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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
[deliverable/linux.git] / fs / cifs / sess.c
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 = __constant_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 bcc_ptr += len + 1;
252 bleft -= len + 1;
253
254 len = strnlen(bcc_ptr, bleft);
255 if (len >= bleft)
256 return;
257
258 kfree(ses->serverNOS);
259
260 ses->serverNOS = kzalloc(len + 1, GFP_KERNEL);
261 if (ses->serverNOS)
262 strncpy(ses->serverNOS, bcc_ptr, len);
263
264 bcc_ptr += len + 1;
265 bleft -= len + 1;
266
267 len = strnlen(bcc_ptr, bleft);
268 if (len > bleft)
269 return;
270
271 /* No domain field in LANMAN case. Domain is
272 returned by old servers in the SMB negprot response */
273 /* BB For newer servers which do not support Unicode,
274 but thus do return domain here we could add parsing
275 for it later, but it is not very important */
276 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
277 }
278
279 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
280 struct cifs_ses *ses)
281 {
282 unsigned int tioffset; /* challenge message target info area */
283 unsigned int tilen; /* challenge message target info area length */
284
285 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
286
287 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
288 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
289 return -EINVAL;
290 }
291
292 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
293 cifs_dbg(VFS, "blob signature incorrect %s\n",
294 pblob->Signature);
295 return -EINVAL;
296 }
297 if (pblob->MessageType != NtLmChallenge) {
298 cifs_dbg(VFS, "Incorrect message type %d\n",
299 pblob->MessageType);
300 return -EINVAL;
301 }
302
303 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
304 /* BB we could decode pblob->NegotiateFlags; some may be useful */
305 /* In particular we can examine sign flags */
306 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
307 we must set the MIC field of the AUTHENTICATE_MESSAGE */
308 ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags);
309 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
310 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
311 if (tioffset > blob_len || tioffset + tilen > blob_len) {
312 cifs_dbg(VFS, "tioffset + tilen too high %u + %u",
313 tioffset, tilen);
314 return -EINVAL;
315 }
316 if (tilen) {
317 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
318 GFP_KERNEL);
319 if (!ses->auth_key.response) {
320 cifs_dbg(VFS, "Challenge target info alloc failure");
321 return -ENOMEM;
322 }
323 ses->auth_key.len = tilen;
324 }
325
326 return 0;
327 }
328
329 /* BB Move to ntlmssp.c eventually */
330
331 /* We do not malloc the blob, it is passed in pbuffer, because
332 it is fixed size, and small, making this approach cleaner */
333 void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
334 struct cifs_ses *ses)
335 {
336 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer;
337 __u32 flags;
338
339 memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
340 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
341 sec_blob->MessageType = NtLmNegotiate;
342
343 /* BB is NTLMV2 session security format easier to use here? */
344 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
345 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
346 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
347 if (ses->server->sign) {
348 flags |= NTLMSSP_NEGOTIATE_SIGN;
349 if (!ses->server->session_estab ||
350 ses->ntlmssp->sesskey_per_smbsess)
351 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
352 }
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 /* We do not malloc the blob, it is passed in pbuffer, because its
367 maximum possible size is fixed and small, making this approach cleaner.
368 This function returns the length of the data in the blob */
369 int build_ntlmssp_auth_blob(unsigned char *pbuffer,
370 u16 *buflen,
371 struct cifs_ses *ses,
372 const struct nls_table *nls_cp)
373 {
374 int rc;
375 AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer;
376 __u32 flags;
377 unsigned char *tmp;
378
379 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
380 sec_blob->MessageType = NtLmAuthenticate;
381
382 flags = NTLMSSP_NEGOTIATE_56 |
383 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
384 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
385 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
386 if (ses->server->sign) {
387 flags |= NTLMSSP_NEGOTIATE_SIGN;
388 if (!ses->server->session_estab ||
389 ses->ntlmssp->sesskey_per_smbsess)
390 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
391 }
392
393 tmp = pbuffer + sizeof(AUTHENTICATE_MESSAGE);
394 sec_blob->NegotiateFlags = cpu_to_le32(flags);
395
396 sec_blob->LmChallengeResponse.BufferOffset =
397 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
398 sec_blob->LmChallengeResponse.Length = 0;
399 sec_blob->LmChallengeResponse.MaximumLength = 0;
400
401 sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer);
402 rc = setup_ntlmv2_rsp(ses, nls_cp);
403 if (rc) {
404 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
405 goto setup_ntlmv2_ret;
406 }
407 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
408 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
409 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
410
411 sec_blob->NtChallengeResponse.Length =
412 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
413 sec_blob->NtChallengeResponse.MaximumLength =
414 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
415
416 if (ses->domainName == NULL) {
417 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
418 sec_blob->DomainName.Length = 0;
419 sec_blob->DomainName.MaximumLength = 0;
420 tmp += 2;
421 } else {
422 int len;
423 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
424 CIFS_MAX_USERNAME_LEN, nls_cp);
425 len *= 2; /* unicode is 2 bytes each */
426 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
427 sec_blob->DomainName.Length = cpu_to_le16(len);
428 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
429 tmp += len;
430 }
431
432 if (ses->user_name == NULL) {
433 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
434 sec_blob->UserName.Length = 0;
435 sec_blob->UserName.MaximumLength = 0;
436 tmp += 2;
437 } else {
438 int len;
439 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
440 CIFS_MAX_USERNAME_LEN, nls_cp);
441 len *= 2; /* unicode is 2 bytes each */
442 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
443 sec_blob->UserName.Length = cpu_to_le16(len);
444 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
445 tmp += len;
446 }
447
448 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - pbuffer);
449 sec_blob->WorkstationName.Length = 0;
450 sec_blob->WorkstationName.MaximumLength = 0;
451 tmp += 2;
452
453 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
454 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
455 && !calc_seckey(ses)) {
456 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
457 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
458 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
459 sec_blob->SessionKey.MaximumLength =
460 cpu_to_le16(CIFS_CPHTXT_SIZE);
461 tmp += CIFS_CPHTXT_SIZE;
462 } else {
463 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
464 sec_blob->SessionKey.Length = 0;
465 sec_blob->SessionKey.MaximumLength = 0;
466 }
467
468 setup_ntlmv2_ret:
469 *buflen = tmp - pbuffer;
470 return rc;
471 }
472
473 enum securityEnum
474 select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
475 {
476 switch (server->negflavor) {
477 case CIFS_NEGFLAVOR_EXTENDED:
478 switch (requested) {
479 case Kerberos:
480 case RawNTLMSSP:
481 return requested;
482 case Unspecified:
483 if (server->sec_ntlmssp &&
484 (global_secflags & CIFSSEC_MAY_NTLMSSP))
485 return RawNTLMSSP;
486 if ((server->sec_kerberos || server->sec_mskerberos) &&
487 (global_secflags & CIFSSEC_MAY_KRB5))
488 return Kerberos;
489 /* Fallthrough */
490 default:
491 return Unspecified;
492 }
493 case CIFS_NEGFLAVOR_UNENCAP:
494 switch (requested) {
495 case NTLM:
496 case NTLMv2:
497 return requested;
498 case Unspecified:
499 if (global_secflags & CIFSSEC_MAY_NTLMV2)
500 return NTLMv2;
501 if (global_secflags & CIFSSEC_MAY_NTLM)
502 return NTLM;
503 default:
504 /* Fallthrough to attempt LANMAN authentication next */
505 break;
506 }
507 case CIFS_NEGFLAVOR_LANMAN:
508 switch (requested) {
509 case LANMAN:
510 return requested;
511 case Unspecified:
512 if (global_secflags & CIFSSEC_MAY_LANMAN)
513 return LANMAN;
514 /* Fallthrough */
515 default:
516 return Unspecified;
517 }
518 default:
519 return Unspecified;
520 }
521 }
522
523 struct sess_data {
524 unsigned int xid;
525 struct cifs_ses *ses;
526 struct nls_table *nls_cp;
527 void (*func)(struct sess_data *);
528 int result;
529
530 /* we will send the SMB in three pieces:
531 * a fixed length beginning part, an optional
532 * SPNEGO blob (which can be zero length), and a
533 * last part which will include the strings
534 * and rest of bcc area. This allows us to avoid
535 * a large buffer 17K allocation
536 */
537 int buf0_type;
538 struct kvec iov[3];
539 };
540
541 static int
542 sess_alloc_buffer(struct sess_data *sess_data, int wct)
543 {
544 int rc;
545 struct cifs_ses *ses = sess_data->ses;
546 struct smb_hdr *smb_buf;
547
548 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
549 (void **)&smb_buf);
550
551 if (rc)
552 return rc;
553
554 sess_data->iov[0].iov_base = (char *)smb_buf;
555 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
556 /*
557 * This variable will be used to clear the buffer
558 * allocated above in case of any error in the calling function.
559 */
560 sess_data->buf0_type = CIFS_SMALL_BUFFER;
561
562 /* 2000 big enough to fit max user, domain, NOS name etc. */
563 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
564 if (!sess_data->iov[2].iov_base) {
565 rc = -ENOMEM;
566 goto out_free_smb_buf;
567 }
568
569 return 0;
570
571 out_free_smb_buf:
572 kfree(smb_buf);
573 sess_data->iov[0].iov_base = NULL;
574 sess_data->iov[0].iov_len = 0;
575 sess_data->buf0_type = CIFS_NO_BUFFER;
576 return rc;
577 }
578
579 static void
580 sess_free_buffer(struct sess_data *sess_data)
581 {
582
583 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
584 sess_data->buf0_type = CIFS_NO_BUFFER;
585 kfree(sess_data->iov[2].iov_base);
586 }
587
588 static int
589 sess_establish_session(struct sess_data *sess_data)
590 {
591 struct cifs_ses *ses = sess_data->ses;
592
593 mutex_lock(&ses->server->srv_mutex);
594 if (!ses->server->session_estab) {
595 if (ses->server->sign) {
596 ses->server->session_key.response =
597 kmemdup(ses->auth_key.response,
598 ses->auth_key.len, GFP_KERNEL);
599 if (!ses->server->session_key.response) {
600 mutex_unlock(&ses->server->srv_mutex);
601 return -ENOMEM;
602 }
603 ses->server->session_key.len =
604 ses->auth_key.len;
605 }
606 ses->server->sequence_number = 0x2;
607 ses->server->session_estab = true;
608 }
609 mutex_unlock(&ses->server->srv_mutex);
610
611 cifs_dbg(FYI, "CIFS session established successfully\n");
612 spin_lock(&GlobalMid_Lock);
613 ses->status = CifsGood;
614 ses->need_reconnect = false;
615 spin_unlock(&GlobalMid_Lock);
616
617 return 0;
618 }
619
620 static int
621 sess_sendreceive(struct sess_data *sess_data)
622 {
623 int rc;
624 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
625 __u16 count;
626
627 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
628 smb_buf->smb_buf_length =
629 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
630 put_bcc(count, smb_buf);
631
632 rc = SendReceive2(sess_data->xid, sess_data->ses,
633 sess_data->iov, 3 /* num_iovecs */,
634 &sess_data->buf0_type,
635 CIFS_LOG_ERROR);
636
637 return rc;
638 }
639
640 /*
641 * LANMAN and plaintext are less secure and off by default.
642 * So we make this explicitly be turned on in kconfig (in the
643 * build) and turned on at runtime (changed from the default)
644 * in proc/fs/cifs or via mount parm. Unfortunately this is
645 * needed for old Win (e.g. Win95), some obscure NAS and OS/2
646 */
647 #ifdef CONFIG_CIFS_WEAK_PW_HASH
648 static void
649 sess_auth_lanman(struct sess_data *sess_data)
650 {
651 int rc = 0;
652 struct smb_hdr *smb_buf;
653 SESSION_SETUP_ANDX *pSMB;
654 char *bcc_ptr;
655 struct cifs_ses *ses = sess_data->ses;
656 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
657 __u32 capabilities;
658 __u16 bytes_remaining;
659
660 /* lanman 2 style sessionsetup */
661 /* wct = 10 */
662 rc = sess_alloc_buffer(sess_data, 10);
663 if (rc)
664 goto out;
665
666 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
667 bcc_ptr = sess_data->iov[2].iov_base;
668 capabilities = cifs_ssetup_hdr(ses, pSMB);
669
670 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
671
672 /* no capabilities flags in old lanman negotiation */
673 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
674
675 /* Calculate hash with password and copy into bcc_ptr.
676 * Encryption Key (stored as in cryptkey) gets used if the
677 * security mode bit in Negottiate Protocol response states
678 * to use challenge/response method (i.e. Password bit is 1).
679 */
680 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
681 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
682 true : false, lnm_session_key);
683
684 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
685 bcc_ptr += CIFS_AUTH_RESP_SIZE;
686
687 /*
688 * can not sign if LANMAN negotiated so no need
689 * to calculate signing key? but what if server
690 * changed to do higher than lanman dialect and
691 * we reconnected would we ever calc signing_key?
692 */
693
694 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
695 /* Unicode not allowed for LANMAN dialects */
696 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
697
698 sess_data->iov[2].iov_len = (long) bcc_ptr -
699 (long) sess_data->iov[2].iov_base;
700
701 rc = sess_sendreceive(sess_data);
702 if (rc)
703 goto out;
704
705 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
706 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
707
708 /* lanman response has a word count of 3 */
709 if (smb_buf->WordCount != 3) {
710 rc = -EIO;
711 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
712 goto out;
713 }
714
715 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
716 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
717
718 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
719 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
720
721 bytes_remaining = get_bcc(smb_buf);
722 bcc_ptr = pByteArea(smb_buf);
723
724 /* BB check if Unicode and decode strings */
725 if (bytes_remaining == 0) {
726 /* no string area to decode, do nothing */
727 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
728 /* unicode string area must be word-aligned */
729 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
730 ++bcc_ptr;
731 --bytes_remaining;
732 }
733 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
734 sess_data->nls_cp);
735 } else {
736 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
737 sess_data->nls_cp);
738 }
739
740 rc = sess_establish_session(sess_data);
741 out:
742 sess_data->result = rc;
743 sess_data->func = NULL;
744 sess_free_buffer(sess_data);
745 }
746
747 #else
748
749 static void
750 sess_auth_lanman(struct sess_data *sess_data)
751 {
752 sess_data->result = -EOPNOTSUPP;
753 sess_data->func = NULL;
754 }
755 #endif
756
757 static void
758 sess_auth_ntlm(struct sess_data *sess_data)
759 {
760 int rc = 0;
761 struct smb_hdr *smb_buf;
762 SESSION_SETUP_ANDX *pSMB;
763 char *bcc_ptr;
764 struct cifs_ses *ses = sess_data->ses;
765 __u32 capabilities;
766 __u16 bytes_remaining;
767
768 /* old style NTLM sessionsetup */
769 /* wct = 13 */
770 rc = sess_alloc_buffer(sess_data, 13);
771 if (rc)
772 goto out;
773
774 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
775 bcc_ptr = sess_data->iov[2].iov_base;
776 capabilities = cifs_ssetup_hdr(ses, pSMB);
777
778 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
779 pSMB->req_no_secext.CaseInsensitivePasswordLength =
780 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
781 pSMB->req_no_secext.CaseSensitivePasswordLength =
782 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
783
784 /* calculate ntlm response and session key */
785 rc = setup_ntlm_response(ses, sess_data->nls_cp);
786 if (rc) {
787 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
788 rc);
789 goto out;
790 }
791
792 /* copy ntlm response */
793 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
794 CIFS_AUTH_RESP_SIZE);
795 bcc_ptr += CIFS_AUTH_RESP_SIZE;
796 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
797 CIFS_AUTH_RESP_SIZE);
798 bcc_ptr += CIFS_AUTH_RESP_SIZE;
799
800 if (ses->capabilities & CAP_UNICODE) {
801 /* unicode strings must be word aligned */
802 if (sess_data->iov[0].iov_len % 2) {
803 *bcc_ptr = 0;
804 bcc_ptr++;
805 }
806 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
807 } else {
808 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
809 }
810
811
812 sess_data->iov[2].iov_len = (long) bcc_ptr -
813 (long) sess_data->iov[2].iov_base;
814
815 rc = sess_sendreceive(sess_data);
816 if (rc)
817 goto out;
818
819 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
820 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
821
822 if (smb_buf->WordCount != 3) {
823 rc = -EIO;
824 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
825 goto out;
826 }
827
828 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
829 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
830
831 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
832 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
833
834 bytes_remaining = get_bcc(smb_buf);
835 bcc_ptr = pByteArea(smb_buf);
836
837 /* BB check if Unicode and decode strings */
838 if (bytes_remaining == 0) {
839 /* no string area to decode, do nothing */
840 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
841 /* unicode string area must be word-aligned */
842 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
843 ++bcc_ptr;
844 --bytes_remaining;
845 }
846 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
847 sess_data->nls_cp);
848 } else {
849 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
850 sess_data->nls_cp);
851 }
852
853 rc = sess_establish_session(sess_data);
854 out:
855 sess_data->result = rc;
856 sess_data->func = NULL;
857 sess_free_buffer(sess_data);
858 kfree(ses->auth_key.response);
859 ses->auth_key.response = NULL;
860 }
861
862 static void
863 sess_auth_ntlmv2(struct sess_data *sess_data)
864 {
865 int rc = 0;
866 struct smb_hdr *smb_buf;
867 SESSION_SETUP_ANDX *pSMB;
868 char *bcc_ptr;
869 struct cifs_ses *ses = sess_data->ses;
870 __u32 capabilities;
871 __u16 bytes_remaining;
872
873 /* old style NTLM sessionsetup */
874 /* wct = 13 */
875 rc = sess_alloc_buffer(sess_data, 13);
876 if (rc)
877 goto out;
878
879 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
880 bcc_ptr = sess_data->iov[2].iov_base;
881 capabilities = cifs_ssetup_hdr(ses, pSMB);
882
883 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
884
885 /* LM2 password would be here if we supported it */
886 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
887
888 /* calculate nlmv2 response and session key */
889 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
890 if (rc) {
891 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
892 goto out;
893 }
894
895 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
896 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
897 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
898
899 /* set case sensitive password length after tilen may get
900 * assigned, tilen is 0 otherwise.
901 */
902 pSMB->req_no_secext.CaseSensitivePasswordLength =
903 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
904
905 if (ses->capabilities & CAP_UNICODE) {
906 if (sess_data->iov[0].iov_len % 2) {
907 *bcc_ptr = 0;
908 bcc_ptr++;
909 }
910 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
911 } else {
912 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
913 }
914
915
916 sess_data->iov[2].iov_len = (long) bcc_ptr -
917 (long) sess_data->iov[2].iov_base;
918
919 rc = sess_sendreceive(sess_data);
920 if (rc)
921 goto out;
922
923 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
924 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
925
926 if (smb_buf->WordCount != 3) {
927 rc = -EIO;
928 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
929 goto out;
930 }
931
932 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
933 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
934
935 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
936 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
937
938 bytes_remaining = get_bcc(smb_buf);
939 bcc_ptr = pByteArea(smb_buf);
940
941 /* BB check if Unicode and decode strings */
942 if (bytes_remaining == 0) {
943 /* no string area to decode, do nothing */
944 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
945 /* unicode string area must be word-aligned */
946 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
947 ++bcc_ptr;
948 --bytes_remaining;
949 }
950 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
951 sess_data->nls_cp);
952 } else {
953 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
954 sess_data->nls_cp);
955 }
956
957 rc = sess_establish_session(sess_data);
958 out:
959 sess_data->result = rc;
960 sess_data->func = NULL;
961 sess_free_buffer(sess_data);
962 kfree(ses->auth_key.response);
963 ses->auth_key.response = NULL;
964 }
965
966 #ifdef CONFIG_CIFS_UPCALL
967 static void
968 sess_auth_kerberos(struct sess_data *sess_data)
969 {
970 int rc = 0;
971 struct smb_hdr *smb_buf;
972 SESSION_SETUP_ANDX *pSMB;
973 char *bcc_ptr;
974 struct cifs_ses *ses = sess_data->ses;
975 __u32 capabilities;
976 __u16 bytes_remaining;
977 struct key *spnego_key = NULL;
978 struct cifs_spnego_msg *msg;
979 u16 blob_len;
980
981 /* extended security */
982 /* wct = 12 */
983 rc = sess_alloc_buffer(sess_data, 12);
984 if (rc)
985 goto out;
986
987 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
988 bcc_ptr = sess_data->iov[2].iov_base;
989 capabilities = cifs_ssetup_hdr(ses, pSMB);
990
991 spnego_key = cifs_get_spnego_key(ses);
992 if (IS_ERR(spnego_key)) {
993 rc = PTR_ERR(spnego_key);
994 spnego_key = NULL;
995 goto out;
996 }
997
998 msg = spnego_key->payload.data;
999 /*
1000 * check version field to make sure that cifs.upcall is
1001 * sending us a response in an expected form
1002 */
1003 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1004 cifs_dbg(VFS,
1005 "incorrect version of cifs.upcall (expected %d but got %d)",
1006 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1007 rc = -EKEYREJECTED;
1008 goto out_put_spnego_key;
1009 }
1010
1011 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1012 GFP_KERNEL);
1013 if (!ses->auth_key.response) {
1014 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory",
1015 msg->sesskey_len);
1016 rc = -ENOMEM;
1017 goto out_put_spnego_key;
1018 }
1019 ses->auth_key.len = msg->sesskey_len;
1020
1021 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1022 capabilities |= CAP_EXTENDED_SECURITY;
1023 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1024 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1025 sess_data->iov[1].iov_len = msg->secblob_len;
1026 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1027
1028 if (ses->capabilities & CAP_UNICODE) {
1029 /* unicode strings must be word aligned */
1030 if ((sess_data->iov[0].iov_len
1031 + sess_data->iov[1].iov_len) % 2) {
1032 *bcc_ptr = 0;
1033 bcc_ptr++;
1034 }
1035 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1036 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1037 } else {
1038 /* BB: is this right? */
1039 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1040 }
1041
1042 sess_data->iov[2].iov_len = (long) bcc_ptr -
1043 (long) sess_data->iov[2].iov_base;
1044
1045 rc = sess_sendreceive(sess_data);
1046 if (rc)
1047 goto out_put_spnego_key;
1048
1049 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1050 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1051
1052 if (smb_buf->WordCount != 4) {
1053 rc = -EIO;
1054 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1055 goto out_put_spnego_key;
1056 }
1057
1058 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1059 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1060
1061 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1062 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1063
1064 bytes_remaining = get_bcc(smb_buf);
1065 bcc_ptr = pByteArea(smb_buf);
1066
1067 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1068 if (blob_len > bytes_remaining) {
1069 cifs_dbg(VFS, "bad security blob length %d\n",
1070 blob_len);
1071 rc = -EINVAL;
1072 goto out_put_spnego_key;
1073 }
1074 bcc_ptr += blob_len;
1075 bytes_remaining -= blob_len;
1076
1077 /* BB check if Unicode and decode strings */
1078 if (bytes_remaining == 0) {
1079 /* no string area to decode, do nothing */
1080 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1081 /* unicode string area must be word-aligned */
1082 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1083 ++bcc_ptr;
1084 --bytes_remaining;
1085 }
1086 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1087 sess_data->nls_cp);
1088 } else {
1089 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1090 sess_data->nls_cp);
1091 }
1092
1093 rc = sess_establish_session(sess_data);
1094 out_put_spnego_key:
1095 key_invalidate(spnego_key);
1096 key_put(spnego_key);
1097 out:
1098 sess_data->result = rc;
1099 sess_data->func = NULL;
1100 sess_free_buffer(sess_data);
1101 kfree(ses->auth_key.response);
1102 ses->auth_key.response = NULL;
1103 }
1104
1105 #else
1106
1107 static void
1108 sess_auth_kerberos(struct sess_data *sess_data)
1109 {
1110 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1111 sess_data->result = -ENOSYS;
1112 sess_data->func = NULL;
1113 }
1114 #endif /* ! CONFIG_CIFS_UPCALL */
1115
1116 /*
1117 * The required kvec buffers have to be allocated before calling this
1118 * function.
1119 */
1120 static int
1121 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1122 {
1123 struct smb_hdr *smb_buf;
1124 SESSION_SETUP_ANDX *pSMB;
1125 struct cifs_ses *ses = sess_data->ses;
1126 __u32 capabilities;
1127 char *bcc_ptr;
1128
1129 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1130 smb_buf = (struct smb_hdr *)pSMB;
1131
1132 capabilities = cifs_ssetup_hdr(ses, pSMB);
1133 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1134 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1135 return -ENOSYS;
1136 }
1137
1138 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1139 capabilities |= CAP_EXTENDED_SECURITY;
1140 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1141
1142 bcc_ptr = sess_data->iov[2].iov_base;
1143 /* unicode strings must be word aligned */
1144 if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1145 *bcc_ptr = 0;
1146 bcc_ptr++;
1147 }
1148 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1149
1150 sess_data->iov[2].iov_len = (long) bcc_ptr -
1151 (long) sess_data->iov[2].iov_base;
1152
1153 return 0;
1154 }
1155
1156 static void
1157 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1158
1159 static void
1160 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1161 {
1162 int rc;
1163 struct smb_hdr *smb_buf;
1164 SESSION_SETUP_ANDX *pSMB;
1165 struct cifs_ses *ses = sess_data->ses;
1166 __u16 bytes_remaining;
1167 char *bcc_ptr;
1168 u16 blob_len;
1169
1170 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1171
1172 /*
1173 * if memory allocation is successful, caller of this function
1174 * frees it.
1175 */
1176 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1177 if (!ses->ntlmssp) {
1178 rc = -ENOMEM;
1179 goto out;
1180 }
1181 ses->ntlmssp->sesskey_per_smbsess = false;
1182
1183 /* wct = 12 */
1184 rc = sess_alloc_buffer(sess_data, 12);
1185 if (rc)
1186 goto out;
1187
1188 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1189
1190 /* Build security blob before we assemble the request */
1191 build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
1192 sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
1193 sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
1194 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
1195
1196 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1197 if (rc)
1198 goto out;
1199
1200 rc = sess_sendreceive(sess_data);
1201
1202 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1203 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1204
1205 /* If true, rc here is expected and not an error */
1206 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1207 smb_buf->Status.CifsError ==
1208 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1209 rc = 0;
1210
1211 if (rc)
1212 goto out;
1213
1214 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1215
1216 if (smb_buf->WordCount != 4) {
1217 rc = -EIO;
1218 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1219 goto out;
1220 }
1221
1222 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1223 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1224
1225 bytes_remaining = get_bcc(smb_buf);
1226 bcc_ptr = pByteArea(smb_buf);
1227
1228 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1229 if (blob_len > bytes_remaining) {
1230 cifs_dbg(VFS, "bad security blob length %d\n",
1231 blob_len);
1232 rc = -EINVAL;
1233 goto out;
1234 }
1235
1236 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1237 out:
1238 sess_free_buffer(sess_data);
1239
1240 if (!rc) {
1241 sess_data->func = sess_auth_rawntlmssp_authenticate;
1242 return;
1243 }
1244
1245 /* Else error. Cleanup */
1246 kfree(ses->auth_key.response);
1247 ses->auth_key.response = NULL;
1248 kfree(ses->ntlmssp);
1249 ses->ntlmssp = NULL;
1250
1251 sess_data->func = NULL;
1252 sess_data->result = rc;
1253 }
1254
1255 static void
1256 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1257 {
1258 int rc;
1259 struct smb_hdr *smb_buf;
1260 SESSION_SETUP_ANDX *pSMB;
1261 struct cifs_ses *ses = sess_data->ses;
1262 __u16 bytes_remaining;
1263 char *bcc_ptr;
1264 char *ntlmsspblob = NULL;
1265 u16 blob_len;
1266
1267 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1268
1269 /* wct = 12 */
1270 rc = sess_alloc_buffer(sess_data, 12);
1271 if (rc)
1272 goto out;
1273
1274 /* Build security blob before we assemble the request */
1275 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1276 smb_buf = (struct smb_hdr *)pSMB;
1277 /*
1278 * 5 is an empirical value, large enough to hold
1279 * authenticate message plus max 10 of av paris,
1280 * domain, user, workstation names, flags, etc.
1281 */
1282 ntlmsspblob = kzalloc(5*sizeof(struct _AUTHENTICATE_MESSAGE),
1283 GFP_KERNEL);
1284 if (!ntlmsspblob) {
1285 rc = -ENOMEM;
1286 goto out;
1287 }
1288
1289 rc = build_ntlmssp_auth_blob(ntlmsspblob,
1290 &blob_len, ses, sess_data->nls_cp);
1291 if (rc)
1292 goto out_free_ntlmsspblob;
1293 sess_data->iov[1].iov_len = blob_len;
1294 sess_data->iov[1].iov_base = ntlmsspblob;
1295 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1296 /*
1297 * Make sure that we tell the server that we are using
1298 * the uid that it just gave us back on the response
1299 * (challenge)
1300 */
1301 smb_buf->Uid = ses->Suid;
1302
1303 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1304 if (rc)
1305 goto out_free_ntlmsspblob;
1306
1307 rc = sess_sendreceive(sess_data);
1308 if (rc)
1309 goto out_free_ntlmsspblob;
1310
1311 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1312 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1313 if (smb_buf->WordCount != 4) {
1314 rc = -EIO;
1315 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1316 goto out_free_ntlmsspblob;
1317 }
1318
1319 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1320 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1321
1322 bytes_remaining = get_bcc(smb_buf);
1323 bcc_ptr = pByteArea(smb_buf);
1324 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1325 if (blob_len > bytes_remaining) {
1326 cifs_dbg(VFS, "bad security blob length %d\n",
1327 blob_len);
1328 rc = -EINVAL;
1329 goto out_free_ntlmsspblob;
1330 }
1331 bcc_ptr += blob_len;
1332 bytes_remaining -= blob_len;
1333
1334
1335 /* BB check if Unicode and decode strings */
1336 if (bytes_remaining == 0) {
1337 /* no string area to decode, do nothing */
1338 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1339 /* unicode string area must be word-aligned */
1340 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1341 ++bcc_ptr;
1342 --bytes_remaining;
1343 }
1344 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1345 sess_data->nls_cp);
1346 } else {
1347 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1348 sess_data->nls_cp);
1349 }
1350
1351 out_free_ntlmsspblob:
1352 kfree(ntlmsspblob);
1353 out:
1354 sess_free_buffer(sess_data);
1355
1356 if (!rc)
1357 rc = sess_establish_session(sess_data);
1358
1359 /* Cleanup */
1360 kfree(ses->auth_key.response);
1361 ses->auth_key.response = NULL;
1362 kfree(ses->ntlmssp);
1363 ses->ntlmssp = NULL;
1364
1365 sess_data->func = NULL;
1366 sess_data->result = rc;
1367 }
1368
1369 static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
1370 {
1371 int type;
1372
1373 type = select_sectype(ses->server, ses->sectype);
1374 cifs_dbg(FYI, "sess setup type %d\n", type);
1375 if (type == Unspecified) {
1376 cifs_dbg(VFS,
1377 "Unable to select appropriate authentication method!");
1378 return -EINVAL;
1379 }
1380
1381 switch (type) {
1382 case LANMAN:
1383 /* LANMAN and plaintext are less secure and off by default.
1384 * So we make this explicitly be turned on in kconfig (in the
1385 * build) and turned on at runtime (changed from the default)
1386 * in proc/fs/cifs or via mount parm. Unfortunately this is
1387 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
1388 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1389 sess_data->func = sess_auth_lanman;
1390 break;
1391 #else
1392 return -EOPNOTSUPP;
1393 #endif
1394 case NTLM:
1395 sess_data->func = sess_auth_ntlm;
1396 break;
1397 case NTLMv2:
1398 sess_data->func = sess_auth_ntlmv2;
1399 break;
1400 case Kerberos:
1401 #ifdef CONFIG_CIFS_UPCALL
1402 sess_data->func = sess_auth_kerberos;
1403 break;
1404 #else
1405 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1406 return -ENOSYS;
1407 break;
1408 #endif /* CONFIG_CIFS_UPCALL */
1409 case RawNTLMSSP:
1410 sess_data->func = sess_auth_rawntlmssp_negotiate;
1411 break;
1412 default:
1413 cifs_dbg(VFS, "secType %d not supported!\n", type);
1414 return -ENOSYS;
1415 }
1416
1417 return 0;
1418 }
1419
1420 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1421 const struct nls_table *nls_cp)
1422 {
1423 int rc = 0;
1424 struct sess_data *sess_data;
1425
1426 if (ses == NULL) {
1427 WARN(1, "%s: ses == NULL!", __func__);
1428 return -EINVAL;
1429 }
1430
1431 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1432 if (!sess_data)
1433 return -ENOMEM;
1434
1435 rc = select_sec(ses, sess_data);
1436 if (rc)
1437 goto out;
1438
1439 sess_data->xid = xid;
1440 sess_data->ses = ses;
1441 sess_data->buf0_type = CIFS_NO_BUFFER;
1442 sess_data->nls_cp = (struct nls_table *) nls_cp;
1443
1444 while (sess_data->func)
1445 sess_data->func(sess_data);
1446
1447 /* Store result before we free sess_data */
1448 rc = sess_data->result;
1449
1450 out:
1451 kfree(sess_data);
1452 return rc;
1453 }
Linux kernel - Deliverables
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