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| author | Jelmer Vernooij <jelmer@samba.org> | 2003-09-23 21:15:41 +0000 |
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| committer | Jelmer Vernooij <jelmer@samba.org> | 2003-09-23 21:15:41 +0000 |
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diff --git a/docs/htmldocs/IntroSMB.html b/docs/htmldocs/IntroSMB.html deleted file mode 100644 index 51a22f14fa..0000000000 --- a/docs/htmldocs/IntroSMB.html +++ /dev/null @@ -1,174 +0,0 @@ -<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter 1. Introduction to Samba</title><link rel="stylesheet" href="samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.60.1"><link rel="home" href="samba-doc.html" title="SAMBA Project Documentation"><link rel="up" href="introduction.html" title="Part I. General Installation"><link rel="previous" href="introduction.html" title="Part I. General Installation"><link rel="next" href="install.html" title="Chapter 2. How to Install and Test SAMBA"></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 1. Introduction to Samba</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="introduction.html">Prev</a> </td><th width="60%" align="center">Part I. General Installation</th><td width="20%" align="right"> <a accesskey="n" href="install.html">Next</a></td></tr></table><hr></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="IntroSMB"></a>Chapter 1. Introduction to Samba</h2></div><div><div class="author"><h3 class="author"><span class="firstname">David</span> <span class="surname">Lechnyr</span></h3><div class="affiliation"><span class="orgname">Unofficial HOWTO<br></span><div class="address"><p><tt class="email"><<a href="mailto:david@lechnyr.com">david@lechnyr.com</a>></tt></p></div></div></div></div><div><p class="pubdate">April 14, 2003</p></div></div><div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><a href="IntroSMB.html#id2817919">Background</a></dt><dt><a href="IntroSMB.html#id2817978">Terminology</a></dt><dt><a href="IntroSMB.html#id2818169">Related Projects</a></dt><dt><a href="IntroSMB.html#id2818237">SMB Methodology</a></dt><dt><a href="IntroSMB.html#id2818345">Epilogue</a></dt><dt><a href="IntroSMB.html#id2818430">Miscellaneous</a></dt></dl></div><p>“<span class="quote"> -"If you understand what you're doing, you're not learning anything." --- Anonymous -</span>”</p><p> -Samba is a file and print server for Windows-based clients using TCP/IP as the underlying -transport protocol. In fact, it can support any SMB/CIFS-enabled client. One of Samba's big -strengths is that you can use it to blend your mix of Windows and Linux machines together -without requiring a separate Windows NT/2000/2003 Server. Samba is actively being developed -by a global team of about 30 active programmers and was originally developed by Andrew Tridgell. -</p><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2817919"></a>Background</h2></div></div><div></div></div><p> -Once long ago, there was a buzzword referred to as DCE/RPC. This stood for Distributed -Computing Environment/Remote Procedure Calls and conceptually was a good idea. It was -originally developed by Apollo/HP as NCA 1.0 (Network Computing Architecture) and only -ran over UDP. When there was a need to run it over TCP so that it would be compatible -with DECnet 3.0, it was redesigned, submitted to The Open Group, and officially became -known as DCE/RPC. Microsoft came along and decided, rather than pay $20 per seat to -license this technology, to reimplement DCE/RPC themselves as MSRPC. From this, the -concept continued in the form of SMB (Server Message Block, or the "what") using the -NetBIOS (Network Basic Input/Output System, or the "how") compatibility layer. You can -run SMB (i.e., transport) over several different protocols; many different implementations -arose as a result, including NBIPX (NetBIOS over IPX, NwLnkNb, or NWNBLink) and NBT -(NetBIOS over TCP/IP, or NetBT). As the years passed, NBT became the most common form -of implementation until the advance of "Direct-Hosted TCP" -- the Microsoft marketing -term for eliminating NetBIOS entirely and running SMB by itself across TCP port 445 -only. As of yet, direct-hosted TCP has yet to catch on. -</p><p> -Perhaps the best summary of the origins of SMB are voiced in the 1997 article titled, CIFS: -Common Insecurities Fail Scrutiny: -</p><p><span class="emphasis"><em> -Several megabytes of NT-security archives, random whitepapers, RFCs, the CIFS spec, the Samba -stuff, a few MS knowledge-base articles, strings extracted from binaries, and packet dumps have -been dutifully waded through during the information-gathering stages of this project, and there -are *still* many missing pieces... While often tedious, at least the way has been generously -littered with occurrences of clapping hand to forehead and muttering 'crikey, what are they -thinking? -</em></span></p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2817978"></a>Terminology</h2></div></div><div></div></div><div class="itemizedlist"><ul type="disc"><li><p> - SMB: Acronym for "Server Message Block". This is Microsoft's file and printer sharing protocol. - </p></li><li><p> - CIFS: Acronym for "Common Internet File System". Around 1996, Microsoft apparently - decided that SMB needed the word "Internet" in it, so they changed it to CIFS. - </p></li><li><p> - Direct-Hosted: A method of providing file/printer sharing services over port 445/tcp - only using DNS for name resolution instead of WINS. - </p></li><li><p> - IPC: Acronym for "Inter-Process Communication". A method to communicate specific - information between programs. - </p></li><li><p> - Marshalling: - A method of serializing (i.e., sequential ordering of) variable data - suitable for transmission via a network connection or storing in a file. The source - data can be re-created using a similar process called unmarshalling. - </p></li><li><p> - NetBIOS: Acronym for "Network Basic Input/Output System". This is not a protocol; - it is a method of communication across an existing protocol. This is a standard which - was originally developed for IBM by Sytek in 1983. To exaggerate the analogy a bit, - it can help to think of this in comparison your computer's BIOS -- it controls the - essential functions of your input/output hardware -- whereas NetBIOS controls the - essential functions of your input/output traffic via the network. Again, this is a bit - of an exaggeration but it should help that paradigm shift. What is important to realize - is that NetBIOS is a transport standard, not a protocol. Unfortunately, even technically - brilliant people tend to interchange NetBIOS with terms like NetBEUI without a second - thought; this will cause no end (and no doubt) of confusion. - </p></li><li><p> - NetBEUI: Acronym for the "NetBIOS Extended User Interface". Unlike NetBIOS, NetBEUI - is a protocol, not a standard. It is also not routable, so traffic on one side of a - router will be unable to communicate with the other side. Understanding NetBEUI is - not essential to deciphering SMB; however it helps to point out that it is not the - same as NetBIOS and to improve your score in trivia at parties. NetBEUI was originally - referred to by Microsoft as "NBF", or "The Windows NT NetBEUI Frame protocol driver". - It is not often heard from these days. - </p></li><li><p> - NBT: Acronym for "NetBIOS over TCP"; also known as "NetBT". Allows the continued use - of NetBIOS traffic proxied over TCP/IP. As a result, NetBIOS names are made - to IP addresses and NetBIOS name types are conceptually equivalent to TCP/IP ports. - This is how file and printer sharing are accomplished in Windows 95/98/ME. They - traditionally rely on three ports: NetBIOS Name Service (nbname) via UDP port 137, - NetBIOS Datagram Service (nbdatagram) via UDP port 138, and NetBIOS Session Service - (nbsession) via TCP port 139. All name resolution is done via WINS, NetBIOS broadcasts, - and DNS. NetBIOS over TCP is documented in RFC 1001 (Concepts and methods) and RFC 1002 - (Detailed specifications). - </p></li><li><p> - W2K: Acronym for Windows 2000 Professional or Server - </p></li><li><p> - W3K: Acronym for Windows 2003 Server - </p></li></ul></div><p>If you plan on getting help, make sure to subscribe to the Samba Mailing List (available at -<a href="http://www.samba.org/" target="_top">http://www.samba.org</a>). -</p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2818169"></a>Related Projects</h2></div></div><div></div></div><p> -There are currently two network filesystem client projects for Linux that are directly -related to Samba: SMBFS and CIFS VFS. These are both available in the Linux kernel itself. -</p><div class="itemizedlist"><ul type="disc"><li><p> - SMBFS (Server Message Block File System) allows you to mount SMB shares (the protocol - that Microsoft Windows and OS/2 Lan Manager use to share files and printers - over local networks) and access them just like any other Unix directory. This is useful - if you just want to mount such filesystems without being a SMBFS server. - </p></li><li><p> - CIFS VFS (Common Internet File System Virtual File System) is the successor to SMBFS, and - is being actively developed for the upcoming version of the Linux kernel. The intent of this module - is to provide advanced network file system functionality including support for dfs (hierarchical - name space), secure per-user session establishment, safe distributed caching (oplock), - optional packet signing, Unicode and other internationalization improvements, and optional - Winbind (nsswitch) integration. - </p></li></ul></div><p> -Again, it's important to note that these are implementations for client filesystems, and have -nothing to do with acting as a file and print server for SMB/CIFS clients. -</p><p> -There are other Open Source CIFS client implementations, such as the -<a href="http://jcifs.samba.org/" target="_top">jCIFS project</a> -which provides an SMB client toolkit written in Java. -</p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2818237"></a>SMB Methodology</h2></div></div><div></div></div><p> -Traditionally, SMB uses UDP port 137 (NetBIOS name service, or netbios-ns), -UDP port 138 (NetBIOS datagram service, or netbios-dgm), and TCP port 139 (NetBIOS -session service, or netbios-ssn). Anyone looking at their network with a good -packet sniffer will be amazed at the amount of traffic generated by just opening -up a single file. In general, SMB sessions are established in the following order: -</p><div class="itemizedlist"><ul type="disc"><li><p> - "TCP Connection" - establish 3-way handshake (connection) to port 139/tcp - or 445/tcp. - </p></li><li><p> - "NetBIOS Session Request" - using the following "Calling Names": The local - machine's NetBIOS name plus the 16th character 0x00; The server's NetBIOS - name plus the 16th character 0x20 - </p></li><li><p> - "SMB Negotiate Protocol" - determine the protocol dialect to use, which will - be one of the following: PC Network Program 1.0 (Core) - share level security - mode only; Microsoft Networks 1.03 (Core Plus) - share level security - mode only; Lanman1.0 (LAN Manager 1.0) - uses Challenge/Response - Authentication; Lanman2.1 (LAN Manager 2.1) - uses Challenge/Response - Authentication; NT LM 0.12 (NT LM 0.12) - uses Challenge/Response - Authentication - </p></li><li><p> - SMB Session Startup. Passwords are encrypted (or not) according to one of - the following methods: Null (no encryption); Cleartext (no encryption); LM - and NTLM; NTLM; NTLMv2 - </p></li><li><p> - SMB Tree Connect: Connect to a share name (e.g., \\servername\share); Connect - to a service type (e.g., IPC$ named pipe) - </p></li></ul></div><p> -A good way to examine this process in depth is to try out -<a href="http://www.securityfriday.com/ToolDownload/SWB/swb_doc.html" target="_top">SecurityFriday's SWB program</a>. -It allows you to walk through the establishment of a SMB/CIFS session step by step. -</p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2818345"></a>Epilogue</h2></div></div><div></div></div><p>“<span class="quote"> -What's fundamentally wrong is that nobody ever had any taste when they -did it. Microsoft has been very much into making the user interface look good, -but internally it's just a complete mess. And even people who program for Microsoft -and who have had years of experience, just don't know how it works internally. -Worse, nobody dares change it. Nobody dares to fix bugs because it's such a -mess that fixing one bug might just break a hundred programs that depend on -that bug. And Microsoft isn't interested in anyone fixing bugs -- they're interested -in making money. They don't have anybody who takes pride in Windows 95 as an -operating system. -</span>”</p><p>“<span class="quote"> -People inside Microsoft know it's a bad operating system and they still -continue obviously working on it because they want to get the next version out -because they want to have all these new features to sell more copies of the -system. -</span>”</p><p>“<span class="quote"> -The problem with that is that over time, when you have this kind of approach, -and because nobody understands it, because nobody REALLY fixes bugs (other than -when they're really obvious), the end result is really messy. You can't trust -it because under certain circumstances it just spontaneously reboots or just -halts in the middle of something that shouldn't be strange. Normally it works -fine and then once in a blue moon for some completely unknown reason, it's dead, -and nobody knows why. Not Microsoft, not the experienced user and certainly -not the completely clueless user who probably sits there shivering thinking -"What did I do wrong?" when they didn't do anything wrong at all. -</span>”</p><p>“<span class="quote"> -That's what's really irritating to me." -</span>”</p><p>-- -<a href="http://hr.uoregon.edu/davidrl/boot.txt" target="_top">Linus Torvalds, from an interview with BOOT Magazine, Sept 1998</a> -</p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2818430"></a>Miscellaneous</h2></div></div><div></div></div><p> -This chapter is Copyright 2003 David Lechnyr (david at lechnyr dot com). -Permission is granted to copy, distribute and/or modify this document under the terms -of the GNU Free Documentation License, Version 1.2 or any later version published by the Free -Software Foundation. A copy of the license is available at http://www.gnu.org/licenses/fdl.txt. -</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="introduction.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="introduction.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="install.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Part I. General Installation </td><td width="20%" align="center"><a accesskey="h" href="samba-doc.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 2. How to Install and Test SAMBA</td></tr></table></div></body></html> |