From 0f8ec41b0ae522b73085fa1662461e6351ba7e54 Mon Sep 17 00:00:00 2001
From: rsc <devnull@localhost>
Date: Sun, 13 Feb 2005 05:58:45 +0000
Subject: moving to auth

---
 src/cmd/factotum/p9cr.c | 545 ------------------------------------------------
 1 file changed, 545 deletions(-)
 delete mode 100644 src/cmd/factotum/p9cr.c

(limited to 'src/cmd/factotum/p9cr.c')

diff --git a/src/cmd/factotum/p9cr.c b/src/cmd/factotum/p9cr.c
deleted file mode 100644
index 7f53e447..00000000
--- a/src/cmd/factotum/p9cr.c
+++ /dev/null
@@ -1,545 +0,0 @@
-/*
- * p9cr, vnc - one-sided challenge/response authentication
- *
- * Protocol:
- *
- *	C -> S: user
- *	S -> C: challenge
- *	C -> S: response
- *	S -> C: ok or bad
- *
- * Note that this is the protocol between factotum and the local
- * program, not between the two factotums.  The information 
- * exchanged here is wrapped in other protocols by the local
- * programs.
- */
-
-#include "std.h"
-#include "dat.h"
-
-static int
-p9crcheck(Key *k)
-{
-	if(!strfindattr(k->attr, "user") || !strfindattr(k->privattr, "!password")){
-		werrstr("need user and !password attributes");
-		return -1;
-	}
-	return 0;
-}
-
-static int
-p9crclient(Conv *c)
-{
-	char *chal, *pw, *res, *user;
-	int astype, nchal, npw, ntry, ret;
-	uchar resp[MD5dlen];
-	Attr *attr;
-	DigestState *ds;
-	Key *k;
-	
-	chal = nil;
-	k = nil;
-	res = nil;
-	ret = -1;
-	attr = c->attr;
-
-	if(c->proto == &p9cr){
-		astype = AuthChal;
-		challen = NETCHLEN;
-	}else if(c->proto == &vnc){
-		astype = AuthVnc;
-		challen = MAXCHAL;
-	}else{
-		werrstr("bad proto");
-		goto out;
-	}
-
-	c->state = "find key";
-	k = keyfetch(c, "%A %s", attr, c->proto->keyprompt);
-	if(k == nil)
-		goto out;
-
-	for(ntry=1;; ntry++){
-		if(c->attr != attr)
-			freeattr(c->attr);
-		c->attr = addattrs(copyattr(attr), k->attr);
-		if((pw = strfindattr(k->privattr, "!password")) == nil){
-			werrstr("key has no !password (cannot happen)");
-			goto out;
-		}
-		npw = strlen(pw);
-
-		if((user = strfindattr(k->attr, "user")) == nil){
-			werrstr("key has no user (cannot happen)");
-			goto out;
-		}
-
-		if(convprint(c, "%s", user) < 0)
-			goto out;
-
-		if(convreadm(c, &chal) < 0)
-			goto out;
-
-		if((nresp = (*response)(chal, resp)) < 0)
-			goto out;
-
-		if(convwrite(c, resp, nresp) < 0)
-			goto out;
-
-		if(convreadm(c, &res) < 0)
-			goto out;
-
-		if(strcmp(res, "ok") == 0)
-			break;
-
-		if((k = keyreplace(c, k, "%s", res)) == nil){
-			c->state = "auth failed";
-			werrstr("%s", res);
-			goto out;
-		}
-	}
-
-	werrstr("succeeded");
-	ret = 0;
-
-out:
-	keyclose(k);
-	free(chal);
-	if(c->attr != attr)
-		freeattr(attr);
-	return ret;
-}
-
-static int
-p9crserver(Conv *c)
-{
-	char chal[APOPCHALLEN], *user, *resp;
-	ServerState s;
-	int astype, ret;
-	Attr *a;
-
-	ret = -1;
-	user = nil;
-	resp = nil;
-	memset(&s, 0, sizeof s);
-	s.asfd = -1;
-
-	if(c->proto == &apop)
-		astype = AuthApop;
-	else if(c->proto == &cram)
-		astype = AuthCram;
-	else{
-		werrstr("bad proto");
-		goto out;
-	}
-
-	c->state = "find key";
-	if((s.k = plan9authkey(c->attr)) == nil)
-		goto out;
-
-	a = copyattr(s.k->attr);
-	a = delattr(a, "proto");
-	c->attr = addattrs(c->attr, a);
-	freeattr(a);
-
-	c->state = "authdial";
-	s.hostid = strfindattr(s.k->attr, "user");
-	s.dom = strfindattr(s.k->attr, "dom");
-	if((s.asfd = xioauthdial(nil, s.dom)) < 0){
-		werrstr("authdial %s: %r", s.dom);
-		goto out;
-	}
-
-	c->state = "authchal";
-	if(p9crchal(&s, astype, chal) < 0)
-		goto out;
-
-	c->state = "write challenge";
-	if(convprint(c, "%s", chal) < 0)
-		goto out;
-
-	for(;;){
-		c->state = "read user";
-		if(convreadm(c, &user) < 0)
-			goto out;
-
-		c->state = "read response";
-		if(convreadm(c, &resp) < 0)
-			goto out;
-
-		c->state = "authwrite";
-		switch(apopresp(&s, user, resp)){
-		case -1:
-			goto out;
-		case 0:
-			c->state = "write status";
-			if(convprint(c, "bad authentication failed") < 0)
-				goto out;
-			break;
-		case 1:
-			c->state = "write status";
-			if(convprint(c, "ok") < 0)
-				goto out;
-			goto ok;
-		}
-		free(user);
-		free(resp);
-		user = nil;
-		resp = nil;
-	}
-
-ok:
-	ret = 0;
-	c->attr = addcap(c->attr, c->sysuser, &s.t);
-
-out:
-	keyclose(s.k);
-	free(user);
-	free(resp);
-//	xioclose(s.asfd);
-	return ret;
-}
-
-enum
-{
-	MAXCHAL = 64,
-};
-
-typedef struct State State;
-struct State
-{
-	Key	*key;
-	int	astype;
-	int	asfd;
-	Ticket	t;
-	Ticketreq tr;
-	char	chal[MAXCHAL];
-	int	challen;
-	char	resp[MAXCHAL];
-	int	resplen;
-};
-
-enum
-{
-	CNeedChal,
-	CHaveResp,
-
-	SHaveChal,
-	SNeedResp,
-
-	Maxphase,
-};
-
-static char *phasenames[Maxphase] =
-{
-[CNeedChal]	"CNeedChal",
-[CHaveResp]	"CHaveResp",
-
-[SHaveChal]	"SHaveChal",
-[SNeedResp]	"SNeedResp",
-};
-
-static void
-p9crclose(Fsstate *fss)
-{
-	State *s;
-
-	s = fss->ps;
-	if(s->asfd >= 0){
-		close(s->asfd);
-		s->asfd = -1;
-	}
-	free(s);
-}
-
-static int getchal(State*, Fsstate*);
-
-static int
-p9crinit(Proto *p, Fsstate *fss)
-{
-	int iscli, ret;
-	char *user;
-	State *s;
-	Attr *attr;
-
-	if((iscli = isclient(_str_findattr(fss->attr, "role"))) < 0)
-		return failure(fss, nil);
-	
-	s = emalloc(sizeof(*s));
-	s->asfd = -1;
-	if(p == &p9cr){
-		s->astype = AuthChal;
-		s->challen = NETCHLEN;
-	}else if(p == &vnc){
-		s->astype = AuthVNC;
-		s->challen = Maxchal;
-	}else
-		abort();
-
-	if(iscli){
-		fss->phase = CNeedChal;
-		if(p == &p9cr)
-			attr = setattr(_copyattr(fss->attr), "proto=p9sk1");
-		else
-			attr = nil;
-		ret = findkey(&s->key, fss, Kuser, 0, attr ? attr : fss->attr,
-			"role=client %s", p->keyprompt);
-		_freeattr(attr);
-		if(ret != RpcOk){
-			free(s);
-			return ret;
-		}
-		fss->ps = s;
-	}else{
-		if((ret = findp9authkey(&s->key, fss)) != RpcOk){
-			free(s);
-			return ret;
-		}
-		if((user = _str_findattr(fss->attr, "user")) == nil){
-			free(s);
-			return failure(fss, "no user name specified in start msg");
-		}
-		if(strlen(user) >= sizeof s->tr.uid){
-			free(s);
-			return failure(fss, "user name too long");
-		}
-		fss->ps = s;
-		strcpy(s->tr.uid, user);
-		ret = getchal(s, fss);
-		if(ret != RpcOk){
-			p9crclose(fss);	/* frees s */
-			fss->ps = nil;
-		}
-	}
-	fss->phasename = phasenames;
-	fss->maxphase = Maxphase;
-	return ret;
-}
-
-static int
-p9crread(Fsstate *fss, void *va, uint *n)
-{
-	int m;
-	State *s;
-
-	s = fss->ps;
-	switch(fss->phase){
-	default:
-		return phaseerror(fss, "read");
-
-	case CHaveResp:
-		if(s->resplen < *n)
-			*n = s->resplen;
-		memmove(va, s->resp, *n);
-		fss->phase = Established;
-		return RpcOk;
-
-	case SHaveChal:
-		if(s->astype == AuthChal)
-			m = strlen(s->chal);	/* ascii string */
-		else
-			m = s->challen;		/* fixed length binary */
-		if(m > *n)
-			return toosmall(fss, m);
-		*n = m;
-		memmove(va, s->chal, m);
-		fss->phase = SNeedResp;
-		return RpcOk;
-	}
-}
-
-static int
-p9response(Fsstate *fss, State *s)
-{
-	char key[DESKEYLEN];
-	uchar buf[8];
-	ulong chal;
-	char *pw;
-
-	pw = _str_findattr(s->key->privattr, "!password");
-	if(pw == nil)
-		return failure(fss, "vncresponse cannot happen");
-	passtokey(key, pw);
-	memset(buf, 0, 8);
-	sprint((char*)buf, "%d", atoi(s->chal));
-	if(encrypt(key, buf, 8) < 0)
-		return failure(fss, "can't encrypt response");
-	chal = (buf[0]<<24)+(buf[1]<<16)+(buf[2]<<8)+buf[3];
-	s->resplen = snprint(s->resp, sizeof s->resp, "%.8lux", chal);
-	return RpcOk;
-}
-
-static uchar tab[256];
-
-/* VNC reverses the bits of each byte before using as a des key */
-static void
-mktab(void)
-{
-	int i, j, k;
-	static int once;
-
-	if(once)
-		return;
-	once = 1;
-
-	for(i=0; i<256; i++) {
-		j=i;
-		tab[i] = 0;
-		for(k=0; k<8; k++) {
-			tab[i] = (tab[i]<<1) | (j&1);
-			j >>= 1;
-		}
-	}
-}
-
-static int
-vncaddkey(Key *k)
-{
-	uchar *p;
-	char *s;
-
-	k->priv = emalloc(8+1);
-	if(s = _str_findattr(k->privattr, "!password")){
-		mktab();
-		memset(k->priv, 0, 8+1);
-		strncpy((char*)k->priv, s, 8);
-		for(p=k->priv; *p; p++)
-			*p = tab[*p];
-	}else{
-		werrstr("no key data");
-		return -1;
-	}
-	return replacekey(k);
-}
-
-static void
-vncclosekey(Key *k)
-{
-	free(k->priv);
-}
-
-static int
-vncresponse(Fsstate*, State *s)
-{
-	DESstate des;
-
-	memmove(s->resp, s->chal, sizeof s->chal);
-	setupDESstate(&des, s->key->priv, nil);
-	desECBencrypt((uchar*)s->resp, s->challen, &des);
-	s->resplen = s->challen;
-	return RpcOk;
-}
-
-static int
-p9crwrite(Fsstate *fss, void *va, uint n)
-{
-	char tbuf[TICKETLEN+AUTHENTLEN];
-	State *s;
-	char *data = va;
-	Authenticator a;
-	char resp[Maxchal];
-	int ret;
-
-	s = fss->ps;
-	switch(fss->phase){
-	default:
-		return phaseerror(fss, "write");
-
-	case CNeedChal:
-		if(n >= sizeof(s->chal))
-			return failure(fss, Ebadarg);
-		memset(s->chal, 0, sizeof s->chal);
-		memmove(s->chal, data, n);
-		s->challen = n;
-
-		if(s->astype == AuthChal)
-			ret = p9response(fss, s);
-		else
-			ret = vncresponse(fss, s);
-		if(ret != RpcOk)
-			return ret;
-		fss->phase = CHaveResp;
-		return RpcOk;
-
-	case SNeedResp:
-		/* send response to auth server and get ticket */
-		if(n > sizeof(resp))
-			return failure(fss, Ebadarg);
-		memset(resp, 0, sizeof resp);
-		memmove(resp, data, n);
-		if(write(s->asfd, resp, s->challen) != s->challen)
-			return failure(fss, Easproto);
-
-		/* get ticket plus authenticator from auth server */
-		if(_asrdresp(s->asfd, tbuf, TICKETLEN+AUTHENTLEN) < 0)
-			return failure(fss, nil);
-
-		/* check ticket */
-		convM2T(tbuf, &s->t, s->key->priv);
-		if(s->t.num != AuthTs
-		|| memcmp(s->t.chal, s->tr.chal, sizeof(s->t.chal)) != 0)
-			return failure(fss, Easproto);
-		convM2A(tbuf+TICKETLEN, &a, s->t.key);
-		if(a.num != AuthAc
-		|| memcmp(a.chal, s->tr.chal, sizeof(a.chal)) != 0
-		|| a.id != 0)
-			return failure(fss, Easproto);
-
-		fss->haveai = 1;
-		fss->ai.cuid = s->t.cuid;
-		fss->ai.suid = s->t.suid;
-		fss->ai.nsecret = 0;
-		fss->ai.secret = nil;
-		fss->phase = Established;
-		return RpcOk;
-	}
-}
-
-static int
-getchal(State *s, Fsstate *fss)
-{
-	char trbuf[TICKREQLEN];
-	int n;
-
-	safecpy(s->tr.hostid, _str_findattr(s->key->attr, "user"), sizeof(s->tr.hostid));
-	safecpy(s->tr.authdom, _str_findattr(s->key->attr, "dom"), sizeof(s->tr.authdom));
-	s->tr.type = s->astype;
-	convTR2M(&s->tr, trbuf);
-
-	/* get challenge from auth server */
-	s->asfd = _authdial(nil, _str_findattr(s->key->attr, "dom"));
-	if(s->asfd < 0)
-		return failure(fss, Easproto);
-	if(write(s->asfd, trbuf, TICKREQLEN) != TICKREQLEN)
-		return failure(fss, Easproto);
-	n = _asrdresp(s->asfd, s->chal, s->challen);
-	if(n <= 0){
-		if(n == 0)
-			werrstr("_asrdresp short read");
-		return failure(fss, nil);
-	}
-	s->challen = n;
-	fss->phase = SHaveChal;
-	return RpcOk;
-}
-
-Proto p9cr =
-{
-.name=		"p9cr",
-.init=		p9crinit,
-.write=		p9crwrite,
-.read=		p9crread,
-.close=		p9crclose,
-.keyprompt=	"user? !password?",
-};
-
-Proto vnc =
-{
-.name=		"vnc",
-.init=		p9crinit,
-.write=		p9crwrite,
-.read=		p9crread,
-.close=		p9crclose,
-.keyprompt=	"!password?",
-.addkey=	vncaddkey,
-};
-- 
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