Linux System Administration Recipes A Problem-Solution Approach

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CHAPTER 2 ■ CENTRALIZING YOUR NETWORK: KERBEROS, LDAP, AND NFS# Everyone can read everythingaccess to dn.base="" by * read# The admin dn has full write accessaccess to *by dn="uid=ldapadm,ou=people,dc=example,dc=com" writeby * read# Temporary lines to allow initial setuprootdn "cn=admin,dc=example,dc=com"rootpw secretYou’ll generate the specified ldapadm user in a moment.■ Note You must not have comment lines between the access and by lines in this file! This will prevent it fromworking.With the standard setup as described earlier, the ACLs will apply only to a specific database. Tomake them apply globally (although in this setup you don’t have any other databases!), put them beforethe database back-end definitions.If you’re using a self-signed certificate, put this line in /etc/ldap/ldap.conf:TLS_REQCERTallowThis allows clients to request the TLS server certificate from the server.■ Note If you need it, there is more config information for TLS/SSL in the OpenLDAP FAQ at http://www.openldap.org/faq/data/cache/185.html. There’s also an Administrator’s Guide at http://www.openldap.org/doc/admin24/.To separate the slapd logs from the general systems logging, add this line to /etc/syslog.conf:local4.*/var/log/slapd.log2-4. Finishing the LDAP Setup: Authenticating with KerberosAdd the LDAP admin user and the LDAP server to Kerberos by running kadmin -p krbadm from the LDAPhost and executing these commands:32Download at WoweBook.Com
CHAPTER 2 ■ CENTRALIZING YOUR NETWORK: KERBEROS, LDAP, AND NFSaddprinc ldapadm@EXAMPLE.COMaddprinc -randkey ldap/server.example.comktadd -k /etc/ldap/ldap.keytab ldap/server.example.comThe first command creates the admin user. You’ll be asked for a password. Call this user whateveryou like, but it should match what you set in the access controls. You should extract the server key to akeytab other than the system one at /etc/krb5.keytab (the -k flag specifies this alternate keytab), sincethe LDAP keytab must be owned by the LDAP user, and you don’t want the main keytab to be owned bythe LDAP user:chown openldap:openldap /etc/ldap/ldap.keytabTo ensure that slapd is looking at this keytab, add the following line to /etc/default/slapd:export KRB5_KTNAME=/etc/ldap/ldap.keytabRestart slapd:/etc/init.d/slapd restart■ Note If there are problems with startup, change the log level in /etc/ldap/slapd.conf to 16383 to getverbose logging in the log file. Change it back before you go into production, though, because it makes the serververy slow.Setting Up the DatabaseTo set up the database, you first use the authentication in the rootdn and rootpw directives to add theroot entry, the People group, and an admin user. You should have added the admin user when you setup Kerberos as in recipe 2-1. Here it’s ldapadm.For this you need to create a “setup” LDIF file (setup.ldif). Your base domain will depend on yourorganization. It is a good idea to use a base domain that is related to your Kerberos domain and also toyour IP domain. Here we use dc=example,dc=com (matching example.com).# setup.ldifdn: dc=example,dc=comobjectclass: organizationobjectclass: dcObjectobjectclass: topo: Example Companydc: exampledescription: root entry33Download at WoweBook.Com
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Page 7 and 8: Contents■About the Author .......
Page 9 and 10: ■ CONTENTS3-7. Writing a Nagios P
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Page 13 and 14: ■ CONTENTSAbout the Author■Juli
Page 15 and 16: ■ CONTENTSAcknowledgmentsMany tha
Page 17 and 18: ■ CONTENTSIntroductionThis book i
Page 19 and 20: ■ INTRODUCTIONDownloading the Cod
Page 21 and 22: C H A P T E R 1■ ■ ■Saving Yo
Page 23 and 24: CHAPTER 1 ■ SAVING YOURSELF EFFOR
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C H A P T E R 4■ ■ ■Taking Ba
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CHAPTER 4 ■ TAKING BACKUPS AND MA
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C H A P T E R 5■ ■ ■Working w
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CHAPTER 5 ■ WORKING WITH FILESYST
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C H A P T E R 6■ ■ ■Securing
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CHAPTER 6 ■ SECURING YOUR SYSTEMS
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CHAPTER 7 ■ WORKING WITH APACHEOn
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C H A P T E R 8■ ■ ■Making Be
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CHAPTER 8 ■ USING THE COMMAND LIN
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CHAPTER 9 ■ WORKING WITH TEXT IN
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C H A P T E R 10■ ■ ■Things G
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CHAPTER 10 ■ THINGS GO IN, THINGS
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C H A P T E R 11■ ■ ■Tracking
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CHAPTER 11 ■ TRACKING DOWN BUGSTh
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CHAPTER 11 ■ TRACKING DOWN BUGS#
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C H A P T E R 12■ ■ ■Managing
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CHAPTER 12 ■ MANAGING TIME AND PE
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APPENDIX■ ■ ■Perl TipsSee rec
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APPENDIX ■ PERL TIPS• Date::Par
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APPENDIX ■ PERL TIPSPerl Syntax N
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■ ■ ■Index■Symbols$CDPATH,
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■ INDEXenscript option (printing)
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■ INDEX■NNagiosadding hosts to,
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■ INDEXsyslogcentralized logging
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Linux System Administration Recipes A Problem-Solution Approach

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