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authorGerald Carter <jerry@samba.org>2003-10-10 16:46:22 +0000
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-<chapter id="InterdomainTrusts">
-<chapterinfo>
- &author.jht;
- &author.mimir;
- <author>&person.jelmer;<contrib>drawing</contrib></author>
- <author>
- <firstname>Stephen</firstname><surname>Langasek</surname>
- <affiliation>
- <address><email>vorlon@netexpress.net</email></address>
- </affiliation>
- </author>
- <pubdate>April 3, 2003</pubdate>
-</chapterinfo>
-
-<title>Interdomain Trust Relationships</title>
-
-
-<para>
-<indexterm><primary>Interdomain Trusts</primary></indexterm>
-Samba-3 supports NT4-style domain trust relationships. This is a feature that many sites
-will want to use if they migrate to Samba-3 from an NT4-style domain and do not want to
-adopt Active Directory or an LDAP-based authentication backend. This section explains
-some background information regarding trust relationships and how to create them. It is now
-possible for Samba-3 to trust NT4 (and vice versa), as well as to create Samba-to-Samba
-trusts.
-</para>
-
-<sect1>
-<title>Features and Benefits</title>
-
-<para>
-Samba-3 can participate in Samba-to-Samba as well as in Samba-to-MS Windows NT4-style
-trust relationships. This imparts to Samba similar scalability as with MS Windows NT4.
-</para>
-
-<para>
-Given that Samba-3 has the capability to function with a scalable backend authentication
-database such as LDAP, and given its ability to run in Primary as well as Backup Domain Control
-modes, the administrator would be well advised to consider alternatives to the use of
-Interdomain trusts simply because by the very nature of how this works it is fragile.
-That was, after all, a key reason for the development and adoption of Microsoft Active Directory.
-</para>
-
-</sect1>
-
-<sect1>
-<title>Trust Relationship Background</title>
-
-<para>
-MS Windows NT3/4 type security domains employ a non-hierarchical security structure.
-The limitations of this architecture as it effects the scalability of MS Windows networking
-in large organizations is well known. Additionally, the flat namespace that results from
-this design significantly impacts the delegation of administrative responsibilities in
-large and diverse organizations.
-</para>
-
-<para>
-Microsoft developed Active Directory Service (ADS), based on Kerberos and LDAP, as a means
-of circumventing the limitations of the older technologies. Not every organization is ready
-or willing to embrace ADS. For small companies the older NT4-style domain security paradigm
-is quite adequate, there remains an entrenched user base for whom there is no direct
-desire to go through a disruptive change to adopt ADS.
-</para>
-
-<para>
-With MS Windows NT, Microsoft introduced the ability to allow differing security domains
-to effect a mechanism so users from one domain may be given access rights and privileges
-in another domain. The language that describes this capability is couched in terms of
-<emphasis>Trusts</emphasis>. Specifically, one domain will <emphasis>trust</emphasis> the users
-from another domain. The domain from which users are available to another security domain is
-said to be a trusted domain. The domain in which those users have assigned rights and privileges
-is the trusting domain. With NT3.x/4.0 all trust relationships are always in one direction only,
-thus if users in both domains are to have privileges and rights in each others' domain, then it is
-necessary to establish two relationships, one in each direction.
-</para>
-
-<para>
-In an NT4-style MS security domain, all trusts are non-transitive. This means that if there
-are three domains (let's call them RED, WHITE and BLUE) where RED and WHITE have a trust
-relationship, and WHITE and BLUE have a trust relationship, then it holds that there is no
-implied trust between the RED and BLUE domains. Relationships are explicit and not
-transitive.
-</para>
-
-<para>
-New to MS Windows 2000 ADS security contexts is the fact that trust relationships are two-way
-by default. Also, all inter-ADS domain trusts are transitive. In the case of the RED, WHITE and BLUE
-domains above, with Windows 2000 and ADS the RED and BLUE domains can trust each other. This is
-an inherent feature of ADS domains. Samba-3 implements MS Windows NT4-style Interdomain trusts
-and interoperates with MS Windows 200x ADS security domains in similar manner to MS Windows NT4-style domains.
-</para>
-
-</sect1>
-
-<sect1>
-<title>Native MS Windows NT4 Trusts Configuration</title>
-
-<para>
-There are two steps to creating an interdomain trust relationship. To effect a two-way trust
-relationship, it is necessary for each domain administrator to create a trust account for the
-other domain to use in verifying security credentials.
-<indexterm><primary>Interdomain Trusts</primary><secondary>creating</secondary></indexterm>
-</para>
-
-
-<sect2>
-<title>Creating an NT4 Domain Trust</title>
-
-<para>
-For MS Windows NT4, all domain trust relationships are configured using the
-<application>Domain User Manager</application>. This is done from the Domain User Manager Policies
-entry on the menu bar. From the <guimenu>Policy</guimenu> menu, select
-<guimenuitem>Trust Relationships</guimenuitem>. Next to the lower box labeled
-<guilabel>Permitted to Trust this Domain</guilabel> are two buttons, <guibutton>Add</guibutton>
-and <guibutton>Remove</guibutton>. The <guibutton>Add</guibutton> button will open a panel in which
-to enter the name of the remote domain that will be able to assign access rights to users in
-your domain. You will also need to enter a password for this trust relationship, which the
-trusting domain will use when authenticating users from the trusted domain.
-The password needs to be typed twice (for standard confirmation).
-</para>
-
-</sect2>
-
-
-<sect2>
-<title>Completing an NT4 Domain Trust</title>
-
-<para>
-<indexterm><primary>Interdomain Trusts</primary><secondary>Completing</secondary></indexterm>
-A trust relationship will work only when the other (trusting) domain makes the appropriate connections
-with the trusted domain. To consummate the trust relationship, the administrator will launch the
-Domain User Manager from the menu select <guilabel>Policies</guilabel>, then select
-<guilabel>Trust Relationships</guilabel>, click on the <guibutton>Add</guibutton> button
-next to the box that is labeled <guilabel>Trusted Domains</guilabel>. A panel will open in which
-must be entered the name of the remote domain as well as the password assigned to that trust.
-</para>
-
-</sect2>
-
-<sect2>
-<title>Inter-Domain Trust Facilities</title>
-
-
-<para>
-<indexterm><primary>Interdomain Trusts</primary><secondary>Facilities</secondary></indexterm>
-A two-way trust relationship is created when two one-way trusts are created, one in each direction.
-Where a one-way trust has been established between two MS Windows NT4 domains (let's call them
-DomA and DomB), the following facilities are created:
-</para>
-
-<image id="trusts1"><imagefile>trusts1</imagefile><imagedescription>Trusts overview.</imagedescription></image>
-
-<itemizedlist>
- <listitem><para>
- DomA (completes the trust connection) <parameter>Trusts</parameter> DomB.
- </para></listitem>
-
- <listitem><para>
- DomA is the <parameter>Trusting</parameter> domain.
- </para></listitem>
-
- <listitem><para>
- DomB is the <parameter>Trusted</parameter> domain (originates the trust account).
- </para></listitem>
-
- <listitem><para>
- Users in DomB can access resources in DomA.
- </para></listitem>
-
- <listitem><para>
- Users in DomA cannot access resources in DomB.
- </para></listitem>
-
- <listitem><para>
- Global groups from DomB can be used in DomA.
- </para></listitem>
-
- <listitem><para>
- Global groups from DomA cannot be used in DomB.
- </para></listitem>
-
- <listitem><para>
- DomB does appear in the logon dialog box on client workstations in DomA.
- </para></listitem>
-
- <listitem><para>
- DomA does not appear in the logon dialog box on client workstations in DomB.
- </para></listitem>
-</itemizedlist>
-
-<itemizedlist>
- <listitem><para>
- Users/Groups in a trusting domain cannot be granted rights, permissions or access
- to a trusted domain.
- </para></listitem>
-
- <listitem><para>
- The trusting domain can access and use accounts (Users/Global Groups) in the
- trusted domain.
- </para></listitem>
-
- <listitem><para>
- Administrators of the trusted domain can be granted admininstrative rights in the
- trusting domain.
- </para></listitem>
-
- <listitem><para>
- Users in a trusted domain can be given rights and privileges in the trusting
- domain.
- </para></listitem>
-
- <listitem><para>
- Trusted domain Global Groups can be given rights and permissions in the trusting
- domain.
- </para></listitem>
-
- <listitem><para>
- Global Groups from the trusted domain can be made members in Local Groups on
- MS Windows Domain Member machines.
- </para></listitem>
-</itemizedlist>
-
-</sect2>
-
-</sect1>
-
-<sect1>
-<title>Configuring Samba NT-Style Domain Trusts</title>
-
-<para>
-This description is meant to be a fairly short introduction about how to set up a Samba server so
-that it can participate in interdomain trust relationships. Trust relationship support in Samba
-is at an early stage, so do not be surprised if something does not function as it should.
-</para>
-
-<para>
-Each of the procedures described below assumes the peer domain in the trust relationship is
-controlled by a Windows NT4 server. However, the remote end could just as well be another
-Samba-3 domain. It can be clearly seen, after reading this document, that combining
-Samba-specific parts of what's written below leads to trust between domains in a purely Samba
-environment.
-</para>
-
-<sect2 id="samba-trusted-domain">
-<title>Samba as the Trusted Domain</title>
-
-<para>
-In order to set the Samba PDC to be the trusted party of the relationship, you first need
-to create a special account for the domain that will be the trusting party. To do that,
-you can use the <command>smbpasswd</command> utility. Creating the trusted domain account is
-similar to creating a trusted machine account. Suppose, your domain is
-called SAMBA, and the remote domain is called RUMBA. The first step
-will be to issue this command from your favorite shell:
-</para>
-
-<para>
-<screen>
-&rootprompt; <userinput>smbpasswd -a -i rumba</userinput>
-New SMB password: <userinput>XXXXXXXX</userinput>
-Retype SMB password: <userinput>XXXXXXXX</userinput>
-Added user rumba$
-</screen>
-
-where <option>-a</option> means to add a new account into the
-passdb database and <option>-i</option> means: <quote>create this
-account with the InterDomain trust flag</quote>.
-</para>
-
-<para>
-The account name will be <quote>rumba$</quote> (the name of the remote domain).
-</para>
-
-<para>
-After issuing this command, you will be asked to enter the password for
-the account. You can use any password you want, but be aware that Windows NT will
-not change this password until seven days following account creation.
-After the command returns successfully, you can look at the entry for the new account
-(in the standard way as appropriate for your configuration) and see that account's name is
-really RUMBA$ and it has the <quote>I</quote> flag set in the flags field. Now you are ready to confirm
-the trust by establishing it from Windows NT Server.
-</para>
-
-
-<para>
-<indexterm><primary>User Manager</primary></indexterm>
-Open <application>User Manager for Domains</application> and from the
-<guimenu>Policies</guimenu> menu, select <guimenuitem>Trust Relationships...</guimenuitem>.
-Beside the <guilabel>Trusted domains</guilabel> list box click the
-<guimenu>Add...</guimenu> button. You will be prompted for
-the trusted domain name and the relationship password. Type in SAMBA, as this is
-the name of the remote domain and the password used at the time of account creation.
-Click on <guibutton>OK</guibutton> and, if everything went without incident, you will see
-the <computeroutput>Trusted domain relationship successfully
-established</computeroutput> message.
-</para>
-
-</sect2>
-<sect2>
-<title>Samba as the Trusting Domain</title>
-
-<para>
-This time activities are somewhat reversed. Again, we'll assume that your domain
-controlled by the Samba PDC is called SAMBA and the NT-controlled domain is called RUMBA.
-</para>
-
-<para>
-The very first step is to add an account for the SAMBA domain on RUMBA's PDC.
-</para>
-
-
-<para>
-<indexterm><primary>User Manager</primary></indexterm>
-Launch the <application>Domain User Manager</application>, then from the menu select
-<guimenu>Policies</guimenu>, <guimenuitem>Trust Relationships</guimenuitem>.
-Now, next to the <guilabel>Trusted Domains</guilabel> box press the <guibutton>Add</guibutton>
-button and type in the name of the trusted domain (SAMBA) and the password to use in securing
-the relationship.
-</para>
-
-<para>
-The password can be arbitrarily chosen. It is easy to change the password
-from the Samba server whenever you want. After confirming the password your account is
-ready for use. Now its Samba's turn.
-</para>
-
-<para>
-Using your favorite shell while being logged in as root, issue this command:
-</para>
-
-<para>
-&rootprompt;<userinput>net rpc trustdom establish rumba</userinput>
-</para>
-
-<para>
-You will be prompted for the password you just typed on your Windows NT4 Server box.
-An error message <errorname>`NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT'</errorname>
-that may be reported periodically is of no concern and may safely be ignored.
-It means the password you gave is correct and the NT4 Server says the account is ready for
-interdomain connection and not for ordinary connection. After that, be patient;
-it can take a while (especially in large networks), but eventually you should see
-the <computeroutput>Success</computeroutput> message. Congratulations! Your trust
-relationship has just been established.
-</para>
-
-<note><para>
-You have to run this command as root because you must have write access to
-the <filename>secrets.tdb</filename> file.
-</para></note>
-
-</sect2>
-</sect1>
-
-<sect1>
-<title>NT4-Style Domain Trusts with Windows 2000</title>
-<para>
-Although <application>Domain User Manager</application> is not present in Windows 2000, it is
-also possible to establish an NT4-style trust relationship with a Windows 2000 domain
-controller running in mixed mode as the trusting server. It should also be possible for
-Samba to trust a Windows 2000 server, however, more testing is still needed in this area.
-</para>
-
-<para>
-After <link linkend="samba-trusted-domain">creating the interdomain trust account on the
-Samba server</link> as described above, open <application>Active Directory Domains and
-Trusts</application> on the AD controller of the domain whose resources you wish Samba users
-to have access to. Remember that since NT4-style trusts are not transitive, if you want
-your users to have access to multiple mixed-mode domains in your AD forest, you will need to
-repeat this process for each of those domains. With <application>Active Directory Domains
-and Trusts</application> open, right-click on the name of the Active Directory domain that
-will trust our Samba domain and choose <guimenuitem>Properties</guimenuitem>, then click on
-the <guilabel>Trusts</guilabel> tab. In the upper part of the panel, you will see a list box
-labeled <guilabel>Domains trusted by this domain:</guilabel>, and an
-<guilabel>Add...</guilabel> button next to it. Press this button and just as with NT4, you
-will be prompted for the trusted domain name and the relationship password. Press OK and
-after a moment, Active Directory will respond with <computeroutput>The trusted domain has
-been added and the trust has been verified.</computeroutput> Your Samba users can now be
-granted acess to resources in the AD domain.
-</para>
-</sect1>
-
-<sect1>
-<title>Common Errors</title>
-
-<para>
-Interdomain trust relationships should not be attempted on networks that are unstable
-or that suffer regular outages. Network stability and integrity are key concerns with
-distributed trusted domains.
-</para>
-
-</sect1>
-
-</chapter>