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 pSMB->req_no_secext.CaseInsensitivePasswordLength =
785 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
786 pSMB->req_no_secext.CaseSensitivePasswordLength =
787 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
789 /* calculate ntlm response and session key */
790 rc = setup_ntlm_response(ses, sess_data->nls_cp);
792 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
797 /* copy ntlm response */
798 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
799 CIFS_AUTH_RESP_SIZE);
800 bcc_ptr += CIFS_AUTH_RESP_SIZE;
801 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
802 CIFS_AUTH_RESP_SIZE);
803 bcc_ptr += CIFS_AUTH_RESP_SIZE;
805 if (ses->capabilities & CAP_UNICODE) {
806 /* unicode strings must be word aligned */
807 if (sess_data->iov[0].iov_len % 2) {
811 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
813 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
817 sess_data->iov[2].iov_len = (long) bcc_ptr -
818 (long) sess_data->iov[2].iov_base;
820 rc = sess_sendreceive(sess_data);
824 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
825 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
827 if (smb_buf->WordCount != 3) {
829 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
833 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
834 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
836 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
837 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
839 bytes_remaining = get_bcc(smb_buf);
840 bcc_ptr = pByteArea(smb_buf);
842 /* BB check if Unicode and decode strings */
843 if (bytes_remaining == 0) {
844 /* no string area to decode, do nothing */
845 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
846 /* unicode string area must be word-aligned */
847 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
851 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
854 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
858 rc = sess_establish_session(sess_data);
860 sess_data->result = rc;
861 sess_data->func = NULL;
862 sess_free_buffer(sess_data);
863 kfree(ses->auth_key.response);
864 ses->auth_key.response = NULL;
868 sess_auth_ntlmv2(struct sess_data *sess_data)
871 struct smb_hdr *smb_buf;
872 SESSION_SETUP_ANDX *pSMB;
874 struct cifs_ses *ses = sess_data->ses;
876 __u16 bytes_remaining;
878 /* old style NTLM sessionsetup */
880 rc = sess_alloc_buffer(sess_data, 13);
884 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
885 bcc_ptr = sess_data->iov[2].iov_base;
886 capabilities = cifs_ssetup_hdr(ses, pSMB);
888 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
890 /* LM2 password would be here if we supported it */
891 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
893 /* calculate nlmv2 response and session key */
894 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
896 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
900 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
901 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
902 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
904 /* set case sensitive password length after tilen may get
905 * assigned, tilen is 0 otherwise.
907 pSMB->req_no_secext.CaseSensitivePasswordLength =
908 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
910 if (ses->capabilities & CAP_UNICODE) {
911 if (sess_data->iov[0].iov_len % 2) {
915 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
917 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
921 sess_data->iov[2].iov_len = (long) bcc_ptr -
922 (long) sess_data->iov[2].iov_base;
924 rc = sess_sendreceive(sess_data);
928 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
929 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
931 if (smb_buf->WordCount != 3) {
933 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
937 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
938 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
940 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
941 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
943 bytes_remaining = get_bcc(smb_buf);
944 bcc_ptr = pByteArea(smb_buf);
946 /* BB check if Unicode and decode strings */
947 if (bytes_remaining == 0) {
948 /* no string area to decode, do nothing */
949 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
950 /* unicode string area must be word-aligned */
951 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
955 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
958 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
962 rc = sess_establish_session(sess_data);
964 sess_data->result = rc;
965 sess_data->func = NULL;
966 sess_free_buffer(sess_data);
967 kfree(ses->auth_key.response);
968 ses->auth_key.response = NULL;
971 #ifdef CONFIG_CIFS_UPCALL
973 sess_auth_kerberos(struct sess_data *sess_data)
976 struct smb_hdr *smb_buf;
977 SESSION_SETUP_ANDX *pSMB;
979 struct cifs_ses *ses = sess_data->ses;
981 __u16 bytes_remaining;
982 struct key *spnego_key = NULL;
983 struct cifs_spnego_msg *msg;
986 /* extended security */
988 rc = sess_alloc_buffer(sess_data, 12);
992 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
993 bcc_ptr = sess_data->iov[2].iov_base;
994 capabilities = cifs_ssetup_hdr(ses, pSMB);
996 spnego_key = cifs_get_spnego_key(ses);
997 if (IS_ERR(spnego_key)) {
998 rc = PTR_ERR(spnego_key);
1003 msg = spnego_key->payload.data[0];
1005 * check version field to make sure that cifs.upcall is
1006 * sending us a response in an expected form
1008 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1010 "incorrect version of cifs.upcall (expected %d but got %d)",
1011 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1013 goto out_put_spnego_key;
1016 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1018 if (!ses->auth_key.response) {
1019 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory",
1022 goto out_put_spnego_key;
1024 ses->auth_key.len = msg->sesskey_len;
1026 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1027 capabilities |= CAP_EXTENDED_SECURITY;
1028 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1029 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1030 sess_data->iov[1].iov_len = msg->secblob_len;
1031 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1033 if (ses->capabilities & CAP_UNICODE) {
1034 /* unicode strings must be word aligned */
1035 if ((sess_data->iov[0].iov_len
1036 + sess_data->iov[1].iov_len) % 2) {
1040 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1041 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1043 /* BB: is this right? */
1044 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1047 sess_data->iov[2].iov_len = (long) bcc_ptr -
1048 (long) sess_data->iov[2].iov_base;
1050 rc = sess_sendreceive(sess_data);
1052 goto out_put_spnego_key;
1054 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1055 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1057 if (smb_buf->WordCount != 4) {
1059 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1060 goto out_put_spnego_key;
1063 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1064 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1066 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1067 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1069 bytes_remaining = get_bcc(smb_buf);
1070 bcc_ptr = pByteArea(smb_buf);
1072 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1073 if (blob_len > bytes_remaining) {
1074 cifs_dbg(VFS, "bad security blob length %d\n",
1077 goto out_put_spnego_key;
1079 bcc_ptr += blob_len;
1080 bytes_remaining -= blob_len;
1082 /* BB check if Unicode and decode strings */
1083 if (bytes_remaining == 0) {
1084 /* no string area to decode, do nothing */
1085 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1086 /* unicode string area must be word-aligned */
1087 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1091 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1094 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1098 rc = sess_establish_session(sess_data);
1100 key_invalidate(spnego_key);
1101 key_put(spnego_key);
1103 sess_data->result = rc;
1104 sess_data->func = NULL;
1105 sess_free_buffer(sess_data);
1106 kfree(ses->auth_key.response);
1107 ses->auth_key.response = NULL;
1110 #endif /* ! CONFIG_CIFS_UPCALL */
1113 * The required kvec buffers have to be allocated before calling this
1117 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1119 struct smb_hdr *smb_buf;
1120 SESSION_SETUP_ANDX *pSMB;
1121 struct cifs_ses *ses = sess_data->ses;
1125 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1126 smb_buf = (struct smb_hdr *)pSMB;
1128 capabilities = cifs_ssetup_hdr(ses, pSMB);
1129 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1130 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1134 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1135 capabilities |= CAP_EXTENDED_SECURITY;
1136 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1138 bcc_ptr = sess_data->iov[2].iov_base;
1139 /* unicode strings must be word aligned */
1140 if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1144 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1146 sess_data->iov[2].iov_len = (long) bcc_ptr -
1147 (long) sess_data->iov[2].iov_base;
1153 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1156 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1159 struct smb_hdr *smb_buf;
1160 SESSION_SETUP_ANDX *pSMB;
1161 struct cifs_ses *ses = sess_data->ses;
1162 __u16 bytes_remaining;
1166 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1169 * if memory allocation is successful, caller of this function
1172 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1173 if (!ses->ntlmssp) {
1177 ses->ntlmssp->sesskey_per_smbsess = false;
1180 rc = sess_alloc_buffer(sess_data, 12);
1184 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1186 /* Build security blob before we assemble the request */
1187 build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
1188 sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
1189 sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
1190 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
1192 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1196 rc = sess_sendreceive(sess_data);
1198 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1199 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1201 /* If true, rc here is expected and not an error */
1202 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1203 smb_buf->Status.CifsError ==
1204 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1210 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1212 if (smb_buf->WordCount != 4) {
1214 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1218 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1219 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1221 bytes_remaining = get_bcc(smb_buf);
1222 bcc_ptr = pByteArea(smb_buf);
1224 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1225 if (blob_len > bytes_remaining) {
1226 cifs_dbg(VFS, "bad security blob length %d\n",
1232 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1234 sess_free_buffer(sess_data);
1237 sess_data->func = sess_auth_rawntlmssp_authenticate;
1241 /* Else error. Cleanup */
1242 kfree(ses->auth_key.response);
1243 ses->auth_key.response = NULL;
1244 kfree(ses->ntlmssp);
1245 ses->ntlmssp = NULL;
1247 sess_data->func = NULL;
1248 sess_data->result = rc;
1252 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1255 struct smb_hdr *smb_buf;
1256 SESSION_SETUP_ANDX *pSMB;
1257 struct cifs_ses *ses = sess_data->ses;
1258 __u16 bytes_remaining;
1260 char *ntlmsspblob = NULL;
1263 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1266 rc = sess_alloc_buffer(sess_data, 12);
1270 /* Build security blob before we assemble the request */
1271 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1272 smb_buf = (struct smb_hdr *)pSMB;
1274 * 5 is an empirical value, large enough to hold
1275 * authenticate message plus max 10 of av paris,
1276 * domain, user, workstation names, flags, etc.
1278 ntlmsspblob = kzalloc(5*sizeof(struct _AUTHENTICATE_MESSAGE),
1285 rc = build_ntlmssp_auth_blob(ntlmsspblob,
1286 &blob_len, ses, sess_data->nls_cp);
1288 goto out_free_ntlmsspblob;
1289 sess_data->iov[1].iov_len = blob_len;
1290 sess_data->iov[1].iov_base = ntlmsspblob;
1291 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1293 * Make sure that we tell the server that we are using
1294 * the uid that it just gave us back on the response
1297 smb_buf->Uid = ses->Suid;
1299 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1301 goto out_free_ntlmsspblob;
1303 rc = sess_sendreceive(sess_data);
1305 goto out_free_ntlmsspblob;
1307 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1308 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1309 if (smb_buf->WordCount != 4) {
1311 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1312 goto out_free_ntlmsspblob;
1315 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1316 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1318 if (ses->Suid != smb_buf->Uid) {
1319 ses->Suid = smb_buf->Uid;
1320 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1323 bytes_remaining = get_bcc(smb_buf);
1324 bcc_ptr = pByteArea(smb_buf);
1325 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1326 if (blob_len > bytes_remaining) {
1327 cifs_dbg(VFS, "bad security blob length %d\n",
1330 goto out_free_ntlmsspblob;
1332 bcc_ptr += blob_len;
1333 bytes_remaining -= blob_len;
1336 /* BB check if Unicode and decode strings */
1337 if (bytes_remaining == 0) {
1338 /* no string area to decode, do nothing */
1339 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1340 /* unicode string area must be word-aligned */
1341 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1345 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1348 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1352 out_free_ntlmsspblob:
1355 sess_free_buffer(sess_data);
1358 rc = sess_establish_session(sess_data);
1361 kfree(ses->auth_key.response);
1362 ses->auth_key.response = NULL;
1363 kfree(ses->ntlmssp);
1364 ses->ntlmssp = NULL;
1366 sess_data->func = NULL;
1367 sess_data->result = rc;
1370 static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
1374 type = select_sectype(ses->server, ses->sectype);
1375 cifs_dbg(FYI, "sess setup type %d\n", type);
1376 if (type == Unspecified) {
1378 "Unable to select appropriate authentication method!");
1384 /* LANMAN and plaintext are less secure and off by default.
1385 * So we make this explicitly be turned on in kconfig (in the
1386 * build) and turned on at runtime (changed from the default)
1387 * in proc/fs/cifs or via mount parm. Unfortunately this is
1388 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
1389 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1390 sess_data->func = sess_auth_lanman;
1396 sess_data->func = sess_auth_ntlm;
1399 sess_data->func = sess_auth_ntlmv2;
1402 #ifdef CONFIG_CIFS_UPCALL
1403 sess_data->func = sess_auth_kerberos;
1406 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1409 #endif /* CONFIG_CIFS_UPCALL */
1411 sess_data->func = sess_auth_rawntlmssp_negotiate;
1414 cifs_dbg(VFS, "secType %d not supported!\n", type);
1421 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1422 const struct nls_table *nls_cp)
1425 struct sess_data *sess_data;
1428 WARN(1, "%s: ses == NULL!", __func__);
1432 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1436 rc = select_sec(ses, sess_data);
1440 sess_data->xid = xid;
1441 sess_data->ses = ses;
1442 sess_data->buf0_type = CIFS_NO_BUFFER;
1443 sess_data->nls_cp = (struct nls_table *) nls_cp;
1445 while (sess_data->func)
1446 sess_data->func(sess_data);
1448 /* Store result before we free sess_data */
1449 rc = sess_data->result;