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    Command:

    pam_sm_chauthtok

    
    
    
    

    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.
    
               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

               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 03/02/2009 PAM_SM_CHAUTHTOK(3)

    
    
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