blob: dfa5d9f4e00b689438b0c7e49ea9e3b974b0dfdd [file] [log] [blame]
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +04001/*
2 * fs/cifs/smb2misc.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2011
5 * Etersoft, 2012
6 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Pavel Shilovsky (pshilovsky@samba.org) 2012
8 *
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23#include <linux/ctype.h>
24#include "smb2pdu.h"
25#include "cifsglob.h"
26#include "cifsproto.h"
27#include "smb2proto.h"
28#include "cifs_debug.h"
29#include "cifs_unicode.h"
30#include "smb2status.h"
Pavel Shilovsky31473fc2016-10-24 15:33:04 -070031#include "smb2glob.h"
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040032
33static int
Pavel Shilovsky31473fc2016-10-24 15:33:04 -070034check_smb2_hdr(struct smb2_sync_hdr *shdr, __u64 mid)
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040035{
Pavel Shilovsky31473fc2016-10-24 15:33:04 -070036 __u64 wire_mid = le64_to_cpu(shdr->MessageId);
Sachin Prabhu9235d092014-12-09 17:37:00 +000037
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040038 /*
39 * Make sure that this really is an SMB, that it is a response,
40 * and that the message ids match.
41 */
Pavel Shilovsky31473fc2016-10-24 15:33:04 -070042 if ((shdr->ProtocolId == SMB2_PROTO_NUMBER) &&
Sachin Prabhu9235d092014-12-09 17:37:00 +000043 (mid == wire_mid)) {
Pavel Shilovsky31473fc2016-10-24 15:33:04 -070044 if (shdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040045 return 0;
46 else {
47 /* only one valid case where server sends us request */
Pavel Shilovsky31473fc2016-10-24 15:33:04 -070048 if (shdr->Command == SMB2_OPLOCK_BREAK)
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040049 return 0;
50 else
Joe Perchesf96637b2013-05-04 22:12:25 -050051 cifs_dbg(VFS, "Received Request not response\n");
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040052 }
53 } else { /* bad signature or mid */
Pavel Shilovsky31473fc2016-10-24 15:33:04 -070054 if (shdr->ProtocolId != SMB2_PROTO_NUMBER)
Joe Perchesf96637b2013-05-04 22:12:25 -050055 cifs_dbg(VFS, "Bad protocol string signature header %x\n",
Pavel Shilovsky31473fc2016-10-24 15:33:04 -070056 le32_to_cpu(shdr->ProtocolId));
Sachin Prabhu9235d092014-12-09 17:37:00 +000057 if (mid != wire_mid)
Joe Perchesf96637b2013-05-04 22:12:25 -050058 cifs_dbg(VFS, "Mids do not match: %llu and %llu\n",
Sachin Prabhu9235d092014-12-09 17:37:00 +000059 mid, wire_mid);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040060 }
Sachin Prabhu9235d092014-12-09 17:37:00 +000061 cifs_dbg(VFS, "Bad SMB detected. The Mid=%llu\n", wire_mid);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040062 return 1;
63}
64
65/*
66 * The following table defines the expected "StructureSize" of SMB2 responses
67 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS responses.
68 *
69 * Note that commands are defined in smb2pdu.h in le16 but the array below is
70 * indexed by command in host byte order
71 */
72static const __le16 smb2_rsp_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
Fabian Frederickbc09d142014-12-10 15:41:15 -080073 /* SMB2_NEGOTIATE */ cpu_to_le16(65),
74 /* SMB2_SESSION_SETUP */ cpu_to_le16(9),
75 /* SMB2_LOGOFF */ cpu_to_le16(4),
76 /* SMB2_TREE_CONNECT */ cpu_to_le16(16),
77 /* SMB2_TREE_DISCONNECT */ cpu_to_le16(4),
78 /* SMB2_CREATE */ cpu_to_le16(89),
79 /* SMB2_CLOSE */ cpu_to_le16(60),
80 /* SMB2_FLUSH */ cpu_to_le16(4),
81 /* SMB2_READ */ cpu_to_le16(17),
82 /* SMB2_WRITE */ cpu_to_le16(17),
83 /* SMB2_LOCK */ cpu_to_le16(4),
84 /* SMB2_IOCTL */ cpu_to_le16(49),
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040085 /* BB CHECK this ... not listed in documentation */
Fabian Frederickbc09d142014-12-10 15:41:15 -080086 /* SMB2_CANCEL */ cpu_to_le16(0),
87 /* SMB2_ECHO */ cpu_to_le16(4),
88 /* SMB2_QUERY_DIRECTORY */ cpu_to_le16(9),
89 /* SMB2_CHANGE_NOTIFY */ cpu_to_le16(9),
90 /* SMB2_QUERY_INFO */ cpu_to_le16(9),
91 /* SMB2_SET_INFO */ cpu_to_le16(2),
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040092 /* BB FIXME can also be 44 for lease break */
Fabian Frederickbc09d142014-12-10 15:41:15 -080093 /* SMB2_OPLOCK_BREAK */ cpu_to_le16(24)
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040094};
95
96int
Steve French373512e2015-12-18 13:05:30 -060097smb2_check_message(char *buf, unsigned int length, struct TCP_Server_Info *srvr)
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +040098{
Pavel Shilovsky31473fc2016-10-24 15:33:04 -070099 struct smb2_pdu *pdu = (struct smb2_pdu *)buf;
100 struct smb2_hdr *hdr = &pdu->hdr;
101 struct smb2_sync_hdr *shdr = get_sync_hdr(buf);
Steve French373512e2015-12-18 13:05:30 -0600102 __u64 mid;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400103 __u32 len = get_rfc1002_length(buf);
104 __u32 clc_len; /* calculated length */
105 int command;
106
107 /* BB disable following printk later */
Joe Perchesf96637b2013-05-04 22:12:25 -0500108 cifs_dbg(FYI, "%s length: 0x%x, smb_buf_length: 0x%x\n",
109 __func__, length, len);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400110
111 /*
112 * Add function to do table lookup of StructureSize by command
113 * ie Validate the wct via smb2_struct_sizes table above
114 */
115
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700116 if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
Steve French373512e2015-12-18 13:05:30 -0600117 struct smb2_transform_hdr *thdr =
118 (struct smb2_transform_hdr *)buf;
119 struct cifs_ses *ses = NULL;
120 struct list_head *tmp;
121
122 /* decrypt frame now that it is completely read in */
123 spin_lock(&cifs_tcp_ses_lock);
124 list_for_each(tmp, &srvr->smb_ses_list) {
125 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
126 if (ses->Suid == thdr->SessionId)
127 break;
128
129 ses = NULL;
130 }
131 spin_unlock(&cifs_tcp_ses_lock);
132 if (ses == NULL) {
133 cifs_dbg(VFS, "no decryption - session id not found\n");
134 return 1;
135 }
136 }
137
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700138 mid = le64_to_cpu(shdr->MessageId);
Pavel Shilovsky74112862012-07-27 01:20:41 +0400139 if (length < sizeof(struct smb2_pdu)) {
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700140 if ((length >= sizeof(struct smb2_hdr))
141 && (shdr->Status != 0)) {
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400142 pdu->StructureSize2 = 0;
143 /*
144 * As with SMB/CIFS, on some error cases servers may
145 * not return wct properly
146 */
147 return 0;
148 } else {
Joe Perchesf96637b2013-05-04 22:12:25 -0500149 cifs_dbg(VFS, "Length less than SMB header size\n");
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400150 }
151 return 1;
152 }
Ronnie Sahlberg93012bf2018-03-31 11:45:31 +1100153 if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE -
154 srvr->vals->header_preamble_size) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500155 cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n",
156 mid);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400157 return 1;
158 }
159
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700160 if (check_smb2_hdr(shdr, mid))
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400161 return 1;
162
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700163 if (shdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500164 cifs_dbg(VFS, "Illegal structure size %u\n",
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700165 le16_to_cpu(shdr->StructureSize));
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400166 return 1;
167 }
168
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700169 command = le16_to_cpu(shdr->Command);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400170 if (command >= NUMBER_OF_SMB2_COMMANDS) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500171 cifs_dbg(VFS, "Illegal SMB2 command %d\n", command);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400172 return 1;
173 }
174
175 if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700176 if (command != SMB2_OPLOCK_BREAK_HE && (shdr->Status == 0 ||
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700177 pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) {
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400178 /* error packets have 9 byte structure size */
Joe Perchesf96637b2013-05-04 22:12:25 -0500179 cifs_dbg(VFS, "Illegal response size %u for command %d\n",
180 le16_to_cpu(pdu->StructureSize2), command);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400181 return 1;
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700182 } else if (command == SMB2_OPLOCK_BREAK_HE
183 && (shdr->Status == 0)
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700184 && (le16_to_cpu(pdu->StructureSize2) != 44)
185 && (le16_to_cpu(pdu->StructureSize2) != 36)) {
186 /* special case for SMB2.1 lease break message */
Joe Perchesf96637b2013-05-04 22:12:25 -0500187 cifs_dbg(VFS, "Illegal response size %d for oplock break\n",
188 le16_to_cpu(pdu->StructureSize2));
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700189 return 1;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400190 }
191 }
192
Ronnie Sahlberg93012bf2018-03-31 11:45:31 +1100193 if (srvr->vals->header_preamble_size + len != length) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500194 cifs_dbg(VFS, "Total length %u RFC1002 length %u mismatch mid %llu\n",
Ronnie Sahlberg93012bf2018-03-31 11:45:31 +1100195 length, srvr->vals->header_preamble_size + len, mid);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400196 return 1;
197 }
198
199 clc_len = smb2_calc_size(hdr);
200
Ronnie Sahlberg93012bf2018-03-31 11:45:31 +1100201 if (srvr->vals->header_preamble_size + len != clc_len) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500202 cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n",
Ronnie Sahlberg93012bf2018-03-31 11:45:31 +1100203 clc_len, srvr->vals->header_preamble_size + len, mid);
Pavel Shilovskyb42bf882013-08-14 19:25:21 +0400204 /* create failed on symlink */
205 if (command == SMB2_CREATE_HE &&
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700206 shdr->Status == STATUS_STOPPED_ON_SYMLINK)
Pavel Shilovskyb42bf882013-08-14 19:25:21 +0400207 return 0;
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700208 /* Windows 7 server returns 24 bytes more */
Ronnie Sahlberg93012bf2018-03-31 11:45:31 +1100209 if (clc_len + 24 - srvr->vals->header_preamble_size == len && command == SMB2_OPLOCK_BREAK_HE)
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700210 return 0;
Steve French754789a2014-08-15 23:49:01 -0500211 /* server can return one byte more due to implied bcc[0] */
Ronnie Sahlberg93012bf2018-03-31 11:45:31 +1100212 if (clc_len == srvr->vals->header_preamble_size + len + 1)
Pavel Shilovsky74112862012-07-27 01:20:41 +0400213 return 0;
Steve French754789a2014-08-15 23:49:01 -0500214
215 /*
216 * MacOS server pads after SMB2.1 write response with 3 bytes
217 * of junk. Other servers match RFC1001 len to actual
218 * SMB2/SMB3 frame length (header + smb2 response specific data)
219 * Log the server error (once), but allow it and continue
220 * since the frame is parseable.
221 */
Ronnie Sahlberg93012bf2018-03-31 11:45:31 +1100222 if (clc_len < srvr->vals->header_preamble_size /* RFC1001 header size */ + len) {
Steve French754789a2014-08-15 23:49:01 -0500223 printk_once(KERN_WARNING
224 "SMB2 server sent bad RFC1001 len %d not %d\n",
Ronnie Sahlberg93012bf2018-03-31 11:45:31 +1100225 len, clc_len - srvr->vals->header_preamble_size);
Steve French754789a2014-08-15 23:49:01 -0500226 return 0;
227 }
228
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400229 return 1;
230 }
231 return 0;
232}
233
234/*
235 * The size of the variable area depends on the offset and length fields
236 * located in different fields for various SMB2 responses. SMB2 responses
237 * with no variable length info, show an offset of zero for the offset field.
238 */
239static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
240 /* SMB2_NEGOTIATE */ true,
241 /* SMB2_SESSION_SETUP */ true,
242 /* SMB2_LOGOFF */ false,
243 /* SMB2_TREE_CONNECT */ false,
244 /* SMB2_TREE_DISCONNECT */ false,
245 /* SMB2_CREATE */ true,
246 /* SMB2_CLOSE */ false,
247 /* SMB2_FLUSH */ false,
248 /* SMB2_READ */ true,
249 /* SMB2_WRITE */ false,
250 /* SMB2_LOCK */ false,
251 /* SMB2_IOCTL */ true,
252 /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
253 /* SMB2_ECHO */ false,
254 /* SMB2_QUERY_DIRECTORY */ true,
255 /* SMB2_CHANGE_NOTIFY */ true,
256 /* SMB2_QUERY_INFO */ true,
257 /* SMB2_SET_INFO */ false,
258 /* SMB2_OPLOCK_BREAK */ false
259};
260
261/*
262 * Returns the pointer to the beginning of the data area. Length of the data
263 * area and the offset to it (from the beginning of the smb are also returned.
264 */
Pavel Shilovskyec2e4522011-12-27 16:12:43 +0400265char *
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400266smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
267{
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700268 struct smb2_sync_hdr *shdr = get_sync_hdr(hdr);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400269 *off = 0;
270 *len = 0;
271
272 /* error responses do not have data area */
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700273 if (shdr->Status && shdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400274 (((struct smb2_err_rsp *)hdr)->StructureSize) ==
275 SMB2_ERROR_STRUCTURE_SIZE2)
276 return NULL;
277
278 /*
279 * Following commands have data areas so we have to get the location
280 * of the data buffer offset and data buffer length for the particular
281 * command.
282 */
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700283 switch (shdr->Command) {
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400284 case SMB2_NEGOTIATE:
Pavel Shilovskyec2e4522011-12-27 16:12:43 +0400285 *off = le16_to_cpu(
286 ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferOffset);
287 *len = le16_to_cpu(
288 ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferLength);
289 break;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400290 case SMB2_SESSION_SETUP:
Pavel Shilovsky5478f9b2011-12-27 16:22:00 +0400291 *off = le16_to_cpu(
292 ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferOffset);
293 *len = le16_to_cpu(
294 ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferLength);
295 break;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400296 case SMB2_CREATE:
Pavel Shilovsky2503a0d2011-12-26 22:58:46 +0400297 *off = le32_to_cpu(
298 ((struct smb2_create_rsp *)hdr)->CreateContextsOffset);
299 *len = le32_to_cpu(
300 ((struct smb2_create_rsp *)hdr)->CreateContextsLength);
301 break;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400302 case SMB2_QUERY_INFO:
Pavel Shilovskybe4cb9e2011-12-29 17:06:33 +0400303 *off = le16_to_cpu(
304 ((struct smb2_query_info_rsp *)hdr)->OutputBufferOffset);
305 *len = le32_to_cpu(
306 ((struct smb2_query_info_rsp *)hdr)->OutputBufferLength);
307 break;
308 case SMB2_READ:
Pavel Shilovsky09a47072012-09-18 16:20:29 -0700309 *off = ((struct smb2_read_rsp *)hdr)->DataOffset;
310 *len = le32_to_cpu(((struct smb2_read_rsp *)hdr)->DataLength);
311 break;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400312 case SMB2_QUERY_DIRECTORY:
Pavel Shilovskyd324f08d2012-09-18 16:20:33 -0700313 *off = le16_to_cpu(
314 ((struct smb2_query_directory_rsp *)hdr)->OutputBufferOffset);
315 *len = le32_to_cpu(
316 ((struct smb2_query_directory_rsp *)hdr)->OutputBufferLength);
317 break;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400318 case SMB2_IOCTL:
Steve French4a72daf2013-06-25 00:20:49 -0500319 *off = le32_to_cpu(
320 ((struct smb2_ioctl_rsp *)hdr)->OutputOffset);
321 *len = le32_to_cpu(((struct smb2_ioctl_rsp *)hdr)->OutputCount);
322 break;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400323 case SMB2_CHANGE_NOTIFY:
324 default:
325 /* BB FIXME for unimplemented cases above */
Joe Perchesf96637b2013-05-04 22:12:25 -0500326 cifs_dbg(VFS, "no length check for command\n");
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400327 break;
328 }
329
330 /*
331 * Invalid length or offset probably means data area is invalid, but
332 * we have little choice but to ignore the data area in this case.
333 */
334 if (*off > 4096) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500335 cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400336 *len = 0;
337 *off = 0;
338 } else if (*off < 0) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500339 cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n",
340 *off);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400341 *off = 0;
342 *len = 0;
343 } else if (*len < 0) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500344 cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n",
345 *len);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400346 *len = 0;
347 } else if (*len > 128 * 1024) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500348 cifs_dbg(VFS, "data area larger than 128K: %d\n", *len);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400349 *len = 0;
350 }
351
352 /* return pointer to beginning of data area, ie offset from SMB start */
353 if ((*off != 0) && (*len != 0))
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700354 return (char *)shdr + *off;
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400355 else
356 return NULL;
357}
358
359/*
360 * Calculate the size of the SMB message based on the fixed header
361 * portion, the number of word parameters and the data portion of the message.
362 */
363unsigned int
Pavel Shilovskyd324f08d2012-09-18 16:20:33 -0700364smb2_calc_size(void *buf)
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400365{
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700366 struct smb2_pdu *pdu = (struct smb2_pdu *)buf;
367 struct smb2_hdr *hdr = &pdu->hdr;
368 struct smb2_sync_hdr *shdr = get_sync_hdr(hdr);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400369 int offset; /* the offset from the beginning of SMB to data area */
370 int data_length; /* the length of the variable length data area */
371 /* Structure Size has already been checked to make sure it is 64 */
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700372 int len = 4 + le16_to_cpu(shdr->StructureSize);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400373
374 /*
375 * StructureSize2, ie length of fixed parameter area has already
376 * been checked to make sure it is the correct length.
377 */
378 len += le16_to_cpu(pdu->StructureSize2);
379
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700380 if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false)
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400381 goto calc_size_exit;
382
383 smb2_get_data_area_len(&offset, &data_length, hdr);
Joe Perchesf96637b2013-05-04 22:12:25 -0500384 cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400385
386 if (data_length > 0) {
387 /*
388 * Check to make sure that data area begins after fixed area,
389 * Note that last byte of the fixed area is part of data area
390 * for some commands, typically those with odd StructureSize,
391 * so we must add one to the calculation (and 4 to account for
392 * the size of the RFC1001 hdr.
393 */
394 if (offset + 4 + 1 < len) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500395 cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n",
396 offset + 4 + 1, len);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400397 data_length = 0;
398 } else {
399 len = 4 + offset + data_length;
400 }
401 }
402calc_size_exit:
Joe Perchesf96637b2013-05-04 22:12:25 -0500403 cifs_dbg(FYI, "SMB2 len %d\n", len);
Pavel Shilovsky093b2bd2011-06-08 15:51:07 +0400404 return len;
405}
Pavel Shilovsky2503a0d2011-12-26 22:58:46 +0400406
407/* Note: caller must free return buffer */
408__le16 *
409cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
410{
411 int len;
412 const char *start_of_path;
413 __le16 *to;
Steve Frencha4153cb2014-09-25 14:01:34 -0500414 int map_type;
415
416 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
417 map_type = SFM_MAP_UNI_RSVD;
418 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
419 map_type = SFU_MAP_UNI_RSVD;
420 else
421 map_type = NO_MAP_UNI_RSVD;
Pavel Shilovsky2503a0d2011-12-26 22:58:46 +0400422
423 /* Windows doesn't allow paths beginning with \ */
424 if (from[0] == '\\')
425 start_of_path = from + 1;
426 else
427 start_of_path = from;
428 to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
Steve Frencha4153cb2014-09-25 14:01:34 -0500429 cifs_sb->local_nls, map_type);
Pavel Shilovsky2503a0d2011-12-26 22:58:46 +0400430 return to;
431}
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700432
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700433__le32
434smb2_get_lease_state(struct cifsInodeInfo *cinode)
435{
Pavel Shilovsky53ef1012013-09-05 16:11:28 +0400436 __le32 lease = 0;
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700437
Pavel Shilovsky53ef1012013-09-05 16:11:28 +0400438 if (CIFS_CACHE_WRITE(cinode))
439 lease |= SMB2_LEASE_WRITE_CACHING;
440 if (CIFS_CACHE_HANDLE(cinode))
441 lease |= SMB2_LEASE_HANDLE_CACHING;
442 if (CIFS_CACHE_READ(cinode))
443 lease |= SMB2_LEASE_READ_CACHING;
444 return lease;
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700445}
446
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700447struct smb2_lease_break_work {
448 struct work_struct lease_break;
449 struct tcon_link *tlink;
450 __u8 lease_key[16];
451 __le32 lease_state;
452};
453
454static void
455cifs_ses_oplock_break(struct work_struct *work)
456{
457 struct smb2_lease_break_work *lw = container_of(work,
458 struct smb2_lease_break_work, lease_break);
459 int rc;
460
461 rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
462 lw->lease_state);
Joe Perchesf96637b2013-05-04 22:12:25 -0500463 cifs_dbg(FYI, "Lease release rc %d\n", rc);
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700464 cifs_put_tlink(lw->tlink);
465 kfree(lw);
466}
467
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700468static bool
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400469smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp,
470 struct smb2_lease_break_work *lw)
471{
472 bool found;
473 __u8 lease_state;
474 struct list_head *tmp;
475 struct cifsFileInfo *cfile;
Pavel Shilovsky42873b02013-09-05 21:30:16 +0400476 struct TCP_Server_Info *server = tcon->ses->server;
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400477 struct cifs_pending_open *open;
478 struct cifsInodeInfo *cinode;
479 int ack_req = le32_to_cpu(rsp->Flags &
480 SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
481
Pavel Shilovsky53ef1012013-09-05 16:11:28 +0400482 lease_state = le32_to_cpu(rsp->NewLeaseState);
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400483
484 list_for_each(tmp, &tcon->openFileList) {
485 cfile = list_entry(tmp, struct cifsFileInfo, tlist);
David Howells2b0143b2015-03-17 22:25:59 +0000486 cinode = CIFS_I(d_inode(cfile->dentry));
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400487
488 if (memcmp(cinode->lease_key, rsp->LeaseKey,
489 SMB2_LEASE_KEY_SIZE))
490 continue;
491
492 cifs_dbg(FYI, "found in the open list\n");
Steve French59b04c52014-08-02 21:16:48 -0500493 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400494 le32_to_cpu(rsp->NewLeaseState));
495
Pavel Shilovsky42873b02013-09-05 21:30:16 +0400496 server->ops->set_oplock_level(cinode, lease_state, 0, NULL);
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400497
498 if (ack_req)
499 cfile->oplock_break_cancelled = false;
500 else
501 cfile->oplock_break_cancelled = true;
502
Rabin Vincent3998e6b2017-05-03 17:54:01 +0200503 queue_work(cifsoplockd_wq, &cfile->oplock_break);
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400504 kfree(lw);
505 return true;
506 }
507
508 found = false;
509 list_for_each_entry(open, &tcon->pending_opens, olist) {
510 if (memcmp(open->lease_key, rsp->LeaseKey,
511 SMB2_LEASE_KEY_SIZE))
512 continue;
513
514 if (!found && ack_req) {
515 found = true;
516 memcpy(lw->lease_key, open->lease_key,
517 SMB2_LEASE_KEY_SIZE);
518 lw->tlink = cifs_get_tlink(open->tlink);
519 queue_work(cifsiod_wq, &lw->lease_break);
520 }
521
522 cifs_dbg(FYI, "found in the pending open list\n");
Steve French59b04c52014-08-02 21:16:48 -0500523 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400524 le32_to_cpu(rsp->NewLeaseState));
525
526 open->oplock = lease_state;
527 }
528 return found;
529}
530
531static bool
532smb2_is_valid_lease_break(char *buffer)
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700533{
534 struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
535 struct list_head *tmp, *tmp1, *tmp2;
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400536 struct TCP_Server_Info *server;
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700537 struct cifs_ses *ses;
538 struct cifs_tcon *tcon;
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700539 struct smb2_lease_break_work *lw;
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700540
541 lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
Joe Perchesf96637b2013-05-04 22:12:25 -0500542 if (!lw)
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700543 return false;
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700544
545 INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
546 lw->lease_state = rsp->NewLeaseState;
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700547
Joe Perchesf96637b2013-05-04 22:12:25 -0500548 cifs_dbg(FYI, "Checking for lease break\n");
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700549
550 /* look up tcon based on tid & uid */
551 spin_lock(&cifs_tcp_ses_lock);
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400552 list_for_each(tmp, &cifs_tcp_ses_list) {
553 server = list_entry(tmp, struct TCP_Server_Info, tcp_ses_list);
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700554
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400555 list_for_each(tmp1, &server->smb_ses_list) {
556 ses = list_entry(tmp1, struct cifs_ses, smb_ses_list);
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700557
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400558 list_for_each(tmp2, &ses->tcon_list) {
559 tcon = list_entry(tmp2, struct cifs_tcon,
560 tcon_list);
Steve French3afca262016-09-22 18:58:16 -0500561 spin_lock(&tcon->open_file_lock);
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400562 cifs_stats_inc(
563 &tcon->stats.cifs_stats.num_oplock_brks);
564 if (smb2_tcon_has_lease(tcon, rsp, lw)) {
Steve French3afca262016-09-22 18:58:16 -0500565 spin_unlock(&tcon->open_file_lock);
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400566 spin_unlock(&cifs_tcp_ses_lock);
567 return true;
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700568 }
Steve French3afca262016-09-22 18:58:16 -0500569 spin_unlock(&tcon->open_file_lock);
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700570 }
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700571 }
572 }
573 spin_unlock(&cifs_tcp_ses_lock);
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700574 kfree(lw);
Joe Perchesf96637b2013-05-04 22:12:25 -0500575 cifs_dbg(FYI, "Can not process lease break - no lease matched\n");
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700576 return false;
577}
578
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700579bool
580smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
581{
Ronnie Sahlberg21ad9482017-11-20 11:24:43 +1100582 struct smb2_oplock_break_rsp *rsp = (struct smb2_oplock_break_rsp *)buffer;
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700583 struct list_head *tmp, *tmp1, *tmp2;
584 struct cifs_ses *ses;
585 struct cifs_tcon *tcon;
586 struct cifsInodeInfo *cinode;
587 struct cifsFileInfo *cfile;
588
Joe Perchesf96637b2013-05-04 22:12:25 -0500589 cifs_dbg(FYI, "Checking for oplock break\n");
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700590
Pavel Shilovsky31473fc2016-10-24 15:33:04 -0700591 if (rsp->hdr.sync_hdr.Command != SMB2_OPLOCK_BREAK)
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700592 return false;
593
Steve French12e8a202012-09-19 09:19:39 -0700594 if (rsp->StructureSize !=
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700595 smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700596 if (le16_to_cpu(rsp->StructureSize) == 44)
Pavel Shilovsky933d4b32013-09-05 15:00:07 +0400597 return smb2_is_valid_lease_break(buffer);
Pavel Shilovsky0822f512012-09-19 06:22:45 -0700598 else
599 return false;
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700600 }
601
Steve French59b04c52014-08-02 21:16:48 -0500602 cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel);
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700603
604 /* look up tcon based on tid & uid */
605 spin_lock(&cifs_tcp_ses_lock);
606 list_for_each(tmp, &server->smb_ses_list) {
607 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
608 list_for_each(tmp1, &ses->tcon_list) {
609 tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
610
611 cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
Steve French3afca262016-09-22 18:58:16 -0500612 spin_lock(&tcon->open_file_lock);
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700613 list_for_each(tmp2, &tcon->openFileList) {
614 cfile = list_entry(tmp2, struct cifsFileInfo,
615 tlist);
616 if (rsp->PersistentFid !=
617 cfile->fid.persistent_fid ||
618 rsp->VolatileFid !=
619 cfile->fid.volatile_fid)
620 continue;
621
Joe Perchesf96637b2013-05-04 22:12:25 -0500622 cifs_dbg(FYI, "file id match, oplock break\n");
David Howells2b0143b2015-03-17 22:25:59 +0000623 cinode = CIFS_I(d_inode(cfile->dentry));
Steve French3afca262016-09-22 18:58:16 -0500624 spin_lock(&cfile->file_info_lock);
Pavel Shilovsky18cceb62013-09-05 13:01:06 +0400625 if (!CIFS_CACHE_WRITE(cinode) &&
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700626 rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
627 cfile->oplock_break_cancelled = true;
628 else
629 cfile->oplock_break_cancelled = false;
630
Sachin Prabhuc11f1df2014-03-11 16:11:47 +0000631 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
632 &cinode->flags);
633
634 /*
635 * Set flag if the server downgrades the oplock
636 * to L2 else clear.
637 */
638 if (rsp->OplockLevel)
639 set_bit(
640 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
641 &cinode->flags);
642 else
643 clear_bit(
644 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
645 &cinode->flags);
Steve French3afca262016-09-22 18:58:16 -0500646 spin_unlock(&cfile->file_info_lock);
Rabin Vincent3998e6b2017-05-03 17:54:01 +0200647 queue_work(cifsoplockd_wq,
648 &cfile->oplock_break);
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700649
Steve French3afca262016-09-22 18:58:16 -0500650 spin_unlock(&tcon->open_file_lock);
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700651 spin_unlock(&cifs_tcp_ses_lock);
652 return true;
653 }
Steve French3afca262016-09-22 18:58:16 -0500654 spin_unlock(&tcon->open_file_lock);
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700655 spin_unlock(&cifs_tcp_ses_lock);
Joe Perchesf96637b2013-05-04 22:12:25 -0500656 cifs_dbg(FYI, "No matching file for oplock break\n");
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700657 return true;
658 }
659 }
660 spin_unlock(&cifs_tcp_ses_lock);
Joe Perchesf96637b2013-05-04 22:12:25 -0500661 cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
Pavel Shilovsky983c88a2012-09-18 16:20:33 -0700662 return false;
663}
Sachin Prabhu38bd4902017-03-03 15:41:38 -0800664
665void
666smb2_cancelled_close_fid(struct work_struct *work)
667{
668 struct close_cancelled_open *cancelled = container_of(work,
669 struct close_cancelled_open, work);
670
671 cifs_dbg(VFS, "Close unmatched open\n");
672
673 SMB2_close(0, cancelled->tcon, cancelled->fid.persistent_fid,
674 cancelled->fid.volatile_fid);
675 cifs_put_tcon(cancelled->tcon);
676 kfree(cancelled);
677}
678
679int
680smb2_handle_cancelled_mid(char *buffer, struct TCP_Server_Info *server)
681{
682 struct smb2_sync_hdr *sync_hdr = get_sync_hdr(buffer);
683 struct smb2_create_rsp *rsp = (struct smb2_create_rsp *)buffer;
684 struct cifs_tcon *tcon;
685 struct close_cancelled_open *cancelled;
686
687 if (sync_hdr->Command != SMB2_CREATE ||
688 sync_hdr->Status != STATUS_SUCCESS)
689 return 0;
690
691 cancelled = kzalloc(sizeof(*cancelled), GFP_KERNEL);
692 if (!cancelled)
693 return -ENOMEM;
694
695 tcon = smb2_find_smb_tcon(server, sync_hdr->SessionId,
696 sync_hdr->TreeId);
697 if (!tcon) {
698 kfree(cancelled);
699 return -ENOENT;
700 }
701
702 cancelled->fid.persistent_fid = rsp->PersistentFileId;
703 cancelled->fid.volatile_fid = rsp->VolatileFileId;
704 cancelled->tcon = tcon;
705 INIT_WORK(&cancelled->work, smb2_cancelled_close_fid);
706 queue_work(cifsiod_wq, &cancelled->work);
707
708 return 0;
709}
Aurelien Aptel8bd68c62018-02-16 19:19:29 +0100710
711#ifdef CONFIG_CIFS_SMB311
712/**
713 * smb311_update_preauth_hash - update @ses hash with the packet data in @iov
714 *
715 * Assumes @iov does not contain the rfc1002 length and iov[0] has the
716 * SMB2 header.
717 */
718int
719smb311_update_preauth_hash(struct cifs_ses *ses, struct kvec *iov, int nvec)
720{
721 int i, rc;
722 struct sdesc *d;
723 struct smb2_sync_hdr *hdr;
724
725 if (ses->server->tcpStatus == CifsGood) {
726 /* skip non smb311 connections */
727 if (ses->server->dialect != SMB311_PROT_ID)
728 return 0;
729
730 /* skip last sess setup response */
731 hdr = (struct smb2_sync_hdr *)iov[0].iov_base;
732 if (hdr->Flags & SMB2_FLAGS_SIGNED)
733 return 0;
734 }
735
736 rc = smb311_crypto_shash_allocate(ses->server);
737 if (rc)
738 return rc;
739
740 d = ses->server->secmech.sdescsha512;
741 rc = crypto_shash_init(&d->shash);
742 if (rc) {
743 cifs_dbg(VFS, "%s: could not init sha512 shash\n", __func__);
744 return rc;
745 }
746
747 rc = crypto_shash_update(&d->shash, ses->preauth_sha_hash,
748 SMB2_PREAUTH_HASH_SIZE);
749 if (rc) {
750 cifs_dbg(VFS, "%s: could not update sha512 shash\n", __func__);
751 return rc;
752 }
753
754 for (i = 0; i < nvec; i++) {
755 rc = crypto_shash_update(&d->shash,
756 iov[i].iov_base, iov[i].iov_len);
757 if (rc) {
758 cifs_dbg(VFS, "%s: could not update sha512 shash\n",
759 __func__);
760 return rc;
761 }
762 }
763
764 rc = crypto_shash_final(&d->shash, ses->preauth_sha_hash);
765 if (rc) {
766 cifs_dbg(VFS, "%s: could not finalize sha512 shash\n",
767 __func__);
768 return rc;
769 }
770
771 return 0;
772}
773#endif