2
Unix SMB/CIFS implementation.
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Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2008
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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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#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 "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 "librpc/gen_ndr/ndr_irpc.h"
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#include "librpc/gen_ndr/ndr_krb5pac.h"
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#include "lib/socket/netif.h"
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#include "param/param.h"
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#include "librpc/gen_ndr/ndr_misc.h"
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/* Disgusting hack to get a mem_ctx and lp_ctx into the hdb plugin, when
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TALLOC_CTX *kdc_mem_ctx;
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struct tevent_context *kdc_ev_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 *next, *prev;
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struct socket_address *dest;
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typedef bool (*kdc_process_fn_t)(struct kdc_server *kdc,
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struct socket_address *peer_addr,
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struct socket_address *my_addr,
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/* hold information about one kdc socket */
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struct socket_context *sock;
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struct kdc_server *kdc;
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struct tevent_fd *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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state of an open tcp connection
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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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handle fd send events on a KDC socket
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static void kdc_send_handler(struct kdc_socket *kdc_socket)
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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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status = socket_sendto(kdc_socket->sock, &rep->packet, &sendlen,
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if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
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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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DLIST_REMOVE(kdc_socket->send_queue, rep);
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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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handle fd recv events on a KDC socket
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static void kdc_recv_handler(struct kdc_socket *kdc_socket)
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TALLOC_CTX *tmp_ctx = talloc_new(kdc_socket);
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struct kdc_reply *rep;
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struct socket_address *src;
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struct socket_address *my_addr;
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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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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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status = socket_recvfrom(kdc_socket->sock, blob.data, blob.length, &nread,
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if (!NT_STATUS_IS_OK(status)) {
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talloc_free(tmp_ctx);
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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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talloc_free(tmp_ctx);
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ret = kdc_socket->process(kdc_socket->kdc,
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talloc_free(tmp_ctx);
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/* queue a pending reply */
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rep = talloc(kdc_socket, struct kdc_reply);
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talloc_free(tmp_ctx);
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rep->dest = talloc_steal(rep, src);
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talloc_steal(rep, reply.data);
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if (rep->packet.data == NULL) {
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talloc_free(tmp_ctx);
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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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handle fd events on a KDC socket
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static void kdc_socket_handler(struct tevent_context *ev, struct tevent_fd *fde,
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uint16_t flags, void *private_data)
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struct kdc_socket *kdc_socket = talloc_get_type(private_data, 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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if (flags & EVENT_FD_READ) {
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kdc_recv_handler(kdc_socket);
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static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, const char *reason)
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stream_terminate_connection(kdcconn->conn, reason);
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receive a full packet on a KDC connection
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static NTSTATUS kdc_tcp_recv(void *private_data, DATA_BLOB blob)
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struct kdc_tcp_connection *kdcconn = talloc_get_type(private_data,
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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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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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talloc_free(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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my_addr = socket_get_my_addr(kdcconn->conn->socket, tmp_ctx);
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talloc_free(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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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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0 /* Not datagram */);
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talloc_free(tmp_ctx);
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return NT_STATUS_INTERNAL_ERROR;
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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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talloc_free(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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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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/* the call isn't needed any more */
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talloc_free(tmp_ctx);
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receive some data on a KDC connection
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static void kdc_tcp_recv_handler(struct stream_connection *conn, uint16_t flags)
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struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
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struct kdc_tcp_connection);
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packet_recv(kdcconn->packet);
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called on a tcp recv error
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static void kdc_tcp_recv_error(void *private_data, NTSTATUS status)
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struct kdc_tcp_connection *kdcconn = talloc_get_type(private_data,
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struct kdc_tcp_connection);
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kdc_tcp_terminate_connection(kdcconn, nt_errstr(status));
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called when we can write to a connection
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static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
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struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
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struct kdc_tcp_connection);
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packet_queue_run(kdcconn->packet);
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Wrapper for krb5_kdc_process_krb5_request, converting to/from Samba
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static bool kdc_process(struct kdc_server *kdc,
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struct socket_address *peer_addr,
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struct socket_address *my_addr,
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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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input->data, input->length,
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*reply = data_blob(NULL, 0);
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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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*reply = data_blob(NULL, 0);
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called when we get a new connection
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static void kdc_tcp_generic_accept(struct stream_connection *conn, kdc_process_fn_t process_fn)
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struct kdc_server *kdc = talloc_get_type(conn->private_data, 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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stream_terminate_connection(conn, "kdc_tcp_accept: out of memory");
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kdcconn->conn = conn;
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kdcconn->process = process_fn;
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conn->private_data = 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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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);
382
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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static void kdc_tcp_accept(struct stream_connection *conn)
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kdc_tcp_generic_accept(conn, kdc_process);
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static const struct stream_server_ops kdc_tcp_stream_ops = {
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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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static void kpasswdd_tcp_accept(struct stream_connection *conn)
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kdc_tcp_generic_accept(conn, kpasswdd_process);
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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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start listening on the given address
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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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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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kdc_socket = talloc(kdc, struct kdc_socket);
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NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
427
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);
436
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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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);
452
kdc_address = socket_address_from_strings(kdc_socket, kdc_socket->sock->backend_name,
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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);
457
if (!NT_STATUS_IS_OK(status)) {
458
DEBUG(0,("Failed to bind to %s:%d UDP for kdc - %s\n",
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address, kdc_port, nt_errstr(status)));
460
talloc_free(kdc_socket);
464
kpasswd_socket->kdc = kdc;
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kpasswd_socket->send_queue = NULL;
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kpasswd_socket->process = kpasswdd_process;
468
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,
475
address, kpasswd_port);
476
NT_STATUS_HAVE_NO_MEMORY(kpasswd_address);
478
status = socket_listen(kpasswd_socket->sock, kpasswd_address, 0, 0);
479
if (!NT_STATUS_IS_OK(status)) {
480
DEBUG(0,("Failed to bind to %s:%d UDP for kpasswd - %s\n",
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address, kpasswd_port, nt_errstr(status)));
482
talloc_free(kpasswd_socket);
486
/* within the kdc task we want to be a single process, so
487
ask for the single process model ops and pass these to the
488
stream_setup_socket() call. */
489
model_ops = process_model_startup(kdc->task->event_ctx, "single");
491
DEBUG(0,("Can't find 'single' process model_ops\n"));
492
talloc_free(kdc_socket);
493
return NT_STATUS_INTERNAL_ERROR;
496
status = stream_setup_socket(kdc->task->event_ctx,
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"ip", address, &kdc_port,
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lp_socket_options(kdc->task->lp_ctx),
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if (!NT_STATUS_IS_OK(status)) {
504
DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
505
address, kdc_port, nt_errstr(status)));
506
talloc_free(kdc_socket);
510
status = stream_setup_socket(kdc->task->event_ctx,
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&kpasswdd_tcp_stream_ops,
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"ip", address, &kpasswd_port,
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lp_socket_options(kdc->task->lp_ctx),
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if (!NT_STATUS_IS_OK(status)) {
518
DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
519
address, kpasswd_port, nt_errstr(status)));
520
talloc_free(kdc_socket);
529
setup our listening sockets on the configured network interfaces
531
static NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc, struct loadparm_context *lp_ctx,
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struct interface *ifaces)
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TALLOC_CTX *tmp_ctx = talloc_new(kdc);
539
num_interfaces = iface_count(ifaces);
541
for (i=0; i<num_interfaces; i++) {
542
const char *address = talloc_strdup(tmp_ctx, iface_n_ip(ifaces, i));
543
status = kdc_add_socket(kdc, address, lp_krb5_port(lp_ctx),
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lp_kpasswd_port(lp_ctx));
545
NT_STATUS_NOT_OK_RETURN(status);
548
talloc_free(tmp_ctx);
553
static struct krb5plugin_windc_ftable windc_plugin_table = {
554
.minor_version = KRB5_WINDC_PLUGING_MINOR,
555
.init = samba_kdc_plugin_init,
556
.fini = samba_kdc_plugin_fini,
557
.pac_generate = samba_kdc_get_pac,
558
.pac_verify = samba_kdc_reget_pac,
559
.client_access = samba_kdc_check_client_access,
563
static NTSTATUS kdc_check_generic_kerberos(struct irpc_message *msg,
564
struct kdc_check_generic_kerberos *r)
566
struct PAC_Validate pac_validate;
568
struct PAC_SIGNATURE_DATA kdc_sig;
569
struct kdc_server *kdc = talloc_get_type(msg->private_data, struct kdc_server);
570
enum ndr_err_code ndr_err;
574
krb5_principal principal;
575
krb5_keyblock keyblock;
578
/* There is no reply to this request */
579
r->out.generic_reply = data_blob(NULL, 0);
581
ndr_err = ndr_pull_struct_blob(&r->in.generic_request, msg,
582
lp_iconv_convenience(kdc->task->lp_ctx),
584
(ndr_pull_flags_fn_t)ndr_pull_PAC_Validate);
585
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
586
return NT_STATUS_INVALID_PARAMETER;
589
if (pac_validate.MessageType != 3) {
590
/* We don't implement any other message types - such as certificate validation - yet */
591
return NT_STATUS_INVALID_PARAMETER;
594
if (pac_validate.ChecksumAndSignature.length != (pac_validate.ChecksumLength + pac_validate.SignatureLength)
595
|| pac_validate.ChecksumAndSignature.length < pac_validate.ChecksumLength
596
|| pac_validate.ChecksumAndSignature.length < pac_validate.SignatureLength ) {
597
return NT_STATUS_INVALID_PARAMETER;
600
srv_sig = data_blob_const(pac_validate.ChecksumAndSignature.data,
601
pac_validate.ChecksumLength);
603
if (pac_validate.SignatureType == CKSUMTYPE_HMAC_MD5) {
604
etype = ETYPE_ARCFOUR_HMAC_MD5;
606
ret = krb5_cksumtype_to_enctype(kdc->smb_krb5_context->krb5_context, pac_validate.SignatureType,
609
return NT_STATUS_LOGON_FAILURE;
613
ret = krb5_make_principal(kdc->smb_krb5_context->krb5_context, &principal,
614
lp_realm(kdc->task->lp_ctx),
615
"krbtgt", lp_realm(kdc->task->lp_ctx),
619
return NT_STATUS_NO_MEMORY;
622
ret = kdc->config->db[0]->hdb_fetch(kdc->smb_krb5_context->krb5_context,
625
HDB_F_GET_KRBTGT | HDB_F_DECRYPT,
629
hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
630
krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
632
return NT_STATUS_LOGON_FAILURE;
635
ret = hdb_enctype2key(kdc->smb_krb5_context->krb5_context, &ent.entry, etype, &key);
638
hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
639
krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
640
return NT_STATUS_LOGON_FAILURE;
645
kdc_sig.type = pac_validate.SignatureType;
646
kdc_sig.signature = data_blob_const(&pac_validate.ChecksumAndSignature.data[pac_validate.ChecksumLength],
647
pac_validate.SignatureLength);
648
ret = check_pac_checksum(msg, srv_sig, &kdc_sig,
649
kdc->smb_krb5_context->krb5_context, &keyblock);
651
hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
652
krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
655
return NT_STATUS_LOGON_FAILURE;
662
static struct hdb_method hdb_samba4 = {
663
.interface_version = HDB_INTERFACE_VERSION,
665
.create = hdb_samba4_create
671
static void kdc_task_init(struct task_server *task)
673
struct kdc_server *kdc;
676
struct interface *ifaces;
678
switch (lp_server_role(task->lp_ctx)) {
679
case ROLE_STANDALONE:
680
task_server_terminate(task, "kdc: no KDC required in standalone configuration");
682
case ROLE_DOMAIN_MEMBER:
683
task_server_terminate(task, "kdc: no KDC required in member server configuration");
685
case ROLE_DOMAIN_CONTROLLER:
686
/* Yes, we want a KDC */
690
load_interfaces(task, lp_interfaces(task->lp_ctx), &ifaces);
692
if (iface_count(ifaces) == 0) {
693
task_server_terminate(task, "kdc: no network interfaces configured");
697
task_server_set_title(task, "task[kdc]");
699
kdc = talloc(task, struct kdc_server);
701
task_server_terminate(task, "kdc: out of memory");
707
initialize_krb5_error_table();
709
ret = smb_krb5_init_context(kdc, task->event_ctx, task->lp_ctx, &kdc->smb_krb5_context);
711
DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n",
712
error_message(ret)));
713
task_server_terminate(task, "kdc: krb5_init_context failed");
717
krb5_add_et_list(kdc->smb_krb5_context->krb5_context, initialize_hdb_error_table_r);
719
ret = krb5_kdc_get_config(kdc->smb_krb5_context->krb5_context,
722
task_server_terminate(task, "kdc: failed to get KDC configuration");
726
kdc->config->logf = kdc->smb_krb5_context->logf;
727
kdc->config->db = talloc(kdc, struct HDB *);
728
if (!kdc->config->db) {
729
task_server_terminate(task, "kdc: out of memory");
732
kdc->config->num_db = 1;
734
status = kdc_hdb_samba4_create(kdc, task->event_ctx, task->lp_ctx,
735
kdc->smb_krb5_context->krb5_context,
736
&kdc->config->db[0], NULL);
737
if (!NT_STATUS_IS_OK(status)) {
738
task_server_terminate(task, "kdc: hdb_ldb_create (setup KDC database) failed");
743
/* Register hdb-samba4 hooks */
744
ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
745
PLUGIN_TYPE_DATA, "hdb",
748
task_server_terminate(task, "kdc: failed to register hdb keytab");
752
ret = krb5_kt_register(kdc->smb_krb5_context->krb5_context, &hdb_kt_ops);
754
task_server_terminate(task, "kdc: failed to register hdb keytab");
758
/* Registar WinDC hooks */
759
ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
760
PLUGIN_TYPE_DATA, "windc",
761
&windc_plugin_table);
763
task_server_terminate(task, "kdc: failed to register hdb keytab");
767
krb5_kdc_windc_init(kdc->smb_krb5_context->krb5_context);
769
kdc_mem_ctx = kdc->smb_krb5_context;
770
kdc_ev_ctx = task->event_ctx;
771
kdc_lp_ctx = task->lp_ctx;
773
/* start listening on the configured network interfaces */
774
status = kdc_startup_interfaces(kdc, task->lp_ctx, ifaces);
775
if (!NT_STATUS_IS_OK(status)) {
776
task_server_terminate(task, "kdc failed to setup interfaces");
780
status = IRPC_REGISTER(task->msg_ctx, irpc, KDC_CHECK_GENERIC_KERBEROS,
781
kdc_check_generic_kerberos, kdc);
782
if (!NT_STATUS_IS_OK(status)) {
783
task_server_terminate(task, "nbtd failed to setup monitoring");
787
irpc_add_name(task->msg_ctx, "kdc_server");
791
/* called at smbd startup - register ourselves as a server service */
792
NTSTATUS server_service_kdc_init(void)
794
return register_server_service("kdc", kdc_task_init);