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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 | ||
38bd4906 SP |
118 | static struct cifs_ses * |
119 | smb2_find_smb_ses_unlocked(struct TCP_Server_Info *server, __u64 ses_id) | |
32811d24 SP |
120 | { |
121 | struct cifs_ses *ses; | |
122 | ||
32811d24 | 123 | list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) { |
026e93dc | 124 | if (ses->Suid != ses_id) |
32811d24 | 125 | continue; |
32811d24 SP |
126 | return ses; |
127 | } | |
38bd4906 SP |
128 | |
129 | return NULL; | |
130 | } | |
131 | ||
132 | struct cifs_ses * | |
133 | smb2_find_smb_ses(struct TCP_Server_Info *server, __u64 ses_id) | |
134 | { | |
135 | struct cifs_ses *ses; | |
136 | ||
137 | spin_lock(&cifs_tcp_ses_lock); | |
138 | ses = smb2_find_smb_ses_unlocked(server, ses_id); | |
32811d24 SP |
139 | spin_unlock(&cifs_tcp_ses_lock); |
140 | ||
38bd4906 SP |
141 | return ses; |
142 | } | |
143 | ||
144 | static struct cifs_tcon * | |
145 | smb2_find_smb_sess_tcon_unlocked(struct cifs_ses *ses, __u32 tid) | |
146 | { | |
147 | struct cifs_tcon *tcon; | |
148 | ||
149 | list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { | |
150 | if (tcon->tid != tid) | |
151 | continue; | |
152 | ++tcon->tc_count; | |
153 | return tcon; | |
154 | } | |
155 | ||
32811d24 SP |
156 | return NULL; |
157 | } | |
158 | ||
38bd4906 SP |
159 | /* |
160 | * Obtain tcon corresponding to the tid in the given | |
161 | * cifs_ses | |
162 | */ | |
163 | ||
164 | struct cifs_tcon * | |
165 | smb2_find_smb_tcon(struct TCP_Server_Info *server, __u64 ses_id, __u32 tid) | |
166 | { | |
167 | struct cifs_ses *ses; | |
168 | struct cifs_tcon *tcon; | |
169 | ||
170 | spin_lock(&cifs_tcp_ses_lock); | |
171 | ses = smb2_find_smb_ses_unlocked(server, ses_id); | |
172 | if (!ses) { | |
173 | spin_unlock(&cifs_tcp_ses_lock); | |
174 | return NULL; | |
175 | } | |
176 | tcon = smb2_find_smb_sess_tcon_unlocked(ses, tid); | |
177 | spin_unlock(&cifs_tcp_ses_lock); | |
178 | ||
179 | return tcon; | |
180 | } | |
181 | ||
38107d45 | 182 | int |
0b688cfc | 183 | smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server) |
3c1bf7e4 | 184 | { |
16c568ef | 185 | int rc; |
3c1bf7e4 PS |
186 | unsigned char smb2_signature[SMB2_HMACSHA256_SIZE]; |
187 | unsigned char *sigptr = smb2_signature; | |
0b688cfc | 188 | struct kvec *iov = rqst->rq_iov; |
738f9de5 | 189 | struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[1].iov_base; |
32811d24 SP |
190 | struct cifs_ses *ses; |
191 | ||
026e93dc | 192 | ses = smb2_find_smb_ses(server, shdr->SessionId); |
32811d24 SP |
193 | if (!ses) { |
194 | cifs_dbg(VFS, "%s: Could not find session\n", __func__); | |
195 | return 0; | |
196 | } | |
3c1bf7e4 PS |
197 | |
198 | memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE); | |
31473fc4 | 199 | memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE); |
3c1bf7e4 | 200 | |
95dc8dd1 SF |
201 | rc = smb2_crypto_shash_allocate(server); |
202 | if (rc) { | |
203 | cifs_dbg(VFS, "%s: shah256 alloc failed\n", __func__); | |
204 | return rc; | |
205 | } | |
206 | ||
3c1bf7e4 | 207 | rc = crypto_shash_setkey(server->secmech.hmacsha256, |
32811d24 | 208 | ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE); |
3c1bf7e4 | 209 | if (rc) { |
f96637be | 210 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
3c1bf7e4 PS |
211 | return rc; |
212 | } | |
213 | ||
214 | rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash); | |
215 | if (rc) { | |
95dc8dd1 | 216 | cifs_dbg(VFS, "%s: Could not init sha256", __func__); |
3c1bf7e4 PS |
217 | return rc; |
218 | } | |
219 | ||
16c568ef AV |
220 | rc = __cifs_calc_signature(rqst, server, sigptr, |
221 | &server->secmech.sdeschmacsha256->shash); | |
3c1bf7e4 | 222 | |
16c568ef | 223 | if (!rc) |
31473fc4 | 224 | memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE); |
3c1bf7e4 PS |
225 | |
226 | return rc; | |
227 | } | |
228 | ||
373512ec SF |
229 | static int generate_key(struct cifs_ses *ses, struct kvec label, |
230 | struct kvec context, __u8 *key, unsigned int key_size) | |
429b46f4 SF |
231 | { |
232 | unsigned char zero = 0x0; | |
233 | __u8 i[4] = {0, 0, 0, 1}; | |
234 | __u8 L[4] = {0, 0, 0, 128}; | |
235 | int rc = 0; | |
236 | unsigned char prfhash[SMB2_HMACSHA256_SIZE]; | |
237 | unsigned char *hashptr = prfhash; | |
238 | ||
239 | memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE); | |
373512ec | 240 | memset(key, 0x0, key_size); |
429b46f4 | 241 | |
32811d24 | 242 | rc = smb3_crypto_shash_allocate(ses->server); |
95dc8dd1 SF |
243 | if (rc) { |
244 | cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__); | |
245 | goto smb3signkey_ret; | |
246 | } | |
247 | ||
32811d24 SP |
248 | rc = crypto_shash_setkey(ses->server->secmech.hmacsha256, |
249 | ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE); | |
429b46f4 SF |
250 | if (rc) { |
251 | cifs_dbg(VFS, "%s: Could not set with session key\n", __func__); | |
252 | goto smb3signkey_ret; | |
253 | } | |
254 | ||
32811d24 | 255 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacsha256->shash); |
429b46f4 SF |
256 | if (rc) { |
257 | cifs_dbg(VFS, "%s: Could not init sign hmac\n", __func__); | |
258 | goto smb3signkey_ret; | |
259 | } | |
260 | ||
32811d24 | 261 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
429b46f4 SF |
262 | i, 4); |
263 | if (rc) { | |
264 | cifs_dbg(VFS, "%s: Could not update with n\n", __func__); | |
265 | goto smb3signkey_ret; | |
266 | } | |
267 | ||
32811d24 | 268 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
373512ec | 269 | label.iov_base, label.iov_len); |
429b46f4 SF |
270 | if (rc) { |
271 | cifs_dbg(VFS, "%s: Could not update with label\n", __func__); | |
272 | goto smb3signkey_ret; | |
273 | } | |
274 | ||
32811d24 | 275 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
429b46f4 SF |
276 | &zero, 1); |
277 | if (rc) { | |
278 | cifs_dbg(VFS, "%s: Could not update with zero\n", __func__); | |
279 | goto smb3signkey_ret; | |
280 | } | |
281 | ||
32811d24 | 282 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
373512ec | 283 | context.iov_base, context.iov_len); |
429b46f4 SF |
284 | if (rc) { |
285 | cifs_dbg(VFS, "%s: Could not update with context\n", __func__); | |
286 | goto smb3signkey_ret; | |
287 | } | |
288 | ||
32811d24 | 289 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
429b46f4 SF |
290 | L, 4); |
291 | if (rc) { | |
292 | cifs_dbg(VFS, "%s: Could not update with L\n", __func__); | |
293 | goto smb3signkey_ret; | |
294 | } | |
295 | ||
32811d24 | 296 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacsha256->shash, |
429b46f4 SF |
297 | hashptr); |
298 | if (rc) { | |
299 | cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__); | |
300 | goto smb3signkey_ret; | |
301 | } | |
302 | ||
373512ec | 303 | memcpy(key, hashptr, key_size); |
429b46f4 SF |
304 | |
305 | smb3signkey_ret: | |
32811d24 | 306 | return rc; |
429b46f4 SF |
307 | } |
308 | ||
373512ec SF |
309 | struct derivation { |
310 | struct kvec label; | |
311 | struct kvec context; | |
312 | }; | |
313 | ||
314 | struct derivation_triplet { | |
315 | struct derivation signing; | |
316 | struct derivation encryption; | |
317 | struct derivation decryption; | |
318 | }; | |
319 | ||
320 | static int | |
321 | generate_smb3signingkey(struct cifs_ses *ses, | |
322 | const struct derivation_triplet *ptriplet) | |
323 | { | |
324 | int rc; | |
325 | ||
326 | rc = generate_key(ses, ptriplet->signing.label, | |
327 | ptriplet->signing.context, ses->smb3signingkey, | |
328 | SMB3_SIGN_KEY_SIZE); | |
329 | if (rc) | |
330 | return rc; | |
331 | ||
332 | rc = generate_key(ses, ptriplet->encryption.label, | |
333 | ptriplet->encryption.context, ses->smb3encryptionkey, | |
334 | SMB3_SIGN_KEY_SIZE); | |
335 | if (rc) | |
336 | return rc; | |
337 | ||
338 | return generate_key(ses, ptriplet->decryption.label, | |
339 | ptriplet->decryption.context, | |
340 | ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE); | |
341 | } | |
342 | ||
343 | int | |
344 | generate_smb30signingkey(struct cifs_ses *ses) | |
345 | ||
346 | { | |
347 | struct derivation_triplet triplet; | |
348 | struct derivation *d; | |
349 | ||
350 | d = &triplet.signing; | |
351 | d->label.iov_base = "SMB2AESCMAC"; | |
352 | d->label.iov_len = 12; | |
353 | d->context.iov_base = "SmbSign"; | |
354 | d->context.iov_len = 8; | |
355 | ||
356 | d = &triplet.encryption; | |
357 | d->label.iov_base = "SMB2AESCCM"; | |
358 | d->label.iov_len = 11; | |
359 | d->context.iov_base = "ServerIn "; | |
360 | d->context.iov_len = 10; | |
361 | ||
362 | d = &triplet.decryption; | |
363 | d->label.iov_base = "SMB2AESCCM"; | |
364 | d->label.iov_len = 11; | |
365 | d->context.iov_base = "ServerOut"; | |
366 | d->context.iov_len = 10; | |
367 | ||
368 | return generate_smb3signingkey(ses, &triplet); | |
369 | } | |
370 | ||
371 | int | |
372 | generate_smb311signingkey(struct cifs_ses *ses) | |
373 | ||
374 | { | |
375 | struct derivation_triplet triplet; | |
376 | struct derivation *d; | |
377 | ||
378 | d = &triplet.signing; | |
379 | d->label.iov_base = "SMB2AESCMAC"; | |
380 | d->label.iov_len = 12; | |
381 | d->context.iov_base = "SmbSign"; | |
382 | d->context.iov_len = 8; | |
383 | ||
384 | d = &triplet.encryption; | |
385 | d->label.iov_base = "SMB2AESCCM"; | |
386 | d->label.iov_len = 11; | |
387 | d->context.iov_base = "ServerIn "; | |
388 | d->context.iov_len = 10; | |
389 | ||
390 | d = &triplet.decryption; | |
391 | d->label.iov_base = "SMB2AESCCM"; | |
392 | d->label.iov_len = 11; | |
393 | d->context.iov_base = "ServerOut"; | |
394 | d->context.iov_len = 10; | |
395 | ||
396 | return generate_smb3signingkey(ses, &triplet); | |
397 | } | |
398 | ||
38107d45 SF |
399 | int |
400 | smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server) | |
401 | { | |
32811d24 | 402 | int rc = 0; |
429b46f4 SF |
403 | unsigned char smb3_signature[SMB2_CMACAES_SIZE]; |
404 | unsigned char *sigptr = smb3_signature; | |
405 | struct kvec *iov = rqst->rq_iov; | |
738f9de5 | 406 | struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[1].iov_base; |
32811d24 SP |
407 | struct cifs_ses *ses; |
408 | ||
026e93dc | 409 | ses = smb2_find_smb_ses(server, shdr->SessionId); |
32811d24 SP |
410 | if (!ses) { |
411 | cifs_dbg(VFS, "%s: Could not find session\n", __func__); | |
412 | return 0; | |
413 | } | |
429b46f4 SF |
414 | |
415 | memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE); | |
31473fc4 | 416 | memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE); |
429b46f4 SF |
417 | |
418 | rc = crypto_shash_setkey(server->secmech.cmacaes, | |
32811d24 SP |
419 | ses->smb3signingkey, SMB2_CMACAES_SIZE); |
420 | ||
429b46f4 SF |
421 | if (rc) { |
422 | cifs_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__); | |
423 | return rc; | |
424 | } | |
425 | ||
95dc8dd1 SF |
426 | /* |
427 | * we already allocate sdesccmacaes when we init smb3 signing key, | |
428 | * so unlike smb2 case we do not have to check here if secmech are | |
429 | * initialized | |
430 | */ | |
429b46f4 SF |
431 | rc = crypto_shash_init(&server->secmech.sdesccmacaes->shash); |
432 | if (rc) { | |
433 | cifs_dbg(VFS, "%s: Could not init cmac aes\n", __func__); | |
434 | return rc; | |
435 | } | |
16c568ef AV |
436 | |
437 | rc = __cifs_calc_signature(rqst, server, sigptr, | |
438 | &server->secmech.sdesccmacaes->shash); | |
429b46f4 | 439 | |
16c568ef | 440 | if (!rc) |
31473fc4 | 441 | memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE); |
429b46f4 SF |
442 | |
443 | return rc; | |
38107d45 SF |
444 | } |
445 | ||
3c1bf7e4 PS |
446 | /* must be called with server->srv_mutex held */ |
447 | static int | |
0b688cfc | 448 | smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server) |
3c1bf7e4 PS |
449 | { |
450 | int rc = 0; | |
738f9de5 PS |
451 | struct smb2_sync_hdr *shdr = |
452 | (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base; | |
3c1bf7e4 | 453 | |
31473fc4 | 454 | if (!(shdr->Flags & SMB2_FLAGS_SIGNED) || |
3c1bf7e4 PS |
455 | server->tcpStatus == CifsNeedNegotiate) |
456 | return rc; | |
457 | ||
458 | if (!server->session_estab) { | |
31473fc4 | 459 | strncpy(shdr->Signature, "BSRSPYL", 8); |
3c1bf7e4 PS |
460 | return rc; |
461 | } | |
462 | ||
38107d45 | 463 | rc = server->ops->calc_signature(rqst, server); |
3c1bf7e4 PS |
464 | |
465 | return rc; | |
466 | } | |
467 | ||
468 | int | |
0b688cfc | 469 | smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server) |
3c1bf7e4 PS |
470 | { |
471 | unsigned int rc; | |
472 | char server_response_sig[16]; | |
738f9de5 PS |
473 | struct smb2_sync_hdr *shdr = |
474 | (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base; | |
3c1bf7e4 | 475 | |
31473fc4 PS |
476 | if ((shdr->Command == SMB2_NEGOTIATE) || |
477 | (shdr->Command == SMB2_SESSION_SETUP) || | |
478 | (shdr->Command == SMB2_OPLOCK_BREAK) || | |
3c1bf7e4 PS |
479 | (!server->session_estab)) |
480 | return 0; | |
481 | ||
482 | /* | |
483 | * BB what if signatures are supposed to be on for session but | |
484 | * server does not send one? BB | |
485 | */ | |
486 | ||
487 | /* Do not need to verify session setups with signature "BSRSPYL " */ | |
31473fc4 | 488 | if (memcmp(shdr->Signature, "BSRSPYL ", 8) == 0) |
f96637be | 489 | cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n", |
31473fc4 | 490 | shdr->Command); |
3c1bf7e4 PS |
491 | |
492 | /* | |
493 | * Save off the origiginal signature so we can modify the smb and check | |
494 | * our calculated signature against what the server sent. | |
495 | */ | |
31473fc4 | 496 | memcpy(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE); |
3c1bf7e4 | 497 | |
31473fc4 | 498 | memset(shdr->Signature, 0, SMB2_SIGNATURE_SIZE); |
3c1bf7e4 PS |
499 | |
500 | mutex_lock(&server->srv_mutex); | |
38107d45 | 501 | rc = server->ops->calc_signature(rqst, server); |
3c1bf7e4 PS |
502 | mutex_unlock(&server->srv_mutex); |
503 | ||
504 | if (rc) | |
505 | return rc; | |
506 | ||
31473fc4 | 507 | if (memcmp(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE)) |
3c1bf7e4 PS |
508 | return -EACCES; |
509 | else | |
510 | return 0; | |
511 | } | |
512 | ||
2dc7e1c0 PS |
513 | /* |
514 | * Set message id for the request. Should be called after wait_for_free_request | |
515 | * and when srv_mutex is held. | |
516 | */ | |
517 | static inline void | |
31473fc4 PS |
518 | smb2_seq_num_into_buf(struct TCP_Server_Info *server, |
519 | struct smb2_sync_hdr *shdr) | |
2dc7e1c0 | 520 | { |
31473fc4 | 521 | unsigned int i, num = le16_to_cpu(shdr->CreditCharge); |
cb7e9eab | 522 | |
31473fc4 | 523 | shdr->MessageId = get_next_mid64(server); |
cb7e9eab PS |
524 | /* skip message numbers according to CreditCharge field */ |
525 | for (i = 1; i < num; i++) | |
526 | get_next_mid(server); | |
2dc7e1c0 PS |
527 | } |
528 | ||
529 | static struct mid_q_entry * | |
31473fc4 | 530 | smb2_mid_entry_alloc(const struct smb2_sync_hdr *shdr, |
2dc7e1c0 PS |
531 | struct TCP_Server_Info *server) |
532 | { | |
533 | struct mid_q_entry *temp; | |
534 | ||
535 | if (server == NULL) { | |
f96637be | 536 | cifs_dbg(VFS, "Null TCP session in smb2_mid_entry_alloc\n"); |
2dc7e1c0 PS |
537 | return NULL; |
538 | } | |
539 | ||
540 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); | |
a6f74e80 N |
541 | memset(temp, 0, sizeof(struct mid_q_entry)); |
542 | temp->mid = le64_to_cpu(shdr->MessageId); | |
543 | temp->pid = current->pid; | |
544 | temp->command = shdr->Command; /* Always LE */ | |
545 | temp->when_alloc = jiffies; | |
546 | temp->server = server; | |
547 | ||
548 | /* | |
549 | * The default is for the mid to be synchronous, so the | |
550 | * default callback just wakes up the current task. | |
551 | */ | |
552 | temp->callback = cifs_wake_up_task; | |
553 | temp->callback_data = current; | |
2dc7e1c0 PS |
554 | |
555 | atomic_inc(&midCount); | |
556 | temp->mid_state = MID_REQUEST_ALLOCATED; | |
557 | return temp; | |
558 | } | |
559 | ||
560 | static int | |
31473fc4 | 561 | smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_sync_hdr *shdr, |
2dc7e1c0 PS |
562 | struct mid_q_entry **mid) |
563 | { | |
564 | if (ses->server->tcpStatus == CifsExiting) | |
565 | return -ENOENT; | |
566 | ||
567 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 568 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
2dc7e1c0 PS |
569 | return -EAGAIN; |
570 | } | |
571 | ||
7f48558e | 572 | if (ses->status == CifsNew) { |
31473fc4 PS |
573 | if ((shdr->Command != SMB2_SESSION_SETUP) && |
574 | (shdr->Command != SMB2_NEGOTIATE)) | |
2dc7e1c0 PS |
575 | return -EAGAIN; |
576 | /* else ok - we are setting up session */ | |
577 | } | |
7f48558e SP |
578 | |
579 | if (ses->status == CifsExiting) { | |
31473fc4 | 580 | if (shdr->Command != SMB2_LOGOFF) |
7f48558e SP |
581 | return -EAGAIN; |
582 | /* else ok - we are shutting down the session */ | |
583 | } | |
584 | ||
31473fc4 | 585 | *mid = smb2_mid_entry_alloc(shdr, ses->server); |
2dc7e1c0 PS |
586 | if (*mid == NULL) |
587 | return -ENOMEM; | |
588 | spin_lock(&GlobalMid_Lock); | |
589 | list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q); | |
590 | spin_unlock(&GlobalMid_Lock); | |
591 | return 0; | |
592 | } | |
593 | ||
594 | int | |
595 | smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
596 | bool log_error) | |
597 | { | |
598 | unsigned int len = get_rfc1002_length(mid->resp_buf); | |
738f9de5 PS |
599 | struct kvec iov[2]; |
600 | struct smb_rqst rqst = { .rq_iov = iov, | |
601 | .rq_nvec = 2 }; | |
0b688cfc | 602 | |
738f9de5 PS |
603 | iov[0].iov_base = (char *)mid->resp_buf; |
604 | iov[0].iov_len = 4; | |
605 | iov[1].iov_base = (char *)mid->resp_buf + 4; | |
606 | iov[1].iov_len = len; | |
2dc7e1c0 PS |
607 | |
608 | dump_smb(mid->resp_buf, min_t(u32, 80, len)); | |
609 | /* convert the length into a more usable form */ | |
4326ed2f | 610 | if (len > 24 && server->sign && !mid->decrypted) { |
3c1bf7e4 PS |
611 | int rc; |
612 | ||
0b688cfc | 613 | rc = smb2_verify_signature(&rqst, server); |
3c1bf7e4 | 614 | if (rc) |
f96637be JP |
615 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
616 | rc); | |
3c1bf7e4 | 617 | } |
2dc7e1c0 PS |
618 | |
619 | return map_smb2_to_linux_error(mid->resp_buf, log_error); | |
620 | } | |
621 | ||
fec344e3 JL |
622 | struct mid_q_entry * |
623 | smb2_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
2dc7e1c0 PS |
624 | { |
625 | int rc; | |
738f9de5 PS |
626 | struct smb2_sync_hdr *shdr = |
627 | (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base; | |
2dc7e1c0 PS |
628 | struct mid_q_entry *mid; |
629 | ||
31473fc4 | 630 | smb2_seq_num_into_buf(ses->server, shdr); |
2dc7e1c0 | 631 | |
31473fc4 | 632 | rc = smb2_get_mid_entry(ses, shdr, &mid); |
2dc7e1c0 | 633 | if (rc) |
fec344e3 JL |
634 | return ERR_PTR(rc); |
635 | rc = smb2_sign_rqst(rqst, ses->server); | |
636 | if (rc) { | |
3c1bf7e4 | 637 | cifs_delete_mid(mid); |
fec344e3 JL |
638 | return ERR_PTR(rc); |
639 | } | |
640 | return mid; | |
2dc7e1c0 PS |
641 | } |
642 | ||
fec344e3 JL |
643 | struct mid_q_entry * |
644 | smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
c95b8eed | 645 | { |
fec344e3 | 646 | int rc; |
738f9de5 PS |
647 | struct smb2_sync_hdr *shdr = |
648 | (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base; | |
c95b8eed PS |
649 | struct mid_q_entry *mid; |
650 | ||
31473fc4 | 651 | smb2_seq_num_into_buf(server, shdr); |
c95b8eed | 652 | |
31473fc4 | 653 | mid = smb2_mid_entry_alloc(shdr, server); |
c95b8eed | 654 | if (mid == NULL) |
fec344e3 | 655 | return ERR_PTR(-ENOMEM); |
c95b8eed | 656 | |
fec344e3 | 657 | rc = smb2_sign_rqst(rqst, server); |
c95b8eed PS |
658 | if (rc) { |
659 | DeleteMidQEntry(mid); | |
fec344e3 | 660 | return ERR_PTR(rc); |
3c1bf7e4 PS |
661 | } |
662 | ||
fec344e3 | 663 | return mid; |
c95b8eed | 664 | } |
026e93dc PS |
665 | |
666 | int | |
667 | smb3_crypto_aead_allocate(struct TCP_Server_Info *server) | |
668 | { | |
669 | struct crypto_aead *tfm; | |
670 | ||
671 | if (!server->secmech.ccmaesencrypt) { | |
672 | tfm = crypto_alloc_aead("ccm(aes)", 0, 0); | |
673 | if (IS_ERR(tfm)) { | |
674 | cifs_dbg(VFS, "%s: Failed to alloc encrypt aead\n", | |
675 | __func__); | |
676 | return PTR_ERR(tfm); | |
677 | } | |
678 | server->secmech.ccmaesencrypt = tfm; | |
679 | } | |
680 | ||
681 | if (!server->secmech.ccmaesdecrypt) { | |
682 | tfm = crypto_alloc_aead("ccm(aes)", 0, 0); | |
683 | if (IS_ERR(tfm)) { | |
684 | crypto_free_aead(server->secmech.ccmaesencrypt); | |
685 | server->secmech.ccmaesencrypt = NULL; | |
686 | cifs_dbg(VFS, "%s: Failed to alloc decrypt aead\n", | |
687 | __func__); | |
688 | return PTR_ERR(tfm); | |
689 | } | |
690 | server->secmech.ccmaesdecrypt = tfm; | |
691 | } | |
692 | ||
693 | return 0; | |
694 | } |