import logging import ssl #import platform import time import os import gnutls.crypto #import netifaces #import ping import requests from leap import __branding as BRANDING from leap import certs as leapcerts from leap.base import config as baseconfig from leap.base import constants as baseconstants from leap.base import providers from leap.crypto import certs from leap.eip import config as eipconfig from leap.eip import constants as eipconstants from leap.eip import exceptions as eipexceptions from leap.eip import specs as eipspecs from leap.util.fileutil import mkdir_p logger = logging.getLogger(name=__name__) """ ProviderCertChecker ------------------- Checks on certificates. To be moved to base. docs TBD EIPConfigChecker ---------- It is used from the eip conductor (a instance of EIPConnection that is managed from the QtApp), running `run_all` method before trying to call `connect` or any other of the state-changing methods. It checks that the needed files are provided or can be discovered over the net. Much of these tests are not specific to EIP module, and can be splitted into base.tests to be invoked by the base leap init routines. However, I'm testing them alltogether for the sake of having the whole unit reachable and testable as a whole. """ def get_ca_cert(): ca_file = BRANDING.get('provider_ca_file') if ca_file: return leapcerts.where(ca_file) class ProviderCertChecker(object): """ Several checks needed for getting client certs and checking tls connection with provider. """ def __init__(self, fetcher=requests, domain=None): self.fetcher = fetcher self.domain = domain self.cacert = get_ca_cert() def run_all( self, checker=None, skip_download=False, skip_verify=False): if not checker: checker = self do_verify = not skip_verify logger.debug('do_verify: %s', do_verify) # checker.download_ca_cert() # For MVS+ # checker.download_ca_signature() # checker.get_ca_signatures() # checker.is_there_trust_path() # For MVS checker.is_there_provider_ca() # XXX FAKE IT!!! checker.is_https_working(verify=do_verify) checker.check_new_cert_needed(verify=do_verify) def download_ca_cert(self, uri=None, verify=True): req = self.fetcher.get(uri, verify=verify) req.raise_for_status() # should check domain exists capath = self._get_ca_cert_path(self.domain) with open(capath, 'w') as f: f.write(req.content) def check_ca_cert_fingerprint( self, hash_type="SHA256", fingerprint=None): ca_cert_path = self.ca_cert_path ca_cert_fpr = certs.get_cert_fingerprint( filepath=ca_cert_path) return ca_cert_fpr == fingerprint def verify_api_https(self, uri): assert uri.startswith('https://') cacert = self.ca_cert_path verify = cacert and cacert or True req = self.fetcher.get(uri, verify=verify) req.raise_for_status() return True def download_ca_signature(self): # MVS+ raise NotImplementedError def get_ca_signatures(self): # MVS+ raise NotImplementedError def is_there_trust_path(self): # MVS+ raise NotImplementedError def is_there_provider_ca(self): # XXX modify for generic build from leap import certs logger.debug('do we have provider_ca?') cacert_path = BRANDING.get('provider_ca_file', None) if not cacert_path: # XXX look from the domain logger.debug('False') return False self.cacert = certs.where(cacert_path) logger.debug('True') return True def is_https_working( self, uri=None, verify=True, autocacert=False): if uri is None: uri = self._get_root_uri() # XXX raise InsecureURI or something better try: assert uri.startswith('https') except AssertionError: raise AssertionError( "uri passed should start with https") if autocacert and verify is True and self.cacert is not None: logger.debug('verify cert: %s', self.cacert) verify = self.cacert logger.debug('is https working?') logger.debug('uri: %s (verify:%s)', uri, verify) try: self.fetcher.get(uri, verify=verify) except requests.exceptions.SSLError as exc: logger.error("SSLError") raise eipexceptions.HttpsBadCertError except requests.exceptions.ConnectionError: logger.error('ConnectionError') raise eipexceptions.HttpsNotSupported except requests.exceptions.SSLError as exc: logger.warning('False! CERT VERIFICATION FAILED! ' '(this should be CRITICAL)') logger.warning('SSLError: %s', exc.message) # XXX RAISE! See #638 #raise eipexceptions.EIPBadCertError else: logger.debug('True') return True def check_new_cert_needed(self, skip_download=False, verify=True): logger.debug('is new cert needed?') if not self.is_cert_valid(do_raise=False): logger.debug('True') self.download_new_client_cert( skip_download=skip_download, verify=verify) return True logger.debug('False') return False def download_new_client_cert(self, uri=None, verify=True, skip_download=False): logger.debug('download new client cert') if skip_download: return True if uri is None: uri = self._get_client_cert_uri() # XXX raise InsecureURI or something better assert uri.startswith('https') if verify is True and self.cacert is not None: verify = self.cacert try: # XXX FIXME!!!! # verify=verify # Workaround for #638. return to verification # when That's done!!! # XXX HOOK SRP here... # will have to be more generic in the future. req = self.fetcher.get(uri, verify=False) req.raise_for_status() except requests.exceptions.SSLError: logger.warning('SSLError while fetching cert. ' 'Look below for stack trace.') # XXX raise better exception raise try: pemfile_content = req.content self.is_valid_pemfile(pemfile_content) cert_path = self._get_client_cert_path() self.write_cert(pemfile_content, to=cert_path) except: logger.warning('Error while validating cert') raise return True def is_cert_valid(self, cert_path=None, do_raise=True): exists = lambda: self.is_certificate_exists() valid_pemfile = lambda: self.is_valid_pemfile() not_expired = lambda: self.is_cert_not_expired() valid = exists() and valid_pemfile() and not_expired() if not valid: if do_raise: raise Exception('missing valid cert') else: return False return True def is_certificate_exists(self, certfile=None): if certfile is None: certfile = self._get_client_cert_path() return os.path.isfile(certfile) def is_cert_not_expired(self, certfile=None, now=time.gmtime): if certfile is None: certfile = self._get_client_cert_path() with open(certfile) as cf: cert_s = cf.read() cert = gnutls.crypto.X509Certificate(cert_s) from_ = time.gmtime(cert.activation_time) to_ = time.gmtime(cert.expiration_time) return from_ < now() < to_ def is_valid_pemfile(self, cert_s=None): """ checks that the passed string is a valid pem certificate @param cert_s: string containing pem content @type cert_s: string @rtype: bool """ if cert_s is None: certfile = self._get_client_cert_path() with open(certfile) as cf: cert_s = cf.read() try: # XXX get a real cert validation # so far this is only checking begin/end # delimiters :) # XXX use gnutls for get proper # validation. # crypto.X509Certificate(cert_s) sep = "-" * 5 + "BEGIN CERTIFICATE" + "-" * 5 # we might have private key and cert in the same file certparts = cert_s.split(sep) if len(certparts) > 1: cert_s = sep + certparts[1] ssl.PEM_cert_to_DER_cert(cert_s) except: # XXX raise proper exception raise return True @property def ca_cert_path(self): return self._get_ca_cert_path(self.domain) def _get_root_uri(self): return u"https://%s/" % baseconstants.DEFAULT_PROVIDER def _get_client_cert_uri(self): # XXX get the whole thing from constants return "https://%s/1/cert" % (baseconstants.DEFAULT_PROVIDER) def _get_client_cert_path(self): # MVS+ : get provider path return eipspecs.client_cert_path() def _get_ca_cert_path(self, domain): # XXX this folder path will be broken for win # and this should be moved to eipspecs.ca_path capath = baseconfig.get_config_file( 'cacert.pem', folder='providers/%s/certs/ca' % domain) folder, fname = os.path.split(capath) if not os.path.isdir(folder): mkdir_p(folder) return capath def write_cert(self, pemfile_content, to=None): folder, filename = os.path.split(to) if not os.path.isdir(folder): mkdir_p(folder) with open(to, 'w') as cert_f: cert_f.write(pemfile_content) class EIPConfigChecker(object): """ Several checks needed to ensure a EIPConnection can be sucessfully established. use run_all to run all checks. """ def __init__(self, fetcher=requests): # we do not want to accept too many # argument on init. # we want tests # to be explicitely run. self.fetcher = fetcher self.eipconfig = eipconfig.EIPConfig() self.defaultprovider = providers.LeapProviderDefinition() self.eipserviceconfig = eipconfig.EIPServiceConfig() def run_all(self, checker=None, skip_download=False): """ runs all checks in a row. will raise if some error encountered. catching those exceptions is not our responsibility at this moment """ if not checker: checker = self # let's call all tests # needed for a sane eip session. # TODO: get rid of check_default. # check_complete should # be enough. but here to make early tests easier. checker.check_default_eipconfig() checker.check_is_there_default_provider() checker.fetch_definition(skip_download=skip_download) checker.fetch_eip_service_config(skip_download=skip_download) checker.check_complete_eip_config() #checker.ping_gateway() # public checks def check_default_eipconfig(self): """ checks if default eipconfig exists, and dumps a default file if not """ # XXX ONLY a transient check # because some old function still checks # for eip config at the beginning. # it *really* does not make sense to # dump it right now, we can get an in-memory # config object and dump it to disk in a # later moment logger.debug('checking default eip config') if not self._is_there_default_eipconfig(): self._dump_default_eipconfig() def check_is_there_default_provider(self, config=None): """ raises EIPMissingDefaultProvider if no default provider found on eip config. This is catched by ui and runs FirstRunWizard (MVS+) """ if config is None: config = self.eipconfig.config logger.debug('checking default provider') provider = config.get('provider', None) if provider is None: raise eipexceptions.EIPMissingDefaultProvider # XXX raise also if malformed ProviderDefinition? return True def fetch_definition(self, skip_download=False, config=None, uri=None, domain=None): """ fetches a definition file from server """ # TODO: # - Implement diff # - overwrite only if different. # (attend to serial field different, for instance) logger.debug('fetching definition') if skip_download: logger.debug('(fetching def skipped)') return True if config is None: config = self.defaultprovider.config if uri is None: if not domain: domain = config.get('provider', None) uri = self._get_provider_definition_uri(domain=domain) # FIXME! Pass ca path verify!!! self.defaultprovider.load( from_uri=uri, fetcher=self.fetcher, verify=False) self.defaultprovider.save() def fetch_eip_service_config(self, skip_download=False, config=None, uri=None): if skip_download: return True if config is None: config = self.eipserviceconfig.config if uri is None: domain = config.get('provider', None) uri = self._get_eip_service_uri(domain=domain) self.eipserviceconfig.load(from_uri=uri, fetcher=self.fetcher) self.eipserviceconfig.save() def check_complete_eip_config(self, config=None): # TODO check for gateway if config is None: config = self.eipconfig.config try: 'trying assertions' assert 'provider' in config assert config['provider'] is not None # XXX assert there is gateway !! except AssertionError: raise eipexceptions.EIPConfigurationError # XXX TODO: # We should WRITE eip config if missing or # incomplete at this point #self.eipconfig.save() # # private helpers # def _is_there_default_eipconfig(self): return self.eipconfig.exists() def _dump_default_eipconfig(self): self.eipconfig.save() def _get_provider_definition_uri(self, domain=None, path=None): if domain is None: domain = baseconstants.DEFAULT_PROVIDER if path is None: path = baseconstants.DEFINITION_EXPECTED_PATH uri = u"https://%s/%s" % (domain, path) logger.debug('getting provider definition from %s' % uri) return uri def _get_eip_service_uri(self, domain=None, path=None): if domain is None: domain = baseconstants.DEFAULT_PROVIDER if path is None: path = eipconstants.EIP_SERVICE_EXPECTED_PATH uri = "https://%s/%s" % (domain, path) logger.debug('getting eip service file from %s', uri) return uri