Add ALPN support patch
This change adds support for ALPN[1] in OpenSSL. ALPN is the IETF
blessed version of NPN and we'll be supporting both ALPN and NPN for
some time yet.
[1] https://tools.ietf.org/html/draft-ietf-tls-applayerprotoneg-00
Patch from Adam Langley <agl@chromium.org>
Change-Id: I556b1ee877f398ae8b7f1d4abbaddc44611e5f51
diff --git a/ssl/ssl_lib.c b/ssl/ssl_lib.c
index 6382325..1a3ceea 100644
--- a/ssl/ssl_lib.c
+++ b/ssl/ssl_lib.c
@@ -360,6 +360,17 @@
# ifndef OPENSSL_NO_NEXTPROTONEG
s->next_proto_negotiated = NULL;
# endif
+
+ if (s->ctx->alpn_client_proto_list)
+ {
+ s->alpn_client_proto_list =
+ OPENSSL_malloc(s->ctx->alpn_client_proto_list_len);
+ if (s->alpn_client_proto_list == NULL)
+ goto err;
+ memcpy(s->alpn_client_proto_list, s->ctx->alpn_client_proto_list,
+ s->ctx->alpn_client_proto_list_len);
+ s->alpn_client_proto_list_len = s->ctx->alpn_client_proto_list_len;
+ }
#endif
s->verify_result=X509_V_OK;
@@ -581,6 +592,8 @@
OPENSSL_free(s->tlsext_ocsp_resp);
if (s->tlsext_channel_id_private)
EVP_PKEY_free(s->tlsext_channel_id_private);
+ if (s->alpn_client_proto_list)
+ OPENSSL_free(s->alpn_client_proto_list);
#endif
if (s->client_CA != NULL)
@@ -1658,6 +1671,78 @@
ctx->next_proto_select_cb_arg = arg;
}
# endif
+
+/* SSL_CTX_set_alpn_protos sets the ALPN protocol list on |ctx| to |protos|.
+ * |protos| must be in wire-format (i.e. a series of non-empty, 8-bit
+ * length-prefixed strings).
+ *
+ * Returns 0 on success. */
+int SSL_CTX_set_alpn_protos(SSL_CTX *ctx, const unsigned char* protos,
+ unsigned protos_len)
+ {
+ if (ctx->alpn_client_proto_list)
+ OPENSSL_free(ctx->alpn_client_proto_list);
+
+ ctx->alpn_client_proto_list = OPENSSL_malloc(protos_len);
+ if (!ctx->alpn_client_proto_list)
+ return 1;
+ memcpy(ctx->alpn_client_proto_list, protos, protos_len);
+ ctx->alpn_client_proto_list_len = protos_len;
+
+ return 0;
+ }
+
+/* SSL_set_alpn_protos sets the ALPN protocol list on |ssl| to |protos|.
+ * |protos| must be in wire-format (i.e. a series of non-empty, 8-bit
+ * length-prefixed strings).
+ *
+ * Returns 0 on success. */
+int SSL_set_alpn_protos(SSL *ssl, const unsigned char* protos,
+ unsigned protos_len)
+ {
+ if (ssl->alpn_client_proto_list)
+ OPENSSL_free(ssl->alpn_client_proto_list);
+
+ ssl->alpn_client_proto_list = OPENSSL_malloc(protos_len);
+ if (!ssl->alpn_client_proto_list)
+ return 1;
+ memcpy(ssl->alpn_client_proto_list, protos, protos_len);
+ ssl->alpn_client_proto_list_len = protos_len;
+
+ return 0;
+ }
+
+/* SSL_CTX_set_alpn_select_cb sets a callback function on |ctx| that is called
+ * during ClientHello processing in order to select an ALPN protocol from the
+ * client's list of offered protocols. */
+void SSL_CTX_set_alpn_select_cb(SSL_CTX* ctx,
+ int (*cb) (SSL *ssl,
+ const unsigned char **out,
+ unsigned char *outlen,
+ const unsigned char *in,
+ unsigned int inlen,
+ void *arg),
+ void *arg)
+ {
+ ctx->alpn_select_cb = cb;
+ ctx->alpn_select_cb_arg = arg;
+ }
+
+/* SSL_get0_alpn_selected gets the selected ALPN protocol (if any) from |ssl|.
+ * On return it sets |*data| to point to |*len| bytes of protocol name (not
+ * including the leading length-prefix byte). If the server didn't respond with
+ * a negotiated protocol then |*len| will be zero. */
+void SSL_get0_alpn_selected(const SSL *ssl, const unsigned char **data,
+ unsigned *len)
+ {
+ *data = NULL;
+ if (ssl->s3)
+ *data = ssl->s3->alpn_selected;
+ if (*data == NULL)
+ *len = 0;
+ else
+ *len = ssl->s3->alpn_selected_len;
+ }
#endif
int SSL_export_keying_material(SSL *s, unsigned char *out, size_t olen,
@@ -2010,6 +2095,8 @@
#ifndef OPENSSL_NO_TLSEXT
if (a->tlsext_channel_id_private)
EVP_PKEY_free(a->tlsext_channel_id_private);
+ if (a->alpn_client_proto_list != NULL)
+ OPENSSL_free(a->alpn_client_proto_list);
#endif
OPENSSL_free(a);