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 = __constant_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");
254 len = strnlen(bcc_ptr, bleft);
258 kfree(ses->serverNOS);
260 ses->serverNOS = kzalloc(len + 1, GFP_KERNEL);
262 strncpy(ses->serverNOS, bcc_ptr, len);
267 len = strnlen(bcc_ptr, bleft);
271 /* No domain field in LANMAN case. Domain is
272 returned by old servers in the SMB negprot response */
273 /* BB For newer servers which do not support Unicode,
274 but thus do return domain here we could add parsing
275 for it later, but it is not very important */
276 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
279 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
280 struct cifs_ses *ses)
282 unsigned int tioffset; /* challenge message target info area */
283 unsigned int tilen; /* challenge message target info area length */
285 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
287 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
288 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
292 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
293 cifs_dbg(VFS, "blob signature incorrect %s\n",
297 if (pblob->MessageType != NtLmChallenge) {
298 cifs_dbg(VFS, "Incorrect message type %d\n",
303 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
304 /* BB we could decode pblob->NegotiateFlags; some may be useful */
305 /* In particular we can examine sign flags */
306 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
307 we must set the MIC field of the AUTHENTICATE_MESSAGE */
308 ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags);
309 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
310 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
311 if (tioffset > blob_len || tioffset + tilen > blob_len) {
312 cifs_dbg(VFS, "tioffset + tilen too high %u + %u",
317 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
319 if (!ses->auth_key.response) {
320 cifs_dbg(VFS, "Challenge target info alloc failure");
323 ses->auth_key.len = tilen;
329 /* BB Move to ntlmssp.c eventually */
331 /* We do not malloc the blob, it is passed in pbuffer, because
332 it is fixed size, and small, making this approach cleaner */
333 void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
334 struct cifs_ses *ses)
336 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer;
339 memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
340 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
341 sec_blob->MessageType = NtLmNegotiate;
343 /* BB is NTLMV2 session security format easier to use here? */
344 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
345 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
346 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
347 if (ses->server->sign) {
348 flags |= NTLMSSP_NEGOTIATE_SIGN;
349 if (!ses->server->session_estab ||
350 ses->ntlmssp->sesskey_per_smbsess)
351 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
354 sec_blob->NegotiateFlags = cpu_to_le32(flags);
356 sec_blob->WorkstationName.BufferOffset = 0;
357 sec_blob->WorkstationName.Length = 0;
358 sec_blob->WorkstationName.MaximumLength = 0;
360 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
361 sec_blob->DomainName.BufferOffset = 0;
362 sec_blob->DomainName.Length = 0;
363 sec_blob->DomainName.MaximumLength = 0;
366 /* We do not malloc the blob, it is passed in pbuffer, because its
367 maximum possible size is fixed and small, making this approach cleaner.
368 This function returns the length of the data in the blob */
369 int build_ntlmssp_auth_blob(unsigned char *pbuffer,
371 struct cifs_ses *ses,
372 const struct nls_table *nls_cp)
375 AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer;
379 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
380 sec_blob->MessageType = NtLmAuthenticate;
382 flags = NTLMSSP_NEGOTIATE_56 |
383 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
384 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
385 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
386 if (ses->server->sign) {
387 flags |= NTLMSSP_NEGOTIATE_SIGN;
388 if (!ses->server->session_estab ||
389 ses->ntlmssp->sesskey_per_smbsess)
390 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
393 tmp = pbuffer + sizeof(AUTHENTICATE_MESSAGE);
394 sec_blob->NegotiateFlags = cpu_to_le32(flags);
396 sec_blob->LmChallengeResponse.BufferOffset =
397 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
398 sec_blob->LmChallengeResponse.Length = 0;
399 sec_blob->LmChallengeResponse.MaximumLength = 0;
401 sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer);
402 rc = setup_ntlmv2_rsp(ses, nls_cp);
404 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
405 goto setup_ntlmv2_ret;
407 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
408 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
409 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
411 sec_blob->NtChallengeResponse.Length =
412 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
413 sec_blob->NtChallengeResponse.MaximumLength =
414 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
416 if (ses->domainName == NULL) {
417 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
418 sec_blob->DomainName.Length = 0;
419 sec_blob->DomainName.MaximumLength = 0;
423 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
424 CIFS_MAX_USERNAME_LEN, nls_cp);
425 len *= 2; /* unicode is 2 bytes each */
426 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
427 sec_blob->DomainName.Length = cpu_to_le16(len);
428 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
432 if (ses->user_name == NULL) {
433 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
434 sec_blob->UserName.Length = 0;
435 sec_blob->UserName.MaximumLength = 0;
439 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
440 CIFS_MAX_USERNAME_LEN, nls_cp);
441 len *= 2; /* unicode is 2 bytes each */
442 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
443 sec_blob->UserName.Length = cpu_to_le16(len);
444 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
448 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - pbuffer);
449 sec_blob->WorkstationName.Length = 0;
450 sec_blob->WorkstationName.MaximumLength = 0;
453 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
454 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
455 && !calc_seckey(ses)) {
456 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
457 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
458 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
459 sec_blob->SessionKey.MaximumLength =
460 cpu_to_le16(CIFS_CPHTXT_SIZE);
461 tmp += CIFS_CPHTXT_SIZE;
463 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
464 sec_blob->SessionKey.Length = 0;
465 sec_blob->SessionKey.MaximumLength = 0;
469 *buflen = tmp - pbuffer;
474 select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
476 switch (server->negflavor) {
477 case CIFS_NEGFLAVOR_EXTENDED:
483 if (server->sec_ntlmssp &&
484 (global_secflags & CIFSSEC_MAY_NTLMSSP))
486 if ((server->sec_kerberos || server->sec_mskerberos) &&
487 (global_secflags & CIFSSEC_MAY_KRB5))
493 case CIFS_NEGFLAVOR_UNENCAP:
499 if (global_secflags & CIFSSEC_MAY_NTLMV2)
501 if (global_secflags & CIFSSEC_MAY_NTLM)
504 /* Fallthrough to attempt LANMAN authentication next */
507 case CIFS_NEGFLAVOR_LANMAN:
512 if (global_secflags & CIFSSEC_MAY_LANMAN)
525 struct cifs_ses *ses;
526 struct nls_table *nls_cp;
527 void (*func)(struct sess_data *);
530 /* we will send the SMB in three pieces:
531 * a fixed length beginning part, an optional
532 * SPNEGO blob (which can be zero length), and a
533 * last part which will include the strings
534 * and rest of bcc area. This allows us to avoid
535 * a large buffer 17K allocation
542 sess_alloc_buffer(struct sess_data *sess_data, int wct)
545 struct cifs_ses *ses = sess_data->ses;
546 struct smb_hdr *smb_buf;
548 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
554 sess_data->iov[0].iov_base = (char *)smb_buf;
555 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
557 * This variable will be used to clear the buffer
558 * allocated above in case of any error in the calling function.
560 sess_data->buf0_type = CIFS_SMALL_BUFFER;
562 /* 2000 big enough to fit max user, domain, NOS name etc. */
563 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
564 if (!sess_data->iov[2].iov_base) {
566 goto out_free_smb_buf;
573 sess_data->iov[0].iov_base = NULL;
574 sess_data->iov[0].iov_len = 0;
575 sess_data->buf0_type = CIFS_NO_BUFFER;
580 sess_free_buffer(struct sess_data *sess_data)
583 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
584 sess_data->buf0_type = CIFS_NO_BUFFER;
585 kfree(sess_data->iov[2].iov_base);
589 sess_establish_session(struct sess_data *sess_data)
591 struct cifs_ses *ses = sess_data->ses;
593 mutex_lock(&ses->server->srv_mutex);
594 if (!ses->server->session_estab) {
595 if (ses->server->sign) {
596 ses->server->session_key.response =
597 kmemdup(ses->auth_key.response,
598 ses->auth_key.len, GFP_KERNEL);
599 if (!ses->server->session_key.response) {
600 mutex_unlock(&ses->server->srv_mutex);
603 ses->server->session_key.len =
606 ses->server->sequence_number = 0x2;
607 ses->server->session_estab = true;
609 mutex_unlock(&ses->server->srv_mutex);
611 cifs_dbg(FYI, "CIFS session established successfully\n");
612 spin_lock(&GlobalMid_Lock);
613 ses->status = CifsGood;
614 ses->need_reconnect = false;
615 spin_unlock(&GlobalMid_Lock);
621 sess_sendreceive(struct sess_data *sess_data)
624 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
627 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
628 smb_buf->smb_buf_length =
629 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
630 put_bcc(count, smb_buf);
632 rc = SendReceive2(sess_data->xid, sess_data->ses,
633 sess_data->iov, 3 /* num_iovecs */,
634 &sess_data->buf0_type,
641 * LANMAN and plaintext are less secure and off by default.
642 * So we make this explicitly be turned on in kconfig (in the
643 * build) and turned on at runtime (changed from the default)
644 * in proc/fs/cifs or via mount parm. Unfortunately this is
645 * needed for old Win (e.g. Win95), some obscure NAS and OS/2
647 #ifdef CONFIG_CIFS_WEAK_PW_HASH
649 sess_auth_lanman(struct sess_data *sess_data)
652 struct smb_hdr *smb_buf;
653 SESSION_SETUP_ANDX *pSMB;
655 struct cifs_ses *ses = sess_data->ses;
656 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
658 __u16 bytes_remaining;
660 /* lanman 2 style sessionsetup */
662 rc = sess_alloc_buffer(sess_data, 10);
666 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
667 bcc_ptr = sess_data->iov[2].iov_base;
668 capabilities = cifs_ssetup_hdr(ses, pSMB);
670 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
672 /* no capabilities flags in old lanman negotiation */
673 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
675 /* Calculate hash with password and copy into bcc_ptr.
676 * Encryption Key (stored as in cryptkey) gets used if the
677 * security mode bit in Negottiate Protocol response states
678 * to use challenge/response method (i.e. Password bit is 1).
680 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
681 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
682 true : false, lnm_session_key);
684 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
685 bcc_ptr += CIFS_AUTH_RESP_SIZE;
688 * can not sign if LANMAN negotiated so no need
689 * to calculate signing key? but what if server
690 * changed to do higher than lanman dialect and
691 * we reconnected would we ever calc signing_key?
694 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
695 /* Unicode not allowed for LANMAN dialects */
696 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
698 sess_data->iov[2].iov_len = (long) bcc_ptr -
699 (long) sess_data->iov[2].iov_base;
701 rc = sess_sendreceive(sess_data);
705 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
706 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
708 /* lanman response has a word count of 3 */
709 if (smb_buf->WordCount != 3) {
711 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
715 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
716 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
718 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
719 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
721 bytes_remaining = get_bcc(smb_buf);
722 bcc_ptr = pByteArea(smb_buf);
724 /* BB check if Unicode and decode strings */
725 if (bytes_remaining == 0) {
726 /* no string area to decode, do nothing */
727 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
728 /* unicode string area must be word-aligned */
729 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
733 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
736 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
740 rc = sess_establish_session(sess_data);
742 sess_data->result = rc;
743 sess_data->func = NULL;
744 sess_free_buffer(sess_data);
750 sess_auth_lanman(struct sess_data *sess_data)
752 sess_data->result = -EOPNOTSUPP;
753 sess_data->func = NULL;
758 sess_auth_ntlm(struct sess_data *sess_data)
761 struct smb_hdr *smb_buf;
762 SESSION_SETUP_ANDX *pSMB;
764 struct cifs_ses *ses = sess_data->ses;
766 __u16 bytes_remaining;
768 /* old style NTLM sessionsetup */
770 rc = sess_alloc_buffer(sess_data, 13);
774 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
775 bcc_ptr = sess_data->iov[2].iov_base;
776 capabilities = cifs_ssetup_hdr(ses, pSMB);
778 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
779 pSMB->req_no_secext.CaseInsensitivePasswordLength =
780 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
781 pSMB->req_no_secext.CaseSensitivePasswordLength =
782 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
784 /* calculate ntlm response and session key */
785 rc = setup_ntlm_response(ses, sess_data->nls_cp);
787 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
792 /* copy ntlm response */
793 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
794 CIFS_AUTH_RESP_SIZE);
795 bcc_ptr += CIFS_AUTH_RESP_SIZE;
796 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
797 CIFS_AUTH_RESP_SIZE);
798 bcc_ptr += CIFS_AUTH_RESP_SIZE;
800 if (ses->capabilities & CAP_UNICODE) {
801 /* unicode strings must be word aligned */
802 if (sess_data->iov[0].iov_len % 2) {
806 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
808 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
812 sess_data->iov[2].iov_len = (long) bcc_ptr -
813 (long) sess_data->iov[2].iov_base;
815 rc = sess_sendreceive(sess_data);
819 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
820 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
822 if (smb_buf->WordCount != 3) {
824 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
828 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
829 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
831 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
832 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
834 bytes_remaining = get_bcc(smb_buf);
835 bcc_ptr = pByteArea(smb_buf);
837 /* BB check if Unicode and decode strings */
838 if (bytes_remaining == 0) {
839 /* no string area to decode, do nothing */
840 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
841 /* unicode string area must be word-aligned */
842 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
846 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
849 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
853 rc = sess_establish_session(sess_data);
855 sess_data->result = rc;
856 sess_data->func = NULL;
857 sess_free_buffer(sess_data);
858 kfree(ses->auth_key.response);
859 ses->auth_key.response = NULL;
863 sess_auth_ntlmv2(struct sess_data *sess_data)
866 struct smb_hdr *smb_buf;
867 SESSION_SETUP_ANDX *pSMB;
869 struct cifs_ses *ses = sess_data->ses;
871 __u16 bytes_remaining;
873 /* old style NTLM sessionsetup */
875 rc = sess_alloc_buffer(sess_data, 13);
879 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
880 bcc_ptr = sess_data->iov[2].iov_base;
881 capabilities = cifs_ssetup_hdr(ses, pSMB);
883 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
885 /* LM2 password would be here if we supported it */
886 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
888 /* calculate nlmv2 response and session key */
889 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
891 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
895 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
896 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
897 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
899 /* set case sensitive password length after tilen may get
900 * assigned, tilen is 0 otherwise.
902 pSMB->req_no_secext.CaseSensitivePasswordLength =
903 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
905 if (ses->capabilities & CAP_UNICODE) {
906 if (sess_data->iov[0].iov_len % 2) {
910 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
912 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
916 sess_data->iov[2].iov_len = (long) bcc_ptr -
917 (long) sess_data->iov[2].iov_base;
919 rc = sess_sendreceive(sess_data);
923 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
924 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
926 if (smb_buf->WordCount != 3) {
928 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
932 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
933 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
935 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
936 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
938 bytes_remaining = get_bcc(smb_buf);
939 bcc_ptr = pByteArea(smb_buf);
941 /* BB check if Unicode and decode strings */
942 if (bytes_remaining == 0) {
943 /* no string area to decode, do nothing */
944 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
945 /* unicode string area must be word-aligned */
946 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
950 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
953 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
957 rc = sess_establish_session(sess_data);
959 sess_data->result = rc;
960 sess_data->func = NULL;
961 sess_free_buffer(sess_data);
962 kfree(ses->auth_key.response);
963 ses->auth_key.response = NULL;
966 #ifdef CONFIG_CIFS_UPCALL
968 sess_auth_kerberos(struct sess_data *sess_data)
971 struct smb_hdr *smb_buf;
972 SESSION_SETUP_ANDX *pSMB;
974 struct cifs_ses *ses = sess_data->ses;
976 __u16 bytes_remaining;
977 struct key *spnego_key = NULL;
978 struct cifs_spnego_msg *msg;
981 /* extended security */
983 rc = sess_alloc_buffer(sess_data, 12);
987 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
988 bcc_ptr = sess_data->iov[2].iov_base;
989 capabilities = cifs_ssetup_hdr(ses, pSMB);
991 spnego_key = cifs_get_spnego_key(ses);
992 if (IS_ERR(spnego_key)) {
993 rc = PTR_ERR(spnego_key);
998 msg = spnego_key->payload.data;
1000 * check version field to make sure that cifs.upcall is
1001 * sending us a response in an expected form
1003 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1005 "incorrect version of cifs.upcall (expected %d but got %d)",
1006 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1008 goto out_put_spnego_key;
1011 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1013 if (!ses->auth_key.response) {
1014 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory",
1017 goto out_put_spnego_key;
1019 ses->auth_key.len = msg->sesskey_len;
1021 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1022 capabilities |= CAP_EXTENDED_SECURITY;
1023 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1024 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1025 sess_data->iov[1].iov_len = msg->secblob_len;
1026 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1028 if (ses->capabilities & CAP_UNICODE) {
1029 /* unicode strings must be word aligned */
1030 if ((sess_data->iov[0].iov_len
1031 + sess_data->iov[1].iov_len) % 2) {
1035 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1036 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1038 /* BB: is this right? */
1039 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1042 sess_data->iov[2].iov_len = (long) bcc_ptr -
1043 (long) sess_data->iov[2].iov_base;
1045 rc = sess_sendreceive(sess_data);
1047 goto out_put_spnego_key;
1049 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1050 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1052 if (smb_buf->WordCount != 4) {
1054 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1055 goto out_put_spnego_key;
1058 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1059 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1061 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1062 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1064 bytes_remaining = get_bcc(smb_buf);
1065 bcc_ptr = pByteArea(smb_buf);
1067 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1068 if (blob_len > bytes_remaining) {
1069 cifs_dbg(VFS, "bad security blob length %d\n",
1072 goto out_put_spnego_key;
1074 bcc_ptr += blob_len;
1075 bytes_remaining -= blob_len;
1077 /* BB check if Unicode and decode strings */
1078 if (bytes_remaining == 0) {
1079 /* no string area to decode, do nothing */
1080 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1081 /* unicode string area must be word-aligned */
1082 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1086 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1089 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1093 rc = sess_establish_session(sess_data);
1095 key_invalidate(spnego_key);
1096 key_put(spnego_key);
1098 sess_data->result = rc;
1099 sess_data->func = NULL;
1100 sess_free_buffer(sess_data);
1101 kfree(ses->auth_key.response);
1102 ses->auth_key.response = NULL;
1108 sess_auth_kerberos(struct sess_data *sess_data)
1110 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1111 sess_data->result = -ENOSYS;
1112 sess_data->func = NULL;
1114 #endif /* ! CONFIG_CIFS_UPCALL */
1117 * The required kvec buffers have to be allocated before calling this
1121 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1123 struct smb_hdr *smb_buf;
1124 SESSION_SETUP_ANDX *pSMB;
1125 struct cifs_ses *ses = sess_data->ses;
1129 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1130 smb_buf = (struct smb_hdr *)pSMB;
1132 capabilities = cifs_ssetup_hdr(ses, pSMB);
1133 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1134 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1138 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1139 capabilities |= CAP_EXTENDED_SECURITY;
1140 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1142 bcc_ptr = sess_data->iov[2].iov_base;
1143 /* unicode strings must be word aligned */
1144 if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1148 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1150 sess_data->iov[2].iov_len = (long) bcc_ptr -
1151 (long) sess_data->iov[2].iov_base;
1157 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1160 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1163 struct smb_hdr *smb_buf;
1164 SESSION_SETUP_ANDX *pSMB;
1165 struct cifs_ses *ses = sess_data->ses;
1166 __u16 bytes_remaining;
1170 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1173 * if memory allocation is successful, caller of this function
1176 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1177 if (!ses->ntlmssp) {
1181 ses->ntlmssp->sesskey_per_smbsess = false;
1184 rc = sess_alloc_buffer(sess_data, 12);
1188 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1190 /* Build security blob before we assemble the request */
1191 build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
1192 sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
1193 sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
1194 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
1196 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1200 rc = sess_sendreceive(sess_data);
1202 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1203 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1205 /* If true, rc here is expected and not an error */
1206 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1207 smb_buf->Status.CifsError ==
1208 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1214 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1216 if (smb_buf->WordCount != 4) {
1218 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1222 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1223 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1225 bytes_remaining = get_bcc(smb_buf);
1226 bcc_ptr = pByteArea(smb_buf);
1228 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1229 if (blob_len > bytes_remaining) {
1230 cifs_dbg(VFS, "bad security blob length %d\n",
1236 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1238 sess_free_buffer(sess_data);
1241 sess_data->func = sess_auth_rawntlmssp_authenticate;
1245 /* Else error. Cleanup */
1246 kfree(ses->auth_key.response);
1247 ses->auth_key.response = NULL;
1248 kfree(ses->ntlmssp);
1249 ses->ntlmssp = NULL;
1251 sess_data->func = NULL;
1252 sess_data->result = rc;
1256 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1259 struct smb_hdr *smb_buf;
1260 SESSION_SETUP_ANDX *pSMB;
1261 struct cifs_ses *ses = sess_data->ses;
1262 __u16 bytes_remaining;
1264 char *ntlmsspblob = NULL;
1267 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1270 rc = sess_alloc_buffer(sess_data, 12);
1274 /* Build security blob before we assemble the request */
1275 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1276 smb_buf = (struct smb_hdr *)pSMB;
1278 * 5 is an empirical value, large enough to hold
1279 * authenticate message plus max 10 of av paris,
1280 * domain, user, workstation names, flags, etc.
1282 ntlmsspblob = kzalloc(5*sizeof(struct _AUTHENTICATE_MESSAGE),
1289 rc = build_ntlmssp_auth_blob(ntlmsspblob,
1290 &blob_len, ses, sess_data->nls_cp);
1292 goto out_free_ntlmsspblob;
1293 sess_data->iov[1].iov_len = blob_len;
1294 sess_data->iov[1].iov_base = ntlmsspblob;
1295 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1297 * Make sure that we tell the server that we are using
1298 * the uid that it just gave us back on the response
1301 smb_buf->Uid = ses->Suid;
1303 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1305 goto out_free_ntlmsspblob;
1307 rc = sess_sendreceive(sess_data);
1309 goto out_free_ntlmsspblob;
1311 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1312 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1313 if (smb_buf->WordCount != 4) {
1315 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1316 goto out_free_ntlmsspblob;
1319 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1320 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1322 bytes_remaining = get_bcc(smb_buf);
1323 bcc_ptr = pByteArea(smb_buf);
1324 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1325 if (blob_len > bytes_remaining) {
1326 cifs_dbg(VFS, "bad security blob length %d\n",
1329 goto out_free_ntlmsspblob;
1331 bcc_ptr += blob_len;
1332 bytes_remaining -= blob_len;
1335 /* BB check if Unicode and decode strings */
1336 if (bytes_remaining == 0) {
1337 /* no string area to decode, do nothing */
1338 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1339 /* unicode string area must be word-aligned */
1340 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1344 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1347 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1351 out_free_ntlmsspblob:
1354 sess_free_buffer(sess_data);
1357 rc = sess_establish_session(sess_data);
1360 kfree(ses->auth_key.response);
1361 ses->auth_key.response = NULL;
1362 kfree(ses->ntlmssp);
1363 ses->ntlmssp = NULL;
1365 sess_data->func = NULL;
1366 sess_data->result = rc;
1369 static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
1373 type = select_sectype(ses->server, ses->sectype);
1374 cifs_dbg(FYI, "sess setup type %d\n", type);
1375 if (type == Unspecified) {
1377 "Unable to select appropriate authentication method!");
1383 /* LANMAN and plaintext are less secure and off by default.
1384 * So we make this explicitly be turned on in kconfig (in the
1385 * build) and turned on at runtime (changed from the default)
1386 * in proc/fs/cifs or via mount parm. Unfortunately this is
1387 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
1388 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1389 sess_data->func = sess_auth_lanman;
1395 sess_data->func = sess_auth_ntlm;
1398 sess_data->func = sess_auth_ntlmv2;
1401 #ifdef CONFIG_CIFS_UPCALL
1402 sess_data->func = sess_auth_kerberos;
1405 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1408 #endif /* CONFIG_CIFS_UPCALL */
1410 sess_data->func = sess_auth_rawntlmssp_negotiate;
1413 cifs_dbg(VFS, "secType %d not supported!\n", type);
1420 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1421 const struct nls_table *nls_cp)
1424 struct sess_data *sess_data;
1427 WARN(1, "%s: ses == NULL!", __func__);
1431 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1435 rc = select_sec(ses, sess_data);
1439 sess_data->xid = xid;
1440 sess_data->ses = ses;
1441 sess_data->buf0_type = CIFS_NO_BUFFER;
1442 sess_data->nls_cp = (struct nls_table *) nls_cp;
1444 while (sess_data->func)
1445 sess_data->func(sess_data);
1447 /* Store result before we free sess_data */
1448 rc = sess_data->result;