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PAM_SM_CHAUTHTOK
Section: Linux-PAM Manual (3) Updated: 04/01/2016 Index
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NAME
pam_sm_chauthtok - PAM service function for authentication token management
SYNOPSIS
#define PAM_SM_PASSWORD
#include <security/pam_modules.h>
-
int pam_sm_chauthtok(pam_handle_t *pamh, int flags, int argc, const char **argv);
DESCRIPTION
The
pam_sm_chauthtok
function is the service module's implementation of the
pam_chauthtok(3)
interface.
This function is used to (re-)set the authentication token of the user.
Valid flags, which may be logically OR'd with
PAM_SILENT, are:
PAM_SILENT
-
Do not emit any messages.
PAM_CHANGE_EXPIRED_AUTHTOK
-
This argument indicates to the module that the user's authentication token (password) should only be changed if it has expired. This flag is optional and
must
be combined with one of the following two flags. Note, however, the following two options are
mutually exclusive.
PAM_PRELIM_CHECK
-
This indicates that the modules are being probed as to their ready status for altering the user's authentication token. If the module requires access to another system over some network it should attempt to verify it can connect to this system on receiving this flag. If a module cannot establish it is ready to update the user's authentication token it should return
PAM_TRY_AGAIN, this information will be passed back to the application.
If the control value
sufficient
is used in the password stack, the
PAM_PRELIM_CHECK
section of the modules following that control value is not always executed.
PAM_UPDATE_AUTHTOK
-
This informs the module that this is the call it should change the authorization tokens. If the flag is logically OR'd with
PAM_CHANGE_EXPIRED_AUTHTOK, the token is only changed if it has actually expired.
The PAM library calls this function twice in succession. The first time with
PAM_PRELIM_CHECK
and then, if the module does not return
PAM_TRY_AGAIN, subsequently with
PAM_UPDATE_AUTHTOK. It is only on the second call that the authorization token is (possibly) changed.
RETURN VALUES
PAM_AUTHTOK_ERR
-
The module was unable to obtain the new authentication token.
PAM_AUTHTOK_RECOVERY_ERR
-
The module was unable to obtain the old authentication token.
PAM_AUTHTOK_LOCK_BUSY
-
Cannot change the authentication token since it is currently locked.
PAM_AUTHTOK_DISABLE_AGING
-
Authentication token aging has been disabled.
PAM_PERM_DENIED
-
Permission denied.
PAM_TRY_AGAIN
-
Preliminary check was unsuccessful. Signals an immediate return to the application is desired.
PAM_SUCCESS
-
The authentication token was successfully updated.
PAM_USER_UNKNOWN
-
User unknown to password service.
SEE ALSO
pam(3),
pam_chauthtok(3),
pam_sm_chauthtok(3),
pam_strerror(3),
PAM(8)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUES
-
- SEE ALSO
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