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 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
402
403 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
404 sec_blob->MessageType = NtLmAuthenticate;
405
406 flags = NTLMSSP_NEGOTIATE_56 |
407 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
408 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
409 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
410 NTLMSSP_NEGOTIATE_SEAL;
411 if (ses->server->sign)
412 flags |= NTLMSSP_NEGOTIATE_SIGN;
413 if (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
414 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
415
416 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
417 sec_blob->NegotiateFlags = cpu_to_le32(flags);
418
419 sec_blob->LmChallengeResponse.BufferOffset =
420 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
421 sec_blob->LmChallengeResponse.Length = 0;
422 sec_blob->LmChallengeResponse.MaximumLength = 0;
423
424 sec_blob->NtChallengeResponse.BufferOffset =
425 cpu_to_le32(tmp - *pbuffer);
426 if (ses->user_name != NULL) {
427 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
428 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
429 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
430
431 sec_blob->NtChallengeResponse.Length =
432 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
433 sec_blob->NtChallengeResponse.MaximumLength =
434 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
435 } else {
436 /*
437 * don't send an NT Response for anonymous access
438 */
439 sec_blob->NtChallengeResponse.Length = 0;
440 sec_blob->NtChallengeResponse.MaximumLength = 0;
441 }
442
443 if (ses->domainName == NULL) {
444 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
445 sec_blob->DomainName.Length = 0;
446 sec_blob->DomainName.MaximumLength = 0;
447 tmp += 2;
448 } else {
449 int len;
450 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
451 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
452 len *= 2; /* unicode is 2 bytes each */
453 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
454 sec_blob->DomainName.Length = cpu_to_le16(len);
455 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
456 tmp += len;
457 }
458
459 if (ses->user_name == NULL) {
460 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
461 sec_blob->UserName.Length = 0;
462 sec_blob->UserName.MaximumLength = 0;
463 tmp += 2;
464 } else {
465 int len;
466 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
467 CIFS_MAX_USERNAME_LEN, nls_cp);
468 len *= 2; /* unicode is 2 bytes each */
469 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
470 sec_blob->UserName.Length = cpu_to_le16(len);
471 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
472 tmp += len;
473 }
474
475 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
476 sec_blob->WorkstationName.Length = 0;
477 sec_blob->WorkstationName.MaximumLength = 0;
478 tmp += 2;
479
480 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
481 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
482 && !calc_seckey(ses)) {
483 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
484 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
485 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
486 sec_blob->SessionKey.MaximumLength =
487 cpu_to_le16(CIFS_CPHTXT_SIZE);
488 tmp += CIFS_CPHTXT_SIZE;
489 } else {
490 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
491 sec_blob->SessionKey.Length = 0;
492 sec_blob->SessionKey.MaximumLength = 0;
493 }
494
495 *buflen = tmp - *pbuffer;
496 setup_ntlmv2_ret:
497 return rc;
498 }
499
500 enum securityEnum
select_sectype(struct TCP_Server_Info * server,enum securityEnum requested)501 select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
502 {
503 switch (server->negflavor) {
504 case CIFS_NEGFLAVOR_EXTENDED:
505 switch (requested) {
506 case Kerberos:
507 case RawNTLMSSP:
508 return requested;
509 case Unspecified:
510 if (server->sec_ntlmssp &&
511 (global_secflags & CIFSSEC_MAY_NTLMSSP))
512 return RawNTLMSSP;
513 if ((server->sec_kerberos || server->sec_mskerberos) &&
514 (global_secflags & CIFSSEC_MAY_KRB5))
515 return Kerberos;
516 /* Fallthrough */
517 default:
518 return Unspecified;
519 }
520 case CIFS_NEGFLAVOR_UNENCAP:
521 switch (requested) {
522 case NTLM:
523 case NTLMv2:
524 return requested;
525 case Unspecified:
526 if (global_secflags & CIFSSEC_MAY_NTLMV2)
527 return NTLMv2;
528 if (global_secflags & CIFSSEC_MAY_NTLM)
529 return NTLM;
530 default:
531 /* Fallthrough to attempt LANMAN authentication next */
532 break;
533 }
534 case CIFS_NEGFLAVOR_LANMAN:
535 switch (requested) {
536 case LANMAN:
537 return requested;
538 case Unspecified:
539 if (global_secflags & CIFSSEC_MAY_LANMAN)
540 return LANMAN;
541 /* Fallthrough */
542 default:
543 return Unspecified;
544 }
545 default:
546 return Unspecified;
547 }
548 }
549
550 struct sess_data {
551 unsigned int xid;
552 struct cifs_ses *ses;
553 struct nls_table *nls_cp;
554 void (*func)(struct sess_data *);
555 int result;
556
557 /* we will send the SMB in three pieces:
558 * a fixed length beginning part, an optional
559 * SPNEGO blob (which can be zero length), and a
560 * last part which will include the strings
561 * and rest of bcc area. This allows us to avoid
562 * a large buffer 17K allocation
563 */
564 int buf0_type;
565 struct kvec iov[3];
566 };
567
568 static int
sess_alloc_buffer(struct sess_data * sess_data,int wct)569 sess_alloc_buffer(struct sess_data *sess_data, int wct)
570 {
571 int rc;
572 struct cifs_ses *ses = sess_data->ses;
573 struct smb_hdr *smb_buf;
574
575 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
576 (void **)&smb_buf);
577
578 if (rc)
579 return rc;
580
581 sess_data->iov[0].iov_base = (char *)smb_buf;
582 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
583 /*
584 * This variable will be used to clear the buffer
585 * allocated above in case of any error in the calling function.
586 */
587 sess_data->buf0_type = CIFS_SMALL_BUFFER;
588
589 /* 2000 big enough to fit max user, domain, NOS name etc. */
590 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
591 if (!sess_data->iov[2].iov_base) {
592 rc = -ENOMEM;
593 goto out_free_smb_buf;
594 }
595
596 return 0;
597
598 out_free_smb_buf:
599 kfree(smb_buf);
600 sess_data->iov[0].iov_base = NULL;
601 sess_data->iov[0].iov_len = 0;
602 sess_data->buf0_type = CIFS_NO_BUFFER;
603 return rc;
604 }
605
606 static void
sess_free_buffer(struct sess_data * sess_data)607 sess_free_buffer(struct sess_data *sess_data)
608 {
609
610 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
611 sess_data->buf0_type = CIFS_NO_BUFFER;
612 kfree(sess_data->iov[2].iov_base);
613 }
614
615 static int
sess_establish_session(struct sess_data * sess_data)616 sess_establish_session(struct sess_data *sess_data)
617 {
618 struct cifs_ses *ses = sess_data->ses;
619
620 mutex_lock(&ses->server->srv_mutex);
621 if (!ses->server->session_estab) {
622 if (ses->server->sign) {
623 ses->server->session_key.response =
624 kmemdup(ses->auth_key.response,
625 ses->auth_key.len, GFP_KERNEL);
626 if (!ses->server->session_key.response) {
627 mutex_unlock(&ses->server->srv_mutex);
628 return -ENOMEM;
629 }
630 ses->server->session_key.len =
631 ses->auth_key.len;
632 }
633 ses->server->sequence_number = 0x2;
634 ses->server->session_estab = true;
635 }
636 mutex_unlock(&ses->server->srv_mutex);
637
638 cifs_dbg(FYI, "CIFS session established successfully\n");
639 spin_lock(&GlobalMid_Lock);
640 ses->status = CifsGood;
641 ses->need_reconnect = false;
642 spin_unlock(&GlobalMid_Lock);
643
644 return 0;
645 }
646
647 static int
sess_sendreceive(struct sess_data * sess_data)648 sess_sendreceive(struct sess_data *sess_data)
649 {
650 int rc;
651 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
652 __u16 count;
653
654 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
655 smb_buf->smb_buf_length =
656 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
657 put_bcc(count, smb_buf);
658
659 rc = SendReceive2(sess_data->xid, sess_data->ses,
660 sess_data->iov, 3 /* num_iovecs */,
661 &sess_data->buf0_type,
662 CIFS_LOG_ERROR);
663
664 return rc;
665 }
666
667 /*
668 * LANMAN and plaintext are less secure and off by default.
669 * So we make this explicitly be turned on in kconfig (in the
670 * build) and turned on at runtime (changed from the default)
671 * in proc/fs/cifs or via mount parm. Unfortunately this is
672 * needed for old Win (e.g. Win95), some obscure NAS and OS/2
673 */
674 #ifdef CONFIG_CIFS_WEAK_PW_HASH
675 static void
sess_auth_lanman(struct sess_data * sess_data)676 sess_auth_lanman(struct sess_data *sess_data)
677 {
678 int rc = 0;
679 struct smb_hdr *smb_buf;
680 SESSION_SETUP_ANDX *pSMB;
681 char *bcc_ptr;
682 struct cifs_ses *ses = sess_data->ses;
683 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
684 __u32 capabilities;
685 __u16 bytes_remaining;
686
687 /* lanman 2 style sessionsetup */
688 /* wct = 10 */
689 rc = sess_alloc_buffer(sess_data, 10);
690 if (rc)
691 goto out;
692
693 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
694 bcc_ptr = sess_data->iov[2].iov_base;
695 capabilities = cifs_ssetup_hdr(ses, pSMB);
696
697 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
698
699 if (ses->user_name != NULL) {
700 /* no capabilities flags in old lanman negotiation */
701 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
702
703 /* Calculate hash with password and copy into bcc_ptr.
704 * Encryption Key (stored as in cryptkey) gets used if the
705 * security mode bit in Negottiate Protocol response states
706 * to use challenge/response method (i.e. Password bit is 1).
707 */
708 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
709 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
710 true : false, lnm_session_key);
711 if (rc)
712 goto out;
713
714 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
715 bcc_ptr += CIFS_AUTH_RESP_SIZE;
716 } else {
717 pSMB->old_req.PasswordLength = 0;
718 }
719
720 /*
721 * can not sign if LANMAN negotiated so no need
722 * to calculate signing key? but what if server
723 * changed to do higher than lanman dialect and
724 * we reconnected would we ever calc signing_key?
725 */
726
727 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
728 /* Unicode not allowed for LANMAN dialects */
729 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
730
731 sess_data->iov[2].iov_len = (long) bcc_ptr -
732 (long) sess_data->iov[2].iov_base;
733
734 rc = sess_sendreceive(sess_data);
735 if (rc)
736 goto out;
737
738 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
739 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
740
741 /* lanman response has a word count of 3 */
742 if (smb_buf->WordCount != 3) {
743 rc = -EIO;
744 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
745 goto out;
746 }
747
748 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
749 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
750
751 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
752 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
753
754 bytes_remaining = get_bcc(smb_buf);
755 bcc_ptr = pByteArea(smb_buf);
756
757 /* BB check if Unicode and decode strings */
758 if (bytes_remaining == 0) {
759 /* no string area to decode, do nothing */
760 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
761 /* unicode string area must be word-aligned */
762 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
763 ++bcc_ptr;
764 --bytes_remaining;
765 }
766 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
767 sess_data->nls_cp);
768 } else {
769 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
770 sess_data->nls_cp);
771 }
772
773 rc = sess_establish_session(sess_data);
774 out:
775 sess_data->result = rc;
776 sess_data->func = NULL;
777 sess_free_buffer(sess_data);
778 }
779
780 #endif
781
782 static void
sess_auth_ntlm(struct sess_data * sess_data)783 sess_auth_ntlm(struct sess_data *sess_data)
784 {
785 int rc = 0;
786 struct smb_hdr *smb_buf;
787 SESSION_SETUP_ANDX *pSMB;
788 char *bcc_ptr;
789 struct cifs_ses *ses = sess_data->ses;
790 __u32 capabilities;
791 __u16 bytes_remaining;
792
793 /* old style NTLM sessionsetup */
794 /* wct = 13 */
795 rc = sess_alloc_buffer(sess_data, 13);
796 if (rc)
797 goto out;
798
799 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
800 bcc_ptr = sess_data->iov[2].iov_base;
801 capabilities = cifs_ssetup_hdr(ses, pSMB);
802
803 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
804 if (ses->user_name != NULL) {
805 pSMB->req_no_secext.CaseInsensitivePasswordLength =
806 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
807 pSMB->req_no_secext.CaseSensitivePasswordLength =
808 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
809
810 /* calculate ntlm response and session key */
811 rc = setup_ntlm_response(ses, sess_data->nls_cp);
812 if (rc) {
813 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
814 rc);
815 goto out;
816 }
817
818 /* copy ntlm response */
819 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
820 CIFS_AUTH_RESP_SIZE);
821 bcc_ptr += CIFS_AUTH_RESP_SIZE;
822 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
823 CIFS_AUTH_RESP_SIZE);
824 bcc_ptr += CIFS_AUTH_RESP_SIZE;
825 } else {
826 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
827 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
828 }
829
830 if (ses->capabilities & CAP_UNICODE) {
831 /* unicode strings must be word aligned */
832 if (sess_data->iov[0].iov_len % 2) {
833 *bcc_ptr = 0;
834 bcc_ptr++;
835 }
836 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
837 } else {
838 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
839 }
840
841
842 sess_data->iov[2].iov_len = (long) bcc_ptr -
843 (long) sess_data->iov[2].iov_base;
844
845 rc = sess_sendreceive(sess_data);
846 if (rc)
847 goto out;
848
849 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
850 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
851
852 if (smb_buf->WordCount != 3) {
853 rc = -EIO;
854 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
855 goto out;
856 }
857
858 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
859 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
860
861 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
862 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
863
864 bytes_remaining = get_bcc(smb_buf);
865 bcc_ptr = pByteArea(smb_buf);
866
867 /* BB check if Unicode and decode strings */
868 if (bytes_remaining == 0) {
869 /* no string area to decode, do nothing */
870 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
871 /* unicode string area must be word-aligned */
872 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
873 ++bcc_ptr;
874 --bytes_remaining;
875 }
876 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
877 sess_data->nls_cp);
878 } else {
879 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
880 sess_data->nls_cp);
881 }
882
883 rc = sess_establish_session(sess_data);
884 out:
885 sess_data->result = rc;
886 sess_data->func = NULL;
887 sess_free_buffer(sess_data);
888 kfree(ses->auth_key.response);
889 ses->auth_key.response = NULL;
890 }
891
892 static void
sess_auth_ntlmv2(struct sess_data * sess_data)893 sess_auth_ntlmv2(struct sess_data *sess_data)
894 {
895 int rc = 0;
896 struct smb_hdr *smb_buf;
897 SESSION_SETUP_ANDX *pSMB;
898 char *bcc_ptr;
899 struct cifs_ses *ses = sess_data->ses;
900 __u32 capabilities;
901 __u16 bytes_remaining;
902
903 /* old style NTLM sessionsetup */
904 /* wct = 13 */
905 rc = sess_alloc_buffer(sess_data, 13);
906 if (rc)
907 goto out;
908
909 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
910 bcc_ptr = sess_data->iov[2].iov_base;
911 capabilities = cifs_ssetup_hdr(ses, pSMB);
912
913 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
914
915 /* LM2 password would be here if we supported it */
916 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
917
918 if (ses->user_name != NULL) {
919 /* calculate nlmv2 response and session key */
920 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
921 if (rc) {
922 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
923 goto out;
924 }
925
926 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
927 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
928 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
929
930 /* set case sensitive password length after tilen may get
931 * assigned, tilen is 0 otherwise.
932 */
933 pSMB->req_no_secext.CaseSensitivePasswordLength =
934 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
935 } else {
936 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
937 }
938
939 if (ses->capabilities & CAP_UNICODE) {
940 if (sess_data->iov[0].iov_len % 2) {
941 *bcc_ptr = 0;
942 bcc_ptr++;
943 }
944 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
945 } else {
946 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
947 }
948
949
950 sess_data->iov[2].iov_len = (long) bcc_ptr -
951 (long) sess_data->iov[2].iov_base;
952
953 rc = sess_sendreceive(sess_data);
954 if (rc)
955 goto out;
956
957 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
958 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
959
960 if (smb_buf->WordCount != 3) {
961 rc = -EIO;
962 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
963 goto out;
964 }
965
966 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
967 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
968
969 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
970 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
971
972 bytes_remaining = get_bcc(smb_buf);
973 bcc_ptr = pByteArea(smb_buf);
974
975 /* BB check if Unicode and decode strings */
976 if (bytes_remaining == 0) {
977 /* no string area to decode, do nothing */
978 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
979 /* unicode string area must be word-aligned */
980 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
981 ++bcc_ptr;
982 --bytes_remaining;
983 }
984 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
985 sess_data->nls_cp);
986 } else {
987 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
988 sess_data->nls_cp);
989 }
990
991 rc = sess_establish_session(sess_data);
992 out:
993 sess_data->result = rc;
994 sess_data->func = NULL;
995 sess_free_buffer(sess_data);
996 kfree(ses->auth_key.response);
997 ses->auth_key.response = NULL;
998 }
999
1000 #ifdef CONFIG_CIFS_UPCALL
1001 static void
sess_auth_kerberos(struct sess_data * sess_data)1002 sess_auth_kerberos(struct sess_data *sess_data)
1003 {
1004 int rc = 0;
1005 struct smb_hdr *smb_buf;
1006 SESSION_SETUP_ANDX *pSMB;
1007 char *bcc_ptr;
1008 struct cifs_ses *ses = sess_data->ses;
1009 __u32 capabilities;
1010 __u16 bytes_remaining;
1011 struct key *spnego_key = NULL;
1012 struct cifs_spnego_msg *msg;
1013 u16 blob_len;
1014
1015 /* extended security */
1016 /* wct = 12 */
1017 rc = sess_alloc_buffer(sess_data, 12);
1018 if (rc)
1019 goto out;
1020
1021 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1022 bcc_ptr = sess_data->iov[2].iov_base;
1023 capabilities = cifs_ssetup_hdr(ses, pSMB);
1024
1025 spnego_key = cifs_get_spnego_key(ses);
1026 if (IS_ERR(spnego_key)) {
1027 rc = PTR_ERR(spnego_key);
1028 spnego_key = NULL;
1029 goto out;
1030 }
1031
1032 msg = spnego_key->payload.data[0];
1033 /*
1034 * check version field to make sure that cifs.upcall is
1035 * sending us a response in an expected form
1036 */
1037 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1038 cifs_dbg(VFS,
1039 "incorrect version of cifs.upcall (expected %d but got %d)",
1040 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1041 rc = -EKEYREJECTED;
1042 goto out_put_spnego_key;
1043 }
1044
1045 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1046 GFP_KERNEL);
1047 if (!ses->auth_key.response) {
1048 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory",
1049 msg->sesskey_len);
1050 rc = -ENOMEM;
1051 goto out_put_spnego_key;
1052 }
1053 ses->auth_key.len = msg->sesskey_len;
1054
1055 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1056 capabilities |= CAP_EXTENDED_SECURITY;
1057 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1058 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1059 sess_data->iov[1].iov_len = msg->secblob_len;
1060 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1061
1062 if (ses->capabilities & CAP_UNICODE) {
1063 /* unicode strings must be word aligned */
1064 if ((sess_data->iov[0].iov_len
1065 + sess_data->iov[1].iov_len) % 2) {
1066 *bcc_ptr = 0;
1067 bcc_ptr++;
1068 }
1069 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1070 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1071 } else {
1072 /* BB: is this right? */
1073 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1074 }
1075
1076 sess_data->iov[2].iov_len = (long) bcc_ptr -
1077 (long) sess_data->iov[2].iov_base;
1078
1079 rc = sess_sendreceive(sess_data);
1080 if (rc)
1081 goto out_put_spnego_key;
1082
1083 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1084 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1085
1086 if (smb_buf->WordCount != 4) {
1087 rc = -EIO;
1088 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1089 goto out_put_spnego_key;
1090 }
1091
1092 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1093 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1094
1095 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1096 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1097
1098 bytes_remaining = get_bcc(smb_buf);
1099 bcc_ptr = pByteArea(smb_buf);
1100
1101 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1102 if (blob_len > bytes_remaining) {
1103 cifs_dbg(VFS, "bad security blob length %d\n",
1104 blob_len);
1105 rc = -EINVAL;
1106 goto out_put_spnego_key;
1107 }
1108 bcc_ptr += blob_len;
1109 bytes_remaining -= blob_len;
1110
1111 /* BB check if Unicode and decode strings */
1112 if (bytes_remaining == 0) {
1113 /* no string area to decode, do nothing */
1114 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1115 /* unicode string area must be word-aligned */
1116 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1117 ++bcc_ptr;
1118 --bytes_remaining;
1119 }
1120 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1121 sess_data->nls_cp);
1122 } else {
1123 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1124 sess_data->nls_cp);
1125 }
1126
1127 rc = sess_establish_session(sess_data);
1128 out_put_spnego_key:
1129 key_invalidate(spnego_key);
1130 key_put(spnego_key);
1131 out:
1132 sess_data->result = rc;
1133 sess_data->func = NULL;
1134 sess_free_buffer(sess_data);
1135 kfree(ses->auth_key.response);
1136 ses->auth_key.response = NULL;
1137 }
1138
1139 #endif /* ! CONFIG_CIFS_UPCALL */
1140
1141 /*
1142 * The required kvec buffers have to be allocated before calling this
1143 * function.
1144 */
1145 static int
_sess_auth_rawntlmssp_assemble_req(struct sess_data * sess_data)1146 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1147 {
1148 struct smb_hdr *smb_buf;
1149 SESSION_SETUP_ANDX *pSMB;
1150 struct cifs_ses *ses = sess_data->ses;
1151 __u32 capabilities;
1152 char *bcc_ptr;
1153
1154 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1155 smb_buf = (struct smb_hdr *)pSMB;
1156
1157 capabilities = cifs_ssetup_hdr(ses, pSMB);
1158 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1159 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1160 return -ENOSYS;
1161 }
1162
1163 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1164 capabilities |= CAP_EXTENDED_SECURITY;
1165 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1166
1167 bcc_ptr = sess_data->iov[2].iov_base;
1168 /* unicode strings must be word aligned */
1169 if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1170 *bcc_ptr = 0;
1171 bcc_ptr++;
1172 }
1173 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1174
1175 sess_data->iov[2].iov_len = (long) bcc_ptr -
1176 (long) sess_data->iov[2].iov_base;
1177
1178 return 0;
1179 }
1180
1181 static void
1182 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1183
1184 static void
sess_auth_rawntlmssp_negotiate(struct sess_data * sess_data)1185 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1186 {
1187 int rc;
1188 struct smb_hdr *smb_buf;
1189 SESSION_SETUP_ANDX *pSMB;
1190 struct cifs_ses *ses = sess_data->ses;
1191 __u16 bytes_remaining;
1192 char *bcc_ptr;
1193 u16 blob_len;
1194
1195 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1196
1197 /*
1198 * if memory allocation is successful, caller of this function
1199 * frees it.
1200 */
1201 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1202 if (!ses->ntlmssp) {
1203 rc = -ENOMEM;
1204 goto out;
1205 }
1206 ses->ntlmssp->sesskey_per_smbsess = false;
1207
1208 /* wct = 12 */
1209 rc = sess_alloc_buffer(sess_data, 12);
1210 if (rc)
1211 goto out;
1212
1213 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1214
1215 /* Build security blob before we assemble the request */
1216 build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
1217 sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
1218 sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
1219 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
1220
1221 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1222 if (rc)
1223 goto out;
1224
1225 rc = sess_sendreceive(sess_data);
1226
1227 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1228 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1229
1230 /* If true, rc here is expected and not an error */
1231 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1232 smb_buf->Status.CifsError ==
1233 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1234 rc = 0;
1235
1236 if (rc)
1237 goto out;
1238
1239 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1240
1241 if (smb_buf->WordCount != 4) {
1242 rc = -EIO;
1243 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1244 goto out;
1245 }
1246
1247 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1248 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1249
1250 bytes_remaining = get_bcc(smb_buf);
1251 bcc_ptr = pByteArea(smb_buf);
1252
1253 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1254 if (blob_len > bytes_remaining) {
1255 cifs_dbg(VFS, "bad security blob length %d\n",
1256 blob_len);
1257 rc = -EINVAL;
1258 goto out;
1259 }
1260
1261 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1262 out:
1263 sess_free_buffer(sess_data);
1264
1265 if (!rc) {
1266 sess_data->func = sess_auth_rawntlmssp_authenticate;
1267 return;
1268 }
1269
1270 /* Else error. Cleanup */
1271 kfree(ses->auth_key.response);
1272 ses->auth_key.response = NULL;
1273 kfree(ses->ntlmssp);
1274 ses->ntlmssp = NULL;
1275
1276 sess_data->func = NULL;
1277 sess_data->result = rc;
1278 }
1279
1280 static void
sess_auth_rawntlmssp_authenticate(struct sess_data * sess_data)1281 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1282 {
1283 int rc;
1284 struct smb_hdr *smb_buf;
1285 SESSION_SETUP_ANDX *pSMB;
1286 struct cifs_ses *ses = sess_data->ses;
1287 __u16 bytes_remaining;
1288 char *bcc_ptr;
1289 unsigned char *ntlmsspblob = NULL;
1290 u16 blob_len;
1291
1292 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1293
1294 /* wct = 12 */
1295 rc = sess_alloc_buffer(sess_data, 12);
1296 if (rc)
1297 goto out;
1298
1299 /* Build security blob before we assemble the request */
1300 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1301 smb_buf = (struct smb_hdr *)pSMB;
1302 rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1303 &blob_len, ses, sess_data->nls_cp);
1304 if (rc)
1305 goto out_free_ntlmsspblob;
1306 sess_data->iov[1].iov_len = blob_len;
1307 sess_data->iov[1].iov_base = ntlmsspblob;
1308 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1309 /*
1310 * Make sure that we tell the server that we are using
1311 * the uid that it just gave us back on the response
1312 * (challenge)
1313 */
1314 smb_buf->Uid = ses->Suid;
1315
1316 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1317 if (rc)
1318 goto out_free_ntlmsspblob;
1319
1320 rc = sess_sendreceive(sess_data);
1321 if (rc)
1322 goto out_free_ntlmsspblob;
1323
1324 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1325 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1326 if (smb_buf->WordCount != 4) {
1327 rc = -EIO;
1328 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1329 goto out_free_ntlmsspblob;
1330 }
1331
1332 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1333 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1334
1335 if (ses->Suid != smb_buf->Uid) {
1336 ses->Suid = smb_buf->Uid;
1337 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1338 }
1339
1340 bytes_remaining = get_bcc(smb_buf);
1341 bcc_ptr = pByteArea(smb_buf);
1342 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1343 if (blob_len > bytes_remaining) {
1344 cifs_dbg(VFS, "bad security blob length %d\n",
1345 blob_len);
1346 rc = -EINVAL;
1347 goto out_free_ntlmsspblob;
1348 }
1349 bcc_ptr += blob_len;
1350 bytes_remaining -= blob_len;
1351
1352
1353 /* BB check if Unicode and decode strings */
1354 if (bytes_remaining == 0) {
1355 /* no string area to decode, do nothing */
1356 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1357 /* unicode string area must be word-aligned */
1358 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1359 ++bcc_ptr;
1360 --bytes_remaining;
1361 }
1362 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1363 sess_data->nls_cp);
1364 } else {
1365 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1366 sess_data->nls_cp);
1367 }
1368
1369 out_free_ntlmsspblob:
1370 kfree(ntlmsspblob);
1371 out:
1372 sess_free_buffer(sess_data);
1373
1374 if (!rc)
1375 rc = sess_establish_session(sess_data);
1376
1377 /* Cleanup */
1378 kfree(ses->auth_key.response);
1379 ses->auth_key.response = NULL;
1380 kfree(ses->ntlmssp);
1381 ses->ntlmssp = NULL;
1382
1383 sess_data->func = NULL;
1384 sess_data->result = rc;
1385 }
1386
select_sec(struct cifs_ses * ses,struct sess_data * sess_data)1387 static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
1388 {
1389 int type;
1390
1391 type = select_sectype(ses->server, ses->sectype);
1392 cifs_dbg(FYI, "sess setup type %d\n", type);
1393 if (type == Unspecified) {
1394 cifs_dbg(VFS,
1395 "Unable to select appropriate authentication method!");
1396 return -EINVAL;
1397 }
1398
1399 switch (type) {
1400 case LANMAN:
1401 /* LANMAN and plaintext are less secure and off by default.
1402 * So we make this explicitly be turned on in kconfig (in the
1403 * build) and turned on at runtime (changed from the default)
1404 * in proc/fs/cifs or via mount parm. Unfortunately this is
1405 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
1406 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1407 sess_data->func = sess_auth_lanman;
1408 break;
1409 #else
1410 return -EOPNOTSUPP;
1411 #endif
1412 case NTLM:
1413 sess_data->func = sess_auth_ntlm;
1414 break;
1415 case NTLMv2:
1416 sess_data->func = sess_auth_ntlmv2;
1417 break;
1418 case Kerberos:
1419 #ifdef CONFIG_CIFS_UPCALL
1420 sess_data->func = sess_auth_kerberos;
1421 break;
1422 #else
1423 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1424 return -ENOSYS;
1425 break;
1426 #endif /* CONFIG_CIFS_UPCALL */
1427 case RawNTLMSSP:
1428 sess_data->func = sess_auth_rawntlmssp_negotiate;
1429 break;
1430 default:
1431 cifs_dbg(VFS, "secType %d not supported!\n", type);
1432 return -ENOSYS;
1433 }
1434
1435 return 0;
1436 }
1437
CIFS_SessSetup(const unsigned int xid,struct cifs_ses * ses,const struct nls_table * nls_cp)1438 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1439 const struct nls_table *nls_cp)
1440 {
1441 int rc = 0;
1442 struct sess_data *sess_data;
1443
1444 if (ses == NULL) {
1445 WARN(1, "%s: ses == NULL!", __func__);
1446 return -EINVAL;
1447 }
1448
1449 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1450 if (!sess_data)
1451 return -ENOMEM;
1452
1453 rc = select_sec(ses, sess_data);
1454 if (rc)
1455 goto out;
1456
1457 sess_data->xid = xid;
1458 sess_data->ses = ses;
1459 sess_data->buf0_type = CIFS_NO_BUFFER;
1460 sess_data->nls_cp = (struct nls_table *) nls_cp;
1461
1462 while (sess_data->func)
1463 sess_data->func(sess_data);
1464
1465 /* Store result before we free sess_data */
1466 rc = sess_data->result;
1467
1468 out:
1469 kfree(sess_data);
1470 return rc;
1471 }
1472