--- /sys/man/8/wpa
+++ /sys/man/8/wpa
@@ -0,0 +1,72 @@
+.TH WPA 8
+.SH NAME
+wpa \- Wi-Fi Protected Access setup
+.SH SYNOPSIS
+.B aux/wpa
+[
+.B -dp12
+] [
+.B -s
+.I essid
+]
+.I dev
+.SH DESCRIPTION
+.I Wpa
+handles the authentication and key exchange with WPA
+protected wireless networks.
+.PP
+The
+.I dev
+parameter specifies the network interface that needs
+to be setup with WPA.
+The
+.I essid
+can be set with the
+.I -s
+option. Otherwise, the previously configured essid
+on the interface will be used.
+The
+.B -p
+option will prompt and install the preshared key or
+pap/chap credentials into factotum, otherwise the key has to be
+already present in factotum or an interactive key prompter like
+auth/fgui (see
+.IR factotum (4))
+needs to provide it.
+.PP
+The authentication protocol is initiated by the
+wireless access point so
+.I wpa
+will background itself after the keyprompt and establish
+the encryption automatically as needed.
+The optional
+.B -1
+or
+.B -2
+arguments can be used to select between WPA1/TKIP
+(default) or WPA2/CCMP encryption with WPA PSK.
+.PP
+The
+.B -d
+option enables debugging and causes
+.I wpa
+to stay in foreground writing protocol messages to
+standard error.
+.SH EXAMPLES
+Setup wireless encryption:
+.EX
+% bind -a '#l1' /net
+% aux/wpa -s 9HAL -p /net/ether1
+!Adding key: proto=wpapsk essid=9HAL
+password: *****
+!
+% ip/ipconfig ether /net/ether1
+.EE
+.SH SOURCE
+.B /sys/src/cmd/aux/wpa.c
+.SH SEE ALSO
+.IR factotum (4),
+.IR ipconfig (8)
+.SH HISTORY
+.I Wpa
+first appeared in 9front (March, 2013).
--- /n/sources/plan9/sys/src/cmd/aux/mkfile	Thu Aug 16 22:50:45 2012
+++ /sys/src/cmd/aux/mkfile
@@ -35,6 +35,7 @@
 	trampoline\
 	usage\
 	watchdog\
+	wpa\
 	write\
 	zerotrunc\
 
--- /sys/src/cmd/aux/wpa.c
+++ /sys/src/cmd/aux/wpa.c
@@ -0,0 +1,1523 @@
+#include <u.h>
+#include <libc.h>
+#include <ip.h>
+#include <mp.h>
+#include <libsec.h>
+#include <auth.h>
+
+enum {
+	PMKlen = 256/8,
+	PTKlen = 512/8,
+	GTKlen = 256/8,
+
+	MIClen = 16,
+
+	Noncelen = 32,
+	Eaddrlen = 6,
+};
+
+enum {
+	Fptk	= 1<<3,
+	Fins	= 1<<6,
+	Fack	= 1<<7,
+	Fmic	= 1<<8,
+	Fsec	= 1<<9,
+	Ferr	= 1<<10,
+	Freq	= 1<<11,
+	Fenc	= 1<<12,
+
+	Keydescrlen = 1+2+2+8+32+16+8+8+16+2,
+};
+
+typedef struct Keydescr Keydescr;
+struct Keydescr
+{
+	uchar	type[1];
+	uchar	flags[2];
+	uchar	keylen[2];
+	uchar	repc[8];
+	uchar	nonce[32];
+	uchar	eapoliv[16];
+	uchar	rsc[8];
+	uchar	id[8];
+	uchar	mic[16];
+	uchar	datalen[2];
+	uchar	data[];
+};
+
+typedef struct Cipher Cipher;
+struct Cipher
+{
+	char	*name;
+	int	keylen;
+};
+
+typedef struct Eapconn Eapconn;
+typedef struct TLStunn TLStunn;
+
+struct Eapconn
+{
+	int	fd;
+	int	version;
+
+	uchar	type;
+	uchar	smac[Eaddrlen];
+	uchar	amac[Eaddrlen];
+
+	TLStunn	*tunn;
+
+	void	(*write)(Eapconn*, uchar *data, int datalen);
+};
+
+struct TLStunn
+{
+	int	fd;
+
+	int	clientpid;
+	int	readerpid;
+
+	uchar	id;
+	uchar	tp;
+};
+
+Cipher	tkip = { "tkip", 32 };
+Cipher	ccmp = { "ccmp", 16 };
+
+Cipher	*peercipher;
+Cipher	*groupcipher;
+
+int	forked;
+int	prompt;
+int	debug;
+int	fd, cfd;
+char	*dev;
+enum {
+	AuthNone,
+	AuthPSK,
+	AuthWPA,
+};
+int	authtype;
+char	devdir[40];
+uchar	ptk[PTKlen];
+char	essid[32+1];
+uvlong	lastrepc;
+
+uchar rsntkipoui[4] = {0x00, 0x0F, 0xAC, 0x02};
+uchar rsnccmpoui[4] = {0x00, 0x0F, 0xAC, 0x04};
+uchar rsnapskoui[4] = {0x00, 0x0F, 0xAC, 0x02};
+uchar rsnawpaoui[4] = {0x00, 0x0F, 0xAC, 0x01};
+
+uchar	rsnie[] = {
+	0x30,			/* RSN */
+	0x14,			/* length */
+	0x01, 0x00,		/* version 1 */
+	0x00, 0x0F, 0xAC, 0x04,	/* group cipher suite CCMP */
+	0x01, 0x00,		/* pairwise cipher suite count 1 */
+	0x00, 0x0F, 0xAC, 0x04,	/* pairwise cipher suite CCMP */
+	0x01, 0x00,		/* authentication suite count 1 */
+	0x00, 0x0F, 0xAC, 0x02,	/* authentication suite PSK */
+	0x00, 0x00,		/* capabilities */
+};
+
+uchar wpa1oui[4]    = {0x00, 0x50, 0xF2, 0x01};
+uchar wpatkipoui[4] = {0x00, 0x50, 0xF2, 0x02};
+uchar wpaapskoui[4] = {0x00, 0x50, 0xF2, 0x02};
+uchar wpaawpaoui[4] = {0x00, 0x50, 0xF2, 0x01};
+
+uchar	wpaie[] = {
+	0xdd,			/* vendor specific */
+	0x16,			/* length */
+	0x00, 0x50, 0xf2, 0x01,	/* WPAIE type 1 */
+	0x01, 0x00,		/* version 1 */
+	0x00, 0x50, 0xf2, 0x02,	/* group cipher suite TKIP */
+	0x01, 0x00,		/* pairwise cipher suite count 1 */
+	0x00, 0x50, 0xf2, 0x02,	/* pairwise cipher suite TKIP */
+	0x01, 0x00,		/* authentication suite count 1 */
+	0x00, 0x50, 0xf2, 0x02,	/* authentication suite PSK */
+};
+
+void*
+emalloc(int len)
+{
+	void *v;
+
+	if((v = mallocz(len, 1)) == nil)
+		sysfatal("malloc: %r");
+	return v;
+}
+
+int
+hextob(char *s, char **sp, uchar *b, int n)
+{
+	int r;
+
+	n <<= 1;
+	for(r = 0; r < n && *s; s++){
+		*b <<= 4;
+		if(*s >= '0' && *s <= '9')
+			*b |= (*s - '0');
+		else if(*s >= 'a' && *s <= 'f')
+			*b |= 10+(*s - 'a');
+		else if(*s >= 'A' && *s <= 'F')
+			*b |= 10+(*s - 'A');
+		else break;
+		if((++r & 1) == 0)
+			b++;
+	}
+	if(sp != nil)
+		*sp = s;
+	return r >> 1;
+}
+
+char*
+getifstats(char *key, char *val, int nval)
+{
+	char buf[8*1024], *f[2], *p, *e;
+	int fd, n;
+
+	snprint(buf, sizeof(buf), "%s/ifstats", devdir);
+	if((fd = open(buf, OREAD)) < 0)
+		return nil;
+	n = readn(fd, buf, sizeof(buf)-1);
+	close(fd);
+	if(n <= 0)
+		return nil;
+	buf[n] = 0;
+	for(p = buf; (e = strchr(p, '\n')) != nil; p = e){
+		*e++ = 0;
+		if(gettokens(p, f, 2, "\t\r\n ") != 2)
+			continue;
+		if(strcmp(f[0], key) != 0)
+			continue;
+		strncpy(val, f[1], nval);
+		val[nval-1] = 0;
+		return val;
+	}
+	return nil;
+}
+
+char*
+getessid(void)
+{
+	return getifstats("essid:", essid, sizeof(essid));
+}
+
+int
+getbssid(uchar mac[Eaddrlen])
+{
+	char buf[64];
+
+	if(getifstats("bssid:", buf, sizeof(buf)) != nil)
+		return parseether(mac, buf);
+	return -1;
+}
+
+int
+connected(void)
+{
+	char status[1024];
+
+	if(getifstats("status:", status, sizeof(status)) == nil)
+		return 0;
+	if(strcmp(status, "connecting") == 0)
+		return 0;
+	if(strcmp(status, "unauthenticated") == 0)
+		return 0;
+	if(debug)
+		fprint(2, "status: %s\n", status);
+	return 1;
+}
+
+int
+buildrsne(uchar rsne[258])
+{
+	char buf[1024];
+	uchar brsne[258];
+	int brsnelen;
+	uchar *p, *w, *e;
+	int i, n;
+
+	if(getifstats("brsne:", buf, sizeof(buf)) == nil)
+		return 0;	/* not an error, might be old kernel */
+
+	brsnelen = hextob(buf, nil, brsne, sizeof(brsne));
+	if(brsnelen <= 4){
+trunc:		sysfatal("invalid or truncated RSNE; brsne: %s", buf);
+		return 0;
+	}
+
+	w = rsne;
+	p = brsne;
+	e = p + brsnelen;
+	if(p[0] == 0x30){
+		p += 2;
+
+		/* RSN */
+		*w++ = 0x30;
+		*w++ = 0;	/* length */
+	} else if(p[0] == 0xDD){
+		p += 2;
+		if((e - p) < 4 || memcmp(p, wpa1oui, 4) != 0){
+			sysfatal("unrecognized WPAIE type; brsne: %s", buf);
+			return 0;
+		}
+
+		/* WPA */
+		*w++ = 0xDD;
+		*w++ = 0;	/* length */
+
+		memmove(w, wpa1oui, 4);
+		w += 4;
+		p += 4;
+	} else {
+		sysfatal("unrecognized RSNE type; brsne: %s", buf);
+		return 0;
+	}
+
+	if((e - p) < 6)
+		goto trunc;
+
+	*w++ = *p++;		/* version */
+	*w++ = *p++;
+
+	if(rsne[0] == 0x30){
+		if(memcmp(p, rsnccmpoui, 4) == 0)
+			groupcipher = &ccmp;
+		else if(memcmp(p, rsntkipoui, 4) == 0)
+			groupcipher = &tkip;
+		else {
+			sysfatal("unrecognized RSN group cipher; brsne: %s", buf);
+			return 0;
+		}
+	} else {
+		if(memcmp(p, wpatkipoui, 4) != 0){
+			sysfatal("unrecognized WPA group cipher; brsne: %s", buf);
+			return 0;
+		}
+		groupcipher = &tkip;
+	}
+
+	memmove(w, p, 4);	/* group cipher */
+	w += 4;
+	p += 4;
+
+	if((e - p) < 6)
+		goto trunc;
+
+	*w++ = 0x01;		/* # of peer ciphers */
+	*w++ = 0x00;
+	n = *p++;
+	n |= *p++ << 8;
+
+	if(n <= 0)
+		goto trunc;
+
+	peercipher = &tkip;
+	for(i=0; i<n; i++){
+		if((e - p) < 4)
+			goto trunc;
+
+		if(rsne[0] == 0x30 && memcmp(p, rsnccmpoui, 4) == 0 && peercipher == &tkip)
+			peercipher = &ccmp;
+		p += 4;
+	}
+	if(peercipher == &ccmp)
+		memmove(w, rsnccmpoui, 4);
+	else if(rsne[0] == 0x30)
+		memmove(w, rsntkipoui, 4);
+	else
+		memmove(w, wpatkipoui, 4);
+	w += 4;
+
+	if((e - p) < 6)
+		goto trunc;
+
+	*w++ = 0x01;		/* # of auth suites */
+	*w++ = 0x00;
+	n = *p++;
+	n |= *p++ << 8;
+
+	if(n <= 0)
+		goto trunc;
+
+	for(i=0; i<n; i++){
+		if((e - p) < 4)
+			goto trunc;
+
+		if(rsne[0] == 0x30){
+			/* look for PSK oui */
+			if(memcmp(p, rsnapskoui, 4) == 0)
+				break;
+			/* look for WPA oui */
+			if(memcmp(p, rsnawpaoui, 4) == 0){
+				authtype = AuthWPA;
+				break;
+			}
+		} else {
+			/* look for PSK oui */
+			if(memcmp(p, wpaapskoui, 4) == 0)
+				break;
+			/* look for WPA oui */
+			if(memcmp(p, wpaawpaoui, 4) == 0){
+				authtype = AuthWPA;
+				break;
+			}
+		}
+		p += 4;
+	}
+	if(i >= n){
+		sysfatal("auth suite is not PSK or WPA; brsne: %s", buf);
+		return 0;
+	}
+
+	memmove(w, p, 4);
+	w += 4;
+
+	if(rsne[0] == 0x30){
+		/* RSN caps */
+		*w++ = 0x00;
+		*w++ = 0x00;
+	}
+
+	rsne[1] = (w - rsne) - 2;
+	return w - rsne;
+}
+
+char*
+factotumattr(char *attr, char *fmt, ...)
+{
+	char buf[1024];
+	va_list list;
+	AuthRpc *rpc;
+	char *val;
+	Attr *a;
+	int afd;
+
+	if((afd = open("/mnt/factotum/rpc", ORDWR)) < 0)
+		return nil;
+	if((rpc = auth_allocrpc(afd)) == nil){
+		close(afd);
+		return nil;
+	}
+	va_start(list, fmt);
+	vsnprint(buf, sizeof(buf), fmt, list);
+	va_end(list);
+	val = nil;
+	if(auth_rpc(rpc, "start", buf, strlen(buf)) == 0){
+		if((a = auth_attr(rpc)) != nil){
+			if((val = _strfindattr(a, attr)) != nil)
+				val = strdup(val);
+			_freeattr(a);
+		}
+	}
+	auth_freerpc(rpc);
+	close(afd);
+
+	return val;
+}
+
+void
+freeup(UserPasswd *up)
+{
+	memset(up->user, 0, strlen(up->user));
+	memset(up->passwd, 0, strlen(up->passwd));
+	free(up);
+}
+
+char*
+getidentity(void)
+{
+	static char *identity;
+	char *s;
+
+	s = nil;
+	for(;;){
+		if(getessid() == nil)
+			break;
+		if((s = factotumattr("user", "proto=pass service=wpa essid=%q", essid)) != nil)
+			break;
+		if((s = factotumattr("user", "proto=mschapv2 role=client service=wpa essid=%q", essid)) != nil)
+			break;
+		break;
+	}
+	if(s != nil){
+		free(identity);
+		identity = s;
+	} else if(identity == nil)
+		identity = strdup("anonymous");
+	if(debug)
+		fprint(2, "identity: %s\n", identity);
+	return identity;
+}
+
+int
+factotumctl(char *fmt, ...)
+{
+	va_list list;
+	int fd, r, n;
+	char *s;
+
+	r = -1;
+	if((fd = open("/mnt/factotum/ctl", OWRITE)) >= 0){
+		va_start(list, fmt);
+		s = vsmprint(fmt, list);
+		va_end(list);
+		if(s != nil){
+			n = strlen(s);
+			r = write(fd, s, n);
+			memset(s, 0, n);
+			free(s);
+		}
+		close(fd);
+	}
+	return r;
+}
+
+int
+setpmk(uchar pmk[PMKlen])
+{
+	if(getessid() == nil)
+		return -1;
+	return factotumctl("key proto=wpapsk role=client essid=%q !password=%.*H\n", essid, PMKlen, pmk);
+}
+
+int
+getptk(AuthGetkey *getkey,
+	uchar smac[Eaddrlen], uchar amac[Eaddrlen], 
+	uchar snonce[Noncelen],  uchar anonce[Noncelen], 
+	uchar ptk[PTKlen])
+{
+	uchar buf[2*Eaddrlen + 2*Noncelen], *p;
+	AuthRpc *rpc;
+	int afd, ret;
+	char *s;
+
+	ret = -1;
+	s = nil;
+	rpc = nil;
+	if((afd = open("/mnt/factotum/rpc", ORDWR)) < 0)
+		goto out;
+	if((rpc = auth_allocrpc(afd)) == nil)
+		goto out;
+	if((s = getessid()) == nil)
+		goto out;
+	if((s = smprint("proto=wpapsk role=client essid=%q", s)) == nil)
+		goto out;
+	if((ret = auth_rpc(rpc, "start", s, strlen(s))) != ARok)
+		goto out;
+	p = buf;
+	memmove(p, smac, Eaddrlen); p += Eaddrlen;
+	memmove(p, amac, Eaddrlen); p += Eaddrlen;
+	memmove(p, snonce, Noncelen); p += Noncelen;
+	memmove(p, anonce, Noncelen); p += Noncelen;
+	if((ret = auth_rpc(rpc, "write", buf, p - buf)) != ARok)
+		goto out;
+	if((ret = auth_rpc(rpc, "read", nil, 0)) != ARok)
+		goto out;
+	if(rpc->narg != PTKlen){
+		ret = -1;
+		goto out;
+	}
+	memmove(ptk, rpc->arg, PTKlen);
+	ret = 0;
+out:
+	if(getkey != nil){
+		switch(ret){
+		case ARneedkey:
+		case ARbadkey:
+			(*getkey)(rpc->arg);
+			break;
+		}
+	}
+	free(s);
+	if(afd >= 0) close(afd);
+	if(rpc != nil) auth_freerpc(rpc);
+	return ret;
+}
+
+void
+dumpkeydescr(Keydescr *kd)
+{
+	static struct {
+		int	flag;
+		char	*name;
+	} flags[] = {
+		Fptk,	"ptk",
+		Fins,	"ins",
+		Fack,	"ack",
+		Fmic,	"mic",
+		Fsec,	"sec",
+		Ferr,	"err",
+		Freq,	"req",
+		Fenc,	"enc",
+	};
+	int i, f;
+
+	f = kd->flags[0]<<8 | kd->flags[1];
+	fprint(2, "type=%.*H vers=%d flags=%.*H ( ",
+		sizeof(kd->type), kd->type, kd->flags[1] & 7,
+		sizeof(kd->flags), kd->flags);
+	for(i=0; i<nelem(flags); i++)
+		if(flags[i].flag & f)
+			fprint(2, "%s ", flags[i].name);
+	fprint(2, ") len=%.*H\nrepc=%.*H nonce=%.*H\neapoliv=%.*H rsc=%.*H id=%.*H mic=%.*H\n",
+		sizeof(kd->keylen), kd->keylen,
+		sizeof(kd->repc), kd->repc,
+		sizeof(kd->nonce), kd->nonce,
+		sizeof(kd->eapoliv), kd->eapoliv,
+		sizeof(kd->rsc), kd->rsc,
+		sizeof(kd->id), kd->id,
+		sizeof(kd->mic), kd->mic);
+	i = kd->datalen[0]<<8 | kd->datalen[1];
+	fprint(2, "data[%.4x]=%.*H\n", i, i, kd->data);
+}
+
+int
+rc4unwrap(uchar key[16], uchar iv[16], uchar *data, int len)
+{
+	uchar seed[32];
+	RC4state rs;
+
+	memmove(seed, iv, 16);
+	memmove(seed+16, key, 16);
+	setupRC4state(&rs, seed, sizeof(seed));
+	rc4skip(&rs, 256);
+	rc4(&rs, data, len);
+	return len;
+}
+
+int
+aesunwrap(uchar *key, int nkey, uchar *data, int len)
+{
+	static uchar IV[8] = { 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, };
+	uchar B[16], *R;
+	AESstate s;
+	uint t;
+	int n;
+
+	len -= 8;
+	if(len < 16 || (len % 8) != 0)
+		return -1;
+	n = len/8;
+	t = n*6;
+	setupAESstate(&s, key, nkey, 0);
+	memmove(B, data, 8);
+	memmove(data, data+8, n*8);
+	do {
+		for(R = data + (n - 1)*8; R >= data; t--, R -= 8){
+			memmove(B+8, R, 8);
+			B[7] ^= (t >> 0);
+			B[6] ^= (t >> 8);
+			B[5] ^= (t >> 16);
+			B[4] ^= (t >> 24);
+			aes_decrypt(s.dkey, s.rounds, B, B);
+			memmove(R, B+8, 8);
+		}
+	} while(t > 0);
+	if(memcmp(B, IV, 8) != 0)
+		return -1;
+	return n*8;
+}
+
+int
+calcmic(Keydescr *kd, uchar *msg, int msglen)
+{
+	int vers;
+
+	vers = kd->flags[1] & 7;
+	memset(kd->mic, 0, MIClen);
+	if(vers == 1){
+		uchar digest[MD5dlen];
+
+		hmac_md5(msg, msglen, ptk, 16, digest, nil);
+		memmove(kd->mic, digest, MIClen);
+		return 0;
+	}
+	if(vers == 2){
+		uchar digest[SHA1dlen];
+
+		hmac_sha1(msg, msglen, ptk, 16, digest, nil);
+		memmove(kd->mic, digest, MIClen);
+		return 0;
+	}
+	return -1;
+}
+
+int
+checkmic(Keydescr *kd, uchar *msg, int msglen)
+{
+	uchar tmp[MIClen];
+
+	memmove(tmp, kd->mic, MIClen);
+	if(calcmic(kd, msg, msglen) != 0)
+		return -1;
+	return memcmp(tmp, kd->mic, MIClen) != 0;
+}
+
+void
+fdwrite(Eapconn *conn, uchar *data, int len)
+{
+	if(write(conn->fd, data, len) != len)
+		sysfatal("write: %r");
+}
+
+void
+etherwrite(Eapconn *conn, uchar *data, int len)
+{
+	uchar *buf, *p;
+	int n;
+
+	if(debug)
+		fprint(2, "\nreply(v%d,t%d) %E -> %E: ", conn->version, conn->type, conn->smac, conn->amac);
+	n = 2*Eaddrlen + 2 + len;
+	if(n < 60) n = 60;	/* ETHERMINTU */
+	p = buf = emalloc(n);
+	/* ethernet header */
+	memmove(p, conn->amac, Eaddrlen); p += Eaddrlen;
+	memmove(p, conn->smac, Eaddrlen); p += Eaddrlen;
+	*p++ = 0x88;
+	*p++ = 0x8e;
+	/* eapol data */
+	memmove(p, data, len);
+	fdwrite(conn, buf, n);
+	free(buf);
+}
+
+void
+eapwrite(Eapconn *conn, uchar *data, int len)
+{
+	uchar *buf, *p;
+
+	p = buf = emalloc(len + 4);
+	/* eapol header */
+	*p++ = conn->version;
+	*p++ = conn->type;
+	*p++ = len >> 8;
+	*p++ = len;
+	/* eap data */
+	memmove(p, data, len); p += len;
+	etherwrite(conn, buf, p - buf);
+	free(buf);
+}
+
+void
+replykey(Eapconn *conn, int flags, Keydescr *kd, uchar *data, int datalen)
+{
+	uchar buf[4096], *p = buf;
+
+	/* eapol hader */
+	*p++ = conn->version;
+	*p++ = conn->type;
+	datalen += Keydescrlen;
+	*p++ = datalen >> 8;
+	*p++ = datalen;
+	datalen -= Keydescrlen;
+	/* key header */
+	memmove(p, kd, Keydescrlen);
+	kd = (Keydescr*)p;
+	kd->flags[0] = flags >> 8;
+	kd->flags[1] = flags;
+	kd->datalen[0] = datalen >> 8;
+	kd->datalen[1] = datalen;
+	/* key data */
+	p = kd->data;
+	memmove(p, data, datalen);
+	p += datalen;
+	/* mic */
+	memset(kd->mic, 0, MIClen);
+	if(flags & Fmic)
+		calcmic(kd, buf, p - buf);
+	etherwrite(conn, buf, p - buf);
+	if(debug)
+		dumpkeydescr(kd);
+}
+
+void
+eapresp(Eapconn *conn, int code, int id, uchar *data, int len)
+{
+	uchar *buf, *p;
+
+	len += 4;
+	p = buf = emalloc(len);
+	/* eap header */
+	*p++ = code;
+	*p++ = id;
+	*p++ = len >> 8;
+	*p++ = len;
+	memmove(p, data, len-4);
+	(*conn->write)(conn, buf, len);
+	free(buf);
+
+	if(debug)
+		fprint(2, "eapresp(code=%d, id=%d, data=%.*H)\n", code, id, len-4, data);
+}
+
+void
+tlsreader(TLStunn *tunn, Eapconn *conn)
+{
+	enum {
+		Tlshdrsz = 5,
+		TLStunnhdrsz = 6,
+	};
+	uchar *rec, *w, *p;
+	int fd, n, css;
+
+	fd = tunn->fd;
+	rec = nil;
+	css = 0;
+Reset:
+	w = rec;
+	w += TLStunnhdrsz;
+	for(;;w += n){
+		if((p = realloc(rec, (w - rec) + Tlshdrsz)) == nil)
+			break;
+		w = p + (w - rec), rec = p;
+		if(readn(fd, w, Tlshdrsz) != Tlshdrsz)
+			break;
+		n = w[3]<<8 | w[4];
+		if(n < 1)
+			break;
+		if((p = realloc(rec, (w - rec) + Tlshdrsz+n)) == nil)
+			break;
+		w = p + (w - rec), rec = p;
+		if(readn(fd, w+Tlshdrsz, n) != n)
+			break;
+		n += Tlshdrsz;	
+		
+		/* batch records that need to be send together */
+		if(!css){
+			/* Client Certificate */
+			if(w[0] == 22 && w[5] == 11)
+				continue;
+			/* Client Key Exchange */
+			if(w[0] == 22 && w[5] == 16)
+				continue;
+			/* Change Cipher Spec */
+			if(w[0] == 20){
+				css = 1;
+				continue;
+			}
+		}
+
+		/* do not forward alert, close connection */
+		if(w[0] == 21)
+			break;
+
+		/* check if we'r still the tunnel for this connection */
+		if(conn->tunn != tunn)
+			break;
+
+		/* flush records in encapsulation */
+		p = rec + TLStunnhdrsz;
+		w += n;
+		n = w - p;
+		*(--p) = n;
+		*(--p) = n >> 8;
+		*(--p) = n >> 16;
+		*(--p) = n >> 24;
+		*(--p) = 0x80;	/* flags: Length included */
+		*(--p) = tunn->tp;
+
+		eapresp(conn, 2, tunn->id, p, w - p);
+		goto Reset;
+	}
+	free(rec);
+}
+
+void ttlsclient(int);
+void peapclient(int);
+
+void
+eapreset(Eapconn *conn)
+{
+	TLStunn *tunn;
+
+	tunn = conn->tunn;
+	if(tunn == nil)
+		return;
+	if(debug)
+		fprint(2, "eapreset: kill client %d\n", tunn->clientpid);
+	conn->tunn = nil;
+	postnote(PNPROC, tunn->clientpid, "kill");
+}
+
+int
+tlswrap(int fd, char *label)
+{
+	TLSconn *tls;
+
+	tls = emalloc(sizeof(TLSconn));
+	if(debug)
+		tls->trace = print;
+	if(label != nil){
+		/* tls client computes the 1024 bit MSK for us */
+		tls->sessionType = "ttls";
+		tls->sessionConst = label;
+		tls->sessionKeylen = 128;
+		tls->sessionKey = emalloc(tls->sessionKeylen);
+	}
+	fd = tlsClient(fd, tls);
+	if(fd < 0)
+		sysfatal("tlsClient: %r");
+	if(label != nil && tls->sessionKey != nil){
+		/*
+		 * PMK is derived from MSK by taking the first 256 bits.
+		 * we store the PMK into factotum with setpmk() associated
+		 * with the current essid.
+		 */
+		if(setpmk(tls->sessionKey) < 0)
+			sysfatal("setpmk: %r");
+
+		/* destroy session key */
+		memset(tls->sessionKey, 0, tls->sessionKeylen);
+	}
+	free(tls->cert);	/* TODO: check cert */
+	free(tls->sessionID);
+	free(tls->sessionKey);
+	free(tls);
+	return fd;
+}
+
+void
+eapreq(Eapconn *conn, int code, int id, uchar *data, int datalen)
+{
+	TLStunn *tunn;
+	int tp, frag;
+	char *user;
+
+	if(debug)
+		fprint(2, "eapreq(code=%d, id=%d, data=%.*H)\n", code, id, datalen, data);
+
+	switch(code){
+	case 1:	/* Request */
+		break;
+	case 4:	/* NAK */
+	case 3:	/* Success */
+		eapreset(conn);
+		if(code == 4 || debug)
+			fprint(2, "%s: eap code %s\n", argv0, code == 3 ? "Success" : "NAK");
+		return;
+	default:
+	unhandled:
+		if(debug)
+			fprint(2, "unhandled: %.*H\n", datalen < 0 ? 0 : datalen, data);
+		return;
+	}
+	if(datalen < 1)
+		goto unhandled;
+
+	tp = data[0];
+	switch(tp){
+	case 1:		/* Identity */
+		user = getidentity();
+		datalen = 1+strlen(user);
+		memmove(data+1, user, datalen-1);
+		eapresp(conn, 2, id, data, datalen);
+		return;
+	case 2:
+		fprint(2, "%s: eap error: %.*s\n",
+			argv0, utfnlen((char*)data+1, datalen-1), (char*)data+1);
+		return;
+	case 33:	/* EAP Extensions (AVP) */
+		if(debug)
+			fprint(2, "eap extension: %.*H\n", datalen, data);
+		eapresp(conn, 2, id, data, datalen);
+		return;
+	case 26:	/* MS-CHAP-V2 */
+		data++;
+		datalen--;
+		if(datalen < 1)
+			break;
+
+		/* OpCode */	
+		switch(data[0]){
+		case 1:	/* Challenge */
+			if(datalen > 4) {
+				uchar cid, chal[16], resp[48];
+				char user[256+1];
+				int len;
+
+				cid = data[1];
+				len = data[2]<<8 | data[3];
+				if(data[4] != sizeof(chal))
+					break;
+				if(len > datalen || (5 + data[4]) > len)
+					break;
+				memmove(chal, data+5, sizeof(chal));
+				memset(user, 0, sizeof(user));
+				memset(resp, 0, sizeof(resp));
+				if(auth_respond(chal, sizeof(chal), user, sizeof(user), resp, sizeof(resp), nil,
+					"proto=mschapv2 role=client service=wpa essid=%q", essid) < 0){
+					fprint(2, "%s: eap mschapv2: auth_respond: %r\n", argv0);
+					break;
+				}
+				len = 5 + sizeof(resp) + 1 + strlen(user);
+				data[0] = 2;		/* OpCode - Response */
+				data[1] = cid;		/* Identifier */
+				data[2] = len >> 8;
+				data[3] = len;
+				data[4] = sizeof(resp)+1;	/* ValueSize */
+				memmove(data+5, resp, sizeof(resp));
+				data[5 + sizeof(resp)] = 0;	/* flags */
+				strcpy((char*)&data[5 + sizeof(resp) + 1], user);
+
+				*(--data) = tp, len++;
+				eapresp(conn, 2, id, data, len);
+				return;
+			}
+			break;
+
+		case 3:	/* Success */
+		case 4:	/* Failure */
+			if(debug || data[0] == 4)
+				fprint(2, "%s: eap mschapv2 %s: %.*s\n", argv0,
+					data[0] == 3 ? "Success" : "Failure",
+					datalen < 4 ? 0 : utfnlen((char*)data+4, datalen-4), (char*)data+4);
+			*(--data) = tp;
+			eapresp(conn, 2, id, data, 2);
+			return;
+		}
+		break;
+
+	case 21:	/* EAP-TTLS */
+	case 25:	/* PEAP */
+		if(datalen < 2)
+			break;
+		datalen -= 2;
+		data++;
+		tunn = conn->tunn;
+		if(*data & 0x20){	/* flags: start */
+			int p[2], pid;
+
+			if(tunn != nil){
+				if(tunn->id == id && tunn->tp == tp)
+					break;	/* is retransmit, ignore */
+				eapreset(conn);
+			}
+			if(pipe(p) < 0)
+				sysfatal("pipe: %r");
+			if((pid = fork()) == -1)
+				sysfatal("fork: %r");
+			if(pid == 0){
+				close(p[0]);
+				switch(tp){
+				case 21:
+					ttlsclient(p[1]);
+					break;
+				case 25:
+					peapclient(p[1]);
+					break;
+				}
+				exits(nil);
+			}
+			close(p[1]);
+			tunn = emalloc(sizeof(TLStunn));
+			tunn->tp = tp;
+			tunn->id = id;
+			tunn->fd = p[0];
+			tunn->clientpid = pid;
+			conn->tunn = tunn;
+			if((pid = rfork(RFPROC|RFMEM)) == -1)
+				sysfatal("fork: %r");
+			if(pid == 0){
+				tunn->readerpid = getpid();
+				tlsreader(tunn, conn);
+				if(conn->tunn == tunn)
+					conn->tunn = nil;
+				close(tunn->fd);
+				free(tunn);
+				exits(nil);
+			}
+			return;
+		}
+		if(tunn == nil)
+			break;
+		if(id <= tunn->id || tunn->tp != tp)
+			break;
+		tunn->id = id;
+		frag = *data & 0x40;	/* flags: more fragments */
+		if(*data & 0x80){	/* flags: length included */
+			datalen -= 4;
+			data += 4;
+		}
+		data++;
+		if(datalen > 0)
+			write(tunn->fd, data, datalen);
+		if(frag || (tp == 25 && data[0] == 20)){	/* ack change cipher spec */
+			data -= 2;
+			data[0] = tp;
+			data[1] = 0;
+			eapresp(conn, 2, id, data, 2);
+		}
+		return;
+	}
+	goto unhandled;
+}
+
+int
+avp(uchar *p, int n, int code, void *val, int len, int pad)
+{
+	pad = 8 + ((len + pad) & ~pad);	/* header + data + data pad */
+	assert(((pad + 3) & ~3) <= n);
+	p[0] = code >> 24;
+	p[1] = code >> 16;
+	p[2] = code >> 8;
+	p[3] = code;
+	p[4] = 2;
+	p[5] = pad >> 16;
+	p[6] = pad >> 8;
+	p[7] = pad;
+	memmove(p+8, val, len);
+	len += 8;
+	pad = (pad + 3) & ~3;	/* packet padding */
+	memset(p+len, 0, pad - len);
+	return pad;
+}
+
+enum {
+	/* Avp Code */
+	AvpUserName = 1,
+	AvpUserPass = 2,
+	AvpChapPass = 3,
+	AvpChapChal = 60,
+};
+
+void
+ttlsclient(int fd)
+{
+	uchar buf[4096];
+	UserPasswd *up;
+	int n;
+
+	fd = tlswrap(fd, "ttls keying material");
+	if((up = auth_getuserpasswd(nil, "proto=pass service=wpa essid=%q", essid)) == nil)
+		sysfatal("auth_getuserpasswd: %r");
+	n = avp(buf, sizeof(buf), AvpUserName, up->user, strlen(up->user), 0);
+	n += avp(buf+n, sizeof(buf)-n, AvpUserPass, up->passwd, strlen(up->passwd), 15);
+	freeup(up);
+	write(fd, buf, n);
+	memset(buf, 0, n);
+}
+
+void
+peapwrite(Eapconn *conn, uchar *data, int len)
+{
+	assert(len >= 4);
+	fdwrite(conn, data + 4, len - 4);
+}
+
+void
+peapclient(int fd)
+{
+	static Eapconn conn;
+	uchar buf[4096], *p;
+	int n, id, code;
+
+	conn.fd = fd = tlswrap(fd, "client EAP encryption");
+	while((n = read(fd, p = buf, sizeof(buf))) > 0){
+		if(n > 4 && (p[2] << 8 | p[3]) == n && p[4] == 33){
+			code = p[0];
+			id = p[1];
+			p += 4, n -= 4;
+			conn.write = fdwrite;
+		} else {
+			code = 1;
+			id = 0;
+			conn.write = peapwrite;
+		}
+		eapreq(&conn, code, id, p, n);
+	}
+}
+
+void
+usage(void)
+{
+	fprint(2, "%s: [-dp12] [-s essid] dev\n", argv0);
+	exits("usage");
+}
+
+void
+background(void)
+{
+	if(forked || debug)
+		return;
+	switch(rfork(RFNOTEG|RFREND|RFPROC|RFNOWAIT)){
+	default:
+		exits(nil);
+	case -1:
+		sysfatal("fork: %r");
+		return;
+	case 0:
+		break;
+	}
+	forked = 1;
+}
+
+void
+main(int argc, char *argv[])
+{
+	uchar mac[Eaddrlen], buf[4096], snonce[Noncelen], anonce[Noncelen];
+	static uchar brsne[258];
+	static Eapconn conn;
+	char addr[128];
+	uchar *rsne;
+	int newptk; /* gate key reinstallation */
+	int rsnelen;
+	int n, try;
+
+	quotefmtinstall();
+	fmtinstall('H', encodefmt);
+	fmtinstall('E', eipfmt);
+
+	rsne = nil;
+	rsnelen = -1;
+	peercipher = nil;
+	groupcipher = nil;
+
+	ARGBEGIN {
+	case 'd':
+		debug = 1;
+		break;
+	case 'p':
+		prompt = 1;
+		break;
+	case 's':
+		strncpy(essid, EARGF(usage()), 32);
+		break;
+	case '1':
+		rsne = wpaie;
+		rsnelen = sizeof(wpaie);
+		peercipher = &tkip;
+		groupcipher = &tkip;
+		break;
+	case '2':
+		rsne = rsnie;
+		rsnelen = sizeof(rsnie);
+		peercipher = &ccmp;
+		groupcipher = &ccmp;
+		break;
+	default:
+		usage();
+	} ARGEND;
+
+	if(*argv != nil)
+		dev = *argv++;
+
+	if(*argv != nil || dev == nil)
+		usage();
+
+	if(myetheraddr(mac, dev) < 0)
+		sysfatal("can't get mac address: %r");
+
+	snprint(addr, sizeof(addr), "%s!0x888e", dev);
+	if((fd = dial(addr, nil, devdir, &cfd)) < 0)
+		sysfatal("dial: %r");
+
+	if(essid[0] != 0){
+		if(fprint(cfd, "essid %q", essid) < 0)
+			sysfatal("write essid: %r");
+	} else if(prompt) {
+		getessid();
+		if(essid[0] == 0)
+			sysfatal("no essid set");
+	}
+	if(!prompt)
+		background();
+
+Connect:
+ 	/* bss scan might not be complete yet, so check for 10 seconds.	*/
+	for(try = 100; (forked || try >= 0) && !connected(); try--)
+		sleep(100);
+
+	authtype = AuthPSK;
+	if(rsnelen <= 0 || rsne == brsne){
+		rsne = brsne;
+		rsnelen = buildrsne(rsne);
+	}
+	if(rsnelen > 0){
+		if(debug)
+			fprint(2, "rsne: %.*H\n", rsnelen, rsne);
+		/*
+		 * we use write() instead of fprint so the message gets written
+		 * at once and not chunked up on fprint buffer.
+		 */
+		n = sprint((char*)buf, "auth %.*H", rsnelen, rsne);
+		if(write(cfd, buf, n) != n)
+			sysfatal("write auth: %r");
+	} else {
+		authtype = AuthNone;
+	}
+
+	conn.fd = fd;
+	conn.write = eapwrite;
+	conn.type = 1;	/* Start */
+	conn.version = 1;
+	memmove(conn.smac, mac, Eaddrlen);
+	getbssid(conn.amac);
+
+	if(prompt){
+		UserPasswd *up;
+		prompt = 0;
+		switch(authtype){
+		case AuthNone:
+			print("no authentication required\n");
+			break;
+		case AuthPSK:
+			/* dummy to for factotum keyprompt */
+			genrandom(anonce, sizeof(anonce));
+			genrandom(snonce, sizeof(snonce));
+			getptk(auth_getkey, conn.smac, conn.amac, snonce, anonce, ptk);
+			break;
+		case AuthWPA:
+			up = auth_getuserpasswd(auth_getkey, "proto=pass service=wpa essid=%q", essid);
+			if(up != nil){
+				factotumctl("key proto=mschapv2 role=client service=wpa"
+					" essid=%q user=%q !password=%q\n",
+					essid, up->user, up->passwd);
+				freeup(up);
+			}
+			break;
+		}
+		background();
+	}
+
+	genrandom(ptk, sizeof(ptk));
+	newptk = 0;
+
+	lastrepc = 0ULL;
+	for(;;){
+		uchar *p, *e, *m;
+		int proto, flags, vers, datalen;
+		uvlong repc, rsc, tsc;
+		Keydescr *kd;
+
+		if((n = read(fd, buf, sizeof(buf))) < 0)
+			sysfatal("read: %r");
+
+		if(n == 0){
+			if(debug)
+				fprint(2, "got deassociation\n");
+			eapreset(&conn);
+			goto Connect;
+		}
+
+		p = buf;
+		e = buf+n;
+		if(n < 2*Eaddrlen + 2)
+			continue;
+
+		memmove(conn.smac, p, Eaddrlen); p += Eaddrlen;
+		memmove(conn.amac, p, Eaddrlen); p += Eaddrlen;
+		proto = p[0]<<8 | p[1]; p += 2;
+
+		if(proto != 0x888e || memcmp(conn.smac, mac, Eaddrlen) != 0)
+			continue;
+
+		m = p;
+		n = e - p;
+		if(n < 4)
+			continue;
+
+		conn.version = p[0];
+		if(conn.version != 0x01 && conn.version != 0x02)
+			continue;
+		conn.type = p[1];
+		n = p[2]<<8 | p[3];
+		p += 4;
+		if(p+n > e)
+			continue;
+		e = p + n;
+
+		if(debug)
+			fprint(2, "\nrecv(v%d,t%d) %E <- %E: ", conn.version, conn.type, conn.smac, conn.amac);
+
+		if(authtype == AuthNone)
+			continue;
+
+		if(conn.type == 0x00 && authtype == AuthWPA){
+			uchar code, id;
+
+			if(n < 4)
+				continue;
+			code = p[0];
+			id = p[1];
+			n = p[3] | p[2]<<8;
+			if(n < 4 || p + n > e)
+				continue;
+			p += 4, n -= 4;
+			eapreq(&conn, code, id, p, n);
+			continue;
+		}
+
+		if(conn.type != 0x03)
+			continue;
+
+		if(n < Keydescrlen){
+			if(debug)
+				fprint(2, "bad kd size\n");
+			continue;
+		}
+		kd = (Keydescr*)p;
+		if(debug)
+			dumpkeydescr(kd);
+
+		if(kd->type[0] != 0xFE && kd->type[0] != 0x02)
+			continue;
+
+		vers = kd->flags[1] & 7;
+		flags = kd->flags[0]<<8 | kd->flags[1];
+		datalen = kd->datalen[0]<<8 | kd->datalen[1];
+		if(kd->data + datalen > e)
+			continue;
+
+		if((flags & Fmic) == 0){
+			if((flags & (Fptk|Fack)) != (Fptk|Fack))
+				continue;
+
+			memmove(anonce, kd->nonce, sizeof(anonce));
+			genrandom(snonce, sizeof(snonce));
+			if(getptk(nil, conn.smac, conn.amac, snonce, anonce, ptk) != 0){
+				if(debug)
+					fprint(2, "getptk: %r\n");
+				continue;
+			}
+			/* allow installation of new keys */	
+			newptk = 1;
+
+			/* ack key exchange with mic */
+			memset(kd->rsc, 0, sizeof(kd->rsc));
+			memset(kd->eapoliv, 0, sizeof(kd->eapoliv));
+			memmove(kd->nonce, snonce, sizeof(kd->nonce));
+			replykey(&conn, (flags & ~(Fack|Fins)) | Fmic, kd, rsne, rsnelen);
+		} else {
+			uchar gtk[GTKlen];
+			int gtklen, gtkkid;
+
+			if(checkmic(kd, m, e - m) != 0){
+				if(debug)
+					fprint(2, "bad mic\n");
+				continue;
+			}
+
+			repc =	(uvlong)kd->repc[7] |
+				(uvlong)kd->repc[6]<<8 |
+				(uvlong)kd->repc[5]<<16 |
+				(uvlong)kd->repc[4]<<24 |
+				(uvlong)kd->repc[3]<<32 |
+				(uvlong)kd->repc[2]<<40 |
+				(uvlong)kd->repc[1]<<48 |
+				(uvlong)kd->repc[0]<<56;
+			if(repc <= lastrepc){
+				if(debug)
+					fprint(2, "bad repc: %llux <= %llux\n", repc, lastrepc);
+				continue;
+			}
+			lastrepc = repc;
+
+			rsc =	(uvlong)kd->rsc[0] |
+				(uvlong)kd->rsc[1]<<8 |
+				(uvlong)kd->rsc[2]<<16 |
+				(uvlong)kd->rsc[3]<<24 |
+				(uvlong)kd->rsc[4]<<32 |
+				(uvlong)kd->rsc[5]<<40;
+
+			if(datalen > 0 && (flags & Fenc) != 0){
+				if(vers == 1)
+					datalen = rc4unwrap(ptk+16, kd->eapoliv, kd->data, datalen);
+				else
+					datalen = aesunwrap(ptk+16, 16, kd->data, datalen);
+				if(datalen <= 0){
+					if(debug)
+						fprint(2, "bad keywrap\n");
+					continue;
+				}
+				if(debug)
+					fprint(2, "unwraped keydata[%.4x]=%.*H\n", datalen, datalen, kd->data);
+			}
+
+			gtklen = 0;
+			gtkkid = -1;
+
+			if(kd->type[0] != 0xFE || (flags & (Fptk|Fack)) == (Fptk|Fack)){
+				uchar *p, *x, *e;
+
+				p = kd->data;
+				e = p + datalen;
+				for(; p+2 <= e; p = x){
+					if((x = p+2+p[1]) > e)
+						break;
+					if(debug)
+						fprint(2, "ie=%.2x data[%.2x]=%.*H\n", p[0], p[1], p[1], p+2);
+					if(p[0] == 0x30){ /* RSN */
+					}
+					if(p[0] == 0xDD){ /* WPA */
+						static uchar oui[] = { 0x00, 0x0f, 0xac, 0x01, };
+
+						if(p+2+sizeof(oui) > x || memcmp(p+2, oui, sizeof(oui)) != 0)
+							continue;
+						if((flags & Fenc) == 0)
+							continue;	/* ignore gorup key if unencrypted */
+						gtklen = x - (p + 8);
+						if(gtklen <= 0)
+							continue;
+						if(gtklen > sizeof(gtk))
+							gtklen = sizeof(gtk);
+						memmove(gtk, p + 8, gtklen);
+						gtkkid = p[6] & 3;
+					}
+				}
+			}
+
+			if((flags & (Fptk|Fack)) == (Fptk|Fack)){
+				if(!newptk)	/* a retransmit, already installed PTK */
+					continue;
+				if(vers != 1)	/* in WPA2, RSC is for group key only */
+					tsc = 0LL;
+				else {
+					tsc = rsc;
+					rsc = 0LL;
+				}
+				/* install pairwise receive key (PTK) */
+				if(fprint(cfd, "rxkey %E %s:%.*H@%llux", conn.amac,
+					peercipher->name, peercipher->keylen, ptk+32, tsc) < 0)
+					sysfatal("write rxkey: %r");
+
+				memset(kd->rsc, 0, sizeof(kd->rsc));
+				memset(kd->eapoliv, 0, sizeof(kd->eapoliv));
+				memset(kd->nonce, 0, sizeof(kd->nonce));
+				replykey(&conn, flags & ~(Fack|Fenc|Fins), kd, nil, 0);
+				sleep(100);
+
+				tsc = 0LL;
+				/* install pairwise transmit key (PTK) */ 
+				if(fprint(cfd, "txkey %E %s:%.*H@%llux", conn.amac,
+					peercipher->name, peercipher->keylen, ptk+32, tsc) < 0)
+					sysfatal("write txkey: %r");
+				newptk = 0; /* prevent PTK re-installation on (replayed) retransmits */
+			} else
+			if((flags & (Fptk|Fsec|Fack)) == (Fsec|Fack)){
+				if(kd->type[0] == 0xFE){
+					/* WPA always RC4 encrypts the GTK, even tho the flag isnt set */
+					if((flags & Fenc) == 0)
+						datalen = rc4unwrap(ptk+16, kd->eapoliv, kd->data, datalen);
+					gtklen = datalen;
+					if(gtklen > sizeof(gtk))
+						gtklen = sizeof(gtk);
+					memmove(gtk, kd->data, gtklen);
+					gtkkid = (flags >> 4) & 3;
+				}
+				memset(kd->rsc, 0, sizeof(kd->rsc));
+				memset(kd->eapoliv, 0, sizeof(kd->eapoliv));
+				memset(kd->nonce, 0, sizeof(kd->nonce));
+				replykey(&conn, flags & ~(Fenc|Fack), kd, nil, 0);
+			} else
+				continue;
+			/* install group key (GTK) */
+			if(gtklen >= groupcipher->keylen && gtkkid != -1)
+				if(fprint(cfd, "rxkey%d %E %s:%.*H@%llux",
+					gtkkid, conn.amac, 
+					groupcipher->name, groupcipher->keylen, gtk, rsc) < 0)
+					sysfatal("write rxkey%d: %r", gtkkid);
+		}
+	}
+}