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->sign)
142 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
144 if (ses->capabilities & CAP_UNICODE) {
145 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
146 capabilities |= CAP_UNICODE;
148 if (ses->capabilities & CAP_STATUS32) {
149 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
150 capabilities |= CAP_STATUS32;
152 if (ses->capabilities & CAP_DFS) {
153 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
154 capabilities |= CAP_DFS;
156 if (ses->capabilities & CAP_UNIX)
157 capabilities |= CAP_UNIX;
163 unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
165 char *bcc_ptr = *pbcc_area;
168 /* Copy OS version */
169 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
171 bcc_ptr += 2 * bytes_ret;
172 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
174 bcc_ptr += 2 * bytes_ret;
175 bcc_ptr += 2; /* trailing null */
177 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
179 bcc_ptr += 2 * bytes_ret;
180 bcc_ptr += 2; /* trailing null */
182 *pbcc_area = bcc_ptr;
185 static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
186 const struct nls_table *nls_cp)
188 char *bcc_ptr = *pbcc_area;
192 if (ses->domainName == NULL) {
193 /* Sending null domain better than using a bogus domain name (as
194 we did briefly in 2.6.18) since server will use its default */
199 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
200 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
201 bcc_ptr += 2 * bytes_ret;
202 bcc_ptr += 2; /* account for null terminator */
204 *pbcc_area = bcc_ptr;
208 static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
209 const struct nls_table *nls_cp)
211 char *bcc_ptr = *pbcc_area;
214 /* BB FIXME add check that strings total less
215 than 335 or will need to send them as arrays */
217 /* unicode strings, must be word aligned before the call */
218 /* if ((long) bcc_ptr % 2) {
223 if (ses->user_name == NULL) {
224 /* null user mount */
228 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
229 CIFS_MAX_USERNAME_LEN, nls_cp);
231 bcc_ptr += 2 * bytes_ret;
232 bcc_ptr += 2; /* account for null termination */
234 unicode_domain_string(&bcc_ptr, ses, nls_cp);
235 unicode_oslm_strings(&bcc_ptr, nls_cp);
237 *pbcc_area = bcc_ptr;
240 static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
241 const struct nls_table *nls_cp)
243 char *bcc_ptr = *pbcc_area;
246 /* BB what about null user mounts - check that we do this BB */
248 if (ses->user_name != NULL) {
249 strncpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
250 bcc_ptr += strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
252 /* else null user mount */
254 bcc_ptr++; /* account for null termination */
257 if (ses->domainName != NULL) {
258 strncpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
259 bcc_ptr += strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
260 } /* else we will send a null domain name
261 so the server will default to its own domain */
265 /* BB check for overflow here */
267 strcpy(bcc_ptr, "Linux version ");
268 bcc_ptr += strlen("Linux version ");
269 strcpy(bcc_ptr, init_utsname()->release);
270 bcc_ptr += strlen(init_utsname()->release) + 1;
272 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
273 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
275 *pbcc_area = bcc_ptr;
279 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
280 const struct nls_table *nls_cp)
283 char *data = *pbcc_area;
285 cifs_dbg(FYI, "bleft %d\n", bleft);
287 kfree(ses->serverOS);
288 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
289 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
290 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
296 kfree(ses->serverNOS);
297 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
298 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
299 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
305 kfree(ses->serverDomain);
306 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
307 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
312 static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
313 struct cifs_ses *ses,
314 const struct nls_table *nls_cp)
317 char *bcc_ptr = *pbcc_area;
319 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
321 len = strnlen(bcc_ptr, bleft);
325 kfree(ses->serverOS);
327 ses->serverOS = kzalloc(len + 1, GFP_KERNEL);
329 strncpy(ses->serverOS, bcc_ptr, len);
330 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
331 cifs_dbg(FYI, "OS/2 server\n");
336 len = strnlen(bcc_ptr, bleft);
340 kfree(ses->serverNOS);
342 ses->serverNOS = kzalloc(len + 1, GFP_KERNEL);
344 strncpy(ses->serverNOS, bcc_ptr, len);
349 len = strnlen(bcc_ptr, bleft);
353 /* No domain field in LANMAN case. Domain is
354 returned by old servers in the SMB negprot response */
355 /* BB For newer servers which do not support Unicode,
356 but thus do return domain here we could add parsing
357 for it later, but it is not very important */
358 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
361 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
362 struct cifs_ses *ses)
364 unsigned int tioffset; /* challenge message target info area */
365 unsigned int tilen; /* challenge message target info area length */
367 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
369 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
370 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
374 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
375 cifs_dbg(VFS, "blob signature incorrect %s\n",
379 if (pblob->MessageType != NtLmChallenge) {
380 cifs_dbg(VFS, "Incorrect message type %d\n",
385 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
386 /* BB we could decode pblob->NegotiateFlags; some may be useful */
387 /* In particular we can examine sign flags */
388 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
389 we must set the MIC field of the AUTHENTICATE_MESSAGE */
390 ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags);
391 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
392 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
393 if (tioffset > blob_len || tioffset + tilen > blob_len) {
394 cifs_dbg(VFS, "tioffset + tilen too high %u + %u",
399 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
401 if (!ses->auth_key.response) {
402 cifs_dbg(VFS, "Challenge target info alloc failure");
405 ses->auth_key.len = tilen;
411 /* BB Move to ntlmssp.c eventually */
413 /* We do not malloc the blob, it is passed in pbuffer, because
414 it is fixed size, and small, making this approach cleaner */
415 void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
416 struct cifs_ses *ses)
418 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer;
421 memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
422 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
423 sec_blob->MessageType = NtLmNegotiate;
425 /* BB is NTLMV2 session security format easier to use here? */
426 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
427 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
428 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
429 if (ses->server->sign) {
430 flags |= NTLMSSP_NEGOTIATE_SIGN;
431 if (!ses->server->session_estab ||
432 ses->ntlmssp->sesskey_per_smbsess)
433 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
436 sec_blob->NegotiateFlags = cpu_to_le32(flags);
438 sec_blob->WorkstationName.BufferOffset = 0;
439 sec_blob->WorkstationName.Length = 0;
440 sec_blob->WorkstationName.MaximumLength = 0;
442 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
443 sec_blob->DomainName.BufferOffset = 0;
444 sec_blob->DomainName.Length = 0;
445 sec_blob->DomainName.MaximumLength = 0;
448 /* We do not malloc the blob, it is passed in pbuffer, because its
449 maximum possible size is fixed and small, making this approach cleaner.
450 This function returns the length of the data in the blob */
451 int build_ntlmssp_auth_blob(unsigned char *pbuffer,
453 struct cifs_ses *ses,
454 const struct nls_table *nls_cp)
457 AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer;
461 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
462 sec_blob->MessageType = NtLmAuthenticate;
464 flags = NTLMSSP_NEGOTIATE_56 |
465 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
466 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
467 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
468 if (ses->server->sign) {
469 flags |= NTLMSSP_NEGOTIATE_SIGN;
470 if (!ses->server->session_estab ||
471 ses->ntlmssp->sesskey_per_smbsess)
472 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
475 tmp = pbuffer + sizeof(AUTHENTICATE_MESSAGE);
476 sec_blob->NegotiateFlags = cpu_to_le32(flags);
478 sec_blob->LmChallengeResponse.BufferOffset =
479 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
480 sec_blob->LmChallengeResponse.Length = 0;
481 sec_blob->LmChallengeResponse.MaximumLength = 0;
483 sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer);
484 rc = setup_ntlmv2_rsp(ses, nls_cp);
486 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
487 goto setup_ntlmv2_ret;
489 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
490 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
491 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
493 sec_blob->NtChallengeResponse.Length =
494 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
495 sec_blob->NtChallengeResponse.MaximumLength =
496 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
498 if (ses->domainName == NULL) {
499 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
500 sec_blob->DomainName.Length = 0;
501 sec_blob->DomainName.MaximumLength = 0;
505 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
506 CIFS_MAX_USERNAME_LEN, nls_cp);
507 len *= 2; /* unicode is 2 bytes each */
508 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
509 sec_blob->DomainName.Length = cpu_to_le16(len);
510 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
514 if (ses->user_name == NULL) {
515 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
516 sec_blob->UserName.Length = 0;
517 sec_blob->UserName.MaximumLength = 0;
521 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
522 CIFS_MAX_USERNAME_LEN, nls_cp);
523 len *= 2; /* unicode is 2 bytes each */
524 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
525 sec_blob->UserName.Length = cpu_to_le16(len);
526 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
530 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - pbuffer);
531 sec_blob->WorkstationName.Length = 0;
532 sec_blob->WorkstationName.MaximumLength = 0;
535 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
536 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
537 && !calc_seckey(ses)) {
538 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
539 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
540 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
541 sec_blob->SessionKey.MaximumLength =
542 cpu_to_le16(CIFS_CPHTXT_SIZE);
543 tmp += CIFS_CPHTXT_SIZE;
545 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
546 sec_blob->SessionKey.Length = 0;
547 sec_blob->SessionKey.MaximumLength = 0;
551 *buflen = tmp - pbuffer;
556 select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
558 switch (server->negflavor) {
559 case CIFS_NEGFLAVOR_EXTENDED:
565 if (server->sec_ntlmssp &&
566 (global_secflags & CIFSSEC_MAY_NTLMSSP))
568 if ((server->sec_kerberos || server->sec_mskerberos) &&
569 (global_secflags & CIFSSEC_MAY_KRB5))
575 case CIFS_NEGFLAVOR_UNENCAP:
581 if (global_secflags & CIFSSEC_MAY_NTLMV2)
583 if (global_secflags & CIFSSEC_MAY_NTLM)
589 case CIFS_NEGFLAVOR_LANMAN:
594 if (global_secflags & CIFSSEC_MAY_LANMAN)
606 CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
607 const struct nls_table *nls_cp)
611 struct smb_hdr *smb_buf;
614 SESSION_SETUP_ANDX *pSMB;
619 enum securityEnum type;
620 __u16 action, bytes_remaining;
621 struct key *spnego_key = NULL;
622 __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
624 char *ntlmsspblob = NULL;
627 WARN(1, "%s: ses == NULL!", __func__);
631 type = select_sectype(ses->server, ses->sectype);
632 cifs_dbg(FYI, "sess setup type %d\n", type);
633 if (type == Unspecified) {
635 "Unable to select appropriate authentication method!");
639 if (type == RawNTLMSSP) {
640 /* if memory allocation is successful, caller of this function
643 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
646 ses->ntlmssp->sesskey_per_smbsess = false;
650 ssetup_ntlmssp_authenticate:
651 if (phase == NtLmChallenge)
652 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
654 if (type == LANMAN) {
655 #ifndef CONFIG_CIFS_WEAK_PW_HASH
656 /* LANMAN and plaintext are less secure and off by default.
657 So we make this explicitly be turned on in kconfig (in the
658 build) and turned on at runtime (changed from the default)
659 in proc/fs/cifs or via mount parm. Unfortunately this is
660 needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
663 wct = 10; /* lanman 2 style sessionsetup */
664 } else if ((type == NTLM) || (type == NTLMv2)) {
665 /* For NTLMv2 failures eventually may need to retry NTLM */
666 wct = 13; /* old style NTLM sessionsetup */
667 } else /* same size: negotiate or auth, NTLMSSP or extended security */
670 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
675 pSMB = (SESSION_SETUP_ANDX *)smb_buf;
677 capabilities = cifs_ssetup_hdr(ses, pSMB);
679 /* we will send the SMB in three pieces:
680 a fixed length beginning part, an optional
681 SPNEGO blob (which can be zero length), and a
682 last part which will include the strings
683 and rest of bcc area. This allows us to avoid
684 a large buffer 17K allocation */
685 iov[0].iov_base = (char *)pSMB;
686 iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
688 /* setting this here allows the code at the end of the function
689 to free the request buffer if there's an error */
690 resp_buf_type = CIFS_SMALL_BUFFER;
692 /* 2000 big enough to fit max user, domain, NOS name etc. */
693 str_area = kmalloc(2000, GFP_KERNEL);
694 if (str_area == NULL) {
700 iov[1].iov_base = NULL;
703 if (type == LANMAN) {
704 #ifdef CONFIG_CIFS_WEAK_PW_HASH
705 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
707 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
709 /* no capabilities flags in old lanman negotiation */
711 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
713 /* Calculate hash with password and copy into bcc_ptr.
714 * Encryption Key (stored as in cryptkey) gets used if the
715 * security mode bit in Negottiate Protocol response states
716 * to use challenge/response method (i.e. Password bit is 1).
719 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
720 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
721 true : false, lnm_session_key);
723 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
724 bcc_ptr += CIFS_AUTH_RESP_SIZE;
726 /* can not sign if LANMAN negotiated so no need
727 to calculate signing key? but what if server
728 changed to do higher than lanman dialect and
729 we reconnected would we ever calc signing_key? */
731 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
732 /* Unicode not allowed for LANMAN dialects */
733 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
735 } else if (type == NTLM) {
736 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
737 pSMB->req_no_secext.CaseInsensitivePasswordLength =
738 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
739 pSMB->req_no_secext.CaseSensitivePasswordLength =
740 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
742 /* calculate ntlm response and session key */
743 rc = setup_ntlm_response(ses, nls_cp);
745 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
750 /* copy ntlm response */
751 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
752 CIFS_AUTH_RESP_SIZE);
753 bcc_ptr += CIFS_AUTH_RESP_SIZE;
754 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
755 CIFS_AUTH_RESP_SIZE);
756 bcc_ptr += CIFS_AUTH_RESP_SIZE;
758 if (ses->capabilities & CAP_UNICODE) {
759 /* unicode strings must be word aligned */
760 if (iov[0].iov_len % 2) {
764 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
766 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
767 } else if (type == NTLMv2) {
768 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
770 /* LM2 password would be here if we supported it */
771 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
773 /* calculate nlmv2 response and session key */
774 rc = setup_ntlmv2_rsp(ses, nls_cp);
776 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n",
780 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
781 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
782 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
784 /* set case sensitive password length after tilen may get
785 * assigned, tilen is 0 otherwise.
787 pSMB->req_no_secext.CaseSensitivePasswordLength =
788 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
790 if (ses->capabilities & CAP_UNICODE) {
791 if (iov[0].iov_len % 2) {
795 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
797 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
798 } else if (type == Kerberos) {
799 #ifdef CONFIG_CIFS_UPCALL
800 struct cifs_spnego_msg *msg;
802 spnego_key = cifs_get_spnego_key(ses);
803 if (IS_ERR(spnego_key)) {
804 rc = PTR_ERR(spnego_key);
809 msg = spnego_key->payload.data;
810 /* check version field to make sure that cifs.upcall is
811 sending us a response in an expected form */
812 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
813 cifs_dbg(VFS, "incorrect version of cifs.upcall "
814 "expected %d but got %d)",
815 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
820 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
822 if (!ses->auth_key.response) {
824 "Kerberos can't allocate (%u bytes) memory",
829 ses->auth_key.len = msg->sesskey_len;
831 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
832 capabilities |= CAP_EXTENDED_SECURITY;
833 pSMB->req.Capabilities = cpu_to_le32(capabilities);
834 iov[1].iov_base = msg->data + msg->sesskey_len;
835 iov[1].iov_len = msg->secblob_len;
836 pSMB->req.SecurityBlobLength = cpu_to_le16(iov[1].iov_len);
838 if (ses->capabilities & CAP_UNICODE) {
839 /* unicode strings must be word aligned */
840 if ((iov[0].iov_len + iov[1].iov_len) % 2) {
844 unicode_oslm_strings(&bcc_ptr, nls_cp);
845 unicode_domain_string(&bcc_ptr, ses, nls_cp);
847 /* BB: is this right? */
848 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
849 #else /* ! CONFIG_CIFS_UPCALL */
850 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
853 #endif /* CONFIG_CIFS_UPCALL */
854 } else if (type == RawNTLMSSP) {
855 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
856 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
861 cifs_dbg(FYI, "ntlmssp session setup phase %d\n", phase);
862 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
863 capabilities |= CAP_EXTENDED_SECURITY;
864 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
867 build_ntlmssp_negotiate_blob(
868 pSMB->req.SecurityBlob, ses);
869 iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
870 iov[1].iov_base = pSMB->req.SecurityBlob;
871 pSMB->req.SecurityBlobLength =
872 cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
874 case NtLmAuthenticate:
876 * 5 is an empirical value, large enough to hold
877 * authenticate message plus max 10 of av paris,
878 * domain, user, workstation names, flags, etc.
880 ntlmsspblob = kzalloc(
881 5*sizeof(struct _AUTHENTICATE_MESSAGE),
888 rc = build_ntlmssp_auth_blob(ntlmsspblob,
889 &blob_len, ses, nls_cp);
892 iov[1].iov_len = blob_len;
893 iov[1].iov_base = ntlmsspblob;
894 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
896 * Make sure that we tell the server that we are using
897 * the uid that it just gave us back on the response
900 smb_buf->Uid = ses->Suid;
903 cifs_dbg(VFS, "invalid phase %d\n", phase);
907 /* unicode strings must be word aligned */
908 if ((iov[0].iov_len + iov[1].iov_len) % 2) {
912 unicode_oslm_strings(&bcc_ptr, nls_cp);
914 cifs_dbg(VFS, "secType %d not supported!\n", type);
919 iov[2].iov_base = str_area;
920 iov[2].iov_len = (long) bcc_ptr - (long) str_area;
922 count = iov[1].iov_len + iov[2].iov_len;
923 smb_buf->smb_buf_length =
924 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
926 put_bcc(count, smb_buf);
928 rc = SendReceive2(xid, ses, iov, 3 /* num_iovecs */, &resp_buf_type,
930 /* SMB request buf freed in SendReceive2 */
932 pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base;
933 smb_buf = (struct smb_hdr *)iov[0].iov_base;
935 if ((type == RawNTLMSSP) && (resp_buf_type != CIFS_NO_BUFFER) &&
936 (smb_buf->Status.CifsError ==
937 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))) {
938 if (phase != NtLmNegotiate) {
939 cifs_dbg(VFS, "Unexpected more processing error\n");
942 /* NTLMSSP Negotiate sent now processing challenge (response) */
943 phase = NtLmChallenge; /* process ntlmssp challenge */
944 rc = 0; /* MORE_PROC rc is not an error here, but expected */
949 if ((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) {
951 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
954 action = le16_to_cpu(pSMB->resp.Action);
955 if (action & GUEST_LOGIN)
956 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
957 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
958 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
959 /* response can have either 3 or 4 word count - Samba sends 3 */
960 /* and lanman response is 3 */
961 bytes_remaining = get_bcc(smb_buf);
962 bcc_ptr = pByteArea(smb_buf);
964 if (smb_buf->WordCount == 4) {
965 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
966 if (blob_len > bytes_remaining) {
967 cifs_dbg(VFS, "bad security blob length %d\n",
972 if (phase == NtLmChallenge) {
973 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
974 /* now goto beginning for ntlmssp authenticate phase */
979 bytes_remaining -= blob_len;
982 /* BB check if Unicode and decode strings */
983 if (bytes_remaining == 0) {
984 /* no string area to decode, do nothing */
985 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
986 /* unicode string area must be word-aligned */
987 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
991 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, nls_cp);
993 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, nls_cp);
998 key_invalidate(spnego_key);
1004 if (resp_buf_type == CIFS_SMALL_BUFFER) {
1005 cifs_dbg(FYI, "ssetup freeing small buf %p\n", iov[0].iov_base);
1006 cifs_small_buf_release(iov[0].iov_base);
1007 } else if (resp_buf_type == CIFS_LARGE_BUFFER)
1008 cifs_buf_release(iov[0].iov_base);
1010 /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
1011 if ((phase == NtLmChallenge) && (rc == 0))
1012 goto ssetup_ntlmssp_authenticate;
1015 mutex_lock(&ses->server->srv_mutex);
1016 if (!ses->server->session_estab) {
1017 if (ses->server->sign) {
1018 ses->server->session_key.response =
1019 kmemdup(ses->auth_key.response,
1020 ses->auth_key.len, GFP_KERNEL);
1021 if (!ses->server->session_key.response) {
1023 mutex_unlock(&ses->server->srv_mutex);
1026 ses->server->session_key.len =
1029 ses->server->sequence_number = 0x2;
1030 ses->server->session_estab = true;
1032 mutex_unlock(&ses->server->srv_mutex);
1034 cifs_dbg(FYI, "CIFS session established successfully\n");
1035 spin_lock(&GlobalMid_Lock);
1036 ses->status = CifsGood;
1037 ses->need_reconnect = false;
1038 spin_unlock(&GlobalMid_Lock);
1042 kfree(ses->auth_key.response);
1043 ses->auth_key.response = NULL;
1044 kfree(ses->ntlmssp);