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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#include "smb2proto.h"
35
36bool
37is_server_using_iface(struct TCP_Server_Info *server,
38 struct cifs_server_iface *iface)
39{
40 struct sockaddr_in *i4 = (struct sockaddr_in *)&iface->sockaddr;
41 struct sockaddr_in6 *i6 = (struct sockaddr_in6 *)&iface->sockaddr;
42 struct sockaddr_in *s4 = (struct sockaddr_in *)&server->dstaddr;
43 struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)&server->dstaddr;
44
45 if (server->dstaddr.ss_family != iface->sockaddr.ss_family)
46 return false;
47 if (server->dstaddr.ss_family == AF_INET) {
48 if (s4->sin_addr.s_addr != i4->sin_addr.s_addr)
49 return false;
50 } else if (server->dstaddr.ss_family == AF_INET6) {
51 if (memcmp(&s6->sin6_addr, &i6->sin6_addr,
52 sizeof(i6->sin6_addr)) != 0)
53 return false;
54 } else {
55 /* unknown family.. */
56 return false;
57 }
58 return true;
59}
60
61bool is_ses_using_iface(struct cifs_ses *ses, struct cifs_server_iface *iface)
62{
63 int i;
64
65 for (i = 0; i < ses->chan_count; i++) {
66 if (is_server_using_iface(ses->chans[i].server, iface))
67 return true;
68 }
69 return false;
70}
71
72/* returns number of channels added */
73int cifs_try_adding_channels(struct cifs_ses *ses)
74{
75 int old_chan_count = ses->chan_count;
76 int left = ses->chan_max - ses->chan_count;
77 int i = 0;
78 int rc = 0;
79 int tries = 0;
80 struct cifs_server_iface *ifaces = NULL;
81 size_t iface_count;
82
83 if (left <= 0) {
84 cifs_dbg(FYI,
85 "ses already at max_channels (%zu), nothing to open\n",
86 ses->chan_max);
87 return 0;
88 }
89
90 if (ses->server->dialect < SMB30_PROT_ID) {
91 cifs_dbg(VFS, "multichannel is not supported on this protocol version, use 3.0 or above\n");
92 return 0;
93 }
94
95 /*
96 * Make a copy of the iface list at the time and use that
97 * instead so as to not hold the iface spinlock for opening
98 * channels
99 */
100 spin_lock(&ses->iface_lock);
101 iface_count = ses->iface_count;
102 if (iface_count <= 0) {
103 spin_unlock(&ses->iface_lock);
104 cifs_dbg(VFS, "no iface list available to open channels\n");
105 return 0;
106 }
107 ifaces = kmemdup(ses->iface_list, iface_count*sizeof(*ifaces),
108 GFP_ATOMIC);
109 if (!ifaces) {
110 spin_unlock(&ses->iface_lock);
111 return 0;
112 }
113 spin_unlock(&ses->iface_lock);
114
115 /*
116 * Keep connecting to same, fastest, iface for all channels as
117 * long as its RSS. Try next fastest one if not RSS or channel
118 * creation fails.
119 */
120 while (left > 0) {
121 struct cifs_server_iface *iface;
122
123 tries++;
124 if (tries > 3*ses->chan_max) {
125 cifs_dbg(FYI, "too many channel open attempts (%d channels left to open)\n",
126 left);
127 break;
128 }
129
130 iface = &ifaces[i];
131 if (is_ses_using_iface(ses, iface) && !iface->rss_capable) {
132 i = (i+1) % iface_count;
133 continue;
134 }
135
136 rc = cifs_ses_add_channel(ses, iface);
137 if (rc) {
138 cifs_dbg(FYI, "failed to open extra channel on iface#%d rc=%d\n",
139 i, rc);
140 i = (i+1) % iface_count;
141 continue;
142 }
143
144 cifs_dbg(FYI, "successfully opened new channel on iface#%d\n",
145 i);
146 left--;
147 }
148
149 kfree(ifaces);
150 return ses->chan_count - old_chan_count;
151}
152
153/*
154 * If server is a channel of ses, return the corresponding enclosing
155 * cifs_chan otherwise return NULL.
156 */
157struct cifs_chan *
158cifs_ses_find_chan(struct cifs_ses *ses, struct TCP_Server_Info *server)
159{
160 int i;
161
162 for (i = 0; i < ses->chan_count; i++) {
163 if (ses->chans[i].server == server)
164 return &ses->chans[i];
165 }
166 return NULL;
167}
168
169int
170cifs_ses_add_channel(struct cifs_ses *ses, struct cifs_server_iface *iface)
171{
172 struct cifs_chan *chan;
173 struct smb_vol vol = {NULL};
174 static const char unc_fmt[] = "\\%s\\foo";
175 char unc[sizeof(unc_fmt)+SERVER_NAME_LEN_WITH_NULL] = {0};
176 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;
177 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;
178 int rc;
179 unsigned int xid = get_xid();
180
181 if (iface->sockaddr.ss_family == AF_INET)
182 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI4)\n",
183 ses, iface->speed, iface->rdma_capable ? "yes" : "no",
184 &ipv4->sin_addr);
185 else
186 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI4)\n",
187 ses, iface->speed, iface->rdma_capable ? "yes" : "no",
188 &ipv6->sin6_addr);
189
190 /*
191 * Setup a smb_vol with mostly the same info as the existing
192 * session and overwrite it with the requested iface data.
193 *
194 * We need to setup at least the fields used for negprot and
195 * sesssetup.
196 *
197 * We only need the volume here, so we can reuse memory from
198 * the session and server without caring about memory
199 * management.
200 */
201
202 /* Always make new connection for now (TODO?) */
203 vol.nosharesock = true;
204
205 /* Auth */
206 vol.domainauto = ses->domainAuto;
207 vol.domainname = ses->domainName;
208 vol.username = ses->user_name;
209 vol.password = ses->password;
210 vol.sectype = ses->sectype;
211 vol.sign = ses->sign;
212
213 /* UNC and paths */
214 /* XXX: Use ses->server->hostname? */
215 sprintf(unc, unc_fmt, ses->serverName);
216 vol.UNC = unc;
217 vol.prepath = "";
218
219 /* Reuse same version as master connection */
220 vol.vals = ses->server->vals;
221 vol.ops = ses->server->ops;
222
223 vol.noblocksnd = ses->server->noblocksnd;
224 vol.noautotune = ses->server->noautotune;
225 vol.sockopt_tcp_nodelay = ses->server->tcp_nodelay;
226 vol.echo_interval = ses->server->echo_interval / HZ;
227
228 /*
229 * This will be used for encoding/decoding user/domain/pw
230 * during sess setup auth.
231 *
232 * XXX: We use the default for simplicity but the proper way
233 * would be to use the one that ses used, which is not
234 * stored. This might break when dealing with non-ascii
235 * strings.
236 */
237 vol.local_nls = load_nls_default();
238
239 /* Use RDMA if possible */
240 vol.rdma = iface->rdma_capable;
241 memcpy(&vol.dstaddr, &iface->sockaddr, sizeof(struct sockaddr_storage));
242
243 /* reuse master con client guid */
244 memcpy(&vol.client_guid, ses->server->client_guid,
245 SMB2_CLIENT_GUID_SIZE);
246 vol.use_client_guid = true;
247
248 mutex_lock(&ses->session_mutex);
249
250 chan = ses->binding_chan = &ses->chans[ses->chan_count];
251 chan->server = cifs_get_tcp_session(&vol);
252 if (IS_ERR(chan->server)) {
253 rc = PTR_ERR(chan->server);
254 chan->server = NULL;
255 goto out;
256 }
257 spin_lock(&cifs_tcp_ses_lock);
258 chan->server->is_channel = true;
259 spin_unlock(&cifs_tcp_ses_lock);
260
261 /*
262 * We need to allocate the server crypto now as we will need
263 * to sign packets before we generate the channel signing key
264 * (we sign with the session key)
265 */
266 rc = smb311_crypto_shash_allocate(chan->server);
267 if (rc) {
268 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
269 goto out;
270 }
271
272 ses->binding = true;
273 rc = cifs_negotiate_protocol(xid, ses);
274 if (rc)
275 goto out;
276
277 rc = cifs_setup_session(xid, ses, vol.local_nls);
278 if (rc)
279 goto out;
280
281 /* success, put it on the list
282 * XXX: sharing ses between 2 tcp servers is not possible, the
283 * way "internal" linked lists works in linux makes element
284 * only able to belong to one list
285 *
286 * the binding session is already established so the rest of
287 * the code should be able to look it up, no need to add the
288 * ses to the new server.
289 */
290
291 ses->chan_count++;
292 atomic_set(&ses->chan_seq, 0);
293out:
294 ses->binding = false;
295 ses->binding_chan = NULL;
296 mutex_unlock(&ses->session_mutex);
297
298 if (rc && chan->server)
299 cifs_put_tcp_session(chan->server, 0);
300 unload_nls(vol.local_nls);
301
302 return rc;
303}
304
305static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB)
306{
307 __u32 capabilities = 0;
308
309 /* init fields common to all four types of SessSetup */
310 /* Note that offsets for first seven fields in req struct are same */
311 /* in CIFS Specs so does not matter which of 3 forms of struct */
312 /* that we use in next few lines */
313 /* Note that header is initialized to zero in header_assemble */
314 pSMB->req.AndXCommand = 0xFF;
315 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
316 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
317 USHRT_MAX));
318 pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
319 pSMB->req.VcNumber = cpu_to_le16(1);
320
321 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
322
323 /* BB verify whether signing required on neg or just on auth frame
324 (and NTLM case) */
325
326 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
327 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
328
329 if (ses->server->sign)
330 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
331
332 if (ses->capabilities & CAP_UNICODE) {
333 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
334 capabilities |= CAP_UNICODE;
335 }
336 if (ses->capabilities & CAP_STATUS32) {
337 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
338 capabilities |= CAP_STATUS32;
339 }
340 if (ses->capabilities & CAP_DFS) {
341 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
342 capabilities |= CAP_DFS;
343 }
344 if (ses->capabilities & CAP_UNIX)
345 capabilities |= CAP_UNIX;
346
347 return capabilities;
348}
349
350static void
351unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
352{
353 char *bcc_ptr = *pbcc_area;
354 int bytes_ret = 0;
355
356 /* Copy OS version */
357 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
358 nls_cp);
359 bcc_ptr += 2 * bytes_ret;
360 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
361 32, nls_cp);
362 bcc_ptr += 2 * bytes_ret;
363 bcc_ptr += 2; /* trailing null */
364
365 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
366 32, nls_cp);
367 bcc_ptr += 2 * bytes_ret;
368 bcc_ptr += 2; /* trailing null */
369
370 *pbcc_area = bcc_ptr;
371}
372
373static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
374 const struct nls_table *nls_cp)
375{
376 char *bcc_ptr = *pbcc_area;
377 int bytes_ret = 0;
378
379 /* copy domain */
380 if (ses->domainName == NULL) {
381 /* Sending null domain better than using a bogus domain name (as
382 we did briefly in 2.6.18) since server will use its default */
383 *bcc_ptr = 0;
384 *(bcc_ptr+1) = 0;
385 bytes_ret = 0;
386 } else
387 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
388 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
389 bcc_ptr += 2 * bytes_ret;
390 bcc_ptr += 2; /* account for null terminator */
391
392 *pbcc_area = bcc_ptr;
393}
394
395
396static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
397 const struct nls_table *nls_cp)
398{
399 char *bcc_ptr = *pbcc_area;
400 int bytes_ret = 0;
401
402 /* BB FIXME add check that strings total less
403 than 335 or will need to send them as arrays */
404
405 /* unicode strings, must be word aligned before the call */
406/* if ((long) bcc_ptr % 2) {
407 *bcc_ptr = 0;
408 bcc_ptr++;
409 } */
410 /* copy user */
411 if (ses->user_name == NULL) {
412 /* null user mount */
413 *bcc_ptr = 0;
414 *(bcc_ptr+1) = 0;
415 } else {
416 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
417 CIFS_MAX_USERNAME_LEN, nls_cp);
418 }
419 bcc_ptr += 2 * bytes_ret;
420 bcc_ptr += 2; /* account for null termination */
421
422 unicode_domain_string(&bcc_ptr, ses, nls_cp);
423 unicode_oslm_strings(&bcc_ptr, nls_cp);
424
425 *pbcc_area = bcc_ptr;
426}
427
428static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
429 const struct nls_table *nls_cp)
430{
431 char *bcc_ptr = *pbcc_area;
432 int len;
433
434 /* copy user */
435 /* BB what about null user mounts - check that we do this BB */
436 /* copy user */
437 if (ses->user_name != NULL) {
438 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
439 if (WARN_ON_ONCE(len < 0))
440 len = CIFS_MAX_USERNAME_LEN - 1;
441 bcc_ptr += len;
442 }
443 /* else null user mount */
444 *bcc_ptr = 0;
445 bcc_ptr++; /* account for null termination */
446
447 /* copy domain */
448 if (ses->domainName != NULL) {
449 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
450 if (WARN_ON_ONCE(len < 0))
451 len = CIFS_MAX_DOMAINNAME_LEN - 1;
452 bcc_ptr += len;
453 } /* else we will send a null domain name
454 so the server will default to its own domain */
455 *bcc_ptr = 0;
456 bcc_ptr++;
457
458 /* BB check for overflow here */
459
460 strcpy(bcc_ptr, "Linux version ");
461 bcc_ptr += strlen("Linux version ");
462 strcpy(bcc_ptr, init_utsname()->release);
463 bcc_ptr += strlen(init_utsname()->release) + 1;
464
465 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
466 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
467
468 *pbcc_area = bcc_ptr;
469}
470
471static void
472decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
473 const struct nls_table *nls_cp)
474{
475 int len;
476 char *data = *pbcc_area;
477
478 cifs_dbg(FYI, "bleft %d\n", bleft);
479
480 kfree(ses->serverOS);
481 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
482 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
483 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
484 data += len;
485 bleft -= len;
486 if (bleft <= 0)
487 return;
488
489 kfree(ses->serverNOS);
490 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
491 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
492 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
493 data += len;
494 bleft -= len;
495 if (bleft <= 0)
496 return;
497
498 kfree(ses->serverDomain);
499 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
500 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
501
502 return;
503}
504
505static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
506 struct cifs_ses *ses,
507 const struct nls_table *nls_cp)
508{
509 int len;
510 char *bcc_ptr = *pbcc_area;
511
512 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
513
514 len = strnlen(bcc_ptr, bleft);
515 if (len >= bleft)
516 return;
517
518 kfree(ses->serverOS);
519
520 ses->serverOS = kmalloc(len + 1, GFP_KERNEL);
521 if (ses->serverOS) {
522 memcpy(ses->serverOS, bcc_ptr, len);
523 ses->serverOS[len] = 0;
524 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
525 cifs_dbg(FYI, "OS/2 server\n");
526 }
527
528 bcc_ptr += len + 1;
529 bleft -= len + 1;
530
531 len = strnlen(bcc_ptr, bleft);
532 if (len >= bleft)
533 return;
534
535 kfree(ses->serverNOS);
536
537 ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);
538 if (ses->serverNOS) {
539 memcpy(ses->serverNOS, bcc_ptr, len);
540 ses->serverNOS[len] = 0;
541 }
542
543 bcc_ptr += len + 1;
544 bleft -= len + 1;
545
546 len = strnlen(bcc_ptr, bleft);
547 if (len > bleft)
548 return;
549
550 /* No domain field in LANMAN case. Domain is
551 returned by old servers in the SMB negprot response */
552 /* BB For newer servers which do not support Unicode,
553 but thus do return domain here we could add parsing
554 for it later, but it is not very important */
555 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
556}
557
558int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
559 struct cifs_ses *ses)
560{
561 unsigned int tioffset; /* challenge message target info area */
562 unsigned int tilen; /* challenge message target info area length */
563
564 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
565
566 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
567 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
568 return -EINVAL;
569 }
570
571 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
572 cifs_dbg(VFS, "blob signature incorrect %s\n",
573 pblob->Signature);
574 return -EINVAL;
575 }
576 if (pblob->MessageType != NtLmChallenge) {
577 cifs_dbg(VFS, "Incorrect message type %d\n",
578 pblob->MessageType);
579 return -EINVAL;
580 }
581
582 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
583 /* BB we could decode pblob->NegotiateFlags; some may be useful */
584 /* In particular we can examine sign flags */
585 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
586 we must set the MIC field of the AUTHENTICATE_MESSAGE */
587 ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags);
588 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
589 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
590 if (tioffset > blob_len || tioffset + tilen > blob_len) {
591 cifs_dbg(VFS, "tioffset + tilen too high %u + %u\n",
592 tioffset, tilen);
593 return -EINVAL;
594 }
595 if (tilen) {
596 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
597 GFP_KERNEL);
598 if (!ses->auth_key.response) {
599 cifs_dbg(VFS, "Challenge target info alloc failure\n");
600 return -ENOMEM;
601 }
602 ses->auth_key.len = tilen;
603 }
604
605 return 0;
606}
607
608/* BB Move to ntlmssp.c eventually */
609
610/* We do not malloc the blob, it is passed in pbuffer, because
611 it is fixed size, and small, making this approach cleaner */
612void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
613 struct cifs_ses *ses)
614{
615 struct TCP_Server_Info *server = cifs_ses_server(ses);
616 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer;
617 __u32 flags;
618
619 memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
620 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
621 sec_blob->MessageType = NtLmNegotiate;
622
623 /* BB is NTLMV2 session security format easier to use here? */
624 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
625 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
626 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
627 NTLMSSP_NEGOTIATE_SEAL;
628 if (server->sign)
629 flags |= NTLMSSP_NEGOTIATE_SIGN;
630 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
631 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
632
633 sec_blob->NegotiateFlags = cpu_to_le32(flags);
634
635 sec_blob->WorkstationName.BufferOffset = 0;
636 sec_blob->WorkstationName.Length = 0;
637 sec_blob->WorkstationName.MaximumLength = 0;
638
639 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
640 sec_blob->DomainName.BufferOffset = 0;
641 sec_blob->DomainName.Length = 0;
642 sec_blob->DomainName.MaximumLength = 0;
643}
644
645static int size_of_ntlmssp_blob(struct cifs_ses *ses)
646{
647 int sz = sizeof(AUTHENTICATE_MESSAGE) + ses->auth_key.len
648 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
649
650 if (ses->domainName)
651 sz += 2 * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
652 else
653 sz += 2;
654
655 if (ses->user_name)
656 sz += 2 * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
657 else
658 sz += 2;
659
660 return sz;
661}
662
663int build_ntlmssp_auth_blob(unsigned char **pbuffer,
664 u16 *buflen,
665 struct cifs_ses *ses,
666 const struct nls_table *nls_cp)
667{
668 int rc;
669 AUTHENTICATE_MESSAGE *sec_blob;
670 __u32 flags;
671 unsigned char *tmp;
672
673 rc = setup_ntlmv2_rsp(ses, nls_cp);
674 if (rc) {
675 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
676 *buflen = 0;
677 goto setup_ntlmv2_ret;
678 }
679 *pbuffer = kmalloc(size_of_ntlmssp_blob(ses), GFP_KERNEL);
680 if (!*pbuffer) {
681 rc = -ENOMEM;
682 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
683 *buflen = 0;
684 goto setup_ntlmv2_ret;
685 }
686 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
687
688 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
689 sec_blob->MessageType = NtLmAuthenticate;
690
691 flags = NTLMSSP_NEGOTIATE_56 |
692 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
693 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
694 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
695 NTLMSSP_NEGOTIATE_SEAL;
696 if (ses->server->sign)
697 flags |= NTLMSSP_NEGOTIATE_SIGN;
698 if (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
699 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
700
701 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
702 sec_blob->NegotiateFlags = cpu_to_le32(flags);
703
704 sec_blob->LmChallengeResponse.BufferOffset =
705 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
706 sec_blob->LmChallengeResponse.Length = 0;
707 sec_blob->LmChallengeResponse.MaximumLength = 0;
708
709 sec_blob->NtChallengeResponse.BufferOffset =
710 cpu_to_le32(tmp - *pbuffer);
711 if (ses->user_name != NULL) {
712 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
713 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
714 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
715
716 sec_blob->NtChallengeResponse.Length =
717 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
718 sec_blob->NtChallengeResponse.MaximumLength =
719 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
720 } else {
721 /*
722 * don't send an NT Response for anonymous access
723 */
724 sec_blob->NtChallengeResponse.Length = 0;
725 sec_blob->NtChallengeResponse.MaximumLength = 0;
726 }
727
728 if (ses->domainName == NULL) {
729 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
730 sec_blob->DomainName.Length = 0;
731 sec_blob->DomainName.MaximumLength = 0;
732 tmp += 2;
733 } else {
734 int len;
735 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
736 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
737 len *= 2; /* unicode is 2 bytes each */
738 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
739 sec_blob->DomainName.Length = cpu_to_le16(len);
740 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
741 tmp += len;
742 }
743
744 if (ses->user_name == NULL) {
745 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
746 sec_blob->UserName.Length = 0;
747 sec_blob->UserName.MaximumLength = 0;
748 tmp += 2;
749 } else {
750 int len;
751 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
752 CIFS_MAX_USERNAME_LEN, nls_cp);
753 len *= 2; /* unicode is 2 bytes each */
754 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
755 sec_blob->UserName.Length = cpu_to_le16(len);
756 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
757 tmp += len;
758 }
759
760 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
761 sec_blob->WorkstationName.Length = 0;
762 sec_blob->WorkstationName.MaximumLength = 0;
763 tmp += 2;
764
765 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
766 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
767 && !calc_seckey(ses)) {
768 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
769 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
770 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
771 sec_blob->SessionKey.MaximumLength =
772 cpu_to_le16(CIFS_CPHTXT_SIZE);
773 tmp += CIFS_CPHTXT_SIZE;
774 } else {
775 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
776 sec_blob->SessionKey.Length = 0;
777 sec_blob->SessionKey.MaximumLength = 0;
778 }
779
780 *buflen = tmp - *pbuffer;
781setup_ntlmv2_ret:
782 return rc;
783}
784
785enum securityEnum
786cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
787{
788 switch (server->negflavor) {
789 case CIFS_NEGFLAVOR_EXTENDED:
790 switch (requested) {
791 case Kerberos:
792 case RawNTLMSSP:
793 return requested;
794 case Unspecified:
795 if (server->sec_ntlmssp &&
796 (global_secflags & CIFSSEC_MAY_NTLMSSP))
797 return RawNTLMSSP;
798 if ((server->sec_kerberos || server->sec_mskerberos) &&
799 (global_secflags & CIFSSEC_MAY_KRB5))
800 return Kerberos;
801 fallthrough;
802 default:
803 return Unspecified;
804 }
805 case CIFS_NEGFLAVOR_UNENCAP:
806 switch (requested) {
807 case NTLM:
808 case NTLMv2:
809 return requested;
810 case Unspecified:
811 if (global_secflags & CIFSSEC_MAY_NTLMV2)
812 return NTLMv2;
813 if (global_secflags & CIFSSEC_MAY_NTLM)
814 return NTLM;
815 default:
816 break;
817 }
818 fallthrough; /* to attempt LANMAN authentication next */
819 case CIFS_NEGFLAVOR_LANMAN:
820 switch (requested) {
821 case LANMAN:
822 return requested;
823 case Unspecified:
824 if (global_secflags & CIFSSEC_MAY_LANMAN)
825 return LANMAN;
826 fallthrough;
827 default:
828 return Unspecified;
829 }
830 default:
831 return Unspecified;
832 }
833}
834
835struct sess_data {
836 unsigned int xid;
837 struct cifs_ses *ses;
838 struct nls_table *nls_cp;
839 void (*func)(struct sess_data *);
840 int result;
841
842 /* we will send the SMB in three pieces:
843 * a fixed length beginning part, an optional
844 * SPNEGO blob (which can be zero length), and a
845 * last part which will include the strings
846 * and rest of bcc area. This allows us to avoid
847 * a large buffer 17K allocation
848 */
849 int buf0_type;
850 struct kvec iov[3];
851};
852
853static int
854sess_alloc_buffer(struct sess_data *sess_data, int wct)
855{
856 int rc;
857 struct cifs_ses *ses = sess_data->ses;
858 struct smb_hdr *smb_buf;
859
860 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
861 (void **)&smb_buf);
862
863 if (rc)
864 return rc;
865
866 sess_data->iov[0].iov_base = (char *)smb_buf;
867 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
868 /*
869 * This variable will be used to clear the buffer
870 * allocated above in case of any error in the calling function.
871 */
872 sess_data->buf0_type = CIFS_SMALL_BUFFER;
873
874 /* 2000 big enough to fit max user, domain, NOS name etc. */
875 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
876 if (!sess_data->iov[2].iov_base) {
877 rc = -ENOMEM;
878 goto out_free_smb_buf;
879 }
880
881 return 0;
882
883out_free_smb_buf:
884 kfree(smb_buf);
885 sess_data->iov[0].iov_base = NULL;
886 sess_data->iov[0].iov_len = 0;
887 sess_data->buf0_type = CIFS_NO_BUFFER;
888 return rc;
889}
890
891static void
892sess_free_buffer(struct sess_data *sess_data)
893{
894
895 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
896 sess_data->buf0_type = CIFS_NO_BUFFER;
897 kfree(sess_data->iov[2].iov_base);
898}
899
900static int
901sess_establish_session(struct sess_data *sess_data)
902{
903 struct cifs_ses *ses = sess_data->ses;
904
905 mutex_lock(&ses->server->srv_mutex);
906 if (!ses->server->session_estab) {
907 if (ses->server->sign) {
908 ses->server->session_key.response =
909 kmemdup(ses->auth_key.response,
910 ses->auth_key.len, GFP_KERNEL);
911 if (!ses->server->session_key.response) {
912 mutex_unlock(&ses->server->srv_mutex);
913 return -ENOMEM;
914 }
915 ses->server->session_key.len =
916 ses->auth_key.len;
917 }
918 ses->server->sequence_number = 0x2;
919 ses->server->session_estab = true;
920 }
921 mutex_unlock(&ses->server->srv_mutex);
922
923 cifs_dbg(FYI, "CIFS session established successfully\n");
924 spin_lock(&GlobalMid_Lock);
925 ses->status = CifsGood;
926 ses->need_reconnect = false;
927 spin_unlock(&GlobalMid_Lock);
928
929 return 0;
930}
931
932static int
933sess_sendreceive(struct sess_data *sess_data)
934{
935 int rc;
936 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
937 __u16 count;
938 struct kvec rsp_iov = { NULL, 0 };
939
940 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
941 be32_add_cpu(&smb_buf->smb_buf_length, count);
942 put_bcc(count, smb_buf);
943
944 rc = SendReceive2(sess_data->xid, sess_data->ses,
945 sess_data->iov, 3 /* num_iovecs */,
946 &sess_data->buf0_type,
947 CIFS_LOG_ERROR, &rsp_iov);
948 cifs_small_buf_release(sess_data->iov[0].iov_base);
949 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
950
951 return rc;
952}
953
954/*
955 * LANMAN and plaintext are less secure and off by default.
956 * So we make this explicitly be turned on in kconfig (in the
957 * build) and turned on at runtime (changed from the default)
958 * in proc/fs/cifs or via mount parm. Unfortunately this is
959 * needed for old Win (e.g. Win95), some obscure NAS and OS/2
960 */
961#ifdef CONFIG_CIFS_WEAK_PW_HASH
962static void
963sess_auth_lanman(struct sess_data *sess_data)
964{
965 int rc = 0;
966 struct smb_hdr *smb_buf;
967 SESSION_SETUP_ANDX *pSMB;
968 char *bcc_ptr;
969 struct cifs_ses *ses = sess_data->ses;
970 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
971 __u16 bytes_remaining;
972
973 /* lanman 2 style sessionsetup */
974 /* wct = 10 */
975 rc = sess_alloc_buffer(sess_data, 10);
976 if (rc)
977 goto out;
978
979 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
980 bcc_ptr = sess_data->iov[2].iov_base;
981 (void)cifs_ssetup_hdr(ses, pSMB);
982
983 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
984
985 if (ses->user_name != NULL) {
986 /* no capabilities flags in old lanman negotiation */
987 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
988
989 /* Calculate hash with password and copy into bcc_ptr.
990 * Encryption Key (stored as in cryptkey) gets used if the
991 * security mode bit in Negotiate Protocol response states
992 * to use challenge/response method (i.e. Password bit is 1).
993 */
994 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
995 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
996 true : false, lnm_session_key);
997 if (rc)
998 goto out;
999
1000 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
1001 bcc_ptr += CIFS_AUTH_RESP_SIZE;
1002 } else {
1003 pSMB->old_req.PasswordLength = 0;
1004 }
1005
1006 /*
1007 * can not sign if LANMAN negotiated so no need
1008 * to calculate signing key? but what if server
1009 * changed to do higher than lanman dialect and
1010 * we reconnected would we ever calc signing_key?
1011 */
1012
1013 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
1014 /* Unicode not allowed for LANMAN dialects */
1015 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1016
1017 sess_data->iov[2].iov_len = (long) bcc_ptr -
1018 (long) sess_data->iov[2].iov_base;
1019
1020 rc = sess_sendreceive(sess_data);
1021 if (rc)
1022 goto out;
1023
1024 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1025 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1026
1027 /* lanman response has a word count of 3 */
1028 if (smb_buf->WordCount != 3) {
1029 rc = -EIO;
1030 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1031 goto out;
1032 }
1033
1034 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1035 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1036
1037 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1038 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1039
1040 bytes_remaining = get_bcc(smb_buf);
1041 bcc_ptr = pByteArea(smb_buf);
1042
1043 /* BB check if Unicode and decode strings */
1044 if (bytes_remaining == 0) {
1045 /* no string area to decode, do nothing */
1046 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1047 /* unicode string area must be word-aligned */
1048 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1049 ++bcc_ptr;
1050 --bytes_remaining;
1051 }
1052 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1053 sess_data->nls_cp);
1054 } else {
1055 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1056 sess_data->nls_cp);
1057 }
1058
1059 rc = sess_establish_session(sess_data);
1060out:
1061 sess_data->result = rc;
1062 sess_data->func = NULL;
1063 sess_free_buffer(sess_data);
1064}
1065
1066#endif
1067
1068static void
1069sess_auth_ntlm(struct sess_data *sess_data)
1070{
1071 int rc = 0;
1072 struct smb_hdr *smb_buf;
1073 SESSION_SETUP_ANDX *pSMB;
1074 char *bcc_ptr;
1075 struct cifs_ses *ses = sess_data->ses;
1076 __u32 capabilities;
1077 __u16 bytes_remaining;
1078
1079 /* old style NTLM sessionsetup */
1080 /* wct = 13 */
1081 rc = sess_alloc_buffer(sess_data, 13);
1082 if (rc)
1083 goto out;
1084
1085 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1086 bcc_ptr = sess_data->iov[2].iov_base;
1087 capabilities = cifs_ssetup_hdr(ses, pSMB);
1088
1089 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
1090 if (ses->user_name != NULL) {
1091 pSMB->req_no_secext.CaseInsensitivePasswordLength =
1092 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
1093 pSMB->req_no_secext.CaseSensitivePasswordLength =
1094 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
1095
1096 /* calculate ntlm response and session key */
1097 rc = setup_ntlm_response(ses, sess_data->nls_cp);
1098 if (rc) {
1099 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
1100 rc);
1101 goto out;
1102 }
1103
1104 /* copy ntlm response */
1105 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1106 CIFS_AUTH_RESP_SIZE);
1107 bcc_ptr += CIFS_AUTH_RESP_SIZE;
1108 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1109 CIFS_AUTH_RESP_SIZE);
1110 bcc_ptr += CIFS_AUTH_RESP_SIZE;
1111 } else {
1112 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
1113 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
1114 }
1115
1116 if (ses->capabilities & CAP_UNICODE) {
1117 /* unicode strings must be word aligned */
1118 if (sess_data->iov[0].iov_len % 2) {
1119 *bcc_ptr = 0;
1120 bcc_ptr++;
1121 }
1122 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1123 } else {
1124 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1125 }
1126
1127
1128 sess_data->iov[2].iov_len = (long) bcc_ptr -
1129 (long) sess_data->iov[2].iov_base;
1130
1131 rc = sess_sendreceive(sess_data);
1132 if (rc)
1133 goto out;
1134
1135 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1136 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1137
1138 if (smb_buf->WordCount != 3) {
1139 rc = -EIO;
1140 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1141 goto out;
1142 }
1143
1144 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1145 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1146
1147 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1148 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1149
1150 bytes_remaining = get_bcc(smb_buf);
1151 bcc_ptr = pByteArea(smb_buf);
1152
1153 /* BB check if Unicode and decode strings */
1154 if (bytes_remaining == 0) {
1155 /* no string area to decode, do nothing */
1156 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1157 /* unicode string area must be word-aligned */
1158 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1159 ++bcc_ptr;
1160 --bytes_remaining;
1161 }
1162 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1163 sess_data->nls_cp);
1164 } else {
1165 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1166 sess_data->nls_cp);
1167 }
1168
1169 rc = sess_establish_session(sess_data);
1170out:
1171 sess_data->result = rc;
1172 sess_data->func = NULL;
1173 sess_free_buffer(sess_data);
1174 kfree(ses->auth_key.response);
1175 ses->auth_key.response = NULL;
1176}
1177
1178static void
1179sess_auth_ntlmv2(struct sess_data *sess_data)
1180{
1181 int rc = 0;
1182 struct smb_hdr *smb_buf;
1183 SESSION_SETUP_ANDX *pSMB;
1184 char *bcc_ptr;
1185 struct cifs_ses *ses = sess_data->ses;
1186 __u32 capabilities;
1187 __u16 bytes_remaining;
1188
1189 /* old style NTLM sessionsetup */
1190 /* wct = 13 */
1191 rc = sess_alloc_buffer(sess_data, 13);
1192 if (rc)
1193 goto out;
1194
1195 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1196 bcc_ptr = sess_data->iov[2].iov_base;
1197 capabilities = cifs_ssetup_hdr(ses, pSMB);
1198
1199 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
1200
1201 /* LM2 password would be here if we supported it */
1202 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
1203
1204 if (ses->user_name != NULL) {
1205 /* calculate nlmv2 response and session key */
1206 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
1207 if (rc) {
1208 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
1209 goto out;
1210 }
1211
1212 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1213 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1214 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1215
1216 /* set case sensitive password length after tilen may get
1217 * assigned, tilen is 0 otherwise.
1218 */
1219 pSMB->req_no_secext.CaseSensitivePasswordLength =
1220 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1221 } else {
1222 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
1223 }
1224
1225 if (ses->capabilities & CAP_UNICODE) {
1226 if (sess_data->iov[0].iov_len % 2) {
1227 *bcc_ptr = 0;
1228 bcc_ptr++;
1229 }
1230 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1231 } else {
1232 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1233 }
1234
1235
1236 sess_data->iov[2].iov_len = (long) bcc_ptr -
1237 (long) sess_data->iov[2].iov_base;
1238
1239 rc = sess_sendreceive(sess_data);
1240 if (rc)
1241 goto out;
1242
1243 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1244 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1245
1246 if (smb_buf->WordCount != 3) {
1247 rc = -EIO;
1248 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1249 goto out;
1250 }
1251
1252 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1253 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1254
1255 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1256 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1257
1258 bytes_remaining = get_bcc(smb_buf);
1259 bcc_ptr = pByteArea(smb_buf);
1260
1261 /* BB check if Unicode and decode strings */
1262 if (bytes_remaining == 0) {
1263 /* no string area to decode, do nothing */
1264 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1265 /* unicode string area must be word-aligned */
1266 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1267 ++bcc_ptr;
1268 --bytes_remaining;
1269 }
1270 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1271 sess_data->nls_cp);
1272 } else {
1273 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1274 sess_data->nls_cp);
1275 }
1276
1277 rc = sess_establish_session(sess_data);
1278out:
1279 sess_data->result = rc;
1280 sess_data->func = NULL;
1281 sess_free_buffer(sess_data);
1282 kfree(ses->auth_key.response);
1283 ses->auth_key.response = NULL;
1284}
1285
1286#ifdef CONFIG_CIFS_UPCALL
1287static void
1288sess_auth_kerberos(struct sess_data *sess_data)
1289{
1290 int rc = 0;
1291 struct smb_hdr *smb_buf;
1292 SESSION_SETUP_ANDX *pSMB;
1293 char *bcc_ptr;
1294 struct cifs_ses *ses = sess_data->ses;
1295 __u32 capabilities;
1296 __u16 bytes_remaining;
1297 struct key *spnego_key = NULL;
1298 struct cifs_spnego_msg *msg;
1299 u16 blob_len;
1300
1301 /* extended security */
1302 /* wct = 12 */
1303 rc = sess_alloc_buffer(sess_data, 12);
1304 if (rc)
1305 goto out;
1306
1307 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1308 bcc_ptr = sess_data->iov[2].iov_base;
1309 capabilities = cifs_ssetup_hdr(ses, pSMB);
1310
1311 spnego_key = cifs_get_spnego_key(ses);
1312 if (IS_ERR(spnego_key)) {
1313 rc = PTR_ERR(spnego_key);
1314 spnego_key = NULL;
1315 goto out;
1316 }
1317
1318 msg = spnego_key->payload.data[0];
1319 /*
1320 * check version field to make sure that cifs.upcall is
1321 * sending us a response in an expected form
1322 */
1323 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1324 cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n",
1325 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1326 rc = -EKEYREJECTED;
1327 goto out_put_spnego_key;
1328 }
1329
1330 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1331 GFP_KERNEL);
1332 if (!ses->auth_key.response) {
1333 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1334 msg->sesskey_len);
1335 rc = -ENOMEM;
1336 goto out_put_spnego_key;
1337 }
1338 ses->auth_key.len = msg->sesskey_len;
1339
1340 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1341 capabilities |= CAP_EXTENDED_SECURITY;
1342 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1343 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1344 sess_data->iov[1].iov_len = msg->secblob_len;
1345 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1346
1347 if (ses->capabilities & CAP_UNICODE) {
1348 /* unicode strings must be word aligned */
1349 if ((sess_data->iov[0].iov_len
1350 + sess_data->iov[1].iov_len) % 2) {
1351 *bcc_ptr = 0;
1352 bcc_ptr++;
1353 }
1354 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1355 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1356 } else {
1357 /* BB: is this right? */
1358 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1359 }
1360
1361 sess_data->iov[2].iov_len = (long) bcc_ptr -
1362 (long) sess_data->iov[2].iov_base;
1363
1364 rc = sess_sendreceive(sess_data);
1365 if (rc)
1366 goto out_put_spnego_key;
1367
1368 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1369 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1370
1371 if (smb_buf->WordCount != 4) {
1372 rc = -EIO;
1373 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1374 goto out_put_spnego_key;
1375 }
1376
1377 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1378 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1379
1380 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1381 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1382
1383 bytes_remaining = get_bcc(smb_buf);
1384 bcc_ptr = pByteArea(smb_buf);
1385
1386 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1387 if (blob_len > bytes_remaining) {
1388 cifs_dbg(VFS, "bad security blob length %d\n",
1389 blob_len);
1390 rc = -EINVAL;
1391 goto out_put_spnego_key;
1392 }
1393 bcc_ptr += blob_len;
1394 bytes_remaining -= blob_len;
1395
1396 /* BB check if Unicode and decode strings */
1397 if (bytes_remaining == 0) {
1398 /* no string area to decode, do nothing */
1399 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1400 /* unicode string area must be word-aligned */
1401 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1402 ++bcc_ptr;
1403 --bytes_remaining;
1404 }
1405 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1406 sess_data->nls_cp);
1407 } else {
1408 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1409 sess_data->nls_cp);
1410 }
1411
1412 rc = sess_establish_session(sess_data);
1413out_put_spnego_key:
1414 key_invalidate(spnego_key);
1415 key_put(spnego_key);
1416out:
1417 sess_data->result = rc;
1418 sess_data->func = NULL;
1419 sess_free_buffer(sess_data);
1420 kfree(ses->auth_key.response);
1421 ses->auth_key.response = NULL;
1422}
1423
1424#endif /* ! CONFIG_CIFS_UPCALL */
1425
1426/*
1427 * The required kvec buffers have to be allocated before calling this
1428 * function.
1429 */
1430static int
1431_sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1432{
1433 SESSION_SETUP_ANDX *pSMB;
1434 struct cifs_ses *ses = sess_data->ses;
1435 __u32 capabilities;
1436 char *bcc_ptr;
1437
1438 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1439
1440 capabilities = cifs_ssetup_hdr(ses, pSMB);
1441 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1442 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1443 return -ENOSYS;
1444 }
1445
1446 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1447 capabilities |= CAP_EXTENDED_SECURITY;
1448 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1449
1450 bcc_ptr = sess_data->iov[2].iov_base;
1451 /* unicode strings must be word aligned */
1452 if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1453 *bcc_ptr = 0;
1454 bcc_ptr++;
1455 }
1456 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1457
1458 sess_data->iov[2].iov_len = (long) bcc_ptr -
1459 (long) sess_data->iov[2].iov_base;
1460
1461 return 0;
1462}
1463
1464static void
1465sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1466
1467static void
1468sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1469{
1470 int rc;
1471 struct smb_hdr *smb_buf;
1472 SESSION_SETUP_ANDX *pSMB;
1473 struct cifs_ses *ses = sess_data->ses;
1474 __u16 bytes_remaining;
1475 char *bcc_ptr;
1476 u16 blob_len;
1477
1478 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1479
1480 /*
1481 * if memory allocation is successful, caller of this function
1482 * frees it.
1483 */
1484 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1485 if (!ses->ntlmssp) {
1486 rc = -ENOMEM;
1487 goto out;
1488 }
1489 ses->ntlmssp->sesskey_per_smbsess = false;
1490
1491 /* wct = 12 */
1492 rc = sess_alloc_buffer(sess_data, 12);
1493 if (rc)
1494 goto out;
1495
1496 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1497
1498 /* Build security blob before we assemble the request */
1499 build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
1500 sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
1501 sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
1502 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
1503
1504 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1505 if (rc)
1506 goto out;
1507
1508 rc = sess_sendreceive(sess_data);
1509
1510 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1511 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1512
1513 /* If true, rc here is expected and not an error */
1514 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1515 smb_buf->Status.CifsError ==
1516 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1517 rc = 0;
1518
1519 if (rc)
1520 goto out;
1521
1522 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1523
1524 if (smb_buf->WordCount != 4) {
1525 rc = -EIO;
1526 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1527 goto out;
1528 }
1529
1530 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1531 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1532
1533 bytes_remaining = get_bcc(smb_buf);
1534 bcc_ptr = pByteArea(smb_buf);
1535
1536 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1537 if (blob_len > bytes_remaining) {
1538 cifs_dbg(VFS, "bad security blob length %d\n",
1539 blob_len);
1540 rc = -EINVAL;
1541 goto out;
1542 }
1543
1544 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1545out:
1546 sess_free_buffer(sess_data);
1547
1548 if (!rc) {
1549 sess_data->func = sess_auth_rawntlmssp_authenticate;
1550 return;
1551 }
1552
1553 /* Else error. Cleanup */
1554 kfree(ses->auth_key.response);
1555 ses->auth_key.response = NULL;
1556 kfree(ses->ntlmssp);
1557 ses->ntlmssp = NULL;
1558
1559 sess_data->func = NULL;
1560 sess_data->result = rc;
1561}
1562
1563static void
1564sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1565{
1566 int rc;
1567 struct smb_hdr *smb_buf;
1568 SESSION_SETUP_ANDX *pSMB;
1569 struct cifs_ses *ses = sess_data->ses;
1570 __u16 bytes_remaining;
1571 char *bcc_ptr;
1572 unsigned char *ntlmsspblob = NULL;
1573 u16 blob_len;
1574
1575 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1576
1577 /* wct = 12 */
1578 rc = sess_alloc_buffer(sess_data, 12);
1579 if (rc)
1580 goto out;
1581
1582 /* Build security blob before we assemble the request */
1583 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1584 smb_buf = (struct smb_hdr *)pSMB;
1585 rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1586 &blob_len, ses, sess_data->nls_cp);
1587 if (rc)
1588 goto out_free_ntlmsspblob;
1589 sess_data->iov[1].iov_len = blob_len;
1590 sess_data->iov[1].iov_base = ntlmsspblob;
1591 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1592 /*
1593 * Make sure that we tell the server that we are using
1594 * the uid that it just gave us back on the response
1595 * (challenge)
1596 */
1597 smb_buf->Uid = ses->Suid;
1598
1599 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1600 if (rc)
1601 goto out_free_ntlmsspblob;
1602
1603 rc = sess_sendreceive(sess_data);
1604 if (rc)
1605 goto out_free_ntlmsspblob;
1606
1607 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1608 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1609 if (smb_buf->WordCount != 4) {
1610 rc = -EIO;
1611 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1612 goto out_free_ntlmsspblob;
1613 }
1614
1615 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1616 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1617
1618 if (ses->Suid != smb_buf->Uid) {
1619 ses->Suid = smb_buf->Uid;
1620 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1621 }
1622
1623 bytes_remaining = get_bcc(smb_buf);
1624 bcc_ptr = pByteArea(smb_buf);
1625 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1626 if (blob_len > bytes_remaining) {
1627 cifs_dbg(VFS, "bad security blob length %d\n",
1628 blob_len);
1629 rc = -EINVAL;
1630 goto out_free_ntlmsspblob;
1631 }
1632 bcc_ptr += blob_len;
1633 bytes_remaining -= blob_len;
1634
1635
1636 /* BB check if Unicode and decode strings */
1637 if (bytes_remaining == 0) {
1638 /* no string area to decode, do nothing */
1639 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1640 /* unicode string area must be word-aligned */
1641 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1642 ++bcc_ptr;
1643 --bytes_remaining;
1644 }
1645 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1646 sess_data->nls_cp);
1647 } else {
1648 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1649 sess_data->nls_cp);
1650 }
1651
1652out_free_ntlmsspblob:
1653 kfree(ntlmsspblob);
1654out:
1655 sess_free_buffer(sess_data);
1656
1657 if (!rc)
1658 rc = sess_establish_session(sess_data);
1659
1660 /* Cleanup */
1661 kfree(ses->auth_key.response);
1662 ses->auth_key.response = NULL;
1663 kfree(ses->ntlmssp);
1664 ses->ntlmssp = NULL;
1665
1666 sess_data->func = NULL;
1667 sess_data->result = rc;
1668}
1669
1670static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
1671{
1672 int type;
1673
1674 type = cifs_select_sectype(ses->server, ses->sectype);
1675 cifs_dbg(FYI, "sess setup type %d\n", type);
1676 if (type == Unspecified) {
1677 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1678 return -EINVAL;
1679 }
1680
1681 switch (type) {
1682 case LANMAN:
1683 /* LANMAN and plaintext are less secure and off by default.
1684 * So we make this explicitly be turned on in kconfig (in the
1685 * build) and turned on at runtime (changed from the default)
1686 * in proc/fs/cifs or via mount parm. Unfortunately this is
1687 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
1688#ifdef CONFIG_CIFS_WEAK_PW_HASH
1689 sess_data->func = sess_auth_lanman;
1690 break;
1691#else
1692 return -EOPNOTSUPP;
1693#endif
1694 case NTLM:
1695 sess_data->func = sess_auth_ntlm;
1696 break;
1697 case NTLMv2:
1698 sess_data->func = sess_auth_ntlmv2;
1699 break;
1700 case Kerberos:
1701#ifdef CONFIG_CIFS_UPCALL
1702 sess_data->func = sess_auth_kerberos;
1703 break;
1704#else
1705 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1706 return -ENOSYS;
1707#endif /* CONFIG_CIFS_UPCALL */
1708 case RawNTLMSSP:
1709 sess_data->func = sess_auth_rawntlmssp_negotiate;
1710 break;
1711 default:
1712 cifs_dbg(VFS, "secType %d not supported!\n", type);
1713 return -ENOSYS;
1714 }
1715
1716 return 0;
1717}
1718
1719int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1720 const struct nls_table *nls_cp)
1721{
1722 int rc = 0;
1723 struct sess_data *sess_data;
1724
1725 if (ses == NULL) {
1726 WARN(1, "%s: ses == NULL!", __func__);
1727 return -EINVAL;
1728 }
1729
1730 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1731 if (!sess_data)
1732 return -ENOMEM;
1733
1734 rc = select_sec(ses, sess_data);
1735 if (rc)
1736 goto out;
1737
1738 sess_data->xid = xid;
1739 sess_data->ses = ses;
1740 sess_data->buf0_type = CIFS_NO_BUFFER;
1741 sess_data->nls_cp = (struct nls_table *) nls_cp;
1742
1743 while (sess_data->func)
1744 sess_data->func(sess_data);
1745
1746 /* Store result before we free sess_data */
1747 rc = sess_data->result;
1748
1749out:
1750 kfree(sess_data);
1751 return rc;
1752}