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| Founder: Christiaan Rademan christiaan.rademan@tachyonic.org | ||
| PTL: Allan Swanepoel allan.swanepoel@tachyonic.org | ||
| PTL: Dave Kruger dave.kruger@tachyonic.org |
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| # -*- coding: utf-8 -*- | ||
| # Copyright (c) 2018 Christiaan Frans Rademan. | ||
| # All rights reserved. | ||
| # | ||
| # Redistribution and use in source and binary forms, with or without | ||
| # modification, are permitted provided that the following conditions are met: | ||
| # | ||
| # * Redistributions of source code must retain the above copyright notice, this | ||
| # list of conditions and the following disclaimer. | ||
| # | ||
| # * Redistributions in binary form must reproduce the above copyright notice, | ||
| # this list of conditions and the following disclaimer in the documentation | ||
| # and/or other materials provided with the distribution. | ||
| # | ||
| # * Neither the name of the copyright holders nor the names of its | ||
| # contributors may be used to endorse or promote products derived from | ||
| # this software without specific prior written permission. | ||
| # | ||
| # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | ||
| # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
| # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
| # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE | ||
| # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | ||
| # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | ||
| # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | ||
| # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | ||
| # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | ||
| # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF | ||
| # THE POSSIBILITY OF SUCH DAMAGE. | ||
| import base64 | ||
| from datetime import timedelta | ||
| from hashlib import md5 | ||
|
|
||
| from luxon import g | ||
| from luxon.utils import js | ||
| from luxon.utils.timezone import now, utc | ||
| from luxon.structs.container import Container | ||
| from luxon.utils import pki | ||
| from luxon.utils.encoding import if_unicode_to_bytes, if_bytes_to_unicode | ||
| from luxon.exceptions import AccessDenied | ||
| from luxon import GetLogger | ||
| from luxon.utils.cast import to_tuple | ||
|
|
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| from infinitystone.utils.auth import context_roles | ||
|
|
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| log = GetLogger(__name__) | ||
|
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|
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| class BaseDriver(object): | ||
| """Base Authentication BaseDriver | ||
| Behaves like a dictionary and provides convienance methods to build | ||
| expected environment structure for API Context. | ||
| During authentication calls, its required to update the Request Object | ||
| context with values stored in authentication environment. To achieve this | ||
| its required that the Authentication driver provides a dictionary object. | ||
| Even though it behaves like one it cannot be used to update another | ||
| dictionary. Therefor its callable and returns a dict object with all | ||
| values. | ||
| Its recomended to use the methods to create the environment. | ||
| Args: | ||
| expire (int): Seconds to expire token. | ||
| """ | ||
| def __init__(self, expire=3600): | ||
| self._token_expire = expire | ||
| self._initial() | ||
|
|
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| def new_token(self, user_id, username, domain=None, tenant_id=None, | ||
| expire=None, roles=[]): | ||
| """Create Token. | ||
| This part of step 1 during the authentication after validation. | ||
| Args: | ||
| user_id (str): User ID | ||
| username (str): Username. | ||
| email (str): User email address. | ||
| token (str): Unique token for specific user. | ||
| tenant_id (str): Current tenant id. | ||
| """ | ||
| token = {} | ||
|
|
||
| if user_id is None: | ||
| raise ValueError('Require user_id for new_token') | ||
| if username is None: | ||
| raise ValueError('Require username for new_token') | ||
|
|
||
| # These are only set during valid login. | ||
| # Unique user id. | ||
| token['user_id'] = user_id | ||
|
|
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| # Unique username. | ||
| token['username'] = username | ||
|
|
||
| # Token creation datetime, format YYYY/MM/DD HH:MM:SS. | ||
| token['creation'] = now() | ||
|
|
||
| # Token expire datetime, format YYYY/MM/DD HH:MM:SS. | ||
| if expire is None: | ||
| expire = (now() + timedelta(seconds=self._token_expire)) | ||
| token['expire'] = expire.strftime("%Y/%m/%d %H:%M:%S") | ||
| else: | ||
| token['expire'] = expire | ||
|
|
||
| # Scope domain. | ||
| token['domain'] = domain | ||
|
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| # Scope tenant. | ||
| token['tenant_id'] = tenant_id | ||
|
|
||
| # Scope roles. | ||
| token['roles'] = list(set(context_roles(user_id, | ||
| domain, | ||
| tenant_id) + roles)) | ||
|
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||
| # Token Signature | ||
| private_key = g.app.app_root.rstrip('/') + '/token.key' | ||
| bytes_token = if_unicode_to_bytes(js.dumps(token)) | ||
| b64_token = base64.b64encode(bytes_token) | ||
| token_sig = if_unicode_to_bytes(pki.sign(private_key, b64_token)) | ||
|
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| self._token = token_sig + b'!!!!' + b64_token | ||
| self._cached_token = None | ||
|
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||
| @property | ||
| def token(self): | ||
| if self._token is not None and self._cached_token is None: | ||
| signature, b64_token = self._token.split(b'!!!!') | ||
| json_token = base64.b64decode(b64_token) | ||
| self._cached_token = js.loads(json_token) | ||
| self._cached_token['token'] = self._token | ||
| return self._cached_token | ||
|
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||
| @property | ||
| def authenticated(self): | ||
| if self._token is not None: | ||
| return True | ||
| else: | ||
| return False | ||
|
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| @property | ||
| def encoded(self): | ||
| return self._token | ||
|
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| def __len__(self): | ||
| if self._token is not None: | ||
| return len(self._token) | ||
| return 0 | ||
|
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| def __str__(self): | ||
| if self.token is None: | ||
| return '{}' | ||
| else: | ||
| return js.dumps(self.token) | ||
|
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| def __repr__(self): | ||
| return self.__str__() | ||
|
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| @property | ||
| def json(self): | ||
| return self.__str__() | ||
|
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| def _initial(self): | ||
| """Default Values. | ||
| """ | ||
| self._token = None | ||
| self._cached_token = None | ||
| self._tenant_id = None | ||
| self._domain = None | ||
|
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| def clear(self): | ||
| """Clear Login Context. | ||
| """ | ||
| self._initial() | ||
|
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| def authenticate(self, username, password, domain=None): | ||
| return False | ||
|
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| def login(self, username, password, domain=None): | ||
| if self.authenticate(username, password, domain): | ||
| return True | ||
| else: | ||
| log.warning('Invalid login credentials for %s' % username) | ||
| raise AccessDenied('Invalid login credentials') | ||
|
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| def _check_token(self, signature, token): | ||
| cert = g.app.app_root.rstrip('/') + '/token.cert' | ||
| try: | ||
| pki.verify(cert, signature, token) | ||
| except ValueError as e: | ||
| log.warning('Invalid Token: %s' % e) | ||
| raise AccessDenied('Invalid Token') | ||
|
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|
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| def parse_token(self, token): | ||
| self._initial() | ||
| token = if_unicode_to_bytes(token) | ||
| signature, decoded_token = token.split(b'!!!!') | ||
| self._check_token(signature, decoded_token) | ||
| decoded = js.loads(base64.b64decode(decoded_token)) | ||
| utc_now = now() | ||
| utc_expire = utc(decoded['expire']) | ||
| if utc_now > utc_expire: | ||
| raise AccessDenied('Token Expired') | ||
| self._token = token | ||
|
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| def scope_token(self, token, domain=None, tenant_id=None): | ||
| self.parse_token(token) | ||
| if 'user_id' in self.token: | ||
| user_id = self.token['user_id'] | ||
| else: | ||
| raise AccessDenied('user_id not in token') | ||
|
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| if 'username' in self.token: | ||
| username = self.token['username'] | ||
| else: | ||
| raise AccessDenied('username not in token') | ||
|
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| if 'roles' in self.token: | ||
| roles = self.token['roles'] | ||
| else: | ||
| raise AccessDenied('roles not in token') | ||
|
|
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| if 'expire' in self.token: | ||
| expire = self.token['expire'] | ||
| else: | ||
| raise AccessDenied('expire not in token') | ||
|
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| if 'domain' in self.token: | ||
| if (self.token['domain'] is not None and | ||
| self.token['domain'] != domain): | ||
| raise AccessDenied('token already scoped in domain') | ||
|
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| if 'tenant_id' in self.token: | ||
| if (self.token['tenant_id'] is not None and | ||
| self.token['tenant_id'] != domain): | ||
| raise AccessDenied('token already scoped in tenant') | ||
|
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| self.new_token(user_id, username, | ||
| domain, tenant_id, | ||
| expire=expire, | ||
| roles=roles) | ||
|
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|
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| def _context_validate(self, context, value): | ||
| if self.authenticated: | ||
| token_context = self.token.get(context) | ||
| if token_context is not None: | ||
| if value is None: | ||
| raise AccessDenied("token not scoped for %s Global" % | ||
| context) | ||
| elif value == token_context: | ||
| setattr(self, '_' + context, value) | ||
| else: | ||
| raise AccessDenied("token not scoped for %s '%s'" % | ||
| (context,value,)) | ||
| else: | ||
| setattr(self, '_' + context, value) | ||
| else: | ||
| raise AccessDenied("not authenticated - access denied to %s '%s'" % | ||
| (context,value,)) | ||
|
|
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| @property | ||
| def user_id(self): | ||
| if self.authenticated: | ||
| return self.token['user_id'] | ||
| return None | ||
|
|
||
| @property | ||
| def username(self): | ||
| if self.authenticated: | ||
| return self.token['username'] | ||
| return None | ||
|
|
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| @property | ||
| def expire(self): | ||
| if self.authenticated: | ||
| return self.token['expire'] | ||
| return None | ||
|
|
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| @property | ||
| def created(self): | ||
| if self.authenticated: | ||
| return self.token['created'] | ||
| return None | ||
|
|
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| @property | ||
| def roles(self): | ||
| if self.authenticated: | ||
| return to_tuple(self.token['roles']) | ||
| return () | ||
|
|
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| @property | ||
| def domain(self): | ||
| if self.authenticated: | ||
| if self._domain is not None: | ||
| return self._domain | ||
| else: | ||
| return self.token['domain'] | ||
| return None | ||
|
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| @domain.setter | ||
| def domain(self, value): | ||
| self._context_validate('domain', value) | ||
|
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| @property | ||
| def tenant_id(self): | ||
| if self.authenticated: | ||
| if self._tenant_id is not None: | ||
| return self._tenant_id | ||
| else: | ||
| return self.token['tenant_id'] | ||
| return None | ||
|
|
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| @tenant_id.setter | ||
| def tenant_id(self, value): | ||
| self._context_validate('tenant_id', value) |
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