sftpgo-mirror/docs/oidc.md
Nicola Murino c6b8644828
OIDC: execute pre-login hook after IDP authentication
so the SFTPGo users can be auto-created using the hook

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>
2022-02-19 10:53:35 +01:00

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4.3 KiB
Markdown

# OpenID Connect
OpenID Connect integration allows you to map your identity provider users to SFTPGo admins/users and so you can login to SFTPGo Web Client and Web Admin user interfaces using your identity provider.
SFTPGo allows to configure per-binding OpenID Connect configurations. The supported configuration parameters are documented within the `oidc` section [here](./full-configuration.md).
Let's see a basic integration with the [Keycloak](https://www.keycloak.org/) identify provider. Other OpenID connect compatible providers should work by configuring them in a similar way.
We'll not go through the complete process of creating a realm/clients/users in Keycloak. You can look this up [here](https://www.keycloak.org/docs/latest/server_admin/index.html#admin-console).
Here is just an outline:
- create a realm named `sftpgo`
- in "Realm Settings" -> "Login" adjust the "Require SSL" setting as per your requirements
- create a client named `sftpgo-client`
- for the `sftpgo-client` set the `Access Type` to `confidential` and a valid redirect URI, for example if your SFTPGo instance is running on `http://192.168.1.50:8080` a valid redirect URI is `http://192.168.1.50:8080/*`
- for the `sftpgo-client`, in the `Mappers` settings, make sure that the username and the sftpgo role are added to the ID token. For example you can add the user attribute `sftpgo_role` as JSON string to the ID token and the `username` as `preferred_username` JSON string to the ID token
- for your users who need to be mapped as SFTPGo administrators add a custom attribute specifying `sftpgo_role` as key and `admin` as value
The resulting JSON configuration for the `sftpgo-client` that you can obtain from the "Installation" tab is something like this:
```json
{
"realm": "sftpgo",
"auth-server-url": "http://192.168.1.12:8086/auth/",
"ssl-required": "none",
"resource": "sftpgo-client",
"credentials": {
"secret": "jRsmE0SWnuZjP7djBqNq0mrf8QN77j2c"
},
"confidential-port": 0
}
```
Add the following configuration parameters to the SFTPGo configuration file (or use env vars to set them):
```json
...
"oidc": {
"client_id": "sftpgo-client",
"client_secret": "jRsmE0SWnuZjP7djBqNq0mrf8QN77j2c",
"config_url": "http://192.168.1.12:8086/auth/realms/sftpgo",
"redirect_base_url": "http://192.168.1.50:8080",
"username_field": "preferred_username",
"role_field": "sftpgo_role"
}
...
```
From SFTPGo login page click `Login with OpenID` button, you will be redirected to the Keycloak login page, after a successful authentication Keyclock will redirect back to SFTPGo Web Admin or SFTPGo Web Client.
Please note that the ID token returned from Keycloak must contain the `username_field` specified in the SFTPGo configuration and optionally the `role_field`. The mapped usernames must exist in SFTPGo.
Here is an example ID token which allows the SFTPGo admin `root` to access to the Web Admin UI.
```json
{
"exp": 1644758026,
"iat": 1644757726,
"auth_time": 1644757647,
"jti": "c6cf172d-08d6-41cf-8e5d-20b7ac0b8011",
"iss": "http://192.168.1.12:8086/auth/realms/sftpgo",
"aud": "sftpgo-client",
"sub": "48b0de4b-3090-4315-bbcb-be63c48be1d2",
"typ": "ID",
"azp": "sftpgo-client",
"nonce": "XLxfYDhMmWwiYctgLTCZjC",
"session_state": "e20ab97c-d3a9-4e53-872d-09d104cbd286",
"at_hash": "UwubF1W8H0XItHU_DIpjfQ",
"acr": "0",
"sid": "e20ab97c-d3a9-4e53-872d-09d104cbd286",
"email_verified": false,
"preferred_username": "root",
"sftpgo_role": "admin"
}
```
And the following is an example ID token which allows the SFTPGo user `user1` to access to the Web Client UI.
```json
{
"exp": 1644758183,
"iat": 1644757883,
"auth_time": 1644757647,
"jti": "939de932-f941-4b04-90fc-7071b7cc6b10",
"iss": "http://192.168.1.12:8086/auth/realms/sftpgo",
"aud": "sftpgo-client",
"sub": "48b0de4b-3090-4315-bbcb-be63c48be1d2",
"typ": "ID",
"azp": "sftpgo-client",
"nonce": "wxcWPPi3H7ktembUdeToqQ",
"session_state": "e20ab97c-d3a9-4e53-872d-09d104cbd286",
"at_hash": "RSDpwzVG_6G2haaNF0jsJQ",
"acr": "0",
"sid": "e20ab97c-d3a9-4e53-872d-09d104cbd286",
"email_verified": false,
"preferred_username": "user1"
}
```
SFTPGo users (not admins) can be created/updated after successful OpenID authentication by defining a [pre-login hook](./dynamic-user-mod.md).