summaryrefslogtreecommitdiff
path: root/src/leap/bitmask/bonafide/config.py
blob: 53a2b2a38f6e1b7972c2e4d7ec751d7d7f6993bd (plain)
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
# -*- coding: utf-8 -*-
# config.py
# Copyright (C) 2015 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
"""
Configuration for a LEAP provider.
"""
import binascii
import json
import os
import pkg_resources
import platform
import shutil
import sys

from collections import defaultdict
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes
from cryptography.x509 import load_pem_x509_certificate
from urlparse import urlparse

from twisted.internet import defer
from twisted.logger import Logger
from twisted.web.client import downloadPage

from leap.bitmask.bonafide._http import httpRequest
from leap.bitmask.bonafide.provider import Discovery
from leap.bitmask.bonafide.errors import NotConfiguredError, NetworkError
from leap.bitmask.util import here, STANDALONE

from leap.common.check import leap_assert
from leap.common.config import get_path_prefix as common_get_path_prefix
from leap.common.files import mkdir_p, get_mtime
from leap.common.http import HTTPClient


APPNAME = "bonafide"
if platform.system() == 'Windows':
    ENDPOINT = "tcp://127.0.0.1:5001"
else:
    ENDPOINT = "ipc:///tmp/%s.sock" % APPNAME


def get_path_prefix(standalone=False):
    return common_get_path_prefix(standalone)


_preffix = get_path_prefix()
log = Logger()


def get_provider_path(domain, config='provider.json'):
    """
    Returns relative path for provider configs.

    :param domain: the domain to which this providerconfig belongs to.
    :type domain: str
    :returns: the path
    :rtype: str
    """
    # TODO sanitize domain
    leap_assert(domain is not None, 'get_provider_path: We need a domain')
    return os.path.join('providers', domain, config)


def get_ca_cert_path(basedir, domain):
    leap_assert(domain is not None, 'get_provider_path: We need a domain')

    enc_domain = domain.encode(sys.getfilesystemencoding())
    cert_path = os.path.join(basedir, 'providers', enc_domain, 'keys', 'ca',
                             'cacert.pem')
    if not is_file(cert_path):
        pinned_cert = get_pinned_path(domain, '.pem')
        if is_file(pinned_cert):
            return pinned_cert
    return cert_path


def update_modification_ts(path):
    """
    Sets modification time of a file to current time.

    :param path: the path to set ts to.
    :type path: str
    :returns: modification time
    :rtype: datetime object
    """
    os.utime(path, None)
    return get_mtime(path)


def is_file(path):
    """
    Returns True if the path exists and is a file.
    """
    return os.path.isfile(path)


def is_empty_file(path):
    """
    Returns True if the file at path is empty.
    """
    return os.stat(path).st_size is 0


def make_address(user, provider):
    """
    Return a full identifier for an user, as a email-like
    identifier.

    :param user: the username
    :type user: basestring
    :param provider: the provider domain
    :type provider: basestring
    """
    return '%s@%s' % (user, provider)


def get_username_and_provider(full_id):
    return full_id.split('@')


def list_providers():
    path = os.path.join(_preffix, "leap", "providers")
    path = os.path.expanduser(path)
    if not os.path.isdir(path):
        os.makedirs(path)
    configured = os.listdir(path)

    pinned = os.listdir(get_pinned_path())
    pinned = [provider[:-5] for provider in pinned if provider[-5:] == ".json"]

    return set(configured + pinned)


def delete_provider(domain):
    path = os.path.join(_preffix, "leap", "providers", domain)
    path = os.path.expanduser(path)
    if not os.path.exists(path):
        raise NotConfiguredError("Provider %s is not configured, can't be "
                                 "deleted" % (domain,))
    shutil.rmtree(path)
    Provider.providers[domain] = None


def get_pinned_path(domain=None, extension='.json'):
    if domain is None:
        filename = ''
    else:
        filename = domain.encode(sys.getfilesystemencoding()) + extension

    if STANDALONE:
        # TODO: do the bundling part
        return os.path.join(here(), "..", "apps", "providers", filename)

    return pkg_resources.resource_filename(
        'leap.bitmask.bonafide.providers', filename)


class Provider(object):

    SERVICES_MAP = {
        'openvpn': ['eip'],
        'mx': ['soledad', 'smtp']}

    log = Logger()
    providers = defaultdict(None)

    @classmethod
    def get(self, domain, autoconf=False, basedir=None,
            cert_path=None):
        if domain not in self.providers:
            self.providers[domain] = Provider(domain, autoconf, basedir,
                                              cert_path)
        return self.providers[domain]

    def __init__(self, domain, autoconf=False, basedir=None,
                 cert_path=None):
        if not basedir:
            basedir = os.path.join(_preffix, 'leap')
        self._basedir = os.path.expanduser(basedir)
        self._domain = domain
        self._disco = Discovery('https://%s' % domain)
        self._provider_config = None

        self.first_bootstrap = defer.Deferred()
        self.stuck_bootstrap = None

        is_configured = self.is_configured()
        if not cert_path and is_configured:
            cert_path = self._get_ca_cert_path()
        self._http = HTTPClient(cert_path)

        self._load_provider_json()

        if not is_configured:
            if autoconf:
                self.log.debug(
                    'BOOTSTRAP: provider %s not initialized, '
                    'downloading files...' % domain)
                self.bootstrap()
            else:
                raise NotConfiguredError("Provider %s is not configured"
                                         % (domain,))
        else:
            self.log.debug(
                'BOOTSTRAP: Provider is already initialized, checking if '
                'there are newest config files...')
            self.bootstrap(replace_if_newer=True)

    @property
    def domain(self):
        return self._domain

    @property
    def api_uri(self):
        if not self._provider_config:
            return None
        return self._provider_config.api_uri

    @property
    def version(self):
        if not self._provider_config:
            return 1
        return int(self._provider_config.api_version)

    def is_configured(self):
        provider_json = self._get_provider_json_path()
        pinned_json = get_pinned_path(self._domain)
        if not is_file(provider_json) and not is_file(pinned_json):
            return False

        provider_cert = self._get_ca_cert_path()
        pinned_cert = get_pinned_path(self._domain, '.pem')
        if not is_file(provider_cert) and not is_file(pinned_cert):
            return False
        return True

    def config(self, service=None):
        if not service:
            if not self._provider_config:
                self._load_provider_json()
            return self._provider_config.dict()

        path = self._get_service_config_path(service)
        try:
            with open(path, 'r') as config:
                config = Record(**json.load(config))
        except IOError:
            raise ValueError("Service " + service +
                             " not found in provider " + self._domain)
        return config

    def bootstrap(self, replace_if_newer=False):
        domain = self._domain
        self.log.debug('Bootstrapping provider %s' % domain)

        def first_bootstrap_done(ignored):
            try:
                self.first_bootstrap.callback('got config')
            except defer.AlreadyCalledError:
                pass

        def first_bootstrap_error(failure):
            self.first_bootstrap.errback(failure)
            return failure

        d = self.maybe_download_provider_info(replace=replace_if_newer)
        d.addCallback(self.maybe_download_ca_cert, replace_if_newer)
        d.addCallback(self.validate_ca_cert)
        d.addCallbacks(first_bootstrap_done, first_bootstrap_error)
        d.addCallback(self.maybe_download_services_config)
        self.ongoing_bootstrap = d

    def callWhenMainConfigReady(self, cb, *args, **kw):
        d = self.first_bootstrap
        d.addCallback(lambda _: cb(*args, **kw))
        return d

    def callWhenReady(self, cb, *args, **kw):
        d = self.ongoing_bootstrap
        d.addCallback(lambda _: cb(*args, **kw))
        return d

    def has_valid_certificate(self):
        pass

    def maybe_download_provider_info(self, replace=False):
        """
        Download the provider.json info from the main domain.
        This SHOULD only be used once with the DOMAIN url.
        """
        provider_json = self._get_provider_json_path()

        if is_file(provider_json) and not replace:
            return defer.succeed('provider_info_already_exists')

        folders, f = os.path.split(provider_json)
        mkdir_p(folders)

        uri = self._disco.get_provider_info_uri()
        met = self._disco.get_provider_info_method()

        def errback(failure):
            shutil.rmtree(folders)
            raise NetworkError(failure.getErrorMessage())

        d = httpRequest(
            self._http._agent,
            uri, method=met, saveto=provider_json)
        d.addCallback(lambda _: self._load_provider_json())
        d.addErrback(errback)
        return d

    def update_provider_info(self):
        """
        Get more recent copy of provider.json from the api URL.
        """
        pass

    def maybe_download_ca_cert(self, ignored, replace=False):
        """
        :rtype: deferred
        """
        # TODO: doesn't update the cert :((((
        enc_domain = self._domain.encode(sys.getfilesystemencoding())
        path = os.path.join(self._basedir, 'providers', enc_domain, 'keys',
                            'ca', 'cacert.pem')
        if not replace and is_file(path):
            return defer.succeed('ca_cert_path_already_exists')

        def errback(failure):
            raise NetworkError(failure.getErrorMessage())

        uri = self._get_ca_cert_uri()
        mkdir_p(os.path.split(path)[0])

        # We don't validate the TLS cert for this connection,
        # just check the fingerprint of the ca.cert
        d = downloadPage(uri, path)
        d.addCallback(self._reload_http_client)
        d.addErrback(errback)
        return d

    def _reload_http_client(self, ret):
        self._http = HTTPClient(self._get_ca_cert_path())
        return ret

    def validate_ca_cert(self, ignored):
        expected = self._get_expected_ca_cert_fingerprint()
        algo, expectedfp = expected.split(':')
        expectedfp = expectedfp.replace(' ', '')
        backend = default_backend()

        with open(self._get_ca_cert_path(), 'r') as f:
            certstr = f.read()
        cert = load_pem_x509_certificate(certstr, backend)
        hasher = getattr(hashes, algo)()
        fpbytes = cert.fingerprint(hasher)
        fp = binascii.hexlify(fpbytes)

        if fp != expectedfp:
            os.unlink(self._get_ca_cert_path())
            self.log.error("Fingerprint of CA cert doesn't match: %s <-> %s"
                           % (fp, expectedfp))
            raise NetworkError("The provider's CA fingerprint doesn't match")

    def _get_expected_ca_cert_fingerprint(self):
        try:
            fgp = self._provider_config.ca_cert_fingerprint
        except AttributeError:
            fgp = None
        return fgp

    # Services config files

    def has_fetched_services_config(self):
        return os.path.isfile(self._get_configs_path())

    def maybe_download_services_config(self, ignored):

        # TODO --- currently, some providers (mail.bitmask.net) raise 401
        # UNAUTHENTICATED if we try to get the services
        # See: # https://leap.se/code/issues/7906

        def further_bootstrap_needs_auth(ignored):
            self.log.warn('Cannot download services config yet, need auth')
            pending_deferred = defer.Deferred()
            self.stuck_bootstrap = pending_deferred
            return defer.succeed('ok for now')

        uri, met, path = self._get_configs_download_params()
        d = httpRequest(
            self._http._agent, uri, method=met, saveto=path)
        d.addCallback(lambda _: self._load_provider_json())
        d.addCallback(
            lambda _: self._get_config_for_all_services(session=None))
        d.addErrback(further_bootstrap_needs_auth)
        return d

    def download_services_config_with_auth(self, session):

        def verify_provider_configs(ignored):
            self._load_provider_configs()
            return True

        def complete_bootstrapping(ignored):
            if self.stuck_bootstrap:
                d = self._get_config_for_all_services(session)
                d.addCallback(lambda _:
                              self.stuck_bootstrap.callback('continue!'))
                return d

        self._load_provider_json()
        uri, met, path = self._get_configs_download_params()

        d = session.fetch_provider_configs(uri, path, met)
        d.addCallback(verify_provider_configs)
        d.addCallback(complete_bootstrapping)
        return d

    def _get_configs_download_params(self):
        uri = self._disco.get_configs_uri()
        met = self._disco.get_configs_method()
        path = self._get_configs_path()
        return uri, met, path

    def offers_service(self, service):
        if service not in self.SERVICES_MAP.keys():
            raise RuntimeError('Unknown service: %s' % service)
        return service in self._provider_config.services

    def is_service_enabled(self, service):
        # TODO implement on some config file
        return True

    def has_config_for_service(self, service):
        has_file = os.path.isfile
        path = self._get_service_config_path
        smap = self.SERVICES_MAP

        result = all([has_file(path(subservice)) for
                      subservice in smap[service]])
        return result

    def has_config_for_all_services(self):
        self._load_provider_json()
        if not self._provider_config:
            return False
        all_services = self._provider_config.services
        has_all = all(
            [self.has_config_for_service(service) for service in
             all_services])
        return has_all

    def _get_provider_json_path(self):
        domain = self._domain.encode(sys.getfilesystemencoding())
        provider_json_path = os.path.join(
            self._basedir, get_provider_path(domain, config='provider.json'))
        return provider_json_path

    def _get_configs_path(self):
        domain = self._domain.encode(sys.getfilesystemencoding())
        configs_path = os.path.join(
            self._basedir, get_provider_path(domain, config='configs.json'))
        return configs_path

    def _get_service_config_path(self, service):
        domain = self._domain.encode(sys.getfilesystemencoding())
        configs_path = os.path.join(
            self._basedir, get_provider_path(
                domain, config='%s-service.json' % service))
        return configs_path

    def _get_ca_cert_path(self):
        return get_ca_cert_path(self._basedir, self._domain)

    def _get_ca_cert_uri(self):
        try:
            uri = self._provider_config.ca_cert_uri
            uri = str(uri)
        except Exception:
            uri = None
        return uri

    def _load_provider_json(self):
        path = self._get_provider_json_path()
        if not is_file(path):
            self.log.debug('cannot LOAD provider config path %s' % path)
            path = get_pinned_path(self._domain)
            if not is_file(path):
                return

            self.log.debug('using pinned provider %s' % path)

        with open(path, 'r') as config:
            self._provider_config = Record(**json.load(config))

        api_uri = self._provider_config.api_uri
        if api_uri:
            parsed = urlparse(api_uri)
            self._disco.netloc = parsed.netloc

    def _get_config_for_all_services(self, session):
        services_dict = self._load_provider_configs()
        configs_path = self._get_configs_path()
        with open(configs_path) as jsonf:
            services_dict = Record(**json.load(jsonf)).services
        pending = []
        base = self._disco.get_base_uri()
        for service in self._provider_config.services:
            if service in self.SERVICES_MAP.keys():
                for subservice in self.SERVICES_MAP[service]:
                    uri = base + str(services_dict[subservice])
                    path = self._get_service_config_path(subservice)
                    if session:
                        d = session.fetch_provider_configs(
                            uri, path, method='GET')
                    else:
                        d = self._fetch_provider_configs_unauthenticated(
                            uri, path, method='GET')
                    pending.append(d)
        return defer.gatherResults(pending)

    def _load_provider_configs(self):
        configs_path = self._get_configs_path()
        with open(configs_path) as jsonf:
            services_dict = Record(**json.load(jsonf)).services
        return services_dict

    def _fetch_provider_configs_unauthenticated(self, uri, path):
        self.log.info('Downloading config for %s...' % uri)
        return httpRequest(
            self._http._agent, uri, saveto=path)


class Record(object):
    def __init__(self, **kw):
        self.__dict__.update(kw)

    def dict(self):
        return self.__dict__


if __name__ == '__main__':
    from twisted.internet.task import react

    def main(reactor, *args):
        provider = Provider('cdev.bitmask.net', autoconf=True)
        return provider.callWhenReady(print_done)

    def print_done():
        print '>>> bootstrapping done!!!'

    react(main, [])