auth: return early in LoginRequired on invalid IP

Simplify the code of the LoginRequired decorator by returning early when an
unacceptable condition is met.

Note: the 'return' of redirect_to_login() is not strictly needed since we
should not return from that function (redirection occurs). Adding it,
however, is a security measure in case redirect_to_login does not do what it
should do.

kallithea/lib/auth.py

@@ -1,1326 +1,1315 b''
 # -*- coding: utf-8 -*-
 # 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/>.
 """
 kallithea.lib.auth
 ~~~~~~~~~~~~~~~~~~
 
 authentication and permission libraries
 
 This file was forked by the Kallithea project in July 2014.
 Original author and date, and relevant copyright and licensing information is below:
 :created_on: Apr 4, 2010
 :author: marcink
 :copyright: (c) 2013 RhodeCode GmbH, and others.
 :license: GPLv3, see LICENSE.md for more details.
 """
 from __future__ import with_statement
 import time
 import random
 import logging
 import traceback
 import hashlib
 import itertools
 import collections
 
 from tempfile import _RandomNameSequence
 from decorator import decorator
 
 from pylons import url, request
 from pylons.controllers.util import abort, redirect
 from pylons.i18n.translation import _
 from webhelpers.pylonslib import secure_form
 from sqlalchemy import or_
 from sqlalchemy.orm.exc import ObjectDeletedError
 from sqlalchemy.orm import joinedload
 
 from kallithea import __platform__, is_windows, is_unix
 from kallithea.lib.vcs.utils.lazy import LazyProperty
 from kallithea.model import meta
 from kallithea.model.meta import Session
 from kallithea.model.user import UserModel
 from kallithea.model.db import User, Repository, Permission, \
     UserToPerm, UserGroupRepoToPerm, UserGroupToPerm, UserGroupMember, \
     RepoGroup, UserGroupRepoGroupToPerm, UserIpMap, UserGroupUserGroupToPerm, \
     UserGroup, UserApiKeys
 
 from kallithea.lib.utils2 import safe_unicode, aslist
 from kallithea.lib.utils import get_repo_slug, get_repo_group_slug, \
     get_user_group_slug, conditional_cache
 from kallithea.lib.caching_query import FromCache
 
 
 log = logging.getLogger(__name__)
 
 
 class PasswordGenerator(object):
     """
     This is a simple class for generating password from different sets of
     characters
     usage::
 
         passwd_gen = PasswordGenerator()
         #print 8-letter password containing only big and small letters
             of alphabet
         passwd_gen.gen_password(8, passwd_gen.ALPHABETS_BIG_SMALL)
     """
     ALPHABETS_NUM = r'''1234567890'''
     ALPHABETS_SMALL = r'''qwertyuiopasdfghjklzxcvbnm'''
     ALPHABETS_BIG = r'''QWERTYUIOPASDFGHJKLZXCVBNM'''
     ALPHABETS_SPECIAL = r'''`-=[]\;',./~!@#$%^&*()_+{}|:"<>?'''
     ALPHABETS_FULL = ALPHABETS_BIG + ALPHABETS_SMALL \
         + ALPHABETS_NUM + ALPHABETS_SPECIAL
     ALPHABETS_ALPHANUM = ALPHABETS_BIG + ALPHABETS_SMALL + ALPHABETS_NUM
     ALPHABETS_BIG_SMALL = ALPHABETS_BIG + ALPHABETS_SMALL
     ALPHABETS_ALPHANUM_BIG = ALPHABETS_BIG + ALPHABETS_NUM
     ALPHABETS_ALPHANUM_SMALL = ALPHABETS_SMALL + ALPHABETS_NUM
 
     def __init__(self, passwd=''):
         self.passwd = passwd
 
     def gen_password(self, length, type_=None):
         if type_ is None:
             type_ = self.ALPHABETS_FULL
         self.passwd = ''.join([random.choice(type_) for _ in xrange(length)])
         return self.passwd
 
 
 class KallitheaCrypto(object):
 
     @classmethod
     def hash_string(cls, str_):
         """
         Cryptographic function used for password hashing based on pybcrypt
         or pycrypto in windows
 
         :param password: password to hash
         """
         if is_windows:
             from hashlib import sha256
             return sha256(str_).hexdigest()
         elif is_unix:
             import bcrypt
             return bcrypt.hashpw(str_, bcrypt.gensalt(10))
         else:
             raise Exception('Unknown or unsupported platform %s' \
                             % __platform__)
 
     @classmethod
     def hash_check(cls, password, hashed):
         """
         Checks matching password with it's hashed value, runs different
         implementation based on platform it runs on
 
         :param password: password
         :param hashed: password in hashed form
         """
 
         if is_windows:
             from hashlib import sha256
             return sha256(password).hexdigest() == hashed
         elif is_unix:
             import bcrypt
             return bcrypt.hashpw(password, hashed) == hashed
         else:
             raise Exception('Unknown or unsupported platform %s' \
                             % __platform__)
 
 
 def get_crypt_password(password):
     return KallitheaCrypto.hash_string(password)
 
 
 def check_password(password, hashed):
     return KallitheaCrypto.hash_check(password, hashed)
 
 
 def generate_api_key(str_, salt=None):
     """
     Generates API KEY from given string
 
     :param str_:
     :param salt:
     """
 
     if salt is None:
         salt = _RandomNameSequence().next()
 
     return hashlib.sha1(str_ + salt).hexdigest()
 
 
 class CookieStoreWrapper(object):
 
     def __init__(self, cookie_store):
         self.cookie_store = cookie_store
 
     def __repr__(self):
         return 'CookieStore<%s>' % (self.cookie_store)
 
     def get(self, key, other=None):
         if isinstance(self.cookie_store, dict):
             return self.cookie_store.get(key, other)
         elif isinstance(self.cookie_store, AuthUser):
             return self.cookie_store.__dict__.get(key, other)
 
 
 
 def _cached_perms_data(user_id, user_is_admin, user_inherit_default_permissions,
                        explicit, algo):
     RK = 'repositories'
     GK = 'repositories_groups'
     UK = 'user_groups'
     GLOBAL = 'global'
     PERM_WEIGHTS = Permission.PERM_WEIGHTS
     permissions = {RK: {}, GK: {}, UK: {}, GLOBAL: set()}
 
     def _choose_perm(new_perm, cur_perm):
         new_perm_val = PERM_WEIGHTS[new_perm]
         cur_perm_val = PERM_WEIGHTS[cur_perm]
         if algo == 'higherwin':
             if new_perm_val > cur_perm_val:
                 return new_perm
             return cur_perm
         elif algo == 'lowerwin':
             if new_perm_val < cur_perm_val:
                 return new_perm
             return cur_perm
 
     #======================================================================
     # fetch default permissions
     #======================================================================
     default_user = User.get_by_username('default', cache=True)
     default_user_id = default_user.user_id
 
     default_repo_perms = Permission.get_default_perms(default_user_id)
     default_repo_groups_perms = Permission.get_default_group_perms(default_user_id)
     default_user_group_perms = Permission.get_default_user_group_perms(default_user_id)
 
     if user_is_admin:
         #==================================================================
         # admin user have all default rights for repositories
         # and groups set to admin
         #==================================================================
         permissions[GLOBAL].add('hg.admin')
         permissions[GLOBAL].add('hg.create.write_on_repogroup.true')
 
         # repositories
         for perm in default_repo_perms:
             r_k = perm.UserRepoToPerm.repository.repo_name
             p = 'repository.admin'
             permissions[RK][r_k] = p
 
         # repository groups
         for perm in default_repo_groups_perms:
             rg_k = perm.UserRepoGroupToPerm.group.group_name
             p = 'group.admin'
             permissions[GK][rg_k] = p
 
         # user groups
         for perm in default_user_group_perms:
             u_k = perm.UserUserGroupToPerm.user_group.users_group_name
             p = 'usergroup.admin'
             permissions[UK][u_k] = p
         return permissions
 
     #==================================================================
     # SET DEFAULTS GLOBAL, REPOS, REPOSITORY GROUPS
     #==================================================================
     uid = user_id
 
     # default global permissions taken from the default user
     default_global_perms = UserToPerm.query()\
         .filter(UserToPerm.user_id == default_user_id)\
         .options(joinedload(UserToPerm.permission))
 
     for perm in default_global_perms:
         permissions[GLOBAL].add(perm.permission.permission_name)
 
     # defaults for repositories, taken from default user
     for perm in default_repo_perms:
         r_k = perm.UserRepoToPerm.repository.repo_name
         if perm.Repository.private and not (perm.Repository.user_id == uid):
             # disable defaults for private repos,
             p = 'repository.none'
         elif perm.Repository.user_id == uid:
             # set admin if owner
             p = 'repository.admin'
         else:
             p = perm.Permission.permission_name
 
         permissions[RK][r_k] = p
 
     # defaults for repository groups taken from default user permission
     # on given group
     for perm in default_repo_groups_perms:
         rg_k = perm.UserRepoGroupToPerm.group.group_name
         p = perm.Permission.permission_name
         permissions[GK][rg_k] = p
 
     # defaults for user groups taken from default user permission
     # on given user group
     for perm in default_user_group_perms:
         u_k = perm.UserUserGroupToPerm.user_group.users_group_name
         p = perm.Permission.permission_name
         permissions[UK][u_k] = p
 
     #======================================================================
     # !! OVERRIDE GLOBALS !! with user permissions if any found
     #======================================================================
     # those can be configured from groups or users explicitly
     _configurable = set([
         'hg.fork.none', 'hg.fork.repository',
         'hg.create.none', 'hg.create.repository',
         'hg.usergroup.create.false', 'hg.usergroup.create.true'
     ])
 
     # USER GROUPS comes first
     # user group global permissions
     user_perms_from_users_groups = Session().query(UserGroupToPerm)\
         .options(joinedload(UserGroupToPerm.permission))\
         .join((UserGroupMember, UserGroupToPerm.users_group_id ==
                UserGroupMember.users_group_id))\
         .filter(UserGroupMember.user_id == uid)\
         .order_by(UserGroupToPerm.users_group_id)\
         .all()
     # need to group here by groups since user can be in more than
     # one group
     _grouped = [[x, list(y)] for x, y in
                 itertools.groupby(user_perms_from_users_groups,
                                   lambda x:x.users_group)]
     for gr, perms in _grouped:
         # since user can be in multiple groups iterate over them and
         # select the lowest permissions first (more explicit)
         ##TODO: do this^^
         if not gr.inherit_default_permissions:
             # NEED TO IGNORE all configurable permissions and
             # replace them with explicitly set
             permissions[GLOBAL] = permissions[GLOBAL]\
                                             .difference(_configurable)
         for perm in perms:
             permissions[GLOBAL].add(perm.permission.permission_name)
 
     # user specific global permissions
     user_perms = Session().query(UserToPerm)\
             .options(joinedload(UserToPerm.permission))\
             .filter(UserToPerm.user_id == uid).all()
 
     if not user_inherit_default_permissions:
         # NEED TO IGNORE all configurable permissions and
         # replace them with explicitly set
         permissions[GLOBAL] = permissions[GLOBAL]\
                                         .difference(_configurable)
 
         for perm in user_perms:
             permissions[GLOBAL].add(perm.permission.permission_name)
     ## END GLOBAL PERMISSIONS
 
     #======================================================================
     # !! PERMISSIONS FOR REPOSITORIES !!
     #======================================================================
     #======================================================================
     # check if user is part of user groups for this repository and
     # fill in his permission from it. _choose_perm decides of which
     # permission should be selected based on selected method
     #======================================================================
 
     # user group for repositories permissions
     user_repo_perms_from_users_groups = \
      Session().query(UserGroupRepoToPerm, Permission, Repository,)\
         .join((Repository, UserGroupRepoToPerm.repository_id ==
                Repository.repo_id))\
         .join((Permission, UserGroupRepoToPerm.permission_id ==
                Permission.permission_id))\
         .join((UserGroupMember, UserGroupRepoToPerm.users_group_id ==
                UserGroupMember.users_group_id))\
         .filter(UserGroupMember.user_id == uid)\
         .all()
 
     multiple_counter = collections.defaultdict(int)
     for perm in user_repo_perms_from_users_groups:
         r_k = perm.UserGroupRepoToPerm.repository.repo_name
         multiple_counter[r_k] += 1
         p = perm.Permission.permission_name
         cur_perm = permissions[RK][r_k]
 
         if perm.Repository.user_id == uid:
             # set admin if owner
             p = 'repository.admin'
         else:
             if multiple_counter[r_k] > 1:
                 p = _choose_perm(p, cur_perm)
         permissions[RK][r_k] = p
 
     # user explicit permissions for repositories, overrides any specified
     # by the group permission
     user_repo_perms = Permission.get_default_perms(uid)
     for perm in user_repo_perms:
         r_k = perm.UserRepoToPerm.repository.repo_name
         cur_perm = permissions[RK][r_k]
         # set admin if owner
         if perm.Repository.user_id == uid:
             p = 'repository.admin'
         else:
             p = perm.Permission.permission_name
             if not explicit:
                 p = _choose_perm(p, cur_perm)
         permissions[RK][r_k] = p
 
     #======================================================================
     # !! PERMISSIONS FOR REPOSITORY GROUPS !!
     #======================================================================
     #======================================================================
     # check if user is part of user groups for this repository groups and
     # fill in his permission from it. _choose_perm decides of which
     # permission should be selected based on selected method
     #======================================================================
     # user group for repo groups permissions
     user_repo_group_perms_from_users_groups = \
      Session().query(UserGroupRepoGroupToPerm, Permission, RepoGroup)\
      .join((RepoGroup, UserGroupRepoGroupToPerm.group_id == RepoGroup.group_id))\
      .join((Permission, UserGroupRepoGroupToPerm.permission_id
             == Permission.permission_id))\
      .join((UserGroupMember, UserGroupRepoGroupToPerm.users_group_id
             == UserGroupMember.users_group_id))\
      .filter(UserGroupMember.user_id == uid)\
      .all()
 
     multiple_counter = collections.defaultdict(int)
     for perm in user_repo_group_perms_from_users_groups:
         g_k = perm.UserGroupRepoGroupToPerm.group.group_name
         multiple_counter[g_k] += 1
         p = perm.Permission.permission_name
         cur_perm = permissions[GK][g_k]
         if multiple_counter[g_k] > 1:
             p = _choose_perm(p, cur_perm)
         permissions[GK][g_k] = p
 
     # user explicit permissions for repository groups
     user_repo_groups_perms = Permission.get_default_group_perms(uid)
     for perm in user_repo_groups_perms:
         rg_k = perm.UserRepoGroupToPerm.group.group_name
         p = perm.Permission.permission_name
         cur_perm = permissions[GK][rg_k]
         if not explicit:
             p = _choose_perm(p, cur_perm)
         permissions[GK][rg_k] = p
 
     #======================================================================
     # !! PERMISSIONS FOR USER GROUPS !!
     #======================================================================
     # user group for user group permissions
     user_group_user_groups_perms = \
      Session().query(UserGroupUserGroupToPerm, Permission, UserGroup)\
      .join((UserGroup, UserGroupUserGroupToPerm.target_user_group_id
             == UserGroup.users_group_id))\
      .join((Permission, UserGroupUserGroupToPerm.permission_id
             == Permission.permission_id))\
      .join((UserGroupMember, UserGroupUserGroupToPerm.user_group_id
             == UserGroupMember.users_group_id))\
      .filter(UserGroupMember.user_id == uid)\
      .all()
 
     multiple_counter = collections.defaultdict(int)
     for perm in user_group_user_groups_perms:
         g_k = perm.UserGroupUserGroupToPerm.target_user_group.users_group_name
         multiple_counter[g_k] += 1
         p = perm.Permission.permission_name
         cur_perm = permissions[UK][g_k]
         if multiple_counter[g_k] > 1:
             p = _choose_perm(p, cur_perm)
         permissions[UK][g_k] = p
 
     #user explicit permission for user groups
     user_user_groups_perms = Permission.get_default_user_group_perms(uid)
     for perm in user_user_groups_perms:
         u_k = perm.UserUserGroupToPerm.user_group.users_group_name
         p = perm.Permission.permission_name
         cur_perm = permissions[UK][u_k]
         if not explicit:
             p = _choose_perm(p, cur_perm)
         permissions[UK][u_k] = p
 
     return permissions
 
 
 def allowed_api_access(controller_name, whitelist=None, api_key=None):
     """
     Check if given controller_name is in whitelist API access
     """
     if not whitelist:
         from kallithea import CONFIG
         whitelist = aslist(CONFIG.get('api_access_controllers_whitelist'),
                            sep=',')
         log.debug('whitelist of API access is: %s' % (whitelist))
     api_access_valid = controller_name in whitelist
     if api_access_valid:
         log.debug('controller:%s is in API whitelist' % (controller_name))
     else:
         msg = 'controller: %s is *NOT* in API whitelist' % (controller_name)
         if api_key:
             #if we use API key and don't have access it's a warning
             log.warning(msg)
         else:
             log.debug(msg)
     return api_access_valid
 
 
 class AuthUser(object):
     """
     A simple object that handles all attributes of user in Kallithea
 
     It does lookup based on API key,given user, or user present in session
     Then it fills all required information for such user. It also checks if
     anonymous access is enabled and if so, it returns default user as logged in
     """
 
     def __init__(self, user_id=None, api_key=None, username=None, ip_addr=None):
 
         self.user_id = user_id
         self._api_key = api_key
 
         self.api_key = None
         self.username = username
         self.ip_addr = ip_addr
         self.name = ''
         self.lastname = ''
         self.email = ''
         self.is_authenticated = False
         self.admin = False
         self.inherit_default_permissions = False
 
         self.propagate_data()
         self._instance = None
 
     @LazyProperty
     def permissions(self):
         return self.get_perms(user=self, cache=False)
 
     @property
     def api_keys(self):
         return self.get_api_keys()
 
     def propagate_data(self):
         user_model = UserModel()
         self.anonymous_user = User.get_default_user(cache=True)
         is_user_loaded = False
 
         # lookup by userid
         if self.user_id is not None and self.user_id != self.anonymous_user.user_id:
             log.debug('Auth User lookup by USER ID %s' % self.user_id)
             is_user_loaded = user_model.fill_data(self, user_id=self.user_id)
 
         # try go get user by api key
         elif self._api_key and self._api_key != self.anonymous_user.api_key:
             log.debug('Auth User lookup by API KEY %s' % self._api_key)
             is_user_loaded = user_model.fill_data(self, api_key=self._api_key)
 
         # lookup by username
         elif self.username:
             log.debug('Auth User lookup by USER NAME %s' % self.username)
             is_user_loaded = user_model.fill_data(self, username=self.username)
         else:
             log.debug('No data in %s that could been used to log in' % self)
 
         if not is_user_loaded:
             # if we cannot authenticate user try anonymous
             if self.anonymous_user.active:
                 user_model.fill_data(self, user_id=self.anonymous_user.user_id)
                 # then we set this user is logged in
                 self.is_authenticated = True
             else:
                 self.user_id = None
                 self.username = None
                 self.is_authenticated = False
 
         if not self.username:
             self.username = 'None'
 
         log.debug('Auth User is now %s' % self)
 
     def get_perms(self, user, explicit=True, algo='higherwin', cache=False):
         """
         Fills user permission attribute with permissions taken from database
         works for permissions given for repositories, and for permissions that
         are granted to groups
 
         :param user: instance of User object from database
         :param explicit: In case there are permissions both for user and a group
             that user is part of, explicit flag will define if user will
             explicitly override permissions from group, if it's False it will
             make decision based on the algo
         :param algo: algorithm to decide what permission should be choose if
             it's multiple defined, eg user in two different groups. It also
             decides if explicit flag is turned off how to specify the permission
             for case when user is in a group + have defined separate permission
         """
         user_id = user.user_id
         user_is_admin = user.is_admin
         user_inherit_default_permissions = user.inherit_default_permissions
 
         log.debug('Getting PERMISSION tree')
         compute = conditional_cache('short_term', 'cache_desc',
                                     condition=cache, func=_cached_perms_data)
         return compute(user_id, user_is_admin,
                        user_inherit_default_permissions, explicit, algo)
 
     def get_api_keys(self):
         api_keys = [self.api_key]
         for api_key in UserApiKeys.query()\
                 .filter(UserApiKeys.user_id == self.user_id)\
                 .filter(or_(UserApiKeys.expires == -1,
                             UserApiKeys.expires >= time.time())).all():
             api_keys.append(api_key.api_key)
 
         return api_keys
 
     @property
     def is_admin(self):
         return self.admin
 
     @property
     def repositories_admin(self):
         """
         Returns list of repositories you're an admin of
         """
         return [x[0] for x in self.permissions['repositories'].iteritems()
                 if x[1] == 'repository.admin']
 
     @property
     def repository_groups_admin(self):
         """
         Returns list of repository groups you're an admin of
         """
         return [x[0] for x in self.permissions['repositories_groups'].iteritems()
                 if x[1] == 'group.admin']
 
     @property
     def user_groups_admin(self):
         """
         Returns list of user groups you're an admin of
         """
         return [x[0] for x in self.permissions['user_groups'].iteritems()
                 if x[1] == 'usergroup.admin']
 
     @property
     def ip_allowed(self):
         """
         Checks if ip_addr used in constructor is allowed from defined list of
         allowed ip_addresses for user
 
         :returns: boolean, True if ip is in allowed ip range
         """
         # check IP
         inherit = self.inherit_default_permissions
         return AuthUser.check_ip_allowed(self.user_id, self.ip_addr,
                                          inherit_from_default=inherit)
 
     @classmethod
     def check_ip_allowed(cls, user_id, ip_addr, inherit_from_default):
         allowed_ips = AuthUser.get_allowed_ips(user_id, cache=True,
                         inherit_from_default=inherit_from_default)
         if check_ip_access(source_ip=ip_addr, allowed_ips=allowed_ips):
             log.debug('IP:%s is in range of %s' % (ip_addr, allowed_ips))
             return True
         else:
             log.info('Access for IP:%s forbidden, '
                      'not in %s' % (ip_addr, allowed_ips))
             return False
 
     def __repr__(self):
         return "<AuthUser('id:%s[%s] ip:%s auth:%s')>"\
             % (self.user_id, self.username, self.ip_addr, self.is_authenticated)
 
     def set_authenticated(self, authenticated=True):
         if self.user_id != self.anonymous_user.user_id:
             self.is_authenticated = authenticated
 
     def get_cookie_store(self):
         return {'username': self.username,
                 'user_id': self.user_id,
                 'is_authenticated': self.is_authenticated}
 
     @classmethod
     def from_cookie_store(cls, cookie_store):
         """
         Creates AuthUser from a cookie store
 
         :param cls:
         :param cookie_store:
         """
         user_id = cookie_store.get('user_id')
         username = cookie_store.get('username')
         api_key = cookie_store.get('api_key')
         return AuthUser(user_id, api_key, username)
 
     @classmethod
     def get_allowed_ips(cls, user_id, cache=False, inherit_from_default=False):
         _set = set()
 
         if inherit_from_default:
             default_ips = UserIpMap.query().filter(UserIpMap.user ==
                                             User.get_default_user(cache=True))
             if cache:
                 default_ips = default_ips.options(FromCache("sql_cache_short",
                                                   "get_user_ips_default"))
 
             # populate from default user
             for ip in default_ips:
                 try:
                     _set.add(ip.ip_addr)
                 except ObjectDeletedError:
                     # since we use heavy caching sometimes it happens that we get
                     # deleted objects here, we just skip them
                     pass
 
         user_ips = UserIpMap.query().filter(UserIpMap.user_id == user_id)
         if cache:
             user_ips = user_ips.options(FromCache("sql_cache_short",
                                                   "get_user_ips_%s" % user_id))
 
         for ip in user_ips:
             try:
                 _set.add(ip.ip_addr)
             except ObjectDeletedError:
                 # since we use heavy caching sometimes it happens that we get
                 # deleted objects here, we just skip them
                 pass
         return _set or set(['0.0.0.0/0', '::/0'])
 
 
 def set_available_permissions(config):
     """
     This function will propagate pylons globals with all available defined
     permission given in db. We don't want 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: current pylons config instance
 
     """
     log.info('getting information about all available permissions')
     try:
         sa = meta.Session
         all_perms = sa.query(Permission).all()
         config['available_permissions'] = [x.permission_name for x in all_perms]
     finally:
         meta.Session.remove()
 
 
 #==============================================================================
 # CHECK DECORATORS
 #==============================================================================
+
+def redirect_to_login(message=None):
+    from kallithea.lib import helpers as h
+    p = url.current()
+    h.flash(h.literal(message), category='warning')
+    log.debug('Redirecting to login page, origin: %s' % p)
+    return redirect(url('login_home', came_from=p))
+
 class LoginRequired(object):
     """
     Must be logged in to execute this function else
     redirect to login page
 
     :param api_access: if enabled this checks only for valid auth token
         and grants access based on valid token
     """
 
     def __init__(self, api_access=False):
         self.api_access = api_access
 
     def __call__(self, func):
         return decorator(self.__wrapper, func)
 
     def __wrapper(self, func, *fargs, **fkwargs):
         cls = fargs[0]
         user = cls.authuser
         loc = "%s:%s" % (cls.__class__.__name__, func.__name__)
+        log.debug('Checking access for user %s @ %s' % (user, loc))
 
         # check if our IP is allowed
-        ip_access_valid = True
         if not user.ip_allowed:
-            from kallithea.lib import helpers as h
-            h.flash(h.literal(_('IP %s not allowed' % (user.ip_addr))),
-                    category='warning')
-            ip_access_valid = False
+            return redirect_to_login(_('IP %s not allowed' % (user.ip_addr)))
 
         # check if we used an APIKEY and it's a valid one
         # defined whitelist of controllers which API access will be enabled
         _api_key = request.GET.get('api_key', '')
         api_access_valid = allowed_api_access(loc, api_key=_api_key)
 
         # explicit controller is enabled or API is in our whitelist
         if self.api_access or api_access_valid:
             log.debug('Checking API KEY access for %s' % cls)
             if _api_key and _api_key in user.api_keys:
                 api_access_valid = True
                 log.debug('API KEY ****%s is VALID' % _api_key[-4:])
             else:
                 api_access_valid = False
                 if not _api_key:
                     log.debug("API KEY *NOT* present in request")
                 else:
                     log.warning("API KEY ****%s *NOT* valid" % _api_key[-4:])
 
         # CSRF protection - POSTs with session auth must contain correct token
         if request.POST and user.is_authenticated and not api_access_valid:
             token = request.POST.get(secure_form.token_key)
             if not token or token != secure_form.authentication_token():
                 log.error('CSRF check failed')
                 return abort(403)
 
         log.debug('Checking if %s is authenticated @ %s' % (user.username, loc))
         reason = 'RegularAuth' if user.is_authenticated else 'APIAuth'
 
-        if ip_access_valid and (user.is_authenticated or api_access_valid):
+        if user.is_authenticated or api_access_valid:
             log.info('user %s authenticating with:%s IS authenticated on func %s '
                      % (user, reason, loc)
             )
             return func(*fargs, **fkwargs)
         else:
             log.warning('user %s authenticating with:%s NOT authenticated on func: %s: '
-                     'IP_ACCESS:%s API_ACCESS:%s'
-                     % (user, reason, loc, ip_access_valid, api_access_valid)
+                     'API_ACCESS:%s'
+                     % (user, reason, loc, api_access_valid)
             )
-            p = url.current()
-
-            log.debug('redirecting to login page with %s' % p)
-            return redirect(url('login_home', came_from=p))
-
+            return redirect_to_login()
 
 class NotAnonymous(object):
     """
     Must be logged in to execute this function else
     redirect to login page"""
 
     def __call__(self, func):
         return decorator(self.__wrapper, func)
 
     def __wrapper(self, func, *fargs, **fkwargs):
         cls = fargs[0]
         self.user = cls.authuser
 
         log.debug('Checking if user is not anonymous @%s' % cls)
 
         anonymous = self.user.username == User.DEFAULT_USER
 
         if anonymous:
-            p = url.current()
-
-            import kallithea.lib.helpers as h
-            h.flash(_('You need to be a registered user to '
-                      'perform this action'),
-                    category='warning')
-            return redirect(url('login_home', came_from=p))
+            return redirect_to_login(_('You need to be a registered user to '
+                    'perform this action'))
         else:
             return func(*fargs, **fkwargs)
 
 
 class PermsDecorator(object):
     """Base class for controller decorators"""
 
     def __init__(self, *required_perms):
         self.required_perms = set(required_perms)
         self.user_perms = None
 
     def __call__(self, func):
         return decorator(self.__wrapper, func)
 
     def __wrapper(self, func, *fargs, **fkwargs):
         cls = fargs[0]
         self.user = cls.authuser
         self.user_perms = self.user.permissions
         log.debug('checking %s permissions %s for %s %s',
            self.__class__.__name__, self.required_perms, cls, self.user)
 
         if self.check_permissions():
             log.debug('Permission granted for %s %s' % (cls, self.user))
             return func(*fargs, **fkwargs)
 
         else:
             log.debug('Permission denied for %s %s' % (cls, self.user))
             anonymous = self.user.username == User.DEFAULT_USER
 
             if anonymous:
-                p = url.current()
-
-                import kallithea.lib.helpers as h
-                h.flash(_('You need to be signed in to '
-                          'view this page'),
-                        category='warning')
-                return redirect(url('login_home', came_from=p))
-
+                return redirect_to_login(_('You need to be signed in to view this page'))
             else:
                 # redirect with forbidden ret code
                 return abort(403)
 
     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.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.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
 
 
 class HasRepoGroupPermissionAllDecorator(PermsDecorator):
     """
     Checks for access permission for all given predicates for specific
     repository group. All of them have to be meet in order to fulfill the request
     """
 
     def check_permissions(self):
         group_name = get_repo_group_slug(request)
         try:
             user_perms = set([self.user_perms['repositories_groups'][group_name]])
         except KeyError:
             return False
 
         if self.required_perms.issubset(user_perms):
             return True
         return False
 
 
 class HasRepoGroupPermissionAnyDecorator(PermsDecorator):
     """
     Checks for access permission for any of given predicates for specific
     repository group. In order to fulfill the request any of predicates must be meet
     """
 
     def check_permissions(self):
         group_name = get_repo_group_slug(request)
         try:
             user_perms = set([self.user_perms['repositories_groups'][group_name]])
         except KeyError:
             return False
 
         if self.required_perms.intersection(user_perms):
             return True
         return False
 
 
 class HasUserGroupPermissionAllDecorator(PermsDecorator):
     """
     Checks for access permission for all given predicates for specific
     user group. All of them have to be meet in order to fulfill the request
     """
 
     def check_permissions(self):
         group_name = get_user_group_slug(request)
         try:
             user_perms = set([self.user_perms['user_groups'][group_name]])
         except KeyError:
             return False
 
         if self.required_perms.issubset(user_perms):
             return True
         return False
 
 
 class HasUserGroupPermissionAnyDecorator(PermsDecorator):
     """
     Checks for access permission for any of given predicates for specific
     user group. In order to fulfill the request any of predicates must be meet
     """
 
     def check_permissions(self):
         group_name = get_user_group_slug(request)
         try:
             user_perms = set([self.user_perms['user_groups'][group_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):
         self.required_perms = set(perms)
         self.user_perms = None
         self.repo_name = None
         self.group_name = None
 
     def __call__(self, check_location='', user=None):
         if not user:
             #TODO: remove this someday,put as user as attribute here
             user = request.user
 
         # init auth user if not already given
         if not isinstance(user, AuthUser):
             user = AuthUser(user.user_id)
 
         cls_name = self.__class__.__name__
         check_scope = {
             'HasPermissionAll': '',
             'HasPermissionAny': '',
             'HasRepoPermissionAll': 'repo:%s' % self.repo_name,
             'HasRepoPermissionAny': 'repo:%s' % self.repo_name,
             'HasRepoGroupPermissionAll': 'group:%s' % self.group_name,
             'HasRepoGroupPermissionAny': 'group:%s' % self.group_name,
         }.get(cls_name, '?')
         log.debug('checking cls:%s %s usr:%s %s @ %s', cls_name,
                   self.required_perms, user, check_scope,
                   check_location or 'unspecified location')
         if not user:
             log.debug('Empty request user')
             return False
         self.user_perms = user.permissions
         if self.check_permissions():
             log.debug('Permission to %s granted for user: %s @ %s'
                       % (check_scope, user,
                          check_location or 'unspecified location'))
             return True
 
         else:
             log.debug('Permission to %s denied for user: %s @ %s'
                       % (check_scope, user,
                          check_location or 'unspecified 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.get('global')):
             return True
         return False
 
 
 class HasPermissionAny(PermsFunction):
     def check_permissions(self):
         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='', user=None):
         self.repo_name = repo_name
         return super(HasRepoPermissionAll, self).__call__(check_location, user)
 
     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'][self.repo_name]]
             )
         except KeyError:
             return False
         if self.required_perms.issubset(self._user_perms):
             return True
         return False
 
 
 class HasRepoPermissionAny(PermsFunction):
     def __call__(self, repo_name=None, check_location='', user=None):
         self.repo_name = repo_name
         return super(HasRepoPermissionAny, self).__call__(check_location, user)
 
     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'][self.repo_name]]
             )
         except KeyError:
             return False
         if self.required_perms.intersection(self._user_perms):
             return True
         return False
 
 
 class HasRepoGroupPermissionAny(PermsFunction):
     def __call__(self, group_name=None, check_location='', user=None):
         self.group_name = group_name
         return super(HasRepoGroupPermissionAny, self).__call__(check_location, user)
 
     def check_permissions(self):
         try:
             self._user_perms = set(
                 [self.user_perms['repositories_groups'][self.group_name]]
             )
         except KeyError:
             return False
         if self.required_perms.intersection(self._user_perms):
             return True
         return False
 
 
 class HasRepoGroupPermissionAll(PermsFunction):
     def __call__(self, group_name=None, check_location='', user=None):
         self.group_name = group_name
         return super(HasRepoGroupPermissionAll, self).__call__(check_location, user)
 
     def check_permissions(self):
         try:
             self._user_perms = set(
                 [self.user_perms['repositories_groups'][self.group_name]]
             )
         except KeyError:
             return False
         if self.required_perms.issubset(self._user_perms):
             return True
         return False
 
 
 class HasUserGroupPermissionAny(PermsFunction):
     def __call__(self, user_group_name=None, check_location='', user=None):
         self.user_group_name = user_group_name
         return super(HasUserGroupPermissionAny, self).__call__(check_location, user)
 
     def check_permissions(self):
         try:
             self._user_perms = set(
                 [self.user_perms['user_groups'][self.user_group_name]]
             )
         except KeyError:
             return False
         if self.required_perms.intersection(self._user_perms):
             return True
         return False
 
 
 class HasUserGroupPermissionAll(PermsFunction):
     def __call__(self, user_group_name=None, check_location='', user=None):
         self.user_group_name = user_group_name
         return super(HasUserGroupPermissionAll, self).__call__(check_location, user)
 
     def check_permissions(self):
         try:
             self._user_perms = set(
                 [self.user_perms['user_groups'][self.user_group_name]]
             )
         except KeyError:
             return False
         if self.required_perms.issubset(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):
         # repo_name MUST be unicode, since we handle keys in permission
         # dict by unicode
         repo_name = safe_unicode(repo_name)
         usr = AuthUser(user.user_id)
         self.user_perms = set([usr.permissions['repositories'][repo_name]])
         self.username = user.username
         self.repo_name = repo_name
         return self.check_permissions()
 
     def check_permissions(self):
         log.debug('checking VCS protocol '
                   'permissions %s for user:%s repository:%s', self.user_perms,
                                                 self.username, self.repo_name)
         if self.required_perms.intersection(self.user_perms):
             log.debug('Permission to repo: %s granted for user: %s @ %s'
                       % (self.repo_name, self.username, 'PermissionMiddleware'))
             return True
         log.debug('Permission to repo: %s denied for user: %s @ %s'
                   % (self.repo_name, self.username, 'PermissionMiddleware'))
         return False
 
 
 #==============================================================================
 # SPECIAL VERSION TO HANDLE API AUTH
 #==============================================================================
 class _BaseApiPerm(object):
     def __init__(self, *perms):
         self.required_perms = set(perms)
 
     def __call__(self, check_location=None, user=None, repo_name=None,
                  group_name=None):
         cls_name = self.__class__.__name__
         check_scope = 'user:%s' % (user)
         if repo_name:
             check_scope += ', repo:%s' % (repo_name)
 
         if group_name:
             check_scope += ', repo group:%s' % (group_name)
 
         log.debug('checking cls:%s %s %s @ %s'
                   % (cls_name, self.required_perms, check_scope, check_location))
         if not user:
             log.debug('Empty User passed into arguments')
             return False
 
         ## process user
         if not isinstance(user, AuthUser):
             user = AuthUser(user.user_id)
         if not check_location:
             check_location = 'unspecified'
         if self.check_permissions(user.permissions, repo_name, group_name):
             log.debug('Permission to %s granted for user: %s @ %s'
                       % (check_scope, user, check_location))
             return True
 
         else:
             log.debug('Permission to %s denied for user: %s @ %s'
                       % (check_scope, user, check_location))
             return False
 
     def check_permissions(self, perm_defs, repo_name=None, group_name=None):
         """
         implement in child class should return True if permissions are ok,
         False otherwise
 
         :param perm_defs: dict with permission definitions
         :param repo_name: repo name
         """
         raise NotImplementedError()
 
 
 class HasPermissionAllApi(_BaseApiPerm):
     def check_permissions(self, perm_defs, repo_name=None, group_name=None):
         if self.required_perms.issubset(perm_defs.get('global')):
             return True
         return False
 
 
 class HasPermissionAnyApi(_BaseApiPerm):
     def check_permissions(self, perm_defs, repo_name=None, group_name=None):
         if self.required_perms.intersection(perm_defs.get('global')):
             return True
         return False
 
 
 class HasRepoPermissionAllApi(_BaseApiPerm):
     def check_permissions(self, perm_defs, repo_name=None, group_name=None):
         try:
             _user_perms = set([perm_defs['repositories'][repo_name]])
         except KeyError:
             log.warning(traceback.format_exc())
             return False
         if self.required_perms.issubset(_user_perms):
             return True
         return False
 
 
 class HasRepoPermissionAnyApi(_BaseApiPerm):
     def check_permissions(self, perm_defs, repo_name=None, group_name=None):
         try:
             _user_perms = set([perm_defs['repositories'][repo_name]])
         except KeyError:
             log.warning(traceback.format_exc())
             return False
         if self.required_perms.intersection(_user_perms):
             return True
         return False
 
 
 class HasRepoGroupPermissionAnyApi(_BaseApiPerm):
     def check_permissions(self, perm_defs, repo_name=None, group_name=None):
         try:
             _user_perms = set([perm_defs['repositories_groups'][group_name]])
         except KeyError:
             log.warning(traceback.format_exc())
             return False
         if self.required_perms.intersection(_user_perms):
             return True
         return False
 
 class HasRepoGroupPermissionAllApi(_BaseApiPerm):
     def check_permissions(self, perm_defs, repo_name=None, group_name=None):
         try:
             _user_perms = set([perm_defs['repositories_groups'][group_name]])
         except KeyError:
             log.warning(traceback.format_exc())
             return False
         if self.required_perms.issubset(_user_perms):
             return True
         return False
 
 def check_ip_access(source_ip, allowed_ips=None):
     """
     Checks if source_ip is a subnet of any of allowed_ips.
 
     :param source_ip:
     :param allowed_ips: list of allowed ips together with mask
     """
     from kallithea.lib import ipaddr
     log.debug('checking if ip:%s is subnet of %s' % (source_ip, allowed_ips))
     if isinstance(allowed_ips, (tuple, list, set)):
         for ip in allowed_ips:
             if ipaddr.IPAddress(source_ip) in ipaddr.IPNetwork(ip):
                 log.debug('IP %s is network %s' %
                           (ipaddr.IPAddress(source_ip), ipaddr.IPNetwork(ip)))
                 return True
     return False