314 lines
7.8 KiB
Python
Executable file
314 lines
7.8 KiB
Python
Executable file
#!/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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from pkg_resources import parse_version
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def memoize(func):
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"""
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Decorator function to cache the results of another function call
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"""
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cache = dict()
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def memoized_func(*args):
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if args in cache:
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return cache[args]
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result = func(*args)
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cache[args] = result
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return result
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return memoized_func
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@memoize
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def bwcli_version():
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"""
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Function to return the version of the Bitwarden CLI
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"""
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proc = subprocess.Popen(
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[
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'bw',
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'--version'
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],
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stdout=subprocess.PIPE
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)
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(stdout, _) = proc.communicate()
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if proc.returncode:
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raise RuntimeError('Unable to fetch Bitwarden CLI version')
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return stdout.decode('utf-8')
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@memoize
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def cli_supports(feature):
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"""
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Function to return whether the current Bitwarden CLI supports a particular
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feature
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"""
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version = parse_version(bwcli_version())
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if feature == 'nointeraction' and version >= parse_version('1.9.0'):
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return True
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return False
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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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list(filter(None, [
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'bw',
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'--raw',
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(None, '--nointeraction')[cli_supports('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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list(filter(None, [
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'bw',
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(None, '--nointeraction')[cli_supports('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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list(filter(None, [
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'bw',
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(None, '--nointeraction')[cli_supports('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 SSH 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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# FIXME: avoid temporary files, if possible (StringIO ?)
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with tempfile.NamedTemporaryFile() as tmpfile:
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proc = subprocess.Popen(
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list(filter(None, [
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'bw',
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(None, '--nointeraction')[cli_supports('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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