/
app.py
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app.py
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from pritunl.exceptions import *
from pritunl.constants import *
from pritunl.helpers import *
from pritunl import logger
from pritunl import journal
from pritunl import settings
from pritunl import utils
from pritunl import monitoring
from pritunl import auth
from pritunl import acme
import threading
import flask
import time
import subprocess
import os
import base64
import cheroot.wsgi
import ssl
app = flask.Flask(__name__)
app_server = None
_cur_ssl = None
_cur_cert = None
_cur_key = None
_cur_port = None
_cur_redirect_server = None
_cur_reverse_proxy = None
_update_lock = threading.Lock()
_watch_event = threading.Event()
def update_server(delay=0):
global _cur_ssl
global _cur_cert
global _cur_key
global _cur_port
global _cur_redirect_server
global _cur_reverse_proxy
if not settings.local.server_ready.is_set():
return
_update_lock.acquire()
if settings.local.web_state == DISABLED:
logger.warning(
'Web server disabled',
'server',
message=settings.local.notification,
)
stop_server()
return
try:
if _cur_ssl != settings.app.server_ssl or \
_cur_cert != settings.app.server_cert or \
_cur_key != settings.app.server_key or \
_cur_port != settings.app.server_port or \
_cur_redirect_server != settings.app.redirect_server or \
_cur_reverse_proxy != (settings.app.reverse_proxy_header if
settings.app.reverse_proxy else ''):
logger.info('Settings changed, restarting server...', 'app',
ssl_changed=_cur_ssl != settings.app.server_ssl,
cert_changed=_cur_cert != settings.app.server_cert,
key_changed=_cur_key != settings.app.server_key,
port_changed=_cur_port != settings.app.server_port,
redirect_server_changed=_cur_redirect_server !=
settings.app.redirect_server,
reverse_proxy_changed= _cur_reverse_proxy != (
settings.app.reverse_proxy_header if
settings.app.reverse_proxy else ''),
)
_cur_ssl = settings.app.server_ssl
_cur_cert = settings.app.server_cert
_cur_key = settings.app.server_key
_cur_port = settings.app.server_port
_cur_redirect_server = settings.app.redirect_server
_cur_reverse_proxy = settings.app.reverse_proxy_header if \
settings.app.reverse_proxy else ''
if settings.app.server_auto_restart:
restart_server(delay=delay)
finally:
_update_lock.release()
def stop_server(delay=0):
_watch_event.clear()
def thread_func():
time.sleep(delay)
set_app_server_interrupt()
if app_server:
app_server.interrupt = ServerStop('Stop')
time.sleep(1)
clear_app_server_interrupt()
thread = threading.Thread(target=thread_func)
thread.daemon = True
thread.start()
def restart_server(delay=0):
_watch_event.clear()
def thread_func():
time.sleep(delay)
set_app_server_interrupt()
if app_server:
app_server.interrupt = ServerRestart('Restart')
time.sleep(1)
clear_app_server_interrupt()
thread = threading.Thread(target=thread_func)
thread.daemon = True
thread.start()
def restart_server_fast():
_watch_event.clear()
set_app_server_interrupt()
if app_server:
app_server.interrupt = ServerRestart('Restart')
time.sleep(1)
clear_app_server_interrupt()
@app.before_request
def before_request():
flask.g.valid = False
flask.g.start = time.time()
@app.after_request
def after_request(response):
if settings.app.check_requests and not flask.g.valid:
raise ValueError('Request not authorized')
response.headers.add('X-Frame-Options', 'DENY')
response.headers.add('X-XSS-Protection', '1; mode=block')
response.headers.add('X-Content-Type-Options', 'nosniff')
response.headers.add('X-Robots-Tag', 'noindex')
if settings.app.server_ssl or settings.app.reverse_proxy:
response.headers.add(
'Strict-Transport-Security',
'max-age=31536000; includeSubDomains')
if not flask.request.path.startswith('/event'):
monitoring.insert_point('requests', {
'host': settings.local.host.name,
}, {
'path': flask.request.path,
'remote_ip': utils.get_remote_addr(),
'response_time': int((time.time() - flask.g.start) * 1000),
})
return response
@app.route('/.well-known/acme-challenge/<token>', methods=['GET'])
@auth.open_auth
def acme_token_get(token):
token = utils.filter_str(token[:96])
authorization = acme.get_authorization(token)
if authorization:
return flask.Response(authorization, mimetype='text/plain')
return flask.abort(404)
def _run_server(restart):
global app_server
systemd = settings.app.web_systemd
if systemd and not utils.systemd_available():
logger.info('Systemd not available, skipping web service', 'app')
systemd = False
try:
context = subprocess.check_output(
['id', '-Z'],
stderr=subprocess.PIPE,
).decode().strip()
except:
context = 'none'
journal.entry(
journal.WEB_SERVER_START,
selinux_context=context,
ssl_version=ssl.OPENSSL_VERSION,
)
logger.info('Starting server', 'app',
selinux_context=context,
ssl_version=ssl.OPENSSL_VERSION,
)
app_server = cheroot.wsgi.Server(
('localhost', settings.app.server_internal_port),
app,
request_queue_size=settings.app.request_queue_size,
accepted_queue_size=settings.app.request_accepted_queue_size,
numthreads=settings.app.request_thread_count,
max=settings.app.request_max_thread_count,
shutdown_timeout=3,
)
app_server.server_name = ''
server_cert = None
server_key = None
redirect_server = 'true' if settings.app.redirect_server else 'false'
internal_addr = 'localhost:%s' % settings.app.server_internal_port
app.config.update(
SESSION_COOKIE_HTTPONLY=True,
SESSION_COOKIE_SECURE=True,
)
if settings.app.server_ssl:
setup_server_cert()
server_cert = base64.b64encode(
settings.app.server_cert.encode()).decode()
server_key = base64.b64encode(
settings.app.server_key.encode()).decode()
if not restart:
settings.local.server_ready.set()
settings.local.server_start.wait()
if systemd:
with open(SYSTEMD_WEB_ENV_PATH, 'w') as systemd_env_file:
os.chmod(SYSTEMD_WEB_ENV_PATH, 0o600)
systemd_env_file.write(WEB_SYSTEMD_ENV_TEMPLATE % (
settings.app.reverse_proxy_header if
settings.app.reverse_proxy else '',
settings.app.reverse_proxy_proto_header if
settings.app.reverse_proxy else '',
redirect_server,
settings.conf.bind_addr,
str(settings.app.server_port),
internal_addr,
server_cert or '',
server_key or '',
))
utils.systemd_start(SYSTEMD_WEB_SERVICE)
def poll_thread():
while True:
time.sleep(1)
if utils.systemd_is_active(SYSTEMD_WEB_SERVICE):
continue
if not check_global_interrupt():
logger.error('Web server process exited unexpectedly',
'app')
time.sleep(1)
restart_server(1)
break
thread = threading.Thread(target=poll_thread)
thread.daemon = True
thread.start()
else:
process_state = True
process = subprocess.Popen(
['pritunl-web'],
env=dict(os.environ, **{
'REVERSE_PROXY_HEADER': settings.app.reverse_proxy_header if \
settings.app.reverse_proxy else '',
'REVERSE_PROXY_PROTO_HEADER': \
settings.app.reverse_proxy_proto_header if \
settings.app.reverse_proxy else '',
'REDIRECT_SERVER': redirect_server,
'BIND_HOST': settings.conf.bind_addr,
'BIND_PORT': str(settings.app.server_port),
'INTERNAL_ADDRESS': internal_addr,
'SSL_CERT': server_cert or '',
'SSL_KEY': server_key or '',
}),
)
def poll_thread():
time.sleep(0.5)
if process.wait() and process_state:
time.sleep(0.25)
if not check_global_interrupt():
logger.error('Web server process exited unexpectedly',
'app')
time.sleep(1)
restart_server(1)
thread = threading.Thread(target=poll_thread)
thread.daemon = True
thread.start()
_watch_event.set()
try:
app_server.start()
except (KeyboardInterrupt, SystemExit):
return
except ServerRestart:
raise
except ServerStop:
return
except:
logger.exception('Server error occurred', 'app')
raise
finally:
process_state = False
try:
if systemd:
utils.systemd_stop(SYSTEMD_WEB_SERVICE)
else:
process.kill()
except:
pass
def _run_wsgi():
restart = False
while True:
try:
if settings.local.web_state == DISABLED:
time.sleep(1)
continue
_run_server(restart)
except ServerRestart:
restart = True
logger.info('Server restarting...', 'app')
def setup_server_cert():
global _cur_cert
global _cur_key
if not settings.app.server_cert or not settings.app.server_key:
logger.info('Generating server certificate...', 'app')
utils.create_server_cert()
settings.commit()
_cur_cert = settings.app.server_cert
_cur_key = settings.app.server_key
def run_server():
global _cur_ssl
global _cur_cert
global _cur_key
global _cur_port
global _cur_redirect_server
global _cur_reverse_proxy
_cur_ssl = settings.app.server_ssl
_cur_cert = settings.app.server_cert
_cur_key = settings.app.server_key
_cur_port = settings.app.server_port
_cur_redirect_server = settings.app.redirect_server
_cur_reverse_proxy = settings.app.reverse_proxy_header if \
settings.app.reverse_proxy else ''
logger.LogEntry(message='Web server started.')
_run_wsgi()