121 lines
4.7 KiB
C
121 lines
4.7 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* Smartcard Device Service Virtual Channel
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*
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* Copyright 2011 O.S. Systems Software Ltda.
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* Copyright 2011 Eduardo Fiss Beloni <beloni@ossystems.com.br>
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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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#ifndef FREERDP_CHANNEL_SMARTCARD_CLIENT_MAIN_H
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#define FREERDP_CHANNEL_SMARTCARD_CLIENT_MAIN_H
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#include <inttypes.h>
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#include <freerdp/utils/list.h>
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#include <freerdp/utils/debug.h>
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#include <freerdp/channels/rdpdr.h>
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#include <winpr/synch.h>
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/*
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* When using Windows Server 2008 R2 as the Terminal Services (TS)
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* server, and with a smart card reader connected to the TS client machine
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* and used to authenticate to an existing login session, the TS server
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* will initiate the protocol initialization of MS-RDPEFS, Section 1.3.1,
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* twice as it re-establishes a connection. The TS server starts both
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* initializations with a "Server Announce Request" message.
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* When the TS client receives this message, as per Section 3.2.5.1.2,
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*
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* The client SHOULD treat this packet as the beginning
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* of a new sequence. The client SHOULD also cancel all
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* outstanding requests and release previous references to
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* all devices.
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*
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* As of this writing, the code does not cancel all outstanding requests.
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* This leads to a problem where, after the first MS-RDPEFS initialization,
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* the TS server sends an SCARD_IOCTL_GETSTATUSCHANGEx control in a message
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* that uses an available "CompletionID". The
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* TS client doesn't respond immediately because it is blocking while
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* waiting for a change in the smart card's status in the reader.
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* Then the TS server initiates a second MS-RDPEFS initialization sequence.
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* As noted above, this should cancel the outstanding
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* SCARD_IOCTL_GETSTATUSCHANGEx request, but it does not.
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* At this point, the TS server is free to reuse the previously used
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* "CompletionID", and it does reuse it for other SCARD_IOCTLs.
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* Therefore, when the user removes (for example) the card from the reader,
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* the TS client sends an "IOCompetion" message in response to the
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* GETSTATUSCHANGEx using the original "CompletionID". The TS server does not
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* expect this "CompletionID" and so, as per Section 3.1.5.2 of MS-RDPEFS,
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* it treats that "IOCompletion" message as an error and terminates the
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* virtual channel.
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*
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* The following structure is part of a work-around for this missing
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* capability of canceling outstanding requests. This work-around
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* allows the TS client to send an "IOCompletion" back to the
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* TS server for the second (and subsequent) SCARD_IOCTLs that use
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* the same "CompletionID" as the still outstanding
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* SCARD_IOCTL_GETSTATUSCHANGEx. The work-around in the TS client
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* prevents the client from sending the "IOCompletion" back (when
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* the user removes the card) for the SCARD_IOCTL_GETSTATUSCHANGEx.
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*
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* This TS client expects the responses from the PCSC daemon for the second
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* and subsequent SCARD_IOCTLs that use the same "CompletionID"
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* to arrive at the TS client before the daemon's response to the
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* SCARD_IOCTL_GETSTATUSCHANGEx. This is a race condition.
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*
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* The "CompletionIDs" are a global pool of IDs across all "DeviceIDs".
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* However, this problem of duplicate "CompletionIDs" only affects smart cards.
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*
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* This structure tracks outstanding Terminal Services server "CompletionIDs"
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* used by the redirected smart card device.
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*/
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struct _COMPLETIONIDINFO
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{
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UINT32 ID; /* CompletionID */
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BOOL duplicate; /* Indicates whether or not this
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* CompletionID is a duplicate of an
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* earlier, outstanding, CompletionID.
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*/
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};
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typedef struct _COMPLETIONIDINFO COMPLETIONIDINFO;
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struct _SMARTCARD_DEVICE
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{
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DEVICE device;
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char* name;
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char* path;
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PSLIST_HEADER pIrpList;
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freerdp_thread* thread;
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LIST* CompletionIds;
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HANDLE CompletionIdsMutex;
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};
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typedef struct _SMARTCARD_DEVICE SMARTCARD_DEVICE;
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#ifdef WITH_DEBUG_SCARD
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#define DEBUG_SCARD(fmt, ...) DEBUG_CLASS(SCARD, fmt, ## __VA_ARGS__)
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#else
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#define DEBUG_SCARD(fmt, ...) DEBUG_NULL(fmt, ## __VA_ARGS__)
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#endif
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BOOL smartcard_async_op(IRP*);
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void smartcard_device_control(SMARTCARD_DEVICE*, IRP*);
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#endif /* FREERDP_CHANNEL_SMARTCARD_CLIENT_MAIN_H */
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