summaryrefslogtreecommitdiff
path: root/src/leap/platform_init/initializers.py
blob: 5345f11a4ab42245c5e3084514670e8c7db3bff5 (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
# -*- coding: utf-8 -*-
# initializers.py
# Copyright (C) 2013 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/>.

"""
Platform dependant initializing code
"""

import logging
import os
import platform
import stat
import subprocess
import tempfile

from PySide import QtGui

from leap.config.leapsettings import LeapSettings
from leap.services.eip import vpnlaunchers
from leap.util import first

logger = logging.getLogger(__name__)

# NOTE we could use a deferToThread here, but should
# be aware of this bug: http://www.themacaque.com/?p=1067

__all__ = ["init_platform"]

_system = platform.system()


def init_platform():
    """
    Returns the right initializer for the platform we are running in, or
    None if no proper initializer is found
    """
    initializer = None
    try:
        initializer = globals()[_system + "Initializer"]
    except:
        pass
    if initializer:
        logger.debug("Running initializer for %s" % (platform.system(),))
        initializer()
    else:
        logger.debug("Initializer not found for %s" % (platform.system(),))


#
# common utils
#

NOTFOUND_MSG = ("Tried to install %s, but %s "
                "not found inside this bundle.")
BADEXEC_MSG = ("Tried to install %s, but %s "
               "failed to %s.")

UPDOWN_NOTFOUND_MSG = NOTFOUND_MSG % (
    "updown scripts", "those were")
UPDOWN_BADEXEC_MSG = BADEXEC_MSG % (
    "updown scripts", "they", "be copied")


def get_missing_updown_dialog():
    """
    Creates a dialog for notifying of missing updown scripts.
    Returns that dialog.

    :rtype: QtGui.QMessageBox instance
    """
    WE_NEED_POWERS = ("To better protect your privacy, "
                      "LEAP needs administrative privileges "
                      "to install helper files. "
                      "Do you want to proceed?")
    msg = QtGui.QMessageBox()
    msg.setWindowTitle(msg.tr("Missing up/down scripts"))
    msg.setText(msg.tr(WE_NEED_POWERS))
    # but maybe the user really deserve to know more
    #msg.setInformativeText(msg.tr(BECAUSE))
    msg.setStandardButtons(QtGui.QMessageBox.Yes | QtGui.QMessageBox.No)
    msg.addButton("No, don't ask again", QtGui.QMessageBox.RejectRole)
    msg.setDefaultButton(QtGui.QMessageBox.Yes)
    return msg


def check_missing():
    """
    Checks for the need of installing missing scripts, and
    raises a dialog to ask user for permission to do it.
    """
    config = LeapSettings()
    alert_missing = config.get_alert_missing_scripts()

    launcher = vpnlaunchers.get_platform_launcher()
    missing_scripts = launcher.missing_updown_scripts
    missing_other = launcher.missing_other_files

    if alert_missing and (missing_scripts() or missing_other()):
        msg = get_missing_updown_dialog()
        ret = msg.exec_()

        if ret == QtGui.QMessageBox.Yes:
            install_missing_fun = globals().get(
                "_%s_install_missing_scripts" % (_system.lower(),),
                None)
            if not install_missing_fun:
                logger.warning(
                    "Installer not found for platform %s." % (_system,))
                return
            install_missing_fun(
                # XXX maybe move constants to fun
                UPDOWN_BADEXEC_MSG,
                UPDOWN_NOTFOUND_MSG)

        elif ret == QtGui.QMessageBox.No:
            logger.debug("Not installing missing scripts, "
                         "user decided to ignore our warning.")

        elif ret == QtGui.QMessageBox.Rejected:
            logger.debug(
                "Setting alert_missing_scripts to False, we will not "
                "ask again")
            config.set_alert_missing_scripts(False)
#
# windows initializers
#


def _windows_has_tap_device():
    """
    Loops over the windows registry trying to find if the tap0901 tap driver
    has been installed on this machine.
    """
    import _winreg as reg

    adapter_key = 'SYSTEM\CurrentControlSet\Control\Class' \
        '\{4D36E972-E325-11CE-BFC1-08002BE10318}'
    with reg.OpenKey(reg.HKEY_LOCAL_MACHINE, adapter_key) as adapters:
        try:
            for i in xrange(10000):
                key_name = reg.EnumKey(adapters, i)
                with reg.OpenKey(adapters, key_name) as adapter:
                    try:
                        component_id = reg.QueryValueEx(adapter,
                                                        'ComponentId')[0]
                        if component_id.startswith("tap0901"):
                            return True
                    except WindowsError:
                        pass
        except WindowsError:
            pass
    return False


def WindowsInitializer():
    """
    Raises a dialog in case that the windows tap driver has not been found
    in the registry, asking the user for permission to install the driver
    """
    if not _windows_has_tap_device():
        msg = QtGui.QMessageBox()
        msg.setWindowTitle(msg.tr("TAP Driver"))
        msg.setText(msg.tr("LEAPClient needs to install the necessary drivers "
                           "for Encrypted Internet to work. Would you like to "
                           "proceed?"))
        msg.setInformativeText(msg.tr("Encrypted Internet uses VPN, which "
                                      "needs a TAP device installed and none "
                                      "has been found. This will ask for "
                                      "administrative privileges."))
        msg.setStandardButtons(QtGui.QMessageBox.Yes | QtGui.QMessageBox.No)
        msg.setDefaultButton(QtGui.QMessageBox.Yes)
        ret = msg.exec_()

        if ret == QtGui.QMessageBox.Yes:
            # XXX should do this only if executed inside bundle.
            # Let's assume it's the only way it's gonna be executed under win
            # by now.
            driver_path = os.path.join(os.getcwd(),
                                       "apps",
                                       "eip",
                                       "tap_driver")
            dev_installer = os.path.join(driver_path,
                                         "devcon.exe")
            if os.path.isfile(dev_installer) and \
                    stat.S_IXUSR & os.stat(dev_installer)[stat.ST_MODE] != 0:
                inf_path = os.path.join(driver_path,
                                        "OemWin2k.inf")
                cmd = [dev_installer, "install", inf_path, "tap0901"]
                ret = subprocess.call(cmd, stdout=subprocess.PIPE, shell=True)
            else:
                logger.error("Tried to install TAP driver, but the installer "
                             "is not found or not executable")

#
# Darwin initializer functions
#


def _darwin_has_tun_kext():
    """
    Returns True only if we found a directory under the system kext folder
    containing a kext named tun.kext, AND we found a startup item named 'tun'
    """
    # XXX we should be smarter here and use kextstats output.

    has_kext = os.path.isdir("/System/Library/Extensions/tun.kext")
    has_startup = os.path.isdir("/System/Library/StartupItems/tun")
    has_tun_and_startup = has_kext and has_startup
    logger.debug(
        'platform initializer check: has tun_and_startup = %s' %
        (has_tun_and_startup,))
    return has_tun_and_startup


def _darwin_install_missing_scripts(badexec, notfound):
    """
    Tries to install the missing up/down scripts.

    :param badexec: error for notifying execution error during command.
    :type badexec: str
    :param notfound: error for notifying missing path.
    :type notfound: str
    """
    # We expect to execute this from some way of bundle, since
    # the up/down scripts should be put in place by the installer.
    installer_path = os.path.join(
        os.getcwd(),
        "..",
        "Resources",
        "openvpn")
    launcher = vpnlaunchers.DarwinVPNLauncher

    # TODO should change osascript by use of the proper
    # os authorization api.
    if os.path.isdir(installer_path):
        fd, tempscript = tempfile.mkstemp(prefix="leap_installer-")
        try:
            cmd = launcher.OSASCRIPT_BIN
            scriptlines = launcher.cmd_for_missing_scripts(installer_path)
            with os.fdopen(fd, 'w') as f:
                f.write(scriptlines)
            st = os.stat(tempscript)
            os.chmod(tempscript, st.st_mode | stat.S_IEXEC | stat.S_IXUSR |
                     stat.S_IXGRP | stat.S_IXOTH)

            osascript = launcher.OSX_ASADMIN % ("/bin/sh %s" % (tempscript,),)
            cmdline = ["%s -e '%s'" % (cmd, osascript)]
            ret = subprocess.call(
                cmdline, stdout=subprocess.PIPE,
                shell=True)
            assert([ret])  # happy flakes
        except Exception as exc:
            logger.error(badexec)
            logger.error("Error was: %r" % (exc,))
        finally:
            try:
                os.remove(tempscript)
            except OSError as exc:
                logger.error("%r" % (exc,))
    else:
        logger.error(notfound)
        logger.debug('path searched: %s' % (installer_path,))


def DarwinInitializer():
    """
    Raises a dialog in case that the osx tuntap driver has not been found
    in the registry, asking the user for permission to install the driver
    """
    # XXX split this function into several

    TUNTAP_NOTFOUND_MSG = NOTFOUND_MSG % (
        "tuntaposx kext", "the installer")
    TUNTAP_BADEXEC_MSG = BADEXEC_MSG % (
        "tuntaposx kext", "the installer", "be launched")

    # TODO DRY this with other cases, and
    # factor out to _should_install() function.
    # Leave the dialog as a more generic thing.

    if not _darwin_has_tun_kext():
        msg = QtGui.QMessageBox()
        msg.setWindowTitle(msg.tr("TUN Driver"))
        msg.setText(msg.tr("LEAPClient needs to install the necessary drivers "
                           "for Encrypted Internet to work. Would you like to "
                           "proceed?"))
        msg.setInformativeText(msg.tr("Encrypted Internet uses VPN, which "
                                      "needs a kernel extension for a TUN "
                                      "device installed, and none "
                                      "has been found. This will ask for "
                                      "administrative privileges."))
        msg.setStandardButtons(QtGui.QMessageBox.Yes | QtGui.QMessageBox.No)
        msg.setDefaultButton(QtGui.QMessageBox.Yes)
        ret = msg.exec_()

        if ret == QtGui.QMessageBox.Yes:
            installer_path = os.path.join(
                os.getcwd(),
                "..",
                "Resources",
                "tuntap-installer.app")
            if os.path.isdir(installer_path):
                cmd = ["open %s" % (installer_path,)]
                try:
                    ret = subprocess.call(
                        cmd, stdout=subprocess.PIPE,
                        shell=True)
                except:
                    logger.error(TUNTAP_BADEXEC_MSG)
            else:
                logger.error(TUNTAP_NOTFOUND_MSG)

    # Second check, for missing scripts.
    check_missing()


#
# Linux initializers
#

def _linux_install_missing_scripts(badexec, notfound):
    """
    Tries to install the missing up/down scripts.

    :param badexec: error for notifying execution error during command.
    :type badexec: str
    :param notfound: error for notifying missing path.
    :type notfound: str
    """
    installer_path = os.path.join(
        os.getcwd(),
        "apps", "eip", "files")
    launcher = vpnlaunchers.LinuxVPNLauncher

    # XXX refactor with darwin, same block.

    if os.path.isdir(installer_path):
        fd, tempscript = tempfile.mkstemp(prefix="leap_installer-")
        try:
            pkexec = first(launcher.maybe_pkexec())
            scriptlines = launcher.cmd_for_missing_scripts(installer_path)
            with os.fdopen(fd, 'w') as f:
                f.write(scriptlines)
            st = os.stat(tempscript)
            os.chmod(tempscript, st.st_mode | stat.S_IEXEC | stat.S_IXUSR |
                     stat.S_IXGRP | stat.S_IXOTH)
            cmdline = ["%s %s" % (pkexec, tempscript)]
            ret = subprocess.call(
                cmdline, stdout=subprocess.PIPE,
                shell=True)
            assert([ret])  # happy flakes
        except Exception as exc:
            logger.error(badexec)
            logger.error("Error was: %r" % (exc,))
        finally:
            try:
                os.remove(tempscript)
            except OSError as exc:
                logger.error("%r" % (exc,))
    else:
        logger.error(notfound)
        logger.debug('path searched: %s' % (installer_path,))


def LinuxInitializer():
    """
    Raises a dialog in case that either updown scripts or policykit file
    are missing or they have incorrect permissions.
    """
    check_missing()