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
cifs_ssetup_hdr(struct cifs_ses * ses,SESSION_SETUP_ANDX * pSMB)35 static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB)
36 {
37 __u32 capabilities = 0;
38
39 /* init fields common to all four types of SessSetup */
40 /* Note that offsets for first seven fields in req struct are same */
41 /* in CIFS Specs so does not matter which of 3 forms of struct */
42 /* that we use in next few lines */
43 /* Note that header is initialized to zero in header_assemble */
44 pSMB->req.AndXCommand = 0xFF;
45 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
46 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
47 USHRT_MAX));
48 pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
49 pSMB->req.VcNumber = cpu_to_le16(1);
50
51 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
52
53 /* BB verify whether signing required on neg or just on auth frame
54 (and NTLM case) */
55
56 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
57 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
58
59 if (ses->server->sign)
60 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
61
62 if (ses->capabilities & CAP_UNICODE) {
63 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
64 capabilities |= CAP_UNICODE;
65 }
66 if (ses->capabilities & CAP_STATUS32) {
67 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
68 capabilities |= CAP_STATUS32;
69 }
70 if (ses->capabilities & CAP_DFS) {
71 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
72 capabilities |= CAP_DFS;
73 }
74 if (ses->capabilities & CAP_UNIX)
75 capabilities |= CAP_UNIX;
76
77 return capabilities;
78 }
79
80 static void
unicode_oslm_strings(char ** pbcc_area,const struct nls_table * nls_cp)81 unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
82 {
83 char *bcc_ptr = *pbcc_area;
84 int bytes_ret = 0;
85
86 /* Copy OS version */
87 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
88 nls_cp);
89 bcc_ptr += 2 * bytes_ret;
90 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
91 32, nls_cp);
92 bcc_ptr += 2 * bytes_ret;
93 bcc_ptr += 2; /* trailing null */
94
95 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
96 32, nls_cp);
97 bcc_ptr += 2 * bytes_ret;
98 bcc_ptr += 2; /* trailing null */
99
100 *pbcc_area = bcc_ptr;
101 }
102
unicode_domain_string(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)103 static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
104 const struct nls_table *nls_cp)
105 {
106 char *bcc_ptr = *pbcc_area;
107 int bytes_ret = 0;
108
109 /* copy domain */
110 if (ses->domainName == NULL) {
111 /* Sending null domain better than using a bogus domain name (as
112 we did briefly in 2.6.18) since server will use its default */
113 *bcc_ptr = 0;
114 *(bcc_ptr+1) = 0;
115 bytes_ret = 0;
116 } else
117 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
118 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
119 bcc_ptr += 2 * bytes_ret;
120 bcc_ptr += 2; /* account for null terminator */
121
122 *pbcc_area = bcc_ptr;
123 }
124
125
unicode_ssetup_strings(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)126 static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
127 const struct nls_table *nls_cp)
128 {
129 char *bcc_ptr = *pbcc_area;
130 int bytes_ret = 0;
131
132 /* BB FIXME add check that strings total less
133 than 335 or will need to send them as arrays */
134
135 /* unicode strings, must be word aligned before the call */
136 /* if ((long) bcc_ptr % 2) {
137 *bcc_ptr = 0;
138 bcc_ptr++;
139 } */
140 /* copy user */
141 if (ses->user_name == NULL) {
142 /* null user mount */
143 *bcc_ptr = 0;
144 *(bcc_ptr+1) = 0;
145 } else {
146 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
147 CIFS_MAX_USERNAME_LEN, nls_cp);
148 }
149 bcc_ptr += 2 * bytes_ret;
150 bcc_ptr += 2; /* account for null termination */
151
152 unicode_domain_string(&bcc_ptr, ses, nls_cp);
153 unicode_oslm_strings(&bcc_ptr, nls_cp);
154
155 *pbcc_area = bcc_ptr;
156 }
157
ascii_ssetup_strings(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)158 static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
159 const struct nls_table *nls_cp)
160 {
161 char *bcc_ptr = *pbcc_area;
162
163 /* copy user */
164 /* BB what about null user mounts - check that we do this BB */
165 /* copy user */
166 if (ses->user_name != NULL) {
167 strncpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
168 bcc_ptr += strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
169 }
170 /* else null user mount */
171 *bcc_ptr = 0;
172 bcc_ptr++; /* account for null termination */
173
174 /* copy domain */
175 if (ses->domainName != NULL) {
176 strncpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
177 bcc_ptr += strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
178 } /* else we will send a null domain name
179 so the server will default to its own domain */
180 *bcc_ptr = 0;
181 bcc_ptr++;
182
183 /* BB check for overflow here */
184
185 strcpy(bcc_ptr, "Linux version ");
186 bcc_ptr += strlen("Linux version ");
187 strcpy(bcc_ptr, init_utsname()->release);
188 bcc_ptr += strlen(init_utsname()->release) + 1;
189
190 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
191 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
192
193 *pbcc_area = bcc_ptr;
194 }
195
196 static void
decode_unicode_ssetup(char ** pbcc_area,int bleft,struct cifs_ses * ses,const struct nls_table * nls_cp)197 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
198 const struct nls_table *nls_cp)
199 {
200 int len;
201 char *data = *pbcc_area;
202
203 cifs_dbg(FYI, "bleft %d\n", bleft);
204
205 kfree(ses->serverOS);
206 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
207 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
208 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
209 data += len;
210 bleft -= len;
211 if (bleft <= 0)
212 return;
213
214 kfree(ses->serverNOS);
215 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
216 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
217 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
218 data += len;
219 bleft -= len;
220 if (bleft <= 0)
221 return;
222
223 kfree(ses->serverDomain);
224 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
225 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
226
227 return;
228 }
229
decode_ascii_ssetup(char ** pbcc_area,__u16 bleft,struct cifs_ses * ses,const struct nls_table * nls_cp)230 static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
231 struct cifs_ses *ses,
232 const struct nls_table *nls_cp)
233 {
234 int len;
235 char *bcc_ptr = *pbcc_area;
236
237 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
238
239 len = strnlen(bcc_ptr, bleft);
240 if (len >= bleft)
241 return;
242
243 kfree(ses->serverOS);
244
245 ses->serverOS = kzalloc(len + 1, GFP_KERNEL);
246 if (ses->serverOS) {
247 strncpy(ses->serverOS, bcc_ptr, len);
248 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
249 cifs_dbg(FYI, "OS/2 server\n");
250 }
251
252 bcc_ptr += len + 1;
253 bleft -= len + 1;
254
255 len = strnlen(bcc_ptr, bleft);
256 if (len >= bleft)
257 return;
258
259 kfree(ses->serverNOS);
260
261 ses->serverNOS = kzalloc(len + 1, GFP_KERNEL);
262 if (ses->serverNOS)
263 strncpy(ses->serverNOS, bcc_ptr, len);
264
265 bcc_ptr += len + 1;
266 bleft -= len + 1;
267
268 len = strnlen(bcc_ptr, bleft);
269 if (len > bleft)
270 return;
271
272 /* No domain field in LANMAN case. Domain is
273 returned by old servers in the SMB negprot response */
274 /* BB For newer servers which do not support Unicode,
275 but thus do return domain here we could add parsing
276 for it later, but it is not very important */
277 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
278 }
279
decode_ntlmssp_challenge(char * bcc_ptr,int blob_len,struct cifs_ses * ses)280 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
281 struct cifs_ses *ses)
282 {
283 unsigned int tioffset; /* challenge message target info area */
284 unsigned int tilen; /* challenge message target info area length */
285
286 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
287
288 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
289 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
290 return -EINVAL;
291 }
292
293 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
294 cifs_dbg(VFS, "blob signature incorrect %s\n",
295 pblob->Signature);
296 return -EINVAL;
297 }
298 if (pblob->MessageType != NtLmChallenge) {
299 cifs_dbg(VFS, "Incorrect message type %d\n",
300 pblob->MessageType);
301 return -EINVAL;
302 }
303
304 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
305 /* BB we could decode pblob->NegotiateFlags; some may be useful */
306 /* In particular we can examine sign flags */
307 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
308 we must set the MIC field of the AUTHENTICATE_MESSAGE */
309 ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags);
310 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
311 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
312 if (tioffset > blob_len || tioffset + tilen > blob_len) {
313 cifs_dbg(VFS, "tioffset + tilen too high %u + %u",
314 tioffset, tilen);
315 return -EINVAL;
316 }
317 if (tilen) {
318 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
319 GFP_KERNEL);
320 if (!ses->auth_key.response) {
321 cifs_dbg(VFS, "Challenge target info alloc failure");
322 return -ENOMEM;
323 }
324 ses->auth_key.len = tilen;
325 }
326
327 return 0;
328 }
329
330 /* BB Move to ntlmssp.c eventually */
331
332 /* We do not malloc the blob, it is passed in pbuffer, because
333 it is fixed size, and small, making this approach cleaner */
build_ntlmssp_negotiate_blob(unsigned char * pbuffer,struct cifs_ses * ses)334 void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
335 struct cifs_ses *ses)
336 {
337 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer;
338 __u32 flags;
339
340 memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
341 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
342 sec_blob->MessageType = NtLmNegotiate;
343
344 /* BB is NTLMV2 session security format easier to use here? */
345 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
346 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
347 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
348 NTLMSSP_NEGOTIATE_SEAL;
349 if (ses->server->sign)
350 flags |= NTLMSSP_NEGOTIATE_SIGN;
351 if (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
352 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
353
354 sec_blob->NegotiateFlags = cpu_to_le32(flags);
355
356 sec_blob->WorkstationName.BufferOffset = 0;
357 sec_blob->WorkstationName.Length = 0;
358 sec_blob->WorkstationName.MaximumLength = 0;
359
360 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
361 sec_blob->DomainName.BufferOffset = 0;
362 sec_blob->DomainName.Length = 0;
363 sec_blob->DomainName.MaximumLength = 0;
364 }
365
size_of_ntlmssp_blob(struct cifs_ses * ses)366 static int size_of_ntlmssp_blob(struct cifs_ses *ses)
367 {
368 int sz = sizeof(AUTHENTICATE_MESSAGE) + ses->auth_key.len
369 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
370
371 if (ses->domainName)
372 sz += 2 * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
373 else
374 sz += 2;
375
376 if (ses->user_name)
377 sz += 2 * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
378 else
379 sz += 2;
380
381 return sz;
382 }
383
build_ntlmssp_auth_blob(unsigned char ** pbuffer,u16 * buflen,struct cifs_ses * ses,const struct nls_table * nls_cp)384 int build_ntlmssp_auth_blob(unsigned char **pbuffer,
385 u16 *buflen,
386 struct cifs_ses *ses,
387 const struct nls_table *nls_cp)
388 {
389 int rc;
390 AUTHENTICATE_MESSAGE *sec_blob;
391 __u32 flags;
392 unsigned char *tmp;
393
394 rc = setup_ntlmv2_rsp(ses, nls_cp);
395 if (rc) {
396 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
397 *buflen = 0;
398 goto setup_ntlmv2_ret;
399 }
400 *pbuffer = kmalloc(size_of_ntlmssp_blob(ses), GFP_KERNEL);
401 if (!*pbuffer) {
402 rc = -ENOMEM;
403 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
404 *buflen = 0;
405 goto setup_ntlmv2_ret;
406 }
407 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
408
409 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
410 sec_blob->MessageType = NtLmAuthenticate;
411
412 flags = NTLMSSP_NEGOTIATE_56 |
413 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
414 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
415 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
416 NTLMSSP_NEGOTIATE_SEAL;
417 if (ses->server->sign)
418 flags |= NTLMSSP_NEGOTIATE_SIGN;
419 if (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
420 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
421
422 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
423 sec_blob->NegotiateFlags = cpu_to_le32(flags);
424
425 sec_blob->LmChallengeResponse.BufferOffset =
426 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
427 sec_blob->LmChallengeResponse.Length = 0;
428 sec_blob->LmChallengeResponse.MaximumLength = 0;
429
430 sec_blob->NtChallengeResponse.BufferOffset =
431 cpu_to_le32(tmp - *pbuffer);
432 if (ses->user_name != NULL) {
433 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
434 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
435 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
436
437 sec_blob->NtChallengeResponse.Length =
438 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
439 sec_blob->NtChallengeResponse.MaximumLength =
440 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
441 } else {
442 /*
443 * don't send an NT Response for anonymous access
444 */
445 sec_blob->NtChallengeResponse.Length = 0;
446 sec_blob->NtChallengeResponse.MaximumLength = 0;
447 }
448
449 if (ses->domainName == NULL) {
450 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
451 sec_blob->DomainName.Length = 0;
452 sec_blob->DomainName.MaximumLength = 0;
453 tmp += 2;
454 } else {
455 int len;
456 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
457 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
458 len *= 2; /* unicode is 2 bytes each */
459 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
460 sec_blob->DomainName.Length = cpu_to_le16(len);
461 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
462 tmp += len;
463 }
464
465 if (ses->user_name == NULL) {
466 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
467 sec_blob->UserName.Length = 0;
468 sec_blob->UserName.MaximumLength = 0;
469 tmp += 2;
470 } else {
471 int len;
472 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
473 CIFS_MAX_USERNAME_LEN, nls_cp);
474 len *= 2; /* unicode is 2 bytes each */
475 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
476 sec_blob->UserName.Length = cpu_to_le16(len);
477 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
478 tmp += len;
479 }
480
481 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
482 sec_blob->WorkstationName.Length = 0;
483 sec_blob->WorkstationName.MaximumLength = 0;
484 tmp += 2;
485
486 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
487 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
488 && !calc_seckey(ses)) {
489 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
490 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
491 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
492 sec_blob->SessionKey.MaximumLength =
493 cpu_to_le16(CIFS_CPHTXT_SIZE);
494 tmp += CIFS_CPHTXT_SIZE;
495 } else {
496 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
497 sec_blob->SessionKey.Length = 0;
498 sec_blob->SessionKey.MaximumLength = 0;
499 }
500
501 *buflen = tmp - *pbuffer;
502 setup_ntlmv2_ret:
503 return rc;
504 }
505
506 enum securityEnum
cifs_select_sectype(struct TCP_Server_Info * server,enum securityEnum requested)507 cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
508 {
509 switch (server->negflavor) {
510 case CIFS_NEGFLAVOR_EXTENDED:
511 switch (requested) {
512 case Kerberos:
513 case RawNTLMSSP:
514 return requested;
515 case Unspecified:
516 if (server->sec_ntlmssp &&
517 (global_secflags & CIFSSEC_MAY_NTLMSSP))
518 return RawNTLMSSP;
519 if ((server->sec_kerberos || server->sec_mskerberos) &&
520 (global_secflags & CIFSSEC_MAY_KRB5))
521 return Kerberos;
522 /* Fallthrough */
523 default:
524 return Unspecified;
525 }
526 case CIFS_NEGFLAVOR_UNENCAP:
527 switch (requested) {
528 case NTLM:
529 case NTLMv2:
530 return requested;
531 case Unspecified:
532 if (global_secflags & CIFSSEC_MAY_NTLMV2)
533 return NTLMv2;
534 if (global_secflags & CIFSSEC_MAY_NTLM)
535 return NTLM;
536 default:
537 /* Fallthrough to attempt LANMAN authentication next */
538 break;
539 }
540 case CIFS_NEGFLAVOR_LANMAN:
541 switch (requested) {
542 case LANMAN:
543 return requested;
544 case Unspecified:
545 if (global_secflags & CIFSSEC_MAY_LANMAN)
546 return LANMAN;
547 /* Fallthrough */
548 default:
549 return Unspecified;
550 }
551 default:
552 return Unspecified;
553 }
554 }
555
556 struct sess_data {
557 unsigned int xid;
558 struct cifs_ses *ses;
559 struct nls_table *nls_cp;
560 void (*func)(struct sess_data *);
561 int result;
562
563 /* we will send the SMB in three pieces:
564 * a fixed length beginning part, an optional
565 * SPNEGO blob (which can be zero length), and a
566 * last part which will include the strings
567 * and rest of bcc area. This allows us to avoid
568 * a large buffer 17K allocation
569 */
570 int buf0_type;
571 struct kvec iov[3];
572 };
573
574 static int
sess_alloc_buffer(struct sess_data * sess_data,int wct)575 sess_alloc_buffer(struct sess_data *sess_data, int wct)
576 {
577 int rc;
578 struct cifs_ses *ses = sess_data->ses;
579 struct smb_hdr *smb_buf;
580
581 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
582 (void **)&smb_buf);
583
584 if (rc)
585 return rc;
586
587 sess_data->iov[0].iov_base = (char *)smb_buf;
588 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
589 /*
590 * This variable will be used to clear the buffer
591 * allocated above in case of any error in the calling function.
592 */
593 sess_data->buf0_type = CIFS_SMALL_BUFFER;
594
595 /* 2000 big enough to fit max user, domain, NOS name etc. */
596 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
597 if (!sess_data->iov[2].iov_base) {
598 rc = -ENOMEM;
599 goto out_free_smb_buf;
600 }
601
602 return 0;
603
604 out_free_smb_buf:
605 kfree(smb_buf);
606 sess_data->iov[0].iov_base = NULL;
607 sess_data->iov[0].iov_len = 0;
608 sess_data->buf0_type = CIFS_NO_BUFFER;
609 return rc;
610 }
611
612 static void
sess_free_buffer(struct sess_data * sess_data)613 sess_free_buffer(struct sess_data *sess_data)
614 {
615
616 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
617 sess_data->buf0_type = CIFS_NO_BUFFER;
618 kfree(sess_data->iov[2].iov_base);
619 }
620
621 static int
sess_establish_session(struct sess_data * sess_data)622 sess_establish_session(struct sess_data *sess_data)
623 {
624 struct cifs_ses *ses = sess_data->ses;
625
626 mutex_lock(&ses->server->srv_mutex);
627 if (!ses->server->session_estab) {
628 if (ses->server->sign) {
629 ses->server->session_key.response =
630 kmemdup(ses->auth_key.response,
631 ses->auth_key.len, GFP_KERNEL);
632 if (!ses->server->session_key.response) {
633 mutex_unlock(&ses->server->srv_mutex);
634 return -ENOMEM;
635 }
636 ses->server->session_key.len =
637 ses->auth_key.len;
638 }
639 ses->server->sequence_number = 0x2;
640 ses->server->session_estab = true;
641 }
642 mutex_unlock(&ses->server->srv_mutex);
643
644 cifs_dbg(FYI, "CIFS session established successfully\n");
645 spin_lock(&GlobalMid_Lock);
646 ses->status = CifsGood;
647 ses->need_reconnect = false;
648 spin_unlock(&GlobalMid_Lock);
649
650 return 0;
651 }
652
653 static int
sess_sendreceive(struct sess_data * sess_data)654 sess_sendreceive(struct sess_data *sess_data)
655 {
656 int rc;
657 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
658 __u16 count;
659 struct kvec rsp_iov = { NULL, 0 };
660
661 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
662 smb_buf->smb_buf_length =
663 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
664 put_bcc(count, smb_buf);
665
666 rc = SendReceive2(sess_data->xid, sess_data->ses,
667 sess_data->iov, 3 /* num_iovecs */,
668 &sess_data->buf0_type,
669 CIFS_LOG_ERROR, &rsp_iov);
670 cifs_small_buf_release(sess_data->iov[0].iov_base);
671 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
672
673 return rc;
674 }
675
676 /*
677 * LANMAN and plaintext are less secure and off by default.
678 * So we make this explicitly be turned on in kconfig (in the
679 * build) and turned on at runtime (changed from the default)
680 * in proc/fs/cifs or via mount parm. Unfortunately this is
681 * needed for old Win (e.g. Win95), some obscure NAS and OS/2
682 */
683 #ifdef CONFIG_CIFS_WEAK_PW_HASH
684 static void
sess_auth_lanman(struct sess_data * sess_data)685 sess_auth_lanman(struct sess_data *sess_data)
686 {
687 int rc = 0;
688 struct smb_hdr *smb_buf;
689 SESSION_SETUP_ANDX *pSMB;
690 char *bcc_ptr;
691 struct cifs_ses *ses = sess_data->ses;
692 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
693 __u32 capabilities;
694 __u16 bytes_remaining;
695
696 /* lanman 2 style sessionsetup */
697 /* wct = 10 */
698 rc = sess_alloc_buffer(sess_data, 10);
699 if (rc)
700 goto out;
701
702 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
703 bcc_ptr = sess_data->iov[2].iov_base;
704 capabilities = cifs_ssetup_hdr(ses, pSMB);
705
706 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
707
708 if (ses->user_name != NULL) {
709 /* no capabilities flags in old lanman negotiation */
710 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
711
712 /* Calculate hash with password and copy into bcc_ptr.
713 * Encryption Key (stored as in cryptkey) gets used if the
714 * security mode bit in Negottiate Protocol response states
715 * to use challenge/response method (i.e. Password bit is 1).
716 */
717 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
718 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
719 true : false, lnm_session_key);
720 if (rc)
721 goto out;
722
723 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
724 bcc_ptr += CIFS_AUTH_RESP_SIZE;
725 } else {
726 pSMB->old_req.PasswordLength = 0;
727 }
728
729 /*
730 * can not sign if LANMAN negotiated so no need
731 * to calculate signing key? but what if server
732 * changed to do higher than lanman dialect and
733 * we reconnected would we ever calc signing_key?
734 */
735
736 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
737 /* Unicode not allowed for LANMAN dialects */
738 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
739
740 sess_data->iov[2].iov_len = (long) bcc_ptr -
741 (long) sess_data->iov[2].iov_base;
742
743 rc = sess_sendreceive(sess_data);
744 if (rc)
745 goto out;
746
747 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
748 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
749
750 /* lanman response has a word count of 3 */
751 if (smb_buf->WordCount != 3) {
752 rc = -EIO;
753 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
754 goto out;
755 }
756
757 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
758 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
759
760 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
761 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
762
763 bytes_remaining = get_bcc(smb_buf);
764 bcc_ptr = pByteArea(smb_buf);
765
766 /* BB check if Unicode and decode strings */
767 if (bytes_remaining == 0) {
768 /* no string area to decode, do nothing */
769 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
770 /* unicode string area must be word-aligned */
771 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
772 ++bcc_ptr;
773 --bytes_remaining;
774 }
775 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
776 sess_data->nls_cp);
777 } else {
778 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
779 sess_data->nls_cp);
780 }
781
782 rc = sess_establish_session(sess_data);
783 out:
784 sess_data->result = rc;
785 sess_data->func = NULL;
786 sess_free_buffer(sess_data);
787 }
788
789 #endif
790
791 static void
sess_auth_ntlm(struct sess_data * sess_data)792 sess_auth_ntlm(struct sess_data *sess_data)
793 {
794 int rc = 0;
795 struct smb_hdr *smb_buf;
796 SESSION_SETUP_ANDX *pSMB;
797 char *bcc_ptr;
798 struct cifs_ses *ses = sess_data->ses;
799 __u32 capabilities;
800 __u16 bytes_remaining;
801
802 /* old style NTLM sessionsetup */
803 /* wct = 13 */
804 rc = sess_alloc_buffer(sess_data, 13);
805 if (rc)
806 goto out;
807
808 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
809 bcc_ptr = sess_data->iov[2].iov_base;
810 capabilities = cifs_ssetup_hdr(ses, pSMB);
811
812 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
813 if (ses->user_name != NULL) {
814 pSMB->req_no_secext.CaseInsensitivePasswordLength =
815 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
816 pSMB->req_no_secext.CaseSensitivePasswordLength =
817 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
818
819 /* calculate ntlm response and session key */
820 rc = setup_ntlm_response(ses, sess_data->nls_cp);
821 if (rc) {
822 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
823 rc);
824 goto out;
825 }
826
827 /* copy ntlm response */
828 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
829 CIFS_AUTH_RESP_SIZE);
830 bcc_ptr += CIFS_AUTH_RESP_SIZE;
831 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
832 CIFS_AUTH_RESP_SIZE);
833 bcc_ptr += CIFS_AUTH_RESP_SIZE;
834 } else {
835 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
836 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
837 }
838
839 if (ses->capabilities & CAP_UNICODE) {
840 /* unicode strings must be word aligned */
841 if (sess_data->iov[0].iov_len % 2) {
842 *bcc_ptr = 0;
843 bcc_ptr++;
844 }
845 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
846 } else {
847 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
848 }
849
850
851 sess_data->iov[2].iov_len = (long) bcc_ptr -
852 (long) sess_data->iov[2].iov_base;
853
854 rc = sess_sendreceive(sess_data);
855 if (rc)
856 goto out;
857
858 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
859 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
860
861 if (smb_buf->WordCount != 3) {
862 rc = -EIO;
863 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
864 goto out;
865 }
866
867 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
868 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
869
870 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
871 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
872
873 bytes_remaining = get_bcc(smb_buf);
874 bcc_ptr = pByteArea(smb_buf);
875
876 /* BB check if Unicode and decode strings */
877 if (bytes_remaining == 0) {
878 /* no string area to decode, do nothing */
879 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
880 /* unicode string area must be word-aligned */
881 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
882 ++bcc_ptr;
883 --bytes_remaining;
884 }
885 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
886 sess_data->nls_cp);
887 } else {
888 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
889 sess_data->nls_cp);
890 }
891
892 rc = sess_establish_session(sess_data);
893 out:
894 sess_data->result = rc;
895 sess_data->func = NULL;
896 sess_free_buffer(sess_data);
897 kfree(ses->auth_key.response);
898 ses->auth_key.response = NULL;
899 }
900
901 static void
sess_auth_ntlmv2(struct sess_data * sess_data)902 sess_auth_ntlmv2(struct sess_data *sess_data)
903 {
904 int rc = 0;
905 struct smb_hdr *smb_buf;
906 SESSION_SETUP_ANDX *pSMB;
907 char *bcc_ptr;
908 struct cifs_ses *ses = sess_data->ses;
909 __u32 capabilities;
910 __u16 bytes_remaining;
911
912 /* old style NTLM sessionsetup */
913 /* wct = 13 */
914 rc = sess_alloc_buffer(sess_data, 13);
915 if (rc)
916 goto out;
917
918 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
919 bcc_ptr = sess_data->iov[2].iov_base;
920 capabilities = cifs_ssetup_hdr(ses, pSMB);
921
922 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
923
924 /* LM2 password would be here if we supported it */
925 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
926
927 if (ses->user_name != NULL) {
928 /* calculate nlmv2 response and session key */
929 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
930 if (rc) {
931 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
932 goto out;
933 }
934
935 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
936 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
937 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
938
939 /* set case sensitive password length after tilen may get
940 * assigned, tilen is 0 otherwise.
941 */
942 pSMB->req_no_secext.CaseSensitivePasswordLength =
943 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
944 } else {
945 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
946 }
947
948 if (ses->capabilities & CAP_UNICODE) {
949 if (sess_data->iov[0].iov_len % 2) {
950 *bcc_ptr = 0;
951 bcc_ptr++;
952 }
953 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
954 } else {
955 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
956 }
957
958
959 sess_data->iov[2].iov_len = (long) bcc_ptr -
960 (long) sess_data->iov[2].iov_base;
961
962 rc = sess_sendreceive(sess_data);
963 if (rc)
964 goto out;
965
966 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
967 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
968
969 if (smb_buf->WordCount != 3) {
970 rc = -EIO;
971 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
972 goto out;
973 }
974
975 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
976 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
977
978 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
979 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
980
981 bytes_remaining = get_bcc(smb_buf);
982 bcc_ptr = pByteArea(smb_buf);
983
984 /* BB check if Unicode and decode strings */
985 if (bytes_remaining == 0) {
986 /* no string area to decode, do nothing */
987 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
988 /* unicode string area must be word-aligned */
989 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
990 ++bcc_ptr;
991 --bytes_remaining;
992 }
993 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
994 sess_data->nls_cp);
995 } else {
996 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
997 sess_data->nls_cp);
998 }
999
1000 rc = sess_establish_session(sess_data);
1001 out:
1002 sess_data->result = rc;
1003 sess_data->func = NULL;
1004 sess_free_buffer(sess_data);
1005 kfree(ses->auth_key.response);
1006 ses->auth_key.response = NULL;
1007 }
1008
1009 #ifdef CONFIG_CIFS_UPCALL
1010 static void
sess_auth_kerberos(struct sess_data * sess_data)1011 sess_auth_kerberos(struct sess_data *sess_data)
1012 {
1013 int rc = 0;
1014 struct smb_hdr *smb_buf;
1015 SESSION_SETUP_ANDX *pSMB;
1016 char *bcc_ptr;
1017 struct cifs_ses *ses = sess_data->ses;
1018 __u32 capabilities;
1019 __u16 bytes_remaining;
1020 struct key *spnego_key = NULL;
1021 struct cifs_spnego_msg *msg;
1022 u16 blob_len;
1023
1024 /* extended security */
1025 /* wct = 12 */
1026 rc = sess_alloc_buffer(sess_data, 12);
1027 if (rc)
1028 goto out;
1029
1030 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1031 bcc_ptr = sess_data->iov[2].iov_base;
1032 capabilities = cifs_ssetup_hdr(ses, pSMB);
1033
1034 spnego_key = cifs_get_spnego_key(ses);
1035 if (IS_ERR(spnego_key)) {
1036 rc = PTR_ERR(spnego_key);
1037 spnego_key = NULL;
1038 goto out;
1039 }
1040
1041 msg = spnego_key->payload.data[0];
1042 /*
1043 * check version field to make sure that cifs.upcall is
1044 * sending us a response in an expected form
1045 */
1046 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1047 cifs_dbg(VFS,
1048 "incorrect version of cifs.upcall (expected %d but got %d)",
1049 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1050 rc = -EKEYREJECTED;
1051 goto out_put_spnego_key;
1052 }
1053
1054 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1055 GFP_KERNEL);
1056 if (!ses->auth_key.response) {
1057 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory",
1058 msg->sesskey_len);
1059 rc = -ENOMEM;
1060 goto out_put_spnego_key;
1061 }
1062 ses->auth_key.len = msg->sesskey_len;
1063
1064 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1065 capabilities |= CAP_EXTENDED_SECURITY;
1066 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1067 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1068 sess_data->iov[1].iov_len = msg->secblob_len;
1069 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1070
1071 if (ses->capabilities & CAP_UNICODE) {
1072 /* unicode strings must be word aligned */
1073 if ((sess_data->iov[0].iov_len
1074 + sess_data->iov[1].iov_len) % 2) {
1075 *bcc_ptr = 0;
1076 bcc_ptr++;
1077 }
1078 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1079 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1080 } else {
1081 /* BB: is this right? */
1082 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1083 }
1084
1085 sess_data->iov[2].iov_len = (long) bcc_ptr -
1086 (long) sess_data->iov[2].iov_base;
1087
1088 rc = sess_sendreceive(sess_data);
1089 if (rc)
1090 goto out_put_spnego_key;
1091
1092 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1093 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1094
1095 if (smb_buf->WordCount != 4) {
1096 rc = -EIO;
1097 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1098 goto out_put_spnego_key;
1099 }
1100
1101 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1102 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1103
1104 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1105 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1106
1107 bytes_remaining = get_bcc(smb_buf);
1108 bcc_ptr = pByteArea(smb_buf);
1109
1110 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1111 if (blob_len > bytes_remaining) {
1112 cifs_dbg(VFS, "bad security blob length %d\n",
1113 blob_len);
1114 rc = -EINVAL;
1115 goto out_put_spnego_key;
1116 }
1117 bcc_ptr += blob_len;
1118 bytes_remaining -= blob_len;
1119
1120 /* BB check if Unicode and decode strings */
1121 if (bytes_remaining == 0) {
1122 /* no string area to decode, do nothing */
1123 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1124 /* unicode string area must be word-aligned */
1125 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1126 ++bcc_ptr;
1127 --bytes_remaining;
1128 }
1129 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1130 sess_data->nls_cp);
1131 } else {
1132 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1133 sess_data->nls_cp);
1134 }
1135
1136 rc = sess_establish_session(sess_data);
1137 out_put_spnego_key:
1138 key_invalidate(spnego_key);
1139 key_put(spnego_key);
1140 out:
1141 sess_data->result = rc;
1142 sess_data->func = NULL;
1143 sess_free_buffer(sess_data);
1144 kfree(ses->auth_key.response);
1145 ses->auth_key.response = NULL;
1146 }
1147
1148 #endif /* ! CONFIG_CIFS_UPCALL */
1149
1150 /*
1151 * The required kvec buffers have to be allocated before calling this
1152 * function.
1153 */
1154 static int
_sess_auth_rawntlmssp_assemble_req(struct sess_data * sess_data)1155 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1156 {
1157 struct smb_hdr *smb_buf;
1158 SESSION_SETUP_ANDX *pSMB;
1159 struct cifs_ses *ses = sess_data->ses;
1160 __u32 capabilities;
1161 char *bcc_ptr;
1162
1163 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1164 smb_buf = (struct smb_hdr *)pSMB;
1165
1166 capabilities = cifs_ssetup_hdr(ses, pSMB);
1167 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1168 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1169 return -ENOSYS;
1170 }
1171
1172 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1173 capabilities |= CAP_EXTENDED_SECURITY;
1174 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1175
1176 bcc_ptr = sess_data->iov[2].iov_base;
1177 /* unicode strings must be word aligned */
1178 if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1179 *bcc_ptr = 0;
1180 bcc_ptr++;
1181 }
1182 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1183
1184 sess_data->iov[2].iov_len = (long) bcc_ptr -
1185 (long) sess_data->iov[2].iov_base;
1186
1187 return 0;
1188 }
1189
1190 static void
1191 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1192
1193 static void
sess_auth_rawntlmssp_negotiate(struct sess_data * sess_data)1194 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1195 {
1196 int rc;
1197 struct smb_hdr *smb_buf;
1198 SESSION_SETUP_ANDX *pSMB;
1199 struct cifs_ses *ses = sess_data->ses;
1200 __u16 bytes_remaining;
1201 char *bcc_ptr;
1202 u16 blob_len;
1203
1204 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1205
1206 /*
1207 * if memory allocation is successful, caller of this function
1208 * frees it.
1209 */
1210 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1211 if (!ses->ntlmssp) {
1212 rc = -ENOMEM;
1213 goto out;
1214 }
1215 ses->ntlmssp->sesskey_per_smbsess = false;
1216
1217 /* wct = 12 */
1218 rc = sess_alloc_buffer(sess_data, 12);
1219 if (rc)
1220 goto out;
1221
1222 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1223
1224 /* Build security blob before we assemble the request */
1225 build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
1226 sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
1227 sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
1228 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
1229
1230 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1231 if (rc)
1232 goto out;
1233
1234 rc = sess_sendreceive(sess_data);
1235
1236 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1237 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1238
1239 /* If true, rc here is expected and not an error */
1240 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1241 smb_buf->Status.CifsError ==
1242 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1243 rc = 0;
1244
1245 if (rc)
1246 goto out;
1247
1248 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1249
1250 if (smb_buf->WordCount != 4) {
1251 rc = -EIO;
1252 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1253 goto out;
1254 }
1255
1256 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1257 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1258
1259 bytes_remaining = get_bcc(smb_buf);
1260 bcc_ptr = pByteArea(smb_buf);
1261
1262 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1263 if (blob_len > bytes_remaining) {
1264 cifs_dbg(VFS, "bad security blob length %d\n",
1265 blob_len);
1266 rc = -EINVAL;
1267 goto out;
1268 }
1269
1270 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1271 out:
1272 sess_free_buffer(sess_data);
1273
1274 if (!rc) {
1275 sess_data->func = sess_auth_rawntlmssp_authenticate;
1276 return;
1277 }
1278
1279 /* Else error. Cleanup */
1280 kfree(ses->auth_key.response);
1281 ses->auth_key.response = NULL;
1282 kfree(ses->ntlmssp);
1283 ses->ntlmssp = NULL;
1284
1285 sess_data->func = NULL;
1286 sess_data->result = rc;
1287 }
1288
1289 static void
sess_auth_rawntlmssp_authenticate(struct sess_data * sess_data)1290 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1291 {
1292 int rc;
1293 struct smb_hdr *smb_buf;
1294 SESSION_SETUP_ANDX *pSMB;
1295 struct cifs_ses *ses = sess_data->ses;
1296 __u16 bytes_remaining;
1297 char *bcc_ptr;
1298 unsigned char *ntlmsspblob = NULL;
1299 u16 blob_len;
1300
1301 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1302
1303 /* wct = 12 */
1304 rc = sess_alloc_buffer(sess_data, 12);
1305 if (rc)
1306 goto out;
1307
1308 /* Build security blob before we assemble the request */
1309 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1310 smb_buf = (struct smb_hdr *)pSMB;
1311 rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1312 &blob_len, ses, sess_data->nls_cp);
1313 if (rc)
1314 goto out_free_ntlmsspblob;
1315 sess_data->iov[1].iov_len = blob_len;
1316 sess_data->iov[1].iov_base = ntlmsspblob;
1317 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1318 /*
1319 * Make sure that we tell the server that we are using
1320 * the uid that it just gave us back on the response
1321 * (challenge)
1322 */
1323 smb_buf->Uid = ses->Suid;
1324
1325 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1326 if (rc)
1327 goto out_free_ntlmsspblob;
1328
1329 rc = sess_sendreceive(sess_data);
1330 if (rc)
1331 goto out_free_ntlmsspblob;
1332
1333 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1334 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1335 if (smb_buf->WordCount != 4) {
1336 rc = -EIO;
1337 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1338 goto out_free_ntlmsspblob;
1339 }
1340
1341 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1342 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1343
1344 if (ses->Suid != smb_buf->Uid) {
1345 ses->Suid = smb_buf->Uid;
1346 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1347 }
1348
1349 bytes_remaining = get_bcc(smb_buf);
1350 bcc_ptr = pByteArea(smb_buf);
1351 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1352 if (blob_len > bytes_remaining) {
1353 cifs_dbg(VFS, "bad security blob length %d\n",
1354 blob_len);
1355 rc = -EINVAL;
1356 goto out_free_ntlmsspblob;
1357 }
1358 bcc_ptr += blob_len;
1359 bytes_remaining -= blob_len;
1360
1361
1362 /* BB check if Unicode and decode strings */
1363 if (bytes_remaining == 0) {
1364 /* no string area to decode, do nothing */
1365 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1366 /* unicode string area must be word-aligned */
1367 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1368 ++bcc_ptr;
1369 --bytes_remaining;
1370 }
1371 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1372 sess_data->nls_cp);
1373 } else {
1374 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1375 sess_data->nls_cp);
1376 }
1377
1378 out_free_ntlmsspblob:
1379 kfree(ntlmsspblob);
1380 out:
1381 sess_free_buffer(sess_data);
1382
1383 if (!rc)
1384 rc = sess_establish_session(sess_data);
1385
1386 /* Cleanup */
1387 kfree(ses->auth_key.response);
1388 ses->auth_key.response = NULL;
1389 kfree(ses->ntlmssp);
1390 ses->ntlmssp = NULL;
1391
1392 sess_data->func = NULL;
1393 sess_data->result = rc;
1394 }
1395
select_sec(struct cifs_ses * ses,struct sess_data * sess_data)1396 static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
1397 {
1398 int type;
1399
1400 type = cifs_select_sectype(ses->server, ses->sectype);
1401 cifs_dbg(FYI, "sess setup type %d\n", type);
1402 if (type == Unspecified) {
1403 cifs_dbg(VFS,
1404 "Unable to select appropriate authentication method!");
1405 return -EINVAL;
1406 }
1407
1408 switch (type) {
1409 case LANMAN:
1410 /* LANMAN and plaintext are less secure and off by default.
1411 * So we make this explicitly be turned on in kconfig (in the
1412 * build) and turned on at runtime (changed from the default)
1413 * in proc/fs/cifs or via mount parm. Unfortunately this is
1414 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
1415 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1416 sess_data->func = sess_auth_lanman;
1417 break;
1418 #else
1419 return -EOPNOTSUPP;
1420 #endif
1421 case NTLM:
1422 sess_data->func = sess_auth_ntlm;
1423 break;
1424 case NTLMv2:
1425 sess_data->func = sess_auth_ntlmv2;
1426 break;
1427 case Kerberos:
1428 #ifdef CONFIG_CIFS_UPCALL
1429 sess_data->func = sess_auth_kerberos;
1430 break;
1431 #else
1432 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1433 return -ENOSYS;
1434 break;
1435 #endif /* CONFIG_CIFS_UPCALL */
1436 case RawNTLMSSP:
1437 sess_data->func = sess_auth_rawntlmssp_negotiate;
1438 break;
1439 default:
1440 cifs_dbg(VFS, "secType %d not supported!\n", type);
1441 return -ENOSYS;
1442 }
1443
1444 return 0;
1445 }
1446
CIFS_SessSetup(const unsigned int xid,struct cifs_ses * ses,const struct nls_table * nls_cp)1447 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1448 const struct nls_table *nls_cp)
1449 {
1450 int rc = 0;
1451 struct sess_data *sess_data;
1452
1453 if (ses == NULL) {
1454 WARN(1, "%s: ses == NULL!", __func__);
1455 return -EINVAL;
1456 }
1457
1458 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1459 if (!sess_data)
1460 return -ENOMEM;
1461
1462 rc = select_sec(ses, sess_data);
1463 if (rc)
1464 goto out;
1465
1466 sess_data->xid = xid;
1467 sess_data->ses = ses;
1468 sess_data->buf0_type = CIFS_NO_BUFFER;
1469 sess_data->nls_cp = (struct nls_table *) nls_cp;
1470
1471 while (sess_data->func)
1472 sess_data->func(sess_data);
1473
1474 /* Store result before we free sess_data */
1475 rc = sess_data->result;
1476
1477 out:
1478 kfree(sess_data);
1479 return rc;
1480 }
1481
