WebSSH

Introduction

A simple web application to be used as an ssh client to connect to your ssh servers. It is written in Python, base on tornado and paramiko.

+---------+     http     +--------+    ssh    +-----------+                         
| browser | <==========> | webssh | <=======> | ssh server|
+---------+   websocket  +--------+    ssh    +-----------+

Features

• SSH password authentication supported, including empty password.
• SSH public-key authentication supported, including DSA RSA ECDSA Ed25519 keys.
• Encrypted keys supported.
• Fullscreen terminal supported.
• Terminal window resizable.
• Auto detect the ssh server's default encoding.

Preview

Requirement

• Python 2.7/3.4+

Instructions

pip install webssh
wssh

Options

# listen address and port
wssh --address='0.0.0.0' --port=8000

# missing host key policy
wssh --policy=reject

# logging level
wssh --logging=debug

# log to file
wssh --log-file-prefix=main.log

# more options
wssh --help

Tests

Use unittest to run all tests

python -m unittest discover tests

Use pytest to run all tests

python -m pytest tests

An example of config for running this app behind an Nginx server

location / {
    proxy_pass http://127.0.0.1:8888;
    proxy_http_version 1.1;
    proxy_read_timeout 300;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_set_header Host $http_host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Real-PORT $remote_port;
}

Tips

• Try to use Nginx as a front web server (see config example above) and enable SSL, this will prevent your ssh credentials from being uncovered. Also afterwards the communication between your browser and the web server will be encrypted as they use secured websockets.
• Try to use reject policy as the missing host key policy along with your verified known_hosts, this will prevent man-in-the-middle attacks. The idea is that it checks the system host keys file("~/.ssh/known_hosts") and the application host keys file("./known_hosts") in order, if the ssh server's hostname is not found or the key is not matched, the connection will be aborted.