auth: don't break hashing in case of user with empty password.

In some cases such as LDAP user created via external scripts users might
set the passwords to empty. The hashing uses the md5(password_hash) to
store reference to detect password changes and forbid using the same password.

In case of pure LDAP users this is not valid, and we shouldn't raise Errors in such
case. This change makes it work for empty passwords now.

rhodecode/lib/auth.py

@@ -1,2192 +1,2192 b''
 # -*- coding: utf-8 -*-
 
 # Copyright (C) 2010-2017 RhodeCode GmbH
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License, version 3
 # (only), as published by the Free Software Foundation.
 #
 # 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 Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 # This program is dual-licensed. If you wish to learn more about the
 # RhodeCode Enterprise Edition, including its added features, Support services,
 # and proprietary license terms, please see https://rhodecode.com/licenses/
 
 """
 authentication and permission libraries
 """
 
 import os
 import inspect
 import collections
 import fnmatch
 import hashlib
 import itertools
 import logging
 import random
 import traceback
 from functools import wraps
 
 import ipaddress
 from beaker.cache import cache_region
 from pyramid.httpexceptions import HTTPForbidden, HTTPFound, HTTPNotFound
 from pylons.i18n.translation import _
 # NOTE(marcink): this has to be removed only after pyramid migration,
 # replace with _ = request.translate
 from sqlalchemy.orm.exc import ObjectDeletedError
 from sqlalchemy.orm import joinedload
 from zope.cachedescriptors.property import Lazy as LazyProperty
 
 import rhodecode
 from rhodecode.model import meta
 from rhodecode.model.meta import Session
 from rhodecode.model.user import UserModel
 from rhodecode.model.db import (
     User, Repository, Permission, UserToPerm, UserGroupToPerm, UserGroupMember,
     UserIpMap, UserApiKeys, RepoGroup, UserGroup)
 from rhodecode.lib import caches
 from rhodecode.lib.utils2 import safe_unicode, aslist, safe_str, md5
 from rhodecode.lib.utils import (
     get_repo_slug, get_repo_group_slug, get_user_group_slug)
 from rhodecode.lib.caching_query import FromCache
 
 
 if rhodecode.is_unix:
     import bcrypt
 
 log = logging.getLogger(__name__)
 
 csrf_token_key = "csrf_token"
 
 
 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 _RhodeCodeCryptoBase(object):
     ENC_PREF = None
 
     def hash_create(self, str_):
         """
         hash the string using
 
         :param str_: password to hash
         """
         raise NotImplementedError
 
     def hash_check_with_upgrade(self, password, hashed):
         """
         Returns tuple in which first element is boolean that states that
         given password matches it's hashed version, and the second is new hash
         of the password, in case this password should be migrated to new
         cipher.
         """
         checked_hash = self.hash_check(password, hashed)
         return checked_hash, None
 
     def hash_check(self, password, hashed):
         """
         Checks matching password with it's hashed value.
 
         :param password: password
         :param hashed: password in hashed form
         """
         raise NotImplementedError
 
     def _assert_bytes(self, value):
         """
         Passing in an `unicode` object can lead to hard to detect issues
         if passwords contain non-ascii characters.  Doing a type check
         during runtime, so that such mistakes are detected early on.
         """
         if not isinstance(value, str):
             raise TypeError(
                 "Bytestring required as input, got %r." % (value, ))
 
 
 class _RhodeCodeCryptoBCrypt(_RhodeCodeCryptoBase):
     ENC_PREF = ('$2a$10', '$2b$10')
 
     def hash_create(self, str_):
         self._assert_bytes(str_)
         return bcrypt.hashpw(str_, bcrypt.gensalt(10))
 
     def hash_check_with_upgrade(self, password, hashed):
         """
         Returns tuple in which first element is boolean that states that
         given password matches it's hashed version, and the second is new hash
         of the password, in case this password should be migrated to new
         cipher.
 
         This implements special upgrade logic which works like that:
          - check if the given password == bcrypted hash, if yes then we
            properly used password and it was already in bcrypt. Proceed
            without any changes
          - if bcrypt hash check is not working try with sha256. If hash compare
            is ok, it means we using correct but old hashed password. indicate
            hash change and proceed
         """
 
         new_hash = None
 
         # regular pw check
         password_match_bcrypt = self.hash_check(password, hashed)
 
         # now we want to know if the password was maybe from sha256
         # basically calling _RhodeCodeCryptoSha256().hash_check()
         if not password_match_bcrypt:
             if _RhodeCodeCryptoSha256().hash_check(password, hashed):
                 new_hash = self.hash_create(password)  # make new bcrypt hash
                 password_match_bcrypt = True
 
         return password_match_bcrypt, new_hash
 
     def hash_check(self, password, hashed):
         """
         Checks matching password with it's hashed value.
 
         :param password: password
         :param hashed: password in hashed form
         """
         self._assert_bytes(password)
         try:
             return bcrypt.hashpw(password, hashed) == hashed
         except ValueError as e:
             # we're having a invalid salt here probably, we should not crash
             # just return with False as it would be a wrong password.
             log.debug('Failed to check password hash using bcrypt %s',
                       safe_str(e))
 
         return False
 
 
 class _RhodeCodeCryptoSha256(_RhodeCodeCryptoBase):
     ENC_PREF = '_'
 
     def hash_create(self, str_):
         self._assert_bytes(str_)
         return hashlib.sha256(str_).hexdigest()
 
     def hash_check(self, password, hashed):
         """
         Checks matching password with it's hashed value.
 
         :param password: password
         :param hashed: password in hashed form
         """
         self._assert_bytes(password)
         return hashlib.sha256(password).hexdigest() == hashed
 
 
 class _RhodeCodeCryptoMd5(_RhodeCodeCryptoBase):
     ENC_PREF = '_'
 
     def hash_create(self, str_):
         self._assert_bytes(str_)
         return hashlib.md5(str_).hexdigest()
 
     def hash_check(self, password, hashed):
         """
         Checks matching password with it's hashed value.
 
         :param password: password
         :param hashed: password in hashed form
         """
         self._assert_bytes(password)
         return hashlib.md5(password).hexdigest() == hashed
 
 
 def crypto_backend():
     """
     Return the matching crypto backend.
 
     Selection is based on if we run tests or not, we pick md5 backend to run
     tests faster since BCRYPT is expensive to calculate
     """
     if rhodecode.is_test:
         RhodeCodeCrypto = _RhodeCodeCryptoMd5()
     else:
         RhodeCodeCrypto = _RhodeCodeCryptoBCrypt()
 
     return RhodeCodeCrypto
 
 
 def get_crypt_password(password):
     """
     Create the hash of `password` with the active crypto backend.
 
     :param password: The cleartext password.
     :type password: unicode
     """
     password = safe_str(password)
     return crypto_backend().hash_create(password)
 
 
 def check_password(password, hashed):
     """
     Check if the value in `password` matches the hash in `hashed`.
 
     :param password: The cleartext password.
     :type password: unicode
 
     :param hashed: The expected hashed version of the password.
     :type hashed: The hash has to be passed in in text representation.
     """
     password = safe_str(password)
     return crypto_backend().hash_check(password, hashed)
 
 
 def generate_auth_token(data, salt=None):
     """
     Generates API KEY from given string
     """
 
     if salt is None:
         salt = os.urandom(16)
     return hashlib.sha1(safe_str(data) + salt).hexdigest()
 
 
 def get_came_from(request):
     """
     get query_string+path from request sanitized after removing auth_token
     """
     _req = request
 
     path = _req.path
     if 'auth_token' in _req.GET:
         # sanitize the request and remove auth_token for redirection
         _req.GET.pop('auth_token')
     qs = _req.query_string
     if qs:
         path += '?' + qs
 
     return path
 
 
 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, scope, user_is_admin,
                        user_inherit_default_permissions, explicit, algo,
                        calculate_super_admin):
 
     permissions = PermissionCalculator(
         user_id, scope, user_is_admin, user_inherit_default_permissions,
         explicit, algo, calculate_super_admin)
     return permissions.calculate()
 
 
 class PermOrigin(object):
     SUPER_ADMIN = 'superadmin'
 
     REPO_USER = 'user:%s'
     REPO_USERGROUP = 'usergroup:%s'
     REPO_OWNER = 'repo.owner'
     REPO_DEFAULT = 'repo.default'
     REPO_DEFAULT_NO_INHERIT = 'repo.default.no.inherit'
     REPO_PRIVATE = 'repo.private'
 
     REPOGROUP_USER = 'user:%s'
     REPOGROUP_USERGROUP = 'usergroup:%s'
     REPOGROUP_OWNER = 'group.owner'
     REPOGROUP_DEFAULT = 'group.default'
     REPOGROUP_DEFAULT_NO_INHERIT = 'group.default.no.inherit'
 
     USERGROUP_USER = 'user:%s'
     USERGROUP_USERGROUP = 'usergroup:%s'
     USERGROUP_OWNER = 'usergroup.owner'
     USERGROUP_DEFAULT = 'usergroup.default'
     USERGROUP_DEFAULT_NO_INHERIT = 'usergroup.default.no.inherit'
 
 
 class PermOriginDict(dict):
     """
     A special dict used for tracking permissions along with their origins.
 
     `__setitem__` has been overridden to expect a tuple(perm, origin)
     `__getitem__` will return only the perm
     `.perm_origin_stack` will return the stack of (perm, origin) set per key
 
     >>> perms = PermOriginDict()
     >>> perms['resource'] = 'read', 'default'
     >>> perms['resource']
     'read'
     >>> perms['resource'] = 'write', 'admin'
     >>> perms['resource']
     'write'
     >>> perms.perm_origin_stack
     {'resource': [('read', 'default'), ('write', 'admin')]}
     """
 
     def __init__(self, *args, **kw):
         dict.__init__(self, *args, **kw)
         self.perm_origin_stack = collections.OrderedDict()
 
     def __setitem__(self, key, (perm, origin)):
         self.perm_origin_stack.setdefault(key, []).append((perm, origin))
         dict.__setitem__(self, key, perm)
 
 
 class PermissionCalculator(object):
 
     def __init__(
             self, user_id, scope, user_is_admin,
             user_inherit_default_permissions, explicit, algo,
             calculate_super_admin=False):
 
         self.user_id = user_id
         self.user_is_admin = user_is_admin
         self.inherit_default_permissions = user_inherit_default_permissions
         self.explicit = explicit
         self.algo = algo
         self.calculate_super_admin = calculate_super_admin
 
         scope = scope or {}
         self.scope_repo_id = scope.get('repo_id')
         self.scope_repo_group_id = scope.get('repo_group_id')
         self.scope_user_group_id = scope.get('user_group_id')
 
         self.default_user_id = User.get_default_user(cache=True).user_id
 
         self.permissions_repositories = PermOriginDict()
         self.permissions_repository_groups = PermOriginDict()
         self.permissions_user_groups = PermOriginDict()
         self.permissions_global = set()
 
         self.default_repo_perms = Permission.get_default_repo_perms(
             self.default_user_id, self.scope_repo_id)
         self.default_repo_groups_perms = Permission.get_default_group_perms(
             self.default_user_id, self.scope_repo_group_id)
         self.default_user_group_perms = \
             Permission.get_default_user_group_perms(
                 self.default_user_id, self.scope_user_group_id)
 
     def calculate(self):
         if self.user_is_admin and not self.calculate_super_admin:
             return self._admin_permissions()
 
         self._calculate_global_default_permissions()
         self._calculate_global_permissions()
         self._calculate_default_permissions()
         self._calculate_repository_permissions()
         self._calculate_repository_group_permissions()
         self._calculate_user_group_permissions()
         return self._permission_structure()
 
     def _admin_permissions(self):
         """
         admin user have all default rights for repositories
         and groups set to admin
         """
         self.permissions_global.add('hg.admin')
         self.permissions_global.add('hg.create.write_on_repogroup.true')
 
         # repositories
         for perm in self.default_repo_perms:
             r_k = perm.UserRepoToPerm.repository.repo_name
             p = 'repository.admin'
             self.permissions_repositories[r_k] = p, PermOrigin.SUPER_ADMIN
 
         # repository groups
         for perm in self.default_repo_groups_perms:
             rg_k = perm.UserRepoGroupToPerm.group.group_name
             p = 'group.admin'
             self.permissions_repository_groups[rg_k] = p, PermOrigin.SUPER_ADMIN
 
         # user groups
         for perm in self.default_user_group_perms:
             u_k = perm.UserUserGroupToPerm.user_group.users_group_name
             p = 'usergroup.admin'
             self.permissions_user_groups[u_k] = p, PermOrigin.SUPER_ADMIN
 
         return self._permission_structure()
 
     def _calculate_global_default_permissions(self):
         """
         global permissions taken from the default user
         """
         default_global_perms = UserToPerm.query()\
             .filter(UserToPerm.user_id == self.default_user_id)\
             .options(joinedload(UserToPerm.permission))
 
         for perm in default_global_perms:
             self.permissions_global.add(perm.permission.permission_name)
 
         if self.user_is_admin:
             self.permissions_global.add('hg.admin')
             self.permissions_global.add('hg.create.write_on_repogroup.true')
 
     def _calculate_global_permissions(self):
         """
         Set global system permissions with user permissions or permissions
         taken from the user groups of the current user.
 
         The permissions include repo creating, repo group creating, forking
         etc.
         """
 
         # now we read the defined permissions and overwrite what we have set
         # before those can be configured from groups or users explicitly.
 
         # TODO: johbo: This seems to be out of sync, find out the reason
         # for the comment below and update it.
 
         # In case we want to extend this list we should be always in sync with
         # User.DEFAULT_USER_PERMISSIONS definitions
         _configurable = frozenset([
             'hg.fork.none', 'hg.fork.repository',
             'hg.create.none', 'hg.create.repository',
             'hg.usergroup.create.false', 'hg.usergroup.create.true',
             'hg.repogroup.create.false', 'hg.repogroup.create.true',
             'hg.create.write_on_repogroup.false',
             'hg.create.write_on_repogroup.true',
             'hg.inherit_default_perms.false', 'hg.inherit_default_perms.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 == self.user_id)\
             .order_by(UserGroupToPerm.users_group_id)\
             .all()
 
         # need to group here by groups since user can be in more than
         # one group, so we get all groups
         _explicit_grouped_perms = [
             [x, list(y)] for x, y in
             itertools.groupby(user_perms_from_users_groups,
                               lambda _x: _x.users_group)]
 
         for gr, perms in _explicit_grouped_perms:
             # since user can be in multiple groups iterate over them and
             # select the lowest permissions first (more explicit)
             # TODO: marcink: do this^^
 
             # group doesn't inherit default permissions so we actually set them
             if not gr.inherit_default_permissions:
                 # NEED TO IGNORE all previously set configurable permissions
                 # and replace them with explicitly set from this user
                 # group permissions
                 self.permissions_global = self.permissions_global.difference(
                     _configurable)
                 for perm in perms:
                     self.permissions_global.add(perm.permission.permission_name)
 
         # user explicit global permissions
         user_perms = Session().query(UserToPerm)\
             .options(joinedload(UserToPerm.permission))\
             .filter(UserToPerm.user_id == self.user_id).all()
 
         if not self.inherit_default_permissions:
             # NEED TO IGNORE all configurable permissions and
             # replace them with explicitly set from this user permissions
             self.permissions_global = self.permissions_global.difference(
                 _configurable)
             for perm in user_perms:
                 self.permissions_global.add(perm.permission.permission_name)
 
     def _calculate_default_permissions(self):
         """
         Set default user permissions for repositories, repository groups
         taken from the default user.
 
         Calculate inheritance of object permissions based on what we have now
         in GLOBAL permissions. We check if .false is in GLOBAL since this is
         explicitly set. Inherit is the opposite of .false being there.
 
         .. note::
 
            the syntax is little bit odd but what we need to check here is
            the opposite of .false permission being in the list so even for
            inconsistent state when both .true/.false is there
            .false is more important
 
         """
         user_inherit_object_permissions = not ('hg.inherit_default_perms.false'
                                                in self.permissions_global)
 
         # defaults for repositories, taken from `default` user permissions
         # on given repo
         for perm in self.default_repo_perms:
             r_k = perm.UserRepoToPerm.repository.repo_name
             p = perm.Permission.permission_name
             o = PermOrigin.REPO_DEFAULT
             self.permissions_repositories[r_k] = p, o
 
             # if we decide this user isn't inheriting permissions from
             # default user we set him to .none so only explicit
             # permissions work
             if not user_inherit_object_permissions:
                 p = 'repository.none'
                 o = PermOrigin.REPO_DEFAULT_NO_INHERIT
                 self.permissions_repositories[r_k] = p, o
 
             if perm.Repository.private and not (
                     perm.Repository.user_id == self.user_id):
                 # disable defaults for private repos,
                 p = 'repository.none'
                 o = PermOrigin.REPO_PRIVATE
                 self.permissions_repositories[r_k] = p, o
 
             elif perm.Repository.user_id == self.user_id:
                 # set admin if owner
                 p = 'repository.admin'
                 o = PermOrigin.REPO_OWNER
                 self.permissions_repositories[r_k] = p, o
 
             if self.user_is_admin:
                 p = 'repository.admin'
                 o = PermOrigin.SUPER_ADMIN
                 self.permissions_repositories[r_k] = p, o
 
         # defaults for repository groups taken from `default` user permission
         # on given group
         for perm in self.default_repo_groups_perms:
             rg_k = perm.UserRepoGroupToPerm.group.group_name
             p = perm.Permission.permission_name
             o = PermOrigin.REPOGROUP_DEFAULT
             self.permissions_repository_groups[rg_k] = p, o
 
             # if we decide this user isn't inheriting permissions from default
             # user we set him to .none so only explicit permissions work
             if not user_inherit_object_permissions:
                 p = 'group.none'
                 o = PermOrigin.REPOGROUP_DEFAULT_NO_INHERIT
                 self.permissions_repository_groups[rg_k] = p, o
 
             if perm.RepoGroup.user_id == self.user_id:
                 # set admin if owner
                 p = 'group.admin'
                 o = PermOrigin.REPOGROUP_OWNER
                 self.permissions_repository_groups[rg_k] = p, o
 
             if self.user_is_admin:
                 p = 'group.admin'
                 o = PermOrigin.SUPER_ADMIN
                 self.permissions_repository_groups[rg_k] = p, o
 
         # defaults for user groups taken from `default` user permission
         # on given user group
         for perm in self.default_user_group_perms:
             u_k = perm.UserUserGroupToPerm.user_group.users_group_name
             p = perm.Permission.permission_name
             o = PermOrigin.USERGROUP_DEFAULT
             self.permissions_user_groups[u_k] = p, o
 
             # if we decide this user isn't inheriting permissions from default
             # user we set him to .none so only explicit permissions work
             if not user_inherit_object_permissions:
                 p = 'usergroup.none'
                 o = PermOrigin.USERGROUP_DEFAULT_NO_INHERIT
                 self.permissions_user_groups[u_k] = p, o
 
             if perm.UserGroup.user_id == self.user_id:
                 # set admin if owner
                 p = 'usergroup.admin'
                 o = PermOrigin.USERGROUP_OWNER
                 self.permissions_user_groups[u_k] = p, o
 
             if self.user_is_admin:
                 p = 'usergroup.admin'
                 o = PermOrigin.SUPER_ADMIN
                 self.permissions_user_groups[u_k] = p, o
 
     def _calculate_repository_permissions(self):
         """
         Repository permissions for the current user.
 
         Check if the user is part of user groups for this repository and
         fill in the permission from it. `_choose_permission` decides of which
         permission should be selected based on selected method.
         """
 
         # user group for repositories permissions
         user_repo_perms_from_user_group = Permission\
             .get_default_repo_perms_from_user_group(
                 self.user_id, self.scope_repo_id)
 
         multiple_counter = collections.defaultdict(int)
         for perm in user_repo_perms_from_user_group:
             r_k = perm.UserGroupRepoToPerm.repository.repo_name
             multiple_counter[r_k] += 1
             p = perm.Permission.permission_name
             o = PermOrigin.REPO_USERGROUP % perm.UserGroupRepoToPerm\
                 .users_group.users_group_name
 
             if multiple_counter[r_k] > 1:
                 cur_perm = self.permissions_repositories[r_k]
                 p = self._choose_permission(p, cur_perm)
 
             self.permissions_repositories[r_k] = p, o
 
             if perm.Repository.user_id == self.user_id:
                 # set admin if owner
                 p = 'repository.admin'
                 o = PermOrigin.REPO_OWNER
                 self.permissions_repositories[r_k] = p, o
 
             if self.user_is_admin:
                 p = 'repository.admin'
                 o = PermOrigin.SUPER_ADMIN
                 self.permissions_repositories[r_k] = p, o
 
         # user explicit permissions for repositories, overrides any specified
         # by the group permission
         user_repo_perms = Permission.get_default_repo_perms(
             self.user_id, self.scope_repo_id)
         for perm in user_repo_perms:
             r_k = perm.UserRepoToPerm.repository.repo_name
             p = perm.Permission.permission_name
             o = PermOrigin.REPO_USER % perm.UserRepoToPerm.user.username
 
             if not self.explicit:
                 cur_perm = self.permissions_repositories.get(
                     r_k, 'repository.none')
                 p = self._choose_permission(p, cur_perm)
 
             self.permissions_repositories[r_k] = p, o
 
             if perm.Repository.user_id == self.user_id:
                 # set admin if owner
                 p = 'repository.admin'
                 o = PermOrigin.REPO_OWNER
                 self.permissions_repositories[r_k] = p, o
 
             if self.user_is_admin:
                 p = 'repository.admin'
                 o = PermOrigin.SUPER_ADMIN
                 self.permissions_repositories[r_k] = p, o
 
     def _calculate_repository_group_permissions(self):
         """
         Repository group permissions for the current user.
 
         Check if the user is part of user groups for repository groups and
         fill in the permissions from it. `_choose_permission` decides of which
         permission should be selected based on selected method.
         """
         # user group for repo groups permissions
         user_repo_group_perms_from_user_group = Permission\
             .get_default_group_perms_from_user_group(
                 self.user_id, self.scope_repo_group_id)
 
         multiple_counter = collections.defaultdict(int)
         for perm in user_repo_group_perms_from_user_group:
             rg_k = perm.UserGroupRepoGroupToPerm.group.group_name
             multiple_counter[rg_k] += 1
             o = PermOrigin.REPOGROUP_USERGROUP % perm.UserGroupRepoGroupToPerm\
                 .users_group.users_group_name
             p = perm.Permission.permission_name
 
             if multiple_counter[rg_k] > 1:
                 cur_perm = self.permissions_repository_groups[rg_k]
                 p = self._choose_permission(p, cur_perm)
             self.permissions_repository_groups[rg_k] = p, o
 
             if perm.RepoGroup.user_id == self.user_id:
                 # set admin if owner, even for member of other user group
                 p = 'group.admin'
                 o = PermOrigin.REPOGROUP_OWNER
                 self.permissions_repository_groups[rg_k] = p, o
 
             if self.user_is_admin:
                 p = 'group.admin'
                 o = PermOrigin.SUPER_ADMIN
                 self.permissions_repository_groups[rg_k] = p, o
 
         # user explicit permissions for repository groups
         user_repo_groups_perms = Permission.get_default_group_perms(
             self.user_id, self.scope_repo_group_id)
         for perm in user_repo_groups_perms:
             rg_k = perm.UserRepoGroupToPerm.group.group_name
             o = PermOrigin.REPOGROUP_USER % perm.UserRepoGroupToPerm\
                 .user.username
             p = perm.Permission.permission_name
 
             if not self.explicit:
                 cur_perm = self.permissions_repository_groups.get(
                     rg_k, 'group.none')
                 p = self._choose_permission(p, cur_perm)
 
             self.permissions_repository_groups[rg_k] = p, o
 
             if perm.RepoGroup.user_id == self.user_id:
                 # set admin if owner
                 p = 'group.admin'
                 o = PermOrigin.REPOGROUP_OWNER
                 self.permissions_repository_groups[rg_k] = p, o
 
             if self.user_is_admin:
                 p = 'group.admin'
                 o = PermOrigin.SUPER_ADMIN
                 self.permissions_repository_groups[rg_k] = p, o
 
     def _calculate_user_group_permissions(self):
         """
         User group permissions for the current user.
         """
         # user group for user group permissions
         user_group_from_user_group = Permission\
             .get_default_user_group_perms_from_user_group(
                 self.user_id, self.scope_user_group_id)
 
         multiple_counter = collections.defaultdict(int)
         for perm in user_group_from_user_group:
             ug_k = perm.UserGroupUserGroupToPerm\
                 .target_user_group.users_group_name
             multiple_counter[ug_k] += 1
             o = PermOrigin.USERGROUP_USERGROUP % perm.UserGroupUserGroupToPerm\
                 .user_group.users_group_name
             p = perm.Permission.permission_name
 
             if multiple_counter[ug_k] > 1:
                 cur_perm = self.permissions_user_groups[ug_k]
                 p = self._choose_permission(p, cur_perm)
 
             self.permissions_user_groups[ug_k] = p, o
 
             if perm.UserGroup.user_id == self.user_id:
                 # set admin if owner, even for member of other user group
                 p = 'usergroup.admin'
                 o = PermOrigin.USERGROUP_OWNER
                 self.permissions_user_groups[ug_k] = p, o
 
             if self.user_is_admin:
                 p = 'usergroup.admin'
                 o = PermOrigin.SUPER_ADMIN
                 self.permissions_user_groups[ug_k] = p, o
 
         # user explicit permission for user groups
         user_user_groups_perms = Permission.get_default_user_group_perms(
             self.user_id, self.scope_user_group_id)
         for perm in user_user_groups_perms:
             ug_k = perm.UserUserGroupToPerm.user_group.users_group_name
             o = PermOrigin.USERGROUP_USER % perm.UserUserGroupToPerm\
                 .user.username
             p = perm.Permission.permission_name
 
             if not self.explicit:
                 cur_perm = self.permissions_user_groups.get(
                     ug_k, 'usergroup.none')
                 p = self._choose_permission(p, cur_perm)
 
             self.permissions_user_groups[ug_k] = p, o
 
             if perm.UserGroup.user_id == self.user_id:
                 # set admin if owner
                 p = 'usergroup.admin'
                 o = PermOrigin.USERGROUP_OWNER
                 self.permissions_user_groups[ug_k] = p, o
 
             if self.user_is_admin:
                 p = 'usergroup.admin'
                 o = PermOrigin.SUPER_ADMIN
                 self.permissions_user_groups[ug_k] = p, o
 
     def _choose_permission(self, new_perm, cur_perm):
         new_perm_val = Permission.PERM_WEIGHTS[new_perm]
         cur_perm_val = Permission.PERM_WEIGHTS[cur_perm]
         if self.algo == 'higherwin':
             if new_perm_val > cur_perm_val:
                 return new_perm
             return cur_perm
         elif self.algo == 'lowerwin':
             if new_perm_val < cur_perm_val:
                 return new_perm
             return cur_perm
 
     def _permission_structure(self):
         return {
             'global': self.permissions_global,
             'repositories': self.permissions_repositories,
             'repositories_groups': self.permissions_repository_groups,
             'user_groups': self.permissions_user_groups,
         }
 
 
 def allowed_auth_token_access(view_name, auth_token, whitelist=None):
     """
     Check if given controller_name is in whitelist of auth token access
     """
     if not whitelist:
         from rhodecode import CONFIG
         whitelist = aslist(
             CONFIG.get('api_access_controllers_whitelist'), sep=',')
     # backward compat translation
     compat = {
         # old controller, new VIEW
         'ChangesetController:*': 'RepoCommitsView:*',
         'ChangesetController:changeset_patch': 'RepoCommitsView:repo_commit_patch',
         'ChangesetController:changeset_raw': 'RepoCommitsView:repo_commit_raw',
         'FilesController:raw': 'RepoCommitsView:repo_commit_raw',
         'FilesController:archivefile': 'RepoFilesView:repo_archivefile',
         'GistsController:*': 'GistView:*',
     }
 
     log.debug(
         'Allowed views for AUTH TOKEN access: %s' % (whitelist,))
     auth_token_access_valid = False
 
     for entry in whitelist:
         token_match = True
         if entry in compat:
             # translate from old Controllers to Pyramid Views
             entry = compat[entry]
 
         if '@' in entry:
             # specific AuthToken
             entry, allowed_token = entry.split('@', 1)
             token_match = auth_token == allowed_token
 
         if fnmatch.fnmatch(view_name, entry) and token_match:
             auth_token_access_valid = True
             break
 
     if auth_token_access_valid:
         log.debug('view: `%s` matches entry in whitelist: %s'
                   % (view_name, whitelist))
     else:
         msg = ('view: `%s` does *NOT* match any entry in whitelist: %s'
                % (view_name, whitelist))
         if auth_token:
             # if we use auth token key and don't have access it's a warning
             log.warning(msg)
         else:
             log.debug(msg)
 
     return auth_token_access_valid
 
 
 class AuthUser(object):
     """
     A simple object that handles all attributes of user in RhodeCode
 
     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
     """
     GLOBAL_PERMS = [x[0] for x in Permission.PERMS]
 
     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.feed_token = ''
         self.username = username
         self.ip_addr = ip_addr
         self.name = ''
         self.lastname = ''
         self.first_name = ''
         self.last_name = ''
         self.email = ''
         self.is_authenticated = False
         self.admin = False
         self.inherit_default_permissions = False
         self.password = ''
 
         self.anonymous_user = None  # propagated on propagate_data
         self.propagate_data()
         self._instance = None
         self._permissions_scoped_cache = {}  # used to bind scoped calculation
 
     @LazyProperty
     def permissions(self):
         return self.get_perms(user=self, cache=False)
 
     @LazyProperty
     def permissions_safe(self):
         """
         Filtered permissions excluding not allowed repositories
         """
         perms = self.get_perms(user=self, cache=False)
 
         perms['repositories'] = {
             k: v for k, v in perms['repositories'].iteritems()
             if v != 'repository.none'}
         perms['repositories_groups'] = {
             k: v for k, v in perms['repositories_groups'].iteritems()
             if v != 'group.none'}
         perms['user_groups'] = {
             k: v for k, v in perms['user_groups'].iteritems()
             if v != 'usergroup.none'}
         return perms
 
     @LazyProperty
     def permissions_full_details(self):
         return self.get_perms(
             user=self, cache=False, calculate_super_admin=True)
 
     def permissions_with_scope(self, scope):
         """
         Call the get_perms function with scoped data. The scope in that function
         narrows the SQL calls to the given ID of objects resulting in fetching
         Just particular permission we want to obtain. If scope is an empty dict
         then it basically narrows the scope to GLOBAL permissions only.
 
         :param scope: dict
         """
         if 'repo_name' in scope:
             obj = Repository.get_by_repo_name(scope['repo_name'])
             if obj:
                 scope['repo_id'] = obj.repo_id
         _scope = {
             'repo_id': -1,
             'user_group_id': -1,
             'repo_group_id': -1,
         }
         _scope.update(scope)
         cache_key = "_".join(map(safe_str, reduce(lambda a, b: a+b,
                                                   _scope.items())))
         if cache_key not in self._permissions_scoped_cache:
             # store in cache to mimic how the @LazyProperty works,
             # the difference here is that we use the unique key calculated
             # from params and values
             res = self.get_perms(user=self, cache=False, scope=_scope)
             self._permissions_scoped_cache[cache_key] = res
         return self._permissions_scoped_cache[cache_key]
 
     def get_instance(self):
         return User.get(self.user_id)
 
     def update_lastactivity(self):
         if self.user_id:
             User.get(self.user_id).update_lastactivity()
 
     def propagate_data(self):
         """
         Fills in user data and propagates values to this instance. Maps fetched
         user attributes to this class instance attributes
         """
         log.debug('AuthUser: starting data propagation for new potential user')
         user_model = UserModel()
         anon_user = 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 != anon_user.user_id:
             log.debug('Trying 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 != anon_user.api_key:
             log.debug('Trying 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('Trying 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:
             log.debug(
                 'Failed to load user. Fallback to default user %s', anon_user)
             # if we cannot authenticate user try anonymous
             if anon_user.active:
                 log.debug('default user is active, using it as a session user')
                 user_model.fill_data(self, user_id=anon_user.user_id)
                 # then we set this user is logged in
                 self.is_authenticated = True
             else:
                 log.debug('default user is NOT active')
                 # in case of disabled anonymous user we reset some of the
                 # parameters so such user is "corrupted", skipping the fill_data
                 for attr in ['user_id', 'username', 'admin', 'active']:
                     setattr(self, attr, None)
                 self.is_authenticated = False
 
         if not self.username:
             self.username = 'None'
 
         log.debug('AuthUser: propagated user is now %s', self)
 
     def get_perms(self, user, scope=None, explicit=True, algo='higherwin',
                   calculate_super_admin=False, 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 defiine 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
 
         # inheritance of global permissions like create repo/fork repo etc
         user_inherit_default_permissions = user.inherit_default_permissions
 
         log.debug('Computing PERMISSION tree for scope %s' % (scope, ))
         compute = caches.conditional_cache(
             'short_term', 'cache_desc',
             condition=cache, func=_cached_perms_data)
         result = compute(user_id, scope, user_is_admin,
                          user_inherit_default_permissions, explicit, algo,
                          calculate_super_admin)
 
         result_repr = []
         for k in result:
             result_repr.append((k, len(result[k])))
 
         log.debug('PERMISSION tree computed %s' % (result_repr,))
         return result
 
     @property
     def is_default(self):
         return self.username == User.DEFAULT_USER
 
     @property
     def is_admin(self):
         return self.admin
 
     @property
     def is_user_object(self):
         return self.user_id is not None
 
     @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']
 
     def repo_acl_ids(self, perms=None, name_filter=None, cache=False):
         """
         Returns list of repository ids that user have access to based on given
         perms. The cache flag should be only used in cases that are used for
         display purposes, NOT IN ANY CASE for permission checks.
         """
         from rhodecode.model.scm import RepoList
         if not perms:
             perms = [
                 'repository.read', 'repository.write', 'repository.admin']
 
         def _cached_repo_acl(user_id, perm_def, name_filter):
             qry = Repository.query()
             if name_filter:
                 ilike_expression = u'%{}%'.format(safe_unicode(name_filter))
                 qry = qry.filter(
                     Repository.repo_name.ilike(ilike_expression))
 
             return [x.repo_id for x in
                     RepoList(qry, perm_set=perm_def)]
 
         compute = caches.conditional_cache(
             'long_term', 'repo_acl_ids',
             condition=cache, func=_cached_repo_acl)
         return compute(self.user_id, perms, name_filter)
 
     def repo_group_acl_ids(self, perms=None, name_filter=None, cache=False):
         """
         Returns list of repository group ids that user have access to based on given
         perms. The cache flag should be only used in cases that are used for
         display purposes, NOT IN ANY CASE for permission checks.
         """
         from rhodecode.model.scm import RepoGroupList
         if not perms:
             perms = [
                 'group.read', 'group.write', 'group.admin']
 
         def _cached_repo_group_acl(user_id, perm_def, name_filter):
             qry = RepoGroup.query()
             if name_filter:
                 ilike_expression = u'%{}%'.format(safe_unicode(name_filter))
                 qry = qry.filter(
                     RepoGroup.group_name.ilike(ilike_expression))
 
             return [x.group_id for x in
                     RepoGroupList(qry, perm_set=perm_def)]
 
         compute = caches.conditional_cache(
             'long_term', 'repo_group_acl_ids',
             condition=cache, func=_cached_repo_group_acl)
         return compute(self.user_id, perms, name_filter)
 
     def user_group_acl_ids(self, perms=None, name_filter=None, cache=False):
         """
         Returns list of user group ids that user have access to based on given
         perms. The cache flag should be only used in cases that are used for
         display purposes, NOT IN ANY CASE for permission checks.
         """
         from rhodecode.model.scm import UserGroupList
         if not perms:
             perms = [
                 'usergroup.read', 'usergroup.write', 'usergroup.admin']
 
         def _cached_user_group_acl(user_id, perm_def, name_filter):
             qry = UserGroup.query()
             if name_filter:
                 ilike_expression = u'%{}%'.format(safe_unicode(name_filter))
                 qry = qry.filter(
                     UserGroup.users_group_name.ilike(ilike_expression))
 
             return [x.users_group_id for x in
                     UserGroupList(qry, perm_set=perm_def)]
 
         compute = caches.conditional_cache(
             'long_term', 'user_group_acl_ids',
             condition=cache, func=_cached_user_group_acl)
         return compute(self.user_id, perms, name_filter)
 
     @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)
     @property
     def personal_repo_group(self):
         return RepoGroup.get_user_personal_repo_group(self.user_id)
 
     @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,
-            'password': md5(self.password),
+            'password': md5(self.password or ''),
             '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(settings):
     """
     This function will propagate pyramid settings 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 settings: current pyramid registry.settings
 
     """
     log.debug('auth: getting information about all available permissions')
     try:
         sa = meta.Session
         all_perms = sa.query(Permission).all()
         settings.setdefault('available_permissions',
                             [x.permission_name for x in all_perms])
         log.debug('auth: set available permissions')
     except Exception:
         log.exception('Failed to fetch permissions from the database.')
         raise
 
 
 def get_csrf_token(session, force_new=False, save_if_missing=True):
     """
     Return the current authentication token, creating one if one doesn't
     already exist and the save_if_missing flag is present.
 
     :param session: pass in the pylons session, else we use the global ones
     :param force_new: force to re-generate the token and store it in session
     :param save_if_missing: save the newly generated token if it's missing in
         session
     """
     # NOTE(marcink): probably should be replaced with below one from pyramid 1.9
     # from pyramid.csrf import get_csrf_token
 
     if (csrf_token_key not in session and save_if_missing) or force_new:
         token = hashlib.sha1(str(random.getrandbits(128))).hexdigest()
         session[csrf_token_key] = token
         if hasattr(session, 'save'):
             session.save()
     return session.get(csrf_token_key)
 
 
 def get_request(perm_class_instance):
     from pyramid.threadlocal import get_current_request
     pyramid_request = get_current_request()
     if not pyramid_request:
         # return global request of pylons in case pyramid isn't available
         # NOTE(marcink): this should be removed after migration to pyramid
         from pylons import request
         return request
     return pyramid_request
 
 
 # CHECK DECORATORS
 class CSRFRequired(object):
     """
     Decorator for authenticating a form
 
     This decorator uses an authorization token stored in the client's
     session for prevention of certain Cross-site request forgery (CSRF)
     attacks (See
     http://en.wikipedia.org/wiki/Cross-site_request_forgery for more
     information).
 
     For use with the ``webhelpers.secure_form`` helper functions.
 
     """
     def __init__(self, token=csrf_token_key, header='X-CSRF-Token',
         except_methods=None):
         self.token = token
         self.header = header
         self.except_methods = except_methods or []
 
     def __call__(self, func):
         return get_cython_compat_decorator(self.__wrapper, func)
 
     def _get_csrf(self, _request):
         return _request.POST.get(self.token, _request.headers.get(self.header))
 
     def check_csrf(self, _request, cur_token):
         supplied_token = self._get_csrf(_request)
         return supplied_token and supplied_token == cur_token
 
     def _get_request(self):
         return get_request(self)
 
     def __wrapper(self, func, *fargs, **fkwargs):
         request = self._get_request()
 
         if request.method in self.except_methods:
             return func(*fargs, **fkwargs)
 
         cur_token = get_csrf_token(request.session, save_if_missing=False)
         if self.check_csrf(request, cur_token):
             if request.POST.get(self.token):
                 del request.POST[self.token]
             return func(*fargs, **fkwargs)
         else:
             reason = 'token-missing'
             supplied_token = self._get_csrf(request)
             if supplied_token and cur_token != supplied_token:
                 reason = 'token-mismatch [%s:%s]' % (
                     cur_token or ''[:6], supplied_token or ''[:6])
 
             csrf_message = \
                 ("Cross-site request forgery detected, request denied. See "
                  "http://en.wikipedia.org/wiki/Cross-site_request_forgery for "
                  "more information.")
         log.warn('Cross-site request forgery detected, request %r DENIED: %s '
                  'REMOTE_ADDR:%s, HEADERS:%s' % (
                      request, reason, request.remote_addr, request.headers))
 
         raise HTTPForbidden(explanation=csrf_message)
 
 
 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, auth_token_access=None):
         self.auth_token_access = auth_token_access
 
     def __call__(self, func):
         return get_cython_compat_decorator(self.__wrapper, func)
 
     def _get_request(self):
         return get_request(self)
 
     def __wrapper(self, func, *fargs, **fkwargs):
         from rhodecode.lib import helpers as h
         cls = fargs[0]
         user = cls._rhodecode_user
         request = self._get_request()
 
         loc = "%s:%s" % (cls.__class__.__name__, func.__name__)
         log.debug('Starting login restriction checks for user: %s' % (user,))
         # check if our IP is allowed
         ip_access_valid = True
         if not user.ip_allowed:
             h.flash(h.literal(_('IP %s not allowed' % (user.ip_addr,))),
                     category='warning')
             ip_access_valid = False
 
         # check if we used an APIKEY and it's a valid one
         # defined white-list of controllers which API access will be enabled
         _auth_token = request.GET.get(
             'auth_token', '') or request.GET.get('api_key', '')
         auth_token_access_valid = allowed_auth_token_access(
             loc, auth_token=_auth_token)
 
         # explicit controller is enabled or API is in our whitelist
         if self.auth_token_access or auth_token_access_valid:
             log.debug('Checking AUTH TOKEN access for %s' % (cls,))
             db_user = user.get_instance()
 
             if db_user:
                 if self.auth_token_access:
                     roles = self.auth_token_access
                 else:
                     roles = [UserApiKeys.ROLE_HTTP]
                 token_match = db_user.authenticate_by_token(
                     _auth_token, roles=roles)
             else:
                 log.debug('Unable to fetch db instance for auth user: %s', user)
                 token_match = False
 
             if _auth_token and token_match:
                 auth_token_access_valid = True
                 log.debug('AUTH TOKEN ****%s is VALID' % (_auth_token[-4:],))
             else:
                 auth_token_access_valid = False
                 if not _auth_token:
                     log.debug("AUTH TOKEN *NOT* present in request")
                 else:
                     log.warning(
                         "AUTH TOKEN ****%s *NOT* valid" % _auth_token[-4:])
 
         log.debug('Checking if %s is authenticated @ %s' % (user.username, loc))
         reason = 'RHODECODE_AUTH' if user.is_authenticated \
             else 'AUTH_TOKEN_AUTH'
 
         if ip_access_valid and (
                 user.is_authenticated or auth_token_access_valid):
             log.info(
                 'user %s authenticating with:%s IS authenticated on func %s'
                 % (user, reason, loc))
 
             # update user data to check last activity
             user.update_lastactivity()
             Session().commit()
             return func(*fargs, **fkwargs)
         else:
             log.warning(
                 'user %s authenticating with:%s NOT authenticated on '
                 'func: %s: IP_ACCESS:%s AUTH_TOKEN_ACCESS:%s'
                 % (user, reason, loc, ip_access_valid,
                    auth_token_access_valid))
             # we preserve the get PARAM
             came_from = get_came_from(request)
 
             log.debug('redirecting to login page with %s' % (came_from,))
             raise HTTPFound(
                 h.route_path('login', _query={'came_from': came_from}))
 
 
 class NotAnonymous(object):
     """
     Must be logged in to execute this function else
     redirect to login page
     """
 
     def __call__(self, func):
         return get_cython_compat_decorator(self.__wrapper, func)
 
     def _get_request(self):
         return get_request(self)
 
     def __wrapper(self, func, *fargs, **fkwargs):
         import rhodecode.lib.helpers as h
         cls = fargs[0]
         self.user = cls._rhodecode_user
         request = self._get_request()
 
         log.debug('Checking if user is not anonymous @%s' % cls)
 
         anonymous = self.user.username == User.DEFAULT_USER
 
         if anonymous:
             came_from = get_came_from(request)
             h.flash(_('You need to be a registered user to '
                       'perform this action'),
                     category='warning')
             raise HTTPFound(
                 h.route_path('login', _query={'came_from': came_from}))
         else:
             return func(*fargs, **fkwargs)
 
 
 class PermsDecorator(object):
     """
     Base class for controller decorators, we extract the current user from
     the class itself, which has it stored in base controllers
     """
 
     def __init__(self, *required_perms):
         self.required_perms = set(required_perms)
 
     def __call__(self, func):
         return get_cython_compat_decorator(self.__wrapper, func)
 
     def _get_request(self):
         return get_request(self)
 
     def __wrapper(self, func, *fargs, **fkwargs):
         import rhodecode.lib.helpers as h
         cls = fargs[0]
         _user = cls._rhodecode_user
 
         log.debug('checking %s permissions %s for %s %s',
                   self.__class__.__name__, self.required_perms, cls, _user)
 
         if self.check_permissions(_user):
             log.debug('Permission granted for %s %s', cls, _user)
             return func(*fargs, **fkwargs)
 
         else:
             log.debug('Permission denied for %s %s', cls, _user)
             anonymous = _user.username == User.DEFAULT_USER
 
             if anonymous:
                 came_from = get_came_from(self._get_request())
                 h.flash(_('You need to be signed in to view this page'),
                         category='warning')
                 raise HTTPFound(
                     h.route_path('login', _query={'came_from': came_from}))
 
             else:
                 # redirect with 404 to prevent resource discovery
                 raise HTTPNotFound()
 
     def check_permissions(self, user):
         """Dummy function for overriding"""
         raise NotImplementedError(
             '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, user):
         perms = user.permissions_with_scope({})
         if self.required_perms.issubset(perms['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, user):
         perms = user.permissions_with_scope({})
         if self.required_perms.intersection(perms['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 _get_repo_name(self):
         _request = self._get_request()
         return get_repo_slug(_request)
 
     def check_permissions(self, user):
         perms = user.permissions
         repo_name = self._get_repo_name()
 
         try:
             user_perms = set([perms['repositories'][repo_name]])
         except KeyError:
             log.debug('cannot locate repo with name: `%s` in permissions defs',
                       repo_name)
             return False
 
         log.debug('checking `%s` permissions for repo `%s`',
                   user_perms, repo_name)
         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 _get_repo_name(self):
         _request = self._get_request()
         return get_repo_slug(_request)
 
     def check_permissions(self, user):
         perms = user.permissions
         repo_name = self._get_repo_name()
 
         try:
             user_perms = set([perms['repositories'][repo_name]])
         except KeyError:
             log.debug(
                 'cannot locate repo with name: `%s` in permissions defs',
                 repo_name)
             return False
 
         log.debug('checking `%s` permissions for repo `%s`',
                   user_perms, repo_name)
         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 _get_repo_group_name(self):
         _request = self._get_request()
         return get_repo_group_slug(_request)
 
     def check_permissions(self, user):
         perms = user.permissions
         group_name = self._get_repo_group_name()
         try:
             user_perms = set([perms['repositories_groups'][group_name]])
         except KeyError:
             log.debug(
                 'cannot locate repo group with name: `%s` in permissions defs',
                 group_name)
             return False
 
         log.debug('checking `%s` permissions for repo group `%s`',
                   user_perms, group_name)
         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 met
     """
     def _get_repo_group_name(self):
         _request = self._get_request()
         return get_repo_group_slug(_request)
 
     def check_permissions(self, user):
         perms = user.permissions
         group_name = self._get_repo_group_name()
 
         try:
             user_perms = set([perms['repositories_groups'][group_name]])
         except KeyError:
             log.debug(
                 'cannot locate repo group with name: `%s` in permissions defs',
                 group_name)
             return False
 
         log.debug('checking `%s` permissions for repo group `%s`',
                   user_perms, group_name)
         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 _get_user_group_name(self):
         _request = self._get_request()
         return get_user_group_slug(_request)
 
     def check_permissions(self, user):
         perms = user.permissions
         group_name = self._get_user_group_name()
         try:
             user_perms = set([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 _get_user_group_name(self):
         _request = self._get_request()
         return get_user_group_slug(_request)
 
     def check_permissions(self, user):
         perms = user.permissions
         group_name = self._get_user_group_name()
         try:
             user_perms = set([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.repo_name = None
         self.repo_group_name = None
         self.user_group_name = None
 
     def __bool__(self):
         frame = inspect.currentframe()
         stack_trace = traceback.format_stack(frame)
         log.error('Checking bool value on a class instance of perm '
                   'function is not allowed: %s' % ''.join(stack_trace))
         # rather than throwing errors, here we always return False so if by
         # accident someone checks truth for just an instance it will always end
         # up in returning False
         return False
     __nonzero__ = __bool__
 
     def __call__(self, check_location='', user=None):
         if not user:
             log.debug('Using user attribute from global request')
             # TODO: remove this someday,put as user as attribute here
             request = self._get_request()
             user = request.user
 
         # init auth user if not already given
         if not isinstance(user, AuthUser):
             log.debug('Wrapping user %s into AuthUser', user)
             user = AuthUser(user.user_id)
 
         cls_name = self.__class__.__name__
         check_scope = self._get_check_scope(cls_name)
         check_location = check_location or 'unspecified location'
 
         log.debug('checking cls:%s %s usr:%s %s @ %s', cls_name,
                   self.required_perms, user, check_scope, check_location)
         if not user:
             log.warning('Empty user given for permission check')
             return False
 
         if self.check_permissions(user):
             log.debug('Permission to repo:`%s` GRANTED for user:`%s` @ %s',
                       check_scope, user, check_location)
             return True
 
         else:
             log.debug('Permission to repo:`%s` DENIED for user:`%s` @ %s',
                       check_scope, user, check_location)
             return False
 
     def _get_request(self):
         return get_request(self)
 
     def _get_check_scope(self, cls_name):
         return {
             'HasPermissionAll':          'GLOBAL',
             'HasPermissionAny':          'GLOBAL',
             'HasRepoPermissionAll':      'repo:%s' % self.repo_name,
             'HasRepoPermissionAny':      'repo:%s' % self.repo_name,
             'HasRepoGroupPermissionAll': 'repo_group:%s' % self.repo_group_name,
             'HasRepoGroupPermissionAny': 'repo_group:%s' % self.repo_group_name,
             'HasUserGroupPermissionAll': 'user_group:%s' % self.user_group_name,
             'HasUserGroupPermissionAny': 'user_group:%s' % self.user_group_name,
         }.get(cls_name, '?:%s' % cls_name)
 
     def check_permissions(self, user):
         """Dummy function for overriding"""
         raise Exception('You have to write this function in child class')
 
 
 class HasPermissionAll(PermsFunction):
     def check_permissions(self, user):
         perms = user.permissions_with_scope({})
         if self.required_perms.issubset(perms.get('global')):
             return True
         return False
 
 
 class HasPermissionAny(PermsFunction):
     def check_permissions(self, user):
         perms = user.permissions_with_scope({})
         if self.required_perms.intersection(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 _get_repo_name(self):
         if not self.repo_name:
             _request = self._get_request()
             self.repo_name = get_repo_slug(_request)
         return self.repo_name
 
     def check_permissions(self, user):
         self.repo_name = self._get_repo_name()
         perms = user.permissions
         try:
             user_perms = set([perms['repositories'][self.repo_name]])
         except KeyError:
             return False
         if self.required_perms.issubset(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 _get_repo_name(self):
         if not self.repo_name:
             _request = self._get_request()
             self.repo_name = get_repo_slug(_request)
         return self.repo_name
 
     def check_permissions(self, user):
         self.repo_name = self._get_repo_name()
         perms = user.permissions
         try:
             user_perms = set([perms['repositories'][self.repo_name]])
         except KeyError:
             return False
         if self.required_perms.intersection(user_perms):
             return True
         return False
 
 
 class HasRepoGroupPermissionAny(PermsFunction):
     def __call__(self, group_name=None, check_location='', user=None):
         self.repo_group_name = group_name
         return super(HasRepoGroupPermissionAny, self).__call__(
             check_location, user)
 
     def check_permissions(self, user):
         perms = user.permissions
         try:
             user_perms = set(
                 [perms['repositories_groups'][self.repo_group_name]])
         except KeyError:
             return False
         if self.required_perms.intersection(user_perms):
             return True
         return False
 
 
 class HasRepoGroupPermissionAll(PermsFunction):
     def __call__(self, group_name=None, check_location='', user=None):
         self.repo_group_name = group_name
         return super(HasRepoGroupPermissionAll, self).__call__(
             check_location, user)
 
     def check_permissions(self, user):
         perms = user.permissions
         try:
             user_perms = set(
                 [perms['repositories_groups'][self.repo_group_name]])
         except KeyError:
             return False
         if self.required_perms.issubset(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, user):
         perms = user.permissions
         try:
             user_perms = set([perms['user_groups'][self.user_group_name]])
         except KeyError:
             return False
         if self.required_perms.intersection(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, user):
         perms = user.permissions
         try:
             user_perms = set([perms['user_groups'][self.user_group_name]])
         except KeyError:
             return False
         if self.required_perms.issubset(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)
         user = AuthUser(user.user_id)
         log.debug(
             'Checking VCS protocol permissions %s for user:%s repo:`%s`',
             self.required_perms, user, repo_name)
 
         if self.check_permissions(user, repo_name):
             log.debug('Permission to repo:`%s` GRANTED for user:%s @ %s',
                       repo_name, user, 'PermissionMiddleware')
             return True
 
         else:
             log.debug('Permission to repo:`%s` DENIED for user:%s @ %s',
                       repo_name, user, 'PermissionMiddleware')
             return False
 
     def check_permissions(self, user, repo_name):
         perms = user.permissions_with_scope({'repo_name': repo_name})
 
         try:
             user_perms = set([perms['repositories'][repo_name]])
         except Exception:
             log.exception('Error while accessing user permissions')
             return False
 
         if self.required_perms.intersection(user_perms):
             return True
         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, user_group_name=None):
         cls_name = self.__class__.__name__
         check_scope = 'global:%s' % (self.required_perms,)
         if repo_name:
             check_scope += ', repo_name:%s' % (repo_name,)
 
         if group_name:
             check_scope += ', repo_group_name:%s' % (group_name,)
 
         if user_group_name:
             check_scope += ', user_group_name:%s' % (user_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,
                                   user_group_name):
             log.debug('Permission to repo:`%s` GRANTED for user:`%s` @ %s',
                       check_scope, user, check_location)
             return True
 
         else:
             log.debug('Permission to repo:`%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,
                           user_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,
                           user_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,
                           user_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,
                           user_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,
                           user_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,
                           user_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,
                           user_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
 
 
 class HasUserGroupPermissionAnyApi(_BaseApiPerm):
     def check_permissions(self, perm_defs, repo_name=None, group_name=None,
                           user_group_name=None):
         try:
             _user_perms = set([perm_defs['user_groups'][user_group_name]])
         except KeyError:
             log.warning(traceback.format_exc())
             return False
         if self.required_perms.intersection(_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
     """
     log.debug('checking if ip:%s is subnet of %s' % (source_ip, allowed_ips))
     source_ip_address = ipaddress.ip_address(safe_unicode(source_ip))
     if isinstance(allowed_ips, (tuple, list, set)):
         for ip in allowed_ips:
             ip = safe_unicode(ip)
             try:
                 network_address = ipaddress.ip_network(ip, strict=False)
                 if source_ip_address in network_address:
                     log.debug('IP %s is network %s' %
                               (source_ip_address, network_address))
                     return True
                 # for any case we cannot determine the IP, don't crash just
                 # skip it and log as error, we want to say forbidden still when
                 # sending bad IP
             except Exception:
                 log.error(traceback.format_exc())
                 continue
     return False
 
 
 def get_cython_compat_decorator(wrapper, func):
     """
     Creates a cython compatible decorator. The previously used
     decorator.decorator() function seems to be incompatible with cython.
 
     :param wrapper: __wrapper method of the decorator class
     :param func: decorated function
     """
     @wraps(func)
     def local_wrapper(*args, **kwds):
         return wrapper(func, *args, **kwds)
     local_wrapper.__wrapped__ = func
     return local_wrapper