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CAcert OAuth2 / OpenID Connect IDP

This repository contains an implementation for an identity provider. ORY 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 © 2020-2023 Jan Dittberner



You need a set of certificate and private key and a PEM file with CA certificates used to verify client certificates to run cacert-idp.

An easy way to generate server certificate and key for local testing is mkcert.

  1. Run mkcert to generate idp.cacert.localhost+1.pem and idp.cacert.localhost+1-key.pem:

    mkcert -cert-file idp.cacert.localhost login.cacert.localhost
  2. Copy CA certificate for client certificates

    (curl -s ; \
     curl -s ) > 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:

csrf.key = "<32 bytes of base64 encoded data>"


Now you can start the IDP:

go run cmd/idp.go


This application uses go-i18n for internationalization (i18n) support.

The translation workflow needs the go18n binary which can be installed via

go install

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).