ldap_attrs: escape ldap search filter (#5435) (#5470)

* escape ldap search filter

* move escape to separate line

* add changelog fragment

* Update changelogs/fragments/5435-escape-ldap-param.yml

Co-authored-by: Felix Fontein <felix@fontein.de>

* fix encoding

* fixup! fix encoding

Co-authored-by: Felix Fontein <felix@fontein.de>
(cherry picked from commit 1a97ca1a6f)

Co-authored-by: Reto Kupferschmid <kupferschmid@puzzle.ch>

changelogs/fragments/5435-escape-ldap-param.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - ldap_attrs - fix bug which caused a ``Bad search filter`` error. The error was occuring when the ldap attribute value contained special characters such as ``(`` or ``*`` (https://github.com/ansible-collections/community.general/issues/5434, https://github.com/ansible-collections/community.general/pull/5435).

plugins/modules/net_tools/ldap/ldap_attrs.py

@@ -166,7 +166,7 @@ modlist:
 import traceback
 
 from ansible.module_utils.basic import AnsibleModule, missing_required_lib
-from ansible.module_utils.common.text.converters import to_native, to_bytes
+from ansible.module_utils.common.text.converters import to_native, to_bytes, to_text
 from ansible_collections.community.general.plugins.module_utils.ldap import LdapGeneric, gen_specs
 
 import re
@@ -174,6 +174,7 @@ import re
 LDAP_IMP_ERR = None
 try:
     import ldap
+    import ldap.filter
 
     HAS_LDAP = True
 except ImportError:
@@ -262,7 +263,8 @@ class LdapAttrs(LdapGeneric):
     def _is_value_present(self, name, value):
         """ True if the target attribute has the given value. """
         try:
-            filterstr = "(%s=%s)" % (name, value.decode())
+            escaped_value = ldap.filter.escape_filter_chars(to_text(value))
+            filterstr = "(%s=%s)" % (name, escaped_value)
             dns = self.connection.search_s(self.dn, ldap.SCOPE_BASE, filterstr)
             is_present = len(dns) == 1
         except ldap.NO_SUCH_OBJECT: