if __platform__ in PLATFORM_WIN:

            return sha256(password).hexdigest() == hashed

        elif __platform__ in PLATFORM_OTHERS:

            return bcrypt.hashpw(password, hashed) == hashed

        else:

            raise Exception('Unknown or unsupported platform %s' \

                            % __platform__)

def get_crypt_password(password):

    return RhodeCodeCrypto.hash_string(password)

def check_password(password, hashed):

    return RhodeCodeCrypto.hash_check(password, hashed)

def generate_api_key(username, salt=None):

    if salt is None:

        salt = _RandomNameSequence().next()

    return hashlib.sha1(username + salt).hexdigest()

def authfunc(environ, username, password):

    """Dummy authentication function used in Mercurial/Git/ and access control,

    :param environ: needed only for using in Basic auth

    """

    return authenticate(username, password)

def authenticate(username, password):

    """Authentication function used for access control,

    firstly checks for db authentication then if ldap is enabled for ldap

    authentication, also creates ldap user if not in database

    :param username: username

    :param password: password

    """

    user_model = UserModel()

    user = user_model.get_by_username(username, cache=False)

    log.debug('Authenticating user using RhodeCode account')

    if user is not None and not user.ldap_dn:

        if user.active:

            if user.username == 'default' and user.active:

                log.info('user %s authenticated correctly as anonymous user',

                         username)

                return True

            elif user.username == username and check_password(password,

                                                              user.password):

                log.info('user %s authenticated correctly', username)

                return True

        else:

            log.warning('user %s is disabled', username)

    else:

        log.debug('Regular authentication failed')

        user_obj = user_model.get_by_username(username, cache=False,

                                            case_insensitive=True)

        if user_obj is not None and not user_obj.ldap_dn:

            log.debug('this user already exists as non ldap')

            return False

        from rhodecode.model.settings import SettingsModel

        ldap_settings = SettingsModel().get_ldap_settings()

        #======================================================================

        # FALLBACK TO LDAP AUTH IF ENABLE

        #======================================================================

        if str2bool(ldap_settings.get('ldap_active')):

            log.debug("Authenticating user using ldap")

            kwargs = {

                  'server': ldap_settings.get('ldap_host', ''),

                  'base_dn': ldap_settings.get('ldap_base_dn', ''),

                  'port': ldap_settings.get('ldap_port'),

                  'bind_dn': ldap_settings.get('ldap_dn_user'),

                  'bind_pass': ldap_settings.get('ldap_dn_pass'),

                  'use_ldaps': str2bool(ldap_settings.get('ldap_ldaps')),

                  'tls_reqcert': ldap_settings.get('ldap_tls_reqcert'),

                  'ldap_filter': ldap_settings.get('ldap_filter'),

                  'search_scope': ldap_settings.get('ldap_search_scope'),

                  'attr_login': ldap_settings.get('ldap_attr_login'),

                  'ldap_version': 3,

                  }

            log.debug('Checking for ldap authentication')

            try:

                aldap = AuthLdap(**kwargs)

                (user_dn, ldap_attrs) = aldap.authenticate_ldap(username,

                                                                password)

                log.debug('Got ldap DN response %s', user_dn)

                user_attrs = {

                    }

                if user_model.create_ldap(username, password, user_dn,

                                          user_attrs):

                    log.info('created new ldap user %s', username)

                return True

            except (LdapUsernameError, LdapPasswordError,):

                pass

            except (Exception,):

                log.error(traceback.format_exc())

                pass

    return False

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

    """

    def __init__(self, user_id=None, api_key=None):

        self.user_id = user_id

        self.api_key = None

        self.username = 'None'

        self.name = ''

        self.lastname = ''

        self.email = ''

        self.is_authenticated = False

        self.admin = False

        self.permissions = {}

        self._api_key = api_key

        self.propagate_data()

    def propagate_data(self):

        user_model = UserModel()

        self.anonymous_user = user_model.get_by_username('default', cache=True)

        if self._api_key and self._api_key != self.anonymous_user.api_key:

            #try go get user by api key

            log.debug('Auth User lookup by API KEY %s', self._api_key)

            user_model.fill_data(self, api_key=self._api_key)

        else:

            log.debug('Auth User lookup by USER ID %s', self.user_id)

            if self.user_id is not None \

                and self.user_id != self.anonymous_user.user_id:

                user_model.fill_data(self, user_id=self.user_id)

            else:

                if self.anonymous_user.active is True:

                    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.is_authenticated = False

        log.debug('Auth User is now %s', self)

        user_model.fill_perms(self)

    @property

    def is_admin(self):

        return self.admin

    def __repr__(self):

        return "<AuthUser('id:%s:%s|%s')>" % (self.user_id, self.username,

                                              self.is_authenticated)

    def set_authenticated(self, authenticated=True):

        if self.user_id != self.anonymous_user.user_id:

            self.is_authenticated = authenticated

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()

    except:

        pass

    finally:

        meta.Session.remove()

# 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/>.

"""

Created on Nov 17, 2010

@author: marcink

"""

from rhodecode.lib.exceptions import *

import logging

log = logging.getLogger(__name__)

try:

    import ldap

except ImportError:

    pass

class AuthLdap(object):

    def __init__(self, server, base_dn, port=389, bind_dn='', bind_pass='',

                 use_ldaps=False, tls_reqcert='DEMAND', ldap_version=3,

                 ldap_filter='(&(objectClass=user)(!(objectClass=computer)))',

                 search_scope='SUBTREE',

                 attr_login='uid'):

        self.ldap_version = ldap_version

        if use_ldaps:

            port = port or 689

        self.LDAP_USE_LDAPS = use_ldaps

        self.TLS_REQCERT = ldap.__dict__['OPT_X_TLS_' + tls_reqcert]

        self.LDAP_SERVER_ADDRESS = server

        self.LDAP_SERVER_PORT = port

        #USE FOR READ ONLY BIND TO LDAP SERVER

        self.LDAP_BIND_DN = bind_dn

        self.LDAP_BIND_PASS = bind_pass

        ldap_server_type = 'ldap'

        if self.LDAP_USE_LDAPS:ldap_server_type = ldap_server_type + 's'

        self.LDAP_SERVER = "%s://%s:%s" % (ldap_server_type,

                                               self.LDAP_SERVER_ADDRESS,

                                               self.LDAP_SERVER_PORT)

        self.BASE_DN = base_dn

        self.LDAP_FILTER = ldap_filter

        self.SEARCH_SCOPE = ldap.__dict__['SCOPE_' + search_scope]

        self.attr_login = attr_login

    def authenticate_ldap(self, username, password):

        """Authenticate a user via LDAP and return his/her LDAP properties.

        Raises AuthenticationError if the credentials are rejected, or

        EnvironmentError if the LDAP server can't be reached.

        :param username: username

        :param password: password

        """

        from rhodecode.lib.helpers import chop_at

        uid = chop_at(username, "@%s" % self.LDAP_SERVER_ADDRESS)

        if "," in username:

            raise LdapUsernameError("invalid character in username: ,")

        try:

            ldap.set_option(ldap.OPT_X_TLS_CACERTDIR, '/etc/openldap/cacerts')

            ldap.set_option(ldap.OPT_REFERRALS, ldap.OPT_OFF)

            ldap.set_option(ldap.OPT_RESTART, ldap.OPT_ON)

            ldap.set_option(ldap.OPT_TIMEOUT, 20)

            ldap.set_option(ldap.OPT_NETWORK_TIMEOUT, 10)

            ldap.set_option(ldap.OPT_TIMELIMIT, 15)

            if self.LDAP_USE_LDAPS:

                ldap.set_option(ldap.OPT_X_TLS_REQUIRE_CERT, self.TLS_REQCERT)

            server = ldap.initialize(self.LDAP_SERVER)

            if self.ldap_version == 2:

                server.protocol = ldap.VERSION2

            else:

                server.protocol = ldap.VERSION3

            if self.LDAP_BIND_DN and self.LDAP_BIND_PASS:

                server.simple_bind_s(self.LDAP_BIND_DN, self.LDAP_BIND_PASS)

            filt = '(&%s(%s=%s))' % (self.LDAP_FILTER, self.attr_login, username)

            log.debug("Authenticating %r filt %s at %s", self.BASE_DN,

                      filt, self.LDAP_SERVER)

            lobjects = server.search_ext_s(self.BASE_DN, self.SEARCH_SCOPE,

                                           filt)

            if not lobjects:

                raise ldap.NO_SUCH_OBJECT()

                try:

                    server.simple_bind_s(dn, password)

                    break

                except ldap.INVALID_CREDENTIALS, e:

                    log.debug("LDAP rejected password for user '%s' (%s): %s",

                              uid, username, dn)

            else:

                log.debug("No matching LDAP objects for authentication "

                          "of '%s' (%s)", uid, username)

                raise LdapPasswordError()

        except ldap.NO_SUCH_OBJECT, e:

            log.debug("LDAP says no such user '%s' (%s)", uid, username)

            raise LdapUsernameError()

        except ldap.SERVER_DOWN, e:

            raise LdapConnectionError("LDAP can't access authentication server")

        return (dn, attrs)