ccfdns

A CCF-based, attested DNS server.

Build

The build depends on a local installation of CCF 6.0.0 or above, on Azure Linux 3.0.

mkdir build
cd build
cmake -GNinja -DVIRTUAL=ON ..
ninja

Run sandbox:

(May depend on your version of CCF)

/opt/ccf_virtual/bin/sandbox.sh -p libccfdns.virtual.so

Run aDNS server/service

For an example of how to run an aDNS server/service, see adns_service.py. Most of this is a simple application of the CCF infrastructure scripts. The CCF documentation describes all of the components.

Note that for a complete service, your server(s) or VM(s) must be SEV-SNP-enabled and registered with at least a traditional, DNSSEC-enabled DNS server. Of course, that server may also be another aDNS server.

Additionally, you may have to

Add inbound rules to your network security group/firewall to allow inbound traffic on port 53
Disable the service systemd-resolved (which uses also uses port 53) and manually add a well-known DNS server to /etc/resolve.conf.
If you are using docker to run the service, then use the host network

Contributing

This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit https://cla.opensource.microsoft.com.

When you submit a pull request, a CLA bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., status check, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.

Trademarks