postfixadmin-scim-api

This is a SCIM API for PostfixAdmin made by audriga and based on scim-server-php.

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Table of Contents

• Info
• Installation
  • Prerequisites
  • Installation
  • Configuration
• Authentication
  • Basic Auth
  • JWT tokens
    • Usage
    • JWT token generation
• Authorization
• SCIM clients
• Example calls
• Acknowledgements

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Info

postfixadmin-scim-api provides a SCIM v2.0 API to any PostfixAdmin setup.

This API supports the following:

• A custom SCIM resource Provisioning User implementation exending the standard SCIM resource User
  • This resource is mapped to PostfixAdmin mailboxes
• A custom SCIM resource Domain implementation
  • This resource is mapped to PostfixAdmin domains
• Standard CRUD operation on above SCIM resources
• Basic auth or JWT tokens for authentication and authorization

postfixadmin-scim-api makes direct requests to the PostfixAdmin database and does not rely on the PostfixAdmin code. It also comes with is own http framework provided by scim-server-php.

This is a work in progress project. It already works pretty well but some features will be added in the future and some bugs may still be arround 😉

Installation

As postfixadmin-scim-api is completely independent from PostfixAdmin installation, you don't have to install it on the same server than PostfixAdmin. postfixadmin-scim-api only requires an access to the PostfixAdmin database.

Prerequisites

• postfixadmin-scim-api requires PHP 7.4
• Dependencies are managed with composer
• .htaccess and public/.htaccess files are provided for the Apache HTTP Server
  • If you are using another HTTP server software, please adapt its configuration accordingly

Installation

• Clone the github repository in a location served by your HTTP server
• Get the dependencies with composer: composer update

Configuration

• Edit the config/config.php file to suits your needs

Authentication

Basic Auth

• To use Basic Auth, send valid Basic Auth credentials with all your SCIM requests
• See example bellow

curl https://my.server.com/scim/Users -u "superadmin@domain.com:superpassword"

JWT tokens

Usage

• To use a JWT token for authentication, send it as a Bearer Token
• See example bellow

curl https://my.server.com/scim/Users -H "Authorization: Bearer <token>"

JWT token generation

• To generate a JWT token for a user, use the generate_jwt.php script located in vendor/audriga/scim-server-php/bin/ and provided by scim-server-php
• The specified secret must be the same secret specified in the jwt section of the config/config.php config file
• See example bellow

vendor/audriga/scim-server-php/bin/generate_jwt.php --username superadmin@domain.com --secret secret

Authorization

• For now, only Super Admins are allowed to use the SCIM API
• Super Admins are authorized to perform all operations on all resources through the SCIM API
• Domain Admins and regular users will get a HTTP 401 error on all operations through the SCIM API

SCIM clients

• postfixadmin-scim-api was successfully tested with Azure AD as a SCIM client
• postfixadmin-scim-api should be compatible with any SCIM v2.0 client
• For a Keycloack client, you can have a look here: https://lab.libreho.st/libre.sh/scim/keycloak-scim

Example calls

Example calls (null values removed for readability):

$ curl https://my.postfix.admin.url/Users/aaaa@bli.fr -H 'Authorization: Bearer <token>'
{
   "schemas":[
      "urn:ietf:params:scim:schemas:core:2.0:User",
      "urn:audriga:params:scim:schemas:extension:provisioning:2.0:User"
   ],
   "id":"aaaa@bli.fr",
   "meta":{
      "resourceType":"User",
      "created":"2022-05-27 12:45:08",
      "location":"https://my.postfix.admin.url/Users/aaaa@bli.fr",
      "updated":"2022-06-15 13:07:30"
   },
   "userName":"aaaa@bli.fr",
   "name":{
      "formatted":"Aaaa"
   },
   "displayName":"Aaaa",
   "active":true,
   "emails":[
        {
            "primary":true,
            "value":"aaaa@bli.fr",
        }
   "urn:ietf:params:scim:schemas:audriga:provisioning:2.0:User":{
      "sizeQuota":51200000
   }
}

$ curl https://my.postfix.admin.url/Domains/my.domain.com -H 'Authorization: Bearer <token>'
{
   "id":"my.domain.com",
   "schemas":[
      "urn:ietf:params:scim:schemas:audriga:2.0:Domain"
   ],
   "meta":{
      "resourceType":"Domain",
      "created":"2022-06-03 14:37:16",
      "updated":"2022-06-03 14:37:16",
      "location":"https://my.postfix.admin.url/Domains/my.domain.com",
   },
   "domainName":"my.domain.com",
   "description":"",
   "maxAliases":50,
   "maxMailboxes":50,
   "maxQuota":10,
   "usedQuota":2048,
   "active":true
}

Acknowledgements

This software is part of the Open Provisioning Framework project that has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement No. 871498.