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 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
39 * Checks if this is the first smb session to be reconnected after
40 * the socket has been reestablished (so we know whether to use vc 0).
41 * Called while holding the cifs_tcp_ses_lock, so do not block
43 static bool is_first_ses_reconnect(struct cifsSesInfo *ses)
45 struct list_head *tmp;
46 struct cifsSesInfo *tmp_ses;
48 list_for_each(tmp, &ses->server->smb_ses_list) {
49 tmp_ses = list_entry(tmp, struct cifsSesInfo,
51 if (tmp_ses->need_reconnect == false)
54 /* could not find a session that was already connected,
55 this must be the first one we are reconnecting */
60 * vc number 0 is treated specially by some servers, and should be the
61 * first one we request. After that we can use vcnumbers up to maxvcs,
62 * one for each smb session (some Windows versions set maxvcs incorrectly
63 * so maxvc=1 can be ignored). If we have too many vcs, we can reuse
64 * any vc but zero (some servers reset the connection on vcnum zero)
67 static __le16 get_next_vcnum(struct cifsSesInfo *ses)
70 struct list_head *tmp;
71 struct cifsSesInfo *tmp_ses;
72 __u16 max_vcs = ses->server->max_vcs;
74 int free_vc_found = 0;
76 /* Quoting the MS-SMB specification: "Windows-based SMB servers set this
77 field to one but do not enforce this limit, which allows an SMB client
78 to establish more virtual circuits than allowed by this value ... but
79 other server implementations can enforce this limit." */
83 write_lock(&cifs_tcp_ses_lock);
84 if ((ses->need_reconnect) && is_first_ses_reconnect(ses))
85 goto get_vc_num_exit; /* vcnum will be zero */
86 for (i = ses->server->srv_count - 1; i < max_vcs; i++) {
87 if (i == 0) /* this is the only connection, use vc 0 */
92 list_for_each(tmp, &ses->server->smb_ses_list) {
93 tmp_ses = list_entry(tmp, struct cifsSesInfo,
95 if (tmp_ses->vcnum == i) {
97 break; /* found duplicate, try next vcnum */
101 break; /* we found a vcnumber that will work - use it */
105 vcnum = 0; /* for most common case, ie if one smb session, use
106 vc zero. Also for case when no free vcnum, zero
107 is safest to send (some clients only send zero) */
108 else if (free_vc_found == 0)
109 vcnum = 1; /* we can not reuse vc=0 safely, since some servers
110 reset all uids on that, but 1 is ok. */
115 write_unlock(&cifs_tcp_ses_lock);
117 return cpu_to_le16(vcnum);
120 static __u32 cifs_ssetup_hdr(struct cifsSesInfo *ses, SESSION_SETUP_ANDX *pSMB)
122 __u32 capabilities = 0;
124 /* init fields common to all four types of SessSetup */
125 /* Note that offsets for first seven fields in req struct are same */
126 /* in CIFS Specs so does not matter which of 3 forms of struct */
127 /* that we use in next few lines */
128 /* Note that header is initialized to zero in header_assemble */
129 pSMB->req.AndXCommand = 0xFF;
130 pSMB->req.MaxBufferSize = cpu_to_le16(ses->server->maxBuf);
131 pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
132 pSMB->req.VcNumber = get_next_vcnum(ses);
134 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
136 /* BB verify whether signing required on neg or just on auth frame
139 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
140 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
142 if (ses->server->secMode &
143 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
144 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
146 if (ses->capabilities & CAP_UNICODE) {
147 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
148 capabilities |= CAP_UNICODE;
150 if (ses->capabilities & CAP_STATUS32) {
151 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
152 capabilities |= CAP_STATUS32;
154 if (ses->capabilities & CAP_DFS) {
155 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
156 capabilities |= CAP_DFS;
158 if (ses->capabilities & CAP_UNIX)
159 capabilities |= CAP_UNIX;
165 unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
167 char *bcc_ptr = *pbcc_area;
170 /* Copy OS version */
171 bytes_ret = cifs_strtoUCS((__le16 *)bcc_ptr, "Linux version ", 32,
173 bcc_ptr += 2 * bytes_ret;
174 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, init_utsname()->release,
176 bcc_ptr += 2 * bytes_ret;
177 bcc_ptr += 2; /* trailing null */
179 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
181 bcc_ptr += 2 * bytes_ret;
182 bcc_ptr += 2; /* trailing null */
184 *pbcc_area = bcc_ptr;
187 static void unicode_domain_string(char **pbcc_area, struct cifsSesInfo *ses,
188 const struct nls_table *nls_cp)
190 char *bcc_ptr = *pbcc_area;
194 if (ses->domainName == NULL) {
195 /* Sending null domain better than using a bogus domain name (as
196 we did briefly in 2.6.18) since server will use its default */
201 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->domainName,
203 bcc_ptr += 2 * bytes_ret;
204 bcc_ptr += 2; /* account for null terminator */
206 *pbcc_area = bcc_ptr;
210 static void unicode_ssetup_strings(char **pbcc_area, struct cifsSesInfo *ses,
211 const struct nls_table *nls_cp)
213 char *bcc_ptr = *pbcc_area;
216 /* BB FIXME add check that strings total less
217 than 335 or will need to send them as arrays */
219 /* unicode strings, must be word aligned before the call */
220 /* if ((long) bcc_ptr % 2) {
225 if (ses->userName == NULL) {
226 /* null user mount */
230 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->userName,
231 MAX_USERNAME_SIZE, nls_cp);
233 bcc_ptr += 2 * bytes_ret;
234 bcc_ptr += 2; /* account for null termination */
236 unicode_domain_string(&bcc_ptr, ses, nls_cp);
237 unicode_oslm_strings(&bcc_ptr, nls_cp);
239 *pbcc_area = bcc_ptr;
242 static void ascii_ssetup_strings(char **pbcc_area, struct cifsSesInfo *ses,
243 const struct nls_table *nls_cp)
245 char *bcc_ptr = *pbcc_area;
248 /* BB what about null user mounts - check that we do this BB */
250 if (ses->userName == NULL) {
251 /* BB what about null user mounts - check that we do this BB */
253 strncpy(bcc_ptr, ses->userName, MAX_USERNAME_SIZE);
255 bcc_ptr += strnlen(ses->userName, MAX_USERNAME_SIZE);
257 bcc_ptr++; /* account for null termination */
261 if (ses->domainName != NULL) {
262 strncpy(bcc_ptr, ses->domainName, 256);
263 bcc_ptr += strnlen(ses->domainName, 256);
264 } /* else we will send a null domain name
265 so the server will default to its own domain */
269 /* BB check for overflow here */
271 strcpy(bcc_ptr, "Linux version ");
272 bcc_ptr += strlen("Linux version ");
273 strcpy(bcc_ptr, init_utsname()->release);
274 bcc_ptr += strlen(init_utsname()->release) + 1;
276 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
277 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
279 *pbcc_area = bcc_ptr;
283 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifsSesInfo *ses,
284 const struct nls_table *nls_cp)
287 char *data = *pbcc_area;
289 cFYI(1, "bleft %d", bleft);
292 * Windows servers do not always double null terminate their final
293 * Unicode string. Check to see if there are an uneven number of bytes
294 * left. If so, then add an extra NULL pad byte to the end of the
297 * See section 2.7.2 in "Implementing CIFS" for details
304 kfree(ses->serverOS);
305 ses->serverOS = cifs_strndup_from_ucs(data, bleft, true, nls_cp);
306 cFYI(1, "serverOS=%s", ses->serverOS);
307 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
313 kfree(ses->serverNOS);
314 ses->serverNOS = cifs_strndup_from_ucs(data, bleft, true, nls_cp);
315 cFYI(1, "serverNOS=%s", ses->serverNOS);
316 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
322 kfree(ses->serverDomain);
323 ses->serverDomain = cifs_strndup_from_ucs(data, bleft, true, nls_cp);
324 cFYI(1, "serverDomain=%s", ses->serverDomain);
329 static int decode_ascii_ssetup(char **pbcc_area, int bleft,
330 struct cifsSesInfo *ses,
331 const struct nls_table *nls_cp)
335 char *bcc_ptr = *pbcc_area;
337 cFYI(1, "decode sessetup ascii. bleft %d", bleft);
339 len = strnlen(bcc_ptr, bleft);
343 kfree(ses->serverOS);
345 ses->serverOS = kzalloc(len + 1, GFP_KERNEL);
347 strncpy(ses->serverOS, bcc_ptr, len);
348 if (strncmp(ses->serverOS, "OS/2", 4) == 0) {
349 cFYI(1, "OS/2 server");
350 ses->flags |= CIFS_SES_OS2;
356 len = strnlen(bcc_ptr, bleft);
360 kfree(ses->serverNOS);
362 ses->serverNOS = kzalloc(len + 1, GFP_KERNEL);
364 strncpy(ses->serverNOS, bcc_ptr, len);
369 len = strnlen(bcc_ptr, bleft);
373 /* No domain field in LANMAN case. Domain is
374 returned by old servers in the SMB negprot response */
375 /* BB For newer servers which do not support Unicode,
376 but thus do return domain here we could add parsing
377 for it later, but it is not very important */
378 cFYI(1, "ascii: bytes left %d", bleft);
383 static int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
384 struct cifsSesInfo *ses)
386 unsigned int tioffset; /* challeng message target info area */
387 unsigned int tilen; /* challeng message target info area length */
389 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
391 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
392 cERROR(1, "challenge blob len %d too small", blob_len);
396 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
397 cERROR(1, "blob signature incorrect %s", pblob->Signature);
400 if (pblob->MessageType != NtLmChallenge) {
401 cERROR(1, "Incorrect message type %d", pblob->MessageType);
405 memcpy(ses->server->cryptKey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
406 /* BB we could decode pblob->NegotiateFlags; some may be useful */
407 /* In particular we can examine sign flags */
408 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
409 we must set the MIC field of the AUTHENTICATE_MESSAGE */
411 tioffset = cpu_to_le16(pblob->TargetInfoArray.BufferOffset);
412 tilen = cpu_to_le16(pblob->TargetInfoArray.Length);
413 ses->server->tilen = tilen;
415 ses->server->tiblob = kmalloc(tilen, GFP_KERNEL);
416 if (!ses->server->tiblob) {
417 cERROR(1, "Challenge target info allocation failure");
420 memcpy(ses->server->tiblob, bcc_ptr + tioffset, tilen);
426 #ifdef CONFIG_CIFS_EXPERIMENTAL
427 /* BB Move to ntlmssp.c eventually */
429 /* We do not malloc the blob, it is passed in pbuffer, because
430 it is fixed size, and small, making this approach cleaner */
431 static void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
432 struct cifsSesInfo *ses)
434 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer;
437 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
438 sec_blob->MessageType = NtLmNegotiate;
440 /* BB is NTLMV2 session security format easier to use here? */
441 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
442 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
443 NTLMSSP_NEGOTIATE_NT_ONLY | NTLMSSP_NEGOTIATE_NTLM;
444 if (ses->server->secMode &
445 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
446 flags |= NTLMSSP_NEGOTIATE_SIGN;
447 if (ses->server->secMode & SECMODE_SIGN_REQUIRED)
448 flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
450 sec_blob->NegotiateFlags |= cpu_to_le32(flags);
452 sec_blob->WorkstationName.BufferOffset = 0;
453 sec_blob->WorkstationName.Length = 0;
454 sec_blob->WorkstationName.MaximumLength = 0;
456 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
457 sec_blob->DomainName.BufferOffset = 0;
458 sec_blob->DomainName.Length = 0;
459 sec_blob->DomainName.MaximumLength = 0;
462 /* We do not malloc the blob, it is passed in pbuffer, because its
463 maximum possible size is fixed and small, making this approach cleaner.
464 This function returns the length of the data in the blob */
465 static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
466 struct cifsSesInfo *ses,
467 const struct nls_table *nls_cp, bool first)
471 AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer;
474 struct ntlmv2_resp ntlmv2_response = {};
476 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
477 sec_blob->MessageType = NtLmAuthenticate;
479 flags = NTLMSSP_NEGOTIATE_56 |
480 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
481 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
482 NTLMSSP_NEGOTIATE_NT_ONLY | NTLMSSP_NEGOTIATE_NTLM;
483 if (ses->server->secMode &
484 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
485 flags |= NTLMSSP_NEGOTIATE_SIGN;
486 if (ses->server->secMode & SECMODE_SIGN_REQUIRED)
487 flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
489 tmp = pbuffer + sizeof(AUTHENTICATE_MESSAGE);
490 sec_blob->NegotiateFlags |= cpu_to_le32(flags);
492 sec_blob->LmChallengeResponse.BufferOffset =
493 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
494 sec_blob->LmChallengeResponse.Length = 0;
495 sec_blob->LmChallengeResponse.MaximumLength = 0;
497 sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer);
498 rc = setup_ntlmv2_rsp(ses, (char *)&ntlmv2_response, nls_cp);
500 cERROR(1, "error rc: %d during ntlmssp ntlmv2 setup", rc);
501 goto setup_ntlmv2_ret;
503 size = sizeof(struct ntlmv2_resp);
504 memcpy(tmp, (char *)&ntlmv2_response, size);
506 if (ses->server->tilen > 0) {
507 memcpy(tmp, ses->server->tiblob, ses->server->tilen);
508 tmp += ses->server->tilen;
510 ses->server->tilen = 0;
512 sec_blob->NtChallengeResponse.Length = cpu_to_le16(size +
514 sec_blob->NtChallengeResponse.MaximumLength =
515 cpu_to_le16(size + ses->server->tilen);
517 if (ses->domainName == NULL) {
518 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
519 sec_blob->DomainName.Length = 0;
520 sec_blob->DomainName.MaximumLength = 0;
524 len = cifs_strtoUCS((__le16 *)tmp, ses->domainName,
525 MAX_USERNAME_SIZE, nls_cp);
526 len *= 2; /* unicode is 2 bytes each */
527 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
528 sec_blob->DomainName.Length = cpu_to_le16(len);
529 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
533 if (ses->userName == NULL) {
534 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
535 sec_blob->UserName.Length = 0;
536 sec_blob->UserName.MaximumLength = 0;
540 len = cifs_strtoUCS((__le16 *)tmp, ses->userName,
541 MAX_USERNAME_SIZE, nls_cp);
542 len *= 2; /* unicode is 2 bytes each */
543 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
544 sec_blob->UserName.Length = cpu_to_le16(len);
545 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
549 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - pbuffer);
550 sec_blob->WorkstationName.Length = 0;
551 sec_blob->WorkstationName.MaximumLength = 0;
554 if ((ses->server->ntlmssp.server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
555 !calc_seckey(ses->server)) {
556 memcpy(tmp, ses->server->ntlmssp.ciphertext, CIFS_CPHTXT_SIZE);
557 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
558 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
559 sec_blob->SessionKey.MaximumLength =
560 cpu_to_le16(CIFS_CPHTXT_SIZE);
561 tmp += CIFS_CPHTXT_SIZE;
563 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
564 sec_blob->SessionKey.Length = 0;
565 sec_blob->SessionKey.MaximumLength = 0;
568 ses->server->sequence_number = 0;
571 if (ses->server->tilen > 0)
572 kfree(ses->server->tiblob);
574 return tmp - pbuffer;
578 static void setup_ntlmssp_neg_req(SESSION_SETUP_ANDX *pSMB,
579 struct cifsSesInfo *ses)
581 build_ntlmssp_negotiate_blob(&pSMB->req.SecurityBlob[0], ses);
582 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
587 static int setup_ntlmssp_auth_req(char *ntlmsspblob,
588 struct cifsSesInfo *ses,
589 const struct nls_table *nls, bool first_time)
593 bloblen = build_ntlmssp_auth_blob(ntlmsspblob, ses, nls,
601 CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses,
602 const struct nls_table *nls_cp)
606 struct smb_hdr *smb_buf;
609 SESSION_SETUP_ANDX *pSMB;
614 enum securityEnum type;
617 struct key *spnego_key = NULL;
618 __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
625 read_lock(&cifs_tcp_ses_lock);
626 first_time = is_first_ses_reconnect(ses);
627 read_unlock(&cifs_tcp_ses_lock);
629 type = ses->server->secType;
631 cFYI(1, "sess setup type %d", type);
632 ssetup_ntlmssp_authenticate:
633 if (phase == NtLmChallenge)
634 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
636 if (type == LANMAN) {
637 #ifndef CONFIG_CIFS_WEAK_PW_HASH
638 /* LANMAN and plaintext are less secure and off by default.
639 So we make this explicitly be turned on in kconfig (in the
640 build) and turned on at runtime (changed from the default)
641 in proc/fs/cifs or via mount parm. Unfortunately this is
642 needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
645 wct = 10; /* lanman 2 style sessionsetup */
646 } else if ((type == NTLM) || (type == NTLMv2)) {
647 /* For NTLMv2 failures eventually may need to retry NTLM */
648 wct = 13; /* old style NTLM sessionsetup */
649 } else /* same size: negotiate or auth, NTLMSSP or extended security */
652 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
657 pSMB = (SESSION_SETUP_ANDX *)smb_buf;
659 capabilities = cifs_ssetup_hdr(ses, pSMB);
661 /* we will send the SMB in three pieces:
662 a fixed length beginning part, an optional
663 SPNEGO blob (which can be zero length), and a
664 last part which will include the strings
665 and rest of bcc area. This allows us to avoid
666 a large buffer 17K allocation */
667 iov[0].iov_base = (char *)pSMB;
668 iov[0].iov_len = smb_buf->smb_buf_length + 4;
670 /* setting this here allows the code at the end of the function
671 to free the request buffer if there's an error */
672 resp_buf_type = CIFS_SMALL_BUFFER;
674 /* 2000 big enough to fit max user, domain, NOS name etc. */
675 str_area = kmalloc(2000, GFP_KERNEL);
676 if (str_area == NULL) {
682 ses->flags &= ~CIFS_SES_LANMAN;
684 iov[1].iov_base = NULL;
687 if (type == LANMAN) {
688 #ifdef CONFIG_CIFS_WEAK_PW_HASH
689 char lnm_session_key[CIFS_SESS_KEY_SIZE];
691 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
693 /* no capabilities flags in old lanman negotiation */
695 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
696 /* BB calculate hash with password */
697 /* and copy into bcc */
699 calc_lanman_hash(ses->password, ses->server->cryptKey,
700 ses->server->secMode & SECMODE_PW_ENCRYPT ?
701 true : false, lnm_session_key);
703 ses->flags |= CIFS_SES_LANMAN;
704 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_SESS_KEY_SIZE);
705 bcc_ptr += CIFS_SESS_KEY_SIZE;
707 /* can not sign if LANMAN negotiated so no need
708 to calculate signing key? but what if server
709 changed to do higher than lanman dialect and
710 we reconnected would we ever calc signing_key? */
712 cFYI(1, "Negotiating LANMAN setting up strings");
713 /* Unicode not allowed for LANMAN dialects */
714 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
716 } else if (type == NTLM) {
717 char ntlm_session_key[CIFS_SESS_KEY_SIZE];
719 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
720 pSMB->req_no_secext.CaseInsensitivePasswordLength =
721 cpu_to_le16(CIFS_SESS_KEY_SIZE);
722 pSMB->req_no_secext.CaseSensitivePasswordLength =
723 cpu_to_le16(CIFS_SESS_KEY_SIZE);
725 /* calculate session key */
726 SMBNTencrypt(ses->password, ses->server->cryptKey,
729 if (first_time) /* should this be moved into common code
730 with similar ntlmv2 path? */
731 cifs_calculate_session_key(&ses->server->session_key,
732 ntlm_session_key, ses->password);
733 /* copy session key */
735 memcpy(bcc_ptr, (char *)ntlm_session_key, CIFS_SESS_KEY_SIZE);
736 bcc_ptr += CIFS_SESS_KEY_SIZE;
737 memcpy(bcc_ptr, (char *)ntlm_session_key, CIFS_SESS_KEY_SIZE);
738 bcc_ptr += CIFS_SESS_KEY_SIZE;
739 if (ses->capabilities & CAP_UNICODE) {
740 /* unicode strings must be word aligned */
741 if (iov[0].iov_len % 2) {
745 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
747 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
748 } else if (type == NTLMv2) {
750 kmalloc(sizeof(struct ntlmv2_resp), GFP_KERNEL);
752 /* BB FIXME change all users of v2_sess_key to
753 struct ntlmv2_resp */
755 if (v2_sess_key == NULL) {
760 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
762 /* LM2 password would be here if we supported it */
763 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
764 /* cpu_to_le16(LM2_SESS_KEY_SIZE); */
766 pSMB->req_no_secext.CaseSensitivePasswordLength =
767 cpu_to_le16(sizeof(struct ntlmv2_resp));
769 /* calculate session key */
770 rc = setup_ntlmv2_rsp(ses, v2_sess_key, nls_cp);
775 /* FIXME: calculate MAC key */
776 memcpy(bcc_ptr, (char *)v2_sess_key,
777 sizeof(struct ntlmv2_resp));
778 bcc_ptr += sizeof(struct ntlmv2_resp);
780 if (ses->server->tilen > 0) {
781 memcpy(bcc_ptr, ses->server->tiblob,
783 bcc_ptr += ses->server->tilen;
785 if (ses->capabilities & CAP_UNICODE) {
786 if (iov[0].iov_len % 2) {
790 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
792 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
793 } else if (type == Kerberos) {
794 #ifdef CONFIG_CIFS_UPCALL
795 struct cifs_spnego_msg *msg;
796 spnego_key = cifs_get_spnego_key(ses);
797 if (IS_ERR(spnego_key)) {
798 rc = PTR_ERR(spnego_key);
803 msg = spnego_key->payload.data;
804 /* check version field to make sure that cifs.upcall is
805 sending us a response in an expected form */
806 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
807 cERROR(1, "incorrect version of cifs.upcall (expected"
809 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
813 /* bail out if key is too long */
814 if (msg->sesskey_len >
815 sizeof(ses->server->session_key.data.krb5)) {
816 cERROR(1, "Kerberos signing key too long (%u bytes)",
822 ses->server->session_key.len = msg->sesskey_len;
823 memcpy(ses->server->session_key.data.krb5,
824 msg->data, msg->sesskey_len);
826 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
827 capabilities |= CAP_EXTENDED_SECURITY;
828 pSMB->req.Capabilities = cpu_to_le32(capabilities);
829 iov[1].iov_base = msg->data + msg->sesskey_len;
830 iov[1].iov_len = msg->secblob_len;
831 pSMB->req.SecurityBlobLength = cpu_to_le16(iov[1].iov_len);
833 if (ses->capabilities & CAP_UNICODE) {
834 /* unicode strings must be word aligned */
835 if ((iov[0].iov_len + iov[1].iov_len) % 2) {
839 unicode_oslm_strings(&bcc_ptr, nls_cp);
840 unicode_domain_string(&bcc_ptr, ses, nls_cp);
842 /* BB: is this right? */
843 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
844 #else /* ! CONFIG_CIFS_UPCALL */
845 cERROR(1, "Kerberos negotiated but upcall support disabled!");
848 #endif /* CONFIG_CIFS_UPCALL */
850 #ifdef CONFIG_CIFS_EXPERIMENTAL
851 if (type == RawNTLMSSP) {
852 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
853 cERROR(1, "NTLMSSP requires Unicode support");
858 cFYI(1, "ntlmssp session setup phase %d", phase);
859 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
860 capabilities |= CAP_EXTENDED_SECURITY;
861 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
862 if (phase == NtLmNegotiate) {
863 setup_ntlmssp_neg_req(pSMB, ses);
864 iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
865 iov[1].iov_base = &pSMB->req.SecurityBlob[0];
866 } else if (phase == NtLmAuthenticate) {
868 ntlmsspblob = kmalloc(5 *
869 sizeof(struct _AUTHENTICATE_MESSAGE),
872 cERROR(1, "Can't allocate NTLMSSP");
877 blob_len = setup_ntlmssp_auth_req(ntlmsspblob,
881 iov[1].iov_len = blob_len;
882 iov[1].iov_base = ntlmsspblob;
883 pSMB->req.SecurityBlobLength =
884 cpu_to_le16(blob_len);
885 /* Make sure that we tell the server that we
886 are using the uid that it just gave us back
887 on the response (challenge) */
888 smb_buf->Uid = ses->Suid;
890 cERROR(1, "invalid phase %d", phase);
894 /* unicode strings must be word aligned */
895 if ((iov[0].iov_len + iov[1].iov_len) % 2) {
899 unicode_oslm_strings(&bcc_ptr, nls_cp);
901 cERROR(1, "secType %d not supported!", type);
906 cERROR(1, "secType %d not supported!", type);
912 iov[2].iov_base = str_area;
913 iov[2].iov_len = (long) bcc_ptr - (long) str_area;
915 count = iov[1].iov_len + iov[2].iov_len;
916 smb_buf->smb_buf_length += count;
918 BCC_LE(smb_buf) = cpu_to_le16(count);
920 rc = SendReceive2(xid, ses, iov, 3 /* num_iovecs */, &resp_buf_type,
921 CIFS_STD_OP /* not long */ | CIFS_LOG_ERROR);
922 /* SMB request buf freed in SendReceive2 */
924 cFYI(1, "ssetup rc from sendrecv2 is %d", rc);
926 pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base;
927 smb_buf = (struct smb_hdr *)iov[0].iov_base;
929 if ((type == RawNTLMSSP) && (smb_buf->Status.CifsError ==
930 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))) {
931 if (phase != NtLmNegotiate) {
932 cERROR(1, "Unexpected more processing error");
935 /* NTLMSSP Negotiate sent now processing challenge (response) */
936 phase = NtLmChallenge; /* process ntlmssp challenge */
937 rc = 0; /* MORE_PROC rc is not an error here, but expected */
942 if ((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) {
944 cERROR(1, "bad word count %d", smb_buf->WordCount);
947 action = le16_to_cpu(pSMB->resp.Action);
948 if (action & GUEST_LOGIN)
949 cFYI(1, "Guest login"); /* BB mark SesInfo struct? */
950 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
951 cFYI(1, "UID = %d ", ses->Suid);
952 /* response can have either 3 or 4 word count - Samba sends 3 */
953 /* and lanman response is 3 */
954 bytes_remaining = BCC(smb_buf);
955 bcc_ptr = pByteArea(smb_buf);
957 if (smb_buf->WordCount == 4) {
959 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
960 if (blob_len > bytes_remaining) {
961 cERROR(1, "bad security blob length %d", blob_len);
965 if (phase == NtLmChallenge) {
966 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
967 /* now goto beginning for ntlmssp authenticate phase */
972 bytes_remaining -= blob_len;
975 /* BB check if Unicode and decode strings */
976 if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
977 /* unicode string area must be word-aligned */
978 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
982 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, nls_cp);
984 rc = decode_ascii_ssetup(&bcc_ptr, bytes_remaining,
990 key_revoke(spnego_key);
994 if (resp_buf_type == CIFS_SMALL_BUFFER) {
995 cFYI(1, "ssetup freeing small buf %p", iov[0].iov_base);
996 cifs_small_buf_release(iov[0].iov_base);
997 } else if (resp_buf_type == CIFS_LARGE_BUFFER)
998 cifs_buf_release(iov[0].iov_base);
1000 /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
1001 if ((phase == NtLmChallenge) && (rc == 0))
1002 goto ssetup_ntlmssp_authenticate;