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 pSMB->req.SessionKey = server->session_key_id;
687
688 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
689
690 /* BB verify whether signing required on neg or just auth frame (and NTLM case) */
691
692 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
693 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
694
695 if (server->sign)
696 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
697
698 if (ses->capabilities & CAP_UNICODE) {
699 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
700 capabilities |= CAP_UNICODE;
701 }
702 if (ses->capabilities & CAP_STATUS32) {
703 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
704 capabilities |= CAP_STATUS32;
705 }
706 if (ses->capabilities & CAP_DFS) {
707 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
708 capabilities |= CAP_DFS;
709 }
710 if (ses->capabilities & CAP_UNIX)
711 capabilities |= CAP_UNIX;
712
713 return capabilities;
714 }
715
716 static void
unicode_oslm_strings(char ** pbcc_area,const struct nls_table * nls_cp)717 unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
718 {
719 char *bcc_ptr = *pbcc_area;
720 int bytes_ret = 0;
721
722 /* Copy OS version */
723 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
724 nls_cp);
725 bcc_ptr += 2 * bytes_ret;
726 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
727 32, nls_cp);
728 bcc_ptr += 2 * bytes_ret;
729 bcc_ptr += 2; /* trailing null */
730
731 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
732 32, nls_cp);
733 bcc_ptr += 2 * bytes_ret;
734 bcc_ptr += 2; /* trailing null */
735
736 *pbcc_area = bcc_ptr;
737 }
738
739 static void
ascii_oslm_strings(char ** pbcc_area,const struct nls_table * nls_cp)740 ascii_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
741 {
742 char *bcc_ptr = *pbcc_area;
743
744 strcpy(bcc_ptr, "Linux version ");
745 bcc_ptr += strlen("Linux version ");
746 strcpy(bcc_ptr, init_utsname()->release);
747 bcc_ptr += strlen(init_utsname()->release) + 1;
748
749 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
750 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
751
752 *pbcc_area = bcc_ptr;
753 }
754
unicode_domain_string(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)755 static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
756 const struct nls_table *nls_cp)
757 {
758 char *bcc_ptr = *pbcc_area;
759 int bytes_ret = 0;
760
761 /* copy domain */
762 if (ses->domainName == NULL) {
763 /*
764 * Sending null domain better than using a bogus domain name (as
765 * we did briefly in 2.6.18) since server will use its default
766 */
767 *bcc_ptr = 0;
768 *(bcc_ptr+1) = 0;
769 bytes_ret = 0;
770 } else
771 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
772 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
773 bcc_ptr += 2 * bytes_ret;
774 bcc_ptr += 2; /* account for null terminator */
775
776 *pbcc_area = bcc_ptr;
777 }
778
ascii_domain_string(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)779 static void ascii_domain_string(char **pbcc_area, struct cifs_ses *ses,
780 const struct nls_table *nls_cp)
781 {
782 char *bcc_ptr = *pbcc_area;
783 int len;
784
785 /* copy domain */
786 if (ses->domainName != NULL) {
787 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
788 if (WARN_ON_ONCE(len < 0))
789 len = CIFS_MAX_DOMAINNAME_LEN - 1;
790 bcc_ptr += len;
791 } /* else we send a null domain name so server will default to its own domain */
792 *bcc_ptr = 0;
793 bcc_ptr++;
794
795 *pbcc_area = bcc_ptr;
796 }
797
unicode_ssetup_strings(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)798 static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
799 const struct nls_table *nls_cp)
800 {
801 char *bcc_ptr = *pbcc_area;
802 int bytes_ret = 0;
803
804 /* BB FIXME add check that strings less than 335 or will need to send as arrays */
805
806 /* copy user */
807 if (ses->user_name == NULL) {
808 /* null user mount */
809 *bcc_ptr = 0;
810 *(bcc_ptr+1) = 0;
811 } else {
812 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
813 CIFS_MAX_USERNAME_LEN, nls_cp);
814 }
815 bcc_ptr += 2 * bytes_ret;
816 bcc_ptr += 2; /* account for null termination */
817
818 unicode_domain_string(&bcc_ptr, ses, nls_cp);
819 unicode_oslm_strings(&bcc_ptr, nls_cp);
820
821 *pbcc_area = bcc_ptr;
822 }
823
ascii_ssetup_strings(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)824 static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
825 const struct nls_table *nls_cp)
826 {
827 char *bcc_ptr = *pbcc_area;
828 int len;
829
830 /* copy user */
831 /* BB what about null user mounts - check that we do this BB */
832 /* copy user */
833 if (ses->user_name != NULL) {
834 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
835 if (WARN_ON_ONCE(len < 0))
836 len = CIFS_MAX_USERNAME_LEN - 1;
837 bcc_ptr += len;
838 }
839 /* else null user mount */
840 *bcc_ptr = 0;
841 bcc_ptr++; /* account for null termination */
842
843 /* BB check for overflow here */
844
845 ascii_domain_string(&bcc_ptr, ses, nls_cp);
846 ascii_oslm_strings(&bcc_ptr, nls_cp);
847
848 *pbcc_area = bcc_ptr;
849 }
850
851 static void
decode_unicode_ssetup(char ** pbcc_area,int bleft,struct cifs_ses * ses,const struct nls_table * nls_cp)852 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
853 const struct nls_table *nls_cp)
854 {
855 int len;
856 char *data = *pbcc_area;
857
858 cifs_dbg(FYI, "bleft %d\n", bleft);
859
860 kfree(ses->serverOS);
861 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
862 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
863 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
864 data += len;
865 bleft -= len;
866 if (bleft <= 0)
867 return;
868
869 kfree(ses->serverNOS);
870 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
871 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
872 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
873 data += len;
874 bleft -= len;
875 if (bleft <= 0)
876 return;
877
878 kfree(ses->serverDomain);
879 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
880 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
881
882 return;
883 }
884
decode_ascii_ssetup(char ** pbcc_area,__u16 bleft,struct cifs_ses * ses,const struct nls_table * nls_cp)885 static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
886 struct cifs_ses *ses,
887 const struct nls_table *nls_cp)
888 {
889 int len;
890 char *bcc_ptr = *pbcc_area;
891
892 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
893
894 len = strnlen(bcc_ptr, bleft);
895 if (len >= bleft)
896 return;
897
898 kfree(ses->serverOS);
899
900 ses->serverOS = kmalloc(len + 1, GFP_KERNEL);
901 if (ses->serverOS) {
902 memcpy(ses->serverOS, bcc_ptr, len);
903 ses->serverOS[len] = 0;
904 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
905 cifs_dbg(FYI, "OS/2 server\n");
906 }
907
908 bcc_ptr += len + 1;
909 bleft -= len + 1;
910
911 len = strnlen(bcc_ptr, bleft);
912 if (len >= bleft)
913 return;
914
915 kfree(ses->serverNOS);
916
917 ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);
918 if (ses->serverNOS) {
919 memcpy(ses->serverNOS, bcc_ptr, len);
920 ses->serverNOS[len] = 0;
921 }
922
923 bcc_ptr += len + 1;
924 bleft -= len + 1;
925
926 len = strnlen(bcc_ptr, bleft);
927 if (len > bleft)
928 return;
929
930 /*
931 * No domain field in LANMAN case. Domain is
932 * returned by old servers in the SMB negprot response
933 *
934 * BB For newer servers which do not support Unicode,
935 * but thus do return domain here, we could add parsing
936 * for it later, but it is not very important
937 */
938 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
939 }
940 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
941
decode_ntlmssp_challenge(char * bcc_ptr,int blob_len,struct cifs_ses * ses)942 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
943 struct cifs_ses *ses)
944 {
945 unsigned int tioffset; /* challenge message target info area */
946 unsigned int tilen; /* challenge message target info area length */
947 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
948 __u32 server_flags;
949
950 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
951 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
952 return -EINVAL;
953 }
954
955 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
956 cifs_dbg(VFS, "blob signature incorrect %s\n",
957 pblob->Signature);
958 return -EINVAL;
959 }
960 if (pblob->MessageType != NtLmChallenge) {
961 cifs_dbg(VFS, "Incorrect message type %d\n",
962 pblob->MessageType);
963 return -EINVAL;
964 }
965
966 server_flags = le32_to_cpu(pblob->NegotiateFlags);
967 cifs_dbg(FYI, "%s: negotiate=0x%08x challenge=0x%08x\n", __func__,
968 ses->ntlmssp->client_flags, server_flags);
969
970 if ((ses->ntlmssp->client_flags & (NTLMSSP_NEGOTIATE_SEAL | NTLMSSP_NEGOTIATE_SIGN)) &&
971 (!(server_flags & NTLMSSP_NEGOTIATE_56) && !(server_flags & NTLMSSP_NEGOTIATE_128))) {
972 cifs_dbg(VFS, "%s: requested signing/encryption but server did not return either 56-bit or 128-bit session key size\n",
973 __func__);
974 return -EINVAL;
975 }
976 if (!(server_flags & NTLMSSP_NEGOTIATE_NTLM) && !(server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) {
977 cifs_dbg(VFS, "%s: server does not seem to support either NTLMv1 or NTLMv2\n", __func__);
978 return -EINVAL;
979 }
980 if (ses->server->sign && !(server_flags & NTLMSSP_NEGOTIATE_SIGN)) {
981 cifs_dbg(VFS, "%s: forced packet signing but server does not seem to support it\n",
982 __func__);
983 return -EOPNOTSUPP;
984 }
985 if ((ses->ntlmssp->client_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
986 !(server_flags & NTLMSSP_NEGOTIATE_KEY_XCH))
987 pr_warn_once("%s: authentication has been weakened as server does not support key exchange\n",
988 __func__);
989
990 ses->ntlmssp->server_flags = server_flags;
991
992 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
993 /*
994 * In particular we can examine sign flags
995 *
996 * BB spec says that if AvId field of MsvAvTimestamp is populated then
997 * we must set the MIC field of the AUTHENTICATE_MESSAGE
998 */
999
1000 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
1001 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
1002 if (tioffset > blob_len || tioffset + tilen > blob_len) {
1003 cifs_dbg(VFS, "tioffset + tilen too high %u + %u\n",
1004 tioffset, tilen);
1005 return -EINVAL;
1006 }
1007 if (tilen) {
1008 kfree_sensitive(ses->auth_key.response);
1009 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
1010 GFP_KERNEL);
1011 if (!ses->auth_key.response) {
1012 cifs_dbg(VFS, "Challenge target info alloc failure\n");
1013 return -ENOMEM;
1014 }
1015 ses->auth_key.len = tilen;
1016 }
1017
1018 return 0;
1019 }
1020
size_of_ntlmssp_blob(struct cifs_ses * ses,int base_size)1021 static int size_of_ntlmssp_blob(struct cifs_ses *ses, int base_size)
1022 {
1023 int sz = base_size + ses->auth_key.len
1024 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
1025
1026 if (ses->domainName)
1027 sz += sizeof(__le16) * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
1028 else
1029 sz += sizeof(__le16);
1030
1031 if (ses->user_name)
1032 sz += sizeof(__le16) * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
1033 else
1034 sz += sizeof(__le16);
1035
1036 if (ses->workstation_name[0])
1037 sz += sizeof(__le16) * strnlen(ses->workstation_name,
1038 ntlmssp_workstation_name_size(ses));
1039 else
1040 sz += sizeof(__le16);
1041
1042 return sz;
1043 }
1044
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)1045 static inline void cifs_security_buffer_from_str(SECURITY_BUFFER *pbuf,
1046 char *str_value,
1047 int str_length,
1048 unsigned char *pstart,
1049 unsigned char **pcur,
1050 const struct nls_table *nls_cp)
1051 {
1052 unsigned char *tmp = pstart;
1053 int len;
1054
1055 if (!pbuf)
1056 return;
1057
1058 if (!pcur)
1059 pcur = &tmp;
1060
1061 if (!str_value) {
1062 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
1063 pbuf->Length = 0;
1064 pbuf->MaximumLength = 0;
1065 *pcur += sizeof(__le16);
1066 } else {
1067 len = cifs_strtoUTF16((__le16 *)*pcur,
1068 str_value,
1069 str_length,
1070 nls_cp);
1071 len *= sizeof(__le16);
1072 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
1073 pbuf->Length = cpu_to_le16(len);
1074 pbuf->MaximumLength = cpu_to_le16(len);
1075 *pcur += len;
1076 }
1077 }
1078
1079 /* BB Move to ntlmssp.c eventually */
1080
build_ntlmssp_negotiate_blob(unsigned char ** pbuffer,u16 * buflen,struct cifs_ses * ses,struct TCP_Server_Info * server,const struct nls_table * nls_cp)1081 int build_ntlmssp_negotiate_blob(unsigned char **pbuffer,
1082 u16 *buflen,
1083 struct cifs_ses *ses,
1084 struct TCP_Server_Info *server,
1085 const struct nls_table *nls_cp)
1086 {
1087 int rc = 0;
1088 NEGOTIATE_MESSAGE *sec_blob;
1089 __u32 flags;
1090 unsigned char *tmp;
1091 int len;
1092
1093 len = size_of_ntlmssp_blob(ses, sizeof(NEGOTIATE_MESSAGE));
1094 *pbuffer = kmalloc(len, GFP_KERNEL);
1095 if (!*pbuffer) {
1096 rc = -ENOMEM;
1097 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
1098 *buflen = 0;
1099 goto setup_ntlm_neg_ret;
1100 }
1101 sec_blob = (NEGOTIATE_MESSAGE *)*pbuffer;
1102
1103 memset(*pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
1104 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
1105 sec_blob->MessageType = NtLmNegotiate;
1106
1107 /* BB is NTLMV2 session security format easier to use here? */
1108 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
1109 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
1110 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
1111 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
1112 NTLMSSP_NEGOTIATE_SIGN;
1113 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
1114 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
1115
1116 tmp = *pbuffer + sizeof(NEGOTIATE_MESSAGE);
1117 ses->ntlmssp->client_flags = flags;
1118 sec_blob->NegotiateFlags = cpu_to_le32(flags);
1119
1120 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
1121 cifs_security_buffer_from_str(&sec_blob->DomainName,
1122 NULL,
1123 CIFS_MAX_DOMAINNAME_LEN,
1124 *pbuffer, &tmp,
1125 nls_cp);
1126
1127 cifs_security_buffer_from_str(&sec_blob->WorkstationName,
1128 NULL,
1129 CIFS_MAX_WORKSTATION_LEN,
1130 *pbuffer, &tmp,
1131 nls_cp);
1132
1133 *buflen = tmp - *pbuffer;
1134 setup_ntlm_neg_ret:
1135 return rc;
1136 }
1137
1138 /*
1139 * Build ntlmssp blob with additional fields, such as version,
1140 * supported by modern servers. For safety limit to SMB3 or later
1141 * See notes in MS-NLMP Section 2.2.2.1 e.g.
1142 */
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)1143 int build_ntlmssp_smb3_negotiate_blob(unsigned char **pbuffer,
1144 u16 *buflen,
1145 struct cifs_ses *ses,
1146 struct TCP_Server_Info *server,
1147 const struct nls_table *nls_cp)
1148 {
1149 int rc = 0;
1150 struct negotiate_message *sec_blob;
1151 __u32 flags;
1152 unsigned char *tmp;
1153 int len;
1154
1155 len = size_of_ntlmssp_blob(ses, sizeof(struct negotiate_message));
1156 *pbuffer = kmalloc(len, GFP_KERNEL);
1157 if (!*pbuffer) {
1158 rc = -ENOMEM;
1159 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
1160 *buflen = 0;
1161 goto setup_ntlm_smb3_neg_ret;
1162 }
1163 sec_blob = (struct negotiate_message *)*pbuffer;
1164
1165 memset(*pbuffer, 0, sizeof(struct negotiate_message));
1166 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
1167 sec_blob->MessageType = NtLmNegotiate;
1168
1169 /* BB is NTLMV2 session security format easier to use here? */
1170 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
1171 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
1172 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
1173 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
1174 NTLMSSP_NEGOTIATE_SIGN | NTLMSSP_NEGOTIATE_VERSION;
1175 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
1176 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
1177
1178 sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR;
1179 sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL;
1180 sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD);
1181 sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
1182
1183 tmp = *pbuffer + sizeof(struct negotiate_message);
1184 ses->ntlmssp->client_flags = flags;
1185 sec_blob->NegotiateFlags = cpu_to_le32(flags);
1186
1187 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
1188 cifs_security_buffer_from_str(&sec_blob->DomainName,
1189 NULL,
1190 CIFS_MAX_DOMAINNAME_LEN,
1191 *pbuffer, &tmp,
1192 nls_cp);
1193
1194 cifs_security_buffer_from_str(&sec_blob->WorkstationName,
1195 NULL,
1196 CIFS_MAX_WORKSTATION_LEN,
1197 *pbuffer, &tmp,
1198 nls_cp);
1199
1200 *buflen = tmp - *pbuffer;
1201 setup_ntlm_smb3_neg_ret:
1202 return rc;
1203 }
1204
1205
1206 /* 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)1207 int build_ntlmssp_auth_blob(unsigned char **pbuffer,
1208 u16 *buflen,
1209 struct cifs_ses *ses,
1210 struct TCP_Server_Info *server,
1211 const struct nls_table *nls_cp)
1212 {
1213 int rc;
1214 AUTHENTICATE_MESSAGE *sec_blob;
1215 __u32 flags;
1216 unsigned char *tmp;
1217 int len;
1218
1219 rc = setup_ntlmv2_rsp(ses, nls_cp);
1220 if (rc) {
1221 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
1222 *buflen = 0;
1223 goto setup_ntlmv2_ret;
1224 }
1225
1226 len = size_of_ntlmssp_blob(ses, sizeof(AUTHENTICATE_MESSAGE));
1227 *pbuffer = kmalloc(len, GFP_KERNEL);
1228 if (!*pbuffer) {
1229 rc = -ENOMEM;
1230 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
1231 *buflen = 0;
1232 goto setup_ntlmv2_ret;
1233 }
1234 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
1235
1236 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
1237 sec_blob->MessageType = NtLmAuthenticate;
1238
1239 /* send version information in ntlmssp authenticate also */
1240 flags = ses->ntlmssp->server_flags | NTLMSSP_REQUEST_TARGET |
1241 NTLMSSP_NEGOTIATE_TARGET_INFO | NTLMSSP_NEGOTIATE_VERSION |
1242 NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED;
1243
1244 sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR;
1245 sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL;
1246 sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD);
1247 sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
1248
1249 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
1250 sec_blob->NegotiateFlags = cpu_to_le32(flags);
1251
1252 sec_blob->LmChallengeResponse.BufferOffset =
1253 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
1254 sec_blob->LmChallengeResponse.Length = 0;
1255 sec_blob->LmChallengeResponse.MaximumLength = 0;
1256
1257 sec_blob->NtChallengeResponse.BufferOffset =
1258 cpu_to_le32(tmp - *pbuffer);
1259 if (ses->user_name != NULL) {
1260 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1261 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1262 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1263
1264 sec_blob->NtChallengeResponse.Length =
1265 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1266 sec_blob->NtChallengeResponse.MaximumLength =
1267 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1268 } else {
1269 /*
1270 * don't send an NT Response for anonymous access
1271 */
1272 sec_blob->NtChallengeResponse.Length = 0;
1273 sec_blob->NtChallengeResponse.MaximumLength = 0;
1274 }
1275
1276 cifs_security_buffer_from_str(&sec_blob->DomainName,
1277 ses->domainName,
1278 CIFS_MAX_DOMAINNAME_LEN,
1279 *pbuffer, &tmp,
1280 nls_cp);
1281
1282 cifs_security_buffer_from_str(&sec_blob->UserName,
1283 ses->user_name,
1284 CIFS_MAX_USERNAME_LEN,
1285 *pbuffer, &tmp,
1286 nls_cp);
1287
1288 cifs_security_buffer_from_str(&sec_blob->WorkstationName,
1289 ses->workstation_name,
1290 ntlmssp_workstation_name_size(ses),
1291 *pbuffer, &tmp,
1292 nls_cp);
1293
1294 if ((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
1295 (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess) &&
1296 !calc_seckey(ses)) {
1297 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
1298 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
1299 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
1300 sec_blob->SessionKey.MaximumLength =
1301 cpu_to_le16(CIFS_CPHTXT_SIZE);
1302 tmp += CIFS_CPHTXT_SIZE;
1303 } else {
1304 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
1305 sec_blob->SessionKey.Length = 0;
1306 sec_blob->SessionKey.MaximumLength = 0;
1307 }
1308
1309 *buflen = tmp - *pbuffer;
1310 setup_ntlmv2_ret:
1311 return rc;
1312 }
1313
1314 enum securityEnum
cifs_select_sectype(struct TCP_Server_Info * server,enum securityEnum requested)1315 cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1316 {
1317 switch (server->negflavor) {
1318 case CIFS_NEGFLAVOR_EXTENDED:
1319 switch (requested) {
1320 case Kerberos:
1321 case RawNTLMSSP:
1322 case IAKerb:
1323 return requested;
1324 case Unspecified:
1325 if (server->sec_ntlmssp &&
1326 (global_secflags & CIFSSEC_MAY_NTLMSSP))
1327 return RawNTLMSSP;
1328 if ((server->sec_kerberos || server->sec_mskerberos || server->sec_iakerb) &&
1329 (global_secflags & CIFSSEC_MAY_KRB5))
1330 return Kerberos;
1331 fallthrough;
1332 default:
1333 return Unspecified;
1334 }
1335 case CIFS_NEGFLAVOR_UNENCAP:
1336 switch (requested) {
1337 case NTLMv2:
1338 return requested;
1339 case Unspecified:
1340 if (global_secflags & CIFSSEC_MAY_NTLMV2)
1341 return NTLMv2;
1342 break;
1343 default:
1344 break;
1345 }
1346 fallthrough;
1347 default:
1348 return Unspecified;
1349 }
1350 }
1351
1352 struct sess_data {
1353 unsigned int xid;
1354 struct cifs_ses *ses;
1355 struct TCP_Server_Info *server;
1356 struct nls_table *nls_cp;
1357 void (*func)(struct sess_data *);
1358 int result;
1359
1360 /* we will send the SMB in three pieces:
1361 * a fixed length beginning part, an optional
1362 * SPNEGO blob (which can be zero length), and a
1363 * last part which will include the strings
1364 * and rest of bcc area. This allows us to avoid
1365 * a large buffer 17K allocation
1366 */
1367 int buf0_type;
1368 struct kvec iov[3];
1369 };
1370
1371 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1372 static int
sess_alloc_buffer(struct sess_data * sess_data,int wct)1373 sess_alloc_buffer(struct sess_data *sess_data, int wct)
1374 {
1375 int rc;
1376 struct cifs_ses *ses = sess_data->ses;
1377 struct smb_hdr *smb_buf;
1378
1379 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
1380 (void **)&smb_buf);
1381
1382 if (rc)
1383 return rc;
1384
1385 sess_data->iov[0].iov_base = (char *)smb_buf;
1386 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
1387 /*
1388 * This variable will be used to clear the buffer
1389 * allocated above in case of any error in the calling function.
1390 */
1391 sess_data->buf0_type = CIFS_SMALL_BUFFER;
1392
1393 /* 2000 big enough to fit max user, domain, NOS name etc. */
1394 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
1395 if (!sess_data->iov[2].iov_base) {
1396 rc = -ENOMEM;
1397 goto out_free_smb_buf;
1398 }
1399
1400 return 0;
1401
1402 out_free_smb_buf:
1403 cifs_small_buf_release(smb_buf);
1404 sess_data->iov[0].iov_base = NULL;
1405 sess_data->iov[0].iov_len = 0;
1406 sess_data->buf0_type = CIFS_NO_BUFFER;
1407 return rc;
1408 }
1409
1410 static void
sess_free_buffer(struct sess_data * sess_data)1411 sess_free_buffer(struct sess_data *sess_data)
1412 {
1413 struct kvec *iov = sess_data->iov;
1414
1415 /*
1416 * Zero the session data before freeing, as it might contain sensitive info (keys, etc).
1417 * Note that iov[1] is already freed by caller.
1418 */
1419 if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
1420 memzero_explicit(iov[0].iov_base, iov[0].iov_len);
1421
1422 free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
1423 sess_data->buf0_type = CIFS_NO_BUFFER;
1424 kfree_sensitive(iov[2].iov_base);
1425 }
1426
1427 static int
sess_establish_session(struct sess_data * sess_data)1428 sess_establish_session(struct sess_data *sess_data)
1429 {
1430 struct cifs_ses *ses = sess_data->ses;
1431 struct TCP_Server_Info *server = sess_data->server;
1432
1433 cifs_server_lock(server);
1434 if (!server->session_estab) {
1435 if (server->sign) {
1436 server->session_key.response =
1437 kmemdup(ses->auth_key.response,
1438 ses->auth_key.len, GFP_KERNEL);
1439 if (!server->session_key.response) {
1440 cifs_server_unlock(server);
1441 return -ENOMEM;
1442 }
1443 server->session_key.len =
1444 ses->auth_key.len;
1445 }
1446 server->sequence_number = 0x2;
1447 server->session_estab = true;
1448 }
1449 cifs_server_unlock(server);
1450
1451 cifs_dbg(FYI, "CIFS session established successfully\n");
1452 return 0;
1453 }
1454
1455 static int
sess_sendreceive(struct sess_data * sess_data)1456 sess_sendreceive(struct sess_data *sess_data)
1457 {
1458 int rc;
1459 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
1460 __u16 count;
1461 struct kvec rsp_iov = { NULL, 0 };
1462
1463 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
1464 be32_add_cpu(&smb_buf->smb_buf_length, count);
1465 put_bcc(count, smb_buf);
1466
1467 rc = SendReceive2(sess_data->xid, sess_data->ses,
1468 sess_data->iov, 3 /* num_iovecs */,
1469 &sess_data->buf0_type,
1470 CIFS_LOG_ERROR, &rsp_iov);
1471 cifs_small_buf_release(sess_data->iov[0].iov_base);
1472 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1473
1474 return rc;
1475 }
1476
1477 static void
sess_auth_ntlmv2(struct sess_data * sess_data)1478 sess_auth_ntlmv2(struct sess_data *sess_data)
1479 {
1480 int rc = 0;
1481 struct smb_hdr *smb_buf;
1482 SESSION_SETUP_ANDX *pSMB;
1483 char *bcc_ptr;
1484 struct cifs_ses *ses = sess_data->ses;
1485 struct TCP_Server_Info *server = sess_data->server;
1486 __u32 capabilities;
1487 __u16 bytes_remaining;
1488
1489 /* old style NTLM sessionsetup */
1490 /* wct = 13 */
1491 rc = sess_alloc_buffer(sess_data, 13);
1492 if (rc)
1493 goto out;
1494
1495 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1496 bcc_ptr = sess_data->iov[2].iov_base;
1497 capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1498
1499 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
1500
1501 /* LM2 password would be here if we supported it */
1502 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
1503
1504 if (ses->user_name != NULL) {
1505 /* calculate nlmv2 response and session key */
1506 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
1507 if (rc) {
1508 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
1509 goto out;
1510 }
1511
1512 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1513 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1514 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1515
1516 /* set case sensitive password length after tilen may get
1517 * assigned, tilen is 0 otherwise.
1518 */
1519 pSMB->req_no_secext.CaseSensitivePasswordLength =
1520 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1521 } else {
1522 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
1523 }
1524
1525 if (ses->capabilities & CAP_UNICODE) {
1526 if (!IS_ALIGNED(sess_data->iov[0].iov_len, 2)) {
1527 *bcc_ptr = 0;
1528 bcc_ptr++;
1529 }
1530 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1531 } else {
1532 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1533 }
1534
1535
1536 sess_data->iov[2].iov_len = (long) bcc_ptr -
1537 (long) sess_data->iov[2].iov_base;
1538
1539 rc = sess_sendreceive(sess_data);
1540 if (rc)
1541 goto out;
1542
1543 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1544 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1545
1546 if (smb_buf->WordCount != 3) {
1547 rc = -EIO;
1548 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1549 goto out;
1550 }
1551
1552 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1553 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1554
1555 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1556 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1557
1558 bytes_remaining = get_bcc(smb_buf);
1559 bcc_ptr = pByteArea(smb_buf);
1560
1561 /* BB check if Unicode and decode strings */
1562 if (bytes_remaining == 0) {
1563 /* no string area to decode, do nothing */
1564 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1565 /* unicode string area must be word-aligned */
1566 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1567 ++bcc_ptr;
1568 --bytes_remaining;
1569 }
1570 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1571 sess_data->nls_cp);
1572 } else {
1573 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1574 sess_data->nls_cp);
1575 }
1576
1577 rc = sess_establish_session(sess_data);
1578 out:
1579 sess_data->result = rc;
1580 sess_data->func = NULL;
1581 sess_free_buffer(sess_data);
1582 kfree_sensitive(ses->auth_key.response);
1583 ses->auth_key.response = NULL;
1584 }
1585
1586 #ifdef CONFIG_CIFS_UPCALL
1587 static void
sess_auth_kerberos(struct sess_data * sess_data)1588 sess_auth_kerberos(struct sess_data *sess_data)
1589 {
1590 int rc = 0;
1591 struct smb_hdr *smb_buf;
1592 SESSION_SETUP_ANDX *pSMB;
1593 char *bcc_ptr;
1594 struct cifs_ses *ses = sess_data->ses;
1595 struct TCP_Server_Info *server = sess_data->server;
1596 __u32 capabilities;
1597 __u16 bytes_remaining;
1598 struct key *spnego_key = NULL;
1599 struct cifs_spnego_msg *msg;
1600 u16 blob_len;
1601
1602 /* extended security */
1603 /* wct = 12 */
1604 rc = sess_alloc_buffer(sess_data, 12);
1605 if (rc)
1606 goto out;
1607
1608 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1609 bcc_ptr = sess_data->iov[2].iov_base;
1610 capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1611
1612 spnego_key = cifs_get_spnego_key(ses, server);
1613 if (IS_ERR(spnego_key)) {
1614 rc = PTR_ERR(spnego_key);
1615 spnego_key = NULL;
1616 goto out;
1617 }
1618
1619 msg = spnego_key->payload.data[0];
1620 /*
1621 * check version field to make sure that cifs.upcall is
1622 * sending us a response in an expected form
1623 */
1624 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1625 cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n",
1626 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1627 rc = -EKEYREJECTED;
1628 goto out_put_spnego_key;
1629 }
1630
1631 kfree_sensitive(ses->auth_key.response);
1632 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1633 GFP_KERNEL);
1634 if (!ses->auth_key.response) {
1635 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1636 msg->sesskey_len);
1637 rc = -ENOMEM;
1638 goto out_put_spnego_key;
1639 }
1640 ses->auth_key.len = msg->sesskey_len;
1641
1642 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1643 capabilities |= CAP_EXTENDED_SECURITY;
1644 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1645 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1646 sess_data->iov[1].iov_len = msg->secblob_len;
1647 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1648
1649 if (pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) {
1650 /* unicode strings must be word aligned */
1651 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
1652 *bcc_ptr = 0;
1653 bcc_ptr++;
1654 }
1655 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1656 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1657 } else {
1658 ascii_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1659 ascii_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1660 }
1661
1662 sess_data->iov[2].iov_len = (long) bcc_ptr -
1663 (long) sess_data->iov[2].iov_base;
1664
1665 rc = sess_sendreceive(sess_data);
1666 if (rc)
1667 goto out_put_spnego_key;
1668
1669 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1670 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1671
1672 if (smb_buf->WordCount != 4) {
1673 rc = -EIO;
1674 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1675 goto out_put_spnego_key;
1676 }
1677
1678 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1679 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1680
1681 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1682 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1683
1684 bytes_remaining = get_bcc(smb_buf);
1685 bcc_ptr = pByteArea(smb_buf);
1686
1687 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1688 if (blob_len > bytes_remaining) {
1689 cifs_dbg(VFS, "bad security blob length %d\n",
1690 blob_len);
1691 rc = -EINVAL;
1692 goto out_put_spnego_key;
1693 }
1694 bcc_ptr += blob_len;
1695 bytes_remaining -= blob_len;
1696
1697 /* BB check if Unicode and decode strings */
1698 if (bytes_remaining == 0) {
1699 /* no string area to decode, do nothing */
1700 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1701 /* unicode string area must be word-aligned */
1702 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1703 ++bcc_ptr;
1704 --bytes_remaining;
1705 }
1706 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1707 sess_data->nls_cp);
1708 } else {
1709 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1710 sess_data->nls_cp);
1711 }
1712
1713 rc = sess_establish_session(sess_data);
1714 out_put_spnego_key:
1715 key_invalidate(spnego_key);
1716 key_put(spnego_key);
1717 out:
1718 sess_data->result = rc;
1719 sess_data->func = NULL;
1720 sess_free_buffer(sess_data);
1721 kfree_sensitive(ses->auth_key.response);
1722 ses->auth_key.response = NULL;
1723 }
1724
1725 #endif /* ! CONFIG_CIFS_UPCALL */
1726
1727 /*
1728 * The required kvec buffers have to be allocated before calling this
1729 * function.
1730 */
1731 static int
_sess_auth_rawntlmssp_assemble_req(struct sess_data * sess_data)1732 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1733 {
1734 SESSION_SETUP_ANDX *pSMB;
1735 struct cifs_ses *ses = sess_data->ses;
1736 struct TCP_Server_Info *server = sess_data->server;
1737 __u32 capabilities;
1738 char *bcc_ptr;
1739
1740 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1741
1742 capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1743 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1744 capabilities |= CAP_EXTENDED_SECURITY;
1745 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1746
1747 bcc_ptr = sess_data->iov[2].iov_base;
1748
1749 if (pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) {
1750 /* unicode strings must be word aligned */
1751 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
1752 *bcc_ptr = 0;
1753 bcc_ptr++;
1754 }
1755 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1756 } else {
1757 ascii_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1758 }
1759
1760 sess_data->iov[2].iov_len = (long) bcc_ptr -
1761 (long) sess_data->iov[2].iov_base;
1762
1763 return 0;
1764 }
1765
1766 static void
1767 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1768
1769 static void
sess_auth_rawntlmssp_negotiate(struct sess_data * sess_data)1770 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1771 {
1772 int rc;
1773 struct smb_hdr *smb_buf;
1774 SESSION_SETUP_ANDX *pSMB;
1775 struct cifs_ses *ses = sess_data->ses;
1776 struct TCP_Server_Info *server = sess_data->server;
1777 __u16 bytes_remaining;
1778 char *bcc_ptr;
1779 unsigned char *ntlmsspblob = NULL;
1780 u16 blob_len;
1781
1782 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1783
1784 /*
1785 * if memory allocation is successful, caller of this function
1786 * frees it.
1787 */
1788 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1789 if (!ses->ntlmssp) {
1790 rc = -ENOMEM;
1791 goto out;
1792 }
1793 ses->ntlmssp->sesskey_per_smbsess = false;
1794
1795 /* wct = 12 */
1796 rc = sess_alloc_buffer(sess_data, 12);
1797 if (rc)
1798 goto out;
1799
1800 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1801
1802 /* Build security blob before we assemble the request */
1803 rc = build_ntlmssp_negotiate_blob(&ntlmsspblob,
1804 &blob_len, ses, server,
1805 sess_data->nls_cp);
1806 if (rc)
1807 goto out_free_ntlmsspblob;
1808
1809 sess_data->iov[1].iov_len = blob_len;
1810 sess_data->iov[1].iov_base = ntlmsspblob;
1811 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1812
1813 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1814 if (rc)
1815 goto out_free_ntlmsspblob;
1816
1817 rc = sess_sendreceive(sess_data);
1818
1819 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1820 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1821
1822 /* If true, rc here is expected and not an error */
1823 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1824 smb_buf->Status.CifsError ==
1825 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1826 rc = 0;
1827
1828 if (rc)
1829 goto out_free_ntlmsspblob;
1830
1831 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1832
1833 if (smb_buf->WordCount != 4) {
1834 rc = -EIO;
1835 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1836 goto out_free_ntlmsspblob;
1837 }
1838
1839 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1840 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1841
1842 bytes_remaining = get_bcc(smb_buf);
1843 bcc_ptr = pByteArea(smb_buf);
1844
1845 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1846 if (blob_len > bytes_remaining) {
1847 cifs_dbg(VFS, "bad security blob length %d\n",
1848 blob_len);
1849 rc = -EINVAL;
1850 goto out_free_ntlmsspblob;
1851 }
1852
1853 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1854
1855 out_free_ntlmsspblob:
1856 kfree_sensitive(ntlmsspblob);
1857 out:
1858 sess_free_buffer(sess_data);
1859
1860 if (!rc) {
1861 sess_data->func = sess_auth_rawntlmssp_authenticate;
1862 return;
1863 }
1864
1865 /* Else error. Cleanup */
1866 kfree_sensitive(ses->auth_key.response);
1867 ses->auth_key.response = NULL;
1868 kfree_sensitive(ses->ntlmssp);
1869 ses->ntlmssp = NULL;
1870
1871 sess_data->func = NULL;
1872 sess_data->result = rc;
1873 }
1874
1875 static void
sess_auth_rawntlmssp_authenticate(struct sess_data * sess_data)1876 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1877 {
1878 int rc;
1879 struct smb_hdr *smb_buf;
1880 SESSION_SETUP_ANDX *pSMB;
1881 struct cifs_ses *ses = sess_data->ses;
1882 struct TCP_Server_Info *server = sess_data->server;
1883 __u16 bytes_remaining;
1884 char *bcc_ptr;
1885 unsigned char *ntlmsspblob = NULL;
1886 u16 blob_len;
1887
1888 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1889
1890 /* wct = 12 */
1891 rc = sess_alloc_buffer(sess_data, 12);
1892 if (rc)
1893 goto out;
1894
1895 /* Build security blob before we assemble the request */
1896 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1897 smb_buf = (struct smb_hdr *)pSMB;
1898 rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1899 &blob_len, ses, server,
1900 sess_data->nls_cp);
1901 if (rc)
1902 goto out_free_ntlmsspblob;
1903 sess_data->iov[1].iov_len = blob_len;
1904 sess_data->iov[1].iov_base = ntlmsspblob;
1905 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1906 /*
1907 * Make sure that we tell the server that we are using
1908 * the uid that it just gave us back on the response
1909 * (challenge)
1910 */
1911 smb_buf->Uid = ses->Suid;
1912
1913 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1914 if (rc)
1915 goto out_free_ntlmsspblob;
1916
1917 rc = sess_sendreceive(sess_data);
1918 if (rc)
1919 goto out_free_ntlmsspblob;
1920
1921 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1922 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1923 if (smb_buf->WordCount != 4) {
1924 rc = -EIO;
1925 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1926 goto out_free_ntlmsspblob;
1927 }
1928
1929 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1930 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1931
1932 if (ses->Suid != smb_buf->Uid) {
1933 ses->Suid = smb_buf->Uid;
1934 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1935 }
1936
1937 bytes_remaining = get_bcc(smb_buf);
1938 bcc_ptr = pByteArea(smb_buf);
1939 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1940 if (blob_len > bytes_remaining) {
1941 cifs_dbg(VFS, "bad security blob length %d\n",
1942 blob_len);
1943 rc = -EINVAL;
1944 goto out_free_ntlmsspblob;
1945 }
1946 bcc_ptr += blob_len;
1947 bytes_remaining -= blob_len;
1948
1949
1950 /* BB check if Unicode and decode strings */
1951 if (bytes_remaining == 0) {
1952 /* no string area to decode, do nothing */
1953 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1954 /* unicode string area must be word-aligned */
1955 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1956 ++bcc_ptr;
1957 --bytes_remaining;
1958 }
1959 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1960 sess_data->nls_cp);
1961 } else {
1962 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1963 sess_data->nls_cp);
1964 }
1965
1966 out_free_ntlmsspblob:
1967 kfree_sensitive(ntlmsspblob);
1968 out:
1969 sess_free_buffer(sess_data);
1970
1971 if (!rc)
1972 rc = sess_establish_session(sess_data);
1973
1974 /* Cleanup */
1975 kfree_sensitive(ses->auth_key.response);
1976 ses->auth_key.response = NULL;
1977 kfree_sensitive(ses->ntlmssp);
1978 ses->ntlmssp = NULL;
1979
1980 sess_data->func = NULL;
1981 sess_data->result = rc;
1982 }
1983
select_sec(struct sess_data * sess_data)1984 static int select_sec(struct sess_data *sess_data)
1985 {
1986 int type;
1987 struct cifs_ses *ses = sess_data->ses;
1988 struct TCP_Server_Info *server = sess_data->server;
1989
1990 type = cifs_select_sectype(server, ses->sectype);
1991 cifs_dbg(FYI, "sess setup type %d\n", type);
1992 if (type == Unspecified) {
1993 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1994 return -EINVAL;
1995 }
1996
1997 switch (type) {
1998 case NTLMv2:
1999 sess_data->func = sess_auth_ntlmv2;
2000 break;
2001 case Kerberos:
2002 #ifdef CONFIG_CIFS_UPCALL
2003 sess_data->func = sess_auth_kerberos;
2004 break;
2005 #else
2006 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
2007 return -ENOSYS;
2008 #endif /* CONFIG_CIFS_UPCALL */
2009 case RawNTLMSSP:
2010 sess_data->func = sess_auth_rawntlmssp_negotiate;
2011 break;
2012 default:
2013 cifs_dbg(VFS, "secType %d not supported!\n", type);
2014 return -ENOSYS;
2015 }
2016
2017 return 0;
2018 }
2019
CIFS_SessSetup(const unsigned int xid,struct cifs_ses * ses,struct TCP_Server_Info * server,const struct nls_table * nls_cp)2020 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
2021 struct TCP_Server_Info *server,
2022 const struct nls_table *nls_cp)
2023 {
2024 int rc = 0;
2025 struct sess_data *sess_data;
2026
2027 if (ses == NULL) {
2028 WARN(1, "%s: ses == NULL!", __func__);
2029 return -EINVAL;
2030 }
2031
2032 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
2033 if (!sess_data)
2034 return -ENOMEM;
2035
2036 sess_data->xid = xid;
2037 sess_data->ses = ses;
2038 sess_data->server = server;
2039 sess_data->buf0_type = CIFS_NO_BUFFER;
2040 sess_data->nls_cp = (struct nls_table *) nls_cp;
2041
2042 rc = select_sec(sess_data);
2043 if (rc)
2044 goto out;
2045
2046 while (sess_data->func)
2047 sess_data->func(sess_data);
2048
2049 /* Store result before we free sess_data */
2050 rc = sess_data->result;
2051
2052 out:
2053 kfree_sensitive(sess_data);
2054 return rc;
2055 }
2056 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2057