?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
gpio: rcar: Fix runtime PM imbalance on error
[linux/fpc-iii.git] / fs / cifs / sess.c
blob43a88e26d26ba5353c92820875b1578f8a82d1b3
1 /*
2 * fs/cifs/sess.c
3 *
4 * SMB/CIFS session setup handling routines
5 *
6 * Copyright (c) International Business Machines Corp., 2006, 2009
7 * Author(s): Steve French (sfrench@us.ibm.com)
8 *
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.
13 *
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.
18 *
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
22 */
23
24 #include "cifspdu.h"
25 #include "cifsglob.h"
26 #include "cifsproto.h"
27 #include "cifs_unicode.h"
28 #include "cifs_debug.h"
29 #include "ntlmssp.h"
30 #include "nterr.h"
31 #include <linux/utsname.h>
32 #include <linux/slab.h>
33 #include "cifs_spnego.h"
34 #include "smb2proto.h"
35
36 bool
37 is_server_using_iface(struct TCP_Server_Info *server,
38 struct cifs_server_iface *iface)
39 {
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;
44
45 if (server->dstaddr.ss_family != iface->sockaddr.ss_family)
46 return false;
47 if (server->dstaddr.ss_family == AF_INET) {
48 if (s4->sin_addr.s_addr != i4->sin_addr.s_addr)
49 return false;
50 } else if (server->dstaddr.ss_family == AF_INET6) {
51 if (memcmp(&s6->sin6_addr, &i6->sin6_addr,
52 sizeof(i6->sin6_addr)) != 0)
53 return false;
54 } else {
55 /* unknown family.. */
56 return false;
57 }
58 return true;
59 }
60
61 bool is_ses_using_iface(struct cifs_ses *ses, struct cifs_server_iface *iface)
62 {
63 int i;
64
65 for (i = 0; i < ses->chan_count; i++) {
66 if (is_server_using_iface(ses->chans[i].server, iface))
67 return true;
68 }
69 return false;
70 }
71
72 /* returns number of channels added */
73 int cifs_try_adding_channels(struct cifs_ses *ses)
74 {
75 int old_chan_count = ses->chan_count;
76 int left = ses->chan_max - ses->chan_count;
77 int i = 0;
78 int rc = 0;
79 int tries = 0;
80 struct cifs_server_iface *ifaces = NULL;
81 size_t iface_count;
82
83 if (left <= 0) {
84 cifs_dbg(FYI,
85 "ses already at max_channels (%zu), nothing to open\n",
86 ses->chan_max);
87 return 0;
88 }
89
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");
92 return 0;
93 }
94
95 /*
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
98 * channels
99 */
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");
105 return 0;
106 }
107 ifaces = kmemdup(ses->iface_list, iface_count*sizeof(*ifaces),
108 GFP_ATOMIC);
109 if (!ifaces) {
110 spin_unlock(&ses->iface_lock);
111 return 0;
112 }
113 spin_unlock(&ses->iface_lock);
114
115 /*
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
118 * creation fails.
119 */
120 while (left > 0) {
121 struct cifs_server_iface *iface;
122
123 tries++;
124 if (tries > 3*ses->chan_max) {
125 cifs_dbg(FYI, "too many attempt at opening channels (%d channels left to open)\n",
126 left);
127 break;
128 }
129
130 iface = &ifaces[i];
131 if (is_ses_using_iface(ses, iface) && !iface->rss_capable) {
132 i = (i+1) % iface_count;
133 continue;
134 }
135
136 rc = cifs_ses_add_channel(ses, iface);
137 if (rc) {
138 cifs_dbg(FYI, "failed to open extra channel on iface#%d rc=%d\n",
139 i, rc);
140 i = (i+1) % iface_count;
141 continue;
142 }
143
144 cifs_dbg(FYI, "successfully opened new channel on iface#%d\n",
145 i);
146 left--;
147 }
148
149 kfree(ifaces);
150 return ses->chan_count - old_chan_count;
151 }
152
153 int
154 cifs_ses_add_channel(struct cifs_ses *ses, struct cifs_server_iface *iface)
155 {
156 struct cifs_chan *chan;
157 struct smb_vol vol = {NULL};
158 static const char unc_fmt[] = "\\%s\\foo";
159 char unc[sizeof(unc_fmt)+SERVER_NAME_LEN_WITH_NULL] = {0};
160 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;
161 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;
162 int rc;
163 unsigned int xid = get_xid();
164
165 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ",
166 ses, iface->speed, iface->rdma_capable ? "yes" : "no");
167 if (iface->sockaddr.ss_family == AF_INET)
168 cifs_dbg(FYI, "ip:%pI4)\n", &ipv4->sin_addr);
169 else
170 cifs_dbg(FYI, "ip:%pI6)\n", &ipv6->sin6_addr);
171
172 /*
173 * Setup a smb_vol with mostly the same info as the existing
174 * session and overwrite it with the requested iface data.
175 *
176 * We need to setup at least the fields used for negprot and
177 * sesssetup.
178 *
179 * We only need the volume here, so we can reuse memory from
180 * the session and server without caring about memory
181 * management.
182 */
183
184 /* Always make new connection for now (TODO?) */
185 vol.nosharesock = true;
186
187 /* Auth */
188 vol.domainauto = ses->domainAuto;
189 vol.domainname = ses->domainName;
190 vol.username = ses->user_name;
191 vol.password = ses->password;
192 vol.sectype = ses->sectype;
193 vol.sign = ses->sign;
194
195 /* UNC and paths */
196 /* XXX: Use ses->server->hostname? */
197 sprintf(unc, unc_fmt, ses->serverName);
198 vol.UNC = unc;
199 vol.prepath = "";
200
201 /* Re-use same version as master connection */
202 vol.vals = ses->server->vals;
203 vol.ops = ses->server->ops;
204
205 vol.noblocksnd = ses->server->noblocksnd;
206 vol.noautotune = ses->server->noautotune;
207 vol.sockopt_tcp_nodelay = ses->server->tcp_nodelay;
208 vol.echo_interval = ses->server->echo_interval / HZ;
209
210 /*
211 * This will be used for encoding/decoding user/domain/pw
212 * during sess setup auth.
213 *
214 * XXX: We use the default for simplicity but the proper way
215 * would be to use the one that ses used, which is not
216 * stored. This might break when dealing with non-ascii
217 * strings.
218 */
219 vol.local_nls = load_nls_default();
220
221 /* Use RDMA if possible */
222 vol.rdma = iface->rdma_capable;
223 memcpy(&vol.dstaddr, &iface->sockaddr, sizeof(struct sockaddr_storage));
224
225 /* reuse master con client guid */
226 memcpy(&vol.client_guid, ses->server->client_guid,
227 SMB2_CLIENT_GUID_SIZE);
228 vol.use_client_guid = true;
229
230 mutex_lock(&ses->session_mutex);
231
232 chan = &ses->chans[ses->chan_count];
233 chan->server = cifs_get_tcp_session(&vol);
234 if (IS_ERR(chan->server)) {
235 rc = PTR_ERR(chan->server);
236 chan->server = NULL;
237 goto out;
238 }
239 spin_lock(&cifs_tcp_ses_lock);
240 chan->server->is_channel = true;
241 spin_unlock(&cifs_tcp_ses_lock);
242
243 /*
244 * We need to allocate the server crypto now as we will need
245 * to sign packets before we generate the channel signing key
246 * (we sign with the session key)
247 */
248 rc = smb311_crypto_shash_allocate(chan->server);
249 if (rc) {
250 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
251 goto out;
252 }
253
254 ses->binding = true;
255 rc = cifs_negotiate_protocol(xid, ses);
256 if (rc)
257 goto out;
258
259 rc = cifs_setup_session(xid, ses, vol.local_nls);
260 if (rc)
261 goto out;
262
263 /* success, put it on the list
264 * XXX: sharing ses between 2 tcp server is not possible, the
265 * way "internal" linked lists works in linux makes element
266 * only able to belong to one list
267 *
268 * the binding session is already established so the rest of
269 * the code should be able to look it up, no need to add the
270 * ses to the new server.
271 */
272
273 ses->chan_count++;
274 atomic_set(&ses->chan_seq, 0);
275 out:
276 ses->binding = false;
277 mutex_unlock(&ses->session_mutex);
278
279 if (rc && chan->server)
280 cifs_put_tcp_session(chan->server, 0);
281 unload_nls(vol.local_nls);
282
283 return rc;
284 }
285
286 static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB)
287 {
288 __u32 capabilities = 0;
289
290 /* init fields common to all four types of SessSetup */
291 /* Note that offsets for first seven fields in req struct are same */
292 /* in CIFS Specs so does not matter which of 3 forms of struct */
293 /* that we use in next few lines */
294 /* Note that header is initialized to zero in header_assemble */
295 pSMB->req.AndXCommand = 0xFF;
296 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
297 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
298 USHRT_MAX));
299 pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
300 pSMB->req.VcNumber = cpu_to_le16(1);
301
302 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
303
304 /* BB verify whether signing required on neg or just on auth frame
305 (and NTLM case) */
306
307 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
308 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
309
310 if (ses->server->sign)
311 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
312
313 if (ses->capabilities & CAP_UNICODE) {
314 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
315 capabilities |= CAP_UNICODE;
316 }
317 if (ses->capabilities & CAP_STATUS32) {
318 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
319 capabilities |= CAP_STATUS32;
320 }
321 if (ses->capabilities & CAP_DFS) {
322 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
323 capabilities |= CAP_DFS;
324 }
325 if (ses->capabilities & CAP_UNIX)
326 capabilities |= CAP_UNIX;
327
328 return capabilities;
329 }
330
331 static void
332 unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
333 {
334 char *bcc_ptr = *pbcc_area;
335 int bytes_ret = 0;
336
337 /* Copy OS version */
338 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
339 nls_cp);
340 bcc_ptr += 2 * bytes_ret;
341 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
342 32, nls_cp);
343 bcc_ptr += 2 * bytes_ret;
344 bcc_ptr += 2; /* trailing null */
345
346 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
347 32, nls_cp);
348 bcc_ptr += 2 * bytes_ret;
349 bcc_ptr += 2; /* trailing null */
350
351 *pbcc_area = bcc_ptr;
352 }
353
354 static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
355 const struct nls_table *nls_cp)
356 {
357 char *bcc_ptr = *pbcc_area;
358 int bytes_ret = 0;
359
360 /* copy domain */
361 if (ses->domainName == NULL) {
362 /* Sending null domain better than using a bogus domain name (as
363 we did briefly in 2.6.18) since server will use its default */
364 *bcc_ptr = 0;
365 *(bcc_ptr+1) = 0;
366 bytes_ret = 0;
367 } else
368 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
369 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
370 bcc_ptr += 2 * bytes_ret;
371 bcc_ptr += 2; /* account for null terminator */
372
373 *pbcc_area = bcc_ptr;
374 }
375
376
377 static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
378 const struct nls_table *nls_cp)
379 {
380 char *bcc_ptr = *pbcc_area;
381 int bytes_ret = 0;
382
383 /* BB FIXME add check that strings total less
384 than 335 or will need to send them as arrays */
385
386 /* unicode strings, must be word aligned before the call */
387 /* if ((long) bcc_ptr % 2) {
388 *bcc_ptr = 0;
389 bcc_ptr++;
390 } */
391 /* copy user */
392 if (ses->user_name == NULL) {
393 /* null user mount */
394 *bcc_ptr = 0;
395 *(bcc_ptr+1) = 0;
396 } else {
397 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
398 CIFS_MAX_USERNAME_LEN, nls_cp);
399 }
400 bcc_ptr += 2 * bytes_ret;
401 bcc_ptr += 2; /* account for null termination */
402
403 unicode_domain_string(&bcc_ptr, ses, nls_cp);
404 unicode_oslm_strings(&bcc_ptr, nls_cp);
405
406 *pbcc_area = bcc_ptr;
407 }
408
409 static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
410 const struct nls_table *nls_cp)
411 {
412 char *bcc_ptr = *pbcc_area;
413 int len;
414
415 /* copy user */
416 /* BB what about null user mounts - check that we do this BB */
417 /* copy user */
418 if (ses->user_name != NULL) {
419 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
420 if (WARN_ON_ONCE(len < 0))
421 len = CIFS_MAX_USERNAME_LEN - 1;
422 bcc_ptr += len;
423 }
424 /* else null user mount */
425 *bcc_ptr = 0;
426 bcc_ptr++; /* account for null termination */
427
428 /* copy domain */
429 if (ses->domainName != NULL) {
430 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
431 if (WARN_ON_ONCE(len < 0))
432 len = CIFS_MAX_DOMAINNAME_LEN - 1;
433 bcc_ptr += len;
434 } /* else we will send a null domain name
435 so the server will default to its own domain */
436 *bcc_ptr = 0;
437 bcc_ptr++;
438
439 /* BB check for overflow here */
440
441 strcpy(bcc_ptr, "Linux version ");
442 bcc_ptr += strlen("Linux version ");
443 strcpy(bcc_ptr, init_utsname()->release);
444 bcc_ptr += strlen(init_utsname()->release) + 1;
445
446 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
447 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
448
449 *pbcc_area = bcc_ptr;
450 }
451
452 static void
453 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
454 const struct nls_table *nls_cp)
455 {
456 int len;
457 char *data = *pbcc_area;
458
459 cifs_dbg(FYI, "bleft %d\n", bleft);
460
461 kfree(ses->serverOS);
462 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
463 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
464 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
465 data += len;
466 bleft -= len;
467 if (bleft <= 0)
468 return;
469
470 kfree(ses->serverNOS);
471 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
472 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
473 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
474 data += len;
475 bleft -= len;
476 if (bleft <= 0)
477 return;
478
479 kfree(ses->serverDomain);
480 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
481 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
482
483 return;
484 }
485
486 static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
487 struct cifs_ses *ses,
488 const struct nls_table *nls_cp)
489 {
490 int len;
491 char *bcc_ptr = *pbcc_area;
492
493 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
494
495 len = strnlen(bcc_ptr, bleft);
496 if (len >= bleft)
497 return;
498
499 kfree(ses->serverOS);
500
501 ses->serverOS = kmalloc(len + 1, GFP_KERNEL);
502 if (ses->serverOS) {
503 memcpy(ses->serverOS, bcc_ptr, len);
504 ses->serverOS[len] = 0;
505 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
506 cifs_dbg(FYI, "OS/2 server\n");
507 }
508
509 bcc_ptr += len + 1;
510 bleft -= len + 1;
511
512 len = strnlen(bcc_ptr, bleft);
513 if (len >= bleft)
514 return;
515
516 kfree(ses->serverNOS);
517
518 ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);
519 if (ses->serverNOS) {
520 memcpy(ses->serverNOS, bcc_ptr, len);
521 ses->serverNOS[len] = 0;
522 }
523
524 bcc_ptr += len + 1;
525 bleft -= len + 1;
526
527 len = strnlen(bcc_ptr, bleft);
528 if (len > bleft)
529 return;
530
531 /* No domain field in LANMAN case. Domain is
532 returned by old servers in the SMB negprot response */
533 /* BB For newer servers which do not support Unicode,
534 but thus do return domain here we could add parsing
535 for it later, but it is not very important */
536 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
537 }
538
539 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
540 struct cifs_ses *ses)
541 {
542 unsigned int tioffset; /* challenge message target info area */
543 unsigned int tilen; /* challenge message target info area length */
544
545 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
546
547 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
548 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
549 return -EINVAL;
550 }
551
552 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
553 cifs_dbg(VFS, "blob signature incorrect %s\n",
554 pblob->Signature);
555 return -EINVAL;
556 }
557 if (pblob->MessageType != NtLmChallenge) {
558 cifs_dbg(VFS, "Incorrect message type %d\n",
559 pblob->MessageType);
560 return -EINVAL;
561 }
562
563 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
564 /* BB we could decode pblob->NegotiateFlags; some may be useful */
565 /* In particular we can examine sign flags */
566 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
567 we must set the MIC field of the AUTHENTICATE_MESSAGE */
568 ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags);
569 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
570 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
571 if (tioffset > blob_len || tioffset + tilen > blob_len) {
572 cifs_dbg(VFS, "tioffset + tilen too high %u + %u",
573 tioffset, tilen);
574 return -EINVAL;
575 }
576 if (tilen) {
577 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
578 GFP_KERNEL);
579 if (!ses->auth_key.response) {
580 cifs_dbg(VFS, "Challenge target info alloc failure");
581 return -ENOMEM;
582 }
583 ses->auth_key.len = tilen;
584 }
585
586 return 0;
587 }
588
589 /* BB Move to ntlmssp.c eventually */
590
591 /* We do not malloc the blob, it is passed in pbuffer, because
592 it is fixed size, and small, making this approach cleaner */
593 void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
594 struct cifs_ses *ses)
595 {
596 struct TCP_Server_Info *server = cifs_ses_server(ses);
597 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer;
598 __u32 flags;
599
600 memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
601 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
602 sec_blob->MessageType = NtLmNegotiate;
603
604 /* BB is NTLMV2 session security format easier to use here? */
605 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
606 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
607 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
608 NTLMSSP_NEGOTIATE_SEAL;
609 if (server->sign)
610 flags |= NTLMSSP_NEGOTIATE_SIGN;
611 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
612 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
613
614 sec_blob->NegotiateFlags = cpu_to_le32(flags);
615
616 sec_blob->WorkstationName.BufferOffset = 0;
617 sec_blob->WorkstationName.Length = 0;
618 sec_blob->WorkstationName.MaximumLength = 0;
619
620 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
621 sec_blob->DomainName.BufferOffset = 0;
622 sec_blob->DomainName.Length = 0;
623 sec_blob->DomainName.MaximumLength = 0;
624 }
625
626 static int size_of_ntlmssp_blob(struct cifs_ses *ses)
627 {
628 int sz = sizeof(AUTHENTICATE_MESSAGE) + ses->auth_key.len
629 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
630
631 if (ses->domainName)
632 sz += 2 * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
633 else
634 sz += 2;
635
636 if (ses->user_name)
637 sz += 2 * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
638 else
639 sz += 2;
640
641 return sz;
642 }
643
644 int build_ntlmssp_auth_blob(unsigned char **pbuffer,
645 u16 *buflen,
646 struct cifs_ses *ses,
647 const struct nls_table *nls_cp)
648 {
649 int rc;
650 AUTHENTICATE_MESSAGE *sec_blob;
651 __u32 flags;
652 unsigned char *tmp;
653
654 rc = setup_ntlmv2_rsp(ses, nls_cp);
655 if (rc) {
656 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
657 *buflen = 0;
658 goto setup_ntlmv2_ret;
659 }
660 *pbuffer = kmalloc(size_of_ntlmssp_blob(ses), GFP_KERNEL);
661 if (!*pbuffer) {
662 rc = -ENOMEM;
663 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
664 *buflen = 0;
665 goto setup_ntlmv2_ret;
666 }
667 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
668
669 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
670 sec_blob->MessageType = NtLmAuthenticate;
671
672 flags = NTLMSSP_NEGOTIATE_56 |
673 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
674 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
675 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
676 NTLMSSP_NEGOTIATE_SEAL;
677 if (ses->server->sign)
678 flags |= NTLMSSP_NEGOTIATE_SIGN;
679 if (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
680 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
681
682 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
683 sec_blob->NegotiateFlags = cpu_to_le32(flags);
684
685 sec_blob->LmChallengeResponse.BufferOffset =
686 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
687 sec_blob->LmChallengeResponse.Length = 0;
688 sec_blob->LmChallengeResponse.MaximumLength = 0;
689
690 sec_blob->NtChallengeResponse.BufferOffset =
691 cpu_to_le32(tmp - *pbuffer);
692 if (ses->user_name != NULL) {
693 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
694 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
695 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
696
697 sec_blob->NtChallengeResponse.Length =
698 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
699 sec_blob->NtChallengeResponse.MaximumLength =
700 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
701 } else {
702 /*
703 * don't send an NT Response for anonymous access
704 */
705 sec_blob->NtChallengeResponse.Length = 0;
706 sec_blob->NtChallengeResponse.MaximumLength = 0;
707 }
708
709 if (ses->domainName == NULL) {
710 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
711 sec_blob->DomainName.Length = 0;
712 sec_blob->DomainName.MaximumLength = 0;
713 tmp += 2;
714 } else {
715 int len;
716 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
717 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
718 len *= 2; /* unicode is 2 bytes each */
719 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
720 sec_blob->DomainName.Length = cpu_to_le16(len);
721 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
722 tmp += len;
723 }
724
725 if (ses->user_name == NULL) {
726 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
727 sec_blob->UserName.Length = 0;
728 sec_blob->UserName.MaximumLength = 0;
729 tmp += 2;
730 } else {
731 int len;
732 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
733 CIFS_MAX_USERNAME_LEN, nls_cp);
734 len *= 2; /* unicode is 2 bytes each */
735 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
736 sec_blob->UserName.Length = cpu_to_le16(len);
737 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
738 tmp += len;
739 }
740
741 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
742 sec_blob->WorkstationName.Length = 0;
743 sec_blob->WorkstationName.MaximumLength = 0;
744 tmp += 2;
745
746 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
747 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
748 && !calc_seckey(ses)) {
749 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
750 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
751 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
752 sec_blob->SessionKey.MaximumLength =
753 cpu_to_le16(CIFS_CPHTXT_SIZE);
754 tmp += CIFS_CPHTXT_SIZE;
755 } else {
756 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
757 sec_blob->SessionKey.Length = 0;
758 sec_blob->SessionKey.MaximumLength = 0;
759 }
760
761 *buflen = tmp - *pbuffer;
762 setup_ntlmv2_ret:
763 return rc;
764 }
765
766 enum securityEnum
767 cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
768 {
769 switch (server->negflavor) {
770 case CIFS_NEGFLAVOR_EXTENDED:
771 switch (requested) {
772 case Kerberos:
773 case RawNTLMSSP:
774 return requested;
775 case Unspecified:
776 if (server->sec_ntlmssp &&
777 (global_secflags & CIFSSEC_MAY_NTLMSSP))
778 return RawNTLMSSP;
779 if ((server->sec_kerberos || server->sec_mskerberos) &&
780 (global_secflags & CIFSSEC_MAY_KRB5))
781 return Kerberos;
782 /* Fallthrough */
783 default:
784 return Unspecified;
785 }
786 case CIFS_NEGFLAVOR_UNENCAP:
787 switch (requested) {
788 case NTLM:
789 case NTLMv2:
790 return requested;
791 case Unspecified:
792 if (global_secflags & CIFSSEC_MAY_NTLMV2)
793 return NTLMv2;
794 if (global_secflags & CIFSSEC_MAY_NTLM)
795 return NTLM;
796 default:
797 break;
798 }
799 /* Fallthrough - to attempt LANMAN authentication next */
800 case CIFS_NEGFLAVOR_LANMAN:
801 switch (requested) {
802 case LANMAN:
803 return requested;
804 case Unspecified:
805 if (global_secflags & CIFSSEC_MAY_LANMAN)
806 return LANMAN;
807 /* Fallthrough */
808 default:
809 return Unspecified;
810 }
811 default:
812 return Unspecified;
813 }
814 }
815
816 struct sess_data {
817 unsigned int xid;
818 struct cifs_ses *ses;
819 struct nls_table *nls_cp;
820 void (*func)(struct sess_data *);
821 int result;
822
823 /* we will send the SMB in three pieces:
824 * a fixed length beginning part, an optional
825 * SPNEGO blob (which can be zero length), and a
826 * last part which will include the strings
827 * and rest of bcc area. This allows us to avoid
828 * a large buffer 17K allocation
829 */
830 int buf0_type;
831 struct kvec iov[3];
832 };
833
834 static int
835 sess_alloc_buffer(struct sess_data *sess_data, int wct)
836 {
837 int rc;
838 struct cifs_ses *ses = sess_data->ses;
839 struct smb_hdr *smb_buf;
840
841 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
842 (void **)&smb_buf);
843
844 if (rc)
845 return rc;
846
847 sess_data->iov[0].iov_base = (char *)smb_buf;
848 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
849 /*
850 * This variable will be used to clear the buffer
851 * allocated above in case of any error in the calling function.
852 */
853 sess_data->buf0_type = CIFS_SMALL_BUFFER;
854
855 /* 2000 big enough to fit max user, domain, NOS name etc. */
856 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
857 if (!sess_data->iov[2].iov_base) {
858 rc = -ENOMEM;
859 goto out_free_smb_buf;
860 }
861
862 return 0;
863
864 out_free_smb_buf:
865 kfree(smb_buf);
866 sess_data->iov[0].iov_base = NULL;
867 sess_data->iov[0].iov_len = 0;
868 sess_data->buf0_type = CIFS_NO_BUFFER;
869 return rc;
870 }
871
872 static void
873 sess_free_buffer(struct sess_data *sess_data)
874 {
875
876 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
877 sess_data->buf0_type = CIFS_NO_BUFFER;
878 kfree(sess_data->iov[2].iov_base);
879 }
880
881 static int
882 sess_establish_session(struct sess_data *sess_data)
883 {
884 struct cifs_ses *ses = sess_data->ses;
885
886 mutex_lock(&ses->server->srv_mutex);
887 if (!ses->server->session_estab) {
888 if (ses->server->sign) {
889 ses->server->session_key.response =
890 kmemdup(ses->auth_key.response,
891 ses->auth_key.len, GFP_KERNEL);
892 if (!ses->server->session_key.response) {
893 mutex_unlock(&ses->server->srv_mutex);
894 return -ENOMEM;
895 }
896 ses->server->session_key.len =
897 ses->auth_key.len;
898 }
899 ses->server->sequence_number = 0x2;
900 ses->server->session_estab = true;
901 }
902 mutex_unlock(&ses->server->srv_mutex);
903
904 cifs_dbg(FYI, "CIFS session established successfully\n");
905 spin_lock(&GlobalMid_Lock);
906 ses->status = CifsGood;
907 ses->need_reconnect = false;
908 spin_unlock(&GlobalMid_Lock);
909
910 return 0;
911 }
912
913 static int
914 sess_sendreceive(struct sess_data *sess_data)
915 {
916 int rc;
917 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
918 __u16 count;
919 struct kvec rsp_iov = { NULL, 0 };
920
921 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
922 smb_buf->smb_buf_length =
923 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
924 put_bcc(count, smb_buf);
925
926 rc = SendReceive2(sess_data->xid, sess_data->ses,
927 sess_data->iov, 3 /* num_iovecs */,
928 &sess_data->buf0_type,
929 CIFS_LOG_ERROR, &rsp_iov);
930 cifs_small_buf_release(sess_data->iov[0].iov_base);
931 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
932
933 return rc;
934 }
935
936 /*
937 * LANMAN and plaintext are less secure and off by default.
938 * So we make this explicitly be turned on in kconfig (in the
939 * build) and turned on at runtime (changed from the default)
940 * in proc/fs/cifs or via mount parm. Unfortunately this is
941 * needed for old Win (e.g. Win95), some obscure NAS and OS/2
942 */
943 #ifdef CONFIG_CIFS_WEAK_PW_HASH
944 static void
945 sess_auth_lanman(struct sess_data *sess_data)
946 {
947 int rc = 0;
948 struct smb_hdr *smb_buf;
949 SESSION_SETUP_ANDX *pSMB;
950 char *bcc_ptr;
951 struct cifs_ses *ses = sess_data->ses;
952 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
953 __u16 bytes_remaining;
954
955 /* lanman 2 style sessionsetup */
956 /* wct = 10 */
957 rc = sess_alloc_buffer(sess_data, 10);
958 if (rc)
959 goto out;
960
961 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
962 bcc_ptr = sess_data->iov[2].iov_base;
963 (void)cifs_ssetup_hdr(ses, pSMB);
964
965 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
966
967 if (ses->user_name != NULL) {
968 /* no capabilities flags in old lanman negotiation */
969 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
970
971 /* Calculate hash with password and copy into bcc_ptr.
972 * Encryption Key (stored as in cryptkey) gets used if the
973 * security mode bit in Negottiate Protocol response states
974 * to use challenge/response method (i.e. Password bit is 1).
975 */
976 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
977 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
978 true : false, lnm_session_key);
979 if (rc)
980 goto out;
981
982 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
983 bcc_ptr += CIFS_AUTH_RESP_SIZE;
984 } else {
985 pSMB->old_req.PasswordLength = 0;
986 }
987
988 /*
989 * can not sign if LANMAN negotiated so no need
990 * to calculate signing key? but what if server
991 * changed to do higher than lanman dialect and
992 * we reconnected would we ever calc signing_key?
993 */
994
995 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
996 /* Unicode not allowed for LANMAN dialects */
997 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
998
999 sess_data->iov[2].iov_len = (long) bcc_ptr -
1000 (long) sess_data->iov[2].iov_base;
1001
1002 rc = sess_sendreceive(sess_data);
1003 if (rc)
1004 goto out;
1005
1006 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1007 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1008
1009 /* lanman response has a word count of 3 */
1010 if (smb_buf->WordCount != 3) {
1011 rc = -EIO;
1012 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1013 goto out;
1014 }
1015
1016 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1017 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1018
1019 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1020 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1021
1022 bytes_remaining = get_bcc(smb_buf);
1023 bcc_ptr = pByteArea(smb_buf);
1024
1025 /* BB check if Unicode and decode strings */
1026 if (bytes_remaining == 0) {
1027 /* no string area to decode, do nothing */
1028 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1029 /* unicode string area must be word-aligned */
1030 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1031 ++bcc_ptr;
1032 --bytes_remaining;
1033 }
1034 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1035 sess_data->nls_cp);
1036 } else {
1037 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1038 sess_data->nls_cp);
1039 }
1040
1041 rc = sess_establish_session(sess_data);
1042 out:
1043 sess_data->result = rc;
1044 sess_data->func = NULL;
1045 sess_free_buffer(sess_data);
1046 }
1047
1048 #endif
1049
1050 static void
1051 sess_auth_ntlm(struct sess_data *sess_data)
1052 {
1053 int rc = 0;
1054 struct smb_hdr *smb_buf;
1055 SESSION_SETUP_ANDX *pSMB;
1056 char *bcc_ptr;
1057 struct cifs_ses *ses = sess_data->ses;
1058 __u32 capabilities;
1059 __u16 bytes_remaining;
1060
1061 /* old style NTLM sessionsetup */
1062 /* wct = 13 */
1063 rc = sess_alloc_buffer(sess_data, 13);
1064 if (rc)
1065 goto out;
1066
1067 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1068 bcc_ptr = sess_data->iov[2].iov_base;
1069 capabilities = cifs_ssetup_hdr(ses, pSMB);
1070
1071 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
1072 if (ses->user_name != NULL) {
1073 pSMB->req_no_secext.CaseInsensitivePasswordLength =
1074 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
1075 pSMB->req_no_secext.CaseSensitivePasswordLength =
1076 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
1077
1078 /* calculate ntlm response and session key */
1079 rc = setup_ntlm_response(ses, sess_data->nls_cp);
1080 if (rc) {
1081 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
1082 rc);
1083 goto out;
1084 }
1085
1086 /* copy ntlm response */
1087 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1088 CIFS_AUTH_RESP_SIZE);
1089 bcc_ptr += CIFS_AUTH_RESP_SIZE;
1090 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1091 CIFS_AUTH_RESP_SIZE);
1092 bcc_ptr += CIFS_AUTH_RESP_SIZE;
1093 } else {
1094 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
1095 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
1096 }
1097
1098 if (ses->capabilities & CAP_UNICODE) {
1099 /* unicode strings must be word aligned */
1100 if (sess_data->iov[0].iov_len % 2) {
1101 *bcc_ptr = 0;
1102 bcc_ptr++;
1103 }
1104 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1105 } else {
1106 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1107 }
1108
1109
1110 sess_data->iov[2].iov_len = (long) bcc_ptr -
1111 (long) sess_data->iov[2].iov_base;
1112
1113 rc = sess_sendreceive(sess_data);
1114 if (rc)
1115 goto out;
1116
1117 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1118 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1119
1120 if (smb_buf->WordCount != 3) {
1121 rc = -EIO;
1122 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1123 goto out;
1124 }
1125
1126 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1127 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1128
1129 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1130 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1131
1132 bytes_remaining = get_bcc(smb_buf);
1133 bcc_ptr = pByteArea(smb_buf);
1134
1135 /* BB check if Unicode and decode strings */
1136 if (bytes_remaining == 0) {
1137 /* no string area to decode, do nothing */
1138 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1139 /* unicode string area must be word-aligned */
1140 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1141 ++bcc_ptr;
1142 --bytes_remaining;
1143 }
1144 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1145 sess_data->nls_cp);
1146 } else {
1147 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1148 sess_data->nls_cp);
1149 }
1150
1151 rc = sess_establish_session(sess_data);
1152 out:
1153 sess_data->result = rc;
1154 sess_data->func = NULL;
1155 sess_free_buffer(sess_data);
1156 kfree(ses->auth_key.response);
1157 ses->auth_key.response = NULL;
1158 }
1159
1160 static void
1161 sess_auth_ntlmv2(struct sess_data *sess_data)
1162 {
1163 int rc = 0;
1164 struct smb_hdr *smb_buf;
1165 SESSION_SETUP_ANDX *pSMB;
1166 char *bcc_ptr;
1167 struct cifs_ses *ses = sess_data->ses;
1168 __u32 capabilities;
1169 __u16 bytes_remaining;
1170
1171 /* old style NTLM sessionsetup */
1172 /* wct = 13 */
1173 rc = sess_alloc_buffer(sess_data, 13);
1174 if (rc)
1175 goto out;
1176
1177 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1178 bcc_ptr = sess_data->iov[2].iov_base;
1179 capabilities = cifs_ssetup_hdr(ses, pSMB);
1180
1181 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
1182
1183 /* LM2 password would be here if we supported it */
1184 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
1185
1186 if (ses->user_name != NULL) {
1187 /* calculate nlmv2 response and session key */
1188 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
1189 if (rc) {
1190 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
1191 goto out;
1192 }
1193
1194 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1195 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1196 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1197
1198 /* set case sensitive password length after tilen may get
1199 * assigned, tilen is 0 otherwise.
1200 */
1201 pSMB->req_no_secext.CaseSensitivePasswordLength =
1202 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1203 } else {
1204 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
1205 }
1206
1207 if (ses->capabilities & CAP_UNICODE) {
1208 if (sess_data->iov[0].iov_len % 2) {
1209 *bcc_ptr = 0;
1210 bcc_ptr++;
1211 }
1212 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1213 } else {
1214 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1215 }
1216
1217
1218 sess_data->iov[2].iov_len = (long) bcc_ptr -
1219 (long) sess_data->iov[2].iov_base;
1220
1221 rc = sess_sendreceive(sess_data);
1222 if (rc)
1223 goto out;
1224
1225 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1226 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1227
1228 if (smb_buf->WordCount != 3) {
1229 rc = -EIO;
1230 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1231 goto out;
1232 }
1233
1234 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1235 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1236
1237 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1238 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1239
1240 bytes_remaining = get_bcc(smb_buf);
1241 bcc_ptr = pByteArea(smb_buf);
1242
1243 /* BB check if Unicode and decode strings */
1244 if (bytes_remaining == 0) {
1245 /* no string area to decode, do nothing */
1246 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1247 /* unicode string area must be word-aligned */
1248 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1249 ++bcc_ptr;
1250 --bytes_remaining;
1251 }
1252 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1253 sess_data->nls_cp);
1254 } else {
1255 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1256 sess_data->nls_cp);
1257 }
1258
1259 rc = sess_establish_session(sess_data);
1260 out:
1261 sess_data->result = rc;
1262 sess_data->func = NULL;
1263 sess_free_buffer(sess_data);
1264 kfree(ses->auth_key.response);
1265 ses->auth_key.response = NULL;
1266 }
1267
1268 #ifdef CONFIG_CIFS_UPCALL
1269 static void
1270 sess_auth_kerberos(struct sess_data *sess_data)
1271 {
1272 int rc = 0;
1273 struct smb_hdr *smb_buf;
1274 SESSION_SETUP_ANDX *pSMB;
1275 char *bcc_ptr;
1276 struct cifs_ses *ses = sess_data->ses;
1277 __u32 capabilities;
1278 __u16 bytes_remaining;
1279 struct key *spnego_key = NULL;
1280 struct cifs_spnego_msg *msg;
1281 u16 blob_len;
1282
1283 /* extended security */
1284 /* wct = 12 */
1285 rc = sess_alloc_buffer(sess_data, 12);
1286 if (rc)
1287 goto out;
1288
1289 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1290 bcc_ptr = sess_data->iov[2].iov_base;
1291 capabilities = cifs_ssetup_hdr(ses, pSMB);
1292
1293 spnego_key = cifs_get_spnego_key(ses);
1294 if (IS_ERR(spnego_key)) {
1295 rc = PTR_ERR(spnego_key);
1296 spnego_key = NULL;
1297 goto out;
1298 }
1299
1300 msg = spnego_key->payload.data[0];
1301 /*
1302 * check version field to make sure that cifs.upcall is
1303 * sending us a response in an expected form
1304 */
1305 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1306 cifs_dbg(VFS,
1307 "incorrect version of cifs.upcall (expected %d but got %d)",
1308 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1309 rc = -EKEYREJECTED;
1310 goto out_put_spnego_key;
1311 }
1312
1313 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1314 GFP_KERNEL);
1315 if (!ses->auth_key.response) {
1316 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory",
1317 msg->sesskey_len);
1318 rc = -ENOMEM;
1319 goto out_put_spnego_key;
1320 }
1321 ses->auth_key.len = msg->sesskey_len;
1322
1323 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1324 capabilities |= CAP_EXTENDED_SECURITY;
1325 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1326 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1327 sess_data->iov[1].iov_len = msg->secblob_len;
1328 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1329
1330 if (ses->capabilities & CAP_UNICODE) {
1331 /* unicode strings must be word aligned */
1332 if ((sess_data->iov[0].iov_len
1333 + sess_data->iov[1].iov_len) % 2) {
1334 *bcc_ptr = 0;
1335 bcc_ptr++;
1336 }
1337 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1338 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1339 } else {
1340 /* BB: is this right? */
1341 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1342 }
1343
1344 sess_data->iov[2].iov_len = (long) bcc_ptr -
1345 (long) sess_data->iov[2].iov_base;
1346
1347 rc = sess_sendreceive(sess_data);
1348 if (rc)
1349 goto out_put_spnego_key;
1350
1351 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1352 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1353
1354 if (smb_buf->WordCount != 4) {
1355 rc = -EIO;
1356 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1357 goto out_put_spnego_key;
1358 }
1359
1360 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1361 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1362
1363 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1364 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1365
1366 bytes_remaining = get_bcc(smb_buf);
1367 bcc_ptr = pByteArea(smb_buf);
1368
1369 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1370 if (blob_len > bytes_remaining) {
1371 cifs_dbg(VFS, "bad security blob length %d\n",
1372 blob_len);
1373 rc = -EINVAL;
1374 goto out_put_spnego_key;
1375 }
1376 bcc_ptr += blob_len;
1377 bytes_remaining -= blob_len;
1378
1379 /* BB check if Unicode and decode strings */
1380 if (bytes_remaining == 0) {
1381 /* no string area to decode, do nothing */
1382 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1383 /* unicode string area must be word-aligned */
1384 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1385 ++bcc_ptr;
1386 --bytes_remaining;
1387 }
1388 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1389 sess_data->nls_cp);
1390 } else {
1391 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1392 sess_data->nls_cp);
1393 }
1394
1395 rc = sess_establish_session(sess_data);
1396 out_put_spnego_key:
1397 key_invalidate(spnego_key);
1398 key_put(spnego_key);
1399 out:
1400 sess_data->result = rc;
1401 sess_data->func = NULL;
1402 sess_free_buffer(sess_data);
1403 kfree(ses->auth_key.response);
1404 ses->auth_key.response = NULL;
1405 }
1406
1407 #endif /* ! CONFIG_CIFS_UPCALL */
1408
1409 /*
1410 * The required kvec buffers have to be allocated before calling this
1411 * function.
1412 */
1413 static int
1414 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1415 {
1416 SESSION_SETUP_ANDX *pSMB;
1417 struct cifs_ses *ses = sess_data->ses;
1418 __u32 capabilities;
1419 char *bcc_ptr;
1420
1421 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1422
1423 capabilities = cifs_ssetup_hdr(ses, pSMB);
1424 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1425 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1426 return -ENOSYS;
1427 }
1428
1429 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1430 capabilities |= CAP_EXTENDED_SECURITY;
1431 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1432
1433 bcc_ptr = sess_data->iov[2].iov_base;
1434 /* unicode strings must be word aligned */
1435 if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1436 *bcc_ptr = 0;
1437 bcc_ptr++;
1438 }
1439 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1440
1441 sess_data->iov[2].iov_len = (long) bcc_ptr -
1442 (long) sess_data->iov[2].iov_base;
1443
1444 return 0;
1445 }
1446
1447 static void
1448 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1449
1450 static void
1451 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1452 {
1453 int rc;
1454 struct smb_hdr *smb_buf;
1455 SESSION_SETUP_ANDX *pSMB;
1456 struct cifs_ses *ses = sess_data->ses;
1457 __u16 bytes_remaining;
1458 char *bcc_ptr;
1459 u16 blob_len;
1460
1461 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1462
1463 /*
1464 * if memory allocation is successful, caller of this function
1465 * frees it.
1466 */
1467 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1468 if (!ses->ntlmssp) {
1469 rc = -ENOMEM;
1470 goto out;
1471 }
1472 ses->ntlmssp->sesskey_per_smbsess = false;
1473
1474 /* wct = 12 */
1475 rc = sess_alloc_buffer(sess_data, 12);
1476 if (rc)
1477 goto out;
1478
1479 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1480
1481 /* Build security blob before we assemble the request */
1482 build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
1483 sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
1484 sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
1485 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
1486
1487 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1488 if (rc)
1489 goto out;
1490
1491 rc = sess_sendreceive(sess_data);
1492
1493 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1494 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1495
1496 /* If true, rc here is expected and not an error */
1497 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1498 smb_buf->Status.CifsError ==
1499 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1500 rc = 0;
1501
1502 if (rc)
1503 goto out;
1504
1505 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1506
1507 if (smb_buf->WordCount != 4) {
1508 rc = -EIO;
1509 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1510 goto out;
1511 }
1512
1513 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1514 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1515
1516 bytes_remaining = get_bcc(smb_buf);
1517 bcc_ptr = pByteArea(smb_buf);
1518
1519 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1520 if (blob_len > bytes_remaining) {
1521 cifs_dbg(VFS, "bad security blob length %d\n",
1522 blob_len);
1523 rc = -EINVAL;
1524 goto out;
1525 }
1526
1527 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1528 out:
1529 sess_free_buffer(sess_data);
1530
1531 if (!rc) {
1532 sess_data->func = sess_auth_rawntlmssp_authenticate;
1533 return;
1534 }
1535
1536 /* Else error. Cleanup */
1537 kfree(ses->auth_key.response);
1538 ses->auth_key.response = NULL;
1539 kfree(ses->ntlmssp);
1540 ses->ntlmssp = NULL;
1541
1542 sess_data->func = NULL;
1543 sess_data->result = rc;
1544 }
1545
1546 static void
1547 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1548 {
1549 int rc;
1550 struct smb_hdr *smb_buf;
1551 SESSION_SETUP_ANDX *pSMB;
1552 struct cifs_ses *ses = sess_data->ses;
1553 __u16 bytes_remaining;
1554 char *bcc_ptr;
1555 unsigned char *ntlmsspblob = NULL;
1556 u16 blob_len;
1557
1558 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1559
1560 /* wct = 12 */
1561 rc = sess_alloc_buffer(sess_data, 12);
1562 if (rc)
1563 goto out;
1564
1565 /* Build security blob before we assemble the request */
1566 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1567 smb_buf = (struct smb_hdr *)pSMB;
1568 rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1569 &blob_len, ses, sess_data->nls_cp);
1570 if (rc)
1571 goto out_free_ntlmsspblob;
1572 sess_data->iov[1].iov_len = blob_len;
1573 sess_data->iov[1].iov_base = ntlmsspblob;
1574 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1575 /*
1576 * Make sure that we tell the server that we are using
1577 * the uid that it just gave us back on the response
1578 * (challenge)
1579 */
1580 smb_buf->Uid = ses->Suid;
1581
1582 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1583 if (rc)
1584 goto out_free_ntlmsspblob;
1585
1586 rc = sess_sendreceive(sess_data);
1587 if (rc)
1588 goto out_free_ntlmsspblob;
1589
1590 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1591 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1592 if (smb_buf->WordCount != 4) {
1593 rc = -EIO;
1594 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1595 goto out_free_ntlmsspblob;
1596 }
1597
1598 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1599 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1600
1601 if (ses->Suid != smb_buf->Uid) {
1602 ses->Suid = smb_buf->Uid;
1603 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1604 }
1605
1606 bytes_remaining = get_bcc(smb_buf);
1607 bcc_ptr = pByteArea(smb_buf);
1608 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1609 if (blob_len > bytes_remaining) {
1610 cifs_dbg(VFS, "bad security blob length %d\n",
1611 blob_len);
1612 rc = -EINVAL;
1613 goto out_free_ntlmsspblob;
1614 }
1615 bcc_ptr += blob_len;
1616 bytes_remaining -= blob_len;
1617
1618
1619 /* BB check if Unicode and decode strings */
1620 if (bytes_remaining == 0) {
1621 /* no string area to decode, do nothing */
1622 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1623 /* unicode string area must be word-aligned */
1624 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1625 ++bcc_ptr;
1626 --bytes_remaining;
1627 }
1628 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1629 sess_data->nls_cp);
1630 } else {
1631 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1632 sess_data->nls_cp);
1633 }
1634
1635 out_free_ntlmsspblob:
1636 kfree(ntlmsspblob);
1637 out:
1638 sess_free_buffer(sess_data);
1639
1640 if (!rc)
1641 rc = sess_establish_session(sess_data);
1642
1643 /* Cleanup */
1644 kfree(ses->auth_key.response);
1645 ses->auth_key.response = NULL;
1646 kfree(ses->ntlmssp);
1647 ses->ntlmssp = NULL;
1648
1649 sess_data->func = NULL;
1650 sess_data->result = rc;
1651 }
1652
1653 static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
1654 {
1655 int type;
1656
1657 type = cifs_select_sectype(ses->server, ses->sectype);
1658 cifs_dbg(FYI, "sess setup type %d\n", type);
1659 if (type == Unspecified) {
1660 cifs_dbg(VFS,
1661 "Unable to select appropriate authentication method!");
1662 return -EINVAL;
1663 }
1664
1665 switch (type) {
1666 case LANMAN:
1667 /* LANMAN and plaintext are less secure and off by default.
1668 * So we make this explicitly be turned on in kconfig (in the
1669 * build) and turned on at runtime (changed from the default)
1670 * in proc/fs/cifs or via mount parm. Unfortunately this is
1671 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
1672 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1673 sess_data->func = sess_auth_lanman;
1674 break;
1675 #else
1676 return -EOPNOTSUPP;
1677 #endif
1678 case NTLM:
1679 sess_data->func = sess_auth_ntlm;
1680 break;
1681 case NTLMv2:
1682 sess_data->func = sess_auth_ntlmv2;
1683 break;
1684 case Kerberos:
1685 #ifdef CONFIG_CIFS_UPCALL
1686 sess_data->func = sess_auth_kerberos;
1687 break;
1688 #else
1689 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1690 return -ENOSYS;
1691 break;
1692 #endif /* CONFIG_CIFS_UPCALL */
1693 case RawNTLMSSP:
1694 sess_data->func = sess_auth_rawntlmssp_negotiate;
1695 break;
1696 default:
1697 cifs_dbg(VFS, "secType %d not supported!\n", type);
1698 return -ENOSYS;
1699 }
1700
1701 return 0;
1702 }
1703
1704 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1705 const struct nls_table *nls_cp)
1706 {
1707 int rc = 0;
1708 struct sess_data *sess_data;
1709
1710 if (ses == NULL) {
1711 WARN(1, "%s: ses == NULL!", __func__);
1712 return -EINVAL;
1713 }
1714
1715 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1716 if (!sess_data)
1717 return -ENOMEM;
1718
1719 rc = select_sec(ses, sess_data);
1720 if (rc)
1721 goto out;
1722
1723 sess_data->xid = xid;
1724 sess_data->ses = ses;
1725 sess_data->buf0_type = CIFS_NO_BUFFER;
1726 sess_data->nls_cp = (struct nls_table *) nls_cp;
1727
1728 while (sess_data->func)
1729 sess_data->func(sess_data);
1730
1731 /* Store result before we free sess_data */
1732 rc = sess_data->result;
1733
1734 out:
1735 kfree(sess_data);
1736 return rc;
1737 }
Linux with added FPC-III support