About?

cryptgeon is a secure, open source sharing note or file service inspired by PrivNote

Demo

Check out the demo and see for yourself https://cryptgeon.nicco.io.

Features

• server cannot decrypt contents due to client side encryption
• view or time constraints
• in memory, no persistence
• obligatory dark mode support

How does it work?

each note has a generated id (256bit) and key 256(bit). The id is used to save & retrieve the note. the note is then encrypted with aes in gcm mode on the client side with the key and then sent to the server. data is stored in memory and never persisted to disk. the server never sees the encryption key and cannot decrypt the contents of the notes even if it tried to.

Screenshot

Environment Variables

Variable	Default	Description
MEMCACHE	memcached:11211	Memcached URL to connect to.
SIZE_LIMIT	1 KiB	Max size for body. Accepted values according to byte-unit

Deployment

ℹ️ https is required otherwise browsers will not support the cryptographic functions.

Docker

Docker is the easiest way. There is the official image here.

# docker-compose.yml

version: '3.7'

services:
  memcached:
    image: memcached:1-alpine
    entrypoint: memcached -m 128M -I 4M # Limit to 128 MB Ram, 4M per entry, customize at free will.

  app:
    image: cupcakearmy/cryptgeon:latest
    depends_on:
      - memcached
    environment:
      SIZE_LIMIT: 4M
    ports:
      - 80:5000

NGINX Proxy

See the examples/nginx folder. There an example with a simple proxy, and one with https. You need to specify the server names and certificates.

Traefik 2

Assumptions:

• External proxy docker network proxy
• A certificate resolver le
• A https entrypoint secure
• Domain name example.org

version: '3.8'

networks:
  proxy:
    external: true

services:
  memcached:
    image: memcached:1-alpine
    restart: unless-stopped
    entrypoint: memcached -m 128M -I 4M # Limit to 128 MB Ram, 4M per entry, customize at free will.

  app:
    image: cupcakearmy/cryptgeon:latest
    restart: unless-stopped
    depends_on:
      - memcached
    networks:
      - default
      - proxy
    labels:
      - traefik.enable=true
      - traefik.http.routers.cryptgeon.rule=Host(`example.org`)
      - traefik.http.routers.cryptgeon.entrypoints=secure
      - traefik.http.routers.cryptgeon.tls.certresolver=le

Development

1. Clone
2. run pnpm i in the root and and client client/ folders.
3. Run pnpm run dev to start development.

Running npm run dev in the root folder will start the following things

• a memcache docker container
• rust backend with hot reload
• client with hot reload

You can see the app under localhost:1234.

Attributions

Icons made by freepik from www.flaticon.com