706 lines
16 KiB
C
706 lines
16 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* RDP Server Peer
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*
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* Copyright 2011 Vic Lee
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* Copyright 2014 DI (FH) Martin Haimberger <martin.haimberger@thincast.com>
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <winpr/crt.h>
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#include <winpr/winsock.h>
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#include "info.h"
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#include "certificate.h"
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#include <freerdp/log.h>
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#include "peer.h"
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#define TAG FREERDP_TAG("core.peer")
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#ifdef WITH_DEBUG_RDP
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extern const char* DATA_PDU_TYPE_STRINGS[80];
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#endif
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static HANDLE freerdp_peer_virtual_channel_open(freerdp_peer* client, const char* name, UINT32 flags)
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{
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int length;
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UINT32 index;
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BOOL joined = FALSE;
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rdpMcsChannel* mcsChannel = NULL;
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rdpPeerChannel* peerChannel = NULL;
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rdpMcs* mcs = client->context->rdp->mcs;
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if (flags & WTS_CHANNEL_OPTION_DYNAMIC)
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return NULL; /* not yet supported */
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length = strlen(name);
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if (length > 8)
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return NULL; /* SVC maximum name length is 8 */
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for (index = 0; index < mcs->channelCount; index++)
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{
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mcsChannel = &(mcs->channels[index]);
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if (!mcsChannel->joined)
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continue;
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if (_strnicmp(name, mcsChannel->Name, length) == 0)
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{
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joined = TRUE;
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break;
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}
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}
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if (!joined)
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return NULL; /* channel is not joined */
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peerChannel = (rdpPeerChannel*) mcsChannel->handle;
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if (peerChannel)
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{
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/* channel is already open */
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return (HANDLE) peerChannel;
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}
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peerChannel = (rdpPeerChannel*) calloc(1, sizeof(rdpPeerChannel));
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if (peerChannel)
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{
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peerChannel->index = index;
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peerChannel->client = client;
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peerChannel->channelFlags = flags;
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peerChannel->channelId = mcsChannel->ChannelId;
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peerChannel->mcsChannel = mcsChannel;
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mcsChannel->handle = (void*) peerChannel;
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}
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return (HANDLE) peerChannel;
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}
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static BOOL freerdp_peer_virtual_channel_close(freerdp_peer* client, HANDLE hChannel)
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{
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rdpMcsChannel* mcsChannel = NULL;
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rdpPeerChannel* peerChannel = NULL;
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if (!hChannel)
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return FALSE;
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peerChannel = (rdpPeerChannel*) hChannel;
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mcsChannel = peerChannel->mcsChannel;
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mcsChannel->handle = NULL;
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free(peerChannel);
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return TRUE;
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}
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int freerdp_peer_virtual_channel_read(freerdp_peer* client, HANDLE hChannel, BYTE* buffer, UINT32 length)
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{
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return 0; /* this needs to be implemented by the server application */
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}
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static int freerdp_peer_virtual_channel_write(freerdp_peer* client, HANDLE hChannel, BYTE* buffer, UINT32 length)
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{
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wStream* s;
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UINT32 flags;
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UINT32 chunkSize;
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UINT32 maxChunkSize;
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UINT32 totalLength;
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rdpPeerChannel* peerChannel;
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rdpMcsChannel* mcsChannel;
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rdpRdp* rdp = client->context->rdp;
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if (!hChannel)
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return -1;
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peerChannel = (rdpPeerChannel*) hChannel;
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mcsChannel = peerChannel->mcsChannel;
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if (peerChannel->channelFlags & WTS_CHANNEL_OPTION_DYNAMIC)
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return -1; /* not yet supported */
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maxChunkSize = rdp->settings->VirtualChannelChunkSize;
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totalLength = length;
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flags = CHANNEL_FLAG_FIRST;
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while (length > 0)
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{
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s = rdp_send_stream_init(rdp);
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if (length > maxChunkSize)
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{
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chunkSize = rdp->settings->VirtualChannelChunkSize;
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}
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else
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{
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chunkSize = length;
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flags |= CHANNEL_FLAG_LAST;
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}
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if (mcsChannel->options & CHANNEL_OPTION_SHOW_PROTOCOL)
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flags |= CHANNEL_FLAG_SHOW_PROTOCOL;
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Stream_Write_UINT32(s, totalLength);
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Stream_Write_UINT32(s, flags);
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Stream_EnsureRemainingCapacity(s, chunkSize);
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Stream_Write(s, buffer, chunkSize);
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rdp_send(rdp, s, peerChannel->channelId);
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buffer += chunkSize;
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length -= chunkSize;
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flags = 0;
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}
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return 1;
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}
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void* freerdp_peer_virtual_channel_get_data(freerdp_peer* client, HANDLE hChannel)
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{
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rdpPeerChannel* peerChannel = (rdpPeerChannel*) hChannel;
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if (!hChannel)
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return NULL;
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return peerChannel->extra;
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}
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int freerdp_peer_virtual_channel_set_data(freerdp_peer* client, HANDLE hChannel, void* data)
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{
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rdpPeerChannel* peerChannel = (rdpPeerChannel*) hChannel;
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if (!hChannel)
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return -1;
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peerChannel->extra = data;
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return 1;
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}
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static BOOL freerdp_peer_initialize(freerdp_peer* client)
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{
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rdpRdp* rdp = client->context->rdp;
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rdpSettings* settings = rdp->settings;
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settings->ServerMode = TRUE;
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settings->FrameAcknowledge = 0;
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settings->LocalConnection = client->local;
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rdp->state = CONNECTION_STATE_INITIAL;
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if (settings->RdpKeyFile)
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{
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settings->RdpServerRsaKey = key_new(settings->RdpKeyFile);
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if (!settings->RdpServerRsaKey)
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{
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WLog_ERR(TAG, "inavlid RDP key file %s", settings->RdpKeyFile);
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return FALSE;
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}
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if (settings->RdpServerRsaKey->ModulusLength > 256)
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{
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WLog_ERR(TAG, "Key sizes > 2048 are currently not supported for RDP security.");
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WLog_ERR(TAG, "Set a different key file than %s", settings->RdpKeyFile);
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exit(1);
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}
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}
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return TRUE;
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}
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static BOOL freerdp_peer_get_fds(freerdp_peer* client, void** rfds, int* rcount)
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{
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rfds[*rcount] = (void*)(long)(client->context->rdp->transport->TcpIn->sockfd);
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(*rcount)++;
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return TRUE;
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}
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static HANDLE freerdp_peer_get_event_handle(freerdp_peer* client)
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{
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return client->context->rdp->transport->TcpIn->event;
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}
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static BOOL freerdp_peer_check_fds(freerdp_peer* peer)
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{
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int status;
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rdpRdp* rdp;
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rdp = peer->context->rdp;
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status = rdp_check_fds(rdp);
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if (status < 0)
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return FALSE;
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return TRUE;
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}
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static BOOL peer_recv_data_pdu(freerdp_peer* client, wStream* s)
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{
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BYTE type;
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UINT16 length;
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UINT32 share_id;
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BYTE compressed_type;
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UINT16 compressed_len;
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if (!rdp_read_share_data_header(s, &length, &type, &share_id, &compressed_type, &compressed_len))
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return FALSE;
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#ifdef WITH_DEBUG_RDP
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WLog_DBG(TAG, "recv %s Data PDU (0x%02X), length: %d",
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type < ARRAYSIZE(DATA_PDU_TYPE_STRINGS) ? DATA_PDU_TYPE_STRINGS[type] : "???", type, length);
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#endif
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switch (type)
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{
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case DATA_PDU_TYPE_SYNCHRONIZE:
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if (!rdp_recv_client_synchronize_pdu(client->context->rdp, s))
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return FALSE;
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break;
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case DATA_PDU_TYPE_CONTROL:
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if (!rdp_server_accept_client_control_pdu(client->context->rdp, s))
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return FALSE;
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break;
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case DATA_PDU_TYPE_INPUT:
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if (!input_recv(client->context->rdp->input, s))
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return FALSE;
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break;
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case DATA_PDU_TYPE_BITMAP_CACHE_PERSISTENT_LIST:
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/* TODO: notify server bitmap cache data */
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break;
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case DATA_PDU_TYPE_FONT_LIST:
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if (!rdp_server_accept_client_font_list_pdu(client->context->rdp, s))
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return FALSE;
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break;
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case DATA_PDU_TYPE_SHUTDOWN_REQUEST:
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mcs_send_disconnect_provider_ultimatum(client->context->rdp->mcs);
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return FALSE;
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case DATA_PDU_TYPE_FRAME_ACKNOWLEDGE:
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if (Stream_GetRemainingLength(s) < 4)
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return FALSE;
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Stream_Read_UINT32(s, client->ack_frame_id);
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IFCALL(client->update->SurfaceFrameAcknowledge, client->update->context, client->ack_frame_id);
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break;
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case DATA_PDU_TYPE_REFRESH_RECT:
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if (!update_read_refresh_rect(client->update, s))
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return FALSE;
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break;
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case DATA_PDU_TYPE_SUPPRESS_OUTPUT:
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if (!update_read_suppress_output(client->update, s))
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return FALSE;
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break;
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default:
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WLog_ERR(TAG, "Data PDU type %d", type);
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break;
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}
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return TRUE;
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}
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static int peer_recv_tpkt_pdu(freerdp_peer* client, wStream* s)
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{
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rdpRdp* rdp;
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UINT16 length;
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UINT16 pduType;
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UINT16 pduLength;
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UINT16 pduSource;
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UINT16 channelId;
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UINT16 securityFlags;
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rdp = client->context->rdp;
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if (!rdp_read_header(rdp, s, &length, &channelId))
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{
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WLog_ERR(TAG, "Incorrect RDP header.");
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return -1;
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}
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if (rdp->disconnect)
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return 0;
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if (rdp->settings->UseRdpSecurityLayer)
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{
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if (!rdp_read_security_header(s, &securityFlags))
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return -1;
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if (securityFlags & SEC_ENCRYPT)
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{
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if (!rdp_decrypt(rdp, s, length - 4, securityFlags))
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{
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WLog_ERR(TAG, "rdp_decrypt failed");
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return -1;
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}
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}
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}
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if (channelId == MCS_GLOBAL_CHANNEL_ID)
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{
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if (!rdp_read_share_control_header(s, &pduLength, &pduType, &pduSource))
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return -1;
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client->settings->PduSource = pduSource;
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switch (pduType)
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{
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case PDU_TYPE_DATA:
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if (!peer_recv_data_pdu(client, s))
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return -1;
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break;
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case PDU_TYPE_CONFIRM_ACTIVE:
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if (!rdp_server_accept_confirm_active(rdp, s))
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return -1;
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break;
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case PDU_TYPE_FLOW_RESPONSE:
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case PDU_TYPE_FLOW_STOP:
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case PDU_TYPE_FLOW_TEST:
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break;
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default:
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WLog_ERR(TAG, "Client sent pduType %d", pduType);
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return -1;
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}
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}
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else if (rdp->mcs->messageChannelId && channelId == rdp->mcs->messageChannelId)
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{
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return rdp_recv_message_channel_pdu(rdp, s);
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}
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else
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{
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if (!freerdp_channel_peer_process(client, s, channelId))
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return -1;
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}
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return 0;
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}
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static int peer_recv_fastpath_pdu(freerdp_peer* client, wStream* s)
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{
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rdpRdp* rdp;
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UINT16 length;
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rdpFastPath* fastpath;
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rdp = client->context->rdp;
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fastpath = rdp->fastpath;
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fastpath_read_header_rdp(fastpath, s, &length);
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if ((length == 0) || (length > Stream_GetRemainingLength(s)))
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{
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WLog_ERR(TAG, "incorrect FastPath PDU header length %d", length);
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return -1;
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}
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if (fastpath->encryptionFlags & FASTPATH_OUTPUT_ENCRYPTED)
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{
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if (!rdp_decrypt(rdp, s, length, (fastpath->encryptionFlags & FASTPATH_OUTPUT_SECURE_CHECKSUM) ? SEC_SECURE_CHECKSUM : 0))
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return -1;
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}
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return fastpath_recv_inputs(fastpath, s);
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}
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static int peer_recv_pdu(freerdp_peer* client, wStream* s)
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{
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if (tpkt_verify_header(s))
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return peer_recv_tpkt_pdu(client, s);
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else
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return peer_recv_fastpath_pdu(client, s);
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}
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static int peer_recv_callback(rdpTransport* transport, wStream* s, void* extra)
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{
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freerdp_peer* client = (freerdp_peer*) extra;
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rdpRdp* rdp = client->context->rdp;
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switch (rdp->state)
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{
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case CONNECTION_STATE_INITIAL:
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if (!rdp_server_accept_nego(rdp, s))
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return -1;
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if (rdp->nego->SelectedProtocol & PROTOCOL_NLA)
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{
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sspi_CopyAuthIdentity(&client->identity, &(rdp->nego->transport->credssp->identity));
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IFCALLRET(client->Logon, client->authenticated, client, &client->identity, TRUE);
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credssp_free(rdp->nego->transport->credssp);
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rdp->nego->transport->credssp = NULL;
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}
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else
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{
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IFCALLRET(client->Logon, client->authenticated, client, &client->identity, FALSE);
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}
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break;
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case CONNECTION_STATE_NEGO:
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if (!rdp_server_accept_mcs_connect_initial(rdp, s))
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return -1;
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break;
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case CONNECTION_STATE_MCS_CONNECT:
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if (!rdp_server_accept_mcs_erect_domain_request(rdp, s))
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return -1;
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break;
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case CONNECTION_STATE_MCS_ERECT_DOMAIN:
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if (!rdp_server_accept_mcs_attach_user_request(rdp, s))
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return -1;
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break;
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case CONNECTION_STATE_MCS_ATTACH_USER:
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if (!rdp_server_accept_mcs_channel_join_request(rdp, s))
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return -1;
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break;
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case CONNECTION_STATE_RDP_SECURITY_COMMENCEMENT:
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if (rdp->settings->UseRdpSecurityLayer)
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{
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if (!rdp_server_establish_keys(rdp, s))
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return -1;
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}
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rdp_server_transition_to_state(rdp, CONNECTION_STATE_SECURE_SETTINGS_EXCHANGE);
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if (Stream_GetRemainingLength(s) > 0)
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return peer_recv_callback(transport, s, extra);
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break;
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case CONNECTION_STATE_SECURE_SETTINGS_EXCHANGE:
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if (!rdp_recv_client_info(rdp, s))
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return -1;
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rdp_server_transition_to_state(rdp, CONNECTION_STATE_LICENSING);
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return peer_recv_callback(transport, NULL, extra);
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break;
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case CONNECTION_STATE_LICENSING:
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if (!license_send_valid_client_error_packet(rdp->license))
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return FALSE;
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rdp_server_transition_to_state(rdp, CONNECTION_STATE_CAPABILITIES_EXCHANGE);
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return peer_recv_callback(transport, NULL, extra);
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break;
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case CONNECTION_STATE_CAPABILITIES_EXCHANGE:
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if (!rdp->AwaitCapabilities)
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{
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IFCALL(client->Capabilities, client);
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if (!rdp_send_demand_active(rdp))
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return -1;
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rdp->AwaitCapabilities = TRUE;
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if (s)
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{
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if (peer_recv_pdu(client, s) < 0)
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return -1;
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}
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}
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else
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{
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/**
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* During reactivation sequence the client might sent some input or channel data
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* before receiving the Deactivate All PDU. We need to process them as usual.
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*/
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if (peer_recv_pdu(client, s) < 0)
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return -1;
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}
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break;
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case CONNECTION_STATE_FINALIZATION:
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if (peer_recv_pdu(client, s) < 0)
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return -1;
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break;
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case CONNECTION_STATE_ACTIVE:
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if (peer_recv_pdu(client, s) < 0)
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return -1;
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break;
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default:
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WLog_ERR(TAG, "Invalid state %d", rdp->state);
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return -1;
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}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static BOOL freerdp_peer_close(freerdp_peer* client)
|
|
{
|
|
/**
|
|
* [MS-RDPBCGR] 1.3.1.4.2 User-Initiated Disconnection Sequence on Server
|
|
* The server first sends the client a Deactivate All PDU followed by an
|
|
* optional MCS Disconnect Provider Ultimatum PDU.
|
|
*/
|
|
if (!rdp_send_deactivate_all(client->context->rdp))
|
|
return FALSE;
|
|
|
|
if (freerdp_get_param_bool(client->settings, FreeRDP_SupportErrorInfoPdu) ) {
|
|
rdp_send_error_info(client->context->rdp);
|
|
}
|
|
|
|
return mcs_send_disconnect_provider_ultimatum(client->context->rdp->mcs);
|
|
}
|
|
|
|
static void freerdp_peer_disconnect(freerdp_peer* client)
|
|
{
|
|
transport_disconnect(client->context->rdp->transport);
|
|
}
|
|
|
|
static int freerdp_peer_send_channel_data(freerdp_peer* client, UINT16 channelId, BYTE* data, int size)
|
|
{
|
|
return rdp_send_channel_data(client->context->rdp, channelId, data, size);
|
|
}
|
|
|
|
static BOOL freerdp_peer_is_write_blocked(freerdp_peer* peer)
|
|
{
|
|
return tranport_is_write_blocked(peer->context->rdp->transport);
|
|
}
|
|
|
|
static int freerdp_peer_drain_output_buffer(freerdp_peer* peer)
|
|
{
|
|
rdpTransport* transport = peer->context->rdp->transport;
|
|
|
|
return tranport_drain_output_buffer(transport);
|
|
}
|
|
|
|
void freerdp_peer_context_new(freerdp_peer* client)
|
|
{
|
|
rdpRdp* rdp;
|
|
|
|
client->context = (rdpContext*) calloc(1, client->ContextSize);
|
|
|
|
client->context->ServerMode = TRUE;
|
|
|
|
client->context->metrics = metrics_new(client->context);
|
|
|
|
rdp = rdp_new(client->context);
|
|
|
|
client->input = rdp->input;
|
|
client->update = rdp->update;
|
|
client->settings = rdp->settings;
|
|
client->autodetect = rdp->autodetect;
|
|
|
|
client->context->rdp = rdp;
|
|
client->context->peer = client;
|
|
client->context->input = client->input;
|
|
client->context->update = client->update;
|
|
client->context->settings = client->settings;
|
|
client->context->autodetect = client->autodetect;
|
|
|
|
client->update->context = client->context;
|
|
client->input->context = client->context;
|
|
client->autodetect->context = client->context;
|
|
|
|
update_register_server_callbacks(client->update);
|
|
autodetect_register_server_callbacks(client->autodetect);
|
|
|
|
transport_attach(rdp->transport, client->sockfd);
|
|
|
|
rdp->transport->ReceiveCallback = peer_recv_callback;
|
|
rdp->transport->ReceiveExtra = client;
|
|
transport_set_blocking_mode(rdp->transport, FALSE);
|
|
|
|
client->IsWriteBlocked = freerdp_peer_is_write_blocked;
|
|
client->DrainOutputBuffer = freerdp_peer_drain_output_buffer;
|
|
|
|
IFCALL(client->ContextNew, client, client->context);
|
|
}
|
|
|
|
void freerdp_peer_context_free(freerdp_peer* client)
|
|
{
|
|
IFCALL(client->ContextFree, client, client->context);
|
|
|
|
metrics_free(client->context->metrics);
|
|
}
|
|
|
|
freerdp_peer* freerdp_peer_new(int sockfd)
|
|
{
|
|
UINT32 option_value;
|
|
socklen_t option_len;
|
|
freerdp_peer* client;
|
|
|
|
client = (freerdp_peer*) calloc(1, sizeof(freerdp_peer));
|
|
|
|
if (!client)
|
|
return NULL;
|
|
|
|
option_value = TRUE;
|
|
option_len = sizeof(option_value);
|
|
|
|
setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, (void*) &option_value, option_len);
|
|
|
|
if (client)
|
|
{
|
|
client->sockfd = sockfd;
|
|
client->ContextSize = sizeof(rdpContext);
|
|
client->Initialize = freerdp_peer_initialize;
|
|
client->GetFileDescriptor = freerdp_peer_get_fds;
|
|
client->GetEventHandle = freerdp_peer_get_event_handle;
|
|
client->CheckFileDescriptor = freerdp_peer_check_fds;
|
|
client->Close = freerdp_peer_close;
|
|
client->Disconnect = freerdp_peer_disconnect;
|
|
client->SendChannelData = freerdp_peer_send_channel_data;
|
|
client->IsWriteBlocked = freerdp_peer_is_write_blocked;
|
|
client->DrainOutputBuffer = freerdp_peer_drain_output_buffer;
|
|
client->VirtualChannelOpen = freerdp_peer_virtual_channel_open;
|
|
client->VirtualChannelClose = freerdp_peer_virtual_channel_close;
|
|
client->VirtualChannelWrite = freerdp_peer_virtual_channel_write;
|
|
client->VirtualChannelRead = NULL; /* must be defined by server application */
|
|
client->VirtualChannelGetData = freerdp_peer_virtual_channel_get_data;
|
|
client->VirtualChannelSetData = freerdp_peer_virtual_channel_set_data;
|
|
}
|
|
|
|
return client;
|
|
}
|
|
|
|
void freerdp_peer_free(freerdp_peer* client)
|
|
{
|
|
if (!client)
|
|
return;
|
|
|
|
rdp_free(client->context->rdp);
|
|
free(client->context);
|
|
free(client);
|
|
}
|