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1/*
2 * fs/cifs/sess.c
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 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24#include "cifspdu.h"
25#include "cifsglob.h"
26#include "cifsproto.h"
27#include "cifs_unicode.h"
28#include "cifs_debug.h"
29#include "ntlmssp.h"
30#include "nterr.h"
31#include <linux/utsname.h>
32#include <linux/slab.h>
33#include "cifs_spnego.h"
34
35/*
36 * Checks if this is the first smb session to be reconnected after
37 * the socket has been reestablished (so we know whether to use vc 0).
38 * Called while holding the cifs_tcp_ses_lock, so do not block
39 */
40static bool is_first_ses_reconnect(struct cifs_ses *ses)
41{
42 struct list_head *tmp;
43 struct cifs_ses *tmp_ses;
44
45 list_for_each(tmp, &ses->server->smb_ses_list) {
46 tmp_ses = list_entry(tmp, struct cifs_ses,
47 smb_ses_list);
48 if (tmp_ses->need_reconnect == false)
49 return false;
50 }
51 /* could not find a session that was already connected,
52 this must be the first one we are reconnecting */
53 return true;
54}
55
56/*
57 * vc number 0 is treated specially by some servers, and should be the
58 * first one we request. After that we can use vcnumbers up to maxvcs,
59 * one for each smb session (some Windows versions set maxvcs incorrectly
60 * so maxvc=1 can be ignored). If we have too many vcs, we can reuse
61 * any vc but zero (some servers reset the connection on vcnum zero)
62 *
63 */
64static __le16 get_next_vcnum(struct cifs_ses *ses)
65{
66 __u16 vcnum = 0;
67 struct list_head *tmp;
68 struct cifs_ses *tmp_ses;
69 __u16 max_vcs = ses->server->max_vcs;
70 __u16 i;
71 int free_vc_found = 0;
72
73 /* Quoting the MS-SMB specification: "Windows-based SMB servers set this
74 field to one but do not enforce this limit, which allows an SMB client
75 to establish more virtual circuits than allowed by this value ... but
76 other server implementations can enforce this limit." */
77 if (max_vcs < 2)
78 max_vcs = 0xFFFF;
79
80 spin_lock(&cifs_tcp_ses_lock);
81 if ((ses->need_reconnect) && is_first_ses_reconnect(ses))
82 goto get_vc_num_exit; /* vcnum will be zero */
83 for (i = ses->server->srv_count - 1; i < max_vcs; i++) {
84 if (i == 0) /* this is the only connection, use vc 0 */
85 break;
86
87 free_vc_found = 1;
88
89 list_for_each(tmp, &ses->server->smb_ses_list) {
90 tmp_ses = list_entry(tmp, struct cifs_ses,
91 smb_ses_list);
92 if (tmp_ses->vcnum == i) {
93 free_vc_found = 0;
94 break; /* found duplicate, try next vcnum */
95 }
96 }
97 if (free_vc_found)
98 break; /* we found a vcnumber that will work - use it */
99 }
100
101 if (i == 0)
102 vcnum = 0; /* for most common case, ie if one smb session, use
103 vc zero. Also for case when no free vcnum, zero
104 is safest to send (some clients only send zero) */
105 else if (free_vc_found == 0)
106 vcnum = 1; /* we can not reuse vc=0 safely, since some servers
107 reset all uids on that, but 1 is ok. */
108 else
109 vcnum = i;
110 ses->vcnum = vcnum;
111get_vc_num_exit:
112 spin_unlock(&cifs_tcp_ses_lock);
113
114 return cpu_to_le16(vcnum);
115}
116
117static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB)
118{
119 __u32 capabilities = 0;
120
121 /* init fields common to all four types of SessSetup */
122 /* Note that offsets for first seven fields in req struct are same */
123 /* in CIFS Specs so does not matter which of 3 forms of struct */
124 /* that we use in next few lines */
125 /* Note that header is initialized to zero in header_assemble */
126 pSMB->req.AndXCommand = 0xFF;
127 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
128 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
129 USHRT_MAX));
130 pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
131 pSMB->req.VcNumber = get_next_vcnum(ses);
132
133 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
134
135 /* BB verify whether signing required on neg or just on auth frame
136 (and NTLM case) */
137
138 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
139 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
140
141 if (ses->server->sec_mode &
142 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
143 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
144
145 if (ses->capabilities & CAP_UNICODE) {
146 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
147 capabilities |= CAP_UNICODE;
148 }
149 if (ses->capabilities & CAP_STATUS32) {
150 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
151 capabilities |= CAP_STATUS32;
152 }
153 if (ses->capabilities & CAP_DFS) {
154 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
155 capabilities |= CAP_DFS;
156 }
157 if (ses->capabilities & CAP_UNIX)
158 capabilities |= CAP_UNIX;
159
160 return capabilities;
161}
162
163static void
164unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
165{
166 char *bcc_ptr = *pbcc_area;
167 int bytes_ret = 0;
168
169 /* Copy OS version */
170 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
171 nls_cp);
172 bcc_ptr += 2 * bytes_ret;
173 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
174 32, nls_cp);
175 bcc_ptr += 2 * bytes_ret;
176 bcc_ptr += 2; /* trailing null */
177
178 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
179 32, nls_cp);
180 bcc_ptr += 2 * bytes_ret;
181 bcc_ptr += 2; /* trailing null */
182
183 *pbcc_area = bcc_ptr;
184}
185
186static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
187 const struct nls_table *nls_cp)
188{
189 char *bcc_ptr = *pbcc_area;
190 int bytes_ret = 0;
191
192 /* copy domain */
193 if (ses->domainName == NULL) {
194 /* Sending null domain better than using a bogus domain name (as
195 we did briefly in 2.6.18) since server will use its default */
196 *bcc_ptr = 0;
197 *(bcc_ptr+1) = 0;
198 bytes_ret = 0;
199 } else
200 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
201 256, nls_cp);
202 bcc_ptr += 2 * bytes_ret;
203 bcc_ptr += 2; /* account for null terminator */
204
205 *pbcc_area = bcc_ptr;
206}
207
208
209static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
210 const struct nls_table *nls_cp)
211{
212 char *bcc_ptr = *pbcc_area;
213 int bytes_ret = 0;
214
215 /* BB FIXME add check that strings total less
216 than 335 or will need to send them as arrays */
217
218 /* unicode strings, must be word aligned before the call */
219/* if ((long) bcc_ptr % 2) {
220 *bcc_ptr = 0;
221 bcc_ptr++;
222 } */
223 /* copy user */
224 if (ses->user_name == NULL) {
225 /* null user mount */
226 *bcc_ptr = 0;
227 *(bcc_ptr+1) = 0;
228 } else {
229 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
230 MAX_USERNAME_SIZE, nls_cp);
231 }
232 bcc_ptr += 2 * bytes_ret;
233 bcc_ptr += 2; /* account for null termination */
234
235 unicode_domain_string(&bcc_ptr, ses, nls_cp);
236 unicode_oslm_strings(&bcc_ptr, nls_cp);
237
238 *pbcc_area = bcc_ptr;
239}
240
241static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
242 const struct nls_table *nls_cp)
243{
244 char *bcc_ptr = *pbcc_area;
245
246 /* copy user */
247 /* BB what about null user mounts - check that we do this BB */
248 /* copy user */
249 if (ses->user_name != NULL) {
250 strncpy(bcc_ptr, ses->user_name, MAX_USERNAME_SIZE);
251 bcc_ptr += strnlen(ses->user_name, MAX_USERNAME_SIZE);
252 }
253 /* else null user mount */
254 *bcc_ptr = 0;
255 bcc_ptr++; /* account for null termination */
256
257 /* copy domain */
258 if (ses->domainName != NULL) {
259 strncpy(bcc_ptr, ses->domainName, 256);
260 bcc_ptr += strnlen(ses->domainName, 256);
261 } /* else we will send a null domain name
262 so the server will default to its own domain */
263 *bcc_ptr = 0;
264 bcc_ptr++;
265
266 /* BB check for overflow here */
267
268 strcpy(bcc_ptr, "Linux version ");
269 bcc_ptr += strlen("Linux version ");
270 strcpy(bcc_ptr, init_utsname()->release);
271 bcc_ptr += strlen(init_utsname()->release) + 1;
272
273 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
274 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
275
276 *pbcc_area = bcc_ptr;
277}
278
279static void
280decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
281 const struct nls_table *nls_cp)
282{
283 int len;
284 char *data = *pbcc_area;
285
286 cFYI(1, "bleft %d", bleft);
287
288 kfree(ses->serverOS);
289 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
290 cFYI(1, "serverOS=%s", ses->serverOS);
291 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
292 data += len;
293 bleft -= len;
294 if (bleft <= 0)
295 return;
296
297 kfree(ses->serverNOS);
298 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
299 cFYI(1, "serverNOS=%s", ses->serverNOS);
300 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
301 data += len;
302 bleft -= len;
303 if (bleft <= 0)
304 return;
305
306 kfree(ses->serverDomain);
307 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
308 cFYI(1, "serverDomain=%s", ses->serverDomain);
309
310 return;
311}
312
313static int decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
314 struct cifs_ses *ses,
315 const struct nls_table *nls_cp)
316{
317 int rc = 0;
318 int len;
319 char *bcc_ptr = *pbcc_area;
320
321 cFYI(1, "decode sessetup ascii. bleft %d", bleft);
322
323 len = strnlen(bcc_ptr, bleft);
324 if (len >= bleft)
325 return rc;
326
327 kfree(ses->serverOS);
328
329 ses->serverOS = kzalloc(len + 1, GFP_KERNEL);
330 if (ses->serverOS)
331 strncpy(ses->serverOS, bcc_ptr, len);
332 if (strncmp(ses->serverOS, "OS/2", 4) == 0) {
333 cFYI(1, "OS/2 server");
334 ses->flags |= CIFS_SES_OS2;
335 }
336
337 bcc_ptr += len + 1;
338 bleft -= len + 1;
339
340 len = strnlen(bcc_ptr, bleft);
341 if (len >= bleft)
342 return rc;
343
344 kfree(ses->serverNOS);
345
346 ses->serverNOS = kzalloc(len + 1, GFP_KERNEL);
347 if (ses->serverNOS)
348 strncpy(ses->serverNOS, bcc_ptr, len);
349
350 bcc_ptr += len + 1;
351 bleft -= len + 1;
352
353 len = strnlen(bcc_ptr, bleft);
354 if (len > bleft)
355 return rc;
356
357 /* No domain field in LANMAN case. Domain is
358 returned by old servers in the SMB negprot response */
359 /* BB For newer servers which do not support Unicode,
360 but thus do return domain here we could add parsing
361 for it later, but it is not very important */
362 cFYI(1, "ascii: bytes left %d", bleft);
363
364 return rc;
365}
366
367static int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
368 struct cifs_ses *ses)
369{
370 unsigned int tioffset; /* challenge message target info area */
371 unsigned int tilen; /* challenge message target info area length */
372
373 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
374
375 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
376 cERROR(1, "challenge blob len %d too small", blob_len);
377 return -EINVAL;
378 }
379
380 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
381 cERROR(1, "blob signature incorrect %s", pblob->Signature);
382 return -EINVAL;
383 }
384 if (pblob->MessageType != NtLmChallenge) {
385 cERROR(1, "Incorrect message type %d", pblob->MessageType);
386 return -EINVAL;
387 }
388
389 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
390 /* BB we could decode pblob->NegotiateFlags; some may be useful */
391 /* In particular we can examine sign flags */
392 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
393 we must set the MIC field of the AUTHENTICATE_MESSAGE */
394 ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags);
395 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
396 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
397 if (tioffset > blob_len || tioffset + tilen > blob_len) {
398 cERROR(1, "tioffset + tilen too high %u + %u", tioffset, tilen);
399 return -EINVAL;
400 }
401 if (tilen) {
402 ses->auth_key.response = kmalloc(tilen, GFP_KERNEL);
403 if (!ses->auth_key.response) {
404 cERROR(1, "Challenge target info allocation failure");
405 return -ENOMEM;
406 }
407 memcpy(ses->auth_key.response, bcc_ptr + tioffset, tilen);
408 ses->auth_key.len = tilen;
409 }
410
411 return 0;
412}
413
414/* BB Move to ntlmssp.c eventually */
415
416/* We do not malloc the blob, it is passed in pbuffer, because
417 it is fixed size, and small, making this approach cleaner */
418static void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
419 struct cifs_ses *ses)
420{
421 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer;
422 __u32 flags;
423
424 memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
425 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
426 sec_blob->MessageType = NtLmNegotiate;
427
428 /* BB is NTLMV2 session security format easier to use here? */
429 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
430 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
431 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
432 if (ses->server->sec_mode &
433 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
434 flags |= NTLMSSP_NEGOTIATE_SIGN;
435 if (!ses->server->session_estab)
436 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
437 }
438
439 sec_blob->NegotiateFlags = cpu_to_le32(flags);
440
441 sec_blob->WorkstationName.BufferOffset = 0;
442 sec_blob->WorkstationName.Length = 0;
443 sec_blob->WorkstationName.MaximumLength = 0;
444
445 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
446 sec_blob->DomainName.BufferOffset = 0;
447 sec_blob->DomainName.Length = 0;
448 sec_blob->DomainName.MaximumLength = 0;
449}
450
451/* We do not malloc the blob, it is passed in pbuffer, because its
452 maximum possible size is fixed and small, making this approach cleaner.
453 This function returns the length of the data in the blob */
454static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
455 u16 *buflen,
456 struct cifs_ses *ses,
457 const struct nls_table *nls_cp)
458{
459 int rc;
460 AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer;
461 __u32 flags;
462 unsigned char *tmp;
463
464 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
465 sec_blob->MessageType = NtLmAuthenticate;
466
467 flags = NTLMSSP_NEGOTIATE_56 |
468 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
469 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
470 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
471 if (ses->server->sec_mode &
472 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
473 flags |= NTLMSSP_NEGOTIATE_SIGN;
474 if (!ses->server->session_estab)
475 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
476 }
477
478 tmp = pbuffer + sizeof(AUTHENTICATE_MESSAGE);
479 sec_blob->NegotiateFlags = cpu_to_le32(flags);
480
481 sec_blob->LmChallengeResponse.BufferOffset =
482 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
483 sec_blob->LmChallengeResponse.Length = 0;
484 sec_blob->LmChallengeResponse.MaximumLength = 0;
485
486 sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer);
487 rc = setup_ntlmv2_rsp(ses, nls_cp);
488 if (rc) {
489 cERROR(1, "Error %d during NTLMSSP authentication", rc);
490 goto setup_ntlmv2_ret;
491 }
492 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
493 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
494 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
495
496 sec_blob->NtChallengeResponse.Length =
497 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
498 sec_blob->NtChallengeResponse.MaximumLength =
499 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
500
501 if (ses->domainName == NULL) {
502 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
503 sec_blob->DomainName.Length = 0;
504 sec_blob->DomainName.MaximumLength = 0;
505 tmp += 2;
506 } else {
507 int len;
508 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
509 MAX_USERNAME_SIZE, nls_cp);
510 len *= 2; /* unicode is 2 bytes each */
511 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
512 sec_blob->DomainName.Length = cpu_to_le16(len);
513 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
514 tmp += len;
515 }
516
517 if (ses->user_name == NULL) {
518 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
519 sec_blob->UserName.Length = 0;
520 sec_blob->UserName.MaximumLength = 0;
521 tmp += 2;
522 } else {
523 int len;
524 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
525 MAX_USERNAME_SIZE, nls_cp);
526 len *= 2; /* unicode is 2 bytes each */
527 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
528 sec_blob->UserName.Length = cpu_to_le16(len);
529 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
530 tmp += len;
531 }
532
533 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - pbuffer);
534 sec_blob->WorkstationName.Length = 0;
535 sec_blob->WorkstationName.MaximumLength = 0;
536 tmp += 2;
537
538 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
539 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
540 && !calc_seckey(ses)) {
541 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
542 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
543 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
544 sec_blob->SessionKey.MaximumLength =
545 cpu_to_le16(CIFS_CPHTXT_SIZE);
546 tmp += CIFS_CPHTXT_SIZE;
547 } else {
548 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
549 sec_blob->SessionKey.Length = 0;
550 sec_blob->SessionKey.MaximumLength = 0;
551 }
552
553setup_ntlmv2_ret:
554 *buflen = tmp - pbuffer;
555 return rc;
556}
557
558int
559CIFS_SessSetup(unsigned int xid, struct cifs_ses *ses,
560 const struct nls_table *nls_cp)
561{
562 int rc = 0;
563 int wct;
564 struct smb_hdr *smb_buf;
565 char *bcc_ptr;
566 char *str_area;
567 SESSION_SETUP_ANDX *pSMB;
568 __u32 capabilities;
569 __u16 count;
570 int resp_buf_type;
571 struct kvec iov[3];
572 enum securityEnum type;
573 __u16 action, bytes_remaining;
574 struct key *spnego_key = NULL;
575 __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
576 u16 blob_len;
577 char *ntlmsspblob = NULL;
578
579 if (ses == NULL)
580 return -EINVAL;
581
582 type = ses->server->secType;
583 cFYI(1, "sess setup type %d", type);
584 if (type == RawNTLMSSP) {
585 /* if memory allocation is successful, caller of this function
586 * frees it.
587 */
588 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
589 if (!ses->ntlmssp)
590 return -ENOMEM;
591 }
592
593ssetup_ntlmssp_authenticate:
594 if (phase == NtLmChallenge)
595 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
596
597 if (type == LANMAN) {
598#ifndef CONFIG_CIFS_WEAK_PW_HASH
599 /* LANMAN and plaintext are less secure and off by default.
600 So we make this explicitly be turned on in kconfig (in the
601 build) and turned on at runtime (changed from the default)
602 in proc/fs/cifs or via mount parm. Unfortunately this is
603 needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
604 return -EOPNOTSUPP;
605#endif
606 wct = 10; /* lanman 2 style sessionsetup */
607 } else if ((type == NTLM) || (type == NTLMv2)) {
608 /* For NTLMv2 failures eventually may need to retry NTLM */
609 wct = 13; /* old style NTLM sessionsetup */
610 } else /* same size: negotiate or auth, NTLMSSP or extended security */
611 wct = 12;
612
613 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
614 (void **)&smb_buf);
615 if (rc)
616 return rc;
617
618 pSMB = (SESSION_SETUP_ANDX *)smb_buf;
619
620 capabilities = cifs_ssetup_hdr(ses, pSMB);
621
622 /* we will send the SMB in three pieces:
623 a fixed length beginning part, an optional
624 SPNEGO blob (which can be zero length), and a
625 last part which will include the strings
626 and rest of bcc area. This allows us to avoid
627 a large buffer 17K allocation */
628 iov[0].iov_base = (char *)pSMB;
629 iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
630
631 /* setting this here allows the code at the end of the function
632 to free the request buffer if there's an error */
633 resp_buf_type = CIFS_SMALL_BUFFER;
634
635 /* 2000 big enough to fit max user, domain, NOS name etc. */
636 str_area = kmalloc(2000, GFP_KERNEL);
637 if (str_area == NULL) {
638 rc = -ENOMEM;
639 goto ssetup_exit;
640 }
641 bcc_ptr = str_area;
642
643 ses->flags &= ~CIFS_SES_LANMAN;
644
645 iov[1].iov_base = NULL;
646 iov[1].iov_len = 0;
647
648 if (type == LANMAN) {
649#ifdef CONFIG_CIFS_WEAK_PW_HASH
650 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
651
652 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
653
654 /* no capabilities flags in old lanman negotiation */
655
656 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
657
658 /* Calculate hash with password and copy into bcc_ptr.
659 * Encryption Key (stored as in cryptkey) gets used if the
660 * security mode bit in Negottiate Protocol response states
661 * to use challenge/response method (i.e. Password bit is 1).
662 */
663
664 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
665 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
666 true : false, lnm_session_key);
667
668 ses->flags |= CIFS_SES_LANMAN;
669 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
670 bcc_ptr += CIFS_AUTH_RESP_SIZE;
671
672 /* can not sign if LANMAN negotiated so no need
673 to calculate signing key? but what if server
674 changed to do higher than lanman dialect and
675 we reconnected would we ever calc signing_key? */
676
677 cFYI(1, "Negotiating LANMAN setting up strings");
678 /* Unicode not allowed for LANMAN dialects */
679 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
680#endif
681 } else if (type == NTLM) {
682 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
683 pSMB->req_no_secext.CaseInsensitivePasswordLength =
684 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
685 pSMB->req_no_secext.CaseSensitivePasswordLength =
686 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
687
688 /* calculate ntlm response and session key */
689 rc = setup_ntlm_response(ses, nls_cp);
690 if (rc) {
691 cERROR(1, "Error %d during NTLM authentication", rc);
692 goto ssetup_exit;
693 }
694
695 /* copy ntlm response */
696 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
697 CIFS_AUTH_RESP_SIZE);
698 bcc_ptr += CIFS_AUTH_RESP_SIZE;
699 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
700 CIFS_AUTH_RESP_SIZE);
701 bcc_ptr += CIFS_AUTH_RESP_SIZE;
702
703 if (ses->capabilities & CAP_UNICODE) {
704 /* unicode strings must be word aligned */
705 if (iov[0].iov_len % 2) {
706 *bcc_ptr = 0;
707 bcc_ptr++;
708 }
709 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
710 } else
711 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
712 } else if (type == NTLMv2) {
713 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
714
715 /* LM2 password would be here if we supported it */
716 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
717
718 /* calculate nlmv2 response and session key */
719 rc = setup_ntlmv2_rsp(ses, nls_cp);
720 if (rc) {
721 cERROR(1, "Error %d during NTLMv2 authentication", rc);
722 goto ssetup_exit;
723 }
724 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
725 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
726 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
727
728 /* set case sensitive password length after tilen may get
729 * assigned, tilen is 0 otherwise.
730 */
731 pSMB->req_no_secext.CaseSensitivePasswordLength =
732 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
733
734 if (ses->capabilities & CAP_UNICODE) {
735 if (iov[0].iov_len % 2) {
736 *bcc_ptr = 0;
737 bcc_ptr++;
738 }
739 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
740 } else
741 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
742 } else if (type == Kerberos) {
743#ifdef CONFIG_CIFS_UPCALL
744 struct cifs_spnego_msg *msg;
745
746 spnego_key = cifs_get_spnego_key(ses);
747 if (IS_ERR(spnego_key)) {
748 rc = PTR_ERR(spnego_key);
749 spnego_key = NULL;
750 goto ssetup_exit;
751 }
752
753 msg = spnego_key->payload.data;
754 /* check version field to make sure that cifs.upcall is
755 sending us a response in an expected form */
756 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
757 cERROR(1, "incorrect version of cifs.upcall (expected"
758 " %d but got %d)",
759 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
760 rc = -EKEYREJECTED;
761 goto ssetup_exit;
762 }
763
764 ses->auth_key.response = kmalloc(msg->sesskey_len, GFP_KERNEL);
765 if (!ses->auth_key.response) {
766 cERROR(1, "Kerberos can't allocate (%u bytes) memory",
767 msg->sesskey_len);
768 rc = -ENOMEM;
769 goto ssetup_exit;
770 }
771 memcpy(ses->auth_key.response, msg->data, msg->sesskey_len);
772 ses->auth_key.len = msg->sesskey_len;
773
774 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
775 capabilities |= CAP_EXTENDED_SECURITY;
776 pSMB->req.Capabilities = cpu_to_le32(capabilities);
777 iov[1].iov_base = msg->data + msg->sesskey_len;
778 iov[1].iov_len = msg->secblob_len;
779 pSMB->req.SecurityBlobLength = cpu_to_le16(iov[1].iov_len);
780
781 if (ses->capabilities & CAP_UNICODE) {
782 /* unicode strings must be word aligned */
783 if ((iov[0].iov_len + iov[1].iov_len) % 2) {
784 *bcc_ptr = 0;
785 bcc_ptr++;
786 }
787 unicode_oslm_strings(&bcc_ptr, nls_cp);
788 unicode_domain_string(&bcc_ptr, ses, nls_cp);
789 } else
790 /* BB: is this right? */
791 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
792#else /* ! CONFIG_CIFS_UPCALL */
793 cERROR(1, "Kerberos negotiated but upcall support disabled!");
794 rc = -ENOSYS;
795 goto ssetup_exit;
796#endif /* CONFIG_CIFS_UPCALL */
797 } else if (type == RawNTLMSSP) {
798 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
799 cERROR(1, "NTLMSSP requires Unicode support");
800 rc = -ENOSYS;
801 goto ssetup_exit;
802 }
803
804 cFYI(1, "ntlmssp session setup phase %d", phase);
805 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
806 capabilities |= CAP_EXTENDED_SECURITY;
807 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
808 switch(phase) {
809 case NtLmNegotiate:
810 build_ntlmssp_negotiate_blob(
811 pSMB->req.SecurityBlob, ses);
812 iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
813 iov[1].iov_base = pSMB->req.SecurityBlob;
814 pSMB->req.SecurityBlobLength =
815 cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
816 break;
817 case NtLmAuthenticate:
818 /*
819 * 5 is an empirical value, large enough to hold
820 * authenticate message plus max 10 of av paris,
821 * domain, user, workstation names, flags, etc.
822 */
823 ntlmsspblob = kzalloc(
824 5*sizeof(struct _AUTHENTICATE_MESSAGE),
825 GFP_KERNEL);
826 if (!ntlmsspblob) {
827 cERROR(1, "Can't allocate NTLMSSP blob");
828 rc = -ENOMEM;
829 goto ssetup_exit;
830 }
831
832 rc = build_ntlmssp_auth_blob(ntlmsspblob,
833 &blob_len, ses, nls_cp);
834 if (rc)
835 goto ssetup_exit;
836 iov[1].iov_len = blob_len;
837 iov[1].iov_base = ntlmsspblob;
838 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
839 /*
840 * Make sure that we tell the server that we are using
841 * the uid that it just gave us back on the response
842 * (challenge)
843 */
844 smb_buf->Uid = ses->Suid;
845 break;
846 default:
847 cERROR(1, "invalid phase %d", phase);
848 rc = -ENOSYS;
849 goto ssetup_exit;
850 }
851 /* unicode strings must be word aligned */
852 if ((iov[0].iov_len + iov[1].iov_len) % 2) {
853 *bcc_ptr = 0;
854 bcc_ptr++;
855 }
856 unicode_oslm_strings(&bcc_ptr, nls_cp);
857 } else {
858 cERROR(1, "secType %d not supported!", type);
859 rc = -ENOSYS;
860 goto ssetup_exit;
861 }
862
863 iov[2].iov_base = str_area;
864 iov[2].iov_len = (long) bcc_ptr - (long) str_area;
865
866 count = iov[1].iov_len + iov[2].iov_len;
867 smb_buf->smb_buf_length =
868 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
869
870 put_bcc(count, smb_buf);
871
872 rc = SendReceive2(xid, ses, iov, 3 /* num_iovecs */, &resp_buf_type,
873 CIFS_LOG_ERROR);
874 /* SMB request buf freed in SendReceive2 */
875
876 pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base;
877 smb_buf = (struct smb_hdr *)iov[0].iov_base;
878
879 if ((type == RawNTLMSSP) && (smb_buf->Status.CifsError ==
880 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))) {
881 if (phase != NtLmNegotiate) {
882 cERROR(1, "Unexpected more processing error");
883 goto ssetup_exit;
884 }
885 /* NTLMSSP Negotiate sent now processing challenge (response) */
886 phase = NtLmChallenge; /* process ntlmssp challenge */
887 rc = 0; /* MORE_PROC rc is not an error here, but expected */
888 }
889 if (rc)
890 goto ssetup_exit;
891
892 if ((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) {
893 rc = -EIO;
894 cERROR(1, "bad word count %d", smb_buf->WordCount);
895 goto ssetup_exit;
896 }
897 action = le16_to_cpu(pSMB->resp.Action);
898 if (action & GUEST_LOGIN)
899 cFYI(1, "Guest login"); /* BB mark SesInfo struct? */
900 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
901 cFYI(1, "UID = %d ", ses->Suid);
902 /* response can have either 3 or 4 word count - Samba sends 3 */
903 /* and lanman response is 3 */
904 bytes_remaining = get_bcc(smb_buf);
905 bcc_ptr = pByteArea(smb_buf);
906
907 if (smb_buf->WordCount == 4) {
908 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
909 if (blob_len > bytes_remaining) {
910 cERROR(1, "bad security blob length %d", blob_len);
911 rc = -EINVAL;
912 goto ssetup_exit;
913 }
914 if (phase == NtLmChallenge) {
915 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
916 /* now goto beginning for ntlmssp authenticate phase */
917 if (rc)
918 goto ssetup_exit;
919 }
920 bcc_ptr += blob_len;
921 bytes_remaining -= blob_len;
922 }
923
924 /* BB check if Unicode and decode strings */
925 if (bytes_remaining == 0) {
926 /* no string area to decode, do nothing */
927 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
928 /* unicode string area must be word-aligned */
929 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
930 ++bcc_ptr;
931 --bytes_remaining;
932 }
933 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, nls_cp);
934 } else {
935 rc = decode_ascii_ssetup(&bcc_ptr, bytes_remaining,
936 ses, nls_cp);
937 }
938
939ssetup_exit:
940 if (spnego_key) {
941 key_revoke(spnego_key);
942 key_put(spnego_key);
943 }
944 kfree(str_area);
945 kfree(ntlmsspblob);
946 ntlmsspblob = NULL;
947 if (resp_buf_type == CIFS_SMALL_BUFFER) {
948 cFYI(1, "ssetup freeing small buf %p", iov[0].iov_base);
949 cifs_small_buf_release(iov[0].iov_base);
950 } else if (resp_buf_type == CIFS_LARGE_BUFFER)
951 cifs_buf_release(iov[0].iov_base);
952
953 /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
954 if ((phase == NtLmChallenge) && (rc == 0))
955 goto ssetup_ntlmssp_authenticate;
956
957 return rc;
958}
1/*
2 * fs/cifs/sess.c
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 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24#include "cifspdu.h"
25#include "cifsglob.h"
26#include "cifsproto.h"
27#include "cifs_unicode.h"
28#include "cifs_debug.h"
29#include "ntlmssp.h"
30#include "nterr.h"
31#include <linux/utsname.h>
32#include <linux/slab.h>
33#include "cifs_spnego.h"
34
35static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB)
36{
37 __u32 capabilities = 0;
38
39 /* init fields common to all four types of SessSetup */
40 /* Note that offsets for first seven fields in req struct are same */
41 /* in CIFS Specs so does not matter which of 3 forms of struct */
42 /* that we use in next few lines */
43 /* Note that header is initialized to zero in header_assemble */
44 pSMB->req.AndXCommand = 0xFF;
45 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
46 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
47 USHRT_MAX));
48 pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
49 pSMB->req.VcNumber = cpu_to_le16(1);
50
51 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
52
53 /* BB verify whether signing required on neg or just on auth frame
54 (and NTLM case) */
55
56 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
57 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
58
59 if (ses->server->sign)
60 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
61
62 if (ses->capabilities & CAP_UNICODE) {
63 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
64 capabilities |= CAP_UNICODE;
65 }
66 if (ses->capabilities & CAP_STATUS32) {
67 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
68 capabilities |= CAP_STATUS32;
69 }
70 if (ses->capabilities & CAP_DFS) {
71 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
72 capabilities |= CAP_DFS;
73 }
74 if (ses->capabilities & CAP_UNIX)
75 capabilities |= CAP_UNIX;
76
77 return capabilities;
78}
79
80static void
81unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
82{
83 char *bcc_ptr = *pbcc_area;
84 int bytes_ret = 0;
85
86 /* Copy OS version */
87 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
88 nls_cp);
89 bcc_ptr += 2 * bytes_ret;
90 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
91 32, nls_cp);
92 bcc_ptr += 2 * bytes_ret;
93 bcc_ptr += 2; /* trailing null */
94
95 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
96 32, nls_cp);
97 bcc_ptr += 2 * bytes_ret;
98 bcc_ptr += 2; /* trailing null */
99
100 *pbcc_area = bcc_ptr;
101}
102
103static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
104 const struct nls_table *nls_cp)
105{
106 char *bcc_ptr = *pbcc_area;
107 int bytes_ret = 0;
108
109 /* copy domain */
110 if (ses->domainName == NULL) {
111 /* Sending null domain better than using a bogus domain name (as
112 we did briefly in 2.6.18) since server will use its default */
113 *bcc_ptr = 0;
114 *(bcc_ptr+1) = 0;
115 bytes_ret = 0;
116 } else
117 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
118 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
119 bcc_ptr += 2 * bytes_ret;
120 bcc_ptr += 2; /* account for null terminator */
121
122 *pbcc_area = bcc_ptr;
123}
124
125
126static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
127 const struct nls_table *nls_cp)
128{
129 char *bcc_ptr = *pbcc_area;
130 int bytes_ret = 0;
131
132 /* BB FIXME add check that strings total less
133 than 335 or will need to send them as arrays */
134
135 /* unicode strings, must be word aligned before the call */
136/* if ((long) bcc_ptr % 2) {
137 *bcc_ptr = 0;
138 bcc_ptr++;
139 } */
140 /* copy user */
141 if (ses->user_name == NULL) {
142 /* null user mount */
143 *bcc_ptr = 0;
144 *(bcc_ptr+1) = 0;
145 } else {
146 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
147 CIFS_MAX_USERNAME_LEN, nls_cp);
148 }
149 bcc_ptr += 2 * bytes_ret;
150 bcc_ptr += 2; /* account for null termination */
151
152 unicode_domain_string(&bcc_ptr, ses, nls_cp);
153 unicode_oslm_strings(&bcc_ptr, nls_cp);
154
155 *pbcc_area = bcc_ptr;
156}
157
158static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
159 const struct nls_table *nls_cp)
160{
161 char *bcc_ptr = *pbcc_area;
162 int len;
163
164 /* copy user */
165 /* BB what about null user mounts - check that we do this BB */
166 /* copy user */
167 if (ses->user_name != NULL) {
168 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
169 if (WARN_ON_ONCE(len < 0))
170 len = CIFS_MAX_USERNAME_LEN - 1;
171 bcc_ptr += len;
172 }
173 /* else null user mount */
174 *bcc_ptr = 0;
175 bcc_ptr++; /* account for null termination */
176
177 /* copy domain */
178 if (ses->domainName != NULL) {
179 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
180 if (WARN_ON_ONCE(len < 0))
181 len = CIFS_MAX_DOMAINNAME_LEN - 1;
182 bcc_ptr += len;
183 } /* else we will send a null domain name
184 so the server will default to its own domain */
185 *bcc_ptr = 0;
186 bcc_ptr++;
187
188 /* BB check for overflow here */
189
190 strcpy(bcc_ptr, "Linux version ");
191 bcc_ptr += strlen("Linux version ");
192 strcpy(bcc_ptr, init_utsname()->release);
193 bcc_ptr += strlen(init_utsname()->release) + 1;
194
195 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
196 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
197
198 *pbcc_area = bcc_ptr;
199}
200
201static void
202decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
203 const struct nls_table *nls_cp)
204{
205 int len;
206 char *data = *pbcc_area;
207
208 cifs_dbg(FYI, "bleft %d\n", bleft);
209
210 kfree(ses->serverOS);
211 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
212 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
213 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
214 data += len;
215 bleft -= len;
216 if (bleft <= 0)
217 return;
218
219 kfree(ses->serverNOS);
220 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
221 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
222 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
223 data += len;
224 bleft -= len;
225 if (bleft <= 0)
226 return;
227
228 kfree(ses->serverDomain);
229 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
230 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
231
232 return;
233}
234
235static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
236 struct cifs_ses *ses,
237 const struct nls_table *nls_cp)
238{
239 int len;
240 char *bcc_ptr = *pbcc_area;
241
242 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
243
244 len = strnlen(bcc_ptr, bleft);
245 if (len >= bleft)
246 return;
247
248 kfree(ses->serverOS);
249
250 ses->serverOS = kmalloc(len + 1, GFP_KERNEL);
251 if (ses->serverOS) {
252 memcpy(ses->serverOS, bcc_ptr, len);
253 ses->serverOS[len] = 0;
254 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
255 cifs_dbg(FYI, "OS/2 server\n");
256 }
257
258 bcc_ptr += len + 1;
259 bleft -= len + 1;
260
261 len = strnlen(bcc_ptr, bleft);
262 if (len >= bleft)
263 return;
264
265 kfree(ses->serverNOS);
266
267 ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);
268 if (ses->serverNOS) {
269 memcpy(ses->serverNOS, bcc_ptr, len);
270 ses->serverNOS[len] = 0;
271 }
272
273 bcc_ptr += len + 1;
274 bleft -= len + 1;
275
276 len = strnlen(bcc_ptr, bleft);
277 if (len > bleft)
278 return;
279
280 /* No domain field in LANMAN case. Domain is
281 returned by old servers in the SMB negprot response */
282 /* BB For newer servers which do not support Unicode,
283 but thus do return domain here we could add parsing
284 for it later, but it is not very important */
285 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
286}
287
288int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
289 struct cifs_ses *ses)
290{
291 unsigned int tioffset; /* challenge message target info area */
292 unsigned int tilen; /* challenge message target info area length */
293
294 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
295
296 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
297 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
298 return -EINVAL;
299 }
300
301 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
302 cifs_dbg(VFS, "blob signature incorrect %s\n",
303 pblob->Signature);
304 return -EINVAL;
305 }
306 if (pblob->MessageType != NtLmChallenge) {
307 cifs_dbg(VFS, "Incorrect message type %d\n",
308 pblob->MessageType);
309 return -EINVAL;
310 }
311
312 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
313 /* BB we could decode pblob->NegotiateFlags; some may be useful */
314 /* In particular we can examine sign flags */
315 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
316 we must set the MIC field of the AUTHENTICATE_MESSAGE */
317 ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags);
318 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
319 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
320 if (tioffset > blob_len || tioffset + tilen > blob_len) {
321 cifs_dbg(VFS, "tioffset + tilen too high %u + %u",
322 tioffset, tilen);
323 return -EINVAL;
324 }
325 if (tilen) {
326 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
327 GFP_KERNEL);
328 if (!ses->auth_key.response) {
329 cifs_dbg(VFS, "Challenge target info alloc failure");
330 return -ENOMEM;
331 }
332 ses->auth_key.len = tilen;
333 }
334
335 return 0;
336}
337
338/* BB Move to ntlmssp.c eventually */
339
340/* We do not malloc the blob, it is passed in pbuffer, because
341 it is fixed size, and small, making this approach cleaner */
342void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
343 struct cifs_ses *ses)
344{
345 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer;
346 __u32 flags;
347
348 memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
349 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
350 sec_blob->MessageType = NtLmNegotiate;
351
352 /* BB is NTLMV2 session security format easier to use here? */
353 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
354 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
355 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
356 NTLMSSP_NEGOTIATE_SEAL;
357 if (ses->server->sign)
358 flags |= NTLMSSP_NEGOTIATE_SIGN;
359 if (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
360 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
361
362 sec_blob->NegotiateFlags = cpu_to_le32(flags);
363
364 sec_blob->WorkstationName.BufferOffset = 0;
365 sec_blob->WorkstationName.Length = 0;
366 sec_blob->WorkstationName.MaximumLength = 0;
367
368 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
369 sec_blob->DomainName.BufferOffset = 0;
370 sec_blob->DomainName.Length = 0;
371 sec_blob->DomainName.MaximumLength = 0;
372}
373
374static int size_of_ntlmssp_blob(struct cifs_ses *ses)
375{
376 int sz = sizeof(AUTHENTICATE_MESSAGE) + ses->auth_key.len
377 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
378
379 if (ses->domainName)
380 sz += 2 * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
381 else
382 sz += 2;
383
384 if (ses->user_name)
385 sz += 2 * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
386 else
387 sz += 2;
388
389 return sz;
390}
391
392int build_ntlmssp_auth_blob(unsigned char **pbuffer,
393 u16 *buflen,
394 struct cifs_ses *ses,
395 const struct nls_table *nls_cp)
396{
397 int rc;
398 AUTHENTICATE_MESSAGE *sec_blob;
399 __u32 flags;
400 unsigned char *tmp;
401
402 rc = setup_ntlmv2_rsp(ses, nls_cp);
403 if (rc) {
404 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
405 *buflen = 0;
406 goto setup_ntlmv2_ret;
407 }
408 *pbuffer = kmalloc(size_of_ntlmssp_blob(ses), GFP_KERNEL);
409 if (!*pbuffer) {
410 rc = -ENOMEM;
411 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
412 *buflen = 0;
413 goto setup_ntlmv2_ret;
414 }
415 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
416
417 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
418 sec_blob->MessageType = NtLmAuthenticate;
419
420 flags = NTLMSSP_NEGOTIATE_56 |
421 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
422 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
423 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
424 NTLMSSP_NEGOTIATE_SEAL;
425 if (ses->server->sign)
426 flags |= NTLMSSP_NEGOTIATE_SIGN;
427 if (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
428 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
429
430 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
431 sec_blob->NegotiateFlags = cpu_to_le32(flags);
432
433 sec_blob->LmChallengeResponse.BufferOffset =
434 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
435 sec_blob->LmChallengeResponse.Length = 0;
436 sec_blob->LmChallengeResponse.MaximumLength = 0;
437
438 sec_blob->NtChallengeResponse.BufferOffset =
439 cpu_to_le32(tmp - *pbuffer);
440 if (ses->user_name != NULL) {
441 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
442 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
443 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
444
445 sec_blob->NtChallengeResponse.Length =
446 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
447 sec_blob->NtChallengeResponse.MaximumLength =
448 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
449 } else {
450 /*
451 * don't send an NT Response for anonymous access
452 */
453 sec_blob->NtChallengeResponse.Length = 0;
454 sec_blob->NtChallengeResponse.MaximumLength = 0;
455 }
456
457 if (ses->domainName == NULL) {
458 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
459 sec_blob->DomainName.Length = 0;
460 sec_blob->DomainName.MaximumLength = 0;
461 tmp += 2;
462 } else {
463 int len;
464 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
465 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
466 len *= 2; /* unicode is 2 bytes each */
467 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
468 sec_blob->DomainName.Length = cpu_to_le16(len);
469 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
470 tmp += len;
471 }
472
473 if (ses->user_name == NULL) {
474 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
475 sec_blob->UserName.Length = 0;
476 sec_blob->UserName.MaximumLength = 0;
477 tmp += 2;
478 } else {
479 int len;
480 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
481 CIFS_MAX_USERNAME_LEN, nls_cp);
482 len *= 2; /* unicode is 2 bytes each */
483 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
484 sec_blob->UserName.Length = cpu_to_le16(len);
485 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
486 tmp += len;
487 }
488
489 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
490 sec_blob->WorkstationName.Length = 0;
491 sec_blob->WorkstationName.MaximumLength = 0;
492 tmp += 2;
493
494 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
495 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
496 && !calc_seckey(ses)) {
497 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
498 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
499 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
500 sec_blob->SessionKey.MaximumLength =
501 cpu_to_le16(CIFS_CPHTXT_SIZE);
502 tmp += CIFS_CPHTXT_SIZE;
503 } else {
504 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
505 sec_blob->SessionKey.Length = 0;
506 sec_blob->SessionKey.MaximumLength = 0;
507 }
508
509 *buflen = tmp - *pbuffer;
510setup_ntlmv2_ret:
511 return rc;
512}
513
514enum securityEnum
515cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
516{
517 switch (server->negflavor) {
518 case CIFS_NEGFLAVOR_EXTENDED:
519 switch (requested) {
520 case Kerberos:
521 case RawNTLMSSP:
522 return requested;
523 case Unspecified:
524 if (server->sec_ntlmssp &&
525 (global_secflags & CIFSSEC_MAY_NTLMSSP))
526 return RawNTLMSSP;
527 if ((server->sec_kerberos || server->sec_mskerberos) &&
528 (global_secflags & CIFSSEC_MAY_KRB5))
529 return Kerberos;
530 /* Fallthrough */
531 default:
532 return Unspecified;
533 }
534 case CIFS_NEGFLAVOR_UNENCAP:
535 switch (requested) {
536 case NTLM:
537 case NTLMv2:
538 return requested;
539 case Unspecified:
540 if (global_secflags & CIFSSEC_MAY_NTLMV2)
541 return NTLMv2;
542 if (global_secflags & CIFSSEC_MAY_NTLM)
543 return NTLM;
544 default:
545 break;
546 }
547 /* Fallthrough - to attempt LANMAN authentication next */
548 case CIFS_NEGFLAVOR_LANMAN:
549 switch (requested) {
550 case LANMAN:
551 return requested;
552 case Unspecified:
553 if (global_secflags & CIFSSEC_MAY_LANMAN)
554 return LANMAN;
555 /* Fallthrough */
556 default:
557 return Unspecified;
558 }
559 default:
560 return Unspecified;
561 }
562}
563
564struct sess_data {
565 unsigned int xid;
566 struct cifs_ses *ses;
567 struct nls_table *nls_cp;
568 void (*func)(struct sess_data *);
569 int result;
570
571 /* we will send the SMB in three pieces:
572 * a fixed length beginning part, an optional
573 * SPNEGO blob (which can be zero length), and a
574 * last part which will include the strings
575 * and rest of bcc area. This allows us to avoid
576 * a large buffer 17K allocation
577 */
578 int buf0_type;
579 struct kvec iov[3];
580};
581
582static int
583sess_alloc_buffer(struct sess_data *sess_data, int wct)
584{
585 int rc;
586 struct cifs_ses *ses = sess_data->ses;
587 struct smb_hdr *smb_buf;
588
589 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
590 (void **)&smb_buf);
591
592 if (rc)
593 return rc;
594
595 sess_data->iov[0].iov_base = (char *)smb_buf;
596 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
597 /*
598 * This variable will be used to clear the buffer
599 * allocated above in case of any error in the calling function.
600 */
601 sess_data->buf0_type = CIFS_SMALL_BUFFER;
602
603 /* 2000 big enough to fit max user, domain, NOS name etc. */
604 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
605 if (!sess_data->iov[2].iov_base) {
606 rc = -ENOMEM;
607 goto out_free_smb_buf;
608 }
609
610 return 0;
611
612out_free_smb_buf:
613 kfree(smb_buf);
614 sess_data->iov[0].iov_base = NULL;
615 sess_data->iov[0].iov_len = 0;
616 sess_data->buf0_type = CIFS_NO_BUFFER;
617 return rc;
618}
619
620static void
621sess_free_buffer(struct sess_data *sess_data)
622{
623
624 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
625 sess_data->buf0_type = CIFS_NO_BUFFER;
626 kfree(sess_data->iov[2].iov_base);
627}
628
629static int
630sess_establish_session(struct sess_data *sess_data)
631{
632 struct cifs_ses *ses = sess_data->ses;
633
634 mutex_lock(&ses->server->srv_mutex);
635 if (!ses->server->session_estab) {
636 if (ses->server->sign) {
637 ses->server->session_key.response =
638 kmemdup(ses->auth_key.response,
639 ses->auth_key.len, GFP_KERNEL);
640 if (!ses->server->session_key.response) {
641 mutex_unlock(&ses->server->srv_mutex);
642 return -ENOMEM;
643 }
644 ses->server->session_key.len =
645 ses->auth_key.len;
646 }
647 ses->server->sequence_number = 0x2;
648 ses->server->session_estab = true;
649 }
650 mutex_unlock(&ses->server->srv_mutex);
651
652 cifs_dbg(FYI, "CIFS session established successfully\n");
653 spin_lock(&GlobalMid_Lock);
654 ses->status = CifsGood;
655 ses->need_reconnect = false;
656 spin_unlock(&GlobalMid_Lock);
657
658 return 0;
659}
660
661static int
662sess_sendreceive(struct sess_data *sess_data)
663{
664 int rc;
665 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
666 __u16 count;
667 struct kvec rsp_iov = { NULL, 0 };
668
669 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
670 smb_buf->smb_buf_length =
671 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
672 put_bcc(count, smb_buf);
673
674 rc = SendReceive2(sess_data->xid, sess_data->ses,
675 sess_data->iov, 3 /* num_iovecs */,
676 &sess_data->buf0_type,
677 CIFS_LOG_ERROR, &rsp_iov);
678 cifs_small_buf_release(sess_data->iov[0].iov_base);
679 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
680
681 return rc;
682}
683
684/*
685 * LANMAN and plaintext are less secure and off by default.
686 * So we make this explicitly be turned on in kconfig (in the
687 * build) and turned on at runtime (changed from the default)
688 * in proc/fs/cifs or via mount parm. Unfortunately this is
689 * needed for old Win (e.g. Win95), some obscure NAS and OS/2
690 */
691#ifdef CONFIG_CIFS_WEAK_PW_HASH
692static void
693sess_auth_lanman(struct sess_data *sess_data)
694{
695 int rc = 0;
696 struct smb_hdr *smb_buf;
697 SESSION_SETUP_ANDX *pSMB;
698 char *bcc_ptr;
699 struct cifs_ses *ses = sess_data->ses;
700 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
701 __u16 bytes_remaining;
702
703 /* lanman 2 style sessionsetup */
704 /* wct = 10 */
705 rc = sess_alloc_buffer(sess_data, 10);
706 if (rc)
707 goto out;
708
709 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
710 bcc_ptr = sess_data->iov[2].iov_base;
711 (void)cifs_ssetup_hdr(ses, pSMB);
712
713 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
714
715 if (ses->user_name != NULL) {
716 /* no capabilities flags in old lanman negotiation */
717 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
718
719 /* Calculate hash with password and copy into bcc_ptr.
720 * Encryption Key (stored as in cryptkey) gets used if the
721 * security mode bit in Negottiate Protocol response states
722 * to use challenge/response method (i.e. Password bit is 1).
723 */
724 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
725 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
726 true : false, lnm_session_key);
727 if (rc)
728 goto out;
729
730 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
731 bcc_ptr += CIFS_AUTH_RESP_SIZE;
732 } else {
733 pSMB->old_req.PasswordLength = 0;
734 }
735
736 /*
737 * can not sign if LANMAN negotiated so no need
738 * to calculate signing key? but what if server
739 * changed to do higher than lanman dialect and
740 * we reconnected would we ever calc signing_key?
741 */
742
743 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
744 /* Unicode not allowed for LANMAN dialects */
745 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
746
747 sess_data->iov[2].iov_len = (long) bcc_ptr -
748 (long) sess_data->iov[2].iov_base;
749
750 rc = sess_sendreceive(sess_data);
751 if (rc)
752 goto out;
753
754 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
755 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
756
757 /* lanman response has a word count of 3 */
758 if (smb_buf->WordCount != 3) {
759 rc = -EIO;
760 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
761 goto out;
762 }
763
764 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
765 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
766
767 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
768 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
769
770 bytes_remaining = get_bcc(smb_buf);
771 bcc_ptr = pByteArea(smb_buf);
772
773 /* BB check if Unicode and decode strings */
774 if (bytes_remaining == 0) {
775 /* no string area to decode, do nothing */
776 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
777 /* unicode string area must be word-aligned */
778 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
779 ++bcc_ptr;
780 --bytes_remaining;
781 }
782 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
783 sess_data->nls_cp);
784 } else {
785 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
786 sess_data->nls_cp);
787 }
788
789 rc = sess_establish_session(sess_data);
790out:
791 sess_data->result = rc;
792 sess_data->func = NULL;
793 sess_free_buffer(sess_data);
794}
795
796#endif
797
798static void
799sess_auth_ntlm(struct sess_data *sess_data)
800{
801 int rc = 0;
802 struct smb_hdr *smb_buf;
803 SESSION_SETUP_ANDX *pSMB;
804 char *bcc_ptr;
805 struct cifs_ses *ses = sess_data->ses;
806 __u32 capabilities;
807 __u16 bytes_remaining;
808
809 /* old style NTLM sessionsetup */
810 /* wct = 13 */
811 rc = sess_alloc_buffer(sess_data, 13);
812 if (rc)
813 goto out;
814
815 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
816 bcc_ptr = sess_data->iov[2].iov_base;
817 capabilities = cifs_ssetup_hdr(ses, pSMB);
818
819 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
820 if (ses->user_name != NULL) {
821 pSMB->req_no_secext.CaseInsensitivePasswordLength =
822 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
823 pSMB->req_no_secext.CaseSensitivePasswordLength =
824 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
825
826 /* calculate ntlm response and session key */
827 rc = setup_ntlm_response(ses, sess_data->nls_cp);
828 if (rc) {
829 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
830 rc);
831 goto out;
832 }
833
834 /* copy ntlm response */
835 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
836 CIFS_AUTH_RESP_SIZE);
837 bcc_ptr += CIFS_AUTH_RESP_SIZE;
838 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
839 CIFS_AUTH_RESP_SIZE);
840 bcc_ptr += CIFS_AUTH_RESP_SIZE;
841 } else {
842 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
843 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
844 }
845
846 if (ses->capabilities & CAP_UNICODE) {
847 /* unicode strings must be word aligned */
848 if (sess_data->iov[0].iov_len % 2) {
849 *bcc_ptr = 0;
850 bcc_ptr++;
851 }
852 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
853 } else {
854 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
855 }
856
857
858 sess_data->iov[2].iov_len = (long) bcc_ptr -
859 (long) sess_data->iov[2].iov_base;
860
861 rc = sess_sendreceive(sess_data);
862 if (rc)
863 goto out;
864
865 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
866 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
867
868 if (smb_buf->WordCount != 3) {
869 rc = -EIO;
870 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
871 goto out;
872 }
873
874 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
875 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
876
877 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
878 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
879
880 bytes_remaining = get_bcc(smb_buf);
881 bcc_ptr = pByteArea(smb_buf);
882
883 /* BB check if Unicode and decode strings */
884 if (bytes_remaining == 0) {
885 /* no string area to decode, do nothing */
886 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
887 /* unicode string area must be word-aligned */
888 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
889 ++bcc_ptr;
890 --bytes_remaining;
891 }
892 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
893 sess_data->nls_cp);
894 } else {
895 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
896 sess_data->nls_cp);
897 }
898
899 rc = sess_establish_session(sess_data);
900out:
901 sess_data->result = rc;
902 sess_data->func = NULL;
903 sess_free_buffer(sess_data);
904 kfree(ses->auth_key.response);
905 ses->auth_key.response = NULL;
906}
907
908static void
909sess_auth_ntlmv2(struct sess_data *sess_data)
910{
911 int rc = 0;
912 struct smb_hdr *smb_buf;
913 SESSION_SETUP_ANDX *pSMB;
914 char *bcc_ptr;
915 struct cifs_ses *ses = sess_data->ses;
916 __u32 capabilities;
917 __u16 bytes_remaining;
918
919 /* old style NTLM sessionsetup */
920 /* wct = 13 */
921 rc = sess_alloc_buffer(sess_data, 13);
922 if (rc)
923 goto out;
924
925 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
926 bcc_ptr = sess_data->iov[2].iov_base;
927 capabilities = cifs_ssetup_hdr(ses, pSMB);
928
929 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
930
931 /* LM2 password would be here if we supported it */
932 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
933
934 if (ses->user_name != NULL) {
935 /* calculate nlmv2 response and session key */
936 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
937 if (rc) {
938 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
939 goto out;
940 }
941
942 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
943 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
944 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
945
946 /* set case sensitive password length after tilen may get
947 * assigned, tilen is 0 otherwise.
948 */
949 pSMB->req_no_secext.CaseSensitivePasswordLength =
950 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
951 } else {
952 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
953 }
954
955 if (ses->capabilities & CAP_UNICODE) {
956 if (sess_data->iov[0].iov_len % 2) {
957 *bcc_ptr = 0;
958 bcc_ptr++;
959 }
960 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
961 } else {
962 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
963 }
964
965
966 sess_data->iov[2].iov_len = (long) bcc_ptr -
967 (long) sess_data->iov[2].iov_base;
968
969 rc = sess_sendreceive(sess_data);
970 if (rc)
971 goto out;
972
973 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
974 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
975
976 if (smb_buf->WordCount != 3) {
977 rc = -EIO;
978 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
979 goto out;
980 }
981
982 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
983 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
984
985 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
986 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
987
988 bytes_remaining = get_bcc(smb_buf);
989 bcc_ptr = pByteArea(smb_buf);
990
991 /* BB check if Unicode and decode strings */
992 if (bytes_remaining == 0) {
993 /* no string area to decode, do nothing */
994 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
995 /* unicode string area must be word-aligned */
996 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
997 ++bcc_ptr;
998 --bytes_remaining;
999 }
1000 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1001 sess_data->nls_cp);
1002 } else {
1003 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1004 sess_data->nls_cp);
1005 }
1006
1007 rc = sess_establish_session(sess_data);
1008out:
1009 sess_data->result = rc;
1010 sess_data->func = NULL;
1011 sess_free_buffer(sess_data);
1012 kfree(ses->auth_key.response);
1013 ses->auth_key.response = NULL;
1014}
1015
1016#ifdef CONFIG_CIFS_UPCALL
1017static void
1018sess_auth_kerberos(struct sess_data *sess_data)
1019{
1020 int rc = 0;
1021 struct smb_hdr *smb_buf;
1022 SESSION_SETUP_ANDX *pSMB;
1023 char *bcc_ptr;
1024 struct cifs_ses *ses = sess_data->ses;
1025 __u32 capabilities;
1026 __u16 bytes_remaining;
1027 struct key *spnego_key = NULL;
1028 struct cifs_spnego_msg *msg;
1029 u16 blob_len;
1030
1031 /* extended security */
1032 /* wct = 12 */
1033 rc = sess_alloc_buffer(sess_data, 12);
1034 if (rc)
1035 goto out;
1036
1037 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1038 bcc_ptr = sess_data->iov[2].iov_base;
1039 capabilities = cifs_ssetup_hdr(ses, pSMB);
1040
1041 spnego_key = cifs_get_spnego_key(ses);
1042 if (IS_ERR(spnego_key)) {
1043 rc = PTR_ERR(spnego_key);
1044 spnego_key = NULL;
1045 goto out;
1046 }
1047
1048 msg = spnego_key->payload.data[0];
1049 /*
1050 * check version field to make sure that cifs.upcall is
1051 * sending us a response in an expected form
1052 */
1053 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1054 cifs_dbg(VFS,
1055 "incorrect version of cifs.upcall (expected %d but got %d)",
1056 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1057 rc = -EKEYREJECTED;
1058 goto out_put_spnego_key;
1059 }
1060
1061 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1062 GFP_KERNEL);
1063 if (!ses->auth_key.response) {
1064 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory",
1065 msg->sesskey_len);
1066 rc = -ENOMEM;
1067 goto out_put_spnego_key;
1068 }
1069 ses->auth_key.len = msg->sesskey_len;
1070
1071 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1072 capabilities |= CAP_EXTENDED_SECURITY;
1073 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1074 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1075 sess_data->iov[1].iov_len = msg->secblob_len;
1076 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1077
1078 if (ses->capabilities & CAP_UNICODE) {
1079 /* unicode strings must be word aligned */
1080 if ((sess_data->iov[0].iov_len
1081 + sess_data->iov[1].iov_len) % 2) {
1082 *bcc_ptr = 0;
1083 bcc_ptr++;
1084 }
1085 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1086 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1087 } else {
1088 /* BB: is this right? */
1089 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1090 }
1091
1092 sess_data->iov[2].iov_len = (long) bcc_ptr -
1093 (long) sess_data->iov[2].iov_base;
1094
1095 rc = sess_sendreceive(sess_data);
1096 if (rc)
1097 goto out_put_spnego_key;
1098
1099 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1100 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1101
1102 if (smb_buf->WordCount != 4) {
1103 rc = -EIO;
1104 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1105 goto out_put_spnego_key;
1106 }
1107
1108 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1109 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1110
1111 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1112 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1113
1114 bytes_remaining = get_bcc(smb_buf);
1115 bcc_ptr = pByteArea(smb_buf);
1116
1117 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1118 if (blob_len > bytes_remaining) {
1119 cifs_dbg(VFS, "bad security blob length %d\n",
1120 blob_len);
1121 rc = -EINVAL;
1122 goto out_put_spnego_key;
1123 }
1124 bcc_ptr += blob_len;
1125 bytes_remaining -= blob_len;
1126
1127 /* BB check if Unicode and decode strings */
1128 if (bytes_remaining == 0) {
1129 /* no string area to decode, do nothing */
1130 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1131 /* unicode string area must be word-aligned */
1132 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1133 ++bcc_ptr;
1134 --bytes_remaining;
1135 }
1136 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1137 sess_data->nls_cp);
1138 } else {
1139 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1140 sess_data->nls_cp);
1141 }
1142
1143 rc = sess_establish_session(sess_data);
1144out_put_spnego_key:
1145 key_invalidate(spnego_key);
1146 key_put(spnego_key);
1147out:
1148 sess_data->result = rc;
1149 sess_data->func = NULL;
1150 sess_free_buffer(sess_data);
1151 kfree(ses->auth_key.response);
1152 ses->auth_key.response = NULL;
1153}
1154
1155#endif /* ! CONFIG_CIFS_UPCALL */
1156
1157/*
1158 * The required kvec buffers have to be allocated before calling this
1159 * function.
1160 */
1161static int
1162_sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1163{
1164 SESSION_SETUP_ANDX *pSMB;
1165 struct cifs_ses *ses = sess_data->ses;
1166 __u32 capabilities;
1167 char *bcc_ptr;
1168
1169 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1170
1171 capabilities = cifs_ssetup_hdr(ses, pSMB);
1172 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1173 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1174 return -ENOSYS;
1175 }
1176
1177 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1178 capabilities |= CAP_EXTENDED_SECURITY;
1179 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1180
1181 bcc_ptr = sess_data->iov[2].iov_base;
1182 /* unicode strings must be word aligned */
1183 if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1184 *bcc_ptr = 0;
1185 bcc_ptr++;
1186 }
1187 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1188
1189 sess_data->iov[2].iov_len = (long) bcc_ptr -
1190 (long) sess_data->iov[2].iov_base;
1191
1192 return 0;
1193}
1194
1195static void
1196sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1197
1198static void
1199sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1200{
1201 int rc;
1202 struct smb_hdr *smb_buf;
1203 SESSION_SETUP_ANDX *pSMB;
1204 struct cifs_ses *ses = sess_data->ses;
1205 __u16 bytes_remaining;
1206 char *bcc_ptr;
1207 u16 blob_len;
1208
1209 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1210
1211 /*
1212 * if memory allocation is successful, caller of this function
1213 * frees it.
1214 */
1215 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1216 if (!ses->ntlmssp) {
1217 rc = -ENOMEM;
1218 goto out;
1219 }
1220 ses->ntlmssp->sesskey_per_smbsess = false;
1221
1222 /* wct = 12 */
1223 rc = sess_alloc_buffer(sess_data, 12);
1224 if (rc)
1225 goto out;
1226
1227 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1228
1229 /* Build security blob before we assemble the request */
1230 build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
1231 sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
1232 sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
1233 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
1234
1235 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1236 if (rc)
1237 goto out;
1238
1239 rc = sess_sendreceive(sess_data);
1240
1241 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1242 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1243
1244 /* If true, rc here is expected and not an error */
1245 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1246 smb_buf->Status.CifsError ==
1247 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1248 rc = 0;
1249
1250 if (rc)
1251 goto out;
1252
1253 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1254
1255 if (smb_buf->WordCount != 4) {
1256 rc = -EIO;
1257 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1258 goto out;
1259 }
1260
1261 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1262 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1263
1264 bytes_remaining = get_bcc(smb_buf);
1265 bcc_ptr = pByteArea(smb_buf);
1266
1267 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1268 if (blob_len > bytes_remaining) {
1269 cifs_dbg(VFS, "bad security blob length %d\n",
1270 blob_len);
1271 rc = -EINVAL;
1272 goto out;
1273 }
1274
1275 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1276out:
1277 sess_free_buffer(sess_data);
1278
1279 if (!rc) {
1280 sess_data->func = sess_auth_rawntlmssp_authenticate;
1281 return;
1282 }
1283
1284 /* Else error. Cleanup */
1285 kfree(ses->auth_key.response);
1286 ses->auth_key.response = NULL;
1287 kfree(ses->ntlmssp);
1288 ses->ntlmssp = NULL;
1289
1290 sess_data->func = NULL;
1291 sess_data->result = rc;
1292}
1293
1294static void
1295sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1296{
1297 int rc;
1298 struct smb_hdr *smb_buf;
1299 SESSION_SETUP_ANDX *pSMB;
1300 struct cifs_ses *ses = sess_data->ses;
1301 __u16 bytes_remaining;
1302 char *bcc_ptr;
1303 unsigned char *ntlmsspblob = NULL;
1304 u16 blob_len;
1305
1306 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1307
1308 /* wct = 12 */
1309 rc = sess_alloc_buffer(sess_data, 12);
1310 if (rc)
1311 goto out;
1312
1313 /* Build security blob before we assemble the request */
1314 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1315 smb_buf = (struct smb_hdr *)pSMB;
1316 rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1317 &blob_len, ses, sess_data->nls_cp);
1318 if (rc)
1319 goto out_free_ntlmsspblob;
1320 sess_data->iov[1].iov_len = blob_len;
1321 sess_data->iov[1].iov_base = ntlmsspblob;
1322 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1323 /*
1324 * Make sure that we tell the server that we are using
1325 * the uid that it just gave us back on the response
1326 * (challenge)
1327 */
1328 smb_buf->Uid = ses->Suid;
1329
1330 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1331 if (rc)
1332 goto out_free_ntlmsspblob;
1333
1334 rc = sess_sendreceive(sess_data);
1335 if (rc)
1336 goto out_free_ntlmsspblob;
1337
1338 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1339 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1340 if (smb_buf->WordCount != 4) {
1341 rc = -EIO;
1342 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1343 goto out_free_ntlmsspblob;
1344 }
1345
1346 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1347 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1348
1349 if (ses->Suid != smb_buf->Uid) {
1350 ses->Suid = smb_buf->Uid;
1351 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1352 }
1353
1354 bytes_remaining = get_bcc(smb_buf);
1355 bcc_ptr = pByteArea(smb_buf);
1356 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1357 if (blob_len > bytes_remaining) {
1358 cifs_dbg(VFS, "bad security blob length %d\n",
1359 blob_len);
1360 rc = -EINVAL;
1361 goto out_free_ntlmsspblob;
1362 }
1363 bcc_ptr += blob_len;
1364 bytes_remaining -= blob_len;
1365
1366
1367 /* BB check if Unicode and decode strings */
1368 if (bytes_remaining == 0) {
1369 /* no string area to decode, do nothing */
1370 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1371 /* unicode string area must be word-aligned */
1372 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1373 ++bcc_ptr;
1374 --bytes_remaining;
1375 }
1376 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1377 sess_data->nls_cp);
1378 } else {
1379 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1380 sess_data->nls_cp);
1381 }
1382
1383out_free_ntlmsspblob:
1384 kfree(ntlmsspblob);
1385out:
1386 sess_free_buffer(sess_data);
1387
1388 if (!rc)
1389 rc = sess_establish_session(sess_data);
1390
1391 /* Cleanup */
1392 kfree(ses->auth_key.response);
1393 ses->auth_key.response = NULL;
1394 kfree(ses->ntlmssp);
1395 ses->ntlmssp = NULL;
1396
1397 sess_data->func = NULL;
1398 sess_data->result = rc;
1399}
1400
1401static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
1402{
1403 int type;
1404
1405 type = cifs_select_sectype(ses->server, ses->sectype);
1406 cifs_dbg(FYI, "sess setup type %d\n", type);
1407 if (type == Unspecified) {
1408 cifs_dbg(VFS,
1409 "Unable to select appropriate authentication method!");
1410 return -EINVAL;
1411 }
1412
1413 switch (type) {
1414 case LANMAN:
1415 /* LANMAN and plaintext are less secure and off by default.
1416 * So we make this explicitly be turned on in kconfig (in the
1417 * build) and turned on at runtime (changed from the default)
1418 * in proc/fs/cifs or via mount parm. Unfortunately this is
1419 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
1420#ifdef CONFIG_CIFS_WEAK_PW_HASH
1421 sess_data->func = sess_auth_lanman;
1422 break;
1423#else
1424 return -EOPNOTSUPP;
1425#endif
1426 case NTLM:
1427 sess_data->func = sess_auth_ntlm;
1428 break;
1429 case NTLMv2:
1430 sess_data->func = sess_auth_ntlmv2;
1431 break;
1432 case Kerberos:
1433#ifdef CONFIG_CIFS_UPCALL
1434 sess_data->func = sess_auth_kerberos;
1435 break;
1436#else
1437 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1438 return -ENOSYS;
1439 break;
1440#endif /* CONFIG_CIFS_UPCALL */
1441 case RawNTLMSSP:
1442 sess_data->func = sess_auth_rawntlmssp_negotiate;
1443 break;
1444 default:
1445 cifs_dbg(VFS, "secType %d not supported!\n", type);
1446 return -ENOSYS;
1447 }
1448
1449 return 0;
1450}
1451
1452int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1453 const struct nls_table *nls_cp)
1454{
1455 int rc = 0;
1456 struct sess_data *sess_data;
1457
1458 if (ses == NULL) {
1459 WARN(1, "%s: ses == NULL!", __func__);
1460 return -EINVAL;
1461 }
1462
1463 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1464 if (!sess_data)
1465 return -ENOMEM;
1466
1467 rc = select_sec(ses, sess_data);
1468 if (rc)
1469 goto out;
1470
1471 sess_data->xid = xid;
1472 sess_data->ses = ses;
1473 sess_data->buf0_type = CIFS_NO_BUFFER;
1474 sess_data->nls_cp = (struct nls_table *) nls_cp;
1475
1476 while (sess_data->func)
1477 sess_data->func(sess_data);
1478
1479 /* Store result before we free sess_data */
1480 rc = sess_data->result;
1481
1482out:
1483 kfree(sess_data);
1484 return rc;
1485}