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"
35 static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB)
37 __u32 capabilities = 0;
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,
48 pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
49 pSMB->req.VcNumber = cpu_to_le16(1);
51 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
53 /* BB verify whether signing required on neg or just on auth frame
56 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
57 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
59 if (ses->server->sign)
60 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
62 if (ses->capabilities & CAP_UNICODE) {
63 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
64 capabilities |= CAP_UNICODE;
66 if (ses->capabilities & CAP_STATUS32) {
67 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
68 capabilities |= CAP_STATUS32;
70 if (ses->capabilities & CAP_DFS) {
71 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
72 capabilities |= CAP_DFS;
74 if (ses->capabilities & CAP_UNIX)
75 capabilities |= CAP_UNIX;
81 unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
83 char *bcc_ptr = *pbcc_area;
87 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
89 bcc_ptr += 2 * bytes_ret;
90 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
92 bcc_ptr += 2 * bytes_ret;
93 bcc_ptr += 2; /* trailing null */
95 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
97 bcc_ptr += 2 * bytes_ret;
98 bcc_ptr += 2; /* trailing null */
100 *pbcc_area = bcc_ptr;
103 static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
104 const struct nls_table *nls_cp)
106 char *bcc_ptr = *pbcc_area;
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 */
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 */
122 *pbcc_area = bcc_ptr;
126 static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
127 const struct nls_table *nls_cp)
129 char *bcc_ptr = *pbcc_area;
132 /* BB FIXME add check that strings total less
133 than 335 or will need to send them as arrays */
135 /* unicode strings, must be word aligned before the call */
136 /* if ((long) bcc_ptr % 2) {
141 if (ses->user_name == NULL) {
142 /* null user mount */
146 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
147 CIFS_MAX_USERNAME_LEN, nls_cp);
149 bcc_ptr += 2 * bytes_ret;
150 bcc_ptr += 2; /* account for null termination */
152 unicode_domain_string(&bcc_ptr, ses, nls_cp);
153 unicode_oslm_strings(&bcc_ptr, nls_cp);
155 *pbcc_area = bcc_ptr;
158 static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
159 const struct nls_table *nls_cp)
161 char *bcc_ptr = *pbcc_area;
165 /* BB what about null user mounts - check that we do this BB */
167 if (ses->user_name != NULL) {
168 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
169 if (WARN_ON_ONCE(len < 0))
170 len = CIFS_MAX_USERNAME_LEN - 1;
173 /* else null user mount */
175 bcc_ptr++; /* account for null termination */
178 if (ses->domainName != NULL) {
179 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
180 if (WARN_ON_ONCE(len < 0))
181 len = CIFS_MAX_DOMAINNAME_LEN - 1;
183 } /* else we will send a null domain name
184 so the server will default to its own domain */
188 /* BB check for overflow here */
190 strcpy(bcc_ptr, "Linux version ");
191 bcc_ptr += strlen("Linux version ");
192 strcpy(bcc_ptr, init_utsname()->release);
193 bcc_ptr += strlen(init_utsname()->release) + 1;
195 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
196 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
198 *pbcc_area = bcc_ptr;
202 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
203 const struct nls_table *nls_cp)
206 char *data = *pbcc_area;
208 cifs_dbg(FYI, "bleft %d\n", bleft);
210 kfree(ses->serverOS);
211 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
212 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
213 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
219 kfree(ses->serverNOS);
220 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
221 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
222 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
228 kfree(ses->serverDomain);
229 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
230 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
235 static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
236 struct cifs_ses *ses,
237 const struct nls_table *nls_cp)
240 char *bcc_ptr = *pbcc_area;
242 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
244 len = strnlen(bcc_ptr, bleft);
248 kfree(ses->serverOS);
250 ses->serverOS = kmalloc(len + 1, GFP_KERNEL);
252 memcpy(ses->serverOS, bcc_ptr, len);
253 ses->serverOS[len] = 0;
254 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
255 cifs_dbg(FYI, "OS/2 server\n");
261 len = strnlen(bcc_ptr, bleft);
265 kfree(ses->serverNOS);
267 ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);
268 if (ses->serverNOS) {
269 memcpy(ses->serverNOS, bcc_ptr, len);
270 ses->serverNOS[len] = 0;
276 len = strnlen(bcc_ptr, bleft);
280 /* No domain field in LANMAN case. Domain is
281 returned by old servers in the SMB negprot response */
282 /* BB For newer servers which do not support Unicode,
283 but thus do return domain here we could add parsing
284 for it later, but it is not very important */
285 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
288 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
289 struct cifs_ses *ses)
291 unsigned int tioffset; /* challenge message target info area */
292 unsigned int tilen; /* challenge message target info area length */
294 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
296 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
297 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
301 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
302 cifs_dbg(VFS, "blob signature incorrect %s\n",
306 if (pblob->MessageType != NtLmChallenge) {
307 cifs_dbg(VFS, "Incorrect message type %d\n",
312 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
313 /* BB we could decode pblob->NegotiateFlags; some may be useful */
314 /* In particular we can examine sign flags */
315 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
316 we must set the MIC field of the AUTHENTICATE_MESSAGE */
317 ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags);
318 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
319 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
320 if (tioffset > blob_len || tioffset + tilen > blob_len) {
321 cifs_dbg(VFS, "tioffset + tilen too high %u + %u",
326 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
328 if (!ses->auth_key.response) {
329 cifs_dbg(VFS, "Challenge target info alloc failure");
332 ses->auth_key.len = tilen;
338 /* BB Move to ntlmssp.c eventually */
340 /* We do not malloc the blob, it is passed in pbuffer, because
341 it is fixed size, and small, making this approach cleaner */
342 void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
343 struct cifs_ses *ses)
345 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer;
348 memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
349 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
350 sec_blob->MessageType = NtLmNegotiate;
352 /* BB is NTLMV2 session security format easier to use here? */
353 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
354 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
355 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
356 NTLMSSP_NEGOTIATE_SEAL;
357 if (ses->server->sign)
358 flags |= NTLMSSP_NEGOTIATE_SIGN;
359 if (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
360 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
362 sec_blob->NegotiateFlags = cpu_to_le32(flags);
364 sec_blob->WorkstationName.BufferOffset = 0;
365 sec_blob->WorkstationName.Length = 0;
366 sec_blob->WorkstationName.MaximumLength = 0;
368 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
369 sec_blob->DomainName.BufferOffset = 0;
370 sec_blob->DomainName.Length = 0;
371 sec_blob->DomainName.MaximumLength = 0;
374 static int size_of_ntlmssp_blob(struct cifs_ses *ses)
376 int sz = sizeof(AUTHENTICATE_MESSAGE) + ses->auth_key.len
377 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
380 sz += 2 * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
385 sz += 2 * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
392 int build_ntlmssp_auth_blob(unsigned char **pbuffer,
394 struct cifs_ses *ses,
395 const struct nls_table *nls_cp)
398 AUTHENTICATE_MESSAGE *sec_blob;
402 rc = setup_ntlmv2_rsp(ses, nls_cp);
404 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
406 goto setup_ntlmv2_ret;
408 *pbuffer = kmalloc(size_of_ntlmssp_blob(ses), GFP_KERNEL);
411 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
413 goto setup_ntlmv2_ret;
415 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
417 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
418 sec_blob->MessageType = NtLmAuthenticate;
420 flags = NTLMSSP_NEGOTIATE_56 |
421 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
422 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
423 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
424 NTLMSSP_NEGOTIATE_SEAL;
425 if (ses->server->sign)
426 flags |= NTLMSSP_NEGOTIATE_SIGN;
427 if (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
428 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
430 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
431 sec_blob->NegotiateFlags = cpu_to_le32(flags);
433 sec_blob->LmChallengeResponse.BufferOffset =
434 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
435 sec_blob->LmChallengeResponse.Length = 0;
436 sec_blob->LmChallengeResponse.MaximumLength = 0;
438 sec_blob->NtChallengeResponse.BufferOffset =
439 cpu_to_le32(tmp - *pbuffer);
440 if (ses->user_name != NULL) {
441 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
442 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
443 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
445 sec_blob->NtChallengeResponse.Length =
446 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
447 sec_blob->NtChallengeResponse.MaximumLength =
448 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
451 * don't send an NT Response for anonymous access
453 sec_blob->NtChallengeResponse.Length = 0;
454 sec_blob->NtChallengeResponse.MaximumLength = 0;
457 if (ses->domainName == NULL) {
458 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
459 sec_blob->DomainName.Length = 0;
460 sec_blob->DomainName.MaximumLength = 0;
464 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
465 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
466 len *= 2; /* unicode is 2 bytes each */
467 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
468 sec_blob->DomainName.Length = cpu_to_le16(len);
469 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
473 if (ses->user_name == NULL) {
474 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
475 sec_blob->UserName.Length = 0;
476 sec_blob->UserName.MaximumLength = 0;
480 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
481 CIFS_MAX_USERNAME_LEN, nls_cp);
482 len *= 2; /* unicode is 2 bytes each */
483 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
484 sec_blob->UserName.Length = cpu_to_le16(len);
485 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
489 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
490 sec_blob->WorkstationName.Length = 0;
491 sec_blob->WorkstationName.MaximumLength = 0;
494 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
495 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
496 && !calc_seckey(ses)) {
497 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
498 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
499 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
500 sec_blob->SessionKey.MaximumLength =
501 cpu_to_le16(CIFS_CPHTXT_SIZE);
502 tmp += CIFS_CPHTXT_SIZE;
504 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
505 sec_blob->SessionKey.Length = 0;
506 sec_blob->SessionKey.MaximumLength = 0;
509 *buflen = tmp - *pbuffer;
515 cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
517 switch (server->negflavor) {
518 case CIFS_NEGFLAVOR_EXTENDED:
524 if (server->sec_ntlmssp &&
525 (global_secflags & CIFSSEC_MAY_NTLMSSP))
527 if ((server->sec_kerberos || server->sec_mskerberos) &&
528 (global_secflags & CIFSSEC_MAY_KRB5))
534 case CIFS_NEGFLAVOR_UNENCAP:
540 if (global_secflags & CIFSSEC_MAY_NTLMV2)
542 if (global_secflags & CIFSSEC_MAY_NTLM)
547 /* Fallthrough - to attempt LANMAN authentication next */
548 case CIFS_NEGFLAVOR_LANMAN:
553 if (global_secflags & CIFSSEC_MAY_LANMAN)
566 struct cifs_ses *ses;
567 struct nls_table *nls_cp;
568 void (*func)(struct sess_data *);
571 /* we will send the SMB in three pieces:
572 * a fixed length beginning part, an optional
573 * SPNEGO blob (which can be zero length), and a
574 * last part which will include the strings
575 * and rest of bcc area. This allows us to avoid
576 * a large buffer 17K allocation
583 sess_alloc_buffer(struct sess_data *sess_data, int wct)
586 struct cifs_ses *ses = sess_data->ses;
587 struct smb_hdr *smb_buf;
589 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
595 sess_data->iov[0].iov_base = (char *)smb_buf;
596 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
598 * This variable will be used to clear the buffer
599 * allocated above in case of any error in the calling function.
601 sess_data->buf0_type = CIFS_SMALL_BUFFER;
603 /* 2000 big enough to fit max user, domain, NOS name etc. */
604 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
605 if (!sess_data->iov[2].iov_base) {
607 goto out_free_smb_buf;
614 sess_data->iov[0].iov_base = NULL;
615 sess_data->iov[0].iov_len = 0;
616 sess_data->buf0_type = CIFS_NO_BUFFER;
621 sess_free_buffer(struct sess_data *sess_data)
624 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
625 sess_data->buf0_type = CIFS_NO_BUFFER;
626 kfree(sess_data->iov[2].iov_base);
630 sess_establish_session(struct sess_data *sess_data)
632 struct cifs_ses *ses = sess_data->ses;
634 mutex_lock(&ses->server->srv_mutex);
635 if (!ses->server->session_estab) {
636 if (ses->server->sign) {
637 ses->server->session_key.response =
638 kmemdup(ses->auth_key.response,
639 ses->auth_key.len, GFP_KERNEL);
640 if (!ses->server->session_key.response) {
641 mutex_unlock(&ses->server->srv_mutex);
644 ses->server->session_key.len =
647 ses->server->sequence_number = 0x2;
648 ses->server->session_estab = true;
650 mutex_unlock(&ses->server->srv_mutex);
652 cifs_dbg(FYI, "CIFS session established successfully\n");
653 spin_lock(&GlobalMid_Lock);
654 ses->status = CifsGood;
655 ses->need_reconnect = false;
656 spin_unlock(&GlobalMid_Lock);
662 sess_sendreceive(struct sess_data *sess_data)
665 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
667 struct kvec rsp_iov = { NULL, 0 };
669 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
670 smb_buf->smb_buf_length =
671 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
672 put_bcc(count, smb_buf);
674 rc = SendReceive2(sess_data->xid, sess_data->ses,
675 sess_data->iov, 3 /* num_iovecs */,
676 &sess_data->buf0_type,
677 CIFS_LOG_ERROR, &rsp_iov);
678 cifs_small_buf_release(sess_data->iov[0].iov_base);
679 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
685 * LANMAN and plaintext are less secure and off by default.
686 * So we make this explicitly be turned on in kconfig (in the
687 * build) and turned on at runtime (changed from the default)
688 * in proc/fs/cifs or via mount parm. Unfortunately this is
689 * needed for old Win (e.g. Win95), some obscure NAS and OS/2
691 #ifdef CONFIG_CIFS_WEAK_PW_HASH
693 sess_auth_lanman(struct sess_data *sess_data)
696 struct smb_hdr *smb_buf;
697 SESSION_SETUP_ANDX *pSMB;
699 struct cifs_ses *ses = sess_data->ses;
700 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
702 __u16 bytes_remaining;
704 /* lanman 2 style sessionsetup */
706 rc = sess_alloc_buffer(sess_data, 10);
710 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
711 bcc_ptr = sess_data->iov[2].iov_base;
712 capabilities = cifs_ssetup_hdr(ses, pSMB);
714 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
716 if (ses->user_name != NULL) {
717 /* no capabilities flags in old lanman negotiation */
718 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
720 /* Calculate hash with password and copy into bcc_ptr.
721 * Encryption Key (stored as in cryptkey) gets used if the
722 * security mode bit in Negottiate Protocol response states
723 * to use challenge/response method (i.e. Password bit is 1).
725 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
726 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
727 true : false, lnm_session_key);
731 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
732 bcc_ptr += CIFS_AUTH_RESP_SIZE;
734 pSMB->old_req.PasswordLength = 0;
738 * can not sign if LANMAN negotiated so no need
739 * to calculate signing key? but what if server
740 * changed to do higher than lanman dialect and
741 * we reconnected would we ever calc signing_key?
744 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
745 /* Unicode not allowed for LANMAN dialects */
746 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
748 sess_data->iov[2].iov_len = (long) bcc_ptr -
749 (long) sess_data->iov[2].iov_base;
751 rc = sess_sendreceive(sess_data);
755 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
756 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
758 /* lanman response has a word count of 3 */
759 if (smb_buf->WordCount != 3) {
761 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
765 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
766 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
768 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
769 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
771 bytes_remaining = get_bcc(smb_buf);
772 bcc_ptr = pByteArea(smb_buf);
774 /* BB check if Unicode and decode strings */
775 if (bytes_remaining == 0) {
776 /* no string area to decode, do nothing */
777 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
778 /* unicode string area must be word-aligned */
779 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
783 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
786 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
790 rc = sess_establish_session(sess_data);
792 sess_data->result = rc;
793 sess_data->func = NULL;
794 sess_free_buffer(sess_data);
800 sess_auth_ntlm(struct sess_data *sess_data)
803 struct smb_hdr *smb_buf;
804 SESSION_SETUP_ANDX *pSMB;
806 struct cifs_ses *ses = sess_data->ses;
808 __u16 bytes_remaining;
810 /* old style NTLM sessionsetup */
812 rc = sess_alloc_buffer(sess_data, 13);
816 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
817 bcc_ptr = sess_data->iov[2].iov_base;
818 capabilities = cifs_ssetup_hdr(ses, pSMB);
820 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
821 if (ses->user_name != NULL) {
822 pSMB->req_no_secext.CaseInsensitivePasswordLength =
823 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
824 pSMB->req_no_secext.CaseSensitivePasswordLength =
825 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
827 /* calculate ntlm response and session key */
828 rc = setup_ntlm_response(ses, sess_data->nls_cp);
830 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
835 /* copy ntlm response */
836 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
837 CIFS_AUTH_RESP_SIZE);
838 bcc_ptr += CIFS_AUTH_RESP_SIZE;
839 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
840 CIFS_AUTH_RESP_SIZE);
841 bcc_ptr += CIFS_AUTH_RESP_SIZE;
843 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
844 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
847 if (ses->capabilities & CAP_UNICODE) {
848 /* unicode strings must be word aligned */
849 if (sess_data->iov[0].iov_len % 2) {
853 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
855 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
859 sess_data->iov[2].iov_len = (long) bcc_ptr -
860 (long) sess_data->iov[2].iov_base;
862 rc = sess_sendreceive(sess_data);
866 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
867 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
869 if (smb_buf->WordCount != 3) {
871 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
875 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
876 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
878 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
879 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
881 bytes_remaining = get_bcc(smb_buf);
882 bcc_ptr = pByteArea(smb_buf);
884 /* BB check if Unicode and decode strings */
885 if (bytes_remaining == 0) {
886 /* no string area to decode, do nothing */
887 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
888 /* unicode string area must be word-aligned */
889 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
893 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
896 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
900 rc = sess_establish_session(sess_data);
902 sess_data->result = rc;
903 sess_data->func = NULL;
904 sess_free_buffer(sess_data);
905 kfree(ses->auth_key.response);
906 ses->auth_key.response = NULL;
910 sess_auth_ntlmv2(struct sess_data *sess_data)
913 struct smb_hdr *smb_buf;
914 SESSION_SETUP_ANDX *pSMB;
916 struct cifs_ses *ses = sess_data->ses;
918 __u16 bytes_remaining;
920 /* old style NTLM sessionsetup */
922 rc = sess_alloc_buffer(sess_data, 13);
926 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
927 bcc_ptr = sess_data->iov[2].iov_base;
928 capabilities = cifs_ssetup_hdr(ses, pSMB);
930 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
932 /* LM2 password would be here if we supported it */
933 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
935 if (ses->user_name != NULL) {
936 /* calculate nlmv2 response and session key */
937 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
939 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
943 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
944 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
945 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
947 /* set case sensitive password length after tilen may get
948 * assigned, tilen is 0 otherwise.
950 pSMB->req_no_secext.CaseSensitivePasswordLength =
951 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
953 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
956 if (ses->capabilities & CAP_UNICODE) {
957 if (sess_data->iov[0].iov_len % 2) {
961 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
963 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
967 sess_data->iov[2].iov_len = (long) bcc_ptr -
968 (long) sess_data->iov[2].iov_base;
970 rc = sess_sendreceive(sess_data);
974 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
975 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
977 if (smb_buf->WordCount != 3) {
979 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
983 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
984 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
986 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
987 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
989 bytes_remaining = get_bcc(smb_buf);
990 bcc_ptr = pByteArea(smb_buf);
992 /* BB check if Unicode and decode strings */
993 if (bytes_remaining == 0) {
994 /* no string area to decode, do nothing */
995 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
996 /* unicode string area must be word-aligned */
997 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1001 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1004 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1008 rc = sess_establish_session(sess_data);
1010 sess_data->result = rc;
1011 sess_data->func = NULL;
1012 sess_free_buffer(sess_data);
1013 kfree(ses->auth_key.response);
1014 ses->auth_key.response = NULL;
1017 #ifdef CONFIG_CIFS_UPCALL
1019 sess_auth_kerberos(struct sess_data *sess_data)
1022 struct smb_hdr *smb_buf;
1023 SESSION_SETUP_ANDX *pSMB;
1025 struct cifs_ses *ses = sess_data->ses;
1027 __u16 bytes_remaining;
1028 struct key *spnego_key = NULL;
1029 struct cifs_spnego_msg *msg;
1032 /* extended security */
1034 rc = sess_alloc_buffer(sess_data, 12);
1038 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1039 bcc_ptr = sess_data->iov[2].iov_base;
1040 capabilities = cifs_ssetup_hdr(ses, pSMB);
1042 spnego_key = cifs_get_spnego_key(ses);
1043 if (IS_ERR(spnego_key)) {
1044 rc = PTR_ERR(spnego_key);
1049 msg = spnego_key->payload.data[0];
1051 * check version field to make sure that cifs.upcall is
1052 * sending us a response in an expected form
1054 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1056 "incorrect version of cifs.upcall (expected %d but got %d)",
1057 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1059 goto out_put_spnego_key;
1062 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1064 if (!ses->auth_key.response) {
1065 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory",
1068 goto out_put_spnego_key;
1070 ses->auth_key.len = msg->sesskey_len;
1072 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1073 capabilities |= CAP_EXTENDED_SECURITY;
1074 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1075 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1076 sess_data->iov[1].iov_len = msg->secblob_len;
1077 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1079 if (ses->capabilities & CAP_UNICODE) {
1080 /* unicode strings must be word aligned */
1081 if ((sess_data->iov[0].iov_len
1082 + sess_data->iov[1].iov_len) % 2) {
1086 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1087 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1089 /* BB: is this right? */
1090 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1093 sess_data->iov[2].iov_len = (long) bcc_ptr -
1094 (long) sess_data->iov[2].iov_base;
1096 rc = sess_sendreceive(sess_data);
1098 goto out_put_spnego_key;
1100 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1101 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1103 if (smb_buf->WordCount != 4) {
1105 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1106 goto out_put_spnego_key;
1109 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1110 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1112 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1113 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1115 bytes_remaining = get_bcc(smb_buf);
1116 bcc_ptr = pByteArea(smb_buf);
1118 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1119 if (blob_len > bytes_remaining) {
1120 cifs_dbg(VFS, "bad security blob length %d\n",
1123 goto out_put_spnego_key;
1125 bcc_ptr += blob_len;
1126 bytes_remaining -= blob_len;
1128 /* BB check if Unicode and decode strings */
1129 if (bytes_remaining == 0) {
1130 /* no string area to decode, do nothing */
1131 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1132 /* unicode string area must be word-aligned */
1133 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1137 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1140 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1144 rc = sess_establish_session(sess_data);
1146 key_invalidate(spnego_key);
1147 key_put(spnego_key);
1149 sess_data->result = rc;
1150 sess_data->func = NULL;
1151 sess_free_buffer(sess_data);
1152 kfree(ses->auth_key.response);
1153 ses->auth_key.response = NULL;
1156 #endif /* ! CONFIG_CIFS_UPCALL */
1159 * The required kvec buffers have to be allocated before calling this
1163 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1165 SESSION_SETUP_ANDX *pSMB;
1166 struct cifs_ses *ses = sess_data->ses;
1170 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1172 capabilities = cifs_ssetup_hdr(ses, pSMB);
1173 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1174 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1178 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1179 capabilities |= CAP_EXTENDED_SECURITY;
1180 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1182 bcc_ptr = sess_data->iov[2].iov_base;
1183 /* unicode strings must be word aligned */
1184 if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1188 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1190 sess_data->iov[2].iov_len = (long) bcc_ptr -
1191 (long) sess_data->iov[2].iov_base;
1197 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1200 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1203 struct smb_hdr *smb_buf;
1204 SESSION_SETUP_ANDX *pSMB;
1205 struct cifs_ses *ses = sess_data->ses;
1206 __u16 bytes_remaining;
1210 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1213 * if memory allocation is successful, caller of this function
1216 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1217 if (!ses->ntlmssp) {
1221 ses->ntlmssp->sesskey_per_smbsess = false;
1224 rc = sess_alloc_buffer(sess_data, 12);
1228 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1230 /* Build security blob before we assemble the request */
1231 build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
1232 sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
1233 sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
1234 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
1236 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1240 rc = sess_sendreceive(sess_data);
1242 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1243 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1245 /* If true, rc here is expected and not an error */
1246 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1247 smb_buf->Status.CifsError ==
1248 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1254 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1256 if (smb_buf->WordCount != 4) {
1258 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1262 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1263 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1265 bytes_remaining = get_bcc(smb_buf);
1266 bcc_ptr = pByteArea(smb_buf);
1268 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1269 if (blob_len > bytes_remaining) {
1270 cifs_dbg(VFS, "bad security blob length %d\n",
1276 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1278 sess_free_buffer(sess_data);
1281 sess_data->func = sess_auth_rawntlmssp_authenticate;
1285 /* Else error. Cleanup */
1286 kfree(ses->auth_key.response);
1287 ses->auth_key.response = NULL;
1288 kfree(ses->ntlmssp);
1289 ses->ntlmssp = NULL;
1291 sess_data->func = NULL;
1292 sess_data->result = rc;
1296 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1299 struct smb_hdr *smb_buf;
1300 SESSION_SETUP_ANDX *pSMB;
1301 struct cifs_ses *ses = sess_data->ses;
1302 __u16 bytes_remaining;
1304 unsigned char *ntlmsspblob = NULL;
1307 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1310 rc = sess_alloc_buffer(sess_data, 12);
1314 /* Build security blob before we assemble the request */
1315 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1316 smb_buf = (struct smb_hdr *)pSMB;
1317 rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1318 &blob_len, ses, sess_data->nls_cp);
1320 goto out_free_ntlmsspblob;
1321 sess_data->iov[1].iov_len = blob_len;
1322 sess_data->iov[1].iov_base = ntlmsspblob;
1323 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1325 * Make sure that we tell the server that we are using
1326 * the uid that it just gave us back on the response
1329 smb_buf->Uid = ses->Suid;
1331 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1333 goto out_free_ntlmsspblob;
1335 rc = sess_sendreceive(sess_data);
1337 goto out_free_ntlmsspblob;
1339 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1340 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1341 if (smb_buf->WordCount != 4) {
1343 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1344 goto out_free_ntlmsspblob;
1347 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1348 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1350 if (ses->Suid != smb_buf->Uid) {
1351 ses->Suid = smb_buf->Uid;
1352 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1355 bytes_remaining = get_bcc(smb_buf);
1356 bcc_ptr = pByteArea(smb_buf);
1357 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1358 if (blob_len > bytes_remaining) {
1359 cifs_dbg(VFS, "bad security blob length %d\n",
1362 goto out_free_ntlmsspblob;
1364 bcc_ptr += blob_len;
1365 bytes_remaining -= blob_len;
1368 /* BB check if Unicode and decode strings */
1369 if (bytes_remaining == 0) {
1370 /* no string area to decode, do nothing */
1371 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1372 /* unicode string area must be word-aligned */
1373 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1377 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1380 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1384 out_free_ntlmsspblob:
1387 sess_free_buffer(sess_data);
1390 rc = sess_establish_session(sess_data);
1393 kfree(ses->auth_key.response);
1394 ses->auth_key.response = NULL;
1395 kfree(ses->ntlmssp);
1396 ses->ntlmssp = NULL;
1398 sess_data->func = NULL;
1399 sess_data->result = rc;
1402 static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
1406 type = cifs_select_sectype(ses->server, ses->sectype);
1407 cifs_dbg(FYI, "sess setup type %d\n", type);
1408 if (type == Unspecified) {
1410 "Unable to select appropriate authentication method!");
1416 /* LANMAN and plaintext are less secure and off by default.
1417 * So we make this explicitly be turned on in kconfig (in the
1418 * build) and turned on at runtime (changed from the default)
1419 * in proc/fs/cifs or via mount parm. Unfortunately this is
1420 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
1421 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1422 sess_data->func = sess_auth_lanman;
1428 sess_data->func = sess_auth_ntlm;
1431 sess_data->func = sess_auth_ntlmv2;
1434 #ifdef CONFIG_CIFS_UPCALL
1435 sess_data->func = sess_auth_kerberos;
1438 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1441 #endif /* CONFIG_CIFS_UPCALL */
1443 sess_data->func = sess_auth_rawntlmssp_negotiate;
1446 cifs_dbg(VFS, "secType %d not supported!\n", type);
1453 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1454 const struct nls_table *nls_cp)
1457 struct sess_data *sess_data;
1460 WARN(1, "%s: ses == NULL!", __func__);
1464 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1468 rc = select_sec(ses, sess_data);
1472 sess_data->xid = xid;
1473 sess_data->ses = ses;
1474 sess_data->buf0_type = CIFS_NO_BUFFER;
1475 sess_data->nls_cp = (struct nls_table *) nls_cp;
1477 while (sess_data->func)
1478 sess_data->func(sess_data);
1480 /* Store result before we free sess_data */
1481 rc = sess_data->result;