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9137135a MT |
1 | #!/usr/bin/python |
2 | ||
4f1cef10 | 3 | import asyncio |
f062b044 | 4 | import base64 |
4f1cef10 | 5 | import functools |
15a45292 | 6 | import http.client |
f062b044 MT |
7 | import json |
8 | import kerberos | |
9 | import logging | |
10 | import os | |
e6e7d284 | 11 | import socket |
9137135a MT |
12 | import time |
13 | import tornado.locale | |
14 | import tornado.web | |
f062b044 | 15 | import tornado.websocket |
f6e6ff79 | 16 | import traceback |
9137135a | 17 | |
14d7ed77 | 18 | from .. import __version__ |
61428bce | 19 | from .. import builders |
2c909128 | 20 | from .. import misc |
f062b044 | 21 | from .. import users |
d2738057 | 22 | from ..decorators import * |
9137135a | 23 | |
f062b044 | 24 | # Setup logging |
6acc7746 | 25 | log = logging.getLogger("pbs.web.base") |
f062b044 MT |
26 | |
27 | class KerberosAuthMixin(object): | |
28 | """ | |
29 | A mixin that handles Kerberos authentication | |
30 | """ | |
31 | @property | |
32 | def kerberos_realm(self): | |
33 | return "IPFIRE.ORG" | |
34 | ||
35 | @property | |
36 | def kerberos_service(self): | |
e6e7d284 MT |
37 | return self.settings.get("krb5-service", "HTTP") |
38 | ||
39 | @property | |
40 | def kerberos_principal(self): | |
41 | return self.settings.get("krb5-principal", "pakfire/%s" % socket.getfqdn()) | |
f062b044 MT |
42 | |
43 | def authenticate_redirect(self): | |
44 | """ | |
45 | Called when the application needs the user to authenticate. | |
46 | ||
47 | We will send a response with status code 401 and set the | |
48 | WWW-Authenticate header to ask the client to either initiate | |
49 | some Kerberos authentication, or to perform HTTP Basic authentication. | |
50 | """ | |
51 | # Ask the client to authenticate using Kerberos | |
52 | self.add_header("WWW-Authenticate", "Negotiate") | |
53 | ||
54 | # Ask the client to authenticate using HTTP Basic Auth | |
55 | self.add_header("WWW-Authenticate", "Basic realm=\"%s\"" % self.kerberos_realm) | |
56 | ||
57 | # Set status to 401 | |
58 | self.set_status(401) | |
59 | ||
4e564583 | 60 | @functools.cache |
f062b044 MT |
61 | def get_authenticated_user(self): |
62 | auth_header = self.request.headers.get("Authorization", None) | |
63 | ||
64 | # No authentication header | |
65 | if not auth_header: | |
66 | return | |
67 | ||
68 | # Perform GSS API Negotiation | |
216a565a | 69 | if auth_header.startswith("Negotiate "): |
f062b044 MT |
70 | return self._auth_negotiate(auth_header) |
71 | ||
72 | # Perform Basic Authentication | |
73 | elif auth_header.startswith("Basic "): | |
74 | return self._auth_basic(auth_header) | |
75 | ||
76 | # Fail on anything else | |
77 | else: | |
78 | raise tornado.web.HTTPError(400, "Unexpected Authentication attempt: %s" % auth_header) | |
79 | ||
80 | def _auth_negotiate(self, auth_header): | |
f062b044 MT |
81 | auth_value = auth_header.removeprefix("Negotiate ") |
82 | ||
e6e7d284 MT |
83 | # Set keytab to use |
84 | os.environ["KRB5_KTNAME"] = self.backend.settings.get("krb5-keytab") | |
85 | ||
f062b044 MT |
86 | try: |
87 | # Initialise the server session | |
88 | result, context = kerberos.authGSSServerInit(self.kerberos_service) | |
89 | ||
90 | if not result == kerberos.AUTH_GSS_COMPLETE: | |
91 | raise tornado.web.HTTPError(500, "Kerberos Initialization failed: %s" % result) | |
92 | ||
93 | # Check the received authentication header | |
94 | result = kerberos.authGSSServerStep(context, auth_value) | |
95 | ||
96 | # If this was not successful, we will fall back to Basic authentication | |
97 | if not result == kerberos.AUTH_GSS_COMPLETE: | |
98 | return self._auth_basic(auth_header) | |
99 | ||
100 | if not isinstance(self, tornado.websocket.WebSocketHandler): | |
101 | # Fetch the server response | |
102 | response = kerberos.authGSSServerResponse(context) | |
103 | ||
104 | # Send the server response | |
105 | self.set_header("WWW-Authenticate", "Negotiate %s" % response) | |
106 | ||
107 | # Return the user who just authenticated | |
108 | user = kerberos.authGSSServerUserName(context) | |
109 | ||
110 | except kerberos.GSSError as e: | |
111 | log.error("Kerberos Authentication Error: %s" % e) | |
112 | ||
113 | raise tornado.web.HTTPError(500, "Could not initialize the Kerberos context") | |
114 | ||
115 | finally: | |
116 | # Cleanup | |
117 | kerberos.authGSSServerClean(context) | |
118 | ||
119 | log.debug("Successfully authenticated %s" % user) | |
120 | ||
121 | return user | |
122 | ||
123 | def _auth_basic(self, auth_header): | |
f062b044 MT |
124 | # Remove "Basic " |
125 | auth_header = auth_header.removeprefix("Basic ") | |
126 | ||
127 | try: | |
128 | # Decode base64 | |
129 | auth_header = base64.b64decode(auth_header).decode() | |
130 | ||
131 | username, password = auth_header.split(":", 1) | |
132 | except: | |
133 | raise tornado.web.HTTPError(400, "Authorization data was malformed") | |
134 | ||
216a565a MT |
135 | # Authenticate against Kerberos |
136 | return self._auth_with_credentials(username, password) | |
137 | ||
138 | def _auth_with_credentials(self, username, password): | |
e6e7d284 MT |
139 | |
140 | # Set keytab to use | |
141 | os.environ["KRB5_KTNAME"] = self.backend.settings.get("krb5-keytab") | |
142 | ||
f062b044 MT |
143 | # Check the credentials against the Kerberos database |
144 | try: | |
145 | kerberos.checkPassword(username, password, | |
e6e7d284 | 146 | self.kerberos_principal, self.kerberos_realm) |
f062b044 MT |
147 | |
148 | # Catch any authentication errors | |
149 | except kerberos.BasicAuthError as e: | |
150 | log.error("Could not authenticate %s: %s" % (username, e)) | |
151 | return | |
152 | ||
153 | # Create user principal name | |
154 | user = "%s@%s" % (username, self.kerberos_realm) | |
155 | ||
156 | log.debug("Successfully authenticated %s" % user) | |
157 | ||
158 | return user | |
159 | ||
160 | ||
9137135a | 161 | class BaseHandler(tornado.web.RequestHandler): |
c6c94528 MT |
162 | @property |
163 | def backend(self): | |
164 | return self.application.backend | |
165 | ||
166 | @property | |
167 | def db(self): | |
168 | return self.backend.db | |
169 | ||
d2738057 MT |
170 | @lazy_property |
171 | def session(self): | |
172 | # Get the session from the cookie | |
173 | session_id = self.get_cookie("session_id", None) | |
f6e6ff79 | 174 | |
d2738057 MT |
175 | # Search for a valid database session |
176 | if session_id: | |
72568c46 | 177 | return self.backend.sessions.get(session_id) |
9137135a | 178 | |
d2738057 MT |
179 | def get_current_user(self): |
180 | if self.session: | |
70987fab | 181 | return self.session.user |
bdeb3c62 | 182 | |
9137135a | 183 | def get_user_locale(self): |
4947da2d MT |
184 | # Get the locale from the user settings |
185 | if self.current_user: | |
186 | return self.current_user.locale | |
9137135a | 187 | |
4947da2d | 188 | # If no locale was provided, we take what ever the browser requested |
214463e3 | 189 | return self.get_browser_locale() |
9137135a | 190 | |
f6e6ff79 | 191 | @property |
12d79e59 | 192 | def current_address(self): |
f6e6ff79 MT |
193 | """ |
194 | Returns the IP address the request came from. | |
195 | """ | |
371a879e | 196 | return self.request.headers.get("X-Real-IP") or self.request.remote_ip |
f6e6ff79 | 197 | |
61c74986 MT |
198 | @property |
199 | def user_agent(self): | |
200 | """ | |
201 | Returns the HTTP user agent | |
202 | """ | |
203 | return self.request.headers.get("User-Agent", None) | |
204 | ||
6468877e MT |
205 | def format_date(self, date, relative=True, shorter=False, full_format=False): |
206 | return self.locale.format_date(date, relative=relative, | |
207 | shorter=shorter, full_format=full_format) | |
f6e6ff79 | 208 | |
8fa68307 MT |
209 | def get_template_namespace(self): |
210 | ns = tornado.web.RequestHandler.get_template_namespace(self) | |
211 | ||
212 | ns.update({ | |
fe9b927c | 213 | "backend" : self.backend, |
f6e6ff79 MT |
214 | "hostname" : self.request.host, |
215 | "format_date" : self.format_date, | |
2c909128 | 216 | "format_size" : misc.format_size, |
14d7ed77 | 217 | "version" : __version__, |
d3307cb1 | 218 | "xsrf_token" : self.xsrf_token, |
f6e6ff79 | 219 | "year" : time.strftime("%Y"), |
8fa68307 | 220 | }) |
9137135a | 221 | |
8fa68307 | 222 | return ns |
9137135a | 223 | |
7ec8e0d3 | 224 | def write_error(self, code, exc_info=None, **kwargs): |
703e79ed | 225 | try: |
7ec8e0d3 | 226 | message = http.client.responses[code] |
703e79ed | 227 | except KeyError: |
7ec8e0d3 MT |
228 | message = None |
229 | ||
230 | _traceback = [] | |
f6e6ff79 MT |
231 | |
232 | # Collect more information about the exception if possible. | |
703e79ed | 233 | if exc_info: |
f062b044 MT |
234 | if self.current_user and isinstance(self.current_user, users.User): |
235 | if self.current_user.is_admin(): | |
236 | _traceback += traceback.format_exception(*exc_info) | |
f6e6ff79 | 237 | |
7ec8e0d3 MT |
238 | self.render("errors/error.html", |
239 | code=code, message=message, traceback="".join(_traceback), **kwargs) | |
1af6c96c MT |
240 | |
241 | # Typed Arguments | |
242 | ||
0bcebf53 MT |
243 | def get_argument_bool(self, name): |
244 | arg = self.get_argument(name, default=None) | |
245 | ||
f791a598 MT |
246 | if arg: |
247 | return arg.lower() in ("on", "true", "yes", "1") | |
248 | ||
249 | return False | |
0bcebf53 | 250 | |
1af6c96c MT |
251 | def get_argument_int(self, *args, **kwargs): |
252 | arg = self.get_argument(*args, **kwargs) | |
253 | ||
0bcebf53 MT |
254 | # Return nothing |
255 | if not arg: | |
256 | return None | |
257 | ||
1af6c96c MT |
258 | try: |
259 | return int(arg) | |
260 | except (TypeError, ValueError): | |
261 | raise tornado.web.HTTPError(400, "%s is not an integer" % arg) | |
98ee6714 | 262 | |
bff2ca64 MT |
263 | def get_argument_builder(self, *args, **kwargs): |
264 | name = self.get_argument(*args, **kwargs) | |
265 | ||
266 | if name: | |
267 | return self.backend.builders.get_by_name(name) | |
268 | ||
98ee6714 MT |
269 | def get_argument_distro(self, *args, **kwargs): |
270 | slug = self.get_argument(*args, **kwargs) | |
271 | ||
272 | if slug: | |
273 | return self.backend.distros.get_by_slug(slug) | |
f004aee7 | 274 | |
5c6b5928 MT |
275 | # Uploads |
276 | ||
277 | def _get_upload(self, uuid): | |
278 | upload = self.backend.uploads.get_by_uuid(uuid) | |
279 | ||
280 | # Check permissions | |
281 | if upload and not upload.has_perm(self.current_user): | |
282 | raise tornado.web.HTTPError(403, "%s has no permissions for upload %s" % (self.current_user, upload)) | |
283 | ||
284 | return upload | |
285 | ||
f062b044 MT |
286 | def get_argument_upload(self, *args, **kwargs): |
287 | """ | |
288 | Returns an upload | |
289 | """ | |
290 | uuid = self.get_argument(*args, **kwargs) | |
291 | ||
292 | if uuid: | |
5c6b5928 | 293 | return self._get_upload(uuid) |
f062b044 MT |
294 | |
295 | def get_argument_uploads(self, *args, **kwargs): | |
296 | """ | |
297 | Returns a list of uploads | |
298 | """ | |
299 | uuids = self.get_arguments(*args, **kwargs) | |
300 | ||
301 | # Return all uploads | |
5c6b5928 | 302 | return [self._get_upload(uuid) for uuid in uuids] |
f062b044 | 303 | |
f004aee7 MT |
304 | def get_argument_user(self, *args, **kwargs): |
305 | name = self.get_argument(*args, **kwargs) | |
306 | ||
307 | if name: | |
308 | return self.backend.users.get_by_name(name) | |
f062b044 MT |
309 | |
310 | # XXX TODO | |
311 | BackendMixin = BaseHandler | |
312 | ||
ce7277af | 313 | class APIError(tornado.web.HTTPError): |
c27e7f37 MT |
314 | """ |
315 | Raised if there has been an error in the API | |
316 | """ | |
317 | def __init__(self, code, message): | |
ce7277af | 318 | super().__init__(400, message) |
c27e7f37 MT |
319 | |
320 | self.code = code | |
321 | self.message = message | |
322 | ||
323 | def __str__(self): | |
324 | return self.message | |
325 | ||
326 | ||
f062b044 MT |
327 | class APIMixin(KerberosAuthMixin, BackendMixin): |
328 | # Generally do not permit users to authenticate against the API | |
329 | allow_users = False | |
330 | ||
331 | # Do not perform any XSRF cookie validation on API calls | |
332 | def check_xsrf_cookie(self): | |
333 | pass | |
334 | ||
335 | def get_current_user(self): | |
336 | """ | |
337 | Authenticates a user or builder | |
338 | """ | |
339 | # Fetch the Kerberos ticket | |
340 | principal = self.get_authenticated_user() | |
341 | ||
342 | # Return nothing if we did not receive any credentials | |
343 | if not principal: | |
344 | return | |
345 | ||
346 | logging.debug("Searching for principal %s..." % principal) | |
347 | ||
348 | # Strip the realm | |
349 | principal, delimiter, realm = principal.partition("@") | |
350 | ||
351 | # Return any builders | |
352 | if principal.startswith("host/"): | |
353 | hostname = principal.removeprefix("host/") | |
354 | ||
355 | return self.backend.builders.get_by_name(hostname) | |
356 | ||
357 | # End here if users are not allowed to authenticate | |
358 | if not self.allow_users: | |
359 | return | |
360 | ||
361 | # Return users | |
362 | return self.backend.users.get_by_name(principal) | |
363 | ||
364 | def get_user_locale(self): | |
365 | return self.get_browser_locale() | |
366 | ||
46a7bd16 MT |
367 | @property |
368 | def builder(self): | |
369 | """ | |
370 | This is a convenience handler to access a builder by a better name | |
371 | """ | |
372 | if isinstance(self.current_user, builders.Builder): | |
373 | return self.current_user | |
374 | ||
375 | raise AttributeError | |
376 | ||
1a1584ce MT |
377 | def get_compression_options(self): |
378 | # Enable maximum compression | |
379 | return { | |
380 | "compression_level" : 9, | |
381 | "mem_level" : 9, | |
382 | } | |
383 | ||
c27e7f37 MT |
384 | def write_error(self, code, exc_info): |
385 | """ | |
386 | Sends a JSON-encoded error message | |
387 | """ | |
388 | type, error, traceback = exc_info | |
389 | ||
390 | # We only handle API errors here | |
391 | if not isinstance(error, APIError): | |
392 | return super().write_error(code, exc_info) | |
393 | ||
394 | # We send errors as 200 | |
395 | self.set_status(200, reason=error.message) | |
396 | ||
f062b044 | 397 | self.finish({ |
c27e7f37 MT |
398 | "error" : { |
399 | "code" : error.code, | |
400 | "message" : error.message, | |
401 | }, | |
f062b044 MT |
402 | }) |
403 | ||
404 | def _decode_json_message(self, message): | |
405 | # Decode JSON message | |
406 | try: | |
407 | message = json.loads(message) | |
408 | ||
409 | except json.DecodeError as e: | |
410 | log.error("Could not decode JSON message", exc_info=True) | |
411 | raise e | |
412 | ||
413 | # Log message | |
414 | log.debug("Received message:") | |
415 | log.debug("%s" % json.dumps(message, indent=4)) | |
416 | ||
417 | return message | |
4f1cef10 MT |
418 | |
419 | ||
8dc73381 MT |
420 | def negotiate(method): |
421 | """ | |
422 | Requires clients to use SPNEGO | |
423 | """ | |
424 | @functools.wraps(method) | |
425 | def wrapper(self, *args, **kwargs): | |
426 | if not self.current_user: | |
427 | # Send the Negotiate header | |
428 | self.add_header("WWW-Authenticate", "Negotiate") | |
429 | ||
430 | # Respond with 401 | |
431 | self.set_status(401) | |
432 | self.finish() | |
433 | ||
434 | return None | |
435 | ||
436 | return method(self, *args, **kwargs) | |
437 | ||
438 | return wrapper | |
439 | ||
4f1cef10 MT |
440 | class ratelimit(object): |
441 | """ | |
442 | A decorator class which limits how often a function can be called | |
443 | """ | |
444 | def __init__(self, *, minutes, requests): | |
445 | self.minutes = minutes | |
446 | self.requests = requests | |
447 | ||
448 | def __call__(self, method): | |
449 | @functools.wraps(method) | |
450 | async def wrapper(handler, *args, **kwargs): | |
451 | # Pass the request to the rate limiter and get a request object | |
452 | req = handler.backend.ratelimiter.handle_request(handler.request, | |
453 | handler, minutes=self.minutes, limit=self.requests) | |
454 | ||
455 | # If the rate limit has been reached, we won't allow | |
456 | # processing the request and therefore send HTTP error code 429. | |
457 | if await req.is_ratelimited(): | |
458 | raise tornado.web.HTTPError(429, "Rate limit exceeded") | |
459 | ||
460 | # Call the wrapped method | |
461 | result = method(handler, *args, **kwargs) | |
462 | ||
463 | # Await it if it is a coroutine | |
464 | if asyncio.iscoroutine(result): | |
465 | return await result | |
466 | ||
467 | # Return the result | |
468 | return result | |
469 | ||
470 | return wrapper |