Subversion Repositories planix.SVN

#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, sizeof buf);

	snprint((char *)buf, sizeof buf, "%lud", chal);

	if(encrypt(key, buf, 8) < 0)

		abort();

	sprint(answer, "%.8ux", buf[0]<<24 | buf[1]<<16 | buf[2]<<8 | buf[3]);

}

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;

}