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