patches/next_proto_neg.patch

commit ed5845e49b3c76f8735ec00e151a7b234acc266c
Author: Adam Langley <agl@chromium.org>
Date:   Thu Nov 4 16:06:58 2010 -0400

    next_proto_neg.patch

diff --git a/apps/apps.c b/apps/apps.c
index ab60b70..eede8a8 100644
--- a/apps/apps.c
+++ b/apps/apps.c
@@ -2579,3 +2579,45 @@ void jpake_server_auth(BIO *out, BIO *conn, const char *secret)
 	}
 
 #endif
+
+/* next_protos_parse parses a comma separated list of strings into a string
+ * in a format suitable for passing to SSL_CTX_set_next_protos_advertised.
+ *   outlen: (output) set to the length of the resulting buffer on success.
+ *   err: (maybe NULL) on failure, an error message line is written to this BIO.
+ *   in: a NUL termianted string like "abc,def,ghi"
+ *
+ *   returns: a malloced buffer
+ */
+unsigned char *next_protos_parse(unsigned short *outlen, const char *in)
+	{
+	size_t len;
+	unsigned char *out;
+	size_t i, start = 0;
+
+	len = strlen(in);
+	if (len > 65535)
+		return NULL;
+
+	out = OPENSSL_malloc(strlen(in) + 1);
+	if (!out)
+		return NULL;
+
+	for (i = 0; i <= len; ++i)
+		{
+		if (i == len || in[i] == ',')
+			{
+			if (i - start > 255)
+				{
+				OPENSSL_free(out);
+				return NULL;
+				}
+			out[start] = i - start;
+			start = i + 1;
+			}
+		else
+			out[i+1] = in[i];
+		}
+
+	*outlen = len + 1;
+	return out;
+	}
diff --git a/apps/s_apps.h b/apps/s_apps.h
index f5a39ba..513bcfe 100644
--- a/apps/s_apps.h
+++ b/apps/s_apps.h
@@ -174,3 +174,5 @@ void MS_CALLBACK tlsext_cb(SSL *s, int client_server, int type,
 
 int MS_CALLBACK generate_cookie_callback(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len);
 int MS_CALLBACK verify_cookie_callback(SSL *ssl, unsigned char *cookie, unsigned int cookie_len);
+
+unsigned char *next_protos_parse(unsigned short *outlen, const char *in);
diff --git a/apps/s_client.c b/apps/s_client.c
index c071658..6033e77 100644
--- a/apps/s_client.c
+++ b/apps/s_client.c
@@ -249,6 +249,7 @@ static void sc_usage(void)
 	BIO_printf(bio_err," -status           - request certificate status from server\n");
 	BIO_printf(bio_err," -no_ticket        - disable use of RFC4507bis session tickets\n");
 	BIO_printf(bio_err," -cutthrough       - enable 1-RTT full-handshake for strong ciphers\n");
+	BIO_printf(bio_err," -nextprotoneg arg - enable NPN extension, considering named protocols supported (comma-separated list)\n");
 #endif
 	BIO_printf(bio_err," -legacy_renegotiation - enable use of legacy renegotiation (dangerous)\n");
 	}
@@ -284,6 +285,38 @@ enum
 	PROTO_XMPP
 };
 
+/* This the context that we pass to next_proto_cb */
+typedef struct tlsextnextprotoctx_st {
+	unsigned char *data;
+	unsigned short len;
+	int status;
+} tlsextnextprotoctx;
+
+static tlsextnextprotoctx next_proto;
+
+static int next_proto_cb(SSL *s, unsigned char **out, unsigned char *outlen, const unsigned char *in, unsigned int inlen, void *arg)
+	{
+	tlsextnextprotoctx *ctx = arg;
+
+	if (!c_quiet)
+		{
+		/* We can assume that |in| is syntactically valid. */
+		unsigned i;
+		BIO_printf(bio_c_out, "Protocols advertised by server: ");
+		for (i = 0; i < inlen; )
+			{
+			if (i)
+				BIO_write(bio_c_out, ", ", 2);
+			BIO_write(bio_c_out, &in[i + 1], in[i]);
+			i += in[i] + 1;
+			}
+		BIO_write(bio_c_out, "\n", 1);
+		}
+
+	ctx->status = SSL_select_next_proto(out, outlen, in, inlen, ctx->data, ctx->len);
+	return SSL_TLSEXT_ERR_OK;
+	}
+
 int MAIN(int, char **);
 
 int MAIN(int argc, char **argv)
@@ -336,6 +369,7 @@ int MAIN(int argc, char **argv)
 	char *servername = NULL; 
         tlsextctx tlsextcbp = 
         {NULL,0};
+	const char *next_proto_neg_in = NULL;
 #endif
 	char *sess_in = NULL;
 	char *sess_out = NULL;
@@ -536,6 +570,11 @@ int MAIN(int argc, char **argv)
 #ifndef OPENSSL_NO_TLSEXT
 		else if	(strcmp(*argv,"-no_ticket") == 0)
 			{ off|=SSL_OP_NO_TICKET; }
+		else if (strcmp(*argv,"-nextprotoneg") == 0)
+			{
+			if (--argc < 1) goto bad;
+			next_proto_neg_in = *(++argv);
+			}
 #endif
 		else if (strcmp(*argv,"-cutthrough") == 0)
 			cutthrough=1;
@@ -624,6 +663,21 @@ bad:
 	OpenSSL_add_ssl_algorithms();
 	SSL_load_error_strings();
 
+#ifndef OPENSSL_NO_TLSEXT
+	next_proto.status = -1;
+	if (next_proto_neg_in)
+		{
+		next_proto.data = next_protos_parse(&next_proto.len, next_proto_neg_in);
+		if (next_proto.data == NULL)
+			{
+			BIO_printf(bio_err, "Error parsing -nextprotoneg argument\n");
+			goto end;
+			}
+		}
+	else
+		next_proto.data = NULL;
+#endif
+
 #ifndef OPENSSL_NO_ENGINE
         e = setup_engine(bio_err, engine_id, 1);
 	if (ssl_client_engine_id)
@@ -738,6 +792,9 @@ bad:
 		SSL_CTX_set_mode(ctx, ssl_mode);
 		}
 
+	if (next_proto.data)
+		SSL_CTX_set_next_proto_select_cb(ctx, next_proto_cb, &next_proto);
+
 	if (state) SSL_CTX_set_info_callback(ctx,apps_ssl_info_callback);
 	if (cipher != NULL)
 		if(!SSL_CTX_set_cipher_list(ctx,cipher)) {
@@ -1555,6 +1612,20 @@ static void print_stuff(BIO *bio, SSL *s, int full)
 	BIO_printf(bio,"Expansion: %s\n",
 		expansion ? SSL_COMP_get_name(expansion) : "NONE");
 #endif
+
+#ifndef OPENSSL_NO_TLSEXT
+	{
+		if (next_proto.status != -1) {
+			const unsigned char *proto;
+			unsigned int proto_len;
+			SSL_get0_next_proto_negotiated(s, &proto, &proto_len);
+			BIO_printf(bio, "Next protocol: (%d) ", next_proto.status);
+			BIO_write(bio, proto, proto_len);
+			BIO_write(bio, "\n", 1);
+		}
+	}
+#endif
+
 	SSL_SESSION_print(bio,SSL_get_session(s));
 	BIO_printf(bio,"---\n");
 	if (peer != NULL)
diff --git a/apps/s_server.c b/apps/s_server.c
index 88b308c..c4e19c9 100644
--- a/apps/s_server.c
+++ b/apps/s_server.c
@@ -405,6 +405,7 @@ static void sv_usage(void)
 	BIO_printf(bio_err," -tlsextdebug  - hex dump of all TLS extensions received\n");
 	BIO_printf(bio_err," -no_ticket    - disable use of RFC4507bis session tickets\n");
 	BIO_printf(bio_err," -legacy_renegotiation - enable use of legacy renegotiation (dangerous)\n");
+	BIO_printf(bio_err," -nextprotoneg arg - set the advertised protocols for the NPN extension (comma-separated list)\n");
 #endif
 	}
 
@@ -740,6 +741,26 @@ BIO_printf(err, "cert_status: received %d ids\n", sk_OCSP_RESPID_num(ids));
 	goto done;
 	}
 #endif
+
+
+/* This the context that we pass to next_proto_cb */
+typedef struct tlsextnextprotoctx_st {
+	unsigned char *data;
+	unsigned int len;
+} tlsextnextprotoctx;
+
+
+static int next_proto_cb(SSL *s, const unsigned char **data, unsigned int *len, void *arg)
+	{
+	tlsextnextprotoctx *next_proto = arg;
+
+	*data = next_proto->data;
+	*len = next_proto->len;
+
+	return SSL_TLSEXT_ERR_OK;
+	}
+
+
 int MAIN(int, char **);
 
 #ifndef OPENSSL_NO_JPAKE
@@ -779,6 +800,8 @@ int MAIN(int argc, char *argv[])
 #endif
 #ifndef OPENSSL_NO_TLSEXT
         tlsextctx tlsextcbp = {NULL, NULL, SSL_TLSEXT_ERR_ALERT_WARNING};
+	const char *next_proto_neg_in = NULL;
+	tlsextnextprotoctx next_proto;
 #endif
 
 #if !defined(OPENSSL_NO_SSL2) && !defined(OPENSSL_NO_SSL3)
@@ -1077,7 +1100,11 @@ int MAIN(int argc, char *argv[])
 			if (--argc < 1) goto bad;
 			s_key_file2= *(++argv);
 			}
-			
+		else if	(strcmp(*argv,"-nextprotoneg") == 0)
+			{
+			if (--argc < 1) goto bad;
+			next_proto_neg_in = *(++argv);
+			}
 #endif
 #ifndef OPENSSL_NO_JPAKE
 		else if (strcmp(*argv,"-jpake") == 0)
@@ -1162,6 +1189,20 @@ bad:
 				goto end;
 				}
 			}
+
+		if (next_proto_neg_in)
+			{
+			unsigned short len;
+			next_proto.data = next_protos_parse(&len,
+				next_proto_neg_in);
+			if (next_proto.data == NULL)
+				goto end;
+			next_proto.len = len;
+			}
+		else
+			{
+			next_proto.data = NULL;
+			}
 #endif
 		}
 	if (s_dcert_file)
@@ -1341,6 +1382,11 @@ bad:
 		store = SSL_CTX_get_cert_store(ctx2);
 		X509_STORE_set_flags(store, vflags);
 		}
+
+	if (next_proto.data)
+		{
+		SSL_CTX_set_next_protos_advertised_cb(ctx, next_proto_cb, &next_proto);
+		}
 #endif 
 
 
@@ -1980,6 +2026,10 @@ static int init_ssl_connection(SSL *con)
 	X509 *peer;
 	long verify_error;
 	MS_STATIC char buf[BUFSIZ];
+#ifndef OPENSSL_NO_TLSEXT
+	const unsigned char *next_proto_neg;
+	unsigned next_proto_neg_len;
+#endif
 
 	if ((i=SSL_accept(con)) <= 0)
 		{
@@ -2019,6 +2069,14 @@ static int init_ssl_connection(SSL *con)
 		BIO_printf(bio_s_out,"Shared ciphers:%s\n",buf);
 	str=SSL_CIPHER_get_name(SSL_get_current_cipher(con));
 	BIO_printf(bio_s_out,"CIPHER is %s\n",(str != NULL)?str:"(NONE)");
+#ifndef OPENSSL_NO_TLSEXT
+	SSL_get0_next_proto_negotiated(con, &next_proto_neg, &next_proto_neg_len);
+	if (next_proto_neg) {
+		BIO_printf(bio_s_out,"NEXTPROTO is ");
+		BIO_write(bio_s_out, next_proto_neg, next_proto_neg_len);
+		BIO_printf(bio_s_out, "\n");
+	}
+#endif
 	if (con->hit) BIO_printf(bio_s_out,"Reused session-id\n");
 	if (SSL_ctrl(con,SSL_CTRL_GET_FLAGS,0,NULL) &
 		TLS1_FLAGS_TLS_PADDING_BUG)
diff --git a/ssl/s3_both.c b/ssl/s3_both.c
index 869a25d..b88288e 100644
--- a/ssl/s3_both.c
+++ b/ssl/s3_both.c
@@ -204,16 +204,34 @@ int ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
 	return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 	}
 
+/* ssl3_take_mac calculates the Finished MAC for the handshakes messages seen to far. */
+void ssl3_take_mac(SSL *s) {
+	const char *sender;
+	int slen;
+
+	if (s->state & SSL_ST_CONNECT)
+		{
+		sender=s->method->ssl3_enc->server_finished_label;
+		slen=s->method->ssl3_enc->server_finished_label_len;
+		}
+	else
+		{
+		sender=s->method->ssl3_enc->client_finished_label;
+		slen=s->method->ssl3_enc->client_finished_label_len;
+		}
+
+	s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
+		&(s->s3->finish_dgst1),
+		&(s->s3->finish_dgst2),
+		sender,slen,s->s3->tmp.peer_finish_md);
+}
+
 int ssl3_get_finished(SSL *s, int a, int b)
 	{
 	int al,i,ok;
 	long n;
 	unsigned char *p;
 
-	/* the mac has already been generated when we received the
-	 * change cipher spec message and is in s->s3->tmp.peer_finish_md
-	 */ 
-
 	n=s->method->ssl_get_message(s,
 		a,
 		b,
@@ -516,6 +534,11 @@ long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
 		s->init_num += i;
 		n -= i;
 		}
+	/* If receiving Finished, record MAC of prior handshake messages for
+	 * Finished verification. */
+	if (*s->init_buf->data == SSL3_MT_FINISHED)
+		ssl3_take_mac(s);
+	/* Feed this message into MAC computation. */
 	ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num + 4);
 	if (s->msg_callback)
 		s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data, (size_t)s->init_num + 4, s, s->msg_callback_arg);
diff --git a/ssl/s3_clnt.c b/ssl/s3_clnt.c
index 6173dbe..f9e1554 100644
--- a/ssl/s3_clnt.c
+++ b/ssl/s3_clnt.c
@@ -404,7 +404,11 @@ int ssl3_connect(SSL *s)
 			ret=ssl3_send_change_cipher_spec(s,
 				SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 			if (ret <= 0) goto end;
-			s->state=SSL3_ST_CW_FINISHED_A;
+
+			if (s->next_proto_negotiated)
+				s->state=SSL3_ST_CW_NEXT_PROTO_A;
+			else
+				s->state=SSL3_ST_CW_FINISHED_A;
 			s->init_num=0;
 
 			s->session->cipher=s->s3->tmp.new_cipher;
@@ -432,6 +436,13 @@ int ssl3_connect(SSL *s)
 
 			break;
 
+		case SSL3_ST_CW_NEXT_PROTO_A:
+		case SSL3_ST_CW_NEXT_PROTO_B:
+			ret=ssl3_send_next_proto(s);
+			if (ret <= 0) goto end;
+			s->state=SSL3_ST_CW_FINISHED_A;
+			break;
+
 		case SSL3_ST_CW_FINISHED_A:
 		case SSL3_ST_CW_FINISHED_B:
 			ret=ssl3_send_finished(s,
@@ -2752,6 +2763,30 @@ static int curve_id2nid(int curve_id)
 }
 #endif
 
+int ssl3_send_next_proto(SSL *s)
+	{
+	unsigned int len, padding_len;
+	unsigned char *d;
+
+	if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
+		{
+		len = s->next_proto_negotiated_len;
+		padding_len = 32 - ((len + 2) % 32);
+		d = (unsigned char *)s->init_buf->data;
+		d[4] = len;
+		memcpy(d + 5, s->next_proto_negotiated, len);
+		d[5 + len] = padding_len;
+		memset(d + 6 + len, 0, padding_len);
+		*(d++)=SSL3_MT_NEXT_PROTO;
+		l2n3(2 + len + padding_len, d);
+		s->state = SSL3_ST_CW_NEXT_PROTO_B;
+		s->init_num = 4 + 2 + len + padding_len;
+		s->init_off = 0;
+		}
+
+	return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
+}
+
 /* Check to see if handshake is full or resumed. Usually this is just a
  * case of checking to see if a cache hit has occurred. In the case of
  * session tickets we have to check the next message to be sure.
diff --git a/ssl/s3_lib.c b/ssl/s3_lib.c
index 2c44bde..84bff8d 100644
--- a/ssl/s3_lib.c
+++ b/ssl/s3_lib.c
@@ -1751,6 +1751,14 @@ void ssl3_clear(SSL *s)
 	s->s3->num_renegotiations=0;
 	s->s3->in_read_app_data=0;
 	s->version=SSL3_VERSION;
+
+#ifndef OPENSSL_NO_TLSEXT
+	if (s->next_proto_negotiated) {
+		OPENSSL_free(s->next_proto_negotiated);
+		s->next_proto_negotiated = 0;
+		s->next_proto_negotiated_len = 0;
+	}
+#endif
 	}
 
 long ssl3_ctrl(SSL *s, int cmd, long larg, void *parg)
diff --git a/ssl/s3_pkt.c b/ssl/s3_pkt.c
index 5e3583c..6853058 100644
--- a/ssl/s3_pkt.c
+++ b/ssl/s3_pkt.c
@@ -1264,8 +1264,6 @@ err:
 int ssl3_do_change_cipher_spec(SSL *s)
 	{
 	int i;
-	const char *sender;
-	int slen;
 
 	if (s->state & SSL_ST_ACCEPT)
 		i=SSL3_CHANGE_CIPHER_SERVER_READ;
@@ -1288,25 +1286,6 @@ int ssl3_do_change_cipher_spec(SSL *s)
 	if (!s->method->ssl3_enc->change_cipher_state(s,i))
 		return(0);
 
-	/* we have to record the message digest at
-	 * this point so we can get it before we read
-	 * the finished message */
-	if (s->state & SSL_ST_CONNECT)
-		{
-		sender=s->method->ssl3_enc->server_finished_label;
-		slen=s->method->ssl3_enc->server_finished_label_len;
-		}
-	else
-		{
-		sender=s->method->ssl3_enc->client_finished_label;
-		slen=s->method->ssl3_enc->client_finished_label_len;
-		}
-
-	s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
-		&(s->s3->finish_dgst1),
-		&(s->s3->finish_dgst2),
-		sender,slen,s->s3->tmp.peer_finish_md);
-
 	return(1);
 	}
 
diff --git a/ssl/s3_srvr.c b/ssl/s3_srvr.c
index e696450..8e0a504 100644
--- a/ssl/s3_srvr.c
+++ b/ssl/s3_srvr.c
@@ -499,7 +499,10 @@ int ssl3_accept(SSL *s)
 				 * a certificate, the CertificateVerify
 				 * message is not sent.
 				 */
-				s->state=SSL3_ST_SR_FINISHED_A;
+				if (s->s3->next_proto_neg_seen)
+					s->state=SSL3_ST_SR_NEXT_PROTO_A;
+				else
+					s->state=SSL3_ST_SR_FINISHED_A;
 				s->init_num = 0;
 				}
 			else   
@@ -526,10 +529,21 @@ int ssl3_accept(SSL *s)
 			ret=ssl3_get_cert_verify(s);
 			if (ret <= 0) goto end;
 
-			s->state=SSL3_ST_SR_FINISHED_A;
+			if (s->s3->next_proto_neg_seen)
+				s->state=SSL3_ST_SR_NEXT_PROTO_A;
+			else
+				s->state=SSL3_ST_SR_FINISHED_A;
 			s->init_num=0;
 			break;
 
+		case SSL3_ST_SR_NEXT_PROTO_A:
+		case SSL3_ST_SR_NEXT_PROTO_B:
+			ret=ssl3_get_next_proto(s);
+			if (ret <= 0) goto end;
+			s->init_num = 0;
+			s->state=SSL3_ST_SR_FINISHED_A;
+			break;
+
 		case SSL3_ST_SR_FINISHED_A:
 		case SSL3_ST_SR_FINISHED_B:
 			ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
@@ -597,7 +611,12 @@ int ssl3_accept(SSL *s)
 			if (ret <= 0) goto end;
 			s->state=SSL3_ST_SW_FLUSH;
 			if (s->hit)
-				s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
+				{
+				if (s->s3->next_proto_neg_seen)
+					s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
+				else
+					s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
+				}
 			else
 				s->s3->tmp.next_state=SSL_ST_OK;
 			s->init_num=0;
@@ -2324,6 +2343,70 @@ err:
 	return(-1);
 	}
 
+/* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
+ * sets the next_proto member in s if found */
+int ssl3_get_next_proto(SSL *s)
+	{
+	int ok;
+	unsigned proto_len, padding_len;
+	long n;
+	const unsigned char *p;
+
+	/* Clients cannot send a NextProtocol message if we didn't see the
+	 * extension in their ClientHello */
+	if (!s->s3->next_proto_neg_seen) {
+		SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
+		return -1;
+	}
+
+	n=s->method->ssl_get_message(s,
+		SSL3_ST_SR_NEXT_PROTO_A,
+		SSL3_ST_SR_NEXT_PROTO_B,
+		SSL3_MT_NEXT_PROTO,
+		129,
+		&ok);
+
+	if (!ok)
+		return((int)n);
+
+	/* s->state doesn't reflect whether ChangeCipherSpec has been received
+	 * in this handshake, but s->s3->change_cipher_spec does (will be reset
+	 * by ssl3_get_finished). */
+	if (!s->s3->change_cipher_spec)
+		{
+		SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
+		return -1;
+		}
+
+	if (n < 2)
+		return 0;  // The body must be > 1 bytes long */
+
+	p=(unsigned char *)s->init_msg;
+
+	/* The payload looks like:
+	 *   uint8 proto_len;
+	 *   uint8 proto[proto_len];
+	 *   uint8 padding_len;
+	 *   uint8 padding[padding_len];
+	 */
+	proto_len = p[0];
+	if (proto_len + 2 > s->init_num)
+		return 0;
+	padding_len = p[proto_len + 1];
+	if (proto_len + padding_len + 2 != s->init_num)
+		return 0;
+
+	s->next_proto_negotiated = OPENSSL_malloc(proto_len);
+	if (!s->next_proto_negotiated) {
+		SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
+		return 0;
+	}
+	memcpy(s->next_proto_negotiated, p + 1, proto_len);
+	s->next_proto_negotiated_len = proto_len;
+
+	return 1;
+	}
+
 int ssl3_get_cert_verify(SSL *s)
 	{
 	EVP_PKEY *pkey=NULL;
diff --git a/ssl/ssl.h b/ssl/ssl.h
index 9ab9495..dc8dff8 100644
--- a/ssl/ssl.h
+++ b/ssl/ssl.h
@@ -801,6 +801,23 @@ struct ssl_ctx_st
 	/* Callback for status request */
 	int (*tlsext_status_cb)(SSL *ssl, void *arg);
 	void *tlsext_status_arg;
+
+	/* Next protocol negotiation information */
+	/* (for experimental NPN extension). */
+
+	/* For a server, this contains a callback function by which the set of
+	 * advertised protocols can be provided. */
+	int (*next_protos_advertised_cb)(SSL *s, const unsigned char **buf,
+			                 unsigned int *len, void *arg);
+	void *next_protos_advertised_cb_arg;
+	/* For a client, this contains a callback function that selects the
+	 * next protocol from the list provided by the server. */
+	int (*next_proto_select_cb)(SSL *s, unsigned char **out,
+				    unsigned char *outlen,
+				    const unsigned char *in,
+				    unsigned int inlen,
+				    void *arg);
+	void *next_proto_select_cb_arg;
 #endif
 
 	};
@@ -857,6 +874,15 @@ int SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e);
 #endif
 void SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx, int (*app_gen_cookie_cb)(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len));
 void SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx, int (*app_verify_cookie_cb)(SSL *ssl, unsigned char *cookie, unsigned int cookie_len));
+void SSL_CTX_set_next_protos_advertised_cb(SSL_CTX *s, int (*cb) (SSL *ssl, const unsigned char **out, unsigned int *outlen, void *arg), void *arg);
+void SSL_CTX_set_next_proto_select_cb(SSL_CTX *s, int (*cb) (SSL *ssl, unsigned char **out, unsigned char *outlen, const unsigned char *in, unsigned int inlen, void *arg), void *arg);
+
+int SSL_select_next_proto(unsigned char **out, unsigned char *outlen, const unsigned char *in, unsigned int inlen, const unsigned char *client, unsigned int client_len);
+void SSL_get0_next_proto_negotiated(const SSL *s, const unsigned char **data, unsigned *len);
+
+#define OPENSSL_NPN_UNSUPPORTED	0
+#define OPENSSL_NPN_NEGOTIATED	1
+#define OPENSSL_NPN_NO_OVERLAP	2
 
 #define SSL_NOTHING	1
 #define SSL_WRITING	2
@@ -1054,6 +1080,16 @@ struct ssl_st
 	/* RFC4507 session ticket expected to be received or sent */
 	int tlsext_ticket_expected;
 	SSL_CTX * initial_ctx; /* initial ctx, used to store sessions */
+
+	/* Next protocol negotiation. For the client, this is the protocol that
+	 * we sent in NextProtocol and is set when handling ServerHello
+	 * extensions.
+	 *
+	 * For a server, this is the client's selected_protocol from
+	 * NextProtocol and is set when handling the NextProtocol message,
+	 * before the Finished message. */
+	unsigned char *next_proto_negotiated;
+	unsigned char next_proto_negotiated_len;
 #define session_ctx initial_ctx
 #else
 #define session_ctx ctx
@@ -1761,6 +1797,7 @@ void ERR_load_SSL_strings(void);
 #define SSL_F_SSL3_GET_KEY_EXCHANGE			 141
 #define SSL_F_SSL3_GET_MESSAGE				 142
 #define SSL_F_SSL3_GET_NEW_SESSION_TICKET		 283
+#define SSL_F_SSL3_GET_NEXT_PROTO			 297
 #define SSL_F_SSL3_GET_RECORD				 143
 #define SSL_F_SSL3_GET_SERVER_CERTIFICATE		 144
 #define SSL_F_SSL3_GET_SERVER_DONE			 145
@@ -1827,6 +1864,7 @@ void ERR_load_SSL_strings(void);
 #define SSL_F_SSL_INIT_WBIO_BUFFER			 184
 #define SSL_F_SSL_LOAD_CLIENT_CA_FILE			 185
 #define SSL_F_SSL_NEW					 186
+#define SSL_F_SSL_NEXT_PROTOS_PARSE			 298
 #define SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT	 287
 #define SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT		 290
 #define SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT	 289
@@ -1869,6 +1907,7 @@ void ERR_load_SSL_strings(void);
 #define SSL_F_TLS1_ENC					 210
 #define SSL_F_TLS1_SETUP_KEY_BLOCK			 211
 #define SSL_F_WRITE_PENDING				 212
+/* Next entry: 299 */
 
 /* Reason codes. */
 #define SSL_R_APP_DATA_IN_HANDSHAKE			 100
@@ -1939,6 +1978,8 @@ void ERR_load_SSL_strings(void);
 #define SSL_R_EXCESSIVE_MESSAGE_SIZE			 152
 #define SSL_R_EXTRA_DATA_IN_MESSAGE			 153
 #define SSL_R_GOT_A_FIN_BEFORE_A_CCS			 154
+#define SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS		 334
+#define SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION		 335
 #define SSL_R_HTTPS_PROXY_REQUEST			 155
 #define SSL_R_HTTP_REQUEST				 156
 #define SSL_R_ILLEGAL_PADDING				 283
@@ -2120,6 +2161,7 @@ void ERR_load_SSL_strings(void);
 #define SSL_R_WRONG_VERSION_NUMBER			 267
 #define SSL_R_X509_LIB					 268
 #define SSL_R_X509_VERIFICATION_SETUP_PROBLEMS		 269
+/* Next entry: 335 or 1115 */
 
 #ifdef  __cplusplus
 }
diff --git a/ssl/ssl3.h b/ssl/ssl3.h
index afbdd70..54b73b7 100644
--- a/ssl/ssl3.h
+++ b/ssl/ssl3.h
@@ -394,6 +394,9 @@ typedef struct ssl3_state_st
 
 	int in_read_app_data;
 
+	/* Set if we saw the Next Protocol Negotiation extension from our peer. */
+	int next_proto_neg_seen;
+
 	struct	{
 		/* actually only needs to be 16+20 */
 		unsigned char cert_verify_md[EVP_MAX_MD_SIZE*2];
@@ -484,6 +487,8 @@ typedef struct ssl3_state_st
 #define SSL3_ST_CW_CERT_VRFY_B		(0x191|SSL_ST_CONNECT)
 #define SSL3_ST_CW_CHANGE_A		(0x1A0|SSL_ST_CONNECT)
 #define SSL3_ST_CW_CHANGE_B		(0x1A1|SSL_ST_CONNECT)
+#define SSL3_ST_CW_NEXT_PROTO_A		(0x200|SSL_ST_CONNECT)
+#define SSL3_ST_CW_NEXT_PROTO_B		(0x201|SSL_ST_CONNECT)
 #define SSL3_ST_CW_FINISHED_A		(0x1B0|SSL_ST_CONNECT)
 #define SSL3_ST_CW_FINISHED_B		(0x1B1|SSL_ST_CONNECT)
 /* read from server */
@@ -529,6 +534,8 @@ typedef struct ssl3_state_st
 #define SSL3_ST_SR_CERT_VRFY_B		(0x1A1|SSL_ST_ACCEPT)
 #define SSL3_ST_SR_CHANGE_A		(0x1B0|SSL_ST_ACCEPT)
 #define SSL3_ST_SR_CHANGE_B		(0x1B1|SSL_ST_ACCEPT)
+#define SSL3_ST_SR_NEXT_PROTO_A		(0x210|SSL_ST_ACCEPT)
+#define SSL3_ST_SR_NEXT_PROTO_B		(0x211|SSL_ST_ACCEPT)
 #define SSL3_ST_SR_FINISHED_A		(0x1C0|SSL_ST_ACCEPT)
 #define SSL3_ST_SR_FINISHED_B		(0x1C1|SSL_ST_ACCEPT)
 /* write to client */
@@ -553,6 +560,7 @@ typedef struct ssl3_state_st
 #define SSL3_MT_CLIENT_KEY_EXCHANGE		16
 #define SSL3_MT_FINISHED			20
 #define SSL3_MT_CERTIFICATE_STATUS		22
+#define SSL3_MT_NEXT_PROTO			67
 #define DTLS1_MT_HELLO_VERIFY_REQUEST    3
 
 
diff --git a/ssl/ssl_err.c b/ssl/ssl_err.c
index 7eb5202..ff9c856 100644
--- a/ssl/ssl_err.c
+++ b/ssl/ssl_err.c
@@ -154,6 +154,7 @@ static ERR_STRING_DATA SSL_str_functs[]=
 {ERR_FUNC(SSL_F_SSL3_GET_KEY_EXCHANGE),	"SSL3_GET_KEY_EXCHANGE"},
 {ERR_FUNC(SSL_F_SSL3_GET_MESSAGE),	"SSL3_GET_MESSAGE"},
 {ERR_FUNC(SSL_F_SSL3_GET_NEW_SESSION_TICKET),	"SSL3_GET_NEW_SESSION_TICKET"},
+{ERR_FUNC(SSL_F_SSL3_GET_NEXT_PROTO),	"SSL3_GET_NEXT_PROTO"},
 {ERR_FUNC(SSL_F_SSL3_GET_RECORD),	"SSL3_GET_RECORD"},
 {ERR_FUNC(SSL_F_SSL3_GET_SERVER_CERTIFICATE),	"SSL3_GET_SERVER_CERTIFICATE"},
 {ERR_FUNC(SSL_F_SSL3_GET_SERVER_DONE),	"SSL3_GET_SERVER_DONE"},
@@ -220,6 +221,7 @@ static ERR_STRING_DATA SSL_str_functs[]=
 {ERR_FUNC(SSL_F_SSL_INIT_WBIO_BUFFER),	"SSL_INIT_WBIO_BUFFER"},
 {ERR_FUNC(SSL_F_SSL_LOAD_CLIENT_CA_FILE),	"SSL_load_client_CA_file"},
 {ERR_FUNC(SSL_F_SSL_NEW),	"SSL_new"},
+{ERR_FUNC(SSL_F_SSL_NEXT_PROTOS_PARSE),	"SSL_next_protos_parse"},
 {ERR_FUNC(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT),	"SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT"},
 {ERR_FUNC(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT),	"SSL_PARSE_CLIENTHELLO_TLSEXT"},
 {ERR_FUNC(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT),	"SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT"},
@@ -335,6 +337,8 @@ static ERR_STRING_DATA SSL_str_reasons[]=
 {ERR_REASON(SSL_R_EXCESSIVE_MESSAGE_SIZE),"excessive message size"},
 {ERR_REASON(SSL_R_EXTRA_DATA_IN_MESSAGE) ,"extra data in message"},
 {ERR_REASON(SSL_R_GOT_A_FIN_BEFORE_A_CCS),"got a fin before a ccs"},
+{ERR_REASON(SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS),"got next proto before a ccs"},
+{ERR_REASON(SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION),"got next proto without seeing extension"},
 {ERR_REASON(SSL_R_HTTPS_PROXY_REQUEST)   ,"https proxy request"},
 {ERR_REASON(SSL_R_HTTP_REQUEST)          ,"http request"},
 {ERR_REASON(SSL_R_ILLEGAL_PADDING)       ,"illegal padding"},
diff --git a/ssl/ssl_lib.c b/ssl/ssl_lib.c
index 96e056d..cfa70ec 100644
--- a/ssl/ssl_lib.c
+++ b/ssl/ssl_lib.c
@@ -323,6 +323,7 @@ SSL *SSL_new(SSL_CTX *ctx)
 	s->tlsext_ocsp_resplen = -1;
 	CRYPTO_add(&ctx->references,1,CRYPTO_LOCK_SSL_CTX);
 	s->initial_ctx=ctx;
+	s->next_proto_negotiated = NULL;
 #endif
 	s->verify_result=X509_V_OK;
 
@@ -532,6 +533,11 @@ void SSL_free(SSL *s)
 		kssl_ctx_free(s->kssl_ctx);
 #endif	/* OPENSSL_NO_KRB5 */
 
+#ifndef OPENSSL_NO_TLSEXT
+	if (s->next_proto_negotiated)
+		OPENSSL_free(s->next_proto_negotiated);
+#endif
+
 	OPENSSL_free(s);
 	}
 
@@ -1576,6 +1582,8 @@ SSL_CTX *SSL_CTX_new(SSL_METHOD *meth)
 	ret->tlsext_status_cb = 0;
 	ret->tlsext_status_arg = NULL;
 
+	ret->next_protos_advertised_cb = 0;
+	ret->next_proto_select_cb = 0;
 #endif
 
 #ifndef OPENSSL_NO_ENGINE
@@ -1677,6 +1685,7 @@ void SSL_CTX_free(SSL_CTX *a)
 	if (a->client_cert_engine)
 		ENGINE_finish(a->client_cert_engine);
 #endif
+
 	OPENSSL_free(a);
 	}
 
@@ -2752,6 +2761,123 @@ void SSL_set_msg_callback(SSL *ssl, void (*cb)(int write_p, int version, int con
 	SSL_callback_ctrl(ssl, SSL_CTRL_SET_MSG_CALLBACK, (void (*)(void))cb);
 	}
 
+#ifndef OPENSSL_NO_TLSEXT
+/* SSL_select_next_proto implements the standard protocol selection. It is
+ * expected that this function is called from the callback set by
+ * SSL_CTX_set_next_proto_select_cb.
+ *
+ * The protocol data is assumed to be a vector of 8-bit, length prefixed byte
+ * strings. The length byte itself is not included in the length. A byte
+ * string of length 0 is invalid. No byte string may be truncated.
+ *
+ * The current, but experimental algorithm for selecting the protocol is:
+ *
+ * 1) If the server doesn't support NPN then this is indicated to the
+ * callback. In this case, the client application has to abort the connection
+ * or have a default application level protocol.
+ *
+ * 2) If the server supports NPN, but advertises an empty list then the
+ * client selects the first protcol in its list, but indicates via the
+ * API that this fallback case was enacted.
+ *
+ * 3) Otherwise, the client finds the first protocol in the server's list
+ * that it supports and selects this protocol. This is because it's
+ * assumed that the server has better information about which protocol
+ * a client should use.
+ *
+ * 4) If the client doesn't support any of the server's advertised
+ * protocols, then this is treated the same as case 2.
+ *
+ * It returns either
+ * OPENSSL_NPN_NEGOTIATED if a common protocol was found, or
+ * OPENSSL_NPN_NO_OVERLAP if the fallback case was reached.
+ */
+int SSL_select_next_proto(unsigned char **out, unsigned char *outlen, const unsigned char *server, unsigned int server_len, const unsigned char *client, unsigned int client_len)
+	{
+	unsigned int i, j;
+	const unsigned char *result;
+	int status = OPENSSL_NPN_UNSUPPORTED;
+
+	/* For each protocol in server preference order, see if we support it. */
+	for (i = 0; i < server_len; )
+		{
+		for (j = 0; j < client_len; )
+			{
+			if (server[i] == client[j] &&
+			    memcmp(&server[i+1], &client[j+1], server[i]) == 0)
+				{
+				/* We found a match */
+				result = &server[i];
+				status = OPENSSL_NPN_NEGOTIATED;
+				goto found;
+				}
+			j += client[j];
+			j++;
+			}
+		i += server[i];
+		i++;
+		}
+
+	/* There's no overlap between our protocols and the server's list. */
+	result = client;
+	status = OPENSSL_NPN_NO_OVERLAP;
+
+	found:
+	*out = (unsigned char *) result + 1;
+	*outlen = result[0];
+	return status;
+	}
+
+/* SSL_get0_next_proto_negotiated sets *data and *len to point to the client's
+ * requested protocol for this connection and returns 0. If the client didn't
+ * request any protocol, then *data is set to NULL.
+ *
+ * Note that the client can request any protocol it chooses. The value returned
+ * from this function need not be a member of the list of supported protocols
+ * provided by the callback.
+ */
+void SSL_get0_next_proto_negotiated(const SSL *s, const unsigned char **data, unsigned *len)
+	{
+	*data = s->next_proto_negotiated;
+	if (!*data) {
+		*len = 0;
+	} else {
+		*len = s->next_proto_negotiated_len;
+	}
+}
+
+/* SSL_CTX_set_next_protos_advertised_cb sets a callback that is called when a
+ * TLS server needs a list of supported protocols for Next Protocol
+ * Negotiation. The returned list must be in wire format.  The list is returned
+ * by setting |out| to point to it and |outlen| to its length. This memory will
+ * not be modified, but one should assume that the SSL* keeps a reference to
+ * it.
+ *
+ * The callback should return SSL_TLSEXT_ERR_OK if it wishes to advertise. Otherwise, no
+ * such extension will be included in the ServerHello. */
+void SSL_CTX_set_next_protos_advertised_cb(SSL_CTX *ctx, int (*cb) (SSL *ssl, const unsigned char **out, unsigned int *outlen, void *arg), void *arg)
+	{
+	ctx->next_protos_advertised_cb = cb;
+	ctx->next_protos_advertised_cb_arg = arg;
+	}
+
+/* SSL_CTX_set_next_proto_select_cb sets a callback that is called when a
+ * client needs to select a protocol from the server's provided list. |out|
+ * must be set to point to the selected protocol (which may be within |in|).
+ * The length of the protocol name must be written into |outlen|. The server's
+ * advertised protocols are provided in |in| and |inlen|. The callback can
+ * assume that |in| is syntactically valid.
+ *
+ * The client must select a protocol. It is fatal to the connection if this
+ * callback returns a value other than SSL_TLSEXT_ERR_OK.
+ */
+void SSL_CTX_set_next_proto_select_cb(SSL_CTX *ctx, int (*cb) (SSL *s, unsigned char **out, unsigned char *outlen, const unsigned char *in, unsigned int inlen, void *arg), void *arg)
+	{
+	ctx->next_proto_select_cb = cb;
+	ctx->next_proto_select_cb_arg = arg;
+	}
+#endif
+
 int SSL_cutthrough_complete(const SSL *s)
 	{
 	return (!s->server &&                 /* cutthrough only applies to clients */
diff --git a/ssl/ssl_locl.h b/ssl/ssl_locl.h
index e305db4..a9183ff 100644
--- a/ssl/ssl_locl.h
+++ b/ssl/ssl_locl.h
@@ -895,6 +895,7 @@ int ssl3_get_server_certificate(SSL *s);
 int ssl3_check_cert_and_algorithm(SSL *s);
 #ifndef OPENSSL_NO_TLSEXT
 int ssl3_check_finished(SSL *s);
+int ssl3_send_next_proto(SSL *s);
 #endif
 
 int dtls1_client_hello(SSL *s);
@@ -913,6 +914,7 @@ int ssl3_check_client_hello(SSL *s);
 int ssl3_get_client_certificate(SSL *s);
 int ssl3_get_client_key_exchange(SSL *s);
 int ssl3_get_cert_verify(SSL *s);
+int ssl3_get_next_proto(SSL *s);
 
 int dtls1_send_hello_request(SSL *s);
 int dtls1_send_server_hello(SSL *s);
diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index 8b53112..fd35b18 100644
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -271,6 +271,16 @@ unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned cha
 			i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
 		}
 
+	if (s->ctx->next_proto_select_cb)
+		{
+		/* The client advertises an emtpy extension to indicate its
+		 * support for Next Protocol Negotiation */
+		if (limit - ret - 4 < 0)
+			return NULL;
+		s2n(TLSEXT_TYPE_next_proto_neg,ret);
+		s2n(0,ret);
+		}
+
 	if ((extdatalen = ret-p-2)== 0) 
 		return p;
 
@@ -282,6 +292,7 @@ unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned cha
 	{
 	int extdatalen=0;
 	unsigned char *ret = p;
+	char next_proto_neg_seen;
 
 	/* don't add extensions for SSLv3, unless doing secure renegotiation */
 	if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
@@ -337,6 +348,26 @@ unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned cha
 		s2n(0,ret);
 		}
 
+	next_proto_neg_seen = s->s3->next_proto_neg_seen;
+	s->s3->next_proto_neg_seen = 0;
+	if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb)
+		{
+		const unsigned char *npa;
+		unsigned int npalen;
+		int r;
+
+		r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, s->ctx->next_protos_advertised_cb_arg);
+		if (r == SSL_TLSEXT_ERR_OK)
+			{
+			if ((long)(limit - ret - 4 - npalen) < 0) return NULL;
+			s2n(TLSEXT_TYPE_next_proto_neg,ret);
+			s2n(npalen,ret);
+			memcpy(ret, npa, npalen);
+			ret += npalen;
+			s->s3->next_proto_neg_seen = 1;
+			}
+		}
+
 	if ((extdatalen = ret-p-2)== 0) 
 		return p;
 
@@ -576,6 +607,25 @@ int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in
 				else
 					s->tlsext_status_type = -1;
 			}
+		else if (type == TLSEXT_TYPE_next_proto_neg)
+			{
+			/* We shouldn't accept this extension on a
+			 * renegotiation, but we currently do.
+			 *
+			 * s->new_session will be set on renegotiation, but we
+			 * probably shouldn't rely that it couldn't be set on
+			 * the initial renegotation too in certain cases (when
+			 * there's some other reason to disallow resuming an
+			 * earlier session -- the current code won't be doing
+			 * anything like that, but this might change).
+
+			 * A valid sign that there's been a previous handshake
+			 * in this connection is if s->s3->tmp.finish_md_len >
+			 * 0.  (We are talking about a check that will happen
+			 * in the Hello protocol round, well before a new
+			 * Finished message could have been computed.) */
+			s->s3->next_proto_neg_seen = 1;
+			}
 
 		/* session ticket processed earlier */
 
@@ -599,6 +649,24 @@ int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in
 	return 1;
 	}
 
+/* ssl_next_proto_validate validates a Next Protocol Negotiation block. No
+ * elements of zero length are allowed and the set of elements must exactly fill
+ * the length of the block. */
+static char ssl_next_proto_validate(unsigned char *d, unsigned len)
+	{
+	unsigned int off = 0;
+
+	while (off < len)
+		{
+		if (d[off] == 0)
+			return 0;
+		off += d[off];
+		off++;
+		}
+
+	return off == len;
+	}
+
 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
 	{
 	unsigned short type;
@@ -658,6 +726,37 @@ int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in
 			/* Set flag to expect CertificateStatus message */
 			s->tlsext_status_expected = 1;
 			}
+		else if (type == TLSEXT_TYPE_next_proto_neg)
+			{
+			unsigned char *selected;
+			unsigned char selected_len;
+
+			/* We must have requested it. */
+			if ((s->ctx->next_proto_select_cb == NULL))
+				{
+				*al = TLS1_AD_UNSUPPORTED_EXTENSION;
+				return 0;
+				}
+			/* The data must be valid */
+			if (!ssl_next_proto_validate(data, size))
+				{
+				*al = TLS1_AD_DECODE_ERROR;
+				return 0;
+				}
+			if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK)
+				{
+				*al = TLS1_AD_INTERNAL_ERROR;
+				return 0;
+				}
+			s->next_proto_negotiated = OPENSSL_malloc(selected_len);
+			if (!s->next_proto_negotiated)
+				{
+				*al = TLS1_AD_INTERNAL_ERROR;
+				return 0;
+				}
+			memcpy(s->next_proto_negotiated, selected, selected_len);
+			s->next_proto_negotiated_len = selected_len;
+			}
 		else if (type == TLSEXT_TYPE_renegotiate)
 			{
 			if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
diff --git a/ssl/tls1.h b/ssl/tls1.h
index afe4807..71d76de 100644
--- a/ssl/tls1.h
+++ b/ssl/tls1.h
@@ -118,6 +118,9 @@ extern "C" {
 /* Temporary extension type */
 #define TLSEXT_TYPE_renegotiate                 0xff01
 
+/* This is not an IANA defined extension number */
+#define TLSEXT_TYPE_next_proto_neg		13172
+
 /* NameType value from RFC 3546 */
 #define TLSEXT_NAMETYPE_host_name 0
 /* status request value from RFC 3546 */