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Thread: connect to rest service with qt and error SSL handshake failed

  1. #1
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    Oct 2012
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    Default connect to rest service with qt and error SSL handshake failed

    I am trying to connect to rest service that has ssl certificates. I have those certificates files(cacert.pem and another file .pem) locally.
    For this purpose I use qt library.
    I can connect to a rest service without certificates but I cannot connect to a service with certificates.

    I try this code(having the certificate in the release folder of the project)

    Qt Code:
    1. QNetworkAccessManager *m_network = new QNetworkAccessManager(this);
    2.  
    3. QNetworkRequest request;
    4.  
    5. QUrl wapi_url=QUrl("...");
    6.  
    7. wapi_url.setPort(8082);
    8.  
    9. request.setUrl(wapi_url);
    10.  
    11. QSslConfiguration SslConfiguration(QSslConfiguration::defaultConfiguration());
    12.  
    13. QList<QSslCertificate> caList = SslConfiguration.caCertificates();
    14.  
    15. caList.append(QSslCertificate("cacert.pem")); //Root CA
    16.  
    17. SslConfiguration.setCaCertificates(caList);
    18.  
    19. SslConfiguration.setLocalCertificate(QSslCertificate("bla_bla_server.pem"));
    20.  
    21. SslConfiguration.setProtocol(QSsl::SslV3);
    22.  
    23. SslConfiguration.setPeerVerifyMode(QSslSocket::VerifyPeer);
    24.  
    25. request.setSslConfiguration(SslConfiguration);
    26. QNetworkReply *reply = m_network->get(request);
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    but I get a SSL handshake failed error.
    Any idea how can I pass this error and connect to the rest service?

  2. #2
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    Default Re: connect to rest service with qt and error SSL handshake failed

    You could start by telling us what the error was (any text output and the QSslError value) and whether you have installed OpenSSL.

  3. #3
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    Default Re: connect to rest service with qt and error SSL handshake failed

    Yes I have installed OpenSSL.
    I connect the QNetworkReply:networkerror with a method messageError like this

    connect(reply, SIGNAL(error(QNetworkReply::NetworkError)), this,SLOT(messageError(QNetworkReply::NetworkError )));

    and the error I get is "SSL handshake failed" and the number is 6
    I also have added a connection like that

    connect(m_network, SIGNAL(sslErrors(QNetworkReply , const QList<QSslError> &)), this, SLOT(sslError(QNetworkReply, const QList<QSslError> &)));

    but my code doesn't go inside sslError method.
    Any idea about that?

    Thank you in advance!

  4. #4
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    Default Re: connect to rest service with qt and error SSL handshake failed

    There is no SIGNAL or SLOT matching the signature"sslErrors(QNetworkReply , const QList<QSslError> &)". Perhaps you mean "sslErrors(QNetworkReply*,QList<QSslError>)" and are ignoring the warning printed in the console by connect().
    For consistency you could use the sslErrors() signal from the reply object.

    If there is a more general SSL library issue you will also see warnings about that in the output.

  5. #5
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    Default Re: connect to rest service with qt and error SSL handshake failed

    I don't know if I have understand well what you have proposed.
    I have added the following line

    connect(reply, SIGNAL(sslErrors(QList<QSslError>)), this, SLOT(sslError2(const QList<QSslError>)));

    but the execution of the program does not get inside sslError2 slot.
    Last edited by panagiotisss; 21st September 2015 at 13:47.

  6. #6
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    Default Re: connect to rest service with qt and error SSL handshake failed

    I have achieved to pass this error by copying msvcr120.dll and msvcp120.dll in to bin folder of openssl
    But now I receive new errors
    QSslSocket: cannot call unresolved function SSLv3_client_method
    QSslSocket: cannot call unresolved function SSL_CTX_new
    QSslSocket: cannot call unresolved function SSL_library_init
    QSslSocket: cannot call unresolved function ERR_get_error

    I have the test line of code in qt
    qsslsocket::supportsssl()
    that returns false

    In my .pro file I have the qt+=network and I have also paste to qt bin folder the following dlls
    libeay32.dll
    libssl32.dll
    ssleay32.dll

    Any idea about that?

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