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1/*
2 * fs/cifs/sess.c
3 *
4 * SMB/CIFS session setup handling routines
5 *
6 * Copyright (c) International Business Machines Corp., 2006, 2009
7 * Author(s): Steve French (sfrench@us.ibm.com)
8 *
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24#include "cifspdu.h"
25#include "cifsglob.h"
26#include "cifsproto.h"
27#include "cifs_unicode.h"
28#include "cifs_debug.h"
29#include "ntlmssp.h"
30#include "nterr.h"
31#include <linux/utsname.h>
32#include <linux/slab.h>
33#include "cifs_spnego.h"
34
35static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB)
36{
37 __u32 capabilities = 0;
38
39 /* init fields common to all four types of SessSetup */
40 /* Note that offsets for first seven fields in req struct are same */
41 /* in CIFS Specs so does not matter which of 3 forms of struct */
42 /* that we use in next few lines */
43 /* Note that header is initialized to zero in header_assemble */
44 pSMB->req.AndXCommand = 0xFF;
45 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
46 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
47 USHRT_MAX));
48 pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
49 pSMB->req.VcNumber = __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
80static void
81unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
82{
83 char *bcc_ptr = *pbcc_area;
84 int bytes_ret = 0;
85
86 /* Copy OS version */
87 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
88 nls_cp);
89 bcc_ptr += 2 * bytes_ret;
90 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
91 32, nls_cp);
92 bcc_ptr += 2 * bytes_ret;
93 bcc_ptr += 2; /* trailing null */
94
95 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
96 32, nls_cp);
97 bcc_ptr += 2 * bytes_ret;
98 bcc_ptr += 2; /* trailing null */
99
100 *pbcc_area = bcc_ptr;
101}
102
103static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
104 const struct nls_table *nls_cp)
105{
106 char *bcc_ptr = *pbcc_area;
107 int bytes_ret = 0;
108
109 /* copy domain */
110 if (ses->domainName == NULL) {
111 /* Sending null domain better than using a bogus domain name (as
112 we did briefly in 2.6.18) since server will use its default */
113 *bcc_ptr = 0;
114 *(bcc_ptr+1) = 0;
115 bytes_ret = 0;
116 } else
117 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
118 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
119 bcc_ptr += 2 * bytes_ret;
120 bcc_ptr += 2; /* account for null terminator */
121
122 *pbcc_area = bcc_ptr;
123}
124
125
126static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
127 const struct nls_table *nls_cp)
128{
129 char *bcc_ptr = *pbcc_area;
130 int bytes_ret = 0;
131
132 /* BB FIXME add check that strings total less
133 than 335 or will need to send them as arrays */
134
135 /* unicode strings, must be word aligned before the call */
136/* if ((long) bcc_ptr % 2) {
137 *bcc_ptr = 0;
138 bcc_ptr++;
139 } */
140 /* copy user */
141 if (ses->user_name == NULL) {
142 /* null user mount */
143 *bcc_ptr = 0;
144 *(bcc_ptr+1) = 0;
145 } else {
146 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
147 CIFS_MAX_USERNAME_LEN, nls_cp);
148 }
149 bcc_ptr += 2 * bytes_ret;
150 bcc_ptr += 2; /* account for null termination */
151
152 unicode_domain_string(&bcc_ptr, ses, nls_cp);
153 unicode_oslm_strings(&bcc_ptr, nls_cp);
154
155 *pbcc_area = bcc_ptr;
156}
157
158static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
159 const struct nls_table *nls_cp)
160{
161 char *bcc_ptr = *pbcc_area;
162
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
196static void
197decode_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
230static 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
279int 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 */
333void 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 */
369int 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
468setup_ntlmv2_ret:
469 *buflen = tmp - pbuffer;
470 return rc;
471}
472
473enum securityEnum
474select_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
523int
524CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
525 const struct nls_table *nls_cp)
526{
527 int rc = 0;
528 int wct;
529 struct smb_hdr *smb_buf;
530 char *bcc_ptr;
531 char *str_area;
532 SESSION_SETUP_ANDX *pSMB;
533 __u32 capabilities;
534 __u16 count;
535 int resp_buf_type;
536 struct kvec iov[3];
537 enum securityEnum type;
538 __u16 action, bytes_remaining;
539 struct key *spnego_key = NULL;
540 __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
541 u16 blob_len;
542 char *ntlmsspblob = NULL;
543
544 if (ses == NULL) {
545 WARN(1, "%s: ses == NULL!", __func__);
546 return -EINVAL;
547 }
548
549 type = select_sectype(ses->server, ses->sectype);
550 cifs_dbg(FYI, "sess setup type %d\n", type);
551 if (type == Unspecified) {
552 cifs_dbg(VFS,
553 "Unable to select appropriate authentication method!");
554 return -EINVAL;
555 }
556
557 if (type == RawNTLMSSP) {
558 /* if memory allocation is successful, caller of this function
559 * frees it.
560 */
561 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
562 if (!ses->ntlmssp)
563 return -ENOMEM;
564 ses->ntlmssp->sesskey_per_smbsess = false;
565
566 }
567
568ssetup_ntlmssp_authenticate:
569 if (phase == NtLmChallenge)
570 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
571
572 if (type == LANMAN) {
573#ifndef CONFIG_CIFS_WEAK_PW_HASH
574 /* LANMAN and plaintext are less secure and off by default.
575 So we make this explicitly be turned on in kconfig (in the
576 build) and turned on at runtime (changed from the default)
577 in proc/fs/cifs or via mount parm. Unfortunately this is
578 needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
579 return -EOPNOTSUPP;
580#endif
581 wct = 10; /* lanman 2 style sessionsetup */
582 } else if ((type == NTLM) || (type == NTLMv2)) {
583 /* For NTLMv2 failures eventually may need to retry NTLM */
584 wct = 13; /* old style NTLM sessionsetup */
585 } else /* same size: negotiate or auth, NTLMSSP or extended security */
586 wct = 12;
587
588 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
589 (void **)&smb_buf);
590 if (rc)
591 return rc;
592
593 pSMB = (SESSION_SETUP_ANDX *)smb_buf;
594
595 capabilities = cifs_ssetup_hdr(ses, pSMB);
596
597 /* we will send the SMB in three pieces:
598 a fixed length beginning part, an optional
599 SPNEGO blob (which can be zero length), and a
600 last part which will include the strings
601 and rest of bcc area. This allows us to avoid
602 a large buffer 17K allocation */
603 iov[0].iov_base = (char *)pSMB;
604 iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
605
606 /* setting this here allows the code at the end of the function
607 to free the request buffer if there's an error */
608 resp_buf_type = CIFS_SMALL_BUFFER;
609
610 /* 2000 big enough to fit max user, domain, NOS name etc. */
611 str_area = kmalloc(2000, GFP_KERNEL);
612 if (str_area == NULL) {
613 rc = -ENOMEM;
614 goto ssetup_exit;
615 }
616 bcc_ptr = str_area;
617
618 iov[1].iov_base = NULL;
619 iov[1].iov_len = 0;
620
621 if (type == LANMAN) {
622#ifdef CONFIG_CIFS_WEAK_PW_HASH
623 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
624
625 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
626
627 /* no capabilities flags in old lanman negotiation */
628
629 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
630
631 /* Calculate hash with password and copy into bcc_ptr.
632 * Encryption Key (stored as in cryptkey) gets used if the
633 * security mode bit in Negottiate Protocol response states
634 * to use challenge/response method (i.e. Password bit is 1).
635 */
636
637 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
638 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
639 true : false, lnm_session_key);
640
641 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
642 bcc_ptr += CIFS_AUTH_RESP_SIZE;
643
644 /* can not sign if LANMAN negotiated so no need
645 to calculate signing key? but what if server
646 changed to do higher than lanman dialect and
647 we reconnected would we ever calc signing_key? */
648
649 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
650 /* Unicode not allowed for LANMAN dialects */
651 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
652#endif
653 } else if (type == NTLM) {
654 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
655 pSMB->req_no_secext.CaseInsensitivePasswordLength =
656 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
657 pSMB->req_no_secext.CaseSensitivePasswordLength =
658 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
659
660 /* calculate ntlm response and session key */
661 rc = setup_ntlm_response(ses, nls_cp);
662 if (rc) {
663 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
664 rc);
665 goto ssetup_exit;
666 }
667
668 /* copy ntlm response */
669 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
670 CIFS_AUTH_RESP_SIZE);
671 bcc_ptr += CIFS_AUTH_RESP_SIZE;
672 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
673 CIFS_AUTH_RESP_SIZE);
674 bcc_ptr += CIFS_AUTH_RESP_SIZE;
675
676 if (ses->capabilities & CAP_UNICODE) {
677 /* unicode strings must be word aligned */
678 if (iov[0].iov_len % 2) {
679 *bcc_ptr = 0;
680 bcc_ptr++;
681 }
682 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
683 } else
684 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
685 } else if (type == NTLMv2) {
686 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
687
688 /* LM2 password would be here if we supported it */
689 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
690
691 /* calculate nlmv2 response and session key */
692 rc = setup_ntlmv2_rsp(ses, nls_cp);
693 if (rc) {
694 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n",
695 rc);
696 goto ssetup_exit;
697 }
698 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
699 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
700 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
701
702 /* set case sensitive password length after tilen may get
703 * assigned, tilen is 0 otherwise.
704 */
705 pSMB->req_no_secext.CaseSensitivePasswordLength =
706 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
707
708 if (ses->capabilities & CAP_UNICODE) {
709 if (iov[0].iov_len % 2) {
710 *bcc_ptr = 0;
711 bcc_ptr++;
712 }
713 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
714 } else
715 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
716 } else if (type == Kerberos) {
717#ifdef CONFIG_CIFS_UPCALL
718 struct cifs_spnego_msg *msg;
719
720 spnego_key = cifs_get_spnego_key(ses);
721 if (IS_ERR(spnego_key)) {
722 rc = PTR_ERR(spnego_key);
723 spnego_key = NULL;
724 goto ssetup_exit;
725 }
726
727 msg = spnego_key->payload.data;
728 /* check version field to make sure that cifs.upcall is
729 sending us a response in an expected form */
730 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
731 cifs_dbg(VFS, "incorrect version of cifs.upcall "
732 "expected %d but got %d)",
733 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
734 rc = -EKEYREJECTED;
735 goto ssetup_exit;
736 }
737
738 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
739 GFP_KERNEL);
740 if (!ses->auth_key.response) {
741 cifs_dbg(VFS,
742 "Kerberos can't allocate (%u bytes) memory",
743 msg->sesskey_len);
744 rc = -ENOMEM;
745 goto ssetup_exit;
746 }
747 ses->auth_key.len = msg->sesskey_len;
748
749 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
750 capabilities |= CAP_EXTENDED_SECURITY;
751 pSMB->req.Capabilities = cpu_to_le32(capabilities);
752 iov[1].iov_base = msg->data + msg->sesskey_len;
753 iov[1].iov_len = msg->secblob_len;
754 pSMB->req.SecurityBlobLength = cpu_to_le16(iov[1].iov_len);
755
756 if (ses->capabilities & CAP_UNICODE) {
757 /* unicode strings must be word aligned */
758 if ((iov[0].iov_len + iov[1].iov_len) % 2) {
759 *bcc_ptr = 0;
760 bcc_ptr++;
761 }
762 unicode_oslm_strings(&bcc_ptr, nls_cp);
763 unicode_domain_string(&bcc_ptr, ses, nls_cp);
764 } else
765 /* BB: is this right? */
766 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
767#else /* ! CONFIG_CIFS_UPCALL */
768 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
769 rc = -ENOSYS;
770 goto ssetup_exit;
771#endif /* CONFIG_CIFS_UPCALL */
772 } else if (type == RawNTLMSSP) {
773 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
774 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
775 rc = -ENOSYS;
776 goto ssetup_exit;
777 }
778
779 cifs_dbg(FYI, "ntlmssp session setup phase %d\n", phase);
780 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
781 capabilities |= CAP_EXTENDED_SECURITY;
782 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
783 switch(phase) {
784 case NtLmNegotiate:
785 build_ntlmssp_negotiate_blob(
786 pSMB->req.SecurityBlob, ses);
787 iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
788 iov[1].iov_base = pSMB->req.SecurityBlob;
789 pSMB->req.SecurityBlobLength =
790 cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
791 break;
792 case NtLmAuthenticate:
793 /*
794 * 5 is an empirical value, large enough to hold
795 * authenticate message plus max 10 of av paris,
796 * domain, user, workstation names, flags, etc.
797 */
798 ntlmsspblob = kzalloc(
799 5*sizeof(struct _AUTHENTICATE_MESSAGE),
800 GFP_KERNEL);
801 if (!ntlmsspblob) {
802 rc = -ENOMEM;
803 goto ssetup_exit;
804 }
805
806 rc = build_ntlmssp_auth_blob(ntlmsspblob,
807 &blob_len, ses, nls_cp);
808 if (rc)
809 goto ssetup_exit;
810 iov[1].iov_len = blob_len;
811 iov[1].iov_base = ntlmsspblob;
812 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
813 /*
814 * Make sure that we tell the server that we are using
815 * the uid that it just gave us back on the response
816 * (challenge)
817 */
818 smb_buf->Uid = ses->Suid;
819 break;
820 default:
821 cifs_dbg(VFS, "invalid phase %d\n", phase);
822 rc = -ENOSYS;
823 goto ssetup_exit;
824 }
825 /* unicode strings must be word aligned */
826 if ((iov[0].iov_len + iov[1].iov_len) % 2) {
827 *bcc_ptr = 0;
828 bcc_ptr++;
829 }
830 unicode_oslm_strings(&bcc_ptr, nls_cp);
831 } else {
832 cifs_dbg(VFS, "secType %d not supported!\n", type);
833 rc = -ENOSYS;
834 goto ssetup_exit;
835 }
836
837 iov[2].iov_base = str_area;
838 iov[2].iov_len = (long) bcc_ptr - (long) str_area;
839
840 count = iov[1].iov_len + iov[2].iov_len;
841 smb_buf->smb_buf_length =
842 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
843
844 put_bcc(count, smb_buf);
845
846 rc = SendReceive2(xid, ses, iov, 3 /* num_iovecs */, &resp_buf_type,
847 CIFS_LOG_ERROR);
848 /* SMB request buf freed in SendReceive2 */
849
850 pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base;
851 smb_buf = (struct smb_hdr *)iov[0].iov_base;
852
853 if ((type == RawNTLMSSP) && (resp_buf_type != CIFS_NO_BUFFER) &&
854 (smb_buf->Status.CifsError ==
855 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))) {
856 if (phase != NtLmNegotiate) {
857 cifs_dbg(VFS, "Unexpected more processing error\n");
858 goto ssetup_exit;
859 }
860 /* NTLMSSP Negotiate sent now processing challenge (response) */
861 phase = NtLmChallenge; /* process ntlmssp challenge */
862 rc = 0; /* MORE_PROC rc is not an error here, but expected */
863 }
864 if (rc)
865 goto ssetup_exit;
866
867 if ((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) {
868 rc = -EIO;
869 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
870 goto ssetup_exit;
871 }
872 action = le16_to_cpu(pSMB->resp.Action);
873 if (action & GUEST_LOGIN)
874 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
875 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
876 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
877 /* response can have either 3 or 4 word count - Samba sends 3 */
878 /* and lanman response is 3 */
879 bytes_remaining = get_bcc(smb_buf);
880 bcc_ptr = pByteArea(smb_buf);
881
882 if (smb_buf->WordCount == 4) {
883 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
884 if (blob_len > bytes_remaining) {
885 cifs_dbg(VFS, "bad security blob length %d\n",
886 blob_len);
887 rc = -EINVAL;
888 goto ssetup_exit;
889 }
890 if (phase == NtLmChallenge) {
891 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
892 /* now goto beginning for ntlmssp authenticate phase */
893 if (rc)
894 goto ssetup_exit;
895 }
896 bcc_ptr += blob_len;
897 bytes_remaining -= blob_len;
898 }
899
900 /* BB check if Unicode and decode strings */
901 if (bytes_remaining == 0) {
902 /* no string area to decode, do nothing */
903 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
904 /* unicode string area must be word-aligned */
905 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
906 ++bcc_ptr;
907 --bytes_remaining;
908 }
909 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, nls_cp);
910 } else {
911 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, nls_cp);
912 }
913
914ssetup_exit:
915 if (spnego_key) {
916 key_invalidate(spnego_key);
917 key_put(spnego_key);
918 }
919 kfree(str_area);
920 kfree(ntlmsspblob);
921 ntlmsspblob = NULL;
922 if (resp_buf_type == CIFS_SMALL_BUFFER) {
923 cifs_dbg(FYI, "ssetup freeing small buf %p\n", iov[0].iov_base);
924 cifs_small_buf_release(iov[0].iov_base);
925 } else if (resp_buf_type == CIFS_LARGE_BUFFER)
926 cifs_buf_release(iov[0].iov_base);
927
928 /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
929 if ((phase == NtLmChallenge) && (rc == 0))
930 goto ssetup_ntlmssp_authenticate;
931
932 if (!rc) {
933 mutex_lock(&ses->server->srv_mutex);
934 if (!ses->server->session_estab) {
935 if (ses->server->sign) {
936 ses->server->session_key.response =
937 kmemdup(ses->auth_key.response,
938 ses->auth_key.len, GFP_KERNEL);
939 if (!ses->server->session_key.response) {
940 rc = -ENOMEM;
941 mutex_unlock(&ses->server->srv_mutex);
942 goto keycp_exit;
943 }
944 ses->server->session_key.len =
945 ses->auth_key.len;
946 }
947 ses->server->sequence_number = 0x2;
948 ses->server->session_estab = true;
949 }
950 mutex_unlock(&ses->server->srv_mutex);
951
952 cifs_dbg(FYI, "CIFS session established successfully\n");
953 spin_lock(&GlobalMid_Lock);
954 ses->status = CifsGood;
955 ses->need_reconnect = false;
956 spin_unlock(&GlobalMid_Lock);
957 }
958
959keycp_exit:
960 kfree(ses->auth_key.response);
961 ses->auth_key.response = NULL;
962 kfree(ses->ntlmssp);
963
964 return rc;
965}
1/*
2 * fs/cifs/sess.c
3 *
4 * SMB/CIFS session setup handling routines
5 *
6 * Copyright (c) International Business Machines Corp., 2006, 2009
7 * Author(s): Steve French (sfrench@us.ibm.com)
8 *
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24#include "cifspdu.h"
25#include "cifsglob.h"
26#include "cifsproto.h"
27#include "cifs_unicode.h"
28#include "cifs_debug.h"
29#include "ntlmssp.h"
30#include "nterr.h"
31#include <linux/utsname.h>
32#include <linux/slab.h>
33#include "cifs_spnego.h"
34
35static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB)
36{
37 __u32 capabilities = 0;
38
39 /* init fields common to all four types of SessSetup */
40 /* Note that offsets for first seven fields in req struct are same */
41 /* in CIFS Specs so does not matter which of 3 forms of struct */
42 /* that we use in next few lines */
43 /* Note that header is initialized to zero in header_assemble */
44 pSMB->req.AndXCommand = 0xFF;
45 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
46 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
47 USHRT_MAX));
48 pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
49 pSMB->req.VcNumber = cpu_to_le16(1);
50
51 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
52
53 /* BB verify whether signing required on neg or just on auth frame
54 (and NTLM case) */
55
56 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
57 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
58
59 if (ses->server->sign)
60 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
61
62 if (ses->capabilities & CAP_UNICODE) {
63 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
64 capabilities |= CAP_UNICODE;
65 }
66 if (ses->capabilities & CAP_STATUS32) {
67 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
68 capabilities |= CAP_STATUS32;
69 }
70 if (ses->capabilities & CAP_DFS) {
71 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
72 capabilities |= CAP_DFS;
73 }
74 if (ses->capabilities & CAP_UNIX)
75 capabilities |= CAP_UNIX;
76
77 return capabilities;
78}
79
80static void
81unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
82{
83 char *bcc_ptr = *pbcc_area;
84 int bytes_ret = 0;
85
86 /* Copy OS version */
87 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
88 nls_cp);
89 bcc_ptr += 2 * bytes_ret;
90 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
91 32, nls_cp);
92 bcc_ptr += 2 * bytes_ret;
93 bcc_ptr += 2; /* trailing null */
94
95 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
96 32, nls_cp);
97 bcc_ptr += 2 * bytes_ret;
98 bcc_ptr += 2; /* trailing null */
99
100 *pbcc_area = bcc_ptr;
101}
102
103static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
104 const struct nls_table *nls_cp)
105{
106 char *bcc_ptr = *pbcc_area;
107 int bytes_ret = 0;
108
109 /* copy domain */
110 if (ses->domainName == NULL) {
111 /* Sending null domain better than using a bogus domain name (as
112 we did briefly in 2.6.18) since server will use its default */
113 *bcc_ptr = 0;
114 *(bcc_ptr+1) = 0;
115 bytes_ret = 0;
116 } else
117 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
118 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
119 bcc_ptr += 2 * bytes_ret;
120 bcc_ptr += 2; /* account for null terminator */
121
122 *pbcc_area = bcc_ptr;
123}
124
125
126static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
127 const struct nls_table *nls_cp)
128{
129 char *bcc_ptr = *pbcc_area;
130 int bytes_ret = 0;
131
132 /* BB FIXME add check that strings total less
133 than 335 or will need to send them as arrays */
134
135 /* unicode strings, must be word aligned before the call */
136/* if ((long) bcc_ptr % 2) {
137 *bcc_ptr = 0;
138 bcc_ptr++;
139 } */
140 /* copy user */
141 if (ses->user_name == NULL) {
142 /* null user mount */
143 *bcc_ptr = 0;
144 *(bcc_ptr+1) = 0;
145 } else {
146 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
147 CIFS_MAX_USERNAME_LEN, nls_cp);
148 }
149 bcc_ptr += 2 * bytes_ret;
150 bcc_ptr += 2; /* account for null termination */
151
152 unicode_domain_string(&bcc_ptr, ses, nls_cp);
153 unicode_oslm_strings(&bcc_ptr, nls_cp);
154
155 *pbcc_area = bcc_ptr;
156}
157
158static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
159 const struct nls_table *nls_cp)
160{
161 char *bcc_ptr = *pbcc_area;
162
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
196static void
197decode_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
230static 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
280int 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 */
334void 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
366static 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
384int 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;
496setup_ntlmv2_ret:
497 return rc;
498}
499
500enum securityEnum
501cifs_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
550struct 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
568static int
569sess_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
598out_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
606static void
607sess_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
615static int
616sess_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
647static int
648sess_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
678static void
679sess_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);
777out:
778 sess_data->result = rc;
779 sess_data->func = NULL;
780 sess_free_buffer(sess_data);
781}
782
783#endif
784
785static void
786sess_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);
887out:
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
895static void
896sess_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);
995out:
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
1004static void
1005sess_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);
1131out_put_spnego_key:
1132 key_invalidate(spnego_key);
1133 key_put(spnego_key);
1134out:
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 */
1148static 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
1184static void
1185sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1186
1187static void
1188sess_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);
1265out:
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
1283static void
1284sess_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
1372out_free_ntlmsspblob:
1373 kfree(ntlmsspblob);
1374out:
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
1390static 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
1441int 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
1471out:
1472 kfree(sess_data);
1473 return rc;
1474}