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;
164 /* BB what about null user mounts - check that we do this BB */
166 if (ses->user_name != NULL) {
167 strncpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
168 bcc_ptr += strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
170 /* else null user mount */
172 bcc_ptr++; /* account for null termination */
175 if (ses->domainName != NULL) {
176 strncpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
177 bcc_ptr += strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
178 } /* else we will send a null domain name
179 so the server will default to its own domain */
183 /* BB check for overflow here */
185 strcpy(bcc_ptr, "Linux version ");
186 bcc_ptr += strlen("Linux version ");
187 strcpy(bcc_ptr, init_utsname()->release);
188 bcc_ptr += strlen(init_utsname()->release) + 1;
190 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
191 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
193 *pbcc_area = bcc_ptr;
197 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
198 const struct nls_table *nls_cp)
201 char *data = *pbcc_area;
203 cifs_dbg(FYI, "bleft %d\n", bleft);
205 kfree(ses->serverOS);
206 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
207 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
208 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
214 kfree(ses->serverNOS);
215 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
216 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
217 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
223 kfree(ses->serverDomain);
224 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
225 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
230 static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
231 struct cifs_ses *ses,
232 const struct nls_table *nls_cp)
235 char *bcc_ptr = *pbcc_area;
237 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
239 len = strnlen(bcc_ptr, bleft);
243 kfree(ses->serverOS);
245 ses->serverOS = kzalloc(len + 1, GFP_KERNEL);
247 strncpy(ses->serverOS, bcc_ptr, len);
248 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
249 cifs_dbg(FYI, "OS/2 server\n");
255 len = strnlen(bcc_ptr, bleft);
259 kfree(ses->serverNOS);
261 ses->serverNOS = kzalloc(len + 1, GFP_KERNEL);
263 strncpy(ses->serverNOS, bcc_ptr, len);
268 len = strnlen(bcc_ptr, bleft);
272 /* No domain field in LANMAN case. Domain is
273 returned by old servers in the SMB negprot response */
274 /* BB For newer servers which do not support Unicode,
275 but thus do return domain here we could add parsing
276 for it later, but it is not very important */
277 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
280 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
281 struct cifs_ses *ses)
283 unsigned int tioffset; /* challenge message target info area */
284 unsigned int tilen; /* challenge message target info area length */
286 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
288 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
289 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
293 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
294 cifs_dbg(VFS, "blob signature incorrect %s\n",
298 if (pblob->MessageType != NtLmChallenge) {
299 cifs_dbg(VFS, "Incorrect message type %d\n",
304 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
305 /* BB we could decode pblob->NegotiateFlags; some may be useful */
306 /* In particular we can examine sign flags */
307 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
308 we must set the MIC field of the AUTHENTICATE_MESSAGE */
309 ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags);
310 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
311 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
312 if (tioffset > blob_len || tioffset + tilen > blob_len) {
313 cifs_dbg(VFS, "tioffset + tilen too high %u + %u",
318 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
320 if (!ses->auth_key.response) {
321 cifs_dbg(VFS, "Challenge target info alloc failure");
324 ses->auth_key.len = tilen;
330 /* BB Move to ntlmssp.c eventually */
332 /* We do not malloc the blob, it is passed in pbuffer, because
333 it is fixed size, and small, making this approach cleaner */
334 void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
335 struct cifs_ses *ses)
337 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer;
340 memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
341 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
342 sec_blob->MessageType = NtLmNegotiate;
344 /* BB is NTLMV2 session security format easier to use here? */
345 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
346 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
347 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
348 if (ses->server->sign) {
349 flags |= NTLMSSP_NEGOTIATE_SIGN;
350 if (!ses->server->session_estab ||
351 ses->ntlmssp->sesskey_per_smbsess)
352 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
355 sec_blob->NegotiateFlags = cpu_to_le32(flags);
357 sec_blob->WorkstationName.BufferOffset = 0;
358 sec_blob->WorkstationName.Length = 0;
359 sec_blob->WorkstationName.MaximumLength = 0;
361 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
362 sec_blob->DomainName.BufferOffset = 0;
363 sec_blob->DomainName.Length = 0;
364 sec_blob->DomainName.MaximumLength = 0;
367 static int size_of_ntlmssp_blob(struct cifs_ses *ses)
369 int sz = sizeof(AUTHENTICATE_MESSAGE) + ses->auth_key.len
370 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
373 sz += 2 * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
378 sz += 2 * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
385 int build_ntlmssp_auth_blob(unsigned char **pbuffer,
387 struct cifs_ses *ses,
388 const struct nls_table *nls_cp)
391 AUTHENTICATE_MESSAGE *sec_blob;
395 rc = setup_ntlmv2_rsp(ses, nls_cp);
397 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
399 goto setup_ntlmv2_ret;
401 *pbuffer = kmalloc(size_of_ntlmssp_blob(ses), GFP_KERNEL);
402 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
404 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
405 sec_blob->MessageType = NtLmAuthenticate;
407 flags = NTLMSSP_NEGOTIATE_56 |
408 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
409 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
410 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
411 if (ses->server->sign) {
412 flags |= NTLMSSP_NEGOTIATE_SIGN;
413 if (!ses->server->session_estab ||
414 ses->ntlmssp->sesskey_per_smbsess)
415 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
418 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
419 sec_blob->NegotiateFlags = cpu_to_le32(flags);
421 sec_blob->LmChallengeResponse.BufferOffset =
422 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
423 sec_blob->LmChallengeResponse.Length = 0;
424 sec_blob->LmChallengeResponse.MaximumLength = 0;
426 sec_blob->NtChallengeResponse.BufferOffset =
427 cpu_to_le32(tmp - *pbuffer);
428 if (ses->user_name != NULL) {
429 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
430 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
431 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
433 sec_blob->NtChallengeResponse.Length =
434 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
435 sec_blob->NtChallengeResponse.MaximumLength =
436 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
439 * don't send an NT Response for anonymous access
441 sec_blob->NtChallengeResponse.Length = 0;
442 sec_blob->NtChallengeResponse.MaximumLength = 0;
445 if (ses->domainName == NULL) {
446 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
447 sec_blob->DomainName.Length = 0;
448 sec_blob->DomainName.MaximumLength = 0;
452 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
453 CIFS_MAX_USERNAME_LEN, nls_cp);
454 len *= 2; /* unicode is 2 bytes each */
455 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
456 sec_blob->DomainName.Length = cpu_to_le16(len);
457 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
461 if (ses->user_name == NULL) {
462 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
463 sec_blob->UserName.Length = 0;
464 sec_blob->UserName.MaximumLength = 0;
468 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
469 CIFS_MAX_USERNAME_LEN, nls_cp);
470 len *= 2; /* unicode is 2 bytes each */
471 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
472 sec_blob->UserName.Length = cpu_to_le16(len);
473 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
477 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
478 sec_blob->WorkstationName.Length = 0;
479 sec_blob->WorkstationName.MaximumLength = 0;
482 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
483 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
484 && !calc_seckey(ses)) {
485 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
486 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
487 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
488 sec_blob->SessionKey.MaximumLength =
489 cpu_to_le16(CIFS_CPHTXT_SIZE);
490 tmp += CIFS_CPHTXT_SIZE;
492 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
493 sec_blob->SessionKey.Length = 0;
494 sec_blob->SessionKey.MaximumLength = 0;
497 *buflen = tmp - *pbuffer;
503 select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
505 switch (server->negflavor) {
506 case CIFS_NEGFLAVOR_EXTENDED:
512 if (server->sec_ntlmssp &&
513 (global_secflags & CIFSSEC_MAY_NTLMSSP))
515 if ((server->sec_kerberos || server->sec_mskerberos) &&
516 (global_secflags & CIFSSEC_MAY_KRB5))
522 case CIFS_NEGFLAVOR_UNENCAP:
528 if (global_secflags & CIFSSEC_MAY_NTLMV2)
530 if (global_secflags & CIFSSEC_MAY_NTLM)
533 /* Fallthrough to attempt LANMAN authentication next */
536 case CIFS_NEGFLAVOR_LANMAN:
541 if (global_secflags & CIFSSEC_MAY_LANMAN)
554 struct cifs_ses *ses;
555 struct nls_table *nls_cp;
556 void (*func)(struct sess_data *);
559 /* we will send the SMB in three pieces:
560 * a fixed length beginning part, an optional
561 * SPNEGO blob (which can be zero length), and a
562 * last part which will include the strings
563 * and rest of bcc area. This allows us to avoid
564 * a large buffer 17K allocation
571 sess_alloc_buffer(struct sess_data *sess_data, int wct)
574 struct cifs_ses *ses = sess_data->ses;
575 struct smb_hdr *smb_buf;
577 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
583 sess_data->iov[0].iov_base = (char *)smb_buf;
584 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
586 * This variable will be used to clear the buffer
587 * allocated above in case of any error in the calling function.
589 sess_data->buf0_type = CIFS_SMALL_BUFFER;
591 /* 2000 big enough to fit max user, domain, NOS name etc. */
592 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
593 if (!sess_data->iov[2].iov_base) {
595 goto out_free_smb_buf;
602 sess_data->iov[0].iov_base = NULL;
603 sess_data->iov[0].iov_len = 0;
604 sess_data->buf0_type = CIFS_NO_BUFFER;
609 sess_free_buffer(struct sess_data *sess_data)
612 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
613 sess_data->buf0_type = CIFS_NO_BUFFER;
614 kfree(sess_data->iov[2].iov_base);
618 sess_establish_session(struct sess_data *sess_data)
620 struct cifs_ses *ses = sess_data->ses;
622 mutex_lock(&ses->server->srv_mutex);
623 if (!ses->server->session_estab) {
624 if (ses->server->sign) {
625 ses->server->session_key.response =
626 kmemdup(ses->auth_key.response,
627 ses->auth_key.len, GFP_KERNEL);
628 if (!ses->server->session_key.response) {
629 mutex_unlock(&ses->server->srv_mutex);
632 ses->server->session_key.len =
635 ses->server->sequence_number = 0x2;
636 ses->server->session_estab = true;
638 mutex_unlock(&ses->server->srv_mutex);
640 cifs_dbg(FYI, "CIFS session established successfully\n");
641 spin_lock(&GlobalMid_Lock);
642 ses->status = CifsGood;
643 ses->need_reconnect = false;
644 spin_unlock(&GlobalMid_Lock);
650 sess_sendreceive(struct sess_data *sess_data)
653 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
656 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
657 smb_buf->smb_buf_length =
658 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
659 put_bcc(count, smb_buf);
661 rc = SendReceive2(sess_data->xid, sess_data->ses,
662 sess_data->iov, 3 /* num_iovecs */,
663 &sess_data->buf0_type,
670 * LANMAN and plaintext are less secure and off by default.
671 * So we make this explicitly be turned on in kconfig (in the
672 * build) and turned on at runtime (changed from the default)
673 * in proc/fs/cifs or via mount parm. Unfortunately this is
674 * needed for old Win (e.g. Win95), some obscure NAS and OS/2
676 #ifdef CONFIG_CIFS_WEAK_PW_HASH
678 sess_auth_lanman(struct sess_data *sess_data)
681 struct smb_hdr *smb_buf;
682 SESSION_SETUP_ANDX *pSMB;
684 struct cifs_ses *ses = sess_data->ses;
685 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
687 __u16 bytes_remaining;
689 /* lanman 2 style sessionsetup */
691 rc = sess_alloc_buffer(sess_data, 10);
695 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
696 bcc_ptr = sess_data->iov[2].iov_base;
697 capabilities = cifs_ssetup_hdr(ses, pSMB);
699 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
701 if (ses->user_name != NULL) {
702 /* no capabilities flags in old lanman negotiation */
703 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
705 /* Calculate hash with password and copy into bcc_ptr.
706 * Encryption Key (stored as in cryptkey) gets used if the
707 * security mode bit in Negottiate Protocol response states
708 * to use challenge/response method (i.e. Password bit is 1).
710 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
711 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
712 true : false, lnm_session_key);
714 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
715 bcc_ptr += CIFS_AUTH_RESP_SIZE;
717 pSMB->old_req.PasswordLength = 0;
721 * can not sign if LANMAN negotiated so no need
722 * to calculate signing key? but what if server
723 * changed to do higher than lanman dialect and
724 * we reconnected would we ever calc signing_key?
727 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
728 /* Unicode not allowed for LANMAN dialects */
729 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
731 sess_data->iov[2].iov_len = (long) bcc_ptr -
732 (long) sess_data->iov[2].iov_base;
734 rc = sess_sendreceive(sess_data);
738 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
739 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
741 /* lanman response has a word count of 3 */
742 if (smb_buf->WordCount != 3) {
744 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
748 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
749 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
751 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
752 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
754 bytes_remaining = get_bcc(smb_buf);
755 bcc_ptr = pByteArea(smb_buf);
757 /* BB check if Unicode and decode strings */
758 if (bytes_remaining == 0) {
759 /* no string area to decode, do nothing */
760 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
761 /* unicode string area must be word-aligned */
762 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
766 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
769 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
773 rc = sess_establish_session(sess_data);
775 sess_data->result = rc;
776 sess_data->func = NULL;
777 sess_free_buffer(sess_data);
783 sess_auth_ntlm(struct sess_data *sess_data)
786 struct smb_hdr *smb_buf;
787 SESSION_SETUP_ANDX *pSMB;
789 struct cifs_ses *ses = sess_data->ses;
791 __u16 bytes_remaining;
793 /* old style NTLM sessionsetup */
795 rc = sess_alloc_buffer(sess_data, 13);
799 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
800 bcc_ptr = sess_data->iov[2].iov_base;
801 capabilities = cifs_ssetup_hdr(ses, pSMB);
803 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
804 if (ses->user_name != NULL) {
805 pSMB->req_no_secext.CaseInsensitivePasswordLength =
806 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
807 pSMB->req_no_secext.CaseSensitivePasswordLength =
808 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
810 /* calculate ntlm response and session key */
811 rc = setup_ntlm_response(ses, sess_data->nls_cp);
813 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
818 /* copy ntlm response */
819 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
820 CIFS_AUTH_RESP_SIZE);
821 bcc_ptr += CIFS_AUTH_RESP_SIZE;
822 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
823 CIFS_AUTH_RESP_SIZE);
824 bcc_ptr += CIFS_AUTH_RESP_SIZE;
826 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
827 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
830 if (ses->capabilities & CAP_UNICODE) {
831 /* unicode strings must be word aligned */
832 if (sess_data->iov[0].iov_len % 2) {
836 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
838 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
842 sess_data->iov[2].iov_len = (long) bcc_ptr -
843 (long) sess_data->iov[2].iov_base;
845 rc = sess_sendreceive(sess_data);
849 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
850 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
852 if (smb_buf->WordCount != 3) {
854 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
858 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
859 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
861 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
862 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
864 bytes_remaining = get_bcc(smb_buf);
865 bcc_ptr = pByteArea(smb_buf);
867 /* BB check if Unicode and decode strings */
868 if (bytes_remaining == 0) {
869 /* no string area to decode, do nothing */
870 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
871 /* unicode string area must be word-aligned */
872 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
876 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
879 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
883 rc = sess_establish_session(sess_data);
885 sess_data->result = rc;
886 sess_data->func = NULL;
887 sess_free_buffer(sess_data);
888 kfree(ses->auth_key.response);
889 ses->auth_key.response = NULL;
893 sess_auth_ntlmv2(struct sess_data *sess_data)
896 struct smb_hdr *smb_buf;
897 SESSION_SETUP_ANDX *pSMB;
899 struct cifs_ses *ses = sess_data->ses;
901 __u16 bytes_remaining;
903 /* old style NTLM sessionsetup */
905 rc = sess_alloc_buffer(sess_data, 13);
909 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
910 bcc_ptr = sess_data->iov[2].iov_base;
911 capabilities = cifs_ssetup_hdr(ses, pSMB);
913 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
915 /* LM2 password would be here if we supported it */
916 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
918 if (ses->user_name != NULL) {
919 /* calculate nlmv2 response and session key */
920 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
922 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
926 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
927 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
928 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
930 /* set case sensitive password length after tilen may get
931 * assigned, tilen is 0 otherwise.
933 pSMB->req_no_secext.CaseSensitivePasswordLength =
934 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
936 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
939 if (ses->capabilities & CAP_UNICODE) {
940 if (sess_data->iov[0].iov_len % 2) {
944 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
946 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
950 sess_data->iov[2].iov_len = (long) bcc_ptr -
951 (long) sess_data->iov[2].iov_base;
953 rc = sess_sendreceive(sess_data);
957 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
958 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
960 if (smb_buf->WordCount != 3) {
962 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
966 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
967 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
969 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
970 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
972 bytes_remaining = get_bcc(smb_buf);
973 bcc_ptr = pByteArea(smb_buf);
975 /* BB check if Unicode and decode strings */
976 if (bytes_remaining == 0) {
977 /* no string area to decode, do nothing */
978 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
979 /* unicode string area must be word-aligned */
980 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
984 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
987 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
991 rc = sess_establish_session(sess_data);
993 sess_data->result = rc;
994 sess_data->func = NULL;
995 sess_free_buffer(sess_data);
996 kfree(ses->auth_key.response);
997 ses->auth_key.response = NULL;
1000 #ifdef CONFIG_CIFS_UPCALL
1002 sess_auth_kerberos(struct sess_data *sess_data)
1005 struct smb_hdr *smb_buf;
1006 SESSION_SETUP_ANDX *pSMB;
1008 struct cifs_ses *ses = sess_data->ses;
1010 __u16 bytes_remaining;
1011 struct key *spnego_key = NULL;
1012 struct cifs_spnego_msg *msg;
1015 /* extended security */
1017 rc = sess_alloc_buffer(sess_data, 12);
1021 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1022 bcc_ptr = sess_data->iov[2].iov_base;
1023 capabilities = cifs_ssetup_hdr(ses, pSMB);
1025 spnego_key = cifs_get_spnego_key(ses);
1026 if (IS_ERR(spnego_key)) {
1027 rc = PTR_ERR(spnego_key);
1032 msg = spnego_key->payload.data[0];
1034 * check version field to make sure that cifs.upcall is
1035 * sending us a response in an expected form
1037 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1039 "incorrect version of cifs.upcall (expected %d but got %d)",
1040 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1042 goto out_put_spnego_key;
1045 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1047 if (!ses->auth_key.response) {
1048 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory",
1051 goto out_put_spnego_key;
1053 ses->auth_key.len = msg->sesskey_len;
1055 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1056 capabilities |= CAP_EXTENDED_SECURITY;
1057 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1058 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1059 sess_data->iov[1].iov_len = msg->secblob_len;
1060 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1062 if (ses->capabilities & CAP_UNICODE) {
1063 /* unicode strings must be word aligned */
1064 if ((sess_data->iov[0].iov_len
1065 + sess_data->iov[1].iov_len) % 2) {
1069 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1070 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1072 /* BB: is this right? */
1073 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1076 sess_data->iov[2].iov_len = (long) bcc_ptr -
1077 (long) sess_data->iov[2].iov_base;
1079 rc = sess_sendreceive(sess_data);
1081 goto out_put_spnego_key;
1083 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1084 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1086 if (smb_buf->WordCount != 4) {
1088 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1089 goto out_put_spnego_key;
1092 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1093 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1095 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1096 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1098 bytes_remaining = get_bcc(smb_buf);
1099 bcc_ptr = pByteArea(smb_buf);
1101 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1102 if (blob_len > bytes_remaining) {
1103 cifs_dbg(VFS, "bad security blob length %d\n",
1106 goto out_put_spnego_key;
1108 bcc_ptr += blob_len;
1109 bytes_remaining -= blob_len;
1111 /* BB check if Unicode and decode strings */
1112 if (bytes_remaining == 0) {
1113 /* no string area to decode, do nothing */
1114 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1115 /* unicode string area must be word-aligned */
1116 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1120 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1123 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1127 rc = sess_establish_session(sess_data);
1129 key_invalidate(spnego_key);
1130 key_put(spnego_key);
1132 sess_data->result = rc;
1133 sess_data->func = NULL;
1134 sess_free_buffer(sess_data);
1135 kfree(ses->auth_key.response);
1136 ses->auth_key.response = NULL;
1139 #endif /* ! CONFIG_CIFS_UPCALL */
1142 * The required kvec buffers have to be allocated before calling this
1146 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1148 struct smb_hdr *smb_buf;
1149 SESSION_SETUP_ANDX *pSMB;
1150 struct cifs_ses *ses = sess_data->ses;
1154 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1155 smb_buf = (struct smb_hdr *)pSMB;
1157 capabilities = cifs_ssetup_hdr(ses, pSMB);
1158 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1159 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1163 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1164 capabilities |= CAP_EXTENDED_SECURITY;
1165 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1167 bcc_ptr = sess_data->iov[2].iov_base;
1168 /* unicode strings must be word aligned */
1169 if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1173 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1175 sess_data->iov[2].iov_len = (long) bcc_ptr -
1176 (long) sess_data->iov[2].iov_base;
1182 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1185 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1188 struct smb_hdr *smb_buf;
1189 SESSION_SETUP_ANDX *pSMB;
1190 struct cifs_ses *ses = sess_data->ses;
1191 __u16 bytes_remaining;
1195 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1198 * if memory allocation is successful, caller of this function
1201 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1202 if (!ses->ntlmssp) {
1206 ses->ntlmssp->sesskey_per_smbsess = false;
1209 rc = sess_alloc_buffer(sess_data, 12);
1213 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1215 /* Build security blob before we assemble the request */
1216 build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
1217 sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
1218 sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
1219 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
1221 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1225 rc = sess_sendreceive(sess_data);
1227 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1228 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1230 /* If true, rc here is expected and not an error */
1231 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1232 smb_buf->Status.CifsError ==
1233 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1239 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1241 if (smb_buf->WordCount != 4) {
1243 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1247 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1248 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1250 bytes_remaining = get_bcc(smb_buf);
1251 bcc_ptr = pByteArea(smb_buf);
1253 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1254 if (blob_len > bytes_remaining) {
1255 cifs_dbg(VFS, "bad security blob length %d\n",
1261 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1263 sess_free_buffer(sess_data);
1266 sess_data->func = sess_auth_rawntlmssp_authenticate;
1270 /* Else error. Cleanup */
1271 kfree(ses->auth_key.response);
1272 ses->auth_key.response = NULL;
1273 kfree(ses->ntlmssp);
1274 ses->ntlmssp = NULL;
1276 sess_data->func = NULL;
1277 sess_data->result = rc;
1281 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1284 struct smb_hdr *smb_buf;
1285 SESSION_SETUP_ANDX *pSMB;
1286 struct cifs_ses *ses = sess_data->ses;
1287 __u16 bytes_remaining;
1289 unsigned char *ntlmsspblob = NULL;
1292 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1295 rc = sess_alloc_buffer(sess_data, 12);
1299 /* Build security blob before we assemble the request */
1300 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1301 smb_buf = (struct smb_hdr *)pSMB;
1302 rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1303 &blob_len, ses, sess_data->nls_cp);
1305 goto out_free_ntlmsspblob;
1306 sess_data->iov[1].iov_len = blob_len;
1307 sess_data->iov[1].iov_base = ntlmsspblob;
1308 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1310 * Make sure that we tell the server that we are using
1311 * the uid that it just gave us back on the response
1314 smb_buf->Uid = ses->Suid;
1316 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1318 goto out_free_ntlmsspblob;
1320 rc = sess_sendreceive(sess_data);
1322 goto out_free_ntlmsspblob;
1324 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1325 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1326 if (smb_buf->WordCount != 4) {
1328 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1329 goto out_free_ntlmsspblob;
1332 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1333 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1335 if (ses->Suid != smb_buf->Uid) {
1336 ses->Suid = smb_buf->Uid;
1337 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1340 bytes_remaining = get_bcc(smb_buf);
1341 bcc_ptr = pByteArea(smb_buf);
1342 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1343 if (blob_len > bytes_remaining) {
1344 cifs_dbg(VFS, "bad security blob length %d\n",
1347 goto out_free_ntlmsspblob;
1349 bcc_ptr += blob_len;
1350 bytes_remaining -= blob_len;
1353 /* BB check if Unicode and decode strings */
1354 if (bytes_remaining == 0) {
1355 /* no string area to decode, do nothing */
1356 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1357 /* unicode string area must be word-aligned */
1358 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1362 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1365 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1369 out_free_ntlmsspblob:
1372 sess_free_buffer(sess_data);
1375 rc = sess_establish_session(sess_data);
1378 kfree(ses->auth_key.response);
1379 ses->auth_key.response = NULL;
1380 kfree(ses->ntlmssp);
1381 ses->ntlmssp = NULL;
1383 sess_data->func = NULL;
1384 sess_data->result = rc;
1387 static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
1391 type = select_sectype(ses->server, ses->sectype);
1392 cifs_dbg(FYI, "sess setup type %d\n", type);
1393 if (type == Unspecified) {
1395 "Unable to select appropriate authentication method!");
1401 /* LANMAN and plaintext are less secure and off by default.
1402 * So we make this explicitly be turned on in kconfig (in the
1403 * build) and turned on at runtime (changed from the default)
1404 * in proc/fs/cifs or via mount parm. Unfortunately this is
1405 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
1406 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1407 sess_data->func = sess_auth_lanman;
1413 sess_data->func = sess_auth_ntlm;
1416 sess_data->func = sess_auth_ntlmv2;
1419 #ifdef CONFIG_CIFS_UPCALL
1420 sess_data->func = sess_auth_kerberos;
1423 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1426 #endif /* CONFIG_CIFS_UPCALL */
1428 sess_data->func = sess_auth_rawntlmssp_negotiate;
1431 cifs_dbg(VFS, "secType %d not supported!\n", type);
1438 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1439 const struct nls_table *nls_cp)
1442 struct sess_data *sess_data;
1445 WARN(1, "%s: ses == NULL!", __func__);
1449 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1453 rc = select_sec(ses, sess_data);
1457 sess_data->xid = xid;
1458 sess_data->ses = ses;
1459 sess_data->buf0_type = CIFS_NO_BUFFER;
1460 sess_data->nls_cp = (struct nls_table *) nls_cp;
1462 while (sess_data->func)
1463 sess_data->func(sess_data);
1465 /* Store result before we free sess_data */
1466 rc = sess_data->result;