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
490 /*
491 * If server is a channel of ses, return the corresponding enclosing
492 * cifs_chan otherwise return NULL.
493 */
494 struct cifs_chan *
cifs_ses_find_chan(struct cifs_ses * ses,struct TCP_Server_Info * server)495 cifs_ses_find_chan(struct cifs_ses *ses, struct TCP_Server_Info *server)
496 {
497 int i;
498
499 spin_lock(&ses->chan_lock);
500 for (i = 0; i < ses->chan_count; i++) {
501 if (ses->chans[i].server == server) {
502 spin_unlock(&ses->chan_lock);
503 return &ses->chans[i];
504 }
505 }
506 spin_unlock(&ses->chan_lock);
507 return NULL;
508 }
509
510 static int
cifs_ses_add_channel(struct cifs_ses * ses,struct cifs_server_iface * iface)511 cifs_ses_add_channel(struct cifs_ses *ses,
512 struct cifs_server_iface *iface)
513 {
514 struct TCP_Server_Info *chan_server;
515 struct cifs_chan *chan;
516 struct smb3_fs_context *ctx;
517 static const char unc_fmt[] = "\\%s\\foo";
518 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;
519 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;
520 size_t len;
521 int rc;
522 unsigned int xid = get_xid();
523
524 if (iface->sockaddr.ss_family == AF_INET)
525 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI4)\n",
526 ses, iface->speed, iface->rdma_capable ? "yes" : "no",
527 &ipv4->sin_addr);
528 else
529 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI6)\n",
530 ses, iface->speed, iface->rdma_capable ? "yes" : "no",
531 &ipv6->sin6_addr);
532
533 /*
534 * Setup a ctx with mostly the same info as the existing
535 * session and overwrite it with the requested iface data.
536 *
537 * We need to setup at least the fields used for negprot and
538 * sesssetup.
539 *
540 * We only need the ctx here, so we can reuse memory from
541 * the session and server without caring about memory
542 * management.
543 */
544 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
545 if (!ctx) {
546 rc = -ENOMEM;
547 goto out_free_xid;
548 }
549
550 /* Always make new connection for now (TODO?) */
551 ctx->nosharesock = true;
552
553 /* Auth */
554 ctx->domainauto = ses->domainAuto;
555 ctx->domainname = ses->domainName;
556
557 /* no hostname for extra channels */
558 ctx->server_hostname = "";
559
560 ctx->username = ses->user_name;
561 ctx->password = ses->password;
562 ctx->sectype = ses->sectype;
563 ctx->sign = ses->sign;
564
565 /* UNC and paths */
566 /* XXX: Use ses->server->hostname? */
567 len = sizeof(unc_fmt) + SERVER_NAME_LEN_WITH_NULL;
568 ctx->UNC = kzalloc(len, GFP_KERNEL);
569 if (!ctx->UNC) {
570 rc = -ENOMEM;
571 goto out_free_ctx;
572 }
573 scnprintf(ctx->UNC, len, unc_fmt, ses->ip_addr);
574 ctx->prepath = "";
575
576 /* Reuse same version as master connection */
577 ctx->vals = ses->server->vals;
578 ctx->ops = ses->server->ops;
579
580 ctx->noblocksnd = ses->server->noblocksnd;
581 ctx->noautotune = ses->server->noautotune;
582 ctx->sockopt_tcp_nodelay = ses->server->tcp_nodelay;
583 ctx->echo_interval = ses->server->echo_interval / HZ;
584 ctx->max_credits = ses->server->max_credits;
585
586 /*
587 * This will be used for encoding/decoding user/domain/pw
588 * during sess setup auth.
589 */
590 ctx->local_nls = ses->local_nls;
591
592 /* Use RDMA if possible */
593 ctx->rdma = iface->rdma_capable;
594 memcpy(&ctx->dstaddr, &iface->sockaddr, sizeof(ctx->dstaddr));
595
596 /* reuse master con client guid */
597 memcpy(&ctx->client_guid, ses->server->client_guid,
598 sizeof(ctx->client_guid));
599 ctx->use_client_guid = true;
600
601 chan_server = cifs_get_tcp_session(ctx, ses->server);
602
603 spin_lock(&ses->chan_lock);
604 chan = &ses->chans[ses->chan_count];
605 chan->server = chan_server;
606 if (IS_ERR(chan->server)) {
607 rc = PTR_ERR(chan->server);
608 chan->server = NULL;
609 spin_unlock(&ses->chan_lock);
610 goto out;
611 }
612 chan->iface = iface;
613 ses->chan_count++;
614 atomic_set(&ses->chan_seq, 0);
615
616 /* Mark this channel as needing connect/setup */
617 cifs_chan_set_need_reconnect(ses, chan->server);
618
619 spin_unlock(&ses->chan_lock);
620
621 mutex_lock(&ses->session_mutex);
622 /*
623 * We need to allocate the server crypto now as we will need
624 * to sign packets before we generate the channel signing key
625 * (we sign with the session key)
626 */
627 rc = smb311_crypto_shash_allocate(chan->server);
628 if (rc) {
629 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
630 mutex_unlock(&ses->session_mutex);
631 goto out;
632 }
633
634 rc = cifs_negotiate_protocol(xid, ses, chan->server);
635 if (!rc)
636 rc = cifs_setup_session(xid, ses, chan->server, ses->local_nls);
637
638 mutex_unlock(&ses->session_mutex);
639
640 out:
641 if (rc && chan->server) {
642 cifs_put_tcp_session(chan->server, 0);
643
644 spin_lock(&ses->chan_lock);
645
646 /* we rely on all bits beyond chan_count to be clear */
647 cifs_chan_clear_need_reconnect(ses, chan->server);
648 ses->chan_count--;
649 /*
650 * chan_count should never reach 0 as at least the primary
651 * channel is always allocated
652 */
653 WARN_ON(ses->chan_count < 1);
654 spin_unlock(&ses->chan_lock);
655 }
656
657 kfree(ctx->UNC);
658 out_free_ctx:
659 kfree(ctx);
660 out_free_xid:
661 free_xid(xid);
662 return rc;
663 }
664
665 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
cifs_ssetup_hdr(struct cifs_ses * ses,struct TCP_Server_Info * server,SESSION_SETUP_ANDX * pSMB)666 static __u32 cifs_ssetup_hdr(struct cifs_ses *ses,
667 struct TCP_Server_Info *server,
668 SESSION_SETUP_ANDX *pSMB)
669 {
670 __u32 capabilities = 0;
671
672 /* init fields common to all four types of SessSetup */
673 /* Note that offsets for first seven fields in req struct are same */
674 /* in CIFS Specs so does not matter which of 3 forms of struct */
675 /* that we use in next few lines */
676 /* Note that header is initialized to zero in header_assemble */
677 pSMB->req.AndXCommand = 0xFF;
678 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
679 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
680 USHRT_MAX));
681 pSMB->req.MaxMpxCount = cpu_to_le16(server->maxReq);
682 pSMB->req.VcNumber = cpu_to_le16(1);
683
684 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
685
686 /* BB verify whether signing required on neg or just auth frame (and NTLM case) */
687
688 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
689 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
690
691 if (server->sign)
692 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
693
694 if (ses->capabilities & CAP_UNICODE) {
695 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
696 capabilities |= CAP_UNICODE;
697 }
698 if (ses->capabilities & CAP_STATUS32) {
699 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
700 capabilities |= CAP_STATUS32;
701 }
702 if (ses->capabilities & CAP_DFS) {
703 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
704 capabilities |= CAP_DFS;
705 }
706 if (ses->capabilities & CAP_UNIX)
707 capabilities |= CAP_UNIX;
708
709 return capabilities;
710 }
711
712 static void
unicode_oslm_strings(char ** pbcc_area,const struct nls_table * nls_cp)713 unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
714 {
715 char *bcc_ptr = *pbcc_area;
716 int bytes_ret = 0;
717
718 /* Copy OS version */
719 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
720 nls_cp);
721 bcc_ptr += 2 * bytes_ret;
722 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
723 32, nls_cp);
724 bcc_ptr += 2 * bytes_ret;
725 bcc_ptr += 2; /* trailing null */
726
727 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
728 32, nls_cp);
729 bcc_ptr += 2 * bytes_ret;
730 bcc_ptr += 2; /* trailing null */
731
732 *pbcc_area = bcc_ptr;
733 }
734
unicode_domain_string(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)735 static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
736 const struct nls_table *nls_cp)
737 {
738 char *bcc_ptr = *pbcc_area;
739 int bytes_ret = 0;
740
741 /* copy domain */
742 if (ses->domainName == NULL) {
743 /*
744 * Sending null domain better than using a bogus domain name (as
745 * we did briefly in 2.6.18) since server will use its default
746 */
747 *bcc_ptr = 0;
748 *(bcc_ptr+1) = 0;
749 bytes_ret = 0;
750 } else
751 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
752 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
753 bcc_ptr += 2 * bytes_ret;
754 bcc_ptr += 2; /* account for null terminator */
755
756 *pbcc_area = bcc_ptr;
757 }
758
unicode_ssetup_strings(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)759 static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
760 const struct nls_table *nls_cp)
761 {
762 char *bcc_ptr = *pbcc_area;
763 int bytes_ret = 0;
764
765 /* BB FIXME add check that strings less than 335 or will need to send as arrays */
766
767 /* copy user */
768 if (ses->user_name == NULL) {
769 /* null user mount */
770 *bcc_ptr = 0;
771 *(bcc_ptr+1) = 0;
772 } else {
773 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
774 CIFS_MAX_USERNAME_LEN, nls_cp);
775 }
776 bcc_ptr += 2 * bytes_ret;
777 bcc_ptr += 2; /* account for null termination */
778
779 unicode_domain_string(&bcc_ptr, ses, nls_cp);
780 unicode_oslm_strings(&bcc_ptr, nls_cp);
781
782 *pbcc_area = bcc_ptr;
783 }
784
ascii_ssetup_strings(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)785 static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
786 const struct nls_table *nls_cp)
787 {
788 char *bcc_ptr = *pbcc_area;
789 int len;
790
791 /* copy user */
792 /* BB what about null user mounts - check that we do this BB */
793 /* copy user */
794 if (ses->user_name != NULL) {
795 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
796 if (WARN_ON_ONCE(len < 0))
797 len = CIFS_MAX_USERNAME_LEN - 1;
798 bcc_ptr += len;
799 }
800 /* else null user mount */
801 *bcc_ptr = 0;
802 bcc_ptr++; /* account for null termination */
803
804 /* copy domain */
805 if (ses->domainName != NULL) {
806 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
807 if (WARN_ON_ONCE(len < 0))
808 len = CIFS_MAX_DOMAINNAME_LEN - 1;
809 bcc_ptr += len;
810 } /* else we send a null domain name so server will default to its own domain */
811 *bcc_ptr = 0;
812 bcc_ptr++;
813
814 /* BB check for overflow here */
815
816 strcpy(bcc_ptr, "Linux version ");
817 bcc_ptr += strlen("Linux version ");
818 strcpy(bcc_ptr, init_utsname()->release);
819 bcc_ptr += strlen(init_utsname()->release) + 1;
820
821 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
822 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
823
824 *pbcc_area = bcc_ptr;
825 }
826
827 static void
decode_unicode_ssetup(char ** pbcc_area,int bleft,struct cifs_ses * ses,const struct nls_table * nls_cp)828 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
829 const struct nls_table *nls_cp)
830 {
831 int len;
832 char *data = *pbcc_area;
833
834 cifs_dbg(FYI, "bleft %d\n", bleft);
835
836 kfree(ses->serverOS);
837 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
838 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
839 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
840 data += len;
841 bleft -= len;
842 if (bleft <= 0)
843 return;
844
845 kfree(ses->serverNOS);
846 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
847 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
848 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
849 data += len;
850 bleft -= len;
851 if (bleft <= 0)
852 return;
853
854 kfree(ses->serverDomain);
855 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
856 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
857
858 return;
859 }
860
decode_ascii_ssetup(char ** pbcc_area,__u16 bleft,struct cifs_ses * ses,const struct nls_table * nls_cp)861 static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
862 struct cifs_ses *ses,
863 const struct nls_table *nls_cp)
864 {
865 int len;
866 char *bcc_ptr = *pbcc_area;
867
868 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
869
870 len = strnlen(bcc_ptr, bleft);
871 if (len >= bleft)
872 return;
873
874 kfree(ses->serverOS);
875
876 ses->serverOS = kmalloc(len + 1, GFP_KERNEL);
877 if (ses->serverOS) {
878 memcpy(ses->serverOS, bcc_ptr, len);
879 ses->serverOS[len] = 0;
880 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
881 cifs_dbg(FYI, "OS/2 server\n");
882 }
883
884 bcc_ptr += len + 1;
885 bleft -= len + 1;
886
887 len = strnlen(bcc_ptr, bleft);
888 if (len >= bleft)
889 return;
890
891 kfree(ses->serverNOS);
892
893 ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);
894 if (ses->serverNOS) {
895 memcpy(ses->serverNOS, bcc_ptr, len);
896 ses->serverNOS[len] = 0;
897 }
898
899 bcc_ptr += len + 1;
900 bleft -= len + 1;
901
902 len = strnlen(bcc_ptr, bleft);
903 if (len > bleft)
904 return;
905
906 /*
907 * No domain field in LANMAN case. Domain is
908 * returned by old servers in the SMB negprot response
909 *
910 * BB For newer servers which do not support Unicode,
911 * but thus do return domain here, we could add parsing
912 * for it later, but it is not very important
913 */
914 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
915 }
916 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
917
decode_ntlmssp_challenge(char * bcc_ptr,int blob_len,struct cifs_ses * ses)918 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
919 struct cifs_ses *ses)
920 {
921 unsigned int tioffset; /* challenge message target info area */
922 unsigned int tilen; /* challenge message target info area length */
923 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
924 __u32 server_flags;
925
926 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
927 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
928 return -EINVAL;
929 }
930
931 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
932 cifs_dbg(VFS, "blob signature incorrect %s\n",
933 pblob->Signature);
934 return -EINVAL;
935 }
936 if (pblob->MessageType != NtLmChallenge) {
937 cifs_dbg(VFS, "Incorrect message type %d\n",
938 pblob->MessageType);
939 return -EINVAL;
940 }
941
942 server_flags = le32_to_cpu(pblob->NegotiateFlags);
943 cifs_dbg(FYI, "%s: negotiate=0x%08x challenge=0x%08x\n", __func__,
944 ses->ntlmssp->client_flags, server_flags);
945
946 if ((ses->ntlmssp->client_flags & (NTLMSSP_NEGOTIATE_SEAL | NTLMSSP_NEGOTIATE_SIGN)) &&
947 (!(server_flags & NTLMSSP_NEGOTIATE_56) && !(server_flags & NTLMSSP_NEGOTIATE_128))) {
948 cifs_dbg(VFS, "%s: requested signing/encryption but server did not return either 56-bit or 128-bit session key size\n",
949 __func__);
950 return -EINVAL;
951 }
952 if (!(server_flags & NTLMSSP_NEGOTIATE_NTLM) && !(server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) {
953 cifs_dbg(VFS, "%s: server does not seem to support either NTLMv1 or NTLMv2\n", __func__);
954 return -EINVAL;
955 }
956 if (ses->server->sign && !(server_flags & NTLMSSP_NEGOTIATE_SIGN)) {
957 cifs_dbg(VFS, "%s: forced packet signing but server does not seem to support it\n",
958 __func__);
959 return -EOPNOTSUPP;
960 }
961 if ((ses->ntlmssp->client_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
962 !(server_flags & NTLMSSP_NEGOTIATE_KEY_XCH))
963 pr_warn_once("%s: authentication has been weakened as server does not support key exchange\n",
964 __func__);
965
966 ses->ntlmssp->server_flags = server_flags;
967
968 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
969 /*
970 * In particular we can examine sign flags
971 *
972 * BB spec says that if AvId field of MsvAvTimestamp is populated then
973 * we must set the MIC field of the AUTHENTICATE_MESSAGE
974 */
975
976 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
977 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
978 if (tioffset > blob_len || tioffset + tilen > blob_len) {
979 cifs_dbg(VFS, "tioffset + tilen too high %u + %u\n",
980 tioffset, tilen);
981 return -EINVAL;
982 }
983 if (tilen) {
984 kfree_sensitive(ses->auth_key.response);
985 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
986 GFP_KERNEL);
987 if (!ses->auth_key.response) {
988 cifs_dbg(VFS, "Challenge target info alloc failure\n");
989 return -ENOMEM;
990 }
991 ses->auth_key.len = tilen;
992 }
993
994 return 0;
995 }
996
size_of_ntlmssp_blob(struct cifs_ses * ses,int base_size)997 static int size_of_ntlmssp_blob(struct cifs_ses *ses, int base_size)
998 {
999 int sz = base_size + ses->auth_key.len
1000 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
1001
1002 if (ses->domainName)
1003 sz += sizeof(__le16) * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
1004 else
1005 sz += sizeof(__le16);
1006
1007 if (ses->user_name)
1008 sz += sizeof(__le16) * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
1009 else
1010 sz += sizeof(__le16);
1011
1012 if (ses->workstation_name[0])
1013 sz += sizeof(__le16) * strnlen(ses->workstation_name,
1014 ntlmssp_workstation_name_size(ses));
1015 else
1016 sz += sizeof(__le16);
1017
1018 return sz;
1019 }
1020
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)1021 static inline void cifs_security_buffer_from_str(SECURITY_BUFFER *pbuf,
1022 char *str_value,
1023 int str_length,
1024 unsigned char *pstart,
1025 unsigned char **pcur,
1026 const struct nls_table *nls_cp)
1027 {
1028 unsigned char *tmp = pstart;
1029 int len;
1030
1031 if (!pbuf)
1032 return;
1033
1034 if (!pcur)
1035 pcur = &tmp;
1036
1037 if (!str_value) {
1038 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
1039 pbuf->Length = 0;
1040 pbuf->MaximumLength = 0;
1041 *pcur += sizeof(__le16);
1042 } else {
1043 len = cifs_strtoUTF16((__le16 *)*pcur,
1044 str_value,
1045 str_length,
1046 nls_cp);
1047 len *= sizeof(__le16);
1048 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
1049 pbuf->Length = cpu_to_le16(len);
1050 pbuf->MaximumLength = cpu_to_le16(len);
1051 *pcur += len;
1052 }
1053 }
1054
1055 /* BB Move to ntlmssp.c eventually */
1056
build_ntlmssp_negotiate_blob(unsigned char ** pbuffer,u16 * buflen,struct cifs_ses * ses,struct TCP_Server_Info * server,const struct nls_table * nls_cp)1057 int build_ntlmssp_negotiate_blob(unsigned char **pbuffer,
1058 u16 *buflen,
1059 struct cifs_ses *ses,
1060 struct TCP_Server_Info *server,
1061 const struct nls_table *nls_cp)
1062 {
1063 int rc = 0;
1064 NEGOTIATE_MESSAGE *sec_blob;
1065 __u32 flags;
1066 unsigned char *tmp;
1067 int len;
1068
1069 len = size_of_ntlmssp_blob(ses, sizeof(NEGOTIATE_MESSAGE));
1070 *pbuffer = kmalloc(len, GFP_KERNEL);
1071 if (!*pbuffer) {
1072 rc = -ENOMEM;
1073 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
1074 *buflen = 0;
1075 goto setup_ntlm_neg_ret;
1076 }
1077 sec_blob = (NEGOTIATE_MESSAGE *)*pbuffer;
1078
1079 memset(*pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
1080 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
1081 sec_blob->MessageType = NtLmNegotiate;
1082
1083 /* BB is NTLMV2 session security format easier to use here? */
1084 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
1085 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
1086 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
1087 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
1088 NTLMSSP_NEGOTIATE_SIGN;
1089 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
1090 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
1091
1092 tmp = *pbuffer + sizeof(NEGOTIATE_MESSAGE);
1093 ses->ntlmssp->client_flags = flags;
1094 sec_blob->NegotiateFlags = cpu_to_le32(flags);
1095
1096 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
1097 cifs_security_buffer_from_str(&sec_blob->DomainName,
1098 NULL,
1099 CIFS_MAX_DOMAINNAME_LEN,
1100 *pbuffer, &tmp,
1101 nls_cp);
1102
1103 cifs_security_buffer_from_str(&sec_blob->WorkstationName,
1104 NULL,
1105 CIFS_MAX_WORKSTATION_LEN,
1106 *pbuffer, &tmp,
1107 nls_cp);
1108
1109 *buflen = tmp - *pbuffer;
1110 setup_ntlm_neg_ret:
1111 return rc;
1112 }
1113
1114 /*
1115 * Build ntlmssp blob with additional fields, such as version,
1116 * supported by modern servers. For safety limit to SMB3 or later
1117 * See notes in MS-NLMP Section 2.2.2.1 e.g.
1118 */
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)1119 int build_ntlmssp_smb3_negotiate_blob(unsigned char **pbuffer,
1120 u16 *buflen,
1121 struct cifs_ses *ses,
1122 struct TCP_Server_Info *server,
1123 const struct nls_table *nls_cp)
1124 {
1125 int rc = 0;
1126 struct negotiate_message *sec_blob;
1127 __u32 flags;
1128 unsigned char *tmp;
1129 int len;
1130
1131 len = size_of_ntlmssp_blob(ses, sizeof(struct negotiate_message));
1132 *pbuffer = kmalloc(len, GFP_KERNEL);
1133 if (!*pbuffer) {
1134 rc = -ENOMEM;
1135 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
1136 *buflen = 0;
1137 goto setup_ntlm_smb3_neg_ret;
1138 }
1139 sec_blob = (struct negotiate_message *)*pbuffer;
1140
1141 memset(*pbuffer, 0, sizeof(struct negotiate_message));
1142 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
1143 sec_blob->MessageType = NtLmNegotiate;
1144
1145 /* BB is NTLMV2 session security format easier to use here? */
1146 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
1147 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
1148 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
1149 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
1150 NTLMSSP_NEGOTIATE_SIGN | NTLMSSP_NEGOTIATE_VERSION;
1151 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
1152 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
1153
1154 sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR;
1155 sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL;
1156 sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD);
1157 sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
1158
1159 tmp = *pbuffer + sizeof(struct negotiate_message);
1160 ses->ntlmssp->client_flags = flags;
1161 sec_blob->NegotiateFlags = cpu_to_le32(flags);
1162
1163 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
1164 cifs_security_buffer_from_str(&sec_blob->DomainName,
1165 NULL,
1166 CIFS_MAX_DOMAINNAME_LEN,
1167 *pbuffer, &tmp,
1168 nls_cp);
1169
1170 cifs_security_buffer_from_str(&sec_blob->WorkstationName,
1171 NULL,
1172 CIFS_MAX_WORKSTATION_LEN,
1173 *pbuffer, &tmp,
1174 nls_cp);
1175
1176 *buflen = tmp - *pbuffer;
1177 setup_ntlm_smb3_neg_ret:
1178 return rc;
1179 }
1180
1181
1182 /* 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)1183 int build_ntlmssp_auth_blob(unsigned char **pbuffer,
1184 u16 *buflen,
1185 struct cifs_ses *ses,
1186 struct TCP_Server_Info *server,
1187 const struct nls_table *nls_cp)
1188 {
1189 int rc;
1190 AUTHENTICATE_MESSAGE *sec_blob;
1191 __u32 flags;
1192 unsigned char *tmp;
1193 int len;
1194
1195 rc = setup_ntlmv2_rsp(ses, nls_cp);
1196 if (rc) {
1197 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
1198 *buflen = 0;
1199 goto setup_ntlmv2_ret;
1200 }
1201
1202 len = size_of_ntlmssp_blob(ses, sizeof(AUTHENTICATE_MESSAGE));
1203 *pbuffer = kmalloc(len, GFP_KERNEL);
1204 if (!*pbuffer) {
1205 rc = -ENOMEM;
1206 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
1207 *buflen = 0;
1208 goto setup_ntlmv2_ret;
1209 }
1210 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
1211
1212 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
1213 sec_blob->MessageType = NtLmAuthenticate;
1214
1215 /* send version information in ntlmssp authenticate also */
1216 flags = ses->ntlmssp->server_flags | NTLMSSP_REQUEST_TARGET |
1217 NTLMSSP_NEGOTIATE_TARGET_INFO | NTLMSSP_NEGOTIATE_VERSION |
1218 NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED;
1219
1220 sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR;
1221 sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL;
1222 sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD);
1223 sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
1224
1225 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
1226 sec_blob->NegotiateFlags = cpu_to_le32(flags);
1227
1228 sec_blob->LmChallengeResponse.BufferOffset =
1229 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
1230 sec_blob->LmChallengeResponse.Length = 0;
1231 sec_blob->LmChallengeResponse.MaximumLength = 0;
1232
1233 sec_blob->NtChallengeResponse.BufferOffset =
1234 cpu_to_le32(tmp - *pbuffer);
1235 if (ses->user_name != NULL) {
1236 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1237 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1238 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1239
1240 sec_blob->NtChallengeResponse.Length =
1241 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1242 sec_blob->NtChallengeResponse.MaximumLength =
1243 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1244 } else {
1245 /*
1246 * don't send an NT Response for anonymous access
1247 */
1248 sec_blob->NtChallengeResponse.Length = 0;
1249 sec_blob->NtChallengeResponse.MaximumLength = 0;
1250 }
1251
1252 cifs_security_buffer_from_str(&sec_blob->DomainName,
1253 ses->domainName,
1254 CIFS_MAX_DOMAINNAME_LEN,
1255 *pbuffer, &tmp,
1256 nls_cp);
1257
1258 cifs_security_buffer_from_str(&sec_blob->UserName,
1259 ses->user_name,
1260 CIFS_MAX_USERNAME_LEN,
1261 *pbuffer, &tmp,
1262 nls_cp);
1263
1264 cifs_security_buffer_from_str(&sec_blob->WorkstationName,
1265 ses->workstation_name,
1266 ntlmssp_workstation_name_size(ses),
1267 *pbuffer, &tmp,
1268 nls_cp);
1269
1270 if ((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
1271 (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess) &&
1272 !calc_seckey(ses)) {
1273 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
1274 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
1275 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
1276 sec_blob->SessionKey.MaximumLength =
1277 cpu_to_le16(CIFS_CPHTXT_SIZE);
1278 tmp += CIFS_CPHTXT_SIZE;
1279 } else {
1280 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
1281 sec_blob->SessionKey.Length = 0;
1282 sec_blob->SessionKey.MaximumLength = 0;
1283 }
1284
1285 *buflen = tmp - *pbuffer;
1286 setup_ntlmv2_ret:
1287 return rc;
1288 }
1289
1290 enum securityEnum
cifs_select_sectype(struct TCP_Server_Info * server,enum securityEnum requested)1291 cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1292 {
1293 switch (server->negflavor) {
1294 case CIFS_NEGFLAVOR_EXTENDED:
1295 switch (requested) {
1296 case Kerberos:
1297 case RawNTLMSSP:
1298 return requested;
1299 case Unspecified:
1300 if (server->sec_ntlmssp &&
1301 (global_secflags & CIFSSEC_MAY_NTLMSSP))
1302 return RawNTLMSSP;
1303 if ((server->sec_kerberos || server->sec_mskerberos) &&
1304 (global_secflags & CIFSSEC_MAY_KRB5))
1305 return Kerberos;
1306 fallthrough;
1307 default:
1308 return Unspecified;
1309 }
1310 case CIFS_NEGFLAVOR_UNENCAP:
1311 switch (requested) {
1312 case NTLMv2:
1313 return requested;
1314 case Unspecified:
1315 if (global_secflags & CIFSSEC_MAY_NTLMV2)
1316 return NTLMv2;
1317 break;
1318 default:
1319 break;
1320 }
1321 fallthrough;
1322 default:
1323 return Unspecified;
1324 }
1325 }
1326
1327 struct sess_data {
1328 unsigned int xid;
1329 struct cifs_ses *ses;
1330 struct TCP_Server_Info *server;
1331 struct nls_table *nls_cp;
1332 void (*func)(struct sess_data *);
1333 int result;
1334
1335 /* we will send the SMB in three pieces:
1336 * a fixed length beginning part, an optional
1337 * SPNEGO blob (which can be zero length), and a
1338 * last part which will include the strings
1339 * and rest of bcc area. This allows us to avoid
1340 * a large buffer 17K allocation
1341 */
1342 int buf0_type;
1343 struct kvec iov[3];
1344 };
1345
1346 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1347 static int
sess_alloc_buffer(struct sess_data * sess_data,int wct)1348 sess_alloc_buffer(struct sess_data *sess_data, int wct)
1349 {
1350 int rc;
1351 struct cifs_ses *ses = sess_data->ses;
1352 struct smb_hdr *smb_buf;
1353
1354 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
1355 (void **)&smb_buf);
1356
1357 if (rc)
1358 return rc;
1359
1360 sess_data->iov[0].iov_base = (char *)smb_buf;
1361 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
1362 /*
1363 * This variable will be used to clear the buffer
1364 * allocated above in case of any error in the calling function.
1365 */
1366 sess_data->buf0_type = CIFS_SMALL_BUFFER;
1367
1368 /* 2000 big enough to fit max user, domain, NOS name etc. */
1369 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
1370 if (!sess_data->iov[2].iov_base) {
1371 rc = -ENOMEM;
1372 goto out_free_smb_buf;
1373 }
1374
1375 return 0;
1376
1377 out_free_smb_buf:
1378 cifs_small_buf_release(smb_buf);
1379 sess_data->iov[0].iov_base = NULL;
1380 sess_data->iov[0].iov_len = 0;
1381 sess_data->buf0_type = CIFS_NO_BUFFER;
1382 return rc;
1383 }
1384
1385 static void
sess_free_buffer(struct sess_data * sess_data)1386 sess_free_buffer(struct sess_data *sess_data)
1387 {
1388 struct kvec *iov = sess_data->iov;
1389
1390 /*
1391 * Zero the session data before freeing, as it might contain sensitive info (keys, etc).
1392 * Note that iov[1] is already freed by caller.
1393 */
1394 if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
1395 memzero_explicit(iov[0].iov_base, iov[0].iov_len);
1396
1397 free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
1398 sess_data->buf0_type = CIFS_NO_BUFFER;
1399 kfree_sensitive(iov[2].iov_base);
1400 }
1401
1402 static int
sess_establish_session(struct sess_data * sess_data)1403 sess_establish_session(struct sess_data *sess_data)
1404 {
1405 struct cifs_ses *ses = sess_data->ses;
1406 struct TCP_Server_Info *server = sess_data->server;
1407
1408 cifs_server_lock(server);
1409 if (!server->session_estab) {
1410 if (server->sign) {
1411 server->session_key.response =
1412 kmemdup(ses->auth_key.response,
1413 ses->auth_key.len, GFP_KERNEL);
1414 if (!server->session_key.response) {
1415 cifs_server_unlock(server);
1416 return -ENOMEM;
1417 }
1418 server->session_key.len =
1419 ses->auth_key.len;
1420 }
1421 server->sequence_number = 0x2;
1422 server->session_estab = true;
1423 }
1424 cifs_server_unlock(server);
1425
1426 cifs_dbg(FYI, "CIFS session established successfully\n");
1427 return 0;
1428 }
1429
1430 static int
sess_sendreceive(struct sess_data * sess_data)1431 sess_sendreceive(struct sess_data *sess_data)
1432 {
1433 int rc;
1434 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
1435 __u16 count;
1436 struct kvec rsp_iov = { NULL, 0 };
1437
1438 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
1439 be32_add_cpu(&smb_buf->smb_buf_length, count);
1440 put_bcc(count, smb_buf);
1441
1442 rc = SendReceive2(sess_data->xid, sess_data->ses,
1443 sess_data->iov, 3 /* num_iovecs */,
1444 &sess_data->buf0_type,
1445 CIFS_LOG_ERROR, &rsp_iov);
1446 cifs_small_buf_release(sess_data->iov[0].iov_base);
1447 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1448
1449 return rc;
1450 }
1451
1452 static void
sess_auth_ntlmv2(struct sess_data * sess_data)1453 sess_auth_ntlmv2(struct sess_data *sess_data)
1454 {
1455 int rc = 0;
1456 struct smb_hdr *smb_buf;
1457 SESSION_SETUP_ANDX *pSMB;
1458 char *bcc_ptr;
1459 struct cifs_ses *ses = sess_data->ses;
1460 struct TCP_Server_Info *server = sess_data->server;
1461 __u32 capabilities;
1462 __u16 bytes_remaining;
1463
1464 /* old style NTLM sessionsetup */
1465 /* wct = 13 */
1466 rc = sess_alloc_buffer(sess_data, 13);
1467 if (rc)
1468 goto out;
1469
1470 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1471 bcc_ptr = sess_data->iov[2].iov_base;
1472 capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1473
1474 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
1475
1476 /* LM2 password would be here if we supported it */
1477 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
1478
1479 if (ses->user_name != NULL) {
1480 /* calculate nlmv2 response and session key */
1481 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
1482 if (rc) {
1483 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
1484 goto out;
1485 }
1486
1487 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1488 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1489 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1490
1491 /* set case sensitive password length after tilen may get
1492 * assigned, tilen is 0 otherwise.
1493 */
1494 pSMB->req_no_secext.CaseSensitivePasswordLength =
1495 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1496 } else {
1497 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
1498 }
1499
1500 if (ses->capabilities & CAP_UNICODE) {
1501 if (!IS_ALIGNED(sess_data->iov[0].iov_len, 2)) {
1502 *bcc_ptr = 0;
1503 bcc_ptr++;
1504 }
1505 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1506 } else {
1507 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1508 }
1509
1510
1511 sess_data->iov[2].iov_len = (long) bcc_ptr -
1512 (long) sess_data->iov[2].iov_base;
1513
1514 rc = sess_sendreceive(sess_data);
1515 if (rc)
1516 goto out;
1517
1518 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1519 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1520
1521 if (smb_buf->WordCount != 3) {
1522 rc = -EIO;
1523 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1524 goto out;
1525 }
1526
1527 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1528 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1529
1530 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1531 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1532
1533 bytes_remaining = get_bcc(smb_buf);
1534 bcc_ptr = pByteArea(smb_buf);
1535
1536 /* BB check if Unicode and decode strings */
1537 if (bytes_remaining == 0) {
1538 /* no string area to decode, do nothing */
1539 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1540 /* unicode string area must be word-aligned */
1541 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1542 ++bcc_ptr;
1543 --bytes_remaining;
1544 }
1545 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1546 sess_data->nls_cp);
1547 } else {
1548 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1549 sess_data->nls_cp);
1550 }
1551
1552 rc = sess_establish_session(sess_data);
1553 out:
1554 sess_data->result = rc;
1555 sess_data->func = NULL;
1556 sess_free_buffer(sess_data);
1557 kfree_sensitive(ses->auth_key.response);
1558 ses->auth_key.response = NULL;
1559 }
1560
1561 #ifdef CONFIG_CIFS_UPCALL
1562 static void
sess_auth_kerberos(struct sess_data * sess_data)1563 sess_auth_kerberos(struct sess_data *sess_data)
1564 {
1565 int rc = 0;
1566 struct smb_hdr *smb_buf;
1567 SESSION_SETUP_ANDX *pSMB;
1568 char *bcc_ptr;
1569 struct cifs_ses *ses = sess_data->ses;
1570 struct TCP_Server_Info *server = sess_data->server;
1571 __u32 capabilities;
1572 __u16 bytes_remaining;
1573 struct key *spnego_key = NULL;
1574 struct cifs_spnego_msg *msg;
1575 u16 blob_len;
1576
1577 /* extended security */
1578 /* wct = 12 */
1579 rc = sess_alloc_buffer(sess_data, 12);
1580 if (rc)
1581 goto out;
1582
1583 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1584 bcc_ptr = sess_data->iov[2].iov_base;
1585 capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1586
1587 spnego_key = cifs_get_spnego_key(ses, server);
1588 if (IS_ERR(spnego_key)) {
1589 rc = PTR_ERR(spnego_key);
1590 spnego_key = NULL;
1591 goto out;
1592 }
1593
1594 msg = spnego_key->payload.data[0];
1595 /*
1596 * check version field to make sure that cifs.upcall is
1597 * sending us a response in an expected form
1598 */
1599 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1600 cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n",
1601 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1602 rc = -EKEYREJECTED;
1603 goto out_put_spnego_key;
1604 }
1605
1606 kfree_sensitive(ses->auth_key.response);
1607 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1608 GFP_KERNEL);
1609 if (!ses->auth_key.response) {
1610 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1611 msg->sesskey_len);
1612 rc = -ENOMEM;
1613 goto out_put_spnego_key;
1614 }
1615 ses->auth_key.len = msg->sesskey_len;
1616
1617 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1618 capabilities |= CAP_EXTENDED_SECURITY;
1619 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1620 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1621 sess_data->iov[1].iov_len = msg->secblob_len;
1622 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1623
1624 if (ses->capabilities & CAP_UNICODE) {
1625 /* unicode strings must be word aligned */
1626 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
1627 *bcc_ptr = 0;
1628 bcc_ptr++;
1629 }
1630 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1631 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1632 } else {
1633 /* BB: is this right? */
1634 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1635 }
1636
1637 sess_data->iov[2].iov_len = (long) bcc_ptr -
1638 (long) sess_data->iov[2].iov_base;
1639
1640 rc = sess_sendreceive(sess_data);
1641 if (rc)
1642 goto out_put_spnego_key;
1643
1644 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1645 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1646
1647 if (smb_buf->WordCount != 4) {
1648 rc = -EIO;
1649 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1650 goto out_put_spnego_key;
1651 }
1652
1653 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1654 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1655
1656 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1657 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1658
1659 bytes_remaining = get_bcc(smb_buf);
1660 bcc_ptr = pByteArea(smb_buf);
1661
1662 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1663 if (blob_len > bytes_remaining) {
1664 cifs_dbg(VFS, "bad security blob length %d\n",
1665 blob_len);
1666 rc = -EINVAL;
1667 goto out_put_spnego_key;
1668 }
1669 bcc_ptr += blob_len;
1670 bytes_remaining -= blob_len;
1671
1672 /* BB check if Unicode and decode strings */
1673 if (bytes_remaining == 0) {
1674 /* no string area to decode, do nothing */
1675 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1676 /* unicode string area must be word-aligned */
1677 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1678 ++bcc_ptr;
1679 --bytes_remaining;
1680 }
1681 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1682 sess_data->nls_cp);
1683 } else {
1684 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1685 sess_data->nls_cp);
1686 }
1687
1688 rc = sess_establish_session(sess_data);
1689 out_put_spnego_key:
1690 key_invalidate(spnego_key);
1691 key_put(spnego_key);
1692 out:
1693 sess_data->result = rc;
1694 sess_data->func = NULL;
1695 sess_free_buffer(sess_data);
1696 kfree_sensitive(ses->auth_key.response);
1697 ses->auth_key.response = NULL;
1698 }
1699
1700 #endif /* ! CONFIG_CIFS_UPCALL */
1701
1702 /*
1703 * The required kvec buffers have to be allocated before calling this
1704 * function.
1705 */
1706 static int
_sess_auth_rawntlmssp_assemble_req(struct sess_data * sess_data)1707 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1708 {
1709 SESSION_SETUP_ANDX *pSMB;
1710 struct cifs_ses *ses = sess_data->ses;
1711 struct TCP_Server_Info *server = sess_data->server;
1712 __u32 capabilities;
1713 char *bcc_ptr;
1714
1715 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1716
1717 capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1718 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1719 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1720 return -ENOSYS;
1721 }
1722
1723 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1724 capabilities |= CAP_EXTENDED_SECURITY;
1725 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1726
1727 bcc_ptr = sess_data->iov[2].iov_base;
1728 /* unicode strings must be word aligned */
1729 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
1730 *bcc_ptr = 0;
1731 bcc_ptr++;
1732 }
1733 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1734
1735 sess_data->iov[2].iov_len = (long) bcc_ptr -
1736 (long) sess_data->iov[2].iov_base;
1737
1738 return 0;
1739 }
1740
1741 static void
1742 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1743
1744 static void
sess_auth_rawntlmssp_negotiate(struct sess_data * sess_data)1745 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1746 {
1747 int rc;
1748 struct smb_hdr *smb_buf;
1749 SESSION_SETUP_ANDX *pSMB;
1750 struct cifs_ses *ses = sess_data->ses;
1751 struct TCP_Server_Info *server = sess_data->server;
1752 __u16 bytes_remaining;
1753 char *bcc_ptr;
1754 unsigned char *ntlmsspblob = NULL;
1755 u16 blob_len;
1756
1757 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1758
1759 /*
1760 * if memory allocation is successful, caller of this function
1761 * frees it.
1762 */
1763 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1764 if (!ses->ntlmssp) {
1765 rc = -ENOMEM;
1766 goto out;
1767 }
1768 ses->ntlmssp->sesskey_per_smbsess = false;
1769
1770 /* wct = 12 */
1771 rc = sess_alloc_buffer(sess_data, 12);
1772 if (rc)
1773 goto out;
1774
1775 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1776
1777 /* Build security blob before we assemble the request */
1778 rc = build_ntlmssp_negotiate_blob(&ntlmsspblob,
1779 &blob_len, ses, server,
1780 sess_data->nls_cp);
1781 if (rc)
1782 goto out_free_ntlmsspblob;
1783
1784 sess_data->iov[1].iov_len = blob_len;
1785 sess_data->iov[1].iov_base = ntlmsspblob;
1786 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1787
1788 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1789 if (rc)
1790 goto out_free_ntlmsspblob;
1791
1792 rc = sess_sendreceive(sess_data);
1793
1794 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1795 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1796
1797 /* If true, rc here is expected and not an error */
1798 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1799 smb_buf->Status.CifsError ==
1800 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1801 rc = 0;
1802
1803 if (rc)
1804 goto out_free_ntlmsspblob;
1805
1806 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1807
1808 if (smb_buf->WordCount != 4) {
1809 rc = -EIO;
1810 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1811 goto out_free_ntlmsspblob;
1812 }
1813
1814 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1815 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1816
1817 bytes_remaining = get_bcc(smb_buf);
1818 bcc_ptr = pByteArea(smb_buf);
1819
1820 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1821 if (blob_len > bytes_remaining) {
1822 cifs_dbg(VFS, "bad security blob length %d\n",
1823 blob_len);
1824 rc = -EINVAL;
1825 goto out_free_ntlmsspblob;
1826 }
1827
1828 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1829
1830 out_free_ntlmsspblob:
1831 kfree_sensitive(ntlmsspblob);
1832 out:
1833 sess_free_buffer(sess_data);
1834
1835 if (!rc) {
1836 sess_data->func = sess_auth_rawntlmssp_authenticate;
1837 return;
1838 }
1839
1840 /* Else error. Cleanup */
1841 kfree_sensitive(ses->auth_key.response);
1842 ses->auth_key.response = NULL;
1843 kfree_sensitive(ses->ntlmssp);
1844 ses->ntlmssp = NULL;
1845
1846 sess_data->func = NULL;
1847 sess_data->result = rc;
1848 }
1849
1850 static void
sess_auth_rawntlmssp_authenticate(struct sess_data * sess_data)1851 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1852 {
1853 int rc;
1854 struct smb_hdr *smb_buf;
1855 SESSION_SETUP_ANDX *pSMB;
1856 struct cifs_ses *ses = sess_data->ses;
1857 struct TCP_Server_Info *server = sess_data->server;
1858 __u16 bytes_remaining;
1859 char *bcc_ptr;
1860 unsigned char *ntlmsspblob = NULL;
1861 u16 blob_len;
1862
1863 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1864
1865 /* wct = 12 */
1866 rc = sess_alloc_buffer(sess_data, 12);
1867 if (rc)
1868 goto out;
1869
1870 /* Build security blob before we assemble the request */
1871 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1872 smb_buf = (struct smb_hdr *)pSMB;
1873 rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1874 &blob_len, ses, server,
1875 sess_data->nls_cp);
1876 if (rc)
1877 goto out_free_ntlmsspblob;
1878 sess_data->iov[1].iov_len = blob_len;
1879 sess_data->iov[1].iov_base = ntlmsspblob;
1880 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1881 /*
1882 * Make sure that we tell the server that we are using
1883 * the uid that it just gave us back on the response
1884 * (challenge)
1885 */
1886 smb_buf->Uid = ses->Suid;
1887
1888 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1889 if (rc)
1890 goto out_free_ntlmsspblob;
1891
1892 rc = sess_sendreceive(sess_data);
1893 if (rc)
1894 goto out_free_ntlmsspblob;
1895
1896 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1897 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1898 if (smb_buf->WordCount != 4) {
1899 rc = -EIO;
1900 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1901 goto out_free_ntlmsspblob;
1902 }
1903
1904 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1905 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1906
1907 if (ses->Suid != smb_buf->Uid) {
1908 ses->Suid = smb_buf->Uid;
1909 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1910 }
1911
1912 bytes_remaining = get_bcc(smb_buf);
1913 bcc_ptr = pByteArea(smb_buf);
1914 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1915 if (blob_len > bytes_remaining) {
1916 cifs_dbg(VFS, "bad security blob length %d\n",
1917 blob_len);
1918 rc = -EINVAL;
1919 goto out_free_ntlmsspblob;
1920 }
1921 bcc_ptr += blob_len;
1922 bytes_remaining -= blob_len;
1923
1924
1925 /* BB check if Unicode and decode strings */
1926 if (bytes_remaining == 0) {
1927 /* no string area to decode, do nothing */
1928 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1929 /* unicode string area must be word-aligned */
1930 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1931 ++bcc_ptr;
1932 --bytes_remaining;
1933 }
1934 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1935 sess_data->nls_cp);
1936 } else {
1937 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1938 sess_data->nls_cp);
1939 }
1940
1941 out_free_ntlmsspblob:
1942 kfree_sensitive(ntlmsspblob);
1943 out:
1944 sess_free_buffer(sess_data);
1945
1946 if (!rc)
1947 rc = sess_establish_session(sess_data);
1948
1949 /* Cleanup */
1950 kfree_sensitive(ses->auth_key.response);
1951 ses->auth_key.response = NULL;
1952 kfree_sensitive(ses->ntlmssp);
1953 ses->ntlmssp = NULL;
1954
1955 sess_data->func = NULL;
1956 sess_data->result = rc;
1957 }
1958
select_sec(struct sess_data * sess_data)1959 static int select_sec(struct sess_data *sess_data)
1960 {
1961 int type;
1962 struct cifs_ses *ses = sess_data->ses;
1963 struct TCP_Server_Info *server = sess_data->server;
1964
1965 type = cifs_select_sectype(server, ses->sectype);
1966 cifs_dbg(FYI, "sess setup type %d\n", type);
1967 if (type == Unspecified) {
1968 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1969 return -EINVAL;
1970 }
1971
1972 switch (type) {
1973 case NTLMv2:
1974 sess_data->func = sess_auth_ntlmv2;
1975 break;
1976 case Kerberos:
1977 #ifdef CONFIG_CIFS_UPCALL
1978 sess_data->func = sess_auth_kerberos;
1979 break;
1980 #else
1981 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1982 return -ENOSYS;
1983 #endif /* CONFIG_CIFS_UPCALL */
1984 case RawNTLMSSP:
1985 sess_data->func = sess_auth_rawntlmssp_negotiate;
1986 break;
1987 default:
1988 cifs_dbg(VFS, "secType %d not supported!\n", type);
1989 return -ENOSYS;
1990 }
1991
1992 return 0;
1993 }
1994
CIFS_SessSetup(const unsigned int xid,struct cifs_ses * ses,struct TCP_Server_Info * server,const struct nls_table * nls_cp)1995 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1996 struct TCP_Server_Info *server,
1997 const struct nls_table *nls_cp)
1998 {
1999 int rc = 0;
2000 struct sess_data *sess_data;
2001
2002 if (ses == NULL) {
2003 WARN(1, "%s: ses == NULL!", __func__);
2004 return -EINVAL;
2005 }
2006
2007 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
2008 if (!sess_data)
2009 return -ENOMEM;
2010
2011 sess_data->xid = xid;
2012 sess_data->ses = ses;
2013 sess_data->server = server;
2014 sess_data->buf0_type = CIFS_NO_BUFFER;
2015 sess_data->nls_cp = (struct nls_table *) nls_cp;
2016
2017 rc = select_sec(sess_data);
2018 if (rc)
2019 goto out;
2020
2021 while (sess_data->func)
2022 sess_data->func(sess_data);
2023
2024 /* Store result before we free sess_data */
2025 rc = sess_data->result;
2026
2027 out:
2028 kfree_sensitive(sess_data);
2029 return rc;
2030 }
2031 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2032