sysdb: try dealing with binary-content attributes

https://fedorahosted.org/sssd/ticket/1818

I have here a LDAP user entry which has this attribute

	loginAllowedTimeMap::
	 AAAAAAAAAP///38AAP///38AAP///38AAP///38AAP///38AAAAAAAAA

In the function sysdb_attrs_add_string(), called from
sdap_attrs_add_ldap_attr(), strlen() is called on this blob, which is
the wrong thing to do. The result of strlen is then used to populate
the .v_length member of a struct ldb_val - and this will set it to
zero in this case. (There is also the problem that there may not be
a '\0' at all in the blob.)

Subsequently, .v_length being 0 makes ldb_modify(), called from
sysdb_set_entry_attr(), return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX. End
result is that users do not get stored in the sysdb, and programs like
`id` or `getent ...` show incomplete information.

The bug was encountered with sssd-1.8.5. sssd-1.5.11 seemed to behave
fine, but that may not mean that is the absolute lower boundary of
introduction of the problem.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/providers/ldap/sdap_async.c b/src/providers/ldap/sdap_async.c
index 84497b75e..b7d98392b 100644
--- a/src/providers/ldap/sdap_async.c
+++ b/src/providers/ldap/sdap_async.c
@@ -2226,8 +2226,8 @@ sdap_attrs_add_ldap_attr(struct sysdb_attrs *ldap_attrs,
             DEBUG(SSSDBG_TRACE_INTERNAL, ("Adding %s [%s] to attributes "
                   "of [%s].\n", desc, el->values[i].data, objname));
 
-            ret = sysdb_attrs_add_string(attrs, attr_name,
-                                         (const char *) el->values[i].data);
+            ret = sysdb_attrs_add_mem(attrs, attr_name, el->values[i].data,
+                                      el->values[i].length);
             if (ret) {
                 return ret;
             }