From 7b2f3298f7eb7ce5cfd1c3eb55b1ecc89118f52c Mon Sep 17 00:00:00 2001
From: jsing <>
Date: Wed, 10 Dec 2014 15:24:01 +0000
Subject: Add ALPN support to openssl(1).

Based on OpenSSL.
---
 src/usr.bin/openssl/s_server.c | 74 +++++++++++++++++++++++++++++++++++++-----
 1 file changed, 65 insertions(+), 9 deletions(-)

(limited to 'src/usr.bin/openssl/s_server.c')

diff --git a/src/usr.bin/openssl/s_server.c b/src/usr.bin/openssl/s_server.c
index b3cdb30a61..35ed6d169c 100644
--- a/src/usr.bin/openssl/s_server.c
+++ b/src/usr.bin/openssl/s_server.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: s_server.c,v 1.7 2014/12/02 19:44:49 deraadt Exp $ */
+/* $OpenBSD: s_server.c,v 1.8 2014/12/10 15:24:01 jsing Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -351,6 +351,7 @@ sv_usage(void)
 #ifndef OPENSSL_NO_NEXTPROTONEG
 	BIO_printf(bio_err, " -nextprotoneg arg - set the advertised protocols for the NPN extension (comma-separated list)\n");
 #endif
+	BIO_printf(bio_err," -alpn arg  - set the advertised protocols for the ALPN extension (comma-separated list)\n");
 #ifndef OPENSSL_NO_SRTP
 	BIO_printf(bio_err, " -use_srtp profiles - Offer SRTP key management with a colon-separated profile list\n");
 #endif
@@ -545,6 +546,45 @@ next_proto_cb(SSL * s, const unsigned char **data, unsigned int *len, void *arg)
 #endif				/* ndef OPENSSL_NO_NEXTPROTONEG */
 
 
+/* This the context that we pass to alpn_cb */
+typedef struct tlsextalpnctx_st {
+	unsigned char *data;
+	unsigned short len;
+} tlsextalpnctx;
+
+static int
+alpn_cb(SSL *s, const unsigned char **out, unsigned char *outlen,
+    const unsigned char *in, unsigned int inlen, void *arg)
+{
+	tlsextalpnctx *alpn_ctx = arg;
+
+	if (!s_quiet) {
+		/* We can assume that in is syntactically valid. */
+		unsigned i;
+
+		BIO_printf(bio_s_out,
+		    "ALPN protocols advertised by the client: ");
+		for (i = 0; i < inlen; ) {
+			if (i)
+				BIO_write(bio_s_out, ", ", 2);
+			BIO_write(bio_s_out, &in[i + 1], in[i]);
+			i += in[i] + 1;
+		}
+		BIO_write(bio_s_out, "\n", 1);
+	}
+
+	if (SSL_select_next_proto((unsigned char**)out, outlen, alpn_ctx->data,
+	    alpn_ctx->len, in, inlen) != OPENSSL_NPN_NEGOTIATED)
+		return (SSL_TLSEXT_ERR_NOACK);
+
+	if (!s_quiet) {
+		BIO_printf(bio_s_out, "ALPN protocols selected: ");
+		BIO_write(bio_s_out, *out, *outlen);
+		BIO_write(bio_s_out, "\n", 1);
+	}
+
+	return (SSL_TLSEXT_ERR_OK);
+}
 
 int s_server_main(int, char **);
 
@@ -583,8 +623,10 @@ s_server_main(int argc, char *argv[])
 	tlsextctx tlsextcbp = {NULL, NULL, SSL_TLSEXT_ERR_ALERT_WARNING};
 #ifndef OPENSSL_NO_NEXTPROTONEG
 	const char *next_proto_neg_in = NULL;
-	tlsextnextprotoctx next_proto;
+	tlsextnextprotoctx next_proto = { NULL, 0 };
 #endif
+	const char *alpn_in = NULL;
+	tlsextalpnctx alpn_ctx = { NULL, 0 };
 	meth = SSLv23_server_method();
 
 	local_argc = argc;
@@ -838,6 +880,11 @@ s_server_main(int argc, char *argv[])
 			next_proto_neg_in = *(++argv);
 		}
 #endif
+		else if	(strcmp(*argv,"-alpn") == 0) {
+			if (--argc < 1)
+				goto bad;
+			alpn_in = *(++argv);
+		}
 #ifndef OPENSSL_NO_SRTP
 		else if (strcmp(*argv, "-use_srtp") == 0) {
 			if (--argc < 1)
@@ -916,7 +963,7 @@ bad:
 			}
 		}
 	}
-#if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
+#if !defined(OPENSSL_NO_NEXTPROTONEG)
 	if (next_proto_neg_in) {
 		unsigned short len;
 		next_proto.data = next_protos_parse(&len, next_proto_neg_in);
@@ -927,7 +974,14 @@ bad:
 		next_proto.data = NULL;
 	}
 #endif
-
+	alpn_ctx.data = NULL;
+	if (alpn_in) {
+		unsigned short len;
+		alpn_ctx.data = next_protos_parse(&len, alpn_in);
+		if (alpn_ctx.data == NULL)
+			goto end;
+		alpn_ctx.len = len;
+	}
 
 	if (s_dcert_file) {
 
@@ -957,8 +1011,7 @@ bad:
 				bio_s_out = BIO_new_fp(stdout, BIO_NOCLOSE);
 		}
 	}
-	if (nocert)
-	{
+	if (nocert) {
 		s_cert_file = NULL;
 		s_key_file = NULL;
 		s_dcert_file = NULL;
@@ -1076,6 +1129,8 @@ bad:
 	if (next_proto.data)
 		SSL_CTX_set_next_protos_advertised_cb(ctx, next_proto_cb, &next_proto);
 #endif
+	if (alpn_ctx.data)
+		SSL_CTX_set_alpn_select_cb(ctx, alpn_cb, &alpn_ctx);
 
 #ifndef OPENSSL_NO_DH
 	if (!no_dhe) {
@@ -1241,6 +1296,8 @@ end:
 		X509_free(s_cert2);
 	if (s_key2)
 		EVP_PKEY_free(s_key2);
+	free(next_proto.data);
+	free(alpn_ctx.data);
 	if (bio_s_out != NULL) {
 		BIO_free(bio_s_out);
 		bio_s_out = NULL;
@@ -1603,13 +1660,12 @@ init_ssl_connection(SSL * con)
 	X509 *peer;
 	long verify_error;
 	char buf[BUFSIZ];
-#if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
+#if !defined(OPENSSL_NO_NEXTPROTONEG)
 	const unsigned char *next_proto_neg;
 	unsigned next_proto_neg_len;
 #endif
 	unsigned char *exportedkeymat;
 
-
 	i = SSL_accept(con);
 	if (i <= 0) {
 		if (BIO_sock_should_retry(i)) {
@@ -1642,7 +1698,7 @@ init_ssl_connection(SSL * con)
 	str = SSL_CIPHER_get_name(SSL_get_current_cipher(con));
 	BIO_printf(bio_s_out, "CIPHER is %s\n", (str != NULL) ? str : "(NONE)");
 
-#if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
+#if !defined(OPENSSL_NO_NEXTPROTONEG)
 	SSL_get0_next_proto_negotiated(con, &next_proto_neg, &next_proto_neg_len);
 	if (next_proto_neg) {
 		BIO_printf(bio_s_out, "NEXTPROTO is ");
-- 
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