mirror of
https://github.com/samba-team/samba.git
synced 2025-01-12 09:18:10 +03:00
a8e69328bf
the same spot (it has identical TCP sementics).
Andrew Bartlett
(This used to be commit 84d6118e87
)
601 lines
16 KiB
C
601 lines
16 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 2 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, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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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_stream.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 "dlinklist.h"
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#include "lib/messaging/irpc.h"
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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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const char *dest_address;
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int dest_port;
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DATA_BLOB packet;
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};
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/*
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top level context structure for the kdc server
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*/
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struct kdc_server {
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struct task_server *task;
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krb5_kdc_configuration *config;
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struct smb_krb5_context *smb_krb5_context;
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};
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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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int (*process)(krb5_context context,
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krb5_kdc_configuration *config,
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unsigned char *buf,
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size_t len,
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krb5_data *reply,
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const char *from,
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struct sockaddr *addr);
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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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/* the partial data we've receiced yet */
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DATA_BLOB partial;
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/* the amount that we used yet from the partial buffer */
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uint32_t partial_read;
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/* prevent loops when we use half async code, while processing a requuest */
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BOOL processing;
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/* a queue of outgoing replies that have been deferred */
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struct data_blob_list_item *send_queue;
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int (*process)(krb5_context context,
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krb5_kdc_configuration *config,
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unsigned char *buf,
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size_t len,
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krb5_data *reply,
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const char *from,
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struct sockaddr *addr);
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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, 0,
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rep->dest_address, rep->dest_port);
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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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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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krb5_data reply;
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size_t nread, dsize;
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const char *src_addr;
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int src_port;
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struct sockaddr_in src_sock_addr;
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struct ipv4_addr 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(kdc_socket, 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, 0,
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&src_addr, &src_port);
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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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talloc_steal(tmp_ctx, src_addr);
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blob.length = nread;
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DEBUG(2,("Received krb5 UDP packet of length %u from %s:%u\n",
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blob.length, src_addr, (uint16_t)src_port));
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/* TODO: This really should be in a utility function somewhere */
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ZERO_STRUCT(src_sock_addr);
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#ifdef HAVE_SOCK_SIN_LEN
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src_sock_addr.sin_len = sizeof(src_sock_addr);
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#endif
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addr = interpret_addr2(src_addr);
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src_sock_addr.sin_addr.s_addr = addr.addr;
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src_sock_addr.sin_port = htons(src_port);
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src_sock_addr.sin_family = PF_INET;
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/* Call krb5 */
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ret = kdc_socket->process(kdc_socket->kdc->smb_krb5_context->krb5_context,
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kdc_socket->kdc->config,
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blob.data, blob.length,
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&reply,
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src_addr,
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(struct sockaddr *)&src_sock_addr);
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if (ret == -1) {
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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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krb5_data_free(&reply);
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talloc_free(tmp_ctx);
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return;
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}
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rep->dest_address = talloc_steal(rep, src_addr);
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rep->dest_port = src_port;
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rep->packet = data_blob_talloc(rep, reply.data, reply.length);
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krb5_data_free(&reply);
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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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called when we get a new connection
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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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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 = krb5_kdc_process_krb5_request;
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conn->private = kdcconn;
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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(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, 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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struct data_blob_list_item *rep;
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krb5_data reply;
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size_t nread;
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const char *src_addr;
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int src_port;
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struct sockaddr_in src_sock_addr;
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struct ipv4_addr addr;
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int ret;
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/* avoid recursion, because of half async code */
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if (kdcconn->processing) {
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EVENT_FD_NOT_READABLE(conn->event.fde);
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return;
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}
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if (kdcconn->partial.length == 0) {
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kdcconn->partial = data_blob_talloc(kdcconn, NULL, 4);
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if (!kdcconn->partial.data) goto nomem;
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kdcconn->partial_read = 0;
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}
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/* read in the packet length */
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if (kdcconn->partial_read < 4) {
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uint32_t packet_length;
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status = socket_recv(conn->socket,
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kdcconn->partial.data + kdcconn->partial_read,
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4 - kdcconn->partial_read,
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&nread, 0);
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if (NT_STATUS_IS_ERR(status)) goto failed;
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if (!NT_STATUS_IS_OK(status)) return;
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kdcconn->partial_read += nread;
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if (kdcconn->partial_read != 4) return;
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packet_length = RIVAL(kdcconn->partial.data, 0) + 4;
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kdcconn->partial.data = talloc_realloc(kdcconn, kdcconn->partial.data,
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uint8_t, packet_length);
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if (!kdcconn->partial.data) goto nomem;
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kdcconn->partial.length = packet_length;
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}
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/* read in the body */
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status = socket_recv(conn->socket,
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kdcconn->partial.data + kdcconn->partial_read,
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kdcconn->partial.length - kdcconn->partial_read,
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&nread, 0);
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if (NT_STATUS_IS_ERR(status)) goto failed;
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if (!NT_STATUS_IS_OK(status)) return;
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kdcconn->partial_read += nread;
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if (kdcconn->partial_read != kdcconn->partial.length) return;
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/*
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* we have parsed the request, so we can reset the kdcconn->partial_read,
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* maybe we could also free kdcconn->partial, but for now we keep it,
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* and overwrite it the next time
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*/
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kdcconn->partial_read = 0;
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src_addr = socket_get_peer_addr(kdcconn->conn->socket, tmp_ctx);
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if (!src_addr) goto nomem;
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src_port = socket_get_peer_port(kdcconn->conn->socket);
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DEBUG(2,("Received krb5 TCP packet of length %u from %s:%u\n",
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kdcconn->partial.length - 4, src_addr, src_port));
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/* TODO: This really should be in a utility function somewhere */
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ZERO_STRUCT(src_sock_addr);
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#ifdef HAVE_SOCK_SIN_LEN
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src_sock_addr.sin_len = sizeof(src_sock_addr);
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#endif
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addr = interpret_addr2(src_addr);
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src_sock_addr.sin_addr.s_addr = addr.addr;
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src_sock_addr.sin_port = htons(src_port);
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src_sock_addr.sin_family = PF_INET;
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/* Call krb5 */
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kdcconn->processing = True;
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ret = kdcconn->process(kdcconn->kdc->smb_krb5_context->krb5_context,
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kdcconn->kdc->config,
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kdcconn->partial.data + 4, kdcconn->partial.length - 4,
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&reply,
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src_addr,
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(struct sockaddr *)&src_sock_addr);
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kdcconn->processing = False;
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if (ret == -1) {
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status = NT_STATUS_INTERNAL_ERROR;
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goto failed;
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}
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/* and now encode the reply */
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rep = talloc(kdcconn, struct data_blob_list_item);
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if (!rep) {
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krb5_data_free(&reply);
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goto nomem;
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}
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rep->blob = data_blob_talloc(rep, NULL, reply.length + 4);
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if (!rep->blob.data) {
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krb5_data_free(&reply);
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goto nomem;
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}
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RSIVAL(rep->blob.data, 0, reply.length);
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memcpy(rep->blob.data + 4, reply.data, reply.length);
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krb5_data_free(&reply);
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if (!kdcconn->send_queue) {
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EVENT_FD_WRITEABLE(kdcconn->conn->event.fde);
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}
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DLIST_ADD_END(kdcconn->send_queue, rep, struct data_blob_list_item *);
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EVENT_FD_READABLE(kdcconn->conn->event.fde);
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/* the call isn't needed any more */
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talloc_free(tmp_ctx);
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return;
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nomem:
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status = NT_STATUS_NO_MEMORY;
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failed:
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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, struct kdc_tcp_connection);
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NTSTATUS status;
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while (kdcconn->send_queue) {
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struct data_blob_list_item *q = kdcconn->send_queue;
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size_t sendlen;
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status = socket_send(conn->socket, &q->blob, &sendlen, 0);
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if (NT_STATUS_IS_ERR(status)) goto failed;
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if (!NT_STATUS_IS_OK(status)) return;
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q->blob.length -= sendlen;
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q->blob.data += sendlen;
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if (q->blob.length == 0) {
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DLIST_REMOVE(kdcconn->send_queue, q);
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talloc_free(q);
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}
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}
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EVENT_FD_NOT_WRITEABLE(conn->event.fde);
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return;
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failed:
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kdc_tcp_terminate_connection(kdcconn, nt_errstr(status));
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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,
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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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{
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const struct model_ops *model_ops;
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struct kdc_socket *kdc_socket;
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NTSTATUS status;
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uint16_t port = lp_krb5_port();
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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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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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kdc_socket->kdc = kdc;
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kdc_socket->send_queue = NULL;
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kdc_socket->process = krb5_kdc_process_krb5_request;
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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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status = socket_listen(kdc_socket->sock, address, port, 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 - %s\n",
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address, 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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/* 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, model_ops, &kdc_tcp_stream_ops,
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"ip", address, &port, kdc);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
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address, 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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return NT_STATUS_OK;
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}
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/*
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setup our listening sockets on the configured network interfaces
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*/
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static NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc)
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{
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int num_interfaces = iface_count();
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TALLOC_CTX *tmp_ctx = talloc_new(kdc);
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NTSTATUS status;
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/* if we are allowing incoming packets from any address, then
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we need to bind to the wildcard address */
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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;
|
|
krb5_error_code ret;
|
|
|
|
if (iface_count() == 0) {
|
|
task_server_terminate(task, "kdc: no network interfaces configured");
|
|
return;
|
|
}
|
|
|
|
kdc = talloc(task, struct kdc_server);
|
|
if (kdc == NULL) {
|
|
task_server_terminate(task, "kdc: out of memory");
|
|
return;
|
|
}
|
|
|
|
kdc->task = task;
|
|
|
|
/* 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);
|
|
|
|
/* NAT and the like make this pointless, and painful */
|
|
kdc->config->check_ticket_addresses = FALSE;
|
|
|
|
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);
|
|
|
|
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;
|
|
|
|
ret = hdb_ldb_create(kdc, kdc->smb_krb5_context->krb5_context,
|
|
&kdc->config->db[0], lp_sam_url());
|
|
if (ret != 0) {
|
|
DEBUG(1, ("kdc_task_init: hdb_ldb_create fails: %s\n",
|
|
smb_get_krb5_error_message(kdc->smb_krb5_context->krb5_context, ret, kdc)));
|
|
task_server_terminate(task, "kdc: hdb_ldb_create failed");
|
|
return;
|
|
}
|
|
|
|
/* 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);
|
|
}
|