我正在尝试在Qt中编写一个简单的客户端 - 服务器应用程序,它将通过SSL进行通信。我尝试使用QSslSockets,但我一直遇到各种问题。
看看这个:
客户端:
#define dumpvar(x) qDebug()<<#x<<'='<<x
int main(int argc, char** argv)
{
QApplication a(argc, argv);
QSslSocket s;
auto cert = QSslCertificate::fromPath("/home/piotrek/cert.pem");
Q_ASSERT(!cert.isEmpty());
s.setCaCertificates({cert});
s.connectToHostEncrypted("localhost", 1234);
qDebug()<<"waiting for encrypted";
if (!s.waitForEncrypted(10000)){
dumpvar(s.errorString());
dumpvar(s.sslErrors());
return 0;
}
qDebug()<<"client connected";
}
服务器:
#define dumpvar(x) qDebug()<<#x<<'='<<x
class SslServer: public QTcpServer
{
// QTcpServer interface
protected:
void incomingConnection(qintptr handle) override
{
QSslSocket s;
if (!s.setSocketDescriptor(handle)){
dumpvar(s.errorString());
return;
}
s.setLocalCertificate("/home/piotrek/cert.pem");
s.setPrivateKey("/home/piotrek/pkey.pem", QSsl::Rsa, QSsl::Pem, "test");
s.startServerEncryption();
qDebug()<<"waiting for encrypted";
if(!s.waitForEncrypted(10000)){
dumpvar(s.errorString());
dumpvar(s.sslErrors());
return;
}
qDebug()<<"server encrypted";
handleConnection(&s);
}
};
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
SslServer s;
s.listen(QHostAddress::Any, 1234);
return a.exec();
}
客户打印:
qt.network.ssl: QSslSocket: cannot resolve SSLv2_client_method
qt.network.ssl: QSslSocket: cannot resolve SSLv2_server_method
waiting for encrypted
<10 second pause>
s.errorString() = "Network operation timed out"
s.sslErrors() = ()
服务器打印:
qt.network.ssl: QSslSocket: cannot resolve SSLv2_client_method
qt.network.ssl: QSslSocket: cannot resolve SSLv2_server_method
waiting for encrypted
<10 second pause>
s.errorString() = "The remote host closed the connection"
s.sslErrors() = (
我做错了什么?
答案 0 :(得分:2)
警告的解释是Ubuntu中的OpenSSL
编译时没有不安全的sslv2,但Qt 5.8尝试在运行时加载这些函数。 Qt默认情况下仅使用安全协议,因此除非您使用QSsl::SslV2
明确调用QSslSocket::setProtocol(这当然不适用于您的openssl),否则这些警告不会对您产生影响。
显然你的自签名有问题吗?证书即可。此外,除非明确忽略主机名不匹配,否则无论如何,连接都会失败并使用自签名证书。
如果您使用自签名证书,可以使用here找到的说明重新生成证书。
请在下面找到工作代码示例。在类似环境(意外!)Ubuntu 16.10, OpenSSL 1.0.2g 1 Mar 2016, Qt 5.8.0
上进行测试。
class SslServer: public QTcpServer
{
// QTcpServer interface
protected:
void incomingConnection(qintptr handle) override
{
QSslSocket s;
if (!s.setSocketDescriptor(handle)){
dumpvar(s.errorString());
return;
}
const QString serverCertPath("/path/to/server1.pem");
const QString serverKeyPath("/path/to/server1.key");
s.setLocalCertificate(serverCertPath);
s.setPrivateKey(serverKeyPath, QSsl::Rsa, QSsl::Pem, "test");
s.startServerEncryption();
qDebug()<<"waiting for encrypted";
if(!s.waitForEncrypted(10000)){
dumpvar(s.errorString());
dumpvar(s.sslErrors());
return;
}
qDebug()<<"server encrypted";
s.write("Hello client");
s.flush();
s.waitForBytesWritten(3000);
s.close();
}
};
int main(int argc, char** argv)
{
QCoreApplication a(argc, argv);
QSslSocket s;
const QString rootCAPath("/path/to/rootCA.pem");
auto rootCACert = QSslCertificate::fromPath(rootCAPath);
Q_ASSERT(!rootCACert.isEmpty());
s.setCaCertificates(rootCACert);
// ignore SSL host name mismatch error for server certificate
QList<QSslError> errorsToIgnore;
const QString serverCertPath("/path/to/server1.pem");
auto serverCert = QSslCertificate::fromPath(serverCertPath);
Q_ASSERT(!serverCert.isEmpty());
errorsToIgnore<<QSslError(QSslError::HostNameMismatch, serverCert.at(0));
s.ignoreSslErrors(errorsToIgnore);
s.connectToHostEncrypted("localhost", 1234);
qDebug()<<"waiting for encrypted";
if (!s.waitForEncrypted(10000)){
dumpvar(s.errorString());
dumpvar(s.sslErrors());
return 0;
}
qDebug()<<"client connected";
s.waitForReadyRead(3000);
qDebug() << "Reading: " << s.bytesAvailable();
qDebug() << s.readAll();
s.close();
}
服务器输出:
qt.network.ssl: QSslSocket: cannot resolve SSLv2_client_method
qt.network.ssl: QSslSocket: cannot resolve SSLv2_server_method
waiting for encrypted
server encrypted
客户端输出:
qt.network.ssl: QSslSocket: cannot resolve SSLv2_client_method
qt.network.ssl: QSslSocket: cannot resolve SSLv2_server_method
waiting for encrypted
client connected
Reading: 12
"Hello client"
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