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#!/usr/bin/env python3
# noinspection PyUnresolvedReferences
import falcon
import os
import logging
import json
import sqlalchemy as sa
from nacl.signing import VerifyKey
from nacl.encoding import Base64Encoder
from nacl.exceptions import BadSignatureError
DB_VERSION = 1
logger = logging.getLogger('b4-send-receive')
# noinspection PyBroadException, PyMethodMayBeStatic
class SendReceiveListener(object):
def __init__(self, _engine):
self._engine = _engine
# You shouldn't use this in production
if self._engine.driver == 'pysqlite':
self._init_sa_db()
def _init_sa_db(self):
logger.info('Creating tables')
conn = self._engine.connect()
md = sa.MetaData()
meta = sa.Table('meta', md,
sa.Column('version', sa.Integer())
)
auth = sa.Table('auth', md,
sa.Column('auth_id', sa.Integer(), primary_key=True),
sa.Column('created', sa.DateTime(), nullable=False, server_default=sa.sql.func.now()),
sa.Column('email', sa.Text(), nullable=False),
sa.Column('name', sa.Text(), nullable=False),
sa.Column('pubkey', sa.Text(), nullable=False),
)
sa.Index('idx_email_pubkey', auth.c.pubkey, auth.c.email, unique=True)
challenge = sa.Table('challenge', md,
sa.Column('challenge_id', sa.Integer(), primary_key=True),
sa.Column('created', sa.DateTime(), nullable=False, server_default=sa.sql.func.now()),
sa.Column('pubkey', sa.Text(), nullable=False),
sa.Column('email', sa.Text(), nullable=False),
sa.Column('challenge', sa.Text(), nullable=False),
)
sa.Index('idx_uniq_challenge', challenge.c.pubkey, challenge.c.email, challenge.c.challenge, unique=True)
md.create_all(self._engine)
q = sa.insert(meta).values(version=DB_VERSION)
conn.execute(q)
def on_get(self, req, resp): # noqa
resp.status = falcon.HTTP_200
resp.content_type = falcon.MEDIA_TEXT
resp.text = "We don't serve GETs here\n"
def send_error(self, resp, message):
resp.status = falcon.HTTP_500
resp.text = json.dumps({'result': 'error', 'message': message})
def send_success(self, resp, message):
resp.status = falcon.HTTP_200
resp.text = json.dumps({'result': 'success', 'message': message})
def auth_new(self, jdata, resp):
# Is it already authorized?
conn = self._engine.connect()
md = sa.MetaData()
t_auth = sa.Table('auth', md, autoload=True, autoload_with=self._engine)
email = jdata.get('email')
pubkey = jdata.get('key')
q = sa.select([t_auth.c.auth_id]).where(t_auth.c.email == email, t_auth.c.pubkey == pubkey)
rp = conn.execute(q)
if len(rp.fetchall()):
self.send_error(resp, message='%s:%s is already authorized' % (email, pubkey))
return
# delete any existing challenges for this and create a new one
t_challenge = sa.Table('challenge', md, autoload=True, autoload_with=self._engine)
q = sa.delete(t_challenge).where(t_challenge.c.email == email, t_challenge.c.pubkey == pubkey)
conn.execute(q)
# create new challenge
import uuid
cstr = str(uuid.uuid4())
q = sa.insert(t_challenge).values(pubkey=pubkey, email=email, challenge=cstr)
conn.execute(q)
# TODO: Actual mail sending
logger.info('Challenge: %s', cstr)
self.send_success(resp, message='Challenge generated')
def auth_verify(self, jdata, resp):
# Do we have a record for this email/challenge?
conn = self._engine.connect()
md = sa.MetaData()
t_challenge = sa.Table('challenge', md, autoload=True, autoload_with=self._engine)
email = jdata.get('email', '')
challenge = jdata.get('challenge', '')
sigdata = jdata.get('sigdata', '')
q = sa.select([t_challenge.c.pubkey]).where(t_challenge.c.email == email, t_challenge.c.challenge == challenge)
rp = conn.execute(q)
qres = rp.fetchall()
if not len(qres):
self.send_error(resp, message='No such challenge for %s' % email)
return
pubkey = qres[0][0]
vk = VerifyKey(pubkey.encode(), encoder=Base64Encoder)
try:
vk.verify(sigdata.encode(), encoder=Base64Encoder)
except BadSignatureError:
self.send_error(resp, message='Could not validate signature for %s' % email)
return
# validated at this point, so record this as valid auth
name = jdata.get('name')
t_auth = sa.Table('auth', md, autoload=True, autoload_with=self._engine)
q = sa.insert(t_auth).values(pubkey=pubkey, name=name, email=email)
conn.execute(q)
q = sa.delete(t_challenge).where(t_challenge.c.email == email, t_challenge.c.challenge == challenge)
conn.execute(q)
self.send_success(resp, message='Challenge verified')
def on_post(self, req, resp):
if not req.content_length:
resp.status = falcon.HTTP_500
resp.content_type = falcon.MEDIA_TEXT
resp.text = 'Payload required\n'
return
raw = req.bounded_stream.read()
try:
jdata = json.loads(raw)
except:
resp.status = falcon.HTTP_500
resp.content_type = falcon.MEDIA_TEXT
resp.text = 'Failed to parse the request\n'
return
logger.info(jdata)
action = jdata.get('action')
if action == 'auth-new':
self.auth_new(jdata, resp)
if action == 'auth-verify':
self.auth_verify(jdata, resp)
else:
resp.status = falcon.HTTP_500
resp.content_type = falcon.MEDIA_TEXT
resp.text = 'Unknown action: %s\n' % action
return
app = falcon.App()
dburl = os.getenv('DB_URL', 'sqlite:///:memory:')
engine = sa.create_engine(dburl)
srl = SendReceiveListener(engine)
mp = os.getenv('MOUNTPOINT', '/_b4_submit')
app.add_route(mp, srl)
if __name__ == '__main__':
from wsgiref.simple_server import make_server
logger.setLevel(logging.DEBUG)
ch = logging.StreamHandler()
formatter = logging.Formatter('%(message)s')
ch.setFormatter(formatter)
ch.setLevel(logging.DEBUG)
logger.addHandler(ch)
with make_server('', 8000, app) as httpd:
logger.info('Serving on port 8000...')
# Serve until process is killed
httpd.serve_forever()
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