oidc-registration/README.md

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# OpenID Connect client registration for CAcert
This repository contains an implementation for a OAuth2/OpenID Connect client
registration application that is meant to be used with [ORY
Hydra](https://www.ory.sh/hydra/).
The code in this repository is licensed under the terms of the Apache License
Version 2.0.
Copyright © 2021 Jan Dittberner
## Setup
### Certificates
You need a set of certificates for the client registration application. You can
use the Test CA created by the ``setup_test_ca.sh`` script from the [CAcert
developer setup](https://git.dittberner.info/jan/cacert-devsetup) repository
like this:
1. create signing request
```
mkdir certs
cd certs
openssl req -new -newkey rsa:3072 -nodes \
-keyout registration.cacert.localhost.key \
-out registration.cacert.localhost.csr.pem \
-subj /CN=registration.cacert.localhost \
-addext subjectAltName=DNS:registration.cacert.localhost
cp *.csr.pem $PATH_TO_DEVSETUP_TESTCA/
```
2. Use the CA to sign the certificates
```
pushd $PATH_TO_DEVSETUP_TESTCA/
openssl ca -config ca.cnf -name class3_ca -extensions server_ext \
-in registration.cacert.localhost.csr.pem \
-out registration.cacert.localhost.crt.pem -days 365
popd
cp $PATH_TO_DEVSETUP_TESTCA/registration.cacert.localhost.crt.pem .
```
3. Copy CA certificate for client certificates
```
openssl x509 -in $PATH_TO_DEVSETUP_TESTCA/class3/ca.crt.pem \
-out client_ca.pem
```
### Configure registration
The client registration application requires a strong random key for its
CSRF cookie. You can generate such a key using the following openssl command:
```
openssl rand -base64 32
```
Use this value and the URL of the Hydra admin API to create
`registration.toml`:
```
[security]
csrf.key = "<32 bytes of base64 encoded data>"
[hydra]
admin.url = "https://hydra.cacert.localhost:4445/"
```
## Start
Now you can start Hydra, the IDP and the demo app in 3 terminal windows:
```
go run cmd/registration/main.go
```
Visit https://registration.cacert.localhost:5000/ in a Browser to use the
client registration application.
## Translations
This application uses [go-i18n](https://github.com/nicksnyder/go-i18n/) for
internationalization (i18n) support.
The translation workflow needs the `go18n` binary which can be installed via
```
go get -u github.com/nicksnyder/go-i18n/v2/goi18n
```
To extract new messages from the code run
```
goi18n extract .
```
Then use
```
goi18n merge active.*.toml
```
to create TOML files for translation as `translate.<locale>.toml`. After translating the messages run
```
goi18n merge active.*.toml translate.*.toml
```
to merge the messages back into the active translation files. To add a new language you need to add the language code
to the languages configuration option (default is defined in the configmap in cmd/idp/main.go and cmd/app/main.go).