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