PAM_OPEN_SESSION(3PAM)PAM_OPEN_SESSION(3PAM)NAME
pam_open_session, pam_close_session - perform PAM session creation and
termination operations
SYNOPSIS
cc [ flag ... ] file ... -lpam [ library ... ]
#include <security/pam_appl.h>
int pam_open_session(pam_handle_t *pamh, int flags);
int pam_close_session(pam_handle_t *pamh, int flags);
DESCRIPTION
The pam_open_session() function is called after a user has been suc‐
cessfully authenticated. See pam_authenticate(3PAM) and
pam_acct_mgmt(3PAM). It is used to notify the session modules that a
new session has been initiated. All programs that use the pam(3PAM)
library should invoke pam_open_session() when beginning a new session.
Upon termination of this activity, pam_close_session() should be
invoked to inform pam(3PAM) that the session has terminated.
The pamh argument is an authentication handle obtained by a prior call
to pam_start(). The following flag may be set in the flags field for
pam_open_session() and pam_close_session():
PAM_SILENT
The session service should not generate any messages.
RETURN VALUES
Upon successful completion, PAM_SUCCESS is returned. In addition to
the return values defined in pam(3PAM), the following value may be
returned on error:
PAM_SESSION_ERR
Cannot make or remove an entry for the specified
session.
ATTRIBUTES
See attributes(5) for description of the following attributes:
┌────────────────────┬─────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼─────────────────────────┤
│Interface Stability │ Stable │
├────────────────────┼─────────────────────────┤
│MT-Level │ MT-Safe with exceptions │
└────────────────────┴─────────────────────────┘
SEE ALSOgetutxent(3C), pam(3PAM), pam_acct_mgmt(3PAM), pam_authenticate(3PAM),
pam_start(3PAM), attributes(5)NOTES
In many instances, the pam_open_session() and pam_close_session() calls
may be made by different processes. For example, in UNIX the login
process opens a session, while the init process closes the session. In
this case, UTMP/WTMP entries may be used to link the call to
pam_close_session() with an earlier call to pam_open_session(). This
is possible because UTMP/WTMP entries are uniquely identified by a com‐
bination of attributes, including the user login name and device name,
which are accessible through the PAM handle, pamh. The call to
pam_open_session() should precede UTMP/WTMP entry management, and the
call to pam_close_session() should follow UTMP/WTMP exit management.
The interfaces in libpam are MT-Safe only if each thread within the
multithreaded application uses its own PAM handle.
Oct 13, 1998 PAM_OPEN_SESSION(3PAM)
