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12#include "cifspdu.h"
13#include "cifsglob.h"
14#include "cifsproto.h"
15#include "cifs_unicode.h"
16#include "cifs_debug.h"
17#include "ntlmssp.h"
18#include "nterr.h"
19#include <linux/utsname.h>
20#include <linux/slab.h>
21#include "cifs_spnego.h"
22#include "smb2proto.h"
23#include "fs_context.h"
24
25static int
26cifs_ses_add_channel(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
27 struct cifs_server_iface *iface);
28
29bool
30is_server_using_iface(struct TCP_Server_Info *server,
31 struct cifs_server_iface *iface)
32{
33 struct sockaddr_in *i4 = (struct sockaddr_in *)&iface->sockaddr;
34 struct sockaddr_in6 *i6 = (struct sockaddr_in6 *)&iface->sockaddr;
35 struct sockaddr_in *s4 = (struct sockaddr_in *)&server->dstaddr;
36 struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)&server->dstaddr;
37
38 if (server->dstaddr.ss_family != iface->sockaddr.ss_family)
39 return false;
40 if (server->dstaddr.ss_family == AF_INET) {
41 if (s4->sin_addr.s_addr != i4->sin_addr.s_addr)
42 return false;
43 } else if (server->dstaddr.ss_family == AF_INET6) {
44 if (memcmp(&s6->sin6_addr, &i6->sin6_addr,
45 sizeof(i6->sin6_addr)) != 0)
46 return false;
47 } else {
48
49 return false;
50 }
51 return true;
52}
53
54bool is_ses_using_iface(struct cifs_ses *ses, struct cifs_server_iface *iface)
55{
56 int i;
57
58 for (i = 0; i < ses->chan_count; i++) {
59 if (is_server_using_iface(ses->chans[i].server, iface))
60 return true;
61 }
62 return false;
63}
64
65
66int cifs_try_adding_channels(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses)
67{
68 int old_chan_count = ses->chan_count;
69 int left = ses->chan_max - ses->chan_count;
70 int i = 0;
71 int rc = 0;
72 int tries = 0;
73 struct cifs_server_iface *ifaces = NULL;
74 size_t iface_count;
75
76 if (left <= 0) {
77 cifs_dbg(FYI,
78 "ses already at max_channels (%zu), nothing to open\n",
79 ses->chan_max);
80 return 0;
81 }
82
83 if (ses->server->dialect < SMB30_PROT_ID) {
84 cifs_dbg(VFS, "multichannel is not supported on this protocol version, use 3.0 or above\n");
85 return 0;
86 }
87
88 if (!(ses->server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
89 cifs_dbg(VFS, "server %s does not support multichannel\n", ses->server->hostname);
90 ses->chan_max = 1;
91 return 0;
92 }
93
94
95
96
97
98
99 spin_lock(&ses->iface_lock);
100 iface_count = ses->iface_count;
101 if (iface_count <= 0) {
102 spin_unlock(&ses->iface_lock);
103 cifs_dbg(VFS, "no iface list available to open channels\n");
104 return 0;
105 }
106 ifaces = kmemdup(ses->iface_list, iface_count*sizeof(*ifaces),
107 GFP_ATOMIC);
108 if (!ifaces) {
109 spin_unlock(&ses->iface_lock);
110 return 0;
111 }
112 spin_unlock(&ses->iface_lock);
113
114
115
116
117
118
119 while (left > 0) {
120 struct cifs_server_iface *iface;
121
122 tries++;
123 if (tries > 3*ses->chan_max) {
124 cifs_dbg(FYI, "too many channel open attempts (%d channels left to open)\n",
125 left);
126 break;
127 }
128
129 iface = &ifaces[i];
130 if (is_ses_using_iface(ses, iface) && !iface->rss_capable) {
131 i = (i+1) % iface_count;
132 continue;
133 }
134
135 rc = cifs_ses_add_channel(cifs_sb, ses, iface);
136 if (rc) {
137 cifs_dbg(FYI, "failed to open extra channel on iface#%d rc=%d\n",
138 i, rc);
139 i = (i+1) % iface_count;
140 continue;
141 }
142
143 cifs_dbg(FYI, "successfully opened new channel on iface#%d\n",
144 i);
145 left--;
146 }
147
148 kfree(ifaces);
149 return ses->chan_count - old_chan_count;
150}
151
152
153
154
155
156struct cifs_chan *
157cifs_ses_find_chan(struct cifs_ses *ses, struct TCP_Server_Info *server)
158{
159 int i;
160
161 for (i = 0; i < ses->chan_count; i++) {
162 if (ses->chans[i].server == server)
163 return &ses->chans[i];
164 }
165 return NULL;
166}
167
168static int
169cifs_ses_add_channel(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
170 struct cifs_server_iface *iface)
171{
172 struct cifs_chan *chan;
173 struct smb3_fs_context ctx = {NULL};
174 static const char unc_fmt[] = "\\%s\\foo";
175 char unc[sizeof(unc_fmt)+SERVER_NAME_LEN_WITH_NULL] = {0};
176 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;
177 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;
178 int rc;
179 unsigned int xid = get_xid();
180
181 if (iface->sockaddr.ss_family == AF_INET)
182 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI4)\n",
183 ses, iface->speed, iface->rdma_capable ? "yes" : "no",
184 &ipv4->sin_addr);
185 else
186 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI6)\n",
187 ses, iface->speed, iface->rdma_capable ? "yes" : "no",
188 &ipv6->sin6_addr);
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203 ctx.nosharesock = true;
204
205
206 ctx.domainauto = ses->domainAuto;
207 ctx.domainname = ses->domainName;
208 ctx.username = ses->user_name;
209 ctx.password = ses->password;
210 ctx.sectype = ses->sectype;
211 ctx.sign = ses->sign;
212
213
214
215 sprintf(unc, unc_fmt, ses->ip_addr);
216 ctx.UNC = unc;
217 ctx.prepath = "";
218
219
220 ctx.vals = ses->server->vals;
221 ctx.ops = ses->server->ops;
222
223 ctx.noblocksnd = ses->server->noblocksnd;
224 ctx.noautotune = ses->server->noautotune;
225 ctx.sockopt_tcp_nodelay = ses->server->tcp_nodelay;
226 ctx.echo_interval = ses->server->echo_interval / HZ;
227 ctx.max_credits = ses->server->max_credits;
228
229
230
231
232
233 ctx.local_nls = cifs_sb->local_nls;
234
235
236 ctx.rdma = iface->rdma_capable;
237 memcpy(&ctx.dstaddr, &iface->sockaddr, sizeof(struct sockaddr_storage));
238
239
240 memcpy(&ctx.client_guid, ses->server->client_guid,
241 SMB2_CLIENT_GUID_SIZE);
242 ctx.use_client_guid = true;
243
244 mutex_lock(&ses->session_mutex);
245
246 chan = ses->binding_chan = &ses->chans[ses->chan_count];
247 chan->server = cifs_get_tcp_session(&ctx);
248 if (IS_ERR(chan->server)) {
249 rc = PTR_ERR(chan->server);
250 chan->server = NULL;
251 goto out;
252 }
253 spin_lock(&cifs_tcp_ses_lock);
254 chan->server->is_channel = true;
255 spin_unlock(&cifs_tcp_ses_lock);
256
257
258
259
260
261
262 rc = smb311_crypto_shash_allocate(chan->server);
263 if (rc) {
264 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
265 goto out;
266 }
267
268 ses->binding = true;
269 rc = cifs_negotiate_protocol(xid, ses);
270 if (rc)
271 goto out;
272
273 rc = cifs_setup_session(xid, ses, cifs_sb->local_nls);
274 if (rc)
275 goto out;
276
277
278
279
280
281
282
283
284
285
286
287 ses->chan_count++;
288 atomic_set(&ses->chan_seq, 0);
289out:
290 ses->binding = false;
291 ses->binding_chan = NULL;
292 mutex_unlock(&ses->session_mutex);
293
294 if (rc && chan->server)
295 cifs_put_tcp_session(chan->server, 0);
296
297 return rc;
298}
299
300static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB)
301{
302 __u32 capabilities = 0;
303
304
305
306
307
308
309 pSMB->req.AndXCommand = 0xFF;
310 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
311 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
312 USHRT_MAX));
313 pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
314 pSMB->req.VcNumber = cpu_to_le16(1);
315
316
317
318
319
320
321 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
322 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
323
324 if (ses->server->sign)
325 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
326
327 if (ses->capabilities & CAP_UNICODE) {
328 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
329 capabilities |= CAP_UNICODE;
330 }
331 if (ses->capabilities & CAP_STATUS32) {
332 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
333 capabilities |= CAP_STATUS32;
334 }
335 if (ses->capabilities & CAP_DFS) {
336 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
337 capabilities |= CAP_DFS;
338 }
339 if (ses->capabilities & CAP_UNIX)
340 capabilities |= CAP_UNIX;
341
342 return capabilities;
343}
344
345static void
346unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
347{
348 char *bcc_ptr = *pbcc_area;
349 int bytes_ret = 0;
350
351
352 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
353 nls_cp);
354 bcc_ptr += 2 * bytes_ret;
355 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
356 32, nls_cp);
357 bcc_ptr += 2 * bytes_ret;
358 bcc_ptr += 2;
359
360 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
361 32, nls_cp);
362 bcc_ptr += 2 * bytes_ret;
363 bcc_ptr += 2;
364
365 *pbcc_area = bcc_ptr;
366}
367
368static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
369 const struct nls_table *nls_cp)
370{
371 char *bcc_ptr = *pbcc_area;
372 int bytes_ret = 0;
373
374
375 if (ses->domainName == NULL) {
376
377
378 *bcc_ptr = 0;
379 *(bcc_ptr+1) = 0;
380 bytes_ret = 0;
381 } else
382 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
383 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
384 bcc_ptr += 2 * bytes_ret;
385 bcc_ptr += 2;
386
387 *pbcc_area = bcc_ptr;
388}
389
390
391static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
392 const struct nls_table *nls_cp)
393{
394 char *bcc_ptr = *pbcc_area;
395 int bytes_ret = 0;
396
397
398
399
400
401
402
403
404
405
406 if (ses->user_name == NULL) {
407
408 *bcc_ptr = 0;
409 *(bcc_ptr+1) = 0;
410 } else {
411 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
412 CIFS_MAX_USERNAME_LEN, nls_cp);
413 }
414 bcc_ptr += 2 * bytes_ret;
415 bcc_ptr += 2;
416
417 unicode_domain_string(&bcc_ptr, ses, nls_cp);
418 unicode_oslm_strings(&bcc_ptr, nls_cp);
419
420 *pbcc_area = bcc_ptr;
421}
422
423static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
424 const struct nls_table *nls_cp)
425{
426 char *bcc_ptr = *pbcc_area;
427 int len;
428
429
430
431
432 if (ses->user_name != NULL) {
433 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
434 if (WARN_ON_ONCE(len < 0))
435 len = CIFS_MAX_USERNAME_LEN - 1;
436 bcc_ptr += len;
437 }
438
439 *bcc_ptr = 0;
440 bcc_ptr++;
441
442
443 if (ses->domainName != NULL) {
444 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
445 if (WARN_ON_ONCE(len < 0))
446 len = CIFS_MAX_DOMAINNAME_LEN - 1;
447 bcc_ptr += len;
448 }
449
450 *bcc_ptr = 0;
451 bcc_ptr++;
452
453
454
455 strcpy(bcc_ptr, "Linux version ");
456 bcc_ptr += strlen("Linux version ");
457 strcpy(bcc_ptr, init_utsname()->release);
458 bcc_ptr += strlen(init_utsname()->release) + 1;
459
460 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
461 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
462
463 *pbcc_area = bcc_ptr;
464}
465
466static void
467decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
468 const struct nls_table *nls_cp)
469{
470 int len;
471 char *data = *pbcc_area;
472
473 cifs_dbg(FYI, "bleft %d\n", bleft);
474
475 kfree(ses->serverOS);
476 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
477 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
478 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
479 data += len;
480 bleft -= len;
481 if (bleft <= 0)
482 return;
483
484 kfree(ses->serverNOS);
485 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
486 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
487 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
488 data += len;
489 bleft -= len;
490 if (bleft <= 0)
491 return;
492
493 kfree(ses->serverDomain);
494 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
495 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
496
497 return;
498}
499
500static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
501 struct cifs_ses *ses,
502 const struct nls_table *nls_cp)
503{
504 int len;
505 char *bcc_ptr = *pbcc_area;
506
507 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
508
509 len = strnlen(bcc_ptr, bleft);
510 if (len >= bleft)
511 return;
512
513 kfree(ses->serverOS);
514
515 ses->serverOS = kmalloc(len + 1, GFP_KERNEL);
516 if (ses->serverOS) {
517 memcpy(ses->serverOS, bcc_ptr, len);
518 ses->serverOS[len] = 0;
519 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
520 cifs_dbg(FYI, "OS/2 server\n");
521 }
522
523 bcc_ptr += len + 1;
524 bleft -= len + 1;
525
526 len = strnlen(bcc_ptr, bleft);
527 if (len >= bleft)
528 return;
529
530 kfree(ses->serverNOS);
531
532 ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);
533 if (ses->serverNOS) {
534 memcpy(ses->serverNOS, bcc_ptr, len);
535 ses->serverNOS[len] = 0;
536 }
537
538 bcc_ptr += len + 1;
539 bleft -= len + 1;
540
541 len = strnlen(bcc_ptr, bleft);
542 if (len > bleft)
543 return;
544
545
546
547
548
549
550 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
551}
552
553int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
554 struct cifs_ses *ses)
555{
556 unsigned int tioffset;
557 unsigned int tilen;
558
559 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
560
561 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
562 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
563 return -EINVAL;
564 }
565
566 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
567 cifs_dbg(VFS, "blob signature incorrect %s\n",
568 pblob->Signature);
569 return -EINVAL;
570 }
571 if (pblob->MessageType != NtLmChallenge) {
572 cifs_dbg(VFS, "Incorrect message type %d\n",
573 pblob->MessageType);
574 return -EINVAL;
575 }
576
577 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
578
579
580
581
582 ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags);
583 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
584 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
585 if (tioffset > blob_len || tioffset + tilen > blob_len) {
586 cifs_dbg(VFS, "tioffset + tilen too high %u + %u\n",
587 tioffset, tilen);
588 return -EINVAL;
589 }
590 if (tilen) {
591 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
592 GFP_KERNEL);
593 if (!ses->auth_key.response) {
594 cifs_dbg(VFS, "Challenge target info alloc failure\n");
595 return -ENOMEM;
596 }
597 ses->auth_key.len = tilen;
598 }
599
600 return 0;
601}
602
603
604
605
606
607void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
608 struct cifs_ses *ses)
609{
610 struct TCP_Server_Info *server = cifs_ses_server(ses);
611 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer;
612 __u32 flags;
613
614 memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
615 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
616 sec_blob->MessageType = NtLmNegotiate;
617
618
619 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
620 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
621 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
622 NTLMSSP_NEGOTIATE_SEAL;
623 if (server->sign)
624 flags |= NTLMSSP_NEGOTIATE_SIGN;
625 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
626 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
627
628 sec_blob->NegotiateFlags = cpu_to_le32(flags);
629
630 sec_blob->WorkstationName.BufferOffset = 0;
631 sec_blob->WorkstationName.Length = 0;
632 sec_blob->WorkstationName.MaximumLength = 0;
633
634
635 sec_blob->DomainName.BufferOffset = 0;
636 sec_blob->DomainName.Length = 0;
637 sec_blob->DomainName.MaximumLength = 0;
638}
639
640static int size_of_ntlmssp_blob(struct cifs_ses *ses)
641{
642 int sz = sizeof(AUTHENTICATE_MESSAGE) + ses->auth_key.len
643 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
644
645 if (ses->domainName)
646 sz += 2 * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
647 else
648 sz += 2;
649
650 if (ses->user_name)
651 sz += 2 * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
652 else
653 sz += 2;
654
655 return sz;
656}
657
658int build_ntlmssp_auth_blob(unsigned char **pbuffer,
659 u16 *buflen,
660 struct cifs_ses *ses,
661 const struct nls_table *nls_cp)
662{
663 int rc;
664 AUTHENTICATE_MESSAGE *sec_blob;
665 __u32 flags;
666 unsigned char *tmp;
667
668 rc = setup_ntlmv2_rsp(ses, nls_cp);
669 if (rc) {
670 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
671 *buflen = 0;
672 goto setup_ntlmv2_ret;
673 }
674 *pbuffer = kmalloc(size_of_ntlmssp_blob(ses), GFP_KERNEL);
675 if (!*pbuffer) {
676 rc = -ENOMEM;
677 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
678 *buflen = 0;
679 goto setup_ntlmv2_ret;
680 }
681 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
682
683 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
684 sec_blob->MessageType = NtLmAuthenticate;
685
686 flags = NTLMSSP_NEGOTIATE_56 |
687 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
688 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
689 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
690 NTLMSSP_NEGOTIATE_SEAL;
691 if (ses->server->sign)
692 flags |= NTLMSSP_NEGOTIATE_SIGN;
693 if (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
694 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
695
696 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
697 sec_blob->NegotiateFlags = cpu_to_le32(flags);
698
699 sec_blob->LmChallengeResponse.BufferOffset =
700 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
701 sec_blob->LmChallengeResponse.Length = 0;
702 sec_blob->LmChallengeResponse.MaximumLength = 0;
703
704 sec_blob->NtChallengeResponse.BufferOffset =
705 cpu_to_le32(tmp - *pbuffer);
706 if (ses->user_name != NULL) {
707 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
708 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
709 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
710
711 sec_blob->NtChallengeResponse.Length =
712 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
713 sec_blob->NtChallengeResponse.MaximumLength =
714 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
715 } else {
716
717
718
719 sec_blob->NtChallengeResponse.Length = 0;
720 sec_blob->NtChallengeResponse.MaximumLength = 0;
721 }
722
723 if (ses->domainName == NULL) {
724 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
725 sec_blob->DomainName.Length = 0;
726 sec_blob->DomainName.MaximumLength = 0;
727 tmp += 2;
728 } else {
729 int len;
730 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
731 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
732 len *= 2;
733 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
734 sec_blob->DomainName.Length = cpu_to_le16(len);
735 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
736 tmp += len;
737 }
738
739 if (ses->user_name == NULL) {
740 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
741 sec_blob->UserName.Length = 0;
742 sec_blob->UserName.MaximumLength = 0;
743 tmp += 2;
744 } else {
745 int len;
746 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
747 CIFS_MAX_USERNAME_LEN, nls_cp);
748 len *= 2;
749 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
750 sec_blob->UserName.Length = cpu_to_le16(len);
751 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
752 tmp += len;
753 }
754
755 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
756 sec_blob->WorkstationName.Length = 0;
757 sec_blob->WorkstationName.MaximumLength = 0;
758 tmp += 2;
759
760 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
761 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
762 && !calc_seckey(ses)) {
763 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
764 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
765 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
766 sec_blob->SessionKey.MaximumLength =
767 cpu_to_le16(CIFS_CPHTXT_SIZE);
768 tmp += CIFS_CPHTXT_SIZE;
769 } else {
770 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
771 sec_blob->SessionKey.Length = 0;
772 sec_blob->SessionKey.MaximumLength = 0;
773 }
774
775 *buflen = tmp - *pbuffer;
776setup_ntlmv2_ret:
777 return rc;
778}
779
780enum securityEnum
781cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
782{
783 switch (server->negflavor) {
784 case CIFS_NEGFLAVOR_EXTENDED:
785 switch (requested) {
786 case Kerberos:
787 case RawNTLMSSP:
788 return requested;
789 case Unspecified:
790 if (server->sec_ntlmssp &&
791 (global_secflags & CIFSSEC_MAY_NTLMSSP))
792 return RawNTLMSSP;
793 if ((server->sec_kerberos || server->sec_mskerberos) &&
794 (global_secflags & CIFSSEC_MAY_KRB5))
795 return Kerberos;
796 fallthrough;
797 default:
798 return Unspecified;
799 }
800 case CIFS_NEGFLAVOR_UNENCAP:
801 switch (requested) {
802 case NTLM:
803 case NTLMv2:
804 return requested;
805 case Unspecified:
806 if (global_secflags & CIFSSEC_MAY_NTLMV2)
807 return NTLMv2;
808 if (global_secflags & CIFSSEC_MAY_NTLM)
809 return NTLM;
810 break;
811 default:
812 break;
813 }
814 fallthrough;
815 case CIFS_NEGFLAVOR_LANMAN:
816 switch (requested) {
817 case LANMAN:
818 return requested;
819 case Unspecified:
820 if (global_secflags & CIFSSEC_MAY_LANMAN)
821 return LANMAN;
822 fallthrough;
823 default:
824 return Unspecified;
825 }
826 default:
827 return Unspecified;
828 }
829}
830
831struct sess_data {
832 unsigned int xid;
833 struct cifs_ses *ses;
834 struct nls_table *nls_cp;
835 void (*func)(struct sess_data *);
836 int result;
837
838
839
840
841
842
843
844
845 int buf0_type;
846 struct kvec iov[3];
847};
848
849static int
850sess_alloc_buffer(struct sess_data *sess_data, int wct)
851{
852 int rc;
853 struct cifs_ses *ses = sess_data->ses;
854 struct smb_hdr *smb_buf;
855
856 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
857 (void **)&smb_buf);
858
859 if (rc)
860 return rc;
861
862 sess_data->iov[0].iov_base = (char *)smb_buf;
863 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
864
865
866
867
868 sess_data->buf0_type = CIFS_SMALL_BUFFER;
869
870
871 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
872 if (!sess_data->iov[2].iov_base) {
873 rc = -ENOMEM;
874 goto out_free_smb_buf;
875 }
876
877 return 0;
878
879out_free_smb_buf:
880 kfree(smb_buf);
881 sess_data->iov[0].iov_base = NULL;
882 sess_data->iov[0].iov_len = 0;
883 sess_data->buf0_type = CIFS_NO_BUFFER;
884 return rc;
885}
886
887static void
888sess_free_buffer(struct sess_data *sess_data)
889{
890
891 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
892 sess_data->buf0_type = CIFS_NO_BUFFER;
893 kfree(sess_data->iov[2].iov_base);
894}
895
896static int
897sess_establish_session(struct sess_data *sess_data)
898{
899 struct cifs_ses *ses = sess_data->ses;
900
901 mutex_lock(&ses->server->srv_mutex);
902 if (!ses->server->session_estab) {
903 if (ses->server->sign) {
904 ses->server->session_key.response =
905 kmemdup(ses->auth_key.response,
906 ses->auth_key.len, GFP_KERNEL);
907 if (!ses->server->session_key.response) {
908 mutex_unlock(&ses->server->srv_mutex);
909 return -ENOMEM;
910 }
911 ses->server->session_key.len =
912 ses->auth_key.len;
913 }
914 ses->server->sequence_number = 0x2;
915 ses->server->session_estab = true;
916 }
917 mutex_unlock(&ses->server->srv_mutex);
918
919 cifs_dbg(FYI, "CIFS session established successfully\n");
920 spin_lock(&GlobalMid_Lock);
921 ses->status = CifsGood;
922 ses->need_reconnect = false;
923 spin_unlock(&GlobalMid_Lock);
924
925 return 0;
926}
927
928static int
929sess_sendreceive(struct sess_data *sess_data)
930{
931 int rc;
932 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
933 __u16 count;
934 struct kvec rsp_iov = { NULL, 0 };
935
936 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
937 be32_add_cpu(&smb_buf->smb_buf_length, count);
938 put_bcc(count, smb_buf);
939
940 rc = SendReceive2(sess_data->xid, sess_data->ses,
941 sess_data->iov, 3 ,
942 &sess_data->buf0_type,
943 CIFS_LOG_ERROR, &rsp_iov);
944 cifs_small_buf_release(sess_data->iov[0].iov_base);
945 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
946
947 return rc;
948}
949
950
951
952
953
954
955
956
957#ifdef CONFIG_CIFS_WEAK_PW_HASH
958static void
959sess_auth_lanman(struct sess_data *sess_data)
960{
961 int rc = 0;
962 struct smb_hdr *smb_buf;
963 SESSION_SETUP_ANDX *pSMB;
964 char *bcc_ptr;
965 struct cifs_ses *ses = sess_data->ses;
966 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
967 __u16 bytes_remaining;
968
969
970
971 rc = sess_alloc_buffer(sess_data, 10);
972 if (rc)
973 goto out;
974
975 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
976 bcc_ptr = sess_data->iov[2].iov_base;
977 (void)cifs_ssetup_hdr(ses, pSMB);
978
979 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
980
981 if (ses->user_name != NULL) {
982
983 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
984
985
986
987
988
989
990 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
991 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
992 true : false, lnm_session_key);
993 if (rc)
994 goto out;
995
996 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
997 bcc_ptr += CIFS_AUTH_RESP_SIZE;
998 } else {
999 pSMB->old_req.PasswordLength = 0;
1000 }
1001
1002
1003
1004
1005
1006
1007
1008
1009 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
1010
1011 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1012
1013 sess_data->iov[2].iov_len = (long) bcc_ptr -
1014 (long) sess_data->iov[2].iov_base;
1015
1016 rc = sess_sendreceive(sess_data);
1017 if (rc)
1018 goto out;
1019
1020 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1021 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1022
1023
1024 if (smb_buf->WordCount != 3) {
1025 rc = -EIO;
1026 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1027 goto out;
1028 }
1029
1030 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1031 cifs_dbg(FYI, "Guest login\n");
1032
1033 ses->Suid = smb_buf->Uid;
1034 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1035
1036 bytes_remaining = get_bcc(smb_buf);
1037 bcc_ptr = pByteArea(smb_buf);
1038
1039
1040 if (bytes_remaining == 0) {
1041
1042 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1043
1044 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1045 ++bcc_ptr;
1046 --bytes_remaining;
1047 }
1048 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1049 sess_data->nls_cp);
1050 } else {
1051 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1052 sess_data->nls_cp);
1053 }
1054
1055 rc = sess_establish_session(sess_data);
1056out:
1057 sess_data->result = rc;
1058 sess_data->func = NULL;
1059 sess_free_buffer(sess_data);
1060}
1061
1062#endif
1063
1064static void
1065sess_auth_ntlm(struct sess_data *sess_data)
1066{
1067 int rc = 0;
1068 struct smb_hdr *smb_buf;
1069 SESSION_SETUP_ANDX *pSMB;
1070 char *bcc_ptr;
1071 struct cifs_ses *ses = sess_data->ses;
1072 __u32 capabilities;
1073 __u16 bytes_remaining;
1074
1075
1076
1077 rc = sess_alloc_buffer(sess_data, 13);
1078 if (rc)
1079 goto out;
1080
1081 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1082 bcc_ptr = sess_data->iov[2].iov_base;
1083 capabilities = cifs_ssetup_hdr(ses, pSMB);
1084
1085 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
1086 if (ses->user_name != NULL) {
1087 pSMB->req_no_secext.CaseInsensitivePasswordLength =
1088 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
1089 pSMB->req_no_secext.CaseSensitivePasswordLength =
1090 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
1091
1092
1093 rc = setup_ntlm_response(ses, sess_data->nls_cp);
1094 if (rc) {
1095 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
1096 rc);
1097 goto out;
1098 }
1099
1100
1101 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1102 CIFS_AUTH_RESP_SIZE);
1103 bcc_ptr += CIFS_AUTH_RESP_SIZE;
1104 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1105 CIFS_AUTH_RESP_SIZE);
1106 bcc_ptr += CIFS_AUTH_RESP_SIZE;
1107 } else {
1108 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
1109 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
1110 }
1111
1112 if (ses->capabilities & CAP_UNICODE) {
1113
1114 if (sess_data->iov[0].iov_len % 2) {
1115 *bcc_ptr = 0;
1116 bcc_ptr++;
1117 }
1118 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1119 } else {
1120 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1121 }
1122
1123
1124 sess_data->iov[2].iov_len = (long) bcc_ptr -
1125 (long) sess_data->iov[2].iov_base;
1126
1127 rc = sess_sendreceive(sess_data);
1128 if (rc)
1129 goto out;
1130
1131 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1132 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1133
1134 if (smb_buf->WordCount != 3) {
1135 rc = -EIO;
1136 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1137 goto out;
1138 }
1139
1140 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1141 cifs_dbg(FYI, "Guest login\n");
1142
1143 ses->Suid = smb_buf->Uid;
1144 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1145
1146 bytes_remaining = get_bcc(smb_buf);
1147 bcc_ptr = pByteArea(smb_buf);
1148
1149
1150 if (bytes_remaining == 0) {
1151
1152 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1153
1154 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1155 ++bcc_ptr;
1156 --bytes_remaining;
1157 }
1158 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1159 sess_data->nls_cp);
1160 } else {
1161 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1162 sess_data->nls_cp);
1163 }
1164
1165 rc = sess_establish_session(sess_data);
1166out:
1167 sess_data->result = rc;
1168 sess_data->func = NULL;
1169 sess_free_buffer(sess_data);
1170 kfree(ses->auth_key.response);
1171 ses->auth_key.response = NULL;
1172}
1173
1174static void
1175sess_auth_ntlmv2(struct sess_data *sess_data)
1176{
1177 int rc = 0;
1178 struct smb_hdr *smb_buf;
1179 SESSION_SETUP_ANDX *pSMB;
1180 char *bcc_ptr;
1181 struct cifs_ses *ses = sess_data->ses;
1182 __u32 capabilities;
1183 __u16 bytes_remaining;
1184
1185
1186
1187 rc = sess_alloc_buffer(sess_data, 13);
1188 if (rc)
1189 goto out;
1190
1191 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1192 bcc_ptr = sess_data->iov[2].iov_base;
1193 capabilities = cifs_ssetup_hdr(ses, pSMB);
1194
1195 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
1196
1197
1198 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
1199
1200 if (ses->user_name != NULL) {
1201
1202 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
1203 if (rc) {
1204 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
1205 goto out;
1206 }
1207
1208 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1209 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1210 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1211
1212
1213
1214
1215 pSMB->req_no_secext.CaseSensitivePasswordLength =
1216 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1217 } else {
1218 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
1219 }
1220
1221 if (ses->capabilities & CAP_UNICODE) {
1222 if (sess_data->iov[0].iov_len % 2) {
1223 *bcc_ptr = 0;
1224 bcc_ptr++;
1225 }
1226 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1227 } else {
1228 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1229 }
1230
1231
1232 sess_data->iov[2].iov_len = (long) bcc_ptr -
1233 (long) sess_data->iov[2].iov_base;
1234
1235 rc = sess_sendreceive(sess_data);
1236 if (rc)
1237 goto out;
1238
1239 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1240 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1241
1242 if (smb_buf->WordCount != 3) {
1243 rc = -EIO;
1244 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1245 goto out;
1246 }
1247
1248 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1249 cifs_dbg(FYI, "Guest login\n");
1250
1251 ses->Suid = smb_buf->Uid;
1252 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1253
1254 bytes_remaining = get_bcc(smb_buf);
1255 bcc_ptr = pByteArea(smb_buf);
1256
1257
1258 if (bytes_remaining == 0) {
1259
1260 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1261
1262 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1263 ++bcc_ptr;
1264 --bytes_remaining;
1265 }
1266 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1267 sess_data->nls_cp);
1268 } else {
1269 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1270 sess_data->nls_cp);
1271 }
1272
1273 rc = sess_establish_session(sess_data);
1274out:
1275 sess_data->result = rc;
1276 sess_data->func = NULL;
1277 sess_free_buffer(sess_data);
1278 kfree(ses->auth_key.response);
1279 ses->auth_key.response = NULL;
1280}
1281
1282#ifdef CONFIG_CIFS_UPCALL
1283static void
1284sess_auth_kerberos(struct sess_data *sess_data)
1285{
1286 int rc = 0;
1287 struct smb_hdr *smb_buf;
1288 SESSION_SETUP_ANDX *pSMB;
1289 char *bcc_ptr;
1290 struct cifs_ses *ses = sess_data->ses;
1291 __u32 capabilities;
1292 __u16 bytes_remaining;
1293 struct key *spnego_key = NULL;
1294 struct cifs_spnego_msg *msg;
1295 u16 blob_len;
1296
1297
1298
1299 rc = sess_alloc_buffer(sess_data, 12);
1300 if (rc)
1301 goto out;
1302
1303 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1304 bcc_ptr = sess_data->iov[2].iov_base;
1305 capabilities = cifs_ssetup_hdr(ses, pSMB);
1306
1307 spnego_key = cifs_get_spnego_key(ses);
1308 if (IS_ERR(spnego_key)) {
1309 rc = PTR_ERR(spnego_key);
1310 spnego_key = NULL;
1311 goto out;
1312 }
1313
1314 msg = spnego_key->payload.data[0];
1315
1316
1317
1318
1319 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1320 cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n",
1321 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1322 rc = -EKEYREJECTED;
1323 goto out_put_spnego_key;
1324 }
1325
1326 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1327 GFP_KERNEL);
1328 if (!ses->auth_key.response) {
1329 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1330 msg->sesskey_len);
1331 rc = -ENOMEM;
1332 goto out_put_spnego_key;
1333 }
1334 ses->auth_key.len = msg->sesskey_len;
1335
1336 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1337 capabilities |= CAP_EXTENDED_SECURITY;
1338 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1339 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1340 sess_data->iov[1].iov_len = msg->secblob_len;
1341 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1342
1343 if (ses->capabilities & CAP_UNICODE) {
1344
1345 if ((sess_data->iov[0].iov_len
1346 + sess_data->iov[1].iov_len) % 2) {
1347 *bcc_ptr = 0;
1348 bcc_ptr++;
1349 }
1350 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1351 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1352 } else {
1353
1354 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1355 }
1356
1357 sess_data->iov[2].iov_len = (long) bcc_ptr -
1358 (long) sess_data->iov[2].iov_base;
1359
1360 rc = sess_sendreceive(sess_data);
1361 if (rc)
1362 goto out_put_spnego_key;
1363
1364 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1365 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1366
1367 if (smb_buf->WordCount != 4) {
1368 rc = -EIO;
1369 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1370 goto out_put_spnego_key;
1371 }
1372
1373 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1374 cifs_dbg(FYI, "Guest login\n");
1375
1376 ses->Suid = smb_buf->Uid;
1377 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1378
1379 bytes_remaining = get_bcc(smb_buf);
1380 bcc_ptr = pByteArea(smb_buf);
1381
1382 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1383 if (blob_len > bytes_remaining) {
1384 cifs_dbg(VFS, "bad security blob length %d\n",
1385 blob_len);
1386 rc = -EINVAL;
1387 goto out_put_spnego_key;
1388 }
1389 bcc_ptr += blob_len;
1390 bytes_remaining -= blob_len;
1391
1392
1393 if (bytes_remaining == 0) {
1394
1395 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1396
1397 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1398 ++bcc_ptr;
1399 --bytes_remaining;
1400 }
1401 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1402 sess_data->nls_cp);
1403 } else {
1404 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1405 sess_data->nls_cp);
1406 }
1407
1408 rc = sess_establish_session(sess_data);
1409out_put_spnego_key:
1410 key_invalidate(spnego_key);
1411 key_put(spnego_key);
1412out:
1413 sess_data->result = rc;
1414 sess_data->func = NULL;
1415 sess_free_buffer(sess_data);
1416 kfree(ses->auth_key.response);
1417 ses->auth_key.response = NULL;
1418}
1419
1420#endif
1421
1422
1423
1424
1425
1426static int
1427_sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1428{
1429 SESSION_SETUP_ANDX *pSMB;
1430 struct cifs_ses *ses = sess_data->ses;
1431 __u32 capabilities;
1432 char *bcc_ptr;
1433
1434 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1435
1436 capabilities = cifs_ssetup_hdr(ses, pSMB);
1437 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1438 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1439 return -ENOSYS;
1440 }
1441
1442 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1443 capabilities |= CAP_EXTENDED_SECURITY;
1444 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1445
1446 bcc_ptr = sess_data->iov[2].iov_base;
1447
1448 if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1449 *bcc_ptr = 0;
1450 bcc_ptr++;
1451 }
1452 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1453
1454 sess_data->iov[2].iov_len = (long) bcc_ptr -
1455 (long) sess_data->iov[2].iov_base;
1456
1457 return 0;
1458}
1459
1460static void
1461sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1462
1463static void
1464sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1465{
1466 int rc;
1467 struct smb_hdr *smb_buf;
1468 SESSION_SETUP_ANDX *pSMB;
1469 struct cifs_ses *ses = sess_data->ses;
1470 __u16 bytes_remaining;
1471 char *bcc_ptr;
1472 u16 blob_len;
1473
1474 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1475
1476
1477
1478
1479
1480 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1481 if (!ses->ntlmssp) {
1482 rc = -ENOMEM;
1483 goto out;
1484 }
1485 ses->ntlmssp->sesskey_per_smbsess = false;
1486
1487
1488 rc = sess_alloc_buffer(sess_data, 12);
1489 if (rc)
1490 goto out;
1491
1492 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1493
1494
1495 build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
1496 sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
1497 sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
1498 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
1499
1500 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1501 if (rc)
1502 goto out;
1503
1504 rc = sess_sendreceive(sess_data);
1505
1506 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1507 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1508
1509
1510 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1511 smb_buf->Status.CifsError ==
1512 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1513 rc = 0;
1514
1515 if (rc)
1516 goto out;
1517
1518 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1519
1520 if (smb_buf->WordCount != 4) {
1521 rc = -EIO;
1522 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1523 goto out;
1524 }
1525
1526 ses->Suid = smb_buf->Uid;
1527 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1528
1529 bytes_remaining = get_bcc(smb_buf);
1530 bcc_ptr = pByteArea(smb_buf);
1531
1532 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1533 if (blob_len > bytes_remaining) {
1534 cifs_dbg(VFS, "bad security blob length %d\n",
1535 blob_len);
1536 rc = -EINVAL;
1537 goto out;
1538 }
1539
1540 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1541out:
1542 sess_free_buffer(sess_data);
1543
1544 if (!rc) {
1545 sess_data->func = sess_auth_rawntlmssp_authenticate;
1546 return;
1547 }
1548
1549
1550 kfree(ses->auth_key.response);
1551 ses->auth_key.response = NULL;
1552 kfree(ses->ntlmssp);
1553 ses->ntlmssp = NULL;
1554
1555 sess_data->func = NULL;
1556 sess_data->result = rc;
1557}
1558
1559static void
1560sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1561{
1562 int rc;
1563 struct smb_hdr *smb_buf;
1564 SESSION_SETUP_ANDX *pSMB;
1565 struct cifs_ses *ses = sess_data->ses;
1566 __u16 bytes_remaining;
1567 char *bcc_ptr;
1568 unsigned char *ntlmsspblob = NULL;
1569 u16 blob_len;
1570
1571 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1572
1573
1574 rc = sess_alloc_buffer(sess_data, 12);
1575 if (rc)
1576 goto out;
1577
1578
1579 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1580 smb_buf = (struct smb_hdr *)pSMB;
1581 rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1582 &blob_len, ses, sess_data->nls_cp);
1583 if (rc)
1584 goto out_free_ntlmsspblob;
1585 sess_data->iov[1].iov_len = blob_len;
1586 sess_data->iov[1].iov_base = ntlmsspblob;
1587 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1588
1589
1590
1591
1592
1593 smb_buf->Uid = ses->Suid;
1594
1595 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1596 if (rc)
1597 goto out_free_ntlmsspblob;
1598
1599 rc = sess_sendreceive(sess_data);
1600 if (rc)
1601 goto out_free_ntlmsspblob;
1602
1603 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1604 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1605 if (smb_buf->WordCount != 4) {
1606 rc = -EIO;
1607 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1608 goto out_free_ntlmsspblob;
1609 }
1610
1611 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1612 cifs_dbg(FYI, "Guest login\n");
1613
1614 if (ses->Suid != smb_buf->Uid) {
1615 ses->Suid = smb_buf->Uid;
1616 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1617 }
1618
1619 bytes_remaining = get_bcc(smb_buf);
1620 bcc_ptr = pByteArea(smb_buf);
1621 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1622 if (blob_len > bytes_remaining) {
1623 cifs_dbg(VFS, "bad security blob length %d\n",
1624 blob_len);
1625 rc = -EINVAL;
1626 goto out_free_ntlmsspblob;
1627 }
1628 bcc_ptr += blob_len;
1629 bytes_remaining -= blob_len;
1630
1631
1632
1633 if (bytes_remaining == 0) {
1634
1635 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1636
1637 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1638 ++bcc_ptr;
1639 --bytes_remaining;
1640 }
1641 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1642 sess_data->nls_cp);
1643 } else {
1644 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1645 sess_data->nls_cp);
1646 }
1647
1648out_free_ntlmsspblob:
1649 kfree(ntlmsspblob);
1650out:
1651 sess_free_buffer(sess_data);
1652
1653 if (!rc)
1654 rc = sess_establish_session(sess_data);
1655
1656
1657 kfree(ses->auth_key.response);
1658 ses->auth_key.response = NULL;
1659 kfree(ses->ntlmssp);
1660 ses->ntlmssp = NULL;
1661
1662 sess_data->func = NULL;
1663 sess_data->result = rc;
1664}
1665
1666static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
1667{
1668 int type;
1669
1670 type = cifs_select_sectype(ses->server, ses->sectype);
1671 cifs_dbg(FYI, "sess setup type %d\n", type);
1672 if (type == Unspecified) {
1673 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1674 return -EINVAL;
1675 }
1676
1677 switch (type) {
1678 case LANMAN:
1679
1680
1681
1682
1683
1684#ifdef CONFIG_CIFS_WEAK_PW_HASH
1685 sess_data->func = sess_auth_lanman;
1686 break;
1687#else
1688 return -EOPNOTSUPP;
1689#endif
1690 case NTLM:
1691 sess_data->func = sess_auth_ntlm;
1692 break;
1693 case NTLMv2:
1694 sess_data->func = sess_auth_ntlmv2;
1695 break;
1696 case Kerberos:
1697#ifdef CONFIG_CIFS_UPCALL
1698 sess_data->func = sess_auth_kerberos;
1699 break;
1700#else
1701 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1702 return -ENOSYS;
1703#endif
1704 case RawNTLMSSP:
1705 sess_data->func = sess_auth_rawntlmssp_negotiate;
1706 break;
1707 default:
1708 cifs_dbg(VFS, "secType %d not supported!\n", type);
1709 return -ENOSYS;
1710 }
1711
1712 return 0;
1713}
1714
1715int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1716 const struct nls_table *nls_cp)
1717{
1718 int rc = 0;
1719 struct sess_data *sess_data;
1720
1721 if (ses == NULL) {
1722 WARN(1, "%s: ses == NULL!", __func__);
1723 return -EINVAL;
1724 }
1725
1726 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1727 if (!sess_data)
1728 return -ENOMEM;
1729
1730 rc = select_sec(ses, sess_data);
1731 if (rc)
1732 goto out;
1733
1734 sess_data->xid = xid;
1735 sess_data->ses = ses;
1736 sess_data->buf0_type = CIFS_NO_BUFFER;
1737 sess_data->nls_cp = (struct nls_table *) nls_cp;
1738
1739 while (sess_data->func)
1740 sess_data->func(sess_data);
1741
1742
1743 rc = sess_data->result;
1744
1745out:
1746 kfree(sess_data);
1747 return rc;
1748}
1749