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878 lines
19 KiB
878 lines
19 KiB
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Jay Sorg 2004-2013
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* mcs layer
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*/
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#include "libxrdp.h"
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#include "log.h"
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/*****************************************************************************/
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struct xrdp_mcs *APP_CC
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xrdp_mcs_create(struct xrdp_sec *owner, struct trans *trans,
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struct stream *client_mcs_data,
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struct stream *server_mcs_data)
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{
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struct xrdp_mcs *self;
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DEBUG((" in xrdp_mcs_create"));
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self = (struct xrdp_mcs *)g_malloc(sizeof(struct xrdp_mcs), 1);
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self->sec_layer = owner;
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self->userid = 1;
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self->chanid = 1001;
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self->client_mcs_data = client_mcs_data;
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self->server_mcs_data = server_mcs_data;
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self->iso_layer = xrdp_iso_create(self, trans);
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self->channel_list = list_create();
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DEBUG((" out xrdp_mcs_create"));
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return self;
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}
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/*****************************************************************************/
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void APP_CC
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xrdp_mcs_delete(struct xrdp_mcs *self)
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{
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struct mcs_channel_item *channel_item;
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int index;
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int count;
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if (self == 0)
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{
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return;
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}
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/* here we have to free the channel items and anything in them */
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count = self->channel_list->count;
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for (index = count - 1; index >= 0; index--)
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{
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channel_item = (struct mcs_channel_item *)
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list_get_item(self->channel_list, index);
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g_free(channel_item);
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}
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list_delete(self->channel_list);
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xrdp_iso_delete(self->iso_layer);
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/* make sure we get null pointer exception if struct is used again. */
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DEBUG(("xrdp_mcs_delete processed"))
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g_memset(self, 0, sizeof(struct xrdp_mcs)) ;
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g_free(self);
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}
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/*****************************************************************************/
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/* This function sends channel join confirm*/
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/* returns error = 1 ok = 0*/
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static int APP_CC
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xrdp_mcs_send_cjcf(struct xrdp_mcs *self, int userid, int chanid)
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{
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struct stream *s;
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DEBUG((" in xrdp_mcs_send_cjcf"));
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make_stream(s);
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init_stream(s, 8192);
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if (xrdp_iso_init(self->iso_layer, s) != 0)
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{
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free_stream(s);
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DEBUG((" out xrdp_mcs_send_cjcf error"));
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return 1;
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}
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out_uint8(s, (MCS_CJCF << 2) | 2);
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out_uint8(s, 0);
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out_uint16_be(s, userid);
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out_uint16_be(s, chanid); /* TODO Explain why we send this two times */
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out_uint16_be(s, chanid);
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s_mark_end(s);
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if (xrdp_iso_send(self->iso_layer, s) != 0)
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{
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free_stream(s);
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DEBUG((" out xrdp_mcs_send_cjcf error"));
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return 1;
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}
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free_stream(s);
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DEBUG((" out xrdp_mcs_send_cjcf"));
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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int APP_CC
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xrdp_mcs_recv(struct xrdp_mcs *self, struct stream *s, int *chan)
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{
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int appid;
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int opcode;
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int len;
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int userid;
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int chanid;
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DEBUG((" in xrdp_mcs_recv"));
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while (1)
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{
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if (xrdp_iso_recv(self->iso_layer, s) != 0)
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{
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DEBUG((" out xrdp_mcs_recv xrdp_iso_recv returned non zero"));
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return 1;
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}
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in_uint8(s, opcode);
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appid = opcode >> 2;
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if (appid == MCS_DPUM) /* Disconnect Provider Ultimatum */
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{
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g_writeln("received Disconnect Provider Ultimatum");
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DEBUG((" out xrdp_mcs_recv appid != MCS_DPUM"));
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return 1;
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}
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/* this is channels getting added from the client */
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if (appid == MCS_CJRQ)
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{
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in_uint16_be(s, userid);
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in_uint16_be(s, chanid);
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log_message(LOG_LEVEL_DEBUG,"MCS_CJRQ - channel join request received");
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DEBUG(("xrdp_mcs_recv adding channel %4.4x", chanid));
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if (xrdp_mcs_send_cjcf(self, userid, chanid) != 0)
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{
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log_message(LOG_LEVEL_ERROR,"Non handled error from xrdp_mcs_send_cjcf") ;
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}
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continue;
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}
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if (appid == MCS_SDRQ || appid == MCS_SDIN)
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{
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break ;
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}
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else
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{
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log_message(LOG_LEVEL_DEBUG,"Recieved an unhandled appid:%d",appid);
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}
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break;
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}
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if (appid != MCS_SDRQ)
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{
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DEBUG((" out xrdp_mcs_recv err got 0x%x need MCS_SDRQ", appid));
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return 1;
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}
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in_uint8s(s, 2);
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in_uint16_be(s, *chan);
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in_uint8s(s, 1);
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in_uint8(s, len);
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if (len & 0x80)
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{
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in_uint8s(s, 1);
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}
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DEBUG((" out xrdp_mcs_recv"));
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_ber_parse_header(struct xrdp_mcs *self, struct stream *s,
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int tag_val, int *len)
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{
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int tag;
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int l;
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int i;
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if (tag_val > 0xff)
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{
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in_uint16_be(s, tag);
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}
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else
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{
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in_uint8(s, tag);
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}
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if (tag != tag_val)
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{
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return 1;
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}
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in_uint8(s, l);
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if (l & 0x80)
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{
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l = l & ~0x80;
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*len = 0;
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while (l > 0)
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{
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in_uint8(s, i);
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*len = (*len << 8) | i;
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l--;
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}
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}
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else
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{
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*len = l;
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}
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if (s_check(s))
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{
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return 0;
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}
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else
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{
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return 1;
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}
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_parse_domain_params(struct xrdp_mcs *self, struct stream *s)
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{
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int len;
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if (xrdp_mcs_ber_parse_header(self, s, MCS_TAG_DOMAIN_PARAMS, &len) != 0)
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{
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return 1;
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}
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in_uint8s(s, len);
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if (s_check(s))
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{
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return 0;
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}
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else
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{
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return 1;
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}
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_recv_connect_initial(struct xrdp_mcs *self)
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{
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int len;
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struct stream *s;
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make_stream(s);
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init_stream(s, 8192);
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if (xrdp_iso_recv(self->iso_layer, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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if (xrdp_mcs_ber_parse_header(self, s, MCS_CONNECT_INITIAL, &len) != 0)
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{
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free_stream(s);
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return 1;
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}
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if (xrdp_mcs_ber_parse_header(self, s, BER_TAG_OCTET_STRING, &len) != 0)
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{
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free_stream(s);
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return 1;
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}
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in_uint8s(s, len);
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if (xrdp_mcs_ber_parse_header(self, s, BER_TAG_OCTET_STRING, &len) != 0)
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{
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free_stream(s);
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return 1;
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}
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in_uint8s(s, len);
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if (xrdp_mcs_ber_parse_header(self, s, BER_TAG_BOOLEAN, &len) != 0)
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{
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free_stream(s);
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return 1;
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}
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in_uint8s(s, len);
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if (xrdp_mcs_parse_domain_params(self, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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if (xrdp_mcs_parse_domain_params(self, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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if (xrdp_mcs_parse_domain_params(self, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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if (xrdp_mcs_ber_parse_header(self, s, BER_TAG_OCTET_STRING, &len) != 0)
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{
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free_stream(s);
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return 1;
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}
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/* make a copy of client mcs data */
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init_stream(self->client_mcs_data, len);
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out_uint8a(self->client_mcs_data, s->p, len);
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in_uint8s(s, len);
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s_mark_end(self->client_mcs_data);
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if (s_check_end(s))
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{
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free_stream(s);
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return 0;
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}
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else
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{
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free_stream(s);
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return 1;
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}
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_recv_edrq(struct xrdp_mcs *self)
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{
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int opcode;
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struct stream *s;
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make_stream(s);
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init_stream(s, 8192);
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if (xrdp_iso_recv(self->iso_layer, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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in_uint8(s, opcode);
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if ((opcode >> 2) != MCS_EDRQ)
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{
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free_stream(s);
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return 1;
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}
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in_uint8s(s, 2);
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in_uint8s(s, 2);
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if (opcode & 2)
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{
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in_uint16_be(s, self->userid);
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}
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if (!(s_check_end(s)))
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{
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free_stream(s);
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return 1;
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}
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free_stream(s);
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_recv_aurq(struct xrdp_mcs *self)
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{
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int opcode;
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struct stream *s;
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make_stream(s);
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init_stream(s, 8192);
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if (xrdp_iso_recv(self->iso_layer, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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in_uint8(s, opcode);
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if ((opcode >> 2) != MCS_AURQ)
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{
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free_stream(s);
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return 1;
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}
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if (opcode & 2)
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{
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in_uint16_be(s, self->userid);
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}
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if (!(s_check_end(s)))
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{
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free_stream(s);
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return 1;
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}
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free_stream(s);
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_send_aucf(struct xrdp_mcs *self)
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{
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struct stream *s;
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DEBUG((" in xrdp_mcs_send_aucf"));
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make_stream(s);
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init_stream(s, 8192);
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if (xrdp_iso_init(self->iso_layer, s) != 0)
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{
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free_stream(s);
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DEBUG((" out xrdp_mcs_send_aucf error"));
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return 1;
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}
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out_uint8(s, ((MCS_AUCF << 2) | 2));
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out_uint8s(s, 1);
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out_uint16_be(s, self->userid);
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s_mark_end(s);
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if (xrdp_iso_send(self->iso_layer, s) != 0)
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{
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free_stream(s);
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DEBUG((" out xrdp_mcs_send_aucf error"));
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return 1;
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}
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free_stream(s);
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DEBUG((" out xrdp_mcs_send_aucf"));
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_recv_cjrq(struct xrdp_mcs *self)
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{
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int opcode;
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struct stream *s;
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make_stream(s);
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init_stream(s, 8192);
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if (xrdp_iso_recv(self->iso_layer, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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in_uint8(s, opcode);
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if ((opcode >> 2) != MCS_CJRQ)
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{
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free_stream(s);
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return 1;
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}
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in_uint8s(s, 4);
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if (opcode & 2)
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{
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in_uint8s(s, 2);
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}
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if (!(s_check_end(s)))
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{
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free_stream(s);
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return 1;
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}
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free_stream(s);
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_ber_out_header(struct xrdp_mcs *self, struct stream *s,
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int tag_val, int len)
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{
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if (tag_val > 0xff)
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{
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out_uint16_be(s, tag_val);
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}
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else
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{
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out_uint8(s, tag_val);
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}
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if (len >= 0x80)
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{
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out_uint8(s, 0x82);
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out_uint16_be(s, len);
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}
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else
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{
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out_uint8(s, len);
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}
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_ber_out_int8(struct xrdp_mcs *self, struct stream *s, int value)
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{
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xrdp_mcs_ber_out_header(self, s, BER_TAG_INTEGER, 1);
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out_uint8(s, value);
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return 0;
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}
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#if 0 /* not used */
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_ber_out_int16(struct xrdp_mcs *self, struct stream *s, int value)
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{
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xrdp_mcs_ber_out_header(self, s, BER_TAG_INTEGER, 2);
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out_uint8(s, (value >> 8));
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out_uint8(s, value);
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return 0;
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}
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#endif
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_ber_out_int24(struct xrdp_mcs *self, struct stream *s, int value)
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{
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xrdp_mcs_ber_out_header(self, s, BER_TAG_INTEGER, 3);
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out_uint8(s, (value >> 16));
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out_uint8(s, (value >> 8));
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out_uint8(s, value);
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_out_domain_params(struct xrdp_mcs *self, struct stream *s,
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int max_channels,
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int max_users, int max_tokens,
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int max_pdu_size)
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{
|
|
xrdp_mcs_ber_out_header(self, s, MCS_TAG_DOMAIN_PARAMS, 26);
|
|
xrdp_mcs_ber_out_int8(self, s, max_channels);
|
|
xrdp_mcs_ber_out_int8(self, s, max_users);
|
|
xrdp_mcs_ber_out_int8(self, s, max_tokens);
|
|
xrdp_mcs_ber_out_int8(self, s, 1);
|
|
xrdp_mcs_ber_out_int8(self, s, 0);
|
|
xrdp_mcs_ber_out_int8(self, s, 1);
|
|
xrdp_mcs_ber_out_int24(self, s, max_pdu_size);
|
|
xrdp_mcs_ber_out_int8(self, s, 2);
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
static int APP_CC
|
|
xrdp_mcs_send_connect_response(struct xrdp_mcs *self)
|
|
{
|
|
int data_len;
|
|
struct stream *s;
|
|
|
|
DEBUG((" in xrdp_mcs_send_connect_response"));
|
|
make_stream(s);
|
|
init_stream(s, 8192);
|
|
data_len = self->server_mcs_data->end - self->server_mcs_data->data;
|
|
xrdp_iso_init(self->iso_layer, s);
|
|
xrdp_mcs_ber_out_header(self, s, MCS_CONNECT_RESPONSE, data_len + 38);
|
|
xrdp_mcs_ber_out_header(self, s, BER_TAG_RESULT, 1);
|
|
out_uint8(s, 0);
|
|
xrdp_mcs_ber_out_header(self, s, BER_TAG_INTEGER, 1);
|
|
out_uint8(s, 0);
|
|
xrdp_mcs_out_domain_params(self, s, 22, 3, 0, 0xfff8);
|
|
xrdp_mcs_ber_out_header(self, s, BER_TAG_OCTET_STRING, data_len);
|
|
/* mcs data */
|
|
out_uint8a(s, self->server_mcs_data->data, data_len);
|
|
s_mark_end(s);
|
|
|
|
if (xrdp_iso_send(self->iso_layer, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
DEBUG((" out xrdp_mcs_send_connect_response error"));
|
|
return 1;
|
|
}
|
|
|
|
free_stream(s);
|
|
DEBUG((" out xrdp_mcs_send_connect_response"));
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
int APP_CC
|
|
xrdp_mcs_incoming(struct xrdp_mcs *self)
|
|
{
|
|
DEBUG((" in xrdp_mcs_incoming"));
|
|
|
|
if (xrdp_iso_incoming(self->iso_layer) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
if (xrdp_mcs_recv_connect_initial(self) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/* in xrdp_sec.c */
|
|
if (xrdp_sec_process_mcs_data(self->sec_layer) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/* in xrdp_sec.c */
|
|
if (xrdp_sec_out_mcs_data(self->sec_layer) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
if (xrdp_mcs_send_connect_response(self) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
if (xrdp_mcs_recv_edrq(self) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
if (xrdp_mcs_recv_aurq(self) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
if (xrdp_mcs_send_aucf(self) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
if (xrdp_mcs_recv_cjrq(self) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
if (xrdp_mcs_send_cjcf(self, self->userid,
|
|
self->userid + MCS_USERCHANNEL_BASE) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
if (xrdp_mcs_recv_cjrq(self) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
if (xrdp_mcs_send_cjcf(self, self->userid, MCS_GLOBAL_CHANNEL) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
DEBUG((" out xrdp_mcs_incoming"));
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
int APP_CC
|
|
xrdp_mcs_init(struct xrdp_mcs *self, struct stream *s)
|
|
{
|
|
xrdp_iso_init(self->iso_layer, s);
|
|
s_push_layer(s, mcs_hdr, 8);
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
/* Inform the callback that an mcs packet has been sent. This is needed so
|
|
the module can send any high priority mcs packets like audio. */
|
|
static int APP_CC
|
|
xrdp_mcs_call_callback(struct xrdp_mcs *self)
|
|
{
|
|
int rv;
|
|
struct xrdp_session *session;
|
|
|
|
rv = 0;
|
|
/* if there is a callback, call it here */
|
|
session = self->sec_layer->rdp_layer->session;
|
|
|
|
if (session != 0)
|
|
{
|
|
if (session->callback != 0)
|
|
{
|
|
/* in xrdp_wm.c */
|
|
rv = session->callback(session->id, 0x5556, 0, 0, 0, 0);
|
|
}
|
|
else
|
|
{
|
|
g_writeln("in xrdp_mcs_send, session->callback is nil");
|
|
}
|
|
}
|
|
else
|
|
{
|
|
g_writeln("in xrdp_mcs_send, session is nil");
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
int APP_CC
|
|
xrdp_mcs_send(struct xrdp_mcs *self, struct stream *s, int chan)
|
|
{
|
|
int len;
|
|
char *lp;
|
|
//static int max_len = 0;
|
|
|
|
DEBUG((" in xrdp_mcs_send"));
|
|
s_pop_layer(s, mcs_hdr);
|
|
len = (s->end - s->p) - 8;
|
|
|
|
if (len > 8192 * 2)
|
|
{
|
|
g_writeln("error in xrdp_mcs_send, size too bog, its %d", len);
|
|
}
|
|
|
|
//if (len > max_len)
|
|
//{
|
|
// max_len = len;
|
|
// g_printf("mcs max length is %d\r\n", max_len);
|
|
//}
|
|
//g_printf("mcs length %d max length is %d\r\n", len, max_len);
|
|
//g_printf("mcs length %d\r\n", len);
|
|
out_uint8(s, MCS_SDIN << 2);
|
|
out_uint16_be(s, self->userid);
|
|
out_uint16_be(s, chan);
|
|
out_uint8(s, 0x70);
|
|
|
|
if (len >= 128)
|
|
{
|
|
len = len | 0x8000;
|
|
out_uint16_be(s, len);
|
|
}
|
|
else
|
|
{
|
|
out_uint8(s, len);
|
|
/* move everything up one byte */
|
|
lp = s->p;
|
|
|
|
while (lp < s->end)
|
|
{
|
|
lp[0] = lp[1];
|
|
lp++;
|
|
}
|
|
|
|
s->end--;
|
|
}
|
|
|
|
if (xrdp_iso_send(self->iso_layer, s) != 0)
|
|
{
|
|
DEBUG((" out xrdp_mcs_send error"));
|
|
return 1;
|
|
}
|
|
|
|
/* todo, do we need to call this for every mcs packet,
|
|
maybe every 5 or so */
|
|
if (chan == MCS_GLOBAL_CHANNEL)
|
|
{
|
|
xrdp_mcs_call_callback(self);
|
|
}
|
|
|
|
DEBUG((" out xrdp_mcs_send"));
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Internal help function to close the socket
|
|
* @param self
|
|
*/
|
|
void close_rdp_socket(struct xrdp_mcs *self)
|
|
{
|
|
if(self->iso_layer->tcp_layer)
|
|
{
|
|
if(self->iso_layer->tcp_layer->trans)
|
|
{
|
|
g_tcp_close(self->iso_layer->tcp_layer->trans->sck);
|
|
self->iso_layer->tcp_layer->trans->sck = 0 ;
|
|
g_writeln("xrdp_mcs_disconnect - socket closed");
|
|
return ;
|
|
}
|
|
}
|
|
g_writeln("Failed to close socket");
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
int APP_CC
|
|
xrdp_mcs_disconnect(struct xrdp_mcs *self)
|
|
{
|
|
struct stream *s;
|
|
|
|
DEBUG((" in xrdp_mcs_disconnect"));
|
|
make_stream(s);
|
|
init_stream(s, 8192);
|
|
|
|
if (xrdp_iso_init(self->iso_layer, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
close_rdp_socket(self);
|
|
DEBUG((" out xrdp_mcs_disconnect error - 1"));
|
|
return 1;
|
|
}
|
|
|
|
out_uint8(s, (MCS_DPUM << 2) | 1);
|
|
out_uint8(s, 0x80);
|
|
s_mark_end(s);
|
|
|
|
if (xrdp_iso_send(self->iso_layer, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
close_rdp_socket(self);
|
|
DEBUG((" out xrdp_mcs_disconnect error - 2"));
|
|
return 1;
|
|
}
|
|
|
|
free_stream(s);
|
|
close_rdp_socket(self);
|
|
DEBUG(("xrdp_mcs_disconnect - close sent"));
|
|
return 0;
|
|
}
|