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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}