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worker.py
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worker.py
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import grp
import json
import logging
import os
import pwd
import gevent
import traceback
import setproctitle
import sys
from gevent.event import Event
from jadi import Context
import aj
from aj.api.http import SocketEndpoint, HttpMiddleware
from aj.http import HttpMiddlewareAggregator, HttpContext
from aj.auth import AuthenticationMiddleware, AuthenticationService
from aj.routing import CentralDispatcher
from aj.log import set_log_params, init_log_forwarding
class WorkerSocketNamespace():
def __init__(self, context, _id):
self.context = context
self.id = _id
logging.debug(f'Socket namespace {self.id} created')
self.endpoints = [
cls(self.context)
for cls in SocketEndpoint.classes()
]
def process_event(self, event, msg):
for endpoint in self.endpoints:
if not msg or msg['plugin'] in ['*', endpoint.plugin]:
data = msg['data'] if msg else None
try:
getattr(endpoint, f'on_{event}')(data)
# pylint: disable=W0703
except Exception:
logging.error('Exception in socket event handler')
traceback.print_exc()
def destroy(self):
logging.debug(f'Socket namespace {self.id} is being destroyed')
for endpoint in self.endpoints:
endpoint.destroy()
class Worker():
def __init__(self, stream, gate):
aj.worker = self
self.stream = stream
self.gate = gate
aj.master = False
os.setpgrp()
setproctitle.setproctitle(f'{sys.argv[0]} worker [{self.gate.name}]')
set_log_params(tag=self.gate.log_tag)
init_log_forwarding(self.send_log_event)
logging.info(
f'New worker "{self.gate.name}" PID {os.getpid()}, '
f'EUID {os.geteuid()}, EGID {os.getegid()}'
)
self.context = Context(parent=aj.context)
self.context.session = self.gate.session
self.context.worker = self
self.handler = HttpMiddlewareAggregator([
AuthenticationMiddleware.get(self.context),
CentralDispatcher.get(self.context),
])
self._master_config_reloaded = Event()
def demote(self, uid, gid=None):
try:
username = pwd.getpwuid(uid).pw_name
if not gid:
gid = pwd.getpwuid(uid).pw_gid
except KeyError:
username = None
gid = uid
if os.getuid() == uid:
return
if os.getuid() != 0:
logging.warning('Running as a limited user, setuid() unavailable!')
return
logging.info(
f'Worker {os.getpid()} is demoting to UID {uid} / GID {gid}...'
)
groups = [
g.gr_gid
for g in grp.getgrall()
if username in g.gr_mem or g.gr_gid == gid
]
os.setgroups(groups)
os.setgid(gid)
os.setuid(uid)
logging.info(f'...done, new EUID {os.geteuid()} EGID {os.getegid()}')
def run(self):
if self.gate.restricted:
restricted_user = aj.config.data['restricted_user']
self.demote(pwd.getpwnam(restricted_user).pw_uid)
else:
if self.gate.initial_identity:
AuthenticationService.get(self.context).login(
self.gate.initial_identity, demote=True
)
try:
socket_namespaces = {}
while True:
rq = self.stream.recv()
if not rq:
return
if rq.object['type'] == 'http':
gevent.spawn(self.handle_http_request, rq)
if rq.object['type'] == 'socket':
msg = rq.object['message']
nsid = rq.object['namespace']
event = rq.object['event']
if event == 'connect':
socket_namespaces[nsid] = WorkerSocketNamespace(
self.context, nsid
)
socket_namespaces[nsid].process_event(event, msg)
if event == 'disconnect':
socket_namespaces[nsid].destroy()
logging.debug('Socket disconnected, destroying endpoints')
if rq.object['type'] == 'config-data':
logging.debug('Received a config update')
aj.config.data = rq.object['data']['config']
aj.users.data = rq.object['data']['users']
aj.tfa_config.data = rq.object['data']['tfa']
self._master_config_reloaded.set()
if rq.object['type'] == 'session-list':
logging.debug('Received a session list update')
aj.sessions = rq.object['data']
if rq.object['type'] == 'verify-totp':
userid = rq.object['data']['userid']
result = rq.object['data']['result']
aj.tfa_config.verify_totp[userid] = result
if rq.object['type'] == 'update-tfa-config':
aj.tfa_config.data = rq.object['data']
# pylint: disable=W0703
except Exception:
logging.error('Worker crashed!')
traceback.print_exc()
def terminate(self):
self.send_to_upstream({
'type': 'terminate',
})
def change_totp(self, data):
self.send_to_upstream({
'type': 'change-totp',
'data': data,
})
def verify_totp(self, userid, code):
self.send_to_upstream({
'type': 'verify-totp',
'userid': userid,
'code': code,
})
def update_sessionlist(self):
self.send_to_upstream({
'type': 'update-sessionlist',
})
def restart_master(self):
self.send_to_upstream({
'type': 'restart-master',
})
def reload_master_config(self):
self.send_to_upstream({
'type': 'reload-config',
})
self._master_config_reloaded.wait()
self._master_config_reloaded.clear()
def send_log_event(self, method, message, *args, **kwargs):
self.send_to_upstream({
'type': 'log',
'method': method,
'message': message % args,
'kwargs': kwargs,
})
def handle_http_request(self, rq):
response_object = {
'type': 'http',
}
try:
http_context = HttpContext.deserialize(rq.object['context'].encode())
logging.debug(
f' ... {http_context.method} {http_context.path}'
)
# Generate response
stack = HttpMiddleware.all(self.context)
content = HttpMiddlewareAggregator(stack + [self.handler]).handle(http_context)
# ---
http_context.add_header('X-Worker-Name', str(self.gate.name))
response_object['content'] = list(content)
response_object['status'] = http_context.status
response_object['headers'] = http_context.headers
self.stream.reply(rq, response_object)
# pylint: disable=W0703
except Exception as e:
logging.error(traceback.format_exc())
response_object.update({
'error': str(e),
'exception': repr(e),
})
self.stream.reply(rq, response_object)
def send_to_upstream(self, obj):
self.stream.reply(None, obj)
class WorkerError(Exception):
def __init__(self, response):
Exception.__init__(self)
self.response = response
def __str__(self):
return json.dumps(self.response)[:1000]