friwall/web/vpn.py

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2022-01-03 10:33:02 +00:00
import datetime
import ipaddress
import json
import re
import subprocess
import flask
import flask_login
from . import system
from . import db
blueprint = flask.Blueprint('vpn', __name__, url_prefix='/vpn')
wgkey_regex = re.compile(r'^[A-Za-z0-9/+=]{44}$')
@blueprint.route('/')
@flask_login.login_required
def index():
return flask.render_template('vpn/index.html')
@blueprint.route('/list')
@flask_login.login_required
def list():
try:
user = flask_login.current_user.get_id()
return flask.jsonify({k: v for k, v in db.load('wireguard').items() if v.get('user') == user})
except Exception as e:
return flask.Response(f'failed: {e}', status=500, mimetype='text/plain')
@blueprint.route('/new', methods=('POST',))
@flask_login.login_required
def new():
pubkey = flask.request.json.get('pubkey', '')
if not re.match(wgkey_regex, pubkey):
return flask.Response('invalid key', status=400, mimetype='text/plain')
try:
settings = db.load('settings')
server_pubkey = subprocess.run([f'wg pubkey'], input=settings.get('wg_key'),
text=True, capture_output=True, shell=True).stdout.strip()
with db.locked('wireguard'):
# Find a free address for the new key.
ips = db.read('wireguard')
network = ipaddress.ip_network(settings.get('wg_net', '10.0.0.1/24'), strict=False)
for ip in network.hosts():
if str(ip) not in ips:
break
else:
return flask.Response('no more available IP addresses', status=500, mimetype='text/plain')
now = datetime.datetime.utcnow()
comment = re.sub('[^\w ]', '', flask.request.json.get('comment', ''))
ips[str(ip)] = {
'key': pubkey,
'time': now.timestamp(),
'user': flask_login.current_user.get_id(),
'comment': comment,
}
db.write('wireguard', ips)
# Generate a new config archive for firewall nodes.
system.run(system.save_config)
# Template arguments.
args = {
'server': f'{settings.get("wg_endpoint")}',
'port': f'{settings.get("wg_port", 51820)}',
'server_key': server_pubkey,
'pubkey': pubkey,
'ip': str(ip),
'timestamp': now,
'comment': comment,
'add_default': flask.request.json.get('add_default', False),
'use_dns': flask.request.json.get('use_dns', True),
}
return flask.render_template('vpn/wg-fri.conf', **args)
except Exception as e:
return flask.Response(f'something went catastrophically wrong: {e}',
status=400, mimetype='text/plain')
@blueprint.route('/del', methods=('POST',))
@flask_login.login_required
def delete():
pubkey = flask.request.json.get('pubkey', '')
if not wgkey_regex.match(pubkey):
return flask.Response('invalid key', status=400, mimetype='text/plain')
try:
with db.locked('wireguard'):
user = flask_login.current_user.get_id()
ips = {k: v for k, v in db.read('wireguard').items() if v.get('user') != user or v.get('key') != pubkey}
db.write('wireguard', ips)
system.run(system.save_config)
return flask.Response(f'deleted key {pubkey}', status=200, mimetype='text/plain')
except Exception as e:
return flask.Response(f'something went catastrophically wrong: {e}',
status=400, mimetype='text/plain')