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4a72dafa19
This worker function is needed to send SMB2 fsctl (and ioctl) requests including: validating negotiation info (secure negotiate) querying the servers network interfaces copy offload (refcopy) Followon patches for the above three will use this. This patch also does general validation of the response. In the future, as David Disseldorp notes, for the copychunk ioctl case, we will want to enhance the response processing to allow returning the chunk request limits to the caller (even though the server returns an error, in that case we would return data that the caller could use - see 2.2.32.1). See MS-SMB2 Section 2.2.31 for more details on format of fsctl. Acked-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
588 lines
17 KiB
C
588 lines
17 KiB
C
/*
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* fs/cifs/smb2misc.c
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*
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* Copyright (C) International Business Machines Corp., 2002,2011
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* Etersoft, 2012
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* Author(s): Steve French (sfrench@us.ibm.com)
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* Pavel Shilovsky (pshilovsky@samba.org) 2012
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/ctype.h>
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#include "smb2pdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "smb2proto.h"
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#include "cifs_debug.h"
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#include "cifs_unicode.h"
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#include "smb2status.h"
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static int
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check_smb2_hdr(struct smb2_hdr *hdr, __u64 mid)
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{
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/*
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* Make sure that this really is an SMB, that it is a response,
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* and that the message ids match.
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*/
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if ((*(__le32 *)hdr->ProtocolId == SMB2_PROTO_NUMBER) &&
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(mid == hdr->MessageId)) {
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if (hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
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return 0;
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else {
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/* only one valid case where server sends us request */
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if (hdr->Command == SMB2_OPLOCK_BREAK)
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return 0;
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else
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cifs_dbg(VFS, "Received Request not response\n");
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}
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} else { /* bad signature or mid */
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if (*(__le32 *)hdr->ProtocolId != SMB2_PROTO_NUMBER)
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cifs_dbg(VFS, "Bad protocol string signature header %x\n",
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*(unsigned int *) hdr->ProtocolId);
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if (mid != hdr->MessageId)
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cifs_dbg(VFS, "Mids do not match: %llu and %llu\n",
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mid, hdr->MessageId);
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}
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cifs_dbg(VFS, "Bad SMB detected. The Mid=%llu\n", hdr->MessageId);
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return 1;
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}
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/*
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* The following table defines the expected "StructureSize" of SMB2 responses
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* in order by SMB2 command. This is similar to "wct" in SMB/CIFS responses.
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*
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* Note that commands are defined in smb2pdu.h in le16 but the array below is
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* indexed by command in host byte order
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*/
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static const __le16 smb2_rsp_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
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/* SMB2_NEGOTIATE */ __constant_cpu_to_le16(65),
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/* SMB2_SESSION_SETUP */ __constant_cpu_to_le16(9),
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/* SMB2_LOGOFF */ __constant_cpu_to_le16(4),
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/* SMB2_TREE_CONNECT */ __constant_cpu_to_le16(16),
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/* SMB2_TREE_DISCONNECT */ __constant_cpu_to_le16(4),
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/* SMB2_CREATE */ __constant_cpu_to_le16(89),
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/* SMB2_CLOSE */ __constant_cpu_to_le16(60),
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/* SMB2_FLUSH */ __constant_cpu_to_le16(4),
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/* SMB2_READ */ __constant_cpu_to_le16(17),
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/* SMB2_WRITE */ __constant_cpu_to_le16(17),
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/* SMB2_LOCK */ __constant_cpu_to_le16(4),
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/* SMB2_IOCTL */ __constant_cpu_to_le16(49),
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/* BB CHECK this ... not listed in documentation */
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/* SMB2_CANCEL */ __constant_cpu_to_le16(0),
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/* SMB2_ECHO */ __constant_cpu_to_le16(4),
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/* SMB2_QUERY_DIRECTORY */ __constant_cpu_to_le16(9),
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/* SMB2_CHANGE_NOTIFY */ __constant_cpu_to_le16(9),
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/* SMB2_QUERY_INFO */ __constant_cpu_to_le16(9),
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/* SMB2_SET_INFO */ __constant_cpu_to_le16(2),
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/* BB FIXME can also be 44 for lease break */
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/* SMB2_OPLOCK_BREAK */ __constant_cpu_to_le16(24)
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};
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int
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smb2_check_message(char *buf, unsigned int length)
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{
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struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
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struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
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__u64 mid = hdr->MessageId;
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__u32 len = get_rfc1002_length(buf);
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__u32 clc_len; /* calculated length */
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int command;
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/* BB disable following printk later */
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cifs_dbg(FYI, "%s length: 0x%x, smb_buf_length: 0x%x\n",
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__func__, length, len);
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/*
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* Add function to do table lookup of StructureSize by command
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* ie Validate the wct via smb2_struct_sizes table above
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*/
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if (length < sizeof(struct smb2_pdu)) {
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if ((length >= sizeof(struct smb2_hdr)) && (hdr->Status != 0)) {
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pdu->StructureSize2 = 0;
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/*
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* As with SMB/CIFS, on some error cases servers may
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* not return wct properly
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*/
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return 0;
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} else {
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cifs_dbg(VFS, "Length less than SMB header size\n");
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}
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return 1;
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}
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if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE - 4) {
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cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n",
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mid);
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return 1;
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}
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if (check_smb2_hdr(hdr, mid))
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return 1;
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if (hdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
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cifs_dbg(VFS, "Illegal structure size %u\n",
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le16_to_cpu(hdr->StructureSize));
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return 1;
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}
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command = le16_to_cpu(hdr->Command);
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if (command >= NUMBER_OF_SMB2_COMMANDS) {
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cifs_dbg(VFS, "Illegal SMB2 command %d\n", command);
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return 1;
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}
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if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
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if (command != SMB2_OPLOCK_BREAK_HE && (hdr->Status == 0 ||
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pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) {
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/* error packets have 9 byte structure size */
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cifs_dbg(VFS, "Illegal response size %u for command %d\n",
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le16_to_cpu(pdu->StructureSize2), command);
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return 1;
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} else if (command == SMB2_OPLOCK_BREAK_HE && (hdr->Status == 0)
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&& (le16_to_cpu(pdu->StructureSize2) != 44)
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&& (le16_to_cpu(pdu->StructureSize2) != 36)) {
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/* special case for SMB2.1 lease break message */
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cifs_dbg(VFS, "Illegal response size %d for oplock break\n",
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le16_to_cpu(pdu->StructureSize2));
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return 1;
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}
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}
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if (4 + len != length) {
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cifs_dbg(VFS, "Total length %u RFC1002 length %u mismatch mid %llu\n",
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length, 4 + len, mid);
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return 1;
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}
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clc_len = smb2_calc_size(hdr);
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if (4 + len != clc_len) {
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cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n",
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clc_len, 4 + len, mid);
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/* Windows 7 server returns 24 bytes more */
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if (clc_len + 20 == len && command == SMB2_OPLOCK_BREAK_HE)
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return 0;
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/* server can return one byte more */
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if (clc_len == 4 + len + 1)
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return 0;
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return 1;
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}
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return 0;
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}
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/*
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* The size of the variable area depends on the offset and length fields
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* located in different fields for various SMB2 responses. SMB2 responses
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* with no variable length info, show an offset of zero for the offset field.
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*/
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static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
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/* SMB2_NEGOTIATE */ true,
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/* SMB2_SESSION_SETUP */ true,
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/* SMB2_LOGOFF */ false,
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/* SMB2_TREE_CONNECT */ false,
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/* SMB2_TREE_DISCONNECT */ false,
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/* SMB2_CREATE */ true,
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/* SMB2_CLOSE */ false,
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/* SMB2_FLUSH */ false,
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/* SMB2_READ */ true,
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/* SMB2_WRITE */ false,
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/* SMB2_LOCK */ false,
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/* SMB2_IOCTL */ true,
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/* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
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/* SMB2_ECHO */ false,
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/* SMB2_QUERY_DIRECTORY */ true,
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/* SMB2_CHANGE_NOTIFY */ true,
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/* SMB2_QUERY_INFO */ true,
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/* SMB2_SET_INFO */ false,
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/* SMB2_OPLOCK_BREAK */ false
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};
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/*
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* Returns the pointer to the beginning of the data area. Length of the data
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* area and the offset to it (from the beginning of the smb are also returned.
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*/
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char *
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smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
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{
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*off = 0;
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*len = 0;
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/* error responses do not have data area */
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if (hdr->Status && hdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
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(((struct smb2_err_rsp *)hdr)->StructureSize) ==
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SMB2_ERROR_STRUCTURE_SIZE2)
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return NULL;
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/*
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* Following commands have data areas so we have to get the location
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* of the data buffer offset and data buffer length for the particular
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* command.
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*/
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switch (hdr->Command) {
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case SMB2_NEGOTIATE:
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*off = le16_to_cpu(
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((struct smb2_negotiate_rsp *)hdr)->SecurityBufferOffset);
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*len = le16_to_cpu(
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((struct smb2_negotiate_rsp *)hdr)->SecurityBufferLength);
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break;
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case SMB2_SESSION_SETUP:
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*off = le16_to_cpu(
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((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferOffset);
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*len = le16_to_cpu(
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((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferLength);
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break;
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case SMB2_CREATE:
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*off = le32_to_cpu(
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((struct smb2_create_rsp *)hdr)->CreateContextsOffset);
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*len = le32_to_cpu(
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((struct smb2_create_rsp *)hdr)->CreateContextsLength);
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break;
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case SMB2_QUERY_INFO:
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*off = le16_to_cpu(
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((struct smb2_query_info_rsp *)hdr)->OutputBufferOffset);
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*len = le32_to_cpu(
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((struct smb2_query_info_rsp *)hdr)->OutputBufferLength);
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break;
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case SMB2_READ:
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*off = ((struct smb2_read_rsp *)hdr)->DataOffset;
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*len = le32_to_cpu(((struct smb2_read_rsp *)hdr)->DataLength);
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break;
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case SMB2_QUERY_DIRECTORY:
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*off = le16_to_cpu(
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((struct smb2_query_directory_rsp *)hdr)->OutputBufferOffset);
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*len = le32_to_cpu(
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((struct smb2_query_directory_rsp *)hdr)->OutputBufferLength);
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break;
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case SMB2_IOCTL:
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*off = le32_to_cpu(
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((struct smb2_ioctl_rsp *)hdr)->OutputOffset);
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*len = le32_to_cpu(((struct smb2_ioctl_rsp *)hdr)->OutputCount);
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break;
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case SMB2_CHANGE_NOTIFY:
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default:
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/* BB FIXME for unimplemented cases above */
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cifs_dbg(VFS, "no length check for command\n");
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break;
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}
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/*
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* Invalid length or offset probably means data area is invalid, but
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* we have little choice but to ignore the data area in this case.
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*/
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if (*off > 4096) {
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cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off);
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*len = 0;
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*off = 0;
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} else if (*off < 0) {
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cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n",
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*off);
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*off = 0;
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*len = 0;
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} else if (*len < 0) {
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cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n",
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*len);
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*len = 0;
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} else if (*len > 128 * 1024) {
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cifs_dbg(VFS, "data area larger than 128K: %d\n", *len);
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*len = 0;
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}
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/* return pointer to beginning of data area, ie offset from SMB start */
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if ((*off != 0) && (*len != 0))
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return hdr->ProtocolId + *off;
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else
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return NULL;
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}
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/*
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* Calculate the size of the SMB message based on the fixed header
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* portion, the number of word parameters and the data portion of the message.
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*/
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unsigned int
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smb2_calc_size(void *buf)
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{
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struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
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struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
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int offset; /* the offset from the beginning of SMB to data area */
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int data_length; /* the length of the variable length data area */
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/* Structure Size has already been checked to make sure it is 64 */
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int len = 4 + le16_to_cpu(pdu->hdr.StructureSize);
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/*
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* StructureSize2, ie length of fixed parameter area has already
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* been checked to make sure it is the correct length.
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*/
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len += le16_to_cpu(pdu->StructureSize2);
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if (has_smb2_data_area[le16_to_cpu(hdr->Command)] == false)
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goto calc_size_exit;
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smb2_get_data_area_len(&offset, &data_length, hdr);
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cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset);
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if (data_length > 0) {
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/*
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* Check to make sure that data area begins after fixed area,
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* Note that last byte of the fixed area is part of data area
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* for some commands, typically those with odd StructureSize,
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* so we must add one to the calculation (and 4 to account for
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* the size of the RFC1001 hdr.
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*/
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if (offset + 4 + 1 < len) {
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cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n",
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offset + 4 + 1, len);
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data_length = 0;
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} else {
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len = 4 + offset + data_length;
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}
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}
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calc_size_exit:
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cifs_dbg(FYI, "SMB2 len %d\n", len);
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return len;
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}
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/* Note: caller must free return buffer */
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__le16 *
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cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
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{
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int len;
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const char *start_of_path;
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__le16 *to;
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/* Windows doesn't allow paths beginning with \ */
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if (from[0] == '\\')
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start_of_path = from + 1;
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else
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start_of_path = from;
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to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
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cifs_sb->local_nls,
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cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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return to;
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}
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__le32
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smb2_get_lease_state(struct cifsInodeInfo *cinode)
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{
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if (cinode->clientCanCacheAll)
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return SMB2_LEASE_WRITE_CACHING | SMB2_LEASE_READ_CACHING;
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else if (cinode->clientCanCacheRead)
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return SMB2_LEASE_READ_CACHING;
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return 0;
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}
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__u8 smb2_map_lease_to_oplock(__le32 lease_state)
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{
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if (lease_state & SMB2_LEASE_WRITE_CACHING) {
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if (lease_state & SMB2_LEASE_HANDLE_CACHING)
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return SMB2_OPLOCK_LEVEL_BATCH;
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else
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return SMB2_OPLOCK_LEVEL_EXCLUSIVE;
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} else if (lease_state & SMB2_LEASE_READ_CACHING)
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return SMB2_OPLOCK_LEVEL_II;
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return 0;
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}
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struct smb2_lease_break_work {
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struct work_struct lease_break;
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struct tcon_link *tlink;
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__u8 lease_key[16];
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__le32 lease_state;
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};
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static void
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cifs_ses_oplock_break(struct work_struct *work)
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{
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struct smb2_lease_break_work *lw = container_of(work,
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struct smb2_lease_break_work, lease_break);
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int rc;
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rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
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lw->lease_state);
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cifs_dbg(FYI, "Lease release rc %d\n", rc);
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cifs_put_tlink(lw->tlink);
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kfree(lw);
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}
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static bool
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smb2_is_valid_lease_break(char *buffer, struct TCP_Server_Info *server)
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{
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struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
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struct list_head *tmp, *tmp1, *tmp2;
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struct cifs_ses *ses;
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struct cifs_tcon *tcon;
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struct cifsInodeInfo *cinode;
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struct cifsFileInfo *cfile;
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struct cifs_pending_open *open;
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struct smb2_lease_break_work *lw;
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bool found;
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int ack_req = le32_to_cpu(rsp->Flags &
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SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
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lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
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if (!lw)
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return false;
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INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
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lw->lease_state = rsp->NewLeaseState;
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cifs_dbg(FYI, "Checking for lease break\n");
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/* look up tcon based on tid & uid */
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spin_lock(&cifs_tcp_ses_lock);
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list_for_each(tmp, &server->smb_ses_list) {
|
|
ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
|
|
|
|
spin_lock(&cifs_file_list_lock);
|
|
list_for_each(tmp1, &ses->tcon_list) {
|
|
tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
|
|
|
|
cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
|
|
list_for_each(tmp2, &tcon->openFileList) {
|
|
cfile = list_entry(tmp2, struct cifsFileInfo,
|
|
tlist);
|
|
cinode = CIFS_I(cfile->dentry->d_inode);
|
|
|
|
if (memcmp(cinode->lease_key, rsp->LeaseKey,
|
|
SMB2_LEASE_KEY_SIZE))
|
|
continue;
|
|
|
|
cifs_dbg(FYI, "found in the open list\n");
|
|
cifs_dbg(FYI, "lease key match, lease break 0x%d\n",
|
|
le32_to_cpu(rsp->NewLeaseState));
|
|
|
|
smb2_set_oplock_level(cinode,
|
|
smb2_map_lease_to_oplock(rsp->NewLeaseState));
|
|
|
|
if (ack_req)
|
|
cfile->oplock_break_cancelled = false;
|
|
else
|
|
cfile->oplock_break_cancelled = true;
|
|
|
|
queue_work(cifsiod_wq, &cfile->oplock_break);
|
|
|
|
spin_unlock(&cifs_file_list_lock);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return true;
|
|
}
|
|
|
|
found = false;
|
|
list_for_each_entry(open, &tcon->pending_opens, olist) {
|
|
if (memcmp(open->lease_key, rsp->LeaseKey,
|
|
SMB2_LEASE_KEY_SIZE))
|
|
continue;
|
|
|
|
if (!found && ack_req) {
|
|
found = true;
|
|
memcpy(lw->lease_key, open->lease_key,
|
|
SMB2_LEASE_KEY_SIZE);
|
|
lw->tlink = cifs_get_tlink(open->tlink);
|
|
queue_work(cifsiod_wq,
|
|
&lw->lease_break);
|
|
}
|
|
|
|
cifs_dbg(FYI, "found in the pending open list\n");
|
|
cifs_dbg(FYI, "lease key match, lease break 0x%d\n",
|
|
le32_to_cpu(rsp->NewLeaseState));
|
|
|
|
open->oplock =
|
|
smb2_map_lease_to_oplock(rsp->NewLeaseState);
|
|
}
|
|
if (found) {
|
|
spin_unlock(&cifs_file_list_lock);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return true;
|
|
}
|
|
}
|
|
spin_unlock(&cifs_file_list_lock);
|
|
}
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
kfree(lw);
|
|
cifs_dbg(FYI, "Can not process lease break - no lease matched\n");
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
|
|
{
|
|
struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer;
|
|
struct list_head *tmp, *tmp1, *tmp2;
|
|
struct cifs_ses *ses;
|
|
struct cifs_tcon *tcon;
|
|
struct cifsInodeInfo *cinode;
|
|
struct cifsFileInfo *cfile;
|
|
|
|
cifs_dbg(FYI, "Checking for oplock break\n");
|
|
|
|
if (rsp->hdr.Command != SMB2_OPLOCK_BREAK)
|
|
return false;
|
|
|
|
if (rsp->StructureSize !=
|
|
smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
|
|
if (le16_to_cpu(rsp->StructureSize) == 44)
|
|
return smb2_is_valid_lease_break(buffer, server);
|
|
else
|
|
return false;
|
|
}
|
|
|
|
cifs_dbg(FYI, "oplock level 0x%d\n", rsp->OplockLevel);
|
|
|
|
/* look up tcon based on tid & uid */
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
list_for_each(tmp, &server->smb_ses_list) {
|
|
ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
|
|
list_for_each(tmp1, &ses->tcon_list) {
|
|
tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
|
|
|
|
cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
|
|
spin_lock(&cifs_file_list_lock);
|
|
list_for_each(tmp2, &tcon->openFileList) {
|
|
cfile = list_entry(tmp2, struct cifsFileInfo,
|
|
tlist);
|
|
if (rsp->PersistentFid !=
|
|
cfile->fid.persistent_fid ||
|
|
rsp->VolatileFid !=
|
|
cfile->fid.volatile_fid)
|
|
continue;
|
|
|
|
cifs_dbg(FYI, "file id match, oplock break\n");
|
|
cinode = CIFS_I(cfile->dentry->d_inode);
|
|
|
|
if (!cinode->clientCanCacheAll &&
|
|
rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
|
|
cfile->oplock_break_cancelled = true;
|
|
else
|
|
cfile->oplock_break_cancelled = false;
|
|
|
|
smb2_set_oplock_level(cinode,
|
|
rsp->OplockLevel ? SMB2_OPLOCK_LEVEL_II : 0);
|
|
|
|
queue_work(cifsiod_wq, &cfile->oplock_break);
|
|
|
|
spin_unlock(&cifs_file_list_lock);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return true;
|
|
}
|
|
spin_unlock(&cifs_file_list_lock);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
cifs_dbg(FYI, "No matching file for oplock break\n");
|
|
return true;
|
|
}
|
|
}
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
|
|
return false;
|
|
}
|