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I followed these instructions to setup X.509 authentication with Azure IoT C Device SDK:
https://learn.microsoft.com/de-de/azure/iot-hub/iot-hub-security-x509-get-started
https://github.com/Azure/azure-iot-sdk-c/blob/master/tools/CACertificates/CACertificateOverview.md
and the sample C code from https://github.com/Azure/azure-iot-sdk-c/blob/master/iothub_client/samples/iothub_ll_client_x509_sample/iothub_ll_client_x509_sample.c
I changed the connection string in the sample code and exchanged the device certificate and private key with the ones that were generated during the tutorial.
I created the Root CA according to the tutorial, registered the Root CA in the IoT Hub and proofed the possession. The certificate is marked as valid in the IoT Hub.
Next, I created a new device using X509 CA authentication.
When I run the demo code the following error appears:
Func:mqtt_operation_complete_callback Line:1758 Connection Not Accepted: 0x5: Not Authorized
Did I miss a step during setup?
Hello @Johannes thank you for the question.
The tutorial you followed on docs guide us through using the C# Sdk, therefore there are some nuances not documented there.
Let me nevertheless go over the sample C code and double check it works without changes to the code.
In the meantime please validate that you also replaced the values for static const char* x509certificate and static const char* x509privatekey .
Thanks!
Hello @António Sérgio Azevedo thank you for the quick reply. I found no tutorial for the C SDK so I tried to follow that one and adapt the steps to the C SDK.
The x509certificate and x509privatekey variables are set using the content of "new-edge-device.cert.pem" and "new-edge-device.key.pem" that are generated during the tutorial.
Is this the correct connection String for X509 authentication: connectionString = "HostName=myHost;DeviceId=myDevice;x509=true" ? I found no doc about the connection string setting for X509 so I took the one from the sample iothub_ll_client_x509_sample.c and apated it.
Regards Johannes
@Johannes I went through the doc and compiled C-SDk and used the sample to connect to IoTHub and I was successful. I have done this on Windows.
I tried to manipulate the variables static const char* connectionString static const char* x509certificate static const char* x509privatekey but could never see in the console app the same error you reported Func:mqtt_operation_complete_callback Line:1758 Connection Not Accepted: 0x5: Not Authorized .
Is this the correct connection String for X509 authentication: connectionString = "HostName=myHost;DeviceId=myDevice;x509=true" ?
Yes that is correct. HostName should be YourIoTHubname.azure-devices.net
1) Can you try changing the protocol to MQTT over websockets or AMQP ? Should be done on lines 24-28 from iothub_ll_client_x509_sample.c .
Thanks!
I double checked everything again and found my error. I saw that I used the edge device certificates instead of the leaf device certificates that are correct in the context for my application. Everything is working fine if I use the leaf device certificates. Sorry.
Thanks for checking and sharing the solution @Johannes :). Please mark it as the answer. Happy coding!