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 if (ses->server->sign) {
349 flags |= NTLMSSP_NEGOTIATE_SIGN;
350 if (!ses->server->session_estab ||
351 ses->ntlmssp->sesskey_per_smbsess)
352 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
353 }
354
355 sec_blob->NegotiateFlags = cpu_to_le32(flags);
356
357 sec_blob->WorkstationName.BufferOffset = 0;
358 sec_blob->WorkstationName.Length = 0;
359 sec_blob->WorkstationName.MaximumLength = 0;
360
361 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
362 sec_blob->DomainName.BufferOffset = 0;
363 sec_blob->DomainName.Length = 0;
364 sec_blob->DomainName.MaximumLength = 0;
365 }
366
367 /* We do not malloc the blob, it is passed in pbuffer, because its
368 maximum possible size is fixed and small, making this approach cleaner.
369 This function returns the length of the data in the blob */
build_ntlmssp_auth_blob(unsigned char * pbuffer,u16 * buflen,struct cifs_ses * ses,const struct nls_table * nls_cp)370 int build_ntlmssp_auth_blob(unsigned char *pbuffer,
371 u16 *buflen,
372 struct cifs_ses *ses,
373 const struct nls_table *nls_cp)
374 {
375 int rc;
376 AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer;
377 __u32 flags;
378 unsigned char *tmp;
379
380 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
381 sec_blob->MessageType = NtLmAuthenticate;
382
383 flags = NTLMSSP_NEGOTIATE_56 |
384 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
385 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
386 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
387 if (ses->server->sign) {
388 flags |= NTLMSSP_NEGOTIATE_SIGN;
389 if (!ses->server->session_estab ||
390 ses->ntlmssp->sesskey_per_smbsess)
391 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
392 }
393
394 tmp = pbuffer + sizeof(AUTHENTICATE_MESSAGE);
395 sec_blob->NegotiateFlags = cpu_to_le32(flags);
396
397 sec_blob->LmChallengeResponse.BufferOffset =
398 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
399 sec_blob->LmChallengeResponse.Length = 0;
400 sec_blob->LmChallengeResponse.MaximumLength = 0;
401
402 sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer);
403 if (ses->user_name != NULL) {
404 rc = setup_ntlmv2_rsp(ses, nls_cp);
405 if (rc) {
406 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
407 goto setup_ntlmv2_ret;
408 }
409 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
410 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
411 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
412
413 sec_blob->NtChallengeResponse.Length =
414 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
415 sec_blob->NtChallengeResponse.MaximumLength =
416 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
417 } else {
418 /*
419 * don't send an NT Response for anonymous access
420 */
421 sec_blob->NtChallengeResponse.Length = 0;
422 sec_blob->NtChallengeResponse.MaximumLength = 0;
423 }
424
425 if (ses->domainName == NULL) {
426 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
427 sec_blob->DomainName.Length = 0;
428 sec_blob->DomainName.MaximumLength = 0;
429 tmp += 2;
430 } else {
431 int len;
432 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
433 CIFS_MAX_USERNAME_LEN, nls_cp);
434 len *= 2; /* unicode is 2 bytes each */
435 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
436 sec_blob->DomainName.Length = cpu_to_le16(len);
437 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
438 tmp += len;
439 }
440
441 if (ses->user_name == NULL) {
442 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
443 sec_blob->UserName.Length = 0;
444 sec_blob->UserName.MaximumLength = 0;
445 tmp += 2;
446 } else {
447 int len;
448 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
449 CIFS_MAX_USERNAME_LEN, nls_cp);
450 len *= 2; /* unicode is 2 bytes each */
451 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
452 sec_blob->UserName.Length = cpu_to_le16(len);
453 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
454 tmp += len;
455 }
456
457 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - pbuffer);
458 sec_blob->WorkstationName.Length = 0;
459 sec_blob->WorkstationName.MaximumLength = 0;
460 tmp += 2;
461
462 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
463 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
464 && !calc_seckey(ses)) {
465 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
466 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
467 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
468 sec_blob->SessionKey.MaximumLength =
469 cpu_to_le16(CIFS_CPHTXT_SIZE);
470 tmp += CIFS_CPHTXT_SIZE;
471 } else {
472 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
473 sec_blob->SessionKey.Length = 0;
474 sec_blob->SessionKey.MaximumLength = 0;
475 }
476
477 setup_ntlmv2_ret:
478 *buflen = tmp - pbuffer;
479 return rc;
480 }
481
482 enum securityEnum
select_sectype(struct TCP_Server_Info * server,enum securityEnum requested)483 select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
484 {
485 switch (server->negflavor) {
486 case CIFS_NEGFLAVOR_EXTENDED:
487 switch (requested) {
488 case Kerberos:
489 case RawNTLMSSP:
490 return requested;
491 case Unspecified:
492 if (server->sec_ntlmssp &&
493 (global_secflags & CIFSSEC_MAY_NTLMSSP))
494 return RawNTLMSSP;
495 if ((server->sec_kerberos || server->sec_mskerberos) &&
496 (global_secflags & CIFSSEC_MAY_KRB5))
497 return Kerberos;
498 /* Fallthrough */
499 default:
500 return Unspecified;
501 }
502 case CIFS_NEGFLAVOR_UNENCAP:
503 switch (requested) {
504 case NTLM:
505 case NTLMv2:
506 return requested;
507 case Unspecified:
508 if (global_secflags & CIFSSEC_MAY_NTLMV2)
509 return NTLMv2;
510 if (global_secflags & CIFSSEC_MAY_NTLM)
511 return NTLM;
512 default:
513 /* Fallthrough to attempt LANMAN authentication next */
514 break;
515 }
516 case CIFS_NEGFLAVOR_LANMAN:
517 switch (requested) {
518 case LANMAN:
519 return requested;
520 case Unspecified:
521 if (global_secflags & CIFSSEC_MAY_LANMAN)
522 return LANMAN;
523 /* Fallthrough */
524 default:
525 return Unspecified;
526 }
527 default:
528 return Unspecified;
529 }
530 }
531
532 struct sess_data {
533 unsigned int xid;
534 struct cifs_ses *ses;
535 struct nls_table *nls_cp;
536 void (*func)(struct sess_data *);
537 int result;
538
539 /* we will send the SMB in three pieces:
540 * a fixed length beginning part, an optional
541 * SPNEGO blob (which can be zero length), and a
542 * last part which will include the strings
543 * and rest of bcc area. This allows us to avoid
544 * a large buffer 17K allocation
545 */
546 int buf0_type;
547 struct kvec iov[3];
548 };
549
550 static int
sess_alloc_buffer(struct sess_data * sess_data,int wct)551 sess_alloc_buffer(struct sess_data *sess_data, int wct)
552 {
553 int rc;
554 struct cifs_ses *ses = sess_data->ses;
555 struct smb_hdr *smb_buf;
556
557 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
558 (void **)&smb_buf);
559
560 if (rc)
561 return rc;
562
563 sess_data->iov[0].iov_base = (char *)smb_buf;
564 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
565 /*
566 * This variable will be used to clear the buffer
567 * allocated above in case of any error in the calling function.
568 */
569 sess_data->buf0_type = CIFS_SMALL_BUFFER;
570
571 /* 2000 big enough to fit max user, domain, NOS name etc. */
572 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
573 if (!sess_data->iov[2].iov_base) {
574 rc = -ENOMEM;
575 goto out_free_smb_buf;
576 }
577
578 return 0;
579
580 out_free_smb_buf:
581 kfree(smb_buf);
582 sess_data->iov[0].iov_base = NULL;
583 sess_data->iov[0].iov_len = 0;
584 sess_data->buf0_type = CIFS_NO_BUFFER;
585 return rc;
586 }
587
588 static void
sess_free_buffer(struct sess_data * sess_data)589 sess_free_buffer(struct sess_data *sess_data)
590 {
591
592 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
593 sess_data->buf0_type = CIFS_NO_BUFFER;
594 kfree(sess_data->iov[2].iov_base);
595 }
596
597 static int
sess_establish_session(struct sess_data * sess_data)598 sess_establish_session(struct sess_data *sess_data)
599 {
600 struct cifs_ses *ses = sess_data->ses;
601
602 mutex_lock(&ses->server->srv_mutex);
603 if (!ses->server->session_estab) {
604 if (ses->server->sign) {
605 ses->server->session_key.response =
606 kmemdup(ses->auth_key.response,
607 ses->auth_key.len, GFP_KERNEL);
608 if (!ses->server->session_key.response) {
609 mutex_unlock(&ses->server->srv_mutex);
610 return -ENOMEM;
611 }
612 ses->server->session_key.len =
613 ses->auth_key.len;
614 }
615 ses->server->sequence_number = 0x2;
616 ses->server->session_estab = true;
617 }
618 mutex_unlock(&ses->server->srv_mutex);
619
620 cifs_dbg(FYI, "CIFS session established successfully\n");
621 spin_lock(&GlobalMid_Lock);
622 ses->status = CifsGood;
623 ses->need_reconnect = false;
624 spin_unlock(&GlobalMid_Lock);
625
626 return 0;
627 }
628
629 static int
sess_sendreceive(struct sess_data * sess_data)630 sess_sendreceive(struct sess_data *sess_data)
631 {
632 int rc;
633 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
634 __u16 count;
635
636 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
637 smb_buf->smb_buf_length =
638 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
639 put_bcc(count, smb_buf);
640
641 rc = SendReceive2(sess_data->xid, sess_data->ses,
642 sess_data->iov, 3 /* num_iovecs */,
643 &sess_data->buf0_type,
644 CIFS_LOG_ERROR);
645
646 return rc;
647 }
648
649 /*
650 * LANMAN and plaintext are less secure and off by default.
651 * So we make this explicitly be turned on in kconfig (in the
652 * build) and turned on at runtime (changed from the default)
653 * in proc/fs/cifs or via mount parm. Unfortunately this is
654 * needed for old Win (e.g. Win95), some obscure NAS and OS/2
655 */
656 #ifdef CONFIG_CIFS_WEAK_PW_HASH
657 static void
sess_auth_lanman(struct sess_data * sess_data)658 sess_auth_lanman(struct sess_data *sess_data)
659 {
660 int rc = 0;
661 struct smb_hdr *smb_buf;
662 SESSION_SETUP_ANDX *pSMB;
663 char *bcc_ptr;
664 struct cifs_ses *ses = sess_data->ses;
665 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
666 __u32 capabilities;
667 __u16 bytes_remaining;
668
669 /* lanman 2 style sessionsetup */
670 /* wct = 10 */
671 rc = sess_alloc_buffer(sess_data, 10);
672 if (rc)
673 goto out;
674
675 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
676 bcc_ptr = sess_data->iov[2].iov_base;
677 capabilities = cifs_ssetup_hdr(ses, pSMB);
678
679 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
680
681 if (ses->user_name != NULL) {
682 /* no capabilities flags in old lanman negotiation */
683 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
684
685 /* Calculate hash with password and copy into bcc_ptr.
686 * Encryption Key (stored as in cryptkey) gets used if the
687 * security mode bit in Negottiate Protocol response states
688 * to use challenge/response method (i.e. Password bit is 1).
689 */
690 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
691 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
692 true : false, lnm_session_key);
693
694 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
695 bcc_ptr += CIFS_AUTH_RESP_SIZE;
696 } else {
697 pSMB->old_req.PasswordLength = 0;
698 }
699
700 /*
701 * can not sign if LANMAN negotiated so no need
702 * to calculate signing key? but what if server
703 * changed to do higher than lanman dialect and
704 * we reconnected would we ever calc signing_key?
705 */
706
707 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
708 /* Unicode not allowed for LANMAN dialects */
709 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
710
711 sess_data->iov[2].iov_len = (long) bcc_ptr -
712 (long) sess_data->iov[2].iov_base;
713
714 rc = sess_sendreceive(sess_data);
715 if (rc)
716 goto out;
717
718 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
719 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
720
721 /* lanman response has a word count of 3 */
722 if (smb_buf->WordCount != 3) {
723 rc = -EIO;
724 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
725 goto out;
726 }
727
728 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
729 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
730
731 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
732 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
733
734 bytes_remaining = get_bcc(smb_buf);
735 bcc_ptr = pByteArea(smb_buf);
736
737 /* BB check if Unicode and decode strings */
738 if (bytes_remaining == 0) {
739 /* no string area to decode, do nothing */
740 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
741 /* unicode string area must be word-aligned */
742 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
743 ++bcc_ptr;
744 --bytes_remaining;
745 }
746 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
747 sess_data->nls_cp);
748 } else {
749 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
750 sess_data->nls_cp);
751 }
752
753 rc = sess_establish_session(sess_data);
754 out:
755 sess_data->result = rc;
756 sess_data->func = NULL;
757 sess_free_buffer(sess_data);
758 }
759
760 #endif
761
762 static void
sess_auth_ntlm(struct sess_data * sess_data)763 sess_auth_ntlm(struct sess_data *sess_data)
764 {
765 int rc = 0;
766 struct smb_hdr *smb_buf;
767 SESSION_SETUP_ANDX *pSMB;
768 char *bcc_ptr;
769 struct cifs_ses *ses = sess_data->ses;
770 __u32 capabilities;
771 __u16 bytes_remaining;
772
773 /* old style NTLM sessionsetup */
774 /* wct = 13 */
775 rc = sess_alloc_buffer(sess_data, 13);
776 if (rc)
777 goto out;
778
779 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
780 bcc_ptr = sess_data->iov[2].iov_base;
781 capabilities = cifs_ssetup_hdr(ses, pSMB);
782
783 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
784 if (ses->user_name != NULL) {
785 pSMB->req_no_secext.CaseInsensitivePasswordLength =
786 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
787 pSMB->req_no_secext.CaseSensitivePasswordLength =
788 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
789
790 /* calculate ntlm response and session key */
791 rc = setup_ntlm_response(ses, sess_data->nls_cp);
792 if (rc) {
793 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
794 rc);
795 goto out;
796 }
797
798 /* copy ntlm response */
799 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
800 CIFS_AUTH_RESP_SIZE);
801 bcc_ptr += CIFS_AUTH_RESP_SIZE;
802 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
803 CIFS_AUTH_RESP_SIZE);
804 bcc_ptr += CIFS_AUTH_RESP_SIZE;
805 } else {
806 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
807 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
808 }
809
810 if (ses->capabilities & CAP_UNICODE) {
811 /* unicode strings must be word aligned */
812 if (sess_data->iov[0].iov_len % 2) {
813 *bcc_ptr = 0;
814 bcc_ptr++;
815 }
816 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
817 } else {
818 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
819 }
820
821
822 sess_data->iov[2].iov_len = (long) bcc_ptr -
823 (long) sess_data->iov[2].iov_base;
824
825 rc = sess_sendreceive(sess_data);
826 if (rc)
827 goto out;
828
829 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
830 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
831
832 if (smb_buf->WordCount != 3) {
833 rc = -EIO;
834 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
835 goto out;
836 }
837
838 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
839 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
840
841 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
842 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
843
844 bytes_remaining = get_bcc(smb_buf);
845 bcc_ptr = pByteArea(smb_buf);
846
847 /* BB check if Unicode and decode strings */
848 if (bytes_remaining == 0) {
849 /* no string area to decode, do nothing */
850 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
851 /* unicode string area must be word-aligned */
852 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
853 ++bcc_ptr;
854 --bytes_remaining;
855 }
856 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
857 sess_data->nls_cp);
858 } else {
859 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
860 sess_data->nls_cp);
861 }
862
863 rc = sess_establish_session(sess_data);
864 out:
865 sess_data->result = rc;
866 sess_data->func = NULL;
867 sess_free_buffer(sess_data);
868 kfree(ses->auth_key.response);
869 ses->auth_key.response = NULL;
870 }
871
872 static void
sess_auth_ntlmv2(struct sess_data * sess_data)873 sess_auth_ntlmv2(struct sess_data *sess_data)
874 {
875 int rc = 0;
876 struct smb_hdr *smb_buf;
877 SESSION_SETUP_ANDX *pSMB;
878 char *bcc_ptr;
879 struct cifs_ses *ses = sess_data->ses;
880 __u32 capabilities;
881 __u16 bytes_remaining;
882
883 /* old style NTLM sessionsetup */
884 /* wct = 13 */
885 rc = sess_alloc_buffer(sess_data, 13);
886 if (rc)
887 goto out;
888
889 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
890 bcc_ptr = sess_data->iov[2].iov_base;
891 capabilities = cifs_ssetup_hdr(ses, pSMB);
892
893 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
894
895 /* LM2 password would be here if we supported it */
896 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
897
898 if (ses->user_name != NULL) {
899 /* calculate nlmv2 response and session key */
900 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
901 if (rc) {
902 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
903 goto out;
904 }
905
906 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
907 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
908 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
909
910 /* set case sensitive password length after tilen may get
911 * assigned, tilen is 0 otherwise.
912 */
913 pSMB->req_no_secext.CaseSensitivePasswordLength =
914 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
915 } else {
916 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
917 }
918
919 if (ses->capabilities & CAP_UNICODE) {
920 if (sess_data->iov[0].iov_len % 2) {
921 *bcc_ptr = 0;
922 bcc_ptr++;
923 }
924 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
925 } else {
926 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
927 }
928
929
930 sess_data->iov[2].iov_len = (long) bcc_ptr -
931 (long) sess_data->iov[2].iov_base;
932
933 rc = sess_sendreceive(sess_data);
934 if (rc)
935 goto out;
936
937 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
938 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
939
940 if (smb_buf->WordCount != 3) {
941 rc = -EIO;
942 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
943 goto out;
944 }
945
946 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
947 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
948
949 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
950 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
951
952 bytes_remaining = get_bcc(smb_buf);
953 bcc_ptr = pByteArea(smb_buf);
954
955 /* BB check if Unicode and decode strings */
956 if (bytes_remaining == 0) {
957 /* no string area to decode, do nothing */
958 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
959 /* unicode string area must be word-aligned */
960 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
961 ++bcc_ptr;
962 --bytes_remaining;
963 }
964 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
965 sess_data->nls_cp);
966 } else {
967 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
968 sess_data->nls_cp);
969 }
970
971 rc = sess_establish_session(sess_data);
972 out:
973 sess_data->result = rc;
974 sess_data->func = NULL;
975 sess_free_buffer(sess_data);
976 kfree(ses->auth_key.response);
977 ses->auth_key.response = NULL;
978 }
979
980 #ifdef CONFIG_CIFS_UPCALL
981 static void
sess_auth_kerberos(struct sess_data * sess_data)982 sess_auth_kerberos(struct sess_data *sess_data)
983 {
984 int rc = 0;
985 struct smb_hdr *smb_buf;
986 SESSION_SETUP_ANDX *pSMB;
987 char *bcc_ptr;
988 struct cifs_ses *ses = sess_data->ses;
989 __u32 capabilities;
990 __u16 bytes_remaining;
991 struct key *spnego_key = NULL;
992 struct cifs_spnego_msg *msg;
993 u16 blob_len;
994
995 /* extended security */
996 /* wct = 12 */
997 rc = sess_alloc_buffer(sess_data, 12);
998 if (rc)
999 goto out;
1000
1001 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1002 bcc_ptr = sess_data->iov[2].iov_base;
1003 capabilities = cifs_ssetup_hdr(ses, pSMB);
1004
1005 spnego_key = cifs_get_spnego_key(ses);
1006 if (IS_ERR(spnego_key)) {
1007 rc = PTR_ERR(spnego_key);
1008 spnego_key = NULL;
1009 goto out;
1010 }
1011
1012 msg = spnego_key->payload.data[0];
1013 /*
1014 * check version field to make sure that cifs.upcall is
1015 * sending us a response in an expected form
1016 */
1017 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1018 cifs_dbg(VFS,
1019 "incorrect version of cifs.upcall (expected %d but got %d)",
1020 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1021 rc = -EKEYREJECTED;
1022 goto out_put_spnego_key;
1023 }
1024
1025 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1026 GFP_KERNEL);
1027 if (!ses->auth_key.response) {
1028 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory",
1029 msg->sesskey_len);
1030 rc = -ENOMEM;
1031 goto out_put_spnego_key;
1032 }
1033 ses->auth_key.len = msg->sesskey_len;
1034
1035 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1036 capabilities |= CAP_EXTENDED_SECURITY;
1037 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1038 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1039 sess_data->iov[1].iov_len = msg->secblob_len;
1040 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1041
1042 if (ses->capabilities & CAP_UNICODE) {
1043 /* unicode strings must be word aligned */
1044 if ((sess_data->iov[0].iov_len
1045 + sess_data->iov[1].iov_len) % 2) {
1046 *bcc_ptr = 0;
1047 bcc_ptr++;
1048 }
1049 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1050 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1051 } else {
1052 /* BB: is this right? */
1053 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1054 }
1055
1056 sess_data->iov[2].iov_len = (long) bcc_ptr -
1057 (long) sess_data->iov[2].iov_base;
1058
1059 rc = sess_sendreceive(sess_data);
1060 if (rc)
1061 goto out_put_spnego_key;
1062
1063 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1064 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1065
1066 if (smb_buf->WordCount != 4) {
1067 rc = -EIO;
1068 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1069 goto out_put_spnego_key;
1070 }
1071
1072 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1073 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1074
1075 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1076 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1077
1078 bytes_remaining = get_bcc(smb_buf);
1079 bcc_ptr = pByteArea(smb_buf);
1080
1081 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1082 if (blob_len > bytes_remaining) {
1083 cifs_dbg(VFS, "bad security blob length %d\n",
1084 blob_len);
1085 rc = -EINVAL;
1086 goto out_put_spnego_key;
1087 }
1088 bcc_ptr += blob_len;
1089 bytes_remaining -= blob_len;
1090
1091 /* BB check if Unicode and decode strings */
1092 if (bytes_remaining == 0) {
1093 /* no string area to decode, do nothing */
1094 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1095 /* unicode string area must be word-aligned */
1096 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1097 ++bcc_ptr;
1098 --bytes_remaining;
1099 }
1100 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1101 sess_data->nls_cp);
1102 } else {
1103 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1104 sess_data->nls_cp);
1105 }
1106
1107 rc = sess_establish_session(sess_data);
1108 out_put_spnego_key:
1109 key_invalidate(spnego_key);
1110 key_put(spnego_key);
1111 out:
1112 sess_data->result = rc;
1113 sess_data->func = NULL;
1114 sess_free_buffer(sess_data);
1115 kfree(ses->auth_key.response);
1116 ses->auth_key.response = NULL;
1117 }
1118
1119 #endif /* ! CONFIG_CIFS_UPCALL */
1120
1121 /*
1122 * The required kvec buffers have to be allocated before calling this
1123 * function.
1124 */
1125 static int
_sess_auth_rawntlmssp_assemble_req(struct sess_data * sess_data)1126 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1127 {
1128 struct smb_hdr *smb_buf;
1129 SESSION_SETUP_ANDX *pSMB;
1130 struct cifs_ses *ses = sess_data->ses;
1131 __u32 capabilities;
1132 char *bcc_ptr;
1133
1134 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1135 smb_buf = (struct smb_hdr *)pSMB;
1136
1137 capabilities = cifs_ssetup_hdr(ses, pSMB);
1138 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1139 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1140 return -ENOSYS;
1141 }
1142
1143 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1144 capabilities |= CAP_EXTENDED_SECURITY;
1145 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1146
1147 bcc_ptr = sess_data->iov[2].iov_base;
1148 /* unicode strings must be word aligned */
1149 if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1150 *bcc_ptr = 0;
1151 bcc_ptr++;
1152 }
1153 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1154
1155 sess_data->iov[2].iov_len = (long) bcc_ptr -
1156 (long) sess_data->iov[2].iov_base;
1157
1158 return 0;
1159 }
1160
1161 static void
1162 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1163
1164 static void
sess_auth_rawntlmssp_negotiate(struct sess_data * sess_data)1165 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1166 {
1167 int rc;
1168 struct smb_hdr *smb_buf;
1169 SESSION_SETUP_ANDX *pSMB;
1170 struct cifs_ses *ses = sess_data->ses;
1171 __u16 bytes_remaining;
1172 char *bcc_ptr;
1173 u16 blob_len;
1174
1175 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1176
1177 /*
1178 * if memory allocation is successful, caller of this function
1179 * frees it.
1180 */
1181 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1182 if (!ses->ntlmssp) {
1183 rc = -ENOMEM;
1184 goto out;
1185 }
1186 ses->ntlmssp->sesskey_per_smbsess = false;
1187
1188 /* wct = 12 */
1189 rc = sess_alloc_buffer(sess_data, 12);
1190 if (rc)
1191 goto out;
1192
1193 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1194
1195 /* Build security blob before we assemble the request */
1196 build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
1197 sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
1198 sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
1199 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
1200
1201 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1202 if (rc)
1203 goto out;
1204
1205 rc = sess_sendreceive(sess_data);
1206
1207 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1208 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1209
1210 /* If true, rc here is expected and not an error */
1211 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1212 smb_buf->Status.CifsError ==
1213 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1214 rc = 0;
1215
1216 if (rc)
1217 goto out;
1218
1219 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1220
1221 if (smb_buf->WordCount != 4) {
1222 rc = -EIO;
1223 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1224 goto out;
1225 }
1226
1227 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1228 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1229
1230 bytes_remaining = get_bcc(smb_buf);
1231 bcc_ptr = pByteArea(smb_buf);
1232
1233 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1234 if (blob_len > bytes_remaining) {
1235 cifs_dbg(VFS, "bad security blob length %d\n",
1236 blob_len);
1237 rc = -EINVAL;
1238 goto out;
1239 }
1240
1241 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1242 out:
1243 sess_free_buffer(sess_data);
1244
1245 if (!rc) {
1246 sess_data->func = sess_auth_rawntlmssp_authenticate;
1247 return;
1248 }
1249
1250 /* Else error. Cleanup */
1251 kfree(ses->auth_key.response);
1252 ses->auth_key.response = NULL;
1253 kfree(ses->ntlmssp);
1254 ses->ntlmssp = NULL;
1255
1256 sess_data->func = NULL;
1257 sess_data->result = rc;
1258 }
1259
1260 static void
sess_auth_rawntlmssp_authenticate(struct sess_data * sess_data)1261 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1262 {
1263 int rc;
1264 struct smb_hdr *smb_buf;
1265 SESSION_SETUP_ANDX *pSMB;
1266 struct cifs_ses *ses = sess_data->ses;
1267 __u16 bytes_remaining;
1268 char *bcc_ptr;
1269 char *ntlmsspblob = NULL;
1270 u16 blob_len;
1271
1272 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1273
1274 /* wct = 12 */
1275 rc = sess_alloc_buffer(sess_data, 12);
1276 if (rc)
1277 goto out;
1278
1279 /* Build security blob before we assemble the request */
1280 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1281 smb_buf = (struct smb_hdr *)pSMB;
1282 /*
1283 * 5 is an empirical value, large enough to hold
1284 * authenticate message plus max 10 of av paris,
1285 * domain, user, workstation names, flags, etc.
1286 */
1287 ntlmsspblob = kzalloc(5*sizeof(struct _AUTHENTICATE_MESSAGE),
1288 GFP_KERNEL);
1289 if (!ntlmsspblob) {
1290 rc = -ENOMEM;
1291 goto out;
1292 }
1293
1294 rc = build_ntlmssp_auth_blob(ntlmsspblob,
1295 &blob_len, ses, sess_data->nls_cp);
1296 if (rc)
1297 goto out_free_ntlmsspblob;
1298 sess_data->iov[1].iov_len = blob_len;
1299 sess_data->iov[1].iov_base = ntlmsspblob;
1300 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1301 /*
1302 * Make sure that we tell the server that we are using
1303 * the uid that it just gave us back on the response
1304 * (challenge)
1305 */
1306 smb_buf->Uid = ses->Suid;
1307
1308 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1309 if (rc)
1310 goto out_free_ntlmsspblob;
1311
1312 rc = sess_sendreceive(sess_data);
1313 if (rc)
1314 goto out_free_ntlmsspblob;
1315
1316 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1317 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1318 if (smb_buf->WordCount != 4) {
1319 rc = -EIO;
1320 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1321 goto out_free_ntlmsspblob;
1322 }
1323
1324 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1325 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1326
1327 if (ses->Suid != smb_buf->Uid) {
1328 ses->Suid = smb_buf->Uid;
1329 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1330 }
1331
1332 bytes_remaining = get_bcc(smb_buf);
1333 bcc_ptr = pByteArea(smb_buf);
1334 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1335 if (blob_len > bytes_remaining) {
1336 cifs_dbg(VFS, "bad security blob length %d\n",
1337 blob_len);
1338 rc = -EINVAL;
1339 goto out_free_ntlmsspblob;
1340 }
1341 bcc_ptr += blob_len;
1342 bytes_remaining -= blob_len;
1343
1344
1345 /* BB check if Unicode and decode strings */
1346 if (bytes_remaining == 0) {
1347 /* no string area to decode, do nothing */
1348 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1349 /* unicode string area must be word-aligned */
1350 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1351 ++bcc_ptr;
1352 --bytes_remaining;
1353 }
1354 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1355 sess_data->nls_cp);
1356 } else {
1357 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1358 sess_data->nls_cp);
1359 }
1360
1361 out_free_ntlmsspblob:
1362 kfree(ntlmsspblob);
1363 out:
1364 sess_free_buffer(sess_data);
1365
1366 if (!rc)
1367 rc = sess_establish_session(sess_data);
1368
1369 /* Cleanup */
1370 kfree(ses->auth_key.response);
1371 ses->auth_key.response = NULL;
1372 kfree(ses->ntlmssp);
1373 ses->ntlmssp = NULL;
1374
1375 sess_data->func = NULL;
1376 sess_data->result = rc;
1377 }
1378
select_sec(struct cifs_ses * ses,struct sess_data * sess_data)1379 static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
1380 {
1381 int type;
1382
1383 type = select_sectype(ses->server, ses->sectype);
1384 cifs_dbg(FYI, "sess setup type %d\n", type);
1385 if (type == Unspecified) {
1386 cifs_dbg(VFS,
1387 "Unable to select appropriate authentication method!");
1388 return -EINVAL;
1389 }
1390
1391 switch (type) {
1392 case LANMAN:
1393 /* LANMAN and plaintext are less secure and off by default.
1394 * So we make this explicitly be turned on in kconfig (in the
1395 * build) and turned on at runtime (changed from the default)
1396 * in proc/fs/cifs or via mount parm. Unfortunately this is
1397 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
1398 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1399 sess_data->func = sess_auth_lanman;
1400 break;
1401 #else
1402 return -EOPNOTSUPP;
1403 #endif
1404 case NTLM:
1405 sess_data->func = sess_auth_ntlm;
1406 break;
1407 case NTLMv2:
1408 sess_data->func = sess_auth_ntlmv2;
1409 break;
1410 case Kerberos:
1411 #ifdef CONFIG_CIFS_UPCALL
1412 sess_data->func = sess_auth_kerberos;
1413 break;
1414 #else
1415 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1416 return -ENOSYS;
1417 break;
1418 #endif /* CONFIG_CIFS_UPCALL */
1419 case RawNTLMSSP:
1420 sess_data->func = sess_auth_rawntlmssp_negotiate;
1421 break;
1422 default:
1423 cifs_dbg(VFS, "secType %d not supported!\n", type);
1424 return -ENOSYS;
1425 }
1426
1427 return 0;
1428 }
1429
CIFS_SessSetup(const unsigned int xid,struct cifs_ses * ses,const struct nls_table * nls_cp)1430 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1431 const struct nls_table *nls_cp)
1432 {
1433 int rc = 0;
1434 struct sess_data *sess_data;
1435
1436 if (ses == NULL) {
1437 WARN(1, "%s: ses == NULL!", __func__);
1438 return -EINVAL;
1439 }
1440
1441 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1442 if (!sess_data)
1443 return -ENOMEM;
1444
1445 rc = select_sec(ses, sess_data);
1446 if (rc)
1447 goto out;
1448
1449 sess_data->xid = xid;
1450 sess_data->ses = ses;
1451 sess_data->buf0_type = CIFS_NO_BUFFER;
1452 sess_data->nls_cp = (struct nls_table *) nls_cp;
1453
1454 while (sess_data->func)
1455 sess_data->func(sess_data);
1456
1457 /* Store result before we free sess_data */
1458 rc = sess_data->result;
1459
1460 out:
1461 kfree(sess_data);
1462 return rc;
1463 }
1464