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Linux 2.6 - man page for pam_keyinit (linux section 8)

PAM_KEYINIT(8)				 Linux-PAM Manual			   PAM_KEYINIT(8)

NAME
       pam_keyinit - Kernel session keyring initialiser module

SYNOPSIS
       pam_keyinit.so [debug] [force] [revoke]

DESCRIPTION
       The pam_keyinit PAM module ensures that the invoking process has a session keyring other
       than the user default session keyring.

       The session component of the module checks to see if the process's session keyring is the
       user default, and, if it is, creates a new anonymous session keyring with which to replace
       it.

       If a new session keyring is created, it will install a link to the user common keyring in
       the session keyring so that keys common to the user will be automatically accessible
       through it.

       The session keyring of the invoking process will thenceforth be inherited by all its
       children unless they override it.

       This module is intended primarily for use by login processes. Be aware that after the
       session keyring has been replaced, the old session keyring and the keys it contains will
       no longer be accessible.

       This module should not, generally, be invoked by programs like su, since it is usually
       desirable for the key set to percolate through to the alternate context. The keys have
       their own permissions system to manage this.

       This module should be included as early as possible in a PAM configuration, so that other
       PAM modules can attach tokens to the keyring.

       The keyutils package is used to manipulate keys more directly. This can be obtained from:

       Keyutils[1]

OPTIONS
       debug
	   Log debug information with syslog(3).

       force
	   Causes the session keyring of the invoking process to be replaced unconditionally.

       revoke
	   Causes the session keyring of the invoking process to be revoked when the invoking
	   process exits if the session keyring was created for this process in the first place.

MODULE TYPES PROVIDED
       Only the session module type is provided.

RETURN VALUES
       PAM_SUCCESS
	   This module will usually return this value

       PAM_AUTH_ERR
	   Authentication failure.

       PAM_BUF_ERR
	   Memory buffer error.

       PAM_IGNORE
	   The return value should be ignored by PAM dispatch.

       PAM_SERVICE_ERR
	   Cannot determine the user name.

       PAM_SESSION_ERR
	   This module will return this value if its arguments are invalid or if a system error
	   such as ENOMEM occurs.

       PAM_USER_UNKNOWN
	   User not known.

EXAMPLES
       Add this line to your login entries to start each login session with its own session
       keyring:

	   session  required  pam_keyinit.so

       This will prevent keys from one session leaking into another session for the same user.

SEE ALSO
       pam.conf(5), pam.d(5), pam(7) keyctl(1)

AUTHOR
       pam_keyinit was written by David Howells, <dhowells@redhat.com>.

NOTES
	1. Keyutils
	   http://people.redhat.com/~dhowells/keyutils/

Linux-PAM Manual			    06/04/2011				   PAM_KEYINIT(8)


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