433 lines
15 KiB
C
433 lines
15 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* FreeRDP Proxy Server
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*
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* Copyright 2019 Kobi Mizrachi <kmizrachi18@gmail.com>
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* Copyright 2019 Idan Freiberg <speidy@gmail.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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#include "pf_cliprdr.h"
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#include "pf_log.h"
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#define TAG PROXY_TAG("cliprdr")
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#define TEXT_FORMATS_COUNT 2
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/* used for createing a fake format list response, containing only text formats */
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static CLIPRDR_FORMAT g_text_formats[] = { { CF_TEXT, "\0" }, { CF_UNICODETEXT, "\0" } };
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BOOL pf_server_cliprdr_init(pServerContext* ps)
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{
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CliprdrServerContext* cliprdr;
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cliprdr = ps->cliprdr = cliprdr_server_context_new(ps->vcm);
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if (!cliprdr)
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{
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WLog_ERR(TAG, "cliprdr_server_context_new failed.");
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return FALSE;
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}
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cliprdr->rdpcontext = (rdpContext*)ps;
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/* enable all capabilities */
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cliprdr->useLongFormatNames = TRUE;
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cliprdr->streamFileClipEnabled = TRUE;
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cliprdr->fileClipNoFilePaths = TRUE;
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cliprdr->canLockClipData = TRUE;
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cliprdr->hasHugeFileSupport = TRUE;
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/* disable initialization sequence, for caps sync */
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cliprdr->autoInitializationSequence = FALSE;
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return TRUE;
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}
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static INLINE BOOL pf_cliprdr_is_text_format(UINT32 format)
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{
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switch (format)
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{
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case CF_TEXT:
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case CF_UNICODETEXT:
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return TRUE;
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}
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return FALSE;
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}
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static INLINE void pf_cliprdr_create_text_only_format_list(CLIPRDR_FORMAT_LIST* list)
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{
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list->msgFlags = CB_RESPONSE_OK;
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list->msgType = CB_FORMAT_LIST;
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list->dataLen = (4 + 1) * TEXT_FORMATS_COUNT;
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list->numFormats = TEXT_FORMATS_COUNT;
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list->formats = g_text_formats;
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}
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/* format data response PDU returns the copied text as a unicode buffer.
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* pf_cliprdr_is_copy_paste_valid returns TRUE if the length of the copied
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* text is valid according to the configuration value of `MaxTextLength`.
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*/
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static BOOL pf_cliprdr_is_copy_paste_valid(proxyConfig* config,
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const CLIPRDR_FORMAT_DATA_RESPONSE* pdu, UINT32 format)
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{
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size_t copy_len;
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if (config->MaxTextLength == 0)
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{
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/* no size limit */
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return TRUE;
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}
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if (pdu->dataLen == 0)
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{
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/* no data */
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return FALSE;
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}
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WLog_DBG(TAG, "pf_cliprdr_is_copy_paste_valid(): checking format %" PRIu32 "", format);
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switch (format)
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{
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case CF_UNICODETEXT:
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copy_len = (pdu->dataLen / 2) - 1;
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break;
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case CF_TEXT:
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copy_len = pdu->dataLen;
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break;
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default:
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WLog_WARN(TAG, "received unknown format: %" PRIu32 ", format");
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return FALSE;
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}
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if (copy_len > config->MaxTextLength)
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{
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WLog_WARN(TAG, "text size is too large: %" PRIu32 " (max %" PRIu32 ")", copy_len,
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config->MaxTextLength);
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return FALSE;
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}
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return TRUE;
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}
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/*
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* if the requested text size is too long, we need a way to return a message to the other side of
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* the connection, indicating that the copy/paste operation failed, instead of just not forwarding
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* the response (because that destroys the state of the RDPECLIP channel). This is done by sending a
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* `format_data_response` PDU with msgFlags = CB_RESPONSE_FAIL.
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*/
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static INLINE void pf_cliprdr_create_failed_format_data_response(CLIPRDR_FORMAT_DATA_RESPONSE* dst)
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{
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dst->requestedFormatData = NULL;
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dst->dataLen = 0;
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dst->msgType = CB_FORMAT_DATA_RESPONSE;
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dst->msgFlags = CB_RESPONSE_FAIL;
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}
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/* server callbacks */
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static UINT pf_cliprdr_ClientCapabilities(CliprdrServerContext* context,
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const CLIPRDR_CAPABILITIES* capabilities)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrClientContext* client = pdata->pc->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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return client->ClientCapabilities(client, capabilities);
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}
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static UINT pf_cliprdr_TempDirectory(CliprdrServerContext* context,
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const CLIPRDR_TEMP_DIRECTORY* tempDirectory)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrClientContext* client = pdata->pc->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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return client->TempDirectory(client, tempDirectory);
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}
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static UINT pf_cliprdr_ClientFormatList(CliprdrServerContext* context,
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const CLIPRDR_FORMAT_LIST* formatList)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrClientContext* client = pdata->pc->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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if (pdata->config->TextOnly)
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{
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CLIPRDR_FORMAT_LIST list;
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pf_cliprdr_create_text_only_format_list(&list);
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return client->ClientFormatList(client, &list);
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}
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/* send a format list that allows only text */
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return client->ClientFormatList(client, formatList);
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}
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static UINT
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pf_cliprdr_ClientFormatListResponse(CliprdrServerContext* context,
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const CLIPRDR_FORMAT_LIST_RESPONSE* formatListResponse)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrClientContext* client = pdata->pc->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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return client->ClientFormatListResponse(client, formatListResponse);
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}
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static UINT pf_cliprdr_ClientLockClipboardData(CliprdrServerContext* context,
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const CLIPRDR_LOCK_CLIPBOARD_DATA* lockClipboardData)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrClientContext* client = pdata->pc->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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return client->ClientLockClipboardData(client, lockClipboardData);
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}
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static UINT
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pf_cliprdr_ClientUnlockClipboardData(CliprdrServerContext* context,
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const CLIPRDR_UNLOCK_CLIPBOARD_DATA* unlockClipboardData)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrClientContext* client = pdata->pc->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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return client->ClientUnlockClipboardData(client, unlockClipboardData);
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}
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static UINT pf_cliprdr_ClientFormatDataRequest(CliprdrServerContext* context,
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const CLIPRDR_FORMAT_DATA_REQUEST* formatDataRequest)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrClientContext* client = pdata->pc->cliprdr;
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CliprdrServerContext* server = pdata->ps->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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if (pdata->config->TextOnly && !pf_cliprdr_is_text_format(formatDataRequest->requestedFormatId))
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{
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CLIPRDR_FORMAT_DATA_RESPONSE resp;
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pf_cliprdr_create_failed_format_data_response(&resp);
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return server->ServerFormatDataResponse(server, &resp);
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}
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return client->ClientFormatDataRequest(client, formatDataRequest);
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}
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static UINT
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pf_cliprdr_ClientFormatDataResponse(CliprdrServerContext* context,
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const CLIPRDR_FORMAT_DATA_RESPONSE* formatDataResponse)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrClientContext* client = pdata->pc->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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if (pf_cliprdr_is_text_format(client->lastRequestedFormatId))
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{
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if (!pf_cliprdr_is_copy_paste_valid(pdata->config, formatDataResponse,
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client->lastRequestedFormatId))
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{
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CLIPRDR_FORMAT_DATA_RESPONSE resp;
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pf_cliprdr_create_failed_format_data_response(&resp);
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return client->ClientFormatDataResponse(client, &resp);
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}
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}
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return client->ClientFormatDataResponse(client, formatDataResponse);
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}
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static UINT
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pf_cliprdr_ClientFileContentsRequest(CliprdrServerContext* context,
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const CLIPRDR_FILE_CONTENTS_REQUEST* fileContentsRequest)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrClientContext* client = pdata->pc->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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if (pdata->config->TextOnly)
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return CHANNEL_RC_OK;
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return client->ClientFileContentsRequest(client, fileContentsRequest);
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}
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static UINT
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pf_cliprdr_ClientFileContentsResponse(CliprdrServerContext* context,
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const CLIPRDR_FILE_CONTENTS_RESPONSE* fileContentsResponse)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrClientContext* client = pdata->pc->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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if (pdata->config->TextOnly)
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return CHANNEL_RC_OK;
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return client->ClientFileContentsResponse(client, fileContentsResponse);
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}
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/* client callbacks */
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static UINT pf_cliprdr_ServerCapabilities(CliprdrClientContext* context,
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const CLIPRDR_CAPABILITIES* capabilities)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrServerContext* server = pdata->ps->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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return server->ServerCapabilities(server, capabilities);
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}
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static UINT pf_cliprdr_MonitorReady(CliprdrClientContext* context,
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const CLIPRDR_MONITOR_READY* monitorReady)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrServerContext* server = pdata->ps->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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return server->MonitorReady(server, monitorReady);
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}
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static UINT pf_cliprdr_ServerFormatList(CliprdrClientContext* context,
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const CLIPRDR_FORMAT_LIST* formatList)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrServerContext* server = pdata->ps->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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if (pdata->config->TextOnly)
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{
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CLIPRDR_FORMAT_LIST list = { 0 };
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pf_cliprdr_create_text_only_format_list(&list);
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return server->ServerFormatList(server, &list);
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}
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return server->ServerFormatList(server, formatList);
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}
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static UINT
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pf_cliprdr_ServerFormatListResponse(CliprdrClientContext* context,
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const CLIPRDR_FORMAT_LIST_RESPONSE* formatListResponse)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrServerContext* server = pdata->ps->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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return server->ServerFormatListResponse(server, formatListResponse);
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}
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static UINT pf_cliprdr_ServerLockClipboardData(CliprdrClientContext* context,
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const CLIPRDR_LOCK_CLIPBOARD_DATA* lockClipboardData)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrServerContext* server = pdata->ps->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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return server->ServerLockClipboardData(server, lockClipboardData);
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}
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static UINT
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pf_cliprdr_ServerUnlockClipboardData(CliprdrClientContext* context,
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const CLIPRDR_UNLOCK_CLIPBOARD_DATA* unlockClipboardData)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrServerContext* server = pdata->ps->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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return server->ServerUnlockClipboardData(server, unlockClipboardData);
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}
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static UINT pf_cliprdr_ServerFormatDataRequest(CliprdrClientContext* context,
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const CLIPRDR_FORMAT_DATA_REQUEST* formatDataRequest)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrServerContext* server = pdata->ps->cliprdr;
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CliprdrClientContext* client = pdata->pc->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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if (pdata->config->TextOnly && !pf_cliprdr_is_text_format(formatDataRequest->requestedFormatId))
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{
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/* proxy's client needs to return a failed response directly to the client */
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CLIPRDR_FORMAT_DATA_RESPONSE resp;
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pf_cliprdr_create_failed_format_data_response(&resp);
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return client->ClientFormatDataResponse(client, &resp);
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}
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return server->ServerFormatDataRequest(server, formatDataRequest);
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}
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static UINT
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pf_cliprdr_ServerFormatDataResponse(CliprdrClientContext* context,
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const CLIPRDR_FORMAT_DATA_RESPONSE* formatDataResponse)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrServerContext* server = pdata->ps->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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if (pf_cliprdr_is_text_format(server->lastRequestedFormatId))
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{
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if (!pf_cliprdr_is_copy_paste_valid(pdata->config, formatDataResponse,
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server->lastRequestedFormatId))
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{
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CLIPRDR_FORMAT_DATA_RESPONSE resp;
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pf_cliprdr_create_failed_format_data_response(&resp);
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return server->ServerFormatDataResponse(server, &resp);
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}
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}
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return server->ServerFormatDataResponse(server, formatDataResponse);
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}
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static UINT
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pf_cliprdr_ServerFileContentsRequest(CliprdrClientContext* context,
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const CLIPRDR_FILE_CONTENTS_REQUEST* fileContentsRequest)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrServerContext* server = pdata->ps->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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if (pdata->config->TextOnly)
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return CHANNEL_RC_OK;
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return server->ServerFileContentsRequest(server, fileContentsRequest);
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}
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static UINT
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pf_cliprdr_ServerFileContentsResponse(CliprdrClientContext* context,
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const CLIPRDR_FILE_CONTENTS_RESPONSE* fileContentsResponse)
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{
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proxyData* pdata = (proxyData*)context->custom;
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CliprdrServerContext* server = pdata->ps->cliprdr;
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WLog_VRB(TAG, __FUNCTION__);
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if (pdata->config->TextOnly)
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return CHANNEL_RC_OK;
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return server->ServerFileContentsResponse(server, fileContentsResponse);
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}
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void pf_cliprdr_register_callbacks(CliprdrClientContext* cliprdr_client,
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CliprdrServerContext* cliprdr_server, proxyData* pdata)
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{
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/* Set server and client side references to proxy data */
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cliprdr_server->custom = (void*)pdata;
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cliprdr_client->custom = (void*)pdata;
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/* Set server callbacks */
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cliprdr_server->ClientCapabilities = pf_cliprdr_ClientCapabilities;
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cliprdr_server->TempDirectory = pf_cliprdr_TempDirectory;
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cliprdr_server->ClientFormatList = pf_cliprdr_ClientFormatList;
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cliprdr_server->ClientFormatListResponse = pf_cliprdr_ClientFormatListResponse;
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cliprdr_server->ClientLockClipboardData = pf_cliprdr_ClientLockClipboardData;
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cliprdr_server->ClientUnlockClipboardData = pf_cliprdr_ClientUnlockClipboardData;
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cliprdr_server->ClientFormatDataRequest = pf_cliprdr_ClientFormatDataRequest;
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cliprdr_server->ClientFormatDataResponse = pf_cliprdr_ClientFormatDataResponse;
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cliprdr_server->ClientFileContentsRequest = pf_cliprdr_ClientFileContentsRequest;
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cliprdr_server->ClientFileContentsResponse = pf_cliprdr_ClientFileContentsResponse;
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/* Set client callbacks */
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cliprdr_client->ServerCapabilities = pf_cliprdr_ServerCapabilities;
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cliprdr_client->MonitorReady = pf_cliprdr_MonitorReady;
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cliprdr_client->ServerFormatList = pf_cliprdr_ServerFormatList;
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cliprdr_client->ServerFormatListResponse = pf_cliprdr_ServerFormatListResponse;
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cliprdr_client->ServerLockClipboardData = pf_cliprdr_ServerLockClipboardData;
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cliprdr_client->ServerUnlockClipboardData = pf_cliprdr_ServerUnlockClipboardData;
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cliprdr_client->ServerFormatDataRequest = pf_cliprdr_ServerFormatDataRequest;
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cliprdr_client->ServerFormatDataResponse = pf_cliprdr_ServerFormatDataResponse;
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cliprdr_client->ServerFileContentsRequest = pf_cliprdr_ServerFileContentsRequest;
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cliprdr_client->ServerFileContentsResponse = pf_cliprdr_ServerFileContentsResponse;
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}
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