Enumerate object with escaped characters in name

This patch fixes enumeration when DN in LDAP server
contains special characters.

The libldb expects that '\' is followed by two hex digits
in filter. Strings like '\#' must be sanitized into '\5c#'
before they are used for searching.

Resolves: #7876

Reviewed-by: Alejandro López <[email protected]>
Reviewed-by: Dan Lavu <[email protected]>

Author: thalman

src/db/sysdb_search.c

@@ -814,6 +814,7 @@ static errno_t sysdb_enum_dn_filter(TALLOC_CTX *mem_ctx,
 {
     TALLOC_CTX *tmp_ctx = NULL;
     char *dn_filter;
+    char *sanitized_dn;
     const char *fqname;
     errno_t ret;
 
@@ -844,11 +845,18 @@ static errno_t sysdb_enum_dn_filter(TALLOC_CTX *mem_ctx,
     }
 
     for (size_t i = 0; i < ts_res->count; i++) {
+        ret = sss_filter_sanitize_dn(tmp_ctx,
+                                     ldb_dn_get_linearized(ts_res->msgs[i]->dn),
+                                     &sanitized_dn);
+        if (ret != EOK) {
+            goto done;
+        }
         dn_filter = talloc_asprintf_append(
                                   dn_filter,
                                   "(%s=%s)",
                                   SYSDB_DN,
-                                  ldb_dn_get_linearized(ts_res->msgs[i]->dn));
+                                  sanitized_dn);
+        talloc_free(sanitized_dn);
         if (dn_filter == NULL) {
             ret = ENOMEM;
             goto done;