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_sb_info *cifs_sb, 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 unsigned 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 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
91 void
cifs_chan_set_in_reconnect(struct cifs_ses * ses,struct TCP_Server_Info * server)92 cifs_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
100 void
cifs_chan_clear_in_reconnect(struct cifs_ses * ses,struct TCP_Server_Info * server)101 cifs_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
109 bool
cifs_chan_in_reconnect(struct cifs_ses * ses,struct TCP_Server_Info * server)110 cifs_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
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 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
129 void
cifs_chan_clear_need_reconnect(struct cifs_ses * ses,struct TCP_Server_Info * server)130 cifs_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
140 bool
cifs_chan_needs_reconnect(struct cifs_ses * ses,struct TCP_Server_Info * server)141 cifs_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
149 bool
cifs_chan_is_iface_active(struct cifs_ses * ses,struct TCP_Server_Info * server)150 cifs_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 */
cifs_try_adding_channels(struct cifs_sb_info * cifs_sb,struct cifs_ses * ses)160 int 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 */
262 int
cifs_chan_update_iface(struct cifs_ses * ses,struct TCP_Server_Info * server)263 cifs_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 */
340 struct cifs_chan *
cifs_ses_find_chan(struct cifs_ses * ses,struct TCP_Server_Info * server)341 cifs_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
356 static int
cifs_ses_add_channel(struct cifs_sb_info * cifs_sb,struct cifs_ses * ses,struct cifs_server_iface * iface)357 cifs_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
476 out:
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->reconnect);
484
485 spin_lock(&ses->chan_lock);
486 /* we rely on all bits beyond chan_count to be clear */
487 cifs_chan_clear_need_reconnect(ses, chan->server);
488 ses->chan_count--;
489 /*
490 * chan_count should never reach 0 as at least the primary
491 * channel is always allocated
492 */
493 WARN_ON(ses->chan_count < 1);
494 spin_unlock(&ses->chan_lock);
495
496 cifs_put_tcp_session(chan->server, 0);
497 }
498
499 free_xid(xid);
500 return rc;
501 }
502
503 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
cifs_ssetup_hdr(struct cifs_ses * ses,struct TCP_Server_Info * server,SESSION_SETUP_ANDX * pSMB)504 static __u32 cifs_ssetup_hdr(struct cifs_ses *ses,
505 struct TCP_Server_Info *server,
506 SESSION_SETUP_ANDX *pSMB)
507 {
508 __u32 capabilities = 0;
509
510 /* init fields common to all four types of SessSetup */
511 /* Note that offsets for first seven fields in req struct are same */
512 /* in CIFS Specs so does not matter which of 3 forms of struct */
513 /* that we use in next few lines */
514 /* Note that header is initialized to zero in header_assemble */
515 pSMB->req.AndXCommand = 0xFF;
516 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
517 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
518 USHRT_MAX));
519 pSMB->req.MaxMpxCount = cpu_to_le16(server->maxReq);
520 pSMB->req.VcNumber = cpu_to_le16(1);
521
522 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
523
524 /* BB verify whether signing required on neg or just on auth frame
525 (and NTLM case) */
526
527 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
528 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
529
530 if (server->sign)
531 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
532
533 if (ses->capabilities & CAP_UNICODE) {
534 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
535 capabilities |= CAP_UNICODE;
536 }
537 if (ses->capabilities & CAP_STATUS32) {
538 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
539 capabilities |= CAP_STATUS32;
540 }
541 if (ses->capabilities & CAP_DFS) {
542 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
543 capabilities |= CAP_DFS;
544 }
545 if (ses->capabilities & CAP_UNIX)
546 capabilities |= CAP_UNIX;
547
548 return capabilities;
549 }
550
551 static void
unicode_oslm_strings(char ** pbcc_area,const struct nls_table * nls_cp)552 unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
553 {
554 char *bcc_ptr = *pbcc_area;
555 int bytes_ret = 0;
556
557 /* Copy OS version */
558 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
559 nls_cp);
560 bcc_ptr += 2 * bytes_ret;
561 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
562 32, nls_cp);
563 bcc_ptr += 2 * bytes_ret;
564 bcc_ptr += 2; /* trailing null */
565
566 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
567 32, nls_cp);
568 bcc_ptr += 2 * bytes_ret;
569 bcc_ptr += 2; /* trailing null */
570
571 *pbcc_area = bcc_ptr;
572 }
573
unicode_domain_string(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)574 static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
575 const struct nls_table *nls_cp)
576 {
577 char *bcc_ptr = *pbcc_area;
578 int bytes_ret = 0;
579
580 /* copy domain */
581 if (ses->domainName == NULL) {
582 /* Sending null domain better than using a bogus domain name (as
583 we did briefly in 2.6.18) since server will use its default */
584 *bcc_ptr = 0;
585 *(bcc_ptr+1) = 0;
586 bytes_ret = 0;
587 } else
588 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
589 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
590 bcc_ptr += 2 * bytes_ret;
591 bcc_ptr += 2; /* account for null terminator */
592
593 *pbcc_area = bcc_ptr;
594 }
595
unicode_ssetup_strings(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)596 static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
597 const struct nls_table *nls_cp)
598 {
599 char *bcc_ptr = *pbcc_area;
600 int bytes_ret = 0;
601
602 /* BB FIXME add check that strings total less
603 than 335 or will need to send them as arrays */
604
605 /* copy user */
606 if (ses->user_name == NULL) {
607 /* null user mount */
608 *bcc_ptr = 0;
609 *(bcc_ptr+1) = 0;
610 } else {
611 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
612 CIFS_MAX_USERNAME_LEN, nls_cp);
613 }
614 bcc_ptr += 2 * bytes_ret;
615 bcc_ptr += 2; /* account for null termination */
616
617 unicode_domain_string(&bcc_ptr, ses, nls_cp);
618 unicode_oslm_strings(&bcc_ptr, nls_cp);
619
620 *pbcc_area = bcc_ptr;
621 }
622
ascii_ssetup_strings(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)623 static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
624 const struct nls_table *nls_cp)
625 {
626 char *bcc_ptr = *pbcc_area;
627 int len;
628
629 /* copy user */
630 /* BB what about null user mounts - check that we do this BB */
631 /* copy user */
632 if (ses->user_name != NULL) {
633 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
634 if (WARN_ON_ONCE(len < 0))
635 len = CIFS_MAX_USERNAME_LEN - 1;
636 bcc_ptr += len;
637 }
638 /* else null user mount */
639 *bcc_ptr = 0;
640 bcc_ptr++; /* account for null termination */
641
642 /* copy domain */
643 if (ses->domainName != NULL) {
644 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
645 if (WARN_ON_ONCE(len < 0))
646 len = CIFS_MAX_DOMAINNAME_LEN - 1;
647 bcc_ptr += len;
648 } /* else we will send a null domain name
649 so the server will default to its own domain */
650 *bcc_ptr = 0;
651 bcc_ptr++;
652
653 /* BB check for overflow here */
654
655 strcpy(bcc_ptr, "Linux version ");
656 bcc_ptr += strlen("Linux version ");
657 strcpy(bcc_ptr, init_utsname()->release);
658 bcc_ptr += strlen(init_utsname()->release) + 1;
659
660 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
661 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
662
663 *pbcc_area = bcc_ptr;
664 }
665
666 static void
decode_unicode_ssetup(char ** pbcc_area,int bleft,struct cifs_ses * ses,const struct nls_table * nls_cp)667 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
668 const struct nls_table *nls_cp)
669 {
670 int len;
671 char *data = *pbcc_area;
672
673 cifs_dbg(FYI, "bleft %d\n", bleft);
674
675 kfree(ses->serverOS);
676 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
677 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
678 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
679 data += len;
680 bleft -= len;
681 if (bleft <= 0)
682 return;
683
684 kfree(ses->serverNOS);
685 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
686 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
687 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
688 data += len;
689 bleft -= len;
690 if (bleft <= 0)
691 return;
692
693 kfree(ses->serverDomain);
694 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
695 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
696
697 return;
698 }
699
decode_ascii_ssetup(char ** pbcc_area,__u16 bleft,struct cifs_ses * ses,const struct nls_table * nls_cp)700 static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
701 struct cifs_ses *ses,
702 const struct nls_table *nls_cp)
703 {
704 int len;
705 char *bcc_ptr = *pbcc_area;
706
707 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
708
709 len = strnlen(bcc_ptr, bleft);
710 if (len >= bleft)
711 return;
712
713 kfree(ses->serverOS);
714
715 ses->serverOS = kmalloc(len + 1, GFP_KERNEL);
716 if (ses->serverOS) {
717 memcpy(ses->serverOS, bcc_ptr, len);
718 ses->serverOS[len] = 0;
719 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
720 cifs_dbg(FYI, "OS/2 server\n");
721 }
722
723 bcc_ptr += len + 1;
724 bleft -= len + 1;
725
726 len = strnlen(bcc_ptr, bleft);
727 if (len >= bleft)
728 return;
729
730 kfree(ses->serverNOS);
731
732 ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);
733 if (ses->serverNOS) {
734 memcpy(ses->serverNOS, bcc_ptr, len);
735 ses->serverNOS[len] = 0;
736 }
737
738 bcc_ptr += len + 1;
739 bleft -= len + 1;
740
741 len = strnlen(bcc_ptr, bleft);
742 if (len > bleft)
743 return;
744
745 /* No domain field in LANMAN case. Domain is
746 returned by old servers in the SMB negprot response */
747 /* BB For newer servers which do not support Unicode,
748 but thus do return domain here we could add parsing
749 for it later, but it is not very important */
750 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
751 }
752 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
753
decode_ntlmssp_challenge(char * bcc_ptr,int blob_len,struct cifs_ses * ses)754 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
755 struct cifs_ses *ses)
756 {
757 unsigned int tioffset; /* challenge message target info area */
758 unsigned int tilen; /* challenge message target info area length */
759 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
760 __u32 server_flags;
761
762 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
763 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
764 return -EINVAL;
765 }
766
767 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
768 cifs_dbg(VFS, "blob signature incorrect %s\n",
769 pblob->Signature);
770 return -EINVAL;
771 }
772 if (pblob->MessageType != NtLmChallenge) {
773 cifs_dbg(VFS, "Incorrect message type %d\n",
774 pblob->MessageType);
775 return -EINVAL;
776 }
777
778 server_flags = le32_to_cpu(pblob->NegotiateFlags);
779 cifs_dbg(FYI, "%s: negotiate=0x%08x challenge=0x%08x\n", __func__,
780 ses->ntlmssp->client_flags, server_flags);
781
782 if ((ses->ntlmssp->client_flags & (NTLMSSP_NEGOTIATE_SEAL | NTLMSSP_NEGOTIATE_SIGN)) &&
783 (!(server_flags & NTLMSSP_NEGOTIATE_56) && !(server_flags & NTLMSSP_NEGOTIATE_128))) {
784 cifs_dbg(VFS, "%s: requested signing/encryption but server did not return either 56-bit or 128-bit session key size\n",
785 __func__);
786 return -EINVAL;
787 }
788 if (!(server_flags & NTLMSSP_NEGOTIATE_NTLM) && !(server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) {
789 cifs_dbg(VFS, "%s: server does not seem to support either NTLMv1 or NTLMv2\n", __func__);
790 return -EINVAL;
791 }
792 if (ses->server->sign && !(server_flags & NTLMSSP_NEGOTIATE_SIGN)) {
793 cifs_dbg(VFS, "%s: forced packet signing but server does not seem to support it\n",
794 __func__);
795 return -EOPNOTSUPP;
796 }
797 if ((ses->ntlmssp->client_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
798 !(server_flags & NTLMSSP_NEGOTIATE_KEY_XCH))
799 pr_warn_once("%s: authentication has been weakened as server does not support key exchange\n",
800 __func__);
801
802 ses->ntlmssp->server_flags = server_flags;
803
804 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
805 /* In particular we can examine sign flags */
806 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
807 we must set the MIC field of the AUTHENTICATE_MESSAGE */
808
809 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
810 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
811 if (tioffset > blob_len || tioffset + tilen > blob_len) {
812 cifs_dbg(VFS, "tioffset + tilen too high %u + %u\n",
813 tioffset, tilen);
814 return -EINVAL;
815 }
816 if (tilen) {
817 kfree_sensitive(ses->auth_key.response);
818 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
819 GFP_KERNEL);
820 if (!ses->auth_key.response) {
821 cifs_dbg(VFS, "Challenge target info alloc failure\n");
822 return -ENOMEM;
823 }
824 ses->auth_key.len = tilen;
825 }
826
827 return 0;
828 }
829
size_of_ntlmssp_blob(struct cifs_ses * ses,int base_size)830 static int size_of_ntlmssp_blob(struct cifs_ses *ses, int base_size)
831 {
832 int sz = base_size + ses->auth_key.len
833 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
834
835 if (ses->domainName)
836 sz += sizeof(__le16) * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
837 else
838 sz += sizeof(__le16);
839
840 if (ses->user_name)
841 sz += sizeof(__le16) * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
842 else
843 sz += sizeof(__le16);
844
845 if (ses->workstation_name[0])
846 sz += sizeof(__le16) * strnlen(ses->workstation_name,
847 ntlmssp_workstation_name_size(ses));
848 else
849 sz += sizeof(__le16);
850
851 return sz;
852 }
853
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)854 static inline void cifs_security_buffer_from_str(SECURITY_BUFFER *pbuf,
855 char *str_value,
856 int str_length,
857 unsigned char *pstart,
858 unsigned char **pcur,
859 const struct nls_table *nls_cp)
860 {
861 unsigned char *tmp = pstart;
862 int len;
863
864 if (!pbuf)
865 return;
866
867 if (!pcur)
868 pcur = &tmp;
869
870 if (!str_value) {
871 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
872 pbuf->Length = 0;
873 pbuf->MaximumLength = 0;
874 *pcur += sizeof(__le16);
875 } else {
876 len = cifs_strtoUTF16((__le16 *)*pcur,
877 str_value,
878 str_length,
879 nls_cp);
880 len *= sizeof(__le16);
881 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
882 pbuf->Length = cpu_to_le16(len);
883 pbuf->MaximumLength = cpu_to_le16(len);
884 *pcur += len;
885 }
886 }
887
888 /* BB Move to ntlmssp.c eventually */
889
build_ntlmssp_negotiate_blob(unsigned char ** pbuffer,u16 * buflen,struct cifs_ses * ses,struct TCP_Server_Info * server,const struct nls_table * nls_cp)890 int build_ntlmssp_negotiate_blob(unsigned char **pbuffer,
891 u16 *buflen,
892 struct cifs_ses *ses,
893 struct TCP_Server_Info *server,
894 const struct nls_table *nls_cp)
895 {
896 int rc = 0;
897 NEGOTIATE_MESSAGE *sec_blob;
898 __u32 flags;
899 unsigned char *tmp;
900 int len;
901
902 len = size_of_ntlmssp_blob(ses, sizeof(NEGOTIATE_MESSAGE));
903 *pbuffer = kmalloc(len, GFP_KERNEL);
904 if (!*pbuffer) {
905 rc = -ENOMEM;
906 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
907 *buflen = 0;
908 goto setup_ntlm_neg_ret;
909 }
910 sec_blob = (NEGOTIATE_MESSAGE *)*pbuffer;
911
912 memset(*pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
913 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
914 sec_blob->MessageType = NtLmNegotiate;
915
916 /* BB is NTLMV2 session security format easier to use here? */
917 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
918 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
919 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
920 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
921 NTLMSSP_NEGOTIATE_SIGN;
922 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
923 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
924
925 tmp = *pbuffer + sizeof(NEGOTIATE_MESSAGE);
926 ses->ntlmssp->client_flags = flags;
927 sec_blob->NegotiateFlags = cpu_to_le32(flags);
928
929 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
930 cifs_security_buffer_from_str(&sec_blob->DomainName,
931 NULL,
932 CIFS_MAX_DOMAINNAME_LEN,
933 *pbuffer, &tmp,
934 nls_cp);
935
936 cifs_security_buffer_from_str(&sec_blob->WorkstationName,
937 NULL,
938 CIFS_MAX_WORKSTATION_LEN,
939 *pbuffer, &tmp,
940 nls_cp);
941
942 *buflen = tmp - *pbuffer;
943 setup_ntlm_neg_ret:
944 return rc;
945 }
946
947 /*
948 * Build ntlmssp blob with additional fields, such as version,
949 * supported by modern servers. For safety limit to SMB3 or later
950 * See notes in MS-NLMP Section 2.2.2.1 e.g.
951 */
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)952 int build_ntlmssp_smb3_negotiate_blob(unsigned char **pbuffer,
953 u16 *buflen,
954 struct cifs_ses *ses,
955 struct TCP_Server_Info *server,
956 const struct nls_table *nls_cp)
957 {
958 int rc = 0;
959 struct negotiate_message *sec_blob;
960 __u32 flags;
961 unsigned char *tmp;
962 int len;
963
964 len = size_of_ntlmssp_blob(ses, sizeof(struct negotiate_message));
965 *pbuffer = kmalloc(len, GFP_KERNEL);
966 if (!*pbuffer) {
967 rc = -ENOMEM;
968 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
969 *buflen = 0;
970 goto setup_ntlm_smb3_neg_ret;
971 }
972 sec_blob = (struct negotiate_message *)*pbuffer;
973
974 memset(*pbuffer, 0, sizeof(struct negotiate_message));
975 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
976 sec_blob->MessageType = NtLmNegotiate;
977
978 /* BB is NTLMV2 session security format easier to use here? */
979 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
980 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
981 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
982 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
983 NTLMSSP_NEGOTIATE_SIGN | NTLMSSP_NEGOTIATE_VERSION;
984 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
985 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
986
987 sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR;
988 sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL;
989 sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD);
990 sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
991
992 tmp = *pbuffer + sizeof(struct negotiate_message);
993 ses->ntlmssp->client_flags = flags;
994 sec_blob->NegotiateFlags = cpu_to_le32(flags);
995
996 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
997 cifs_security_buffer_from_str(&sec_blob->DomainName,
998 NULL,
999 CIFS_MAX_DOMAINNAME_LEN,
1000 *pbuffer, &tmp,
1001 nls_cp);
1002
1003 cifs_security_buffer_from_str(&sec_blob->WorkstationName,
1004 NULL,
1005 CIFS_MAX_WORKSTATION_LEN,
1006 *pbuffer, &tmp,
1007 nls_cp);
1008
1009 *buflen = tmp - *pbuffer;
1010 setup_ntlm_smb3_neg_ret:
1011 return rc;
1012 }
1013
1014
build_ntlmssp_auth_blob(unsigned char ** pbuffer,u16 * buflen,struct cifs_ses * ses,struct TCP_Server_Info * server,const struct nls_table * nls_cp)1015 int build_ntlmssp_auth_blob(unsigned char **pbuffer,
1016 u16 *buflen,
1017 struct cifs_ses *ses,
1018 struct TCP_Server_Info *server,
1019 const struct nls_table *nls_cp)
1020 {
1021 int rc;
1022 AUTHENTICATE_MESSAGE *sec_blob;
1023 __u32 flags;
1024 unsigned char *tmp;
1025 int len;
1026
1027 rc = setup_ntlmv2_rsp(ses, nls_cp);
1028 if (rc) {
1029 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
1030 *buflen = 0;
1031 goto setup_ntlmv2_ret;
1032 }
1033
1034 len = size_of_ntlmssp_blob(ses, sizeof(AUTHENTICATE_MESSAGE));
1035 *pbuffer = kmalloc(len, GFP_KERNEL);
1036 if (!*pbuffer) {
1037 rc = -ENOMEM;
1038 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
1039 *buflen = 0;
1040 goto setup_ntlmv2_ret;
1041 }
1042 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
1043
1044 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
1045 sec_blob->MessageType = NtLmAuthenticate;
1046
1047 flags = ses->ntlmssp->server_flags | NTLMSSP_REQUEST_TARGET |
1048 NTLMSSP_NEGOTIATE_TARGET_INFO | NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED;
1049
1050 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
1051 sec_blob->NegotiateFlags = cpu_to_le32(flags);
1052
1053 sec_blob->LmChallengeResponse.BufferOffset =
1054 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
1055 sec_blob->LmChallengeResponse.Length = 0;
1056 sec_blob->LmChallengeResponse.MaximumLength = 0;
1057
1058 sec_blob->NtChallengeResponse.BufferOffset =
1059 cpu_to_le32(tmp - *pbuffer);
1060 if (ses->user_name != NULL) {
1061 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1062 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1063 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1064
1065 sec_blob->NtChallengeResponse.Length =
1066 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1067 sec_blob->NtChallengeResponse.MaximumLength =
1068 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1069 } else {
1070 /*
1071 * don't send an NT Response for anonymous access
1072 */
1073 sec_blob->NtChallengeResponse.Length = 0;
1074 sec_blob->NtChallengeResponse.MaximumLength = 0;
1075 }
1076
1077 cifs_security_buffer_from_str(&sec_blob->DomainName,
1078 ses->domainName,
1079 CIFS_MAX_DOMAINNAME_LEN,
1080 *pbuffer, &tmp,
1081 nls_cp);
1082
1083 cifs_security_buffer_from_str(&sec_blob->UserName,
1084 ses->user_name,
1085 CIFS_MAX_USERNAME_LEN,
1086 *pbuffer, &tmp,
1087 nls_cp);
1088
1089 cifs_security_buffer_from_str(&sec_blob->WorkstationName,
1090 ses->workstation_name,
1091 ntlmssp_workstation_name_size(ses),
1092 *pbuffer, &tmp,
1093 nls_cp);
1094
1095 if ((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
1096 (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess) &&
1097 !calc_seckey(ses)) {
1098 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
1099 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
1100 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
1101 sec_blob->SessionKey.MaximumLength =
1102 cpu_to_le16(CIFS_CPHTXT_SIZE);
1103 tmp += CIFS_CPHTXT_SIZE;
1104 } else {
1105 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
1106 sec_blob->SessionKey.Length = 0;
1107 sec_blob->SessionKey.MaximumLength = 0;
1108 }
1109
1110 *buflen = tmp - *pbuffer;
1111 setup_ntlmv2_ret:
1112 return rc;
1113 }
1114
1115 enum securityEnum
cifs_select_sectype(struct TCP_Server_Info * server,enum securityEnum requested)1116 cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1117 {
1118 switch (server->negflavor) {
1119 case CIFS_NEGFLAVOR_EXTENDED:
1120 switch (requested) {
1121 case Kerberos:
1122 case RawNTLMSSP:
1123 return requested;
1124 case Unspecified:
1125 if (server->sec_ntlmssp &&
1126 (global_secflags & CIFSSEC_MAY_NTLMSSP))
1127 return RawNTLMSSP;
1128 if ((server->sec_kerberos || server->sec_mskerberos) &&
1129 (global_secflags & CIFSSEC_MAY_KRB5))
1130 return Kerberos;
1131 fallthrough;
1132 default:
1133 return Unspecified;
1134 }
1135 case CIFS_NEGFLAVOR_UNENCAP:
1136 switch (requested) {
1137 case NTLMv2:
1138 return requested;
1139 case Unspecified:
1140 if (global_secflags & CIFSSEC_MAY_NTLMV2)
1141 return NTLMv2;
1142 break;
1143 default:
1144 break;
1145 }
1146 fallthrough;
1147 default:
1148 return Unspecified;
1149 }
1150 }
1151
1152 struct sess_data {
1153 unsigned int xid;
1154 struct cifs_ses *ses;
1155 struct TCP_Server_Info *server;
1156 struct nls_table *nls_cp;
1157 void (*func)(struct sess_data *);
1158 int result;
1159
1160 /* we will send the SMB in three pieces:
1161 * a fixed length beginning part, an optional
1162 * SPNEGO blob (which can be zero length), and a
1163 * last part which will include the strings
1164 * and rest of bcc area. This allows us to avoid
1165 * a large buffer 17K allocation
1166 */
1167 int buf0_type;
1168 struct kvec iov[3];
1169 };
1170
1171 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1172 static int
sess_alloc_buffer(struct sess_data * sess_data,int wct)1173 sess_alloc_buffer(struct sess_data *sess_data, int wct)
1174 {
1175 int rc;
1176 struct cifs_ses *ses = sess_data->ses;
1177 struct smb_hdr *smb_buf;
1178
1179 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
1180 (void **)&smb_buf);
1181
1182 if (rc)
1183 return rc;
1184
1185 sess_data->iov[0].iov_base = (char *)smb_buf;
1186 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
1187 /*
1188 * This variable will be used to clear the buffer
1189 * allocated above in case of any error in the calling function.
1190 */
1191 sess_data->buf0_type = CIFS_SMALL_BUFFER;
1192
1193 /* 2000 big enough to fit max user, domain, NOS name etc. */
1194 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
1195 if (!sess_data->iov[2].iov_base) {
1196 rc = -ENOMEM;
1197 goto out_free_smb_buf;
1198 }
1199
1200 return 0;
1201
1202 out_free_smb_buf:
1203 cifs_small_buf_release(smb_buf);
1204 sess_data->iov[0].iov_base = NULL;
1205 sess_data->iov[0].iov_len = 0;
1206 sess_data->buf0_type = CIFS_NO_BUFFER;
1207 return rc;
1208 }
1209
1210 static void
sess_free_buffer(struct sess_data * sess_data)1211 sess_free_buffer(struct sess_data *sess_data)
1212 {
1213 struct kvec *iov = sess_data->iov;
1214
1215 /*
1216 * Zero the session data before freeing, as it might contain sensitive info (keys, etc).
1217 * Note that iov[1] is already freed by caller.
1218 */
1219 if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
1220 memzero_explicit(iov[0].iov_base, iov[0].iov_len);
1221
1222 free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
1223 sess_data->buf0_type = CIFS_NO_BUFFER;
1224 kfree_sensitive(iov[2].iov_base);
1225 }
1226
1227 static int
sess_establish_session(struct sess_data * sess_data)1228 sess_establish_session(struct sess_data *sess_data)
1229 {
1230 struct cifs_ses *ses = sess_data->ses;
1231 struct TCP_Server_Info *server = sess_data->server;
1232
1233 cifs_server_lock(server);
1234 if (!server->session_estab) {
1235 if (server->sign) {
1236 server->session_key.response =
1237 kmemdup(ses->auth_key.response,
1238 ses->auth_key.len, GFP_KERNEL);
1239 if (!server->session_key.response) {
1240 cifs_server_unlock(server);
1241 return -ENOMEM;
1242 }
1243 server->session_key.len =
1244 ses->auth_key.len;
1245 }
1246 server->sequence_number = 0x2;
1247 server->session_estab = true;
1248 }
1249 cifs_server_unlock(server);
1250
1251 cifs_dbg(FYI, "CIFS session established successfully\n");
1252 return 0;
1253 }
1254
1255 static int
sess_sendreceive(struct sess_data * sess_data)1256 sess_sendreceive(struct sess_data *sess_data)
1257 {
1258 int rc;
1259 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
1260 __u16 count;
1261 struct kvec rsp_iov = { NULL, 0 };
1262
1263 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
1264 be32_add_cpu(&smb_buf->smb_buf_length, count);
1265 put_bcc(count, smb_buf);
1266
1267 rc = SendReceive2(sess_data->xid, sess_data->ses,
1268 sess_data->iov, 3 /* num_iovecs */,
1269 &sess_data->buf0_type,
1270 CIFS_LOG_ERROR, &rsp_iov);
1271 cifs_small_buf_release(sess_data->iov[0].iov_base);
1272 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1273
1274 return rc;
1275 }
1276
1277 static void
sess_auth_ntlmv2(struct sess_data * sess_data)1278 sess_auth_ntlmv2(struct sess_data *sess_data)
1279 {
1280 int rc = 0;
1281 struct smb_hdr *smb_buf;
1282 SESSION_SETUP_ANDX *pSMB;
1283 char *bcc_ptr;
1284 struct cifs_ses *ses = sess_data->ses;
1285 struct TCP_Server_Info *server = sess_data->server;
1286 __u32 capabilities;
1287 __u16 bytes_remaining;
1288
1289 /* old style NTLM sessionsetup */
1290 /* wct = 13 */
1291 rc = sess_alloc_buffer(sess_data, 13);
1292 if (rc)
1293 goto out;
1294
1295 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1296 bcc_ptr = sess_data->iov[2].iov_base;
1297 capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1298
1299 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
1300
1301 /* LM2 password would be here if we supported it */
1302 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
1303
1304 if (ses->user_name != NULL) {
1305 /* calculate nlmv2 response and session key */
1306 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
1307 if (rc) {
1308 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
1309 goto out;
1310 }
1311
1312 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1313 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1314 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1315
1316 /* set case sensitive password length after tilen may get
1317 * assigned, tilen is 0 otherwise.
1318 */
1319 pSMB->req_no_secext.CaseSensitivePasswordLength =
1320 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1321 } else {
1322 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
1323 }
1324
1325 if (ses->capabilities & CAP_UNICODE) {
1326 if (!IS_ALIGNED(sess_data->iov[0].iov_len, 2)) {
1327 *bcc_ptr = 0;
1328 bcc_ptr++;
1329 }
1330 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1331 } else {
1332 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1333 }
1334
1335
1336 sess_data->iov[2].iov_len = (long) bcc_ptr -
1337 (long) sess_data->iov[2].iov_base;
1338
1339 rc = sess_sendreceive(sess_data);
1340 if (rc)
1341 goto out;
1342
1343 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1344 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1345
1346 if (smb_buf->WordCount != 3) {
1347 rc = -EIO;
1348 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1349 goto out;
1350 }
1351
1352 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1353 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1354
1355 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1356 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1357
1358 bytes_remaining = get_bcc(smb_buf);
1359 bcc_ptr = pByteArea(smb_buf);
1360
1361 /* BB check if Unicode and decode strings */
1362 if (bytes_remaining == 0) {
1363 /* no string area to decode, do nothing */
1364 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1365 /* unicode string area must be word-aligned */
1366 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1367 ++bcc_ptr;
1368 --bytes_remaining;
1369 }
1370 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1371 sess_data->nls_cp);
1372 } else {
1373 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1374 sess_data->nls_cp);
1375 }
1376
1377 rc = sess_establish_session(sess_data);
1378 out:
1379 sess_data->result = rc;
1380 sess_data->func = NULL;
1381 sess_free_buffer(sess_data);
1382 kfree_sensitive(ses->auth_key.response);
1383 ses->auth_key.response = NULL;
1384 }
1385
1386 #ifdef CONFIG_CIFS_UPCALL
1387 static void
sess_auth_kerberos(struct sess_data * sess_data)1388 sess_auth_kerberos(struct sess_data *sess_data)
1389 {
1390 int rc = 0;
1391 struct smb_hdr *smb_buf;
1392 SESSION_SETUP_ANDX *pSMB;
1393 char *bcc_ptr;
1394 struct cifs_ses *ses = sess_data->ses;
1395 struct TCP_Server_Info *server = sess_data->server;
1396 __u32 capabilities;
1397 __u16 bytes_remaining;
1398 struct key *spnego_key = NULL;
1399 struct cifs_spnego_msg *msg;
1400 u16 blob_len;
1401
1402 /* extended security */
1403 /* wct = 12 */
1404 rc = sess_alloc_buffer(sess_data, 12);
1405 if (rc)
1406 goto out;
1407
1408 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1409 bcc_ptr = sess_data->iov[2].iov_base;
1410 capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1411
1412 spnego_key = cifs_get_spnego_key(ses, server);
1413 if (IS_ERR(spnego_key)) {
1414 rc = PTR_ERR(spnego_key);
1415 spnego_key = NULL;
1416 goto out;
1417 }
1418
1419 msg = spnego_key->payload.data[0];
1420 /*
1421 * check version field to make sure that cifs.upcall is
1422 * sending us a response in an expected form
1423 */
1424 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1425 cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n",
1426 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1427 rc = -EKEYREJECTED;
1428 goto out_put_spnego_key;
1429 }
1430
1431 kfree_sensitive(ses->auth_key.response);
1432 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1433 GFP_KERNEL);
1434 if (!ses->auth_key.response) {
1435 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1436 msg->sesskey_len);
1437 rc = -ENOMEM;
1438 goto out_put_spnego_key;
1439 }
1440 ses->auth_key.len = msg->sesskey_len;
1441
1442 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1443 capabilities |= CAP_EXTENDED_SECURITY;
1444 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1445 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1446 sess_data->iov[1].iov_len = msg->secblob_len;
1447 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1448
1449 if (ses->capabilities & CAP_UNICODE) {
1450 /* unicode strings must be word aligned */
1451 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
1452 *bcc_ptr = 0;
1453 bcc_ptr++;
1454 }
1455 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1456 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1457 } else {
1458 /* BB: is this right? */
1459 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1460 }
1461
1462 sess_data->iov[2].iov_len = (long) bcc_ptr -
1463 (long) sess_data->iov[2].iov_base;
1464
1465 rc = sess_sendreceive(sess_data);
1466 if (rc)
1467 goto out_put_spnego_key;
1468
1469 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1470 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1471
1472 if (smb_buf->WordCount != 4) {
1473 rc = -EIO;
1474 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1475 goto out_put_spnego_key;
1476 }
1477
1478 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1479 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1480
1481 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1482 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1483
1484 bytes_remaining = get_bcc(smb_buf);
1485 bcc_ptr = pByteArea(smb_buf);
1486
1487 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1488 if (blob_len > bytes_remaining) {
1489 cifs_dbg(VFS, "bad security blob length %d\n",
1490 blob_len);
1491 rc = -EINVAL;
1492 goto out_put_spnego_key;
1493 }
1494 bcc_ptr += blob_len;
1495 bytes_remaining -= blob_len;
1496
1497 /* BB check if Unicode and decode strings */
1498 if (bytes_remaining == 0) {
1499 /* no string area to decode, do nothing */
1500 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1501 /* unicode string area must be word-aligned */
1502 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1503 ++bcc_ptr;
1504 --bytes_remaining;
1505 }
1506 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1507 sess_data->nls_cp);
1508 } else {
1509 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1510 sess_data->nls_cp);
1511 }
1512
1513 rc = sess_establish_session(sess_data);
1514 out_put_spnego_key:
1515 key_invalidate(spnego_key);
1516 key_put(spnego_key);
1517 out:
1518 sess_data->result = rc;
1519 sess_data->func = NULL;
1520 sess_free_buffer(sess_data);
1521 kfree_sensitive(ses->auth_key.response);
1522 ses->auth_key.response = NULL;
1523 }
1524
1525 #endif /* ! CONFIG_CIFS_UPCALL */
1526
1527 /*
1528 * The required kvec buffers have to be allocated before calling this
1529 * function.
1530 */
1531 static int
_sess_auth_rawntlmssp_assemble_req(struct sess_data * sess_data)1532 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1533 {
1534 SESSION_SETUP_ANDX *pSMB;
1535 struct cifs_ses *ses = sess_data->ses;
1536 struct TCP_Server_Info *server = sess_data->server;
1537 __u32 capabilities;
1538 char *bcc_ptr;
1539
1540 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1541
1542 capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1543 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1544 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1545 return -ENOSYS;
1546 }
1547
1548 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1549 capabilities |= CAP_EXTENDED_SECURITY;
1550 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1551
1552 bcc_ptr = sess_data->iov[2].iov_base;
1553 /* unicode strings must be word aligned */
1554 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
1555 *bcc_ptr = 0;
1556 bcc_ptr++;
1557 }
1558 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1559
1560 sess_data->iov[2].iov_len = (long) bcc_ptr -
1561 (long) sess_data->iov[2].iov_base;
1562
1563 return 0;
1564 }
1565
1566 static void
1567 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1568
1569 static void
sess_auth_rawntlmssp_negotiate(struct sess_data * sess_data)1570 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1571 {
1572 int rc;
1573 struct smb_hdr *smb_buf;
1574 SESSION_SETUP_ANDX *pSMB;
1575 struct cifs_ses *ses = sess_data->ses;
1576 struct TCP_Server_Info *server = sess_data->server;
1577 __u16 bytes_remaining;
1578 char *bcc_ptr;
1579 unsigned char *ntlmsspblob = NULL;
1580 u16 blob_len;
1581
1582 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1583
1584 /*
1585 * if memory allocation is successful, caller of this function
1586 * frees it.
1587 */
1588 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1589 if (!ses->ntlmssp) {
1590 rc = -ENOMEM;
1591 goto out;
1592 }
1593 ses->ntlmssp->sesskey_per_smbsess = false;
1594
1595 /* wct = 12 */
1596 rc = sess_alloc_buffer(sess_data, 12);
1597 if (rc)
1598 goto out;
1599
1600 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1601
1602 /* Build security blob before we assemble the request */
1603 rc = build_ntlmssp_negotiate_blob(&ntlmsspblob,
1604 &blob_len, ses, server,
1605 sess_data->nls_cp);
1606 if (rc)
1607 goto out_free_ntlmsspblob;
1608
1609 sess_data->iov[1].iov_len = blob_len;
1610 sess_data->iov[1].iov_base = ntlmsspblob;
1611 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1612
1613 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1614 if (rc)
1615 goto out_free_ntlmsspblob;
1616
1617 rc = sess_sendreceive(sess_data);
1618
1619 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1620 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1621
1622 /* If true, rc here is expected and not an error */
1623 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1624 smb_buf->Status.CifsError ==
1625 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1626 rc = 0;
1627
1628 if (rc)
1629 goto out_free_ntlmsspblob;
1630
1631 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1632
1633 if (smb_buf->WordCount != 4) {
1634 rc = -EIO;
1635 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1636 goto out_free_ntlmsspblob;
1637 }
1638
1639 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1640 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1641
1642 bytes_remaining = get_bcc(smb_buf);
1643 bcc_ptr = pByteArea(smb_buf);
1644
1645 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1646 if (blob_len > bytes_remaining) {
1647 cifs_dbg(VFS, "bad security blob length %d\n",
1648 blob_len);
1649 rc = -EINVAL;
1650 goto out_free_ntlmsspblob;
1651 }
1652
1653 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1654
1655 out_free_ntlmsspblob:
1656 kfree_sensitive(ntlmsspblob);
1657 out:
1658 sess_free_buffer(sess_data);
1659
1660 if (!rc) {
1661 sess_data->func = sess_auth_rawntlmssp_authenticate;
1662 return;
1663 }
1664
1665 /* Else error. Cleanup */
1666 kfree_sensitive(ses->auth_key.response);
1667 ses->auth_key.response = NULL;
1668 kfree_sensitive(ses->ntlmssp);
1669 ses->ntlmssp = NULL;
1670
1671 sess_data->func = NULL;
1672 sess_data->result = rc;
1673 }
1674
1675 static void
sess_auth_rawntlmssp_authenticate(struct sess_data * sess_data)1676 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1677 {
1678 int rc;
1679 struct smb_hdr *smb_buf;
1680 SESSION_SETUP_ANDX *pSMB;
1681 struct cifs_ses *ses = sess_data->ses;
1682 struct TCP_Server_Info *server = sess_data->server;
1683 __u16 bytes_remaining;
1684 char *bcc_ptr;
1685 unsigned char *ntlmsspblob = NULL;
1686 u16 blob_len;
1687
1688 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1689
1690 /* wct = 12 */
1691 rc = sess_alloc_buffer(sess_data, 12);
1692 if (rc)
1693 goto out;
1694
1695 /* Build security blob before we assemble the request */
1696 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1697 smb_buf = (struct smb_hdr *)pSMB;
1698 rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1699 &blob_len, ses, server,
1700 sess_data->nls_cp);
1701 if (rc)
1702 goto out_free_ntlmsspblob;
1703 sess_data->iov[1].iov_len = blob_len;
1704 sess_data->iov[1].iov_base = ntlmsspblob;
1705 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1706 /*
1707 * Make sure that we tell the server that we are using
1708 * the uid that it just gave us back on the response
1709 * (challenge)
1710 */
1711 smb_buf->Uid = ses->Suid;
1712
1713 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1714 if (rc)
1715 goto out_free_ntlmsspblob;
1716
1717 rc = sess_sendreceive(sess_data);
1718 if (rc)
1719 goto out_free_ntlmsspblob;
1720
1721 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1722 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1723 if (smb_buf->WordCount != 4) {
1724 rc = -EIO;
1725 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1726 goto out_free_ntlmsspblob;
1727 }
1728
1729 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1730 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1731
1732 if (ses->Suid != smb_buf->Uid) {
1733 ses->Suid = smb_buf->Uid;
1734 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1735 }
1736
1737 bytes_remaining = get_bcc(smb_buf);
1738 bcc_ptr = pByteArea(smb_buf);
1739 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1740 if (blob_len > bytes_remaining) {
1741 cifs_dbg(VFS, "bad security blob length %d\n",
1742 blob_len);
1743 rc = -EINVAL;
1744 goto out_free_ntlmsspblob;
1745 }
1746 bcc_ptr += blob_len;
1747 bytes_remaining -= blob_len;
1748
1749
1750 /* BB check if Unicode and decode strings */
1751 if (bytes_remaining == 0) {
1752 /* no string area to decode, do nothing */
1753 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1754 /* unicode string area must be word-aligned */
1755 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1756 ++bcc_ptr;
1757 --bytes_remaining;
1758 }
1759 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1760 sess_data->nls_cp);
1761 } else {
1762 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1763 sess_data->nls_cp);
1764 }
1765
1766 out_free_ntlmsspblob:
1767 kfree_sensitive(ntlmsspblob);
1768 out:
1769 sess_free_buffer(sess_data);
1770
1771 if (!rc)
1772 rc = sess_establish_session(sess_data);
1773
1774 /* Cleanup */
1775 kfree_sensitive(ses->auth_key.response);
1776 ses->auth_key.response = NULL;
1777 kfree_sensitive(ses->ntlmssp);
1778 ses->ntlmssp = NULL;
1779
1780 sess_data->func = NULL;
1781 sess_data->result = rc;
1782 }
1783
select_sec(struct sess_data * sess_data)1784 static int select_sec(struct sess_data *sess_data)
1785 {
1786 int type;
1787 struct cifs_ses *ses = sess_data->ses;
1788 struct TCP_Server_Info *server = sess_data->server;
1789
1790 type = cifs_select_sectype(server, ses->sectype);
1791 cifs_dbg(FYI, "sess setup type %d\n", type);
1792 if (type == Unspecified) {
1793 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1794 return -EINVAL;
1795 }
1796
1797 switch (type) {
1798 case NTLMv2:
1799 sess_data->func = sess_auth_ntlmv2;
1800 break;
1801 case Kerberos:
1802 #ifdef CONFIG_CIFS_UPCALL
1803 sess_data->func = sess_auth_kerberos;
1804 break;
1805 #else
1806 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1807 return -ENOSYS;
1808 #endif /* CONFIG_CIFS_UPCALL */
1809 case RawNTLMSSP:
1810 sess_data->func = sess_auth_rawntlmssp_negotiate;
1811 break;
1812 default:
1813 cifs_dbg(VFS, "secType %d not supported!\n", type);
1814 return -ENOSYS;
1815 }
1816
1817 return 0;
1818 }
1819
CIFS_SessSetup(const unsigned int xid,struct cifs_ses * ses,struct TCP_Server_Info * server,const struct nls_table * nls_cp)1820 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1821 struct TCP_Server_Info *server,
1822 const struct nls_table *nls_cp)
1823 {
1824 int rc = 0;
1825 struct sess_data *sess_data;
1826
1827 if (ses == NULL) {
1828 WARN(1, "%s: ses == NULL!", __func__);
1829 return -EINVAL;
1830 }
1831
1832 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1833 if (!sess_data)
1834 return -ENOMEM;
1835
1836 sess_data->xid = xid;
1837 sess_data->ses = ses;
1838 sess_data->server = server;
1839 sess_data->buf0_type = CIFS_NO_BUFFER;
1840 sess_data->nls_cp = (struct nls_table *) nls_cp;
1841
1842 rc = select_sec(sess_data);
1843 if (rc)
1844 goto out;
1845
1846 while (sess_data->func)
1847 sess_data->func(sess_data);
1848
1849 /* Store result before we free sess_data */
1850 rc = sess_data->result;
1851
1852 out:
1853 kfree_sensitive(sess_data);
1854 return rc;
1855 }
1856 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1857