Refactor to run within a single Python script
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README.md
35
README.md
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# Bitwarden SSH Agent
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## Requirements
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* You need to have the [Bitwarden CLI tool](https://github.com/bitwarden/cli) installed and available in the `$PATH` as `bw`.
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* `ssh-agent` must be running in the current session.
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* You need to have the bitwarden cli `bw` installed
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* ssh-agent must be running in the current session
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## What it does?
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* connects to bitwarden using the bitwarden cli
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* looks for a folder called `ssh-agent`
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* loads the ssh key for each item in that folder
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## What does it do?
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Fetches SSH keys stored in Bitwarden vault and adds them to `ssh-agent`.
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## How to use it
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`$ ./start.sh`
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Fill in you login information
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1. Run,
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```shell
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./bw_add_sshkeys.py
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```
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2. Enter your Bitwarden credentials, if a Bitwarden vault session is not already set.
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3. (optional) Enter your SSH keys' passphrases.
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## Storing the keys in BitWarden
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1. Create a folder called 'ssh-agent'
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2. Add an new secure note to that folder
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3. Upload the private_key as an attachment
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4. add the custom field `private`, containing the private key filename
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1. Create a folder called `ssh-agent` (can be overridden on the command line).
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2. Add an new secure note to that folder.
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3. Upload the private key as an attachment.
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4. Add the custom field `private` (can be overridden on the command line), containing the file name of the private key attachment.
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5. Repeat steps 2-4 for each subsequent key
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## Improvements to be made
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* Find a way to extract the attachment from bitwarden in memory, instead of creating a file for it
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* Find a way to extract the attachment from bitwarden in memory, instead of using a temporary file.
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261
bw_add_sshkeys.py
Executable file
261
bw_add_sshkeys.py
Executable file
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#!/usr/bin/env python3
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"""
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Extracts SSH keys from Bitwarden vault
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"""
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import argparse
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import getpass
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import json
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import logging
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import os
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import subprocess
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import sys
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import tempfile
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def get_session():
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"""
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Function to return a valid Bitwarden session
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"""
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# Check for an existing, user-supplied Bitwarden session
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try:
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if os.environ['BW_SESSION']:
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logging.debug('Existing Bitwarden session found')
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return os.environ['BW_SESSION']
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except KeyError:
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pass
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# Check if we're already logged in
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proc = subprocess.Popen(
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[
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'bw',
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'login',
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'--check',
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'--quiet'
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]
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)
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proc.wait()
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if proc.returncode:
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logging.debug('Not logged into Bitwarden')
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operation = 'login'
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credentials = [bytes(input('Bitwarden user: '), encoding='ascii')]
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else:
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logging.debug('Bitwarden vault is locked')
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operation = 'unlock'
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credentials = []
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# Ask for the password
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credentials.append(bytes(getpass.getpass('Bitwarden Vault password: '), encoding='ascii'))
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proc = subprocess.Popen(
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[
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'bw',
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'--raw',
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'--nointeraction',
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operation
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] + credentials,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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)
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(stdout, stderr) = proc.communicate()
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if proc.returncode:
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logging.error(stderr.decode('utf-8'))
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return None
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return stdout.decode('utf-8')
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def get_folders(session, foldername):
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"""
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Function to return the ID of the folder that matches the provided name
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"""
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logging.debug('Folder name: %s', foldername)
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proc = subprocess.Popen(
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[
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'bw',
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'--nointeraction',
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'list',
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'folders',
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'--search', foldername,
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'--session', session
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],
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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)
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(stdout, stderr) = proc.communicate()
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if proc.returncode:
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logging.error(stderr.decode('utf-8'))
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return None
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folders = json.loads(stdout)
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if not folders:
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logging.error('"%s" folder not found', foldername)
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return None
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# Do we have any folders
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if len(folders) != 1:
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logging.error('%d folders with the name "%s" found', len(folders), foldername)
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return None
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return folders[0]['id']
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def folder_items(session, folder_id):
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"""
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Function to return items from a folder
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"""
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logging.debug('Folder ID: %s', folder_id)
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proc = subprocess.Popen(
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[
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'bw',
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'--nointeraction',
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'list',
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'items',
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'--folderid', folder_id,
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'--session', session
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],
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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)
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(stdout, stderr) = proc.communicate()
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if proc.returncode:
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logging.error(stderr.decode('utf-8'))
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return None
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return json.loads(stdout)
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def add_ssh_keys(session, items, keyname):
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"""
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Function to attempt to get keys from a vault item
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"""
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for item in items:
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try:
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private_key_file = [k['value'] for k in item['fields']
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if k['name'] == keyname and k['type'] == 0][0]
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except IndexError:
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logging.warning('No "%s" field found for item %s', keyname, item['name'])
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continue
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logging.debug('Private key file declared')
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try:
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private_key_id = [k['id'] for k in item['attachments']
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if k['fileName'] == private_key_file][0]
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except IndexError:
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logging.warning(
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'No attachment called "%s" found for item %s',
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private_key_file,
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item['name']
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)
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continue
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logging.debug('Private key ID found')
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if not ssh_add(session, item['id'], private_key_id):
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logging.warning('Could not add key to the SSD agent')
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def ssh_add(session, item_id, key_id):
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"""
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Function to get the key contents from the Bitwarden vault
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"""
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logging.debug('Item ID: %s', item_id)
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logging.debug('Key ID: %s', key_id)
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# TODO: avoid temporary files, if possible
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with tempfile.NamedTemporaryFile() as tmpfile:
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proc = subprocess.Popen(
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[
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'bw',
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'--nointeraction',
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'--quiet',
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'get',
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'attachment', key_id,
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'--itemid', item_id,
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'--output', tmpfile.name,
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'--session', session
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],
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stderr=subprocess.PIPE
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)
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(_, stderr) = proc.communicate()
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if proc.returncode:
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logging.error(stderr.decode('utf-8'))
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return False
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logging.debug("Running ssh-add")
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# CAVEAT: `ssh-add` provides no useful output, even with maximum verbosity
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proc = subprocess.Popen(['ssh-add', tmpfile.name])
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proc.wait()
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if proc.returncode:
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return False
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return True
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if __name__ == '__main__':
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def parse_args():
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"""
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Function to parse command line arguments
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"""
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parser = argparse.ArgumentParser()
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parser.add_argument(
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'-d', '--debug',
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action='store_true',
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help='show debug output',
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)
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parser.add_argument(
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'-f', '--foldername',
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default='ssh-agent',
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help='folder name to use to search for SSH keys',
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)
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parser.add_argument(
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'-c', '--customfield',
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default='private',
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help='custom field name where private key filename is stored',
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)
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return parser.parse_args()
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def main():
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"""
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Main program logic
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"""
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args = parse_args()
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if args.debug:
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loglevel = logging.DEBUG
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else:
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loglevel = logging.INFO
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logging.basicConfig(level=loglevel)
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logging.info('Getting Bitwarden session')
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session = get_session()
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if not session:
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sys.exit(1)
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logging.debug('Session = %s', session)
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logging.info('Getting folder list')
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folder_id = get_folders(session, args.foldername)
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if not folder_id:
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sys.exit(2)
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logging.info('Getting folder items')
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items = folder_items(session, folder_id)
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if not items:
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sys.exit(3)
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logging.info('Attempting to add keys to ssh-agent')
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add_ssh_keys(session, items, args.customfield)
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main()
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68
ssh.py
68
ssh.py
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@ -1,68 +0,0 @@
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import subprocess
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import os
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import sys
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import json
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import tempfile
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from urllib.parse import urlparse, urlencode
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from urllib.request import urlopen, Request
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from urllib.error import HTTPError
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try:
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subprocess.check_output(['bw', 'logout'])
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except:
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pass
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try:
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session = subprocess.check_output(['bw', '--raw', 'login'])
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session = ['--session', session]
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except:
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print('Couldnt login!')
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sys.exit(1)
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try:
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folders = subprocess.check_output(['bw','list', 'folders', '--search', 'ssh-agent'] + session)
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folders = json.loads(folders)
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if not folders:
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raise AttributeError
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if len(folders) != 1:
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raise ValueError
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except AttributeError:
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print('Couldnt find ssh-agent folder!')
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sys.exit(1)
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except ValueError:
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print('More than one ssh-agent folder found!')
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sys.exit(1)
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except:
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print('Error retrieving folders.')
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sys.exit(1)
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folder = folders[0]['id']
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try:
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items = subprocess.check_output(['bw', 'list', 'items', '--folderid', folder, 'ssh-agent'] + session)
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items = json.loads(items)
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except Exception as e:
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print('Cant fint items.')
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print(e)
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sys.exit(1)
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keys = []
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directory = tempfile.TemporaryDirectory()
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temporary_file_name = os.path.join(directory.name + './private_key')
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try:
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for item in items:
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private_key_file = [k['value'] for k in item['fields'] if k['name'] == 'private' and k['type'] == 0][0]
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private_key_id = [k['id'] for k in item['attachments'] if k['fileName'] == private_key_file][0]
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# would be nice if there was an option to retrieve the attachment file directly to the stdout
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subprocess.check_output(['bw', 'get', 'attachment', private_key_id, '--itemid', item['id'], '--output', temporary_file_name] + session)
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private_key = open(temporary_file_name, 'r').read()
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os.remove(temporary_file_name)
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keys.append({'private_key': private_key})
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except:
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print('Something happened.')
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sys.exit(1)
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print(';'.join([k['private_key'] for k in keys]))
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