summary refs log tree commit diff
path: root/synapse/rest/client/v1/login.py
blob: b2bc7537db67debabbd12cc852757efd019d65ae (plain) (blame)
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
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
#
# Licensed 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.

import logging
import xml.etree.ElementTree as ET

from six.moves import urllib

from twisted.web.client import PartialDownloadError

from synapse.api.errors import Codes, LoginError, SynapseError
from synapse.api.ratelimiting import Ratelimiter
from synapse.http.server import finish_request
from synapse.http.servlet import (
    RestServlet,
    parse_json_object_from_request,
    parse_string,
)
from synapse.http.site import SynapseRequest
from synapse.push.mailer import load_jinja2_templates
from synapse.rest.client.v2_alpha._base import client_patterns
from synapse.rest.well_known import WellKnownBuilder
from synapse.types import UserID, map_username_to_mxid_localpart
from synapse.util.msisdn import phone_number_to_msisdn

logger = logging.getLogger(__name__)


def login_submission_legacy_convert(submission):
    """
    If the input login submission is an old style object
    (ie. with top-level user / medium / address) convert it
    to a typed object.
    """
    if "user" in submission:
        submission["identifier"] = {"type": "m.id.user", "user": submission["user"]}
        del submission["user"]

    if "medium" in submission and "address" in submission:
        submission["identifier"] = {
            "type": "m.id.thirdparty",
            "medium": submission["medium"],
            "address": submission["address"],
        }
        del submission["medium"]
        del submission["address"]


def login_id_thirdparty_from_phone(identifier):
    """
    Convert a phone login identifier type to a generic threepid identifier
    Args:
        identifier(dict): Login identifier dict of type 'm.id.phone'

    Returns: Login identifier dict of type 'm.id.threepid'
    """
    if "country" not in identifier or "number" not in identifier:
        raise SynapseError(400, "Invalid phone-type identifier")

    msisdn = phone_number_to_msisdn(identifier["country"], identifier["number"])

    return {"type": "m.id.thirdparty", "medium": "msisdn", "address": msisdn}


class LoginRestServlet(RestServlet):
    PATTERNS = client_patterns("/login$", v1=True)
    CAS_TYPE = "m.login.cas"
    SSO_TYPE = "m.login.sso"
    TOKEN_TYPE = "m.login.token"
    JWT_TYPE = "m.login.jwt"

    def __init__(self, hs):
        super(LoginRestServlet, self).__init__()
        self.hs = hs
        self.jwt_enabled = hs.config.jwt_enabled
        self.jwt_secret = hs.config.jwt_secret
        self.jwt_algorithm = hs.config.jwt_algorithm
        self.saml2_enabled = hs.config.saml2_enabled
        self.cas_enabled = hs.config.cas_enabled
        self.auth_handler = self.hs.get_auth_handler()
        self.registration_handler = hs.get_registration_handler()
        self.handlers = hs.get_handlers()
        self._clock = hs.get_clock()
        self._well_known_builder = WellKnownBuilder(hs)
        self._address_ratelimiter = Ratelimiter()
        self._account_ratelimiter = Ratelimiter()
        self._failed_attempts_ratelimiter = Ratelimiter()

    def on_GET(self, request):
        flows = []
        if self.jwt_enabled:
            flows.append({"type": LoginRestServlet.JWT_TYPE})
        if self.saml2_enabled:
            flows.append({"type": LoginRestServlet.SSO_TYPE})
            flows.append({"type": LoginRestServlet.TOKEN_TYPE})
        if self.cas_enabled:
            flows.append({"type": LoginRestServlet.SSO_TYPE})

            # we advertise CAS for backwards compat, though MSC1721 renamed it
            # to SSO.
            flows.append({"type": LoginRestServlet.CAS_TYPE})

            # While its valid for us to advertise this login type generally,
            # synapse currently only gives out these tokens as part of the
            # CAS login flow.
            # Generally we don't want to advertise login flows that clients
            # don't know how to implement, since they (currently) will always
            # fall back to the fallback API if they don't understand one of the
            # login flow types returned.
            flows.append({"type": LoginRestServlet.TOKEN_TYPE})

        flows.extend(
            ({"type": t} for t in self.auth_handler.get_supported_login_types())
        )

        return 200, {"flows": flows}

    def on_OPTIONS(self, request):
        return 200, {}

    async def on_POST(self, request):
        self._address_ratelimiter.ratelimit(
            request.getClientIP(),
            time_now_s=self.hs.clock.time(),
            rate_hz=self.hs.config.rc_login_address.per_second,
            burst_count=self.hs.config.rc_login_address.burst_count,
            update=True,
        )

        login_submission = parse_json_object_from_request(request)
        try:
            if self.jwt_enabled and (
                login_submission["type"] == LoginRestServlet.JWT_TYPE
            ):
                result = await self.do_jwt_login(login_submission)
            elif login_submission["type"] == LoginRestServlet.TOKEN_TYPE:
                result = await self.do_token_login(login_submission)
            else:
                result = await self._do_other_login(login_submission)
        except KeyError:
            raise SynapseError(400, "Missing JSON keys.")

        well_known_data = self._well_known_builder.get_well_known()
        if well_known_data:
            result["well_known"] = well_known_data
        return 200, result

    async def _do_other_login(self, login_submission):
        """Handle non-token/saml/jwt logins

        Args:
            login_submission:

        Returns:
            dict: HTTP response
        """
        # Log the request we got, but only certain fields to minimise the chance of
        # logging someone's password (even if they accidentally put it in the wrong
        # field)
        logger.info(
            "Got login request with identifier: %r, medium: %r, address: %r, user: %r",
            login_submission.get("identifier"),
            login_submission.get("medium"),
            login_submission.get("address"),
            login_submission.get("user"),
        )
        login_submission_legacy_convert(login_submission)

        if "identifier" not in login_submission:
            raise SynapseError(400, "Missing param: identifier")

        identifier = login_submission["identifier"]
        if "type" not in identifier:
            raise SynapseError(400, "Login identifier has no type")

        # convert phone type identifiers to generic threepids
        if identifier["type"] == "m.id.phone":
            identifier = login_id_thirdparty_from_phone(identifier)

        # convert threepid identifiers to user IDs
        if identifier["type"] == "m.id.thirdparty":
            address = identifier.get("address")
            medium = identifier.get("medium")

            if medium is None or address is None:
                raise SynapseError(400, "Invalid thirdparty identifier")

            if medium == "email":
                # For emails, transform the address to lowercase.
                # We store all email addreses as lowercase in the DB.
                # (See add_threepid in synapse/handlers/auth.py)
                address = address.lower()

            # We also apply account rate limiting using the 3PID as a key, as
            # otherwise using 3PID bypasses the ratelimiting based on user ID.
            self._failed_attempts_ratelimiter.ratelimit(
                (medium, address),
                time_now_s=self._clock.time(),
                rate_hz=self.hs.config.rc_login_failed_attempts.per_second,
                burst_count=self.hs.config.rc_login_failed_attempts.burst_count,
                update=False,
            )

            # Check for login providers that support 3pid login types
            (
                canonical_user_id,
                callback_3pid,
            ) = await self.auth_handler.check_password_provider_3pid(
                medium, address, login_submission["password"]
            )
            if canonical_user_id:
                # Authentication through password provider and 3pid succeeded

                result = await self._complete_login(
                    canonical_user_id, login_submission, callback_3pid
                )
                return result

            # No password providers were able to handle this 3pid
            # Check local store
            user_id = await self.hs.get_datastore().get_user_id_by_threepid(
                medium, address
            )
            if not user_id:
                logger.warning(
                    "unknown 3pid identifier medium %s, address %r", medium, address
                )
                # We mark that we've failed to log in here, as
                # `check_password_provider_3pid` might have returned `None` due
                # to an incorrect password, rather than the account not
                # existing.
                #
                # If it returned None but the 3PID was bound then we won't hit
                # this code path, which is fine as then the per-user ratelimit
                # will kick in below.
                self._failed_attempts_ratelimiter.can_do_action(
                    (medium, address),
                    time_now_s=self._clock.time(),
                    rate_hz=self.hs.config.rc_login_failed_attempts.per_second,
                    burst_count=self.hs.config.rc_login_failed_attempts.burst_count,
                    update=True,
                )
                raise LoginError(403, "", errcode=Codes.FORBIDDEN)

            identifier = {"type": "m.id.user", "user": user_id}

        # by this point, the identifier should be an m.id.user: if it's anything
        # else, we haven't understood it.
        if identifier["type"] != "m.id.user":
            raise SynapseError(400, "Unknown login identifier type")
        if "user" not in identifier:
            raise SynapseError(400, "User identifier is missing 'user' key")

        if identifier["user"].startswith("@"):
            qualified_user_id = identifier["user"]
        else:
            qualified_user_id = UserID(identifier["user"], self.hs.hostname).to_string()

        # Check if we've hit the failed ratelimit (but don't update it)
        self._failed_attempts_ratelimiter.ratelimit(
            qualified_user_id.lower(),
            time_now_s=self._clock.time(),
            rate_hz=self.hs.config.rc_login_failed_attempts.per_second,
            burst_count=self.hs.config.rc_login_failed_attempts.burst_count,
            update=False,
        )

        try:
            canonical_user_id, callback = await self.auth_handler.validate_login(
                identifier["user"], login_submission
            )
        except LoginError:
            # The user has failed to log in, so we need to update the rate
            # limiter. Using `can_do_action` avoids us raising a ratelimit
            # exception and masking the LoginError. The actual ratelimiting
            # should have happened above.
            self._failed_attempts_ratelimiter.can_do_action(
                qualified_user_id.lower(),
                time_now_s=self._clock.time(),
                rate_hz=self.hs.config.rc_login_failed_attempts.per_second,
                burst_count=self.hs.config.rc_login_failed_attempts.burst_count,
                update=True,
            )
            raise

        result = await self._complete_login(
            canonical_user_id, login_submission, callback
        )
        return result

    async def _complete_login(
        self, user_id, login_submission, callback=None, create_non_existant_users=False
    ):
        """Called when we've successfully authed the user and now need to
        actually login them in (e.g. create devices). This gets called on
        all succesful logins.

        Applies the ratelimiting for succesful login attempts against an
        account.

        Args:
            user_id (str): ID of the user to register.
            login_submission (dict): Dictionary of login information.
            callback (func|None): Callback function to run after registration.
            create_non_existant_users (bool): Whether to create the user if
                they don't exist. Defaults to False.

        Returns:
            result (Dict[str,str]): Dictionary of account information after
                successful registration.
        """

        # Before we actually log them in we check if they've already logged in
        # too often. This happens here rather than before as we don't
        # necessarily know the user before now.
        self._account_ratelimiter.ratelimit(
            user_id.lower(),
            time_now_s=self._clock.time(),
            rate_hz=self.hs.config.rc_login_account.per_second,
            burst_count=self.hs.config.rc_login_account.burst_count,
            update=True,
        )

        if create_non_existant_users:
            user_id = await self.auth_handler.check_user_exists(user_id)
            if not user_id:
                user_id = await self.registration_handler.register_user(
                    localpart=UserID.from_string(user_id).localpart
                )

        device_id = login_submission.get("device_id")
        initial_display_name = login_submission.get("initial_device_display_name")
        device_id, access_token = await self.registration_handler.register_device(
            user_id, device_id, initial_display_name
        )

        result = {
            "user_id": user_id,
            "access_token": access_token,
            "home_server": self.hs.hostname,
            "device_id": device_id,
        }

        if callback is not None:
            await callback(result)

        return result

    async def do_token_login(self, login_submission):
        token = login_submission["token"]
        auth_handler = self.auth_handler
        user_id = await auth_handler.validate_short_term_login_token_and_get_user_id(
            token
        )

        result = await self._complete_login(user_id, login_submission)
        return result

    async def do_jwt_login(self, login_submission):
        token = login_submission.get("token", None)
        if token is None:
            raise LoginError(
                401, "Token field for JWT is missing", errcode=Codes.UNAUTHORIZED
            )

        import jwt
        from jwt.exceptions import InvalidTokenError

        try:
            payload = jwt.decode(
                token, self.jwt_secret, algorithms=[self.jwt_algorithm]
            )
        except jwt.ExpiredSignatureError:
            raise LoginError(401, "JWT expired", errcode=Codes.UNAUTHORIZED)
        except InvalidTokenError:
            raise LoginError(401, "Invalid JWT", errcode=Codes.UNAUTHORIZED)

        user = payload.get("sub", None)
        if user is None:
            raise LoginError(401, "Invalid JWT", errcode=Codes.UNAUTHORIZED)

        user_id = UserID(user, self.hs.hostname).to_string()
        result = await self._complete_login(
            user_id, login_submission, create_non_existant_users=True
        )
        return result


class BaseSSORedirectServlet(RestServlet):
    """Common base class for /login/sso/redirect impls"""

    PATTERNS = client_patterns("/login/(cas|sso)/redirect", v1=True)

    def on_GET(self, request):
        args = request.args
        if b"redirectUrl" not in args:
            return 400, "Redirect URL not specified for SSO auth"
        client_redirect_url = args[b"redirectUrl"][0]
        sso_url = self.get_sso_url(client_redirect_url)
        request.redirect(sso_url)
        finish_request(request)

    def get_sso_url(self, client_redirect_url):
        """Get the URL to redirect to, to perform SSO auth

        Args:
            client_redirect_url (bytes): the URL that we should redirect the
                client to when everything is done

        Returns:
            bytes: URL to redirect to
        """
        # to be implemented by subclasses
        raise NotImplementedError()


class CasRedirectServlet(BaseSSORedirectServlet):
    def __init__(self, hs):
        super(CasRedirectServlet, self).__init__()
        self.cas_server_url = hs.config.cas_server_url.encode("ascii")
        self.cas_service_url = hs.config.cas_service_url.encode("ascii")

    def get_sso_url(self, client_redirect_url):
        client_redirect_url_param = urllib.parse.urlencode(
            {b"redirectUrl": client_redirect_url}
        ).encode("ascii")
        hs_redirect_url = self.cas_service_url + b"/_matrix/client/r0/login/cas/ticket"
        service_param = urllib.parse.urlencode(
            {b"service": b"%s?%s" % (hs_redirect_url, client_redirect_url_param)}
        ).encode("ascii")
        return b"%s/login?%s" % (self.cas_server_url, service_param)


class CasTicketServlet(RestServlet):
    PATTERNS = client_patterns("/login/cas/ticket", v1=True)

    def __init__(self, hs):
        super(CasTicketServlet, self).__init__()
        self.cas_server_url = hs.config.cas_server_url
        self.cas_service_url = hs.config.cas_service_url
        self.cas_displayname_attribute = hs.config.cas_displayname_attribute
        self.cas_required_attributes = hs.config.cas_required_attributes
        self._sso_auth_handler = SSOAuthHandler(hs)
        self._http_client = hs.get_proxied_http_client()

    async def on_GET(self, request):
        client_redirect_url = parse_string(request, "redirectUrl", required=True)
        uri = self.cas_server_url + "/proxyValidate"
        args = {
            "ticket": parse_string(request, "ticket", required=True),
            "service": self.cas_service_url,
        }
        try:
            body = await self._http_client.get_raw(uri, args)
        except PartialDownloadError as pde:
            # Twisted raises this error if the connection is closed,
            # even if that's being used old-http style to signal end-of-data
            body = pde.response
        result = await self.handle_cas_response(request, body, client_redirect_url)
        return result

    def handle_cas_response(self, request, cas_response_body, client_redirect_url):
        user, attributes = self.parse_cas_response(cas_response_body)
        displayname = attributes.pop(self.cas_displayname_attribute, None)

        for required_attribute, required_value in self.cas_required_attributes.items():
            # If required attribute was not in CAS Response - Forbidden
            if required_attribute not in attributes:
                raise LoginError(401, "Unauthorized", errcode=Codes.UNAUTHORIZED)

            # Also need to check value
            if required_value is not None:
                actual_value = attributes[required_attribute]
                # If required attribute value does not match expected - Forbidden
                if required_value != actual_value:
                    raise LoginError(401, "Unauthorized", errcode=Codes.UNAUTHORIZED)

        return self._sso_auth_handler.on_successful_auth(
            user, request, client_redirect_url, displayname
        )

    def parse_cas_response(self, cas_response_body):
        user = None
        attributes = {}
        try:
            root = ET.fromstring(cas_response_body)
            if not root.tag.endswith("serviceResponse"):
                raise Exception("root of CAS response is not serviceResponse")
            success = root[0].tag.endswith("authenticationSuccess")
            for child in root[0]:
                if child.tag.endswith("user"):
                    user = child.text
                if child.tag.endswith("attributes"):
                    for attribute in child:
                        # ElementTree library expands the namespace in
                        # attribute tags to the full URL of the namespace.
                        # We don't care about namespace here and it will always
                        # be encased in curly braces, so we remove them.
                        tag = attribute.tag
                        if "}" in tag:
                            tag = tag.split("}")[1]
                        attributes[tag] = attribute.text
            if user is None:
                raise Exception("CAS response does not contain user")
        except Exception:
            logger.exception("Error parsing CAS response")
            raise LoginError(401, "Invalid CAS response", errcode=Codes.UNAUTHORIZED)
        if not success:
            raise LoginError(
                401, "Unsuccessful CAS response", errcode=Codes.UNAUTHORIZED
            )
        return user, attributes


class SAMLRedirectServlet(BaseSSORedirectServlet):
    PATTERNS = client_patterns("/login/sso/redirect", v1=True)

    def __init__(self, hs):
        self._saml_handler = hs.get_saml_handler()

    def get_sso_url(self, client_redirect_url):
        return self._saml_handler.handle_redirect_request(client_redirect_url)


class SSOAuthHandler(object):
    """
    Utility class for Resources and Servlets which handle the response from a SSO
    service

    Args:
        hs (synapse.server.HomeServer)
    """

    def __init__(self, hs):
        self._hostname = hs.hostname
        self._auth_handler = hs.get_auth_handler()
        self._registration_handler = hs.get_registration_handler()
        self._macaroon_gen = hs.get_macaroon_generator()

        # Load the redirect page HTML template
        self._template = load_jinja2_templates(
            hs.config.sso_redirect_confirm_template_dir, ["sso_redirect_confirm.html"],
        )[0]

        self._server_name = hs.config.server_name

        # cast to tuple for use with str.startswith
        self._whitelisted_sso_clients = tuple(hs.config.sso_client_whitelist)

    async def on_successful_auth(
        self, username, request, client_redirect_url, user_display_name=None
    ):
        """Called once the user has successfully authenticated with the SSO.

        Registers the user if necessary, and then returns a redirect (with
        a login token) to the client.

        Args:
            username (unicode|bytes): the remote user id. We'll map this onto
                something sane for a MXID localpath.

            request (SynapseRequest): the incoming request from the browser. We'll
                respond to it with a redirect.

            client_redirect_url (unicode): the redirect_url the client gave us when
                it first started the process.

            user_display_name (unicode|None): if set, and we have to register a new user,
                we will set their displayname to this.

        Returns:
            Deferred[none]: Completes once we have handled the request.
        """
        localpart = map_username_to_mxid_localpart(username)
        user_id = UserID(localpart, self._hostname).to_string()
        registered_user_id = await self._auth_handler.check_user_exists(user_id)
        if not registered_user_id:
            registered_user_id = await self._registration_handler.register_user(
                localpart=localpart, default_display_name=user_display_name
            )

        self.complete_sso_login(registered_user_id, request, client_redirect_url)

    def complete_sso_login(
        self, registered_user_id: str, request: SynapseRequest, client_redirect_url: str
    ):
        """Having figured out a mxid for this user, complete the HTTP request

        Args:
            registered_user_id:
            request:
            client_redirect_url:
        """
        # Create a login token
        login_token = self._macaroon_gen.generate_short_term_login_token(
            registered_user_id
        )

        # Append the login token to the original redirect URL (i.e. with its query
        # parameters kept intact) to build the URL to which the template needs to
        # redirect the users once they have clicked on the confirmation link.
        redirect_url = self._add_query_param_to_url(
            client_redirect_url, "loginToken", login_token
        )

        # if the client is whitelisted, we can redirect straight to it
        if client_redirect_url.startswith(self._whitelisted_sso_clients):
            request.redirect(redirect_url)
            finish_request(request)
            return

        # Otherwise, serve the redirect confirmation page.

        # Remove the query parameters from the redirect URL to get a shorter version of
        # it. This is only to display a human-readable URL in the template, but not the
        # URL we redirect users to.
        redirect_url_no_params = client_redirect_url.split("?")[0]

        html = self._template.render(
            display_url=redirect_url_no_params,
            redirect_url=redirect_url,
            server_name=self._server_name,
        ).encode("utf-8")

        request.setResponseCode(200)
        request.setHeader(b"Content-Type", b"text/html; charset=utf-8")
        request.setHeader(b"Content-Length", b"%d" % (len(html),))
        request.write(html)
        finish_request(request)

    @staticmethod
    def _add_query_param_to_url(url, param_name, param):
        url_parts = list(urllib.parse.urlparse(url))
        query = dict(urllib.parse.parse_qsl(url_parts[4]))
        query.update({param_name: param})
        url_parts[4] = urllib.parse.urlencode(query)
        return urllib.parse.urlunparse(url_parts)


def register_servlets(hs, http_server):
    LoginRestServlet(hs).register(http_server)
    if hs.config.cas_enabled:
        CasRedirectServlet(hs).register(http_server)
        CasTicketServlet(hs).register(http_server)
    elif hs.config.saml2_enabled:
        SAMLRedirectServlet(hs).register(http_server)