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# Copyright 2021-2024 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library. If not, see <http://www.gnu.org/licenses/>.
import jwt
import uuid
import pam
from secrets import token_hex
from ... session import SessionState
def _check_passwd_pam(username: str, passwd: str) -> bool:
if pam.authenticate(username, passwd):
return True
return False
def init_secret():
state = SessionState()
length = int(state.secret_len)
secret = token_hex(length)
state.secret = secret
def generate_token(user: str, passwd: str, secret: str, exp: int) -> dict:
if user is None or passwd is None:
return {}
state = SessionState()
if _check_passwd_pam(user, passwd):
try:
users = state.token_users
except AttributeError:
users = state.token_users = {}
user_id = uuid.uuid1().hex
payload_data = {'iss': user, 'sub': user_id, 'exp': exp}
secret = getattr(state, 'secret', None)
if secret is None:
return {"errors": ['missing secret']}
token = jwt.encode(payload=payload_data, key=secret, algorithm="HS256")
users |= {user_id: user}
return {'token': token}
else:
return {"errors": ['failed pam authentication']}
def get_user_context(request):
context = {}
context['request'] = request
context['user'] = None
state = SessionState()
if 'Authorization' in request.headers:
auth = request.headers['Authorization']
scheme, token = auth.split()
if scheme.lower() != 'bearer':
return context
try:
secret = getattr(state, 'secret', None)
payload = jwt.decode(token, secret, algorithms=["HS256"])
user_id: str = payload.get('sub')
if user_id is None:
return context
except jwt.exceptions.ExpiredSignatureError:
context['error'] = 'expired token'
return context
except jwt.PyJWTError:
return context
try:
users = state.token_users
except AttributeError:
return context
user = users.get(user_id)
if user is not None:
context['user'] = user
return context
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