mirror of
https://github.com/samba-team/samba.git
synced 2024-12-24 21:34:56 +03:00
c38c2765d1
(This used to be commit e01c1e87c0
)
671 lines
18 KiB
C
671 lines
18 KiB
C
/*
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Unix SMB/CIFS implementation.
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KDC Server startup
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Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
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Copyright (C) Andrew Tridgell 2005
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Copyright (C) Stefan Metzmacher 2005
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "smbd/service_task.h"
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#include "smbd/service.h"
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#include "smbd/service_stream.h"
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#include "smbd/process_model.h"
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#include "lib/events/events.h"
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#include "lib/socket/socket.h"
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#include "kdc/kdc.h"
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#include "system/network.h"
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#include "lib/util/dlinklist.h"
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#include "lib/messaging/irpc.h"
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#include "lib/stream/packet.h"
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#include "librpc/gen_ndr/samr.h"
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#include "lib/socket/netif.h"
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#include "heimdal/kdc/windc_plugin.h"
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#include "heimdal/lib/krb5/krb5_locl.h"
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#include "heimdal/kdc/kdc_locl.h"
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#include "param/param.h"
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/* Disgusting hack to get a mem_ctx and lp_ctx into the hdb plugin, when
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* used as a keytab */
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TALLOC_CTX *kdc_mem_ctx;
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struct loadparm_context *kdc_lp_ctx;
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/* hold all the info needed to send a reply */
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struct kdc_reply {
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struct kdc_reply *next, *prev;
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struct socket_address *dest;
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DATA_BLOB packet;
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};
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typedef bool (*kdc_process_fn_t)(struct kdc_server *kdc,
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TALLOC_CTX *mem_ctx,
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DATA_BLOB *input,
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DATA_BLOB *reply,
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struct socket_address *peer_addr,
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struct socket_address *my_addr,
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int datagram);
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/* hold information about one kdc socket */
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struct kdc_socket {
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struct socket_context *sock;
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struct kdc_server *kdc;
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struct fd_event *fde;
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/* a queue of outgoing replies that have been deferred */
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struct kdc_reply *send_queue;
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kdc_process_fn_t process;
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};
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/*
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state of an open tcp connection
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*/
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struct kdc_tcp_connection {
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/* stream connection we belong to */
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struct stream_connection *conn;
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/* the kdc_server the connection belongs to */
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struct kdc_server *kdc;
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struct packet_context *packet;
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kdc_process_fn_t process;
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};
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/*
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handle fd send events on a KDC socket
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*/
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static void kdc_send_handler(struct kdc_socket *kdc_socket)
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{
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while (kdc_socket->send_queue) {
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struct kdc_reply *rep = kdc_socket->send_queue;
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NTSTATUS status;
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size_t sendlen;
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status = socket_sendto(kdc_socket->sock, &rep->packet, &sendlen,
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rep->dest);
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if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
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break;
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}
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if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_BUFFER_SIZE)) {
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/* Replace with a krb err, response to big */
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}
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DLIST_REMOVE(kdc_socket->send_queue, rep);
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talloc_free(rep);
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}
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if (kdc_socket->send_queue == NULL) {
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EVENT_FD_NOT_WRITEABLE(kdc_socket->fde);
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}
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}
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/*
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handle fd recv events on a KDC socket
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*/
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static void kdc_recv_handler(struct kdc_socket *kdc_socket)
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{
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NTSTATUS status;
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TALLOC_CTX *tmp_ctx = talloc_new(kdc_socket);
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DATA_BLOB blob;
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struct kdc_reply *rep;
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DATA_BLOB reply;
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size_t nread, dsize;
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struct socket_address *src;
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struct socket_address *my_addr;
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int ret;
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status = socket_pending(kdc_socket->sock, &dsize);
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if (!NT_STATUS_IS_OK(status)) {
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talloc_free(tmp_ctx);
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return;
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}
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blob = data_blob_talloc(tmp_ctx, NULL, dsize);
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if (blob.data == NULL) {
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/* hope this is a temporary low memory condition */
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talloc_free(tmp_ctx);
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return;
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}
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status = socket_recvfrom(kdc_socket->sock, blob.data, blob.length, &nread,
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tmp_ctx, &src);
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if (!NT_STATUS_IS_OK(status)) {
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talloc_free(tmp_ctx);
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return;
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}
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blob.length = nread;
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DEBUG(10,("Received krb5 UDP packet of length %lu from %s:%u\n",
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(long)blob.length, src->addr, (uint16_t)src->port));
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my_addr = socket_get_my_addr(kdc_socket->sock, tmp_ctx);
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if (!my_addr) {
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talloc_free(tmp_ctx);
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return;
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}
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/* Call krb5 */
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ret = kdc_socket->process(kdc_socket->kdc,
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tmp_ctx,
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&blob,
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&reply,
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src, my_addr,
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1 /* Datagram */);
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if (!ret) {
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talloc_free(tmp_ctx);
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return;
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}
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/* queue a pending reply */
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rep = talloc(kdc_socket, struct kdc_reply);
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if (rep == NULL) {
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talloc_free(tmp_ctx);
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return;
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}
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rep->dest = talloc_steal(rep, src);
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rep->packet = reply;
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talloc_steal(rep, reply.data);
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if (rep->packet.data == NULL) {
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talloc_free(rep);
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talloc_free(tmp_ctx);
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return;
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}
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DLIST_ADD_END(kdc_socket->send_queue, rep, struct kdc_reply *);
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EVENT_FD_WRITEABLE(kdc_socket->fde);
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talloc_free(tmp_ctx);
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}
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/*
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handle fd events on a KDC socket
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*/
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static void kdc_socket_handler(struct event_context *ev, struct fd_event *fde,
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uint16_t flags, void *private)
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{
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struct kdc_socket *kdc_socket = talloc_get_type(private, struct kdc_socket);
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if (flags & EVENT_FD_WRITE) {
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kdc_send_handler(kdc_socket);
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}
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if (flags & EVENT_FD_READ) {
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kdc_recv_handler(kdc_socket);
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}
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}
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static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, const char *reason)
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{
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stream_terminate_connection(kdcconn->conn, reason);
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}
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/*
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receive a full packet on a KDC connection
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*/
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static NTSTATUS kdc_tcp_recv(void *private, DATA_BLOB blob)
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{
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struct kdc_tcp_connection *kdcconn = talloc_get_type(private,
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struct kdc_tcp_connection);
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NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
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TALLOC_CTX *tmp_ctx = talloc_new(kdcconn);
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int ret;
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DATA_BLOB input, reply;
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struct socket_address *src_addr;
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struct socket_address *my_addr;
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talloc_steal(tmp_ctx, blob.data);
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src_addr = socket_get_peer_addr(kdcconn->conn->socket, tmp_ctx);
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if (!src_addr) {
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talloc_free(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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my_addr = socket_get_my_addr(kdcconn->conn->socket, tmp_ctx);
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if (!my_addr) {
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talloc_free(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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/* Call krb5 */
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input = data_blob_const(blob.data + 4, blob.length - 4);
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ret = kdcconn->process(kdcconn->kdc,
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tmp_ctx,
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&input,
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&reply,
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src_addr,
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my_addr,
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0 /* Not datagram */);
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if (!ret) {
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talloc_free(tmp_ctx);
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return NT_STATUS_INTERNAL_ERROR;
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}
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/* and now encode the reply */
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blob = data_blob_talloc(kdcconn, NULL, reply.length + 4);
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if (!blob.data) {
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talloc_free(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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RSIVAL(blob.data, 0, reply.length);
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memcpy(blob.data + 4, reply.data, reply.length);
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status = packet_send(kdcconn->packet, blob);
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if (!NT_STATUS_IS_OK(status)) {
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talloc_free(tmp_ctx);
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return status;
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}
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/* the call isn't needed any more */
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talloc_free(tmp_ctx);
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return NT_STATUS_OK;
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}
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/*
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receive some data on a KDC connection
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*/
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static void kdc_tcp_recv_handler(struct stream_connection *conn, uint16_t flags)
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{
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struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private,
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struct kdc_tcp_connection);
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packet_recv(kdcconn->packet);
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}
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/*
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called on a tcp recv error
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*/
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static void kdc_tcp_recv_error(void *private, NTSTATUS status)
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{
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struct kdc_tcp_connection *kdcconn = talloc_get_type(private, struct kdc_tcp_connection);
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kdc_tcp_terminate_connection(kdcconn, nt_errstr(status));
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}
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/*
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called when we can write to a connection
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*/
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static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
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{
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struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private,
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struct kdc_tcp_connection);
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packet_queue_run(kdcconn->packet);
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}
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/**
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Wrapper for krb5_kdc_process_krb5_request, converting to/from Samba
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calling conventions
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*/
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static bool kdc_process(struct kdc_server *kdc,
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TALLOC_CTX *mem_ctx,
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DATA_BLOB *input,
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DATA_BLOB *reply,
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struct socket_address *peer_addr,
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struct socket_address *my_addr,
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int datagram_reply)
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{
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int ret;
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krb5_data k5_reply;
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krb5_data_zero(&k5_reply);
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krb5_kdc_update_time(NULL);
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DEBUG(10,("Received KDC packet of length %lu from %s:%d\n",
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(long)input->length - 4, peer_addr->addr, peer_addr->port));
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ret = krb5_kdc_process_krb5_request(kdc->smb_krb5_context->krb5_context,
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kdc->config,
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input->data, input->length,
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&k5_reply,
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peer_addr->addr,
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peer_addr->sockaddr,
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datagram_reply);
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if (ret == -1) {
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*reply = data_blob(NULL, 0);
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return false;
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}
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if (k5_reply.length) {
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*reply = data_blob_talloc(mem_ctx, k5_reply.data, k5_reply.length);
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krb5_free_data_contents(kdc->smb_krb5_context->krb5_context, &k5_reply);
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} else {
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*reply = data_blob(NULL, 0);
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}
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return true;
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}
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/*
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called when we get a new connection
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*/
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static void kdc_tcp_generic_accept(struct stream_connection *conn, kdc_process_fn_t process_fn)
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{
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struct kdc_server *kdc = talloc_get_type(conn->private, struct kdc_server);
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struct kdc_tcp_connection *kdcconn;
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kdcconn = talloc_zero(conn, struct kdc_tcp_connection);
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if (!kdcconn) {
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stream_terminate_connection(conn, "kdc_tcp_accept: out of memory");
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return;
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}
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kdcconn->conn = conn;
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kdcconn->kdc = kdc;
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kdcconn->process = process_fn;
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conn->private = kdcconn;
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kdcconn->packet = packet_init(kdcconn);
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if (kdcconn->packet == NULL) {
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kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_accept: out of memory");
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return;
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}
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packet_set_private(kdcconn->packet, kdcconn);
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packet_set_socket(kdcconn->packet, conn->socket);
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packet_set_callback(kdcconn->packet, kdc_tcp_recv);
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packet_set_full_request(kdcconn->packet, packet_full_request_u32);
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packet_set_error_handler(kdcconn->packet, kdc_tcp_recv_error);
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packet_set_event_context(kdcconn->packet, conn->event.ctx);
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packet_set_fde(kdcconn->packet, conn->event.fde);
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packet_set_serialise(kdcconn->packet);
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}
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static void kdc_tcp_accept(struct stream_connection *conn)
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{
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kdc_tcp_generic_accept(conn, kdc_process);
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}
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static const struct stream_server_ops kdc_tcp_stream_ops = {
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.name = "kdc_tcp",
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.accept_connection = kdc_tcp_accept,
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.recv_handler = kdc_tcp_recv_handler,
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.send_handler = kdc_tcp_send
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};
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static void kpasswdd_tcp_accept(struct stream_connection *conn)
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{
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kdc_tcp_generic_accept(conn, kpasswdd_process);
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}
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static const struct stream_server_ops kpasswdd_tcp_stream_ops = {
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.name = "kpasswdd_tcp",
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.accept_connection = kpasswdd_tcp_accept,
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.recv_handler = kdc_tcp_recv_handler,
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.send_handler = kdc_tcp_send
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};
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/*
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start listening on the given address
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*/
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static NTSTATUS kdc_add_socket(struct kdc_server *kdc, const char *address,
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uint16_t kdc_port, uint16_t kpasswd_port)
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{
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const struct model_ops *model_ops;
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struct kdc_socket *kdc_socket;
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struct kdc_socket *kpasswd_socket;
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struct socket_address *kdc_address, *kpasswd_address;
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NTSTATUS status;
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kdc_socket = talloc(kdc, struct kdc_socket);
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NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
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kpasswd_socket = talloc(kdc, struct kdc_socket);
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NT_STATUS_HAVE_NO_MEMORY(kpasswd_socket);
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status = socket_create("ip", SOCKET_TYPE_DGRAM, &kdc_socket->sock, 0);
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if (!NT_STATUS_IS_OK(status)) {
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talloc_free(kdc_socket);
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return status;
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}
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status = socket_create("ip", SOCKET_TYPE_DGRAM, &kpasswd_socket->sock, 0);
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if (!NT_STATUS_IS_OK(status)) {
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talloc_free(kpasswd_socket);
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return status;
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}
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kdc_socket->kdc = kdc;
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kdc_socket->send_queue = NULL;
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kdc_socket->process = kdc_process;
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talloc_steal(kdc_socket, kdc_socket->sock);
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kdc_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
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socket_get_fd(kdc_socket->sock), EVENT_FD_READ,
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kdc_socket_handler, kdc_socket);
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kdc_address = socket_address_from_strings(kdc_socket, kdc_socket->sock->backend_name,
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address, kdc_port);
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NT_STATUS_HAVE_NO_MEMORY(kdc_address);
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status = socket_listen(kdc_socket->sock, kdc_address, 0, 0);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(0,("Failed to bind to %s:%d UDP for kdc - %s\n",
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address, kdc_port, nt_errstr(status)));
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talloc_free(kdc_socket);
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return status;
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}
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kpasswd_socket->kdc = kdc;
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kpasswd_socket->send_queue = NULL;
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kpasswd_socket->process = kpasswdd_process;
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talloc_steal(kpasswd_socket, kpasswd_socket->sock);
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kpasswd_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
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socket_get_fd(kpasswd_socket->sock), EVENT_FD_READ,
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kdc_socket_handler, kpasswd_socket);
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kpasswd_address = socket_address_from_strings(kpasswd_socket, kpasswd_socket->sock->backend_name,
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address, kpasswd_port);
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NT_STATUS_HAVE_NO_MEMORY(kpasswd_address);
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status = socket_listen(kpasswd_socket->sock, kpasswd_address, 0, 0);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(0,("Failed to bind to %s:%d UDP for kpasswd - %s\n",
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address, kpasswd_port, nt_errstr(status)));
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talloc_free(kpasswd_socket);
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return status;
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}
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/* within the kdc task we want to be a single process, so
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ask for the single process model ops and pass these to the
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stream_setup_socket() call. */
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model_ops = process_model_byname("single");
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if (!model_ops) {
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DEBUG(0,("Can't find 'single' process model_ops\n"));
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talloc_free(kdc_socket);
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return NT_STATUS_INTERNAL_ERROR;
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}
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status = stream_setup_socket(kdc->task->event_ctx,
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kdc->task->lp_ctx,
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model_ops,
|
|
&kdc_tcp_stream_ops,
|
|
"ip", address, &kdc_port,
|
|
lp_socket_options(kdc->task->lp_ctx),
|
|
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,
|
|
kdc->task->lp_ctx,
|
|
model_ops,
|
|
&kpasswdd_tcp_stream_ops,
|
|
"ip", address, &kpasswd_port,
|
|
lp_socket_options(kdc->task->lp_ctx),
|
|
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, struct loadparm_context *lp_ctx,
|
|
struct interface *ifaces)
|
|
{
|
|
int num_interfaces;
|
|
TALLOC_CTX *tmp_ctx = talloc_new(kdc);
|
|
NTSTATUS status;
|
|
int i;
|
|
|
|
num_interfaces = iface_count(ifaces);
|
|
|
|
for (i=0; i<num_interfaces; i++) {
|
|
const char *address = talloc_strdup(tmp_ctx, iface_n_ip(ifaces, i));
|
|
status = kdc_add_socket(kdc, address, lp_krb5_port(lp_ctx),
|
|
lp_kpasswd_port(lp_ctx));
|
|
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;
|
|
struct interface *ifaces;
|
|
|
|
switch (lp_server_role(task->lp_ctx)) {
|
|
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;
|
|
}
|
|
|
|
load_interfaces(task, lp_interfaces(task->lp_ctx), &ifaces);
|
|
|
|
if (iface_count(ifaces) == 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, task->event_ctx, task->lp_ctx, &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);
|
|
|
|
ret = krb5_kdc_get_config(kdc->smb_krb5_context->krb5_context,
|
|
&kdc->config);
|
|
if(ret) {
|
|
task_server_terminate(task, "kdc: failed to get KDC configuration");
|
|
return;
|
|
}
|
|
|
|
kdc->config->logf = kdc->smb_krb5_context->logf;
|
|
kdc->config->db = talloc(kdc, 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, task->lp_ctx,
|
|
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;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
krb5_kdc_windc_init(kdc->smb_krb5_context->krb5_context);
|
|
|
|
kdc_mem_ctx = kdc->smb_krb5_context;
|
|
kdc_lp_ctx = task->lp_ctx;
|
|
|
|
/* start listening on the configured network interfaces */
|
|
status = kdc_startup_interfaces(kdc, task->lp_ctx, ifaces);
|
|
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 at smbd startup - register ourselves as a server service */
|
|
NTSTATUS server_service_kdc_init(void)
|
|
{
|
|
return register_server_service("kdc", kdc_task_init);
|
|
}
|