1 files changed, 79 insertions, 0 deletions
diff --git a/source3/libads/ads_ldap.c b/source3/libads/ads_ldap.c
index dcceaaeb83..944cb1599c 100644
--- a/source3/libads/ads_ldap.c
+++ b/source3/libads/ads_ldap.c
@@ -152,4 +152,83 @@ done:
 	return status;
 }
 
+
+/* convert a sid to a DN */
+
+ADS_STATUS ads_sid_to_dn(ADS_STRUCT *ads,
+			 TALLOC_CTX *mem_ctx,
+			 const DOM_SID *sid,
+			 char **dn)
+{
+	ADS_STATUS rc;
+	LDAPMessage *msg = NULL;
+	LDAPMessage *entry = NULL;
+	char *ldap_exp;
+	char *sidstr = NULL;
+	int count;
+	char *dn2 = NULL;
+
+	const char *attr[] = {
+		"dn",
+		NULL
+	};
+
+	if (!(sidstr = sid_binstring(sid))) {
+		DEBUG(1,("ads_sid_to_dn: sid_binstring failed!\n"));
+		rc = ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
+		goto done;
+	}
+
+	if(!(ldap_exp = talloc_asprintf(mem_ctx, "(objectSid=%s)", sidstr))) {
+		DEBUG(1,("ads_sid_to_dn: talloc_asprintf failed!\n"));
+		rc = ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
+		goto done;
+	}
+
+	rc = ads_search_retry(ads, (void **)&msg, ldap_exp, attr);
+
+	if (!ADS_ERR_OK(rc)) {
+		DEBUG(1,("ads_sid_to_dn ads_search: %s\n", ads_errstr(rc)));
+		goto done;
+	}
+
+	if ((count = ads_count_replies(ads, msg)) != 1) {
+		fstring sid_string;
+		DEBUG(1,("ads_sid_to_dn (sid=%s): Not found (count=%d)\n", 
+			 sid_to_string(sid_string, sid), count));
+		rc = ADS_ERROR_NT(NT_STATUS_UNSUCCESSFUL);
+		goto done;
+	}
+
+	entry = ads_first_entry(ads, msg);
+
+	dn2 = ads_get_dn(ads, entry);
+
+	if (!dn2) {
+		rc = ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
+		goto done;
+	}
+
+	*dn = talloc_strdup(mem_ctx, dn2);
+
+	if (!*dn) {
+		ads_memfree(ads, dn2);
+		rc = ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
+		goto done;
+	}
+
+	rc = ADS_ERROR_NT(NT_STATUS_OK);
+
+	DEBUG(3,("ads sid_to_dn mapped %s\n", dn2));
+
+	SAFE_FREE(dn2);
+done:
+	if (msg) ads_msgfree(ads, msg);
+	if (dn2) ads_memfree(ads, dn2);
+
+	SAFE_FREE(sidstr);
+
+	return rc;
+}
+
 #endif