From 04d776a4090de08deb9c4912636bdb56082ce9d2 Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Wed, 26 Jul 2006 06:18:13 +0000
Subject: r17251: - split out the starttls into its own function - give an
 operations error when tls is already on the socket

metze
(This used to be commit 9190d134c9be774c53f6dae52b7c4cdcc053d00f)
---
 source4/ldap_server/ldap_extended.c | 138 +++++++++++++++++++++++++-----------
 1 file changed, 96 insertions(+), 42 deletions(-)

diff --git a/source4/ldap_server/ldap_extended.c b/source4/ldap_server/ldap_extended.c
index bc757fc973..06e5feb828 100644
--- a/source4/ldap_server/ldap_extended.c
+++ b/source4/ldap_server/ldap_extended.c
@@ -41,56 +41,110 @@ static void ldapsrv_start_tls(void *private)
 	packet_set_socket(ctx->conn->packet, ctx->conn->connection->socket);
 }
 
-NTSTATUS ldapsrv_ExtendedRequest(struct ldapsrv_call *call)
+static NTSTATUS ldapsrv_StartTLS(struct ldapsrv_call *call,
+				 struct ldapsrv_reply *reply,
+				 const char **errstr)
 {
-	struct ldap_ExtendedRequest *req = &call->request->r.ExtendedRequest;
-	struct ldapsrv_reply *reply;
+	struct ldapsrv_starttls_context *ctx;
 
-	DEBUG(10, ("Extended\n"));
+	(*errstr) = NULL;
 
-	reply = ldapsrv_init_reply(call, LDAP_TAG_ExtendedResponse);
-	if (!reply) {
-		return NT_STATUS_NO_MEMORY;
+	/*
+	 * TODO: give LDAP_OPERATIONS_ERROR also when
+	 *       there're pending requests or there's
+	 *       a SASL bind in progress
+	 *       (see rfc4513 section 3.1.1)
+	 */
+	if (call->conn->sockets.tls) {
+		(*errstr) = talloc_asprintf(reply, "START-TLS: TLS is already enabled on this LDAP session");
+		return NT_STATUS_LDAP(LDAP_OPERATIONS_ERROR);
 	}
 
-	ZERO_STRUCT(reply->msg->r);
-
-	/* check if we have a START_TLS call */
-	if (strcmp(req->oid, LDB_EXTENDED_START_TLS_OID) == 0) {
-		struct ldapsrv_starttls_context *ctx;
-		int result = 0;
-		const char *errstr;
-		ctx = talloc(call, struct ldapsrv_starttls_context); 
-
-		if (ctx) {
-			ctx->conn = call->conn;
-			ctx->tls_socket = tls_init_server(call->conn->service->tls_params,
-						 call->conn->connection->socket,
-						 call->conn->connection->event.fde, 
-						 NULL);
-		} 
-
-		if (!ctx || !ctx->tls_socket) {
-			result = LDAP_OPERATIONS_ERROR;
-			errstr = talloc_asprintf(reply, 
-						 "START-TLS: Failed to setup TLS socket");
-		} else {
-			result = LDAP_SUCCESS;
-			errstr = NULL;
-			call->send_callback = ldapsrv_start_tls;
-			call->send_private  = ctx;
-		}
-
-		reply->msg->r.ExtendedResponse.response.resultcode = result;
-		reply->msg->r.ExtendedResponse.response.errormessage = errstr;
-		reply->msg->r.ExtendedResponse.oid = talloc_strdup(reply, req->oid);
-		if (!reply->msg->r.ExtendedResponse.oid) {
-			return NT_STATUS_NO_MEMORY;
-		}
+	ctx = talloc(call, struct ldapsrv_starttls_context);
+	NT_STATUS_HAVE_NO_MEMORY(ctx);
+
+	ctx->conn = call->conn;
+	ctx->tls_socket = tls_init_server(call->conn->service->tls_params,
+					  call->conn->connection->socket,
+					  call->conn->connection->event.fde, 
+					  NULL);
+	if (!ctx->tls_socket) {
+		(*errstr) = talloc_asprintf(reply, "START-TLS: Failed to setup TLS socket");
+		return NT_STATUS_LDAP(LDAP_OPERATIONS_ERROR);
 	}
 
-	/* TODO: OID not recognized, return a protocol error */
+	call->send_callback = ldapsrv_start_tls;
+	call->send_private  = ctx;
+
+	reply->msg->r.ExtendedResponse.response.resultcode = LDAP_SUCCESS;
+	reply->msg->r.ExtendedResponse.response.errormessage = NULL;
 
 	ldapsrv_queue_reply(call, reply);
 	return NT_STATUS_OK;
 }
+
+struct ldapsrv_extended_operation {
+	const char *oid;
+	NTSTATUS (*fn)(struct ldapsrv_call *call, struct ldapsrv_reply *reply, const char **errorstr);
+};
+
+static struct ldapsrv_extended_operation extended_ops[] = {
+	{
+		.oid	= LDB_EXTENDED_START_TLS_OID,
+		.fn	= ldapsrv_StartTLS,
+	},{
+		.oid	= NULL,
+		.fn	= NULL,
+	}
+};
+
+NTSTATUS ldapsrv_ExtendedRequest(struct ldapsrv_call *call)
+{
+	struct ldap_ExtendedRequest *req = &call->request->r.ExtendedRequest;
+	struct ldapsrv_reply *reply;
+	int result = LDAP_PROTOCOL_ERROR;
+	const char *error_str = NULL;
+	NTSTATUS status = NT_STATUS_OK;
+	uint32_t i;
+
+	DEBUG(10, ("Extended\n"));
+
+	reply = ldapsrv_init_reply(call, LDAP_TAG_ExtendedResponse);
+	NT_STATUS_HAVE_NO_MEMORY(reply);
+ 
+ 	ZERO_STRUCT(reply->msg->r);
+	reply->msg->r.ExtendedResponse.oid = talloc_steal(reply, req->oid);
+	reply->msg->r.ExtendedResponse.response.resultcode = LDAP_PROTOCOL_ERROR;
+	reply->msg->r.ExtendedResponse.response.errormessage = NULL;
+ 
+	for (i=0; extended_ops[i].oid; i++) {
+		if (strcmp(extended_ops[i].oid,req->oid) != 0) continue;
+ 
+		/* 
+		 * if the backend function returns an error we
+		 * need to send the reply otherwise the reply is already
+		 * send and we need to return directly
+		 */
+		status = extended_ops[i].fn(call, reply, &error_str);
+		NT_STATUS_IS_OK_RETURN(status);
+ 
+		if (NT_STATUS_IS_LDAP(status)) {
+			result = NT_STATUS_LDAP_CODE(status);
+		} else {
+ 			result = LDAP_OPERATIONS_ERROR;
+			error_str = talloc_asprintf(reply, "Extended Operation(%s) failed: %s",
+						    req->oid, nt_errstr(status));
+ 		}
+ 	}
+	/* if we haven't found the oid, then status is still NT_STATUS_OK */
+	if (NT_STATUS_IS_OK(status)) {
+		error_str = talloc_asprintf(reply, "Extended Operation(%s) not supported",
+					    req->oid);
+	}
+ 
+	reply->msg->r.ExtendedResponse.response.resultcode = result;
+	reply->msg->r.ExtendedResponse.response.errormessage = error_str;
+ 
+ 	ldapsrv_queue_reply(call, reply);
+ 	return NT_STATUS_OK;
+}
-- 
cgit