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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
26static int
27cifs_ses_add_channel(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
28 struct cifs_server_iface *iface);
29
30bool
31is_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
55bool 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
72unsigned int
73cifs_ses_get_chan_index(struct cifs_ses *ses,
74 struct TCP_Server_Info *server)
75{
76 unsigned int i;
77
78 for (i = 0; i < ses->chan_count; i++) {
79 if (ses->chans[i].server == server)
80 return i;
81 }
82
83 /* If we didn't find the channel, it is likely a bug */
84 if (server)
85 cifs_dbg(VFS, "unable to get chan index for server: 0x%llx",
86 server->conn_id);
87 WARN_ON(1);
88 return 0;
89}
90
91void
92cifs_chan_set_in_reconnect(struct cifs_ses *ses,
93 struct TCP_Server_Info *server)
94{
95 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
96
97 ses->chans[chan_index].in_reconnect = true;
98}
99
100void
101cifs_chan_clear_in_reconnect(struct cifs_ses *ses,
102 struct TCP_Server_Info *server)
103{
104 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
105
106 ses->chans[chan_index].in_reconnect = false;
107}
108
109bool
110cifs_chan_in_reconnect(struct cifs_ses *ses,
111 struct TCP_Server_Info *server)
112{
113 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
114
115 return CIFS_CHAN_IN_RECONNECT(ses, chan_index);
116}
117
118void
119cifs_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 set_bit(chan_index, &ses->chans_need_reconnect);
125 cifs_dbg(FYI, "Set reconnect bitmask for chan %u; now 0x%lx\n",
126 chan_index, ses->chans_need_reconnect);
127}
128
129void
130cifs_chan_clear_need_reconnect(struct cifs_ses *ses,
131 struct TCP_Server_Info *server)
132{
133 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
134
135 clear_bit(chan_index, &ses->chans_need_reconnect);
136 cifs_dbg(FYI, "Cleared reconnect bitmask for chan %u; now 0x%lx\n",
137 chan_index, ses->chans_need_reconnect);
138}
139
140bool
141cifs_chan_needs_reconnect(struct cifs_ses *ses,
142 struct TCP_Server_Info *server)
143{
144 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
145
146 return CIFS_CHAN_NEEDS_RECONNECT(ses, chan_index);
147}
148
149bool
150cifs_chan_is_iface_active(struct cifs_ses *ses,
151 struct TCP_Server_Info *server)
152{
153 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
154
155 return ses->chans[chan_index].iface &&
156 ses->chans[chan_index].iface->is_active;
157}
158
159/* returns number of channels added */
160int cifs_try_adding_channels(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses)
161{
162 int old_chan_count, new_chan_count;
163 int left;
164 int rc = 0;
165 int tries = 0;
166 struct cifs_server_iface *iface = NULL, *niface = NULL;
167
168 spin_lock(&ses->chan_lock);
169
170 new_chan_count = old_chan_count = ses->chan_count;
171 left = ses->chan_max - ses->chan_count;
172
173 if (left <= 0) {
174 spin_unlock(&ses->chan_lock);
175 cifs_dbg(FYI,
176 "ses already at max_channels (%zu), nothing to open\n",
177 ses->chan_max);
178 return 0;
179 }
180
181 if (ses->server->dialect < SMB30_PROT_ID) {
182 spin_unlock(&ses->chan_lock);
183 cifs_dbg(VFS, "multichannel is not supported on this protocol version, use 3.0 or above\n");
184 return 0;
185 }
186
187 if (!(ses->server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
188 ses->chan_max = 1;
189 spin_unlock(&ses->chan_lock);
190 cifs_dbg(VFS, "server %s does not support multichannel\n", ses->server->hostname);
191 return 0;
192 }
193 spin_unlock(&ses->chan_lock);
194
195 /*
196 * Keep connecting to same, fastest, iface for all channels as
197 * long as its RSS. Try next fastest one if not RSS or channel
198 * creation fails.
199 */
200 spin_lock(&ses->iface_lock);
201 iface = list_first_entry(&ses->iface_list, struct cifs_server_iface,
202 iface_head);
203 spin_unlock(&ses->iface_lock);
204
205 while (left > 0) {
206
207 tries++;
208 if (tries > 3*ses->chan_max) {
209 cifs_dbg(FYI, "too many channel open attempts (%d channels left to open)\n",
210 left);
211 break;
212 }
213
214 spin_lock(&ses->iface_lock);
215 if (!ses->iface_count) {
216 spin_unlock(&ses->iface_lock);
217 break;
218 }
219
220 list_for_each_entry_safe_from(iface, niface, &ses->iface_list,
221 iface_head) {
222 /* skip ifaces that are unusable */
223 if (!iface->is_active ||
224 (is_ses_using_iface(ses, iface) &&
225 !iface->rss_capable)) {
226 continue;
227 }
228
229 /* take ref before unlock */
230 kref_get(&iface->refcount);
231
232 spin_unlock(&ses->iface_lock);
233 rc = cifs_ses_add_channel(cifs_sb, ses, iface);
234 spin_lock(&ses->iface_lock);
235
236 if (rc) {
237 cifs_dbg(VFS, "failed to open extra channel on iface:%pIS rc=%d\n",
238 &iface->sockaddr,
239 rc);
240 kref_put(&iface->refcount, release_iface);
241 continue;
242 }
243
244 cifs_dbg(FYI, "successfully opened new channel on iface:%pIS\n",
245 &iface->sockaddr);
246 break;
247 }
248 spin_unlock(&ses->iface_lock);
249
250 left--;
251 new_chan_count++;
252 }
253
254 return new_chan_count - old_chan_count;
255}
256
257/*
258 * update the iface for the channel if necessary.
259 * will return 0 when iface is updated, 1 if removed, 2 otherwise
260 * Must be called with chan_lock held.
261 */
262int
263cifs_chan_update_iface(struct cifs_ses *ses, struct TCP_Server_Info *server)
264{
265 unsigned int chan_index;
266 struct cifs_server_iface *iface = NULL;
267 struct cifs_server_iface *old_iface = NULL;
268 int rc = 0;
269
270 spin_lock(&ses->chan_lock);
271 chan_index = cifs_ses_get_chan_index(ses, server);
272 if (!chan_index) {
273 spin_unlock(&ses->chan_lock);
274 return 0;
275 }
276
277 if (ses->chans[chan_index].iface) {
278 old_iface = ses->chans[chan_index].iface;
279 if (old_iface->is_active) {
280 spin_unlock(&ses->chan_lock);
281 return 1;
282 }
283 }
284 spin_unlock(&ses->chan_lock);
285
286 spin_lock(&ses->iface_lock);
287 /* then look for a new one */
288 list_for_each_entry(iface, &ses->iface_list, iface_head) {
289 if (!iface->is_active ||
290 (is_ses_using_iface(ses, iface) &&
291 !iface->rss_capable)) {
292 continue;
293 }
294 kref_get(&iface->refcount);
295 break;
296 }
297
298 if (list_entry_is_head(iface, &ses->iface_list, iface_head)) {
299 rc = 1;
300 iface = NULL;
301 cifs_dbg(FYI, "unable to find a suitable iface\n");
302 }
303
304 /* now drop the ref to the current iface */
305 if (old_iface && iface) {
306 cifs_dbg(FYI, "replacing iface: %pIS with %pIS\n",
307 &old_iface->sockaddr,
308 &iface->sockaddr);
309 kref_put(&old_iface->refcount, release_iface);
310 } else if (old_iface) {
311 cifs_dbg(FYI, "releasing ref to iface: %pIS\n",
312 &old_iface->sockaddr);
313 kref_put(&old_iface->refcount, release_iface);
314 } else {
315 WARN_ON(!iface);
316 cifs_dbg(FYI, "adding new iface: %pIS\n", &iface->sockaddr);
317 }
318 spin_unlock(&ses->iface_lock);
319
320 spin_lock(&ses->chan_lock);
321 chan_index = cifs_ses_get_chan_index(ses, server);
322 ses->chans[chan_index].iface = iface;
323
324 /* No iface is found. if secondary chan, drop connection */
325 if (!iface && CIFS_SERVER_IS_CHAN(server))
326 ses->chans[chan_index].server = NULL;
327
328 spin_unlock(&ses->chan_lock);
329
330 if (!iface && CIFS_SERVER_IS_CHAN(server))
331 cifs_put_tcp_session(server, false);
332
333 return rc;
334}
335
336/*
337 * If server is a channel of ses, return the corresponding enclosing
338 * cifs_chan otherwise return NULL.
339 */
340struct cifs_chan *
341cifs_ses_find_chan(struct cifs_ses *ses, struct TCP_Server_Info *server)
342{
343 int i;
344
345 spin_lock(&ses->chan_lock);
346 for (i = 0; i < ses->chan_count; i++) {
347 if (ses->chans[i].server == server) {
348 spin_unlock(&ses->chan_lock);
349 return &ses->chans[i];
350 }
351 }
352 spin_unlock(&ses->chan_lock);
353 return NULL;
354}
355
356static int
357cifs_ses_add_channel(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
358 struct cifs_server_iface *iface)
359{
360 struct TCP_Server_Info *chan_server;
361 struct cifs_chan *chan;
362 struct smb3_fs_context ctx = {NULL};
363 static const char unc_fmt[] = "\\%s\\foo";
364 char unc[sizeof(unc_fmt)+SERVER_NAME_LEN_WITH_NULL] = {0};
365 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;
366 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;
367 int rc;
368 unsigned int xid = get_xid();
369
370 if (iface->sockaddr.ss_family == AF_INET)
371 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI4)\n",
372 ses, iface->speed, iface->rdma_capable ? "yes" : "no",
373 &ipv4->sin_addr);
374 else
375 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI6)\n",
376 ses, iface->speed, iface->rdma_capable ? "yes" : "no",
377 &ipv6->sin6_addr);
378
379 /*
380 * Setup a ctx with mostly the same info as the existing
381 * session and overwrite it with the requested iface data.
382 *
383 * We need to setup at least the fields used for negprot and
384 * sesssetup.
385 *
386 * We only need the ctx here, so we can reuse memory from
387 * the session and server without caring about memory
388 * management.
389 */
390
391 /* Always make new connection for now (TODO?) */
392 ctx.nosharesock = true;
393
394 /* Auth */
395 ctx.domainauto = ses->domainAuto;
396 ctx.domainname = ses->domainName;
397
398 /* no hostname for extra channels */
399 ctx.server_hostname = "";
400
401 ctx.username = ses->user_name;
402 ctx.password = ses->password;
403 ctx.sectype = ses->sectype;
404 ctx.sign = ses->sign;
405
406 /* UNC and paths */
407 /* XXX: Use ses->server->hostname? */
408 sprintf(unc, unc_fmt, ses->ip_addr);
409 ctx.UNC = unc;
410 ctx.prepath = "";
411
412 /* Reuse same version as master connection */
413 ctx.vals = ses->server->vals;
414 ctx.ops = ses->server->ops;
415
416 ctx.noblocksnd = ses->server->noblocksnd;
417 ctx.noautotune = ses->server->noautotune;
418 ctx.sockopt_tcp_nodelay = ses->server->tcp_nodelay;
419 ctx.echo_interval = ses->server->echo_interval / HZ;
420 ctx.max_credits = ses->server->max_credits;
421
422 /*
423 * This will be used for encoding/decoding user/domain/pw
424 * during sess setup auth.
425 */
426 ctx.local_nls = cifs_sb->local_nls;
427
428 /* Use RDMA if possible */
429 ctx.rdma = iface->rdma_capable;
430 memcpy(&ctx.dstaddr, &iface->sockaddr, sizeof(struct sockaddr_storage));
431
432 /* reuse master con client guid */
433 memcpy(&ctx.client_guid, ses->server->client_guid,
434 SMB2_CLIENT_GUID_SIZE);
435 ctx.use_client_guid = true;
436
437 chan_server = cifs_get_tcp_session(&ctx, ses->server);
438
439 spin_lock(&ses->chan_lock);
440 chan = &ses->chans[ses->chan_count];
441 chan->server = chan_server;
442 if (IS_ERR(chan->server)) {
443 rc = PTR_ERR(chan->server);
444 chan->server = NULL;
445 spin_unlock(&ses->chan_lock);
446 goto out;
447 }
448 chan->iface = iface;
449 ses->chan_count++;
450 atomic_set(&ses->chan_seq, 0);
451
452 /* Mark this channel as needing connect/setup */
453 cifs_chan_set_need_reconnect(ses, chan->server);
454
455 spin_unlock(&ses->chan_lock);
456
457 mutex_lock(&ses->session_mutex);
458 /*
459 * We need to allocate the server crypto now as we will need
460 * to sign packets before we generate the channel signing key
461 * (we sign with the session key)
462 */
463 rc = smb311_crypto_shash_allocate(chan->server);
464 if (rc) {
465 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
466 mutex_unlock(&ses->session_mutex);
467 goto out;
468 }
469
470 rc = cifs_negotiate_protocol(xid, ses, chan->server);
471 if (!rc)
472 rc = cifs_setup_session(xid, ses, chan->server, cifs_sb->local_nls);
473
474 mutex_unlock(&ses->session_mutex);
475
476out:
477 if (rc && chan->server) {
478 /*
479 * we should avoid race with these delayed works before we
480 * remove this channel
481 */
482 cancel_delayed_work_sync(&chan->server->echo);
483 cancel_delayed_work_sync(&chan->server->resolve);
484 cancel_delayed_work_sync(&chan->server->reconnect);
485
486 spin_lock(&ses->chan_lock);
487 /* we rely on all bits beyond chan_count to be clear */
488 cifs_chan_clear_need_reconnect(ses, chan->server);
489 ses->chan_count--;
490 /*
491 * chan_count should never reach 0 as at least the primary
492 * channel is always allocated
493 */
494 WARN_ON(ses->chan_count < 1);
495 spin_unlock(&ses->chan_lock);
496
497 cifs_put_tcp_session(chan->server, 0);
498 }
499
500 free_xid(xid);
501 return rc;
502}
503
504#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
505static __u32 cifs_ssetup_hdr(struct cifs_ses *ses,
506 struct TCP_Server_Info *server,
507 SESSION_SETUP_ANDX *pSMB)
508{
509 __u32 capabilities = 0;
510
511 /* init fields common to all four types of SessSetup */
512 /* Note that offsets for first seven fields in req struct are same */
513 /* in CIFS Specs so does not matter which of 3 forms of struct */
514 /* that we use in next few lines */
515 /* Note that header is initialized to zero in header_assemble */
516 pSMB->req.AndXCommand = 0xFF;
517 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
518 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
519 USHRT_MAX));
520 pSMB->req.MaxMpxCount = cpu_to_le16(server->maxReq);
521 pSMB->req.VcNumber = cpu_to_le16(1);
522
523 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
524
525 /* BB verify whether signing required on neg or just on auth frame
526 (and NTLM case) */
527
528 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
529 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
530
531 if (server->sign)
532 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
533
534 if (ses->capabilities & CAP_UNICODE) {
535 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
536 capabilities |= CAP_UNICODE;
537 }
538 if (ses->capabilities & CAP_STATUS32) {
539 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
540 capabilities |= CAP_STATUS32;
541 }
542 if (ses->capabilities & CAP_DFS) {
543 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
544 capabilities |= CAP_DFS;
545 }
546 if (ses->capabilities & CAP_UNIX)
547 capabilities |= CAP_UNIX;
548
549 return capabilities;
550}
551
552static void
553unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
554{
555 char *bcc_ptr = *pbcc_area;
556 int bytes_ret = 0;
557
558 /* Copy OS version */
559 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
560 nls_cp);
561 bcc_ptr += 2 * bytes_ret;
562 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
563 32, nls_cp);
564 bcc_ptr += 2 * bytes_ret;
565 bcc_ptr += 2; /* trailing null */
566
567 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
568 32, nls_cp);
569 bcc_ptr += 2 * bytes_ret;
570 bcc_ptr += 2; /* trailing null */
571
572 *pbcc_area = bcc_ptr;
573}
574
575static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
576 const struct nls_table *nls_cp)
577{
578 char *bcc_ptr = *pbcc_area;
579 int bytes_ret = 0;
580
581 /* copy domain */
582 if (ses->domainName == NULL) {
583 /* Sending null domain better than using a bogus domain name (as
584 we did briefly in 2.6.18) since server will use its default */
585 *bcc_ptr = 0;
586 *(bcc_ptr+1) = 0;
587 bytes_ret = 0;
588 } else
589 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
590 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
591 bcc_ptr += 2 * bytes_ret;
592 bcc_ptr += 2; /* account for null terminator */
593
594 *pbcc_area = bcc_ptr;
595}
596
597static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
598 const struct nls_table *nls_cp)
599{
600 char *bcc_ptr = *pbcc_area;
601 int bytes_ret = 0;
602
603 /* BB FIXME add check that strings total less
604 than 335 or will need to send them as arrays */
605
606 /* copy user */
607 if (ses->user_name == NULL) {
608 /* null user mount */
609 *bcc_ptr = 0;
610 *(bcc_ptr+1) = 0;
611 } else {
612 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
613 CIFS_MAX_USERNAME_LEN, nls_cp);
614 }
615 bcc_ptr += 2 * bytes_ret;
616 bcc_ptr += 2; /* account for null termination */
617
618 unicode_domain_string(&bcc_ptr, ses, nls_cp);
619 unicode_oslm_strings(&bcc_ptr, nls_cp);
620
621 *pbcc_area = bcc_ptr;
622}
623
624static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
625 const struct nls_table *nls_cp)
626{
627 char *bcc_ptr = *pbcc_area;
628 int len;
629
630 /* copy user */
631 /* BB what about null user mounts - check that we do this BB */
632 /* copy user */
633 if (ses->user_name != NULL) {
634 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
635 if (WARN_ON_ONCE(len < 0))
636 len = CIFS_MAX_USERNAME_LEN - 1;
637 bcc_ptr += len;
638 }
639 /* else null user mount */
640 *bcc_ptr = 0;
641 bcc_ptr++; /* account for null termination */
642
643 /* copy domain */
644 if (ses->domainName != NULL) {
645 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
646 if (WARN_ON_ONCE(len < 0))
647 len = CIFS_MAX_DOMAINNAME_LEN - 1;
648 bcc_ptr += len;
649 } /* else we will send a null domain name
650 so the server will default to its own domain */
651 *bcc_ptr = 0;
652 bcc_ptr++;
653
654 /* BB check for overflow here */
655
656 strcpy(bcc_ptr, "Linux version ");
657 bcc_ptr += strlen("Linux version ");
658 strcpy(bcc_ptr, init_utsname()->release);
659 bcc_ptr += strlen(init_utsname()->release) + 1;
660
661 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
662 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
663
664 *pbcc_area = bcc_ptr;
665}
666
667static void
668decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
669 const struct nls_table *nls_cp)
670{
671 int len;
672 char *data = *pbcc_area;
673
674 cifs_dbg(FYI, "bleft %d\n", bleft);
675
676 kfree(ses->serverOS);
677 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
678 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
679 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
680 data += len;
681 bleft -= len;
682 if (bleft <= 0)
683 return;
684
685 kfree(ses->serverNOS);
686 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
687 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
688 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
689 data += len;
690 bleft -= len;
691 if (bleft <= 0)
692 return;
693
694 kfree(ses->serverDomain);
695 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
696 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
697
698 return;
699}
700
701static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
702 struct cifs_ses *ses,
703 const struct nls_table *nls_cp)
704{
705 int len;
706 char *bcc_ptr = *pbcc_area;
707
708 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
709
710 len = strnlen(bcc_ptr, bleft);
711 if (len >= bleft)
712 return;
713
714 kfree(ses->serverOS);
715
716 ses->serverOS = kmalloc(len + 1, GFP_KERNEL);
717 if (ses->serverOS) {
718 memcpy(ses->serverOS, bcc_ptr, len);
719 ses->serverOS[len] = 0;
720 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
721 cifs_dbg(FYI, "OS/2 server\n");
722 }
723
724 bcc_ptr += len + 1;
725 bleft -= len + 1;
726
727 len = strnlen(bcc_ptr, bleft);
728 if (len >= bleft)
729 return;
730
731 kfree(ses->serverNOS);
732
733 ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);
734 if (ses->serverNOS) {
735 memcpy(ses->serverNOS, bcc_ptr, len);
736 ses->serverNOS[len] = 0;
737 }
738
739 bcc_ptr += len + 1;
740 bleft -= len + 1;
741
742 len = strnlen(bcc_ptr, bleft);
743 if (len > bleft)
744 return;
745
746 /* No domain field in LANMAN case. Domain is
747 returned by old servers in the SMB negprot response */
748 /* BB For newer servers which do not support Unicode,
749 but thus do return domain here we could add parsing
750 for it later, but it is not very important */
751 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
752}
753#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
754
755int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
756 struct cifs_ses *ses)
757{
758 unsigned int tioffset; /* challenge message target info area */
759 unsigned int tilen; /* challenge message target info area length */
760 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
761 __u32 server_flags;
762
763 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
764 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
765 return -EINVAL;
766 }
767
768 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
769 cifs_dbg(VFS, "blob signature incorrect %s\n",
770 pblob->Signature);
771 return -EINVAL;
772 }
773 if (pblob->MessageType != NtLmChallenge) {
774 cifs_dbg(VFS, "Incorrect message type %d\n",
775 pblob->MessageType);
776 return -EINVAL;
777 }
778
779 server_flags = le32_to_cpu(pblob->NegotiateFlags);
780 cifs_dbg(FYI, "%s: negotiate=0x%08x challenge=0x%08x\n", __func__,
781 ses->ntlmssp->client_flags, server_flags);
782
783 if ((ses->ntlmssp->client_flags & (NTLMSSP_NEGOTIATE_SEAL | NTLMSSP_NEGOTIATE_SIGN)) &&
784 (!(server_flags & NTLMSSP_NEGOTIATE_56) && !(server_flags & NTLMSSP_NEGOTIATE_128))) {
785 cifs_dbg(VFS, "%s: requested signing/encryption but server did not return either 56-bit or 128-bit session key size\n",
786 __func__);
787 return -EINVAL;
788 }
789 if (!(server_flags & NTLMSSP_NEGOTIATE_NTLM) && !(server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) {
790 cifs_dbg(VFS, "%s: server does not seem to support either NTLMv1 or NTLMv2\n", __func__);
791 return -EINVAL;
792 }
793 if (ses->server->sign && !(server_flags & NTLMSSP_NEGOTIATE_SIGN)) {
794 cifs_dbg(VFS, "%s: forced packet signing but server does not seem to support it\n",
795 __func__);
796 return -EOPNOTSUPP;
797 }
798 if ((ses->ntlmssp->client_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
799 !(server_flags & NTLMSSP_NEGOTIATE_KEY_XCH))
800 pr_warn_once("%s: authentication has been weakened as server does not support key exchange\n",
801 __func__);
802
803 ses->ntlmssp->server_flags = server_flags;
804
805 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
806 /* In particular we can examine sign flags */
807 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
808 we must set the MIC field of the AUTHENTICATE_MESSAGE */
809
810 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
811 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
812 if (tioffset > blob_len || tioffset + tilen > blob_len) {
813 cifs_dbg(VFS, "tioffset + tilen too high %u + %u\n",
814 tioffset, tilen);
815 return -EINVAL;
816 }
817 if (tilen) {
818 kfree_sensitive(ses->auth_key.response);
819 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
820 GFP_KERNEL);
821 if (!ses->auth_key.response) {
822 cifs_dbg(VFS, "Challenge target info alloc failure\n");
823 return -ENOMEM;
824 }
825 ses->auth_key.len = tilen;
826 }
827
828 return 0;
829}
830
831static int size_of_ntlmssp_blob(struct cifs_ses *ses, int base_size)
832{
833 int sz = base_size + ses->auth_key.len
834 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
835
836 if (ses->domainName)
837 sz += sizeof(__le16) * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
838 else
839 sz += sizeof(__le16);
840
841 if (ses->user_name)
842 sz += sizeof(__le16) * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
843 else
844 sz += sizeof(__le16);
845
846 if (ses->workstation_name[0])
847 sz += sizeof(__le16) * strnlen(ses->workstation_name,
848 ntlmssp_workstation_name_size(ses));
849 else
850 sz += sizeof(__le16);
851
852 return sz;
853}
854
855static inline void cifs_security_buffer_from_str(SECURITY_BUFFER *pbuf,
856 char *str_value,
857 int str_length,
858 unsigned char *pstart,
859 unsigned char **pcur,
860 const struct nls_table *nls_cp)
861{
862 unsigned char *tmp = pstart;
863 int len;
864
865 if (!pbuf)
866 return;
867
868 if (!pcur)
869 pcur = &tmp;
870
871 if (!str_value) {
872 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
873 pbuf->Length = 0;
874 pbuf->MaximumLength = 0;
875 *pcur += sizeof(__le16);
876 } else {
877 len = cifs_strtoUTF16((__le16 *)*pcur,
878 str_value,
879 str_length,
880 nls_cp);
881 len *= sizeof(__le16);
882 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
883 pbuf->Length = cpu_to_le16(len);
884 pbuf->MaximumLength = cpu_to_le16(len);
885 *pcur += len;
886 }
887}
888
889/* BB Move to ntlmssp.c eventually */
890
891int build_ntlmssp_negotiate_blob(unsigned char **pbuffer,
892 u16 *buflen,
893 struct cifs_ses *ses,
894 struct TCP_Server_Info *server,
895 const struct nls_table *nls_cp)
896{
897 int rc = 0;
898 NEGOTIATE_MESSAGE *sec_blob;
899 __u32 flags;
900 unsigned char *tmp;
901 int len;
902
903 len = size_of_ntlmssp_blob(ses, sizeof(NEGOTIATE_MESSAGE));
904 *pbuffer = kmalloc(len, GFP_KERNEL);
905 if (!*pbuffer) {
906 rc = -ENOMEM;
907 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
908 *buflen = 0;
909 goto setup_ntlm_neg_ret;
910 }
911 sec_blob = (NEGOTIATE_MESSAGE *)*pbuffer;
912
913 memset(*pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
914 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
915 sec_blob->MessageType = NtLmNegotiate;
916
917 /* BB is NTLMV2 session security format easier to use here? */
918 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
919 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
920 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
921 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
922 NTLMSSP_NEGOTIATE_SIGN;
923 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
924 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
925
926 tmp = *pbuffer + sizeof(NEGOTIATE_MESSAGE);
927 ses->ntlmssp->client_flags = flags;
928 sec_blob->NegotiateFlags = cpu_to_le32(flags);
929
930 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
931 cifs_security_buffer_from_str(&sec_blob->DomainName,
932 NULL,
933 CIFS_MAX_DOMAINNAME_LEN,
934 *pbuffer, &tmp,
935 nls_cp);
936
937 cifs_security_buffer_from_str(&sec_blob->WorkstationName,
938 NULL,
939 CIFS_MAX_WORKSTATION_LEN,
940 *pbuffer, &tmp,
941 nls_cp);
942
943 *buflen = tmp - *pbuffer;
944setup_ntlm_neg_ret:
945 return rc;
946}
947
948/*
949 * Build ntlmssp blob with additional fields, such as version,
950 * supported by modern servers. For safety limit to SMB3 or later
951 * See notes in MS-NLMP Section 2.2.2.1 e.g.
952 */
953int build_ntlmssp_smb3_negotiate_blob(unsigned char **pbuffer,
954 u16 *buflen,
955 struct cifs_ses *ses,
956 struct TCP_Server_Info *server,
957 const struct nls_table *nls_cp)
958{
959 int rc = 0;
960 struct negotiate_message *sec_blob;
961 __u32 flags;
962 unsigned char *tmp;
963 int len;
964
965 len = size_of_ntlmssp_blob(ses, sizeof(struct negotiate_message));
966 *pbuffer = kmalloc(len, GFP_KERNEL);
967 if (!*pbuffer) {
968 rc = -ENOMEM;
969 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
970 *buflen = 0;
971 goto setup_ntlm_smb3_neg_ret;
972 }
973 sec_blob = (struct negotiate_message *)*pbuffer;
974
975 memset(*pbuffer, 0, sizeof(struct negotiate_message));
976 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
977 sec_blob->MessageType = NtLmNegotiate;
978
979 /* BB is NTLMV2 session security format easier to use here? */
980 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
981 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
982 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
983 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
984 NTLMSSP_NEGOTIATE_SIGN | NTLMSSP_NEGOTIATE_VERSION;
985 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
986 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
987
988 sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR;
989 sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL;
990 sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD);
991 sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
992
993 tmp = *pbuffer + sizeof(struct negotiate_message);
994 ses->ntlmssp->client_flags = flags;
995 sec_blob->NegotiateFlags = cpu_to_le32(flags);
996
997 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
998 cifs_security_buffer_from_str(&sec_blob->DomainName,
999 NULL,
1000 CIFS_MAX_DOMAINNAME_LEN,
1001 *pbuffer, &tmp,
1002 nls_cp);
1003
1004 cifs_security_buffer_from_str(&sec_blob->WorkstationName,
1005 NULL,
1006 CIFS_MAX_WORKSTATION_LEN,
1007 *pbuffer, &tmp,
1008 nls_cp);
1009
1010 *buflen = tmp - *pbuffer;
1011setup_ntlm_smb3_neg_ret:
1012 return rc;
1013}
1014
1015
1016int build_ntlmssp_auth_blob(unsigned char **pbuffer,
1017 u16 *buflen,
1018 struct cifs_ses *ses,
1019 struct TCP_Server_Info *server,
1020 const struct nls_table *nls_cp)
1021{
1022 int rc;
1023 AUTHENTICATE_MESSAGE *sec_blob;
1024 __u32 flags;
1025 unsigned char *tmp;
1026 int len;
1027
1028 rc = setup_ntlmv2_rsp(ses, nls_cp);
1029 if (rc) {
1030 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
1031 *buflen = 0;
1032 goto setup_ntlmv2_ret;
1033 }
1034
1035 len = size_of_ntlmssp_blob(ses, sizeof(AUTHENTICATE_MESSAGE));
1036 *pbuffer = kmalloc(len, GFP_KERNEL);
1037 if (!*pbuffer) {
1038 rc = -ENOMEM;
1039 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
1040 *buflen = 0;
1041 goto setup_ntlmv2_ret;
1042 }
1043 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
1044
1045 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
1046 sec_blob->MessageType = NtLmAuthenticate;
1047
1048 flags = ses->ntlmssp->server_flags | NTLMSSP_REQUEST_TARGET |
1049 NTLMSSP_NEGOTIATE_TARGET_INFO | NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED;
1050
1051 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
1052 sec_blob->NegotiateFlags = cpu_to_le32(flags);
1053
1054 sec_blob->LmChallengeResponse.BufferOffset =
1055 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
1056 sec_blob->LmChallengeResponse.Length = 0;
1057 sec_blob->LmChallengeResponse.MaximumLength = 0;
1058
1059 sec_blob->NtChallengeResponse.BufferOffset =
1060 cpu_to_le32(tmp - *pbuffer);
1061 if (ses->user_name != NULL) {
1062 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1063 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1064 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1065
1066 sec_blob->NtChallengeResponse.Length =
1067 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1068 sec_blob->NtChallengeResponse.MaximumLength =
1069 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1070 } else {
1071 /*
1072 * don't send an NT Response for anonymous access
1073 */
1074 sec_blob->NtChallengeResponse.Length = 0;
1075 sec_blob->NtChallengeResponse.MaximumLength = 0;
1076 }
1077
1078 cifs_security_buffer_from_str(&sec_blob->DomainName,
1079 ses->domainName,
1080 CIFS_MAX_DOMAINNAME_LEN,
1081 *pbuffer, &tmp,
1082 nls_cp);
1083
1084 cifs_security_buffer_from_str(&sec_blob->UserName,
1085 ses->user_name,
1086 CIFS_MAX_USERNAME_LEN,
1087 *pbuffer, &tmp,
1088 nls_cp);
1089
1090 cifs_security_buffer_from_str(&sec_blob->WorkstationName,
1091 ses->workstation_name,
1092 ntlmssp_workstation_name_size(ses),
1093 *pbuffer, &tmp,
1094 nls_cp);
1095
1096 if ((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
1097 (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess) &&
1098 !calc_seckey(ses)) {
1099 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
1100 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
1101 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
1102 sec_blob->SessionKey.MaximumLength =
1103 cpu_to_le16(CIFS_CPHTXT_SIZE);
1104 tmp += CIFS_CPHTXT_SIZE;
1105 } else {
1106 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
1107 sec_blob->SessionKey.Length = 0;
1108 sec_blob->SessionKey.MaximumLength = 0;
1109 }
1110
1111 *buflen = tmp - *pbuffer;
1112setup_ntlmv2_ret:
1113 return rc;
1114}
1115
1116enum securityEnum
1117cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1118{
1119 switch (server->negflavor) {
1120 case CIFS_NEGFLAVOR_EXTENDED:
1121 switch (requested) {
1122 case Kerberos:
1123 case RawNTLMSSP:
1124 return requested;
1125 case Unspecified:
1126 if (server->sec_ntlmssp &&
1127 (global_secflags & CIFSSEC_MAY_NTLMSSP))
1128 return RawNTLMSSP;
1129 if ((server->sec_kerberos || server->sec_mskerberos) &&
1130 (global_secflags & CIFSSEC_MAY_KRB5))
1131 return Kerberos;
1132 fallthrough;
1133 default:
1134 return Unspecified;
1135 }
1136 case CIFS_NEGFLAVOR_UNENCAP:
1137 switch (requested) {
1138 case NTLMv2:
1139 return requested;
1140 case Unspecified:
1141 if (global_secflags & CIFSSEC_MAY_NTLMV2)
1142 return NTLMv2;
1143 break;
1144 default:
1145 break;
1146 }
1147 fallthrough;
1148 default:
1149 return Unspecified;
1150 }
1151}
1152
1153struct sess_data {
1154 unsigned int xid;
1155 struct cifs_ses *ses;
1156 struct TCP_Server_Info *server;
1157 struct nls_table *nls_cp;
1158 void (*func)(struct sess_data *);
1159 int result;
1160
1161 /* we will send the SMB in three pieces:
1162 * a fixed length beginning part, an optional
1163 * SPNEGO blob (which can be zero length), and a
1164 * last part which will include the strings
1165 * and rest of bcc area. This allows us to avoid
1166 * a large buffer 17K allocation
1167 */
1168 int buf0_type;
1169 struct kvec iov[3];
1170};
1171
1172#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1173static int
1174sess_alloc_buffer(struct sess_data *sess_data, int wct)
1175{
1176 int rc;
1177 struct cifs_ses *ses = sess_data->ses;
1178 struct smb_hdr *smb_buf;
1179
1180 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
1181 (void **)&smb_buf);
1182
1183 if (rc)
1184 return rc;
1185
1186 sess_data->iov[0].iov_base = (char *)smb_buf;
1187 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
1188 /*
1189 * This variable will be used to clear the buffer
1190 * allocated above in case of any error in the calling function.
1191 */
1192 sess_data->buf0_type = CIFS_SMALL_BUFFER;
1193
1194 /* 2000 big enough to fit max user, domain, NOS name etc. */
1195 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
1196 if (!sess_data->iov[2].iov_base) {
1197 rc = -ENOMEM;
1198 goto out_free_smb_buf;
1199 }
1200
1201 return 0;
1202
1203out_free_smb_buf:
1204 cifs_small_buf_release(smb_buf);
1205 sess_data->iov[0].iov_base = NULL;
1206 sess_data->iov[0].iov_len = 0;
1207 sess_data->buf0_type = CIFS_NO_BUFFER;
1208 return rc;
1209}
1210
1211static void
1212sess_free_buffer(struct sess_data *sess_data)
1213{
1214 struct kvec *iov = sess_data->iov;
1215
1216 /*
1217 * Zero the session data before freeing, as it might contain sensitive info (keys, etc).
1218 * Note that iov[1] is already freed by caller.
1219 */
1220 if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
1221 memzero_explicit(iov[0].iov_base, iov[0].iov_len);
1222
1223 free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
1224 sess_data->buf0_type = CIFS_NO_BUFFER;
1225 kfree_sensitive(iov[2].iov_base);
1226}
1227
1228static int
1229sess_establish_session(struct sess_data *sess_data)
1230{
1231 struct cifs_ses *ses = sess_data->ses;
1232 struct TCP_Server_Info *server = sess_data->server;
1233
1234 cifs_server_lock(server);
1235 if (!server->session_estab) {
1236 if (server->sign) {
1237 server->session_key.response =
1238 kmemdup(ses->auth_key.response,
1239 ses->auth_key.len, GFP_KERNEL);
1240 if (!server->session_key.response) {
1241 cifs_server_unlock(server);
1242 return -ENOMEM;
1243 }
1244 server->session_key.len =
1245 ses->auth_key.len;
1246 }
1247 server->sequence_number = 0x2;
1248 server->session_estab = true;
1249 }
1250 cifs_server_unlock(server);
1251
1252 cifs_dbg(FYI, "CIFS session established successfully\n");
1253 return 0;
1254}
1255
1256static int
1257sess_sendreceive(struct sess_data *sess_data)
1258{
1259 int rc;
1260 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
1261 __u16 count;
1262 struct kvec rsp_iov = { NULL, 0 };
1263
1264 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
1265 be32_add_cpu(&smb_buf->smb_buf_length, count);
1266 put_bcc(count, smb_buf);
1267
1268 rc = SendReceive2(sess_data->xid, sess_data->ses,
1269 sess_data->iov, 3 /* num_iovecs */,
1270 &sess_data->buf0_type,
1271 CIFS_LOG_ERROR, &rsp_iov);
1272 cifs_small_buf_release(sess_data->iov[0].iov_base);
1273 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1274
1275 return rc;
1276}
1277
1278static void
1279sess_auth_ntlmv2(struct sess_data *sess_data)
1280{
1281 int rc = 0;
1282 struct smb_hdr *smb_buf;
1283 SESSION_SETUP_ANDX *pSMB;
1284 char *bcc_ptr;
1285 struct cifs_ses *ses = sess_data->ses;
1286 struct TCP_Server_Info *server = sess_data->server;
1287 __u32 capabilities;
1288 __u16 bytes_remaining;
1289
1290 /* old style NTLM sessionsetup */
1291 /* wct = 13 */
1292 rc = sess_alloc_buffer(sess_data, 13);
1293 if (rc)
1294 goto out;
1295
1296 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1297 bcc_ptr = sess_data->iov[2].iov_base;
1298 capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1299
1300 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
1301
1302 /* LM2 password would be here if we supported it */
1303 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
1304
1305 if (ses->user_name != NULL) {
1306 /* calculate nlmv2 response and session key */
1307 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
1308 if (rc) {
1309 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
1310 goto out;
1311 }
1312
1313 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1314 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1315 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1316
1317 /* set case sensitive password length after tilen may get
1318 * assigned, tilen is 0 otherwise.
1319 */
1320 pSMB->req_no_secext.CaseSensitivePasswordLength =
1321 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1322 } else {
1323 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
1324 }
1325
1326 if (ses->capabilities & CAP_UNICODE) {
1327 if (!IS_ALIGNED(sess_data->iov[0].iov_len, 2)) {
1328 *bcc_ptr = 0;
1329 bcc_ptr++;
1330 }
1331 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1332 } else {
1333 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1334 }
1335
1336
1337 sess_data->iov[2].iov_len = (long) bcc_ptr -
1338 (long) sess_data->iov[2].iov_base;
1339
1340 rc = sess_sendreceive(sess_data);
1341 if (rc)
1342 goto out;
1343
1344 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1345 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1346
1347 if (smb_buf->WordCount != 3) {
1348 rc = -EIO;
1349 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1350 goto out;
1351 }
1352
1353 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1354 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1355
1356 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1357 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1358
1359 bytes_remaining = get_bcc(smb_buf);
1360 bcc_ptr = pByteArea(smb_buf);
1361
1362 /* BB check if Unicode and decode strings */
1363 if (bytes_remaining == 0) {
1364 /* no string area to decode, do nothing */
1365 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1366 /* unicode string area must be word-aligned */
1367 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1368 ++bcc_ptr;
1369 --bytes_remaining;
1370 }
1371 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1372 sess_data->nls_cp);
1373 } else {
1374 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1375 sess_data->nls_cp);
1376 }
1377
1378 rc = sess_establish_session(sess_data);
1379out:
1380 sess_data->result = rc;
1381 sess_data->func = NULL;
1382 sess_free_buffer(sess_data);
1383 kfree_sensitive(ses->auth_key.response);
1384 ses->auth_key.response = NULL;
1385}
1386
1387#ifdef CONFIG_CIFS_UPCALL
1388static void
1389sess_auth_kerberos(struct sess_data *sess_data)
1390{
1391 int rc = 0;
1392 struct smb_hdr *smb_buf;
1393 SESSION_SETUP_ANDX *pSMB;
1394 char *bcc_ptr;
1395 struct cifs_ses *ses = sess_data->ses;
1396 struct TCP_Server_Info *server = sess_data->server;
1397 __u32 capabilities;
1398 __u16 bytes_remaining;
1399 struct key *spnego_key = NULL;
1400 struct cifs_spnego_msg *msg;
1401 u16 blob_len;
1402
1403 /* extended security */
1404 /* wct = 12 */
1405 rc = sess_alloc_buffer(sess_data, 12);
1406 if (rc)
1407 goto out;
1408
1409 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1410 bcc_ptr = sess_data->iov[2].iov_base;
1411 capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1412
1413 spnego_key = cifs_get_spnego_key(ses, server);
1414 if (IS_ERR(spnego_key)) {
1415 rc = PTR_ERR(spnego_key);
1416 spnego_key = NULL;
1417 goto out;
1418 }
1419
1420 msg = spnego_key->payload.data[0];
1421 /*
1422 * check version field to make sure that cifs.upcall is
1423 * sending us a response in an expected form
1424 */
1425 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1426 cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n",
1427 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1428 rc = -EKEYREJECTED;
1429 goto out_put_spnego_key;
1430 }
1431
1432 kfree_sensitive(ses->auth_key.response);
1433 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1434 GFP_KERNEL);
1435 if (!ses->auth_key.response) {
1436 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1437 msg->sesskey_len);
1438 rc = -ENOMEM;
1439 goto out_put_spnego_key;
1440 }
1441 ses->auth_key.len = msg->sesskey_len;
1442
1443 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1444 capabilities |= CAP_EXTENDED_SECURITY;
1445 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1446 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1447 sess_data->iov[1].iov_len = msg->secblob_len;
1448 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1449
1450 if (ses->capabilities & CAP_UNICODE) {
1451 /* unicode strings must be word aligned */
1452 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
1453 *bcc_ptr = 0;
1454 bcc_ptr++;
1455 }
1456 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1457 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1458 } else {
1459 /* BB: is this right? */
1460 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1461 }
1462
1463 sess_data->iov[2].iov_len = (long) bcc_ptr -
1464 (long) sess_data->iov[2].iov_base;
1465
1466 rc = sess_sendreceive(sess_data);
1467 if (rc)
1468 goto out_put_spnego_key;
1469
1470 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1471 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1472
1473 if (smb_buf->WordCount != 4) {
1474 rc = -EIO;
1475 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1476 goto out_put_spnego_key;
1477 }
1478
1479 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1480 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1481
1482 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1483 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1484
1485 bytes_remaining = get_bcc(smb_buf);
1486 bcc_ptr = pByteArea(smb_buf);
1487
1488 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1489 if (blob_len > bytes_remaining) {
1490 cifs_dbg(VFS, "bad security blob length %d\n",
1491 blob_len);
1492 rc = -EINVAL;
1493 goto out_put_spnego_key;
1494 }
1495 bcc_ptr += blob_len;
1496 bytes_remaining -= blob_len;
1497
1498 /* BB check if Unicode and decode strings */
1499 if (bytes_remaining == 0) {
1500 /* no string area to decode, do nothing */
1501 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1502 /* unicode string area must be word-aligned */
1503 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1504 ++bcc_ptr;
1505 --bytes_remaining;
1506 }
1507 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1508 sess_data->nls_cp);
1509 } else {
1510 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1511 sess_data->nls_cp);
1512 }
1513
1514 rc = sess_establish_session(sess_data);
1515out_put_spnego_key:
1516 key_invalidate(spnego_key);
1517 key_put(spnego_key);
1518out:
1519 sess_data->result = rc;
1520 sess_data->func = NULL;
1521 sess_free_buffer(sess_data);
1522 kfree_sensitive(ses->auth_key.response);
1523 ses->auth_key.response = NULL;
1524}
1525
1526#endif /* ! CONFIG_CIFS_UPCALL */
1527
1528/*
1529 * The required kvec buffers have to be allocated before calling this
1530 * function.
1531 */
1532static int
1533_sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1534{
1535 SESSION_SETUP_ANDX *pSMB;
1536 struct cifs_ses *ses = sess_data->ses;
1537 struct TCP_Server_Info *server = sess_data->server;
1538 __u32 capabilities;
1539 char *bcc_ptr;
1540
1541 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1542
1543 capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1544 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1545 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1546 return -ENOSYS;
1547 }
1548
1549 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1550 capabilities |= CAP_EXTENDED_SECURITY;
1551 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1552
1553 bcc_ptr = sess_data->iov[2].iov_base;
1554 /* unicode strings must be word aligned */
1555 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
1556 *bcc_ptr = 0;
1557 bcc_ptr++;
1558 }
1559 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1560
1561 sess_data->iov[2].iov_len = (long) bcc_ptr -
1562 (long) sess_data->iov[2].iov_base;
1563
1564 return 0;
1565}
1566
1567static void
1568sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1569
1570static void
1571sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1572{
1573 int rc;
1574 struct smb_hdr *smb_buf;
1575 SESSION_SETUP_ANDX *pSMB;
1576 struct cifs_ses *ses = sess_data->ses;
1577 struct TCP_Server_Info *server = sess_data->server;
1578 __u16 bytes_remaining;
1579 char *bcc_ptr;
1580 unsigned char *ntlmsspblob = NULL;
1581 u16 blob_len;
1582
1583 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1584
1585 /*
1586 * if memory allocation is successful, caller of this function
1587 * frees it.
1588 */
1589 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1590 if (!ses->ntlmssp) {
1591 rc = -ENOMEM;
1592 goto out;
1593 }
1594 ses->ntlmssp->sesskey_per_smbsess = false;
1595
1596 /* wct = 12 */
1597 rc = sess_alloc_buffer(sess_data, 12);
1598 if (rc)
1599 goto out;
1600
1601 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1602
1603 /* Build security blob before we assemble the request */
1604 rc = build_ntlmssp_negotiate_blob(&ntlmsspblob,
1605 &blob_len, ses, server,
1606 sess_data->nls_cp);
1607 if (rc)
1608 goto out_free_ntlmsspblob;
1609
1610 sess_data->iov[1].iov_len = blob_len;
1611 sess_data->iov[1].iov_base = ntlmsspblob;
1612 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1613
1614 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1615 if (rc)
1616 goto out_free_ntlmsspblob;
1617
1618 rc = sess_sendreceive(sess_data);
1619
1620 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1621 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1622
1623 /* If true, rc here is expected and not an error */
1624 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1625 smb_buf->Status.CifsError ==
1626 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1627 rc = 0;
1628
1629 if (rc)
1630 goto out_free_ntlmsspblob;
1631
1632 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1633
1634 if (smb_buf->WordCount != 4) {
1635 rc = -EIO;
1636 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1637 goto out_free_ntlmsspblob;
1638 }
1639
1640 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1641 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1642
1643 bytes_remaining = get_bcc(smb_buf);
1644 bcc_ptr = pByteArea(smb_buf);
1645
1646 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1647 if (blob_len > bytes_remaining) {
1648 cifs_dbg(VFS, "bad security blob length %d\n",
1649 blob_len);
1650 rc = -EINVAL;
1651 goto out_free_ntlmsspblob;
1652 }
1653
1654 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1655
1656out_free_ntlmsspblob:
1657 kfree_sensitive(ntlmsspblob);
1658out:
1659 sess_free_buffer(sess_data);
1660
1661 if (!rc) {
1662 sess_data->func = sess_auth_rawntlmssp_authenticate;
1663 return;
1664 }
1665
1666 /* Else error. Cleanup */
1667 kfree_sensitive(ses->auth_key.response);
1668 ses->auth_key.response = NULL;
1669 kfree_sensitive(ses->ntlmssp);
1670 ses->ntlmssp = NULL;
1671
1672 sess_data->func = NULL;
1673 sess_data->result = rc;
1674}
1675
1676static void
1677sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1678{
1679 int rc;
1680 struct smb_hdr *smb_buf;
1681 SESSION_SETUP_ANDX *pSMB;
1682 struct cifs_ses *ses = sess_data->ses;
1683 struct TCP_Server_Info *server = sess_data->server;
1684 __u16 bytes_remaining;
1685 char *bcc_ptr;
1686 unsigned char *ntlmsspblob = NULL;
1687 u16 blob_len;
1688
1689 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1690
1691 /* wct = 12 */
1692 rc = sess_alloc_buffer(sess_data, 12);
1693 if (rc)
1694 goto out;
1695
1696 /* Build security blob before we assemble the request */
1697 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1698 smb_buf = (struct smb_hdr *)pSMB;
1699 rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1700 &blob_len, ses, server,
1701 sess_data->nls_cp);
1702 if (rc)
1703 goto out_free_ntlmsspblob;
1704 sess_data->iov[1].iov_len = blob_len;
1705 sess_data->iov[1].iov_base = ntlmsspblob;
1706 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1707 /*
1708 * Make sure that we tell the server that we are using
1709 * the uid that it just gave us back on the response
1710 * (challenge)
1711 */
1712 smb_buf->Uid = ses->Suid;
1713
1714 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1715 if (rc)
1716 goto out_free_ntlmsspblob;
1717
1718 rc = sess_sendreceive(sess_data);
1719 if (rc)
1720 goto out_free_ntlmsspblob;
1721
1722 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1723 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1724 if (smb_buf->WordCount != 4) {
1725 rc = -EIO;
1726 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1727 goto out_free_ntlmsspblob;
1728 }
1729
1730 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1731 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1732
1733 if (ses->Suid != smb_buf->Uid) {
1734 ses->Suid = smb_buf->Uid;
1735 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1736 }
1737
1738 bytes_remaining = get_bcc(smb_buf);
1739 bcc_ptr = pByteArea(smb_buf);
1740 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1741 if (blob_len > bytes_remaining) {
1742 cifs_dbg(VFS, "bad security blob length %d\n",
1743 blob_len);
1744 rc = -EINVAL;
1745 goto out_free_ntlmsspblob;
1746 }
1747 bcc_ptr += blob_len;
1748 bytes_remaining -= blob_len;
1749
1750
1751 /* BB check if Unicode and decode strings */
1752 if (bytes_remaining == 0) {
1753 /* no string area to decode, do nothing */
1754 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1755 /* unicode string area must be word-aligned */
1756 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1757 ++bcc_ptr;
1758 --bytes_remaining;
1759 }
1760 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1761 sess_data->nls_cp);
1762 } else {
1763 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1764 sess_data->nls_cp);
1765 }
1766
1767out_free_ntlmsspblob:
1768 kfree_sensitive(ntlmsspblob);
1769out:
1770 sess_free_buffer(sess_data);
1771
1772 if (!rc)
1773 rc = sess_establish_session(sess_data);
1774
1775 /* Cleanup */
1776 kfree_sensitive(ses->auth_key.response);
1777 ses->auth_key.response = NULL;
1778 kfree_sensitive(ses->ntlmssp);
1779 ses->ntlmssp = NULL;
1780
1781 sess_data->func = NULL;
1782 sess_data->result = rc;
1783}
1784
1785static int select_sec(struct sess_data *sess_data)
1786{
1787 int type;
1788 struct cifs_ses *ses = sess_data->ses;
1789 struct TCP_Server_Info *server = sess_data->server;
1790
1791 type = cifs_select_sectype(server, ses->sectype);
1792 cifs_dbg(FYI, "sess setup type %d\n", type);
1793 if (type == Unspecified) {
1794 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1795 return -EINVAL;
1796 }
1797
1798 switch (type) {
1799 case NTLMv2:
1800 sess_data->func = sess_auth_ntlmv2;
1801 break;
1802 case Kerberos:
1803#ifdef CONFIG_CIFS_UPCALL
1804 sess_data->func = sess_auth_kerberos;
1805 break;
1806#else
1807 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1808 return -ENOSYS;
1809#endif /* CONFIG_CIFS_UPCALL */
1810 case RawNTLMSSP:
1811 sess_data->func = sess_auth_rawntlmssp_negotiate;
1812 break;
1813 default:
1814 cifs_dbg(VFS, "secType %d not supported!\n", type);
1815 return -ENOSYS;
1816 }
1817
1818 return 0;
1819}
1820
1821int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1822 struct TCP_Server_Info *server,
1823 const struct nls_table *nls_cp)
1824{
1825 int rc = 0;
1826 struct sess_data *sess_data;
1827
1828 if (ses == NULL) {
1829 WARN(1, "%s: ses == NULL!", __func__);
1830 return -EINVAL;
1831 }
1832
1833 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1834 if (!sess_data)
1835 return -ENOMEM;
1836
1837 sess_data->xid = xid;
1838 sess_data->ses = ses;
1839 sess_data->server = server;
1840 sess_data->buf0_type = CIFS_NO_BUFFER;
1841 sess_data->nls_cp = (struct nls_table *) nls_cp;
1842
1843 rc = select_sec(sess_data);
1844 if (rc)
1845 goto out;
1846
1847 while (sess_data->func)
1848 sess_data->func(sess_data);
1849
1850 /* Store result before we free sess_data */
1851 rc = sess_data->result;
1852
1853out:
1854 kfree_sensitive(sess_data);
1855 return rc;
1856}
1857#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */