sslechoclient example: Verify server certificate

Exit the application in case of any SSL errors instead of ignoring them.

Fixes: QTBUG-108654
Change-Id: Id209930c29fd434e2ede7a4d38452296e8cfb6f2
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Øystein Heskestad <oystein.heskestad@qt.io>
(cherry picked from commit 6821b4426e74e3063936c5622b5eb2e249c40502)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

3 files changed, 23 insertions, 7 deletions

diff --git a/examples/websockets/sslechoclient/CMakeLists.txt b/examples/websockets/sslechoclient/CMakeLists.txt
index 719a915..b629a9d 100644
--- a/examples/websockets/sslechoclient/CMakeLists.txt
+++ b/examples/websockets/sslechoclient/CMakeLists.txt
@@ -19,6 +19,11 @@ qt_add_executable(sslechoclient
     sslechoclient.cpp sslechoclient.h
 )
 
+qt_add_resources(sslechoclient "cert"
+    BASE ../sslechoserver
+    FILES ../sslechoserver/localhost.cert
+)
+
 set_target_properties(sslechoclient PROPERTIES
     WIN32_EXECUTABLE FALSE
     MACOSX_BUNDLE FALSE
diff --git a/examples/websockets/sslechoclient/sslechoclient.cpp b/examples/websockets/sslechoclient/sslechoclient.cpp
index 1b768cf..e5099e1 100644
--- a/examples/websockets/sslechoclient/sslechoclient.cpp
+++ b/examples/websockets/sslechoclient/sslechoclient.cpp
@@ -1,9 +1,10 @@
 // Copyright (C) 2016 Kurt Pattyn <pattyn.kurt@gmail.com>.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 #include "sslechoclient.h"
+#include <QtCore/QCoreApplication>
 #include <QtCore/QDebug>
+#include <QtCore/QFile>
 #include <QtWebSockets/QWebSocket>
-#include <QCoreApplication>
 
 QT_USE_NAMESPACE
 
@@ -14,6 +15,15 @@ SslEchoClient::SslEchoClient(const QUrl &url, QObject *parent) :
     connect(&m_webSocket, &QWebSocket::connected, this, &SslEchoClient::onConnected);
     connect(&m_webSocket, QOverload<const QList<QSslError>&>::of(&QWebSocket::sslErrors),
             this, &SslEchoClient::onSslErrors);
+
+    QSslConfiguration sslConfiguration;
+    QFile certFile(QStringLiteral(":/localhost.cert"));
+    certFile.open(QIODevice::ReadOnly);
+    QSslCertificate certificate(&certFile, QSsl::Pem);
+    certFile.close();
+    sslConfiguration.addCaCertificate(certificate);
+    m_webSocket.setSslConfiguration(sslConfiguration);
+
     m_webSocket.open(QUrl(url));
 }
 //! [constructor]
@@ -37,12 +47,8 @@ void SslEchoClient::onTextMessageReceived(QString message)
 
 void SslEchoClient::onSslErrors(const QList<QSslError> &errors)
 {
-    Q_UNUSED(errors);
+    qWarning() << "SSL errors:" << errors;
 
-    // WARNING: Never ignore SSL errors in production code.
-    // The proper way to handle self-signed certificates is to add a custom root
-    // to the CA store.
-
-    m_webSocket.ignoreSslErrors();
+    qApp->quit();
 }
 //! [onTextMessageReceived]
diff --git a/examples/websockets/sslechoclient/sslechoclient.pro b/examples/websockets/sslechoclient/sslechoclient.pro
index 3fa9d9b..29bbe74 100644
--- a/examples/websockets/sslechoclient/sslechoclient.pro
+++ b/examples/websockets/sslechoclient/sslechoclient.pro
@@ -13,5 +13,10 @@ SOURCES += \
 HEADERS += \
     sslechoclient.h
 
+resources.files = ../sslechoserver/localhost.cert
+resources.prefix = /
+
+RESOURCES += resources
+
 target.path = $$[QT_INSTALL_EXAMPLES]/websockets/sslechoclient
 INSTALLS += target