#include <u.h>#include <libc.h>#include <auth.h>#include "authlocal.h" static char *abmsg = "/dev/authenticate: %r";static char *badreq = "bad ticket request";static char *ccmsg = "can't connect to AS"; intlogin(char *user, char *password, char *namespace){	int fd, afd, rv;	char trbuf[TICKREQLEN];	char tbuf[2*TICKETLEN+AUTHENTLEN];	char key[DESKEYLEN];	Ticketreq tr;	Ticket t;	Authenticator a; 	/* get ticket request from kernel */	afd = open("/dev/authenticate", ORDWR);	if(afd < 0){		werrstr(abmsg);		return -1;	}	rv = read(afd, trbuf, TICKREQLEN);	if(rv != TICKREQLEN){		close(afd);		werrstr(abmsg);		return -1;	} 	/* add in user and host id */	convM2TR(trbuf, &tr);	if(tr.type != AuthTreq){		werrstr(badreq);		return -1;	}	memset(tr.uid, 0, sizeof(tr.uid));	strcpy(tr.uid, user);	memset(tr.hostid, 0, sizeof(tr.hostid));	strcpy(tr.hostid, user);	convTR2M(&tr, trbuf); 	/* pass to auth server for ticket ticket */	fd = authdial();	if(fd < 0){		close(afd);		werrstr(ccmsg);		return -1;	}	rv = _asgetticket(fd, trbuf, tbuf);	close(fd);	if(rv < 0){		close(afd);		werrstr("getticket: %r");		return -1;	} 	/* crack ticket for nonce key */	passtokey(key, password);	convM2T(tbuf, &t, key);	if(t.num != AuthTc){		close(afd);		werrstr("login failed");		return -1;	}			/* create an authenticator and pass to kernel */	a.num = AuthAc;	memmove(a.chal, t.chal, CHALLEN);	a.id = 0;	convA2M(&a, tbuf+2*TICKETLEN, t.key);	rv = write(afd, tbuf+TICKETLEN, TICKETLEN+AUTHENTLEN);	close(afd);	if(rv < 0)		return -1; 	/* set up namespace */	newns(user, namespace);	return 0;}