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libfreetds0-doc-0.82-12.mga1.i586.rpm

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><A
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>Domain Logins</A
></H1
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>Domain logins can be used only with TDS protocol versions 7.0 and 8.0.</P
></TD
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><P
>As mentioned in the installation chapter, <SPAN
CLASS="PRODUCTNAME"
>Microsoft SQL Server</SPAN
> includes the ability to use domain logins instead of standard server logins.  The advantage of doing this is that the passwords are encrypted on the wire using a challenge-response protocol.
<SPAN
CLASS="PRODUCTNAME"
>FreeTDS</SPAN
> began supporting domain logins in version 0.60.
			</P
><P
>To use domain logins, use the <TT
CLASS="LITERAL"
>'DOMAIN\username'</TT
> syntax for the username and use the domain password.  
			</P
><DIV
CLASS="EXAMPLE"
><A
NAME="E.G.DOMAINLOGIN"
></A
><P
><B
>Example 5-4. Logging in with a domain login</B
></P
><PRE
CLASS="SCREEN"
><SAMP
CLASS="COMPUTEROUTPUT"
>$ </SAMP
><KBD
CLASS="USERINPUT"
>tsql -S camelot -U 'NOTTINGHAM\lancelot' -P roundtable</KBD
>
locale is "C"
locale charset is "646"
Msg 5703, Level 0, State 1, Server CPRO200, Line 0
Changed language setting to middle_english.
1&#62; </PRE
></DIV
><P
>When <SPAN
CLASS="PRODUCTNAME"
>FreeTDS</SPAN
> sees the <SPAN
CLASS="QUOTE"
>"<TT
CLASS="LITERAL"
>\</TT
>"</SPAN
> character, it automatically chooses a domain login.
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>The term <I
CLASS="FIRSTTERM"
>domain</I
> in this context is a Microsoft term.  It refers to what's sometimes called an <I
CLASS="FIRSTTERM"
>NT domain</I
>.  It's unrelated to the DNS domain.  DNS domains are used for name resolution.  NT domains are used for authentication.  Authentication is done by the domain controller, often the <I
CLASS="FIRSTTERM"
>Primary Domain Controller</I
> (PDC).  
  			</P
><P
>The SQL Server machine may belong to an NT domain.  <SPAN
CLASS="PRODUCTNAME"
>FreeTDS</SPAN
> provides an encrypted password &mdash; a domain password, known to the domain controller &mdash; that the server will ask the domain controller to verify.  </P
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><H2
CLASS="SECT2"
><A
NAME="DOMAINDETAILS"
>Implementation details</A
></H2
><P
>Support for domain logins in <SPAN
CLASS="PRODUCTNAME"
>FreeTDS</SPAN
> is limited to the TCP/IP network protocol stack.   <SPAN
CLASS="PRODUCTNAME"
>FreeTDS</SPAN
> does not currently implement support for Named Pipe-based SQL connections &mdash; that is, connections transported over the DCE/RPC interface, which uses TCP port 139, 445, or 135 on Win32 machines depending on the type of encapsulation used for DCE/RPC itself. Supporting this would require a fairly extensive DCE/RPC library for Unix.   <SPAN
CLASS="PRODUCTNAME"
>Samba</SPAN
> has one that is licensed under the GPL and therefore not usable by LGPL-licensed projects such as <SPAN
CLASS="PRODUCTNAME"
>FreeTDS</SPAN
> . 
			</P
><P
>Your domain controller must allow authentication over TCP/IP, or you will be unable to log in.  One symptom of a server that requires Named Pipes for authentication is an error message such as:
			</P
><P
><DIV
CLASS="INFORMALEXAMPLE"
><P
></P
><A
NAME="AEN1948"
></A
><PRE
CLASS="SCREEN"
><SAMP
CLASS="COMPUTEROUTPUT"
>Login failed for user '(null)'. 
Reason: Not associated with a trusted SQL Server connection.</SAMP
></PRE
><P
></P
></DIV
>
			</P
><P
>The telltale sign being <TT
CLASS="LITERAL"
>user '(null)'</TT
>.  
			</P
><P
>If you suspect a problem along these lines, you could ask your friendly system administrator to check the following setting:

<PRE
CLASS="PROGRAMLISTING"
>Computer Configuration
 	\Windows Settings
		\Security Settings
			\Local Policies
				\Security Options
					\LAN Manager Authentication Level</PRE
>
The setting should be <SPAN
CLASS="QUOTE"
>"<TT
CLASS="LITERAL"
>Send LM &#38; NTLM responses</TT
>"</SPAN
>.  
  			</P
><P
>For a technical description of the protocol used for domain logins, see 
<A
HREF="http://davenport.sourceforge.net/ntlm.html"
TARGET="_top"
>http://davenport.sourceforge.net/ntlm.html</A
></P
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