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authorGerald Carter <jerry@samba.org>2002-01-05 03:53:42 +0000
committerGerald Carter <jerry@samba.org>2002-01-05 03:53:42 +0000
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+<HTML
+><HEAD
+><TITLE
+>Storing Samba's User/Machine Account information in an LDAP Directory</TITLE
+><META
+NAME="GENERATOR"
+CONTENT="Modular DocBook HTML Stylesheet Version 1.57"></HEAD
+><BODY
+CLASS="ARTICLE"
+BGCOLOR="#FFFFFF"
+TEXT="#000000"
+LINK="#0000FF"
+VLINK="#840084"
+ALINK="#0000FF"
+><DIV
+CLASS="ARTICLE"
+><DIV
+CLASS="TITLEPAGE"
+><H1
+CLASS="TITLE"
+><A
+NAME="SAMBA-LDAP-HOWTO"
+>Storing Samba's User/Machine Account information in an LDAP Directory</A
+></H1
+><HR></DIV
+><DIV
+CLASS="SECT1"
+><H1
+CLASS="SECT1"
+><A
+NAME="AEN3"
+>Purpose</A
+></H1
+><P
+>This document describes how to use an LDAP directory for storing Samba user
+account information normally 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
+><P
+></P
+><UL
+><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
+><P
+>Note that <A
+HREF="http://www.ora.com/"
+TARGET="_top"
+>O'Reilly Publishing</A
+> is working on
+a guide to LDAP for System Administrators which has a planned release date of
+early summer, 2002.</P
+><P
+>It may also be helpful to suppplement the reading of the HOWTO with
+the <A
+HREF="http://www.unav.es/cti/ldap-smb/ldap-smb-2_2-howto.html"
+TARGET="_top"
+>Samba-PDC-LDAP-HOWTO</A
+>
+maintained by Ignacio Coupeau.</P
+></DIV
+><DIV
+CLASS="SECT1"
+><HR><H1
+CLASS="SECT1"
+><A
+NAME="AEN17"
+>Introduction</A
+></H1
+><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
+><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 non-optimal. What is needed is an indexed approach such as is used in
+databases.</P
+><P
+>The second problem is that administrators which desired to replicate an
+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 write custom, in-house scripts.</P
+><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
+Identified (RID).</P
+><P
+>As a result of these defeciencies, a more robust means of storing user attributes
+used by smbd was developed. The API which defines access to user accounts
+is referred to as the samdb interface (previously this was called the passdb
+API, and is still so named in the CVS trees). In Samba 2.2.3, enabling support
+for a samdb backend (e.g. <TT
+CLASS="PARAMETER"
+><I
+>--with-ldapsam</I
+></TT
+> or
+<TT
+CLASS="PARAMETER"
+><I
+>--with-tdbsam</I
+></TT
+>) requires compile time support.</P
+><P
+>When compiling Samba to include the <TT
+CLASS="PARAMETER"
+><I
+>--with-ldapsam</I
+></TT
+> autoconf
+option, smbd (and associated tools) will store and lookup user accounts in
+an LDAP directory. In reality, this is very easy to understand. If you are
+comfortable with using an smbpasswd file, simply replace "smbpasswd" with
+"LDAP directory" in all the documentation.</P
+><P
+>There are a few points to stress about what the <TT
+CLASS="PARAMETER"
+><I
+>--with-ldapsam</I
+></TT
+>
+does not provide. The LDAP support referred to in the this documentat does not
+include:</P
+><P
+></P
+><UL
+><LI
+><P
+>A means of retrieving user account information from
+ an Windows 2000 Active Directory server.</P
+></LI
+><LI
+><P
+>A means of replacing /etc/passwd.</P
+></LI
+></UL
+><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
+>). However,
+the details of configuring these packages i beyond the scope of this document.</P
+></DIV
+><DIV
+CLASS="SECT1"
+><HR><H1
+CLASS="SECT1"
+><A
+NAME="AEN42"
+>Supported LDAP Servers</A
+></H1
+><P
+>The LDAP samdb code in 2.2.3 has been developed and tested using the OpenLDAP
+2.0 server and client libraries. The same code should be able to work with
+Netscape's Directory Server and client SDK. However, due to lack of testing
+so far, there are bounds to be compile errors and bugs. These should not be
+hard to fix. If you are so inclined, please be sure to forward all pacthes to
+<A
+HREF="samba-patches@samba.org"
+TARGET="_top"
+>samba-patches@samba.org</A
+> and
+<A
+HREF="jerry@samba.org"
+TARGET="_top"
+>jerry@samba.org</A
+>.</P
+></DIV
+><DIV
+CLASS="SECT1"
+><HR><H1
+CLASS="SECT1"
+><A
+NAME="AEN47"
+>Schema and Relationship to the RFC 2307 posixAccount</A
+></H1
+><P
+>Samba 2.2.3 includes the necessary schema file for OpenLDAP 2.0 in
+<TT
+CLASS="FILENAME"
+>examples/LDAP/samba.schema</TT
+>. (Note that this schema
+file has been modified since the experimental support initially included
+in 2.2.2). The sambaAccount objectclass is given here:</P
+><P
+><PRE
+CLASS="PROGRAMLISTING"
+>objectclass ( 1.3.1.5.1.4.1.7165.2.2.2 NAME 'sambaAccount' SUP top STRUCTURAL
+ DESC 'Samba Account'
+ MUST ( uid $ rid )
+ MAY ( cn $ lmPassword $ ntPassword $ pwdLastSet $ logonTime $
+ logoffTime $ kickoffTime $ pwdCanChange $ pwdMustChange $ acctFlags $
+ displayName $ smbHome $ homeDrive $ scriptPath $ profilePath $
+ description $ userWorkstations $ primaryGroupID ))</PRE
+></P
+><P
+>The samba.schema file has been formatted for OpenLDAP 2.0. The OID's are
+owned by the Samba Team and as such as 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="jerry@samba.org"
+TARGET="_top"
+>jerry@samba.org</A
+></P
+><P
+>Just as the smbpasswd file is mean to store information which supplements a
+user's <TT
+CLASS="FILENAME"
+>/etc/passwd</TT
+> entry, so is the sambaAccount object
+meant to supplement the UNIX user account information. A sambaAccount 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 sambaAccount 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 mkes it posible 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 infratrsucture.</P
+><P
+>To include support for the sambaAccount object in an OpenLDAP directory
+server, first copy the samba.schema file to slapd's configuration directory.</P
+><P
+><TT
+CLASS="PROMPT"
+>root# </TT
+><B
+CLASS="COMMAND"
+>cp samba.schema /etc/openldap/schema/</B
+></P
+><P
+>Next, include the <TT
+CLASS="FILENAME"
+>samba.schema</TT
+> file in <TT
+CLASS="FILENAME"
+>slapd.conf</TT
+>.
+The sambaAccount 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. Bother of these must be included before the <TT
+CLASS="FILENAME"
+>samba.schema</TT
+> file.</P
+><P
+><PRE
+CLASS="PROGRAMLISTING"
+>## /etc/openldap/slapd.conf
+
+## schema files (core.schema is required by default)
+include /etc/openldap/schema/core.schema
+
+## needed for sambaAccount
+include /etc/openldap/schema/cosine.schema
+include /etc/openldap/schema/inetorgperson.schema
+include /etc/openldap/schema/samba.schema
+
+## uncomment this line if you want to support the RFC2307 (NIS) schema
+## include /etc/openldap/schema/nis.schema
+
+....</PRE
+></P
+></DIV
+><DIV
+CLASS="SECT1"
+><HR><H1
+CLASS="SECT1"
+><A
+NAME="AEN71"
+>smb.conf LDAP parameters</A
+></H1
+><P
+>The following parameters are available in smb.conf only with <TT
+CLASS="PARAMETER"
+><I
+>--with-ldapsam</I
+></TT
+>
+was included with compiling Samba.</P
+><P
+></P
+><UL
+><LI
+><P
+><A
+HREF="smb.conf.5.html#LDAPSSL"
+TARGET="_top"
+>ldap ssl</A
+></P
+></LI
+><LI
+><P
+><A
+HREF="smb.conf.5.html#LDAPSERVER"
+TARGET="_top"
+>ldap server</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#LDAPPORT"
+TARGET="_top"
+>ldap port</A
+></P
+></LI
+></UL
+><P
+>These are described in the <A
+HREF="smb.conf.5.html"
+TARGET="_top"
+>smb.conf(5)</A
+> 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
+><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 <TT
+CLASS="REPLACEABLE"
+><I
+>secretpw</I
+></TT
+>' to store the
+ # passphrase in the secrets.tdb file. If the "ldap admin dn" values
+ # changes, this password will need to be reset.
+ ldap admin dn = "cn=Manager,dc=samba,dc=org"
+
+ # specify the LDAP server's hostname (defaults to locahost)
+ ldap server = ahab.samba.org
+
+ # Define the SSL option when connecting to the directory
+ # ('off', 'start tls', or 'on' (default))
+ ldap ssl = start tls
+
+ # define the port to use in the LDAP session (defaults to 636 when
+ # "ldap ssl = on")
+ ldap port = 389
+
+ # 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 = "(&#38;(uid=%u)(objectclass=sambaAccount))"</PRE
+></P
+></DIV
+><DIV
+CLASS="SECT1"
+><HR><H1
+CLASS="SECT1"
+><A
+NAME="AEN99"
+>Security and sambaAccount</A
+></H1
+><P
+>There are two important points to remember when discussing the security
+of sambaAccount entries in the directory.</P
+><P
+></P
+><UL
+><LI
+><P
+><I
+CLASS="EMPHASIS"
+>Never</I
+> retrieve the lmPassword or
+ ntPassword attribute values over and unencrypted LDAP session.</P
+></LI
+><LI
+><P
+><I
+CLASS="EMPHASIS"
+>Never</I
+> allow non-admin users to
+ view the lmPassword or ntPassword attribute values.</P
+></LI
+></UL
+><P
+>These password hashes are clear text equivalents and can be used to impersonate
+the user without deriving the original clear text strings.</P
+><P
+>To remedy the first security issue, the "ldap ssl" smb.conf parameter defaults
+to require an encrypted session (<B
+CLASS="COMMAND"
+>ldap ssl = on</B
+>) using
+the default port of 636
+when contacting the directory server. When using an OpenLDAP 2.0 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
+(<B
+CLASS="COMMAND"
+>ldap ssl = off</B
+>).</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
+><P
+><PRE
+CLASS="PROGRAMLISTING"
+>## allow users to update their own password, but not to browse others
+access to attrs=userPassword,lmPassword,ntPassword
+ by self write
+ by * auth</PRE
+></P
+><P
+>You may of course, add in write access to administrative DN's as necessary.</P
+></DIV
+><DIV
+CLASS="SECT1"
+><HR><H1
+CLASS="SECT1"
+><A
+NAME="AEN118"
+></A
+></H1
+><P
+>There are currently four sambaAccount attributes which map directly onto
+<TT
+CLASS="FILENAME"
+>smb.conf</TT
+> parameters.</P
+><P
+></P
+><UL
+><LI
+><P
+>smbHome -&gt; "logon home"</P
+></LI
+><LI
+><P
+>profilePath -&gt; "logon path"</P
+></LI
+><LI
+><P
+>homeDrive -&gt; "logon drive"</P
+></LI
+><LI
+><P
+>scriptPath -&gt; "logon script"</P
+></LI
+></UL
+><P
+>First of all, these parameters are only used when Samba is acting as a
+PDC or a domain (refer to the <A
+HREF="Samba-PDC-HOWTO.html"
+TARGET="_top"
+>Samba-PDC-HOWTO</A
+>
+for details on how to configure Samba as a Primary Domain Controller).
+Furthermore, these attributes are only stored with the sambaAccount entry if
+the values are non-default values. For example, assume TASHTEGO has now been
+configured as a PDC and that <B
+CLASS="COMMAND"
+>logon home = \\%L\%u</B
+> was defined in
+its <TT
+CLASS="FILENAME"
+>smb.conf</TT
+> file. Assuming <TT
+CLASS="FILENAME"
+>smb.conf</TT
+>
+also contains , when a user named "becky" logons to the domain, the <TT
+CLASS="PARAMETER"
+><I
+>logon
+home</I
+></TT
+> string is expanded to \\TASHTEGO\becky.</P
+><P
+>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 <TT
+CLASS="PARAMETER"
+><I
+>logon home</I
+></TT
+> parameter is used in its place. Samba
+will only write the attribute value to the directory entry is the value is
+something other than the default (e.g. \\MOBY\becky).</P
+></DIV
+><DIV
+CLASS="SECT1"
+><HR><H1
+CLASS="SECT1"
+><A
+NAME="AEN139"
+>Example LDIF Entries for a sambaAccount</A
+></H1
+><P
+>The following is a working LDIF with the inclusion of the posixAccount objectclass:</P
+><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: sambaAccount
+uid: guest2
+kickoffTime: 2147483647
+acctFlags: [UX ]
+logoffTime: 2147483647
+rid: 19006
+pwdCanChange: 0</PRE
+></P
+><P
+>The following is an LDIF entry for using both the sambaAccount and
+posixAccount objectclasses:</P
+><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: sambaAccount
+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
+></P
+></DIV
+><DIV
+CLASS="SECT1"
+><HR><H1
+CLASS="SECT1"
+><A
+NAME="AEN147"
+>Comments</A
+></H1
+><P
+>Please mail all comments regarding this HOWTO to <A
+HREF="mailto:jerry@samba.org"
+TARGET="_top"
+>jerry@samba.org</A
+>. This documents was
+last updated to reflect the Samba 2.2.3 release.&#13;</P
+></DIV
+></DIV
+></BODY
+></HTML
+> \ No newline at end of file