[auth_ldap] modify_role has to be called before the update to change it on the backend

* Allow configuring the password hash (SSHA, PBKDF2 or Argon2)
* Allow setting custom dn templates for users and groups to e.g. allow "ou=people" or "ou=user"
* Allow setting custom object class for entries
* Stop using deprecated openssl constants

flaschengeist/flaschengeist.toml

@@ -29,17 +29,16 @@ level = "WARNING"
 [auth_plain]
 enabled = true
 
-#[auth_ldap]
-# enabled = true
-# host =
-# port =
-# bind_dn =
-# base_dn =
-# secret =
-# use_ssl =
-# admin_dn =
-# admin_dn =
-# default_gid =
+[auth_ldap]
+# Full documentation https://flaschengeist.dev/Flaschengeist/flaschengeist/wiki/plugins_auth_ldap
+enabled = false
+# host = "localhost"
+# port = 389
+# base_dn = "dc=example,dc=com"
+# root_dn = "cn=Manager,dc=example,dc=com"
+# root_secret = "SuperS3cret"
+# Uncomment to use secured LDAP (ldaps)
+# use_ssl = true
 
 [MESSAGES]
 welcome_subject = "Welcome to Flaschengeist {name}"

flaschengeist/models/user.py

@@ -56,7 +56,7 @@ class User(db.Model, ModelSerializeMixin):
     display_name: str = db.Column(db.String(30))
     firstname: str = db.Column(db.String(50), nullable=False)
     lastname: str = db.Column(db.String(50), nullable=False)
-    mail: str = db.Column(db.String(60), nullable=False)
+    mail: str = db.Column(db.String(60))
     birthday: Optional[date] = db.Column(db.Date)
     roles: list[str] = []
     permissions: Optional[list[str]] = None

flaschengeist/plugins/auth_ldap/__init__.py

@@ -1,56 +1,61 @@
 """LDAP Authentication Provider Plugin"""
 import io
+import os
 import ssl
 from typing import Optional
 from flask_ldapconn import LDAPConn
 from flask import current_app as app
-from ldap3.utils.hashed import hashed
 from ldap3.core.exceptions import LDAPPasswordIsMandatoryError, LDAPBindError
-from ldap3 import SUBTREE, MODIFY_REPLACE, MODIFY_ADD, MODIFY_DELETE, HASHED_SALTED_MD5
+from ldap3 import SUBTREE, MODIFY_REPLACE, MODIFY_ADD, MODIFY_DELETE
 from werkzeug.exceptions import BadRequest, InternalServerError, NotFound
 
 from flaschengeist import logger
-from flaschengeist.plugins import AuthPlugin, after_role_updated
+from flaschengeist.plugins import AuthPlugin, before_role_updated
 from flaschengeist.models.user import User, Role, _Avatar
 import flaschengeist.controller.userController as userController
 
 
 class AuthLDAP(AuthPlugin):
-    def __init__(self, cfg):
+    def __init__(self, config):
         super().__init__()
-        config = {"port": 389, "use_ssl": False}
-        config.update(cfg)
         app.config.update(
-            LDAP_SERVER=config["host"],
-            LDAP_PORT=config["port"],
-            LDAP_BINDDN=config["bind_dn"],
+            LDAP_SERVER=config.get("host", "localhost"),
+            LDAP_PORT=config.get("port", 389),
+            LDAP_BINDDN=config.get("bind_dn", None),
+            LDAP_SECRET=config.get("secret", None),
+            LDAP_USE_SSL=config.get("use_ssl", False),
+            # That's not TLS, its dirty StartTLS on unencrypted LDAP
             LDAP_USE_TLS=False,
-            LDAP_USE_SSL=config["use_ssl"],
-            LDAP_TLS_VERSION=ssl.PROTOCOL_TLSv1_2,
-            LDAP_REQUIRE_CERT=ssl.CERT_NONE,
+            LDAP_TLS_VERSION=ssl.PROTOCOL_TLS,
             FORCE_ATTRIBUTE_VALUE_AS_LIST=True,
         )
-        if "secret" in config:
-            app.config["LDAP_SECRET"] = config["secret"]
+        logger.warning(app.config.get("LDAP_USE_SSL"))
+        if "ca_cert" in config:
+            app.config["LDAP_CA_CERTS_FILE"] = config["ca_cert"]
+        else:
+            # Default is CERT_REQUIRED
+            app.config["LDAP_REQUIRE_CERT"] = ssl.CERT_OPTIONAL
         self.ldap = LDAPConn(app)
-        self.dn = config["base_dn"]
-        self.default_gid = config["default_gid"]
+        self.base_dn = config["base_dn"]
+        self.search_dn = config.get("search_dn", "ou=people,{base_dn}").format(base_dn=self.base_dn)
+        self.group_dn = config.get("group_dn", "ou=group,{base_dn}").format(base_dn=self.base_dn)
+        self.password_hash = config.get("password_hash", "SSHA").upper()
+        self.object_classes = config.get("object_classes", ["inetOrgPerson"])
+        self.user_attributes: dict = config.get("user_attributes", {})
 
         # TODO: might not be set if modify is called
-        if "admin_dn" in config:
-            self.admin_dn = config["admin_dn"]
-            self.admin_secret = config["admin_secret"]
-        else:
-            self.admin_dn = None
+        self.root_dn = config.get("root_dn", None)
+        self.root_secret = config.get("root_secret", None)
 
-        @after_role_updated
+        @before_role_updated
         def _role_updated(role, new_name):
+            logger.debug(f"LDAP: before_role_updated called with ({role}, {new_name})")
             self.__modify_role(role, new_name)
 
     def login(self, user, password):
         if not user:
             return False
-        return self.ldap.authenticate(user.userid, password, "uid", self.dn)
+        return self.ldap.authenticate(user.userid, password, "uid", self.base_dn)
 
     def find_user(self, userid, mail=None):
         attr = self.__find(userid, mail)
@@ -64,42 +69,41 @@ class AuthLDAP(AuthPlugin):
         self.__update(user, attr)
 
     def create_user(self, user, password):
-        if self.admin_dn is None:
-            logger.error("admin_dn missing in ldap config!")
+        if self.root_dn is None:
+            logger.error("root_dn missing in ldap config!")
             raise InternalServerError
 
         try:
-            ldap_conn = self.ldap.connect(self.admin_dn, self.admin_secret)
+            ldap_conn = self.ldap.connect(self.root_dn, self.root_secret)
+            attributes = self.user_attributes.copy()
+            if "uidNumber" in attributes:
                 self.ldap.connection.search(
-                "ou=user,{}".format(self.dn),
+                    self.search_dn,
                     "(uidNumber=*)",
                     SUBTREE,
                     attributes=["uidNumber"],
                 )
-            uid_number = (
-                sorted(self.ldap.response(), key=lambda i: i["attributes"]["uidNumber"], reverse=True,)[0][
-                    "attributes"
-                ]["uidNumber"]
-                + 1
+                resp = sorted(
+                    self.ldap.response(),
+                    key=lambda i: i["attributes"]["uidNumber"],
+                    reverse=True,
                 )
-            dn = f"cn={user.firstname} {user.lastname},ou=user,{self.dn}"
-            object_class = [
-                "inetOrgPerson",
-                "posixAccount",
-                "person",
-                "organizationalPerson",
-            ]
-            attributes = {
-                "sn": user.firstname,
-                "givenName": user.lastname,
-                "gidNumber": self.default_gid,
-                "homeDirectory": f"/home/{user.userid}",
-                "loginShell": "/bin/bash",
+                attributes = resp[0]["attributes"]["uidNumber"] + 1 if resp else attributes["uidNumber"]
+            dn = self.dn_template.format(
+                firstname=user.firstname,
+                lastname=user.lastname,
+                userid=user.userid,
+                mail=user.mail,
+                display_name=user.display_name,
+                base_dn=self.base_dn,
+            )
+            attributes.update({
+                "sn": user.lastname,
+                "givenName": user.firstname,
                 "uid": user.userid,
-                "userPassword": hashed(HASHED_SALTED_MD5, password),
-                "uidNumber": uid_number,
-            }
-            ldap_conn.add(dn, object_class, attributes)
+                "userPassword": self.__hash(password),
+            })
+            ldap_conn.add(dn, self.object_classes, attributes)
             self._set_roles(user)
         except (LDAPPasswordIsMandatoryError, LDAPBindError):
             raise BadRequest
@@ -110,10 +114,10 @@ class AuthLDAP(AuthPlugin):
             if password:
                 ldap_conn = self.ldap.connect(dn, password)
             else:
-                if self.admin_dn is None:
-                    logger.error("admin_dn missing in ldap config!")
+                if self.root_dn is None:
+                    logger.error("root_dn missing in ldap config!")
                     raise InternalServerError
-                ldap_conn = self.ldap.connect(self.admin_dn, self.admin_secret)
+                ldap_conn = self.ldap.connect(self.root_dn, self.root_secret)
             modifier = {}
             for name, ldap_name in [
                 ("firstname", "givenName"),
@@ -124,9 +128,7 @@ class AuthLDAP(AuthPlugin):
                 if hasattr(user, name):
                     modifier[ldap_name] = [(MODIFY_REPLACE, [getattr(user, name)])]
             if new_password:
-                # TODO: Use secure hash!
-                salted_password = hashed(HASHED_SALTED_MD5, new_password)
-                modifier["userPassword"] = [(MODIFY_REPLACE, [salted_password])]
+                modifier["userPassword"] = [(MODIFY_REPLACE, [self.__hash(new_password)])]
             ldap_conn.modify(dn, modifier)
             self._set_roles(user)
         except (LDAPPasswordIsMandatoryError, LDAPBindError):
@@ -134,7 +136,7 @@ class AuthLDAP(AuthPlugin):
 
     def get_avatar(self, user):
         self.ldap.connection.search(
-            "ou=user,{}".format(self.dn),
+            self.search_dn,
             "(uid={})".format(user.userid),
             SUBTREE,
             attributes=["jpegPhoto"],
@@ -150,8 +152,8 @@ class AuthLDAP(AuthPlugin):
             raise NotFound
 
     def set_avatar(self, user, avatar: _Avatar):
-        if self.admin_dn is None:
-            logger.error("admin_dn missing in ldap config!")
+        if self.root_dn is None:
+            logger.error("root_dn missing in ldap config!")
             raise InternalServerError
 
         if avatar.mimetype != "image/jpeg":
@@ -172,16 +174,16 @@ class AuthLDAP(AuthPlugin):
                 raise BadRequest("Unsupported image format")
 
         dn = user.get_attribute("DN")
-        ldap_conn = self.ldap.connect(self.admin_dn, self.admin_secret)
+        ldap_conn = self.ldap.connect(self.root_dn, self.root_secret)
         ldap_conn.modify(dn, {"jpegPhoto": [(MODIFY_REPLACE, [avatar.binary])]})
 
     def __find(self, userid, mail=None):
         """Find attributes of an user by uid or mail in LDAP"""
         con = self.ldap.connection
         if not con:
-            con = self.ldap.connect(self.admin_dn, self.admin_secret)
+            con = self.ldap.connect(self.root_dn, self.root_secret)
         con.search(
-            f"ou=user,{self.dn}",
+            self.search_dn,
             f"(| (uid={userid})(mail={mail}))" if mail else f"(uid={userid})",
             SUBTREE,
             attributes=["uid", "givenName", "sn", "mail"],
@@ -205,12 +207,12 @@ class AuthLDAP(AuthPlugin):
         role: Role,
         new_name: Optional[str],
     ):
-        if self.admin_dn is None:
-            logger.error("admin_dn missing in ldap config!")
+        if self.root_dn is None:
+            logger.error("root_dn missing in ldap config!")
             raise InternalServerError
         try:
-            ldap_conn = self.ldap.connect(self.admin_dn, self.admin_secret)
-            ldap_conn.search(f"ou=group,{self.dn}", f"(cn={role.name})", SUBTREE, attributes=["cn"])
+            ldap_conn = self.ldap.connect(self.root_dn, self.root_secret)
+            ldap_conn.search(self.group_dn, f"(cn={role.name})", SUBTREE, attributes=["cn"])
             if len(ldap_conn.response) > 0:
                 dn = ldap_conn.response[0]["dn"]
                 if new_name:
@@ -218,13 +220,33 @@ class AuthLDAP(AuthPlugin):
                 else:
                     ldap_conn.delete(dn)
 
-        except (LDAPPasswordIsMandatoryError, LDAPBindError):
+        except LDAPPasswordIsMandatoryError:
             raise BadRequest
+        except LDAPBindError:
+            logger.debug(f"Could not bind to LDAP server", exc_info=True)
+            raise InternalServerError
+
+    def __hash(self, password):
+        if self.password_hash == "ARGON2":
+            from argon2 import PasswordHasher
+
+            return f"{{ARGON2}}{PasswordHasher().hash(password)}"
+        else:
+            from hashlib import pbkdf2_hmac, sha1
+            import base64
+
+            salt = os.urandom(16)
+            if self.password_hash == "PBKDF2":
+                rounds = 200000
+                password_hash = base64.b64encode(pbkdf2_hmac("sha512", password.encode("utf-8"), salt, rounds)).decode()
+                return f"{{PBKDF2-SHA512}}{rounds}${base64.b64encode(salt).decode()}${password_hash}"
+            else:
+                return f"{{SSHA}}{base64.b64encode(sha1(password + salt) + salt)}"
 
     def _get_groups(self, uid):
         groups = []
         self.ldap.connection.search(
-            "ou=group,{}".format(self.dn),
+            self.group_dn,
             "(memberUID={})".format(uid),
             SUBTREE,
             attributes=["cn"],
@@ -236,7 +258,7 @@ class AuthLDAP(AuthPlugin):
 
     def _get_all_roles(self):
         self.ldap.connection.search(
-            f"ou=group,{self.dn}",
+            self.group_dn,
             "(cn=*)",
             SUBTREE,
             attributes=["cn", "gidNumber", "memberUid"],
@@ -245,8 +267,7 @@ class AuthLDAP(AuthPlugin):
 
     def _set_roles(self, user: User):
         try:
-            ldap_conn = self.ldap.connect(self.admin_dn, self.admin_secret)
-
+            ldap_conn = self.ldap.connect(self.root_dn, self.root_secret)
             ldap_roles = self._get_all_roles()
 
             gid_numbers = sorted(ldap_roles, key=lambda i: i["attributes"]["gidNumber"], reverse=True)
@@ -255,7 +276,7 @@ class AuthLDAP(AuthPlugin):
             for user_role in user.roles:
                 if user_role not in [role["attributes"]["cn"][0] for role in ldap_roles]:
                     ldap_conn.add(
-                        f"cn={user_role},ou=group,{self.dn}",
+                        f"cn={user_role},{self.group_dn}",
                         ["posixGroup"],
                         attributes={"gidNumber": gid_number},
                     )

setup.py

@@ -41,7 +41,12 @@ setup(
         "werkzeug",
         mysql_driver,
     ],
-    extras_require={"ldap": ["flask_ldapconn", "ldap3"], "pricelist": ["pillow"], "test": ["pytest", "coverage"]},
+    extras_require={
+        "ldap": ["flask_ldapconn", "ldap3"],
+        "argon": ["argon2-cffi"],
+        "pricelist": ["pillow"],
+        "test": ["pytest", "coverage"],
+    },
     entry_points={
         "flaschengeist.plugin": [
             # Authentication providers