pam_sm_chauthtok man page on CentOS

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PAM_SM_CHAUTHTOK(3)	       Linux-PAM Manual		   PAM_SM_CHAUTHTOK(3)

NAME
       pam_sm_chauthtok - PAM service function for authentication token
       management

SYNOPSIS
       #define PAM_SM_PASSWORD

       #include <security/pam_modules.h>

       PAM_EXTERN 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 users 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.

       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)

Linux-PAM Manual		  06/27/2006		   PAM_SM_CHAUTHTOK(3)
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