Systemsicherheit/7-SGX_Hands-on/README.md
2024-07-08 11:19:48 +02:00

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# Signature Relay for firmware
Documentation of the Assignment 7 in Systems Security at Ruhr-Universität Bochum.
This is a program, that uses a TEE to build a signature relay to sign firmware with a master key.
For more informationm, read the [project description](doc/abgabe.pdf).
We recommend viewing the [repository](https://git.pfzetto.de/RubNoobs/Systemsicherheit/src/branch/master/Assignment 7 - SGX Hands-on) we worked on together at.
## Requirements
You will need the latest version of OpenSSL.
Execute the following command inside the src directory to automatically meet all requirements.
```bash
$ ./setup
```
## Compiling
This project can be compiled for simulation environments or directly on the hardware.
1. **Simulated environment**
In the src directory type the command
```bash
$ make SGX_MODE=SIM
```
2. **Hardware**
In the src directory type the command
```bash
$ make
```
That creates all the necessary objects and binaries to execute.
The executable binary will be `src/signatureproxy`.
## Running
## Running story
To execute an example usage of the project, execute `./simulate` in src directory.
Note, that this will only work, if you sucessfully compiled the project.
## Manual Usage
### Setup
Go to the `src` directory.
Initialize the Enclave keypair by executing:
`./signatureproxy proxysetup -pkey <sealed_proxy_key.bin> > <proxy_public_key.pem>`
### Sign
1. Create employee signature using `./signatureproxy employee -firm <firmware.bin> -ekey <employee_privat_key.pem> > <employee_signature.der>`
This step can also be done using OpenSSL: `openssl dgst -sha256 -sign <employee_private_key.pem> -out <employee_signature.der> -in <firmware.bin>`
2. Use the signature proxy to resign the firmware using `./signatureproxy proxy -pkey <sealed_proxy_key.bin> -epub <employee_public_key.der> -firm <firmware.bin> > <proxy_signature.der>`
The enclave verifies the employee signature and signs the firmware if the signature is valid.
3. Verify signature using `cat <proxy_signature.der> | ./signatureproxy embedded -firm <firmware.bin> -ppub <proxy_public_key.pem>`
This step can also be done using OpenSSL: `openssl dgst -sha256 -verify <proxy_public_key.pem> -signature <proxy-signature.der> <firmware.bin>`
## License
Everything we did ourselves is licensed under the [GNU GPLv3 License](./LICENSE)
## Contributors
- Benjamin Haschka
- Sascha Tommasone
- Paul Zinselmeyer