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LDAP auth: support TLS & start_tls also with python-ldap

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Until now, every connection to the LDAP server was silently unencryptedr
when using Python's ldap module instead of the ldap3 module.
I.e. using Python's ldap module was inherently insecure, as there was not
even a hint that the config settings for encryption were ignored.

This commit changes this and brings LDAP authentication based on the ldap
module feature-wise on par with the one based on the ldap3 module.
This commit is contained in:
Peter Marschall 2025-09-14 13:57:36 +02:00
parent f8b15eb122
commit 2d7a9b001c
1 changed files with 39 additions and 3 deletions
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42
radicale/auth/ldap.py
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@ -83,7 +83,7 @@ class Auth(auth.BaseAuth):
self._ldap_module_version = 2
self.ldap = ldap
except ImportError as e:
raise RuntimeError("LDAP authentication requires the ldap3 module") from e
raise RuntimeError("LDAP authentication requires the ldap3 or ldap module") from e
self._ldap_ignore_attribute_create_modify_timestamp = configuration.get("auth", "ldap_ignore_attribute_create_modify_timestamp")
self._ldap_uri = configuration.get("auth", "ldap_uri")
@ -183,8 +183,26 @@ class Auth(auth.BaseAuth):
"""Bind as reader dn"""
logger.debug(f"_login2 {self._ldap_uri}, {self._ldap_reader_dn}")
conn = self.ldap.initialize(self._ldap_uri)
conn.protocol_version = 3
conn.protocol_version = self.ldap.VERSION3
conn.set_option(self.ldap.OPT_REFERRALS, 0)
if self._ldap_security in ("tls", "starttls"):
"""certificate validation mode"""
if self._ldap_ssl_verify_mode == ssl.CERT_REQUIRED:
conn.set_option(self.ldap.OPT_X_TLS_REQUIRE_CERT, self.ldap.OPT_X_TLS_DEMAND)
elif self._ldap_ssl_verify_mode == ssl.CERT_OPTIONAL:
conn.set_option(self.ldap.OPT_X_TLS_REQUIRE_CERT, self.ldap.OPT_X_TLS_ALLOW)
else:
conn.set_option(self.ldap.OPT_X_TLS_REQUIRE_CERT, self.ldap.OPT_X_TLS_NONE)
"""CA file to validate certificate against"""
if self._ldap_ssl_ca_file:
conn.set_option(self.ldap.OPT_X_TLS_CACERTFILE, self._ldap_ssl_ca_file)
"""create TLS context- this must be the last TLS setting"""
conn.set_option(self.ldap.OPT_X_TLS_NEWCTX, self.ldap.OPT_ON)
if self._ldap_security == "starttls":
conn.start_tls_s()
conn.simple_bind_s(self._ldap_reader_dn, self._ldap_secret)
"""Search for the dn of user to authenticate"""
escaped_login = self.ldap.filter.escape_filter_chars(login)
@ -234,8 +252,26 @@ class Auth(auth.BaseAuth):
try:
"""Bind as user to authenticate"""
conn = self.ldap.initialize(self._ldap_uri)
conn.protocol_version = 3
conn.protocol_version = self.ldap.VERSION3
conn.set_option(self.ldap.OPT_REFERRALS, 0)
if self._ldap_security in ("tls", "starttls"):
"""certificate validation mode"""
if self._ldap_ssl_verify_mode == ssl.CERT_REQUIRED:
conn.set_option(self.ldap.OPT_X_TLS_REQUIRE_CERT, self.ldap.OPT_X_TLS_DEMAND)
elif self._ldap_ssl_verify_mode == ssl.CERT_OPTIONAL:
conn.set_option(self.ldap.OPT_X_TLS_REQUIRE_CERT, self.ldap.OPT_X_TLS_ALLOW)
else:
conn.set_option(self.ldap.OPT_X_TLS_REQUIRE_CERT, self.ldap.OPT_X_TLS_NONE)
"""CA file to validate certificate against"""
if self._ldap_ssl_ca_file:
conn.set_option(self.ldap.OPT_X_TLS_CACERTFILE, self._ldap_ssl_ca_file)
"""create TLS context- this must be the last TLS setting"""
conn.set_option(self.ldap.OPT_X_TLS_NEWCTX, self.ldap.OPT_ON)
if self._ldap_security == "starttls":
conn.start_tls_s()
conn.simple_bind_s(user_dn, password)
if self._ldap_user_attr:
if user_entry[1][self._ldap_user_attr]: