r7221: Add the start of a KDC service (to be built on a 'libkdc' from a to be

included Heimdal) to Samba4.

Andrew Bartlett
(This used to be commit 51ba3ea60c265b837821b6c3e031dfe229c10d6a)

3 files changed, 246 insertions, 0 deletions

diff --git a/source4/kdc/config.mk b/source4/kdc/config.mk
new file mode 100644
index 0000000000..b9313b2544
--- /dev/null
+++ b/source4/kdc/config.mk
@@ -0,0 +1,11 @@
+# CLDAP server subsystem
+
+#######################
+# Start SUBSYSTEM CLDAPD
+[SUBSYSTEM::KDC]
+INIT_OBJ_FILES = \
+		kdc/kdc.o
+REQUIRED_SUBSYSTEMS = \
+		SOCKET
+# End SUBSYSTEM CLDAPD
+#######################
diff --git a/source4/kdc/kdc.c b/source4/kdc/kdc.c
new file mode 100644
index 0000000000..ae8605467a
--- /dev/null
+++ b/source4/kdc/kdc.c
@@ -0,0 +1,187 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   KDC Server startup
+
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
+   Copyright (C) Andrew Tridgell	2005
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "smbd/service_task.h"
+#include "lib/events/events.h"
+#include "lib/socket/socket.h"
+#include "kdc/kdc.h"
+
+
+/*
+  handle fd events on a cldap_socket
+*/
+static void kdc_socket_handler(struct event_context *ev, struct fd_event *fde,
+			       uint16_t flags, void *private)
+{
+	NTSTATUS status;
+	struct kdc_socket *kdc_socket = talloc_get_type(private, struct kdc_socket);
+	if (flags & EVENT_FD_WRITE) {
+		/* this should not happen */
+	} else if (flags & EVENT_FD_READ) {
+		TALLOC_CTX *tmp_ctx = talloc_new(kdc_socket);
+		DATA_BLOB blob = data_blob_talloc(tmp_ctx, NULL, 64 * 1024);
+		size_t nread;
+		const char *src_addr;
+		int src_port;
+
+		DEBUG(0, ("incoming!\n"));
+
+		status = socket_recvfrom(kdc_socket->sock, blob.data, blob.length, &nread, 0,
+					 &src_addr, &src_port);
+		if (!NT_STATUS_IS_OK(status)) {
+			talloc_free(tmp_ctx);
+			return;
+		}
+		talloc_steal(tmp_ctx, src_addr);
+		blob.length = nread;
+		
+		DEBUG(2,("Received krb5 packet of length %d from %s:%d\n", 
+			 blob.length, src_addr, src_port));
+		
+
+	}
+}
+
+/*
+  start listening on the given address
+*/
+static NTSTATUS kdc_add_socket(struct kdc_server *kdc, const char *address)
+{
+	struct kdc_socket *kdc_socket;
+	NTSTATUS status;
+
+	kdc_socket = talloc(kdc, struct kdc_socket);
+	NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
+
+	status = socket_create("ip", SOCKET_TYPE_DGRAM, &kdc_socket->sock, 0);
+	if (!NT_STATUS_IS_OK(status)) {
+		talloc_free(kdc_socket);
+		return status;
+	}
+
+	kdc_socket->kdc = kdc;
+
+	talloc_steal(kdc_socket, kdc_socket->sock);
+
+	kdc_socket->fde = event_add_fd(kdc->task->event_ctx, kdc, 
+				       socket_get_fd(kdc_socket->sock), 0,
+				       kdc_socket_handler, kdc_socket);
+
+	status = socket_listen(kdc_socket->sock, address, lp_krb5_port(), 0, 0);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(0,("Failed to bind to %s:%d - %s\n", 
+			 address, lp_krb5_port(), nt_errstr(status)));
+		talloc_free(kdc_socket);
+		return status;
+	}
+
+	return NT_STATUS_OK;
+}
+
+
+/*
+  setup our listening sockets on the configured network interfaces
+*/
+NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc)
+{
+	int num_interfaces = iface_count();
+	TALLOC_CTX *tmp_ctx = talloc_new(kdc);
+	NTSTATUS status;
+
+	/* if we are allowing incoming packets from any address, then
+	   we need to bind to the wildcard address */
+	if (!lp_bind_interfaces_only()) {
+		status = kdc_add_socket(kdc, "0.0.0.0");
+		NT_STATUS_NOT_OK_RETURN(status);
+	} else {
+		int i;
+
+		for (i=0; i<num_interfaces; i++) {
+			const char *address = talloc_strdup(tmp_ctx, iface_n_ip(i));
+			status = kdc_add_socket(kdc, address);
+			NT_STATUS_NOT_OK_RETURN(status);
+		}
+	}
+
+	talloc_free(tmp_ctx);
+
+	return NT_STATUS_OK;
+}
+
+/*
+  startup the kdc task
+*/
+static void kdc_task_init(struct task_server *task)
+{
+	struct kdc_server *kdc;
+	NTSTATUS status;
+
+	if (iface_count() == 0) {
+		task_terminate(task, "kdc: no network interfaces configured");
+		return;
+	}
+
+	kdc = talloc(task, struct kdc_server);
+	if (kdc == NULL) {
+		task_terminate(task, "kdc: out of memory");
+		return;
+	}
+
+	kdc->task = task;
+
+	/* Setup the KDC configuration */
+	kdc->config = talloc(kdc, struct krb5_kdc_configuration);
+	if (!kdc->config) {
+		task_terminate(task, "kdc: out of memory");
+		return;
+	}
+	krb5_kdc_default_config(kdc->config);
+
+	/* TODO: Fill in the hdb and logging details */
+
+	/* start listening on the configured network interfaces */
+	status = kdc_startup_interfaces(kdc);
+	if (!NT_STATUS_IS_OK(status)) {
+		task_terminate(task, "kdc failed to setup interfaces");
+		return;
+	}
+
+	DEBUG(0, ("When I grow up, I want to be a KDC!\n"));
+}
+
+
+/*
+  called on startup of the KDC service 
+*/
+static NTSTATUS kdc_init(struct event_context *event_ctx, 
+			 const struct model_ops *model_ops)
+{	
+	return task_server_startup(event_ctx, model_ops, kdc_task_init);
+}
+
+/* called at smbd startup - register ourselves as a server service */
+NTSTATUS server_service_kdc_init(void)
+{
+	return register_server_service("kdc", kdc_init);
+}
diff --git a/source4/kdc/kdc.h b/source4/kdc/kdc.h
new file mode 100644
index 0000000000..25b8745bce
--- /dev/null
+++ b/source4/kdc/kdc.h
@@ -0,0 +1,48 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   KDC structures
+
+   Copyright (C) Andrew Tridgell	2005
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "system/kerberos.h"
+#include <kdc.h>
+
+
+/*
+  top level context structure for the cldap server
+*/
+struct kdc_server {
+	struct task_server *task;
+	struct krb5_kdc_configuration *config;
+};
+
+struct kdc_socket {
+	struct socket_context *sock;
+	struct event_context *event_ctx;
+	
+	struct kdc_server *kdc;
+
+	/* the fd event */
+	struct fd_event *fde;
+
+	/* a queue of outgoing replies */
+	struct kdc_reply *send_queue;
+
+};