4 * SMB/CIFS session setup handling routines
6 * Copyright (c) International Business Machines Corp., 2006, 2009
7 * Author(s): Steve French (sfrench@us.ibm.com)
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.
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.
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
26 #include "cifsproto.h"
27 #include "cifs_unicode.h"
28 #include "cifs_debug.h"
31 #include <linux/utsname.h>
32 #include <linux/slab.h>
33 #include "cifs_spnego.h"
36 * Checks if this is the first smb session to be reconnected after
37 * the socket has been reestablished (so we know whether to use vc 0).
38 * Called while holding the cifs_tcp_ses_lock, so do not block
40 static bool is_first_ses_reconnect(struct cifs_ses
*ses
)
42 struct list_head
*tmp
;
43 struct cifs_ses
*tmp_ses
;
45 list_for_each(tmp
, &ses
->server
->smb_ses_list
) {
46 tmp_ses
= list_entry(tmp
, struct cifs_ses
,
48 if (tmp_ses
->need_reconnect
== false)
51 /* could not find a session that was already connected,
52 this must be the first one we are reconnecting */
57 * vc number 0 is treated specially by some servers, and should be the
58 * first one we request. After that we can use vcnumbers up to maxvcs,
59 * one for each smb session (some Windows versions set maxvcs incorrectly
60 * so maxvc=1 can be ignored). If we have too many vcs, we can reuse
61 * any vc but zero (some servers reset the connection on vcnum zero)
64 static __le16
get_next_vcnum(struct cifs_ses
*ses
)
67 struct list_head
*tmp
;
68 struct cifs_ses
*tmp_ses
;
69 __u16 max_vcs
= ses
->server
->max_vcs
;
71 int free_vc_found
= 0;
73 /* Quoting the MS-SMB specification: "Windows-based SMB servers set this
74 field to one but do not enforce this limit, which allows an SMB client
75 to establish more virtual circuits than allowed by this value ... but
76 other server implementations can enforce this limit." */
80 spin_lock(&cifs_tcp_ses_lock
);
81 if ((ses
->need_reconnect
) && is_first_ses_reconnect(ses
))
82 goto get_vc_num_exit
; /* vcnum will be zero */
83 for (i
= ses
->server
->srv_count
- 1; i
< max_vcs
; i
++) {
84 if (i
== 0) /* this is the only connection, use vc 0 */
89 list_for_each(tmp
, &ses
->server
->smb_ses_list
) {
90 tmp_ses
= list_entry(tmp
, struct cifs_ses
,
92 if (tmp_ses
->vcnum
== i
) {
94 break; /* found duplicate, try next vcnum */
98 break; /* we found a vcnumber that will work - use it */
102 vcnum
= 0; /* for most common case, ie if one smb session, use
103 vc zero. Also for case when no free vcnum, zero
104 is safest to send (some clients only send zero) */
105 else if (free_vc_found
== 0)
106 vcnum
= 1; /* we can not reuse vc=0 safely, since some servers
107 reset all uids on that, but 1 is ok. */
112 spin_unlock(&cifs_tcp_ses_lock
);
114 return cpu_to_le16(vcnum
);
117 static __u32
cifs_ssetup_hdr(struct cifs_ses
*ses
, SESSION_SETUP_ANDX
*pSMB
)
119 __u32 capabilities
= 0;
121 /* init fields common to all four types of SessSetup */
122 /* Note that offsets for first seven fields in req struct are same */
123 /* in CIFS Specs so does not matter which of 3 forms of struct */
124 /* that we use in next few lines */
125 /* Note that header is initialized to zero in header_assemble */
126 pSMB
->req
.AndXCommand
= 0xFF;
127 pSMB
->req
.MaxBufferSize
= cpu_to_le16(min_t(u32
,
128 CIFSMaxBufSize
+ MAX_CIFS_HDR_SIZE
- 4,
130 pSMB
->req
.MaxMpxCount
= cpu_to_le16(ses
->server
->maxReq
);
131 pSMB
->req
.VcNumber
= get_next_vcnum(ses
);
133 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
135 /* BB verify whether signing required on neg or just on auth frame
138 capabilities
= CAP_LARGE_FILES
| CAP_NT_SMBS
| CAP_LEVEL_II_OPLOCKS
|
139 CAP_LARGE_WRITE_X
| CAP_LARGE_READ_X
;
141 if (ses
->server
->sec_mode
&
142 (SECMODE_SIGN_REQUIRED
| SECMODE_SIGN_ENABLED
))
143 pSMB
->req
.hdr
.Flags2
|= SMBFLG2_SECURITY_SIGNATURE
;
145 if (ses
->capabilities
& CAP_UNICODE
) {
146 pSMB
->req
.hdr
.Flags2
|= SMBFLG2_UNICODE
;
147 capabilities
|= CAP_UNICODE
;
149 if (ses
->capabilities
& CAP_STATUS32
) {
150 pSMB
->req
.hdr
.Flags2
|= SMBFLG2_ERR_STATUS
;
151 capabilities
|= CAP_STATUS32
;
153 if (ses
->capabilities
& CAP_DFS
) {
154 pSMB
->req
.hdr
.Flags2
|= SMBFLG2_DFS
;
155 capabilities
|= CAP_DFS
;
157 if (ses
->capabilities
& CAP_UNIX
)
158 capabilities
|= CAP_UNIX
;
164 unicode_oslm_strings(char **pbcc_area
, const struct nls_table
*nls_cp
)
166 char *bcc_ptr
= *pbcc_area
;
169 /* Copy OS version */
170 bytes_ret
= cifs_strtoUTF16((__le16
*)bcc_ptr
, "Linux version ", 32,
172 bcc_ptr
+= 2 * bytes_ret
;
173 bytes_ret
= cifs_strtoUTF16((__le16
*) bcc_ptr
, init_utsname()->release
,
175 bcc_ptr
+= 2 * bytes_ret
;
176 bcc_ptr
+= 2; /* trailing null */
178 bytes_ret
= cifs_strtoUTF16((__le16
*) bcc_ptr
, CIFS_NETWORK_OPSYS
,
180 bcc_ptr
+= 2 * bytes_ret
;
181 bcc_ptr
+= 2; /* trailing null */
183 *pbcc_area
= bcc_ptr
;
186 static void unicode_domain_string(char **pbcc_area
, struct cifs_ses
*ses
,
187 const struct nls_table
*nls_cp
)
189 char *bcc_ptr
= *pbcc_area
;
193 if (ses
->domainName
== NULL
) {
194 /* Sending null domain better than using a bogus domain name (as
195 we did briefly in 2.6.18) since server will use its default */
200 bytes_ret
= cifs_strtoUTF16((__le16
*) bcc_ptr
, ses
->domainName
,
202 bcc_ptr
+= 2 * bytes_ret
;
203 bcc_ptr
+= 2; /* account for null terminator */
205 *pbcc_area
= bcc_ptr
;
209 static void unicode_ssetup_strings(char **pbcc_area
, struct cifs_ses
*ses
,
210 const struct nls_table
*nls_cp
)
212 char *bcc_ptr
= *pbcc_area
;
215 /* BB FIXME add check that strings total less
216 than 335 or will need to send them as arrays */
218 /* unicode strings, must be word aligned before the call */
219 /* if ((long) bcc_ptr % 2) {
224 if (ses
->user_name
== NULL
) {
225 /* null user mount */
229 bytes_ret
= cifs_strtoUTF16((__le16
*) bcc_ptr
, ses
->user_name
,
230 MAX_USERNAME_SIZE
, nls_cp
);
232 bcc_ptr
+= 2 * bytes_ret
;
233 bcc_ptr
+= 2; /* account for null termination */
235 unicode_domain_string(&bcc_ptr
, ses
, nls_cp
);
236 unicode_oslm_strings(&bcc_ptr
, nls_cp
);
238 *pbcc_area
= bcc_ptr
;
241 static void ascii_ssetup_strings(char **pbcc_area
, struct cifs_ses
*ses
,
242 const struct nls_table
*nls_cp
)
244 char *bcc_ptr
= *pbcc_area
;
247 /* BB what about null user mounts - check that we do this BB */
249 if (ses
->user_name
!= NULL
) {
250 strncpy(bcc_ptr
, ses
->user_name
, MAX_USERNAME_SIZE
);
251 bcc_ptr
+= strnlen(ses
->user_name
, MAX_USERNAME_SIZE
);
253 /* else null user mount */
255 bcc_ptr
++; /* account for null termination */
258 if (ses
->domainName
!= NULL
) {
259 strncpy(bcc_ptr
, ses
->domainName
, 256);
260 bcc_ptr
+= strnlen(ses
->domainName
, 256);
261 } /* else we will send a null domain name
262 so the server will default to its own domain */
266 /* BB check for overflow here */
268 strcpy(bcc_ptr
, "Linux version ");
269 bcc_ptr
+= strlen("Linux version ");
270 strcpy(bcc_ptr
, init_utsname()->release
);
271 bcc_ptr
+= strlen(init_utsname()->release
) + 1;
273 strcpy(bcc_ptr
, CIFS_NETWORK_OPSYS
);
274 bcc_ptr
+= strlen(CIFS_NETWORK_OPSYS
) + 1;
276 *pbcc_area
= bcc_ptr
;
280 decode_unicode_ssetup(char **pbcc_area
, int bleft
, struct cifs_ses
*ses
,
281 const struct nls_table
*nls_cp
)
284 char *data
= *pbcc_area
;
286 cifs_dbg(FYI
, "bleft %d\n", bleft
);
288 kfree(ses
->serverOS
);
289 ses
->serverOS
= cifs_strndup_from_utf16(data
, bleft
, true, nls_cp
);
290 cifs_dbg(FYI
, "serverOS=%s\n", ses
->serverOS
);
291 len
= (UniStrnlen((wchar_t *) data
, bleft
/ 2) * 2) + 2;
297 kfree(ses
->serverNOS
);
298 ses
->serverNOS
= cifs_strndup_from_utf16(data
, bleft
, true, nls_cp
);
299 cifs_dbg(FYI
, "serverNOS=%s\n", ses
->serverNOS
);
300 len
= (UniStrnlen((wchar_t *) data
, bleft
/ 2) * 2) + 2;
306 kfree(ses
->serverDomain
);
307 ses
->serverDomain
= cifs_strndup_from_utf16(data
, bleft
, true, nls_cp
);
308 cifs_dbg(FYI
, "serverDomain=%s\n", ses
->serverDomain
);
313 static void decode_ascii_ssetup(char **pbcc_area
, __u16 bleft
,
314 struct cifs_ses
*ses
,
315 const struct nls_table
*nls_cp
)
318 char *bcc_ptr
= *pbcc_area
;
320 cifs_dbg(FYI
, "decode sessetup ascii. bleft %d\n", bleft
);
322 len
= strnlen(bcc_ptr
, bleft
);
326 kfree(ses
->serverOS
);
328 ses
->serverOS
= kzalloc(len
+ 1, GFP_KERNEL
);
330 strncpy(ses
->serverOS
, bcc_ptr
, len
);
331 if (strncmp(ses
->serverOS
, "OS/2", 4) == 0)
332 cifs_dbg(FYI
, "OS/2 server\n");
337 len
= strnlen(bcc_ptr
, bleft
);
341 kfree(ses
->serverNOS
);
343 ses
->serverNOS
= kzalloc(len
+ 1, GFP_KERNEL
);
345 strncpy(ses
->serverNOS
, bcc_ptr
, len
);
350 len
= strnlen(bcc_ptr
, bleft
);
354 /* No domain field in LANMAN case. Domain is
355 returned by old servers in the SMB negprot response */
356 /* BB For newer servers which do not support Unicode,
357 but thus do return domain here we could add parsing
358 for it later, but it is not very important */
359 cifs_dbg(FYI
, "ascii: bytes left %d\n", bleft
);
362 int decode_ntlmssp_challenge(char *bcc_ptr
, int blob_len
,
363 struct cifs_ses
*ses
)
365 unsigned int tioffset
; /* challenge message target info area */
366 unsigned int tilen
; /* challenge message target info area length */
368 CHALLENGE_MESSAGE
*pblob
= (CHALLENGE_MESSAGE
*)bcc_ptr
;
370 if (blob_len
< sizeof(CHALLENGE_MESSAGE
)) {
371 cifs_dbg(VFS
, "challenge blob len %d too small\n", blob_len
);
375 if (memcmp(pblob
->Signature
, "NTLMSSP", 8)) {
376 cifs_dbg(VFS
, "blob signature incorrect %s\n",
380 if (pblob
->MessageType
!= NtLmChallenge
) {
381 cifs_dbg(VFS
, "Incorrect message type %d\n",
386 memcpy(ses
->ntlmssp
->cryptkey
, pblob
->Challenge
, CIFS_CRYPTO_KEY_SIZE
);
387 /* BB we could decode pblob->NegotiateFlags; some may be useful */
388 /* In particular we can examine sign flags */
389 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
390 we must set the MIC field of the AUTHENTICATE_MESSAGE */
391 ses
->ntlmssp
->server_flags
= le32_to_cpu(pblob
->NegotiateFlags
);
392 tioffset
= le32_to_cpu(pblob
->TargetInfoArray
.BufferOffset
);
393 tilen
= le16_to_cpu(pblob
->TargetInfoArray
.Length
);
394 if (tioffset
> blob_len
|| tioffset
+ tilen
> blob_len
) {
395 cifs_dbg(VFS
, "tioffset + tilen too high %u + %u",
400 ses
->auth_key
.response
= kmemdup(bcc_ptr
+ tioffset
, tilen
,
402 if (!ses
->auth_key
.response
) {
403 cifs_dbg(VFS
, "Challenge target info alloc failure");
406 ses
->auth_key
.len
= tilen
;
412 /* BB Move to ntlmssp.c eventually */
414 /* We do not malloc the blob, it is passed in pbuffer, because
415 it is fixed size, and small, making this approach cleaner */
416 void build_ntlmssp_negotiate_blob(unsigned char *pbuffer
,
417 struct cifs_ses
*ses
)
419 NEGOTIATE_MESSAGE
*sec_blob
= (NEGOTIATE_MESSAGE
*)pbuffer
;
422 memset(pbuffer
, 0, sizeof(NEGOTIATE_MESSAGE
));
423 memcpy(sec_blob
->Signature
, NTLMSSP_SIGNATURE
, 8);
424 sec_blob
->MessageType
= NtLmNegotiate
;
426 /* BB is NTLMV2 session security format easier to use here? */
427 flags
= NTLMSSP_NEGOTIATE_56
| NTLMSSP_REQUEST_TARGET
|
428 NTLMSSP_NEGOTIATE_128
| NTLMSSP_NEGOTIATE_UNICODE
|
429 NTLMSSP_NEGOTIATE_NTLM
| NTLMSSP_NEGOTIATE_EXTENDED_SEC
;
430 if (ses
->server
->sec_mode
&
431 (SECMODE_SIGN_REQUIRED
| SECMODE_SIGN_ENABLED
)) {
432 flags
|= NTLMSSP_NEGOTIATE_SIGN
;
433 if (!ses
->server
->session_estab
)
434 flags
|= NTLMSSP_NEGOTIATE_KEY_XCH
;
437 sec_blob
->NegotiateFlags
= cpu_to_le32(flags
);
439 sec_blob
->WorkstationName
.BufferOffset
= 0;
440 sec_blob
->WorkstationName
.Length
= 0;
441 sec_blob
->WorkstationName
.MaximumLength
= 0;
443 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
444 sec_blob
->DomainName
.BufferOffset
= 0;
445 sec_blob
->DomainName
.Length
= 0;
446 sec_blob
->DomainName
.MaximumLength
= 0;
449 /* We do not malloc the blob, it is passed in pbuffer, because its
450 maximum possible size is fixed and small, making this approach cleaner.
451 This function returns the length of the data in the blob */
452 int build_ntlmssp_auth_blob(unsigned char *pbuffer
,
454 struct cifs_ses
*ses
,
455 const struct nls_table
*nls_cp
)
458 AUTHENTICATE_MESSAGE
*sec_blob
= (AUTHENTICATE_MESSAGE
*)pbuffer
;
462 memcpy(sec_blob
->Signature
, NTLMSSP_SIGNATURE
, 8);
463 sec_blob
->MessageType
= NtLmAuthenticate
;
465 flags
= NTLMSSP_NEGOTIATE_56
|
466 NTLMSSP_REQUEST_TARGET
| NTLMSSP_NEGOTIATE_TARGET_INFO
|
467 NTLMSSP_NEGOTIATE_128
| NTLMSSP_NEGOTIATE_UNICODE
|
468 NTLMSSP_NEGOTIATE_NTLM
| NTLMSSP_NEGOTIATE_EXTENDED_SEC
;
469 if (ses
->server
->sec_mode
&
470 (SECMODE_SIGN_REQUIRED
| SECMODE_SIGN_ENABLED
)) {
471 flags
|= NTLMSSP_NEGOTIATE_SIGN
;
472 if (!ses
->server
->session_estab
)
473 flags
|= NTLMSSP_NEGOTIATE_KEY_XCH
;
476 tmp
= pbuffer
+ sizeof(AUTHENTICATE_MESSAGE
);
477 sec_blob
->NegotiateFlags
= cpu_to_le32(flags
);
479 sec_blob
->LmChallengeResponse
.BufferOffset
=
480 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE
));
481 sec_blob
->LmChallengeResponse
.Length
= 0;
482 sec_blob
->LmChallengeResponse
.MaximumLength
= 0;
484 sec_blob
->NtChallengeResponse
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
485 rc
= setup_ntlmv2_rsp(ses
, nls_cp
);
487 cifs_dbg(VFS
, "Error %d during NTLMSSP authentication\n", rc
);
488 goto setup_ntlmv2_ret
;
490 memcpy(tmp
, ses
->auth_key
.response
+ CIFS_SESS_KEY_SIZE
,
491 ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
);
492 tmp
+= ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
;
494 sec_blob
->NtChallengeResponse
.Length
=
495 cpu_to_le16(ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
);
496 sec_blob
->NtChallengeResponse
.MaximumLength
=
497 cpu_to_le16(ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
);
499 if (ses
->domainName
== NULL
) {
500 sec_blob
->DomainName
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
501 sec_blob
->DomainName
.Length
= 0;
502 sec_blob
->DomainName
.MaximumLength
= 0;
506 len
= cifs_strtoUTF16((__le16
*)tmp
, ses
->domainName
,
507 MAX_USERNAME_SIZE
, nls_cp
);
508 len
*= 2; /* unicode is 2 bytes each */
509 sec_blob
->DomainName
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
510 sec_blob
->DomainName
.Length
= cpu_to_le16(len
);
511 sec_blob
->DomainName
.MaximumLength
= cpu_to_le16(len
);
515 if (ses
->user_name
== NULL
) {
516 sec_blob
->UserName
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
517 sec_blob
->UserName
.Length
= 0;
518 sec_blob
->UserName
.MaximumLength
= 0;
522 len
= cifs_strtoUTF16((__le16
*)tmp
, ses
->user_name
,
523 MAX_USERNAME_SIZE
, nls_cp
);
524 len
*= 2; /* unicode is 2 bytes each */
525 sec_blob
->UserName
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
526 sec_blob
->UserName
.Length
= cpu_to_le16(len
);
527 sec_blob
->UserName
.MaximumLength
= cpu_to_le16(len
);
531 sec_blob
->WorkstationName
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
532 sec_blob
->WorkstationName
.Length
= 0;
533 sec_blob
->WorkstationName
.MaximumLength
= 0;
536 if (((ses
->ntlmssp
->server_flags
& NTLMSSP_NEGOTIATE_KEY_XCH
) ||
537 (ses
->ntlmssp
->server_flags
& NTLMSSP_NEGOTIATE_EXTENDED_SEC
))
538 && !calc_seckey(ses
)) {
539 memcpy(tmp
, ses
->ntlmssp
->ciphertext
, CIFS_CPHTXT_SIZE
);
540 sec_blob
->SessionKey
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
541 sec_blob
->SessionKey
.Length
= cpu_to_le16(CIFS_CPHTXT_SIZE
);
542 sec_blob
->SessionKey
.MaximumLength
=
543 cpu_to_le16(CIFS_CPHTXT_SIZE
);
544 tmp
+= CIFS_CPHTXT_SIZE
;
546 sec_blob
->SessionKey
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
547 sec_blob
->SessionKey
.Length
= 0;
548 sec_blob
->SessionKey
.MaximumLength
= 0;
552 *buflen
= tmp
- pbuffer
;
557 CIFS_SessSetup(const unsigned int xid
, struct cifs_ses
*ses
,
558 const struct nls_table
*nls_cp
)
562 struct smb_hdr
*smb_buf
;
565 SESSION_SETUP_ANDX
*pSMB
;
570 enum securityEnum type
;
571 __u16 action
, bytes_remaining
;
572 struct key
*spnego_key
= NULL
;
573 __le32 phase
= NtLmNegotiate
; /* NTLMSSP, if needed, is multistage */
575 char *ntlmsspblob
= NULL
;
578 WARN(1, "%s: ses == NULL!", __func__
);
582 type
= ses
->server
->secType
;
583 cifs_dbg(FYI
, "sess setup type %d\n", type
);
584 if (type
== RawNTLMSSP
) {
585 /* if memory allocation is successful, caller of this function
588 ses
->ntlmssp
= kmalloc(sizeof(struct ntlmssp_auth
), GFP_KERNEL
);
593 ssetup_ntlmssp_authenticate
:
594 if (phase
== NtLmChallenge
)
595 phase
= NtLmAuthenticate
; /* if ntlmssp, now final phase */
597 if (type
== LANMAN
) {
598 #ifndef CONFIG_CIFS_WEAK_PW_HASH
599 /* LANMAN and plaintext are less secure and off by default.
600 So we make this explicitly be turned on in kconfig (in the
601 build) and turned on at runtime (changed from the default)
602 in proc/fs/cifs or via mount parm. Unfortunately this is
603 needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
606 wct
= 10; /* lanman 2 style sessionsetup */
607 } else if ((type
== NTLM
) || (type
== NTLMv2
)) {
608 /* For NTLMv2 failures eventually may need to retry NTLM */
609 wct
= 13; /* old style NTLM sessionsetup */
610 } else /* same size: negotiate or auth, NTLMSSP or extended security */
613 rc
= small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX
, wct
, ses
,
618 pSMB
= (SESSION_SETUP_ANDX
*)smb_buf
;
620 capabilities
= cifs_ssetup_hdr(ses
, pSMB
);
622 /* we will send the SMB in three pieces:
623 a fixed length beginning part, an optional
624 SPNEGO blob (which can be zero length), and a
625 last part which will include the strings
626 and rest of bcc area. This allows us to avoid
627 a large buffer 17K allocation */
628 iov
[0].iov_base
= (char *)pSMB
;
629 iov
[0].iov_len
= be32_to_cpu(smb_buf
->smb_buf_length
) + 4;
631 /* setting this here allows the code at the end of the function
632 to free the request buffer if there's an error */
633 resp_buf_type
= CIFS_SMALL_BUFFER
;
635 /* 2000 big enough to fit max user, domain, NOS name etc. */
636 str_area
= kmalloc(2000, GFP_KERNEL
);
637 if (str_area
== NULL
) {
643 iov
[1].iov_base
= NULL
;
646 if (type
== LANMAN
) {
647 #ifdef CONFIG_CIFS_WEAK_PW_HASH
648 char lnm_session_key
[CIFS_AUTH_RESP_SIZE
];
650 pSMB
->req
.hdr
.Flags2
&= ~SMBFLG2_UNICODE
;
652 /* no capabilities flags in old lanman negotiation */
654 pSMB
->old_req
.PasswordLength
= cpu_to_le16(CIFS_AUTH_RESP_SIZE
);
656 /* Calculate hash with password and copy into bcc_ptr.
657 * Encryption Key (stored as in cryptkey) gets used if the
658 * security mode bit in Negottiate Protocol response states
659 * to use challenge/response method (i.e. Password bit is 1).
662 rc
= calc_lanman_hash(ses
->password
, ses
->server
->cryptkey
,
663 ses
->server
->sec_mode
& SECMODE_PW_ENCRYPT
?
664 true : false, lnm_session_key
);
666 memcpy(bcc_ptr
, (char *)lnm_session_key
, CIFS_AUTH_RESP_SIZE
);
667 bcc_ptr
+= CIFS_AUTH_RESP_SIZE
;
669 /* can not sign if LANMAN negotiated so no need
670 to calculate signing key? but what if server
671 changed to do higher than lanman dialect and
672 we reconnected would we ever calc signing_key? */
674 cifs_dbg(FYI
, "Negotiating LANMAN setting up strings\n");
675 /* Unicode not allowed for LANMAN dialects */
676 ascii_ssetup_strings(&bcc_ptr
, ses
, nls_cp
);
678 } else if (type
== NTLM
) {
679 pSMB
->req_no_secext
.Capabilities
= cpu_to_le32(capabilities
);
680 pSMB
->req_no_secext
.CaseInsensitivePasswordLength
=
681 cpu_to_le16(CIFS_AUTH_RESP_SIZE
);
682 pSMB
->req_no_secext
.CaseSensitivePasswordLength
=
683 cpu_to_le16(CIFS_AUTH_RESP_SIZE
);
685 /* calculate ntlm response and session key */
686 rc
= setup_ntlm_response(ses
, nls_cp
);
688 cifs_dbg(VFS
, "Error %d during NTLM authentication\n",
693 /* copy ntlm response */
694 memcpy(bcc_ptr
, ses
->auth_key
.response
+ CIFS_SESS_KEY_SIZE
,
695 CIFS_AUTH_RESP_SIZE
);
696 bcc_ptr
+= CIFS_AUTH_RESP_SIZE
;
697 memcpy(bcc_ptr
, ses
->auth_key
.response
+ CIFS_SESS_KEY_SIZE
,
698 CIFS_AUTH_RESP_SIZE
);
699 bcc_ptr
+= CIFS_AUTH_RESP_SIZE
;
701 if (ses
->capabilities
& CAP_UNICODE
) {
702 /* unicode strings must be word aligned */
703 if (iov
[0].iov_len
% 2) {
707 unicode_ssetup_strings(&bcc_ptr
, ses
, nls_cp
);
709 ascii_ssetup_strings(&bcc_ptr
, ses
, nls_cp
);
710 } else if (type
== NTLMv2
) {
711 pSMB
->req_no_secext
.Capabilities
= cpu_to_le32(capabilities
);
713 /* LM2 password would be here if we supported it */
714 pSMB
->req_no_secext
.CaseInsensitivePasswordLength
= 0;
716 /* calculate nlmv2 response and session key */
717 rc
= setup_ntlmv2_rsp(ses
, nls_cp
);
719 cifs_dbg(VFS
, "Error %d during NTLMv2 authentication\n",
723 memcpy(bcc_ptr
, ses
->auth_key
.response
+ CIFS_SESS_KEY_SIZE
,
724 ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
);
725 bcc_ptr
+= ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
;
727 /* set case sensitive password length after tilen may get
728 * assigned, tilen is 0 otherwise.
730 pSMB
->req_no_secext
.CaseSensitivePasswordLength
=
731 cpu_to_le16(ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
);
733 if (ses
->capabilities
& CAP_UNICODE
) {
734 if (iov
[0].iov_len
% 2) {
738 unicode_ssetup_strings(&bcc_ptr
, ses
, nls_cp
);
740 ascii_ssetup_strings(&bcc_ptr
, ses
, nls_cp
);
741 } else if (type
== Kerberos
) {
742 #ifdef CONFIG_CIFS_UPCALL
743 struct cifs_spnego_msg
*msg
;
745 spnego_key
= cifs_get_spnego_key(ses
);
746 if (IS_ERR(spnego_key
)) {
747 rc
= PTR_ERR(spnego_key
);
752 msg
= spnego_key
->payload
.data
;
753 /* check version field to make sure that cifs.upcall is
754 sending us a response in an expected form */
755 if (msg
->version
!= CIFS_SPNEGO_UPCALL_VERSION
) {
756 cifs_dbg(VFS
, "incorrect version of cifs.upcall "
757 "expected %d but got %d)",
758 CIFS_SPNEGO_UPCALL_VERSION
, msg
->version
);
763 ses
->auth_key
.response
= kmemdup(msg
->data
, msg
->sesskey_len
,
765 if (!ses
->auth_key
.response
) {
766 cifs_dbg(VFS
, "Kerberos can't allocate (%u bytes) memory",
771 ses
->auth_key
.len
= msg
->sesskey_len
;
773 pSMB
->req
.hdr
.Flags2
|= SMBFLG2_EXT_SEC
;
774 capabilities
|= CAP_EXTENDED_SECURITY
;
775 pSMB
->req
.Capabilities
= cpu_to_le32(capabilities
);
776 iov
[1].iov_base
= msg
->data
+ msg
->sesskey_len
;
777 iov
[1].iov_len
= msg
->secblob_len
;
778 pSMB
->req
.SecurityBlobLength
= cpu_to_le16(iov
[1].iov_len
);
780 if (ses
->capabilities
& CAP_UNICODE
) {
781 /* unicode strings must be word aligned */
782 if ((iov
[0].iov_len
+ iov
[1].iov_len
) % 2) {
786 unicode_oslm_strings(&bcc_ptr
, nls_cp
);
787 unicode_domain_string(&bcc_ptr
, ses
, nls_cp
);
789 /* BB: is this right? */
790 ascii_ssetup_strings(&bcc_ptr
, ses
, nls_cp
);
791 #else /* ! CONFIG_CIFS_UPCALL */
792 cifs_dbg(VFS
, "Kerberos negotiated but upcall support disabled!\n");
795 #endif /* CONFIG_CIFS_UPCALL */
796 } else if (type
== RawNTLMSSP
) {
797 if ((pSMB
->req
.hdr
.Flags2
& SMBFLG2_UNICODE
) == 0) {
798 cifs_dbg(VFS
, "NTLMSSP requires Unicode support\n");
803 cifs_dbg(FYI
, "ntlmssp session setup phase %d\n", phase
);
804 pSMB
->req
.hdr
.Flags2
|= SMBFLG2_EXT_SEC
;
805 capabilities
|= CAP_EXTENDED_SECURITY
;
806 pSMB
->req
.Capabilities
|= cpu_to_le32(capabilities
);
809 build_ntlmssp_negotiate_blob(
810 pSMB
->req
.SecurityBlob
, ses
);
811 iov
[1].iov_len
= sizeof(NEGOTIATE_MESSAGE
);
812 iov
[1].iov_base
= pSMB
->req
.SecurityBlob
;
813 pSMB
->req
.SecurityBlobLength
=
814 cpu_to_le16(sizeof(NEGOTIATE_MESSAGE
));
816 case NtLmAuthenticate
:
818 * 5 is an empirical value, large enough to hold
819 * authenticate message plus max 10 of av paris,
820 * domain, user, workstation names, flags, etc.
822 ntlmsspblob
= kzalloc(
823 5*sizeof(struct _AUTHENTICATE_MESSAGE
),
830 rc
= build_ntlmssp_auth_blob(ntlmsspblob
,
831 &blob_len
, ses
, nls_cp
);
834 iov
[1].iov_len
= blob_len
;
835 iov
[1].iov_base
= ntlmsspblob
;
836 pSMB
->req
.SecurityBlobLength
= cpu_to_le16(blob_len
);
838 * Make sure that we tell the server that we are using
839 * the uid that it just gave us back on the response
842 smb_buf
->Uid
= ses
->Suid
;
845 cifs_dbg(VFS
, "invalid phase %d\n", phase
);
849 /* unicode strings must be word aligned */
850 if ((iov
[0].iov_len
+ iov
[1].iov_len
) % 2) {
854 unicode_oslm_strings(&bcc_ptr
, nls_cp
);
856 cifs_dbg(VFS
, "secType %d not supported!\n", type
);
861 iov
[2].iov_base
= str_area
;
862 iov
[2].iov_len
= (long) bcc_ptr
- (long) str_area
;
864 count
= iov
[1].iov_len
+ iov
[2].iov_len
;
865 smb_buf
->smb_buf_length
=
866 cpu_to_be32(be32_to_cpu(smb_buf
->smb_buf_length
) + count
);
868 put_bcc(count
, smb_buf
);
870 rc
= SendReceive2(xid
, ses
, iov
, 3 /* num_iovecs */, &resp_buf_type
,
872 /* SMB request buf freed in SendReceive2 */
874 pSMB
= (SESSION_SETUP_ANDX
*)iov
[0].iov_base
;
875 smb_buf
= (struct smb_hdr
*)iov
[0].iov_base
;
877 if ((type
== RawNTLMSSP
) && (resp_buf_type
!= CIFS_NO_BUFFER
) &&
878 (smb_buf
->Status
.CifsError
==
879 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED
))) {
880 if (phase
!= NtLmNegotiate
) {
881 cifs_dbg(VFS
, "Unexpected more processing error\n");
884 /* NTLMSSP Negotiate sent now processing challenge (response) */
885 phase
= NtLmChallenge
; /* process ntlmssp challenge */
886 rc
= 0; /* MORE_PROC rc is not an error here, but expected */
891 if ((smb_buf
->WordCount
!= 3) && (smb_buf
->WordCount
!= 4)) {
893 cifs_dbg(VFS
, "bad word count %d\n", smb_buf
->WordCount
);
896 action
= le16_to_cpu(pSMB
->resp
.Action
);
897 if (action
& GUEST_LOGIN
)
898 cifs_dbg(FYI
, "Guest login\n"); /* BB mark SesInfo struct? */
899 ses
->Suid
= smb_buf
->Uid
; /* UID left in wire format (le) */
900 cifs_dbg(FYI
, "UID = %llu\n", ses
->Suid
);
901 /* response can have either 3 or 4 word count - Samba sends 3 */
902 /* and lanman response is 3 */
903 bytes_remaining
= get_bcc(smb_buf
);
904 bcc_ptr
= pByteArea(smb_buf
);
906 if (smb_buf
->WordCount
== 4) {
907 blob_len
= le16_to_cpu(pSMB
->resp
.SecurityBlobLength
);
908 if (blob_len
> bytes_remaining
) {
909 cifs_dbg(VFS
, "bad security blob length %d\n",
914 if (phase
== NtLmChallenge
) {
915 rc
= decode_ntlmssp_challenge(bcc_ptr
, blob_len
, ses
);
916 /* now goto beginning for ntlmssp authenticate phase */
921 bytes_remaining
-= blob_len
;
924 /* BB check if Unicode and decode strings */
925 if (bytes_remaining
== 0) {
926 /* no string area to decode, do nothing */
927 } else if (smb_buf
->Flags2
& SMBFLG2_UNICODE
) {
928 /* unicode string area must be word-aligned */
929 if (((unsigned long) bcc_ptr
- (unsigned long) smb_buf
) % 2) {
933 decode_unicode_ssetup(&bcc_ptr
, bytes_remaining
, ses
, nls_cp
);
935 decode_ascii_ssetup(&bcc_ptr
, bytes_remaining
, ses
, nls_cp
);
940 key_invalidate(spnego_key
);
946 if (resp_buf_type
== CIFS_SMALL_BUFFER
) {
947 cifs_dbg(FYI
, "ssetup freeing small buf %p\n", iov
[0].iov_base
);
948 cifs_small_buf_release(iov
[0].iov_base
);
949 } else if (resp_buf_type
== CIFS_LARGE_BUFFER
)
950 cifs_buf_release(iov
[0].iov_base
);
952 /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
953 if ((phase
== NtLmChallenge
) && (rc
== 0))
954 goto ssetup_ntlmssp_authenticate
;