some extra checks for auth lib

pylons_app/lib/auth.py

@@ -1,387 +1,399 b''
 #!/usr/bin/env python
 # encoding: utf-8
 # authentication and permission libraries
 # Copyright (C) 2009-2010 Marcin Kuzminski <[e-mail]>
 
 # 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; version 2
 # of the License or (at your opinion) any later version of the license.
 # 
 # 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, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 # MA  02110-1301, USA.
 """
 Created on April 4, 2010
 
 @author: marcink
 """
 
 from functools import wraps
 from pylons import session, url, request
 from pylons.controllers.util import abort, redirect
 from pylons_app.model import meta
 from pylons_app.model.db import User, Repo2Perm, Repository, Permission
 from pylons_app.lib.utils import get_repo_slug
 from sqlalchemy.exc import OperationalError
 from sqlalchemy.orm.exc import NoResultFound, MultipleResultsFound
 import crypt
 import logging
 from pylons import config
 log = logging.getLogger(__name__) 
 
 def get_crypt_password(password):
     """
     Cryptographic function used for password hashing
     @param password: password to hash
     """
     return crypt.crypt(password, '6a')
 
 def authfunc(environ, username, password):
     sa = meta.Session
     password_crypt = get_crypt_password(password)
     try:
         user = sa.query(User).filter(User.username == username).one()
     except (NoResultFound, MultipleResultsFound, OperationalError) as e:
         log.error(e)
         user = None
         
     if user:
         if user.active:
             if user.username == username and user.password == password_crypt:
                 log.info('user %s authenticated correctly', username)
                 return True
         else:
             log.error('user %s is disabled', username)
             
     return False
 
 class  AuthUser(object):
     """
     A simple object that handles a mercurial username for authentication
     """
     def __init__(self):
         self.username = 'None'
         self.user_id = None
         self.is_authenticated = False
         self.is_admin = False
         self.permissions = {}
 
 
 def set_available_permissions(config):
     """
     This function will propagate pylons globals with all available defined
     permission given in db. We don't wannt to check each time from db for new 
     permissions since adding a new permission also requires application restart
     ie. to decorate new views with the newly created permission
     @param config:
     """
     log.info('getting information about all available permissions')
     sa = meta.Session
     all_perms = sa.query(Permission).all()
     config['available_permissions'] = [x.permission_name for x in all_perms]
 
 def set_base_path(config):
     config['base_path'] = config['pylons.app_globals'].base_path
         
 def fill_perms(user):
     sa = meta.Session
     user.permissions['repositories'] = {}
     
     #first fetch default permissions
     default_perms = sa.query(Repo2Perm, Repository, Permission)\
         .join((Repository, Repo2Perm.repository == Repository.repo_name))\
         .join((Permission, Repo2Perm.permission_id == Permission.permission_id))\
         .filter(Repo2Perm.user_id == sa.query(User).filter(User.username == 
                                             'default').one().user_id).all()
 
     if user.is_admin:
         user.permissions['global'] = set(['hg.admin'])
         #admin have all rights full
         for perm in default_perms:
             p = 'repository.admin'
             user.permissions['repositories'][perm.Repo2Perm.repository] = p
     
     else:
         user.permissions['global'] = set()
         for perm in default_perms:
             if perm.Repository.private:
                 #disable defaults for private repos,
                 p = 'repository.none'
             elif perm.Repository.user_id == user.user_id:
                 #set admin if owner
                 p = 'repository.admin'
             else:
                 p = perm.Permission.permission_name
                 
             user.permissions['repositories'][perm.Repo2Perm.repository] = p
                                                 
         
         user_perms = sa.query(Repo2Perm, Permission, Repository)\
             .join((Repository, Repo2Perm.repository == Repository.repo_name))\
             .join((Permission, Repo2Perm.permission_id == Permission.permission_id))\
             .filter(Repo2Perm.user_id == user.user_id).all()
         #overwrite userpermissions with defaults
         for perm in user_perms:
             #set write if owner
             if perm.Repository.user_id == user.user_id:
                 p = 'repository.write'
             else:
                 p = perm.Permission.permission_name
             user.permissions['repositories'][perm.Repo2Perm.repository] = p            
     return user
     
 def get_user(session):
     """
     Gets user from session, and wraps permissions into user
     @param session:
     """
     user = session.get('hg_app_user', AuthUser())
         
     if user.is_authenticated:
         user = fill_perms(user)
 
     session['hg_app_user'] = user
     session.save()
     return user
         
 #===============================================================================
 # CHECK DECORATORS
 #===============================================================================
 class LoginRequired(object):
     """
     Must be logged in to execute this function else redirect to login page
     """
    
     def __call__(self, func):
         @wraps(func)
         def _wrapper(*fargs, **fkwargs):
             user = session.get('hg_app_user', AuthUser())
             log.debug('Checking login required for user:%s', user.username)
             if user.is_authenticated:
                 log.debug('user %s is authenticated', user.username)
                 func(*fargs)
             else:
                 log.warn('user %s not authenticated', user.username)
                 log.debug('redirecting to login page')
                 return redirect(url('login_home'))
 
         return _wrapper
 
 class PermsDecorator(object):
     """
     Base class for decorators
     """
     
     def __init__(self, *required_perms):
         available_perms = config['available_permissions']
         for perm in required_perms:
             if perm not in available_perms:
                 raise Exception("'%s' permission is not defined" % perm)
         self.required_perms = set(required_perms)
         self.user_perms = None
         
     def __call__(self, func):
         @wraps(func)
         def _wrapper(*fargs, **fkwargs):
             self.user_perms = session.get('hg_app_user', AuthUser()).permissions
             log.debug('checking %s permissions %s for %s',
                self.__class__.__name__, self.required_perms, func.__name__)
             
             if self.check_permissions():
                 log.debug('Permission granted for %s', func.__name__)
                 return func(*fargs)
             
             else:
                 log.warning('Permission denied for %s', func.__name__)
                 #redirect with forbidden ret code
                 return abort(403)
         return _wrapper
         
         
     def check_permissions(self):
         """
         Dummy function for overriding
         """
         raise Exception('You have to write this function in child class')
 
 class HasPermissionAllDecorator(PermsDecorator):
     """
     Checks for access permission for all given predicates. All of them have to
     be meet in order to fulfill the request
     """
         
     def check_permissions(self):
-        if self.required_perms.issubset(self.user_perms['global']):
+        if self.required_perms.issubset(self.user_perms.get('global')):
             return True
         return False
             
 
 class HasPermissionAnyDecorator(PermsDecorator):
     """
     Checks for access permission for any of given predicates. In order to 
     fulfill the request any of predicates must be meet
     """
     
     def check_permissions(self):
-        if self.required_perms.intersection(self.user_perms['global']):
+        if self.required_perms.intersection(self.user_perms.get('global')):
             return True
         return False
 
 class HasRepoPermissionAllDecorator(PermsDecorator):
     """
     Checks for access permission for all given predicates for specific 
     repository. All of them have to be meet in order to fulfill the request
     """
             
     def check_permissions(self):
         repo_name = get_repo_slug(request)
+        try:
         user_perms = set([self.user_perms['repositories'][repo_name]])
+        except KeyError:
+            return False
         if self.required_perms.issubset(user_perms):
             return True
         return False
             
 
 class HasRepoPermissionAnyDecorator(PermsDecorator):
     """
     Checks for access permission for any of given predicates for specific 
     repository. In order to fulfill the request any of predicates must be meet
     """
             
     def check_permissions(self):
         repo_name = get_repo_slug(request)
         
+        try:
         user_perms = set([self.user_perms['repositories'][repo_name]])
+        except KeyError:
+            return False
         if self.required_perms.intersection(user_perms):
             return True
         return False
 #===============================================================================
 # CHECK FUNCTIONS
 #===============================================================================
 
 class PermsFunction(object):
     """
     Base function for other check functions
     """
     
     def __init__(self, *perms):
         available_perms = config['available_permissions']
         
         for perm in perms:
             if perm not in available_perms:
                 raise Exception("'%s' permission in not defined" % perm)
         self.required_perms = set(perms)
         self.user_perms = None
         self.granted_for = ''
         self.repo_name = None
         
     def __call__(self, check_Location=''):
         user = session.get('hg_app_user', False)
         if not user:
             return False
         self.user_perms = user.permissions
         self.granted_for = user.username        
         log.debug('checking %s %s', self.__class__.__name__, self.required_perms)            
         
         if self.check_permissions():
             log.debug('Permission granted for %s @%s', self.granted_for,
                       check_Location)
             return True
         
         else:
             log.warning('Permission denied for %s @%s', self.granted_for,
                         check_Location)
             return False 
     
     def check_permissions(self):
         """
         Dummy function for overriding
         """
         raise Exception('You have to write this function in child class')
         
 class HasPermissionAll(PermsFunction):
     def check_permissions(self):
-        if self.required_perms.issubset(self.user_perms['global']):
+        if self.required_perms.issubset(self.user_perms.get('global')):
             return True
         return False
 
 class HasPermissionAny(PermsFunction):
     def check_permissions(self):
-        if self.required_perms.intersection(self.user_perms['global']):
+        if self.required_perms.intersection(self.user_perms.get('global')):
             return True
         return False
 
 class HasRepoPermissionAll(PermsFunction):
     
     def __call__(self, repo_name=None, check_Location=''):
         self.repo_name = repo_name
         return super(HasRepoPermissionAll, self).__call__(check_Location)
             
     def check_permissions(self):
         if not self.repo_name:
             self.repo_name = get_repo_slug(request)
 
+        try:
         self.user_perms = set([self.user_perms['repositories']\
-                               .get(self.repo_name)])
+                                   [self.repo_name]])
+        except KeyError:
+            return False
         self.granted_for = self.repo_name       
         if self.required_perms.issubset(self.user_perms):
             return True
         return False
             
 class HasRepoPermissionAny(PermsFunction):
     
     
     def __call__(self, repo_name=None, check_Location=''):
         self.repo_name = repo_name
         return super(HasRepoPermissionAny, self).__call__(check_Location)
         
     def check_permissions(self):
         if not self.repo_name:
             self.repo_name = get_repo_slug(request)
 
+        try:
         self.user_perms = set([self.user_perms['repositories']\
-                               .get(self.repo_name)])
+                                   [self.repo_name]])
+        except KeyError:
+            return False
         self.granted_for = self.repo_name
         if self.required_perms.intersection(self.user_perms):
             return True
         return False
 
 #===============================================================================
 # SPECIAL VERSION TO HANDLE MIDDLEWARE AUTH
 #===============================================================================
 
 class HasPermissionAnyMiddleware(object):
     def __init__(self, *perms):
         self.required_perms = set(perms)
     
     def __call__(self, user, repo_name):
         usr = AuthUser()
         usr.user_id = user.user_id
         usr.username = user.username
         usr.is_admin = user.admin
         
         try:
             self.user_perms = set([fill_perms(usr)\
                                    .permissions['repositories'][repo_name]])
         except:
             self.user_perms = set()
         self.granted_for = ''
         self.username = user.username
         self.repo_name = repo_name        
         return self.check_permissions()
             
     def check_permissions(self):
         log.debug('checking mercurial protocol '
                   'permissions for user:%s repository:%s',
                                                 self.username, self.repo_name)
         if self.required_perms.intersection(self.user_perms):
             log.debug('permission granted')
             return True
         log.debug('permission denied')
         return False