1 be8b315d 2004-06-17 devnull #include <u.h>
2 be8b315d 2004-06-17 devnull #include <libc.h>
3 be8b315d 2004-06-17 devnull #include <auth.h>
4 be8b315d 2004-06-17 devnull #include <authsrv.h>
5 be8b315d 2004-06-17 devnull #include "authlocal.h"
8 be8b315d 2004-06-17 devnull * compute the proper response. We encrypt the ascii of
9 be8b315d 2004-06-17 devnull * challenge number, with trailing binary zero fill.
10 be8b315d 2004-06-17 devnull * This process was derived empirically.
11 be8b315d 2004-06-17 devnull * this was copied from inet's guard.
13 be8b315d 2004-06-17 devnull static void
14 be8b315d 2004-06-17 devnull netresp(char *key, long chal, char *answer)
16 be8b315d 2004-06-17 devnull uchar buf[8];
18 be8b315d 2004-06-17 devnull memset(buf, 0, 8);
19 be8b315d 2004-06-17 devnull sprint((char *)buf, "%lud", chal);
20 be8b315d 2004-06-17 devnull if(encrypt(key, buf, 8) < 0)
22 be8b315d 2004-06-17 devnull chal = (buf[0]<<24)+(buf[1]<<16)+(buf[2]<<8)+buf[3];
23 be8b315d 2004-06-17 devnull sprint(answer, "%.8lux", chal);
26 be8b315d 2004-06-17 devnull AuthInfo*
27 be8b315d 2004-06-17 devnull auth_userpasswd(char *user, char *passwd)
29 be8b315d 2004-06-17 devnull char key[DESKEYLEN], resp[16];
30 be8b315d 2004-06-17 devnull AuthInfo *ai;
31 be8b315d 2004-06-17 devnull Chalstate *ch;
34 be8b315d 2004-06-17 devnull * Probably we should have a factotum protocol
35 be8b315d 2004-06-17 devnull * to check a raw password. For now, we use
36 be8b315d 2004-06-17 devnull * p9cr, which is simplest to speak.
38 be8b315d 2004-06-17 devnull if((ch = auth_challenge("user=%q proto=p9cr role=server", user)) == nil)
39 be8b315d 2004-06-17 devnull return nil;
41 be8b315d 2004-06-17 devnull passtokey(key, passwd);
42 be8b315d 2004-06-17 devnull netresp(key, atol(ch->chal), resp);
43 be8b315d 2004-06-17 devnull memset(key, 0, sizeof key);
45 be8b315d 2004-06-17 devnull ch->resp = resp;
46 be8b315d 2004-06-17 devnull ch->nresp = strlen(resp);
47 be8b315d 2004-06-17 devnull ai = auth_response(ch);
48 be8b315d 2004-06-17 devnull auth_freechal(ch);
49 be8b315d 2004-06-17 devnull return ai;