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
,
201 CIFS_MAX_DOMAINNAME_LEN
, nls_cp
);
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
, CIFS_MAX_DOMAINNAME_LEN
);
260 bcc_ptr
+= strnlen(ses
->domainName
, CIFS_MAX_DOMAINNAME_LEN
);
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 int decode_ascii_ssetup(char **pbcc_area
, __u16 bleft
,
314 struct cifs_ses
*ses
,
315 const struct nls_table
*nls_cp
)
319 char *bcc_ptr
= *pbcc_area
;
321 cifs_dbg(FYI
, "decode sessetup ascii. bleft %d\n", bleft
);
323 len
= strnlen(bcc_ptr
, bleft
);
327 kfree(ses
->serverOS
);
329 ses
->serverOS
= kzalloc(len
+ 1, GFP_KERNEL
);
331 strncpy(ses
->serverOS
, bcc_ptr
, len
);
332 if (strncmp(ses
->serverOS
, "OS/2", 4) == 0) {
333 cifs_dbg(FYI
, "OS/2 server\n");
334 ses
->flags
|= CIFS_SES_OS2
;
340 len
= strnlen(bcc_ptr
, bleft
);
344 kfree(ses
->serverNOS
);
346 ses
->serverNOS
= kzalloc(len
+ 1, GFP_KERNEL
);
348 strncpy(ses
->serverNOS
, bcc_ptr
, len
);
353 len
= strnlen(bcc_ptr
, bleft
);
357 /* No domain field in LANMAN case. Domain is
358 returned by old servers in the SMB negprot response */
359 /* BB For newer servers which do not support Unicode,
360 but thus do return domain here we could add parsing
361 for it later, but it is not very important */
362 cifs_dbg(FYI
, "ascii: bytes left %d\n", bleft
);
367 int decode_ntlmssp_challenge(char *bcc_ptr
, int blob_len
,
368 struct cifs_ses
*ses
)
370 unsigned int tioffset
; /* challenge message target info area */
371 unsigned int tilen
; /* challenge message target info area length */
373 CHALLENGE_MESSAGE
*pblob
= (CHALLENGE_MESSAGE
*)bcc_ptr
;
375 if (blob_len
< sizeof(CHALLENGE_MESSAGE
)) {
376 cifs_dbg(VFS
, "challenge blob len %d too small\n", blob_len
);
380 if (memcmp(pblob
->Signature
, "NTLMSSP", 8)) {
381 cifs_dbg(VFS
, "blob signature incorrect %s\n",
385 if (pblob
->MessageType
!= NtLmChallenge
) {
386 cifs_dbg(VFS
, "Incorrect message type %d\n",
391 memcpy(ses
->ntlmssp
->cryptkey
, pblob
->Challenge
, CIFS_CRYPTO_KEY_SIZE
);
392 /* BB we could decode pblob->NegotiateFlags; some may be useful */
393 /* In particular we can examine sign flags */
394 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
395 we must set the MIC field of the AUTHENTICATE_MESSAGE */
396 ses
->ntlmssp
->server_flags
= le32_to_cpu(pblob
->NegotiateFlags
);
397 tioffset
= le32_to_cpu(pblob
->TargetInfoArray
.BufferOffset
);
398 tilen
= le16_to_cpu(pblob
->TargetInfoArray
.Length
);
399 if (tioffset
> blob_len
|| tioffset
+ tilen
> blob_len
) {
400 cifs_dbg(VFS
, "tioffset + tilen too high %u + %u",
405 ses
->auth_key
.response
= kmemdup(bcc_ptr
+ tioffset
, tilen
,
407 if (!ses
->auth_key
.response
) {
408 cifs_dbg(VFS
, "Challenge target info alloc failure");
411 ses
->auth_key
.len
= tilen
;
417 /* BB Move to ntlmssp.c eventually */
419 /* We do not malloc the blob, it is passed in pbuffer, because
420 it is fixed size, and small, making this approach cleaner */
421 void build_ntlmssp_negotiate_blob(unsigned char *pbuffer
,
422 struct cifs_ses
*ses
)
424 NEGOTIATE_MESSAGE
*sec_blob
= (NEGOTIATE_MESSAGE
*)pbuffer
;
427 memset(pbuffer
, 0, sizeof(NEGOTIATE_MESSAGE
));
428 memcpy(sec_blob
->Signature
, NTLMSSP_SIGNATURE
, 8);
429 sec_blob
->MessageType
= NtLmNegotiate
;
431 /* BB is NTLMV2 session security format easier to use here? */
432 flags
= NTLMSSP_NEGOTIATE_56
| NTLMSSP_REQUEST_TARGET
|
433 NTLMSSP_NEGOTIATE_128
| NTLMSSP_NEGOTIATE_UNICODE
|
434 NTLMSSP_NEGOTIATE_NTLM
| NTLMSSP_NEGOTIATE_EXTENDED_SEC
;
435 if (ses
->server
->sec_mode
&
436 (SECMODE_SIGN_REQUIRED
| SECMODE_SIGN_ENABLED
)) {
437 flags
|= NTLMSSP_NEGOTIATE_SIGN
;
438 if (!ses
->server
->session_estab
)
439 flags
|= NTLMSSP_NEGOTIATE_KEY_XCH
;
442 sec_blob
->NegotiateFlags
= cpu_to_le32(flags
);
444 sec_blob
->WorkstationName
.BufferOffset
= 0;
445 sec_blob
->WorkstationName
.Length
= 0;
446 sec_blob
->WorkstationName
.MaximumLength
= 0;
448 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
449 sec_blob
->DomainName
.BufferOffset
= 0;
450 sec_blob
->DomainName
.Length
= 0;
451 sec_blob
->DomainName
.MaximumLength
= 0;
454 /* We do not malloc the blob, it is passed in pbuffer, because its
455 maximum possible size is fixed and small, making this approach cleaner.
456 This function returns the length of the data in the blob */
457 int build_ntlmssp_auth_blob(unsigned char *pbuffer
,
459 struct cifs_ses
*ses
,
460 const struct nls_table
*nls_cp
)
463 AUTHENTICATE_MESSAGE
*sec_blob
= (AUTHENTICATE_MESSAGE
*)pbuffer
;
467 memcpy(sec_blob
->Signature
, NTLMSSP_SIGNATURE
, 8);
468 sec_blob
->MessageType
= NtLmAuthenticate
;
470 flags
= NTLMSSP_NEGOTIATE_56
|
471 NTLMSSP_REQUEST_TARGET
| NTLMSSP_NEGOTIATE_TARGET_INFO
|
472 NTLMSSP_NEGOTIATE_128
| NTLMSSP_NEGOTIATE_UNICODE
|
473 NTLMSSP_NEGOTIATE_NTLM
| NTLMSSP_NEGOTIATE_EXTENDED_SEC
;
474 if (ses
->server
->sec_mode
&
475 (SECMODE_SIGN_REQUIRED
| SECMODE_SIGN_ENABLED
)) {
476 flags
|= NTLMSSP_NEGOTIATE_SIGN
;
477 if (!ses
->server
->session_estab
)
478 flags
|= NTLMSSP_NEGOTIATE_KEY_XCH
;
481 tmp
= pbuffer
+ sizeof(AUTHENTICATE_MESSAGE
);
482 sec_blob
->NegotiateFlags
= cpu_to_le32(flags
);
484 sec_blob
->LmChallengeResponse
.BufferOffset
=
485 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE
));
486 sec_blob
->LmChallengeResponse
.Length
= 0;
487 sec_blob
->LmChallengeResponse
.MaximumLength
= 0;
489 sec_blob
->NtChallengeResponse
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
490 if (ses
->user_name
!= NULL
) {
491 rc
= setup_ntlmv2_rsp(ses
, nls_cp
);
493 cifs_dbg(VFS
, "Error %d during NTLMSSP authentication\n", rc
);
494 goto setup_ntlmv2_ret
;
496 memcpy(tmp
, ses
->auth_key
.response
+ CIFS_SESS_KEY_SIZE
,
497 ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
);
498 tmp
+= ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
;
500 sec_blob
->NtChallengeResponse
.Length
=
501 cpu_to_le16(ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
);
502 sec_blob
->NtChallengeResponse
.MaximumLength
=
503 cpu_to_le16(ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
);
506 * don't send an NT Response for anonymous access
508 sec_blob
->NtChallengeResponse
.Length
= 0;
509 sec_blob
->NtChallengeResponse
.MaximumLength
= 0;
512 if (ses
->domainName
== NULL
) {
513 sec_blob
->DomainName
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
514 sec_blob
->DomainName
.Length
= 0;
515 sec_blob
->DomainName
.MaximumLength
= 0;
519 len
= cifs_strtoUTF16((__le16
*)tmp
, ses
->domainName
,
520 MAX_USERNAME_SIZE
, nls_cp
);
521 len
*= 2; /* unicode is 2 bytes each */
522 sec_blob
->DomainName
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
523 sec_blob
->DomainName
.Length
= cpu_to_le16(len
);
524 sec_blob
->DomainName
.MaximumLength
= cpu_to_le16(len
);
528 if (ses
->user_name
== NULL
) {
529 sec_blob
->UserName
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
530 sec_blob
->UserName
.Length
= 0;
531 sec_blob
->UserName
.MaximumLength
= 0;
535 len
= cifs_strtoUTF16((__le16
*)tmp
, ses
->user_name
,
536 MAX_USERNAME_SIZE
, nls_cp
);
537 len
*= 2; /* unicode is 2 bytes each */
538 sec_blob
->UserName
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
539 sec_blob
->UserName
.Length
= cpu_to_le16(len
);
540 sec_blob
->UserName
.MaximumLength
= cpu_to_le16(len
);
544 sec_blob
->WorkstationName
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
545 sec_blob
->WorkstationName
.Length
= 0;
546 sec_blob
->WorkstationName
.MaximumLength
= 0;
549 if (((ses
->ntlmssp
->server_flags
& NTLMSSP_NEGOTIATE_KEY_XCH
) ||
550 (ses
->ntlmssp
->server_flags
& NTLMSSP_NEGOTIATE_EXTENDED_SEC
))
551 && !calc_seckey(ses
)) {
552 memcpy(tmp
, ses
->ntlmssp
->ciphertext
, CIFS_CPHTXT_SIZE
);
553 sec_blob
->SessionKey
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
554 sec_blob
->SessionKey
.Length
= cpu_to_le16(CIFS_CPHTXT_SIZE
);
555 sec_blob
->SessionKey
.MaximumLength
=
556 cpu_to_le16(CIFS_CPHTXT_SIZE
);
557 tmp
+= CIFS_CPHTXT_SIZE
;
559 sec_blob
->SessionKey
.BufferOffset
= cpu_to_le32(tmp
- pbuffer
);
560 sec_blob
->SessionKey
.Length
= 0;
561 sec_blob
->SessionKey
.MaximumLength
= 0;
565 *buflen
= tmp
- pbuffer
;
570 CIFS_SessSetup(const unsigned int xid
, struct cifs_ses
*ses
,
571 const struct nls_table
*nls_cp
)
575 struct smb_hdr
*smb_buf
;
578 SESSION_SETUP_ANDX
*pSMB
;
583 enum securityEnum type
;
584 __u16 action
, bytes_remaining
;
585 struct key
*spnego_key
= NULL
;
586 __le32 phase
= NtLmNegotiate
; /* NTLMSSP, if needed, is multistage */
588 char *ntlmsspblob
= NULL
;
593 type
= ses
->server
->secType
;
594 cifs_dbg(FYI
, "sess setup type %d\n", type
);
595 if (type
== RawNTLMSSP
) {
596 /* if memory allocation is successful, caller of this function
599 ses
->ntlmssp
= kmalloc(sizeof(struct ntlmssp_auth
), GFP_KERNEL
);
604 ssetup_ntlmssp_authenticate
:
605 if (phase
== NtLmChallenge
)
606 phase
= NtLmAuthenticate
; /* if ntlmssp, now final phase */
608 if (type
== LANMAN
) {
609 #ifndef CONFIG_CIFS_WEAK_PW_HASH
610 /* LANMAN and plaintext are less secure and off by default.
611 So we make this explicitly be turned on in kconfig (in the
612 build) and turned on at runtime (changed from the default)
613 in proc/fs/cifs or via mount parm. Unfortunately this is
614 needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
617 wct
= 10; /* lanman 2 style sessionsetup */
618 } else if ((type
== NTLM
) || (type
== NTLMv2
)) {
619 /* For NTLMv2 failures eventually may need to retry NTLM */
620 wct
= 13; /* old style NTLM sessionsetup */
621 } else /* same size: negotiate or auth, NTLMSSP or extended security */
624 rc
= small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX
, wct
, ses
,
629 pSMB
= (SESSION_SETUP_ANDX
*)smb_buf
;
631 capabilities
= cifs_ssetup_hdr(ses
, pSMB
);
633 /* we will send the SMB in three pieces:
634 a fixed length beginning part, an optional
635 SPNEGO blob (which can be zero length), and a
636 last part which will include the strings
637 and rest of bcc area. This allows us to avoid
638 a large buffer 17K allocation */
639 iov
[0].iov_base
= (char *)pSMB
;
640 iov
[0].iov_len
= be32_to_cpu(smb_buf
->smb_buf_length
) + 4;
642 /* setting this here allows the code at the end of the function
643 to free the request buffer if there's an error */
644 resp_buf_type
= CIFS_SMALL_BUFFER
;
646 /* 2000 big enough to fit max user, domain, NOS name etc. */
647 str_area
= kmalloc(2000, GFP_KERNEL
);
648 if (str_area
== NULL
) {
654 ses
->flags
&= ~CIFS_SES_LANMAN
;
656 iov
[1].iov_base
= NULL
;
659 if (type
== LANMAN
) {
660 #ifdef CONFIG_CIFS_WEAK_PW_HASH
661 char lnm_session_key
[CIFS_AUTH_RESP_SIZE
];
663 pSMB
->req
.hdr
.Flags2
&= ~SMBFLG2_UNICODE
;
665 /* no capabilities flags in old lanman negotiation */
667 pSMB
->old_req
.PasswordLength
= cpu_to_le16(CIFS_AUTH_RESP_SIZE
);
669 /* Calculate hash with password and copy into bcc_ptr.
670 * Encryption Key (stored as in cryptkey) gets used if the
671 * security mode bit in Negottiate Protocol response states
672 * to use challenge/response method (i.e. Password bit is 1).
675 rc
= calc_lanman_hash(ses
->password
, ses
->server
->cryptkey
,
676 ses
->server
->sec_mode
& SECMODE_PW_ENCRYPT
?
677 true : false, lnm_session_key
);
679 ses
->flags
|= CIFS_SES_LANMAN
;
680 memcpy(bcc_ptr
, (char *)lnm_session_key
, CIFS_AUTH_RESP_SIZE
);
681 bcc_ptr
+= CIFS_AUTH_RESP_SIZE
;
683 /* can not sign if LANMAN negotiated so no need
684 to calculate signing key? but what if server
685 changed to do higher than lanman dialect and
686 we reconnected would we ever calc signing_key? */
688 cifs_dbg(FYI
, "Negotiating LANMAN setting up strings\n");
689 /* Unicode not allowed for LANMAN dialects */
690 ascii_ssetup_strings(&bcc_ptr
, ses
, nls_cp
);
692 } else if (type
== NTLM
) {
693 pSMB
->req_no_secext
.Capabilities
= cpu_to_le32(capabilities
);
694 pSMB
->req_no_secext
.CaseInsensitivePasswordLength
=
695 cpu_to_le16(CIFS_AUTH_RESP_SIZE
);
696 pSMB
->req_no_secext
.CaseSensitivePasswordLength
=
697 cpu_to_le16(CIFS_AUTH_RESP_SIZE
);
699 /* calculate ntlm response and session key */
700 rc
= setup_ntlm_response(ses
, nls_cp
);
702 cifs_dbg(VFS
, "Error %d during NTLM authentication\n",
707 /* copy ntlm response */
708 memcpy(bcc_ptr
, ses
->auth_key
.response
+ CIFS_SESS_KEY_SIZE
,
709 CIFS_AUTH_RESP_SIZE
);
710 bcc_ptr
+= CIFS_AUTH_RESP_SIZE
;
711 memcpy(bcc_ptr
, ses
->auth_key
.response
+ CIFS_SESS_KEY_SIZE
,
712 CIFS_AUTH_RESP_SIZE
);
713 bcc_ptr
+= CIFS_AUTH_RESP_SIZE
;
715 if (ses
->capabilities
& CAP_UNICODE
) {
716 /* unicode strings must be word aligned */
717 if (iov
[0].iov_len
% 2) {
721 unicode_ssetup_strings(&bcc_ptr
, ses
, nls_cp
);
723 ascii_ssetup_strings(&bcc_ptr
, ses
, nls_cp
);
724 } else if (type
== NTLMv2
) {
725 pSMB
->req_no_secext
.Capabilities
= cpu_to_le32(capabilities
);
727 /* LM2 password would be here if we supported it */
728 pSMB
->req_no_secext
.CaseInsensitivePasswordLength
= 0;
730 /* calculate nlmv2 response and session key */
731 rc
= setup_ntlmv2_rsp(ses
, nls_cp
);
733 cifs_dbg(VFS
, "Error %d during NTLMv2 authentication\n",
737 memcpy(bcc_ptr
, ses
->auth_key
.response
+ CIFS_SESS_KEY_SIZE
,
738 ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
);
739 bcc_ptr
+= ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
;
741 /* set case sensitive password length after tilen may get
742 * assigned, tilen is 0 otherwise.
744 pSMB
->req_no_secext
.CaseSensitivePasswordLength
=
745 cpu_to_le16(ses
->auth_key
.len
- CIFS_SESS_KEY_SIZE
);
747 if (ses
->capabilities
& CAP_UNICODE
) {
748 if (iov
[0].iov_len
% 2) {
752 unicode_ssetup_strings(&bcc_ptr
, ses
, nls_cp
);
754 ascii_ssetup_strings(&bcc_ptr
, ses
, nls_cp
);
755 } else if (type
== Kerberos
) {
756 #ifdef CONFIG_CIFS_UPCALL
757 struct cifs_spnego_msg
*msg
;
759 spnego_key
= cifs_get_spnego_key(ses
);
760 if (IS_ERR(spnego_key
)) {
761 rc
= PTR_ERR(spnego_key
);
766 msg
= spnego_key
->payload
.data
;
767 /* check version field to make sure that cifs.upcall is
768 sending us a response in an expected form */
769 if (msg
->version
!= CIFS_SPNEGO_UPCALL_VERSION
) {
770 cifs_dbg(VFS
, "incorrect version of cifs.upcall "
771 "expected %d but got %d)",
772 CIFS_SPNEGO_UPCALL_VERSION
, msg
->version
);
777 ses
->auth_key
.response
= kmemdup(msg
->data
, msg
->sesskey_len
,
779 if (!ses
->auth_key
.response
) {
780 cifs_dbg(VFS
, "Kerberos can't allocate (%u bytes) memory",
785 ses
->auth_key
.len
= msg
->sesskey_len
;
787 pSMB
->req
.hdr
.Flags2
|= SMBFLG2_EXT_SEC
;
788 capabilities
|= CAP_EXTENDED_SECURITY
;
789 pSMB
->req
.Capabilities
= cpu_to_le32(capabilities
);
790 iov
[1].iov_base
= msg
->data
+ msg
->sesskey_len
;
791 iov
[1].iov_len
= msg
->secblob_len
;
792 pSMB
->req
.SecurityBlobLength
= cpu_to_le16(iov
[1].iov_len
);
794 if (ses
->capabilities
& CAP_UNICODE
) {
795 /* unicode strings must be word aligned */
796 if ((iov
[0].iov_len
+ iov
[1].iov_len
) % 2) {
800 unicode_oslm_strings(&bcc_ptr
, nls_cp
);
801 unicode_domain_string(&bcc_ptr
, ses
, nls_cp
);
803 /* BB: is this right? */
804 ascii_ssetup_strings(&bcc_ptr
, ses
, nls_cp
);
805 #else /* ! CONFIG_CIFS_UPCALL */
806 cifs_dbg(VFS
, "Kerberos negotiated but upcall support disabled!\n");
809 #endif /* CONFIG_CIFS_UPCALL */
810 } else if (type
== RawNTLMSSP
) {
811 if ((pSMB
->req
.hdr
.Flags2
& SMBFLG2_UNICODE
) == 0) {
812 cifs_dbg(VFS
, "NTLMSSP requires Unicode support\n");
817 cifs_dbg(FYI
, "ntlmssp session setup phase %d\n", phase
);
818 pSMB
->req
.hdr
.Flags2
|= SMBFLG2_EXT_SEC
;
819 capabilities
|= CAP_EXTENDED_SECURITY
;
820 pSMB
->req
.Capabilities
|= cpu_to_le32(capabilities
);
823 build_ntlmssp_negotiate_blob(
824 pSMB
->req
.SecurityBlob
, ses
);
825 iov
[1].iov_len
= sizeof(NEGOTIATE_MESSAGE
);
826 iov
[1].iov_base
= pSMB
->req
.SecurityBlob
;
827 pSMB
->req
.SecurityBlobLength
=
828 cpu_to_le16(sizeof(NEGOTIATE_MESSAGE
));
830 case NtLmAuthenticate
:
832 * 5 is an empirical value, large enough to hold
833 * authenticate message plus max 10 of av paris,
834 * domain, user, workstation names, flags, etc.
836 ntlmsspblob
= kzalloc(
837 5*sizeof(struct _AUTHENTICATE_MESSAGE
),
844 rc
= build_ntlmssp_auth_blob(ntlmsspblob
,
845 &blob_len
, ses
, nls_cp
);
848 iov
[1].iov_len
= blob_len
;
849 iov
[1].iov_base
= ntlmsspblob
;
850 pSMB
->req
.SecurityBlobLength
= cpu_to_le16(blob_len
);
852 * Make sure that we tell the server that we are using
853 * the uid that it just gave us back on the response
856 smb_buf
->Uid
= ses
->Suid
;
859 cifs_dbg(VFS
, "invalid phase %d\n", phase
);
863 /* unicode strings must be word aligned */
864 if ((iov
[0].iov_len
+ iov
[1].iov_len
) % 2) {
868 unicode_oslm_strings(&bcc_ptr
, nls_cp
);
870 cifs_dbg(VFS
, "secType %d not supported!\n", type
);
875 iov
[2].iov_base
= str_area
;
876 iov
[2].iov_len
= (long) bcc_ptr
- (long) str_area
;
878 count
= iov
[1].iov_len
+ iov
[2].iov_len
;
879 smb_buf
->smb_buf_length
=
880 cpu_to_be32(be32_to_cpu(smb_buf
->smb_buf_length
) + count
);
882 put_bcc(count
, smb_buf
);
884 rc
= SendReceive2(xid
, ses
, iov
, 3 /* num_iovecs */, &resp_buf_type
,
886 /* SMB request buf freed in SendReceive2 */
888 pSMB
= (SESSION_SETUP_ANDX
*)iov
[0].iov_base
;
889 smb_buf
= (struct smb_hdr
*)iov
[0].iov_base
;
891 if ((type
== RawNTLMSSP
) && (resp_buf_type
!= CIFS_NO_BUFFER
) &&
892 (smb_buf
->Status
.CifsError
==
893 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED
))) {
894 if (phase
!= NtLmNegotiate
) {
895 cifs_dbg(VFS
, "Unexpected more processing error\n");
898 /* NTLMSSP Negotiate sent now processing challenge (response) */
899 phase
= NtLmChallenge
; /* process ntlmssp challenge */
900 rc
= 0; /* MORE_PROC rc is not an error here, but expected */
905 if ((smb_buf
->WordCount
!= 3) && (smb_buf
->WordCount
!= 4)) {
907 cifs_dbg(VFS
, "bad word count %d\n", smb_buf
->WordCount
);
910 action
= le16_to_cpu(pSMB
->resp
.Action
);
911 if (action
& GUEST_LOGIN
)
912 cifs_dbg(FYI
, "Guest login\n"); /* BB mark SesInfo struct? */
913 ses
->Suid
= smb_buf
->Uid
; /* UID left in wire format (le) */
914 cifs_dbg(FYI
, "UID = %llu\n", ses
->Suid
);
915 /* response can have either 3 or 4 word count - Samba sends 3 */
916 /* and lanman response is 3 */
917 bytes_remaining
= get_bcc(smb_buf
);
918 bcc_ptr
= pByteArea(smb_buf
);
920 if (smb_buf
->WordCount
== 4) {
921 blob_len
= le16_to_cpu(pSMB
->resp
.SecurityBlobLength
);
922 if (blob_len
> bytes_remaining
) {
923 cifs_dbg(VFS
, "bad security blob length %d\n",
928 if (phase
== NtLmChallenge
) {
929 rc
= decode_ntlmssp_challenge(bcc_ptr
, blob_len
, ses
);
930 /* now goto beginning for ntlmssp authenticate phase */
935 bytes_remaining
-= blob_len
;
938 /* BB check if Unicode and decode strings */
939 if (bytes_remaining
== 0) {
940 /* no string area to decode, do nothing */
941 } else if (smb_buf
->Flags2
& SMBFLG2_UNICODE
) {
942 /* unicode string area must be word-aligned */
943 if (((unsigned long) bcc_ptr
- (unsigned long) smb_buf
) % 2) {
947 decode_unicode_ssetup(&bcc_ptr
, bytes_remaining
, ses
, nls_cp
);
949 rc
= decode_ascii_ssetup(&bcc_ptr
, bytes_remaining
,
955 key_invalidate(spnego_key
);
961 if (resp_buf_type
== CIFS_SMALL_BUFFER
) {
962 cifs_dbg(FYI
, "ssetup freeing small buf %p\n", iov
[0].iov_base
);
963 cifs_small_buf_release(iov
[0].iov_base
);
964 } else if (resp_buf_type
== CIFS_LARGE_BUFFER
)
965 cifs_buf_release(iov
[0].iov_base
);
967 /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
968 if ((phase
== NtLmChallenge
) && (rc
== 0))
969 goto ssetup_ntlmssp_authenticate
;