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 int len;
163
164 /* copy user */
165 /* BB what about null user mounts - check that we do this BB */
166 /* copy user */
167 if (ses->user_name != NULL) {
168 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
169 if (WARN_ON_ONCE(len < 0))
170 len = CIFS_MAX_USERNAME_LEN - 1;
171 bcc_ptr += len;
172 }
173 /* else null user mount */
174 *bcc_ptr = 0;
175 bcc_ptr++; /* account for null termination */
176
177 /* copy domain */
178 if (ses->domainName != NULL) {
179 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
180 if (WARN_ON_ONCE(len < 0))
181 len = CIFS_MAX_DOMAINNAME_LEN - 1;
182 bcc_ptr += len;
183 } /* else we will send a null domain name
184 so the server will default to its own domain */
185 *bcc_ptr = 0;
186 bcc_ptr++;
187
188 /* BB check for overflow here */
189
190 strcpy(bcc_ptr, "Linux version ");
191 bcc_ptr += strlen("Linux version ");
192 strcpy(bcc_ptr, init_utsname()->release);
193 bcc_ptr += strlen(init_utsname()->release) + 1;
194
195 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
196 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
197
198 *pbcc_area = bcc_ptr;
199 }
200
201 static void
decode_unicode_ssetup(char ** pbcc_area,int bleft,struct cifs_ses * ses,const struct nls_table * nls_cp)202 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
203 const struct nls_table *nls_cp)
204 {
205 int len;
206 char *data = *pbcc_area;
207
208 cifs_dbg(FYI, "bleft %d\n", bleft);
209
210 kfree(ses->serverOS);
211 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
212 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
213 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
214 data += len;
215 bleft -= len;
216 if (bleft <= 0)
217 return;
218
219 kfree(ses->serverNOS);
220 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
221 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
222 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
223 data += len;
224 bleft -= len;
225 if (bleft <= 0)
226 return;
227
228 kfree(ses->serverDomain);
229 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
230 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
231
232 return;
233 }
234
decode_ascii_ssetup(char ** pbcc_area,__u16 bleft,struct cifs_ses * ses,const struct nls_table * nls_cp)235 static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
236 struct cifs_ses *ses,
237 const struct nls_table *nls_cp)
238 {
239 int len;
240 char *bcc_ptr = *pbcc_area;
241
242 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
243
244 len = strnlen(bcc_ptr, bleft);
245 if (len >= bleft)
246 return;
247
248 kfree(ses->serverOS);
249
250 ses->serverOS = kmalloc(len + 1, GFP_KERNEL);
251 if (ses->serverOS) {
252 memcpy(ses->serverOS, bcc_ptr, len);
253 ses->serverOS[len] = 0;
254 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
255 cifs_dbg(FYI, "OS/2 server\n");
256 }
257
258 bcc_ptr += len + 1;
259 bleft -= len + 1;
260
261 len = strnlen(bcc_ptr, bleft);
262 if (len >= bleft)
263 return;
264
265 kfree(ses->serverNOS);
266
267 ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);
268 if (ses->serverNOS) {
269 memcpy(ses->serverNOS, bcc_ptr, len);
270 ses->serverNOS[len] = 0;
271 }
272
273 bcc_ptr += len + 1;
274 bleft -= len + 1;
275
276 len = strnlen(bcc_ptr, bleft);
277 if (len > bleft)
278 return;
279
280 /* No domain field in LANMAN case. Domain is
281 returned by old servers in the SMB negprot response */
282 /* BB For newer servers which do not support Unicode,
283 but thus do return domain here we could add parsing
284 for it later, but it is not very important */
285 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
286 }
287
decode_ntlmssp_challenge(char * bcc_ptr,int blob_len,struct cifs_ses * ses)288 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
289 struct cifs_ses *ses)
290 {
291 unsigned int tioffset; /* challenge message target info area */
292 unsigned int tilen; /* challenge message target info area length */
293
294 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
295
296 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
297 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
298 return -EINVAL;
299 }
300
301 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
302 cifs_dbg(VFS, "blob signature incorrect %s\n",
303 pblob->Signature);
304 return -EINVAL;
305 }
306 if (pblob->MessageType != NtLmChallenge) {
307 cifs_dbg(VFS, "Incorrect message type %d\n",
308 pblob->MessageType);
309 return -EINVAL;
310 }
311
312 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
313 /* BB we could decode pblob->NegotiateFlags; some may be useful */
314 /* In particular we can examine sign flags */
315 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
316 we must set the MIC field of the AUTHENTICATE_MESSAGE */
317 ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags);
318 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
319 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
320 if (tioffset > blob_len || tioffset + tilen > blob_len) {
321 cifs_dbg(VFS, "tioffset + tilen too high %u + %u",
322 tioffset, tilen);
323 return -EINVAL;
324 }
325 if (tilen) {
326 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
327 GFP_KERNEL);
328 if (!ses->auth_key.response) {
329 cifs_dbg(VFS, "Challenge target info alloc failure");
330 return -ENOMEM;
331 }
332 ses->auth_key.len = tilen;
333 }
334
335 return 0;
336 }
337
338 /* BB Move to ntlmssp.c eventually */
339
340 /* We do not malloc the blob, it is passed in pbuffer, because
341 it is fixed size, and small, making this approach cleaner */
build_ntlmssp_negotiate_blob(unsigned char * pbuffer,struct cifs_ses * ses)342 void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
343 struct cifs_ses *ses)
344 {
345 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer;
346 __u32 flags;
347
348 memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
349 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
350 sec_blob->MessageType = NtLmNegotiate;
351
352 /* BB is NTLMV2 session security format easier to use here? */
353 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
354 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
355 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
356 NTLMSSP_NEGOTIATE_SEAL;
357 if (ses->server->sign)
358 flags |= NTLMSSP_NEGOTIATE_SIGN;
359 if (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
360 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
361
362 sec_blob->NegotiateFlags = cpu_to_le32(flags);
363
364 sec_blob->WorkstationName.BufferOffset = 0;
365 sec_blob->WorkstationName.Length = 0;
366 sec_blob->WorkstationName.MaximumLength = 0;
367
368 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
369 sec_blob->DomainName.BufferOffset = 0;
370 sec_blob->DomainName.Length = 0;
371 sec_blob->DomainName.MaximumLength = 0;
372 }
373
size_of_ntlmssp_blob(struct cifs_ses * ses)374 static int size_of_ntlmssp_blob(struct cifs_ses *ses)
375 {
376 int sz = sizeof(AUTHENTICATE_MESSAGE) + ses->auth_key.len
377 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
378
379 if (ses->domainName)
380 sz += 2 * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
381 else
382 sz += 2;
383
384 if (ses->user_name)
385 sz += 2 * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
386 else
387 sz += 2;
388
389 return sz;
390 }
391
build_ntlmssp_auth_blob(unsigned char ** pbuffer,u16 * buflen,struct cifs_ses * ses,const struct nls_table * nls_cp)392 int build_ntlmssp_auth_blob(unsigned char **pbuffer,
393 u16 *buflen,
394 struct cifs_ses *ses,
395 const struct nls_table *nls_cp)
396 {
397 int rc;
398 AUTHENTICATE_MESSAGE *sec_blob;
399 __u32 flags;
400 unsigned char *tmp;
401
402 rc = setup_ntlmv2_rsp(ses, nls_cp);
403 if (rc) {
404 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
405 *buflen = 0;
406 goto setup_ntlmv2_ret;
407 }
408 *pbuffer = kmalloc(size_of_ntlmssp_blob(ses), GFP_KERNEL);
409 if (!*pbuffer) {
410 rc = -ENOMEM;
411 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
412 *buflen = 0;
413 goto setup_ntlmv2_ret;
414 }
415 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
416
417 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
418 sec_blob->MessageType = NtLmAuthenticate;
419
420 flags = NTLMSSP_NEGOTIATE_56 |
421 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
422 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
423 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
424 NTLMSSP_NEGOTIATE_SEAL;
425 if (ses->server->sign)
426 flags |= NTLMSSP_NEGOTIATE_SIGN;
427 if (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
428 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
429
430 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
431 sec_blob->NegotiateFlags = cpu_to_le32(flags);
432
433 sec_blob->LmChallengeResponse.BufferOffset =
434 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
435 sec_blob->LmChallengeResponse.Length = 0;
436 sec_blob->LmChallengeResponse.MaximumLength = 0;
437
438 sec_blob->NtChallengeResponse.BufferOffset =
439 cpu_to_le32(tmp - *pbuffer);
440 if (ses->user_name != NULL) {
441 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
442 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
443 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
444
445 sec_blob->NtChallengeResponse.Length =
446 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
447 sec_blob->NtChallengeResponse.MaximumLength =
448 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
449 } else {
450 /*
451 * don't send an NT Response for anonymous access
452 */
453 sec_blob->NtChallengeResponse.Length = 0;
454 sec_blob->NtChallengeResponse.MaximumLength = 0;
455 }
456
457 if (ses->domainName == NULL) {
458 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
459 sec_blob->DomainName.Length = 0;
460 sec_blob->DomainName.MaximumLength = 0;
461 tmp += 2;
462 } else {
463 int len;
464 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
465 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
466 len *= 2; /* unicode is 2 bytes each */
467 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
468 sec_blob->DomainName.Length = cpu_to_le16(len);
469 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
470 tmp += len;
471 }
472
473 if (ses->user_name == NULL) {
474 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
475 sec_blob->UserName.Length = 0;
476 sec_blob->UserName.MaximumLength = 0;
477 tmp += 2;
478 } else {
479 int len;
480 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
481 CIFS_MAX_USERNAME_LEN, nls_cp);
482 len *= 2; /* unicode is 2 bytes each */
483 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
484 sec_blob->UserName.Length = cpu_to_le16(len);
485 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
486 tmp += len;
487 }
488
489 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
490 sec_blob->WorkstationName.Length = 0;
491 sec_blob->WorkstationName.MaximumLength = 0;
492 tmp += 2;
493
494 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
495 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
496 && !calc_seckey(ses)) {
497 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
498 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
499 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
500 sec_blob->SessionKey.MaximumLength =
501 cpu_to_le16(CIFS_CPHTXT_SIZE);
502 tmp += CIFS_CPHTXT_SIZE;
503 } else {
504 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
505 sec_blob->SessionKey.Length = 0;
506 sec_blob->SessionKey.MaximumLength = 0;
507 }
508
509 *buflen = tmp - *pbuffer;
510 setup_ntlmv2_ret:
511 return rc;
512 }
513
514 enum securityEnum
cifs_select_sectype(struct TCP_Server_Info * server,enum securityEnum requested)515 cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
516 {
517 switch (server->negflavor) {
518 case CIFS_NEGFLAVOR_EXTENDED:
519 switch (requested) {
520 case Kerberos:
521 case RawNTLMSSP:
522 return requested;
523 case Unspecified:
524 if (server->sec_ntlmssp &&
525 (global_secflags & CIFSSEC_MAY_NTLMSSP))
526 return RawNTLMSSP;
527 if ((server->sec_kerberos || server->sec_mskerberos) &&
528 (global_secflags & CIFSSEC_MAY_KRB5))
529 return Kerberos;
530 /* Fallthrough */
531 default:
532 return Unspecified;
533 }
534 case CIFS_NEGFLAVOR_UNENCAP:
535 switch (requested) {
536 case NTLM:
537 case NTLMv2:
538 return requested;
539 case Unspecified:
540 if (global_secflags & CIFSSEC_MAY_NTLMV2)
541 return NTLMv2;
542 if (global_secflags & CIFSSEC_MAY_NTLM)
543 return NTLM;
544 default:
545 break;
546 }
547 /* Fallthrough - to attempt LANMAN authentication next */
548 case CIFS_NEGFLAVOR_LANMAN:
549 switch (requested) {
550 case LANMAN:
551 return requested;
552 case Unspecified:
553 if (global_secflags & CIFSSEC_MAY_LANMAN)
554 return LANMAN;
555 /* Fallthrough */
556 default:
557 return Unspecified;
558 }
559 default:
560 return Unspecified;
561 }
562 }
563
564 struct sess_data {
565 unsigned int xid;
566 struct cifs_ses *ses;
567 struct nls_table *nls_cp;
568 void (*func)(struct sess_data *);
569 int result;
570
571 /* we will send the SMB in three pieces:
572 * a fixed length beginning part, an optional
573 * SPNEGO blob (which can be zero length), and a
574 * last part which will include the strings
575 * and rest of bcc area. This allows us to avoid
576 * a large buffer 17K allocation
577 */
578 int buf0_type;
579 struct kvec iov[3];
580 };
581
582 static int
sess_alloc_buffer(struct sess_data * sess_data,int wct)583 sess_alloc_buffer(struct sess_data *sess_data, int wct)
584 {
585 int rc;
586 struct cifs_ses *ses = sess_data->ses;
587 struct smb_hdr *smb_buf;
588
589 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
590 (void **)&smb_buf);
591
592 if (rc)
593 return rc;
594
595 sess_data->iov[0].iov_base = (char *)smb_buf;
596 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
597 /*
598 * This variable will be used to clear the buffer
599 * allocated above in case of any error in the calling function.
600 */
601 sess_data->buf0_type = CIFS_SMALL_BUFFER;
602
603 /* 2000 big enough to fit max user, domain, NOS name etc. */
604 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
605 if (!sess_data->iov[2].iov_base) {
606 rc = -ENOMEM;
607 goto out_free_smb_buf;
608 }
609
610 return 0;
611
612 out_free_smb_buf:
613 kfree(smb_buf);
614 sess_data->iov[0].iov_base = NULL;
615 sess_data->iov[0].iov_len = 0;
616 sess_data->buf0_type = CIFS_NO_BUFFER;
617 return rc;
618 }
619
620 static void
sess_free_buffer(struct sess_data * sess_data)621 sess_free_buffer(struct sess_data *sess_data)
622 {
623
624 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
625 sess_data->buf0_type = CIFS_NO_BUFFER;
626 kfree(sess_data->iov[2].iov_base);
627 }
628
629 static int
sess_establish_session(struct sess_data * sess_data)630 sess_establish_session(struct sess_data *sess_data)
631 {
632 struct cifs_ses *ses = sess_data->ses;
633
634 mutex_lock(&ses->server->srv_mutex);
635 if (!ses->server->session_estab) {
636 if (ses->server->sign) {
637 ses->server->session_key.response =
638 kmemdup(ses->auth_key.response,
639 ses->auth_key.len, GFP_KERNEL);
640 if (!ses->server->session_key.response) {
641 mutex_unlock(&ses->server->srv_mutex);
642 return -ENOMEM;
643 }
644 ses->server->session_key.len =
645 ses->auth_key.len;
646 }
647 ses->server->sequence_number = 0x2;
648 ses->server->session_estab = true;
649 }
650 mutex_unlock(&ses->server->srv_mutex);
651
652 cifs_dbg(FYI, "CIFS session established successfully\n");
653 spin_lock(&GlobalMid_Lock);
654 ses->status = CifsGood;
655 ses->need_reconnect = false;
656 spin_unlock(&GlobalMid_Lock);
657
658 return 0;
659 }
660
661 static int
sess_sendreceive(struct sess_data * sess_data)662 sess_sendreceive(struct sess_data *sess_data)
663 {
664 int rc;
665 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
666 __u16 count;
667 struct kvec rsp_iov = { NULL, 0 };
668
669 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
670 smb_buf->smb_buf_length =
671 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
672 put_bcc(count, smb_buf);
673
674 rc = SendReceive2(sess_data->xid, sess_data->ses,
675 sess_data->iov, 3 /* num_iovecs */,
676 &sess_data->buf0_type,
677 CIFS_LOG_ERROR, &rsp_iov);
678 cifs_small_buf_release(sess_data->iov[0].iov_base);
679 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
680
681 return rc;
682 }
683
684 /*
685 * LANMAN and plaintext are less secure and off by default.
686 * So we make this explicitly be turned on in kconfig (in the
687 * build) and turned on at runtime (changed from the default)
688 * in proc/fs/cifs or via mount parm. Unfortunately this is
689 * needed for old Win (e.g. Win95), some obscure NAS and OS/2
690 */
691 #ifdef CONFIG_CIFS_WEAK_PW_HASH
692 static void
sess_auth_lanman(struct sess_data * sess_data)693 sess_auth_lanman(struct sess_data *sess_data)
694 {
695 int rc = 0;
696 struct smb_hdr *smb_buf;
697 SESSION_SETUP_ANDX *pSMB;
698 char *bcc_ptr;
699 struct cifs_ses *ses = sess_data->ses;
700 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
701 __u16 bytes_remaining;
702
703 /* lanman 2 style sessionsetup */
704 /* wct = 10 */
705 rc = sess_alloc_buffer(sess_data, 10);
706 if (rc)
707 goto out;
708
709 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
710 bcc_ptr = sess_data->iov[2].iov_base;
711 (void)cifs_ssetup_hdr(ses, pSMB);
712
713 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
714
715 if (ses->user_name != NULL) {
716 /* no capabilities flags in old lanman negotiation */
717 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
718
719 /* Calculate hash with password and copy into bcc_ptr.
720 * Encryption Key (stored as in cryptkey) gets used if the
721 * security mode bit in Negottiate Protocol response states
722 * to use challenge/response method (i.e. Password bit is 1).
723 */
724 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
725 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
726 true : false, lnm_session_key);
727 if (rc)
728 goto out;
729
730 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
731 bcc_ptr += CIFS_AUTH_RESP_SIZE;
732 } else {
733 pSMB->old_req.PasswordLength = 0;
734 }
735
736 /*
737 * can not sign if LANMAN negotiated so no need
738 * to calculate signing key? but what if server
739 * changed to do higher than lanman dialect and
740 * we reconnected would we ever calc signing_key?
741 */
742
743 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
744 /* Unicode not allowed for LANMAN dialects */
745 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
746
747 sess_data->iov[2].iov_len = (long) bcc_ptr -
748 (long) sess_data->iov[2].iov_base;
749
750 rc = sess_sendreceive(sess_data);
751 if (rc)
752 goto out;
753
754 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
755 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
756
757 /* lanman response has a word count of 3 */
758 if (smb_buf->WordCount != 3) {
759 rc = -EIO;
760 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
761 goto out;
762 }
763
764 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
765 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
766
767 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
768 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
769
770 bytes_remaining = get_bcc(smb_buf);
771 bcc_ptr = pByteArea(smb_buf);
772
773 /* BB check if Unicode and decode strings */
774 if (bytes_remaining == 0) {
775 /* no string area to decode, do nothing */
776 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
777 /* unicode string area must be word-aligned */
778 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
779 ++bcc_ptr;
780 --bytes_remaining;
781 }
782 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
783 sess_data->nls_cp);
784 } else {
785 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
786 sess_data->nls_cp);
787 }
788
789 rc = sess_establish_session(sess_data);
790 out:
791 sess_data->result = rc;
792 sess_data->func = NULL;
793 sess_free_buffer(sess_data);
794 }
795
796 #endif
797
798 static void
sess_auth_ntlm(struct sess_data * sess_data)799 sess_auth_ntlm(struct sess_data *sess_data)
800 {
801 int rc = 0;
802 struct smb_hdr *smb_buf;
803 SESSION_SETUP_ANDX *pSMB;
804 char *bcc_ptr;
805 struct cifs_ses *ses = sess_data->ses;
806 __u32 capabilities;
807 __u16 bytes_remaining;
808
809 /* old style NTLM sessionsetup */
810 /* wct = 13 */
811 rc = sess_alloc_buffer(sess_data, 13);
812 if (rc)
813 goto out;
814
815 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
816 bcc_ptr = sess_data->iov[2].iov_base;
817 capabilities = cifs_ssetup_hdr(ses, pSMB);
818
819 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
820 if (ses->user_name != NULL) {
821 pSMB->req_no_secext.CaseInsensitivePasswordLength =
822 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
823 pSMB->req_no_secext.CaseSensitivePasswordLength =
824 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
825
826 /* calculate ntlm response and session key */
827 rc = setup_ntlm_response(ses, sess_data->nls_cp);
828 if (rc) {
829 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
830 rc);
831 goto out;
832 }
833
834 /* copy ntlm response */
835 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
836 CIFS_AUTH_RESP_SIZE);
837 bcc_ptr += CIFS_AUTH_RESP_SIZE;
838 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
839 CIFS_AUTH_RESP_SIZE);
840 bcc_ptr += CIFS_AUTH_RESP_SIZE;
841 } else {
842 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
843 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
844 }
845
846 if (ses->capabilities & CAP_UNICODE) {
847 /* unicode strings must be word aligned */
848 if (sess_data->iov[0].iov_len % 2) {
849 *bcc_ptr = 0;
850 bcc_ptr++;
851 }
852 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
853 } else {
854 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
855 }
856
857
858 sess_data->iov[2].iov_len = (long) bcc_ptr -
859 (long) sess_data->iov[2].iov_base;
860
861 rc = sess_sendreceive(sess_data);
862 if (rc)
863 goto out;
864
865 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
866 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
867
868 if (smb_buf->WordCount != 3) {
869 rc = -EIO;
870 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
871 goto out;
872 }
873
874 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
875 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
876
877 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
878 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
879
880 bytes_remaining = get_bcc(smb_buf);
881 bcc_ptr = pByteArea(smb_buf);
882
883 /* BB check if Unicode and decode strings */
884 if (bytes_remaining == 0) {
885 /* no string area to decode, do nothing */
886 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
887 /* unicode string area must be word-aligned */
888 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
889 ++bcc_ptr;
890 --bytes_remaining;
891 }
892 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
893 sess_data->nls_cp);
894 } else {
895 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
896 sess_data->nls_cp);
897 }
898
899 rc = sess_establish_session(sess_data);
900 out:
901 sess_data->result = rc;
902 sess_data->func = NULL;
903 sess_free_buffer(sess_data);
904 kfree(ses->auth_key.response);
905 ses->auth_key.response = NULL;
906 }
907
908 static void
sess_auth_ntlmv2(struct sess_data * sess_data)909 sess_auth_ntlmv2(struct sess_data *sess_data)
910 {
911 int rc = 0;
912 struct smb_hdr *smb_buf;
913 SESSION_SETUP_ANDX *pSMB;
914 char *bcc_ptr;
915 struct cifs_ses *ses = sess_data->ses;
916 __u32 capabilities;
917 __u16 bytes_remaining;
918
919 /* old style NTLM sessionsetup */
920 /* wct = 13 */
921 rc = sess_alloc_buffer(sess_data, 13);
922 if (rc)
923 goto out;
924
925 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
926 bcc_ptr = sess_data->iov[2].iov_base;
927 capabilities = cifs_ssetup_hdr(ses, pSMB);
928
929 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
930
931 /* LM2 password would be here if we supported it */
932 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
933
934 if (ses->user_name != NULL) {
935 /* calculate nlmv2 response and session key */
936 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
937 if (rc) {
938 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
939 goto out;
940 }
941
942 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
943 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
944 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
945
946 /* set case sensitive password length after tilen may get
947 * assigned, tilen is 0 otherwise.
948 */
949 pSMB->req_no_secext.CaseSensitivePasswordLength =
950 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
951 } else {
952 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
953 }
954
955 if (ses->capabilities & CAP_UNICODE) {
956 if (sess_data->iov[0].iov_len % 2) {
957 *bcc_ptr = 0;
958 bcc_ptr++;
959 }
960 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
961 } else {
962 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
963 }
964
965
966 sess_data->iov[2].iov_len = (long) bcc_ptr -
967 (long) sess_data->iov[2].iov_base;
968
969 rc = sess_sendreceive(sess_data);
970 if (rc)
971 goto out;
972
973 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
974 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
975
976 if (smb_buf->WordCount != 3) {
977 rc = -EIO;
978 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
979 goto out;
980 }
981
982 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
983 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
984
985 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
986 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
987
988 bytes_remaining = get_bcc(smb_buf);
989 bcc_ptr = pByteArea(smb_buf);
990
991 /* BB check if Unicode and decode strings */
992 if (bytes_remaining == 0) {
993 /* no string area to decode, do nothing */
994 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
995 /* unicode string area must be word-aligned */
996 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
997 ++bcc_ptr;
998 --bytes_remaining;
999 }
1000 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1001 sess_data->nls_cp);
1002 } else {
1003 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1004 sess_data->nls_cp);
1005 }
1006
1007 rc = sess_establish_session(sess_data);
1008 out:
1009 sess_data->result = rc;
1010 sess_data->func = NULL;
1011 sess_free_buffer(sess_data);
1012 kfree(ses->auth_key.response);
1013 ses->auth_key.response = NULL;
1014 }
1015
1016 #ifdef CONFIG_CIFS_UPCALL
1017 static void
sess_auth_kerberos(struct sess_data * sess_data)1018 sess_auth_kerberos(struct sess_data *sess_data)
1019 {
1020 int rc = 0;
1021 struct smb_hdr *smb_buf;
1022 SESSION_SETUP_ANDX *pSMB;
1023 char *bcc_ptr;
1024 struct cifs_ses *ses = sess_data->ses;
1025 __u32 capabilities;
1026 __u16 bytes_remaining;
1027 struct key *spnego_key = NULL;
1028 struct cifs_spnego_msg *msg;
1029 u16 blob_len;
1030
1031 /* extended security */
1032 /* wct = 12 */
1033 rc = sess_alloc_buffer(sess_data, 12);
1034 if (rc)
1035 goto out;
1036
1037 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1038 bcc_ptr = sess_data->iov[2].iov_base;
1039 capabilities = cifs_ssetup_hdr(ses, pSMB);
1040
1041 spnego_key = cifs_get_spnego_key(ses);
1042 if (IS_ERR(spnego_key)) {
1043 rc = PTR_ERR(spnego_key);
1044 spnego_key = NULL;
1045 goto out;
1046 }
1047
1048 msg = spnego_key->payload.data[0];
1049 /*
1050 * check version field to make sure that cifs.upcall is
1051 * sending us a response in an expected form
1052 */
1053 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1054 cifs_dbg(VFS,
1055 "incorrect version of cifs.upcall (expected %d but got %d)",
1056 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1057 rc = -EKEYREJECTED;
1058 goto out_put_spnego_key;
1059 }
1060
1061 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1062 GFP_KERNEL);
1063 if (!ses->auth_key.response) {
1064 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory",
1065 msg->sesskey_len);
1066 rc = -ENOMEM;
1067 goto out_put_spnego_key;
1068 }
1069 ses->auth_key.len = msg->sesskey_len;
1070
1071 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1072 capabilities |= CAP_EXTENDED_SECURITY;
1073 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1074 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1075 sess_data->iov[1].iov_len = msg->secblob_len;
1076 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1077
1078 if (ses->capabilities & CAP_UNICODE) {
1079 /* unicode strings must be word aligned */
1080 if ((sess_data->iov[0].iov_len
1081 + sess_data->iov[1].iov_len) % 2) {
1082 *bcc_ptr = 0;
1083 bcc_ptr++;
1084 }
1085 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1086 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1087 } else {
1088 /* BB: is this right? */
1089 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1090 }
1091
1092 sess_data->iov[2].iov_len = (long) bcc_ptr -
1093 (long) sess_data->iov[2].iov_base;
1094
1095 rc = sess_sendreceive(sess_data);
1096 if (rc)
1097 goto out_put_spnego_key;
1098
1099 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1100 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1101
1102 if (smb_buf->WordCount != 4) {
1103 rc = -EIO;
1104 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1105 goto out_put_spnego_key;
1106 }
1107
1108 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1109 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1110
1111 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1112 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1113
1114 bytes_remaining = get_bcc(smb_buf);
1115 bcc_ptr = pByteArea(smb_buf);
1116
1117 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1118 if (blob_len > bytes_remaining) {
1119 cifs_dbg(VFS, "bad security blob length %d\n",
1120 blob_len);
1121 rc = -EINVAL;
1122 goto out_put_spnego_key;
1123 }
1124 bcc_ptr += blob_len;
1125 bytes_remaining -= blob_len;
1126
1127 /* BB check if Unicode and decode strings */
1128 if (bytes_remaining == 0) {
1129 /* no string area to decode, do nothing */
1130 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1131 /* unicode string area must be word-aligned */
1132 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1133 ++bcc_ptr;
1134 --bytes_remaining;
1135 }
1136 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1137 sess_data->nls_cp);
1138 } else {
1139 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1140 sess_data->nls_cp);
1141 }
1142
1143 rc = sess_establish_session(sess_data);
1144 out_put_spnego_key:
1145 key_invalidate(spnego_key);
1146 key_put(spnego_key);
1147 out:
1148 sess_data->result = rc;
1149 sess_data->func = NULL;
1150 sess_free_buffer(sess_data);
1151 kfree(ses->auth_key.response);
1152 ses->auth_key.response = NULL;
1153 }
1154
1155 #endif /* ! CONFIG_CIFS_UPCALL */
1156
1157 /*
1158 * The required kvec buffers have to be allocated before calling this
1159 * function.
1160 */
1161 static int
_sess_auth_rawntlmssp_assemble_req(struct sess_data * sess_data)1162 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1163 {
1164 SESSION_SETUP_ANDX *pSMB;
1165 struct cifs_ses *ses = sess_data->ses;
1166 __u32 capabilities;
1167 char *bcc_ptr;
1168
1169 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1170
1171 capabilities = cifs_ssetup_hdr(ses, pSMB);
1172 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1173 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1174 return -ENOSYS;
1175 }
1176
1177 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1178 capabilities |= CAP_EXTENDED_SECURITY;
1179 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1180
1181 bcc_ptr = sess_data->iov[2].iov_base;
1182 /* unicode strings must be word aligned */
1183 if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1184 *bcc_ptr = 0;
1185 bcc_ptr++;
1186 }
1187 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1188
1189 sess_data->iov[2].iov_len = (long) bcc_ptr -
1190 (long) sess_data->iov[2].iov_base;
1191
1192 return 0;
1193 }
1194
1195 static void
1196 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1197
1198 static void
sess_auth_rawntlmssp_negotiate(struct sess_data * sess_data)1199 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1200 {
1201 int rc;
1202 struct smb_hdr *smb_buf;
1203 SESSION_SETUP_ANDX *pSMB;
1204 struct cifs_ses *ses = sess_data->ses;
1205 __u16 bytes_remaining;
1206 char *bcc_ptr;
1207 u16 blob_len;
1208
1209 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1210
1211 /*
1212 * if memory allocation is successful, caller of this function
1213 * frees it.
1214 */
1215 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1216 if (!ses->ntlmssp) {
1217 rc = -ENOMEM;
1218 goto out;
1219 }
1220 ses->ntlmssp->sesskey_per_smbsess = false;
1221
1222 /* wct = 12 */
1223 rc = sess_alloc_buffer(sess_data, 12);
1224 if (rc)
1225 goto out;
1226
1227 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1228
1229 /* Build security blob before we assemble the request */
1230 build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
1231 sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
1232 sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
1233 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
1234
1235 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1236 if (rc)
1237 goto out;
1238
1239 rc = sess_sendreceive(sess_data);
1240
1241 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1242 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1243
1244 /* If true, rc here is expected and not an error */
1245 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1246 smb_buf->Status.CifsError ==
1247 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1248 rc = 0;
1249
1250 if (rc)
1251 goto out;
1252
1253 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1254
1255 if (smb_buf->WordCount != 4) {
1256 rc = -EIO;
1257 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1258 goto out;
1259 }
1260
1261 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1262 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1263
1264 bytes_remaining = get_bcc(smb_buf);
1265 bcc_ptr = pByteArea(smb_buf);
1266
1267 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1268 if (blob_len > bytes_remaining) {
1269 cifs_dbg(VFS, "bad security blob length %d\n",
1270 blob_len);
1271 rc = -EINVAL;
1272 goto out;
1273 }
1274
1275 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1276 out:
1277 sess_free_buffer(sess_data);
1278
1279 if (!rc) {
1280 sess_data->func = sess_auth_rawntlmssp_authenticate;
1281 return;
1282 }
1283
1284 /* Else error. Cleanup */
1285 kfree(ses->auth_key.response);
1286 ses->auth_key.response = NULL;
1287 kfree(ses->ntlmssp);
1288 ses->ntlmssp = NULL;
1289
1290 sess_data->func = NULL;
1291 sess_data->result = rc;
1292 }
1293
1294 static void
sess_auth_rawntlmssp_authenticate(struct sess_data * sess_data)1295 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1296 {
1297 int rc;
1298 struct smb_hdr *smb_buf;
1299 SESSION_SETUP_ANDX *pSMB;
1300 struct cifs_ses *ses = sess_data->ses;
1301 __u16 bytes_remaining;
1302 char *bcc_ptr;
1303 unsigned char *ntlmsspblob = NULL;
1304 u16 blob_len;
1305
1306 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1307
1308 /* wct = 12 */
1309 rc = sess_alloc_buffer(sess_data, 12);
1310 if (rc)
1311 goto out;
1312
1313 /* Build security blob before we assemble the request */
1314 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1315 smb_buf = (struct smb_hdr *)pSMB;
1316 rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1317 &blob_len, ses, sess_data->nls_cp);
1318 if (rc)
1319 goto out_free_ntlmsspblob;
1320 sess_data->iov[1].iov_len = blob_len;
1321 sess_data->iov[1].iov_base = ntlmsspblob;
1322 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1323 /*
1324 * Make sure that we tell the server that we are using
1325 * the uid that it just gave us back on the response
1326 * (challenge)
1327 */
1328 smb_buf->Uid = ses->Suid;
1329
1330 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1331 if (rc)
1332 goto out_free_ntlmsspblob;
1333
1334 rc = sess_sendreceive(sess_data);
1335 if (rc)
1336 goto out_free_ntlmsspblob;
1337
1338 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1339 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1340 if (smb_buf->WordCount != 4) {
1341 rc = -EIO;
1342 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1343 goto out_free_ntlmsspblob;
1344 }
1345
1346 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1347 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1348
1349 if (ses->Suid != smb_buf->Uid) {
1350 ses->Suid = smb_buf->Uid;
1351 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1352 }
1353
1354 bytes_remaining = get_bcc(smb_buf);
1355 bcc_ptr = pByteArea(smb_buf);
1356 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1357 if (blob_len > bytes_remaining) {
1358 cifs_dbg(VFS, "bad security blob length %d\n",
1359 blob_len);
1360 rc = -EINVAL;
1361 goto out_free_ntlmsspblob;
1362 }
1363 bcc_ptr += blob_len;
1364 bytes_remaining -= blob_len;
1365
1366
1367 /* BB check if Unicode and decode strings */
1368 if (bytes_remaining == 0) {
1369 /* no string area to decode, do nothing */
1370 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1371 /* unicode string area must be word-aligned */
1372 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1373 ++bcc_ptr;
1374 --bytes_remaining;
1375 }
1376 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1377 sess_data->nls_cp);
1378 } else {
1379 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1380 sess_data->nls_cp);
1381 }
1382
1383 out_free_ntlmsspblob:
1384 kfree(ntlmsspblob);
1385 out:
1386 sess_free_buffer(sess_data);
1387
1388 if (!rc)
1389 rc = sess_establish_session(sess_data);
1390
1391 /* Cleanup */
1392 kfree(ses->auth_key.response);
1393 ses->auth_key.response = NULL;
1394 kfree(ses->ntlmssp);
1395 ses->ntlmssp = NULL;
1396
1397 sess_data->func = NULL;
1398 sess_data->result = rc;
1399 }
1400
select_sec(struct cifs_ses * ses,struct sess_data * sess_data)1401 static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
1402 {
1403 int type;
1404
1405 type = cifs_select_sectype(ses->server, ses->sectype);
1406 cifs_dbg(FYI, "sess setup type %d\n", type);
1407 if (type == Unspecified) {
1408 cifs_dbg(VFS,
1409 "Unable to select appropriate authentication method!");
1410 return -EINVAL;
1411 }
1412
1413 switch (type) {
1414 case LANMAN:
1415 /* LANMAN and plaintext are less secure and off by default.
1416 * So we make this explicitly be turned on in kconfig (in the
1417 * build) and turned on at runtime (changed from the default)
1418 * in proc/fs/cifs or via mount parm. Unfortunately this is
1419 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
1420 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1421 sess_data->func = sess_auth_lanman;
1422 break;
1423 #else
1424 return -EOPNOTSUPP;
1425 #endif
1426 case NTLM:
1427 sess_data->func = sess_auth_ntlm;
1428 break;
1429 case NTLMv2:
1430 sess_data->func = sess_auth_ntlmv2;
1431 break;
1432 case Kerberos:
1433 #ifdef CONFIG_CIFS_UPCALL
1434 sess_data->func = sess_auth_kerberos;
1435 break;
1436 #else
1437 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1438 return -ENOSYS;
1439 break;
1440 #endif /* CONFIG_CIFS_UPCALL */
1441 case RawNTLMSSP:
1442 sess_data->func = sess_auth_rawntlmssp_negotiate;
1443 break;
1444 default:
1445 cifs_dbg(VFS, "secType %d not supported!\n", type);
1446 return -ENOSYS;
1447 }
1448
1449 return 0;
1450 }
1451
CIFS_SessSetup(const unsigned int xid,struct cifs_ses * ses,const struct nls_table * nls_cp)1452 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1453 const struct nls_table *nls_cp)
1454 {
1455 int rc = 0;
1456 struct sess_data *sess_data;
1457
1458 if (ses == NULL) {
1459 WARN(1, "%s: ses == NULL!", __func__);
1460 return -EINVAL;
1461 }
1462
1463 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1464 if (!sess_data)
1465 return -ENOMEM;
1466
1467 rc = select_sec(ses, sess_data);
1468 if (rc)
1469 goto out;
1470
1471 sess_data->xid = xid;
1472 sess_data->ses = ses;
1473 sess_data->buf0_type = CIFS_NO_BUFFER;
1474 sess_data->nls_cp = (struct nls_table *) nls_cp;
1475
1476 while (sess_data->func)
1477 sess_data->func(sess_data);
1478
1479 /* Store result before we free sess_data */
1480 rc = sess_data->result;
1481
1482 out:
1483 kfree(sess_data);
1484 return rc;
1485 }
1486
