The Official Samba-4 HOWTOab/output/Samba4-HOWTO.pdfThe Official Samba-4 HOWTO Jelmer R. Vernooij...
Transcript of The Official Samba-4 HOWTOab/output/Samba4-HOWTO.pdfThe Official Samba-4 HOWTO Jelmer R. Vernooij...
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The Official Samba-4 HOWTO
Jelmer R. Vernooij
22nd April 2008
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ATTRIBUTION
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ATTRIBUTION
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CONTENTS
Contents
ATTRIBUTION v
ATTRIBUTION vi
Part I Introduction to SMB networks ix
Chapter 1 THE SMB/CIFS PROTOCOL xii1.1 History xii
1.1.1 Invention by IBM xii1.1.2 The various incarnations of SMB xiii
1.1.2.1 DOS xiii1.1.2.2 Windows For Workgroups xiv1.1.2.3 Windows NT xiv1.1.2.4 Windows 2000 xiv
1.1.3 Samba versions and their support for the SMB models xv1.1.3.1 Samba 2.2 xv1.1.3.2 Samba 3.0 xv1.1.3.3 Samba 3.2 xv1.1.3.4 Samba 4.0 xv
Chapter 2 SAMBA xvi2.1 Samba 2.2 xvi2.2 Samba 3.0 xvi2.3 Samba 3.2 xvi2.4 Samba 4.0 xvi
Part II Samba 4 Basics xv
Chapter 3 CONFIGURATION xviii
Chapter 4 CHAPTER xix
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viii Contents
Part III Network model xix
Part IV Network Model: Share-based security xxi
Chapter 5 SHARE-BASED STAND-ALONE SERVER xxiii
Part V Network Model: User-based security xxiii
Chapter 6 USER-BASED STAND-ALONE SERVER xxv
Part VI Network Model: NT4-style domains xxv
Chapter 7 CHAPTER xxvii
Chapter 8 BACKUP DOMAIN CONTROLLER xxviii
Chapter 9 CHAPTER xxix
Part VII Network Model - Active Directory xxix
Chapter 10 ACTIVE DIRECTORY - DOMAIN CONTROLLERxxxi
Chapter 11 ACTIVE DIRECTORY - MEMBER xxxii
Part VIII Common services xxxi
Chapter 12 CHAPTER xxxiv
Chapter 13 PRINTING xxxv13.1 Unix printing types xxxv
Chapter 14 AUTHENTICATION xxxvi
Chapter 15 REGISTRY xxxvii
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Contents ix
Part IX Clients xxxvii
Chapter 16 SMBCLIENT xl
Chapter 17 CIFSFS xli
Chapter 18 CHAPTER xlii
Part X Appendices xli
Chapter 19 COMPILING xliii19.1 Downloading the source - Tar Ball xliii19.2 Downloading the source - Subversion xliii19.3 Compiling the source xliii19.4 Installing xliii
LIST OF FIGURES xliv
LIST OF TABLES xlv
SUBJECT INDEX xlvii
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Part I
Introduction to SMBnetworks
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Contents xi
Not everybody is already familiar with SMB networks and the jargon used insuch networks. This part describes the evolution of SMB, how the protocolis structured and what Samba can be used for.
NT admins, already familiar with SMB networks, are probably only inter-ested in the chapter about Samba itself.
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Chapter 1
THE SMB/CIFS PROTOCOL
”SMB” (also known as ”CIFS”) is a file-sharing protocol that has been usedsince the mid-eighties. Most people know SMB as the protocol behind the”Network Neighbourhood” and remote printing in Windows.
Several parts of the protocol are not discussed in this chapter, such as mail-slots, browsing and dfs, to prevent it from getting too complex. CIFS inter-nals are documented in detail in [?], [?].
1.1 History
1.1.1 Invention by IBM
SMB is not very old, but it has a long history of modifications and exten-sions. The original protocol was meant to run over “NetBIOS”, which wasthe name of the DOS interface to a very simple LAN system developed byIBM. NetBIOS was developed because SNA, IBM’s other main protocol atthe time, was much too advanced for use in DOS.
The NetBIOS API in these days (early eighties) was nothing more then theinterface to a very simple link-layer protocol over which several protocols,including SMB, were used. It could do reads and writes to services onremote hosts, which were identified by case-insensitive names, and discoverall available hosts and services.
Dr. Barry Feigenbau, an IBM employee, invented the core of the originalSMB protocol, which he initially named after himself: “BAF”. He laterchanged the name to be “SMB” (for “Server Message Block”). Every packetin the protocol starts with a byte $0xFF$ and these three letters.
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Section 1.1. History xiii
IBM, Microsoft, 3Com and Intel made up the rest of the initial protocoltogether. The commands the protocol supported at this stage were basicallya mirror of the DOS File IO API calls, which meant the protocol wasn’t veryefficient. The protocol also lacked authentication support. Everybody onthe network could do reads and writes, which meant this protocol wasn’tvery suitable for large enterprises.
NetBIOS is an API that has had various implementations; there is NetBIOSover TCP/IP (NBT), NetBIOS over IPX, NetBIOS over SNA and evenNetBIOS over DECNEt. Mostly used these days is NetBIOS over TCP(NBT).
This is also were things are starting to get hairy. Since NetBIOS identi-fies hosts by their name, NetBIOS clients had to start doing IP broadcaststo figure out the IP of the host they had to connect to. Several schemeswere introduced to do name lookups crossing subnet boundaries, using nameservers, etc. We’re basically emulating a NetBIOS LAN in order to be ableto run SMB.
Doing NetBIOS over IP is not very sane, however, the NBT implementationitself in Windows isn’t very nice either. It has horrible limits, special ex-ceptions, several broken schemes for looking up names (including two kindsof name servers). NetBIOS and NetBIOS over TCP/IP are described inRFC1001 and RFC1002.
1.1.2 The various incarnations of SMB
Over the years, several usage models for SMB have been developed. WhileSMB originally started out as a file sharing protocol, it was later extendedto include support for network management and other network services aswell.
One of the reasons for the various ”upgrades” of the SMB protocol is thefact that networks have become larger and larger and with them the needfor privilege separation and scalability has increased.
1.1.2.1 DOS
The original model in which SMB was used was as a simple file-sharingservice in a NetBIOS-environment.
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xiv The SMB/CIFS protocol Chapter 1
File sharing worked basically by specifying a list of directories that had to beshared and what name they had to be shared under (”shares”). Eventually,one could password-protect a share. At most one password per share couldbe set.
1.1.2.2 Windows For Workgroups
After the “CORE” dialect, IBM and Microsoft implemented a new dialectknown as “LANMAN”. This dialect was used by Windows for Workgroups,OS/2 and Windows 9x which all know it under a different name. A ’virtual’file system was also added, which was used for doing remote function calls(RAP, for “Remote Administration Protocol”).
Computers are grouped into ”Workgroups” in this model. Everybody isequal to the others and there is no central point of control.
1.1.2.3 Windows NT
For Windows NT, yet another dialect was added, named ’NT’. The NTdialect had it’s own set of file I/O functions (similar to the NT File I/OAPI) and it had support for yet another way of doing remote function calls:DCE/RPC. RPC’s are used for DCOM and several of the subsystems in NTthat can be accessed remotely (registry, printing, user management, loggingon, etc).
Windows NT works with a new concept for grouping computers called “do-mains”1. Each computer is member of exactly one domain. There are severalroles a computer can have in the domain: PDC (primary domain controller,the ”manager” of the domain, that coordinates all authentication and au-thorization), BDC (Backup domain controller, in case the PDC goes down)or just a regular domain member. The PDC decides who is to be a memberof the domain.
1.1.2.4 Windows 2000
In Windows NT 5 (marketing name: Windows 2000), NetBIOS-less SMBwas introduced. This means SMB is used directly over TCP port 445 insteadof via NetBIOS over TCP/IP. DNS is used for looking up machine names.
1In the protocol, domains are actually an upgraded version of a workgroup
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Section 1.1. History xv
Windows 2000 was also the first operating system from Microsoft that hadsupport for Active Directory. Active Directory is very similar to the ”do-main” concept used by NT4, though it is implemented differently (usingmodified open protocols), and has some additional features (one of the mostimportant ones being decentralized).
Active directory no longer uses a central point of authority and there arefewer limits to the size of a domain. Several DC’s can exist, so there is nolonger a single point of failure as well as better scalability.
1.1.3 Samba versions and their support for the SMB models
1.1.3.1 Samba 2.2
Full CORE and Workgroup support. Somewhat basic NT4-style support.
1.1.3.2 Samba 3.0
Full CORE and Workgroup support. Almost complete NT4-style support.
1.1.3.3 Samba 3.2
FIXME
1.1.3.4 Samba 4.0
Full CORE, Workgroup, NT4 and ADS support.
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Chapter 2
SAMBA
Samba is an Open Source application that provides an SMB implementationfor POSIX-compatible operating systems.
Providing support for a Windows-based file-sharing protocol on POSIXservers sometimes requires mapping Windows semantics to POSIX seman-tics.
Samba has always been catching up with Microsoft. Here is a list of Sambareleases and what they support (or will support).
2.1 Samba 2.2
Full CORE and Workgroup support. Somewhat basic NT4-style support.
2.2 Samba 3.0
Full CORE and Workgroup support. Almost complete NT4-style support.
2.3 Samba 3.2
FIXME
2.4 Samba 4.0
Full CORE, Workgroup, NT4 and ADS support.
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Part II
Samba 4 Basics
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Section 2.4. Samba 4.0 xvii
FIXME
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Chapter 3
CONFIGURATION
Chapter describing Samba’s configuration in detail.
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Chapter 4
CHAPTER
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Part III
Network model
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A SMB server is used in a certain network type (workgroup, domain, ac-tive directory) with a specific role (stand-alone, primary domain controller,backup domain controller, etc) in that network. Samba has to be configuredaccording to that role. Each of the chapters in this part describes how toconfigure Samba for a specific role.
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Part IV
Network Model: Share-basedsecurity
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Chapter 5
SHARE-BASEDSTAND-ALONE SERVER
One of the simplest
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Part V
Network Model: User-basedsecurity
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Chapter 6
USER-BASED STAND-ALONESERVER
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Part VI
Network Model: NT4-styledomains
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Chapter 7
CHAPTER
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Chapter 8
BACKUP DOMAINCONTROLLER
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Chapter 9
CHAPTER
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Part VII
Network Model - ActiveDirectory
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Chapter 10
ACTIVE DIRECTORY -DOMAIN CONTROLLER
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Chapter 11
ACTIVE DIRECTORY -MEMBER
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Part VIII
Common services
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Independent of the role the server has, it can provide services. Examples ofservices are printing, user management, authentication, etc.
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Chapter 12
CHAPTER
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Chapter 13
PRINTING
13.1 Unix printing types
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Chapter 14
AUTHENTICATION
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Chapter 15
REGISTRY
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Part IX
Clients
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Samba includes a number of different clients for accessing SMB file, print andother services. Pretty much every service can be access using a command-line utility, though there are several GUI clients available as well.
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Chapter 16
SMBCLIENT
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Chapter 17
CIFSFS
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Chapter 18
CHAPTER
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Part X
Appendices
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Chapter 19
COMPILING
19.1 Downloading the source - Tar Ball
19.2 Downloading the source - Subversion
19.3 Compiling the source
19.4 Installing
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List of Figures
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List of Tables
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SUBJECT INDEX
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