PAM_KEYINIT(8) Linux-PAM Manual PAM_KEYINIT(8)
pam_keyinit - Kernel session keyring initialiser module
pam_keyinit.so [debug] [force] [revoke]
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
This module should be included as early as possible in a PAM
configuration, so that other PAM modules can attach tokens to the
The keyutils package is used to manipulate keys more directly. This can
be obtained from:
Log debug information with syslog(3).
Causes the session keyring of the invoking process to be replaced
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.
This module will usually return this value
Memory buffer error.
The return value should be ignored by PAM dispatch.
Cannot determine the user name.
This module will return this value if its arguments are invalid or
if a system error such as ENOMEM occurs.
User not known.
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.
pam.conf(5), pam.d(5), pam(7)keyctl(1)
pam_keyinit was written by David Howells, <email@example.com>.
Linux-PAM Manual 09/19/2013 PAM_KEYINIT(8)
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