Be more strict about opening URLs.

In the proto tree, copy URLs instead of opening them.

In the export dialog, enable previews only if the advertised MIME type
*and* the contents of the file are plain text, GIF, JPEG, or PNG.

Add warnings to the wslua browser_open_url and browser_open_data_file
documentation.

Fixes #17232.

epan/wslua/wslua_gui.c

@@ -1103,7 +1103,16 @@ WSLUA_FUNCTION wslua_reload_lua_plugins(lua_State* L) { /* Reload all Lua plugin
 }
 
 
-WSLUA_FUNCTION wslua_browser_open_url(lua_State* L) { /* Opens an URL in a web browser. Requires a GUI. */
+WSLUA_FUNCTION wslua_browser_open_url(lua_State* L) { /*
+    Opens an URL in a web browser. Requires a GUI.
+
+    [WARNING]
+    ====
+    Do not pass an untrusted URL to this function.
+
+    It will be passed to the system's URL handler, which might execute malicious code, switch on your Bluetooth-connected foghorn, or any of a number of unexpected or harmful things.
+    ====
+    */
 #define WSLUA_ARG_browser_open_url_URL 1 /* The url. */
     const char* url = luaL_checkstring(L,WSLUA_ARG_browser_open_url_URL);
 
@@ -1121,6 +1130,13 @@ WSLUA_FUNCTION wslua_browser_open_data_file(lua_State* L) { /*
     Open a file located in the data directory (specified in the Wireshark preferences) in the web browser.
     If the file does not exist, the function silently ignores the request.
     Requires a GUI.
+
+    [WARNING]
+    ====
+    Do not pass an untrusted URL to this function.
+
+    It will be passed to the system's URL handler, which might execute malicious code, switch on your Bluetooth-connected foghorn, or any of a number of unexpected or harmful things.
+    ====
     */
 #define WSLUA_ARG_browser_open_data_file_FILENAME 1 /* The file name. */
     const char* file = luaL_checkstring(L,WSLUA_ARG_browser_open_data_file_FILENAME);

ui/qt/export_object_dialog.cpp

@@ -17,9 +17,11 @@
 #include "ui/qt/widgets/wireshark_file_dialog.h"
 #include <ui/qt/widgets/export_objects_view.h>
 #include <ui/qt/models/export_objects_model.h>
+#include <ui/qt/utils/qt_ui_utils.h>
 
 #include <QDialogButtonBox>
 #include <QMessageBox>
+#include <QMimeDatabase>
 #include <QPushButton>
 #include <QComboBox>
 #include <QDir>
@@ -95,14 +97,27 @@ void ExportObjectDialog::currentHasChanged(QModelIndex current)
         QModelIndex sibl = current.sibling(current.row(), ExportObjectModel::colPacket);
         if (eo_ui_->buttonBox->button(QDialogButtonBox::Open))
         {
-            QString cont = sibl.sibling(current.row(), ExportObjectModel::colContent).data().toString();
-            /* For security reasons application and unknown are disabled */
-            eo_ui_->buttonBox->button(QDialogButtonBox::Open)->setEnabled(! cont.startsWith("application/") && ! cont.startsWith("unknown/"));
+            QString mime_type = sibl.sibling(current.row(), ExportObjectModel::colContent).data().toString();
+            eo_ui_->buttonBox->button(QDialogButtonBox::Open)->setEnabled(mimeTypeIsPreviewable(mime_type));
         }
         wsApp->gotoFrame(sibl.data().toInt());
     }
 }
 
+bool ExportObjectDialog::mimeTypeIsPreviewable(QString mime_type)
+{
+    // XXX This excludes everything except HTTP. Maybe that's a good thing?
+    // Take care when adding to this, e.g. text/html or image/svg might contain JavaScript.
+    QStringList previewable_mime_types = QStringList()
+            << "text/plain"
+            << "image/gif" << "image/jpeg" << "image/png";
+
+    if (previewable_mime_types.contains(mime_type)) {
+        return true;
+    }
+    return false;
+}
+
 void ExportObjectDialog::modelDataChanged(const QModelIndex&, int from, int to)
 {
     bool contentTypes_changed = false;
@@ -203,8 +218,16 @@ void ExportObjectDialog::on_buttonBox_clicked(QAbstractButton *button)
         QString temp;
         saveCurrentEntry(&temp);
 
-        if (temp.length() > 0)
-            QDesktopServices::openUrl(QUrl(QString("file:///").append(temp), QUrl::TolerantMode));
+        if (temp.length() > 0) {
+            QMimeDatabase mime_db;
+            QMimeType mime_type = mime_db.mimeTypeForFile(temp, QMimeDatabase::MatchContent);
+            if (mimeTypeIsPreviewable(mime_type.name())) {
+                QDesktopServices::openUrl(QUrl(QString("file:///").append(temp), QUrl::TolerantMode));
+            } else {
+                desktop_show_in_folder(temp);
+            }
+
+        }
         break;
     }
     default: // Help, Cancel

ui/qt/export_object_dialog.h

@@ -55,6 +55,7 @@ private slots:
     void currentHasChanged(QModelIndex current);
 
 private:
+    bool mimeTypeIsPreviewable(QString mime_type);
     void saveCurrentEntry(QString *tempFile = Q_NULLPTR);
     void saveAllEntries();
 

ui/qt/proto_tree.cpp

@@ -614,7 +614,9 @@ void ProtoTree::itemDoubleClicked(const QModelIndex &index)
     } else {
         QString url = finfo.url();
         if (!url.isEmpty()) {
-            QDesktopServices::openUrl(QUrl(url));
+            QApplication::clipboard()->setText(url);
+            QString push_msg = tr("Copied ") + url;
+            wsApp->pushStatus(WiresharkApplication::TemporaryStatus, push_msg);
         }
     }
 }