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import logging
from urllib.parse import urlparse
from werkzeug.security import check_password_hash
from werkzeug.security import generate_password_hash
from .abstract import AbstractController
from newspipe.models import User
logger = logging.getLogger(__name__)
# FOR LDAP
# Reference: session_app
import ldap3
from ldap3.core.exceptions import LDAPBindError, LDAPPasswordIsMandatoryError
class UserController(AbstractController):
_db_cls = User
_user_id_key = "id"
def _handle_password(self, attrs):
if attrs.get("password"):
attrs["pwdhash"] = generate_password_hash(attrs.pop("password"))
elif "password" in attrs:
del attrs["password"]
def check_password(self, user, password):
return check_password_hash(user.pwdhash, password)
def create(self, **attrs):
self._handle_password(attrs)
return super().create(**attrs)
def update(self, filters, attrs):
self._handle_password(attrs)
return super().update(filters, attrs)
class LdapuserController:
def check_password(self, user, password, config):
this_uri = self.get_next_ldap_server(config)
# return this_uri
this_user = self.list_matching_users(
server_uri=this_uri,
bind_dn=config["LDAP_BIND_DN"],
bind_pw=config["LDAP_BIND_PASSWORD"],
user_base=config["LDAP_USER_BASE"],
username=user,
user_match_attrib=config["LDAP_USER_MATCH_ATTRIB"],
_filter=config["LDAP_FILTER"] if "LDAP_FILTER" in config else "",
)
# list_matching_users always returns list, so if it contains <> 1 we are in trouble
if len(this_user) != 1:
print(
f"WARNING: cannot determine unique user for {config['LDAP_USER_MATCH_ATTRIB']}={user} which returned {this_user}"
)
return False
# logger does not work here+flask for some reason. Very sad!
# now we have exactly one user, this_user[0]
this_user = this_user[0]
ldapuser = self.authenticated_user(
server_uri=this_uri, user_dn=this_user, password=password
)
if ldapuser:
return ldapuser
# return str(config)
# return this_user
return False
def get_next_ldap_server(self, config):
# on first ldap_login attempt, cache this lookup result:
if "LDAP_HOSTS" not in config:
this_domain = urlparse(config["LDAP_URI"]).hostname
config["LDAP_HOSTS"] = self.list_ldap_servers_for_domain(this_domain)
else:
# rotate them! So every ldap_login attempt will use the next ldap server in the list.
this_list = config["LDAP_HOSTS"]
a = this_list[0]
this_list.append(a)
this_list.pop(0)
config["LDAP_HOSTS"] = this_list
# construct a new, full uri.
this_netloc = config["LDAP_HOSTS"][0]
up = urlparse(config["LDAP_URI"])
if up.port:
this_netloc += f":{up.port}"
this_uri = up._replace(netloc=this_netloc).geturl()
return this_uri
def list_matching_users(
self,
server_uri="",
bind_dn="",
bind_pw="",
connection=None,
user_base="",
username="",
user_match_attrib="",
_filter="",
):
search_filter = f"({user_match_attrib}={username})"
if _filter:
search_filter = f"(&{search_filter}{_filter})"
if connection and isinstance(connection, ldap3.core.connection.Connection):
conn = connection
else:
conn = self.get_ldap_connection(server_uri, bind_dn, bind_pw)
conn.search(
search_base=user_base, search_filter=search_filter, search_scope="SUBTREE"
)
print(f"DEBUG: search_base {user_base}")
print(f"DEBUG: search_filter {search_filter}")
result = []
for i in conn.entries:
result.append(i.entry_dn)
print(f"DEBUG: result {result}")
return result
def get_ldap_connection(self, server_uri, bind_dn, bind_pw):
server = ldap3.Server(server_uri)
conn = ldap3.Connection(server, auto_bind=True, user=bind_dn, password=bind_pw)
return conn
def list_ldap_servers_for_domain(self, domain):
# return list of hostnames from the _ldap._tcp.{domain} SRV lookup
try:
import dns
import dns.resolver
except:
print("Need python3-dns or dnspython installed for dns lookups.")
return [domain]
namelist = []
try:
query = dns.resolver.query(f"_ldap._tcp.{domain}", "SRV")
except dns.resolver.NXDOMAIN:
# no records exist that match the request, so we were probably given a specific hostname, and an empty query will trigger the logic below that will add the original domain to the list.
query = []
for i in query:
namelist.append(i.target.to_text().rstrip("."))
if not len(namelist):
namelist.append(domain)
return namelist
def ldap_login(self, username, password):
# print(f"DEBUG: Trying user {username} with pw '{password}'")
this_uri = self.get_next_ldap_server(app)
# Perform the ldap interactions
user = self.authenticated_user(
server_uri=this_uri, user_dn=username, password=password
)
if user:
return user
else:
return False
return False
def authenticated_user(self, server_uri, user_dn, password):
print(f"server_uri: {server_uri}")
print(f"user_dn: {user_dn}")
try:
conn = self.get_ldap_connection(server_uri, user_dn, password)
return conn
except LDAPBindError as e:
if "invalidCredentials" in str(e):
print("Invalid credentials.")
return False
else:
raise e
# except (LDAPPasswordIsMandatoryError, LDAPBindError):
# print("Either an ldap password is required, or we had another bind error.")
# return False
return False
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