Content-type: text/html Man page of pam_authtok_get

pam_authtok_get

Section: Standards, Environments, and Macros (5)
Updated: 14 Dec 2004
Index Return to Main Contents
 

NAME

pam_authtok_get - authentication and password management module  

SYNOPSIS

pam_authtok_get.so.1
 

DESCRIPTION

The pam_authtok_get service module provides password prompting funtionality to the PAM stack. It implements pam_sm_authenticate() and pam_sm_chauthtok(), providing functionality to both the Authentication Stack and the Password Management Stack.  

Authentication Service

The implementation of pam_sm_authenticate(3PAM) prompts the user name if not set and then tries to get the authentication token from the pam handle. If the token is not set, it then prompts the user for a password and stores it in the PAM item PAM_AUTHTOK. This module is meant to be the first module on an authentication stack where users are to authenticate using a keyboard.  

Password Management Service

Due to the nature of the PAM Password Management stack traversal mechanism, the pam_sm_chauthtok(3PAM) function is called twice. Once with the PAM_PRELIM_CHECK flag, and one with the PAM_UPDATE_AUTHTOK flag.

In the first (PRELIM) invocation, the implementation of pam_sm_chauthtok(3PAM) moves the contents of the PAM_AUTHTOK (current authentication token) to PAM_OLDAUTHTOK, and subsequentially prompts the user for a new password. This new password is stored in PAM_AUTHTOK.

If a previous module has set PAM_OLDAUTHTOK prior to the invocation of pam_authtok_get, this module turns into a NO-OP and immediately returns PAM_SUCCESS.

In the second (UPDATE) invocation, the user is prompted to Re-enter his password. The pam_sm_chauthtok implementation verifies this reentered password with the password stored in PAM_AUTHTOK. If the passwords match, the module returns PAM_SUCCESS.

The following option can be passed to the module:

debug syslog(3C) debugging information at the LOG_DEBUG level

 

ERRORS

The authentication service returns the following error codes:

PAM_SUCCESS Successfully obtains authentication token

PAM_SYSTEM_ERR Fails to retrieve username, username is NULL or empty

The password management service returns the following error codes:

PAM_SUCCESS Successfully obtains authentication token

PAM_AUTHTOK_ERR Authentication token manipulation error

 

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
Interface StabilityEvolving
MT LevelMT-Safe with exceptions

 

SEE ALSO

pam(3PAM), pam_authenticate(3PAM), syslog(3C), libpam(3LIB), pam.conf(4), attributes(5), pam_authtok_check(5), pam_authtok_get(5), pam_authtok_store(5), pam_dhkeys(5), pam_passwd_auth(5), pam_unix_account(5), pam_unix_auth(5), pam_unix_session(5)  

NOTES

The interfaces in libpam(3LIB) are MT-Safe only if each thread within the multi-threaded application uses its own PAM handle.

The pam_unix(5) module is no longer supported. Similar functionality is provided by pam_authtok_check(5), pam_authtok_get(5), pam_authtok_store(5), pam_dhkeys(5), pam_passwd_auth(5), pam_unix_account(5), pam_unix_auth(5), and pam_unix_session(5).


 

Index

NAME
SYNOPSIS
DESCRIPTION
Authentication Service
Password Management Service
ERRORS
ATTRIBUTES
SEE ALSO
NOTES

This document was created by man2html, using the manual pages.
Time: 02:39:49 GMT, October 02, 2010