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The actual means of authentication supported by PAM include the following authentication modules:
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Module Description Manages passwords Implements password querying Supports authentication modifications Used for Diffie-Hellman authentication in secure RPC Supports login authentication Core Kerberos authentication modules Main LDAP authentication module Supports passwd authentication Provides equivalent host and automatic logins using ~/.rhosts and /etc/host.equiv files Role-based account management Testing facility Facilitates smart-card authentication Provides UNIX-style password management Provides UNIX-style authentication support Provides UNIX-style credential support Provides UNIX-style session administration
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pam_authtok_check.so.1 pam_authtok_get.so.1 pam_authtok_store.so.1 pam_dhkeys.so.1 pam_dial_auth.so.1 pam_krb5.so.1 pam_ldp.so.1 pam_passwd_auth.so.1 pam_rhosts_auth.so.1 pam_roles.so.1 pam_sample.so.1 pam_smartcard.so.1 pam_unix_account.so.1 pam_unix_auth.so.1 pam_unix_cred.so.1 pam_unix_session.so.1
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The following examples demonstrate how to configure PAM for both Kerberized and non-Kerberized services for distributed and flexible authentication services.
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Non-Kerberized Services
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The login service can be set up to invoke the pam_authtok_get.so.1 module first and, if it succeeds, then invoke all the other modules. If invoking pam_authtok_get.so.1 fails, then the other modules are not invoked and because they must all succeed for the authentication to succeed, the authentication fails. The following example shows how this can be implemented in /etc/pam.conf:
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login login login login login auth auth auth auth auth requisite required required required required pam_authtok_get.so.1 pam_dhkeys.so.1 pam_unix_cred.so.1 pam_unix_auth.so.1 pam_dial_auth.so.1
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Kerberos and Pluggable Authentication
The rlogin service is similar to the login configuration, but has a sufficient condition attached to the pam_rhosts_auth.so.1 module that is invoked first. If this is successful, then no further modules are invoked; otherwise, the rlogin authentication sequence follows the standard login sequence previously described. The following example shows how this can be implemented in /etc/pam.conf:
rlogin rlogin rlogin rlogin rlogin auth auth auth auth auth sufficient requisite required required required pam_rhosts_auth.so.1 pam_authtok_get.so.1 pam_dhkeys.so.1 pam_unix_cred.so.1 pam_unix_auth.so.1
The rsh service has fewer restrictions than rlogin if the pam_rhosts_auth.so.1 module fails to authenticate, then the pam_unix_cred.so.1 module is invoked, as shown in the following /etc/pam.conf example:
rsh rsh auth sufficient auth required pam_rhosts_auth.so.1 pam_unix_cred.so.1
Other services, such as PPP, follow their own paths password prompting by pam_ authtok_get.so.1 is a prerequisite to the use of Diffie-Hellman key support for authentication, and so on, as shown in the following example:
ppp ppp ppp ppp ppp auth auth auth auth auth requisite required required required required pam_authtok_get.so.1 pam_dhkeys.so.1 pam_unix_cred.so.1 pam_unix_auth.so.1 pam_dial_auth.so.1
Kerberized Services
To configure broad support for Kerberized services in /etc/pam.conf, the following configuration can be used:
login other cron other other other auth optional auth optional account optional account optional session optional password optional pam_krb5.so.1 pam_krb5.so.1 pam_krb5.so.1 pam_krb5.so.1 pam_krb5.so.1 pam_krb5.so.1
This links services like login and cron to the underlying Kerberos authentication module. For each Kerberized application, there is an auth required condition for pam_ authtok_get.so.1 and for pam_unix_auth.so.1, in addition to an auth binding condition for
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pam_krb5.so.1. The following examples show the configuration for krlogin, but it would be the same for krsh and ktelnet with the appropriate service name changes:
krlogin krlogin krlogin auth required auth binding auth required pam_unix_cred.so.1 pam_krb5.so.1 pam_unix_auth.so.1
Command Reference
The following commands are used to interact with Kerberos.
kadmin
The kadmin command is used to manage local Kerberos services, by administering keytabs, principals, and policies. There are two versions of kadmin available: kadmin .local is used only on the master KDC and does not require authentication. However, kadmin, when executed on any other server, requires Kerberos authentication across a secure link. Once logged in, the following prompt is displayed, ready for commands to be entered:
kadmin:
When kadmin starts up, it checks the value of the USER environment variable to determine the principal name. For example, if USER=pwatters, then the principal name would be pwatters/admin. Alternatively, the p option can be passed to kadmin when starting up, followed by the principal name. In addition, if a realm other than the default is to be administered, the realm name must be supplied on the command line after the r option is passed. The user will be prompted for a password, unless one has been passed on the command line with the w option. Thus, to start kadmin for the realm cassowary.net with the principal pwatters/admin and the password 6fgj4gsd, the following command would be used:
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