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"
 6 be8b315d 2004-06-17 devnull 
 7 be8b315d 2004-06-17 devnull /*
 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.
12 be8b315d 2004-06-17 devnull  */
13 be8b315d 2004-06-17 devnull static void
14 be8b315d 2004-06-17 devnull netresp(char *key, long chal, char *answer)
15 be8b315d 2004-06-17 devnull {
16 be8b315d 2004-06-17 devnull 	uchar buf[8];
17 be8b315d 2004-06-17 devnull 
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)
21 be8b315d 2004-06-17 devnull 		abort();
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);
24 be8b315d 2004-06-17 devnull }
25 be8b315d 2004-06-17 devnull 
26 be8b315d 2004-06-17 devnull AuthInfo*
27 be8b315d 2004-06-17 devnull auth_userpasswd(char *user, char *passwd)
28 be8b315d 2004-06-17 devnull {
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;
32 be8b315d 2004-06-17 devnull 
33 be8b315d 2004-06-17 devnull 	/*
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.
37 be8b315d 2004-06-17 devnull 	 */
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;
40 be8b315d 2004-06-17 devnull 
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);
44 be8b315d 2004-06-17 devnull 
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;
50 be8b315d 2004-06-17 devnull }