ws_ssl example

examples/ws_ssl/Makefile

+# Copyright (c) 2014 Cesanta Software
+# All rights reserved
+
+CFLAGS = -W -Wall -I../.. -g -O0 $(CFLAGS_EXTRA)
+NS = ../../../net_skeleton
+SW = ../../../ssl_wrapper
+
+SOURCES = ws_ssl.c ../../mongoose.c $(NS)/net_skeleton.c $(SW)/ssl_wrapper.c
+PROG = ws_ssl
+
+unix: $(SOURCES)
+	$(CC) -o $(PROG) $(SOURCES) \
+		-I$(NS) -DNS_ENABLE_SSL -DNOEMBED_NET_SKELETON \
+		-I$(SW) -DSSL_WRAPPER_USE_AS_LIBRARY -lssl $(CFLAGS)
+
+clean:
+	rm -rf $(PROG) *.exe *.dSYM *.obj *.exp .*o *.lib

examples/ws_ssl/certs/ws1_ca.pem

+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----
+-----BEGIN CERTIFICATE-----
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+ZpIpwqRCysg=
+-----END CERTIFICATE-----

examples/ws_ssl/certs/ws1_client.pem

+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

examples/ws_ssl/certs/ws1_server.pem

+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

examples/ws_ssl/certs/ws2_ca.pem

+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----
+-----BEGIN CERTIFICATE-----
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+HUaOcNC90ew=
+-----END CERTIFICATE-----

examples/ws_ssl/certs/ws2_client.pem

+-----BEGIN RSA PRIVATE KEY-----
+MIIEpAIBAAKCAQEA0ucemqFwBFziVOgTgx4mZII4WnGDpA/rWAGHvUZOqy2dQ3Pz
+woGKxBaVPAl5kxEosROVGa7dTuq5yFZ4XIGvwCKxF30vCmdGCytqq6MMp904jG32
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+OuVLkqpZzWuye/QCH5NOTfw27ye8jG8VcQW2QPbcbkLXLM7zg2yX7g==
+-----END RSA PRIVATE KEY-----
+-----BEGIN CERTIFICATE-----
+MIIC7DCCAdQCBRQHBXNJMA0GCSqGSIb3DQEBBQUAMDoxDDAKBgNVBAMTA3dzMjEM
+MAoGA1UEChMDd3MyMQswCQYDVQQGEwJJRTEPMA0GA1UEBxMGRHVibGluMB4XDTE0
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+XijwHT/o8E9ddH2BvDv+6Nhno9C6/MbezEOIs4nlhRk=
+-----END CERTIFICATE-----

examples/ws_ssl/certs/ws2_server.pem

+-----BEGIN RSA PRIVATE KEY-----
+MIIEpQIBAAKCAQEA29iFnMf4pjty6knOt4wT0joPUlU2dGCFWxQ5Eg77Yx3Lou2a
+FOzNGp7zLYH8gauOK+mgY+B9cBv8PvVtUQQKB0SKTTV8ZNKVyP3O5F2gRSJ+tHtT
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+iBpIHIBASNCN3sqeq+VqXvavRmeZh5O0vyLP46/kxZx0rzR/NCi9xxU=
+-----END RSA PRIVATE KEY-----
+-----BEGIN CERTIFICATE-----
+MIIC7DCCAdQCBRQHBXNIMA0GCSqGSIb3DQEBBQUAMDoxDDAKBgNVBAMTA3dzMjEM
+MAoGA1UEChMDd3MyMQswCQYDVQQGEwJJRTEPMA0GA1UEBxMGRHVibGluMB4XDTE0
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+iZtzp+NzzLnEnWMNs+fJpPJ96P0kbq2bQzuSBcUynq0=
+-----END CERTIFICATE-----

examples/ws_ssl/ws_ssl.c

+// Copyright (c) 2014 Cesanta Software
+// All rights reserved
+//
+// This example demostrates proxying of WebSocket traffic, regardless of the
+// protocol (ws:// or wss://).
+// To use this example:
+//    1. configure your browser to use a proxy on port 2014
+//    2. import certs/ws1_ca.pem and certs/ws2_ca.pem into the trusted
+//       certificates list on your browser
+//    3. make && ./ws_ssl
+//    4. Point your browser to http://ws_ssl.com
+//  A page with 4 sections should appear, showing websocket echoes
+
+#include "net_skeleton.h"
+#include "mongoose.h"
+#include "ssl_wrapper.h"
+
+struct config {
+  const char *requested_host;   // Host name that client uses
+  struct ssl_wrapper_config c;
+};
+
+static struct config s_wrappers[] = {
+  {"ws1", {"127.0.0.1", 9001, 0, NULL, "7001", NULL}},
+  {"ws1", {"127.0.0.1", 9001, 0, NULL, "7002", "certs/ws1_server.pem"}},
+  {"ws2", {"127.0.0.1", 9002, 1, NULL, "7003", NULL}},
+  {"ws2", {"127.0.0.1", 9002, 1, NULL, "7004", "certs/ws2_server.pem"}}
+};
+static int s_received_signal = 0;
+
+static void signal_handler(int sig_num) {
+  signal(sig_num, signal_handler);
+  s_received_signal = sig_num;
+}
+
+static int ev_handler(struct mg_connection *conn, enum mg_event ev) {
+  switch (ev) {
+    case MG_AUTH:
+      return MG_TRUE;
+
+    case MG_REQUEST:
+      printf("==> [%s] [%s]\n", conn->request_method, conn->uri);
+      if (strcmp(conn->request_method, "CONNECT") == 0) {
+        char host[1025] = "";
+        int i, is_ssl, port = 0;
+        
+        sscanf(conn->uri, "%1024[^:]:%d", host, &port);
+        is_ssl = (port == 443 ? 1 : 0);
+
+        // Iterate over existing wrapper, see if we can use one of them
+        for (i = 0; i < (int) ARRAY_SIZE(s_wrappers); i++) {
+          if (strcmp(host, s_wrappers[i].requested_host) == 0 &&
+              is_ssl == (s_wrappers[i].c.ssl_cert == NULL ? 0 : 1)) {
+            // Found usable wrapper, tunnel to it.
+            mg_forward(conn, "127.0.0.1",
+              atoi(s_wrappers[i].c.listening_port), 0);
+            return MG_MORE;
+          }
+        }
+
+        // No suitable wrappers found. Disallow that CONNECT request.
+        mg_send_status(conn, 405);
+        return MG_TRUE;
+      }
+
+      // Not a CONNECT request, serve HTML file.
+      mg_send_file(conn, "ws_ssl.html");
+      return MG_MORE;
+
+    default:
+      return MG_FALSE;
+  }
+}
+
+static int ws_handler(struct mg_connection *conn, enum mg_event ev) {
+  switch (ev) {
+    case MG_AUTH:
+      return MG_TRUE;
+    case MG_REQUEST:
+      if (conn->is_websocket) {
+        // Simple websocket echo server
+        mg_websocket_write(conn, WEBSOCKET_OPCODE_TEXT,
+                           conn->content, conn->content_len);
+      } else {
+        mg_printf_data(conn, "%s", "websocket connection expected");
+      }
+      return MG_TRUE;
+    default:
+      return MG_FALSE;
+  }
+}
+
+static void *serve_thread_func(void *param) {
+  struct mg_server *server = (struct mg_server *) param;
+  printf("Listening on port %s\n", mg_get_option(server, "listening_port"));
+  while (s_received_signal == 0) {
+    mg_poll_server(server, 1000);
+  }
+  mg_destroy_server(&server);
+  return NULL;
+}
+
+static void *wrapper_thread_func(void *param) {
+  ssl_wrapper_serve(&((struct config *) param)->c, &s_received_signal);
+  return NULL;
+}
+
+int main(void) {
+  struct mg_server *proxy_server = mg_create_server(NULL, ev_handler);
+  struct mg_server *ws1_server = mg_create_server(NULL, ws_handler);
+  struct mg_server *ws2_server = mg_create_server(NULL, ws_handler);
+  size_t i;
+
+  // Configure proxy server to listen on port 2014
+  mg_set_option(proxy_server, "listening_port", "2014");
+  //mg_set_option(proxy_server, "enable_proxy", "yes");
+
+  // Configure two websocket echo servers:
+  //    ws1 is WS, listening on 9001
+  //    ws2 is WSS, listening on 9002
+  // Note that HTML page thinks that ws1 is WSS, and ws2 is WS,
+  // where in reality it is vice versa and proxy server makes the decision.
+  mg_set_option(ws1_server, "listening_port", "9001");
+  mg_set_option(ws2_server, "listening_port", "9002");
+  mg_set_option(ws2_server, "ssl_certificate", "certs/ws2_server.pem");
+
+  // Setup signal handlers
+  signal(SIGTERM, signal_handler);
+  signal(SIGINT, signal_handler);
+  
+  // Start SSL wrappers, each in it's own thread
+  for (i = 0; i < ARRAY_SIZE(s_wrappers); i++) {
+    ns_start_thread(wrapper_thread_func, &s_wrappers[i]);
+  }
+
+  // Start websocket servers in separate threads
+  mg_start_thread(serve_thread_func, ws1_server);
+  mg_start_thread(serve_thread_func, ws2_server);
+  
+  // Finally, start proxy server in this thread: this call blocks
+  serve_thread_func(proxy_server);
+
+  printf("Existing on signal %d\n", s_received_signal);
+  return EXIT_SUCCESS;
+}

examples/ws_ssl/ws_ssl.html

+<html>
+<head>
+  <title>Websocket Proxy SSL Test</title>
+  <meta charset="utf-8">
+  <script>
+  window.onload = function() {
+    var protocols = ['ws://', 'wss://'];
+    var websocketServers = ['ws1', 'ws2'];
+    
+    var createWebsocketConnection = function(proto, server) {
+      var conn = new WebSocket(proto + server);
+
+      var div = document.createElement('div');
+      var h2 = document.createElement('h2');
+      h2.innerHTML = 'Connection to ' + proto + server;
+      document.body.appendChild(h2);
+      document.body.appendChild(div);
+
+      conn.onmessage = function(ev) {
+        var el = document.createElement('div');
+        el.innerHTML = 'websocket message: ' + ev.data;
+        div.appendChild(el);
+        // Keep only last 5 messages in the list
+        while (div.childNodes.length > 5) div.removeChild(div.firstChild);
+      };
+
+      // Send some string to the websocket connection periodically.
+      // websocket server much echo it back.
+      window.setInterval(function() { conn.send(Math.random()); }, 1000);
+    };
+
+    for (var i = 0; i < protocols.length; i++) {
+      for (var j = 0; j < websocketServers.length; j++) {
+        createWebsocketConnection(protocols[i], websocketServers[j]);
+      }
+    }
+  };
+  </script>
+  <style>
+    body > div {
+      border: 1px solid #ccc; background: #f0f0f0; padding: 0 1em;
+      margin: 0 2em; min-height: 4em; max-width: 40em;
+    }
+  </style>
+</head>
+<body>
+</body>
+</html>
\ No newline at end of file