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");
333 ses
->flags
|= CIFS_SES_OS2
;
339 len
= strnlen(bcc_ptr
, bleft
);
343 kfree(ses
->serverNOS
);
345 ses
->serverNOS
= kzalloc(len
+ 1, GFP_KERNEL
);
347 strncpy(ses
->serverNOS
, bcc_ptr
, len
);
352 len
= strnlen(bcc_ptr
, bleft
);
356 /* No domain field in LANMAN case. Domain is
357 returned by old servers in the SMB negprot response */
358 /* BB For newer servers which do not support Unicode,
359 but thus do return domain here we could add parsing
360 for it later, but it is not very important */
361 cifs_dbg(FYI
, "ascii: bytes left %d\n", bleft
);
364 int decode_ntlmssp_challenge(char *bcc_ptr
, int blob_len
,
365 struct cifs_ses
*ses
)
367 unsigned int tioffset
; /* challenge message target info area */
368 unsigned int tilen
; /* challenge message target info area length */
370 CHALLENGE_MESSAGE
*pblob
= (CHALLENGE_MESSAGE
*)bcc_ptr
;
372 if (blob_len
< sizeof(CHALLENGE_MESSAGE
)) {
373 cifs_dbg(VFS
, "challenge blob len %d too small\n", blob_len
);
377 if (memcmp(pblob
->Signature
, "NTLMSSP", 8)) {
378 cifs_dbg(VFS
, "blob signature incorrect %s\n",
382 if (pblob
->MessageType
!= NtLmChallenge
) {
383 cifs_dbg(VFS
, "Incorrect message type %d\n",
388 memcpy(ses
->ntlmssp
->cryptkey
, pblob
->Challenge
, CIFS_CRYPTO_KEY_SIZE
);
389 /* BB we could decode pblob->NegotiateFlags; some may be useful */
390 /* In particular we can examine sign flags */
391 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
392 we must set the MIC field of the AUTHENTICATE_MESSAGE */
393 ses
->ntlmssp
->server_flags
= le32_to_cpu(pblob
->NegotiateFlags
);
394 tioffset
= le32_to_cpu(pblob
->TargetInfoArray
.BufferOffset
);
395 tilen
= le16_to_cpu(pblob
->TargetInfoArray
.Length
);
396 if (tioffset
> blob_len
|| tioffset
+ tilen
> blob_len
) {
397 cifs_dbg(VFS
, "tioffset + tilen too high %u + %u",
402 ses
->auth_key
.response
= kmemdup(bcc_ptr
+ tioffset
, tilen
,
404 if (!ses
->auth_key
.response
) {
405 cifs_dbg(VFS
, "Challenge target info alloc failure");
408 ses
->auth_key
.len
= tilen
;
414 /* BB Move to ntlmssp.c eventually */
416 /* We do not malloc the blob, it is passed in pbuffer, because
417 it is fixed size, and small, making this approach cleaner */
418 void build_ntlmssp_negotiate_blob(unsigned char *pbuffer
,
419 struct cifs_ses
*ses
)
421 NEGOTIATE_MESSAGE
*sec_blob
= (NEGOTIATE_MESSAGE
*)pbuffer
;
424 memset(pbuffer
, 0, sizeof(NEGOTIATE_MESSAGE
));
425 memcpy(sec_blob
->Signature
, NTLMSSP_SIGNATURE
, 8);
426 sec_blob
->MessageType
= NtLmNegotiate
;
428 /* BB is NTLMV2 session security format easier to use here? */
429 flags
= NTLMSSP_NEGOTIATE_56
| NTLMSSP_REQUEST_TARGET
|
430 NTLMSSP_NEGOTIATE_128
| NTLMSSP_NEGOTIATE_UNICODE
|
431 NTLMSSP_NEGOTIATE_NTLM
| NTLMSSP_NEGOTIATE_EXTENDED_SEC
;
432 if (ses
->server
->sec_mode
&
433 (SECMODE_SIGN_REQUIRED
| SECMODE_SIGN_ENABLED
)) {
434 flags
|= NTLMSSP_NEGOTIATE_SIGN
;
435 if (!ses
->server
->session_estab
)
436 flags
|= NTLMSSP_NEGOTIATE_KEY_XCH
;
439 sec_blob
->NegotiateFlags
= cpu_to_le32(flags
);
441 sec_blob
->WorkstationName
.BufferOffset
= 0;
442 sec_blob
->WorkstationName
.Length
= 0;
443 sec_blob
->WorkstationName
.MaximumLength
= 0;
445 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
446 sec_blob
->DomainName
.BufferOffset
= 0;
447 sec_blob
->DomainName
.Length
= 0;
448 sec_blob
->DomainName
.MaximumLength
= 0;
451 /* We do not malloc the blob, it is passed in pbuffer, because its
452 maximum possible size is fixed and small, making this approach cleaner.
453 This function returns the length of the data in the blob */
454 int build_ntlmssp_auth_blob(unsigned char *pbuffer
,
456 struct cifs_ses
*ses
,
457 const struct nls_table
*nls_cp
)
460 AUTHENTICATE_MESSAGE
*sec_blob
= (AUTHENTICATE_MESSAGE
*)pbuffer
;
464 memcpy(sec_blob
->Signature
, NTLMSSP_SIGNATURE
, 8);
465 sec_blob
->MessageType
= NtLmAuthenticate
;
467 flags
= NTLMSSP_NEGOTIATE_56
|
468 NTLMSSP_REQUEST_TARGET
| NTLMSSP_NEGOTIATE_TARGET_INFO
|
469 NTLMSSP_NEGOTIATE_128
| NTLMSSP_NEGOTIATE_UNICODE
|
470 NTLMSSP_NEGOTIATE_NTLM
| NTLMSSP_NEGOTIATE_EXTENDED_SEC
;
471 if (ses
->server
->sec_mode
&
472 (SECMODE_SIGN_REQUIRED
| SECMODE_SIGN_ENABLED
)) {
473 flags
|= NTLMSSP_NEGOTIATE_SIGN
;
474 if (!ses
->server
->session_estab
)
475 flags
|= NTLMSSP_NEGOTIATE_KEY_XCH
;
478 tmp
= pbuffer
+ sizeof(AUTHENTICATE_MESSAGE
);
479 sec_blob
->NegotiateFlags
= cpu_to_le32(flags
);
481 sec_blob
->LmChallengeResponse
.BufferOffset
=
482 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE
));
483 sec_blob
->LmChallengeResponse
.Length
= 0;
484 sec_blob
->LmChallengeResponse
.MaximumLength
= 0;
486 sec_blob
->NtChallengeResponse
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
487 rc
= setup_ntlmv2_rsp(ses
, nls_cp
);
489 cifs_dbg(VFS
, "Error %d during NTLMSSP authentication\n", rc
);
490 goto setup_ntlmv2_ret
;
492 memcpy(tmp
, ses
->auth_key
.response
+ CIFS_SESS_KEY_SIZE
,
493 ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
);
494 tmp
+= ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
;
496 sec_blob
->NtChallengeResponse
.Length
=
497 cpu_to_le16(ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
);
498 sec_blob
->NtChallengeResponse
.MaximumLength
=
499 cpu_to_le16(ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
);
501 if (ses
->domainName
== NULL
) {
502 sec_blob
->DomainName
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
503 sec_blob
->DomainName
.Length
= 0;
504 sec_blob
->DomainName
.MaximumLength
= 0;
508 len
= cifs_strtoUTF16((__le16
*)tmp
, ses
->domainName
,
509 MAX_USERNAME_SIZE
, nls_cp
);
510 len
*= 2; /* unicode is 2 bytes each */
511 sec_blob
->DomainName
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
512 sec_blob
->DomainName
.Length
= cpu_to_le16(len
);
513 sec_blob
->DomainName
.MaximumLength
= cpu_to_le16(len
);
517 if (ses
->user_name
== NULL
) {
518 sec_blob
->UserName
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
519 sec_blob
->UserName
.Length
= 0;
520 sec_blob
->UserName
.MaximumLength
= 0;
524 len
= cifs_strtoUTF16((__le16
*)tmp
, ses
->user_name
,
525 MAX_USERNAME_SIZE
, nls_cp
);
526 len
*= 2; /* unicode is 2 bytes each */
527 sec_blob
->UserName
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
528 sec_blob
->UserName
.Length
= cpu_to_le16(len
);
529 sec_blob
->UserName
.MaximumLength
= cpu_to_le16(len
);
533 sec_blob
->WorkstationName
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
534 sec_blob
->WorkstationName
.Length
= 0;
535 sec_blob
->WorkstationName
.MaximumLength
= 0;
538 if (((ses
->ntlmssp
->server_flags
& NTLMSSP_NEGOTIATE_KEY_XCH
) ||
539 (ses
->ntlmssp
->server_flags
& NTLMSSP_NEGOTIATE_EXTENDED_SEC
))
540 && !calc_seckey(ses
)) {
541 memcpy(tmp
, ses
->ntlmssp
->ciphertext
, CIFS_CPHTXT_SIZE
);
542 sec_blob
->SessionKey
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
543 sec_blob
->SessionKey
.Length
= cpu_to_le16(CIFS_CPHTXT_SIZE
);
544 sec_blob
->SessionKey
.MaximumLength
=
545 cpu_to_le16(CIFS_CPHTXT_SIZE
);
546 tmp
+= CIFS_CPHTXT_SIZE
;
548 sec_blob
->SessionKey
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
549 sec_blob
->SessionKey
.Length
= 0;
550 sec_blob
->SessionKey
.MaximumLength
= 0;
554 *buflen
= tmp
- pbuffer
;
559 CIFS_SessSetup(const unsigned int xid
, struct cifs_ses
*ses
,
560 const struct nls_table
*nls_cp
)
564 struct smb_hdr
*smb_buf
;
567 SESSION_SETUP_ANDX
*pSMB
;
572 enum securityEnum type
;
573 __u16 action
, bytes_remaining
;
574 struct key
*spnego_key
= NULL
;
575 __le32 phase
= NtLmNegotiate
; /* NTLMSSP, if needed, is multistage */
577 char *ntlmsspblob
= NULL
;
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 ses
->flags
&= ~CIFS_SES_LANMAN
;
645 iov
[1].iov_base
= NULL
;
648 if (type
== LANMAN
) {
649 #ifdef CONFIG_CIFS_WEAK_PW_HASH
650 char lnm_session_key
[CIFS_AUTH_RESP_SIZE
];
652 pSMB
->req
.hdr
.Flags2
&= ~SMBFLG2_UNICODE
;
654 /* no capabilities flags in old lanman negotiation */
656 pSMB
->old_req
.PasswordLength
= cpu_to_le16(CIFS_AUTH_RESP_SIZE
);
658 /* Calculate hash with password and copy into bcc_ptr.
659 * Encryption Key (stored as in cryptkey) gets used if the
660 * security mode bit in Negottiate Protocol response states
661 * to use challenge/response method (i.e. Password bit is 1).
664 rc
= calc_lanman_hash(ses
->password
, ses
->server
->cryptkey
,
665 ses
->server
->sec_mode
& SECMODE_PW_ENCRYPT
?
666 true : false, lnm_session_key
);
668 ses
->flags
|= CIFS_SES_LANMAN
;
669 memcpy(bcc_ptr
, (char *)lnm_session_key
, CIFS_AUTH_RESP_SIZE
);
670 bcc_ptr
+= CIFS_AUTH_RESP_SIZE
;
672 /* can not sign if LANMAN negotiated so no need
673 to calculate signing key? but what if server
674 changed to do higher than lanman dialect and
675 we reconnected would we ever calc signing_key? */
677 cifs_dbg(FYI
, "Negotiating LANMAN setting up strings\n");
678 /* Unicode not allowed for LANMAN dialects */
679 ascii_ssetup_strings(&bcc_ptr
, ses
, nls_cp
);
681 } else if (type
== NTLM
) {
682 pSMB
->req_no_secext
.Capabilities
= cpu_to_le32(capabilities
);
683 pSMB
->req_no_secext
.CaseInsensitivePasswordLength
=
684 cpu_to_le16(CIFS_AUTH_RESP_SIZE
);
685 pSMB
->req_no_secext
.CaseSensitivePasswordLength
=
686 cpu_to_le16(CIFS_AUTH_RESP_SIZE
);
688 /* calculate ntlm response and session key */
689 rc
= setup_ntlm_response(ses
, nls_cp
);
691 cifs_dbg(VFS
, "Error %d during NTLM authentication\n",
696 /* copy ntlm response */
697 memcpy(bcc_ptr
, ses
->auth_key
.response
+ CIFS_SESS_KEY_SIZE
,
698 CIFS_AUTH_RESP_SIZE
);
699 bcc_ptr
+= CIFS_AUTH_RESP_SIZE
;
700 memcpy(bcc_ptr
, ses
->auth_key
.response
+ CIFS_SESS_KEY_SIZE
,
701 CIFS_AUTH_RESP_SIZE
);
702 bcc_ptr
+= CIFS_AUTH_RESP_SIZE
;
704 if (ses
->capabilities
& CAP_UNICODE
) {
705 /* unicode strings must be word aligned */
706 if (iov
[0].iov_len
% 2) {
710 unicode_ssetup_strings(&bcc_ptr
, ses
, nls_cp
);
712 ascii_ssetup_strings(&bcc_ptr
, ses
, nls_cp
);
713 } else if (type
== NTLMv2
) {
714 pSMB
->req_no_secext
.Capabilities
= cpu_to_le32(capabilities
);
716 /* LM2 password would be here if we supported it */
717 pSMB
->req_no_secext
.CaseInsensitivePasswordLength
= 0;
719 /* calculate nlmv2 response and session key */
720 rc
= setup_ntlmv2_rsp(ses
, nls_cp
);
722 cifs_dbg(VFS
, "Error %d during NTLMv2 authentication\n",
726 memcpy(bcc_ptr
, ses
->auth_key
.response
+ CIFS_SESS_KEY_SIZE
,
727 ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
);
728 bcc_ptr
+= ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
;
730 /* set case sensitive password length after tilen may get
731 * assigned, tilen is 0 otherwise.
733 pSMB
->req_no_secext
.CaseSensitivePasswordLength
=
734 cpu_to_le16(ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
);
736 if (ses
->capabilities
& CAP_UNICODE
) {
737 if (iov
[0].iov_len
% 2) {
741 unicode_ssetup_strings(&bcc_ptr
, ses
, nls_cp
);
743 ascii_ssetup_strings(&bcc_ptr
, ses
, nls_cp
);
744 } else if (type
== Kerberos
) {
745 #ifdef CONFIG_CIFS_UPCALL
746 struct cifs_spnego_msg
*msg
;
748 spnego_key
= cifs_get_spnego_key(ses
);
749 if (IS_ERR(spnego_key
)) {
750 rc
= PTR_ERR(spnego_key
);
755 msg
= spnego_key
->payload
.data
;
756 /* check version field to make sure that cifs.upcall is
757 sending us a response in an expected form */
758 if (msg
->version
!= CIFS_SPNEGO_UPCALL_VERSION
) {
759 cifs_dbg(VFS
, "incorrect version of cifs.upcall "
760 "expected %d but got %d)",
761 CIFS_SPNEGO_UPCALL_VERSION
, msg
->version
);
766 ses
->auth_key
.response
= kmemdup(msg
->data
, msg
->sesskey_len
,
768 if (!ses
->auth_key
.response
) {
769 cifs_dbg(VFS
, "Kerberos can't allocate (%u bytes) memory",
774 ses
->auth_key
.len
= msg
->sesskey_len
;
776 pSMB
->req
.hdr
.Flags2
|= SMBFLG2_EXT_SEC
;
777 capabilities
|= CAP_EXTENDED_SECURITY
;
778 pSMB
->req
.Capabilities
= cpu_to_le32(capabilities
);
779 iov
[1].iov_base
= msg
->data
+ msg
->sesskey_len
;
780 iov
[1].iov_len
= msg
->secblob_len
;
781 pSMB
->req
.SecurityBlobLength
= cpu_to_le16(iov
[1].iov_len
);
783 if (ses
->capabilities
& CAP_UNICODE
) {
784 /* unicode strings must be word aligned */
785 if ((iov
[0].iov_len
+ iov
[1].iov_len
) % 2) {
789 unicode_oslm_strings(&bcc_ptr
, nls_cp
);
790 unicode_domain_string(&bcc_ptr
, ses
, nls_cp
);
792 /* BB: is this right? */
793 ascii_ssetup_strings(&bcc_ptr
, ses
, nls_cp
);
794 #else /* ! CONFIG_CIFS_UPCALL */
795 cifs_dbg(VFS
, "Kerberos negotiated but upcall support disabled!\n");
798 #endif /* CONFIG_CIFS_UPCALL */
799 } else if (type
== RawNTLMSSP
) {
800 if ((pSMB
->req
.hdr
.Flags2
& SMBFLG2_UNICODE
) == 0) {
801 cifs_dbg(VFS
, "NTLMSSP requires Unicode support\n");
806 cifs_dbg(FYI
, "ntlmssp session setup phase %d\n", phase
);
807 pSMB
->req
.hdr
.Flags2
|= SMBFLG2_EXT_SEC
;
808 capabilities
|= CAP_EXTENDED_SECURITY
;
809 pSMB
->req
.Capabilities
|= cpu_to_le32(capabilities
);
812 build_ntlmssp_negotiate_blob(
813 pSMB
->req
.SecurityBlob
, ses
);
814 iov
[1].iov_len
= sizeof(NEGOTIATE_MESSAGE
);
815 iov
[1].iov_base
= pSMB
->req
.SecurityBlob
;
816 pSMB
->req
.SecurityBlobLength
=
817 cpu_to_le16(sizeof(NEGOTIATE_MESSAGE
));
819 case NtLmAuthenticate
:
821 * 5 is an empirical value, large enough to hold
822 * authenticate message plus max 10 of av paris,
823 * domain, user, workstation names, flags, etc.
825 ntlmsspblob
= kzalloc(
826 5*sizeof(struct _AUTHENTICATE_MESSAGE
),
833 rc
= build_ntlmssp_auth_blob(ntlmsspblob
,
834 &blob_len
, ses
, nls_cp
);
837 iov
[1].iov_len
= blob_len
;
838 iov
[1].iov_base
= ntlmsspblob
;
839 pSMB
->req
.SecurityBlobLength
= cpu_to_le16(blob_len
);
841 * Make sure that we tell the server that we are using
842 * the uid that it just gave us back on the response
845 smb_buf
->Uid
= ses
->Suid
;
848 cifs_dbg(VFS
, "invalid phase %d\n", phase
);
852 /* unicode strings must be word aligned */
853 if ((iov
[0].iov_len
+ iov
[1].iov_len
) % 2) {
857 unicode_oslm_strings(&bcc_ptr
, nls_cp
);
859 cifs_dbg(VFS
, "secType %d not supported!\n", type
);
864 iov
[2].iov_base
= str_area
;
865 iov
[2].iov_len
= (long) bcc_ptr
- (long) str_area
;
867 count
= iov
[1].iov_len
+ iov
[2].iov_len
;
868 smb_buf
->smb_buf_length
=
869 cpu_to_be32(be32_to_cpu(smb_buf
->smb_buf_length
) + count
);
871 put_bcc(count
, smb_buf
);
873 rc
= SendReceive2(xid
, ses
, iov
, 3 /* num_iovecs */, &resp_buf_type
,
875 /* SMB request buf freed in SendReceive2 */
877 pSMB
= (SESSION_SETUP_ANDX
*)iov
[0].iov_base
;
878 smb_buf
= (struct smb_hdr
*)iov
[0].iov_base
;
880 if ((type
== RawNTLMSSP
) && (resp_buf_type
!= CIFS_NO_BUFFER
) &&
881 (smb_buf
->Status
.CifsError
==
882 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED
))) {
883 if (phase
!= NtLmNegotiate
) {
884 cifs_dbg(VFS
, "Unexpected more processing error\n");
887 /* NTLMSSP Negotiate sent now processing challenge (response) */
888 phase
= NtLmChallenge
; /* process ntlmssp challenge */
889 rc
= 0; /* MORE_PROC rc is not an error here, but expected */
894 if ((smb_buf
->WordCount
!= 3) && (smb_buf
->WordCount
!= 4)) {
896 cifs_dbg(VFS
, "bad word count %d\n", smb_buf
->WordCount
);
899 action
= le16_to_cpu(pSMB
->resp
.Action
);
900 if (action
& GUEST_LOGIN
)
901 cifs_dbg(FYI
, "Guest login\n"); /* BB mark SesInfo struct? */
902 ses
->Suid
= smb_buf
->Uid
; /* UID left in wire format (le) */
903 cifs_dbg(FYI
, "UID = %llu\n", ses
->Suid
);
904 /* response can have either 3 or 4 word count - Samba sends 3 */
905 /* and lanman response is 3 */
906 bytes_remaining
= get_bcc(smb_buf
);
907 bcc_ptr
= pByteArea(smb_buf
);
909 if (smb_buf
->WordCount
== 4) {
910 blob_len
= le16_to_cpu(pSMB
->resp
.SecurityBlobLength
);
911 if (blob_len
> bytes_remaining
) {
912 cifs_dbg(VFS
, "bad security blob length %d\n",
917 if (phase
== NtLmChallenge
) {
918 rc
= decode_ntlmssp_challenge(bcc_ptr
, blob_len
, ses
);
919 /* now goto beginning for ntlmssp authenticate phase */
924 bytes_remaining
-= blob_len
;
927 /* BB check if Unicode and decode strings */
928 if (bytes_remaining
== 0) {
929 /* no string area to decode, do nothing */
930 } else if (smb_buf
->Flags2
& SMBFLG2_UNICODE
) {
931 /* unicode string area must be word-aligned */
932 if (((unsigned long) bcc_ptr
- (unsigned long) smb_buf
) % 2) {
936 decode_unicode_ssetup(&bcc_ptr
, bytes_remaining
, ses
, nls_cp
);
938 decode_ascii_ssetup(&bcc_ptr
, bytes_remaining
, ses
, nls_cp
);
943 key_invalidate(spnego_key
);
949 if (resp_buf_type
== CIFS_SMALL_BUFFER
) {
950 cifs_dbg(FYI
, "ssetup freeing small buf %p\n", iov
[0].iov_base
);
951 cifs_small_buf_release(iov
[0].iov_base
);
952 } else if (resp_buf_type
== CIFS_LARGE_BUFFER
)
953 cifs_buf_release(iov
[0].iov_base
);
955 /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
956 if ((phase
== NtLmChallenge
) && (rc
== 0))
957 goto ssetup_ntlmssp_authenticate
;