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