mirror of https://github.com/0intro/conterm
51 lines
1.1 KiB
C
51 lines
1.1 KiB
C
#include <u.h>
|
|
#include <libc.h>
|
|
#include <auth.h>
|
|
#include <authsrv.h>
|
|
#include "authlocal.h"
|
|
|
|
/*
|
|
* compute the proper response. We encrypt the ascii of
|
|
* challenge number, with trailing binary zero fill.
|
|
* This process was derived empirically.
|
|
* this was copied from inet's guard.
|
|
*/
|
|
static void
|
|
netresp(char *key, long chal, char *answer)
|
|
{
|
|
uchar buf[8];
|
|
|
|
memset(buf, 0, 8);
|
|
sprint((char *)buf, "%lud", chal);
|
|
if(encrypt(key, buf, 8) < 0)
|
|
abort();
|
|
chal = (buf[0]<<24)+(buf[1]<<16)+(buf[2]<<8)+buf[3];
|
|
sprint(answer, "%.8lux", chal);
|
|
}
|
|
|
|
AuthInfo*
|
|
auth_userpasswd(char *user, char *passwd)
|
|
{
|
|
char key[DESKEYLEN], resp[16];
|
|
AuthInfo *ai;
|
|
Chalstate *ch;
|
|
|
|
/*
|
|
* Probably we should have a factotum protocol
|
|
* to check a raw password. For now, we use
|
|
* p9cr, which is simplest to speak.
|
|
*/
|
|
if((ch = auth_challenge("user=%q proto=p9cr role=server", user)) == nil)
|
|
return nil;
|
|
|
|
passtokey(key, passwd);
|
|
netresp(key, atol(ch->chal), resp);
|
|
memset(key, 0, sizeof key);
|
|
|
|
ch->resp = resp;
|
|
ch->nresp = strlen(resp);
|
|
ai = auth_response(ch);
|
|
auth_freechal(ch);
|
|
return ai;
|
|
}
|