1 files changed, 125 insertions, 0 deletions
diff --git a/src/tls.cc b/src/tls.cc
new file mode 100644
index 0000000..e88dc56
--- /dev/null
+++ b/src/tls.cc
@@ -0,0 +1,125 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2014 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include "tls.h"
+
+#include <cassert>
+#include <vector>
+#include <mutex>
+#include <iostream>
+
+#include <openssl/crypto.h>
+#include <openssl/conf.h>
+
+#include "ssl_compat.h"
+
+namespace nghttp2 {
+
+namespace tls {
+
+const char *get_tls_protocol(SSL *ssl) {
+  switch (SSL_version(ssl)) {
+  case SSL2_VERSION:
+    return "SSLv2";
+  case SSL3_VERSION:
+    return "SSLv3";
+#ifdef TLS1_3_VERSION
+  case TLS1_3_VERSION:
+    return "TLSv1.3";
+#endif // TLS1_3_VERSION
+  case TLS1_2_VERSION:
+    return "TLSv1.2";
+  case TLS1_1_VERSION:
+    return "TLSv1.1";
+  case TLS1_VERSION:
+    return "TLSv1";
+  default:
+    return "unknown";
+  }
+}
+
+TLSSessionInfo *get_tls_session_info(TLSSessionInfo *tls_info, SSL *ssl) {
+  if (!ssl) {
+    return nullptr;
+  }
+
+  auto session = SSL_get_session(ssl);
+  if (!session) {
+    return nullptr;
+  }
+
+  tls_info->cipher = SSL_get_cipher_name(ssl);
+  tls_info->protocol = get_tls_protocol(ssl);
+  tls_info->session_reused = SSL_session_reused(ssl);
+
+  unsigned int session_id_length;
+  tls_info->session_id = SSL_SESSION_get_id(session, &session_id_length);
+  tls_info->session_id_length = session_id_length;
+
+  return tls_info;
+}
+
+/* Conditional logic w/ lookup tables to check if id is one of the
+   the block listed cipher suites for HTTP/2 described in RFC 7540.
+   https://github.com/jay/http2_blacklisted_ciphers
+*/
+#define IS_CIPHER_BANNED_METHOD2(id)                                           \
+  ((0x0000 <= id && id <= 0x00FF &&                                            \
+    "\xFF\xFF\xFF\xCF\xFF\xFF\xFF\xFF\x7F\x00\x00\x00\x80\x3F\x00\x00"         \
+    "\xF0\xFF\xFF\x3F\xF3\xF3\xFF\xFF\x3F\x00\x00\x00\x00\x00\x00\x80"         \
+            [(id & 0xFF) / 8] &                                                \
+        (1 << (id % 8))) ||                                                    \
+   (0xC000 <= id && id <= 0xC0FF &&                                            \
+    "\xFE\xFF\xFF\xFF\xFF\x67\xFE\xFF\xFF\xFF\x33\xCF\xFC\xCF\xFF\xCF"         \
+    "\x3C\xF3\xFC\x3F\x33\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"         \
+            [(id & 0xFF) / 8] &                                                \
+        (1 << (id % 8))))
+
+bool check_http2_cipher_block_list(SSL *ssl) {
+  int id = SSL_CIPHER_get_id(SSL_get_current_cipher(ssl)) & 0xFFFFFF;
+
+  return IS_CIPHER_BANNED_METHOD2(id);
+}
+
+bool check_http2_tls_version(SSL *ssl) {
+  auto tls_ver = SSL_version(ssl);
+
+  return tls_ver >= TLS1_2_VERSION;
+}
+
+bool check_http2_requirement(SSL *ssl) {
+  return check_http2_tls_version(ssl) && !check_http2_cipher_block_list(ssl);
+}
+
+int ssl_ctx_set_proto_versions(SSL_CTX *ssl_ctx, int min, int max) {
+  if (SSL_CTX_set_min_proto_version(ssl_ctx, min) != 1 ||
+      SSL_CTX_set_max_proto_version(ssl_ctx, max) != 1) {
+    return -1;
+  }
+  return 0;
+}
+
+} // namespace tls
+
+} // namespace nghttp2