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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(ses->server->maxBuf);
128 pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
129 pSMB->req.VcNumber = get_next_vcnum(ses);
130
131 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
132
133 /* BB verify whether signing required on neg or just on auth frame
134 (and NTLM case) */
135
136 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
137 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
138
139 if (ses->server->sec_mode &
140 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
141 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
142
143 if (ses->capabilities & CAP_UNICODE) {
144 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
145 capabilities |= CAP_UNICODE;
146 }
147 if (ses->capabilities & CAP_STATUS32) {
148 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
149 capabilities |= CAP_STATUS32;
150 }
151 if (ses->capabilities & CAP_DFS) {
152 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
153 capabilities |= CAP_DFS;
154 }
155 if (ses->capabilities & CAP_UNIX)
156 capabilities |= CAP_UNIX;
157
158 return capabilities;
159}
160
161static void
162unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
163{
164 char *bcc_ptr = *pbcc_area;
165 int bytes_ret = 0;
166
167 /* Copy OS version */
168 bytes_ret = cifs_strtoUCS((__le16 *)bcc_ptr, "Linux version ", 32,
169 nls_cp);
170 bcc_ptr += 2 * bytes_ret;
171 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, init_utsname()->release,
172 32, nls_cp);
173 bcc_ptr += 2 * bytes_ret;
174 bcc_ptr += 2; /* trailing null */
175
176 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
177 32, nls_cp);
178 bcc_ptr += 2 * bytes_ret;
179 bcc_ptr += 2; /* trailing null */
180
181 *pbcc_area = bcc_ptr;
182}
183
184static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
185 const struct nls_table *nls_cp)
186{
187 char *bcc_ptr = *pbcc_area;
188 int bytes_ret = 0;
189
190 /* copy domain */
191 if (ses->domainName == NULL) {
192 /* Sending null domain better than using a bogus domain name (as
193 we did briefly in 2.6.18) since server will use its default */
194 *bcc_ptr = 0;
195 *(bcc_ptr+1) = 0;
196 bytes_ret = 0;
197 } else
198 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->domainName,
199 256, nls_cp);
200 bcc_ptr += 2 * bytes_ret;
201 bcc_ptr += 2; /* account for null terminator */
202
203 *pbcc_area = bcc_ptr;
204}
205
206
207static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
208 const struct nls_table *nls_cp)
209{
210 char *bcc_ptr = *pbcc_area;
211 int bytes_ret = 0;
212
213 /* BB FIXME add check that strings total less
214 than 335 or will need to send them as arrays */
215
216 /* unicode strings, must be word aligned before the call */
217/* if ((long) bcc_ptr % 2) {
218 *bcc_ptr = 0;
219 bcc_ptr++;
220 } */
221 /* copy user */
222 if (ses->user_name == NULL) {
223 /* null user mount */
224 *bcc_ptr = 0;
225 *(bcc_ptr+1) = 0;
226 } else {
227 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->user_name,
228 MAX_USERNAME_SIZE, nls_cp);
229 }
230 bcc_ptr += 2 * bytes_ret;
231 bcc_ptr += 2; /* account for null termination */
232
233 unicode_domain_string(&bcc_ptr, ses, nls_cp);
234 unicode_oslm_strings(&bcc_ptr, nls_cp);
235
236 *pbcc_area = bcc_ptr;
237}
238
239static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
240 const struct nls_table *nls_cp)
241{
242 char *bcc_ptr = *pbcc_area;
243
244 /* copy user */
245 /* BB what about null user mounts - check that we do this BB */
246 /* copy user */
247 if (ses->user_name != NULL)
248 strncpy(bcc_ptr, ses->user_name, MAX_USERNAME_SIZE);
249 /* else null user mount */
250
251 bcc_ptr += strnlen(ses->user_name, MAX_USERNAME_SIZE);
252 *bcc_ptr = 0;
253 bcc_ptr++; /* account for null termination */
254
255 /* copy domain */
256
257 if (ses->domainName != NULL) {
258 strncpy(bcc_ptr, ses->domainName, 256);
259 bcc_ptr += strnlen(ses->domainName, 256);
260 } /* else we will send a null domain name
261 so the server will default to its own domain */
262 *bcc_ptr = 0;
263 bcc_ptr++;
264
265 /* BB check for overflow here */
266
267 strcpy(bcc_ptr, "Linux version ");
268 bcc_ptr += strlen("Linux version ");
269 strcpy(bcc_ptr, init_utsname()->release);
270 bcc_ptr += strlen(init_utsname()->release) + 1;
271
272 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
273 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
274
275 *pbcc_area = bcc_ptr;
276}
277
278static void
279decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
280 const struct nls_table *nls_cp)
281{
282 int len;
283 char *data = *pbcc_area;
284
285 cFYI(1, "bleft %d", bleft);
286
287 kfree(ses->serverOS);
288 ses->serverOS = cifs_strndup_from_ucs(data, bleft, true, nls_cp);
289 cFYI(1, "serverOS=%s", ses->serverOS);
290 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
291 data += len;
292 bleft -= len;
293 if (bleft <= 0)
294 return;
295
296 kfree(ses->serverNOS);
297 ses->serverNOS = cifs_strndup_from_ucs(data, bleft, true, nls_cp);
298 cFYI(1, "serverNOS=%s", ses->serverNOS);
299 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
300 data += len;
301 bleft -= len;
302 if (bleft <= 0)
303 return;
304
305 kfree(ses->serverDomain);
306 ses->serverDomain = cifs_strndup_from_ucs(data, bleft, true, nls_cp);
307 cFYI(1, "serverDomain=%s", ses->serverDomain);
308
309 return;
310}
311
312static int decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
313 struct cifs_ses *ses,
314 const struct nls_table *nls_cp)
315{
316 int rc = 0;
317 int len;
318 char *bcc_ptr = *pbcc_area;
319
320 cFYI(1, "decode sessetup ascii. bleft %d", bleft);
321
322 len = strnlen(bcc_ptr, bleft);
323 if (len >= bleft)
324 return rc;
325
326 kfree(ses->serverOS);
327
328 ses->serverOS = kzalloc(len + 1, GFP_KERNEL);
329 if (ses->serverOS)
330 strncpy(ses->serverOS, bcc_ptr, len);
331 if (strncmp(ses->serverOS, "OS/2", 4) == 0) {
332 cFYI(1, "OS/2 server");
333 ses->flags |= CIFS_SES_OS2;
334 }
335
336 bcc_ptr += len + 1;
337 bleft -= len + 1;
338
339 len = strnlen(bcc_ptr, bleft);
340 if (len >= bleft)
341 return rc;
342
343 kfree(ses->serverNOS);
344
345 ses->serverNOS = kzalloc(len + 1, GFP_KERNEL);
346 if (ses->serverNOS)
347 strncpy(ses->serverNOS, bcc_ptr, len);
348
349 bcc_ptr += len + 1;
350 bleft -= len + 1;
351
352 len = strnlen(bcc_ptr, bleft);
353 if (len > bleft)
354 return rc;
355
356 /* No domain field in LANMAN case. Domain is
357 returned by old servers in the SMB negprot response */
358 /* BB For newer servers which do not support Unicode,
359 but thus do return domain here we could add parsing
360 for it later, but it is not very important */
361 cFYI(1, "ascii: bytes left %d", bleft);
362
363 return rc;
364}
365
366static int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
367 struct cifs_ses *ses)
368{
369 unsigned int tioffset; /* challenge message target info area */
370 unsigned int tilen; /* challenge message target info area length */
371
372 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
373
374 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
375 cERROR(1, "challenge blob len %d too small", blob_len);
376 return -EINVAL;
377 }
378
379 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
380 cERROR(1, "blob signature incorrect %s", pblob->Signature);
381 return -EINVAL;
382 }
383 if (pblob->MessageType != NtLmChallenge) {
384 cERROR(1, "Incorrect message type %d", pblob->MessageType);
385 return -EINVAL;
386 }
387
388 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
389 /* BB we could decode pblob->NegotiateFlags; some may be useful */
390 /* In particular we can examine sign flags */
391 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
392 we must set the MIC field of the AUTHENTICATE_MESSAGE */
393 ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags);
394 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
395 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
396 if (tilen) {
397 ses->auth_key.response = kmalloc(tilen, GFP_KERNEL);
398 if (!ses->auth_key.response) {
399 cERROR(1, "Challenge target info allocation failure");
400 return -ENOMEM;
401 }
402 memcpy(ses->auth_key.response, bcc_ptr + tioffset, tilen);
403 ses->auth_key.len = tilen;
404 }
405
406 return 0;
407}
408
409/* BB Move to ntlmssp.c eventually */
410
411/* We do not malloc the blob, it is passed in pbuffer, because
412 it is fixed size, and small, making this approach cleaner */
413static void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
414 struct cifs_ses *ses)
415{
416 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer;
417 __u32 flags;
418
419 memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
420 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
421 sec_blob->MessageType = NtLmNegotiate;
422
423 /* BB is NTLMV2 session security format easier to use here? */
424 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
425 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
426 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
427 if (ses->server->sec_mode &
428 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
429 flags |= NTLMSSP_NEGOTIATE_SIGN;
430 if (!ses->server->session_estab)
431 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
432 }
433
434 sec_blob->NegotiateFlags = cpu_to_le32(flags);
435
436 sec_blob->WorkstationName.BufferOffset = 0;
437 sec_blob->WorkstationName.Length = 0;
438 sec_blob->WorkstationName.MaximumLength = 0;
439
440 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
441 sec_blob->DomainName.BufferOffset = 0;
442 sec_blob->DomainName.Length = 0;
443 sec_blob->DomainName.MaximumLength = 0;
444}
445
446/* We do not malloc the blob, it is passed in pbuffer, because its
447 maximum possible size is fixed and small, making this approach cleaner.
448 This function returns the length of the data in the blob */
449static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
450 u16 *buflen,
451 struct cifs_ses *ses,
452 const struct nls_table *nls_cp)
453{
454 int rc;
455 AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer;
456 __u32 flags;
457 unsigned char *tmp;
458
459 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
460 sec_blob->MessageType = NtLmAuthenticate;
461
462 flags = NTLMSSP_NEGOTIATE_56 |
463 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
464 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
465 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
466 if (ses->server->sec_mode &
467 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
468 flags |= NTLMSSP_NEGOTIATE_SIGN;
469 if (!ses->server->session_estab)
470 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
471 }
472
473 tmp = pbuffer + sizeof(AUTHENTICATE_MESSAGE);
474 sec_blob->NegotiateFlags = cpu_to_le32(flags);
475
476 sec_blob->LmChallengeResponse.BufferOffset =
477 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
478 sec_blob->LmChallengeResponse.Length = 0;
479 sec_blob->LmChallengeResponse.MaximumLength = 0;
480
481 sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer);
482 rc = setup_ntlmv2_rsp(ses, nls_cp);
483 if (rc) {
484 cERROR(1, "Error %d during NTLMSSP authentication", rc);
485 goto setup_ntlmv2_ret;
486 }
487 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
488 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
489 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
490
491 sec_blob->NtChallengeResponse.Length =
492 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
493 sec_blob->NtChallengeResponse.MaximumLength =
494 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
495
496 if (ses->domainName == NULL) {
497 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
498 sec_blob->DomainName.Length = 0;
499 sec_blob->DomainName.MaximumLength = 0;
500 tmp += 2;
501 } else {
502 int len;
503 len = cifs_strtoUCS((__le16 *)tmp, ses->domainName,
504 MAX_USERNAME_SIZE, nls_cp);
505 len *= 2; /* unicode is 2 bytes each */
506 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
507 sec_blob->DomainName.Length = cpu_to_le16(len);
508 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
509 tmp += len;
510 }
511
512 if (ses->user_name == NULL) {
513 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
514 sec_blob->UserName.Length = 0;
515 sec_blob->UserName.MaximumLength = 0;
516 tmp += 2;
517 } else {
518 int len;
519 len = cifs_strtoUCS((__le16 *)tmp, ses->user_name,
520 MAX_USERNAME_SIZE, nls_cp);
521 len *= 2; /* unicode is 2 bytes each */
522 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
523 sec_blob->UserName.Length = cpu_to_le16(len);
524 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
525 tmp += len;
526 }
527
528 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - pbuffer);
529 sec_blob->WorkstationName.Length = 0;
530 sec_blob->WorkstationName.MaximumLength = 0;
531 tmp += 2;
532
533 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
534 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
535 && !calc_seckey(ses)) {
536 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
537 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
538 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
539 sec_blob->SessionKey.MaximumLength =
540 cpu_to_le16(CIFS_CPHTXT_SIZE);
541 tmp += CIFS_CPHTXT_SIZE;
542 } else {
543 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
544 sec_blob->SessionKey.Length = 0;
545 sec_blob->SessionKey.MaximumLength = 0;
546 }
547
548setup_ntlmv2_ret:
549 *buflen = tmp - pbuffer;
550 return rc;
551}
552
553int
554CIFS_SessSetup(unsigned int xid, struct cifs_ses *ses,
555 const struct nls_table *nls_cp)
556{
557 int rc = 0;
558 int wct;
559 struct smb_hdr *smb_buf;
560 char *bcc_ptr;
561 char *str_area;
562 SESSION_SETUP_ANDX *pSMB;
563 __u32 capabilities;
564 __u16 count;
565 int resp_buf_type;
566 struct kvec iov[3];
567 enum securityEnum type;
568 __u16 action, bytes_remaining;
569 struct key *spnego_key = NULL;
570 __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
571 u16 blob_len;
572 char *ntlmsspblob = NULL;
573
574 if (ses == NULL)
575 return -EINVAL;
576
577 type = ses->server->secType;
578 cFYI(1, "sess setup type %d", type);
579 if (type == RawNTLMSSP) {
580 /* if memory allocation is successful, caller of this function
581 * frees it.
582 */
583 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
584 if (!ses->ntlmssp)
585 return -ENOMEM;
586 }
587
588ssetup_ntlmssp_authenticate:
589 if (phase == NtLmChallenge)
590 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
591
592 if (type == LANMAN) {
593#ifndef CONFIG_CIFS_WEAK_PW_HASH
594 /* LANMAN and plaintext are less secure and off by default.
595 So we make this explicitly be turned on in kconfig (in the
596 build) and turned on at runtime (changed from the default)
597 in proc/fs/cifs or via mount parm. Unfortunately this is
598 needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
599 return -EOPNOTSUPP;
600#endif
601 wct = 10; /* lanman 2 style sessionsetup */
602 } else if ((type == NTLM) || (type == NTLMv2)) {
603 /* For NTLMv2 failures eventually may need to retry NTLM */
604 wct = 13; /* old style NTLM sessionsetup */
605 } else /* same size: negotiate or auth, NTLMSSP or extended security */
606 wct = 12;
607
608 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
609 (void **)&smb_buf);
610 if (rc)
611 return rc;
612
613 pSMB = (SESSION_SETUP_ANDX *)smb_buf;
614
615 capabilities = cifs_ssetup_hdr(ses, pSMB);
616
617 /* we will send the SMB in three pieces:
618 a fixed length beginning part, an optional
619 SPNEGO blob (which can be zero length), and a
620 last part which will include the strings
621 and rest of bcc area. This allows us to avoid
622 a large buffer 17K allocation */
623 iov[0].iov_base = (char *)pSMB;
624 iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
625
626 /* setting this here allows the code at the end of the function
627 to free the request buffer if there's an error */
628 resp_buf_type = CIFS_SMALL_BUFFER;
629
630 /* 2000 big enough to fit max user, domain, NOS name etc. */
631 str_area = kmalloc(2000, GFP_KERNEL);
632 if (str_area == NULL) {
633 rc = -ENOMEM;
634 goto ssetup_exit;
635 }
636 bcc_ptr = str_area;
637
638 ses->flags &= ~CIFS_SES_LANMAN;
639
640 iov[1].iov_base = NULL;
641 iov[1].iov_len = 0;
642
643 if (type == LANMAN) {
644#ifdef CONFIG_CIFS_WEAK_PW_HASH
645 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
646
647 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
648
649 /* no capabilities flags in old lanman negotiation */
650
651 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
652
653 /* Calculate hash with password and copy into bcc_ptr.
654 * Encryption Key (stored as in cryptkey) gets used if the
655 * security mode bit in Negottiate Protocol response states
656 * to use challenge/response method (i.e. Password bit is 1).
657 */
658
659 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
660 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
661 true : false, lnm_session_key);
662
663 ses->flags |= CIFS_SES_LANMAN;
664 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
665 bcc_ptr += CIFS_AUTH_RESP_SIZE;
666
667 /* can not sign if LANMAN negotiated so no need
668 to calculate signing key? but what if server
669 changed to do higher than lanman dialect and
670 we reconnected would we ever calc signing_key? */
671
672 cFYI(1, "Negotiating LANMAN setting up strings");
673 /* Unicode not allowed for LANMAN dialects */
674 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
675#endif
676 } else if (type == NTLM) {
677 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
678 pSMB->req_no_secext.CaseInsensitivePasswordLength =
679 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
680 pSMB->req_no_secext.CaseSensitivePasswordLength =
681 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
682
683 /* calculate ntlm response and session key */
684 rc = setup_ntlm_response(ses);
685 if (rc) {
686 cERROR(1, "Error %d during NTLM authentication", rc);
687 goto ssetup_exit;
688 }
689
690 /* copy ntlm response */
691 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
692 CIFS_AUTH_RESP_SIZE);
693 bcc_ptr += CIFS_AUTH_RESP_SIZE;
694 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
695 CIFS_AUTH_RESP_SIZE);
696 bcc_ptr += CIFS_AUTH_RESP_SIZE;
697
698 if (ses->capabilities & CAP_UNICODE) {
699 /* unicode strings must be word aligned */
700 if (iov[0].iov_len % 2) {
701 *bcc_ptr = 0;
702 bcc_ptr++;
703 }
704 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
705 } else
706 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
707 } else if (type == NTLMv2) {
708 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
709
710 /* LM2 password would be here if we supported it */
711 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
712
713 /* calculate nlmv2 response and session key */
714 rc = setup_ntlmv2_rsp(ses, nls_cp);
715 if (rc) {
716 cERROR(1, "Error %d during NTLMv2 authentication", rc);
717 goto ssetup_exit;
718 }
719 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
720 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
721 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
722
723 /* set case sensitive password length after tilen may get
724 * assigned, tilen is 0 otherwise.
725 */
726 pSMB->req_no_secext.CaseSensitivePasswordLength =
727 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
728
729 if (ses->capabilities & CAP_UNICODE) {
730 if (iov[0].iov_len % 2) {
731 *bcc_ptr = 0;
732 bcc_ptr++;
733 }
734 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
735 } else
736 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
737 } else if (type == Kerberos) {
738#ifdef CONFIG_CIFS_UPCALL
739 struct cifs_spnego_msg *msg;
740
741 spnego_key = cifs_get_spnego_key(ses);
742 if (IS_ERR(spnego_key)) {
743 rc = PTR_ERR(spnego_key);
744 spnego_key = NULL;
745 goto ssetup_exit;
746 }
747
748 msg = spnego_key->payload.data;
749 /* check version field to make sure that cifs.upcall is
750 sending us a response in an expected form */
751 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
752 cERROR(1, "incorrect version of cifs.upcall (expected"
753 " %d but got %d)",
754 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
755 rc = -EKEYREJECTED;
756 goto ssetup_exit;
757 }
758
759 ses->auth_key.response = kmalloc(msg->sesskey_len, GFP_KERNEL);
760 if (!ses->auth_key.response) {
761 cERROR(1, "Kerberos can't allocate (%u bytes) memory",
762 msg->sesskey_len);
763 rc = -ENOMEM;
764 goto ssetup_exit;
765 }
766 memcpy(ses->auth_key.response, msg->data, msg->sesskey_len);
767 ses->auth_key.len = msg->sesskey_len;
768
769 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
770 capabilities |= CAP_EXTENDED_SECURITY;
771 pSMB->req.Capabilities = cpu_to_le32(capabilities);
772 iov[1].iov_base = msg->data + msg->sesskey_len;
773 iov[1].iov_len = msg->secblob_len;
774 pSMB->req.SecurityBlobLength = cpu_to_le16(iov[1].iov_len);
775
776 if (ses->capabilities & CAP_UNICODE) {
777 /* unicode strings must be word aligned */
778 if ((iov[0].iov_len + iov[1].iov_len) % 2) {
779 *bcc_ptr = 0;
780 bcc_ptr++;
781 }
782 unicode_oslm_strings(&bcc_ptr, nls_cp);
783 unicode_domain_string(&bcc_ptr, ses, nls_cp);
784 } else
785 /* BB: is this right? */
786 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
787#else /* ! CONFIG_CIFS_UPCALL */
788 cERROR(1, "Kerberos negotiated but upcall support disabled!");
789 rc = -ENOSYS;
790 goto ssetup_exit;
791#endif /* CONFIG_CIFS_UPCALL */
792 } else if (type == RawNTLMSSP) {
793 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
794 cERROR(1, "NTLMSSP requires Unicode support");
795 rc = -ENOSYS;
796 goto ssetup_exit;
797 }
798
799 cFYI(1, "ntlmssp session setup phase %d", phase);
800 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
801 capabilities |= CAP_EXTENDED_SECURITY;
802 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
803 switch(phase) {
804 case NtLmNegotiate:
805 build_ntlmssp_negotiate_blob(
806 pSMB->req.SecurityBlob, ses);
807 iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
808 iov[1].iov_base = pSMB->req.SecurityBlob;
809 pSMB->req.SecurityBlobLength =
810 cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
811 break;
812 case NtLmAuthenticate:
813 /*
814 * 5 is an empirical value, large enough to hold
815 * authenticate message plus max 10 of av paris,
816 * domain, user, workstation names, flags, etc.
817 */
818 ntlmsspblob = kzalloc(
819 5*sizeof(struct _AUTHENTICATE_MESSAGE),
820 GFP_KERNEL);
821 if (!ntlmsspblob) {
822 cERROR(1, "Can't allocate NTLMSSP blob");
823 rc = -ENOMEM;
824 goto ssetup_exit;
825 }
826
827 rc = build_ntlmssp_auth_blob(ntlmsspblob,
828 &blob_len, ses, nls_cp);
829 if (rc)
830 goto ssetup_exit;
831 iov[1].iov_len = blob_len;
832 iov[1].iov_base = ntlmsspblob;
833 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
834 /*
835 * Make sure that we tell the server that we are using
836 * the uid that it just gave us back on the response
837 * (challenge)
838 */
839 smb_buf->Uid = ses->Suid;
840 break;
841 default:
842 cERROR(1, "invalid phase %d", phase);
843 rc = -ENOSYS;
844 goto ssetup_exit;
845 }
846 /* unicode strings must be word aligned */
847 if ((iov[0].iov_len + iov[1].iov_len) % 2) {
848 *bcc_ptr = 0;
849 bcc_ptr++;
850 }
851 unicode_oslm_strings(&bcc_ptr, nls_cp);
852 } else {
853 cERROR(1, "secType %d not supported!", type);
854 rc = -ENOSYS;
855 goto ssetup_exit;
856 }
857
858 iov[2].iov_base = str_area;
859 iov[2].iov_len = (long) bcc_ptr - (long) str_area;
860
861 count = iov[1].iov_len + iov[2].iov_len;
862 smb_buf->smb_buf_length =
863 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
864
865 put_bcc(count, smb_buf);
866
867 rc = SendReceive2(xid, ses, iov, 3 /* num_iovecs */, &resp_buf_type,
868 CIFS_LOG_ERROR);
869 /* SMB request buf freed in SendReceive2 */
870
871 pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base;
872 smb_buf = (struct smb_hdr *)iov[0].iov_base;
873
874 if ((type == RawNTLMSSP) && (smb_buf->Status.CifsError ==
875 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))) {
876 if (phase != NtLmNegotiate) {
877 cERROR(1, "Unexpected more processing error");
878 goto ssetup_exit;
879 }
880 /* NTLMSSP Negotiate sent now processing challenge (response) */
881 phase = NtLmChallenge; /* process ntlmssp challenge */
882 rc = 0; /* MORE_PROC rc is not an error here, but expected */
883 }
884 if (rc)
885 goto ssetup_exit;
886
887 if ((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) {
888 rc = -EIO;
889 cERROR(1, "bad word count %d", smb_buf->WordCount);
890 goto ssetup_exit;
891 }
892 action = le16_to_cpu(pSMB->resp.Action);
893 if (action & GUEST_LOGIN)
894 cFYI(1, "Guest login"); /* BB mark SesInfo struct? */
895 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
896 cFYI(1, "UID = %d ", ses->Suid);
897 /* response can have either 3 or 4 word count - Samba sends 3 */
898 /* and lanman response is 3 */
899 bytes_remaining = get_bcc(smb_buf);
900 bcc_ptr = pByteArea(smb_buf);
901
902 if (smb_buf->WordCount == 4) {
903 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
904 if (blob_len > bytes_remaining) {
905 cERROR(1, "bad security blob length %d", blob_len);
906 rc = -EINVAL;
907 goto ssetup_exit;
908 }
909 if (phase == NtLmChallenge) {
910 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
911 /* now goto beginning for ntlmssp authenticate phase */
912 if (rc)
913 goto ssetup_exit;
914 }
915 bcc_ptr += blob_len;
916 bytes_remaining -= blob_len;
917 }
918
919 /* BB check if Unicode and decode strings */
920 if (bytes_remaining == 0) {
921 /* no string area to decode, do nothing */
922 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
923 /* unicode string area must be word-aligned */
924 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
925 ++bcc_ptr;
926 --bytes_remaining;
927 }
928 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, nls_cp);
929 } else {
930 rc = decode_ascii_ssetup(&bcc_ptr, bytes_remaining,
931 ses, nls_cp);
932 }
933
934ssetup_exit:
935 if (spnego_key) {
936 key_revoke(spnego_key);
937 key_put(spnego_key);
938 }
939 kfree(str_area);
940 kfree(ntlmsspblob);
941 ntlmsspblob = NULL;
942 if (resp_buf_type == CIFS_SMALL_BUFFER) {
943 cFYI(1, "ssetup freeing small buf %p", iov[0].iov_base);
944 cifs_small_buf_release(iov[0].iov_base);
945 } else if (resp_buf_type == CIFS_LARGE_BUFFER)
946 cifs_buf_release(iov[0].iov_base);
947
948 /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
949 if ((phase == NtLmChallenge) && (rc == 0))
950 goto ssetup_ntlmssp_authenticate;
951
952 return rc;
953}