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"
34 #include "smb2proto.h"
37 is_server_using_iface(struct TCP_Server_Info *server,
38 struct cifs_server_iface *iface)
40 struct sockaddr_in *i4 = (struct sockaddr_in *)&iface->sockaddr;
41 struct sockaddr_in6 *i6 = (struct sockaddr_in6 *)&iface->sockaddr;
42 struct sockaddr_in *s4 = (struct sockaddr_in *)&server->dstaddr;
43 struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)&server->dstaddr;
45 if (server->dstaddr.ss_family != iface->sockaddr.ss_family)
47 if (server->dstaddr.ss_family == AF_INET) {
48 if (s4->sin_addr.s_addr != i4->sin_addr.s_addr)
50 } else if (server->dstaddr.ss_family == AF_INET6) {
51 if (memcmp(&s6->sin6_addr, &i6->sin6_addr,
52 sizeof(i6->sin6_addr)) != 0)
55 /* unknown family.. */
61 bool is_ses_using_iface(struct cifs_ses *ses, struct cifs_server_iface *iface)
65 for (i = 0; i < ses->chan_count; i++) {
66 if (is_server_using_iface(ses->chans[i].server, iface))
72 /* returns number of channels added */
73 int cifs_try_adding_channels(struct cifs_ses *ses)
75 int old_chan_count = ses->chan_count;
76 int left = ses->chan_max - ses->chan_count;
80 struct cifs_server_iface *ifaces = NULL;
85 "ses already at max_channels (%zu), nothing to open\n",
90 if (ses->server->dialect < SMB30_PROT_ID) {
91 cifs_dbg(VFS, "multichannel is not supported on this protocol version, use 3.0 or above\n");
96 * Make a copy of the iface list at the time and use that
97 * instead so as to not hold the iface spinlock for opening
100 spin_lock(&ses->iface_lock);
101 iface_count = ses->iface_count;
102 if (iface_count <= 0) {
103 spin_unlock(&ses->iface_lock);
104 cifs_dbg(VFS, "no iface list available to open channels\n");
107 ifaces = kmemdup(ses->iface_list, iface_count*sizeof(*ifaces),
110 spin_unlock(&ses->iface_lock);
113 spin_unlock(&ses->iface_lock);
116 * Keep connecting to same, fastest, iface for all channels as
117 * long as its RSS. Try next fastest one if not RSS or channel
121 struct cifs_server_iface *iface;
124 if (tries > 3*ses->chan_max) {
125 cifs_dbg(FYI, "too many channel open attempts (%d channels left to open)\n",
131 if (is_ses_using_iface(ses, iface) && !iface->rss_capable) {
132 i = (i+1) % iface_count;
136 rc = cifs_ses_add_channel(ses, iface);
138 cifs_dbg(FYI, "failed to open extra channel on iface#%d rc=%d\n",
140 i = (i+1) % iface_count;
144 cifs_dbg(FYI, "successfully opened new channel on iface#%d\n",
150 return ses->chan_count - old_chan_count;
154 * If server is a channel of ses, return the corresponding enclosing
155 * cifs_chan otherwise return NULL.
158 cifs_ses_find_chan(struct cifs_ses *ses, struct TCP_Server_Info *server)
162 for (i = 0; i < ses->chan_count; i++) {
163 if (ses->chans[i].server == server)
164 return &ses->chans[i];
170 cifs_ses_add_channel(struct cifs_ses *ses, struct cifs_server_iface *iface)
172 struct cifs_chan *chan;
173 struct smb_vol vol = {NULL};
174 static const char unc_fmt[] = "\\%s\\foo";
175 char unc[sizeof(unc_fmt)+SERVER_NAME_LEN_WITH_NULL] = {0};
176 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;
177 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;
179 unsigned int xid = get_xid();
181 if (iface->sockaddr.ss_family == AF_INET)
182 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI4)\n",
183 ses, iface->speed, iface->rdma_capable ? "yes" : "no",
186 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI4)\n",
187 ses, iface->speed, iface->rdma_capable ? "yes" : "no",
191 * Setup a smb_vol with mostly the same info as the existing
192 * session and overwrite it with the requested iface data.
194 * We need to setup at least the fields used for negprot and
197 * We only need the volume here, so we can reuse memory from
198 * the session and server without caring about memory
202 /* Always make new connection for now (TODO?) */
203 vol.nosharesock = true;
206 vol.domainauto = ses->domainAuto;
207 vol.domainname = ses->domainName;
208 vol.username = ses->user_name;
209 vol.password = ses->password;
210 vol.sectype = ses->sectype;
211 vol.sign = ses->sign;
214 /* XXX: Use ses->server->hostname? */
215 sprintf(unc, unc_fmt, ses->serverName);
219 /* Reuse same version as master connection */
220 vol.vals = ses->server->vals;
221 vol.ops = ses->server->ops;
223 vol.noblocksnd = ses->server->noblocksnd;
224 vol.noautotune = ses->server->noautotune;
225 vol.sockopt_tcp_nodelay = ses->server->tcp_nodelay;
226 vol.echo_interval = ses->server->echo_interval / HZ;
229 * This will be used for encoding/decoding user/domain/pw
230 * during sess setup auth.
232 * XXX: We use the default for simplicity but the proper way
233 * would be to use the one that ses used, which is not
234 * stored. This might break when dealing with non-ascii
237 vol.local_nls = load_nls_default();
239 /* Use RDMA if possible */
240 vol.rdma = iface->rdma_capable;
241 memcpy(&vol.dstaddr, &iface->sockaddr, sizeof(struct sockaddr_storage));
243 /* reuse master con client guid */
244 memcpy(&vol.client_guid, ses->server->client_guid,
245 SMB2_CLIENT_GUID_SIZE);
246 vol.use_client_guid = true;
248 mutex_lock(&ses->session_mutex);
250 chan = ses->binding_chan = &ses->chans[ses->chan_count];
251 chan->server = cifs_get_tcp_session(&vol);
252 if (IS_ERR(chan->server)) {
253 rc = PTR_ERR(chan->server);
257 spin_lock(&cifs_tcp_ses_lock);
258 chan->server->is_channel = true;
259 spin_unlock(&cifs_tcp_ses_lock);
262 * We need to allocate the server crypto now as we will need
263 * to sign packets before we generate the channel signing key
264 * (we sign with the session key)
266 rc = smb311_crypto_shash_allocate(chan->server);
268 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
273 rc = cifs_negotiate_protocol(xid, ses);
277 rc = cifs_setup_session(xid, ses, vol.local_nls);
281 /* success, put it on the list
282 * XXX: sharing ses between 2 tcp servers is not possible, the
283 * way "internal" linked lists works in linux makes element
284 * only able to belong to one list
286 * the binding session is already established so the rest of
287 * the code should be able to look it up, no need to add the
288 * ses to the new server.
292 atomic_set(&ses->chan_seq, 0);
294 ses->binding = false;
295 ses->binding_chan = NULL;
296 mutex_unlock(&ses->session_mutex);
298 if (rc && chan->server)
299 cifs_put_tcp_session(chan->server, 0);
300 unload_nls(vol.local_nls);
305 static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB)
307 __u32 capabilities = 0;
309 /* init fields common to all four types of SessSetup */
310 /* Note that offsets for first seven fields in req struct are same */
311 /* in CIFS Specs so does not matter which of 3 forms of struct */
312 /* that we use in next few lines */
313 /* Note that header is initialized to zero in header_assemble */
314 pSMB->req.AndXCommand = 0xFF;
315 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
316 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
318 pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
319 pSMB->req.VcNumber = cpu_to_le16(1);
321 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
323 /* BB verify whether signing required on neg or just on auth frame
326 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
327 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
329 if (ses->server->sign)
330 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
332 if (ses->capabilities & CAP_UNICODE) {
333 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
334 capabilities |= CAP_UNICODE;
336 if (ses->capabilities & CAP_STATUS32) {
337 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
338 capabilities |= CAP_STATUS32;
340 if (ses->capabilities & CAP_DFS) {
341 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
342 capabilities |= CAP_DFS;
344 if (ses->capabilities & CAP_UNIX)
345 capabilities |= CAP_UNIX;
351 unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
353 char *bcc_ptr = *pbcc_area;
356 /* Copy OS version */
357 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
359 bcc_ptr += 2 * bytes_ret;
360 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
362 bcc_ptr += 2 * bytes_ret;
363 bcc_ptr += 2; /* trailing null */
365 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
367 bcc_ptr += 2 * bytes_ret;
368 bcc_ptr += 2; /* trailing null */
370 *pbcc_area = bcc_ptr;
373 static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
374 const struct nls_table *nls_cp)
376 char *bcc_ptr = *pbcc_area;
380 if (ses->domainName == NULL) {
381 /* Sending null domain better than using a bogus domain name (as
382 we did briefly in 2.6.18) since server will use its default */
387 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
388 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
389 bcc_ptr += 2 * bytes_ret;
390 bcc_ptr += 2; /* account for null terminator */
392 *pbcc_area = bcc_ptr;
396 static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
397 const struct nls_table *nls_cp)
399 char *bcc_ptr = *pbcc_area;
402 /* BB FIXME add check that strings total less
403 than 335 or will need to send them as arrays */
405 /* unicode strings, must be word aligned before the call */
406 /* if ((long) bcc_ptr % 2) {
411 if (ses->user_name == NULL) {
412 /* null user mount */
416 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
417 CIFS_MAX_USERNAME_LEN, nls_cp);
419 bcc_ptr += 2 * bytes_ret;
420 bcc_ptr += 2; /* account for null termination */
422 unicode_domain_string(&bcc_ptr, ses, nls_cp);
423 unicode_oslm_strings(&bcc_ptr, nls_cp);
425 *pbcc_area = bcc_ptr;
428 static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
429 const struct nls_table *nls_cp)
431 char *bcc_ptr = *pbcc_area;
435 /* BB what about null user mounts - check that we do this BB */
437 if (ses->user_name != NULL) {
438 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
439 if (WARN_ON_ONCE(len < 0))
440 len = CIFS_MAX_USERNAME_LEN - 1;
443 /* else null user mount */
445 bcc_ptr++; /* account for null termination */
448 if (ses->domainName != NULL) {
449 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
450 if (WARN_ON_ONCE(len < 0))
451 len = CIFS_MAX_DOMAINNAME_LEN - 1;
453 } /* else we will send a null domain name
454 so the server will default to its own domain */
458 /* BB check for overflow here */
460 strcpy(bcc_ptr, "Linux version ");
461 bcc_ptr += strlen("Linux version ");
462 strcpy(bcc_ptr, init_utsname()->release);
463 bcc_ptr += strlen(init_utsname()->release) + 1;
465 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
466 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
468 *pbcc_area = bcc_ptr;
472 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
473 const struct nls_table *nls_cp)
476 char *data = *pbcc_area;
478 cifs_dbg(FYI, "bleft %d\n", bleft);
480 kfree(ses->serverOS);
481 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
482 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
483 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
489 kfree(ses->serverNOS);
490 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
491 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
492 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
498 kfree(ses->serverDomain);
499 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
500 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
505 static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
506 struct cifs_ses *ses,
507 const struct nls_table *nls_cp)
510 char *bcc_ptr = *pbcc_area;
512 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
514 len = strnlen(bcc_ptr, bleft);
518 kfree(ses->serverOS);
520 ses->serverOS = kmalloc(len + 1, GFP_KERNEL);
522 memcpy(ses->serverOS, bcc_ptr, len);
523 ses->serverOS[len] = 0;
524 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
525 cifs_dbg(FYI, "OS/2 server\n");
531 len = strnlen(bcc_ptr, bleft);
535 kfree(ses->serverNOS);
537 ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);
538 if (ses->serverNOS) {
539 memcpy(ses->serverNOS, bcc_ptr, len);
540 ses->serverNOS[len] = 0;
546 len = strnlen(bcc_ptr, bleft);
550 /* No domain field in LANMAN case. Domain is
551 returned by old servers in the SMB negprot response */
552 /* BB For newer servers which do not support Unicode,
553 but thus do return domain here we could add parsing
554 for it later, but it is not very important */
555 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
558 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
559 struct cifs_ses *ses)
561 unsigned int tioffset; /* challenge message target info area */
562 unsigned int tilen; /* challenge message target info area length */
564 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
566 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
567 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
571 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
572 cifs_dbg(VFS, "blob signature incorrect %s\n",
576 if (pblob->MessageType != NtLmChallenge) {
577 cifs_dbg(VFS, "Incorrect message type %d\n",
582 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
583 /* BB we could decode pblob->NegotiateFlags; some may be useful */
584 /* In particular we can examine sign flags */
585 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
586 we must set the MIC field of the AUTHENTICATE_MESSAGE */
587 ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags);
588 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
589 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
590 if (tioffset > blob_len || tioffset + tilen > blob_len) {
591 cifs_dbg(VFS, "tioffset + tilen too high %u + %u\n",
596 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
598 if (!ses->auth_key.response) {
599 cifs_dbg(VFS, "Challenge target info alloc failure\n");
602 ses->auth_key.len = tilen;
608 /* BB Move to ntlmssp.c eventually */
610 /* We do not malloc the blob, it is passed in pbuffer, because
611 it is fixed size, and small, making this approach cleaner */
612 void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
613 struct cifs_ses *ses)
615 struct TCP_Server_Info *server = cifs_ses_server(ses);
616 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer;
619 memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
620 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
621 sec_blob->MessageType = NtLmNegotiate;
623 /* BB is NTLMV2 session security format easier to use here? */
624 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
625 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
626 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
627 NTLMSSP_NEGOTIATE_SEAL;
629 flags |= NTLMSSP_NEGOTIATE_SIGN;
630 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
631 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
633 sec_blob->NegotiateFlags = cpu_to_le32(flags);
635 sec_blob->WorkstationName.BufferOffset = 0;
636 sec_blob->WorkstationName.Length = 0;
637 sec_blob->WorkstationName.MaximumLength = 0;
639 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
640 sec_blob->DomainName.BufferOffset = 0;
641 sec_blob->DomainName.Length = 0;
642 sec_blob->DomainName.MaximumLength = 0;
645 static int size_of_ntlmssp_blob(struct cifs_ses *ses)
647 int sz = sizeof(AUTHENTICATE_MESSAGE) + ses->auth_key.len
648 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
651 sz += 2 * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
656 sz += 2 * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
663 int build_ntlmssp_auth_blob(unsigned char **pbuffer,
665 struct cifs_ses *ses,
666 const struct nls_table *nls_cp)
669 AUTHENTICATE_MESSAGE *sec_blob;
673 rc = setup_ntlmv2_rsp(ses, nls_cp);
675 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
677 goto setup_ntlmv2_ret;
679 *pbuffer = kmalloc(size_of_ntlmssp_blob(ses), GFP_KERNEL);
682 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
684 goto setup_ntlmv2_ret;
686 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
688 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
689 sec_blob->MessageType = NtLmAuthenticate;
691 flags = NTLMSSP_NEGOTIATE_56 |
692 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
693 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
694 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
695 NTLMSSP_NEGOTIATE_SEAL;
696 if (ses->server->sign)
697 flags |= NTLMSSP_NEGOTIATE_SIGN;
698 if (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
699 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
701 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
702 sec_blob->NegotiateFlags = cpu_to_le32(flags);
704 sec_blob->LmChallengeResponse.BufferOffset =
705 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
706 sec_blob->LmChallengeResponse.Length = 0;
707 sec_blob->LmChallengeResponse.MaximumLength = 0;
709 sec_blob->NtChallengeResponse.BufferOffset =
710 cpu_to_le32(tmp - *pbuffer);
711 if (ses->user_name != NULL) {
712 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
713 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
714 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
716 sec_blob->NtChallengeResponse.Length =
717 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
718 sec_blob->NtChallengeResponse.MaximumLength =
719 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
722 * don't send an NT Response for anonymous access
724 sec_blob->NtChallengeResponse.Length = 0;
725 sec_blob->NtChallengeResponse.MaximumLength = 0;
728 if (ses->domainName == NULL) {
729 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
730 sec_blob->DomainName.Length = 0;
731 sec_blob->DomainName.MaximumLength = 0;
735 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
736 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
737 len *= 2; /* unicode is 2 bytes each */
738 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
739 sec_blob->DomainName.Length = cpu_to_le16(len);
740 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
744 if (ses->user_name == NULL) {
745 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
746 sec_blob->UserName.Length = 0;
747 sec_blob->UserName.MaximumLength = 0;
751 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
752 CIFS_MAX_USERNAME_LEN, nls_cp);
753 len *= 2; /* unicode is 2 bytes each */
754 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
755 sec_blob->UserName.Length = cpu_to_le16(len);
756 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
760 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
761 sec_blob->WorkstationName.Length = 0;
762 sec_blob->WorkstationName.MaximumLength = 0;
765 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
766 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
767 && !calc_seckey(ses)) {
768 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
769 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
770 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
771 sec_blob->SessionKey.MaximumLength =
772 cpu_to_le16(CIFS_CPHTXT_SIZE);
773 tmp += CIFS_CPHTXT_SIZE;
775 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
776 sec_blob->SessionKey.Length = 0;
777 sec_blob->SessionKey.MaximumLength = 0;
780 *buflen = tmp - *pbuffer;
786 cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
788 switch (server->negflavor) {
789 case CIFS_NEGFLAVOR_EXTENDED:
795 if (server->sec_ntlmssp &&
796 (global_secflags & CIFSSEC_MAY_NTLMSSP))
798 if ((server->sec_kerberos || server->sec_mskerberos) &&
799 (global_secflags & CIFSSEC_MAY_KRB5))
805 case CIFS_NEGFLAVOR_UNENCAP:
811 if (global_secflags & CIFSSEC_MAY_NTLMV2)
813 if (global_secflags & CIFSSEC_MAY_NTLM)
818 fallthrough; /* to attempt LANMAN authentication next */
819 case CIFS_NEGFLAVOR_LANMAN:
824 if (global_secflags & CIFSSEC_MAY_LANMAN)
837 struct cifs_ses *ses;
838 struct nls_table *nls_cp;
839 void (*func)(struct sess_data *);
842 /* we will send the SMB in three pieces:
843 * a fixed length beginning part, an optional
844 * SPNEGO blob (which can be zero length), and a
845 * last part which will include the strings
846 * and rest of bcc area. This allows us to avoid
847 * a large buffer 17K allocation
854 sess_alloc_buffer(struct sess_data *sess_data, int wct)
857 struct cifs_ses *ses = sess_data->ses;
858 struct smb_hdr *smb_buf;
860 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
866 sess_data->iov[0].iov_base = (char *)smb_buf;
867 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
869 * This variable will be used to clear the buffer
870 * allocated above in case of any error in the calling function.
872 sess_data->buf0_type = CIFS_SMALL_BUFFER;
874 /* 2000 big enough to fit max user, domain, NOS name etc. */
875 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
876 if (!sess_data->iov[2].iov_base) {
878 goto out_free_smb_buf;
885 sess_data->iov[0].iov_base = NULL;
886 sess_data->iov[0].iov_len = 0;
887 sess_data->buf0_type = CIFS_NO_BUFFER;
892 sess_free_buffer(struct sess_data *sess_data)
895 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
896 sess_data->buf0_type = CIFS_NO_BUFFER;
897 kfree(sess_data->iov[2].iov_base);
901 sess_establish_session(struct sess_data *sess_data)
903 struct cifs_ses *ses = sess_data->ses;
905 mutex_lock(&ses->server->srv_mutex);
906 if (!ses->server->session_estab) {
907 if (ses->server->sign) {
908 ses->server->session_key.response =
909 kmemdup(ses->auth_key.response,
910 ses->auth_key.len, GFP_KERNEL);
911 if (!ses->server->session_key.response) {
912 mutex_unlock(&ses->server->srv_mutex);
915 ses->server->session_key.len =
918 ses->server->sequence_number = 0x2;
919 ses->server->session_estab = true;
921 mutex_unlock(&ses->server->srv_mutex);
923 cifs_dbg(FYI, "CIFS session established successfully\n");
924 spin_lock(&GlobalMid_Lock);
925 ses->status = CifsGood;
926 ses->need_reconnect = false;
927 spin_unlock(&GlobalMid_Lock);
933 sess_sendreceive(struct sess_data *sess_data)
936 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
938 struct kvec rsp_iov = { NULL, 0 };
940 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
941 be32_add_cpu(&smb_buf->smb_buf_length, count);
942 put_bcc(count, smb_buf);
944 rc = SendReceive2(sess_data->xid, sess_data->ses,
945 sess_data->iov, 3 /* num_iovecs */,
946 &sess_data->buf0_type,
947 CIFS_LOG_ERROR, &rsp_iov);
948 cifs_small_buf_release(sess_data->iov[0].iov_base);
949 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
955 * LANMAN and plaintext are less secure and off by default.
956 * So we make this explicitly be turned on in kconfig (in the
957 * build) and turned on at runtime (changed from the default)
958 * in proc/fs/cifs or via mount parm. Unfortunately this is
959 * needed for old Win (e.g. Win95), some obscure NAS and OS/2
961 #ifdef CONFIG_CIFS_WEAK_PW_HASH
963 sess_auth_lanman(struct sess_data *sess_data)
966 struct smb_hdr *smb_buf;
967 SESSION_SETUP_ANDX *pSMB;
969 struct cifs_ses *ses = sess_data->ses;
970 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
971 __u16 bytes_remaining;
973 /* lanman 2 style sessionsetup */
975 rc = sess_alloc_buffer(sess_data, 10);
979 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
980 bcc_ptr = sess_data->iov[2].iov_base;
981 (void)cifs_ssetup_hdr(ses, pSMB);
983 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
985 if (ses->user_name != NULL) {
986 /* no capabilities flags in old lanman negotiation */
987 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
989 /* Calculate hash with password and copy into bcc_ptr.
990 * Encryption Key (stored as in cryptkey) gets used if the
991 * security mode bit in Negotiate Protocol response states
992 * to use challenge/response method (i.e. Password bit is 1).
994 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
995 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
996 true : false, lnm_session_key);
1000 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
1001 bcc_ptr += CIFS_AUTH_RESP_SIZE;
1003 pSMB->old_req.PasswordLength = 0;
1007 * can not sign if LANMAN negotiated so no need
1008 * to calculate signing key? but what if server
1009 * changed to do higher than lanman dialect and
1010 * we reconnected would we ever calc signing_key?
1013 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
1014 /* Unicode not allowed for LANMAN dialects */
1015 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1017 sess_data->iov[2].iov_len = (long) bcc_ptr -
1018 (long) sess_data->iov[2].iov_base;
1020 rc = sess_sendreceive(sess_data);
1024 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1025 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1027 /* lanman response has a word count of 3 */
1028 if (smb_buf->WordCount != 3) {
1030 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1034 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1035 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1037 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1038 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1040 bytes_remaining = get_bcc(smb_buf);
1041 bcc_ptr = pByteArea(smb_buf);
1043 /* BB check if Unicode and decode strings */
1044 if (bytes_remaining == 0) {
1045 /* no string area to decode, do nothing */
1046 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1047 /* unicode string area must be word-aligned */
1048 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1052 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1055 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1059 rc = sess_establish_session(sess_data);
1061 sess_data->result = rc;
1062 sess_data->func = NULL;
1063 sess_free_buffer(sess_data);
1069 sess_auth_ntlm(struct sess_data *sess_data)
1072 struct smb_hdr *smb_buf;
1073 SESSION_SETUP_ANDX *pSMB;
1075 struct cifs_ses *ses = sess_data->ses;
1077 __u16 bytes_remaining;
1079 /* old style NTLM sessionsetup */
1081 rc = sess_alloc_buffer(sess_data, 13);
1085 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1086 bcc_ptr = sess_data->iov[2].iov_base;
1087 capabilities = cifs_ssetup_hdr(ses, pSMB);
1089 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
1090 if (ses->user_name != NULL) {
1091 pSMB->req_no_secext.CaseInsensitivePasswordLength =
1092 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
1093 pSMB->req_no_secext.CaseSensitivePasswordLength =
1094 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
1096 /* calculate ntlm response and session key */
1097 rc = setup_ntlm_response(ses, sess_data->nls_cp);
1099 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
1104 /* copy ntlm response */
1105 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1106 CIFS_AUTH_RESP_SIZE);
1107 bcc_ptr += CIFS_AUTH_RESP_SIZE;
1108 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1109 CIFS_AUTH_RESP_SIZE);
1110 bcc_ptr += CIFS_AUTH_RESP_SIZE;
1112 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
1113 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
1116 if (ses->capabilities & CAP_UNICODE) {
1117 /* unicode strings must be word aligned */
1118 if (sess_data->iov[0].iov_len % 2) {
1122 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1124 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1128 sess_data->iov[2].iov_len = (long) bcc_ptr -
1129 (long) sess_data->iov[2].iov_base;
1131 rc = sess_sendreceive(sess_data);
1135 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1136 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1138 if (smb_buf->WordCount != 3) {
1140 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1144 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1145 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1147 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1148 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1150 bytes_remaining = get_bcc(smb_buf);
1151 bcc_ptr = pByteArea(smb_buf);
1153 /* BB check if Unicode and decode strings */
1154 if (bytes_remaining == 0) {
1155 /* no string area to decode, do nothing */
1156 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1157 /* unicode string area must be word-aligned */
1158 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1162 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1165 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1169 rc = sess_establish_session(sess_data);
1171 sess_data->result = rc;
1172 sess_data->func = NULL;
1173 sess_free_buffer(sess_data);
1174 kfree(ses->auth_key.response);
1175 ses->auth_key.response = NULL;
1179 sess_auth_ntlmv2(struct sess_data *sess_data)
1182 struct smb_hdr *smb_buf;
1183 SESSION_SETUP_ANDX *pSMB;
1185 struct cifs_ses *ses = sess_data->ses;
1187 __u16 bytes_remaining;
1189 /* old style NTLM sessionsetup */
1191 rc = sess_alloc_buffer(sess_data, 13);
1195 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1196 bcc_ptr = sess_data->iov[2].iov_base;
1197 capabilities = cifs_ssetup_hdr(ses, pSMB);
1199 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
1201 /* LM2 password would be here if we supported it */
1202 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
1204 if (ses->user_name != NULL) {
1205 /* calculate nlmv2 response and session key */
1206 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
1208 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
1212 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1213 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1214 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1216 /* set case sensitive password length after tilen may get
1217 * assigned, tilen is 0 otherwise.
1219 pSMB->req_no_secext.CaseSensitivePasswordLength =
1220 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1222 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
1225 if (ses->capabilities & CAP_UNICODE) {
1226 if (sess_data->iov[0].iov_len % 2) {
1230 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1232 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1236 sess_data->iov[2].iov_len = (long) bcc_ptr -
1237 (long) sess_data->iov[2].iov_base;
1239 rc = sess_sendreceive(sess_data);
1243 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1244 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1246 if (smb_buf->WordCount != 3) {
1248 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1252 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1253 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1255 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1256 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1258 bytes_remaining = get_bcc(smb_buf);
1259 bcc_ptr = pByteArea(smb_buf);
1261 /* BB check if Unicode and decode strings */
1262 if (bytes_remaining == 0) {
1263 /* no string area to decode, do nothing */
1264 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1265 /* unicode string area must be word-aligned */
1266 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1270 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1273 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1277 rc = sess_establish_session(sess_data);
1279 sess_data->result = rc;
1280 sess_data->func = NULL;
1281 sess_free_buffer(sess_data);
1282 kfree(ses->auth_key.response);
1283 ses->auth_key.response = NULL;
1286 #ifdef CONFIG_CIFS_UPCALL
1288 sess_auth_kerberos(struct sess_data *sess_data)
1291 struct smb_hdr *smb_buf;
1292 SESSION_SETUP_ANDX *pSMB;
1294 struct cifs_ses *ses = sess_data->ses;
1296 __u16 bytes_remaining;
1297 struct key *spnego_key = NULL;
1298 struct cifs_spnego_msg *msg;
1301 /* extended security */
1303 rc = sess_alloc_buffer(sess_data, 12);
1307 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1308 bcc_ptr = sess_data->iov[2].iov_base;
1309 capabilities = cifs_ssetup_hdr(ses, pSMB);
1311 spnego_key = cifs_get_spnego_key(ses);
1312 if (IS_ERR(spnego_key)) {
1313 rc = PTR_ERR(spnego_key);
1318 msg = spnego_key->payload.data[0];
1320 * check version field to make sure that cifs.upcall is
1321 * sending us a response in an expected form
1323 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1324 cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n",
1325 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1327 goto out_put_spnego_key;
1330 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1332 if (!ses->auth_key.response) {
1333 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1336 goto out_put_spnego_key;
1338 ses->auth_key.len = msg->sesskey_len;
1340 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1341 capabilities |= CAP_EXTENDED_SECURITY;
1342 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1343 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1344 sess_data->iov[1].iov_len = msg->secblob_len;
1345 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1347 if (ses->capabilities & CAP_UNICODE) {
1348 /* unicode strings must be word aligned */
1349 if ((sess_data->iov[0].iov_len
1350 + sess_data->iov[1].iov_len) % 2) {
1354 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1355 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1357 /* BB: is this right? */
1358 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1361 sess_data->iov[2].iov_len = (long) bcc_ptr -
1362 (long) sess_data->iov[2].iov_base;
1364 rc = sess_sendreceive(sess_data);
1366 goto out_put_spnego_key;
1368 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1369 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1371 if (smb_buf->WordCount != 4) {
1373 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1374 goto out_put_spnego_key;
1377 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1378 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1380 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1381 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1383 bytes_remaining = get_bcc(smb_buf);
1384 bcc_ptr = pByteArea(smb_buf);
1386 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1387 if (blob_len > bytes_remaining) {
1388 cifs_dbg(VFS, "bad security blob length %d\n",
1391 goto out_put_spnego_key;
1393 bcc_ptr += blob_len;
1394 bytes_remaining -= blob_len;
1396 /* BB check if Unicode and decode strings */
1397 if (bytes_remaining == 0) {
1398 /* no string area to decode, do nothing */
1399 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1400 /* unicode string area must be word-aligned */
1401 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1405 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1408 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1412 rc = sess_establish_session(sess_data);
1414 key_invalidate(spnego_key);
1415 key_put(spnego_key);
1417 sess_data->result = rc;
1418 sess_data->func = NULL;
1419 sess_free_buffer(sess_data);
1420 kfree(ses->auth_key.response);
1421 ses->auth_key.response = NULL;
1424 #endif /* ! CONFIG_CIFS_UPCALL */
1427 * The required kvec buffers have to be allocated before calling this
1431 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1433 SESSION_SETUP_ANDX *pSMB;
1434 struct cifs_ses *ses = sess_data->ses;
1438 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1440 capabilities = cifs_ssetup_hdr(ses, pSMB);
1441 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1442 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1446 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1447 capabilities |= CAP_EXTENDED_SECURITY;
1448 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1450 bcc_ptr = sess_data->iov[2].iov_base;
1451 /* unicode strings must be word aligned */
1452 if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1456 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1458 sess_data->iov[2].iov_len = (long) bcc_ptr -
1459 (long) sess_data->iov[2].iov_base;
1465 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1468 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1471 struct smb_hdr *smb_buf;
1472 SESSION_SETUP_ANDX *pSMB;
1473 struct cifs_ses *ses = sess_data->ses;
1474 __u16 bytes_remaining;
1478 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1481 * if memory allocation is successful, caller of this function
1484 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1485 if (!ses->ntlmssp) {
1489 ses->ntlmssp->sesskey_per_smbsess = false;
1492 rc = sess_alloc_buffer(sess_data, 12);
1496 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1498 /* Build security blob before we assemble the request */
1499 build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
1500 sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
1501 sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
1502 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
1504 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1508 rc = sess_sendreceive(sess_data);
1510 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1511 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1513 /* If true, rc here is expected and not an error */
1514 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1515 smb_buf->Status.CifsError ==
1516 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1522 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1524 if (smb_buf->WordCount != 4) {
1526 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1530 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1531 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1533 bytes_remaining = get_bcc(smb_buf);
1534 bcc_ptr = pByteArea(smb_buf);
1536 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1537 if (blob_len > bytes_remaining) {
1538 cifs_dbg(VFS, "bad security blob length %d\n",
1544 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1546 sess_free_buffer(sess_data);
1549 sess_data->func = sess_auth_rawntlmssp_authenticate;
1553 /* Else error. Cleanup */
1554 kfree(ses->auth_key.response);
1555 ses->auth_key.response = NULL;
1556 kfree(ses->ntlmssp);
1557 ses->ntlmssp = NULL;
1559 sess_data->func = NULL;
1560 sess_data->result = rc;
1564 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1567 struct smb_hdr *smb_buf;
1568 SESSION_SETUP_ANDX *pSMB;
1569 struct cifs_ses *ses = sess_data->ses;
1570 __u16 bytes_remaining;
1572 unsigned char *ntlmsspblob = NULL;
1575 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1578 rc = sess_alloc_buffer(sess_data, 12);
1582 /* Build security blob before we assemble the request */
1583 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1584 smb_buf = (struct smb_hdr *)pSMB;
1585 rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1586 &blob_len, ses, sess_data->nls_cp);
1588 goto out_free_ntlmsspblob;
1589 sess_data->iov[1].iov_len = blob_len;
1590 sess_data->iov[1].iov_base = ntlmsspblob;
1591 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1593 * Make sure that we tell the server that we are using
1594 * the uid that it just gave us back on the response
1597 smb_buf->Uid = ses->Suid;
1599 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1601 goto out_free_ntlmsspblob;
1603 rc = sess_sendreceive(sess_data);
1605 goto out_free_ntlmsspblob;
1607 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1608 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1609 if (smb_buf->WordCount != 4) {
1611 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1612 goto out_free_ntlmsspblob;
1615 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1616 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1618 if (ses->Suid != smb_buf->Uid) {
1619 ses->Suid = smb_buf->Uid;
1620 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1623 bytes_remaining = get_bcc(smb_buf);
1624 bcc_ptr = pByteArea(smb_buf);
1625 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1626 if (blob_len > bytes_remaining) {
1627 cifs_dbg(VFS, "bad security blob length %d\n",
1630 goto out_free_ntlmsspblob;
1632 bcc_ptr += blob_len;
1633 bytes_remaining -= blob_len;
1636 /* BB check if Unicode and decode strings */
1637 if (bytes_remaining == 0) {
1638 /* no string area to decode, do nothing */
1639 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1640 /* unicode string area must be word-aligned */
1641 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1645 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1648 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1652 out_free_ntlmsspblob:
1655 sess_free_buffer(sess_data);
1658 rc = sess_establish_session(sess_data);
1661 kfree(ses->auth_key.response);
1662 ses->auth_key.response = NULL;
1663 kfree(ses->ntlmssp);
1664 ses->ntlmssp = NULL;
1666 sess_data->func = NULL;
1667 sess_data->result = rc;
1670 static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
1674 type = cifs_select_sectype(ses->server, ses->sectype);
1675 cifs_dbg(FYI, "sess setup type %d\n", type);
1676 if (type == Unspecified) {
1677 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1683 /* LANMAN and plaintext are less secure and off by default.
1684 * So we make this explicitly be turned on in kconfig (in the
1685 * build) and turned on at runtime (changed from the default)
1686 * in proc/fs/cifs or via mount parm. Unfortunately this is
1687 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
1688 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1689 sess_data->func = sess_auth_lanman;
1695 sess_data->func = sess_auth_ntlm;
1698 sess_data->func = sess_auth_ntlmv2;
1701 #ifdef CONFIG_CIFS_UPCALL
1702 sess_data->func = sess_auth_kerberos;
1705 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1707 #endif /* CONFIG_CIFS_UPCALL */
1709 sess_data->func = sess_auth_rawntlmssp_negotiate;
1712 cifs_dbg(VFS, "secType %d not supported!\n", type);
1719 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1720 const struct nls_table *nls_cp)
1723 struct sess_data *sess_data;
1726 WARN(1, "%s: ses == NULL!", __func__);
1730 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1734 rc = select_sec(ses, sess_data);
1738 sess_data->xid = xid;
1739 sess_data->ses = ses;
1740 sess_data->buf0_type = CIFS_NO_BUFFER;
1741 sess_data->nls_cp = (struct nls_table *) nls_cp;
1743 while (sess_data->func)
1744 sess_data->func(sess_data);
1746 /* Store result before we free sess_data */
1747 rc = sess_data->result;