table of contents
MISC_CONV(3) | Linux-PAM Manual | MISC_CONV(3) |
NAME¶
misc_conv - text based conversation functionSYNOPSIS¶
#include <security/pam_misc.h>
int misc_conv(int num_msg,
const struct pam_message **msgm,
struct pam_response **response,
void *appdata_ptr);
DESCRIPTION¶
The misc_conv function is part of libpam_misc and not of the standard libpam library. This function will prompt the user with the appropriate comments and obtain the appropriate inputs as directed by authentication modules. In addition to simply slotting into the appropriate pam_conv(3), this function provides some time-out facilities. The function exports five variables that can be used by an application programmer to limit the amount of time this conversation function will spend waiting for the user to type something. The five variabls are as follows: time_t pam_misc_conv_warn_time;This variable contains the time (as returned by
time(2)) that the user should be first warned that the clock is
ticking. By default it has the value 0, which indicates that no such warning
will be given. The application may set its value to sometime in the future,
but this should be done prior to passing control to the Linux-PAM
library.
const char *pam_misc_conv_warn_line;
Used in conjuction with pam_misc_conv_warn_time,
this variable is a pointer to the string that will be displayed when it
becomes time to warn the user that the timeout is approaching. Its default
value is a translated version of “...Time is running out...”,
but this can be changed by the application prior to passing control to
Linux-PAM.
time_t pam_misc_conv_die_time;
This variable contains the time (as returned by
time(2)) that the will time out. By default it has the value 0, which
indicates that the conversation function will not timeout. The application may
set its value to sometime in the future, but this should be done prior to
passing control to the Linux-PAM library.
const char *pam_misc_conv_die_line;
Used in conjuction with pam_misc_conv_die_time,
this variable is a pointer to the string that will be displayed when the
conversation times out. Its default value is a translated version of
“...Sorry, your time is up!”, but this can be changed by the
application prior to passing control to Linux-PAM.
int pam_misc_conv_died;
Following a return from the Linux-PAM libraray,
the value of this variable indicates whether the conversation has timed out. A
value of 1 indicates the time-out occurred.
The following two function pointers are available for supporting binary prompts
in the conversation function. They are optimized for the current incarnation
of the libpamc library and are subject to change.
int (*pam_binary_handler_fn)(void *appdata,
pamc_bp_t * prompt_p);
This function pointer is initialized to NULL but can be
filled with a function that provides machine-machine (hidden) message
exchange. It is intended for use with hidden authentication protocols such as
RSA or Diffie-Hellman key exchanges. (This is still under development.)
int (*pam_binary_handler_free)(void *appdata,
pamc_bp_t * delete_me);
This function pointer is initialized to
PAM_BP_RENEW(delete_me, 0, 0), but can be redefined as desired by the
application.
SEE ALSO¶
pam_conv(3), pam(7)STANDARDS¶
The misc_conv function is part of the libpam_misc Library and not defined in any standard.09/19/2013 | Linux-PAM Manual |