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Kerberos and Pluggable Authentication
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acl_file = /etc/krb5/kadm5.acl kadmind_port = 749 max_life = 8h 0m 0s max_renewable_life = 7d 0h 0m 0s default_principal_flags = +preauth }
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This configuration for CASSOWARY.NET defines the profile and database names, port numbers, etc. for the KDC administration. The access control list (ACL) file for administration authorizations within the domain is also contained in the acl_file. To initialize the primary KDC, you use the kdb5_util command:
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# /usr/sbin/kdb5_util create -r CASSOWARY.NET -s Initializing database '/var/krb5/principal' for realm 'CASSOWARY.NET', master key name 'K/M@CASSOWARY.NET' You will be prompted for the database Master Password. It is important that you NOT FORGET this password. Enter KDC database master key: Re-enter KDC database master key to verify:
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Next, you add entries to the /etc/krb5/kadm5.acl file for the principals who have permissions to administer the database. The following entry gives pwatters/admin@ CASSOWARY.NET unlimited authority to modify the database and associated policies:
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pwatters/admin@CASSOWARY.NET *
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To add this principal to the database, you use the kadmin.local command, and type in addprinc pwatters/admin when prompted:
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# kadmin.local Authenticating as principal pwatters/admin@CASSOWARY.NET with password. kadmin.local: addprinc pwatters/admin Enter password for principal "pwatters/admin@CASSOWARY.NET": Re-enter password for principal "pwatters/admin@CASSOWARY.NET": Principal "pwatters/admin@CASSOWARY.NET" created.
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At the kadmin.local prompt, you next need to initialize the keytab files for basic administrative operations for the administrator:
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kadmin.local: ktadd -k /etc/krb5/kadm5.keytab kadmin/ kerberos1.cassowary.net Entry for principal kadmin/kerberos1.cassowary.net with kvno 3, encryption type DES-CBC-CRC added to keytab WRFILE:/etc/krb5/kadm5.keytab. kadmin.local: ktadd -k /etc/krb5/kadm5.keytab changepw/kdc1.example.com Entry for principal kadmin/kerberos1.cassowary.net with kvno 3,
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Part III:
Security
encryption type DES-CBC-CRC added to keytab WRFILE:/etc/krb5/kadm5.keytab. kadmin.local: ktadd -k /etc/krb5/kadm5.keytab kadmin/changepw Entry for principal kadmin/kerberos1.cassowary.net with kvno 3, encryption type DES-CBC-CRC added to keytab WRFILE:/etc/krb5/kadm5.keytab. kadmin.local:quit
The KDC can now be started by using the following commands:
# /etc/init.d/kdc start # /etc/init.d/kdc.master start
As with any security service, there are risks that should be noted before implementation. In particular, there have been bugs in syslog that can lead to a possible denial-of-service attack. This risk highlights the potential for attacks against a centralized service being the weakest point of the Kerberos system. Even if the authentication server and target server were operational, for example, a sustained flood of requests to a ticket-granting server can halt any network-based service that requires authentication.
The /etc/pam.conf file contains a set of entries that associates services and applications requiring authentication with specific PAM modules. Each entry consists of a space or tab-limited tokens representing the following: The name of the application or service requiring authentication The type of PAM module required A flag that determines the failure modes for the entry The path to the PAM library Any other options There are several module types that are supported by PAM, including the following: Authentication modules (auth) Implement user-based authentication Account modules (account) Implement more general account management activities, such as password aging Password modules (password) Implement password modifications Session modules (session) Support login sessions
13:
Kerberos and Pluggable Authentication
Obviously, a service may require some or all of these functions each module requires one entry for each service it is associated with in /etc/pam.conf. The following list shows some commonly used applications requiring authentication and their matching module types:
Application cron dtlogin dtsession ftp init login passwd ppp rlogin rsh sac sshd telnet Module Types
auth, account auth, account, session auth auth, account, session session auth, account, session auth, password auth, account, session auth, account, session auth, account, session auth, account, session auth, account, password, session auth, account, session
Five flags control operational and failure modes for PAM. These flags define how to handle a successful or failed authentication. For example, you may provide multiple means of authentication, but require only that one is satisfied for the user to be authenticated, or you might require that all must be satisfied before a user is authenticated. The following are the flags supported by PAM: binding If authentication is successful, skip any other modules listed and report the user as authenticated, but return a failure if not authenticated. required If authentication is not successful, check all others, but report the authentication as failed. requisite If authentication is not successful, check no others, and report the authentication as failed. optional If authentication is not successful, check all others, and report the authentication as successful if any other means succeeds. sufficient If authentication is successful, skip any others listed and report the user as authenticated, but check all other means if failure is recorded.
Part III:
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