path: root/src/leap/services/eip/eipbootstrapper.py

# -*- coding: utf-8 -*-
# eipbootstrapper.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/>.

"""
EIP bootstrapping
"""

import logging
import os

import requests

from PySide import QtGui, QtCore

from leap.common.check import leap_assert, leap_assert_type
from leap.common.certs import is_valid_pemfile, should_redownload
from leap.common.files import check_and_fix_urw_only, get_mtime, mkdir_p
from leap.config.providerconfig import ProviderConfig
from leap.crypto.srpauth import SRPAuth
from leap.services.eip.eipconfig import EIPConfig
from leap.util.checkerthread import CheckerThread
from leap.util.request_helpers import get_content

logger = logging.getLogger(__name__)


class EIPBootstrapper(QtCore.QObject):
    """
    Sets up EIP for a provider a series of checks and emits signals
    after they are passed.
    If a check fails, the subsequent checks are not executed
    """

    PASSED_KEY = "passed"
    ERROR_KEY = "error"

    IDLE_SLEEP_INTERVAL = 100

    # All dicts returned are of the form
    # {"passed": bool, "error": str}
    download_config = QtCore.Signal(dict)
    download_client_certificate = QtCore.Signal(dict)

    def __init__(self):
        QtCore.QObject.__init__(self)

        # **************************************************** #
        # Dependency injection helpers, override this for more
        # granular testing
        self._fetcher = requests
        # **************************************************** #

        self._session = self._fetcher.session()
        self._provider_config = None
        self._eip_config = None
        self._download_if_needed = False

    def _download_config(self):
        """
        Downloads the EIP config for the given provider

        @return: True if the checks passed, False otherwise
        @rtype: bool
        """

        leap_assert(self._provider_config,
                    "We need a provider configuration!")

        logger.debug("Downloading EIP config for %s" %
                     (self._provider_config.get_domain(),))

        download_config_data = {
            self.PASSED_KEY: False,
            self.ERROR_KEY: ""
        }

        self._eip_config = EIPConfig()

        try:
            headers = {}
            mtime = get_mtime(os.path.join(self._eip_config
                                           .get_path_prefix(),
                                           "leap",
                                           "providers",
                                           self._provider_config.get_domain(),
                                           "eip-service.json"))

            if self._download_if_needed and mtime:
                headers['if-modified-since'] = mtime

            res = self._session.get("%s/%s/%s/%s" %
                                    (self._provider_config.get_api_uri(),
                                     self._provider_config.get_api_version(),
                                     "config",
                                     "eip-service.json"),
                                    verify=self._provider_config
                                    .get_ca_cert_path(),
                                    headers=headers)
            res.raise_for_status()

            # Not modified
            if res.status_code == 304:
                logger.debug("EIP definition has not been modified")
            else:
                eip_definition, mtime = get_content(res)

                self._eip_config.load(data=eip_definition, mtime=mtime)
                self._eip_config.save(["leap",
                                       "providers",
                                       self._provider_config.get_domain(),
                                       "eip-service.json"])

            download_config_data[self.PASSED_KEY] = True
        except Exception as e:
            download_config_data[self.ERROR_KEY] = "%s" % (e,)

        logger.debug("Emitting download_config %s" % (download_config_data,))
        self.download_config.emit(download_config_data)

        return download_config_data[self.PASSED_KEY]

    def _download_client_certificates(self):
        """
        Downloads the EIP client certificate for the given provider

        @return: True if the checks passed, False otherwise
        @rtype: bool
        """
        leap_assert(self._provider_config, "We need a provider configuration!")
        leap_assert(self._eip_config, "We need an eip configuration!")

        logger.debug("Downloading EIP client certificate for %s" %
                     (self._provider_config.get_domain(),))

        download_cert = {
            self.PASSED_KEY: False,
            self.ERROR_KEY: ""
        }

        client_cert_path = self._eip_config.\
            get_client_cert_path(self._provider_config,
                                 about_to_download=True)

        # For re-download if something is wrong with the cert
        self._download_if_needed = self._download_if_needed and \
            not should_redownload(client_cert_path)

        if self._download_if_needed and \
                os.path.exists(client_cert_path):
            try:
                check_and_fix_urw_only(client_cert_path)
                download_cert[self.PASSED_KEY] = True
            except Exception as e:
                download_cert[self.PASSED_KEY] = False
                download_cert[self.ERROR_KEY] = "%s" % (e,)
            self.download_client_certificate.emit(download_cert)
            return download_cert[self.PASSED_KEY]

        try:
            srp_auth = SRPAuth(self._provider_config)
            session_id = srp_auth.get_session_id()
            cookies = None
            if session_id:
                cookies = {"_session_id": session_id}
            res = self._session.get("%s/%s/%s/" %
                                    (self._provider_config.get_api_uri(),
                                     self._provider_config.get_api_version(),
                                     "cert"),
                                    verify=self._provider_config
                                    .get_ca_cert_path(),
                                    cookies=cookies)
            res.raise_for_status()

            client_cert = res.content

            # TODO: check certificate validity

            if not is_valid_pemfile(client_cert):
                raise Exception(self.tr("The downloaded certificate is not a "
                                        "valid PEM file"))

            mkdir_p(os.path.dirname(client_cert_path))

            with open(client_cert_path, "w") as f:
                f.write(client_cert)

            check_and_fix_urw_only(client_cert_path)

            download_cert[self.PASSED_KEY] = True
        except Exception as e:
            download_cert[self.ERROR_KEY] = "%s" % (e,)

        logger.debug("Emitting download_client_certificates %s" %
                     (download_cert,))
        self.download_client_certificate.emit(download_cert)

        return download_cert[self.PASSED_KEY]

    def run_eip_setup_checks(self, checker,
                             provider_config,
                             download_if_needed=False):
        """
        Starts the checks needed for a new eip setup

        @param provider_config: Provider configuration
        @type provider_config: ProviderConfig
        """
        leap_assert(provider_config, "We need a provider config!")
        leap_assert_type(provider_config, ProviderConfig)

        self._provider_config = provider_config
        self._download_if_needed = download_if_needed

        checker.add_checks([
            self._download_config,
            self._download_client_certificates
        ])


if __name__ == "__main__":
    import sys
    from functools import partial
    app = QtGui.QApplication(sys.argv)

    import signal

    def sigint_handler(*args, **kwargs):
        logger.debug('SIGINT catched. shutting down...')
        checker = args[0]
        checker.set_should_quit()
        QtGui.QApplication.quit()

    def signal_tester(d):
        print d

    logger = logging.getLogger(name='leap')
    logger.setLevel(logging.DEBUG)
    console = logging.StreamHandler()
    console.setLevel(logging.DEBUG)
    formatter = logging.Formatter(
        '%(asctime)s '
        '- %(name)s - %(levelname)s - %(message)s')
    console.setFormatter(formatter)
    logger.addHandler(console)

    eip_checks = EIPBootstrapper()
    checker = CheckerThread()

    sigint = partial(sigint_handler, checker)
    signal.signal(signal.SIGINT, sigint)

    timer = QtCore.QTimer()
    timer.start(500)
    timer.timeout.connect(lambda: None)
    app.connect(app, QtCore.SIGNAL("aboutToQuit()"),
                checker.set_should_quit)
    w = QtGui.QWidget()
    w.resize(100, 100)
    w.show()

    checker.start()

    provider_config = ProviderConfig()
    if provider_config.load(os.path.join("leap",
                                         "providers",
                                         "bitmask.net",
                                         "provider.json")):
        eip_checks.run_eip_setup_checks(checker, provider_config)

    sys.exit(app.exec_())