-
Notifications
You must be signed in to change notification settings - Fork 14.6k
/
Copy pathkerberos_auth.py
168 lines (135 loc) · 6.01 KB
/
kerberos_auth.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
from __future__ import annotations
import warnings
from airflow.exceptions import RemovedInAirflow3Warning
from airflow.utils.airflow_flask_app import get_airflow_app
#
# Copyright (c) 2013, Michael Komitee
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification,
# are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""Kerberos authentication module"""
import logging
import os
from functools import wraps
from typing import TYPE_CHECKING, Any, Callable, TypeVar, cast
import kerberos
from flask import Response, _request_ctx_stack as stack, g, make_response, request # type: ignore
from requests_kerberos import HTTPKerberosAuth
from airflow.configuration import conf
from airflow.utils.net import getfqdn
if TYPE_CHECKING:
from airflow.auth.managers.models.base_user import BaseUser
log = logging.getLogger(__name__)
CLIENT_AUTH: tuple[str, str] | Any | None = HTTPKerberosAuth(service="airflow")
class KerberosService:
"""Class to keep information about the Kerberos Service initialized."""
def __init__(self):
self.service_name = None
# Stores currently initialized Kerberos Service
_KERBEROS_SERVICE = KerberosService()
def init_app(app):
"""Initialize application with kerberos."""
hostname = app.config.get("SERVER_NAME")
if not hostname:
hostname = getfqdn()
log.info("Kerberos: hostname %s", hostname)
service = "airflow"
_KERBEROS_SERVICE.service_name = f"{service}@{hostname}"
if "KRB5_KTNAME" not in os.environ:
os.environ["KRB5_KTNAME"] = conf.get("kerberos", "keytab")
try:
log.info("Kerberos init: %s %s", service, hostname)
principal = kerberos.getServerPrincipalDetails(service, hostname)
except kerberos.KrbError as err:
log.warning("Kerberos: %s", err)
else:
log.info("Kerberos API: server is %s", principal)
def _unauthorized():
"""Indicate that authorization is required."""
return Response("Unauthorized", 401, {"WWW-Authenticate": "Negotiate"})
def _forbidden():
return Response("Forbidden", 403)
def _gssapi_authenticate(token):
state = None
ctx = stack.top
try:
return_code, state = kerberos.authGSSServerInit(_KERBEROS_SERVICE.service_name)
if return_code != kerberos.AUTH_GSS_COMPLETE:
return None
return_code = kerberos.authGSSServerStep(state, token)
if return_code == kerberos.AUTH_GSS_COMPLETE:
ctx.kerberos_token = kerberos.authGSSServerResponse(state)
ctx.kerberos_user = kerberos.authGSSServerUserName(state)
return return_code
if return_code == kerberos.AUTH_GSS_CONTINUE:
return kerberos.AUTH_GSS_CONTINUE
return None
except kerberos.GSSError:
return None
finally:
if state:
kerberos.authGSSServerClean(state)
T = TypeVar("T", bound=Callable)
def requires_authentication(function: T, find_user: Callable[[str], BaseUser] | None = None):
"""Decorate functions that require authentication with Kerberos."""
if not find_user:
warnings.warn(
"This module is deprecated. Please use "
"`airflow.auth.managers.fab.api.auth.backend.kerberos_auth` instead.",
RemovedInAirflow3Warning,
stacklevel=2,
)
find_user = get_airflow_app().appbuilder.sm.find_user
@wraps(function)
def decorated(*args, **kwargs):
header = request.headers.get("Authorization")
if header:
ctx = stack.top
token = "".join(header.split()[1:])
return_code = _gssapi_authenticate(token)
if return_code == kerberos.AUTH_GSS_COMPLETE:
g.user = find_user(ctx.kerberos_user)
response = function(*args, **kwargs)
response = make_response(response)
if ctx.kerberos_token is not None:
response.headers["WWW-Authenticate"] = f"negotiate {ctx.kerberos_token}"
return response
if return_code != kerberos.AUTH_GSS_CONTINUE:
return _forbidden()
return _unauthorized()
return cast(T, decorated)