- a sample PAM module
The SAMPLE service module for PAM is divided into four components: authentication, account management, password management, and session management. The sample module is a shared object that is dynamically loaded to provide the necessary functionality.
The SAMPLE authentication module provides functions to test the PAM framework functionality using the pam_sm_authenticate(3PAM) call. The SAMPLE module implementation of the pam_sm_authenticate(3PAM) function compares the user entered password with the password specified in the PAM configuration (see pam.conf(4)), or the string test if a default test password has not been set. The following options can be passed in to the SAMPLE Authentication module:
Syslog debugging information at the LOG_DEBUG level.
Sets the password to be newone.
The first password is always good when used with the use_first_pass or try_first_pass option.
The first password is always bad when used with the use_first_pass or try_first_pass option.
Always returns PAM_AUTH_ERR.
Always returns PAM_SUCCESS.
Always returns PAM_IGNORE.
Use the user's initial password (entered when the user is authenticated to the first authentication module in the stack) to authenticate with the SAMPLE module. If the passwords do not match, or if this is the first authentication module in the stack, quit and do not prompt the user for a password. It is recommended that this option only be used if the SAMPLE authentication module is designated as optional in the PAM configuration (see pam.conf(4)).
Use the user's initial password (entered when the user is authenticated to the first authentication module in the stack) to authenticate with the SAMPLE module. If the passwords do not match, or if this is the first authentication module in the stack, prompt the user for a password.
The SAMPLE module pam_sm_setcred(3PAM) function always returns PAM_SUCCESS.
The SAMPLE Account Management Component implements a simple access control scheme that limits machine access to a list of authorized users. The list of authorized users is supplied as option arguments to the entry for the SAMPLE account management PAM module in the PAM configuration (see pam.conf(4)). Note that the module always permits access to the root super user.
The option field syntax to limit access is shown below: allow= name[,name] allow= name [allow=name]
The example pam.conf show below permits only larry to login directly. rlogin is allowed only for don and larry. Once a user is logged in, the user can use su if the user are sam or eric.
The debug and nowarn options are also supported.
The SAMPLE Password Management Component function ( pam_sm_chauthtok(3PAM)), always returns PAM_SUCCESS.
See attributes(5) for description of the following attributes:
This module should never be used outside of a closed debug environment. The examples of the use_first_pass and try_first_pass options are obsolete for all other Solaris delivered PAM service modules
The interfaces in libpam() are MT-Safe only if each thread within the multi-threaded application uses its own PAM handle.