path: root/docs/manpages-3/ntlm_auth.1.xml

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<!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
<refentry id="ntlm-auth.1">

<refmeta>
	<refentrytitle>ntlm_auth</refentrytitle>
	<manvolnum>1</manvolnum>
</refmeta>


<refnamediv>
	<refname>ntlm_auth</refname>
	<refpurpose>tool to allow external access to Winbind's NTLM authentication function</refpurpose>
</refnamediv>

<refsynopsisdiv>
	<cmdsynopsis>
		<command>ntlm_auth</command>
		<arg choice="opt">-d debuglevel</arg>
		<arg choice="opt">-l logdir</arg>
		<arg choice="opt">-s &lt;smb config file&gt;</arg>
	</cmdsynopsis>
</refsynopsisdiv>

<refsect1>
	<title>DESCRIPTION</title>

	<para>This tool is part of the <citerefentry><refentrytitle>samba</refentrytitle>
	<manvolnum>7</manvolnum></citerefentry> suite.</para>

	<para><command>ntlm_auth</command> is a helper utility that authenticates 
	users using NT/LM authentication. It returns 0 if the users is authenticated
	successfully and 1 if access was denied. ntlm_auth uses winbind to access 
	the user and authentication data for a domain.  This utility 
	is only indended to be used by other programs (currently
	<ulink url="http://www.squid-cache.org/">Squid</ulink>
	and <ulink url="http://download.samba.org/ftp/unpacked/lorikeet/trunk/mod_ntlm_winbind/">mod_ntlm_winbind</ulink>)
	</para>
</refsect1>

<refsect1>
	<title>OPERATIONAL REQUIREMENTS</title>

    <para>
    The <citerefentry><refentrytitle>winbindd</refentrytitle>
    <manvolnum>8</manvolnum></citerefentry> daemon must be operational
    for many of these commands to function.</para>

    <para>Some of these commands also require access to the directory 
    <filename>winbindd_privileged</filename> in
    <filename>$LOCKDIR</filename>.  This should be done either by running
    this command as root or providing group access
    to the <filename>winbindd_privileged</filename> directory.  For
    security reasons, this directory should not be world-accessable. </para>

</refsect1>


<refsect1>
	<title>OPTIONS</title>

	<variablelist>
	<varlistentry>
	<term>--helper-protocol=PROTO</term>
	<listitem><para>
	Operate as a stdio-based helper.  Valid helper protocols are:
        </para> 
        <variablelist>
	      <varlistentry>
		<term>squid-2.4-basic</term>
		<listitem><para>
                Server-side helper for use with Squid 2.4's basic (plaintext)
		authentication.  </para>
                </listitem>
		</varlistentry>
	      <varlistentry>
		<term>squid-2.5-basic</term>
		<listitem><para>
                Server-side helper for use with Squid 2.5's basic (plaintext)
		authentication. </para>
                </listitem>
		</varlistentry>
	      <varlistentry>
		<term>squid-2.5-ntlmssp</term>
		<listitem><para>
                Server-side helper for use with Squid 2.5's NTLMSSP 
		authentication. </para>
		  <para>Requires access to the directory 
                <filename>winbindd_privileged</filename> in
		<filename>$LOCKDIR</filename>.  The protocol used is
		described here: <ulink
		url="http://devel.squid-cache.org/ntlm/squid_helper_protocol.html">http://devel.squid-cache.org/ntlm/squid_helper_protocol.html</ulink>.
		This protocol has been extended to allow the
		NTLMSSP Negotiate packet to be included as an argument
		to the <command>YR</command> command. (Thus avoiding
		loss of information in the protocol exchange).
                </para>
                </listitem>
	      </varlistentry>
	      <varlistentry>
		<term>ntlmssp-client-1</term>
		<listitem><para>
                Client-side helper for use with arbitary external
		programs that may wish to use Samba's NTLMSSP 
		authentication knowlege. </para>
		  <para>This helper is a client, and as such may be run by any
		user.  The protocol used is
		effectivly the reverse of the previous protocol.  A
		<command>YR</command> command (without any arguments)
		starts the authentication exchange.
                </para>
                </listitem>
	      </varlistentry>

	      <varlistentry>
		<term>gss-spnego</term>
		<listitem><para>
                Server-side helper that implements GSS-SPNEGO.  This
		uses a protocol that is almost the same as
		<command>squid-2.5-ntlmssp</command>, but has some
		subtle differences that are undocumented outside the
		source at this stage.
                </para>
		  <para>Requires access to the directory 
                <filename>winbindd_privileged</filename> in
		<filename>$LOCKDIR</filename>.   
               </para>
                </listitem>
		</varlistentry>
                 
	        <varlistentry>
				<term>gss-spnego-client</term>
		<listitem><para>
                Client-side helper that implements GSS-SPNEGO.  This
		also uses a protocol similar to the above helpers, but
		is currently undocumented.
                </para>
                </listitem>
		</varlistentry>

	        <varlistentry>
				<term>ntlm-server-1</term>
		<listitem><para>
                Server-side helper protocol, intended for use by a
		RADIUS server or the 'winbind' plugin for pppd, for
		the provision of MSCHAP and MSCHAPv2 authentication.  
                </para>
		<para>This protocol consists of lines in for form:
                <command>Parameter: value</command> and <command>Paramter::
                Base64-encode value</command>.  The presence of a single
                period <command>.</command> indicates that one side has
                finished supplying data to the other.  (Which in turn
                could cause the helper to authenticate the
                user). </para>

		<para>Curently implemented parameters from the
		external program to the helper are:</para>
		<variablelist>
		  <varlistentry>
		  <term>Username</term>
		  
                <listitem><para>The username, expected to be in
                Samba's <smbconfoption name="unix charset"/>.
                </para>

		      <para><example>Username: bob</example></para>
		      <para><example>Username:: Ym9i</example></para>
		    </listitem></varlistentry>

		  <varlistentry>
		  <term>Username</term>
                <listitem><para>The user's domain, expected to be in
                Samba's <smbconfoption name="unix charset"/>.
                </para>

		      <para><example>Domain: WORKGROUP</example></para>
		      <para><example>Domain:: V09SS0dST1VQ</example></para>
		    </listitem></varlistentry>

		  <varlistentry>
		  <term>Full-Username</term>
                <listitem><para>The fully qualified username, expected to be in
                Samba's <smbconfoption><name>unix
                charset</name></smbconfoption> and qualified with the
                <smbconfoption name="winbind separator"/>.
                </para>

		      <para><example>Full-Username: WORKGROUP\bob</example></para>
		      <para><example>Full-Username:: V09SS0dST1VQYm9i</example></para>
		    </listitem></varlistentry>

		  <varlistentry>
		  <term>LANMAN-Challenge</term>
		  
                <listitem><para>The 8 byte <command>LANMAN Challenge</command> value,
                generated randomly by the server, or (in cases such as
                MSCHAPv2) generated in some way by both the server and
                the client.
                </para>	
		      <para><example>LANMAN-Challege: 0102030405060708</example></para>
		    </listitem></varlistentry>

		  <varlistentry>
		  <term>LANMAN-Response</term>
		  
                <listitem><para>The 24 byte <command>LANMAN Response</command> value,
                calculated from the user's password and the supplied
                <command>LANMAN Challenge</command>.  Typically, this
                is provided over the network by a client wishing to authenticate.
                </para>	
		      <para><example>LANMAN-Response: 0102030405060708090A0B0C0D0E0F101112131415161718</example></para>

		    </listitem></varlistentry>

		  <varlistentry>
		  <term>NT-Response</term>
                <listitem><para>The >= 24 byte <command>NT Response</command>
                calculated from the user's password and the supplied
                <command>LANMAN Challenge</command>.  Typically, this is 
                provided over the network by a client wishing to authenticate.
                 </para>	
		      <para><example>NT-Response: 0102030405060708090A0B0C0D0E0F101112131415161718</example></para>

		    </listitem></varlistentry>

		  <varlistentry>
		  <term>Password</term>
                <listitem><para>The user's password.  This would be
                provided by a network client, if the helper is being
                used in a legacy situation that exposes plaintext
                passwords in this way.
                 </para>	
		      <para><example>Password: samba2</example></para>
		      <para><example>Password:: c2FtYmEy</example></para>

		    </listitem></varlistentry>

		  <varlistentry>
		  <term>Request-User-Session-Key</term>
                <listitem><para>Apon sucessful authenticaiton, return
                the user session key associated with the login.
                 </para>	
		      <para><example>Request-User-Session-Key: Yes</example></para>

		    </listitem></varlistentry>

		  <varlistentry>
		  <term>Request-LanMan-Session-Key</term>
                <listitem><para>Apon sucessful authenticaiton, return
                the LANMAN session key associated with the login.
                 </para>	
		      <para><example>Request-LanMan-Session-Key: Yes</example></para>

		    </listitem></varlistentry>

		<para><warning>Implementors should take care to base64 encode
		any data (such as usernames/passwords) that may contain malicous user data, such as
		a newline.  They may also need to decode strings from
		the helper, which likewise may have been base64 encoded.</warning></para>
	</variablelist>

                </listitem>
		</varlistentry>
	</variablelist>
	</listitem>
      </varlistentry>
      
      <varlistentry>
	<term>--username=USERNAME</term>
	<listitem><para>
	Specify username of user to authenticate
	</para></listitem>
	
      </varlistentry>
      
      <varlistentry>
	<term>--domain=DOMAIN</term>
	<listitem><para>
	Specify domain of user to authenticate
	</para></listitem>
      </varlistentry>

      <varlistentry>
	<term>--workstation=WORKSTATION</term>
	<listitem><para>
	Specify the workstation the user authenticated from
	</para></listitem>
      </varlistentry>

	<varlistentry>
	<term>--challenge=STRING</term>
	<listitem><para>NTLM challenge (in HEXADECIMAL)</para>
	</listitem>
	</varlistentry>

	<varlistentry>
	<term>--lm-response=RESPONSE</term>
	<listitem><para>LM Response to the challenge (in HEXADECIMAL)</para></listitem>
	</varlistentry>

	<varlistentry>
	<term>--nt-response=RESPONSE</term>
	<listitem><para>NT or NTLMv2 Response to the challenge (in HEXADECIMAL)</para></listitem>
	</varlistentry>

	<varlistentry>
	<term>--password=PASSWORD</term>
	<listitem><para>User's plaintext password</para><para>If 
	not specified on the command line, this is prompted for when
	required.  </para>

	  <para>For the NTLMSSP based server roles, this paramter
	  specifies the expected password, allowing testing without
	  winbindd operational.</para>
	</listitem>
	</varlistentry>

	<varlistentry>
	<term>--request-lm-key</term>
	<listitem><para>Retreive LM session key</para></listitem>
	</varlistentry>

	<varlistentry>
	<term>--request-nt-key</term>
	<listitem><para>Request NT key</para></listitem>
	</varlistentry>

      <varlistentry>
	<term>--diagnostics</term>
	<listitem><para>Perform Diagnostics on the authentication
	chain.  Uses the password from <command>--password</command>
	or prompts for one.</para>
        </listitem>
        </varlistentry>
	
	<varlistentry>
	    <term>--require-membership-of={SID|Name}</term>
	    <listitem><para>Require that a user be a member of specified 
	    group (either name or SID) for authentication to succeed.</para>
	    </listitem>
	</varlistentry>

	  &popt.common.samba;
	  &stdarg.help;
	
	</variablelist>
</refsect1>

<refsect1>
	<title>EXAMPLE SETUP</title>

        <para>To setup ntlm_auth for use by squid 2.5, with both basic and
	NTLMSSP authentication, the following
	should be placed in the <filename>squid.conf</filename> file.
<programlisting>
auth_param ntlm program ntlm_auth --helper-protocol=squid-2.5-ntlmssp
auth_param basic program ntlm_auth --helper-protocol=squid-2.5-basic
auth_param basic children 5
auth_param basic realm Squid proxy-caching web server
auth_param basic credentialsttl 2 hours
</programlisting></para>

<note><para>This example assumes that ntlm_auth has been installed into your
      path, and that the group permissions on
      <filename>winbindd_privileged</filename> are as described above.</para></note>

	<para>To setup ntlm_auth for use by squid 2.5 with group limitation in addition to the above
	example, the following should be added to the <filename>squid.conf</filename> file.
<programlisting>
auth_param ntlm program ntlm_auth --helper-protocol=squid-2.5-ntlmssp --require-membership-of='WORKGROUP\Domain Users'
auth_param basic program ntlm_auth --helper-protocol=squid-2.5-basic --require-membership-of='WORKGROUP\Domain Users'
</programlisting></para>
	
</refsect1>

<refsect1>
	<title>TROUBLESHOOTING</title>
	
	<para>If you're experiencing problems with authenticating Internet Explorer running
	under MS Windows 9X or Millenium Edition against ntlm_auth's NTLMSSP authentication
	helper (--helper-protocol=squid-2.5-ntlmssp), then please read 
	<ulink url="http://support.microsoft.com/support/kb/articles/Q239/8/69.ASP">
	the Microsoft Knowledge Base article #239869 and follow instructions described there</ulink>.
	</para>
</refsect1>

<refsect1>
	<title>VERSION</title>

	<para>This man page is correct for version 3.0 of the Samba 
	suite.</para>
</refsect1>

<refsect1>
	<title>AUTHOR</title>
	
	<para>The original Samba software and related utilities 
	were created by Andrew Tridgell. Samba is now developed
	by the Samba Team as an Open Source project similar 
	to the way the Linux kernel is developed.</para>
	
	<para>The ntlm_auth manpage was written by Jelmer Vernooij and
	Andrew Bartlett.</para>
</refsect1>

</refentry>