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samba-mirror/source4/kdc/kdc.c

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/*
Unix SMB/CIFS implementation.
KDC Server startup
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
Copyright (C) Andrew Tridgell 2005
Copyright (C) Stefan Metzmacher 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 "smbd/service.h"
#include "smbd/service_stream.h"
#include "smbd/process_model.h"
#include "lib/events/events.h"
#include "lib/socket/socket.h"
#include "kdc/kdc.h"
#include "system/network.h"
#include "lib/util/dlinklist.h"
#include "lib/messaging/irpc.h"
#include "lib/stream/packet.h"
#include "librpc/gen_ndr/samr.h"
#include "lib/socket/netif.h"
#include "heimdal/kdc/windc_plugin.h"
#include "heimdal/lib/krb5/krb5_locl.h"
#include "heimdal/kdc/kdc_locl.h"
/* Disgusting hack to get a mem_ctx into the hdb plugin, when used as a keytab */
TALLOC_CTX *kdc_mem_ctx;
/* hold all the info needed to send a reply */
struct kdc_reply {
struct kdc_reply *next, *prev;
struct socket_address *dest;
DATA_BLOB packet;
};
typedef BOOL (*kdc_process_fn_t)(struct kdc_server *kdc,
TALLOC_CTX *mem_ctx,
DATA_BLOB *input,
DATA_BLOB *reply,
struct socket_address *peer_addr,
struct socket_address *my_addr,
int datagram);
/* hold information about one kdc socket */
struct kdc_socket {
struct socket_context *sock;
struct kdc_server *kdc;
struct fd_event *fde;
/* a queue of outgoing replies that have been deferred */
struct kdc_reply *send_queue;
kdc_process_fn_t process;
};
/*
state of an open tcp connection
*/
struct kdc_tcp_connection {
/* stream connection we belong to */
struct stream_connection *conn;
/* the kdc_server the connection belongs to */
struct kdc_server *kdc;
struct packet_context *packet;
kdc_process_fn_t process;
};
/*
handle fd send events on a KDC socket
*/
static void kdc_send_handler(struct kdc_socket *kdc_socket)
{
while (kdc_socket->send_queue) {
struct kdc_reply *rep = kdc_socket->send_queue;
NTSTATUS status;
size_t sendlen;
status = socket_sendto(kdc_socket->sock, &rep->packet, &sendlen,
rep->dest);
if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
break;
}
if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_BUFFER_SIZE)) {
/* Replace with a krb err, response to big */
}
DLIST_REMOVE(kdc_socket->send_queue, rep);
talloc_free(rep);
}
if (kdc_socket->send_queue == NULL) {
EVENT_FD_NOT_WRITEABLE(kdc_socket->fde);
}
}
/*
handle fd recv events on a KDC socket
*/
static void kdc_recv_handler(struct kdc_socket *kdc_socket)
{
NTSTATUS status;
TALLOC_CTX *tmp_ctx = talloc_new(kdc_socket);
DATA_BLOB blob;
struct kdc_reply *rep;
DATA_BLOB reply;
size_t nread, dsize;
struct socket_address *src;
struct socket_address *my_addr;
int ret;
status = socket_pending(kdc_socket->sock, &dsize);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(tmp_ctx);
return;
}
blob = data_blob_talloc(tmp_ctx, NULL, dsize);
if (blob.data == NULL) {
/* hope this is a temporary low memory condition */
talloc_free(tmp_ctx);
return;
}
status = socket_recvfrom(kdc_socket->sock, blob.data, blob.length, &nread,
tmp_ctx, &src);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(tmp_ctx);
return;
}
blob.length = nread;
DEBUG(10,("Received krb5 UDP packet of length %lu from %s:%u\n",
(long)blob.length, src->addr, (uint16_t)src->port));
my_addr = socket_get_my_addr(kdc_socket->sock, tmp_ctx);
if (!my_addr) {
talloc_free(tmp_ctx);
return;
}
/* Call krb5 */
ret = kdc_socket->process(kdc_socket->kdc,
tmp_ctx,
&blob,
&reply,
src, my_addr,
1 /* Datagram */);
if (!ret) {
talloc_free(tmp_ctx);
return;
}
/* queue a pending reply */
rep = talloc(kdc_socket, struct kdc_reply);
if (rep == NULL) {
talloc_free(tmp_ctx);
return;
}
rep->dest = talloc_steal(rep, src);
rep->packet = reply;
talloc_steal(rep, reply.data);
if (rep->packet.data == NULL) {
talloc_free(rep);
talloc_free(tmp_ctx);
return;
}
DLIST_ADD_END(kdc_socket->send_queue, rep, struct kdc_reply *);
EVENT_FD_WRITEABLE(kdc_socket->fde);
talloc_free(tmp_ctx);
}
/*
handle fd events on a KDC socket
*/
static void kdc_socket_handler(struct event_context *ev, struct fd_event *fde,
uint16_t flags, void *private)
{
struct kdc_socket *kdc_socket = talloc_get_type(private, struct kdc_socket);
if (flags & EVENT_FD_WRITE) {
kdc_send_handler(kdc_socket);
}
if (flags & EVENT_FD_READ) {
kdc_recv_handler(kdc_socket);
}
}
static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, const char *reason)
{
stream_terminate_connection(kdcconn->conn, reason);
}
/*
receive a full packet on a KDC connection
*/
static NTSTATUS kdc_tcp_recv(void *private, DATA_BLOB blob)
{
struct kdc_tcp_connection *kdcconn = talloc_get_type(private,
struct kdc_tcp_connection);
NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
TALLOC_CTX *tmp_ctx = talloc_new(kdcconn);
int ret;
DATA_BLOB input, reply;
struct socket_address *src_addr;
struct socket_address *my_addr;
talloc_steal(tmp_ctx, blob.data);
src_addr = socket_get_peer_addr(kdcconn->conn->socket, tmp_ctx);
if (!src_addr) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
my_addr = socket_get_my_addr(kdcconn->conn->socket, tmp_ctx);
if (!my_addr) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
/* Call krb5 */
input = data_blob_const(blob.data + 4, blob.length - 4);
ret = kdcconn->process(kdcconn->kdc,
tmp_ctx,
&input,
&reply,
src_addr,
my_addr,
0 /* Not datagram */);
if (!ret) {
talloc_free(tmp_ctx);
return NT_STATUS_INTERNAL_ERROR;
}
/* and now encode the reply */
blob = data_blob_talloc(kdcconn, NULL, reply.length + 4);
if (!blob.data) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
RSIVAL(blob.data, 0, reply.length);
memcpy(blob.data + 4, reply.data, reply.length);
status = packet_send(kdcconn->packet, blob);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(tmp_ctx);
return status;
}
/* the call isn't needed any more */
talloc_free(tmp_ctx);
return NT_STATUS_OK;
}
/*
receive some data on a KDC connection
*/
static void kdc_tcp_recv_handler(struct stream_connection *conn, uint16_t flags)
{
struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private,
struct kdc_tcp_connection);
packet_recv(kdcconn->packet);
}
/*
called on a tcp recv error
*/
static void kdc_tcp_recv_error(void *private, NTSTATUS status)
{
struct kdc_tcp_connection *kdcconn = talloc_get_type(private, struct kdc_tcp_connection);
kdc_tcp_terminate_connection(kdcconn, nt_errstr(status));
}
/*
called when we can write to a connection
*/
static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
{
struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private,
struct kdc_tcp_connection);
packet_queue_run(kdcconn->packet);
}
/**
Wrapper for krb5_kdc_process_krb5_request, converting to/from Samba
calling conventions
*/
static BOOL kdc_process(struct kdc_server *kdc,
TALLOC_CTX *mem_ctx,
DATA_BLOB *input,
DATA_BLOB *reply,
struct socket_address *peer_addr,
struct socket_address *my_addr,
int datagram_reply)
{
int ret;
krb5_data k5_reply;
krb5_data_zero(&k5_reply);
DEBUG(10,("Received KDC packet of length %lu from %s:%d\n",
(long)input->length - 4, peer_addr->addr, peer_addr->port));
ret = krb5_kdc_process_krb5_request(kdc->smb_krb5_context->krb5_context,
kdc->config,
input->data, input->length,
&k5_reply,
peer_addr->addr,
peer_addr->sockaddr,
datagram_reply);
if (ret == -1) {
*reply = data_blob(NULL, 0);
return False;
}
if (k5_reply.length) {
*reply = data_blob_talloc(mem_ctx, k5_reply.data, k5_reply.length);
krb5_free_data_contents(kdc->smb_krb5_context->krb5_context, &k5_reply);
} else {
*reply = data_blob(NULL, 0);
}
return True;
}
/*
called when we get a new connection
*/
static void kdc_tcp_generic_accept(struct stream_connection *conn, kdc_process_fn_t process_fn)
{
struct kdc_server *kdc = talloc_get_type(conn->private, struct kdc_server);
struct kdc_tcp_connection *kdcconn;
kdcconn = talloc_zero(conn, struct kdc_tcp_connection);
if (!kdcconn) {
stream_terminate_connection(conn, "kdc_tcp_accept: out of memory");
return;
}
kdcconn->conn = conn;
kdcconn->kdc = kdc;
kdcconn->process = process_fn;
conn->private = kdcconn;
kdcconn->packet = packet_init(kdcconn);
if (kdcconn->packet == NULL) {
kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_accept: out of memory");
return;
}
packet_set_private(kdcconn->packet, kdcconn);
packet_set_socket(kdcconn->packet, conn->socket);
packet_set_callback(kdcconn->packet, kdc_tcp_recv);
packet_set_full_request(kdcconn->packet, packet_full_request_u32);
packet_set_error_handler(kdcconn->packet, kdc_tcp_recv_error);
packet_set_event_context(kdcconn->packet, conn->event.ctx);
packet_set_fde(kdcconn->packet, conn->event.fde);
packet_set_serialise(kdcconn->packet);
}
static void kdc_tcp_accept(struct stream_connection *conn)
{
kdc_tcp_generic_accept(conn, kdc_process);
}
static const struct stream_server_ops kdc_tcp_stream_ops = {
.name = "kdc_tcp",
.accept_connection = kdc_tcp_accept,
.recv_handler = kdc_tcp_recv_handler,
.send_handler = kdc_tcp_send
};
static void kpasswdd_tcp_accept(struct stream_connection *conn)
{
kdc_tcp_generic_accept(conn, kpasswdd_process);
}
static const struct stream_server_ops kpasswdd_tcp_stream_ops = {
.name = "kpasswdd_tcp",
.accept_connection = kpasswdd_tcp_accept,
.recv_handler = kdc_tcp_recv_handler,
.send_handler = kdc_tcp_send
};
/*
start listening on the given address
*/
static NTSTATUS kdc_add_socket(struct kdc_server *kdc, const char *address)
{
const struct model_ops *model_ops;
struct kdc_socket *kdc_socket;
struct kdc_socket *kpasswd_socket;
struct socket_address *kdc_address, *kpasswd_address;
NTSTATUS status;
uint16_t kdc_port = lp_krb5_port();
uint16_t kpasswd_port = lp_kpasswd_port();
kdc_socket = talloc(kdc, struct kdc_socket);
NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
kpasswd_socket = talloc(kdc, struct kdc_socket);
NT_STATUS_HAVE_NO_MEMORY(kpasswd_socket);
status = socket_create("ip", SOCKET_TYPE_DGRAM, &kdc_socket->sock, 0);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(kdc_socket);
return status;
}
status = socket_create("ip", SOCKET_TYPE_DGRAM, &kpasswd_socket->sock, 0);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(kpasswd_socket);
return status;
}
kdc_socket->kdc = kdc;
kdc_socket->send_queue = NULL;
kdc_socket->process = kdc_process;
talloc_steal(kdc_socket, kdc_socket->sock);
kdc_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
socket_get_fd(kdc_socket->sock), EVENT_FD_READ,
kdc_socket_handler, kdc_socket);
kdc_address = socket_address_from_strings(kdc_socket, kdc_socket->sock->backend_name,
address, kdc_port);
NT_STATUS_HAVE_NO_MEMORY(kdc_address);
status = socket_listen(kdc_socket->sock, kdc_address, 0, 0);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("Failed to bind to %s:%d UDP for kdc - %s\n",
address, kdc_port, nt_errstr(status)));
talloc_free(kdc_socket);
return status;
}
kpasswd_socket->kdc = kdc;
kpasswd_socket->send_queue = NULL;
kpasswd_socket->process = kpasswdd_process;
talloc_steal(kpasswd_socket, kpasswd_socket->sock);
kpasswd_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
socket_get_fd(kpasswd_socket->sock), EVENT_FD_READ,
kdc_socket_handler, kpasswd_socket);
kpasswd_address = socket_address_from_strings(kpasswd_socket, kpasswd_socket->sock->backend_name,
address, kpasswd_port);
NT_STATUS_HAVE_NO_MEMORY(kpasswd_address);
status = socket_listen(kpasswd_socket->sock, kpasswd_address, 0, 0);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("Failed to bind to %s:%d UDP for kpasswd - %s\n",
address, kpasswd_port, nt_errstr(status)));
talloc_free(kpasswd_socket);
return status;
}
/* within the kdc task we want to be a single process, so
ask for the single process model ops and pass these to the
stream_setup_socket() call. */
model_ops = process_model_byname("single");
if (!model_ops) {
DEBUG(0,("Can't find 'single' process model_ops\n"));
talloc_free(kdc_socket);
return NT_STATUS_INTERNAL_ERROR;
}
status = stream_setup_socket(kdc->task->event_ctx, model_ops,
&kdc_tcp_stream_ops,
"ip", address, &kdc_port, kdc);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
address, kdc_port, nt_errstr(status)));
talloc_free(kdc_socket);
return status;
}
status = stream_setup_socket(kdc->task->event_ctx, model_ops,
&kpasswdd_tcp_stream_ops,
"ip", address, &kpasswd_port, kdc);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
address, kpasswd_port, nt_errstr(status)));
talloc_free(kdc_socket);
return status;
}
return NT_STATUS_OK;
}
/*
setup our listening sockets on the configured network interfaces
*/
static NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc)
{
int num_interfaces = iface_count();
TALLOC_CTX *tmp_ctx = talloc_new(kdc);
NTSTATUS status;
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;
}
static struct krb5plugin_windc_ftable windc_plugin_table = {
.minor_version = KRB5_WINDC_PLUGING_MINOR,
.init = samba_kdc_plugin_init,
.fini = samba_kdc_plugin_fini,
.pac_generate = samba_kdc_get_pac,
.pac_verify = samba_kdc_reget_pac,
.client_access = samba_kdc_check_client_access,
};
/*
startup the kdc task
*/
static void kdc_task_init(struct task_server *task)
{
struct kdc_server *kdc;
NTSTATUS status;
krb5_error_code ret;
switch (lp_server_role()) {
case ROLE_STANDALONE:
task_server_terminate(task, "kdc: no KDC required in standalone configuration");
return;
case ROLE_DOMAIN_MEMBER:
task_server_terminate(task, "kdc: no KDC required in member server configuration");
return;
case ROLE_DOMAIN_CONTROLLER:
/* Yes, we want a KDC */
break;
}
if (iface_count() == 0) {
task_server_terminate(task, "kdc: no network interfaces configured");
return;
}
task_server_set_title(task, "task[kdc]");
kdc = talloc(task, struct kdc_server);
if (kdc == NULL) {
task_server_terminate(task, "kdc: out of memory");
return;
}
kdc->task = task;
initialize_krb5_error_table();
ret = smb_krb5_init_context(kdc, &kdc->smb_krb5_context);
if (ret) {
DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n",
error_message(ret)));
task_server_terminate(task, "kdc: krb5_init_context failed");
return;
}
krb5_add_et_list(kdc->smb_krb5_context->krb5_context, initialize_hdb_error_table_r);
/* Registar WinDC hooks */
ret = _krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
PLUGIN_TYPE_DATA, "windc",
&windc_plugin_table);
if(ret) {
task_server_terminate(task, "kdc: failed to register hdb keytab");
return;
}
/* Setup the KDC configuration */
kdc->config = talloc(kdc, krb5_kdc_configuration);
if (!kdc->config) {
task_server_terminate(task, "kdc: out of memory");
return;
}
krb5_kdc_default_config(kdc->config);
kdc->config->logf = kdc->smb_krb5_context->logf;
kdc->config->db = talloc(kdc->config, struct HDB *);
if (!kdc->config->db) {
task_server_terminate(task, "kdc: out of memory");
return;
}
kdc->config->num_db = 1;
status = kdc_hdb_ldb_create(kdc, kdc->smb_krb5_context->krb5_context,
&kdc->config->db[0], NULL);
if (!NT_STATUS_IS_OK(status)) {
task_server_terminate(task, "kdc: hdb_ldb_create (setup KDC database) failed");
return;
}
ret = krb5_kt_register(kdc->smb_krb5_context->krb5_context, &hdb_kt_ops);
if(ret) {
task_server_terminate(task, "kdc: failed to register hdb keytab");
return;
}
krb5_kdc_configure(kdc->smb_krb5_context->krb5_context, kdc->config);
kdc_mem_ctx = kdc->smb_krb5_context;
/* start listening on the configured network interfaces */
status = kdc_startup_interfaces(kdc);
if (!NT_STATUS_IS_OK(status)) {
task_server_terminate(task, "kdc failed to setup interfaces");
return;
}
irpc_add_name(task->msg_ctx, "kdc_server");
}
/*
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);
}