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pam_keyinit(8) [linux man page]

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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KEYCTL_JOIN_SESSION_KEYRING(3)				    Linux Key Management Calls				    KEYCTL_JOIN_SESSION_KEYRING(3)

NAME
keyctl_join_session_keyring - Join a different session keyring SYNOPSIS
#include <keyutils.h> key_serial_t keyctl_join_session_keyring(const char *name); DESCRIPTION
keyctl_join_session_keyring() changes the session keyring to which a process is subscribed. If name is NULL then a new anonymous keyring will be created, and the process will be subscribed to that. If name points to a string, then if a keyring of that name is available, the process will attempt to subscribe to that keyring, giving an error if that is not permitted; otherwise a new keyring of that name is created and attached as the session keyring. To attach to an extant named keyring, the keyring must have search permission available to the calling process. RETURN VALUE
On success keyctl_join_session_keyring() returns the serial number of the key it found or created. On error, the value -1 will be returned and errno will have been set to an appropriate error. ERRORS
ENOMEM Insufficient memory to create a key. EDQUOT The key quota for this user would be exceeded by creating this key or linking it to the keyring. EACCES The named keyring exists, but is not searchable by the calling process. LINKING
This is a library function that can be found in libkeyutils. When linking, -lkeyutils should be specified to the linker. SEE ALSO
keyctl(1), add_key(2), keyctl(2), request_key(2), keyctl_get_keyring_ID(3), keyctl_update(3), keyctl_revoke(3), keyctl_chown(3), keyctl_setperm(3), keyctl_describe(3), keyctl_clear(3), keyctl_link(3), keyctl_unlink(3), keyctl_search(3), keyctl_read(3), keyctl_instantiate(3), keyctl_negate(3), keyctl_set_reqkey_keyring(3), keyctl_set_timeout(3), keyctl_assume_authority(3), keyctl_describe_alloc(3), keyctl_read_alloc(3), request-key(8) Linux 4 May 2006 KEYCTL_JOIN_SESSION_KEYRING(3)
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