1 // SPDX-License-Identifier: LGPL-2.1
2 /*
3 *
4 * SMB/CIFS session setup handling routines
5 *
6 * Copyright (c) International Business Machines Corp., 2006, 2009
7 * Author(s): Steve French (sfrench@us.ibm.com)
8 *
9 */
10
11 #include "cifspdu.h"
12 #include "cifsglob.h"
13 #include "cifsproto.h"
14 #include "cifs_unicode.h"
15 #include "cifs_debug.h"
16 #include "ntlmssp.h"
17 #include "nterr.h"
18 #include <linux/utsname.h>
19 #include <linux/slab.h>
20 #include <linux/version.h>
21 #include "cifsfs.h"
22 #include "cifs_spnego.h"
23 #include "smb2proto.h"
24 #include "fs_context.h"
25
26 static int
27 cifs_ses_add_channel(struct cifs_ses *ses,
28 struct cifs_server_iface *iface);
29
30 bool
is_server_using_iface(struct TCP_Server_Info * server,struct cifs_server_iface * iface)31 is_server_using_iface(struct TCP_Server_Info *server,
32 struct cifs_server_iface *iface)
33 {
34 struct sockaddr_in *i4 = (struct sockaddr_in *)&iface->sockaddr;
35 struct sockaddr_in6 *i6 = (struct sockaddr_in6 *)&iface->sockaddr;
36 struct sockaddr_in *s4 = (struct sockaddr_in *)&server->dstaddr;
37 struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)&server->dstaddr;
38
39 if (server->dstaddr.ss_family != iface->sockaddr.ss_family)
40 return false;
41 if (server->dstaddr.ss_family == AF_INET) {
42 if (s4->sin_addr.s_addr != i4->sin_addr.s_addr)
43 return false;
44 } else if (server->dstaddr.ss_family == AF_INET6) {
45 if (memcmp(&s6->sin6_addr, &i6->sin6_addr,
46 sizeof(i6->sin6_addr)) != 0)
47 return false;
48 } else {
49 /* unknown family.. */
50 return false;
51 }
52 return true;
53 }
54
is_ses_using_iface(struct cifs_ses * ses,struct cifs_server_iface * iface)55 bool is_ses_using_iface(struct cifs_ses *ses, struct cifs_server_iface *iface)
56 {
57 int i;
58
59 spin_lock(&ses->chan_lock);
60 for (i = 0; i < ses->chan_count; i++) {
61 if (ses->chans[i].iface == iface) {
62 spin_unlock(&ses->chan_lock);
63 return true;
64 }
65 }
66 spin_unlock(&ses->chan_lock);
67 return false;
68 }
69
70 /* channel helper functions. assumed that chan_lock is held by caller. */
71
72 int
cifs_ses_get_chan_index(struct cifs_ses * ses,struct TCP_Server_Info * server)73 cifs_ses_get_chan_index(struct cifs_ses *ses,
74 struct TCP_Server_Info *server)
75 {
76 unsigned int i;
77
78 /* if the channel is waiting for termination */
79 if (server && server->terminate)
80 return CIFS_INVAL_CHAN_INDEX;
81
82 for (i = 0; i < ses->chan_count; i++) {
83 if (ses->chans[i].server == server)
84 return i;
85 }
86
87 /* If we didn't find the channel, it is likely a bug */
88 if (server)
89 cifs_dbg(VFS, "unable to get chan index for server: 0x%llx",
90 server->conn_id);
91 return CIFS_INVAL_CHAN_INDEX;
92 }
93
94 void
cifs_chan_set_in_reconnect(struct cifs_ses * ses,struct TCP_Server_Info * server)95 cifs_chan_set_in_reconnect(struct cifs_ses *ses,
96 struct TCP_Server_Info *server)
97 {
98 int chan_index = cifs_ses_get_chan_index(ses, server);
99
100 if (chan_index == CIFS_INVAL_CHAN_INDEX)
101 return;
102
103 ses->chans[chan_index].in_reconnect = true;
104 }
105
106 void
cifs_chan_clear_in_reconnect(struct cifs_ses * ses,struct TCP_Server_Info * server)107 cifs_chan_clear_in_reconnect(struct cifs_ses *ses,
108 struct TCP_Server_Info *server)
109 {
110 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
111
112 if (chan_index == CIFS_INVAL_CHAN_INDEX)
113 return;
114
115 ses->chans[chan_index].in_reconnect = false;
116 }
117
118 bool
cifs_chan_in_reconnect(struct cifs_ses * ses,struct TCP_Server_Info * server)119 cifs_chan_in_reconnect(struct cifs_ses *ses,
120 struct TCP_Server_Info *server)
121 {
122 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
123
124 if (chan_index == CIFS_INVAL_CHAN_INDEX)
125 return true; /* err on the safer side */
126
127 return CIFS_CHAN_IN_RECONNECT(ses, chan_index);
128 }
129
130 void
cifs_chan_set_need_reconnect(struct cifs_ses * ses,struct TCP_Server_Info * server)131 cifs_chan_set_need_reconnect(struct cifs_ses *ses,
132 struct TCP_Server_Info *server)
133 {
134 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
135
136 if (chan_index == CIFS_INVAL_CHAN_INDEX)
137 return;
138
139 set_bit(chan_index, &ses->chans_need_reconnect);
140 cifs_dbg(FYI, "Set reconnect bitmask for chan %u; now 0x%lx\n",
141 chan_index, ses->chans_need_reconnect);
142 }
143
144 void
cifs_chan_clear_need_reconnect(struct cifs_ses * ses,struct TCP_Server_Info * server)145 cifs_chan_clear_need_reconnect(struct cifs_ses *ses,
146 struct TCP_Server_Info *server)
147 {
148 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
149
150 if (chan_index == CIFS_INVAL_CHAN_INDEX)
151 return;
152
153 clear_bit(chan_index, &ses->chans_need_reconnect);
154 cifs_dbg(FYI, "Cleared reconnect bitmask for chan %u; now 0x%lx\n",
155 chan_index, ses->chans_need_reconnect);
156 }
157
158 bool
cifs_chan_needs_reconnect(struct cifs_ses * ses,struct TCP_Server_Info * server)159 cifs_chan_needs_reconnect(struct cifs_ses *ses,
160 struct TCP_Server_Info *server)
161 {
162 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
163
164 if (chan_index == CIFS_INVAL_CHAN_INDEX)
165 return true; /* err on the safer side */
166
167 return CIFS_CHAN_NEEDS_RECONNECT(ses, chan_index);
168 }
169
170 bool
cifs_chan_is_iface_active(struct cifs_ses * ses,struct TCP_Server_Info * server)171 cifs_chan_is_iface_active(struct cifs_ses *ses,
172 struct TCP_Server_Info *server)
173 {
174 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
175
176 if (chan_index == CIFS_INVAL_CHAN_INDEX)
177 return true; /* err on the safer side */
178
179 return ses->chans[chan_index].iface &&
180 ses->chans[chan_index].iface->is_active;
181 }
182
183 /* returns number of channels added */
cifs_try_adding_channels(struct cifs_ses * ses)184 int cifs_try_adding_channels(struct cifs_ses *ses)
185 {
186 struct TCP_Server_Info *server = ses->server;
187 int old_chan_count, new_chan_count;
188 int left;
189 int rc = 0;
190 int tries = 0;
191 size_t iface_weight = 0, iface_min_speed = 0;
192 struct cifs_server_iface *iface = NULL, *niface = NULL;
193 struct cifs_server_iface *last_iface = NULL;
194
195 spin_lock(&ses->chan_lock);
196
197 new_chan_count = old_chan_count = ses->chan_count;
198 left = ses->chan_max - ses->chan_count;
199
200 if (left <= 0) {
201 spin_unlock(&ses->chan_lock);
202 cifs_dbg(FYI,
203 "ses already at max_channels (%zu), nothing to open\n",
204 ses->chan_max);
205 return 0;
206 }
207
208 if (server->dialect < SMB30_PROT_ID) {
209 spin_unlock(&ses->chan_lock);
210 cifs_dbg(VFS, "multichannel is not supported on this protocol version, use 3.0 or above\n");
211 return 0;
212 }
213
214 if (!(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
215 spin_unlock(&ses->chan_lock);
216 cifs_server_dbg(VFS, "no multichannel support\n");
217 return 0;
218 }
219 spin_unlock(&ses->chan_lock);
220
221 while (left > 0) {
222
223 tries++;
224 if (tries > 3*ses->chan_max) {
225 cifs_dbg(VFS, "too many channel open attempts (%d channels left to open)\n",
226 left);
227 break;
228 }
229
230 spin_lock(&ses->iface_lock);
231 if (!ses->iface_count) {
232 spin_unlock(&ses->iface_lock);
233 cifs_dbg(ONCE, "server %s does not advertise interfaces\n",
234 ses->server->hostname);
235 break;
236 }
237
238 if (!iface)
239 iface = list_first_entry(&ses->iface_list, struct cifs_server_iface,
240 iface_head);
241 last_iface = list_last_entry(&ses->iface_list, struct cifs_server_iface,
242 iface_head);
243 iface_min_speed = last_iface->speed;
244
245 list_for_each_entry_safe_from(iface, niface, &ses->iface_list,
246 iface_head) {
247 /* do not mix rdma and non-rdma interfaces */
248 if (iface->rdma_capable != ses->server->rdma)
249 continue;
250
251 /* skip ifaces that are unusable */
252 if (!iface->is_active ||
253 (is_ses_using_iface(ses, iface) &&
254 !iface->rss_capable))
255 continue;
256
257 /* check if we already allocated enough channels */
258 iface_weight = iface->speed / iface_min_speed;
259
260 if (iface->weight_fulfilled >= iface_weight)
261 continue;
262
263 /* take ref before unlock */
264 kref_get(&iface->refcount);
265
266 spin_unlock(&ses->iface_lock);
267 rc = cifs_ses_add_channel(ses, iface);
268 spin_lock(&ses->iface_lock);
269
270 if (rc) {
271 cifs_dbg(VFS, "failed to open extra channel on iface:%pIS rc=%d\n",
272 &iface->sockaddr,
273 rc);
274 kref_put(&iface->refcount, release_iface);
275 /* failure to add chan should increase weight */
276 iface->weight_fulfilled++;
277 continue;
278 }
279
280 iface->num_channels++;
281 iface->weight_fulfilled++;
282 cifs_dbg(VFS, "successfully opened new channel on iface:%pIS\n",
283 &iface->sockaddr);
284 break;
285 }
286
287 /* reached end of list. reset weight_fulfilled and start over */
288 if (list_entry_is_head(iface, &ses->iface_list, iface_head)) {
289 list_for_each_entry(iface, &ses->iface_list, iface_head)
290 iface->weight_fulfilled = 0;
291 spin_unlock(&ses->iface_lock);
292 iface = NULL;
293 continue;
294 }
295 spin_unlock(&ses->iface_lock);
296
297 left--;
298 new_chan_count++;
299 }
300
301 return new_chan_count - old_chan_count;
302 }
303
304 /*
305 * called when multichannel is disabled by the server.
306 * this always gets called from smb2_reconnect
307 * and cannot get called in parallel threads.
308 */
309 void
cifs_disable_secondary_channels(struct cifs_ses * ses)310 cifs_disable_secondary_channels(struct cifs_ses *ses)
311 {
312 int i, chan_count;
313 struct TCP_Server_Info *server;
314 struct cifs_server_iface *iface;
315
316 spin_lock(&ses->chan_lock);
317 chan_count = ses->chan_count;
318 if (chan_count == 1)
319 goto done;
320
321 ses->chan_count = 1;
322
323 /* for all secondary channels reset the need reconnect bit */
324 ses->chans_need_reconnect &= 1;
325
326 for (i = 1; i < chan_count; i++) {
327 iface = ses->chans[i].iface;
328 server = ses->chans[i].server;
329
330 /*
331 * remove these references first, since we need to unlock
332 * the chan_lock here, since iface_lock is a higher lock
333 */
334 ses->chans[i].iface = NULL;
335 ses->chans[i].server = NULL;
336 spin_unlock(&ses->chan_lock);
337
338 if (iface) {
339 spin_lock(&ses->iface_lock);
340 iface->num_channels--;
341 if (iface->weight_fulfilled)
342 iface->weight_fulfilled--;
343 kref_put(&iface->refcount, release_iface);
344 spin_unlock(&ses->iface_lock);
345 }
346
347 if (server) {
348 if (!server->terminate) {
349 server->terminate = true;
350 cifs_signal_cifsd_for_reconnect(server, false);
351 }
352 cifs_put_tcp_session(server, false);
353 }
354
355 spin_lock(&ses->chan_lock);
356 }
357
358 done:
359 spin_unlock(&ses->chan_lock);
360 }
361
362 /*
363 * update the iface for the channel if necessary.
364 * Must be called with chan_lock held.
365 */
366 void
cifs_chan_update_iface(struct cifs_ses * ses,struct TCP_Server_Info * server)367 cifs_chan_update_iface(struct cifs_ses *ses, struct TCP_Server_Info *server)
368 {
369 unsigned int chan_index;
370 size_t iface_weight = 0, iface_min_speed = 0;
371 struct cifs_server_iface *iface = NULL;
372 struct cifs_server_iface *old_iface = NULL;
373 struct cifs_server_iface *last_iface = NULL;
374 struct sockaddr_storage ss;
375
376 spin_lock(&ses->chan_lock);
377 chan_index = cifs_ses_get_chan_index(ses, server);
378 if (chan_index == CIFS_INVAL_CHAN_INDEX) {
379 spin_unlock(&ses->chan_lock);
380 return;
381 }
382
383 if (ses->chans[chan_index].iface) {
384 old_iface = ses->chans[chan_index].iface;
385 if (old_iface->is_active) {
386 spin_unlock(&ses->chan_lock);
387 return;
388 }
389 }
390 spin_unlock(&ses->chan_lock);
391
392 spin_lock(&server->srv_lock);
393 ss = server->dstaddr;
394 spin_unlock(&server->srv_lock);
395
396 spin_lock(&ses->iface_lock);
397 if (!ses->iface_count) {
398 spin_unlock(&ses->iface_lock);
399 cifs_dbg(ONCE, "server %s does not advertise interfaces\n", ses->server->hostname);
400 return;
401 }
402
403 last_iface = list_last_entry(&ses->iface_list, struct cifs_server_iface,
404 iface_head);
405 iface_min_speed = last_iface->speed;
406
407 /* then look for a new one */
408 list_for_each_entry(iface, &ses->iface_list, iface_head) {
409 if (!chan_index) {
410 /* if we're trying to get the updated iface for primary channel */
411 if (!cifs_match_ipaddr((struct sockaddr *) &ss,
412 (struct sockaddr *) &iface->sockaddr))
413 continue;
414
415 kref_get(&iface->refcount);
416 break;
417 }
418
419 /* do not mix rdma and non-rdma interfaces */
420 if (iface->rdma_capable != server->rdma)
421 continue;
422
423 if (!iface->is_active ||
424 (is_ses_using_iface(ses, iface) &&
425 !iface->rss_capable)) {
426 continue;
427 }
428
429 /* check if we already allocated enough channels */
430 iface_weight = iface->speed / iface_min_speed;
431
432 if (iface->weight_fulfilled >= iface_weight)
433 continue;
434
435 kref_get(&iface->refcount);
436 break;
437 }
438
439 if (list_entry_is_head(iface, &ses->iface_list, iface_head)) {
440 iface = NULL;
441 cifs_dbg(FYI, "unable to find a suitable iface\n");
442 }
443
444 if (!iface) {
445 if (!chan_index)
446 cifs_dbg(FYI, "unable to get the interface matching: %pIS\n",
447 &ss);
448 else {
449 cifs_dbg(FYI, "unable to find another interface to replace: %pIS\n",
450 &old_iface->sockaddr);
451 }
452
453 spin_unlock(&ses->iface_lock);
454 return;
455 }
456
457 /* now drop the ref to the current iface */
458 if (old_iface) {
459 cifs_dbg(FYI, "replacing iface: %pIS with %pIS\n",
460 &old_iface->sockaddr,
461 &iface->sockaddr);
462
463 old_iface->num_channels--;
464 if (old_iface->weight_fulfilled)
465 old_iface->weight_fulfilled--;
466 iface->num_channels++;
467 iface->weight_fulfilled++;
468
469 kref_put(&old_iface->refcount, release_iface);
470 } else if (!chan_index) {
471 /* special case: update interface for primary channel */
472 cifs_dbg(FYI, "referencing primary channel iface: %pIS\n",
473 &iface->sockaddr);
474 iface->num_channels++;
475 iface->weight_fulfilled++;
476 }
477 spin_unlock(&ses->iface_lock);
478
479 spin_lock(&ses->chan_lock);
480 chan_index = cifs_ses_get_chan_index(ses, server);
481 if (chan_index == CIFS_INVAL_CHAN_INDEX) {
482 spin_unlock(&ses->chan_lock);
483 return;
484 }
485
486 ses->chans[chan_index].iface = iface;
487 spin_unlock(&ses->chan_lock);
488
489 spin_lock(&server->srv_lock);
490 memcpy(&server->dstaddr, &iface->sockaddr, sizeof(server->dstaddr));
491 spin_unlock(&server->srv_lock);
492 }
493
494 /*
495 * If server is a channel of ses, return the corresponding enclosing
496 * cifs_chan otherwise return NULL.
497 */
498 struct cifs_chan *
cifs_ses_find_chan(struct cifs_ses * ses,struct TCP_Server_Info * server)499 cifs_ses_find_chan(struct cifs_ses *ses, struct TCP_Server_Info *server)
500 {
501 int i;
502
503 spin_lock(&ses->chan_lock);
504 for (i = 0; i < ses->chan_count; i++) {
505 if (ses->chans[i].server == server) {
506 spin_unlock(&ses->chan_lock);
507 return &ses->chans[i];
508 }
509 }
510 spin_unlock(&ses->chan_lock);
511 return NULL;
512 }
513
514 static int
cifs_ses_add_channel(struct cifs_ses * ses,struct cifs_server_iface * iface)515 cifs_ses_add_channel(struct cifs_ses *ses,
516 struct cifs_server_iface *iface)
517 {
518 struct TCP_Server_Info *chan_server;
519 struct cifs_chan *chan;
520 struct smb3_fs_context *ctx;
521 static const char unc_fmt[] = "\\%s\\foo";
522 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;
523 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;
524 size_t len;
525 int rc;
526 unsigned int xid = get_xid();
527
528 if (iface->sockaddr.ss_family == AF_INET)
529 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI4)\n",
530 ses, iface->speed, iface->rdma_capable ? "yes" : "no",
531 &ipv4->sin_addr);
532 else
533 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI6)\n",
534 ses, iface->speed, iface->rdma_capable ? "yes" : "no",
535 &ipv6->sin6_addr);
536
537 /*
538 * Setup a ctx with mostly the same info as the existing
539 * session and overwrite it with the requested iface data.
540 *
541 * We need to setup at least the fields used for negprot and
542 * sesssetup.
543 *
544 * We only need the ctx here, so we can reuse memory from
545 * the session and server without caring about memory
546 * management.
547 */
548 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
549 if (!ctx) {
550 rc = -ENOMEM;
551 goto out_free_xid;
552 }
553
554 /* Always make new connection for now (TODO?) */
555 ctx->nosharesock = true;
556
557 /* Auth */
558 ctx->domainauto = ses->domainAuto;
559 ctx->domainname = ses->domainName;
560
561 ctx->server_hostname = ses->server->hostname;
562
563 ctx->username = ses->user_name;
564 ctx->password = ses->password;
565 ctx->sectype = ses->sectype;
566 ctx->sign = ses->sign;
567
568 /* UNC and paths */
569 /* XXX: Use ses->server->hostname? */
570 len = sizeof(unc_fmt) + SERVER_NAME_LEN_WITH_NULL;
571 ctx->UNC = kzalloc(len, GFP_KERNEL);
572 if (!ctx->UNC) {
573 rc = -ENOMEM;
574 goto out_free_ctx;
575 }
576 scnprintf(ctx->UNC, len, unc_fmt, ses->ip_addr);
577 ctx->prepath = "";
578
579 /* Reuse same version as master connection */
580 ctx->vals = ses->server->vals;
581 ctx->ops = ses->server->ops;
582
583 ctx->noblocksnd = ses->server->noblocksnd;
584 ctx->noautotune = ses->server->noautotune;
585 ctx->sockopt_tcp_nodelay = ses->server->tcp_nodelay;
586 ctx->echo_interval = ses->server->echo_interval / HZ;
587 ctx->max_credits = ses->server->max_credits;
588
589 /*
590 * This will be used for encoding/decoding user/domain/pw
591 * during sess setup auth.
592 */
593 ctx->local_nls = ses->local_nls;
594
595 /* Use RDMA if possible */
596 ctx->rdma = iface->rdma_capable;
597 memcpy(&ctx->dstaddr, &iface->sockaddr, sizeof(ctx->dstaddr));
598
599 /* reuse master con client guid */
600 memcpy(&ctx->client_guid, ses->server->client_guid,
601 sizeof(ctx->client_guid));
602 ctx->use_client_guid = true;
603
604 chan_server = cifs_get_tcp_session(ctx, ses->server);
605
606 spin_lock(&ses->chan_lock);
607 chan = &ses->chans[ses->chan_count];
608 chan->server = chan_server;
609 if (IS_ERR(chan->server)) {
610 rc = PTR_ERR(chan->server);
611 chan->server = NULL;
612 spin_unlock(&ses->chan_lock);
613 goto out;
614 }
615 chan->iface = iface;
616 ses->chan_count++;
617 atomic_set(&ses->chan_seq, 0);
618
619 /* Mark this channel as needing connect/setup */
620 cifs_chan_set_need_reconnect(ses, chan->server);
621
622 spin_unlock(&ses->chan_lock);
623
624 mutex_lock(&ses->session_mutex);
625 /*
626 * We need to allocate the server crypto now as we will need
627 * to sign packets before we generate the channel signing key
628 * (we sign with the session key)
629 */
630 rc = smb311_crypto_shash_allocate(chan->server);
631 if (rc) {
632 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
633 mutex_unlock(&ses->session_mutex);
634 goto out;
635 }
636
637 rc = cifs_negotiate_protocol(xid, ses, chan->server);
638 if (!rc)
639 rc = cifs_setup_session(xid, ses, chan->server, ses->local_nls);
640
641 mutex_unlock(&ses->session_mutex);
642
643 out:
644 if (rc && chan->server) {
645 cifs_put_tcp_session(chan->server, 0);
646
647 spin_lock(&ses->chan_lock);
648
649 /* we rely on all bits beyond chan_count to be clear */
650 cifs_chan_clear_need_reconnect(ses, chan->server);
651 ses->chan_count--;
652 /*
653 * chan_count should never reach 0 as at least the primary
654 * channel is always allocated
655 */
656 WARN_ON(ses->chan_count < 1);
657 spin_unlock(&ses->chan_lock);
658 }
659
660 kfree(ctx->UNC);
661 out_free_ctx:
662 kfree(ctx);
663 out_free_xid:
664 free_xid(xid);
665 return rc;
666 }
667
668 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
cifs_ssetup_hdr(struct cifs_ses * ses,struct TCP_Server_Info * server,SESSION_SETUP_ANDX * pSMB)669 static __u32 cifs_ssetup_hdr(struct cifs_ses *ses,
670 struct TCP_Server_Info *server,
671 SESSION_SETUP_ANDX *pSMB)
672 {
673 __u32 capabilities = 0;
674
675 /* init fields common to all four types of SessSetup */
676 /* Note that offsets for first seven fields in req struct are same */
677 /* in CIFS Specs so does not matter which of 3 forms of struct */
678 /* that we use in next few lines */
679 /* Note that header is initialized to zero in header_assemble */
680 pSMB->req.AndXCommand = 0xFF;
681 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
682 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
683 USHRT_MAX));
684 pSMB->req.MaxMpxCount = cpu_to_le16(server->maxReq);
685 pSMB->req.VcNumber = cpu_to_le16(1);
686
687 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
688
689 /* BB verify whether signing required on neg or just auth frame (and NTLM case) */
690
691 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
692 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
693
694 if (server->sign)
695 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
696
697 if (ses->capabilities & CAP_UNICODE) {
698 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
699 capabilities |= CAP_UNICODE;
700 }
701 if (ses->capabilities & CAP_STATUS32) {
702 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
703 capabilities |= CAP_STATUS32;
704 }
705 if (ses->capabilities & CAP_DFS) {
706 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
707 capabilities |= CAP_DFS;
708 }
709 if (ses->capabilities & CAP_UNIX)
710 capabilities |= CAP_UNIX;
711
712 return capabilities;
713 }
714
715 static void
unicode_oslm_strings(char ** pbcc_area,const struct nls_table * nls_cp)716 unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
717 {
718 char *bcc_ptr = *pbcc_area;
719 int bytes_ret = 0;
720
721 /* Copy OS version */
722 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
723 nls_cp);
724 bcc_ptr += 2 * bytes_ret;
725 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
726 32, nls_cp);
727 bcc_ptr += 2 * bytes_ret;
728 bcc_ptr += 2; /* trailing null */
729
730 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
731 32, nls_cp);
732 bcc_ptr += 2 * bytes_ret;
733 bcc_ptr += 2; /* trailing null */
734
735 *pbcc_area = bcc_ptr;
736 }
737
738 static void
ascii_oslm_strings(char ** pbcc_area,const struct nls_table * nls_cp)739 ascii_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
740 {
741 char *bcc_ptr = *pbcc_area;
742
743 strcpy(bcc_ptr, "Linux version ");
744 bcc_ptr += strlen("Linux version ");
745 strcpy(bcc_ptr, init_utsname()->release);
746 bcc_ptr += strlen(init_utsname()->release) + 1;
747
748 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
749 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
750
751 *pbcc_area = bcc_ptr;
752 }
753
unicode_domain_string(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)754 static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
755 const struct nls_table *nls_cp)
756 {
757 char *bcc_ptr = *pbcc_area;
758 int bytes_ret = 0;
759
760 /* copy domain */
761 if (ses->domainName == NULL) {
762 /*
763 * Sending null domain better than using a bogus domain name (as
764 * we did briefly in 2.6.18) since server will use its default
765 */
766 *bcc_ptr = 0;
767 *(bcc_ptr+1) = 0;
768 bytes_ret = 0;
769 } else
770 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
771 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
772 bcc_ptr += 2 * bytes_ret;
773 bcc_ptr += 2; /* account for null terminator */
774
775 *pbcc_area = bcc_ptr;
776 }
777
ascii_domain_string(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)778 static void ascii_domain_string(char **pbcc_area, struct cifs_ses *ses,
779 const struct nls_table *nls_cp)
780 {
781 char *bcc_ptr = *pbcc_area;
782 int len;
783
784 /* copy domain */
785 if (ses->domainName != NULL) {
786 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
787 if (WARN_ON_ONCE(len < 0))
788 len = CIFS_MAX_DOMAINNAME_LEN - 1;
789 bcc_ptr += len;
790 } /* else we send a null domain name so server will default to its own domain */
791 *bcc_ptr = 0;
792 bcc_ptr++;
793
794 *pbcc_area = bcc_ptr;
795 }
796
unicode_ssetup_strings(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)797 static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
798 const struct nls_table *nls_cp)
799 {
800 char *bcc_ptr = *pbcc_area;
801 int bytes_ret = 0;
802
803 /* BB FIXME add check that strings less than 335 or will need to send as arrays */
804
805 /* copy user */
806 if (ses->user_name == NULL) {
807 /* null user mount */
808 *bcc_ptr = 0;
809 *(bcc_ptr+1) = 0;
810 } else {
811 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
812 CIFS_MAX_USERNAME_LEN, nls_cp);
813 }
814 bcc_ptr += 2 * bytes_ret;
815 bcc_ptr += 2; /* account for null termination */
816
817 unicode_domain_string(&bcc_ptr, ses, nls_cp);
818 unicode_oslm_strings(&bcc_ptr, nls_cp);
819
820 *pbcc_area = bcc_ptr;
821 }
822
ascii_ssetup_strings(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)823 static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
824 const struct nls_table *nls_cp)
825 {
826 char *bcc_ptr = *pbcc_area;
827 int len;
828
829 /* copy user */
830 /* BB what about null user mounts - check that we do this BB */
831 /* copy user */
832 if (ses->user_name != NULL) {
833 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
834 if (WARN_ON_ONCE(len < 0))
835 len = CIFS_MAX_USERNAME_LEN - 1;
836 bcc_ptr += len;
837 }
838 /* else null user mount */
839 *bcc_ptr = 0;
840 bcc_ptr++; /* account for null termination */
841
842 /* BB check for overflow here */
843
844 ascii_domain_string(&bcc_ptr, ses, nls_cp);
845 ascii_oslm_strings(&bcc_ptr, nls_cp);
846
847 *pbcc_area = bcc_ptr;
848 }
849
850 static void
decode_unicode_ssetup(char ** pbcc_area,int bleft,struct cifs_ses * ses,const struct nls_table * nls_cp)851 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
852 const struct nls_table *nls_cp)
853 {
854 int len;
855 char *data = *pbcc_area;
856
857 cifs_dbg(FYI, "bleft %d\n", bleft);
858
859 kfree(ses->serverOS);
860 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
861 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
862 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
863 data += len;
864 bleft -= len;
865 if (bleft <= 0)
866 return;
867
868 kfree(ses->serverNOS);
869 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
870 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
871 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
872 data += len;
873 bleft -= len;
874 if (bleft <= 0)
875 return;
876
877 kfree(ses->serverDomain);
878 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
879 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
880
881 return;
882 }
883
decode_ascii_ssetup(char ** pbcc_area,__u16 bleft,struct cifs_ses * ses,const struct nls_table * nls_cp)884 static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
885 struct cifs_ses *ses,
886 const struct nls_table *nls_cp)
887 {
888 int len;
889 char *bcc_ptr = *pbcc_area;
890
891 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
892
893 len = strnlen(bcc_ptr, bleft);
894 if (len >= bleft)
895 return;
896
897 kfree(ses->serverOS);
898
899 ses->serverOS = kmalloc(len + 1, GFP_KERNEL);
900 if (ses->serverOS) {
901 memcpy(ses->serverOS, bcc_ptr, len);
902 ses->serverOS[len] = 0;
903 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
904 cifs_dbg(FYI, "OS/2 server\n");
905 }
906
907 bcc_ptr += len + 1;
908 bleft -= len + 1;
909
910 len = strnlen(bcc_ptr, bleft);
911 if (len >= bleft)
912 return;
913
914 kfree(ses->serverNOS);
915
916 ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);
917 if (ses->serverNOS) {
918 memcpy(ses->serverNOS, bcc_ptr, len);
919 ses->serverNOS[len] = 0;
920 }
921
922 bcc_ptr += len + 1;
923 bleft -= len + 1;
924
925 len = strnlen(bcc_ptr, bleft);
926 if (len > bleft)
927 return;
928
929 /*
930 * No domain field in LANMAN case. Domain is
931 * returned by old servers in the SMB negprot response
932 *
933 * BB For newer servers which do not support Unicode,
934 * but thus do return domain here, we could add parsing
935 * for it later, but it is not very important
936 */
937 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
938 }
939 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
940
decode_ntlmssp_challenge(char * bcc_ptr,int blob_len,struct cifs_ses * ses)941 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
942 struct cifs_ses *ses)
943 {
944 unsigned int tioffset; /* challenge message target info area */
945 unsigned int tilen; /* challenge message target info area length */
946 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
947 __u32 server_flags;
948
949 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
950 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
951 return -EINVAL;
952 }
953
954 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
955 cifs_dbg(VFS, "blob signature incorrect %s\n",
956 pblob->Signature);
957 return -EINVAL;
958 }
959 if (pblob->MessageType != NtLmChallenge) {
960 cifs_dbg(VFS, "Incorrect message type %d\n",
961 pblob->MessageType);
962 return -EINVAL;
963 }
964
965 server_flags = le32_to_cpu(pblob->NegotiateFlags);
966 cifs_dbg(FYI, "%s: negotiate=0x%08x challenge=0x%08x\n", __func__,
967 ses->ntlmssp->client_flags, server_flags);
968
969 if ((ses->ntlmssp->client_flags & (NTLMSSP_NEGOTIATE_SEAL | NTLMSSP_NEGOTIATE_SIGN)) &&
970 (!(server_flags & NTLMSSP_NEGOTIATE_56) && !(server_flags & NTLMSSP_NEGOTIATE_128))) {
971 cifs_dbg(VFS, "%s: requested signing/encryption but server did not return either 56-bit or 128-bit session key size\n",
972 __func__);
973 return -EINVAL;
974 }
975 if (!(server_flags & NTLMSSP_NEGOTIATE_NTLM) && !(server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) {
976 cifs_dbg(VFS, "%s: server does not seem to support either NTLMv1 or NTLMv2\n", __func__);
977 return -EINVAL;
978 }
979 if (ses->server->sign && !(server_flags & NTLMSSP_NEGOTIATE_SIGN)) {
980 cifs_dbg(VFS, "%s: forced packet signing but server does not seem to support it\n",
981 __func__);
982 return -EOPNOTSUPP;
983 }
984 if ((ses->ntlmssp->client_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
985 !(server_flags & NTLMSSP_NEGOTIATE_KEY_XCH))
986 pr_warn_once("%s: authentication has been weakened as server does not support key exchange\n",
987 __func__);
988
989 ses->ntlmssp->server_flags = server_flags;
990
991 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
992 /*
993 * In particular we can examine sign flags
994 *
995 * BB spec says that if AvId field of MsvAvTimestamp is populated then
996 * we must set the MIC field of the AUTHENTICATE_MESSAGE
997 */
998
999 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
1000 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
1001 if (tioffset > blob_len || tioffset + tilen > blob_len) {
1002 cifs_dbg(VFS, "tioffset + tilen too high %u + %u\n",
1003 tioffset, tilen);
1004 return -EINVAL;
1005 }
1006 if (tilen) {
1007 kfree_sensitive(ses->auth_key.response);
1008 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
1009 GFP_KERNEL);
1010 if (!ses->auth_key.response) {
1011 cifs_dbg(VFS, "Challenge target info alloc failure\n");
1012 return -ENOMEM;
1013 }
1014 ses->auth_key.len = tilen;
1015 }
1016
1017 return 0;
1018 }
1019
size_of_ntlmssp_blob(struct cifs_ses * ses,int base_size)1020 static int size_of_ntlmssp_blob(struct cifs_ses *ses, int base_size)
1021 {
1022 int sz = base_size + ses->auth_key.len
1023 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
1024
1025 if (ses->domainName)
1026 sz += sizeof(__le16) * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
1027 else
1028 sz += sizeof(__le16);
1029
1030 if (ses->user_name)
1031 sz += sizeof(__le16) * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
1032 else
1033 sz += sizeof(__le16);
1034
1035 if (ses->workstation_name[0])
1036 sz += sizeof(__le16) * strnlen(ses->workstation_name,
1037 ntlmssp_workstation_name_size(ses));
1038 else
1039 sz += sizeof(__le16);
1040
1041 return sz;
1042 }
1043
cifs_security_buffer_from_str(SECURITY_BUFFER * pbuf,char * str_value,int str_length,unsigned char * pstart,unsigned char ** pcur,const struct nls_table * nls_cp)1044 static inline void cifs_security_buffer_from_str(SECURITY_BUFFER *pbuf,
1045 char *str_value,
1046 int str_length,
1047 unsigned char *pstart,
1048 unsigned char **pcur,
1049 const struct nls_table *nls_cp)
1050 {
1051 unsigned char *tmp = pstart;
1052 int len;
1053
1054 if (!pbuf)
1055 return;
1056
1057 if (!pcur)
1058 pcur = &tmp;
1059
1060 if (!str_value) {
1061 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
1062 pbuf->Length = 0;
1063 pbuf->MaximumLength = 0;
1064 *pcur += sizeof(__le16);
1065 } else {
1066 len = cifs_strtoUTF16((__le16 *)*pcur,
1067 str_value,
1068 str_length,
1069 nls_cp);
1070 len *= sizeof(__le16);
1071 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
1072 pbuf->Length = cpu_to_le16(len);
1073 pbuf->MaximumLength = cpu_to_le16(len);
1074 *pcur += len;
1075 }
1076 }
1077
1078 /* BB Move to ntlmssp.c eventually */
1079
build_ntlmssp_negotiate_blob(unsigned char ** pbuffer,u16 * buflen,struct cifs_ses * ses,struct TCP_Server_Info * server,const struct nls_table * nls_cp)1080 int build_ntlmssp_negotiate_blob(unsigned char **pbuffer,
1081 u16 *buflen,
1082 struct cifs_ses *ses,
1083 struct TCP_Server_Info *server,
1084 const struct nls_table *nls_cp)
1085 {
1086 int rc = 0;
1087 NEGOTIATE_MESSAGE *sec_blob;
1088 __u32 flags;
1089 unsigned char *tmp;
1090 int len;
1091
1092 len = size_of_ntlmssp_blob(ses, sizeof(NEGOTIATE_MESSAGE));
1093 *pbuffer = kmalloc(len, GFP_KERNEL);
1094 if (!*pbuffer) {
1095 rc = -ENOMEM;
1096 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
1097 *buflen = 0;
1098 goto setup_ntlm_neg_ret;
1099 }
1100 sec_blob = (NEGOTIATE_MESSAGE *)*pbuffer;
1101
1102 memset(*pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
1103 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
1104 sec_blob->MessageType = NtLmNegotiate;
1105
1106 /* BB is NTLMV2 session security format easier to use here? */
1107 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
1108 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
1109 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
1110 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
1111 NTLMSSP_NEGOTIATE_SIGN;
1112 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
1113 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
1114
1115 tmp = *pbuffer + sizeof(NEGOTIATE_MESSAGE);
1116 ses->ntlmssp->client_flags = flags;
1117 sec_blob->NegotiateFlags = cpu_to_le32(flags);
1118
1119 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
1120 cifs_security_buffer_from_str(&sec_blob->DomainName,
1121 NULL,
1122 CIFS_MAX_DOMAINNAME_LEN,
1123 *pbuffer, &tmp,
1124 nls_cp);
1125
1126 cifs_security_buffer_from_str(&sec_blob->WorkstationName,
1127 NULL,
1128 CIFS_MAX_WORKSTATION_LEN,
1129 *pbuffer, &tmp,
1130 nls_cp);
1131
1132 *buflen = tmp - *pbuffer;
1133 setup_ntlm_neg_ret:
1134 return rc;
1135 }
1136
1137 /*
1138 * Build ntlmssp blob with additional fields, such as version,
1139 * supported by modern servers. For safety limit to SMB3 or later
1140 * See notes in MS-NLMP Section 2.2.2.1 e.g.
1141 */
build_ntlmssp_smb3_negotiate_blob(unsigned char ** pbuffer,u16 * buflen,struct cifs_ses * ses,struct TCP_Server_Info * server,const struct nls_table * nls_cp)1142 int build_ntlmssp_smb3_negotiate_blob(unsigned char **pbuffer,
1143 u16 *buflen,
1144 struct cifs_ses *ses,
1145 struct TCP_Server_Info *server,
1146 const struct nls_table *nls_cp)
1147 {
1148 int rc = 0;
1149 struct negotiate_message *sec_blob;
1150 __u32 flags;
1151 unsigned char *tmp;
1152 int len;
1153
1154 len = size_of_ntlmssp_blob(ses, sizeof(struct negotiate_message));
1155 *pbuffer = kmalloc(len, GFP_KERNEL);
1156 if (!*pbuffer) {
1157 rc = -ENOMEM;
1158 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
1159 *buflen = 0;
1160 goto setup_ntlm_smb3_neg_ret;
1161 }
1162 sec_blob = (struct negotiate_message *)*pbuffer;
1163
1164 memset(*pbuffer, 0, sizeof(struct negotiate_message));
1165 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
1166 sec_blob->MessageType = NtLmNegotiate;
1167
1168 /* BB is NTLMV2 session security format easier to use here? */
1169 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
1170 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
1171 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
1172 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
1173 NTLMSSP_NEGOTIATE_SIGN | NTLMSSP_NEGOTIATE_VERSION;
1174 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
1175 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
1176
1177 sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR;
1178 sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL;
1179 sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD);
1180 sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
1181
1182 tmp = *pbuffer + sizeof(struct negotiate_message);
1183 ses->ntlmssp->client_flags = flags;
1184 sec_blob->NegotiateFlags = cpu_to_le32(flags);
1185
1186 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
1187 cifs_security_buffer_from_str(&sec_blob->DomainName,
1188 NULL,
1189 CIFS_MAX_DOMAINNAME_LEN,
1190 *pbuffer, &tmp,
1191 nls_cp);
1192
1193 cifs_security_buffer_from_str(&sec_blob->WorkstationName,
1194 NULL,
1195 CIFS_MAX_WORKSTATION_LEN,
1196 *pbuffer, &tmp,
1197 nls_cp);
1198
1199 *buflen = tmp - *pbuffer;
1200 setup_ntlm_smb3_neg_ret:
1201 return rc;
1202 }
1203
1204
1205 /* See MS-NLMP 2.2.1.3 */
build_ntlmssp_auth_blob(unsigned char ** pbuffer,u16 * buflen,struct cifs_ses * ses,struct TCP_Server_Info * server,const struct nls_table * nls_cp)1206 int build_ntlmssp_auth_blob(unsigned char **pbuffer,
1207 u16 *buflen,
1208 struct cifs_ses *ses,
1209 struct TCP_Server_Info *server,
1210 const struct nls_table *nls_cp)
1211 {
1212 int rc;
1213 AUTHENTICATE_MESSAGE *sec_blob;
1214 __u32 flags;
1215 unsigned char *tmp;
1216 int len;
1217
1218 rc = setup_ntlmv2_rsp(ses, nls_cp);
1219 if (rc) {
1220 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
1221 *buflen = 0;
1222 goto setup_ntlmv2_ret;
1223 }
1224
1225 len = size_of_ntlmssp_blob(ses, sizeof(AUTHENTICATE_MESSAGE));
1226 *pbuffer = kmalloc(len, GFP_KERNEL);
1227 if (!*pbuffer) {
1228 rc = -ENOMEM;
1229 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
1230 *buflen = 0;
1231 goto setup_ntlmv2_ret;
1232 }
1233 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
1234
1235 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
1236 sec_blob->MessageType = NtLmAuthenticate;
1237
1238 /* send version information in ntlmssp authenticate also */
1239 flags = ses->ntlmssp->server_flags | NTLMSSP_REQUEST_TARGET |
1240 NTLMSSP_NEGOTIATE_TARGET_INFO | NTLMSSP_NEGOTIATE_VERSION |
1241 NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED;
1242
1243 sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR;
1244 sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL;
1245 sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD);
1246 sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
1247
1248 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
1249 sec_blob->NegotiateFlags = cpu_to_le32(flags);
1250
1251 sec_blob->LmChallengeResponse.BufferOffset =
1252 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
1253 sec_blob->LmChallengeResponse.Length = 0;
1254 sec_blob->LmChallengeResponse.MaximumLength = 0;
1255
1256 sec_blob->NtChallengeResponse.BufferOffset =
1257 cpu_to_le32(tmp - *pbuffer);
1258 if (ses->user_name != NULL) {
1259 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1260 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1261 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1262
1263 sec_blob->NtChallengeResponse.Length =
1264 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1265 sec_blob->NtChallengeResponse.MaximumLength =
1266 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1267 } else {
1268 /*
1269 * don't send an NT Response for anonymous access
1270 */
1271 sec_blob->NtChallengeResponse.Length = 0;
1272 sec_blob->NtChallengeResponse.MaximumLength = 0;
1273 }
1274
1275 cifs_security_buffer_from_str(&sec_blob->DomainName,
1276 ses->domainName,
1277 CIFS_MAX_DOMAINNAME_LEN,
1278 *pbuffer, &tmp,
1279 nls_cp);
1280
1281 cifs_security_buffer_from_str(&sec_blob->UserName,
1282 ses->user_name,
1283 CIFS_MAX_USERNAME_LEN,
1284 *pbuffer, &tmp,
1285 nls_cp);
1286
1287 cifs_security_buffer_from_str(&sec_blob->WorkstationName,
1288 ses->workstation_name,
1289 ntlmssp_workstation_name_size(ses),
1290 *pbuffer, &tmp,
1291 nls_cp);
1292
1293 if ((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
1294 (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess) &&
1295 !calc_seckey(ses)) {
1296 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
1297 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
1298 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
1299 sec_blob->SessionKey.MaximumLength =
1300 cpu_to_le16(CIFS_CPHTXT_SIZE);
1301 tmp += CIFS_CPHTXT_SIZE;
1302 } else {
1303 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
1304 sec_blob->SessionKey.Length = 0;
1305 sec_blob->SessionKey.MaximumLength = 0;
1306 }
1307
1308 *buflen = tmp - *pbuffer;
1309 setup_ntlmv2_ret:
1310 return rc;
1311 }
1312
1313 enum securityEnum
cifs_select_sectype(struct TCP_Server_Info * server,enum securityEnum requested)1314 cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1315 {
1316 switch (server->negflavor) {
1317 case CIFS_NEGFLAVOR_EXTENDED:
1318 switch (requested) {
1319 case Kerberos:
1320 case RawNTLMSSP:
1321 case IAKerb:
1322 return requested;
1323 case Unspecified:
1324 if (server->sec_ntlmssp &&
1325 (global_secflags & CIFSSEC_MAY_NTLMSSP))
1326 return RawNTLMSSP;
1327 if ((server->sec_kerberos || server->sec_mskerberos || server->sec_iakerb) &&
1328 (global_secflags & CIFSSEC_MAY_KRB5))
1329 return Kerberos;
1330 fallthrough;
1331 default:
1332 return Unspecified;
1333 }
1334 case CIFS_NEGFLAVOR_UNENCAP:
1335 switch (requested) {
1336 case NTLMv2:
1337 return requested;
1338 case Unspecified:
1339 if (global_secflags & CIFSSEC_MAY_NTLMV2)
1340 return NTLMv2;
1341 break;
1342 default:
1343 break;
1344 }
1345 fallthrough;
1346 default:
1347 return Unspecified;
1348 }
1349 }
1350
1351 struct sess_data {
1352 unsigned int xid;
1353 struct cifs_ses *ses;
1354 struct TCP_Server_Info *server;
1355 struct nls_table *nls_cp;
1356 void (*func)(struct sess_data *);
1357 int result;
1358
1359 /* we will send the SMB in three pieces:
1360 * a fixed length beginning part, an optional
1361 * SPNEGO blob (which can be zero length), and a
1362 * last part which will include the strings
1363 * and rest of bcc area. This allows us to avoid
1364 * a large buffer 17K allocation
1365 */
1366 int buf0_type;
1367 struct kvec iov[3];
1368 };
1369
1370 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1371 static int
sess_alloc_buffer(struct sess_data * sess_data,int wct)1372 sess_alloc_buffer(struct sess_data *sess_data, int wct)
1373 {
1374 int rc;
1375 struct cifs_ses *ses = sess_data->ses;
1376 struct smb_hdr *smb_buf;
1377
1378 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
1379 (void **)&smb_buf);
1380
1381 if (rc)
1382 return rc;
1383
1384 sess_data->iov[0].iov_base = (char *)smb_buf;
1385 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
1386 /*
1387 * This variable will be used to clear the buffer
1388 * allocated above in case of any error in the calling function.
1389 */
1390 sess_data->buf0_type = CIFS_SMALL_BUFFER;
1391
1392 /* 2000 big enough to fit max user, domain, NOS name etc. */
1393 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
1394 if (!sess_data->iov[2].iov_base) {
1395 rc = -ENOMEM;
1396 goto out_free_smb_buf;
1397 }
1398
1399 return 0;
1400
1401 out_free_smb_buf:
1402 cifs_small_buf_release(smb_buf);
1403 sess_data->iov[0].iov_base = NULL;
1404 sess_data->iov[0].iov_len = 0;
1405 sess_data->buf0_type = CIFS_NO_BUFFER;
1406 return rc;
1407 }
1408
1409 static void
sess_free_buffer(struct sess_data * sess_data)1410 sess_free_buffer(struct sess_data *sess_data)
1411 {
1412 struct kvec *iov = sess_data->iov;
1413
1414 /*
1415 * Zero the session data before freeing, as it might contain sensitive info (keys, etc).
1416 * Note that iov[1] is already freed by caller.
1417 */
1418 if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
1419 memzero_explicit(iov[0].iov_base, iov[0].iov_len);
1420
1421 free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
1422 sess_data->buf0_type = CIFS_NO_BUFFER;
1423 kfree_sensitive(iov[2].iov_base);
1424 }
1425
1426 static int
sess_establish_session(struct sess_data * sess_data)1427 sess_establish_session(struct sess_data *sess_data)
1428 {
1429 struct cifs_ses *ses = sess_data->ses;
1430 struct TCP_Server_Info *server = sess_data->server;
1431
1432 cifs_server_lock(server);
1433 if (!server->session_estab) {
1434 if (server->sign) {
1435 server->session_key.response =
1436 kmemdup(ses->auth_key.response,
1437 ses->auth_key.len, GFP_KERNEL);
1438 if (!server->session_key.response) {
1439 cifs_server_unlock(server);
1440 return -ENOMEM;
1441 }
1442 server->session_key.len =
1443 ses->auth_key.len;
1444 }
1445 server->sequence_number = 0x2;
1446 server->session_estab = true;
1447 }
1448 cifs_server_unlock(server);
1449
1450 cifs_dbg(FYI, "CIFS session established successfully\n");
1451 return 0;
1452 }
1453
1454 static int
sess_sendreceive(struct sess_data * sess_data)1455 sess_sendreceive(struct sess_data *sess_data)
1456 {
1457 int rc;
1458 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
1459 __u16 count;
1460 struct kvec rsp_iov = { NULL, 0 };
1461
1462 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
1463 be32_add_cpu(&smb_buf->smb_buf_length, count);
1464 put_bcc(count, smb_buf);
1465
1466 rc = SendReceive2(sess_data->xid, sess_data->ses,
1467 sess_data->iov, 3 /* num_iovecs */,
1468 &sess_data->buf0_type,
1469 CIFS_LOG_ERROR, &rsp_iov);
1470 cifs_small_buf_release(sess_data->iov[0].iov_base);
1471 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1472
1473 return rc;
1474 }
1475
1476 static void
sess_auth_ntlmv2(struct sess_data * sess_data)1477 sess_auth_ntlmv2(struct sess_data *sess_data)
1478 {
1479 int rc = 0;
1480 struct smb_hdr *smb_buf;
1481 SESSION_SETUP_ANDX *pSMB;
1482 char *bcc_ptr;
1483 struct cifs_ses *ses = sess_data->ses;
1484 struct TCP_Server_Info *server = sess_data->server;
1485 __u32 capabilities;
1486 __u16 bytes_remaining;
1487
1488 /* old style NTLM sessionsetup */
1489 /* wct = 13 */
1490 rc = sess_alloc_buffer(sess_data, 13);
1491 if (rc)
1492 goto out;
1493
1494 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1495 bcc_ptr = sess_data->iov[2].iov_base;
1496 capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1497
1498 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
1499
1500 /* LM2 password would be here if we supported it */
1501 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
1502
1503 if (ses->user_name != NULL) {
1504 /* calculate nlmv2 response and session key */
1505 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
1506 if (rc) {
1507 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
1508 goto out;
1509 }
1510
1511 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1512 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1513 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1514
1515 /* set case sensitive password length after tilen may get
1516 * assigned, tilen is 0 otherwise.
1517 */
1518 pSMB->req_no_secext.CaseSensitivePasswordLength =
1519 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1520 } else {
1521 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
1522 }
1523
1524 if (ses->capabilities & CAP_UNICODE) {
1525 if (!IS_ALIGNED(sess_data->iov[0].iov_len, 2)) {
1526 *bcc_ptr = 0;
1527 bcc_ptr++;
1528 }
1529 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1530 } else {
1531 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1532 }
1533
1534
1535 sess_data->iov[2].iov_len = (long) bcc_ptr -
1536 (long) sess_data->iov[2].iov_base;
1537
1538 rc = sess_sendreceive(sess_data);
1539 if (rc)
1540 goto out;
1541
1542 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1543 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1544
1545 if (smb_buf->WordCount != 3) {
1546 rc = -EIO;
1547 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1548 goto out;
1549 }
1550
1551 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1552 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1553
1554 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1555 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1556
1557 bytes_remaining = get_bcc(smb_buf);
1558 bcc_ptr = pByteArea(smb_buf);
1559
1560 /* BB check if Unicode and decode strings */
1561 if (bytes_remaining == 0) {
1562 /* no string area to decode, do nothing */
1563 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1564 /* unicode string area must be word-aligned */
1565 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1566 ++bcc_ptr;
1567 --bytes_remaining;
1568 }
1569 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1570 sess_data->nls_cp);
1571 } else {
1572 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1573 sess_data->nls_cp);
1574 }
1575
1576 rc = sess_establish_session(sess_data);
1577 out:
1578 sess_data->result = rc;
1579 sess_data->func = NULL;
1580 sess_free_buffer(sess_data);
1581 kfree_sensitive(ses->auth_key.response);
1582 ses->auth_key.response = NULL;
1583 }
1584
1585 #ifdef CONFIG_CIFS_UPCALL
1586 static void
sess_auth_kerberos(struct sess_data * sess_data)1587 sess_auth_kerberos(struct sess_data *sess_data)
1588 {
1589 int rc = 0;
1590 struct smb_hdr *smb_buf;
1591 SESSION_SETUP_ANDX *pSMB;
1592 char *bcc_ptr;
1593 struct cifs_ses *ses = sess_data->ses;
1594 struct TCP_Server_Info *server = sess_data->server;
1595 __u32 capabilities;
1596 __u16 bytes_remaining;
1597 struct key *spnego_key = NULL;
1598 struct cifs_spnego_msg *msg;
1599 u16 blob_len;
1600
1601 /* extended security */
1602 /* wct = 12 */
1603 rc = sess_alloc_buffer(sess_data, 12);
1604 if (rc)
1605 goto out;
1606
1607 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1608 bcc_ptr = sess_data->iov[2].iov_base;
1609 capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1610
1611 spnego_key = cifs_get_spnego_key(ses, server);
1612 if (IS_ERR(spnego_key)) {
1613 rc = PTR_ERR(spnego_key);
1614 spnego_key = NULL;
1615 goto out;
1616 }
1617
1618 msg = spnego_key->payload.data[0];
1619 /*
1620 * check version field to make sure that cifs.upcall is
1621 * sending us a response in an expected form
1622 */
1623 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1624 cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n",
1625 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1626 rc = -EKEYREJECTED;
1627 goto out_put_spnego_key;
1628 }
1629
1630 kfree_sensitive(ses->auth_key.response);
1631 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1632 GFP_KERNEL);
1633 if (!ses->auth_key.response) {
1634 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1635 msg->sesskey_len);
1636 rc = -ENOMEM;
1637 goto out_put_spnego_key;
1638 }
1639 ses->auth_key.len = msg->sesskey_len;
1640
1641 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1642 capabilities |= CAP_EXTENDED_SECURITY;
1643 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1644 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1645 sess_data->iov[1].iov_len = msg->secblob_len;
1646 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1647
1648 if (pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) {
1649 /* unicode strings must be word aligned */
1650 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
1651 *bcc_ptr = 0;
1652 bcc_ptr++;
1653 }
1654 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1655 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1656 } else {
1657 ascii_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1658 ascii_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1659 }
1660
1661 sess_data->iov[2].iov_len = (long) bcc_ptr -
1662 (long) sess_data->iov[2].iov_base;
1663
1664 rc = sess_sendreceive(sess_data);
1665 if (rc)
1666 goto out_put_spnego_key;
1667
1668 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1669 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1670
1671 if (smb_buf->WordCount != 4) {
1672 rc = -EIO;
1673 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1674 goto out_put_spnego_key;
1675 }
1676
1677 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1678 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1679
1680 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1681 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1682
1683 bytes_remaining = get_bcc(smb_buf);
1684 bcc_ptr = pByteArea(smb_buf);
1685
1686 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1687 if (blob_len > bytes_remaining) {
1688 cifs_dbg(VFS, "bad security blob length %d\n",
1689 blob_len);
1690 rc = -EINVAL;
1691 goto out_put_spnego_key;
1692 }
1693 bcc_ptr += blob_len;
1694 bytes_remaining -= blob_len;
1695
1696 /* BB check if Unicode and decode strings */
1697 if (bytes_remaining == 0) {
1698 /* no string area to decode, do nothing */
1699 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1700 /* unicode string area must be word-aligned */
1701 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1702 ++bcc_ptr;
1703 --bytes_remaining;
1704 }
1705 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1706 sess_data->nls_cp);
1707 } else {
1708 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1709 sess_data->nls_cp);
1710 }
1711
1712 rc = sess_establish_session(sess_data);
1713 out_put_spnego_key:
1714 key_invalidate(spnego_key);
1715 key_put(spnego_key);
1716 out:
1717 sess_data->result = rc;
1718 sess_data->func = NULL;
1719 sess_free_buffer(sess_data);
1720 kfree_sensitive(ses->auth_key.response);
1721 ses->auth_key.response = NULL;
1722 }
1723
1724 #endif /* ! CONFIG_CIFS_UPCALL */
1725
1726 /*
1727 * The required kvec buffers have to be allocated before calling this
1728 * function.
1729 */
1730 static int
_sess_auth_rawntlmssp_assemble_req(struct sess_data * sess_data)1731 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1732 {
1733 SESSION_SETUP_ANDX *pSMB;
1734 struct cifs_ses *ses = sess_data->ses;
1735 struct TCP_Server_Info *server = sess_data->server;
1736 __u32 capabilities;
1737 char *bcc_ptr;
1738
1739 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1740
1741 capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1742 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1743 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1744 return -ENOSYS;
1745 }
1746
1747 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1748 capabilities |= CAP_EXTENDED_SECURITY;
1749 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1750
1751 bcc_ptr = sess_data->iov[2].iov_base;
1752 /* unicode strings must be word aligned */
1753 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
1754 *bcc_ptr = 0;
1755 bcc_ptr++;
1756 }
1757 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1758
1759 sess_data->iov[2].iov_len = (long) bcc_ptr -
1760 (long) sess_data->iov[2].iov_base;
1761
1762 return 0;
1763 }
1764
1765 static void
1766 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1767
1768 static void
sess_auth_rawntlmssp_negotiate(struct sess_data * sess_data)1769 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1770 {
1771 int rc;
1772 struct smb_hdr *smb_buf;
1773 SESSION_SETUP_ANDX *pSMB;
1774 struct cifs_ses *ses = sess_data->ses;
1775 struct TCP_Server_Info *server = sess_data->server;
1776 __u16 bytes_remaining;
1777 char *bcc_ptr;
1778 unsigned char *ntlmsspblob = NULL;
1779 u16 blob_len;
1780
1781 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1782
1783 /*
1784 * if memory allocation is successful, caller of this function
1785 * frees it.
1786 */
1787 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1788 if (!ses->ntlmssp) {
1789 rc = -ENOMEM;
1790 goto out;
1791 }
1792 ses->ntlmssp->sesskey_per_smbsess = false;
1793
1794 /* wct = 12 */
1795 rc = sess_alloc_buffer(sess_data, 12);
1796 if (rc)
1797 goto out;
1798
1799 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1800
1801 /* Build security blob before we assemble the request */
1802 rc = build_ntlmssp_negotiate_blob(&ntlmsspblob,
1803 &blob_len, ses, server,
1804 sess_data->nls_cp);
1805 if (rc)
1806 goto out_free_ntlmsspblob;
1807
1808 sess_data->iov[1].iov_len = blob_len;
1809 sess_data->iov[1].iov_base = ntlmsspblob;
1810 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1811
1812 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1813 if (rc)
1814 goto out_free_ntlmsspblob;
1815
1816 rc = sess_sendreceive(sess_data);
1817
1818 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1819 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1820
1821 /* If true, rc here is expected and not an error */
1822 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1823 smb_buf->Status.CifsError ==
1824 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1825 rc = 0;
1826
1827 if (rc)
1828 goto out_free_ntlmsspblob;
1829
1830 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1831
1832 if (smb_buf->WordCount != 4) {
1833 rc = -EIO;
1834 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1835 goto out_free_ntlmsspblob;
1836 }
1837
1838 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1839 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1840
1841 bytes_remaining = get_bcc(smb_buf);
1842 bcc_ptr = pByteArea(smb_buf);
1843
1844 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1845 if (blob_len > bytes_remaining) {
1846 cifs_dbg(VFS, "bad security blob length %d\n",
1847 blob_len);
1848 rc = -EINVAL;
1849 goto out_free_ntlmsspblob;
1850 }
1851
1852 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1853
1854 out_free_ntlmsspblob:
1855 kfree_sensitive(ntlmsspblob);
1856 out:
1857 sess_free_buffer(sess_data);
1858
1859 if (!rc) {
1860 sess_data->func = sess_auth_rawntlmssp_authenticate;
1861 return;
1862 }
1863
1864 /* Else error. Cleanup */
1865 kfree_sensitive(ses->auth_key.response);
1866 ses->auth_key.response = NULL;
1867 kfree_sensitive(ses->ntlmssp);
1868 ses->ntlmssp = NULL;
1869
1870 sess_data->func = NULL;
1871 sess_data->result = rc;
1872 }
1873
1874 static void
sess_auth_rawntlmssp_authenticate(struct sess_data * sess_data)1875 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1876 {
1877 int rc;
1878 struct smb_hdr *smb_buf;
1879 SESSION_SETUP_ANDX *pSMB;
1880 struct cifs_ses *ses = sess_data->ses;
1881 struct TCP_Server_Info *server = sess_data->server;
1882 __u16 bytes_remaining;
1883 char *bcc_ptr;
1884 unsigned char *ntlmsspblob = NULL;
1885 u16 blob_len;
1886
1887 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1888
1889 /* wct = 12 */
1890 rc = sess_alloc_buffer(sess_data, 12);
1891 if (rc)
1892 goto out;
1893
1894 /* Build security blob before we assemble the request */
1895 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1896 smb_buf = (struct smb_hdr *)pSMB;
1897 rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1898 &blob_len, ses, server,
1899 sess_data->nls_cp);
1900 if (rc)
1901 goto out_free_ntlmsspblob;
1902 sess_data->iov[1].iov_len = blob_len;
1903 sess_data->iov[1].iov_base = ntlmsspblob;
1904 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1905 /*
1906 * Make sure that we tell the server that we are using
1907 * the uid that it just gave us back on the response
1908 * (challenge)
1909 */
1910 smb_buf->Uid = ses->Suid;
1911
1912 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1913 if (rc)
1914 goto out_free_ntlmsspblob;
1915
1916 rc = sess_sendreceive(sess_data);
1917 if (rc)
1918 goto out_free_ntlmsspblob;
1919
1920 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1921 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1922 if (smb_buf->WordCount != 4) {
1923 rc = -EIO;
1924 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1925 goto out_free_ntlmsspblob;
1926 }
1927
1928 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1929 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1930
1931 if (ses->Suid != smb_buf->Uid) {
1932 ses->Suid = smb_buf->Uid;
1933 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1934 }
1935
1936 bytes_remaining = get_bcc(smb_buf);
1937 bcc_ptr = pByteArea(smb_buf);
1938 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1939 if (blob_len > bytes_remaining) {
1940 cifs_dbg(VFS, "bad security blob length %d\n",
1941 blob_len);
1942 rc = -EINVAL;
1943 goto out_free_ntlmsspblob;
1944 }
1945 bcc_ptr += blob_len;
1946 bytes_remaining -= blob_len;
1947
1948
1949 /* BB check if Unicode and decode strings */
1950 if (bytes_remaining == 0) {
1951 /* no string area to decode, do nothing */
1952 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1953 /* unicode string area must be word-aligned */
1954 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1955 ++bcc_ptr;
1956 --bytes_remaining;
1957 }
1958 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1959 sess_data->nls_cp);
1960 } else {
1961 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1962 sess_data->nls_cp);
1963 }
1964
1965 out_free_ntlmsspblob:
1966 kfree_sensitive(ntlmsspblob);
1967 out:
1968 sess_free_buffer(sess_data);
1969
1970 if (!rc)
1971 rc = sess_establish_session(sess_data);
1972
1973 /* Cleanup */
1974 kfree_sensitive(ses->auth_key.response);
1975 ses->auth_key.response = NULL;
1976 kfree_sensitive(ses->ntlmssp);
1977 ses->ntlmssp = NULL;
1978
1979 sess_data->func = NULL;
1980 sess_data->result = rc;
1981 }
1982
select_sec(struct sess_data * sess_data)1983 static int select_sec(struct sess_data *sess_data)
1984 {
1985 int type;
1986 struct cifs_ses *ses = sess_data->ses;
1987 struct TCP_Server_Info *server = sess_data->server;
1988
1989 type = cifs_select_sectype(server, ses->sectype);
1990 cifs_dbg(FYI, "sess setup type %d\n", type);
1991 if (type == Unspecified) {
1992 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1993 return -EINVAL;
1994 }
1995
1996 switch (type) {
1997 case NTLMv2:
1998 sess_data->func = sess_auth_ntlmv2;
1999 break;
2000 case Kerberos:
2001 #ifdef CONFIG_CIFS_UPCALL
2002 sess_data->func = sess_auth_kerberos;
2003 break;
2004 #else
2005 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
2006 return -ENOSYS;
2007 #endif /* CONFIG_CIFS_UPCALL */
2008 case RawNTLMSSP:
2009 sess_data->func = sess_auth_rawntlmssp_negotiate;
2010 break;
2011 default:
2012 cifs_dbg(VFS, "secType %d not supported!\n", type);
2013 return -ENOSYS;
2014 }
2015
2016 return 0;
2017 }
2018
CIFS_SessSetup(const unsigned int xid,struct cifs_ses * ses,struct TCP_Server_Info * server,const struct nls_table * nls_cp)2019 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
2020 struct TCP_Server_Info *server,
2021 const struct nls_table *nls_cp)
2022 {
2023 int rc = 0;
2024 struct sess_data *sess_data;
2025
2026 if (ses == NULL) {
2027 WARN(1, "%s: ses == NULL!", __func__);
2028 return -EINVAL;
2029 }
2030
2031 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
2032 if (!sess_data)
2033 return -ENOMEM;
2034
2035 sess_data->xid = xid;
2036 sess_data->ses = ses;
2037 sess_data->server = server;
2038 sess_data->buf0_type = CIFS_NO_BUFFER;
2039 sess_data->nls_cp = (struct nls_table *) nls_cp;
2040
2041 rc = select_sec(sess_data);
2042 if (rc)
2043 goto out;
2044
2045 while (sess_data->func)
2046 sess_data->func(sess_data);
2047
2048 /* Store result before we free sess_data */
2049 rc = sess_data->result;
2050
2051 out:
2052 kfree_sensitive(sess_data);
2053 return rc;
2054 }
2055 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2056