Commit | Line | Data |
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093b2bda PS |
1 | /* |
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" | |
31473fc4 | 31 | #include "smb2glob.h" |
093b2bda PS |
32 | |
33 | static int | |
31473fc4 | 34 | check_smb2_hdr(struct smb2_sync_hdr *shdr, __u64 mid) |
093b2bda | 35 | { |
31473fc4 | 36 | __u64 wire_mid = le64_to_cpu(shdr->MessageId); |
9235d098 | 37 | |
093b2bda PS |
38 | /* |
39 | * Make sure that this really is an SMB, that it is a response, | |
40 | * and that the message ids match. | |
41 | */ | |
31473fc4 | 42 | if ((shdr->ProtocolId == SMB2_PROTO_NUMBER) && |
9235d098 | 43 | (mid == wire_mid)) { |
31473fc4 | 44 | if (shdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR) |
093b2bda PS |
45 | return 0; |
46 | else { | |
47 | /* only one valid case where server sends us request */ | |
31473fc4 | 48 | if (shdr->Command == SMB2_OPLOCK_BREAK) |
093b2bda PS |
49 | return 0; |
50 | else | |
f96637be | 51 | cifs_dbg(VFS, "Received Request not response\n"); |
093b2bda PS |
52 | } |
53 | } else { /* bad signature or mid */ | |
31473fc4 | 54 | if (shdr->ProtocolId != SMB2_PROTO_NUMBER) |
f96637be | 55 | cifs_dbg(VFS, "Bad protocol string signature header %x\n", |
31473fc4 | 56 | le32_to_cpu(shdr->ProtocolId)); |
9235d098 | 57 | if (mid != wire_mid) |
f96637be | 58 | cifs_dbg(VFS, "Mids do not match: %llu and %llu\n", |
9235d098 | 59 | mid, wire_mid); |
093b2bda | 60 | } |
9235d098 | 61 | cifs_dbg(VFS, "Bad SMB detected. The Mid=%llu\n", wire_mid); |
093b2bda PS |
62 | 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 | */ | |
72 | static const __le16 smb2_rsp_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = { | |
bc09d141 FF |
73 | /* 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), | |
093b2bda | 85 | /* BB CHECK this ... not listed in documentation */ |
bc09d141 FF |
86 | /* 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), | |
093b2bda | 92 | /* BB FIXME can also be 44 for lease break */ |
bc09d141 | 93 | /* SMB2_OPLOCK_BREAK */ cpu_to_le16(24) |
093b2bda PS |
94 | }; |
95 | ||
98170fb5 | 96 | static __u32 get_neg_ctxt_len(struct smb2_sync_hdr *hdr, __u32 len, |
1fc6ad2f | 97 | __u32 non_ctxlen) |
136ff1b4 SF |
98 | { |
99 | __u16 neg_count; | |
100 | __u32 nc_offset, size_of_pad_before_neg_ctxts; | |
101 | struct smb2_negotiate_rsp *pneg_rsp = (struct smb2_negotiate_rsp *)hdr; | |
102 | ||
103 | /* Negotiate contexts are only valid for latest dialect SMB3.11 */ | |
104 | neg_count = le16_to_cpu(pneg_rsp->NegotiateContextCount); | |
105 | if ((neg_count == 0) || | |
106 | (pneg_rsp->DialectRevision != cpu_to_le16(SMB311_PROT_ID))) | |
107 | return 0; | |
108 | ||
109 | /* Make sure that negotiate contexts start after gss security blob */ | |
110 | nc_offset = le32_to_cpu(pneg_rsp->NegotiateContextOffset); | |
1fc6ad2f | 111 | if (nc_offset < non_ctxlen) { |
136ff1b4 SF |
112 | printk_once(KERN_WARNING "invalid negotiate context offset\n"); |
113 | return 0; | |
114 | } | |
1fc6ad2f | 115 | size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen; |
136ff1b4 SF |
116 | |
117 | /* Verify that at least minimal negotiate contexts fit within frame */ | |
118 | if (len < nc_offset + (neg_count * sizeof(struct smb2_neg_context))) { | |
119 | printk_once(KERN_WARNING "negotiate context goes beyond end\n"); | |
120 | return 0; | |
121 | } | |
122 | ||
123 | cifs_dbg(FYI, "length of negcontexts %d pad %d\n", | |
124 | len - nc_offset, size_of_pad_before_neg_ctxts); | |
125 | ||
126 | /* length of negcontexts including pad from end of sec blob to them */ | |
127 | return (len - nc_offset) + size_of_pad_before_neg_ctxts; | |
128 | } | |
136ff1b4 | 129 | |
093b2bda | 130 | int |
98170fb5 | 131 | smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *srvr) |
093b2bda | 132 | { |
1fc6ad2f | 133 | struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf; |
98170fb5 | 134 | struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)shdr; |
373512ec | 135 | __u64 mid; |
093b2bda PS |
136 | __u32 clc_len; /* calculated length */ |
137 | int command; | |
98170fb5 RS |
138 | int pdu_size = sizeof(struct smb2_sync_pdu); |
139 | int hdr_size = sizeof(struct smb2_sync_hdr); | |
093b2bda PS |
140 | |
141 | /* | |
142 | * Add function to do table lookup of StructureSize by command | |
143 | * ie Validate the wct via smb2_struct_sizes table above | |
144 | */ | |
31473fc4 | 145 | if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) { |
373512ec SF |
146 | struct smb2_transform_hdr *thdr = |
147 | (struct smb2_transform_hdr *)buf; | |
148 | struct cifs_ses *ses = NULL; | |
149 | struct list_head *tmp; | |
150 | ||
151 | /* decrypt frame now that it is completely read in */ | |
152 | spin_lock(&cifs_tcp_ses_lock); | |
153 | list_for_each(tmp, &srvr->smb_ses_list) { | |
154 | ses = list_entry(tmp, struct cifs_ses, smb_ses_list); | |
155 | if (ses->Suid == thdr->SessionId) | |
156 | break; | |
157 | ||
158 | ses = NULL; | |
159 | } | |
160 | spin_unlock(&cifs_tcp_ses_lock); | |
161 | if (ses == NULL) { | |
162 | cifs_dbg(VFS, "no decryption - session id not found\n"); | |
163 | return 1; | |
164 | } | |
165 | } | |
166 | ||
31473fc4 | 167 | mid = le64_to_cpu(shdr->MessageId); |
98170fb5 RS |
168 | if (len < pdu_size) { |
169 | if ((len >= hdr_size) | |
31473fc4 | 170 | && (shdr->Status != 0)) { |
093b2bda PS |
171 | pdu->StructureSize2 = 0; |
172 | /* | |
173 | * As with SMB/CIFS, on some error cases servers may | |
174 | * not return wct properly | |
175 | */ | |
176 | return 0; | |
177 | } else { | |
f96637be | 178 | cifs_dbg(VFS, "Length less than SMB header size\n"); |
093b2bda PS |
179 | } |
180 | return 1; | |
181 | } | |
1fc6ad2f | 182 | if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE) { |
f96637be JP |
183 | cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n", |
184 | mid); | |
093b2bda PS |
185 | return 1; |
186 | } | |
187 | ||
31473fc4 | 188 | if (check_smb2_hdr(shdr, mid)) |
093b2bda PS |
189 | return 1; |
190 | ||
31473fc4 | 191 | if (shdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) { |
f96637be | 192 | cifs_dbg(VFS, "Illegal structure size %u\n", |
31473fc4 | 193 | le16_to_cpu(shdr->StructureSize)); |
093b2bda PS |
194 | return 1; |
195 | } | |
196 | ||
31473fc4 | 197 | command = le16_to_cpu(shdr->Command); |
093b2bda | 198 | if (command >= NUMBER_OF_SMB2_COMMANDS) { |
f96637be | 199 | cifs_dbg(VFS, "Illegal SMB2 command %d\n", command); |
093b2bda PS |
200 | return 1; |
201 | } | |
202 | ||
203 | if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) { | |
31473fc4 | 204 | if (command != SMB2_OPLOCK_BREAK_HE && (shdr->Status == 0 || |
983c88a4 | 205 | pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) { |
093b2bda | 206 | /* error packets have 9 byte structure size */ |
f96637be JP |
207 | cifs_dbg(VFS, "Illegal response size %u for command %d\n", |
208 | le16_to_cpu(pdu->StructureSize2), command); | |
093b2bda | 209 | return 1; |
31473fc4 PS |
210 | } else if (command == SMB2_OPLOCK_BREAK_HE |
211 | && (shdr->Status == 0) | |
0822f514 PS |
212 | && (le16_to_cpu(pdu->StructureSize2) != 44) |
213 | && (le16_to_cpu(pdu->StructureSize2) != 36)) { | |
214 | /* special case for SMB2.1 lease break message */ | |
f96637be JP |
215 | cifs_dbg(VFS, "Illegal response size %d for oplock break\n", |
216 | le16_to_cpu(pdu->StructureSize2)); | |
0822f514 | 217 | return 1; |
093b2bda PS |
218 | } |
219 | } | |
220 | ||
98170fb5 | 221 | clc_len = smb2_calc_size(buf, srvr); |
093b2bda | 222 | |
136ff1b4 | 223 | if (shdr->Command == SMB2_NEGOTIATE) |
1fc6ad2f | 224 | clc_len += get_neg_ctxt_len(shdr, len, clc_len); |
0fdfef9a | 225 | |
98170fb5 RS |
226 | if (len != clc_len) { |
227 | cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n", | |
228 | clc_len, len, mid); | |
b42bf888 PS |
229 | /* create failed on symlink */ |
230 | if (command == SMB2_CREATE_HE && | |
31473fc4 | 231 | shdr->Status == STATUS_STOPPED_ON_SYMLINK) |
b42bf888 | 232 | return 0; |
983c88a4 | 233 | /* Windows 7 server returns 24 bytes more */ |
98170fb5 | 234 | if (clc_len + 24 == len && command == SMB2_OPLOCK_BREAK_HE) |
983c88a4 | 235 | return 0; |
754789a1 | 236 | /* server can return one byte more due to implied bcc[0] */ |
98170fb5 | 237 | if (clc_len == len + 1) |
74112860 | 238 | return 0; |
754789a1 | 239 | |
e6c47dd0 RS |
240 | /* |
241 | * Some windows servers (win2016) will pad also the final | |
242 | * PDU in a compound to 8 bytes. | |
243 | */ | |
244 | if (((clc_len + 7) & ~7) == len) | |
245 | return 0; | |
246 | ||
754789a1 SF |
247 | /* |
248 | * MacOS server pads after SMB2.1 write response with 3 bytes | |
249 | * of junk. Other servers match RFC1001 len to actual | |
250 | * SMB2/SMB3 frame length (header + smb2 response specific data) | |
25f25735 SF |
251 | * Some windows servers also pad up to 8 bytes when compounding. |
252 | * If pad is longer than eight bytes, log the server behavior | |
253 | * (once), since may indicate a problem but allow it and continue | |
754789a1 SF |
254 | * since the frame is parseable. |
255 | */ | |
98170fb5 | 256 | if (clc_len < len) { |
25f25735 SF |
257 | pr_warn_once( |
258 | "srv rsp padded more than expected. Length %d not %d for cmd:%d mid:%llu\n", | |
259 | len, clc_len, command, mid); | |
754789a1 SF |
260 | return 0; |
261 | } | |
25f25735 SF |
262 | pr_warn_once( |
263 | "srv rsp too short, len %d not %d. cmd:%d mid:%llu\n", | |
264 | len, clc_len, command, mid); | |
754789a1 | 265 | |
093b2bda PS |
266 | return 1; |
267 | } | |
268 | return 0; | |
269 | } | |
270 | ||
271 | /* | |
272 | * The size of the variable area depends on the offset and length fields | |
273 | * located in different fields for various SMB2 responses. SMB2 responses | |
274 | * with no variable length info, show an offset of zero for the offset field. | |
275 | */ | |
276 | static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = { | |
277 | /* SMB2_NEGOTIATE */ true, | |
278 | /* SMB2_SESSION_SETUP */ true, | |
279 | /* SMB2_LOGOFF */ false, | |
280 | /* SMB2_TREE_CONNECT */ false, | |
281 | /* SMB2_TREE_DISCONNECT */ false, | |
282 | /* SMB2_CREATE */ true, | |
283 | /* SMB2_CLOSE */ false, | |
284 | /* SMB2_FLUSH */ false, | |
285 | /* SMB2_READ */ true, | |
286 | /* SMB2_WRITE */ false, | |
287 | /* SMB2_LOCK */ false, | |
288 | /* SMB2_IOCTL */ true, | |
289 | /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */ | |
290 | /* SMB2_ECHO */ false, | |
291 | /* SMB2_QUERY_DIRECTORY */ true, | |
292 | /* SMB2_CHANGE_NOTIFY */ true, | |
293 | /* SMB2_QUERY_INFO */ true, | |
294 | /* SMB2_SET_INFO */ false, | |
295 | /* SMB2_OPLOCK_BREAK */ false | |
296 | }; | |
297 | ||
298 | /* | |
299 | * Returns the pointer to the beginning of the data area. Length of the data | |
300 | * area and the offset to it (from the beginning of the smb are also returned. | |
301 | */ | |
ec2e4523 | 302 | char * |
e4dc31fe | 303 | smb2_get_data_area_len(int *off, int *len, struct smb2_sync_hdr *shdr) |
093b2bda PS |
304 | { |
305 | *off = 0; | |
306 | *len = 0; | |
307 | ||
308 | /* error responses do not have data area */ | |
31473fc4 | 309 | if (shdr->Status && shdr->Status != STATUS_MORE_PROCESSING_REQUIRED && |
e4dc31fe | 310 | (((struct smb2_err_rsp *)shdr)->StructureSize) == |
093b2bda PS |
311 | SMB2_ERROR_STRUCTURE_SIZE2) |
312 | return NULL; | |
313 | ||
314 | /* | |
315 | * Following commands have data areas so we have to get the location | |
316 | * of the data buffer offset and data buffer length for the particular | |
317 | * command. | |
318 | */ | |
31473fc4 | 319 | switch (shdr->Command) { |
093b2bda | 320 | case SMB2_NEGOTIATE: |
ec2e4523 | 321 | *off = le16_to_cpu( |
e4dc31fe | 322 | ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferOffset); |
ec2e4523 | 323 | *len = le16_to_cpu( |
e4dc31fe | 324 | ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferLength); |
ec2e4523 | 325 | break; |
093b2bda | 326 | case SMB2_SESSION_SETUP: |
5478f9ba | 327 | *off = le16_to_cpu( |
e4dc31fe | 328 | ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferOffset); |
5478f9ba | 329 | *len = le16_to_cpu( |
e4dc31fe | 330 | ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferLength); |
5478f9ba | 331 | break; |
093b2bda | 332 | case SMB2_CREATE: |
2503a0db | 333 | *off = le32_to_cpu( |
e4dc31fe | 334 | ((struct smb2_create_rsp *)shdr)->CreateContextsOffset); |
2503a0db | 335 | *len = le32_to_cpu( |
e4dc31fe | 336 | ((struct smb2_create_rsp *)shdr)->CreateContextsLength); |
2503a0db | 337 | break; |
093b2bda | 338 | case SMB2_QUERY_INFO: |
be4cb9e3 | 339 | *off = le16_to_cpu( |
e4dc31fe | 340 | ((struct smb2_query_info_rsp *)shdr)->OutputBufferOffset); |
be4cb9e3 | 341 | *len = le32_to_cpu( |
e4dc31fe | 342 | ((struct smb2_query_info_rsp *)shdr)->OutputBufferLength); |
be4cb9e3 PS |
343 | break; |
344 | case SMB2_READ: | |
e4dc31fe RS |
345 | /* TODO: is this a bug ? */ |
346 | *off = ((struct smb2_read_rsp *)shdr)->DataOffset; | |
347 | *len = le32_to_cpu(((struct smb2_read_rsp *)shdr)->DataLength); | |
09a4707e | 348 | break; |
093b2bda | 349 | case SMB2_QUERY_DIRECTORY: |
d324f08d | 350 | *off = le16_to_cpu( |
e4dc31fe | 351 | ((struct smb2_query_directory_rsp *)shdr)->OutputBufferOffset); |
d324f08d | 352 | *len = le32_to_cpu( |
e4dc31fe | 353 | ((struct smb2_query_directory_rsp *)shdr)->OutputBufferLength); |
d324f08d | 354 | break; |
093b2bda | 355 | case SMB2_IOCTL: |
4a72dafa | 356 | *off = le32_to_cpu( |
e4dc31fe RS |
357 | ((struct smb2_ioctl_rsp *)shdr)->OutputOffset); |
358 | *len = le32_to_cpu( | |
359 | ((struct smb2_ioctl_rsp *)shdr)->OutputCount); | |
4a72dafa | 360 | break; |
093b2bda PS |
361 | case SMB2_CHANGE_NOTIFY: |
362 | default: | |
363 | /* BB FIXME for unimplemented cases above */ | |
f96637be | 364 | cifs_dbg(VFS, "no length check for command\n"); |
093b2bda PS |
365 | break; |
366 | } | |
367 | ||
368 | /* | |
369 | * Invalid length or offset probably means data area is invalid, but | |
370 | * we have little choice but to ignore the data area in this case. | |
371 | */ | |
372 | if (*off > 4096) { | |
f96637be | 373 | cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off); |
093b2bda PS |
374 | *len = 0; |
375 | *off = 0; | |
376 | } else if (*off < 0) { | |
f96637be JP |
377 | cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n", |
378 | *off); | |
093b2bda PS |
379 | *off = 0; |
380 | *len = 0; | |
381 | } else if (*len < 0) { | |
f96637be JP |
382 | cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n", |
383 | *len); | |
093b2bda PS |
384 | *len = 0; |
385 | } else if (*len > 128 * 1024) { | |
f96637be | 386 | cifs_dbg(VFS, "data area larger than 128K: %d\n", *len); |
093b2bda PS |
387 | *len = 0; |
388 | } | |
389 | ||
390 | /* return pointer to beginning of data area, ie offset from SMB start */ | |
391 | if ((*off != 0) && (*len != 0)) | |
31473fc4 | 392 | return (char *)shdr + *off; |
093b2bda PS |
393 | else |
394 | return NULL; | |
395 | } | |
396 | ||
397 | /* | |
398 | * Calculate the size of the SMB message based on the fixed header | |
399 | * portion, the number of word parameters and the data portion of the message. | |
400 | */ | |
401 | unsigned int | |
9ec672bd | 402 | smb2_calc_size(void *buf, struct TCP_Server_Info *srvr) |
093b2bda | 403 | { |
84f0cbfb RS |
404 | struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)buf; |
405 | struct smb2_sync_hdr *shdr = &pdu->sync_hdr; | |
093b2bda PS |
406 | int offset; /* the offset from the beginning of SMB to data area */ |
407 | int data_length; /* the length of the variable length data area */ | |
408 | /* Structure Size has already been checked to make sure it is 64 */ | |
1fc6ad2f | 409 | int len = le16_to_cpu(shdr->StructureSize); |
093b2bda PS |
410 | |
411 | /* | |
412 | * StructureSize2, ie length of fixed parameter area has already | |
413 | * been checked to make sure it is the correct length. | |
414 | */ | |
415 | len += le16_to_cpu(pdu->StructureSize2); | |
416 | ||
31473fc4 | 417 | if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false) |
093b2bda PS |
418 | goto calc_size_exit; |
419 | ||
e4dc31fe | 420 | smb2_get_data_area_len(&offset, &data_length, shdr); |
f96637be | 421 | cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset); |
093b2bda PS |
422 | |
423 | if (data_length > 0) { | |
424 | /* | |
425 | * Check to make sure that data area begins after fixed area, | |
426 | * Note that last byte of the fixed area is part of data area | |
427 | * for some commands, typically those with odd StructureSize, | |
84f0cbfb | 428 | * so we must add one to the calculation. |
093b2bda | 429 | */ |
1fc6ad2f RS |
430 | if (offset + 1 < len) { |
431 | cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n", | |
432 | offset + 1, len); | |
093b2bda PS |
433 | data_length = 0; |
434 | } else { | |
1fc6ad2f | 435 | len = offset + data_length; |
093b2bda PS |
436 | } |
437 | } | |
438 | calc_size_exit: | |
f96637be | 439 | cifs_dbg(FYI, "SMB2 len %d\n", len); |
093b2bda PS |
440 | return len; |
441 | } | |
2503a0db PS |
442 | |
443 | /* Note: caller must free return buffer */ | |
444 | __le16 * | |
445 | cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb) | |
446 | { | |
447 | int len; | |
448 | const char *start_of_path; | |
449 | __le16 *to; | |
a4153cb1 SF |
450 | int map_type; |
451 | ||
452 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR) | |
453 | map_type = SFM_MAP_UNI_RSVD; | |
454 | else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR) | |
455 | map_type = SFU_MAP_UNI_RSVD; | |
456 | else | |
457 | map_type = NO_MAP_UNI_RSVD; | |
2503a0db PS |
458 | |
459 | /* Windows doesn't allow paths beginning with \ */ | |
460 | if (from[0] == '\\') | |
461 | start_of_path = from + 1; | |
0fdfef9a | 462 | |
ce558b0e | 463 | /* SMB311 POSIX extensions paths do not include leading slash */ |
8ddecf5f | 464 | else if (cifs_sb_master_tlink(cifs_sb) && |
d819d298 SF |
465 | cifs_sb_master_tcon(cifs_sb)->posix_extensions && |
466 | (from[0] == '/')) { | |
ce558b0e | 467 | start_of_path = from + 1; |
0fdfef9a | 468 | } else |
2503a0db | 469 | start_of_path = from; |
ce558b0e | 470 | |
2503a0db | 471 | to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len, |
a4153cb1 | 472 | cifs_sb->local_nls, map_type); |
2503a0db PS |
473 | return to; |
474 | } | |
983c88a4 | 475 | |
0822f514 PS |
476 | __le32 |
477 | smb2_get_lease_state(struct cifsInodeInfo *cinode) | |
478 | { | |
53ef1016 | 479 | __le32 lease = 0; |
0822f514 | 480 | |
53ef1016 PS |
481 | if (CIFS_CACHE_WRITE(cinode)) |
482 | lease |= SMB2_LEASE_WRITE_CACHING; | |
483 | if (CIFS_CACHE_HANDLE(cinode)) | |
484 | lease |= SMB2_LEASE_HANDLE_CACHING; | |
485 | if (CIFS_CACHE_READ(cinode)) | |
486 | lease |= SMB2_LEASE_READ_CACHING; | |
487 | return lease; | |
0822f514 PS |
488 | } |
489 | ||
233839b1 PS |
490 | struct smb2_lease_break_work { |
491 | struct work_struct lease_break; | |
492 | struct tcon_link *tlink; | |
493 | __u8 lease_key[16]; | |
494 | __le32 lease_state; | |
495 | }; | |
496 | ||
497 | static void | |
498 | cifs_ses_oplock_break(struct work_struct *work) | |
499 | { | |
500 | struct smb2_lease_break_work *lw = container_of(work, | |
501 | struct smb2_lease_break_work, lease_break); | |
a93864d9 | 502 | int rc = 0; |
233839b1 PS |
503 | |
504 | rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key, | |
505 | lw->lease_state); | |
a93864d9 | 506 | |
f96637be | 507 | cifs_dbg(FYI, "Lease release rc %d\n", rc); |
233839b1 PS |
508 | cifs_put_tlink(lw->tlink); |
509 | kfree(lw); | |
510 | } | |
511 | ||
0822f514 | 512 | static bool |
933d4b36 PS |
513 | smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp, |
514 | struct smb2_lease_break_work *lw) | |
515 | { | |
516 | bool found; | |
517 | __u8 lease_state; | |
518 | struct list_head *tmp; | |
519 | struct cifsFileInfo *cfile; | |
520 | struct cifs_pending_open *open; | |
521 | struct cifsInodeInfo *cinode; | |
522 | int ack_req = le32_to_cpu(rsp->Flags & | |
523 | SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED); | |
524 | ||
53ef1016 | 525 | lease_state = le32_to_cpu(rsp->NewLeaseState); |
933d4b36 PS |
526 | |
527 | list_for_each(tmp, &tcon->openFileList) { | |
528 | cfile = list_entry(tmp, struct cifsFileInfo, tlist); | |
2b0143b5 | 529 | cinode = CIFS_I(d_inode(cfile->dentry)); |
933d4b36 PS |
530 | |
531 | if (memcmp(cinode->lease_key, rsp->LeaseKey, | |
532 | SMB2_LEASE_KEY_SIZE)) | |
533 | continue; | |
534 | ||
535 | cifs_dbg(FYI, "found in the open list\n"); | |
59b04c5d | 536 | cifs_dbg(FYI, "lease key match, lease break 0x%x\n", |
933d4b36 PS |
537 | le32_to_cpu(rsp->NewLeaseState)); |
538 | ||
933d4b36 PS |
539 | if (ack_req) |
540 | cfile->oplock_break_cancelled = false; | |
541 | else | |
542 | cfile->oplock_break_cancelled = true; | |
543 | ||
7b9b9edb PS |
544 | set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags); |
545 | ||
546 | /* | |
547 | * Set or clear flags depending on the lease state being READ. | |
548 | * HANDLE caching flag should be added when the client starts | |
549 | * to defer closing remote file handles with HANDLE leases. | |
550 | */ | |
551 | if (lease_state & SMB2_LEASE_READ_CACHING_HE) | |
552 | set_bit(CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, | |
553 | &cinode->flags); | |
554 | else | |
555 | clear_bit(CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, | |
556 | &cinode->flags); | |
557 | ||
3998e6b8 | 558 | queue_work(cifsoplockd_wq, &cfile->oplock_break); |
933d4b36 PS |
559 | kfree(lw); |
560 | return true; | |
561 | } | |
562 | ||
563 | found = false; | |
564 | list_for_each_entry(open, &tcon->pending_opens, olist) { | |
565 | if (memcmp(open->lease_key, rsp->LeaseKey, | |
566 | SMB2_LEASE_KEY_SIZE)) | |
567 | continue; | |
568 | ||
569 | if (!found && ack_req) { | |
570 | found = true; | |
571 | memcpy(lw->lease_key, open->lease_key, | |
572 | SMB2_LEASE_KEY_SIZE); | |
573 | lw->tlink = cifs_get_tlink(open->tlink); | |
574 | queue_work(cifsiod_wq, &lw->lease_break); | |
575 | } | |
576 | ||
577 | cifs_dbg(FYI, "found in the pending open list\n"); | |
59b04c5d | 578 | cifs_dbg(FYI, "lease key match, lease break 0x%x\n", |
933d4b36 PS |
579 | le32_to_cpu(rsp->NewLeaseState)); |
580 | ||
581 | open->oplock = lease_state; | |
582 | } | |
a93864d9 | 583 | |
933d4b36 PS |
584 | return found; |
585 | } | |
586 | ||
587 | static bool | |
588 | smb2_is_valid_lease_break(char *buffer) | |
0822f514 PS |
589 | { |
590 | struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer; | |
591 | struct list_head *tmp, *tmp1, *tmp2; | |
933d4b36 | 592 | struct TCP_Server_Info *server; |
0822f514 PS |
593 | struct cifs_ses *ses; |
594 | struct cifs_tcon *tcon; | |
233839b1 | 595 | struct smb2_lease_break_work *lw; |
233839b1 PS |
596 | |
597 | lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL); | |
f96637be | 598 | if (!lw) |
233839b1 | 599 | return false; |
233839b1 PS |
600 | |
601 | INIT_WORK(&lw->lease_break, cifs_ses_oplock_break); | |
602 | lw->lease_state = rsp->NewLeaseState; | |
0822f514 | 603 | |
f96637be | 604 | cifs_dbg(FYI, "Checking for lease break\n"); |
0822f514 PS |
605 | |
606 | /* look up tcon based on tid & uid */ | |
607 | spin_lock(&cifs_tcp_ses_lock); | |
933d4b36 PS |
608 | list_for_each(tmp, &cifs_tcp_ses_list) { |
609 | server = list_entry(tmp, struct TCP_Server_Info, tcp_ses_list); | |
0822f514 | 610 | |
933d4b36 PS |
611 | list_for_each(tmp1, &server->smb_ses_list) { |
612 | ses = list_entry(tmp1, struct cifs_ses, smb_ses_list); | |
0822f514 | 613 | |
933d4b36 PS |
614 | list_for_each(tmp2, &ses->tcon_list) { |
615 | tcon = list_entry(tmp2, struct cifs_tcon, | |
616 | tcon_list); | |
3afca265 | 617 | spin_lock(&tcon->open_file_lock); |
933d4b36 PS |
618 | cifs_stats_inc( |
619 | &tcon->stats.cifs_stats.num_oplock_brks); | |
620 | if (smb2_tcon_has_lease(tcon, rsp, lw)) { | |
3afca265 | 621 | spin_unlock(&tcon->open_file_lock); |
933d4b36 PS |
622 | spin_unlock(&cifs_tcp_ses_lock); |
623 | return true; | |
233839b1 | 624 | } |
3afca265 | 625 | spin_unlock(&tcon->open_file_lock); |
a93864d9 RS |
626 | |
627 | if (tcon->crfid.is_valid && | |
628 | !memcmp(rsp->LeaseKey, | |
629 | tcon->crfid.fid->lease_key, | |
630 | SMB2_LEASE_KEY_SIZE)) { | |
631 | INIT_WORK(&tcon->crfid.lease_break, | |
632 | smb2_cached_lease_break); | |
633 | queue_work(cifsiod_wq, | |
634 | &tcon->crfid.lease_break); | |
635 | spin_unlock(&cifs_tcp_ses_lock); | |
636 | return true; | |
637 | } | |
233839b1 | 638 | } |
0822f514 PS |
639 | } |
640 | } | |
641 | spin_unlock(&cifs_tcp_ses_lock); | |
233839b1 | 642 | kfree(lw); |
f96637be | 643 | cifs_dbg(FYI, "Can not process lease break - no lease matched\n"); |
0822f514 PS |
644 | return false; |
645 | } | |
646 | ||
983c88a4 PS |
647 | bool |
648 | smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server) | |
649 | { | |
0d5a288d | 650 | struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer; |
983c88a4 PS |
651 | struct list_head *tmp, *tmp1, *tmp2; |
652 | struct cifs_ses *ses; | |
653 | struct cifs_tcon *tcon; | |
654 | struct cifsInodeInfo *cinode; | |
655 | struct cifsFileInfo *cfile; | |
656 | ||
f96637be | 657 | cifs_dbg(FYI, "Checking for oplock break\n"); |
983c88a4 | 658 | |
0d5a288d | 659 | if (rsp->sync_hdr.Command != SMB2_OPLOCK_BREAK) |
983c88a4 PS |
660 | return false; |
661 | ||
12e8a208 | 662 | if (rsp->StructureSize != |
983c88a4 | 663 | smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) { |
0822f514 | 664 | if (le16_to_cpu(rsp->StructureSize) == 44) |
933d4b36 | 665 | return smb2_is_valid_lease_break(buffer); |
0822f514 PS |
666 | else |
667 | return false; | |
983c88a4 PS |
668 | } |
669 | ||
59b04c5d | 670 | cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel); |
983c88a4 PS |
671 | |
672 | /* look up tcon based on tid & uid */ | |
673 | spin_lock(&cifs_tcp_ses_lock); | |
674 | list_for_each(tmp, &server->smb_ses_list) { | |
675 | ses = list_entry(tmp, struct cifs_ses, smb_ses_list); | |
676 | list_for_each(tmp1, &ses->tcon_list) { | |
677 | tcon = list_entry(tmp1, struct cifs_tcon, tcon_list); | |
678 | ||
679 | cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks); | |
3afca265 | 680 | spin_lock(&tcon->open_file_lock); |
983c88a4 PS |
681 | list_for_each(tmp2, &tcon->openFileList) { |
682 | cfile = list_entry(tmp2, struct cifsFileInfo, | |
683 | tlist); | |
684 | if (rsp->PersistentFid != | |
685 | cfile->fid.persistent_fid || | |
686 | rsp->VolatileFid != | |
687 | cfile->fid.volatile_fid) | |
688 | continue; | |
689 | ||
f96637be | 690 | cifs_dbg(FYI, "file id match, oplock break\n"); |
2b0143b5 | 691 | cinode = CIFS_I(d_inode(cfile->dentry)); |
3afca265 | 692 | spin_lock(&cfile->file_info_lock); |
18cceb6a | 693 | if (!CIFS_CACHE_WRITE(cinode) && |
983c88a4 PS |
694 | rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE) |
695 | cfile->oplock_break_cancelled = true; | |
696 | else | |
697 | cfile->oplock_break_cancelled = false; | |
698 | ||
c11f1df5 SP |
699 | set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, |
700 | &cinode->flags); | |
701 | ||
702 | /* | |
703 | * Set flag if the server downgrades the oplock | |
704 | * to L2 else clear. | |
705 | */ | |
706 | if (rsp->OplockLevel) | |
707 | set_bit( | |
708 | CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, | |
709 | &cinode->flags); | |
710 | else | |
711 | clear_bit( | |
712 | CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, | |
713 | &cinode->flags); | |
3afca265 | 714 | spin_unlock(&cfile->file_info_lock); |
3998e6b8 RV |
715 | queue_work(cifsoplockd_wq, |
716 | &cfile->oplock_break); | |
983c88a4 | 717 | |
3afca265 | 718 | spin_unlock(&tcon->open_file_lock); |
983c88a4 PS |
719 | spin_unlock(&cifs_tcp_ses_lock); |
720 | return true; | |
721 | } | |
3afca265 | 722 | spin_unlock(&tcon->open_file_lock); |
983c88a4 | 723 | spin_unlock(&cifs_tcp_ses_lock); |
f96637be | 724 | cifs_dbg(FYI, "No matching file for oplock break\n"); |
983c88a4 PS |
725 | return true; |
726 | } | |
727 | } | |
728 | spin_unlock(&cifs_tcp_ses_lock); | |
f96637be | 729 | cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n"); |
983c88a4 PS |
730 | return false; |
731 | } | |
38bd4906 SP |
732 | |
733 | void | |
734 | smb2_cancelled_close_fid(struct work_struct *work) | |
735 | { | |
736 | struct close_cancelled_open *cancelled = container_of(work, | |
737 | struct close_cancelled_open, work); | |
738 | ||
739 | cifs_dbg(VFS, "Close unmatched open\n"); | |
740 | ||
741 | SMB2_close(0, cancelled->tcon, cancelled->fid.persistent_fid, | |
742 | cancelled->fid.volatile_fid); | |
743 | cifs_put_tcon(cancelled->tcon); | |
744 | kfree(cancelled); | |
745 | } | |
746 | ||
747 | int | |
748 | smb2_handle_cancelled_mid(char *buffer, struct TCP_Server_Info *server) | |
749 | { | |
49f466bd | 750 | struct smb2_sync_hdr *sync_hdr = (struct smb2_sync_hdr *)buffer; |
38bd4906 SP |
751 | struct smb2_create_rsp *rsp = (struct smb2_create_rsp *)buffer; |
752 | struct cifs_tcon *tcon; | |
753 | struct close_cancelled_open *cancelled; | |
754 | ||
755 | if (sync_hdr->Command != SMB2_CREATE || | |
756 | sync_hdr->Status != STATUS_SUCCESS) | |
757 | return 0; | |
758 | ||
759 | cancelled = kzalloc(sizeof(*cancelled), GFP_KERNEL); | |
760 | if (!cancelled) | |
761 | return -ENOMEM; | |
762 | ||
763 | tcon = smb2_find_smb_tcon(server, sync_hdr->SessionId, | |
764 | sync_hdr->TreeId); | |
765 | if (!tcon) { | |
766 | kfree(cancelled); | |
767 | return -ENOENT; | |
768 | } | |
769 | ||
770 | cancelled->fid.persistent_fid = rsp->PersistentFileId; | |
771 | cancelled->fid.volatile_fid = rsp->VolatileFileId; | |
772 | cancelled->tcon = tcon; | |
773 | INIT_WORK(&cancelled->work, smb2_cancelled_close_fid); | |
774 | queue_work(cifsiod_wq, &cancelled->work); | |
775 | ||
776 | return 0; | |
777 | } | |
8bd68c6e | 778 | |
8bd68c6e AA |
779 | /** |
780 | * smb311_update_preauth_hash - update @ses hash with the packet data in @iov | |
781 | * | |
782 | * Assumes @iov does not contain the rfc1002 length and iov[0] has the | |
783 | * SMB2 header. | |
784 | */ | |
785 | int | |
786 | smb311_update_preauth_hash(struct cifs_ses *ses, struct kvec *iov, int nvec) | |
787 | { | |
788 | int i, rc; | |
789 | struct sdesc *d; | |
790 | struct smb2_sync_hdr *hdr; | |
791 | ||
792 | if (ses->server->tcpStatus == CifsGood) { | |
793 | /* skip non smb311 connections */ | |
794 | if (ses->server->dialect != SMB311_PROT_ID) | |
795 | return 0; | |
796 | ||
797 | /* skip last sess setup response */ | |
798 | hdr = (struct smb2_sync_hdr *)iov[0].iov_base; | |
799 | if (hdr->Flags & SMB2_FLAGS_SIGNED) | |
800 | return 0; | |
801 | } | |
802 | ||
803 | rc = smb311_crypto_shash_allocate(ses->server); | |
804 | if (rc) | |
805 | return rc; | |
806 | ||
807 | d = ses->server->secmech.sdescsha512; | |
808 | rc = crypto_shash_init(&d->shash); | |
809 | if (rc) { | |
810 | cifs_dbg(VFS, "%s: could not init sha512 shash\n", __func__); | |
811 | return rc; | |
812 | } | |
813 | ||
814 | rc = crypto_shash_update(&d->shash, ses->preauth_sha_hash, | |
815 | SMB2_PREAUTH_HASH_SIZE); | |
816 | if (rc) { | |
817 | cifs_dbg(VFS, "%s: could not update sha512 shash\n", __func__); | |
818 | return rc; | |
819 | } | |
820 | ||
821 | for (i = 0; i < nvec; i++) { | |
822 | rc = crypto_shash_update(&d->shash, | |
823 | iov[i].iov_base, iov[i].iov_len); | |
824 | if (rc) { | |
825 | cifs_dbg(VFS, "%s: could not update sha512 shash\n", | |
826 | __func__); | |
827 | return rc; | |
828 | } | |
829 | } | |
830 | ||
831 | rc = crypto_shash_final(&d->shash, ses->preauth_sha_hash); | |
832 | if (rc) { | |
833 | cifs_dbg(VFS, "%s: could not finalize sha512 shash\n", | |
834 | __func__); | |
835 | return rc; | |
836 | } | |
837 | ||
838 | return 0; | |
839 | } |