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# Solo
This is the source code for Solo. It implements the authenticator U2F and FIDO2 protocols. It is designed
to be easily ported to lightweight embedded platforms, as well as run on the PC.
This is the source code for Solo. Solo is a security key that implements FIDO2/U2F and supports USB, NFC, and extensions. Extensions
include SSH, GPG, and cryptocurrency. Solo is a work in progress.
![](https://i.imgur.com/cXWtI1D.png)
![](https://i.imgur.com/vwFbsQW.png?1)
The Solo FIDO2/U2F code base is designed to be easily ported to different embedded systems.
Right now, it has been ported to the NRF52840 and EFM32J. Soon to be supported is the SAM L11.
No hardware is needed for development. You can run and extend the FIDO2 code base
using just your PC.
# Security
Solo is based on the SAM L11 secure microcontroller. It offers the following security features.
- True random number generation to guarantee random keys.
- Side channel resistant RAM and AES for physically secure key derivation.
- ARM TrustZone to provide security isolation for master key.
- Scrambled key storage to prevent invasive flash readout methods.
- Secure boot to ensure application integrity.
The SAM L11 is one of the best chips for this application in terms of security,
when considering the NDA-free market.
Solo can be trusted to be running the open source code. The firmware can be readout using a debugger to verify that a Solo is running
the code posted publicly. The secret information is of course inaccessible.
# How do I get one?
We are still working on open sourcing an implementation that anyone can cheaply
build and program, just like with U2F Zero. This will be released soon. It will be easy to solder :)
In the meantime, you can port the code to your favorite microcontroller, or support
us by [signing up for our Kickstarter](https://solokeys.com/). Our aim is to crowdfund enough to make an economic
bulk order and provide open source security tokens for everyone that is interested. We will offer
"hackable" tokens that come with USB bootloaders and are reprogrammable.
[Sign up here](https://solokeys.com/)!
No hardware is needed for development.
# Setting up
Clone and Compile CBOR library and FIDO 2 client library.
```bash
git clone https://github.com/conorpp/u2f-one
cd u2f-one/
git clone https://github.com/SoloKeysSec/solo
cd solo/
git submodule update --init
cd tinycbor && make
@ -22,6 +58,10 @@ python setup.py install
```
Note that our python-fido2 fork will only connect to the software FIDO2 application,
not a hardware authenticator. Install Yubico's fork to do that.
Open `crypto/tiny-AES-c/aes.h` in a text editor and make sure AES256 is selected as follows.
```
@ -41,10 +81,8 @@ make
The application is set up to send and recv USB HID messages over UDP to ease
development and reduce need for hardware.
Testing can be done using Yubico's client software. Note that the client
software is also a work in progress and the [FIDO 2.0
specification](https://fidoalliance.org/specs/fido-v2.0-ps-20170927/fido-client-to-authenticator-protocol-v2.0-ps-20170927.html)
is ultimate. Some small changes to Yubico's Client software make it send
Testing can be done using our fork of Yubico's client software, `python-fido2`.
Our fork of `python-fido2` has small changes to make it send
USB HID over UDP to the authenticator application.
Run FIDO 2 / U2F application.
@ -53,16 +91,49 @@ Run FIDO 2 / U2F application.
./main
```
Run client software.
Run example client software. This runs through a registration and authentication.
```
python python-fido2/examples/credential.py
```
You should see messages exchange between the client and the authenticator but that's it. Follow specifications to develop further.
Run the FIDO2 tests.
```
python tools/ctap_test.py
```
Follow specifications to really dig in.
[https://fidoalliance.org/specs/fido-v2.0-ps-20170927/fido-client-to-authenticator-protocol-v2.0-ps-20170927.html](https://fidoalliance.org/specs/fido-v2.0-ps-20170927/fido-client-to-authenticator-protocol-v2.0-ps-20170927.html)
## Extensions
Extensions can be added to FIDO2/U2F to support things like SSH, GPG, and cryptocurrency.
Right now, an experimental cryptocurrency extension can be found in `fido2/extensions` and `web/index.html`.
More documentation to come.
The main goal is to expose an extensible API on Solo, like the following:
- Command to store private key
- Command to sign arbitrary hash
- Command to derive a public key
- Commands for setting/changing/authenticating a pin code (like in FIDO2)
- Command to expose entropy from TRNG.
Using these generic commands, various external programs can be implemented for the security key.
Since FIDO2/U2F are implemented, these programs can potentially work in the browser on desktops
and mobile devices, with no drivers needed to be installed.
## Porting
The main code base is in `fido2/`. See `targets/nrf52840`, `targets/efm32/src`, and `pc/`
for examples of FIDO2/U2F ports. In essence, you just need to reimplement `device.c`. Optionally you can
re-implement `crypto.c` to accelerate operations and/or add other security features.
More documentation to come.
# Contributors
Contributors are welcome. The ultimate goal is to have a FIDO 2 hardware token
@ -70,10 +141,10 @@ capable of USB, Bluetooth, and NFC interfaces. There could be multiple tokens
for each interface. [Hardware is still being decided
on](https://github.com/conorpp/u2f-zero/issues/76).
Look at the issues to see what is currently being worked on. Feel free to add issues as well.
This is an upgrade to [U2F
Zero](https://github.com/conorpp/u2f-zero). A lot of the hardware and software
will be different so I think it's best to start a new repository.
Zero](https://github.com/conorpp/u2f-zero).