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VFS: normal filesystems (and lustre): d_inode() annotations
[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 = 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 if (ses->server->sign) {
349 flags |= NTLMSSP_NEGOTIATE_SIGN;
350 if (!ses->server->session_estab ||
351 ses->ntlmssp->sesskey_per_smbsess)
352 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
353 }
354
355 sec_blob->NegotiateFlags = cpu_to_le32(flags);
356
357 sec_blob->WorkstationName.BufferOffset = 0;
358 sec_blob->WorkstationName.Length = 0;
359 sec_blob->WorkstationName.MaximumLength = 0;
360
361 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
362 sec_blob->DomainName.BufferOffset = 0;
363 sec_blob->DomainName.Length = 0;
364 sec_blob->DomainName.MaximumLength = 0;
365 }
366
367 /* We do not malloc the blob, it is passed in pbuffer, because its
368 maximum possible size is fixed and small, making this approach cleaner.
369 This function returns the length of the data in the blob */
370 int build_ntlmssp_auth_blob(unsigned char *pbuffer,
371 u16 *buflen,
372 struct cifs_ses *ses,
373 const struct nls_table *nls_cp)
374 {
375 int rc;
376 AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer;
377 __u32 flags;
378 unsigned char *tmp;
379
380 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
381 sec_blob->MessageType = NtLmAuthenticate;
382
383 flags = NTLMSSP_NEGOTIATE_56 |
384 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
385 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
386 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
387 if (ses->server->sign) {
388 flags |= NTLMSSP_NEGOTIATE_SIGN;
389 if (!ses->server->session_estab ||
390 ses->ntlmssp->sesskey_per_smbsess)
391 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
392 }
393
394 tmp = pbuffer + sizeof(AUTHENTICATE_MESSAGE);
395 sec_blob->NegotiateFlags = cpu_to_le32(flags);
396
397 sec_blob->LmChallengeResponse.BufferOffset =
398 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
399 sec_blob->LmChallengeResponse.Length = 0;
400 sec_blob->LmChallengeResponse.MaximumLength = 0;
401
402 sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer);
403 rc = setup_ntlmv2_rsp(ses, nls_cp);
404 if (rc) {
405 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
406 goto setup_ntlmv2_ret;
407 }
408 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
409 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
410 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
411
412 sec_blob->NtChallengeResponse.Length =
413 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
414 sec_blob->NtChallengeResponse.MaximumLength =
415 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
416
417 if (ses->domainName == NULL) {
418 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
419 sec_blob->DomainName.Length = 0;
420 sec_blob->DomainName.MaximumLength = 0;
421 tmp += 2;
422 } else {
423 int len;
424 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
425 CIFS_MAX_USERNAME_LEN, nls_cp);
426 len *= 2; /* unicode is 2 bytes each */
427 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
428 sec_blob->DomainName.Length = cpu_to_le16(len);
429 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
430 tmp += len;
431 }
432
433 if (ses->user_name == NULL) {
434 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
435 sec_blob->UserName.Length = 0;
436 sec_blob->UserName.MaximumLength = 0;
437 tmp += 2;
438 } else {
439 int len;
440 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
441 CIFS_MAX_USERNAME_LEN, nls_cp);
442 len *= 2; /* unicode is 2 bytes each */
443 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
444 sec_blob->UserName.Length = cpu_to_le16(len);
445 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
446 tmp += len;
447 }
448
449 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - pbuffer);
450 sec_blob->WorkstationName.Length = 0;
451 sec_blob->WorkstationName.MaximumLength = 0;
452 tmp += 2;
453
454 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
455 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
456 && !calc_seckey(ses)) {
457 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
458 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
459 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
460 sec_blob->SessionKey.MaximumLength =
461 cpu_to_le16(CIFS_CPHTXT_SIZE);
462 tmp += CIFS_CPHTXT_SIZE;
463 } else {
464 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
465 sec_blob->SessionKey.Length = 0;
466 sec_blob->SessionKey.MaximumLength = 0;
467 }
468
469 setup_ntlmv2_ret:
470 *buflen = tmp - pbuffer;
471 return rc;
472 }
473
474 enum securityEnum
475 select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
476 {
477 switch (server->negflavor) {
478 case CIFS_NEGFLAVOR_EXTENDED:
479 switch (requested) {
480 case Kerberos:
481 case RawNTLMSSP:
482 return requested;
483 case Unspecified:
484 if (server->sec_ntlmssp &&
485 (global_secflags & CIFSSEC_MAY_NTLMSSP))
486 return RawNTLMSSP;
487 if ((server->sec_kerberos || server->sec_mskerberos) &&
488 (global_secflags & CIFSSEC_MAY_KRB5))
489 return Kerberos;
490 /* Fallthrough */
491 default:
492 return Unspecified;
493 }
494 case CIFS_NEGFLAVOR_UNENCAP:
495 switch (requested) {
496 case NTLM:
497 case NTLMv2:
498 return requested;
499 case Unspecified:
500 if (global_secflags & CIFSSEC_MAY_NTLMV2)
501 return NTLMv2;
502 if (global_secflags & CIFSSEC_MAY_NTLM)
503 return NTLM;
504 default:
505 /* Fallthrough to attempt LANMAN authentication next */
506 break;
507 }
508 case CIFS_NEGFLAVOR_LANMAN:
509 switch (requested) {
510 case LANMAN:
511 return requested;
512 case Unspecified:
513 if (global_secflags & CIFSSEC_MAY_LANMAN)
514 return LANMAN;
515 /* Fallthrough */
516 default:
517 return Unspecified;
518 }
519 default:
520 return Unspecified;
521 }
522 }
523
524 struct sess_data {
525 unsigned int xid;
526 struct cifs_ses *ses;
527 struct nls_table *nls_cp;
528 void (*func)(struct sess_data *);
529 int result;
530
531 /* we will send the SMB in three pieces:
532 * a fixed length beginning part, an optional
533 * SPNEGO blob (which can be zero length), and a
534 * last part which will include the strings
535 * and rest of bcc area. This allows us to avoid
536 * a large buffer 17K allocation
537 */
538 int buf0_type;
539 struct kvec iov[3];
540 };
541
542 static int
543 sess_alloc_buffer(struct sess_data *sess_data, int wct)
544 {
545 int rc;
546 struct cifs_ses *ses = sess_data->ses;
547 struct smb_hdr *smb_buf;
548
549 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
550 (void **)&smb_buf);
551
552 if (rc)
553 return rc;
554
555 sess_data->iov[0].iov_base = (char *)smb_buf;
556 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
557 /*
558 * This variable will be used to clear the buffer
559 * allocated above in case of any error in the calling function.
560 */
561 sess_data->buf0_type = CIFS_SMALL_BUFFER;
562
563 /* 2000 big enough to fit max user, domain, NOS name etc. */
564 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
565 if (!sess_data->iov[2].iov_base) {
566 rc = -ENOMEM;
567 goto out_free_smb_buf;
568 }
569
570 return 0;
571
572 out_free_smb_buf:
573 kfree(smb_buf);
574 sess_data->iov[0].iov_base = NULL;
575 sess_data->iov[0].iov_len = 0;
576 sess_data->buf0_type = CIFS_NO_BUFFER;
577 return rc;
578 }
579
580 static void
581 sess_free_buffer(struct sess_data *sess_data)
582 {
583
584 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
585 sess_data->buf0_type = CIFS_NO_BUFFER;
586 kfree(sess_data->iov[2].iov_base);
587 }
588
589 static int
590 sess_establish_session(struct sess_data *sess_data)
591 {
592 struct cifs_ses *ses = sess_data->ses;
593
594 mutex_lock(&ses->server->srv_mutex);
595 if (!ses->server->session_estab) {
596 if (ses->server->sign) {
597 ses->server->session_key.response =
598 kmemdup(ses->auth_key.response,
599 ses->auth_key.len, GFP_KERNEL);
600 if (!ses->server->session_key.response) {
601 mutex_unlock(&ses->server->srv_mutex);
602 return -ENOMEM;
603 }
604 ses->server->session_key.len =
605 ses->auth_key.len;
606 }
607 ses->server->sequence_number = 0x2;
608 ses->server->session_estab = true;
609 }
610 mutex_unlock(&ses->server->srv_mutex);
611
612 cifs_dbg(FYI, "CIFS session established successfully\n");
613 spin_lock(&GlobalMid_Lock);
614 ses->status = CifsGood;
615 ses->need_reconnect = false;
616 spin_unlock(&GlobalMid_Lock);
617
618 return 0;
619 }
620
621 static int
622 sess_sendreceive(struct sess_data *sess_data)
623 {
624 int rc;
625 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
626 __u16 count;
627
628 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
629 smb_buf->smb_buf_length =
630 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
631 put_bcc(count, smb_buf);
632
633 rc = SendReceive2(sess_data->xid, sess_data->ses,
634 sess_data->iov, 3 /* num_iovecs */,
635 &sess_data->buf0_type,
636 CIFS_LOG_ERROR);
637
638 return rc;
639 }
640
641 /*
642 * LANMAN and plaintext are less secure and off by default.
643 * So we make this explicitly be turned on in kconfig (in the
644 * build) and turned on at runtime (changed from the default)
645 * in proc/fs/cifs or via mount parm. Unfortunately this is
646 * needed for old Win (e.g. Win95), some obscure NAS and OS/2
647 */
648 #ifdef CONFIG_CIFS_WEAK_PW_HASH
649 static void
650 sess_auth_lanman(struct sess_data *sess_data)
651 {
652 int rc = 0;
653 struct smb_hdr *smb_buf;
654 SESSION_SETUP_ANDX *pSMB;
655 char *bcc_ptr;
656 struct cifs_ses *ses = sess_data->ses;
657 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
658 __u32 capabilities;
659 __u16 bytes_remaining;
660
661 /* lanman 2 style sessionsetup */
662 /* wct = 10 */
663 rc = sess_alloc_buffer(sess_data, 10);
664 if (rc)
665 goto out;
666
667 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
668 bcc_ptr = sess_data->iov[2].iov_base;
669 capabilities = cifs_ssetup_hdr(ses, pSMB);
670
671 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
672
673 /* no capabilities flags in old lanman negotiation */
674 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
675
676 /* Calculate hash with password and copy into bcc_ptr.
677 * Encryption Key (stored as in cryptkey) gets used if the
678 * security mode bit in Negottiate Protocol response states
679 * to use challenge/response method (i.e. Password bit is 1).
680 */
681 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
682 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
683 true : false, lnm_session_key);
684
685 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
686 bcc_ptr += CIFS_AUTH_RESP_SIZE;
687
688 /*
689 * can not sign if LANMAN negotiated so no need
690 * to calculate signing key? but what if server
691 * changed to do higher than lanman dialect and
692 * we reconnected would we ever calc signing_key?
693 */
694
695 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
696 /* Unicode not allowed for LANMAN dialects */
697 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
698
699 sess_data->iov[2].iov_len = (long) bcc_ptr -
700 (long) sess_data->iov[2].iov_base;
701
702 rc = sess_sendreceive(sess_data);
703 if (rc)
704 goto out;
705
706 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
707 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
708
709 /* lanman response has a word count of 3 */
710 if (smb_buf->WordCount != 3) {
711 rc = -EIO;
712 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
713 goto out;
714 }
715
716 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
717 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
718
719 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
720 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
721
722 bytes_remaining = get_bcc(smb_buf);
723 bcc_ptr = pByteArea(smb_buf);
724
725 /* BB check if Unicode and decode strings */
726 if (bytes_remaining == 0) {
727 /* no string area to decode, do nothing */
728 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
729 /* unicode string area must be word-aligned */
730 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
731 ++bcc_ptr;
732 --bytes_remaining;
733 }
734 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
735 sess_data->nls_cp);
736 } else {
737 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
738 sess_data->nls_cp);
739 }
740
741 rc = sess_establish_session(sess_data);
742 out:
743 sess_data->result = rc;
744 sess_data->func = NULL;
745 sess_free_buffer(sess_data);
746 }
747
748 #endif
749
750 static void
751 sess_auth_ntlm(struct sess_data *sess_data)
752 {
753 int rc = 0;
754 struct smb_hdr *smb_buf;
755 SESSION_SETUP_ANDX *pSMB;
756 char *bcc_ptr;
757 struct cifs_ses *ses = sess_data->ses;
758 __u32 capabilities;
759 __u16 bytes_remaining;
760
761 /* old style NTLM sessionsetup */
762 /* wct = 13 */
763 rc = sess_alloc_buffer(sess_data, 13);
764 if (rc)
765 goto out;
766
767 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
768 bcc_ptr = sess_data->iov[2].iov_base;
769 capabilities = cifs_ssetup_hdr(ses, pSMB);
770
771 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
772 pSMB->req_no_secext.CaseInsensitivePasswordLength =
773 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
774 pSMB->req_no_secext.CaseSensitivePasswordLength =
775 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
776
777 /* calculate ntlm response and session key */
778 rc = setup_ntlm_response(ses, sess_data->nls_cp);
779 if (rc) {
780 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
781 rc);
782 goto out;
783 }
784
785 /* copy ntlm response */
786 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
787 CIFS_AUTH_RESP_SIZE);
788 bcc_ptr += CIFS_AUTH_RESP_SIZE;
789 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
790 CIFS_AUTH_RESP_SIZE);
791 bcc_ptr += CIFS_AUTH_RESP_SIZE;
792
793 if (ses->capabilities & CAP_UNICODE) {
794 /* unicode strings must be word aligned */
795 if (sess_data->iov[0].iov_len % 2) {
796 *bcc_ptr = 0;
797 bcc_ptr++;
798 }
799 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
800 } else {
801 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
802 }
803
804
805 sess_data->iov[2].iov_len = (long) bcc_ptr -
806 (long) sess_data->iov[2].iov_base;
807
808 rc = sess_sendreceive(sess_data);
809 if (rc)
810 goto out;
811
812 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
813 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
814
815 if (smb_buf->WordCount != 3) {
816 rc = -EIO;
817 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
818 goto out;
819 }
820
821 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
822 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
823
824 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
825 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
826
827 bytes_remaining = get_bcc(smb_buf);
828 bcc_ptr = pByteArea(smb_buf);
829
830 /* BB check if Unicode and decode strings */
831 if (bytes_remaining == 0) {
832 /* no string area to decode, do nothing */
833 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
834 /* unicode string area must be word-aligned */
835 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
836 ++bcc_ptr;
837 --bytes_remaining;
838 }
839 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
840 sess_data->nls_cp);
841 } else {
842 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
843 sess_data->nls_cp);
844 }
845
846 rc = sess_establish_session(sess_data);
847 out:
848 sess_data->result = rc;
849 sess_data->func = NULL;
850 sess_free_buffer(sess_data);
851 kfree(ses->auth_key.response);
852 ses->auth_key.response = NULL;
853 }
854
855 static void
856 sess_auth_ntlmv2(struct sess_data *sess_data)
857 {
858 int rc = 0;
859 struct smb_hdr *smb_buf;
860 SESSION_SETUP_ANDX *pSMB;
861 char *bcc_ptr;
862 struct cifs_ses *ses = sess_data->ses;
863 __u32 capabilities;
864 __u16 bytes_remaining;
865
866 /* old style NTLM sessionsetup */
867 /* wct = 13 */
868 rc = sess_alloc_buffer(sess_data, 13);
869 if (rc)
870 goto out;
871
872 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
873 bcc_ptr = sess_data->iov[2].iov_base;
874 capabilities = cifs_ssetup_hdr(ses, pSMB);
875
876 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
877
878 /* LM2 password would be here if we supported it */
879 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
880
881 /* calculate nlmv2 response and session key */
882 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
883 if (rc) {
884 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
885 goto out;
886 }
887
888 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
889 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
890 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
891
892 /* set case sensitive password length after tilen may get
893 * assigned, tilen is 0 otherwise.
894 */
895 pSMB->req_no_secext.CaseSensitivePasswordLength =
896 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
897
898 if (ses->capabilities & CAP_UNICODE) {
899 if (sess_data->iov[0].iov_len % 2) {
900 *bcc_ptr = 0;
901 bcc_ptr++;
902 }
903 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
904 } else {
905 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
906 }
907
908
909 sess_data->iov[2].iov_len = (long) bcc_ptr -
910 (long) sess_data->iov[2].iov_base;
911
912 rc = sess_sendreceive(sess_data);
913 if (rc)
914 goto out;
915
916 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
917 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
918
919 if (smb_buf->WordCount != 3) {
920 rc = -EIO;
921 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
922 goto out;
923 }
924
925 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
926 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
927
928 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
929 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
930
931 bytes_remaining = get_bcc(smb_buf);
932 bcc_ptr = pByteArea(smb_buf);
933
934 /* BB check if Unicode and decode strings */
935 if (bytes_remaining == 0) {
936 /* no string area to decode, do nothing */
937 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
938 /* unicode string area must be word-aligned */
939 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
940 ++bcc_ptr;
941 --bytes_remaining;
942 }
943 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
944 sess_data->nls_cp);
945 } else {
946 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
947 sess_data->nls_cp);
948 }
949
950 rc = sess_establish_session(sess_data);
951 out:
952 sess_data->result = rc;
953 sess_data->func = NULL;
954 sess_free_buffer(sess_data);
955 kfree(ses->auth_key.response);
956 ses->auth_key.response = NULL;
957 }
958
959 #ifdef CONFIG_CIFS_UPCALL
960 static void
961 sess_auth_kerberos(struct sess_data *sess_data)
962 {
963 int rc = 0;
964 struct smb_hdr *smb_buf;
965 SESSION_SETUP_ANDX *pSMB;
966 char *bcc_ptr;
967 struct cifs_ses *ses = sess_data->ses;
968 __u32 capabilities;
969 __u16 bytes_remaining;
970 struct key *spnego_key = NULL;
971 struct cifs_spnego_msg *msg;
972 u16 blob_len;
973
974 /* extended security */
975 /* wct = 12 */
976 rc = sess_alloc_buffer(sess_data, 12);
977 if (rc)
978 goto out;
979
980 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
981 bcc_ptr = sess_data->iov[2].iov_base;
982 capabilities = cifs_ssetup_hdr(ses, pSMB);
983
984 spnego_key = cifs_get_spnego_key(ses);
985 if (IS_ERR(spnego_key)) {
986 rc = PTR_ERR(spnego_key);
987 spnego_key = NULL;
988 goto out;
989 }
990
991 msg = spnego_key->payload.data;
992 /*
993 * check version field to make sure that cifs.upcall is
994 * sending us a response in an expected form
995 */
996 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
997 cifs_dbg(VFS,
998 "incorrect version of cifs.upcall (expected %d but got %d)",
999 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1000 rc = -EKEYREJECTED;
1001 goto out_put_spnego_key;
1002 }
1003
1004 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1005 GFP_KERNEL);
1006 if (!ses->auth_key.response) {
1007 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory",
1008 msg->sesskey_len);
1009 rc = -ENOMEM;
1010 goto out_put_spnego_key;
1011 }
1012 ses->auth_key.len = msg->sesskey_len;
1013
1014 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1015 capabilities |= CAP_EXTENDED_SECURITY;
1016 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1017 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1018 sess_data->iov[1].iov_len = msg->secblob_len;
1019 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1020
1021 if (ses->capabilities & CAP_UNICODE) {
1022 /* unicode strings must be word aligned */
1023 if ((sess_data->iov[0].iov_len
1024 + sess_data->iov[1].iov_len) % 2) {
1025 *bcc_ptr = 0;
1026 bcc_ptr++;
1027 }
1028 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1029 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1030 } else {
1031 /* BB: is this right? */
1032 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1033 }
1034
1035 sess_data->iov[2].iov_len = (long) bcc_ptr -
1036 (long) sess_data->iov[2].iov_base;
1037
1038 rc = sess_sendreceive(sess_data);
1039 if (rc)
1040 goto out_put_spnego_key;
1041
1042 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1043 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1044
1045 if (smb_buf->WordCount != 4) {
1046 rc = -EIO;
1047 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1048 goto out_put_spnego_key;
1049 }
1050
1051 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1052 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1053
1054 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1055 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1056
1057 bytes_remaining = get_bcc(smb_buf);
1058 bcc_ptr = pByteArea(smb_buf);
1059
1060 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1061 if (blob_len > bytes_remaining) {
1062 cifs_dbg(VFS, "bad security blob length %d\n",
1063 blob_len);
1064 rc = -EINVAL;
1065 goto out_put_spnego_key;
1066 }
1067 bcc_ptr += blob_len;
1068 bytes_remaining -= blob_len;
1069
1070 /* BB check if Unicode and decode strings */
1071 if (bytes_remaining == 0) {
1072 /* no string area to decode, do nothing */
1073 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1074 /* unicode string area must be word-aligned */
1075 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1076 ++bcc_ptr;
1077 --bytes_remaining;
1078 }
1079 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1080 sess_data->nls_cp);
1081 } else {
1082 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1083 sess_data->nls_cp);
1084 }
1085
1086 rc = sess_establish_session(sess_data);
1087 out_put_spnego_key:
1088 key_invalidate(spnego_key);
1089 key_put(spnego_key);
1090 out:
1091 sess_data->result = rc;
1092 sess_data->func = NULL;
1093 sess_free_buffer(sess_data);
1094 kfree(ses->auth_key.response);
1095 ses->auth_key.response = NULL;
1096 }
1097
1098 #endif /* ! CONFIG_CIFS_UPCALL */
1099
1100 /*
1101 * The required kvec buffers have to be allocated before calling this
1102 * function.
1103 */
1104 static int
1105 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1106 {
1107 struct smb_hdr *smb_buf;
1108 SESSION_SETUP_ANDX *pSMB;
1109 struct cifs_ses *ses = sess_data->ses;
1110 __u32 capabilities;
1111 char *bcc_ptr;
1112
1113 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1114 smb_buf = (struct smb_hdr *)pSMB;
1115
1116 capabilities = cifs_ssetup_hdr(ses, pSMB);
1117 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1118 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1119 return -ENOSYS;
1120 }
1121
1122 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1123 capabilities |= CAP_EXTENDED_SECURITY;
1124 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1125
1126 bcc_ptr = sess_data->iov[2].iov_base;
1127 /* unicode strings must be word aligned */
1128 if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1129 *bcc_ptr = 0;
1130 bcc_ptr++;
1131 }
1132 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1133
1134 sess_data->iov[2].iov_len = (long) bcc_ptr -
1135 (long) sess_data->iov[2].iov_base;
1136
1137 return 0;
1138 }
1139
1140 static void
1141 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1142
1143 static void
1144 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1145 {
1146 int rc;
1147 struct smb_hdr *smb_buf;
1148 SESSION_SETUP_ANDX *pSMB;
1149 struct cifs_ses *ses = sess_data->ses;
1150 __u16 bytes_remaining;
1151 char *bcc_ptr;
1152 u16 blob_len;
1153
1154 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1155
1156 /*
1157 * if memory allocation is successful, caller of this function
1158 * frees it.
1159 */
1160 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1161 if (!ses->ntlmssp) {
1162 rc = -ENOMEM;
1163 goto out;
1164 }
1165 ses->ntlmssp->sesskey_per_smbsess = false;
1166
1167 /* wct = 12 */
1168 rc = sess_alloc_buffer(sess_data, 12);
1169 if (rc)
1170 goto out;
1171
1172 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1173
1174 /* Build security blob before we assemble the request */
1175 build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
1176 sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
1177 sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
1178 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
1179
1180 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1181 if (rc)
1182 goto out;
1183
1184 rc = sess_sendreceive(sess_data);
1185
1186 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1187 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1188
1189 /* If true, rc here is expected and not an error */
1190 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1191 smb_buf->Status.CifsError ==
1192 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1193 rc = 0;
1194
1195 if (rc)
1196 goto out;
1197
1198 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1199
1200 if (smb_buf->WordCount != 4) {
1201 rc = -EIO;
1202 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1203 goto out;
1204 }
1205
1206 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1207 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1208
1209 bytes_remaining = get_bcc(smb_buf);
1210 bcc_ptr = pByteArea(smb_buf);
1211
1212 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1213 if (blob_len > bytes_remaining) {
1214 cifs_dbg(VFS, "bad security blob length %d\n",
1215 blob_len);
1216 rc = -EINVAL;
1217 goto out;
1218 }
1219
1220 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1221 out:
1222 sess_free_buffer(sess_data);
1223
1224 if (!rc) {
1225 sess_data->func = sess_auth_rawntlmssp_authenticate;
1226 return;
1227 }
1228
1229 /* Else error. Cleanup */
1230 kfree(ses->auth_key.response);
1231 ses->auth_key.response = NULL;
1232 kfree(ses->ntlmssp);
1233 ses->ntlmssp = NULL;
1234
1235 sess_data->func = NULL;
1236 sess_data->result = rc;
1237 }
1238
1239 static void
1240 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1241 {
1242 int rc;
1243 struct smb_hdr *smb_buf;
1244 SESSION_SETUP_ANDX *pSMB;
1245 struct cifs_ses *ses = sess_data->ses;
1246 __u16 bytes_remaining;
1247 char *bcc_ptr;
1248 char *ntlmsspblob = NULL;
1249 u16 blob_len;
1250
1251 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1252
1253 /* wct = 12 */
1254 rc = sess_alloc_buffer(sess_data, 12);
1255 if (rc)
1256 goto out;
1257
1258 /* Build security blob before we assemble the request */
1259 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1260 smb_buf = (struct smb_hdr *)pSMB;
1261 /*
1262 * 5 is an empirical value, large enough to hold
1263 * authenticate message plus max 10 of av paris,
1264 * domain, user, workstation names, flags, etc.
1265 */
1266 ntlmsspblob = kzalloc(5*sizeof(struct _AUTHENTICATE_MESSAGE),
1267 GFP_KERNEL);
1268 if (!ntlmsspblob) {
1269 rc = -ENOMEM;
1270 goto out;
1271 }
1272
1273 rc = build_ntlmssp_auth_blob(ntlmsspblob,
1274 &blob_len, ses, sess_data->nls_cp);
1275 if (rc)
1276 goto out_free_ntlmsspblob;
1277 sess_data->iov[1].iov_len = blob_len;
1278 sess_data->iov[1].iov_base = ntlmsspblob;
1279 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1280 /*
1281 * Make sure that we tell the server that we are using
1282 * the uid that it just gave us back on the response
1283 * (challenge)
1284 */
1285 smb_buf->Uid = ses->Suid;
1286
1287 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1288 if (rc)
1289 goto out_free_ntlmsspblob;
1290
1291 rc = sess_sendreceive(sess_data);
1292 if (rc)
1293 goto out_free_ntlmsspblob;
1294
1295 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1296 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1297 if (smb_buf->WordCount != 4) {
1298 rc = -EIO;
1299 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1300 goto out_free_ntlmsspblob;
1301 }
1302
1303 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1304 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1305
1306 if (ses->Suid != smb_buf->Uid) {
1307 ses->Suid = smb_buf->Uid;
1308 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1309 }
1310
1311 bytes_remaining = get_bcc(smb_buf);
1312 bcc_ptr = pByteArea(smb_buf);
1313 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1314 if (blob_len > bytes_remaining) {
1315 cifs_dbg(VFS, "bad security blob length %d\n",
1316 blob_len);
1317 rc = -EINVAL;
1318 goto out_free_ntlmsspblob;
1319 }
1320 bcc_ptr += blob_len;
1321 bytes_remaining -= blob_len;
1322
1323
1324 /* BB check if Unicode and decode strings */
1325 if (bytes_remaining == 0) {
1326 /* no string area to decode, do nothing */
1327 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1328 /* unicode string area must be word-aligned */
1329 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1330 ++bcc_ptr;
1331 --bytes_remaining;
1332 }
1333 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1334 sess_data->nls_cp);
1335 } else {
1336 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1337 sess_data->nls_cp);
1338 }
1339
1340 out_free_ntlmsspblob:
1341 kfree(ntlmsspblob);
1342 out:
1343 sess_free_buffer(sess_data);
1344
1345 if (!rc)
1346 rc = sess_establish_session(sess_data);
1347
1348 /* Cleanup */
1349 kfree(ses->auth_key.response);
1350 ses->auth_key.response = NULL;
1351 kfree(ses->ntlmssp);
1352 ses->ntlmssp = NULL;
1353
1354 sess_data->func = NULL;
1355 sess_data->result = rc;
1356 }
1357
1358 static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
1359 {
1360 int type;
1361
1362 type = select_sectype(ses->server, ses->sectype);
1363 cifs_dbg(FYI, "sess setup type %d\n", type);
1364 if (type == Unspecified) {
1365 cifs_dbg(VFS,
1366 "Unable to select appropriate authentication method!");
1367 return -EINVAL;
1368 }
1369
1370 switch (type) {
1371 case LANMAN:
1372 /* LANMAN and plaintext are less secure and off by default.
1373 * So we make this explicitly be turned on in kconfig (in the
1374 * build) and turned on at runtime (changed from the default)
1375 * in proc/fs/cifs or via mount parm. Unfortunately this is
1376 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
1377 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1378 sess_data->func = sess_auth_lanman;
1379 break;
1380 #else
1381 return -EOPNOTSUPP;
1382 #endif
1383 case NTLM:
1384 sess_data->func = sess_auth_ntlm;
1385 break;
1386 case NTLMv2:
1387 sess_data->func = sess_auth_ntlmv2;
1388 break;
1389 case Kerberos:
1390 #ifdef CONFIG_CIFS_UPCALL
1391 sess_data->func = sess_auth_kerberos;
1392 break;
1393 #else
1394 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1395 return -ENOSYS;
1396 break;
1397 #endif /* CONFIG_CIFS_UPCALL */
1398 case RawNTLMSSP:
1399 sess_data->func = sess_auth_rawntlmssp_negotiate;
1400 break;
1401 default:
1402 cifs_dbg(VFS, "secType %d not supported!\n", type);
1403 return -ENOSYS;
1404 }
1405
1406 return 0;
1407 }
1408
1409 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1410 const struct nls_table *nls_cp)
1411 {
1412 int rc = 0;
1413 struct sess_data *sess_data;
1414
1415 if (ses == NULL) {
1416 WARN(1, "%s: ses == NULL!", __func__);
1417 return -EINVAL;
1418 }
1419
1420 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1421 if (!sess_data)
1422 return -ENOMEM;
1423
1424 rc = select_sec(ses, sess_data);
1425 if (rc)
1426 goto out;
1427
1428 sess_data->xid = xid;
1429 sess_data->ses = ses;
1430 sess_data->buf0_type = CIFS_NO_BUFFER;
1431 sess_data->nls_cp = (struct nls_table *) nls_cp;
1432
1433 while (sess_data->func)
1434 sess_data->func(sess_data);
1435
1436 /* Store result before we free sess_data */
1437 rc = sess_data->result;
1438
1439 out:
1440 kfree(sess_data);
1441 return rc;
1442 }
Linux kernel - Deliverables
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