as is used in databases. - </p></li><li><p> - The second problem is that administrators who desire to replicate a smbpasswd file - to more than one Samba server were left to use external tools such as - <b class="command">rsync(1)</b> and <b class="command">ssh(1)</b> and wrote custom, - in-house scripts. - </p></li><li><p> - And finally, the amount of information which is stored in an smbpasswd entry leaves - no room for additional attributes such as a home directory, password expiration time, - or even a Relative Identifier (RID). - </p></li></ul></div><p> - As a result of these deficiencies, a more robust means of storing user attributes - used by smbd was developed. The API which defines access to user accounts - is commonly referred to as the samdb interface (previously this was called the passdb - API, and is still so named in the Samba CVS trees). - </p><p> - Samba-3 provides an enhanced set of passdb backends that overcome the deficiencies - of the smbpasswd plain text database. These are tdbsam, ldapsam, and xmlsam. - Of these ldapsam will be of most interest to large corporate or enterprise sites. - </p></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2913891"></a>tdbsam</h3></div></div><div></div></div><p>Samba can store user and machine account data in a "TDB" (Trivial Database). - Using this backend doesn't require any additional configuration. This backend is - recommended for new installations that do not require LDAP. - </p><p> - As a general guide the Samba-Team does NOT recommend using the tdbsam backend for sites - that have 250 or more users. Additionally, tdbsam is not capable of scaling for use - in sites that require PDB/BDC implementations that requires replication of the account - database. Clearly, for reason of scalability, the use of ldapsam should be encouraged. - </p></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2913919"></a>ldapsam</h3></div></div><div></div></div><p> - There are a few points to stress that the ldapsam does not provide. The LDAP - support referred to in the this documentation does not include: - </p><div class="itemizedlist"><ul type="disc"><li><p>A means of retrieving user account information from - an Windows 200x Active Directory server.</p></li><li><p>A means of replacing /etc/passwd.</p></li></ul></div><p> - The second item can be accomplished by using LDAP NSS and PAM modules. LGPL - versions of these libraries can be obtained from PADL Software - (<a href="http://www.padl.com/" target="_top">http://www.padl.com/</a>). More - information about the configuration of these packages may be found at "LDAP, - System Administration; Gerald Carter, O'Reilly; Chapter 6: Replacing NIS". - Refer to <a href="http://safari.oreilly.com/?XmlId=1-56592-491-6" target="_top"> - http://safari.oreilly.com/?XmlId=1-56592-491-6</a> for those who might wish to know - more about configuration and administration of an OpenLDAP server. - </p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p> - This section is outdated for Samba-3 schema. Samba-3 introduces a new schema - that has not been documented at the time of this publication. - </p></div><p> - This document describes how to use an LDAP directory for storing Samba user - account information traditionally stored in the smbpasswd(5) file. It is - assumed that the reader already has a basic understanding of LDAP concepts - and has a working directory server already installed. For more information - on LDAP architectures and Directories, please refer to the following sites. - </p><div class="itemizedlist"><ul type="disc"><li><p>OpenLDAP - <a href="http://www.openldap.org/" target="_top">http://www.openldap.org/</a></p></li><li><p>iPlanet Directory Server - - <a href="http://iplanet.netscape.com/directory" target="_top">http://iplanet.netscape.com/directory</a></p></li></ul></div><p> - Two additional Samba resources which may prove to be helpful are - </p><div class="itemizedlist"><ul type="disc"><li><p>The <a href="http://www.unav.es/cti/ldap-smb/ldap-smb-3-howto.html" target="_top">Samba-PDC-LDAP-HOWTO</a> - maintained by Ignacio Coupeau.</p></li><li><p>The NT migration scripts from <a href="http://samba.idealx.org/" target="_top">IDEALX</a> that are - geared to manage users and group in such a Samba-LDAP Domain Controller configuration. - </p></li></ul></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2914068"></a>Supported LDAP Servers</h4></div></div><div></div></div><p> - The LDAP ldapsam code has been developed and tested using the OpenLDAP 2.0 and 2.1 server and - client libraries. The same code should work with Netscape's Directory Server and client SDK. - However, there are bound to be compile errors and bugs. These should not be hard to fix. - Please submit fixes via <a href="bugreport.html" title="Chapter 35. Reporting Bugs">Bug reporting facility</a>. - </p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2914093"></a>Schema and Relationship to the RFC 2307 posixAccount</h4></div></div><div></div></div><p> - Samba 3.0 includes the necessary schema file for OpenLDAP 2.0 in - <tt class="filename">examples/LDAP/samba.schema</tt>. The sambaSamAccount objectclass is given here: - </p><ns23:p> -</ns23:p><pre class="programlisting"> -objectclass ( 1.3.6.1.4.1.7165.2.2.3 NAME 'sambaSamAccount' SUP top AUXILIARY - DESC 'Samba Auxiliary Account' - MUST ( uid $ rid ) - MAY ( cn $ lmPassword $ ntPassword $ pwdLastSet $ logonTime $ - logoffTime $ kickoffTime $ pwdCanChange $ pwdMustChange $ acctFlags $ - displayName $ smbHome $ homeDrive $ scriptPath $ profilePath $ - description $ userWorkstations $ primaryGroupID $ domain )) -</pre><ns23:p> -</ns23:p><p> - The <tt class="filename">samba.schema</tt> file has been formatted for OpenLDAP 2.0/2.1. - The OID's are owned by the Samba Team and as such is legal to be openly published. - If you translate the schema to be used with Netscape DS, please - submit the modified schema file as a patch to - <a href="mailto:jerry@samba.org" target="_top">jerry@samba.org</a>. - </p><p> - Just as the smbpasswd file is meant to store information which supplements a - user's <tt class="filename">/etc/passwd</tt> entry, so is the sambaSamAccount object - meant to supplement the UNIX user account information. A sambaSamAccount is a - <tt class="constant">STRUCTURAL</tt> objectclass so it can be stored individually - in the directory. However, there are several fields (e.g. uid) which overlap - with the posixAccount objectclass outlined in RFC2307. This is by design. - </p><p> - In order to store all user account information (UNIX and Samba) in the directory, - it is necessary to use the sambaSamAccount and posixAccount objectclasses in - combination. However, smbd will still obtain the user's UNIX account - information via the standard C library calls (e.g. getpwnam(), et. al.). - This means that the Samba server must also have the LDAP NSS library installed - and functioning correctly. This division of information makes it possible to - store all Samba account information in LDAP, but still maintain UNIX account - information in NIS while the network is transitioning to a full LDAP infrastructure. - </p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2914202"></a>OpenLDAP configuration</h4></div></div><div></div></div><p> - To include support for the sambaSamAccount object in an OpenLDAP directory - server, first copy the samba.schema file to slapd's configuration directory. - The samba.schema file can be found in the directory <tt class="filename">examples/LDAP</tt> - in the samba source distribution. - </p><ns23:p> -</ns23:p><pre class="screen"> -<tt class="prompt">root# </tt><b class="userinput"><tt>cp samba.schema /etc/openldap/schema/</tt></b> -</pre><ns23:p> -</ns23:p><p> - Next, include the <tt class="filename">samba.schema</tt> file in <tt class="filename">slapd.conf</tt>. - The sambaSamAccount object contains two attributes which depend upon other schema - files. The 'uid' attribute is defined in <tt class="filename">cosine.schema</tt> and - the 'displayName' attribute is defined in the <tt class="filename">inetorgperson.schema</tt> - file. Both of these must be included before the <tt class="filename">samba.schema</tt> file. - </p><ns23:p> -</ns23:p><pre class="programlisting"> -## /etc/openldap/slapd.conf - -## schema files (core.schema is required by default) -include /etc/openldap/schema/core.schema - -## needed for sambaSamAccount -include /etc/openldap/schema/cosine.schema -include /etc/openldap/schema/inetorgperson.schema -include /etc/openldap/schema/samba.schema -include /etc/openldap/schema/nis.schema -.... -</pre><ns23:p> -</ns23:p><p> - It is recommended that you maintain some indices on some of the most useful attributes, - like in the following example, to speed up searches made on sambaSamAccount objectclasses - (and possibly posixAccount and posixGroup as well). - </p><ns23:p> -</ns23:p><pre class="screen"> -# Indices to maintain -## required by OpenLDAP -index objectclass eq - -index cn pres,sub,eq -index sn pres,sub,eq -## required to support pdb_getsampwnam -index uid pres,sub,eq -## required to support pdb_getsambapwrid() -index displayName pres,sub,eq - -## uncomment these if you are storing posixAccount and -## posixGroup entries in the directory as well -##index uidNumber eq -##index gidNumber eq -##index memberUid eq - -index sambaSID eq -index sambaPrimaryGroupSID eq -index sambaDomainName eq -index default sub -</pre><ns23:p> -</ns23:p><p> - Create the new index by executing: - </p><ns23:p> -</ns23:p><pre class="screen"> -./sbin/slapindex -f slapd.conf -</pre><ns23:p> -</ns23:p><p> - Remember to restart slapd after making these changes: - </p><ns23:p> -</ns23:p><pre class="screen"> -<tt class="prompt">root# </tt><b class="userinput"><tt>/etc/init.d/slapd restart</tt></b> -</pre><ns23:p> -</ns23:p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2914390"></a>Initialise the LDAP database</h4></div></div><div></div></div><p> - Before you can add accounts to the LDAP database you must create the account containers - that they will be stored in. The following LDIF file should be modified to match your - needs (ie: Your DNS entries, etc.). - </p><ns23:p> -</ns23:p><pre class="screen"> -# Organization for Samba Base -dn: dc=plainjoe,dc=org -objectclass: dcObject -objectclass: organization -dc: plainjoe -o: Terpstra Org Network -description: The Samba-3 Network LDAP Example - -# Organizational Role for Directory Management -dn: cn=Manager,dc=plainjoe,dc=org -objectclass: organizationalRole -cn: Manager -description: Directory Manager - -# Setting up container for users -dn: ou=People,dc=plainjoe,dc=org -objectclass: top -objectclass: organizationalUnit -ou: People - -# Setting up admin handle for People OU -dn: cn=admin,ou=People,dc=plainjoe,dc=org -cn: admin -objectclass: top -objectclass: organizationalRole -objectclass: simpleSecurityObject -userPassword: {SSHA}c3ZM9tBaBo9autm1dL3waDS21+JSfQVz -</pre><ns23:p> -</ns23:p><p> - The userPassword shown above should be generated using <b class="command">slappasswd</b>. - </p><p> - The following command will then load the contents of the LDIF file into the LDAP - database. - </p><ns23:p> -</ns23:p><pre class="screen"> -<tt class="prompt">$ </tt><b class="userinput"><tt>slapadd -v -l initldap.dif</tt></b> -</pre><ns23:p> -</ns23:p><p> - Do not forget to secure your LDAP server with an adequate access control list, - as well as an admin password. - </p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><ns23:p> - Before Samba can access the LDAP server you need to store the LDAP admin password - into the Samba-3 <tt class="filename">secrets.tdb</tt> database by: - </ns23:p><pre class="screen"> -<tt class="prompt">root# </tt> <b class="userinput"><tt>smbpasswd -w <i class="replaceable"><tt>secret</tt></i></tt></b> - </pre><ns23:p> - </ns23:p></div></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2914519"></a>Configuring Samba</h4></div></div><div></div></div><p> - The following parameters are available in smb.conf only if your - version of samba was built with LDAP support. Samba automatically builds with LDAP support if the - LDAP libraries are found. - </p><div class="itemizedlist"><ul type="disc"><li><p><a href="smb.conf.5.html#PASSDBBACKEND" target="_top">passdb backend = ldapsam:url</a></p></li><li><p><a href="smb.conf.5.html#LDAPSSL" target="_top">ldap ssl</a></p></li><li><p><a href="smb.conf.5.html#LDAPADMINDN" target="_top">ldap admin dn</a></p></li><li><p><a href="smb.conf.5.html#LDAPSUFFIX" target="_top">ldap suffix</a></p></li><li><p><a href="smb.conf.5.html#LDAPFILTER" target="_top">ldap filter</a></p></li><li><p><a href="smb.conf.5.html#LDAPMACHINSUFFIX" target="_top">ldap machine suffix</a></p></li><li><p><a href="smb.conf.5.html#LDAPUSERSUFFIX" target="_top">ldap user suffix</a></p></li><li><p><a href="smb.conf.5.html#LDAPDELETEDN" target="_top">ldap delete dn</a></p></li><li><p><a href="smb.conf.5.html#LDAPPASSWDSYNC" target="_top">ldap passwd sync</a></p></li><li><p><a href="smb.conf.5.html#LDAPTRUSTIDS" target="_top">ldap trust ids</a></p></li></ul></div><p> - These are described in the <tt class="filename">smb.conf</tt> man - page and so will not be repeated here. However, a sample smb.conf file for - use with an LDAP directory could appear as - </p><ns23:p> -</ns23:p><pre class="programlisting"> -## /usr/local/samba/lib/smb.conf -[global] - security = user - encrypt passwords = yes - - netbios name = TASHTEGO - workgroup = NARNIA - - # ldap related parameters - - # define the DN to use when binding to the directory servers - # The password for this DN is not stored in smb.conf. Rather it - # must be set by using 'smbpasswd -w <i class="replaceable"><tt>secretpw</tt></i>' to store the - # passphrase in the secrets.tdb file. If the "ldap admin dn" values - # change, this password will need to be reset. - ldap admin dn = "cn=Samba Manager,ou=people,dc=samba,dc=org" - - # Define the SSL option when connecting to the directory - # ('off', 'start tls', or 'on' (default)) - ldap ssl = start tls - - # syntax: passdb backend = ldapsam:ldap://server-name[:port] - passdb backend = ldapsam:ldap://funball.samba.org, guest - - # smbpasswd -x delete the entire dn-entry - ldap delete dn = no - - # the machine and user suffix added to the base suffix - # wrote WITHOUT quotes. NULL suffixes by default - ldap user suffix = ou=People - ldap machine suffix = ou=Systems - - # Trust unix account information in LDAP - # (see the smb.conf manpage for details) - ldap trust ids = Yes - - # specify the base DN to use when searching the directory - ldap suffix = "ou=people,dc=samba,dc=org" - - # generally the default ldap search filter is ok - # ldap filter = "(&(uid=%u)(objectclass=sambaSamAccount))" -</pre><ns23:p> -</ns23:p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2914697"></a>Accounts and Groups management</h4></div></div><div></div></div><p> - As users accounts are managed through the sambaSamAccount objectclass, you should - modify your existing administration tools to deal with sambaSamAccount attributes. - </p><p> - Machines accounts are managed with the sambaSamAccount objectclass, just - like users accounts. However, it's up to you to store those accounts - in a different tree of your LDAP namespace: you should use - "ou=Groups,dc=plainjoe,dc=org" to store groups and - "ou=People,dc=plainjoe,dc=org" to store users. Just configure your - NSS and PAM accordingly (usually, in the /etc/ldap.conf configuration - file). - </p><p> - In Samba release 3.0, the group management system is based on POSIX - groups. This means that Samba makes use of the posixGroup objectclass. - For now, there is no NT-like group system management (global and local - groups). - </p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2914734"></a>Security and sambaSamAccount</h4></div></div><div></div></div><p> - There are two important points to remember when discussing the security - of sambaSamAccount entries in the directory. - </p><div class="itemizedlist"><ul type="disc"><li><p><span class="emphasis"><em>Never</em></span> retrieve the lmPassword or - ntPassword attribute values over an unencrypted LDAP session.</p></li><li><p><span class="emphasis"><em>Never</em></span> allow non-admin users to - view the lmPassword or ntPassword attribute values.</p></li></ul></div><p> - These password hashes are clear text equivalents and can be used to impersonate - the user without deriving the original clear text strings. For more information - on the details of LM/NT password hashes, refer to the - <a href="passdb.html" title="Chapter 11. Account Information Databases">Account Information Database</a> section of this chapter. - </p><p> - To remedy the first security issue, the <i class="parameter"><tt>ldap ssl</tt></i> <tt class="filename">smb.conf</tt> parameter defaults - to require an encrypted session (<i class="parameter"><tt>ldap ssl = on</tt></i>) using - the default port of <tt class="constant">636</tt> - when contacting the directory server. When using an OpenLDAP server, it - is possible to use the use the StartTLS LDAP extended operation in the place of - LDAPS. In either case, you are strongly discouraged to disable this security - (<i class="parameter"><tt>ldap ssl = off</tt></i>). - </p><p> - Note that the LDAPS protocol is deprecated in favor of the LDAPv3 StartTLS - extended operation. However, the OpenLDAP library still provides support for - the older method of securing communication between clients and servers. - </p><p> - The second security precaution is to prevent non-administrative users from - harvesting password hashes from the directory. This can be done using the - following ACL in <tt class="filename">slapd.conf</tt>: - </p><ns23:p> -</ns23:p><pre class="programlisting"> -## allow the "ldap admin dn" access, but deny everyone else -access to attrs=lmPassword,ntPassword - by dn="cn=Samba Admin,ou=people,dc=plainjoe,dc=org" write - by * none -</pre><ns23:p> -</ns23:p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2914869"></a>LDAP special attributes for sambaSamAccounts</h4></div></div><div></div></div><p> - The sambaSamAccount objectclass is composed of the following attributes: - </p><ns23:p> - </ns23:p><div class="table"><a name="id2914885"></a><p class="title"><b>Table 11.1. Attributes in the sambaSamAccount objectclass (LDAP)</b></p><table summary="Attributes in the sambaSamAccount objectclass (LDAP)" border="1"><colgroup><col><col></colgroup><tbody><tr><td align="left"><tt class="constant">lmPassword</tt></td><td align="left">the LANMAN password 16-byte hash stored as a character - representation of a hexadecimal string.</td></tr><tr><td align="left"><tt class="constant">ntPassword</tt></td><td align="left">the NT password hash 16-byte stored as a character - representation of a hexadecimal string.</td></tr><tr><td align="left"><tt class="constant">pwdLastSet</tt></td><td align="left">The integer time in seconds since 1970 when the - <tt class="constant">lmPassword</tt> and <tt class="constant">ntPassword</tt> attributes were last set. - </td></tr><tr><td align="left"><tt class="constant">acctFlags</tt></td><td align="left">string of 11 characters surrounded by square brackets [] - representing account flags such as U (user), W(workstation), X(no password expiration), - I(Domain trust account), H(Home dir required), S(Server trust account), - and D(disabled).</td></tr><tr><td align="left"><tt class="constant">logonTime</tt></td><td align="left">Integer value currently unused</td></tr><tr><td align="left"><tt class="constant">logoffTime</tt></td><td align="left">Integer value currently unused</td></tr><tr><td align="left"><tt class="constant">kickoffTime</tt></td><td align="left">Integer value currently unused</td></tr><tr><td align="left"><tt class="constant">pwdCanChange</tt></td><td align="left">Integer value currently unused</td></tr><tr><td align="left"><tt class="constant">pwdMustChange</tt></td><td align="left">Integer value currently unused</td></tr><tr><td align="left"><tt class="constant">homeDrive</tt></td><td align="left">specifies the drive letter to which to map the - UNC path specified by homeDirectory. The drive letter must be specified in the form "X:" - where X is the letter of the drive to map. Refer to the "logon drive" parameter in the - smb.conf(5) man page for more information.</td></tr><tr><td align="left"><tt class="constant">scriptPath</tt></td><td align="left">The scriptPath property specifies the path of - the user's logon script, .CMD, .EXE, or .BAT file. The string can be null. The path - is relative to the netlogon share. Refer to the "logon script" parameter in the - smb.conf(5) man page for more information.</td></tr><tr><td align="left"><tt class="constant">profilePath</tt></td><td align="left">specifies a path to the user's profile. - This value can be a null string, a local absolute path, or a UNC path. Refer to the - "logon path" parameter in the smb.conf(5) man page for more information.</td></tr><tr><td align="left"><tt class="constant">smbHome</tt></td><td align="left">The homeDirectory property specifies the path of - the home directory for the user. The string can be null. If homeDrive is set and specifies - a drive letter, homeDirectory should be a UNC path. The path must be a network - UNC path of the form <tt class="filename">\\server\share\directory</tt>. This value can be a null string. - Refer to the <b class="command">logon home</b> parameter in the <tt class="filename">smb.conf</tt> man page for more information. - </td></tr><tr><td align="left"><tt class="constant">userWorkstation</tt></td><td align="left">character string value currently unused. - </td></tr><tr><td align="left"><tt class="constant">rid</tt></td><td align="left">the integer representation of the user's relative identifier - (RID).</td></tr><tr><td align="left"><tt class="constant">primaryGroupID</tt></td><td align="left">the relative identifier (RID) of the primary group - of the user.</td></tr><tr><td align="left"><tt class="constant">domain</tt></td><td align="left">domain the user is part of.</td></tr></tbody></table></div><ns23:p> - </ns23:p><p> - The majority of these parameters are only used when Samba is acting as a PDC of - a domain (refer to the <a href="samba-pdc.html" title="Chapter 5. Domain Control">Samba as a primary domain controller</a> chapter for details on - how to configure Samba as a Primary Domain Controller). The following four attributes - are only stored with the sambaSamAccount entry if the values are non-default values: - </p><table class="simplelist" border="0" summary="Simple list"><tr><td>smbHome</td></tr><tr><td>scriptPath</td></tr><tr><td>logonPath</td></tr><tr><td>homeDrive</td></tr></table><p> - These attributes are only stored with the sambaSamAccount entry if - the values are non-default values. For example, assume TASHTEGO has now been - configured as a PDC and that <i class="parameter"><tt>logon home = \\%L\%u</tt></i> was defined in - its <tt class="filename">smb.conf</tt> file. When a user named "becky" logons to the domain, - the <i class="parameter"><tt>logon home</tt></i> string is expanded to \\TASHTEGO\becky. - If the smbHome attribute exists in the entry "uid=becky,ou=people,dc=samba,dc=org", - this value is used. However, if this attribute does not exist, then the value - of the <i class="parameter"><tt>logon home</tt></i> parameter is used in its place. Samba - will only write the attribute value to the directory entry if the value is - something other than the default (e.g. <tt class="filename">\\MOBY\becky</tt>). - </p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2915232"></a>Example LDIF Entries for a sambaSamAccount</h4></div></div><div></div></div><p> - The following is a working LDIF with the inclusion of the posixAccount objectclass: - </p><ns23:p> - </ns23:p><pre class="programlisting"> - dn: uid=guest2, ou=people,dc=plainjoe,dc=org - ntPassword: 878D8014606CDA29677A44EFA1353FC7 - pwdMustChange: 2147483647 - primaryGroupID: 1201 - lmPassword: 552902031BEDE9EFAAD3B435B51404EE - pwdLastSet: 1010179124 - logonTime: 0 - objectClass: sambaSamAccount - uid: guest2 - kickoffTime: 2147483647 - acctFlags: [UX ] - logoffTime: 2147483647 - rid: 19006 - pwdCanChange: 0 - </pre><ns23:p> - </ns23:p><p> - The following is an LDIF entry for using both the sambaSamAccount and - posixAccount objectclasses: - </p><ns23:p> - </ns23:p><pre class="programlisting"> - dn: uid=gcarter, ou=people,dc=plainjoe,dc=org - logonTime: 0 - displayName: Gerald Carter - lmPassword: 552902031BEDE9EFAAD3B435B51404EE - primaryGroupID: 1201 - objectClass: posixAccount - objectClass: sambaSamAccount - acctFlags: [UX ] - userPassword: {crypt}BpM2ej8Rkzogo - uid: gcarter - uidNumber: 9000 - cn: Gerald Carter - loginShell: /bin/bash - logoffTime: 2147483647 - gidNumber: 100 - kickoffTime: 2147483647 - pwdLastSet: 1010179230 - rid: 19000 - homeDirectory: /home/tashtego/gcarter - pwdCanChange: 0 - pwdMustChange: 2147483647 - ntPassword: 878D8014606CDA29677A44EFA1353FC7 -</pre><ns23:p> - </ns23:p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2915294"></a>Password synchronisation</h4></div></div><div></div></div><p> - Since version 3.0 samba can update the non-samba (LDAP) password stored with an account. When - using pam_ldap, this allows changing both unix and windows passwords at once. - </p><p>The <i class="parameter"><tt>ldap passwd sync</tt></i> options can have the following values:</p><div class="variablelist"><dl><dt><span class="term">yes</span></dt><dd><p>When the user changes his password, update - <tt class="constant">ntPassword</tt>, <tt class="constant">lmPassword</tt> - and the <tt class="constant">password</tt> fields.</p></dd><dt><span class="term">no</span></dt><dd><p>Only update <tt class="constant">ntPassword</tt> and <tt class="constant">lmPassword</tt>.</p></dd><dt><span class="term">only</span></dt><dd><p>Only update the LDAP password and let the LDAP server worry - about the other fields. This option is only available when the LDAP server supports LDAP_EXOP_X_MODIFY_PASSWD. </p></dd></dl></div><p>More information can be found in the <a href="smb.conf.5.html#LDAPPASSWDSYNC" target="_top">smb.conf</a> manpage. - </p></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2915407"></a>MySQL</h3></div></div><div></div></div><p> - Every so often someone will come along with a great new idea. Storing of user accounts in an - SQL backend is one of them. Those who want to do this are in the best position to know what the - specific benefits are to them. This may sound like a cop-out, but in truth we can not attempt - to document every nitty little detail why certain things of marginal utility to the bulk of - Samba users might make sense to the rest. In any case, the following instructions should help - the determined SQL user to implement a working system. - </p><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2915428"></a>Creating the database</h4></div></div><div></div></div><ns23:p> - You either can set up your own table and specify the field names to pdb_mysql (see below - for the column names) or use the default table. The file <tt class="filename">examples/pdb/mysql/mysql.dump</tt> - contains the correct queries to create the required tables. Use the command : - - </ns23:p><pre class="screen"><tt class="prompt">$ </tt><b class="userinput"><tt>mysql -u<i class="replaceable"><tt>username</tt></i> -h<i class="replaceable"><tt>hostname</tt></i> -p<i class="replaceable"><tt>password</tt></i> \ -<i class="replaceable"><tt>databasename</tt></i> < <tt class="filename">/path/to/samba/examples/pdb/mysql/mysql.dump</tt></tt></b></pre><ns23:p> - </ns23:p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2915492"></a>Configuring</h4></div></div><div></div></div><p>This plugin lacks some good documentation, but here is some short info:</p><ns23:p>Add a the following to the <i class="parameter"><tt>passdb backend</tt></i> variable in your <tt class="filename">smb.conf</tt>: - </ns23:p><pre class="programlisting"> - passdb backend = [other-plugins] mysql:identifier [other-plugins] - </pre><ns23:p> - </ns23:p><p>The identifier can be any string you like, as long as it doesn't collide with - the identifiers of other plugins or other instances of pdb_mysql. If you - specify multiple pdb_mysql.so entries in <i class="parameter"><tt>passdb backend</tt></i>, you also need to - use different identifiers! - </p><p> - Additional options can be given through the <tt class="filename">smb.conf</tt> file in the <i class="parameter"><tt>[global]</tt></i> section. - </p><ns23:p> - </ns23:p><div class="table"><a name="id2915568"></a><p class="title"><b>Table 11.2. Basic smb.conf options for MySQL passdb backend</b></p><table summary="Basic smb.conf options for MySQL passdb backend" border="1"><colgroup><col><col></colgroup><thead><tr><th align="left">Field</th><th align="left">Contents</th></tr></thead><tbody><tr><td align="left">identifier:mysql host</td><td align="left">host name, defaults to 'localhost'</td></tr><tr><td align="left">identifier:mysql password</td><td align="left"> </td></tr><tr><td align="left">identifier:mysql user</td><td align="left">defaults to 'samba'</td></tr><tr><td align="left">identifier:mysql database</td><td align="left">defaults to 'samba'</td></tr><tr><td align="left">identifier:mysql port</td><td align="left">defaults to 3306</td></tr><tr><td align="left">identifier:table</td><td align="left">Name of the table containing users</td></tr></tbody></table></div><ns23:p> - </ns23:p><div class="warning" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Warning</h3><p> - Since the password for the MySQL user is stored in the - <tt class="filename">smb.conf</tt> file, you should make the the <tt class="filename">smb.conf</tt> file - readable only to the user that runs Samba This is considered a security - bug and will be fixed soon. - </p></div><p>Names of the columns in this table (I've added column types those columns should have first):</p><ns23:p> - </ns23:p><div class="table"><a name="id2915693"></a><p class="title"><b>Table 11.3. MySQL field names for MySQL passdb backend</b></p><table summary="MySQL field names for MySQL passdb backend" border="1"><colgroup><col><col><col></colgroup><thead><tr><th align="left">Field</th><th align="left">Type</th><th align="left">Contents</th></tr></thead><tbody><tr><td align="left">identifier:logon time column</td><td align="left">int(9)</td><td align="left"> </td></tr><tr><td align="left">identifier:logoff time column</td><td align="left">int(9)</td><td align="left"> </td></tr><tr><td align="left">identifier:kickoff time column</td><td align="left">int(9)</td><td align="left"> </td></tr><tr><td align="left">identifier:pass last set time column</td><td align="left">int(9)</td><td align="left"> </td></tr><tr><td align="left">identifier:pass can change time column</td><td align="left">int(9)</td><td align="left"> </td></tr><tr><td align="left">identifier:pass must change time column</td><td align="left">int(9)</td><td align="left"> </td></tr><tr><td align="left">identifier:username column</td><td align="left">varchar(255)</td><td align="left">unix username</td></tr><tr><td align="left">identifier:domain column</td><td align="left">varchar(255)</td><td align="left">NT domain user is part of</td></tr><tr><td align="left">identifier:nt username column</td><td align="left">varchar(255)</td><td align="left">NT username</td></tr><tr><td align="left">identifier:fullname column</td><td align="left">varchar(255)</td><td align="left">Full name of user</td></tr><tr><td align="left">identifier:home dir column</td><td align="left">varchar(255)</td><td align="left">Unix homedir path</td></tr><tr><td align="left">identifier:dir drive column</td><td align="left">varchar(2)</td><td align="left">Directory drive path (eg: 'H:')</td></tr><tr><td align="left">identifier:logon script column</td><td align="left">varchar(255)</td><td align="left">Batch file to run on client side when logging on</td></tr><tr><td align="left">identifier:profile path column</td><td align="left">varchar(255)</td><td align="left">Path of profile</td></tr><tr><td align="left">identifier:acct desc column</td><td align="left">varchar(255)</td><td align="left">Some ASCII NT user data</td></tr><tr><td align="left">identifier:workstations column</td><td align="left">varchar(255)</td><td align="left">Workstations user can logon to (or NULL for all)</td></tr><tr><td align="left">identifier:unknown string column</td><td align="left">varchar(255)</td><td align="left">unknown string</td></tr><tr><td align="left">identifier:munged dial column</td><td align="left">varchar(255)</td><td align="left">?</td></tr><tr><td align="left">identifier:user sid column</td><td align="left">varchar(255)</td><td align="left">NT user SID</td></tr><tr><td align="left">identifier:group sid column</td><td align="left">varchar(255)</td><td align="left">NT group ID</td></tr><tr><td align="left">identifier:lanman pass column</td><td align="left">varchar(255)</td><td align="left">encrypted lanman password</td></tr><tr><td align="left">identifier:nt pass column</td><td align="left">varchar(255)</td><td align="left">encrypted nt passwd</td></tr><tr><td align="left">identifier:plain pass column</td><td align="left">varchar(255)</td><td align="left">plaintext password</td></tr><tr><td align="left">identifier:acct control column</td><td align="left">int(9)</td><td align="left">nt user data</td></tr><tr><td align="left">identifier:unknown 3 column</td><td align="left">int(9)</td><td align="left">unknown</td></tr><tr><td align="left">identifier:logon divs column</td><td align="left">int(9)</td><td align="left">?</td></tr><tr><td align="left">identifier:hours len column</td><td align="left">int(9)</td><td align="left">?</td></tr><tr><td align="left">identifier:unknown 5 column</td><td align="left">int(9)</td><td align="left">unknown</td></tr><tr><td align="left">identifier:unknown 6 column</td><td align="left">int(9)</td><td align="left">unknown</td></tr></tbody></table></div><ns23:p> - </ns23:p><p> - Eventually, you can put a colon (:) after the name of each column, which - should specify the column to update when updating the table. You can also - specify nothing behind the colon - then the data from the field will not be - updated. - </p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2916074"></a>Using plaintext passwords or encrypted password</h4></div></div><div></div></div><p> - I strongly discourage the use of plaintext passwords, however, you can use them: - </p><p> - If you would like to use plaintext passwords, set - 'identifier:lanman pass column' and 'identifier:nt pass column' to - 'NULL' (without the quotes) and 'identifier:plain pass column' to the - name of the column containing the plaintext passwords. - </p><p> - If you use encrypted passwords, set the 'identifier:plain pass - column' to 'NULL' (without the quotes). This is the default. - </p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2916105"></a>Getting non-column data from the table</h4></div></div><div></div></div><p> - It is possible to have not all data in the database and making some 'constant'. - </p><p> - For example, you can set 'identifier:fullname column' to : - <b class="command">CONCAT(First_name,' ',Sur_name)</b> - </p><p> - Or, set 'identifier:workstations column' to : - <b class="command">NULL</b></p><p>See the MySQL documentation for more language constructs.</p></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="XMLpassdb"></a>XML</h3></div></div><div></div></div><p>This module requires libxml2 to be installed.</p><p>The usage of pdb_xml is pretty straightforward. To export data, use: - </p><p> - <tt class="prompt">$ </tt> <b class="userinput"><tt>pdbedit -e xml:filename</tt></b> - </p><p> - (where filename is the name of the file to put the data in) - </p><p> - To import data, use: - <tt class="prompt">$ </tt> <b class="userinput"><tt>pdbedit -i xml:filename</tt></b> - </p></div></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2916213"></a>Common Errors</h2></div></div><div></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2916220"></a>Users can not logon - Users not in Samba SAM</h3></div></div><div></div></div><p> - People forget to put their users in their backend and then complain Samba won't authorize them. - </p></div><div xmlns:ns24="" class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2916235"></a>Users are being added to the wrong backend database</h3></div></div><div></div></div><p> - A few complaints have been received from users that just moved to Samba-3. The following - <tt class="filename">smb.conf</tt> file entries were causing problems, new accounts were being added to the old - smbpasswd file, not to the tdbsam passdb.tdb file: - </p><ns24:p> - </ns24:p><pre class="programlisting"> - [globals] - ... - passdb backend = smbpasswd, tdbsam, guest - ... - </pre><ns24:p> - </ns24:p><p> - Samba will add new accounts to the first entry in the <span class="emphasis"><em>passdb backend</em></span> - parameter entry. If you want to update to the tdbsam, then change the entry to: - </p><ns24:p> - </ns24:p><pre class="programlisting"> - [globals] - ... - passdb backend = tdbsam, smbpasswd, guest - ... - </pre><ns24:p> - </ns24:p></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2916295"></a>auth methods does not work</h3></div></div><div></div></div><p> - If you explicitly set an 'auth methods' parameter, guest must be specified as the first - entry on the line. Eg: <i class="parameter"><tt>auth methods = guest sam</tt></i>. - </p><p> - This is the exact opposite of the requirement for the <i class="parameter"><tt>passdb backed</tt></i> - option, where it must be the <span class="emphasis"><em>LAST</em></span> parameter on the line. - </p></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="NetworkBrowsing.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="optional.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="groupmapping.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 10. Samba / MS Windows Network Browsing Guide </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 12. Mapping MS Windows and Unix Groups</td></tr></table></div></body></html> |