Using OpenSSL 3 https connection

[kevin_d]

Hello Folks!

I need to access a https connection in Qt 5 with a windows and a linux build.

This is the code I am trying tu use:

QNetworkAccessManager nam;
QSslConfiguration config( QSslConfiguration::defaultConfiguration() );
QNetworkRequest req(QUrl("https://myurl.file"));
req.setSslConfiguration( config );
QNetworkReply* reply = nam.get(req);
QEventLoop loop;
QObject::connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
loop.exec();
bool isConnected = reply->bytesAvailable(); // false

What do i need to connect via OpenSSL3 (Windows and Linux Client)

best regards, kevin

[SGaist]

Hi,

Two conditions:

• have a build of Qt which supports OpenSSL 3
• have the OpenSSL 3 libraries in a suitable place where Qt can load them.

[kevin_d]

On Windows:

• With the Qt MaintenanceTool, I installed "OpenSSL 3.0.15 Toolkit" 64 bit Binaries.
• From X:\Qt3D\Tools\OpenSSLv3\Win_x64\bin, I copied "libcrypto-3-x64.dll" and "libssl-3-x64.dll" to my build directory
• In my .pro-File, I added

• LIBS += X:\Qt3D\Tools\OpenSSLv3\Win_x64\lib\libcrypto.lib
• LIBS += X:\Qt3D\Tools\OpenSSLv3\Win_x64\lib\libssl.lib
• INCLUDEPATH += X:\Qt3D\Tools\OpenSSLv3\Win_x64\include\openssl

Also, i added the path to the .dlls to the Windows-PATH variable.
According to "https://doc.qt.io/qt-5/windows-requirements.html", i added

• libcrypto-3-x64.dll and
• libssl-3-x64.dll
  to the X:\Windows\system32 folder.

The runtime states:
qt.network.ssl: QSslSocket::connectToHostEncrypted: TLS initialization failed
sslibbuild: "OpenSSL 1.1.1g 21 Apr 2020"
ssllibversionstring: ""
supportsSsl: false

And connection still fails.

What am I missing?

best regards, kevin

[JonB]

@kevin_d said in Using OpenSSL 3 https connection:

I need to access a https connection in Qt 5

@SGaist said in Using OpenSSL 3 https connection:

have a build of Qt which supports OpenSSL 3

Although this is not my area, start by checking exactly which version of Qt 5 you have? Read through e.g. https://forum.qt.io/topic/136960/does-qt-5-15-support-openssl-3-x. It appears to me you need Qt 5.15.13 onward. I am unclear whether it requires you to build the Qt 5.x with this support yourself. Google qt 5 ssl 3 for further reading, e.g. maybe https://gist.github.com/seyedmmousavi/b1f6681eb37f3edbe3dcabb6e89c5d43.

Assuming you do need SSL 3, I don't know whether you might be better considering upgrading your own to Qt 6.

[kevin_d]

I am indeed using Qt 5.15.2

[SGaist]

@kevin_d then you have to build the latest Qt 5 version yourself or use Qt 6.

I remember there's a forum member providing builds of Qt 5. You can search for it.

[piervalli]

The version 5.15.2 does not support Openssl 1.1, you should build by source last version of Qt5. Usually I copy libcrypto-3-x64.dll and
libssl-3-x64.dll in the folder of executable to avoid conflit con system32.

[SGaist]

@piervalli Qt 5.15.2 does support OpenSSL 1.1 it's 3.0 that's not supported.

[JonB]

Indeed. As per the post I drew attention to previously, apparently for Qt5 with SSL/OpenSSL 3 you would need 5.15.3, and OP only has 5.15.2 :(
I am still not sure whether the 5.15.3 has to be compiled a certain way (option) to make it do SSL at all or SSL 3 at least. If you get one pre-compiled by someone else you would need to check this.

[piervalli]

@JonB in the release notes openssl 3 is added in the 5.15.10