oidc-idp/README.md

# CAcert OAuth2 / OpenID Connect IDP

This repository contains an implementation for an identity provider. [ORY
Hydra](https://www.ory.sh/hydra/) is used for the actual OAuth2 / OpenID
Connect operations. The implementation in this repository provides the end user
UI components that are required by Hydra to allow login and consent.

The code in this repository is licensed under the terms of the Apache License
Version 2.0.

Copyright © 2020-2022  Jan Dittberner

## Setup

### Certificates

You need a set of certificates for the IDP. 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 requests

   ```
   mkdir certs
   cd certs
   openssl req -new -newkey rsa:3072 -nodes \
       -keyout idp.cacert.localhost.key \
       -out idp.cacert.localhost.csr.pem \
       -subj /CN=idp.cacert.localhost \
       -addext subjectAltName=DNS:idp.cacert.localhost,DNS:login.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 idp.cacert.localhost.csr.pem \
       -out idp.cacert.localhost.crt.pem -days 365
   popd
   cp $PATH_TO_DEVSETUP_TESTCA/idp.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 IDP

The Identity Provider application (IDP) 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 to create `idp.toml`:

```
[security]
csrf.key = "<32 bytes of base64 encoded data>"
```

## Start

Now you can start the IDP:

  ```
  make
  go run cmd/idp.go
  ```

## 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 install 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.go).