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 /* We do not malloc the blob, it is passed in pbuffer, because its
368 maximum possible size is fixed and small, making this approach cleaner.
369 This function returns the length of the data in the blob */
370 int build_ntlmssp_auth_blob(unsigned char *pbuffer,
372 struct cifs_ses *ses,
373 const struct nls_table *nls_cp)
376 AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer;
380 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
381 sec_blob->MessageType = NtLmAuthenticate;
383 flags = NTLMSSP_NEGOTIATE_56 |
384 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
385 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
386 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
387 if (ses->server->sign) {
388 flags |= NTLMSSP_NEGOTIATE_SIGN;
389 if (!ses->server->session_estab ||
390 ses->ntlmssp->sesskey_per_smbsess)
391 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
394 tmp = pbuffer + sizeof(AUTHENTICATE_MESSAGE);
395 sec_blob->NegotiateFlags = cpu_to_le32(flags);
397 sec_blob->LmChallengeResponse.BufferOffset =
398 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
399 sec_blob->LmChallengeResponse.Length = 0;
400 sec_blob->LmChallengeResponse.MaximumLength = 0;
402 sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer);
403 if (ses->user_name != NULL) {
404 rc = setup_ntlmv2_rsp(ses, nls_cp);
406 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
407 goto setup_ntlmv2_ret;
409 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
410 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
411 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
413 sec_blob->NtChallengeResponse.Length =
414 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
415 sec_blob->NtChallengeResponse.MaximumLength =
416 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
419 * don't send an NT Response for anonymous access
421 sec_blob->NtChallengeResponse.Length = 0;
422 sec_blob->NtChallengeResponse.MaximumLength = 0;
425 if (ses->domainName == NULL) {
426 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
427 sec_blob->DomainName.Length = 0;
428 sec_blob->DomainName.MaximumLength = 0;
432 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
433 CIFS_MAX_USERNAME_LEN, nls_cp);
434 len *= 2; /* unicode is 2 bytes each */
435 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
436 sec_blob->DomainName.Length = cpu_to_le16(len);
437 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
441 if (ses->user_name == NULL) {
442 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
443 sec_blob->UserName.Length = 0;
444 sec_blob->UserName.MaximumLength = 0;
448 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
449 CIFS_MAX_USERNAME_LEN, nls_cp);
450 len *= 2; /* unicode is 2 bytes each */
451 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
452 sec_blob->UserName.Length = cpu_to_le16(len);
453 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
457 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - pbuffer);
458 sec_blob->WorkstationName.Length = 0;
459 sec_blob->WorkstationName.MaximumLength = 0;
462 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
463 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
464 && !calc_seckey(ses)) {
465 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
466 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
467 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
468 sec_blob->SessionKey.MaximumLength =
469 cpu_to_le16(CIFS_CPHTXT_SIZE);
470 tmp += CIFS_CPHTXT_SIZE;
472 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
473 sec_blob->SessionKey.Length = 0;
474 sec_blob->SessionKey.MaximumLength = 0;
478 *buflen = tmp - pbuffer;
483 select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
485 switch (server->negflavor) {
486 case CIFS_NEGFLAVOR_EXTENDED:
492 if (server->sec_ntlmssp &&
493 (global_secflags & CIFSSEC_MAY_NTLMSSP))
495 if ((server->sec_kerberos || server->sec_mskerberos) &&
496 (global_secflags & CIFSSEC_MAY_KRB5))
502 case CIFS_NEGFLAVOR_UNENCAP:
508 if (global_secflags & CIFSSEC_MAY_NTLMV2)
510 if (global_secflags & CIFSSEC_MAY_NTLM)
513 /* Fallthrough to attempt LANMAN authentication next */
516 case CIFS_NEGFLAVOR_LANMAN:
521 if (global_secflags & CIFSSEC_MAY_LANMAN)
534 struct cifs_ses *ses;
535 struct nls_table *nls_cp;
536 void (*func)(struct sess_data *);
539 /* we will send the SMB in three pieces:
540 * a fixed length beginning part, an optional
541 * SPNEGO blob (which can be zero length), and a
542 * last part which will include the strings
543 * and rest of bcc area. This allows us to avoid
544 * a large buffer 17K allocation
551 sess_alloc_buffer(struct sess_data *sess_data, int wct)
554 struct cifs_ses *ses = sess_data->ses;
555 struct smb_hdr *smb_buf;
557 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
563 sess_data->iov[0].iov_base = (char *)smb_buf;
564 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
566 * This variable will be used to clear the buffer
567 * allocated above in case of any error in the calling function.
569 sess_data->buf0_type = CIFS_SMALL_BUFFER;
571 /* 2000 big enough to fit max user, domain, NOS name etc. */
572 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
573 if (!sess_data->iov[2].iov_base) {
575 goto out_free_smb_buf;
582 sess_data->iov[0].iov_base = NULL;
583 sess_data->iov[0].iov_len = 0;
584 sess_data->buf0_type = CIFS_NO_BUFFER;
589 sess_free_buffer(struct sess_data *sess_data)
592 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
593 sess_data->buf0_type = CIFS_NO_BUFFER;
594 kfree(sess_data->iov[2].iov_base);
598 sess_establish_session(struct sess_data *sess_data)
600 struct cifs_ses *ses = sess_data->ses;
602 mutex_lock(&ses->server->srv_mutex);
603 if (!ses->server->session_estab) {
604 if (ses->server->sign) {
605 ses->server->session_key.response =
606 kmemdup(ses->auth_key.response,
607 ses->auth_key.len, GFP_KERNEL);
608 if (!ses->server->session_key.response) {
609 mutex_unlock(&ses->server->srv_mutex);
612 ses->server->session_key.len =
615 ses->server->sequence_number = 0x2;
616 ses->server->session_estab = true;
618 mutex_unlock(&ses->server->srv_mutex);
620 cifs_dbg(FYI, "CIFS session established successfully\n");
621 spin_lock(&GlobalMid_Lock);
622 ses->status = CifsGood;
623 ses->need_reconnect = false;
624 spin_unlock(&GlobalMid_Lock);
630 sess_sendreceive(struct sess_data *sess_data)
633 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
636 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
637 smb_buf->smb_buf_length =
638 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
639 put_bcc(count, smb_buf);
641 rc = SendReceive2(sess_data->xid, sess_data->ses,
642 sess_data->iov, 3 /* num_iovecs */,
643 &sess_data->buf0_type,
650 * LANMAN and plaintext are less secure and off by default.
651 * So we make this explicitly be turned on in kconfig (in the
652 * build) and turned on at runtime (changed from the default)
653 * in proc/fs/cifs or via mount parm. Unfortunately this is
654 * needed for old Win (e.g. Win95), some obscure NAS and OS/2
656 #ifdef CONFIG_CIFS_WEAK_PW_HASH
658 sess_auth_lanman(struct sess_data *sess_data)
661 struct smb_hdr *smb_buf;
662 SESSION_SETUP_ANDX *pSMB;
664 struct cifs_ses *ses = sess_data->ses;
665 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
667 __u16 bytes_remaining;
669 /* lanman 2 style sessionsetup */
671 rc = sess_alloc_buffer(sess_data, 10);
675 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
676 bcc_ptr = sess_data->iov[2].iov_base;
677 capabilities = cifs_ssetup_hdr(ses, pSMB);
679 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
681 if (ses->user_name != NULL) {
682 /* no capabilities flags in old lanman negotiation */
683 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
685 /* Calculate hash with password and copy into bcc_ptr.
686 * Encryption Key (stored as in cryptkey) gets used if the
687 * security mode bit in Negottiate Protocol response states
688 * to use challenge/response method (i.e. Password bit is 1).
690 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
691 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
692 true : false, lnm_session_key);
694 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
695 bcc_ptr += CIFS_AUTH_RESP_SIZE;
697 pSMB->old_req.PasswordLength = 0;
701 * can not sign if LANMAN negotiated so no need
702 * to calculate signing key? but what if server
703 * changed to do higher than lanman dialect and
704 * we reconnected would we ever calc signing_key?
707 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
708 /* Unicode not allowed for LANMAN dialects */
709 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
711 sess_data->iov[2].iov_len = (long) bcc_ptr -
712 (long) sess_data->iov[2].iov_base;
714 rc = sess_sendreceive(sess_data);
718 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
719 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
721 /* lanman response has a word count of 3 */
722 if (smb_buf->WordCount != 3) {
724 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
728 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
729 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
731 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
732 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
734 bytes_remaining = get_bcc(smb_buf);
735 bcc_ptr = pByteArea(smb_buf);
737 /* BB check if Unicode and decode strings */
738 if (bytes_remaining == 0) {
739 /* no string area to decode, do nothing */
740 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
741 /* unicode string area must be word-aligned */
742 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
746 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
749 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
753 rc = sess_establish_session(sess_data);
755 sess_data->result = rc;
756 sess_data->func = NULL;
757 sess_free_buffer(sess_data);
763 sess_auth_ntlm(struct sess_data *sess_data)
766 struct smb_hdr *smb_buf;
767 SESSION_SETUP_ANDX *pSMB;
769 struct cifs_ses *ses = sess_data->ses;
771 __u16 bytes_remaining;
773 /* old style NTLM sessionsetup */
775 rc = sess_alloc_buffer(sess_data, 13);
779 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
780 bcc_ptr = sess_data->iov[2].iov_base;
781 capabilities = cifs_ssetup_hdr(ses, pSMB);
783 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
784 if (ses->user_name != NULL) {
785 pSMB->req_no_secext.CaseInsensitivePasswordLength =
786 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
787 pSMB->req_no_secext.CaseSensitivePasswordLength =
788 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
790 /* calculate ntlm response and session key */
791 rc = setup_ntlm_response(ses, sess_data->nls_cp);
793 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
798 /* copy ntlm response */
799 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
800 CIFS_AUTH_RESP_SIZE);
801 bcc_ptr += CIFS_AUTH_RESP_SIZE;
802 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
803 CIFS_AUTH_RESP_SIZE);
804 bcc_ptr += CIFS_AUTH_RESP_SIZE;
806 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
807 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
810 if (ses->capabilities & CAP_UNICODE) {
811 /* unicode strings must be word aligned */
812 if (sess_data->iov[0].iov_len % 2) {
816 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
818 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
822 sess_data->iov[2].iov_len = (long) bcc_ptr -
823 (long) sess_data->iov[2].iov_base;
825 rc = sess_sendreceive(sess_data);
829 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
830 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
832 if (smb_buf->WordCount != 3) {
834 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
838 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
839 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
841 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
842 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
844 bytes_remaining = get_bcc(smb_buf);
845 bcc_ptr = pByteArea(smb_buf);
847 /* BB check if Unicode and decode strings */
848 if (bytes_remaining == 0) {
849 /* no string area to decode, do nothing */
850 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
851 /* unicode string area must be word-aligned */
852 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
856 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
859 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
863 rc = sess_establish_session(sess_data);
865 sess_data->result = rc;
866 sess_data->func = NULL;
867 sess_free_buffer(sess_data);
868 kfree(ses->auth_key.response);
869 ses->auth_key.response = NULL;
873 sess_auth_ntlmv2(struct sess_data *sess_data)
876 struct smb_hdr *smb_buf;
877 SESSION_SETUP_ANDX *pSMB;
879 struct cifs_ses *ses = sess_data->ses;
881 __u16 bytes_remaining;
883 /* old style NTLM sessionsetup */
885 rc = sess_alloc_buffer(sess_data, 13);
889 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
890 bcc_ptr = sess_data->iov[2].iov_base;
891 capabilities = cifs_ssetup_hdr(ses, pSMB);
893 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
895 /* LM2 password would be here if we supported it */
896 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
898 /* calculate nlmv2 response and session key */
899 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
901 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
905 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
906 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
907 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
909 /* set case sensitive password length after tilen may get
910 * assigned, tilen is 0 otherwise.
912 pSMB->req_no_secext.CaseSensitivePasswordLength =
913 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
915 if (ses->capabilities & CAP_UNICODE) {
916 if (sess_data->iov[0].iov_len % 2) {
920 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
922 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
926 sess_data->iov[2].iov_len = (long) bcc_ptr -
927 (long) sess_data->iov[2].iov_base;
929 rc = sess_sendreceive(sess_data);
933 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
934 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
936 if (smb_buf->WordCount != 3) {
938 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
942 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
943 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
945 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
946 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
948 bytes_remaining = get_bcc(smb_buf);
949 bcc_ptr = pByteArea(smb_buf);
951 /* BB check if Unicode and decode strings */
952 if (bytes_remaining == 0) {
953 /* no string area to decode, do nothing */
954 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
955 /* unicode string area must be word-aligned */
956 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
960 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
963 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
967 rc = sess_establish_session(sess_data);
969 sess_data->result = rc;
970 sess_data->func = NULL;
971 sess_free_buffer(sess_data);
972 kfree(ses->auth_key.response);
973 ses->auth_key.response = NULL;
976 #ifdef CONFIG_CIFS_UPCALL
978 sess_auth_kerberos(struct sess_data *sess_data)
981 struct smb_hdr *smb_buf;
982 SESSION_SETUP_ANDX *pSMB;
984 struct cifs_ses *ses = sess_data->ses;
986 __u16 bytes_remaining;
987 struct key *spnego_key = NULL;
988 struct cifs_spnego_msg *msg;
991 /* extended security */
993 rc = sess_alloc_buffer(sess_data, 12);
997 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
998 bcc_ptr = sess_data->iov[2].iov_base;
999 capabilities = cifs_ssetup_hdr(ses, pSMB);
1001 spnego_key = cifs_get_spnego_key(ses);
1002 if (IS_ERR(spnego_key)) {
1003 rc = PTR_ERR(spnego_key);
1008 msg = spnego_key->payload.data[0];
1010 * check version field to make sure that cifs.upcall is
1011 * sending us a response in an expected form
1013 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1015 "incorrect version of cifs.upcall (expected %d but got %d)",
1016 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1018 goto out_put_spnego_key;
1021 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1023 if (!ses->auth_key.response) {
1024 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory",
1027 goto out_put_spnego_key;
1029 ses->auth_key.len = msg->sesskey_len;
1031 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1032 capabilities |= CAP_EXTENDED_SECURITY;
1033 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1034 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1035 sess_data->iov[1].iov_len = msg->secblob_len;
1036 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1038 if (ses->capabilities & CAP_UNICODE) {
1039 /* unicode strings must be word aligned */
1040 if ((sess_data->iov[0].iov_len
1041 + sess_data->iov[1].iov_len) % 2) {
1045 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1046 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1048 /* BB: is this right? */
1049 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1052 sess_data->iov[2].iov_len = (long) bcc_ptr -
1053 (long) sess_data->iov[2].iov_base;
1055 rc = sess_sendreceive(sess_data);
1057 goto out_put_spnego_key;
1059 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1060 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1062 if (smb_buf->WordCount != 4) {
1064 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1065 goto out_put_spnego_key;
1068 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1069 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1071 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1072 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1074 bytes_remaining = get_bcc(smb_buf);
1075 bcc_ptr = pByteArea(smb_buf);
1077 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1078 if (blob_len > bytes_remaining) {
1079 cifs_dbg(VFS, "bad security blob length %d\n",
1082 goto out_put_spnego_key;
1084 bcc_ptr += blob_len;
1085 bytes_remaining -= blob_len;
1087 /* BB check if Unicode and decode strings */
1088 if (bytes_remaining == 0) {
1089 /* no string area to decode, do nothing */
1090 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1091 /* unicode string area must be word-aligned */
1092 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1096 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1099 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1103 rc = sess_establish_session(sess_data);
1105 key_invalidate(spnego_key);
1106 key_put(spnego_key);
1108 sess_data->result = rc;
1109 sess_data->func = NULL;
1110 sess_free_buffer(sess_data);
1111 kfree(ses->auth_key.response);
1112 ses->auth_key.response = NULL;
1115 #endif /* ! CONFIG_CIFS_UPCALL */
1118 * The required kvec buffers have to be allocated before calling this
1122 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1124 struct smb_hdr *smb_buf;
1125 SESSION_SETUP_ANDX *pSMB;
1126 struct cifs_ses *ses = sess_data->ses;
1130 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1131 smb_buf = (struct smb_hdr *)pSMB;
1133 capabilities = cifs_ssetup_hdr(ses, pSMB);
1134 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1135 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1139 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1140 capabilities |= CAP_EXTENDED_SECURITY;
1141 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1143 bcc_ptr = sess_data->iov[2].iov_base;
1144 /* unicode strings must be word aligned */
1145 if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1149 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1151 sess_data->iov[2].iov_len = (long) bcc_ptr -
1152 (long) sess_data->iov[2].iov_base;
1158 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1161 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1164 struct smb_hdr *smb_buf;
1165 SESSION_SETUP_ANDX *pSMB;
1166 struct cifs_ses *ses = sess_data->ses;
1167 __u16 bytes_remaining;
1171 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1174 * if memory allocation is successful, caller of this function
1177 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1178 if (!ses->ntlmssp) {
1182 ses->ntlmssp->sesskey_per_smbsess = false;
1185 rc = sess_alloc_buffer(sess_data, 12);
1189 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1191 /* Build security blob before we assemble the request */
1192 build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
1193 sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
1194 sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
1195 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
1197 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1201 rc = sess_sendreceive(sess_data);
1203 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1204 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1206 /* If true, rc here is expected and not an error */
1207 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1208 smb_buf->Status.CifsError ==
1209 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1215 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1217 if (smb_buf->WordCount != 4) {
1219 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1223 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1224 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1226 bytes_remaining = get_bcc(smb_buf);
1227 bcc_ptr = pByteArea(smb_buf);
1229 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1230 if (blob_len > bytes_remaining) {
1231 cifs_dbg(VFS, "bad security blob length %d\n",
1237 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1239 sess_free_buffer(sess_data);
1242 sess_data->func = sess_auth_rawntlmssp_authenticate;
1246 /* Else error. Cleanup */
1247 kfree(ses->auth_key.response);
1248 ses->auth_key.response = NULL;
1249 kfree(ses->ntlmssp);
1250 ses->ntlmssp = NULL;
1252 sess_data->func = NULL;
1253 sess_data->result = rc;
1257 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1260 struct smb_hdr *smb_buf;
1261 SESSION_SETUP_ANDX *pSMB;
1262 struct cifs_ses *ses = sess_data->ses;
1263 __u16 bytes_remaining;
1265 char *ntlmsspblob = NULL;
1268 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1271 rc = sess_alloc_buffer(sess_data, 12);
1275 /* Build security blob before we assemble the request */
1276 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1277 smb_buf = (struct smb_hdr *)pSMB;
1279 * 5 is an empirical value, large enough to hold
1280 * authenticate message plus max 10 of av paris,
1281 * domain, user, workstation names, flags, etc.
1283 ntlmsspblob = kzalloc(5*sizeof(struct _AUTHENTICATE_MESSAGE),
1290 rc = build_ntlmssp_auth_blob(ntlmsspblob,
1291 &blob_len, ses, sess_data->nls_cp);
1293 goto out_free_ntlmsspblob;
1294 sess_data->iov[1].iov_len = blob_len;
1295 sess_data->iov[1].iov_base = ntlmsspblob;
1296 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1298 * Make sure that we tell the server that we are using
1299 * the uid that it just gave us back on the response
1302 smb_buf->Uid = ses->Suid;
1304 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1306 goto out_free_ntlmsspblob;
1308 rc = sess_sendreceive(sess_data);
1310 goto out_free_ntlmsspblob;
1312 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1313 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1314 if (smb_buf->WordCount != 4) {
1316 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1317 goto out_free_ntlmsspblob;
1320 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1321 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1323 if (ses->Suid != smb_buf->Uid) {
1324 ses->Suid = smb_buf->Uid;
1325 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1328 bytes_remaining = get_bcc(smb_buf);
1329 bcc_ptr = pByteArea(smb_buf);
1330 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1331 if (blob_len > bytes_remaining) {
1332 cifs_dbg(VFS, "bad security blob length %d\n",
1335 goto out_free_ntlmsspblob;
1337 bcc_ptr += blob_len;
1338 bytes_remaining -= blob_len;
1341 /* BB check if Unicode and decode strings */
1342 if (bytes_remaining == 0) {
1343 /* no string area to decode, do nothing */
1344 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1345 /* unicode string area must be word-aligned */
1346 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1350 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1353 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1357 out_free_ntlmsspblob:
1360 sess_free_buffer(sess_data);
1363 rc = sess_establish_session(sess_data);
1366 kfree(ses->auth_key.response);
1367 ses->auth_key.response = NULL;
1368 kfree(ses->ntlmssp);
1369 ses->ntlmssp = NULL;
1371 sess_data->func = NULL;
1372 sess_data->result = rc;
1375 static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
1379 type = select_sectype(ses->server, ses->sectype);
1380 cifs_dbg(FYI, "sess setup type %d\n", type);
1381 if (type == Unspecified) {
1383 "Unable to select appropriate authentication method!");
1389 /* LANMAN and plaintext are less secure and off by default.
1390 * So we make this explicitly be turned on in kconfig (in the
1391 * build) and turned on at runtime (changed from the default)
1392 * in proc/fs/cifs or via mount parm. Unfortunately this is
1393 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
1394 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1395 sess_data->func = sess_auth_lanman;
1401 sess_data->func = sess_auth_ntlm;
1404 sess_data->func = sess_auth_ntlmv2;
1407 #ifdef CONFIG_CIFS_UPCALL
1408 sess_data->func = sess_auth_kerberos;
1411 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1414 #endif /* CONFIG_CIFS_UPCALL */
1416 sess_data->func = sess_auth_rawntlmssp_negotiate;
1419 cifs_dbg(VFS, "secType %d not supported!\n", type);
1426 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1427 const struct nls_table *nls_cp)
1430 struct sess_data *sess_data;
1433 WARN(1, "%s: ses == NULL!", __func__);
1437 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1441 rc = select_sec(ses, sess_data);
1445 sess_data->xid = xid;
1446 sess_data->ses = ses;
1447 sess_data->buf0_type = CIFS_NO_BUFFER;
1448 sess_data->nls_cp = (struct nls_table *) nls_cp;
1450 while (sess_data->func)
1451 sess_data->func(sess_data);
1453 /* Store result before we free sess_data */
1454 rc = sess_data->result;