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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[cris-mirror.git] / fs / cifs / sess.c
blob8b0502cd39afb6b27f89b24fdb63e8122f162aee
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 static __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
80 static void
81 unicode_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
103 static 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
126 static 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
158 static 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
163 /* copy user */
164 /* BB what about null user mounts - check that we do this BB */
165 /* copy user */
166 if (ses->user_name != NULL) {
167 strncpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
168 bcc_ptr += strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
169 }
170 /* else null user mount */
171 *bcc_ptr = 0;
172 bcc_ptr++; /* account for null termination */
173
174 /* copy domain */
175 if (ses->domainName != NULL) {
176 strncpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
177 bcc_ptr += strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
178 } /* else we will send a null domain name
179 so the server will default to its own domain */
180 *bcc_ptr = 0;
181 bcc_ptr++;
182
183 /* BB check for overflow here */
184
185 strcpy(bcc_ptr, "Linux version ");
186 bcc_ptr += strlen("Linux version ");
187 strcpy(bcc_ptr, init_utsname()->release);
188 bcc_ptr += strlen(init_utsname()->release) + 1;
189
190 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
191 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
192
193 *pbcc_area = bcc_ptr;
194 }
195
196 static void
197 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
198 const struct nls_table *nls_cp)
199 {
200 int len;
201 char *data = *pbcc_area;
202
203 cifs_dbg(FYI, "bleft %d\n", bleft);
204
205 kfree(ses->serverOS);
206 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
207 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
208 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
209 data += len;
210 bleft -= len;
211 if (bleft <= 0)
212 return;
213
214 kfree(ses->serverNOS);
215 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
216 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
217 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
218 data += len;
219 bleft -= len;
220 if (bleft <= 0)
221 return;
222
223 kfree(ses->serverDomain);
224 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
225 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
226
227 return;
228 }
229
230 static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
231 struct cifs_ses *ses,
232 const struct nls_table *nls_cp)
233 {
234 int len;
235 char *bcc_ptr = *pbcc_area;
236
237 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
238
239 len = strnlen(bcc_ptr, bleft);
240 if (len >= bleft)
241 return;
242
243 kfree(ses->serverOS);
244
245 ses->serverOS = kzalloc(len + 1, GFP_KERNEL);
246 if (ses->serverOS) {
247 strncpy(ses->serverOS, bcc_ptr, len);
248 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
249 cifs_dbg(FYI, "OS/2 server\n");
250 }
251
252 bcc_ptr += len + 1;
253 bleft -= len + 1;
254
255 len = strnlen(bcc_ptr, bleft);
256 if (len >= bleft)
257 return;
258
259 kfree(ses->serverNOS);
260
261 ses->serverNOS = kzalloc(len + 1, GFP_KERNEL);
262 if (ses->serverNOS)
263 strncpy(ses->serverNOS, bcc_ptr, len);
264
265 bcc_ptr += len + 1;
266 bleft -= len + 1;
267
268 len = strnlen(bcc_ptr, bleft);
269 if (len > bleft)
270 return;
271
272 /* No domain field in LANMAN case. Domain is
273 returned by old servers in the SMB negprot response */
274 /* BB For newer servers which do not support Unicode,
275 but thus do return domain here we could add parsing
276 for it later, but it is not very important */
277 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
278 }
279
280 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
281 struct cifs_ses *ses)
282 {
283 unsigned int tioffset; /* challenge message target info area */
284 unsigned int tilen; /* challenge message target info area length */
285
286 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
287
288 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
289 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
290 return -EINVAL;
291 }
292
293 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
294 cifs_dbg(VFS, "blob signature incorrect %s\n",
295 pblob->Signature);
296 return -EINVAL;
297 }
298 if (pblob->MessageType != NtLmChallenge) {
299 cifs_dbg(VFS, "Incorrect message type %d\n",
300 pblob->MessageType);
301 return -EINVAL;
302 }
303
304 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
305 /* BB we could decode pblob->NegotiateFlags; some may be useful */
306 /* In particular we can examine sign flags */
307 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
308 we must set the MIC field of the AUTHENTICATE_MESSAGE */
309 ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags);
310 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
311 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
312 if (tioffset > blob_len || tioffset + tilen > blob_len) {
313 cifs_dbg(VFS, "tioffset + tilen too high %u + %u",
314 tioffset, tilen);
315 return -EINVAL;
316 }
317 if (tilen) {
318 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
319 GFP_KERNEL);
320 if (!ses->auth_key.response) {
321 cifs_dbg(VFS, "Challenge target info alloc failure");
322 return -ENOMEM;
323 }
324 ses->auth_key.len = tilen;
325 }
326
327 return 0;
328 }
329
330 /* BB Move to ntlmssp.c eventually */
331
332 /* We do not malloc the blob, it is passed in pbuffer, because
333 it is fixed size, and small, making this approach cleaner */
334 void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
335 struct cifs_ses *ses)
336 {
337 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer;
338 __u32 flags;
339
340 memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
341 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
342 sec_blob->MessageType = NtLmNegotiate;
343
344 /* BB is NTLMV2 session security format easier to use here? */
345 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
346 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
347 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
348 NTLMSSP_NEGOTIATE_SEAL;
349 if (ses->server->sign)
350 flags |= NTLMSSP_NEGOTIATE_SIGN;
351 if (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
352 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
353
354 sec_blob->NegotiateFlags = cpu_to_le32(flags);
355
356 sec_blob->WorkstationName.BufferOffset = 0;
357 sec_blob->WorkstationName.Length = 0;
358 sec_blob->WorkstationName.MaximumLength = 0;
359
360 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
361 sec_blob->DomainName.BufferOffset = 0;
362 sec_blob->DomainName.Length = 0;
363 sec_blob->DomainName.MaximumLength = 0;
364 }
365
366 static int size_of_ntlmssp_blob(struct cifs_ses *ses)
367 {
368 int sz = sizeof(AUTHENTICATE_MESSAGE) + ses->auth_key.len
369 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
370
371 if (ses->domainName)
372 sz += 2 * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
373 else
374 sz += 2;
375
376 if (ses->user_name)
377 sz += 2 * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
378 else
379 sz += 2;
380
381 return sz;
382 }
383
384 int build_ntlmssp_auth_blob(unsigned char **pbuffer,
385 u16 *buflen,
386 struct cifs_ses *ses,
387 const struct nls_table *nls_cp)
388 {
389 int rc;
390 AUTHENTICATE_MESSAGE *sec_blob;
391 __u32 flags;
392 unsigned char *tmp;
393
394 rc = setup_ntlmv2_rsp(ses, nls_cp);
395 if (rc) {
396 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
397 *buflen = 0;
398 goto setup_ntlmv2_ret;
399 }
400 *pbuffer = kmalloc(size_of_ntlmssp_blob(ses), GFP_KERNEL);
401 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
402
403 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
404 sec_blob->MessageType = NtLmAuthenticate;
405
406 flags = NTLMSSP_NEGOTIATE_56 |
407 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
408 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
409 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
410 NTLMSSP_NEGOTIATE_SEAL;
411 if (ses->server->sign)
412 flags |= NTLMSSP_NEGOTIATE_SIGN;
413 if (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
414 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
415
416 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
417 sec_blob->NegotiateFlags = cpu_to_le32(flags);
418
419 sec_blob->LmChallengeResponse.BufferOffset =
420 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
421 sec_blob->LmChallengeResponse.Length = 0;
422 sec_blob->LmChallengeResponse.MaximumLength = 0;
423
424 sec_blob->NtChallengeResponse.BufferOffset =
425 cpu_to_le32(tmp - *pbuffer);
426 if (ses->user_name != NULL) {
427 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
428 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
429 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
430
431 sec_blob->NtChallengeResponse.Length =
432 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
433 sec_blob->NtChallengeResponse.MaximumLength =
434 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
435 } else {
436 /*
437 * don't send an NT Response for anonymous access
438 */
439 sec_blob->NtChallengeResponse.Length = 0;
440 sec_blob->NtChallengeResponse.MaximumLength = 0;
441 }
442
443 if (ses->domainName == NULL) {
444 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
445 sec_blob->DomainName.Length = 0;
446 sec_blob->DomainName.MaximumLength = 0;
447 tmp += 2;
448 } else {
449 int len;
450 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
451 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
452 len *= 2; /* unicode is 2 bytes each */
453 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
454 sec_blob->DomainName.Length = cpu_to_le16(len);
455 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
456 tmp += len;
457 }
458
459 if (ses->user_name == NULL) {
460 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
461 sec_blob->UserName.Length = 0;
462 sec_blob->UserName.MaximumLength = 0;
463 tmp += 2;
464 } else {
465 int len;
466 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
467 CIFS_MAX_USERNAME_LEN, nls_cp);
468 len *= 2; /* unicode is 2 bytes each */
469 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
470 sec_blob->UserName.Length = cpu_to_le16(len);
471 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
472 tmp += len;
473 }
474
475 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
476 sec_blob->WorkstationName.Length = 0;
477 sec_blob->WorkstationName.MaximumLength = 0;
478 tmp += 2;
479
480 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
481 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
482 && !calc_seckey(ses)) {
483 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
484 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
485 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
486 sec_blob->SessionKey.MaximumLength =
487 cpu_to_le16(CIFS_CPHTXT_SIZE);
488 tmp += CIFS_CPHTXT_SIZE;
489 } else {
490 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
491 sec_blob->SessionKey.Length = 0;
492 sec_blob->SessionKey.MaximumLength = 0;
493 }
494
495 *buflen = tmp - *pbuffer;
496 setup_ntlmv2_ret:
497 return rc;
498 }
499
500 enum securityEnum
501 cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
502 {
503 switch (server->negflavor) {
504 case CIFS_NEGFLAVOR_EXTENDED:
505 switch (requested) {
506 case Kerberos:
507 case RawNTLMSSP:
508 return requested;
509 case Unspecified:
510 if (server->sec_ntlmssp &&
511 (global_secflags & CIFSSEC_MAY_NTLMSSP))
512 return RawNTLMSSP;
513 if ((server->sec_kerberos || server->sec_mskerberos) &&
514 (global_secflags & CIFSSEC_MAY_KRB5))
515 return Kerberos;
516 /* Fallthrough */
517 default:
518 return Unspecified;
519 }
520 case CIFS_NEGFLAVOR_UNENCAP:
521 switch (requested) {
522 case NTLM:
523 case NTLMv2:
524 return requested;
525 case Unspecified:
526 if (global_secflags & CIFSSEC_MAY_NTLMV2)
527 return NTLMv2;
528 if (global_secflags & CIFSSEC_MAY_NTLM)
529 return NTLM;
530 default:
531 /* Fallthrough to attempt LANMAN authentication next */
532 break;
533 }
534 case CIFS_NEGFLAVOR_LANMAN:
535 switch (requested) {
536 case LANMAN:
537 return requested;
538 case Unspecified:
539 if (global_secflags & CIFSSEC_MAY_LANMAN)
540 return LANMAN;
541 /* Fallthrough */
542 default:
543 return Unspecified;
544 }
545 default:
546 return Unspecified;
547 }
548 }
549
550 struct sess_data {
551 unsigned int xid;
552 struct cifs_ses *ses;
553 struct nls_table *nls_cp;
554 void (*func)(struct sess_data *);
555 int result;
556
557 /* we will send the SMB in three pieces:
558 * a fixed length beginning part, an optional
559 * SPNEGO blob (which can be zero length), and a
560 * last part which will include the strings
561 * and rest of bcc area. This allows us to avoid
562 * a large buffer 17K allocation
563 */
564 int buf0_type;
565 struct kvec iov[3];
566 };
567
568 static int
569 sess_alloc_buffer(struct sess_data *sess_data, int wct)
570 {
571 int rc;
572 struct cifs_ses *ses = sess_data->ses;
573 struct smb_hdr *smb_buf;
574
575 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
576 (void **)&smb_buf);
577
578 if (rc)
579 return rc;
580
581 sess_data->iov[0].iov_base = (char *)smb_buf;
582 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
583 /*
584 * This variable will be used to clear the buffer
585 * allocated above in case of any error in the calling function.
586 */
587 sess_data->buf0_type = CIFS_SMALL_BUFFER;
588
589 /* 2000 big enough to fit max user, domain, NOS name etc. */
590 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
591 if (!sess_data->iov[2].iov_base) {
592 rc = -ENOMEM;
593 goto out_free_smb_buf;
594 }
595
596 return 0;
597
598 out_free_smb_buf:
599 kfree(smb_buf);
600 sess_data->iov[0].iov_base = NULL;
601 sess_data->iov[0].iov_len = 0;
602 sess_data->buf0_type = CIFS_NO_BUFFER;
603 return rc;
604 }
605
606 static void
607 sess_free_buffer(struct sess_data *sess_data)
608 {
609
610 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
611 sess_data->buf0_type = CIFS_NO_BUFFER;
612 kfree(sess_data->iov[2].iov_base);
613 }
614
615 static int
616 sess_establish_session(struct sess_data *sess_data)
617 {
618 struct cifs_ses *ses = sess_data->ses;
619
620 mutex_lock(&ses->server->srv_mutex);
621 if (!ses->server->session_estab) {
622 if (ses->server->sign) {
623 ses->server->session_key.response =
624 kmemdup(ses->auth_key.response,
625 ses->auth_key.len, GFP_KERNEL);
626 if (!ses->server->session_key.response) {
627 mutex_unlock(&ses->server->srv_mutex);
628 return -ENOMEM;
629 }
630 ses->server->session_key.len =
631 ses->auth_key.len;
632 }
633 ses->server->sequence_number = 0x2;
634 ses->server->session_estab = true;
635 }
636 mutex_unlock(&ses->server->srv_mutex);
637
638 cifs_dbg(FYI, "CIFS session established successfully\n");
639 spin_lock(&GlobalMid_Lock);
640 ses->status = CifsGood;
641 ses->need_reconnect = false;
642 spin_unlock(&GlobalMid_Lock);
643
644 return 0;
645 }
646
647 static int
648 sess_sendreceive(struct sess_data *sess_data)
649 {
650 int rc;
651 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
652 __u16 count;
653 struct kvec rsp_iov = { NULL, 0 };
654
655 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
656 smb_buf->smb_buf_length =
657 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
658 put_bcc(count, smb_buf);
659
660 rc = SendReceive2(sess_data->xid, sess_data->ses,
661 sess_data->iov, 3 /* num_iovecs */,
662 &sess_data->buf0_type,
663 CIFS_LOG_ERROR, &rsp_iov);
664 cifs_small_buf_release(sess_data->iov[0].iov_base);
665 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
666
667 return rc;
668 }
669
670 /*
671 * LANMAN and plaintext are less secure and off by default.
672 * So we make this explicitly be turned on in kconfig (in the
673 * build) and turned on at runtime (changed from the default)
674 * in proc/fs/cifs or via mount parm. Unfortunately this is
675 * needed for old Win (e.g. Win95), some obscure NAS and OS/2
676 */
677 #ifdef CONFIG_CIFS_WEAK_PW_HASH
678 static void
679 sess_auth_lanman(struct sess_data *sess_data)
680 {
681 int rc = 0;
682 struct smb_hdr *smb_buf;
683 SESSION_SETUP_ANDX *pSMB;
684 char *bcc_ptr;
685 struct cifs_ses *ses = sess_data->ses;
686 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
687 __u32 capabilities;
688 __u16 bytes_remaining;
689
690 /* lanman 2 style sessionsetup */
691 /* wct = 10 */
692 rc = sess_alloc_buffer(sess_data, 10);
693 if (rc)
694 goto out;
695
696 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
697 bcc_ptr = sess_data->iov[2].iov_base;
698 capabilities = cifs_ssetup_hdr(ses, pSMB);
699
700 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
701
702 if (ses->user_name != NULL) {
703 /* no capabilities flags in old lanman negotiation */
704 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
705
706 /* Calculate hash with password and copy into bcc_ptr.
707 * Encryption Key (stored as in cryptkey) gets used if the
708 * security mode bit in Negottiate Protocol response states
709 * to use challenge/response method (i.e. Password bit is 1).
710 */
711 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
712 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
713 true : false, lnm_session_key);
714 if (rc)
715 goto out;
716
717 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
718 bcc_ptr += CIFS_AUTH_RESP_SIZE;
719 } else {
720 pSMB->old_req.PasswordLength = 0;
721 }
722
723 /*
724 * can not sign if LANMAN negotiated so no need
725 * to calculate signing key? but what if server
726 * changed to do higher than lanman dialect and
727 * we reconnected would we ever calc signing_key?
728 */
729
730 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
731 /* Unicode not allowed for LANMAN dialects */
732 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
733
734 sess_data->iov[2].iov_len = (long) bcc_ptr -
735 (long) sess_data->iov[2].iov_base;
736
737 rc = sess_sendreceive(sess_data);
738 if (rc)
739 goto out;
740
741 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
742 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
743
744 /* lanman response has a word count of 3 */
745 if (smb_buf->WordCount != 3) {
746 rc = -EIO;
747 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
748 goto out;
749 }
750
751 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
752 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
753
754 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
755 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
756
757 bytes_remaining = get_bcc(smb_buf);
758 bcc_ptr = pByteArea(smb_buf);
759
760 /* BB check if Unicode and decode strings */
761 if (bytes_remaining == 0) {
762 /* no string area to decode, do nothing */
763 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
764 /* unicode string area must be word-aligned */
765 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
766 ++bcc_ptr;
767 --bytes_remaining;
768 }
769 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
770 sess_data->nls_cp);
771 } else {
772 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
773 sess_data->nls_cp);
774 }
775
776 rc = sess_establish_session(sess_data);
777 out:
778 sess_data->result = rc;
779 sess_data->func = NULL;
780 sess_free_buffer(sess_data);
781 }
782
783 #endif
784
785 static void
786 sess_auth_ntlm(struct sess_data *sess_data)
787 {
788 int rc = 0;
789 struct smb_hdr *smb_buf;
790 SESSION_SETUP_ANDX *pSMB;
791 char *bcc_ptr;
792 struct cifs_ses *ses = sess_data->ses;
793 __u32 capabilities;
794 __u16 bytes_remaining;
795
796 /* old style NTLM sessionsetup */
797 /* wct = 13 */
798 rc = sess_alloc_buffer(sess_data, 13);
799 if (rc)
800 goto out;
801
802 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
803 bcc_ptr = sess_data->iov[2].iov_base;
804 capabilities = cifs_ssetup_hdr(ses, pSMB);
805
806 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
807 if (ses->user_name != NULL) {
808 pSMB->req_no_secext.CaseInsensitivePasswordLength =
809 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
810 pSMB->req_no_secext.CaseSensitivePasswordLength =
811 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
812
813 /* calculate ntlm response and session key */
814 rc = setup_ntlm_response(ses, sess_data->nls_cp);
815 if (rc) {
816 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
817 rc);
818 goto out;
819 }
820
821 /* copy ntlm response */
822 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
823 CIFS_AUTH_RESP_SIZE);
824 bcc_ptr += CIFS_AUTH_RESP_SIZE;
825 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
826 CIFS_AUTH_RESP_SIZE);
827 bcc_ptr += CIFS_AUTH_RESP_SIZE;
828 } else {
829 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
830 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
831 }
832
833 if (ses->capabilities & CAP_UNICODE) {
834 /* unicode strings must be word aligned */
835 if (sess_data->iov[0].iov_len % 2) {
836 *bcc_ptr = 0;
837 bcc_ptr++;
838 }
839 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
840 } else {
841 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
842 }
843
844
845 sess_data->iov[2].iov_len = (long) bcc_ptr -
846 (long) sess_data->iov[2].iov_base;
847
848 rc = sess_sendreceive(sess_data);
849 if (rc)
850 goto out;
851
852 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
853 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
854
855 if (smb_buf->WordCount != 3) {
856 rc = -EIO;
857 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
858 goto out;
859 }
860
861 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
862 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
863
864 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
865 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
866
867 bytes_remaining = get_bcc(smb_buf);
868 bcc_ptr = pByteArea(smb_buf);
869
870 /* BB check if Unicode and decode strings */
871 if (bytes_remaining == 0) {
872 /* no string area to decode, do nothing */
873 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
874 /* unicode string area must be word-aligned */
875 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
876 ++bcc_ptr;
877 --bytes_remaining;
878 }
879 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
880 sess_data->nls_cp);
881 } else {
882 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
883 sess_data->nls_cp);
884 }
885
886 rc = sess_establish_session(sess_data);
887 out:
888 sess_data->result = rc;
889 sess_data->func = NULL;
890 sess_free_buffer(sess_data);
891 kfree(ses->auth_key.response);
892 ses->auth_key.response = NULL;
893 }
894
895 static void
896 sess_auth_ntlmv2(struct sess_data *sess_data)
897 {
898 int rc = 0;
899 struct smb_hdr *smb_buf;
900 SESSION_SETUP_ANDX *pSMB;
901 char *bcc_ptr;
902 struct cifs_ses *ses = sess_data->ses;
903 __u32 capabilities;
904 __u16 bytes_remaining;
905
906 /* old style NTLM sessionsetup */
907 /* wct = 13 */
908 rc = sess_alloc_buffer(sess_data, 13);
909 if (rc)
910 goto out;
911
912 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
913 bcc_ptr = sess_data->iov[2].iov_base;
914 capabilities = cifs_ssetup_hdr(ses, pSMB);
915
916 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
917
918 /* LM2 password would be here if we supported it */
919 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
920
921 if (ses->user_name != NULL) {
922 /* calculate nlmv2 response and session key */
923 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
924 if (rc) {
925 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
926 goto out;
927 }
928
929 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
930 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
931 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
932
933 /* set case sensitive password length after tilen may get
934 * assigned, tilen is 0 otherwise.
935 */
936 pSMB->req_no_secext.CaseSensitivePasswordLength =
937 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
938 } else {
939 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
940 }
941
942 if (ses->capabilities & CAP_UNICODE) {
943 if (sess_data->iov[0].iov_len % 2) {
944 *bcc_ptr = 0;
945 bcc_ptr++;
946 }
947 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
948 } else {
949 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
950 }
951
952
953 sess_data->iov[2].iov_len = (long) bcc_ptr -
954 (long) sess_data->iov[2].iov_base;
955
956 rc = sess_sendreceive(sess_data);
957 if (rc)
958 goto out;
959
960 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
961 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
962
963 if (smb_buf->WordCount != 3) {
964 rc = -EIO;
965 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
966 goto out;
967 }
968
969 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
970 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
971
972 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
973 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
974
975 bytes_remaining = get_bcc(smb_buf);
976 bcc_ptr = pByteArea(smb_buf);
977
978 /* BB check if Unicode and decode strings */
979 if (bytes_remaining == 0) {
980 /* no string area to decode, do nothing */
981 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
982 /* unicode string area must be word-aligned */
983 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
984 ++bcc_ptr;
985 --bytes_remaining;
986 }
987 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
988 sess_data->nls_cp);
989 } else {
990 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
991 sess_data->nls_cp);
992 }
993
994 rc = sess_establish_session(sess_data);
995 out:
996 sess_data->result = rc;
997 sess_data->func = NULL;
998 sess_free_buffer(sess_data);
999 kfree(ses->auth_key.response);
1000 ses->auth_key.response = NULL;
1001 }
1002
1003 #ifdef CONFIG_CIFS_UPCALL
1004 static void
1005 sess_auth_kerberos(struct sess_data *sess_data)
1006 {
1007 int rc = 0;
1008 struct smb_hdr *smb_buf;
1009 SESSION_SETUP_ANDX *pSMB;
1010 char *bcc_ptr;
1011 struct cifs_ses *ses = sess_data->ses;
1012 __u32 capabilities;
1013 __u16 bytes_remaining;
1014 struct key *spnego_key = NULL;
1015 struct cifs_spnego_msg *msg;
1016 u16 blob_len;
1017
1018 /* extended security */
1019 /* wct = 12 */
1020 rc = sess_alloc_buffer(sess_data, 12);
1021 if (rc)
1022 goto out;
1023
1024 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1025 bcc_ptr = sess_data->iov[2].iov_base;
1026 capabilities = cifs_ssetup_hdr(ses, pSMB);
1027
1028 spnego_key = cifs_get_spnego_key(ses);
1029 if (IS_ERR(spnego_key)) {
1030 rc = PTR_ERR(spnego_key);
1031 spnego_key = NULL;
1032 goto out;
1033 }
1034
1035 msg = spnego_key->payload.data[0];
1036 /*
1037 * check version field to make sure that cifs.upcall is
1038 * sending us a response in an expected form
1039 */
1040 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1041 cifs_dbg(VFS,
1042 "incorrect version of cifs.upcall (expected %d but got %d)",
1043 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1044 rc = -EKEYREJECTED;
1045 goto out_put_spnego_key;
1046 }
1047
1048 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1049 GFP_KERNEL);
1050 if (!ses->auth_key.response) {
1051 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory",
1052 msg->sesskey_len);
1053 rc = -ENOMEM;
1054 goto out_put_spnego_key;
1055 }
1056 ses->auth_key.len = msg->sesskey_len;
1057
1058 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1059 capabilities |= CAP_EXTENDED_SECURITY;
1060 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1061 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1062 sess_data->iov[1].iov_len = msg->secblob_len;
1063 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1064
1065 if (ses->capabilities & CAP_UNICODE) {
1066 /* unicode strings must be word aligned */
1067 if ((sess_data->iov[0].iov_len
1068 + sess_data->iov[1].iov_len) % 2) {
1069 *bcc_ptr = 0;
1070 bcc_ptr++;
1071 }
1072 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1073 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1074 } else {
1075 /* BB: is this right? */
1076 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1077 }
1078
1079 sess_data->iov[2].iov_len = (long) bcc_ptr -
1080 (long) sess_data->iov[2].iov_base;
1081
1082 rc = sess_sendreceive(sess_data);
1083 if (rc)
1084 goto out_put_spnego_key;
1085
1086 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1087 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1088
1089 if (smb_buf->WordCount != 4) {
1090 rc = -EIO;
1091 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1092 goto out_put_spnego_key;
1093 }
1094
1095 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1096 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1097
1098 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1099 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1100
1101 bytes_remaining = get_bcc(smb_buf);
1102 bcc_ptr = pByteArea(smb_buf);
1103
1104 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1105 if (blob_len > bytes_remaining) {
1106 cifs_dbg(VFS, "bad security blob length %d\n",
1107 blob_len);
1108 rc = -EINVAL;
1109 goto out_put_spnego_key;
1110 }
1111 bcc_ptr += blob_len;
1112 bytes_remaining -= blob_len;
1113
1114 /* BB check if Unicode and decode strings */
1115 if (bytes_remaining == 0) {
1116 /* no string area to decode, do nothing */
1117 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1118 /* unicode string area must be word-aligned */
1119 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1120 ++bcc_ptr;
1121 --bytes_remaining;
1122 }
1123 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1124 sess_data->nls_cp);
1125 } else {
1126 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1127 sess_data->nls_cp);
1128 }
1129
1130 rc = sess_establish_session(sess_data);
1131 out_put_spnego_key:
1132 key_invalidate(spnego_key);
1133 key_put(spnego_key);
1134 out:
1135 sess_data->result = rc;
1136 sess_data->func = NULL;
1137 sess_free_buffer(sess_data);
1138 kfree(ses->auth_key.response);
1139 ses->auth_key.response = NULL;
1140 }
1141
1142 #endif /* ! CONFIG_CIFS_UPCALL */
1143
1144 /*
1145 * The required kvec buffers have to be allocated before calling this
1146 * function.
1147 */
1148 static int
1149 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1150 {
1151 struct smb_hdr *smb_buf;
1152 SESSION_SETUP_ANDX *pSMB;
1153 struct cifs_ses *ses = sess_data->ses;
1154 __u32 capabilities;
1155 char *bcc_ptr;
1156
1157 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1158 smb_buf = (struct smb_hdr *)pSMB;
1159
1160 capabilities = cifs_ssetup_hdr(ses, pSMB);
1161 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1162 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1163 return -ENOSYS;
1164 }
1165
1166 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1167 capabilities |= CAP_EXTENDED_SECURITY;
1168 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1169
1170 bcc_ptr = sess_data->iov[2].iov_base;
1171 /* unicode strings must be word aligned */
1172 if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1173 *bcc_ptr = 0;
1174 bcc_ptr++;
1175 }
1176 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1177
1178 sess_data->iov[2].iov_len = (long) bcc_ptr -
1179 (long) sess_data->iov[2].iov_base;
1180
1181 return 0;
1182 }
1183
1184 static void
1185 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1186
1187 static void
1188 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1189 {
1190 int rc;
1191 struct smb_hdr *smb_buf;
1192 SESSION_SETUP_ANDX *pSMB;
1193 struct cifs_ses *ses = sess_data->ses;
1194 __u16 bytes_remaining;
1195 char *bcc_ptr;
1196 u16 blob_len;
1197
1198 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1199
1200 /*
1201 * if memory allocation is successful, caller of this function
1202 * frees it.
1203 */
1204 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1205 if (!ses->ntlmssp) {
1206 rc = -ENOMEM;
1207 goto out;
1208 }
1209 ses->ntlmssp->sesskey_per_smbsess = false;
1210
1211 /* wct = 12 */
1212 rc = sess_alloc_buffer(sess_data, 12);
1213 if (rc)
1214 goto out;
1215
1216 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1217
1218 /* Build security blob before we assemble the request */
1219 build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
1220 sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
1221 sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
1222 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
1223
1224 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1225 if (rc)
1226 goto out;
1227
1228 rc = sess_sendreceive(sess_data);
1229
1230 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1231 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1232
1233 /* If true, rc here is expected and not an error */
1234 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1235 smb_buf->Status.CifsError ==
1236 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1237 rc = 0;
1238
1239 if (rc)
1240 goto out;
1241
1242 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1243
1244 if (smb_buf->WordCount != 4) {
1245 rc = -EIO;
1246 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1247 goto out;
1248 }
1249
1250 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1251 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1252
1253 bytes_remaining = get_bcc(smb_buf);
1254 bcc_ptr = pByteArea(smb_buf);
1255
1256 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1257 if (blob_len > bytes_remaining) {
1258 cifs_dbg(VFS, "bad security blob length %d\n",
1259 blob_len);
1260 rc = -EINVAL;
1261 goto out;
1262 }
1263
1264 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1265 out:
1266 sess_free_buffer(sess_data);
1267
1268 if (!rc) {
1269 sess_data->func = sess_auth_rawntlmssp_authenticate;
1270 return;
1271 }
1272
1273 /* Else error. Cleanup */
1274 kfree(ses->auth_key.response);
1275 ses->auth_key.response = NULL;
1276 kfree(ses->ntlmssp);
1277 ses->ntlmssp = NULL;
1278
1279 sess_data->func = NULL;
1280 sess_data->result = rc;
1281 }
1282
1283 static void
1284 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1285 {
1286 int rc;
1287 struct smb_hdr *smb_buf;
1288 SESSION_SETUP_ANDX *pSMB;
1289 struct cifs_ses *ses = sess_data->ses;
1290 __u16 bytes_remaining;
1291 char *bcc_ptr;
1292 unsigned char *ntlmsspblob = NULL;
1293 u16 blob_len;
1294
1295 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1296
1297 /* wct = 12 */
1298 rc = sess_alloc_buffer(sess_data, 12);
1299 if (rc)
1300 goto out;
1301
1302 /* Build security blob before we assemble the request */
1303 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1304 smb_buf = (struct smb_hdr *)pSMB;
1305 rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1306 &blob_len, ses, sess_data->nls_cp);
1307 if (rc)
1308 goto out_free_ntlmsspblob;
1309 sess_data->iov[1].iov_len = blob_len;
1310 sess_data->iov[1].iov_base = ntlmsspblob;
1311 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1312 /*
1313 * Make sure that we tell the server that we are using
1314 * the uid that it just gave us back on the response
1315 * (challenge)
1316 */
1317 smb_buf->Uid = ses->Suid;
1318
1319 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1320 if (rc)
1321 goto out_free_ntlmsspblob;
1322
1323 rc = sess_sendreceive(sess_data);
1324 if (rc)
1325 goto out_free_ntlmsspblob;
1326
1327 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1328 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1329 if (smb_buf->WordCount != 4) {
1330 rc = -EIO;
1331 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1332 goto out_free_ntlmsspblob;
1333 }
1334
1335 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1336 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1337
1338 if (ses->Suid != smb_buf->Uid) {
1339 ses->Suid = smb_buf->Uid;
1340 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1341 }
1342
1343 bytes_remaining = get_bcc(smb_buf);
1344 bcc_ptr = pByteArea(smb_buf);
1345 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1346 if (blob_len > bytes_remaining) {
1347 cifs_dbg(VFS, "bad security blob length %d\n",
1348 blob_len);
1349 rc = -EINVAL;
1350 goto out_free_ntlmsspblob;
1351 }
1352 bcc_ptr += blob_len;
1353 bytes_remaining -= blob_len;
1354
1355
1356 /* BB check if Unicode and decode strings */
1357 if (bytes_remaining == 0) {
1358 /* no string area to decode, do nothing */
1359 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1360 /* unicode string area must be word-aligned */
1361 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1362 ++bcc_ptr;
1363 --bytes_remaining;
1364 }
1365 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1366 sess_data->nls_cp);
1367 } else {
1368 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1369 sess_data->nls_cp);
1370 }
1371
1372 out_free_ntlmsspblob:
1373 kfree(ntlmsspblob);
1374 out:
1375 sess_free_buffer(sess_data);
1376
1377 if (!rc)
1378 rc = sess_establish_session(sess_data);
1379
1380 /* Cleanup */
1381 kfree(ses->auth_key.response);
1382 ses->auth_key.response = NULL;
1383 kfree(ses->ntlmssp);
1384 ses->ntlmssp = NULL;
1385
1386 sess_data->func = NULL;
1387 sess_data->result = rc;
1388 }
1389
1390 static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
1391 {
1392 int type;
1393
1394 type = cifs_select_sectype(ses->server, ses->sectype);
1395 cifs_dbg(FYI, "sess setup type %d\n", type);
1396 if (type == Unspecified) {
1397 cifs_dbg(VFS,
1398 "Unable to select appropriate authentication method!");
1399 return -EINVAL;
1400 }
1401
1402 switch (type) {
1403 case LANMAN:
1404 /* LANMAN and plaintext are less secure and off by default.
1405 * So we make this explicitly be turned on in kconfig (in the
1406 * build) and turned on at runtime (changed from the default)
1407 * in proc/fs/cifs or via mount parm. Unfortunately this is
1408 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
1409 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1410 sess_data->func = sess_auth_lanman;
1411 break;
1412 #else
1413 return -EOPNOTSUPP;
1414 #endif
1415 case NTLM:
1416 sess_data->func = sess_auth_ntlm;
1417 break;
1418 case NTLMv2:
1419 sess_data->func = sess_auth_ntlmv2;
1420 break;
1421 case Kerberos:
1422 #ifdef CONFIG_CIFS_UPCALL
1423 sess_data->func = sess_auth_kerberos;
1424 break;
1425 #else
1426 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1427 return -ENOSYS;
1428 break;
1429 #endif /* CONFIG_CIFS_UPCALL */
1430 case RawNTLMSSP:
1431 sess_data->func = sess_auth_rawntlmssp_negotiate;
1432 break;
1433 default:
1434 cifs_dbg(VFS, "secType %d not supported!\n", type);
1435 return -ENOSYS;
1436 }
1437
1438 return 0;
1439 }
1440
1441 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1442 const struct nls_table *nls_cp)
1443 {
1444 int rc = 0;
1445 struct sess_data *sess_data;
1446
1447 if (ses == NULL) {
1448 WARN(1, "%s: ses == NULL!", __func__);
1449 return -EINVAL;
1450 }
1451
1452 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1453 if (!sess_data)
1454 return -ENOMEM;
1455
1456 rc = select_sec(ses, sess_data);
1457 if (rc)
1458 goto out;
1459
1460 sess_data->xid = xid;
1461 sess_data->ses = ses;
1462 sess_data->buf0_type = CIFS_NO_BUFFER;
1463 sess_data->nls_cp = (struct nls_table *) nls_cp;
1464
1465 while (sess_data->func)
1466 sess_data->func(sess_data);
1467
1468 /* Store result before we free sess_data */
1469 rc = sess_data->result;
1470
1471 out:
1472 kfree(sess_data);
1473 return rc;
1474 }
CRIS linux kernel tree