Merge pull request #1628 from matrix-org/erikj/ldap_split_out

Use external ldap auth pacakge

1 files changed, 0 insertions, 369 deletions

diff --git a/synapse/util/ldap_auth_provider.py b/synapse/util/ldap_auth_provider.py
deleted file mode 100644
index 1b989248fb..0000000000
--- a/synapse/util/ldap_auth_provider.py
+++ /dev/null
@@ -1,369 +0,0 @@
-
-from twisted.internet import defer
-
-from synapse.config._base import ConfigError
-from synapse.types import UserID
-
-import ldap3
-import ldap3.core.exceptions
-
-import logging
-
-try:
-    import ldap3
-    import ldap3.core.exceptions
-except ImportError:
-    ldap3 = None
-    pass
-
-
-logger = logging.getLogger(__name__)
-
-
-class LDAPMode(object):
-    SIMPLE = "simple",
-    SEARCH = "search",
-
-    LIST = (SIMPLE, SEARCH)
-
-
-class LdapAuthProvider(object):
-    __version__ = "0.1"
-
-    def __init__(self, config, account_handler):
-        self.account_handler = account_handler
-
-        if not ldap3:
-            raise RuntimeError(
-                'Missing ldap3 library. This is required for LDAP Authentication.'
-            )
-
-        self.ldap_mode = config.mode
-        self.ldap_uri = config.uri
-        self.ldap_start_tls = config.start_tls
-        self.ldap_base = config.base
-        self.ldap_attributes = config.attributes
-        if self.ldap_mode == LDAPMode.SEARCH:
-            self.ldap_bind_dn = config.bind_dn
-            self.ldap_bind_password = config.bind_password
-            self.ldap_filter = config.filter
-
-    @defer.inlineCallbacks
-    def check_password(self, user_id, password):
-        """ Attempt to authenticate a user against an LDAP Server
-            and register an account if none exists.
-
-            Returns:
-                True if authentication against LDAP was successful
-        """
-        localpart = UserID.from_string(user_id).localpart
-
-        try:
-            server = ldap3.Server(self.ldap_uri)
-            logger.debug(
-                "Attempting LDAP connection with %s",
-                self.ldap_uri
-            )
-
-            if self.ldap_mode == LDAPMode.SIMPLE:
-                result, conn = self._ldap_simple_bind(
-                    server=server, localpart=localpart, password=password
-                )
-                logger.debug(
-                    'LDAP authentication method simple bind returned: %s (conn: %s)',
-                    result,
-                    conn
-                )
-                if not result:
-                    defer.returnValue(False)
-            elif self.ldap_mode == LDAPMode.SEARCH:
-                result, conn = self._ldap_authenticated_search(
-                    server=server, localpart=localpart, password=password
-                )
-                logger.debug(
-                    'LDAP auth method authenticated search returned: %s (conn: %s)',
-                    result,
-                    conn
-                )
-                if not result:
-                    defer.returnValue(False)
-            else:
-                raise RuntimeError(
-                    'Invalid LDAP mode specified: {mode}'.format(
-                        mode=self.ldap_mode
-                    )
-                )
-
-            try:
-                logger.info(
-                    "User authenticated against LDAP server: %s",
-                    conn
-                )
-            except NameError:
-                logger.warn(
-                    "Authentication method yielded no LDAP connection, aborting!"
-                )
-                defer.returnValue(False)
-
-            # check if user with user_id exists
-            if (yield self.account_handler.check_user_exists(user_id)):
-                # exists, authentication complete
-                conn.unbind()
-                defer.returnValue(True)
-
-            else:
-                # does not exist, fetch metadata for account creation from
-                # existing ldap connection
-                query = "({prop}={value})".format(
-                    prop=self.ldap_attributes['uid'],
-                    value=localpart
-                )
-
-                if self.ldap_mode == LDAPMode.SEARCH and self.ldap_filter:
-                    query = "(&{filter}{user_filter})".format(
-                        filter=query,
-                        user_filter=self.ldap_filter
-                    )
-                logger.debug(
-                    "ldap registration filter: %s",
-                    query
-                )
-
-                conn.search(
-                    search_base=self.ldap_base,
-                    search_filter=query,
-                    attributes=[
-                        self.ldap_attributes['name'],
-                        self.ldap_attributes['mail']
-                    ]
-                )
-
-                if len(conn.response) == 1:
-                    attrs = conn.response[0]['attributes']
-                    mail = attrs[self.ldap_attributes['mail']][0]
-                    name = attrs[self.ldap_attributes['name']][0]
-
-                    # create account
-                    user_id, access_token = (
-                        yield self.account_handler.register(localpart=localpart)
-                    )
-
-                    # TODO: bind email, set displayname with data from ldap directory
-
-                    logger.info(
-                        "Registration based on LDAP data was successful: %d: %s (%s, %)",
-                        user_id,
-                        localpart,
-                        name,
-                        mail
-                    )
-
-                    defer.returnValue(True)
-                else:
-                    if len(conn.response) == 0:
-                        logger.warn("LDAP registration failed, no result.")
-                    else:
-                        logger.warn(
-                            "LDAP registration failed, too many results (%s)",
-                            len(conn.response)
-                        )
-
-                    defer.returnValue(False)
-
-            defer.returnValue(False)
-
-        except ldap3.core.exceptions.LDAPException as e:
-            logger.warn("Error during ldap authentication: %s", e)
-            defer.returnValue(False)
-
-    @staticmethod
-    def parse_config(config):
-        class _LdapConfig(object):
-            pass
-
-        ldap_config = _LdapConfig()
-
-        ldap_config.enabled = config.get("enabled", False)
-
-        ldap_config.mode = LDAPMode.SIMPLE
-
-        # verify config sanity
-        _require_keys(config, [
-            "uri",
-            "base",
-            "attributes",
-        ])
-
-        ldap_config.uri = config["uri"]
-        ldap_config.start_tls = config.get("start_tls", False)
-        ldap_config.base = config["base"]
-        ldap_config.attributes = config["attributes"]
-
-        if "bind_dn" in config:
-            ldap_config.mode = LDAPMode.SEARCH
-            _require_keys(config, [
-                "bind_dn",
-                "bind_password",
-            ])
-
-            ldap_config.bind_dn = config["bind_dn"]
-            ldap_config.bind_password = config["bind_password"]
-            ldap_config.filter = config.get("filter", None)
-
-        # verify attribute lookup
-        _require_keys(config['attributes'], [
-            "uid",
-            "name",
-            "mail",
-        ])
-
-        return ldap_config
-
-    def _ldap_simple_bind(self, server, localpart, password):
-        """ Attempt a simple bind with the credentials
-            given by the user against the LDAP server.
-
-            Returns True, LDAP3Connection
-                if the bind was successful
-            Returns False, None
-                if an error occured
-        """
-
-        try:
-            # bind with the the local users ldap credentials
-            bind_dn = "{prop}={value},{base}".format(
-                prop=self.ldap_attributes['uid'],
-                value=localpart,
-                base=self.ldap_base
-            )
-            conn = ldap3.Connection(server, bind_dn, password,
-                                    authentication=ldap3.AUTH_SIMPLE)
-            logger.debug(
-                "Established LDAP connection in simple bind mode: %s",
-                conn
-            )
-
-            if self.ldap_start_tls:
-                conn.start_tls()
-                logger.debug(
-                    "Upgraded LDAP connection in simple bind mode through StartTLS: %s",
-                    conn
-                )
-
-            if conn.bind():
-                # GOOD: bind okay
-                logger.debug("LDAP Bind successful in simple bind mode.")
-                return True, conn
-
-            # BAD: bind failed
-            logger.info(
-                "Binding against LDAP failed for '%s' failed: %s",
-                localpart, conn.result['description']
-            )
-            conn.unbind()
-            return False, None
-
-        except ldap3.core.exceptions.LDAPException as e:
-            logger.warn("Error during LDAP authentication: %s", e)
-            return False, None
-
-    def _ldap_authenticated_search(self, server, localpart, password):
-        """ Attempt to login with the preconfigured bind_dn
-            and then continue searching and filtering within
-            the base_dn
-
-            Returns (True, LDAP3Connection)
-                if a single matching DN within the base was found
-                that matched the filter expression, and with which
-                a successful bind was achieved
-
-                The LDAP3Connection returned is the instance that was used to
-                verify the password not the one using the configured bind_dn.
-            Returns (False, None)
-                if an error occured
-        """
-
-        try:
-            conn = ldap3.Connection(
-                server,
-                self.ldap_bind_dn,
-                self.ldap_bind_password
-            )
-            logger.debug(
-                "Established LDAP connection in search mode: %s",
-                conn
-            )
-
-            if self.ldap_start_tls:
-                conn.start_tls()
-                logger.debug(
-                    "Upgraded LDAP connection in search mode through StartTLS: %s",
-                    conn
-                )
-
-            if not conn.bind():
-                logger.warn(
-                    "Binding against LDAP with `bind_dn` failed: %s",
-                    conn.result['description']
-                )
-                conn.unbind()
-                return False, None
-
-            # construct search_filter like (uid=localpart)
-            query = "({prop}={value})".format(
-                prop=self.ldap_attributes['uid'],
-                value=localpart
-            )
-            if self.ldap_filter:
-                # combine with the AND expression
-                query = "(&{query}{filter})".format(
-                    query=query,
-                    filter=self.ldap_filter
-                )
-            logger.debug(
-                "LDAP search filter: %s",
-                query
-            )
-            conn.search(
-                search_base=self.ldap_base,
-                search_filter=query
-            )
-
-            if len(conn.response) == 1:
-                # GOOD: found exactly one result
-                user_dn = conn.response[0]['dn']
-                logger.debug('LDAP search found dn: %s', user_dn)
-
-                # unbind and simple bind with user_dn to verify the password
-                # Note: do not use rebind(), for some reason it did not verify
-                #       the password for me!
-                conn.unbind()
-                return self._ldap_simple_bind(server, localpart, password)
-            else:
-                # BAD: found 0 or > 1 results, abort!
-                if len(conn.response) == 0:
-                    logger.info(
-                        "LDAP search returned no results for '%s'",
-                        localpart
-                    )
-                else:
-                    logger.info(
-                        "LDAP search returned too many (%s) results for '%s'",
-                        len(conn.response), localpart
-                    )
-                conn.unbind()
-                return False, None
-
-        except ldap3.core.exceptions.LDAPException as e:
-            logger.warn("Error during LDAP authentication: %s", e)
-            return False, None
-
-
-def _require_keys(config, required):
-    missing = [key for key in required if key not in config]
-    if missing:
-        raise ConfigError(
-            "LDAP enabled but missing required config values: {}".format(
-                ", ".join(missing)
-            )
-        )