%xinclude; %global_entities; ]> material domain joining Information presented here is considered to be either basic or well-known material that is informative yet helpful. Over the years, I have observed an interesting behavior. There is an expectation that the process for joining a Windows client to a Samba-controlled Windows Domain may somehow involve steps different from doing so with Windows NT4 or a Windows ADS Domain. Be assured that the steps are identical, as shown in the example given below. joining a domain Microsoft Windows NT/200x/XP Professional platforms can participate in Domain Security. This section steps through the process for making a Windows 200x/XP Professional machine a member of a Domain Security environment. It should be noted that this process is identical when joining a domain that is controlled by Windows NT4/200x as well as a Samba PDC. Click Start. Right-click My Computer, and then select Properties. The opening panel is the same one that can be reached by clicking System on the Control Panel. See . wxpp001The General Panel. Click the Computer Name tab. This panel shows the Computer Description, the Full computer name, and the Workgroup or Domain name. Clicking the Network ID button launches the configuration wizard. Do not use this with Samba-3. If you wish to change the computer name, or join or leave the domain, click the Change button. See . wxpp004The Computer Name Panel. Click on Change. This panel shows that our example machine (TEMPTATION) is in a workgroup called WORKGROUP. We join the domain called MIDEARTH. See . wxpp006The Computer Name Changes Panel. Enter the name MIDEARTH in the field below the Domain radio button. This panel shows that our example machine (TEMPTATION) is set to join the domain called MIDEARTH. See . wxpp007The Computer Name Changes Panel &smbmdash; Domain MIDEARTH. Now click the OK button. A dialog box should appear to allow you to provide the credentials (username and password) of a Domain administrative account that has the rights to add machines to the Domain. Enter the name root and the root password from your Samba-3 server. See . wxpp008Computer Name Changes &smbmdash; User name and Password Panel. Click OK. The Welcome to the MIDEARTH domain dialog box should appear. At this point, the machine must be rebooted. Joining the domain is now complete. Active Directory DNS The screen capture shown in has a button labeled More.... This button opens a panel in which you can set (or change) the Primary DNS suffix of the computer. This is a parameter that mainly affects members of Microsoft Active Directory. Active Directory is heavily oriented around the DNS name space. Netlogon DNSdynamic Where NetBIOS technology uses WINS as well as UDP broadcast as key mechanisms for name resolution, Active Directory servers register their services with the Microsoft Dynamic DNS server. Windows clients must be able to query the correct DNS server to find the services (like which machines are Domain Controllers or which machines have the Netlogon service running). DNS suffix The default setting of the Primary DNS suffix is the Active Directory domain name. When you change the Primary DNS suffix, this does not affect Domain Membership, but it can break network browsing and the ability to resolve your computer name to a valid IP address. The Primary DNS suffix parameter principally affects MS Windows clients that are members of an Active Directory domain. Where the client is a member of a Samba Domain, it is preferable to leave this field blank. Group Policy According to Microsoft documentation, If this computer belongs to a group with Group Policy enabled on Primary DNS suffice of this computer, the string specified in the Group Policy is used as the primary DNS suffix and you might need to restart your computer to view the correct setting. The local setting is used only if Group Policy is disabled or unspecified. default installation /usr/local/samba /usr/local One of the frustrations expressed by subscribers to the Samba mailing lists revolves around the choice of where the default Samba Team build and installation process locates its Samba files. The location, chosen in the early 1990s, for the default installation is in the /usr/local/samba directory. This is a perfectly reasonable location, particularly given all the other Open Source software that installs into the /usr/local subdirectories. Several UNIX vendors, and Linux vendors in particular, elected to locate the Samba files in a location other than the Samba Team default. Free Standards Grou FSG FSG Linux Standards Base LSB LSB File Hierarchy System FHS FHS file locations /etc/samba /usr/sbin /usr/bin /usr/share /usr/share/swat /usr/lib/samba /usr/share/samba/swat SWAT VFS modules Linux vendors, working in conjunction with the Free Standards Group (FSG), Linux Standards Base (LSB), and File Hierarchy System (FHS), have elected to locate the configuration files under the /etc/samba directory, common binary files (those used by users) in the /usr/bin directory, and the administrative files (daemons) in the /usr/sbin directory. Support files for the Samba Web Admin Tool (SWAT) are located under the /usr/share directory, either in /usr/share/samba/swat or in /usr/share/swat. There are additional support files for smbd in the /usr/lib/samba directory tree. The files located there include the dynamically loadable modules for the passdb backend as well as for the VFS modules. /var/lib/samba /var/log/samba run-time control files Samba creates run-time control files and generates log files. The run-time control files (tdb and dat files) are stored in the /var/lib/samba directory. Log files are created in /var/log/samba. When Samba is built and installed using the default Samba Team process, all files are located under the /usr/local/samba directory tree. This makes it simple to find the files that Samba owns. smbd location of files One way to find the Samba files that are installed on your UNIX/Linux system is to search for the location of all files called smbd. Here is an example: &rootprompt; find / -name smbd -print You can find the location of the configuration files by running: &rootprompt; /path-to-binary-file/smbd -b | more ... Paths: SBINDIR: /usr/sbin BINDIR: /usr/bin SWATDIR: /usr/share/samba/swat CONFIGFILE: /etc/samba/smb.conf LOGFILEBASE: /var/log/samba LMHOSTSFILE: /etc/samba/lmhosts LIBDIR: /usr/lib/samba SHLIBEXT: so LOCKDIR: /var/lib/samba PIDDIR: /var/run/samba SMB_PASSWD_FILE: /etc/samba/smbpasswd PRIVATE_DIR: /etc/samba ... If you wish to locate the Samba version, just run: &rootprompt; /path-to-binary-file/smbd -V Version 3.0.2-SUSE Many people have been caught by installation of Samba using the default Samba Team process when it was already installed by the platform vendor's method. If your platform uses RPM format packages, you can check to see if Samba is installed by executing: rpm &rootprompt; rpm -qa | grep samba samba3-pdb-3.0.2-1 samba3-vscan-0.3.4-0 samba3-winbind-3.0.2-1 samba3-3.0.2-1 samba3-python-3.0.2-1 samba3-utils-3.0.2-1 samba3-doc-3.0.2-1 samba3-client-3.0.2-1 samba3-cifsmount-3.0.2-1 package names The package names, of course, vary according to how the vendor, or the binary package builder, prepared them. daemon Samba essentially consists of two or three daemons. A daemon is a UNIX application that runs in the background and provides services. An example of a service is the Apache Web server for which the daemon is called httpd. In the case of Samba, there are three daemons, two of which are needed as a minimum. The Samba server is made up of the following daemons: #!/bin/bash # # Script to start/stop samba # Locate this in /sbin as a file called 'samba' RCD=/etc/rc.d if [ z$1 == 'z' ]; then echo $0 - No arguments given; must be start or stop. exit fi if [ $1 == 'start' ]; then ${RCD}/nmb start ${RCD}/smb start ${RCD}/winbind start fi if [ $1 == 'stop' ]; then ${RCD}/smb stop ${RCD}/winbind stop ${RCD}/nmb stop fi if [ $1 == 'restart' ]; then ${RCD}/smb stop ${RCD}/winbind stop ${RCD}/nmb stop sleep 5 ${RCD}/nmb start ${RCD}/smb start ${RCD}/winbind start fi exit 0 nmbd smbd starting sambasmbd This daemon handles all name registration and resolution requests. It is the primary vehicle involved in network browsing. It handles all UDP-based protocols. The nmbd daemon should be the first command started as part of the Samba startup process. smbd nmbd starting sambanmbd This daemon handles all TCP/IP-based connection services for file- and print-based operations. It also manages local authentication. It should be started immediately following the startup of nmbd. winbindd winbindd starting sambawinbindd This daemon should be started when Samba is a member of a Windows NT4 or ADS Domain. IT is also needed when Samba has trust relationships with another Domain. The winbindd daemon will check the &smb.conf; file for the presence of the idmap uid and idmap gid parameters. If they are not found, winbindd bails out and refuses to start. When Samba has been packaged by an operating system vendor, the startup process is typically a custom feature of its integration into the platform as a whole. Please refer to your operating system platform administration manuals for specific information pertaining to correct management of Samba startup. #!/bin/sh # # chkconfig: 345 81 35 # description: Starts and stops the Samba smbd and nmbd daemons \ # used to provide SMB network services. # Source function library. . /etc/rc.d/init.d/functions # Source networking configuration. . /etc/sysconfig/network # Check that networking is up. [ ${NETWORKING} = "no" ] && exit 0 CONFIG=/etc/samba/smb.conf # Check that smb.conf exists. [ -f $CONFIG ] || exit 0 # See how we were called. case "$1" in start) echo -n "Starting SMB services: " daemon smbd -D; daemon nmbd -D; echo; touch /var/lock/subsys/smb ;; stop) echo -n "Shutting down SMB services: " smbdpids=`ps guax | grep smbd | grep -v grep | awk '{print $2}'` for pid in $smbdpids; do kill -TERM $pid done killproc nmbd -TERM; rm -f /var/lock/subsys/smb echo "" ;; status) status smbd; status nmbd; ;; restart) echo -n "Restarting SMB services: " $0 stop; $0 start; echo "done." ;; *) echo "Usage: smb {start|stop|restart|status}" exit 1 esac samba control script SUSE Linux implements individual control over each Samba daemon. A samba control script that can be conveniently executed from the command line is shown in . This can be located in the directory /sbin in a file called samba. This type of control script should be owned by user root and group root, and set so that only root can execute it. startup script A sample startup script for a Red Hat Linux system is shown in . This file could be located in the directory /etc/rc.d and can be called samba. A similar startup script is required to control winbind. If you want to find more information regarding startup scripts please refer to the packaging section of the Samba source code distribution tarball. The packaging files for each platform include a startup control file. The following files are common to all DNS server configurations. Rather than repeat them multiple times, they are presented here for general reference. The forward zone file for the loopback address never changes. An example file is shown in . All traffic destined for an IP address that is hosted on a physical interface on the machine itself is routed to the loopback adaptor. This is a fundamental design feature of the TCP/IP protocol implementation. The loopback adaptor is called localhost. $TTL 1W @ IN SOA @ root ( 42 ; serial 2D ; refresh 4H ; retry 6W ; expiry 1W ) ; minimum IN NS @ IN A 127.0.0.1 The reverse zone file for the loopback address as shown in is necessary so that references to the address 127.0.0.1 can be resolved to the correct name of the interface. $TTL 1W @ IN SOA localhost. root.localhost. ( 42 ; serial 2D ; refresh 4H ; retry 6W ; expiry 1W ) ; minimum IN NS localhost. 1 IN PTR localhost. ; This file is made available by InterNIC under anonymous FTP as ; file /domain/named.root ; on server FTP.INTERNIC.NET ; last update: Nov 5, 2002. Related version of root zone: 2002110501 ; formerly NS.INTERNIC.NET . 3600000 IN NS A.ROOT-SERVERS.NET. A.ROOT-SERVERS.NET. 3600000 A 198.41.0.4 ; formerly NS1.ISI.EDU . 3600000 NS B.ROOT-SERVERS.NET. B.ROOT-SERVERS.NET. 3600000 A 128.9.0.107 ; formerly C.PSI.NET . 3600000 NS C.ROOT-SERVERS.NET. C.ROOT-SERVERS.NET. 3600000 A 192.33.4.12 ; formerly TERP.UMD.EDU . 3600000 NS D.ROOT-SERVERS.NET. D.ROOT-SERVERS.NET. 3600000 A 128.8.10.90 ; formerly NS.NASA.GOV . 3600000 NS E.ROOT-SERVERS.NET. E.ROOT-SERVERS.NET. 3600000 A 192.203.230.10 ; formerly NS.ISC.ORG . 3600000 NS F.ROOT-SERVERS.NET. F.ROOT-SERVERS.NET. 3600000 A 192.5.5.241 ; formerly NS.NIC.DDN.MIL . 3600000 NS G.ROOT-SERVERS.NET. G.ROOT-SERVERS.NET. 3600000 A 192.112.36.4 ; formerly AOS.ARL.ARMY.MIL . 3600000 NS H.ROOT-SERVERS.NET. H.ROOT-SERVERS.NET. 3600000 A 128.63.2.53 ; formerly NIC.NORDU.NET . 3600000 NS I.ROOT-SERVERS.NET. I.ROOT-SERVERS.NET. 3600000 A 192.36.148.17 ; operated by VeriSign, Inc. . 3600000 NS J.ROOT-SERVERS.NET. J.ROOT-SERVERS.NET. 3600000 A 192.58.128.30 ; housed in LINX, operated by RIPE NCC . 3600000 NS K.ROOT-SERVERS.NET. K.ROOT-SERVERS.NET. 3600000 A 193.0.14.129 ; operated by IANA . 3600000 NS L.ROOT-SERVERS.NET. L.ROOT-SERVERS.NET. 3600000 A 198.32.64.12 ; housed in Japan, operated by WIDE . 3600000 NS M.ROOT-SERVERS.NET. M.ROOT-SERVERS.NET. 3600000 A 202.12.27.33 ; End of File The content of the root hints file as shown in changes slowly over time. Periodically this file should be updated from the source shown. Because of its size this file is located at the end of this appendix. LDAP database LDAP initial configuration The following procedure may be used as an alternative means of configuring the initial LDAP database. Many administrators prefer to have greater control over how system files get configured. LDIF Domain Groups well-known SID The first step to get the LDAP server ready for action is to create the LDIF file from which the LDAP database will be preloaded. This is necessary to create the containers into which the user, group, and so on, accounts is written. It is also necessary to preload the well-known Windows NT Domain Groups, as they must have the correct SID so that they can be recognized as special NT Groups by the MS Windows clients. Create a directory in which to store the files you use to generate the LDAP LDIF file for your system. Execute the following: &rootprompt; mkdir /etc/openldap/SambaInit &rootprompt; chown root.root /etc/openldap/SambaInit &rootprompt; chmod 700 /etc/openldap/SambaInit Install the files shown in , , and into the directory /etc/openldap/SambaInit/SMBLDAP-ldif-preconfig.sh. These three files are, respectively, Part A, B, and C of the SMBLDAP-ldif-preconfig.sh file. Install the files shown in and into the directory /etc/openldap/SambaInit/nit-ldif.pat. These two files are Part A and B, respectively, of the init-ldif.pat file. Change to the /etc/openldap/SambaInit directory. Execute the following: &rootprompt; ./SMBLDAP-ldif-preconfig.sh How do you wish to refer to your organization? Suggestions: Black Tire Company, Inc. Cat With Hat Ltd. How would you like your organization name to appear? Your organization name is: My Organization Enter a new name is this is not what you want, press Enter to Continue. Name [My Organization]: Abmas Inc. Samba Config File Location [/etc/samba/smb.conf]: Enter a new full path or press Enter to continue. Samba Config File Location [/etc/samba/smb.conf]: Domain Name: MEGANET2 Domain SID: S-1-5-21-3504140859-1010554828-2431957765 The name of your Internet domain is now needed in a special format as follows, if your domain name is mydomain.org, what we need is the information in the form of: Domain ID: mydomain Top level: org If your fully qualified hostname is: snoopy.bazaar.garagesale.net where "snoopy" is the name of the machine, Then the information needed is: Domain ID: garagesale Top Level: net Found the following domain name: abmas.biz I think the bit we are looking for might be: abmas Enter the domain name or press Enter to continue: The top level organization name I will use is: biz Enter the top level org name or press Enter to continue: &rootprompt; This creates a file called MEGANET2.ldif. It is now time to preload the LDAP database with the following command: &rootprompt; slapadd -v -l MEGANET2.ldif added: "dc=abmas,dc=biz" (00000001) added: "cn=Manager,dc=abmas,dc=biz" (00000002) added: "ou=People,dc=abmas,dc=biz" (00000003) added: "ou=Computers,dc=abmas,dc=biz" (00000004) added: "ou=Groups,dc=abmas,dc=biz" (00000005) added: "ou=Domains,dc=abmas,dc=biz" (00000006) added: "sambaDomainName=MEGANET2,ou=Domains,dc=abmas,dc=biz" (00000007) added: "cn=domadmins,ou=Groups,dc=abmas,dc=biz" (00000008) added: "cn=domguests,ou=Groups,dc=abmas,dc=biz" (00000009) added: "cn=domusers,ou=Groups,dc=abmas,dc=biz" (0000000a) You should verify that the account information was correctly loaded by executing: &rootprompt; slapcat dn: dc=abmas,dc=biz objectClass: dcObject objectClass: organization dc: abmas o: Abmas Inc. description: Posix and Samba LDAP Identity Database structuralObjectClass: organization entryUUID: af552f8e-c4a1-1027-9002-9421e01bf474 creatorsName: cn=manager,dc=abmas,dc=biz modifiersName: cn=manager,dc=abmas,dc=biz createTimestamp: 20031217055747Z modifyTimestamp: 20031217055747Z entryCSN: 2003121705:57:47Z#0x0001#0#0000 ... dn: cn=domusers,ou=Groups,dc=abmas,dc=biz objectClass: posixGroup objectClass: sambaGroupMapping gidNumber: 513 cn: domusers sambaSID: S-1-5-21-3504140859-1010554828-2431957765-513 sambaGroupType: 2 displayName: Domain Users description: Domain Users structuralObjectClass: posixGroup entryUUID: af7e98ba-c4a1-1027-900b-9421e01bf474 creatorsName: cn=manager,dc=abmas,dc=biz modifiersName: cn=manager,dc=abmas,dc=biz createTimestamp: 20031217055747Z modifyTimestamp: 20031217055747Z entryCSN: 2003121705:57:47Z#0x000a#0#0000 Your LDAP database is ready for testing. You can now start the LDAP server using the system tool for your Linux operating system. For SUSE Linux, you can do this as follows: &rootprompt; rcldap start It is now a good idea to validate that the LDAP server is running correctly. Execute the following: &rootprompt; ldapsearch -x -b "dc=abmas,dc=biz" "(ObjectClass=*)" # extended LDIF # # LDAPv3 # base <dc=abmas,dc=biz> with scope sub # filter: (ObjectClass=*) # requesting: ALL # # abmas.biz dn: dc=abmas,dc=biz objectClass: dcObject objectClass: organization dc: abmas o: Abmas Inc. description: Posix and Samba LDAP Identity Database ... # domusers, Groups, abmas.biz dn: cn=domusers,ou=Groups,dc=abmas,dc=biz objectClass: posixGroup objectClass: sambaGroupMapping gidNumber: 513 cn: domusers sambaSID: S-1-5-21-3504140859-1010554828-2431957765-513 sambaGroupType: 2 displayName: Domain Users description: Domain Users # search result search: 2 result: 0 Success # numResponses: 11 # numEntries: 10 Your LDAP server is ready for creation of additional accounts. #!/bin/bash # # This script prepares the ldif LDAP load file only # # Pattern File Name file=init-ldif.pat # The name of my organization ORGNAME="My Organization" # My Internet domain. ie: if my domain is: buckets.org, INETDOMAIN="buckets" INETDOMAIN="my-domain" # In the above case, md domain is: buckets.org, TLDORG="org" TLDORG="org" # This is the Samba Domain/Workgroup Name DOMNAME="MYWORKGROUP" # # Here We Go ... # cat >>EOF How do you wish to refer to your organization? Suggestions: Black Tire Company, Inc. Cat With Hat Ltd. How would you like your organization name to appear? EOF echo "Your organization name is: $ORGNAME" echo echo "Enter a new name or, press Enter to Continue." echo echo -e -n "Name [$ORGNAME]: " read name if [ ! -z "$name" ]; then ORGNAME=${name} fi echo sed "s/ORGNAME/${ORGNAME}/g" < $file > $file.tmp1 # Try to find smb.conf if [ -e /usr/local/samba/lib/smb.conf ]; then CONF=/usr/local/samba/lib/smb.conf elif [ -e /etc/samba/smb.conf ]; then CONF=/etc/samba/smb.conf fi echo "Samba Config File Location [$CONF]: " echo echo "Enter a new full path or press Enter to continue." echo echo -n "Samba Config File Location [$CONF]: " read name if [ ! -z "$name" ]; then CONF=$name fi echo # Find the name of our Domain/Workgroup DOMNAME=`grep -i workgroup ${CONF} | sed "s/ //g" | cut -f2 -d=` echo Domain Name: $DOMNAME echo sed "s/DOMNAME/${DOMNAME}/g" < $file.tmp1 > $file.tmp2 DOMSID=`net getlocalsid ${DOMNAME} | cut -f2 -d: | sed "s/ //g"` echo Domain SID: $DOMSID sed "s/DOMSID/${DOMSID}/g" < $file.tmp2 > $file.tmp1 cat >>EOL The name of your Internet domain is now needed in a special format as follows, if your domain name is mydomain.org, what we need is the information in the form of: Domain ID: mydomain Top level: org If your fully qualified hostname is: snoopy.bazaar.garagesale.net where "snoopy" is the name of the machine, Then the information needed is: Domain ID: garagesale Top Level: net EOL INETDOMAIN=`hostname -d | cut -f1 -d.` echo Found the following domain name: `hostname -d` echo "I think the bit we are looking for might be: $INETDOMAIN" echo echo -n "Enter the domain name or press Enter to continue: " read domnam if [ ! -z $domnam ]; then INETDOMAIN=$domnam fi echo sed "s/INETDOMAIN/${INETDOMAIN}/g" < $file.tmp1 > $file.tmp2 TLDORG=`hostname -d | sed "s/${INETDOMAIN}.//g"` echo "The top level organization name I will use is: ${TLDORG}" echo echo -n "Enter the top level org name or press Enter to continue: " read domnam if [ ! -z $domnam ]; then TLDORG=$domnam fi sed "s/TLDORG/${TLDORG}/g" < $file.tmp2 > $DOMNAME.ldif rm $file.tmp* exit 0 dn: dc=INETDOMAIN,dc=TLDORG objectClass: dcObject objectClass: organization dc: INETDOMAIN o: ORGNAME description: Posix and Samba LDAP Identity Database structuralObjectClass: organization dn: cn=Manager,dc=INETDOMAIN,dc=TLDORG objectClass: organizationalRole cn: Manager description: Directory Manager structuralObjectClass: organizationalRole dn: ou=People,dc=INETDOMAIN,dc=TLDORG objectClass: top objectClass: organizationalUnit ou: People structuralObjectClass: organizationalUnit dn: ou=Computers,dc=INETDOMAIN,dc=TLDORG objectClass: top objectClass: organizationalUnit ou: Computers structuralObjectClass: organizationalUnit dn: ou=Groups,dc=INETDOMAIN,dc=TLDORG objectClass: top objectClass: organizationalUnit ou: Groups structuralObjectClass: organizationalUnit dn: ou=Idmap,dc=INETDOMAIN,dc=TLDORG objectClass: top objectClass: organizationalUnit ou: Idmap structuralObjectClass: organizationalUnit dn: sambaDomainName=DOMNAME,ou=Domains,dc=INETDOMAIN,dc=TLDORG objectClass: sambaDomain sambaDomainName: DOMNAME sambaSID: DOMSID sambaAlgorithmicRidBase: 1000 structuralObjectClass: sambaDomain dn: cn=domadmins,ou=Groups,dc=INETDOMAIN,dc=TLDORG objectClass: posixGroup objectClass: sambaGroupMapping gidNumber: 512 cn: domadmins sambaSID: DOMSID-512 sambaGroupType: 2 displayName: Domain Admins description: Domain Administrators structuralObjectClass: posixGroup dn: cn=domguests,ou=Groups,dc=INETDOMAIN,dc=TLDORG objectClass: posixGroup objectClass: sambaGroupMapping gidNumber: 514 cn: domguests sambaSID: DOMSID-514 sambaGroupType: 2 displayName: Domain Guests description: Domain Guests Users structuralObjectClass: posixGroup dn: cn=domusers,ou=Groups,dc=INETDOMAIN,dc=TLDORG objectClass: posixGroup objectClass: sambaGroupMapping gidNumber: 513 cn: domusers sambaSID: DOMSID-513 sambaGroupType: 2 displayName: Domain Users description: Domain Users structuralObjectClass: posixGroup LAM LDAP Account Manager LAM PHP unencrypted SSL Posix accountsmanage The LDAP Account Manager (LAM) is an application suite that has been written in PHP. LAM can be used with any Web server that has PHP4 support. It connects to the LDAP server either using unencrypted connections or via SSL. LAM can be used to manage Posix accounts as well as SambaSAMAccounts for users, groups, and Windows machines (hosts). LAM is available from the LAM home page and from its mirror sites. LAM has been released under the GNU GPL version 2. The current version of LAM is 0.4.3. Release of version 0.5 is expected some time early in 2004. PHP4 OpenLDAP Perl Requirements: A web server that will work with PHP4. PHP4 (available from the PHP home page.) OpenLDAP 2.0 or later. A Web browser that supports CSS. Perl. The gettext package. mcrypt + mhash (optional since version 0.4.3). It is also a good idea to install SSL support. LAM is a useful tool that provides a simple Web-based device that can be used to manage the contents of the LDAP directory to: organizational units operating profiles account policies Display user/group/host and Domain entries. Manages entries (Add/Delete/Edit). Filter and sort entries. Set LAM administrator accounts. Store and use multiple operating profiles. Edit organizational units (OUs). Upload accounts from a file. Is compatible with Samba-2.2.x and Samba-3. When correctly configured, LAM allows convenient management of UNIX (Posix) and Samba user, group, and windows domain member machine accounts. default password secure connections LAM SSL The default password is lam. It is highly recommended that you use only an SSL connection to your Web server for all remote operations involving LAM. If you want secure connections, you must configure your Apache Web server to permit connections to LAM using only SSL. Extract the LAM package with: &rootprompt; tar xzf ldap-account-manager_0.4.3.tar.gz Alternately, install the LAM RPM for your system using the following example for example: &rootprompt; rpm -Uvh ldap-account-manager-0.4.3-1.noarch.rpm Copy the extracted files to the document root directory of your Web server. For example, on SuSE Linux Enterprise Server 8, copy to the /srv/web/htdocs directory. file permissions Set file permissions using the following commands: &rootprompt; chown -R wwwrun.www /srv/www/htdocs/lam &rootprompt; chmod 755 /srv/www/htdocs/lam/sess &rootprompt; chmod 755 /srv/www/htdocs/lam/tmp &rootprompt; chmod 755 /srv/www/htdocs/lam/config &rootprompt; chmod 755 /srv/www/htdocs/lam/lib/*pl LAM configuration file Using your favorite editor create the following config.cfg LAM configuration file: &rootprompt; cd /srv/www/htdocs/lam/config &rootprompt; cp config.cfg_sample config.cfg &rootprompt; vi config.cfg LAM profile LAM wizard An example file is shown in . This is the minimum configuration that must be completed. The LAM profile file can be created using a convenient wizard that is part of the LAM configuration suite. Start your Web server then, using your Web browser, connect to LAM URL. Click on the the Configuration Login link then click on the Configuration Wizard link to begin creation of the default profile so that LAM can connect to your LDAP server. Alternately, copy the lam.conf_sample file to a file called lam.conf then, using your favorite editor, change the settings to match local site needs. pitfalls An example of a working file is shown here in . This file has been stripped of comments to keep the size small. The comments and help information provided in the profile file that the wizard creates is very useful and will help many administrators to avoid pitfalls. Your configuration file obviously reflects the configuration options that are preferred at your site. LAM login screen It is important that your LDAP server is running at the time that LAM is being configured. This permits you to validate correct operation. An example of the LAM login screen is provided in . The LDAP Account Manager Login Screen lam-login.png LAM configuration editor The LAM configuration editor has a number of options that must be managed correctly. An example of use of the LAM configuration editor is shown in . It is important that you correctly set the minimum and maximum UID/GID values that are permitted for use at your site. The default values may not be compatible with a need to modify initial default account values for well-known Windows network users and groups. The best work-around is to temporarily set the minimum values to zero (0) to permit the initial settings to be made. Do not forget to reset these to sensible values before using LAM to add additional users and groups. The LDAP Account Manager Configuration Screen lam-config.png PDF LAM has some nice, but unusual features. For example, one unexpected feature in most application screens permits the generation of a PDF file that lists configuration information. This is a well thought out facility. This option has been edited out of the following screen shots to conserve space. LAM opening screen When you log onto LAM the opening screen drops you right into the user manager as shown in . This is a logical action as it permits the most-needed facility to be used immediately. The editing of an existing user, as with the addition of a new user, is easy to follow and very clear in both layout and intent. It is a simple matter to edit generic settings, UNIX specific parameters, and then Samba account requirements. Each step involves clicking a button that intuitively drives you through the process. When you have finished editing simply press the Final button. The LDAP Account Manager User Edit Screen lam-users.png The edit screen for groups is shown in . As with the edit screen for user accounts, group accounts may be rapidly dealt with. shown a sub-screen from the group editor that permits users to be assigned secondary group memberships. The LDAP Account Manager Group Edit Screen lam-groups.png The LDAP Account Manager Group Membership Edit Screen lam-group-members.png smbldap-tools scripts The final screen presented here is one that you should not normally need to use. Host accounts will be automatically managed using the smbldap-tools scripts. This means that the screen will, in most cases, not be used. The LDAP Account Manager Host Edit Screen lam-hosts.png One aspect of LAM that may annoy some users is the way it forces certain conventions on the administrator. For example, LAM does not permit the creation of Windows user and group accounts that contain upper-case characters or spaces even though the underlying UNIX/Linux operating system may exhibit no problems with them. Given the propensity for using upper-case characters and spaces (particularly in the default Windows account names) this may cause some annoyance. For the rest, LAM is a very useful administrative tool. # password to add/delete/rename configuration profiles password: not24get # default profile, without ".conf" default: lam ServerURL: ldap://massive.abmas.org:389 Admins: cn=Manager,dc=abmas,dc=biz Passwd: not24get usersuffix: ou=People,dc=abmas,dc=biz groupsuffix: ou=Groups,dc=abmas,dc=biz hostsuffix: ou=Computers,dc=abmas,dc=biz domainsuffix: ou=Domains,dc=abmas,dc=biz MinUID: 0 MaxUID: 65535 MinGID: 0 MaxGID: 65535 MinMachine: 20000 MaxMachine: 25000 userlistAttributes: #uid;#givenName;#sn;#uidNumber;#gidNumber grouplistAttributes: #cn;#gidNumber;#memberUID;#description hostlistAttributes: #cn;#description;#uidNumber;#gidNumber maxlistentries: 30 defaultLanguage: en_GB:ISO-8859-1:English (Britain) scriptPath: scriptServer: samba3: yes cachetimeout: 5 pwdhash: SSHA SUID SGID The setting of the SUID/SGID bits on the file or directory permissions flag has particular consequences. If the file is executable and the SUID bit is set, it executes with the privilege of (with the UID of) the owner of the file. For example, if you are logged onto a system as a normal user (let's say as the user bobj), and you execute a file that is owned by the user root (uid = 0), and the file has the SUID bit set, then the file is executed as if you had logged in as the user root and then executed the file. The SUID bit effectively gives you (as bobj) administrative privilege for the use of that executable file. The setting of the SGID bit does precisely the same as the effect of the SUID bit, except that it applies the privilege to the UNIX group setting. In other words, the file executes with the force of capability of the group. When the SUID/SGID permissions are set on a directory, all files that are created within that directory is automatically given the ownership of the SUID user and the SGID group, as per the ownership of the directory in which the file is created. This means that the system level create() function executes with the SUID user and/or SGID group of the directory in which the file is created. If you want to obtain the SUID behavior, simply execute the following command: &rootprompt; chmod u+s file-or-directory To set the SGID properties on a file or a directory, execute this command: &rootprompt; chmod g+s file-or-directory And to set both SUID and SGID properties, execute the following: &rootprompt; chmod ug+s file-or-directory Let's consider the example of a directory /data/accounts. The permissions on this directory before setting both SUID and SGID on this directory are: &rootprompt; ls -al /data/accounts total 1 drwxr-xr-x 10 root root 232 Dec 18 17:08 . drwxr-xr-x 21 root root 600 Dec 17 23:15 .. drwxrwxrwx 2 bobj Domain Users 48 Dec 18 17:08 accounts/ drwx------ 2 root root 48 Jan 26 2002 lost+found In this example, if the user maryv creates a file, it would be owned by her. If maryv has the primary group of Accounts, the file is owned by the group Accounts as shown in this listing: &rootprompt; ls -al /data/accounts/maryvfile.txt drw-rw-r-- 2 maryv Accounts 12346 Dec 18 17:53 Now you set the SUID and SGID and check the result as follows: &rootprompt; chmod ug+s /data/accounts &rootprompt; ls -al /data/accounts total 1 drwxr-xr-x 10 root root 232 Dec 18 17:08 . drwxr-xr-x 21 root root 600 Dec 17 23:15 .. drwsrwsr-x 2 bobj Domain Users 48 Dec 18 17:08 accounts drwx------ 2 root root 48 Jan 26 2002 lost+found If maryv creates a file in this directory after this change has been made, the file is owned by the user bobj, and the group is set to the group Domain Users as shown here: &rootprompt; chmod ug+s /data/accounts &rootprompt; ls -al /data/accounts/maryvfile.txt total 1 drw-rw-r-- 2 bobj Domain Users 12346 Dec 18 18:11 maryvfile.txt data integrity multi-user data access The integrity of shared data is often viewed as a particularly emotional issue, especially where there are concurrent problems with multi-user data access. Contrary to the assertions of some who have experienced problems in either area, the cause has nothing to do with the phases of the moons of Jupiter. The solution to concurrent multi-user data access problems must consider three separate areas from which the problem may stem: locking Application level locking Client side locking Server side application level locking controls. client side locking controls. server side locking controls. database applications Microsoft Access Many database applications use some form of application-level access control. An example of one well-known application that uses application-level locking is Microsoft Access. Detailed guidance is provided given that this is the most common application for which problems have been reported. Microsoft Excel Act! Common applications that are affected by client- and server-side locking controls include MS Excel and Act!. Important locking guidance is provided here. The best advice that can be given is to carefully read the Microsoft knowledge base articles that cover this area. Examples of relevant documents includes: http://support.microsoft.com/default.aspx?scid=kb;en-us;208778 http://support.microsoft.com/default.aspx?scid=kb;en-us;299373 multi-user access exclusive open Make sure that your MS Access database file is configured for multi-user access (not set for exclusive open). Open MS Access on each client workstation then set the following: (Menu bar) ToolsOptions[tab] General . Set network path to Default database folder: \\server\share\folder. You can configure MS Access file sharing behavior as follows: click [tab] Advanced. Set: record locking Default open mode: Shared Default Record Locking: Edited Record Open databases using record_level locking MS Access validate You must now commit the changes so that they will take effect. To do so, click ApplyOk. At this point, you should exit MS Access, restart it and then validate that these settings have not changed. ACT! database data corruption Where the server sharing the ACT! database(s) is running Samba, Windows NT, 200x or XP, you must disable opportunistic locking on the server and all workstations. Failure to do so results in data corruption. This information is available from the Act! Web site knowledge-base articles 1998223162925 as well as from article 200110485036. opportunistic locking Act!Diag These documents clearly state that opportunistic locking must be disabled on both the server (Samba in the case we are interested in here), as well as on every workstation from which the centrally shared Act! database will be accessed. Act! provides a tool called Act!Diag that may be used to disable all workstation registry settings that may otherwise interfere with the operation of Act! Registered Act! users may download this utility from the Act! Web site. file cacheing Third-party Windows applications may not be compatible with the use of opportunistic file and record locking. For applications that are known not to be compatible,Refer to the application manufacturers' installation guidelines and knowledge base for specific information regarding compatibility. It is often safe to assume that if the software manufacturer does not specifically mention incompatibilities with opportunistic file and record locking, or with Windows client file cacheing, the application is probably compatible with Windows (as well as Samba) default settings. oplock support may need to be disabled both on the Samba server and on the Windows workstations. cache write lock flush cache memory Oplocks enable a Windows client to cache parts of a file that are being edited. Another windows client may then request to open the file with the ability to write to it. The server will then ask the original workstation that had the file open with a write lock to release it's lock. Before doing so, that workstation must flush the file from cache memory to the disk or network drive. Oplocks disabled Disabling of Oplocks usage may require server and client changes. Oplocks may be disabled by file, by file pattern, on the share, or on the samba server. The following are examples showing how Oplock support may be managed using Samba &smb.conf; file settings: By file: veto oplock files = myfile.mdb By Pattern: veto oplock files = /*.mdb/ On the Share: oplocks = No level2 oplocks = No On the server: (in [global]) oplocks = No level2 oplocks = No The following registry entries on Microsoft Windows XP Professional, 2000 Professional and Windows NT4 workstation clients must be configured as shown here: REGEDIT4 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ Services\LanmanServer\Parameters] "EnableOplocks"=dword:00000000 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ Services\LanmanWorkstation\Parameters] "UseOpportunisticLocking"=dword:00000000 Comprehensive coverage of file and record locking controls is provided in TOSHARG Chapter 13. The information provided in that chapter was obtained from a wide variety of sources.