Delrey

Delrey is a very small remote shell access toolkit. It uses JDK's standard ProcessBuilder API to spawn processes via commands received from the Master server through WebSocket connection.

It is not really stable and is not intended to be used in production environments. I made it because I needed simple and lightweight solution to control (well, try to) my devices.

Usage

You have to boot up your own Delrey Master server which the clients will connect to. Then you can run client binaries on any host you would like to control remotely.

Clone the repo:

git clone https://github.com/d1snin/delrey
cd delrey

Configuring Delrey Master server

Copy environment configuration:

cp ./delrey-master/.env.tmp ./delrey-master/.env

Now provide your own configuration in ./delrey-master/.env. I advise you modifying only the server token property: DELREY_MASTER_SECURITY_TOKEN It is used for authorization process.

The preferred way to run Delrey Master is using Docker + Docker Compose

Build Docker image:

./gradlew delrey-master:publishImageToLocalRegistry

Run Docker container:

docker-compose -f ./delrey-master/docker/docker-compose.yml up -d

Configuring Delrey Daemon

Build Daemon distribution (you can also download it as Actions artifact)

./gradlew delrey-daemon:shadowJar

Run distribution (minimum JRE version is 11):

java -jar masterHttpBase=... masterWsBase=... whoami=...

Where: masterHttpBase: Base HTTP URL of Delrey Master server, e.g. https://rc.d1s.dev
masterWsBase: Base WebSocket URL of Delrey Master server, e.g. wss://rc.d1s.dev
whoami: Current host identifier. Any value, e.g. my-laptop

Note: provided configuration will be automatically stored in current working directory, so there is no need to repeat the same configuration each run.

I suggest configuring your system to run Daemon distribution on startup.

Sending requests

Fetch current Master server status via GET /status:

GET https://rc.example.com/status

HTTP/1.1 200 OK
Content-Length: 49
Content-Type: application/json
Connection: keep-alive

{
    "version": "0.0.1",
    "state": "UP",
    "hosts": [
        "test"
    ]
}

Post command to host via POST /runs

POST https://rc.example.com/runs
Content-Type: application/json
Authorization: <token>

{
    "command": "<command (e.g. pwd)>",
    "host": "<host name (whoami)>"
}

HTTP/1.1 202 Accepted
Content-Length: 151
Content-Type: application/json
Connection: keep-alive

{
    "id": "a34b4887-ec04-434a-b3ff-af426be4ec25",
    "command": "pwd",
    "host": "test",
    "pid": null,
    "output": null,
    "status": null,
    "error": null
    "finished": false
}

You can also wait for run completion by specifying wait query parameter set to true:

POST https://rc.example.com/runs?wait=true
Content-Type: application/json
Authorization: <token>

{
    "command": "<command (e.g. pwd)>",
    "host": "<host name (whoami)>"
}

HTTP/1.1 200 OK
Content-Length: 191
Content-Type: application/json
Connection: keep-alive

{
    "id": "d506d2dd-c566-4812-aae9-64fc1b01c392",
    "command": "pwd",
    "host": "test",
    "pid": 34063,
    "output": "/home/d1snin/projects/delrey",
    "status": 0,
    "error": null,
    "finished": true
}

Get run state via GET /runs/{id}

GET https://rc.example.com/runs/<run id>
Content-Type: application/json
Authorization: <token>

HTTP/1.1 200 OK
Content-Length: 148
Content-Type: application/json
Connection: keep-alive

{
    "id": "a34b4887-ec04-434a-b3ff-af426be4ec25",
    "command": "pwd",
    "host": "test",
    "pid": 34060,
    "output": "/home/d1snin/projects/delrey",
    "status": null,
    "error": null,
    "finished": true
}

Get runs by host via GET /runs?host={host alias}

GET https://rc.example.com/runs?host=<host alias>
Authorization: <token>

HTTP/1.1 200 OK
Content-Length: 193
Content-Type: application/json
Connection: keep-alive

[
    {
        "id": "3ed2bcde-207d-4970-8f8e-3b39d6be9626",
        "command": "pwd",
        "host": "test",
        "pid": 56675,
        "output": "/home/d1snin/projects/delrey",
        "status": 0,
        "error": null,
        "finished": true
    }
]

Code of Conduct

Please refer to CODE_OF_CONDUCT.md.

License

Copyright 2023 Mikhail Titov <me@d1s.dev>

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.