Implement remote assistance

- It enables a VPN via n2n
- Remote assistance will be automatically disabled after 1 day
- Optionally it's possible to give admin access to the support

scripts/lua/admin/remote_assistance.lua

@@ -0,0 +1,140 @@
+--
+-- (C) 2018 - ntop.org
+--
+
+local dirs = ntop.getDirs()
+package.path = dirs.installdir .. "/scripts/lua/modules/?.lua;" .. package.path
+require "lua_utils"
+local remote_assistance = require("remote_assistance")
+
+if((not isAdministrator()) or (not remote_assistance.isAvailable())) then
+  return
+end
+
+local info = ntop.getInfo()
+
+if not table.empty(_POST) then
+  local enabled = (_POST["toggle_remote_assistance"] == "1") and (_POST["accept_tos"] == "1")
+
+  if enabled then
+    local admin_access = _POST["allow_admin_access"]
+    local community = _POST["assistance_key"]
+    local key = community
+
+    if admin_access == "1" then
+      remote_assistance.enableTempAdminAccess(key)
+    else
+      remote_assistance.disableTempAdminAccess()
+    end
+
+    ntop.setPref("ntopng.prefs.remote_assistance.community", community)
+    ntop.setPref("ntopng.prefs.remote_assistance.key", key)
+    ntop.setPref("ntopng.prefs.remote_assistance.admin_access", admin_access or "0")
+    remote_assistance.createConfig(community, key)
+    remote_assistance.enableAndStart()
+  else
+    remote_assistance.disableTempAdminAccess()
+    remote_assistance.disableAndStop()
+  end
+end
+
+sendHTTPContentTypeHeader('text/html')
+ntop.dumpFile(dirs.installdir .. "/httpdocs/inc/header.inc")
+dofile(dirs.installdir .. "/scripts/lua/inc/menu.lua")
+
+print("<hr>")
+print("<h2>") print(i18n("remote_assistance.product_remote_assistance", {product=info.product})) print("</h2>")
+print("<br>")
+
+local assistace_checked = ""
+local admin_checked = ""
+local assist_enabled = remote_assistance.isEnabled()
+
+if assist_enabled then
+  assistace_checked = "checked"
+end
+
+if ntop.getPref("ntopng.prefs.remote_assistance.admin_access") == "1" then
+  admin_checked = "checked"
+end
+
+print [[
+  <form id="remote_assistance_form" class="form-inline" method="post">
+    <input id="csrf" name="csrf" type="hidden" value="]] print(ntop.getRandomCSRFValue()) print [[" />
+
+    <div id="assistance-config" class="tab-pane in active">
+      <table class="table table-striped table-bordered">
+        <tr>
+          <th width=22%>]] print(i18n("remote_assistance.enable_remote_assistance")) print [[</th>
+          <td>
+            <div class="form-group">
+              <input id="toggle_remote_assistance" name="toggle_remote_assistance" type="checkbox" value="1" ]] print(assistace_checked) print [[/>
+            </div>
+            <div style="margin-left: 0.5em; display:inline">]] print(remote_assistance.statusLabel()) print[[</div>
+          </td>
+        </tr>
+        <tr>
+          <th>]] print(i18n("key")) print[[</th>
+          <td><input id="assistance_key" class="form-control" data-ays-ignore="true" name="assistance_key" value="]] print(ntop.getPref("ntopng.prefs.remote_assistance.key")) print[[" readonly /><br>
+          <small>]] print(i18n("remote_assistance.key_descr")) print[[</small>
+          </td>
+        </tr>
+        <tr>
+          <th>]] print(i18n("remote_assistance.admin_access")) print[[</th>
+          <td><input name="allow_admin_access" type="checkbox" value="1" ]] print(admin_checked) print [[/><br>
+          <small>]] print(i18n("remote_assistance.admin_access_descr", {product = info.product})) print[[</small>
+          </td>
+        </tr>
+      </table>
+    </div>
+
+    <div id="tos-accept" style="]] print(ternary(assist_enabled, "", "display:none")) print[[">
+      <div class="form-group">
+        <input type="checkbox" name="accept_tos" data-ays-ignore="true" value="1" ]] print(ternary(assist_enabled, "required checked", "")) print[[ />
+      </div>
+      <span><b>]] print(i18n("remote_assistance.tos_notice")) print[[</b></span>
+    </div>
+
+    <button class="btn btn-primary" style="float:right; margin-right:1em;" disabled="disabled" type="submit">]] print(i18n("save_settings")) print[[</button>
+  </form>
+  <br><br>
+
+  <span>]]
+print(i18n("notes"))
+print[[
+  <ul>
+      <li>]] print(i18n("remote_assistance.note_sensitive")) print[[</li>
+      <li>]] print(i18n("remote_assistance.remember_disable")) print[[</li>
+      <li>]] print(i18n("remote_assistance.will_create_virtual_network") .. " " .. i18n("remote_assistance.ask_admin")) print[[</li>]]
+   print[[
+    </ul>
+  </span>
+
+  <script>
+    aysHandleForm("#remote_assistance_form");
+
+    function genNumericId() {
+      // 10 digits
+      return Math.random().toString().substring(2,12);
+    }
+
+    function generate_credentials() {
+      var today = Math.floor($.now() / 1000 / 86400); // days since first epoch
+
+      $("#assistance_key").val(genNumericId());
+    }
+
+    $("#toggle_remote_assistance").change(function() {
+      var is_enabled = $("#toggle_remote_assistance").is(":checked");
+
+      if(is_enabled) {
+        generate_credentials();
+        $("#tos-accept").show().find("input").attr("required", "required");
+      } else {
+        $("#tos-accept").hide().find("input").removeAttr("required");
+      }
+    });
+  </script>
+]]
+
+dofile(dirs.installdir .. "/scripts/lua/inc/footer.lua")