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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 | ||
136ff1b4 | 96 | #ifdef CONFIG_CIFS_SMB311 |
98170fb5 | 97 | static __u32 get_neg_ctxt_len(struct smb2_sync_hdr *hdr, __u32 len, |
1fc6ad2f | 98 | __u32 non_ctxlen) |
136ff1b4 SF |
99 | { |
100 | __u16 neg_count; | |
101 | __u32 nc_offset, size_of_pad_before_neg_ctxts; | |
102 | struct smb2_negotiate_rsp *pneg_rsp = (struct smb2_negotiate_rsp *)hdr; | |
103 | ||
104 | /* Negotiate contexts are only valid for latest dialect SMB3.11 */ | |
105 | neg_count = le16_to_cpu(pneg_rsp->NegotiateContextCount); | |
106 | if ((neg_count == 0) || | |
107 | (pneg_rsp->DialectRevision != cpu_to_le16(SMB311_PROT_ID))) | |
108 | return 0; | |
109 | ||
110 | /* Make sure that negotiate contexts start after gss security blob */ | |
111 | nc_offset = le32_to_cpu(pneg_rsp->NegotiateContextOffset); | |
1fc6ad2f | 112 | if (nc_offset < non_ctxlen) { |
136ff1b4 SF |
113 | printk_once(KERN_WARNING "invalid negotiate context offset\n"); |
114 | return 0; | |
115 | } | |
1fc6ad2f | 116 | size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen; |
136ff1b4 SF |
117 | |
118 | /* Verify that at least minimal negotiate contexts fit within frame */ | |
119 | if (len < nc_offset + (neg_count * sizeof(struct smb2_neg_context))) { | |
120 | printk_once(KERN_WARNING "negotiate context goes beyond end\n"); | |
121 | return 0; | |
122 | } | |
123 | ||
124 | cifs_dbg(FYI, "length of negcontexts %d pad %d\n", | |
125 | len - nc_offset, size_of_pad_before_neg_ctxts); | |
126 | ||
127 | /* length of negcontexts including pad from end of sec blob to them */ | |
128 | return (len - nc_offset) + size_of_pad_before_neg_ctxts; | |
129 | } | |
130 | #endif /* CIFS_SMB311 */ | |
131 | ||
093b2bda | 132 | int |
98170fb5 | 133 | smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *srvr) |
093b2bda | 134 | { |
1fc6ad2f | 135 | struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf; |
98170fb5 | 136 | struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)shdr; |
373512ec | 137 | __u64 mid; |
093b2bda PS |
138 | __u32 clc_len; /* calculated length */ |
139 | int command; | |
98170fb5 RS |
140 | int pdu_size = sizeof(struct smb2_sync_pdu); |
141 | int hdr_size = sizeof(struct smb2_sync_hdr); | |
093b2bda PS |
142 | |
143 | /* | |
144 | * Add function to do table lookup of StructureSize by command | |
145 | * ie Validate the wct via smb2_struct_sizes table above | |
146 | */ | |
31473fc4 | 147 | if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) { |
373512ec SF |
148 | struct smb2_transform_hdr *thdr = |
149 | (struct smb2_transform_hdr *)buf; | |
150 | struct cifs_ses *ses = NULL; | |
151 | struct list_head *tmp; | |
152 | ||
153 | /* decrypt frame now that it is completely read in */ | |
154 | spin_lock(&cifs_tcp_ses_lock); | |
155 | list_for_each(tmp, &srvr->smb_ses_list) { | |
156 | ses = list_entry(tmp, struct cifs_ses, smb_ses_list); | |
157 | if (ses->Suid == thdr->SessionId) | |
158 | break; | |
159 | ||
160 | ses = NULL; | |
161 | } | |
162 | spin_unlock(&cifs_tcp_ses_lock); | |
163 | if (ses == NULL) { | |
164 | cifs_dbg(VFS, "no decryption - session id not found\n"); | |
165 | return 1; | |
166 | } | |
167 | } | |
168 | ||
31473fc4 | 169 | mid = le64_to_cpu(shdr->MessageId); |
98170fb5 RS |
170 | if (len < pdu_size) { |
171 | if ((len >= hdr_size) | |
31473fc4 | 172 | && (shdr->Status != 0)) { |
093b2bda PS |
173 | pdu->StructureSize2 = 0; |
174 | /* | |
175 | * As with SMB/CIFS, on some error cases servers may | |
176 | * not return wct properly | |
177 | */ | |
178 | return 0; | |
179 | } else { | |
f96637be | 180 | cifs_dbg(VFS, "Length less than SMB header size\n"); |
093b2bda PS |
181 | } |
182 | return 1; | |
183 | } | |
1fc6ad2f | 184 | if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE) { |
f96637be JP |
185 | cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n", |
186 | mid); | |
093b2bda PS |
187 | return 1; |
188 | } | |
189 | ||
31473fc4 | 190 | if (check_smb2_hdr(shdr, mid)) |
093b2bda PS |
191 | return 1; |
192 | ||
31473fc4 | 193 | if (shdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) { |
f96637be | 194 | cifs_dbg(VFS, "Illegal structure size %u\n", |
31473fc4 | 195 | le16_to_cpu(shdr->StructureSize)); |
093b2bda PS |
196 | return 1; |
197 | } | |
198 | ||
31473fc4 | 199 | command = le16_to_cpu(shdr->Command); |
093b2bda | 200 | if (command >= NUMBER_OF_SMB2_COMMANDS) { |
f96637be | 201 | cifs_dbg(VFS, "Illegal SMB2 command %d\n", command); |
093b2bda PS |
202 | return 1; |
203 | } | |
204 | ||
205 | if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) { | |
31473fc4 | 206 | if (command != SMB2_OPLOCK_BREAK_HE && (shdr->Status == 0 || |
983c88a4 | 207 | pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) { |
093b2bda | 208 | /* error packets have 9 byte structure size */ |
f96637be JP |
209 | cifs_dbg(VFS, "Illegal response size %u for command %d\n", |
210 | le16_to_cpu(pdu->StructureSize2), command); | |
093b2bda | 211 | return 1; |
31473fc4 PS |
212 | } else if (command == SMB2_OPLOCK_BREAK_HE |
213 | && (shdr->Status == 0) | |
0822f514 PS |
214 | && (le16_to_cpu(pdu->StructureSize2) != 44) |
215 | && (le16_to_cpu(pdu->StructureSize2) != 36)) { | |
216 | /* special case for SMB2.1 lease break message */ | |
f96637be JP |
217 | cifs_dbg(VFS, "Illegal response size %d for oplock break\n", |
218 | le16_to_cpu(pdu->StructureSize2)); | |
0822f514 | 219 | return 1; |
093b2bda PS |
220 | } |
221 | } | |
222 | ||
98170fb5 | 223 | clc_len = smb2_calc_size(buf, srvr); |
093b2bda | 224 | |
136ff1b4 SF |
225 | #ifdef CONFIG_CIFS_SMB311 |
226 | if (shdr->Command == SMB2_NEGOTIATE) | |
1fc6ad2f | 227 | clc_len += get_neg_ctxt_len(shdr, len, clc_len); |
136ff1b4 | 228 | #endif /* SMB311 */ |
98170fb5 RS |
229 | if (len != clc_len) { |
230 | cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n", | |
231 | clc_len, len, mid); | |
b42bf888 PS |
232 | /* create failed on symlink */ |
233 | if (command == SMB2_CREATE_HE && | |
31473fc4 | 234 | shdr->Status == STATUS_STOPPED_ON_SYMLINK) |
b42bf888 | 235 | return 0; |
983c88a4 | 236 | /* Windows 7 server returns 24 bytes more */ |
98170fb5 | 237 | if (clc_len + 24 == len && command == SMB2_OPLOCK_BREAK_HE) |
983c88a4 | 238 | return 0; |
754789a1 | 239 | /* server can return one byte more due to implied bcc[0] */ |
98170fb5 | 240 | if (clc_len == len + 1) |
74112860 | 241 | return 0; |
754789a1 SF |
242 | |
243 | /* | |
244 | * MacOS server pads after SMB2.1 write response with 3 bytes | |
245 | * of junk. Other servers match RFC1001 len to actual | |
246 | * SMB2/SMB3 frame length (header + smb2 response specific data) | |
8ce79ec3 | 247 | * Some windows servers do too when compounding is used. |
754789a1 SF |
248 | * Log the server error (once), but allow it and continue |
249 | * since the frame is parseable. | |
250 | */ | |
98170fb5 | 251 | if (clc_len < len) { |
754789a1 | 252 | printk_once(KERN_WARNING |
1fc6ad2f | 253 | "SMB2 server sent bad RFC1001 len %d not %d\n", |
98170fb5 | 254 | len, clc_len); |
754789a1 SF |
255 | return 0; |
256 | } | |
257 | ||
093b2bda PS |
258 | return 1; |
259 | } | |
260 | return 0; | |
261 | } | |
262 | ||
263 | /* | |
264 | * The size of the variable area depends on the offset and length fields | |
265 | * located in different fields for various SMB2 responses. SMB2 responses | |
266 | * with no variable length info, show an offset of zero for the offset field. | |
267 | */ | |
268 | static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = { | |
269 | /* SMB2_NEGOTIATE */ true, | |
270 | /* SMB2_SESSION_SETUP */ true, | |
271 | /* SMB2_LOGOFF */ false, | |
272 | /* SMB2_TREE_CONNECT */ false, | |
273 | /* SMB2_TREE_DISCONNECT */ false, | |
274 | /* SMB2_CREATE */ true, | |
275 | /* SMB2_CLOSE */ false, | |
276 | /* SMB2_FLUSH */ false, | |
277 | /* SMB2_READ */ true, | |
278 | /* SMB2_WRITE */ false, | |
279 | /* SMB2_LOCK */ false, | |
280 | /* SMB2_IOCTL */ true, | |
281 | /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */ | |
282 | /* SMB2_ECHO */ false, | |
283 | /* SMB2_QUERY_DIRECTORY */ true, | |
284 | /* SMB2_CHANGE_NOTIFY */ true, | |
285 | /* SMB2_QUERY_INFO */ true, | |
286 | /* SMB2_SET_INFO */ false, | |
287 | /* SMB2_OPLOCK_BREAK */ false | |
288 | }; | |
289 | ||
290 | /* | |
291 | * Returns the pointer to the beginning of the data area. Length of the data | |
292 | * area and the offset to it (from the beginning of the smb are also returned. | |
293 | */ | |
ec2e4523 | 294 | char * |
e4dc31fe | 295 | smb2_get_data_area_len(int *off, int *len, struct smb2_sync_hdr *shdr) |
093b2bda PS |
296 | { |
297 | *off = 0; | |
298 | *len = 0; | |
299 | ||
300 | /* error responses do not have data area */ | |
31473fc4 | 301 | if (shdr->Status && shdr->Status != STATUS_MORE_PROCESSING_REQUIRED && |
e4dc31fe | 302 | (((struct smb2_err_rsp *)shdr)->StructureSize) == |
093b2bda PS |
303 | SMB2_ERROR_STRUCTURE_SIZE2) |
304 | return NULL; | |
305 | ||
306 | /* | |
307 | * Following commands have data areas so we have to get the location | |
308 | * of the data buffer offset and data buffer length for the particular | |
309 | * command. | |
310 | */ | |
31473fc4 | 311 | switch (shdr->Command) { |
093b2bda | 312 | case SMB2_NEGOTIATE: |
ec2e4523 | 313 | *off = le16_to_cpu( |
e4dc31fe | 314 | ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferOffset); |
ec2e4523 | 315 | *len = le16_to_cpu( |
e4dc31fe | 316 | ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferLength); |
ec2e4523 | 317 | break; |
093b2bda | 318 | case SMB2_SESSION_SETUP: |
5478f9ba | 319 | *off = le16_to_cpu( |
e4dc31fe | 320 | ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferOffset); |
5478f9ba | 321 | *len = le16_to_cpu( |
e4dc31fe | 322 | ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferLength); |
5478f9ba | 323 | break; |
093b2bda | 324 | case SMB2_CREATE: |
2503a0db | 325 | *off = le32_to_cpu( |
e4dc31fe | 326 | ((struct smb2_create_rsp *)shdr)->CreateContextsOffset); |
2503a0db | 327 | *len = le32_to_cpu( |
e4dc31fe | 328 | ((struct smb2_create_rsp *)shdr)->CreateContextsLength); |
2503a0db | 329 | break; |
093b2bda | 330 | case SMB2_QUERY_INFO: |
be4cb9e3 | 331 | *off = le16_to_cpu( |
e4dc31fe | 332 | ((struct smb2_query_info_rsp *)shdr)->OutputBufferOffset); |
be4cb9e3 | 333 | *len = le32_to_cpu( |
e4dc31fe | 334 | ((struct smb2_query_info_rsp *)shdr)->OutputBufferLength); |
be4cb9e3 PS |
335 | break; |
336 | case SMB2_READ: | |
e4dc31fe RS |
337 | /* TODO: is this a bug ? */ |
338 | *off = ((struct smb2_read_rsp *)shdr)->DataOffset; | |
339 | *len = le32_to_cpu(((struct smb2_read_rsp *)shdr)->DataLength); | |
09a4707e | 340 | break; |
093b2bda | 341 | case SMB2_QUERY_DIRECTORY: |
d324f08d | 342 | *off = le16_to_cpu( |
e4dc31fe | 343 | ((struct smb2_query_directory_rsp *)shdr)->OutputBufferOffset); |
d324f08d | 344 | *len = le32_to_cpu( |
e4dc31fe | 345 | ((struct smb2_query_directory_rsp *)shdr)->OutputBufferLength); |
d324f08d | 346 | break; |
093b2bda | 347 | case SMB2_IOCTL: |
4a72dafa | 348 | *off = le32_to_cpu( |
e4dc31fe RS |
349 | ((struct smb2_ioctl_rsp *)shdr)->OutputOffset); |
350 | *len = le32_to_cpu( | |
351 | ((struct smb2_ioctl_rsp *)shdr)->OutputCount); | |
4a72dafa | 352 | break; |
093b2bda PS |
353 | case SMB2_CHANGE_NOTIFY: |
354 | default: | |
355 | /* BB FIXME for unimplemented cases above */ | |
f96637be | 356 | cifs_dbg(VFS, "no length check for command\n"); |
093b2bda PS |
357 | break; |
358 | } | |
359 | ||
360 | /* | |
361 | * Invalid length or offset probably means data area is invalid, but | |
362 | * we have little choice but to ignore the data area in this case. | |
363 | */ | |
364 | if (*off > 4096) { | |
f96637be | 365 | cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off); |
093b2bda PS |
366 | *len = 0; |
367 | *off = 0; | |
368 | } else if (*off < 0) { | |
f96637be JP |
369 | cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n", |
370 | *off); | |
093b2bda PS |
371 | *off = 0; |
372 | *len = 0; | |
373 | } else if (*len < 0) { | |
f96637be JP |
374 | cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n", |
375 | *len); | |
093b2bda PS |
376 | *len = 0; |
377 | } else if (*len > 128 * 1024) { | |
f96637be | 378 | cifs_dbg(VFS, "data area larger than 128K: %d\n", *len); |
093b2bda PS |
379 | *len = 0; |
380 | } | |
381 | ||
382 | /* return pointer to beginning of data area, ie offset from SMB start */ | |
383 | if ((*off != 0) && (*len != 0)) | |
31473fc4 | 384 | return (char *)shdr + *off; |
093b2bda PS |
385 | else |
386 | return NULL; | |
387 | } | |
388 | ||
389 | /* | |
390 | * Calculate the size of the SMB message based on the fixed header | |
391 | * portion, the number of word parameters and the data portion of the message. | |
392 | */ | |
393 | unsigned int | |
9ec672bd | 394 | smb2_calc_size(void *buf, struct TCP_Server_Info *srvr) |
093b2bda | 395 | { |
84f0cbfb RS |
396 | struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)buf; |
397 | struct smb2_sync_hdr *shdr = &pdu->sync_hdr; | |
093b2bda PS |
398 | int offset; /* the offset from the beginning of SMB to data area */ |
399 | int data_length; /* the length of the variable length data area */ | |
400 | /* Structure Size has already been checked to make sure it is 64 */ | |
1fc6ad2f | 401 | int len = le16_to_cpu(shdr->StructureSize); |
093b2bda PS |
402 | |
403 | /* | |
404 | * StructureSize2, ie length of fixed parameter area has already | |
405 | * been checked to make sure it is the correct length. | |
406 | */ | |
407 | len += le16_to_cpu(pdu->StructureSize2); | |
408 | ||
31473fc4 | 409 | if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false) |
093b2bda PS |
410 | goto calc_size_exit; |
411 | ||
e4dc31fe | 412 | smb2_get_data_area_len(&offset, &data_length, shdr); |
f96637be | 413 | cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset); |
093b2bda PS |
414 | |
415 | if (data_length > 0) { | |
416 | /* | |
417 | * Check to make sure that data area begins after fixed area, | |
418 | * Note that last byte of the fixed area is part of data area | |
419 | * for some commands, typically those with odd StructureSize, | |
84f0cbfb | 420 | * so we must add one to the calculation. |
093b2bda | 421 | */ |
1fc6ad2f RS |
422 | if (offset + 1 < len) { |
423 | cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n", | |
424 | offset + 1, len); | |
093b2bda PS |
425 | data_length = 0; |
426 | } else { | |
1fc6ad2f | 427 | len = offset + data_length; |
093b2bda PS |
428 | } |
429 | } | |
430 | calc_size_exit: | |
f96637be | 431 | cifs_dbg(FYI, "SMB2 len %d\n", len); |
093b2bda PS |
432 | return len; |
433 | } | |
2503a0db PS |
434 | |
435 | /* Note: caller must free return buffer */ | |
436 | __le16 * | |
437 | cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb) | |
438 | { | |
439 | int len; | |
440 | const char *start_of_path; | |
441 | __le16 *to; | |
a4153cb1 SF |
442 | int map_type; |
443 | ||
444 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR) | |
445 | map_type = SFM_MAP_UNI_RSVD; | |
446 | else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR) | |
447 | map_type = SFU_MAP_UNI_RSVD; | |
448 | else | |
449 | map_type = NO_MAP_UNI_RSVD; | |
2503a0db PS |
450 | |
451 | /* Windows doesn't allow paths beginning with \ */ | |
452 | if (from[0] == '\\') | |
453 | start_of_path = from + 1; | |
ce558b0e SF |
454 | #ifdef CONFIG_CIFS_SMB311 |
455 | /* SMB311 POSIX extensions paths do not include leading slash */ | |
8ddecf5f AA |
456 | else if (cifs_sb_master_tlink(cifs_sb) && |
457 | cifs_sb_master_tcon(cifs_sb)->posix_extensions) { | |
ce558b0e | 458 | start_of_path = from + 1; |
8ddecf5f | 459 | } |
ce558b0e | 460 | #endif /* 311 */ |
2503a0db PS |
461 | else |
462 | start_of_path = from; | |
ce558b0e | 463 | |
2503a0db | 464 | to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len, |
a4153cb1 | 465 | cifs_sb->local_nls, map_type); |
2503a0db PS |
466 | return to; |
467 | } | |
983c88a4 | 468 | |
0822f514 PS |
469 | __le32 |
470 | smb2_get_lease_state(struct cifsInodeInfo *cinode) | |
471 | { | |
53ef1016 | 472 | __le32 lease = 0; |
0822f514 | 473 | |
53ef1016 PS |
474 | if (CIFS_CACHE_WRITE(cinode)) |
475 | lease |= SMB2_LEASE_WRITE_CACHING; | |
476 | if (CIFS_CACHE_HANDLE(cinode)) | |
477 | lease |= SMB2_LEASE_HANDLE_CACHING; | |
478 | if (CIFS_CACHE_READ(cinode)) | |
479 | lease |= SMB2_LEASE_READ_CACHING; | |
480 | return lease; | |
0822f514 PS |
481 | } |
482 | ||
233839b1 PS |
483 | struct smb2_lease_break_work { |
484 | struct work_struct lease_break; | |
485 | struct tcon_link *tlink; | |
486 | __u8 lease_key[16]; | |
487 | __le32 lease_state; | |
488 | }; | |
489 | ||
490 | static void | |
491 | cifs_ses_oplock_break(struct work_struct *work) | |
492 | { | |
493 | struct smb2_lease_break_work *lw = container_of(work, | |
494 | struct smb2_lease_break_work, lease_break); | |
a93864d9 | 495 | int rc = 0; |
233839b1 PS |
496 | |
497 | rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key, | |
498 | lw->lease_state); | |
a93864d9 | 499 | |
f96637be | 500 | cifs_dbg(FYI, "Lease release rc %d\n", rc); |
233839b1 PS |
501 | cifs_put_tlink(lw->tlink); |
502 | kfree(lw); | |
503 | } | |
504 | ||
0822f514 | 505 | static bool |
933d4b36 PS |
506 | smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp, |
507 | struct smb2_lease_break_work *lw) | |
508 | { | |
509 | bool found; | |
510 | __u8 lease_state; | |
511 | struct list_head *tmp; | |
512 | struct cifsFileInfo *cfile; | |
42873b0a | 513 | struct TCP_Server_Info *server = tcon->ses->server; |
933d4b36 PS |
514 | struct cifs_pending_open *open; |
515 | struct cifsInodeInfo *cinode; | |
516 | int ack_req = le32_to_cpu(rsp->Flags & | |
517 | SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED); | |
518 | ||
53ef1016 | 519 | lease_state = le32_to_cpu(rsp->NewLeaseState); |
933d4b36 PS |
520 | |
521 | list_for_each(tmp, &tcon->openFileList) { | |
522 | cfile = list_entry(tmp, struct cifsFileInfo, tlist); | |
2b0143b5 | 523 | cinode = CIFS_I(d_inode(cfile->dentry)); |
933d4b36 PS |
524 | |
525 | if (memcmp(cinode->lease_key, rsp->LeaseKey, | |
526 | SMB2_LEASE_KEY_SIZE)) | |
527 | continue; | |
528 | ||
529 | cifs_dbg(FYI, "found in the open list\n"); | |
59b04c5d | 530 | cifs_dbg(FYI, "lease key match, lease break 0x%x\n", |
933d4b36 PS |
531 | le32_to_cpu(rsp->NewLeaseState)); |
532 | ||
42873b0a | 533 | server->ops->set_oplock_level(cinode, lease_state, 0, NULL); |
933d4b36 PS |
534 | |
535 | if (ack_req) | |
536 | cfile->oplock_break_cancelled = false; | |
537 | else | |
538 | cfile->oplock_break_cancelled = true; | |
539 | ||
3998e6b8 | 540 | queue_work(cifsoplockd_wq, &cfile->oplock_break); |
933d4b36 PS |
541 | kfree(lw); |
542 | return true; | |
543 | } | |
544 | ||
545 | found = false; | |
546 | list_for_each_entry(open, &tcon->pending_opens, olist) { | |
547 | if (memcmp(open->lease_key, rsp->LeaseKey, | |
548 | SMB2_LEASE_KEY_SIZE)) | |
549 | continue; | |
550 | ||
551 | if (!found && ack_req) { | |
552 | found = true; | |
553 | memcpy(lw->lease_key, open->lease_key, | |
554 | SMB2_LEASE_KEY_SIZE); | |
555 | lw->tlink = cifs_get_tlink(open->tlink); | |
556 | queue_work(cifsiod_wq, &lw->lease_break); | |
557 | } | |
558 | ||
559 | cifs_dbg(FYI, "found in the pending open list\n"); | |
59b04c5d | 560 | cifs_dbg(FYI, "lease key match, lease break 0x%x\n", |
933d4b36 PS |
561 | le32_to_cpu(rsp->NewLeaseState)); |
562 | ||
563 | open->oplock = lease_state; | |
564 | } | |
a93864d9 | 565 | |
933d4b36 PS |
566 | return found; |
567 | } | |
568 | ||
569 | static bool | |
570 | smb2_is_valid_lease_break(char *buffer) | |
0822f514 PS |
571 | { |
572 | struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer; | |
573 | struct list_head *tmp, *tmp1, *tmp2; | |
933d4b36 | 574 | struct TCP_Server_Info *server; |
0822f514 PS |
575 | struct cifs_ses *ses; |
576 | struct cifs_tcon *tcon; | |
233839b1 | 577 | struct smb2_lease_break_work *lw; |
233839b1 PS |
578 | |
579 | lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL); | |
f96637be | 580 | if (!lw) |
233839b1 | 581 | return false; |
233839b1 PS |
582 | |
583 | INIT_WORK(&lw->lease_break, cifs_ses_oplock_break); | |
584 | lw->lease_state = rsp->NewLeaseState; | |
0822f514 | 585 | |
f96637be | 586 | cifs_dbg(FYI, "Checking for lease break\n"); |
0822f514 PS |
587 | |
588 | /* look up tcon based on tid & uid */ | |
589 | spin_lock(&cifs_tcp_ses_lock); | |
933d4b36 PS |
590 | list_for_each(tmp, &cifs_tcp_ses_list) { |
591 | server = list_entry(tmp, struct TCP_Server_Info, tcp_ses_list); | |
0822f514 | 592 | |
933d4b36 PS |
593 | list_for_each(tmp1, &server->smb_ses_list) { |
594 | ses = list_entry(tmp1, struct cifs_ses, smb_ses_list); | |
0822f514 | 595 | |
933d4b36 PS |
596 | list_for_each(tmp2, &ses->tcon_list) { |
597 | tcon = list_entry(tmp2, struct cifs_tcon, | |
598 | tcon_list); | |
3afca265 | 599 | spin_lock(&tcon->open_file_lock); |
933d4b36 PS |
600 | cifs_stats_inc( |
601 | &tcon->stats.cifs_stats.num_oplock_brks); | |
602 | if (smb2_tcon_has_lease(tcon, rsp, lw)) { | |
3afca265 | 603 | spin_unlock(&tcon->open_file_lock); |
933d4b36 PS |
604 | spin_unlock(&cifs_tcp_ses_lock); |
605 | return true; | |
233839b1 | 606 | } |
3afca265 | 607 | spin_unlock(&tcon->open_file_lock); |
a93864d9 RS |
608 | |
609 | if (tcon->crfid.is_valid && | |
610 | !memcmp(rsp->LeaseKey, | |
611 | tcon->crfid.fid->lease_key, | |
612 | SMB2_LEASE_KEY_SIZE)) { | |
613 | INIT_WORK(&tcon->crfid.lease_break, | |
614 | smb2_cached_lease_break); | |
615 | queue_work(cifsiod_wq, | |
616 | &tcon->crfid.lease_break); | |
617 | spin_unlock(&cifs_tcp_ses_lock); | |
618 | return true; | |
619 | } | |
233839b1 | 620 | } |
0822f514 PS |
621 | } |
622 | } | |
623 | spin_unlock(&cifs_tcp_ses_lock); | |
233839b1 | 624 | kfree(lw); |
f96637be | 625 | cifs_dbg(FYI, "Can not process lease break - no lease matched\n"); |
0822f514 PS |
626 | return false; |
627 | } | |
628 | ||
983c88a4 PS |
629 | bool |
630 | smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server) | |
631 | { | |
0d5a288d | 632 | struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer; |
983c88a4 PS |
633 | struct list_head *tmp, *tmp1, *tmp2; |
634 | struct cifs_ses *ses; | |
635 | struct cifs_tcon *tcon; | |
636 | struct cifsInodeInfo *cinode; | |
637 | struct cifsFileInfo *cfile; | |
638 | ||
f96637be | 639 | cifs_dbg(FYI, "Checking for oplock break\n"); |
983c88a4 | 640 | |
0d5a288d | 641 | if (rsp->sync_hdr.Command != SMB2_OPLOCK_BREAK) |
983c88a4 PS |
642 | return false; |
643 | ||
12e8a208 | 644 | if (rsp->StructureSize != |
983c88a4 | 645 | smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) { |
0822f514 | 646 | if (le16_to_cpu(rsp->StructureSize) == 44) |
933d4b36 | 647 | return smb2_is_valid_lease_break(buffer); |
0822f514 PS |
648 | else |
649 | return false; | |
983c88a4 PS |
650 | } |
651 | ||
59b04c5d | 652 | cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel); |
983c88a4 PS |
653 | |
654 | /* look up tcon based on tid & uid */ | |
655 | spin_lock(&cifs_tcp_ses_lock); | |
656 | list_for_each(tmp, &server->smb_ses_list) { | |
657 | ses = list_entry(tmp, struct cifs_ses, smb_ses_list); | |
658 | list_for_each(tmp1, &ses->tcon_list) { | |
659 | tcon = list_entry(tmp1, struct cifs_tcon, tcon_list); | |
660 | ||
661 | cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks); | |
3afca265 | 662 | spin_lock(&tcon->open_file_lock); |
983c88a4 PS |
663 | list_for_each(tmp2, &tcon->openFileList) { |
664 | cfile = list_entry(tmp2, struct cifsFileInfo, | |
665 | tlist); | |
666 | if (rsp->PersistentFid != | |
667 | cfile->fid.persistent_fid || | |
668 | rsp->VolatileFid != | |
669 | cfile->fid.volatile_fid) | |
670 | continue; | |
671 | ||
f96637be | 672 | cifs_dbg(FYI, "file id match, oplock break\n"); |
2b0143b5 | 673 | cinode = CIFS_I(d_inode(cfile->dentry)); |
3afca265 | 674 | spin_lock(&cfile->file_info_lock); |
18cceb6a | 675 | if (!CIFS_CACHE_WRITE(cinode) && |
983c88a4 PS |
676 | rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE) |
677 | cfile->oplock_break_cancelled = true; | |
678 | else | |
679 | cfile->oplock_break_cancelled = false; | |
680 | ||
c11f1df5 SP |
681 | set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, |
682 | &cinode->flags); | |
683 | ||
684 | /* | |
685 | * Set flag if the server downgrades the oplock | |
686 | * to L2 else clear. | |
687 | */ | |
688 | if (rsp->OplockLevel) | |
689 | set_bit( | |
690 | CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, | |
691 | &cinode->flags); | |
692 | else | |
693 | clear_bit( | |
694 | CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, | |
695 | &cinode->flags); | |
3afca265 | 696 | spin_unlock(&cfile->file_info_lock); |
3998e6b8 RV |
697 | queue_work(cifsoplockd_wq, |
698 | &cfile->oplock_break); | |
983c88a4 | 699 | |
3afca265 | 700 | spin_unlock(&tcon->open_file_lock); |
983c88a4 PS |
701 | spin_unlock(&cifs_tcp_ses_lock); |
702 | return true; | |
703 | } | |
3afca265 | 704 | spin_unlock(&tcon->open_file_lock); |
983c88a4 | 705 | spin_unlock(&cifs_tcp_ses_lock); |
f96637be | 706 | cifs_dbg(FYI, "No matching file for oplock break\n"); |
983c88a4 PS |
707 | return true; |
708 | } | |
709 | } | |
710 | spin_unlock(&cifs_tcp_ses_lock); | |
f96637be | 711 | cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n"); |
983c88a4 PS |
712 | return false; |
713 | } | |
38bd4906 SP |
714 | |
715 | void | |
716 | smb2_cancelled_close_fid(struct work_struct *work) | |
717 | { | |
718 | struct close_cancelled_open *cancelled = container_of(work, | |
719 | struct close_cancelled_open, work); | |
720 | ||
721 | cifs_dbg(VFS, "Close unmatched open\n"); | |
722 | ||
723 | SMB2_close(0, cancelled->tcon, cancelled->fid.persistent_fid, | |
724 | cancelled->fid.volatile_fid); | |
725 | cifs_put_tcon(cancelled->tcon); | |
726 | kfree(cancelled); | |
727 | } | |
728 | ||
729 | int | |
730 | smb2_handle_cancelled_mid(char *buffer, struct TCP_Server_Info *server) | |
731 | { | |
49f466bd | 732 | struct smb2_sync_hdr *sync_hdr = (struct smb2_sync_hdr *)buffer; |
38bd4906 SP |
733 | struct smb2_create_rsp *rsp = (struct smb2_create_rsp *)buffer; |
734 | struct cifs_tcon *tcon; | |
735 | struct close_cancelled_open *cancelled; | |
736 | ||
737 | if (sync_hdr->Command != SMB2_CREATE || | |
738 | sync_hdr->Status != STATUS_SUCCESS) | |
739 | return 0; | |
740 | ||
741 | cancelled = kzalloc(sizeof(*cancelled), GFP_KERNEL); | |
742 | if (!cancelled) | |
743 | return -ENOMEM; | |
744 | ||
745 | tcon = smb2_find_smb_tcon(server, sync_hdr->SessionId, | |
746 | sync_hdr->TreeId); | |
747 | if (!tcon) { | |
748 | kfree(cancelled); | |
749 | return -ENOENT; | |
750 | } | |
751 | ||
752 | cancelled->fid.persistent_fid = rsp->PersistentFileId; | |
753 | cancelled->fid.volatile_fid = rsp->VolatileFileId; | |
754 | cancelled->tcon = tcon; | |
755 | INIT_WORK(&cancelled->work, smb2_cancelled_close_fid); | |
756 | queue_work(cifsiod_wq, &cancelled->work); | |
757 | ||
758 | return 0; | |
759 | } | |
8bd68c6e AA |
760 | |
761 | #ifdef CONFIG_CIFS_SMB311 | |
762 | /** | |
763 | * smb311_update_preauth_hash - update @ses hash with the packet data in @iov | |
764 | * | |
765 | * Assumes @iov does not contain the rfc1002 length and iov[0] has the | |
766 | * SMB2 header. | |
767 | */ | |
768 | int | |
769 | smb311_update_preauth_hash(struct cifs_ses *ses, struct kvec *iov, int nvec) | |
770 | { | |
771 | int i, rc; | |
772 | struct sdesc *d; | |
773 | struct smb2_sync_hdr *hdr; | |
774 | ||
775 | if (ses->server->tcpStatus == CifsGood) { | |
776 | /* skip non smb311 connections */ | |
777 | if (ses->server->dialect != SMB311_PROT_ID) | |
778 | return 0; | |
779 | ||
780 | /* skip last sess setup response */ | |
781 | hdr = (struct smb2_sync_hdr *)iov[0].iov_base; | |
782 | if (hdr->Flags & SMB2_FLAGS_SIGNED) | |
783 | return 0; | |
784 | } | |
785 | ||
786 | rc = smb311_crypto_shash_allocate(ses->server); | |
787 | if (rc) | |
788 | return rc; | |
789 | ||
790 | d = ses->server->secmech.sdescsha512; | |
791 | rc = crypto_shash_init(&d->shash); | |
792 | if (rc) { | |
793 | cifs_dbg(VFS, "%s: could not init sha512 shash\n", __func__); | |
794 | return rc; | |
795 | } | |
796 | ||
797 | rc = crypto_shash_update(&d->shash, ses->preauth_sha_hash, | |
798 | SMB2_PREAUTH_HASH_SIZE); | |
799 | if (rc) { | |
800 | cifs_dbg(VFS, "%s: could not update sha512 shash\n", __func__); | |
801 | return rc; | |
802 | } | |
803 | ||
804 | for (i = 0; i < nvec; i++) { | |
805 | rc = crypto_shash_update(&d->shash, | |
806 | iov[i].iov_base, iov[i].iov_len); | |
807 | if (rc) { | |
808 | cifs_dbg(VFS, "%s: could not update sha512 shash\n", | |
809 | __func__); | |
810 | return rc; | |
811 | } | |
812 | } | |
813 | ||
814 | rc = crypto_shash_final(&d->shash, ses->preauth_sha_hash); | |
815 | if (rc) { | |
816 | cifs_dbg(VFS, "%s: could not finalize sha512 shash\n", | |
817 | __func__); | |
818 | return rc; | |
819 | } | |
820 | ||
821 | return 0; | |
822 | } | |
823 | #endif |