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Commit | Line | Data |
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2dc7e1c0 PS |
1 | /* |
2 | * fs/cifs/smb2transport.c | |
3 | * | |
4 | * Copyright (C) International Business Machines Corp., 2002, 2011 | |
5 | * Etersoft, 2012 | |
6 | * Author(s): Steve French (sfrench@us.ibm.com) | |
7 | * Jeremy Allison (jra@samba.org) 2006 | |
8 | * Pavel Shilovsky (pshilovsky@samba.org) 2012 | |
9 | * | |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | ||
25 | #include <linux/fs.h> | |
26 | #include <linux/list.h> | |
27 | #include <linux/wait.h> | |
28 | #include <linux/net.h> | |
29 | #include <linux/delay.h> | |
30 | #include <linux/uaccess.h> | |
31 | #include <asm/processor.h> | |
32 | #include <linux/mempool.h> | |
fb308a6f | 33 | #include <linux/highmem.h> |
026e93dc | 34 | #include <crypto/aead.h> |
2dc7e1c0 PS |
35 | #include "smb2pdu.h" |
36 | #include "cifsglob.h" | |
37 | #include "cifsproto.h" | |
38 | #include "smb2proto.h" | |
39 | #include "cifs_debug.h" | |
40 | #include "smb2status.h" | |
3c1bf7e4 PS |
41 | #include "smb2glob.h" |
42 | ||
95dc8dd1 SF |
43 | static int |
44 | smb2_crypto_shash_allocate(struct TCP_Server_Info *server) | |
45 | { | |
ba482029 | 46 | int rc; |
95dc8dd1 SF |
47 | unsigned int size; |
48 | ||
49 | if (server->secmech.sdeschmacsha256 != NULL) | |
50 | return 0; /* already allocated */ | |
51 | ||
52 | server->secmech.hmacsha256 = crypto_alloc_shash("hmac(sha256)", 0, 0); | |
53 | if (IS_ERR(server->secmech.hmacsha256)) { | |
54 | cifs_dbg(VFS, "could not allocate crypto hmacsha256\n"); | |
ba482029 JL |
55 | rc = PTR_ERR(server->secmech.hmacsha256); |
56 | server->secmech.hmacsha256 = NULL; | |
57 | return rc; | |
95dc8dd1 SF |
58 | } |
59 | ||
60 | size = sizeof(struct shash_desc) + | |
61 | crypto_shash_descsize(server->secmech.hmacsha256); | |
62 | server->secmech.sdeschmacsha256 = kmalloc(size, GFP_KERNEL); | |
63 | if (!server->secmech.sdeschmacsha256) { | |
64 | crypto_free_shash(server->secmech.hmacsha256); | |
65 | server->secmech.hmacsha256 = NULL; | |
66 | return -ENOMEM; | |
67 | } | |
68 | server->secmech.sdeschmacsha256->shash.tfm = server->secmech.hmacsha256; | |
69 | server->secmech.sdeschmacsha256->shash.flags = 0x0; | |
70 | ||
71 | return 0; | |
72 | } | |
73 | ||
74 | static int | |
75 | smb3_crypto_shash_allocate(struct TCP_Server_Info *server) | |
76 | { | |
77 | unsigned int size; | |
78 | int rc; | |
79 | ||
80 | if (server->secmech.sdesccmacaes != NULL) | |
81 | return 0; /* already allocated */ | |
82 | ||
83 | rc = smb2_crypto_shash_allocate(server); | |
84 | if (rc) | |
85 | return rc; | |
86 | ||
87 | server->secmech.cmacaes = crypto_alloc_shash("cmac(aes)", 0, 0); | |
88 | if (IS_ERR(server->secmech.cmacaes)) { | |
89 | cifs_dbg(VFS, "could not allocate crypto cmac-aes"); | |
90 | kfree(server->secmech.sdeschmacsha256); | |
91 | server->secmech.sdeschmacsha256 = NULL; | |
92 | crypto_free_shash(server->secmech.hmacsha256); | |
93 | server->secmech.hmacsha256 = NULL; | |
ba482029 JL |
94 | rc = PTR_ERR(server->secmech.cmacaes); |
95 | server->secmech.cmacaes = NULL; | |
96 | return rc; | |
95dc8dd1 SF |
97 | } |
98 | ||
99 | size = sizeof(struct shash_desc) + | |
100 | crypto_shash_descsize(server->secmech.cmacaes); | |
101 | server->secmech.sdesccmacaes = kmalloc(size, GFP_KERNEL); | |
102 | if (!server->secmech.sdesccmacaes) { | |
103 | cifs_dbg(VFS, "%s: Can't alloc cmacaes\n", __func__); | |
104 | kfree(server->secmech.sdeschmacsha256); | |
105 | server->secmech.sdeschmacsha256 = NULL; | |
106 | crypto_free_shash(server->secmech.hmacsha256); | |
107 | crypto_free_shash(server->secmech.cmacaes); | |
108 | server->secmech.hmacsha256 = NULL; | |
109 | server->secmech.cmacaes = NULL; | |
110 | return -ENOMEM; | |
111 | } | |
112 | server->secmech.sdesccmacaes->shash.tfm = server->secmech.cmacaes; | |
113 | server->secmech.sdesccmacaes->shash.flags = 0x0; | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
026e93dc PS |
118 | struct cifs_ses * |
119 | smb2_find_smb_ses(struct TCP_Server_Info *server, __u64 ses_id) | |
32811d24 SP |
120 | { |
121 | struct cifs_ses *ses; | |
122 | ||
123 | spin_lock(&cifs_tcp_ses_lock); | |
124 | list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) { | |
026e93dc | 125 | if (ses->Suid != ses_id) |
32811d24 SP |
126 | continue; |
127 | spin_unlock(&cifs_tcp_ses_lock); | |
128 | return ses; | |
129 | } | |
130 | spin_unlock(&cifs_tcp_ses_lock); | |
131 | ||
132 | return NULL; | |
133 | } | |
134 | ||
38107d45 | 135 | int |
0b688cfc | 136 | smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server) |
3c1bf7e4 | 137 | { |
16c568ef | 138 | int rc; |
3c1bf7e4 PS |
139 | unsigned char smb2_signature[SMB2_HMACSHA256_SIZE]; |
140 | unsigned char *sigptr = smb2_signature; | |
0b688cfc | 141 | struct kvec *iov = rqst->rq_iov; |
738f9de5 | 142 | struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[1].iov_base; |
32811d24 SP |
143 | struct cifs_ses *ses; |
144 | ||
026e93dc | 145 | ses = smb2_find_smb_ses(server, shdr->SessionId); |
32811d24 SP |
146 | if (!ses) { |
147 | cifs_dbg(VFS, "%s: Could not find session\n", __func__); | |
148 | return 0; | |
149 | } | |
3c1bf7e4 PS |
150 | |
151 | memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE); | |
31473fc4 | 152 | memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE); |
3c1bf7e4 | 153 | |
95dc8dd1 SF |
154 | rc = smb2_crypto_shash_allocate(server); |
155 | if (rc) { | |
156 | cifs_dbg(VFS, "%s: shah256 alloc failed\n", __func__); | |
157 | return rc; | |
158 | } | |
159 | ||
3c1bf7e4 | 160 | rc = crypto_shash_setkey(server->secmech.hmacsha256, |
32811d24 | 161 | ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE); |
3c1bf7e4 | 162 | if (rc) { |
f96637be | 163 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
3c1bf7e4 PS |
164 | return rc; |
165 | } | |
166 | ||
167 | rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash); | |
168 | if (rc) { | |
95dc8dd1 | 169 | cifs_dbg(VFS, "%s: Could not init sha256", __func__); |
3c1bf7e4 PS |
170 | return rc; |
171 | } | |
172 | ||
16c568ef AV |
173 | rc = __cifs_calc_signature(rqst, server, sigptr, |
174 | &server->secmech.sdeschmacsha256->shash); | |
3c1bf7e4 | 175 | |
16c568ef | 176 | if (!rc) |
31473fc4 | 177 | memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE); |
3c1bf7e4 PS |
178 | |
179 | return rc; | |
180 | } | |
181 | ||
373512ec SF |
182 | static int generate_key(struct cifs_ses *ses, struct kvec label, |
183 | struct kvec context, __u8 *key, unsigned int key_size) | |
429b46f4 SF |
184 | { |
185 | unsigned char zero = 0x0; | |
186 | __u8 i[4] = {0, 0, 0, 1}; | |
187 | __u8 L[4] = {0, 0, 0, 128}; | |
188 | int rc = 0; | |
189 | unsigned char prfhash[SMB2_HMACSHA256_SIZE]; | |
190 | unsigned char *hashptr = prfhash; | |
191 | ||
192 | memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE); | |
373512ec | 193 | memset(key, 0x0, key_size); |
429b46f4 | 194 | |
32811d24 | 195 | rc = smb3_crypto_shash_allocate(ses->server); |
95dc8dd1 SF |
196 | if (rc) { |
197 | cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__); | |
198 | goto smb3signkey_ret; | |
199 | } | |
200 | ||
32811d24 SP |
201 | rc = crypto_shash_setkey(ses->server->secmech.hmacsha256, |
202 | ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE); | |
429b46f4 SF |
203 | if (rc) { |
204 | cifs_dbg(VFS, "%s: Could not set with session key\n", __func__); | |
205 | goto smb3signkey_ret; | |
206 | } | |
207 | ||
32811d24 | 208 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacsha256->shash); |
429b46f4 SF |
209 | if (rc) { |
210 | cifs_dbg(VFS, "%s: Could not init sign hmac\n", __func__); | |
211 | goto smb3signkey_ret; | |
212 | } | |
213 | ||
32811d24 | 214 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
429b46f4 SF |
215 | i, 4); |
216 | if (rc) { | |
217 | cifs_dbg(VFS, "%s: Could not update with n\n", __func__); | |
218 | goto smb3signkey_ret; | |
219 | } | |
220 | ||
32811d24 | 221 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
373512ec | 222 | label.iov_base, label.iov_len); |
429b46f4 SF |
223 | if (rc) { |
224 | cifs_dbg(VFS, "%s: Could not update with label\n", __func__); | |
225 | goto smb3signkey_ret; | |
226 | } | |
227 | ||
32811d24 | 228 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
429b46f4 SF |
229 | &zero, 1); |
230 | if (rc) { | |
231 | cifs_dbg(VFS, "%s: Could not update with zero\n", __func__); | |
232 | goto smb3signkey_ret; | |
233 | } | |
234 | ||
32811d24 | 235 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
373512ec | 236 | context.iov_base, context.iov_len); |
429b46f4 SF |
237 | if (rc) { |
238 | cifs_dbg(VFS, "%s: Could not update with context\n", __func__); | |
239 | goto smb3signkey_ret; | |
240 | } | |
241 | ||
32811d24 | 242 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
429b46f4 SF |
243 | L, 4); |
244 | if (rc) { | |
245 | cifs_dbg(VFS, "%s: Could not update with L\n", __func__); | |
246 | goto smb3signkey_ret; | |
247 | } | |
248 | ||
32811d24 | 249 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacsha256->shash, |
429b46f4 SF |
250 | hashptr); |
251 | if (rc) { | |
252 | cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__); | |
253 | goto smb3signkey_ret; | |
254 | } | |
255 | ||
373512ec | 256 | memcpy(key, hashptr, key_size); |
429b46f4 SF |
257 | |
258 | smb3signkey_ret: | |
32811d24 | 259 | return rc; |
429b46f4 SF |
260 | } |
261 | ||
373512ec SF |
262 | struct derivation { |
263 | struct kvec label; | |
264 | struct kvec context; | |
265 | }; | |
266 | ||
267 | struct derivation_triplet { | |
268 | struct derivation signing; | |
269 | struct derivation encryption; | |
270 | struct derivation decryption; | |
271 | }; | |
272 | ||
273 | static int | |
274 | generate_smb3signingkey(struct cifs_ses *ses, | |
275 | const struct derivation_triplet *ptriplet) | |
276 | { | |
277 | int rc; | |
278 | ||
279 | rc = generate_key(ses, ptriplet->signing.label, | |
280 | ptriplet->signing.context, ses->smb3signingkey, | |
281 | SMB3_SIGN_KEY_SIZE); | |
282 | if (rc) | |
283 | return rc; | |
284 | ||
285 | rc = generate_key(ses, ptriplet->encryption.label, | |
286 | ptriplet->encryption.context, ses->smb3encryptionkey, | |
287 | SMB3_SIGN_KEY_SIZE); | |
288 | if (rc) | |
289 | return rc; | |
290 | ||
291 | return generate_key(ses, ptriplet->decryption.label, | |
292 | ptriplet->decryption.context, | |
293 | ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE); | |
294 | } | |
295 | ||
296 | int | |
297 | generate_smb30signingkey(struct cifs_ses *ses) | |
298 | ||
299 | { | |
300 | struct derivation_triplet triplet; | |
301 | struct derivation *d; | |
302 | ||
303 | d = &triplet.signing; | |
304 | d->label.iov_base = "SMB2AESCMAC"; | |
305 | d->label.iov_len = 12; | |
306 | d->context.iov_base = "SmbSign"; | |
307 | d->context.iov_len = 8; | |
308 | ||
309 | d = &triplet.encryption; | |
310 | d->label.iov_base = "SMB2AESCCM"; | |
311 | d->label.iov_len = 11; | |
312 | d->context.iov_base = "ServerIn "; | |
313 | d->context.iov_len = 10; | |
314 | ||
315 | d = &triplet.decryption; | |
316 | d->label.iov_base = "SMB2AESCCM"; | |
317 | d->label.iov_len = 11; | |
318 | d->context.iov_base = "ServerOut"; | |
319 | d->context.iov_len = 10; | |
320 | ||
321 | return generate_smb3signingkey(ses, &triplet); | |
322 | } | |
323 | ||
324 | int | |
325 | generate_smb311signingkey(struct cifs_ses *ses) | |
326 | ||
327 | { | |
328 | struct derivation_triplet triplet; | |
329 | struct derivation *d; | |
330 | ||
331 | d = &triplet.signing; | |
332 | d->label.iov_base = "SMB2AESCMAC"; | |
333 | d->label.iov_len = 12; | |
334 | d->context.iov_base = "SmbSign"; | |
335 | d->context.iov_len = 8; | |
336 | ||
337 | d = &triplet.encryption; | |
338 | d->label.iov_base = "SMB2AESCCM"; | |
339 | d->label.iov_len = 11; | |
340 | d->context.iov_base = "ServerIn "; | |
341 | d->context.iov_len = 10; | |
342 | ||
343 | d = &triplet.decryption; | |
344 | d->label.iov_base = "SMB2AESCCM"; | |
345 | d->label.iov_len = 11; | |
346 | d->context.iov_base = "ServerOut"; | |
347 | d->context.iov_len = 10; | |
348 | ||
349 | return generate_smb3signingkey(ses, &triplet); | |
350 | } | |
351 | ||
38107d45 SF |
352 | int |
353 | smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server) | |
354 | { | |
32811d24 | 355 | int rc = 0; |
429b46f4 SF |
356 | unsigned char smb3_signature[SMB2_CMACAES_SIZE]; |
357 | unsigned char *sigptr = smb3_signature; | |
358 | struct kvec *iov = rqst->rq_iov; | |
738f9de5 | 359 | struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[1].iov_base; |
32811d24 SP |
360 | struct cifs_ses *ses; |
361 | ||
026e93dc | 362 | ses = smb2_find_smb_ses(server, shdr->SessionId); |
32811d24 SP |
363 | if (!ses) { |
364 | cifs_dbg(VFS, "%s: Could not find session\n", __func__); | |
365 | return 0; | |
366 | } | |
429b46f4 SF |
367 | |
368 | memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE); | |
31473fc4 | 369 | memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE); |
429b46f4 SF |
370 | |
371 | rc = crypto_shash_setkey(server->secmech.cmacaes, | |
32811d24 SP |
372 | ses->smb3signingkey, SMB2_CMACAES_SIZE); |
373 | ||
429b46f4 SF |
374 | if (rc) { |
375 | cifs_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__); | |
376 | return rc; | |
377 | } | |
378 | ||
95dc8dd1 SF |
379 | /* |
380 | * we already allocate sdesccmacaes when we init smb3 signing key, | |
381 | * so unlike smb2 case we do not have to check here if secmech are | |
382 | * initialized | |
383 | */ | |
429b46f4 SF |
384 | rc = crypto_shash_init(&server->secmech.sdesccmacaes->shash); |
385 | if (rc) { | |
386 | cifs_dbg(VFS, "%s: Could not init cmac aes\n", __func__); | |
387 | return rc; | |
388 | } | |
16c568ef AV |
389 | |
390 | rc = __cifs_calc_signature(rqst, server, sigptr, | |
391 | &server->secmech.sdesccmacaes->shash); | |
429b46f4 | 392 | |
16c568ef | 393 | if (!rc) |
31473fc4 | 394 | memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE); |
429b46f4 SF |
395 | |
396 | return rc; | |
38107d45 SF |
397 | } |
398 | ||
3c1bf7e4 PS |
399 | /* must be called with server->srv_mutex held */ |
400 | static int | |
0b688cfc | 401 | smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server) |
3c1bf7e4 PS |
402 | { |
403 | int rc = 0; | |
738f9de5 PS |
404 | struct smb2_sync_hdr *shdr = |
405 | (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base; | |
3c1bf7e4 | 406 | |
31473fc4 | 407 | if (!(shdr->Flags & SMB2_FLAGS_SIGNED) || |
3c1bf7e4 PS |
408 | server->tcpStatus == CifsNeedNegotiate) |
409 | return rc; | |
410 | ||
411 | if (!server->session_estab) { | |
31473fc4 | 412 | strncpy(shdr->Signature, "BSRSPYL", 8); |
3c1bf7e4 PS |
413 | return rc; |
414 | } | |
415 | ||
38107d45 | 416 | rc = server->ops->calc_signature(rqst, server); |
3c1bf7e4 PS |
417 | |
418 | return rc; | |
419 | } | |
420 | ||
421 | int | |
0b688cfc | 422 | smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server) |
3c1bf7e4 PS |
423 | { |
424 | unsigned int rc; | |
425 | char server_response_sig[16]; | |
738f9de5 PS |
426 | struct smb2_sync_hdr *shdr = |
427 | (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base; | |
3c1bf7e4 | 428 | |
31473fc4 PS |
429 | if ((shdr->Command == SMB2_NEGOTIATE) || |
430 | (shdr->Command == SMB2_SESSION_SETUP) || | |
431 | (shdr->Command == SMB2_OPLOCK_BREAK) || | |
3c1bf7e4 PS |
432 | (!server->session_estab)) |
433 | return 0; | |
434 | ||
435 | /* | |
436 | * BB what if signatures are supposed to be on for session but | |
437 | * server does not send one? BB | |
438 | */ | |
439 | ||
440 | /* Do not need to verify session setups with signature "BSRSPYL " */ | |
31473fc4 | 441 | if (memcmp(shdr->Signature, "BSRSPYL ", 8) == 0) |
f96637be | 442 | cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n", |
31473fc4 | 443 | shdr->Command); |
3c1bf7e4 PS |
444 | |
445 | /* | |
446 | * Save off the origiginal signature so we can modify the smb and check | |
447 | * our calculated signature against what the server sent. | |
448 | */ | |
31473fc4 | 449 | memcpy(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE); |
3c1bf7e4 | 450 | |
31473fc4 | 451 | memset(shdr->Signature, 0, SMB2_SIGNATURE_SIZE); |
3c1bf7e4 PS |
452 | |
453 | mutex_lock(&server->srv_mutex); | |
38107d45 | 454 | rc = server->ops->calc_signature(rqst, server); |
3c1bf7e4 PS |
455 | mutex_unlock(&server->srv_mutex); |
456 | ||
457 | if (rc) | |
458 | return rc; | |
459 | ||
31473fc4 | 460 | if (memcmp(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE)) |
3c1bf7e4 PS |
461 | return -EACCES; |
462 | else | |
463 | return 0; | |
464 | } | |
465 | ||
2dc7e1c0 PS |
466 | /* |
467 | * Set message id for the request. Should be called after wait_for_free_request | |
468 | * and when srv_mutex is held. | |
469 | */ | |
470 | static inline void | |
31473fc4 PS |
471 | smb2_seq_num_into_buf(struct TCP_Server_Info *server, |
472 | struct smb2_sync_hdr *shdr) | |
2dc7e1c0 | 473 | { |
31473fc4 | 474 | unsigned int i, num = le16_to_cpu(shdr->CreditCharge); |
cb7e9eab | 475 | |
31473fc4 | 476 | shdr->MessageId = get_next_mid64(server); |
cb7e9eab PS |
477 | /* skip message numbers according to CreditCharge field */ |
478 | for (i = 1; i < num; i++) | |
479 | get_next_mid(server); | |
2dc7e1c0 PS |
480 | } |
481 | ||
482 | static struct mid_q_entry * | |
31473fc4 | 483 | smb2_mid_entry_alloc(const struct smb2_sync_hdr *shdr, |
2dc7e1c0 PS |
484 | struct TCP_Server_Info *server) |
485 | { | |
486 | struct mid_q_entry *temp; | |
487 | ||
488 | if (server == NULL) { | |
f96637be | 489 | cifs_dbg(VFS, "Null TCP session in smb2_mid_entry_alloc\n"); |
2dc7e1c0 PS |
490 | return NULL; |
491 | } | |
492 | ||
493 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); | |
494 | if (temp == NULL) | |
495 | return temp; | |
496 | else { | |
497 | memset(temp, 0, sizeof(struct mid_q_entry)); | |
31473fc4 | 498 | temp->mid = le64_to_cpu(shdr->MessageId); |
2dc7e1c0 | 499 | temp->pid = current->pid; |
31473fc4 | 500 | temp->command = shdr->Command; /* Always LE */ |
2dc7e1c0 PS |
501 | temp->when_alloc = jiffies; |
502 | temp->server = server; | |
503 | ||
504 | /* | |
505 | * The default is for the mid to be synchronous, so the | |
506 | * default callback just wakes up the current task. | |
507 | */ | |
508 | temp->callback = cifs_wake_up_task; | |
509 | temp->callback_data = current; | |
510 | } | |
511 | ||
512 | atomic_inc(&midCount); | |
513 | temp->mid_state = MID_REQUEST_ALLOCATED; | |
514 | return temp; | |
515 | } | |
516 | ||
517 | static int | |
31473fc4 | 518 | smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_sync_hdr *shdr, |
2dc7e1c0 PS |
519 | struct mid_q_entry **mid) |
520 | { | |
521 | if (ses->server->tcpStatus == CifsExiting) | |
522 | return -ENOENT; | |
523 | ||
524 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 525 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
2dc7e1c0 PS |
526 | return -EAGAIN; |
527 | } | |
528 | ||
7f48558e | 529 | if (ses->status == CifsNew) { |
31473fc4 PS |
530 | if ((shdr->Command != SMB2_SESSION_SETUP) && |
531 | (shdr->Command != SMB2_NEGOTIATE)) | |
2dc7e1c0 PS |
532 | return -EAGAIN; |
533 | /* else ok - we are setting up session */ | |
534 | } | |
7f48558e SP |
535 | |
536 | if (ses->status == CifsExiting) { | |
31473fc4 | 537 | if (shdr->Command != SMB2_LOGOFF) |
7f48558e SP |
538 | return -EAGAIN; |
539 | /* else ok - we are shutting down the session */ | |
540 | } | |
541 | ||
31473fc4 | 542 | *mid = smb2_mid_entry_alloc(shdr, ses->server); |
2dc7e1c0 PS |
543 | if (*mid == NULL) |
544 | return -ENOMEM; | |
545 | spin_lock(&GlobalMid_Lock); | |
546 | list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q); | |
547 | spin_unlock(&GlobalMid_Lock); | |
548 | return 0; | |
549 | } | |
550 | ||
551 | int | |
552 | smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
553 | bool log_error) | |
554 | { | |
555 | unsigned int len = get_rfc1002_length(mid->resp_buf); | |
738f9de5 PS |
556 | struct kvec iov[2]; |
557 | struct smb_rqst rqst = { .rq_iov = iov, | |
558 | .rq_nvec = 2 }; | |
0b688cfc | 559 | |
738f9de5 PS |
560 | iov[0].iov_base = (char *)mid->resp_buf; |
561 | iov[0].iov_len = 4; | |
562 | iov[1].iov_base = (char *)mid->resp_buf + 4; | |
563 | iov[1].iov_len = len; | |
2dc7e1c0 PS |
564 | |
565 | dump_smb(mid->resp_buf, min_t(u32, 80, len)); | |
566 | /* convert the length into a more usable form */ | |
4326ed2f | 567 | if (len > 24 && server->sign && !mid->decrypted) { |
3c1bf7e4 PS |
568 | int rc; |
569 | ||
0b688cfc | 570 | rc = smb2_verify_signature(&rqst, server); |
3c1bf7e4 | 571 | if (rc) |
f96637be JP |
572 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
573 | rc); | |
3c1bf7e4 | 574 | } |
2dc7e1c0 PS |
575 | |
576 | return map_smb2_to_linux_error(mid->resp_buf, log_error); | |
577 | } | |
578 | ||
fec344e3 JL |
579 | struct mid_q_entry * |
580 | smb2_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
2dc7e1c0 PS |
581 | { |
582 | int rc; | |
738f9de5 PS |
583 | struct smb2_sync_hdr *shdr = |
584 | (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base; | |
2dc7e1c0 PS |
585 | struct mid_q_entry *mid; |
586 | ||
31473fc4 | 587 | smb2_seq_num_into_buf(ses->server, shdr); |
2dc7e1c0 | 588 | |
31473fc4 | 589 | rc = smb2_get_mid_entry(ses, shdr, &mid); |
2dc7e1c0 | 590 | if (rc) |
fec344e3 JL |
591 | return ERR_PTR(rc); |
592 | rc = smb2_sign_rqst(rqst, ses->server); | |
593 | if (rc) { | |
3c1bf7e4 | 594 | cifs_delete_mid(mid); |
fec344e3 JL |
595 | return ERR_PTR(rc); |
596 | } | |
597 | return mid; | |
2dc7e1c0 PS |
598 | } |
599 | ||
fec344e3 JL |
600 | struct mid_q_entry * |
601 | smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
c95b8eed | 602 | { |
fec344e3 | 603 | int rc; |
738f9de5 PS |
604 | struct smb2_sync_hdr *shdr = |
605 | (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base; | |
c95b8eed PS |
606 | struct mid_q_entry *mid; |
607 | ||
31473fc4 | 608 | smb2_seq_num_into_buf(server, shdr); |
c95b8eed | 609 | |
31473fc4 | 610 | mid = smb2_mid_entry_alloc(shdr, server); |
c95b8eed | 611 | if (mid == NULL) |
fec344e3 | 612 | return ERR_PTR(-ENOMEM); |
c95b8eed | 613 | |
fec344e3 | 614 | rc = smb2_sign_rqst(rqst, server); |
c95b8eed PS |
615 | if (rc) { |
616 | DeleteMidQEntry(mid); | |
fec344e3 | 617 | return ERR_PTR(rc); |
3c1bf7e4 PS |
618 | } |
619 | ||
fec344e3 | 620 | return mid; |
c95b8eed | 621 | } |
026e93dc PS |
622 | |
623 | int | |
624 | smb3_crypto_aead_allocate(struct TCP_Server_Info *server) | |
625 | { | |
626 | struct crypto_aead *tfm; | |
627 | ||
628 | if (!server->secmech.ccmaesencrypt) { | |
629 | tfm = crypto_alloc_aead("ccm(aes)", 0, 0); | |
630 | if (IS_ERR(tfm)) { | |
631 | cifs_dbg(VFS, "%s: Failed to alloc encrypt aead\n", | |
632 | __func__); | |
633 | return PTR_ERR(tfm); | |
634 | } | |
635 | server->secmech.ccmaesencrypt = tfm; | |
636 | } | |
637 | ||
638 | if (!server->secmech.ccmaesdecrypt) { | |
639 | tfm = crypto_alloc_aead("ccm(aes)", 0, 0); | |
640 | if (IS_ERR(tfm)) { | |
641 | crypto_free_aead(server->secmech.ccmaesencrypt); | |
642 | server->secmech.ccmaesencrypt = NULL; | |
643 | cifs_dbg(VFS, "%s: Failed to alloc decrypt aead\n", | |
644 | __func__); | |
645 | return PTR_ERR(tfm); | |
646 | } | |
647 | server->secmech.ccmaesdecrypt = tfm; | |
648 | } | |
649 | ||
650 | return 0; | |
651 | } |