1 // SPDX-License-Identifier: LGPL-2.1
2 /*
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 */
10
11 #include "cifspdu.h"
12 #include "cifsglob.h"
13 #include "cifsproto.h"
14 #include "cifs_unicode.h"
15 #include "cifs_debug.h"
16 #include "ntlmssp.h"
17 #include "nterr.h"
18 #include <linux/utsname.h>
19 #include <linux/slab.h>
20 #include <linux/version.h>
21 #include "cifsfs.h"
22 #include "cifs_spnego.h"
23 #include "smb2proto.h"
24 #include "fs_context.h"
25
26 static int
27 cifs_ses_add_channel(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
28 struct cifs_server_iface *iface);
29
30 bool
is_server_using_iface(struct TCP_Server_Info * server,struct cifs_server_iface * iface)31 is_server_using_iface(struct TCP_Server_Info *server,
32 struct cifs_server_iface *iface)
33 {
34 struct sockaddr_in *i4 = (struct sockaddr_in *)&iface->sockaddr;
35 struct sockaddr_in6 *i6 = (struct sockaddr_in6 *)&iface->sockaddr;
36 struct sockaddr_in *s4 = (struct sockaddr_in *)&server->dstaddr;
37 struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)&server->dstaddr;
38
39 if (server->dstaddr.ss_family != iface->sockaddr.ss_family)
40 return false;
41 if (server->dstaddr.ss_family == AF_INET) {
42 if (s4->sin_addr.s_addr != i4->sin_addr.s_addr)
43 return false;
44 } else if (server->dstaddr.ss_family == AF_INET6) {
45 if (memcmp(&s6->sin6_addr, &i6->sin6_addr,
46 sizeof(i6->sin6_addr)) != 0)
47 return false;
48 } else {
49 /* unknown family.. */
50 return false;
51 }
52 return true;
53 }
54
is_ses_using_iface(struct cifs_ses * ses,struct cifs_server_iface * iface)55 bool is_ses_using_iface(struct cifs_ses *ses, struct cifs_server_iface *iface)
56 {
57 int i;
58
59 spin_lock(&ses->chan_lock);
60 for (i = 0; i < ses->chan_count; i++) {
61 if (ses->chans[i].iface == iface) {
62 spin_unlock(&ses->chan_lock);
63 return true;
64 }
65 }
66 spin_unlock(&ses->chan_lock);
67 return false;
68 }
69
70 /* channel helper functions. assumed that chan_lock is held by caller. */
71
72 unsigned int
cifs_ses_get_chan_index(struct cifs_ses * ses,struct TCP_Server_Info * server)73 cifs_ses_get_chan_index(struct cifs_ses *ses,
74 struct TCP_Server_Info *server)
75 {
76 unsigned int i;
77
78 for (i = 0; i < ses->chan_count; i++) {
79 if (ses->chans[i].server == server)
80 return i;
81 }
82
83 /* If we didn't find the channel, it is likely a bug */
84 if (server)
85 cifs_dbg(VFS, "unable to get chan index for server: 0x%llx",
86 server->conn_id);
87 WARN_ON(1);
88 return 0;
89 }
90
91 void
cifs_chan_set_in_reconnect(struct cifs_ses * ses,struct TCP_Server_Info * server)92 cifs_chan_set_in_reconnect(struct cifs_ses *ses,
93 struct TCP_Server_Info *server)
94 {
95 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
96
97 ses->chans[chan_index].in_reconnect = true;
98 }
99
100 void
cifs_chan_clear_in_reconnect(struct cifs_ses * ses,struct TCP_Server_Info * server)101 cifs_chan_clear_in_reconnect(struct cifs_ses *ses,
102 struct TCP_Server_Info *server)
103 {
104 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
105
106 ses->chans[chan_index].in_reconnect = false;
107 }
108
109 bool
cifs_chan_in_reconnect(struct cifs_ses * ses,struct TCP_Server_Info * server)110 cifs_chan_in_reconnect(struct cifs_ses *ses,
111 struct TCP_Server_Info *server)
112 {
113 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
114
115 return CIFS_CHAN_IN_RECONNECT(ses, chan_index);
116 }
117
118 void
cifs_chan_set_need_reconnect(struct cifs_ses * ses,struct TCP_Server_Info * server)119 cifs_chan_set_need_reconnect(struct cifs_ses *ses,
120 struct TCP_Server_Info *server)
121 {
122 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
123
124 set_bit(chan_index, &ses->chans_need_reconnect);
125 cifs_dbg(FYI, "Set reconnect bitmask for chan %u; now 0x%lx\n",
126 chan_index, ses->chans_need_reconnect);
127 }
128
129 void
cifs_chan_clear_need_reconnect(struct cifs_ses * ses,struct TCP_Server_Info * server)130 cifs_chan_clear_need_reconnect(struct cifs_ses *ses,
131 struct TCP_Server_Info *server)
132 {
133 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
134
135 clear_bit(chan_index, &ses->chans_need_reconnect);
136 cifs_dbg(FYI, "Cleared reconnect bitmask for chan %u; now 0x%lx\n",
137 chan_index, ses->chans_need_reconnect);
138 }
139
140 bool
cifs_chan_needs_reconnect(struct cifs_ses * ses,struct TCP_Server_Info * server)141 cifs_chan_needs_reconnect(struct cifs_ses *ses,
142 struct TCP_Server_Info *server)
143 {
144 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
145
146 return CIFS_CHAN_NEEDS_RECONNECT(ses, chan_index);
147 }
148
149 bool
cifs_chan_is_iface_active(struct cifs_ses * ses,struct TCP_Server_Info * server)150 cifs_chan_is_iface_active(struct cifs_ses *ses,
151 struct TCP_Server_Info *server)
152 {
153 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
154
155 return ses->chans[chan_index].iface &&
156 ses->chans[chan_index].iface->is_active;
157 }
158
159 /* returns number of channels added */
cifs_try_adding_channels(struct cifs_sb_info * cifs_sb,struct cifs_ses * ses)160 int cifs_try_adding_channels(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses)
161 {
162 struct TCP_Server_Info *server = ses->server;
163 int old_chan_count, new_chan_count;
164 int left;
165 int rc = 0;
166 int tries = 0;
167 struct cifs_server_iface *iface = NULL, *niface = NULL;
168
169 spin_lock(&ses->chan_lock);
170
171 new_chan_count = old_chan_count = ses->chan_count;
172 left = ses->chan_max - ses->chan_count;
173
174 if (left <= 0) {
175 spin_unlock(&ses->chan_lock);
176 cifs_dbg(FYI,
177 "ses already at max_channels (%zu), nothing to open\n",
178 ses->chan_max);
179 return 0;
180 }
181
182 if (server->dialect < SMB30_PROT_ID) {
183 spin_unlock(&ses->chan_lock);
184 cifs_dbg(VFS, "multichannel is not supported on this protocol version, use 3.0 or above\n");
185 return 0;
186 }
187
188 if (!(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
189 ses->chan_max = 1;
190 spin_unlock(&ses->chan_lock);
191 cifs_server_dbg(VFS, "no multichannel support\n");
192 return 0;
193 }
194 spin_unlock(&ses->chan_lock);
195
196 /*
197 * Keep connecting to same, fastest, iface for all channels as
198 * long as its RSS. Try next fastest one if not RSS or channel
199 * creation fails.
200 */
201 spin_lock(&ses->iface_lock);
202 iface = list_first_entry(&ses->iface_list, struct cifs_server_iface,
203 iface_head);
204 spin_unlock(&ses->iface_lock);
205
206 while (left > 0) {
207
208 tries++;
209 if (tries > 3*ses->chan_max) {
210 cifs_dbg(FYI, "too many channel open attempts (%d channels left to open)\n",
211 left);
212 break;
213 }
214
215 spin_lock(&ses->iface_lock);
216 if (!ses->iface_count) {
217 spin_unlock(&ses->iface_lock);
218 break;
219 }
220
221 list_for_each_entry_safe_from(iface, niface, &ses->iface_list,
222 iface_head) {
223 /* skip ifaces that are unusable */
224 if (!iface->is_active ||
225 (is_ses_using_iface(ses, iface) &&
226 !iface->rss_capable)) {
227 continue;
228 }
229
230 /* take ref before unlock */
231 kref_get(&iface->refcount);
232
233 spin_unlock(&ses->iface_lock);
234 rc = cifs_ses_add_channel(cifs_sb, ses, iface);
235 spin_lock(&ses->iface_lock);
236
237 if (rc) {
238 cifs_dbg(VFS, "failed to open extra channel on iface:%pIS rc=%d\n",
239 &iface->sockaddr,
240 rc);
241 kref_put(&iface->refcount, release_iface);
242 continue;
243 }
244
245 cifs_dbg(FYI, "successfully opened new channel on iface:%pIS\n",
246 &iface->sockaddr);
247 break;
248 }
249 spin_unlock(&ses->iface_lock);
250
251 left--;
252 new_chan_count++;
253 }
254
255 return new_chan_count - old_chan_count;
256 }
257
258 /*
259 * update the iface for the channel if necessary.
260 * will return 0 when iface is updated, 1 if removed, 2 otherwise
261 * Must be called with chan_lock held.
262 */
263 int
cifs_chan_update_iface(struct cifs_ses * ses,struct TCP_Server_Info * server)264 cifs_chan_update_iface(struct cifs_ses *ses, struct TCP_Server_Info *server)
265 {
266 unsigned int chan_index;
267 struct cifs_server_iface *iface = NULL;
268 struct cifs_server_iface *old_iface = NULL;
269 int rc = 0;
270
271 spin_lock(&ses->chan_lock);
272 chan_index = cifs_ses_get_chan_index(ses, server);
273 if (!chan_index) {
274 spin_unlock(&ses->chan_lock);
275 return 0;
276 }
277
278 if (ses->chans[chan_index].iface) {
279 old_iface = ses->chans[chan_index].iface;
280 if (old_iface->is_active) {
281 spin_unlock(&ses->chan_lock);
282 return 1;
283 }
284 }
285 spin_unlock(&ses->chan_lock);
286
287 spin_lock(&ses->iface_lock);
288 /* then look for a new one */
289 list_for_each_entry(iface, &ses->iface_list, iface_head) {
290 if (!iface->is_active ||
291 (is_ses_using_iface(ses, iface) &&
292 !iface->rss_capable)) {
293 continue;
294 }
295 kref_get(&iface->refcount);
296 break;
297 }
298
299 if (list_entry_is_head(iface, &ses->iface_list, iface_head)) {
300 rc = 1;
301 iface = NULL;
302 cifs_dbg(FYI, "unable to find a suitable iface\n");
303 }
304
305 /* now drop the ref to the current iface */
306 if (old_iface && iface) {
307 cifs_dbg(FYI, "replacing iface: %pIS with %pIS\n",
308 &old_iface->sockaddr,
309 &iface->sockaddr);
310 kref_put(&old_iface->refcount, release_iface);
311 } else if (old_iface) {
312 cifs_dbg(FYI, "releasing ref to iface: %pIS\n",
313 &old_iface->sockaddr);
314 kref_put(&old_iface->refcount, release_iface);
315 } else {
316 WARN_ON(!iface);
317 cifs_dbg(FYI, "adding new iface: %pIS\n", &iface->sockaddr);
318 }
319 spin_unlock(&ses->iface_lock);
320
321 spin_lock(&ses->chan_lock);
322 chan_index = cifs_ses_get_chan_index(ses, server);
323 ses->chans[chan_index].iface = iface;
324
325 /* No iface is found. if secondary chan, drop connection */
326 if (!iface && SERVER_IS_CHAN(server))
327 ses->chans[chan_index].server = NULL;
328
329 spin_unlock(&ses->chan_lock);
330
331 if (!iface && SERVER_IS_CHAN(server))
332 cifs_put_tcp_session(server, false);
333
334 return rc;
335 }
336
337 /*
338 * If server is a channel of ses, return the corresponding enclosing
339 * cifs_chan otherwise return NULL.
340 */
341 struct cifs_chan *
cifs_ses_find_chan(struct cifs_ses * ses,struct TCP_Server_Info * server)342 cifs_ses_find_chan(struct cifs_ses *ses, struct TCP_Server_Info *server)
343 {
344 int i;
345
346 spin_lock(&ses->chan_lock);
347 for (i = 0; i < ses->chan_count; i++) {
348 if (ses->chans[i].server == server) {
349 spin_unlock(&ses->chan_lock);
350 return &ses->chans[i];
351 }
352 }
353 spin_unlock(&ses->chan_lock);
354 return NULL;
355 }
356
357 static int
cifs_ses_add_channel(struct cifs_sb_info * cifs_sb,struct cifs_ses * ses,struct cifs_server_iface * iface)358 cifs_ses_add_channel(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
359 struct cifs_server_iface *iface)
360 {
361 struct TCP_Server_Info *chan_server;
362 struct cifs_chan *chan;
363 struct smb3_fs_context *ctx;
364 static const char unc_fmt[] = "\\%s\\foo";
365 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;
366 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;
367 size_t len;
368 int rc;
369 unsigned int xid = get_xid();
370
371 if (iface->sockaddr.ss_family == AF_INET)
372 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI4)\n",
373 ses, iface->speed, iface->rdma_capable ? "yes" : "no",
374 &ipv4->sin_addr);
375 else
376 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI6)\n",
377 ses, iface->speed, iface->rdma_capable ? "yes" : "no",
378 &ipv6->sin6_addr);
379
380 /*
381 * Setup a ctx with mostly the same info as the existing
382 * session and overwrite it with the requested iface data.
383 *
384 * We need to setup at least the fields used for negprot and
385 * sesssetup.
386 *
387 * We only need the ctx here, so we can reuse memory from
388 * the session and server without caring about memory
389 * management.
390 */
391 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
392 if (!ctx) {
393 rc = -ENOMEM;
394 goto out_free_xid;
395 }
396
397 /* Always make new connection for now (TODO?) */
398 ctx->nosharesock = true;
399
400 /* Auth */
401 ctx->domainauto = ses->domainAuto;
402 ctx->domainname = ses->domainName;
403
404 /* no hostname for extra channels */
405 ctx->server_hostname = "";
406
407 ctx->username = ses->user_name;
408 ctx->password = ses->password;
409 ctx->sectype = ses->sectype;
410 ctx->sign = ses->sign;
411
412 /* UNC and paths */
413 /* XXX: Use ses->server->hostname? */
414 len = sizeof(unc_fmt) + SERVER_NAME_LEN_WITH_NULL;
415 ctx->UNC = kzalloc(len, GFP_KERNEL);
416 if (!ctx->UNC) {
417 rc = -ENOMEM;
418 goto out_free_ctx;
419 }
420 scnprintf(ctx->UNC, len, unc_fmt, ses->ip_addr);
421 ctx->prepath = "";
422
423 /* Reuse same version as master connection */
424 ctx->vals = ses->server->vals;
425 ctx->ops = ses->server->ops;
426
427 ctx->noblocksnd = ses->server->noblocksnd;
428 ctx->noautotune = ses->server->noautotune;
429 ctx->sockopt_tcp_nodelay = ses->server->tcp_nodelay;
430 ctx->echo_interval = ses->server->echo_interval / HZ;
431 ctx->max_credits = ses->server->max_credits;
432
433 /*
434 * This will be used for encoding/decoding user/domain/pw
435 * during sess setup auth.
436 */
437 ctx->local_nls = cifs_sb->local_nls;
438
439 /* Use RDMA if possible */
440 ctx->rdma = iface->rdma_capable;
441 memcpy(&ctx->dstaddr, &iface->sockaddr, sizeof(ctx->dstaddr));
442
443 /* reuse master con client guid */
444 memcpy(&ctx->client_guid, ses->server->client_guid,
445 sizeof(ctx->client_guid));
446 ctx->use_client_guid = true;
447
448 chan_server = cifs_get_tcp_session(ctx, ses->server);
449
450 spin_lock(&ses->chan_lock);
451 chan = &ses->chans[ses->chan_count];
452 chan->server = chan_server;
453 if (IS_ERR(chan->server)) {
454 rc = PTR_ERR(chan->server);
455 chan->server = NULL;
456 spin_unlock(&ses->chan_lock);
457 goto out;
458 }
459 chan->iface = iface;
460 ses->chan_count++;
461 atomic_set(&ses->chan_seq, 0);
462
463 /* Mark this channel as needing connect/setup */
464 cifs_chan_set_need_reconnect(ses, chan->server);
465
466 spin_unlock(&ses->chan_lock);
467
468 mutex_lock(&ses->session_mutex);
469 /*
470 * We need to allocate the server crypto now as we will need
471 * to sign packets before we generate the channel signing key
472 * (we sign with the session key)
473 */
474 rc = smb311_crypto_shash_allocate(chan->server);
475 if (rc) {
476 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
477 mutex_unlock(&ses->session_mutex);
478 goto out;
479 }
480
481 rc = cifs_negotiate_protocol(xid, ses, chan->server);
482 if (!rc)
483 rc = cifs_setup_session(xid, ses, chan->server, cifs_sb->local_nls);
484
485 mutex_unlock(&ses->session_mutex);
486
487 out:
488 if (rc && chan->server) {
489 /*
490 * we should avoid race with these delayed works before we
491 * remove this channel
492 */
493 cancel_delayed_work_sync(&chan->server->echo);
494 cancel_delayed_work_sync(&chan->server->reconnect);
495
496 spin_lock(&ses->chan_lock);
497 /* we rely on all bits beyond chan_count to be clear */
498 cifs_chan_clear_need_reconnect(ses, chan->server);
499 ses->chan_count--;
500 /*
501 * chan_count should never reach 0 as at least the primary
502 * channel is always allocated
503 */
504 WARN_ON(ses->chan_count < 1);
505 spin_unlock(&ses->chan_lock);
506
507 cifs_put_tcp_session(chan->server, 0);
508 }
509
510 kfree(ctx->UNC);
511 out_free_ctx:
512 kfree(ctx);
513 out_free_xid:
514 free_xid(xid);
515 return rc;
516 }
517
518 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
cifs_ssetup_hdr(struct cifs_ses * ses,struct TCP_Server_Info * server,SESSION_SETUP_ANDX * pSMB)519 static __u32 cifs_ssetup_hdr(struct cifs_ses *ses,
520 struct TCP_Server_Info *server,
521 SESSION_SETUP_ANDX *pSMB)
522 {
523 __u32 capabilities = 0;
524
525 /* init fields common to all four types of SessSetup */
526 /* Note that offsets for first seven fields in req struct are same */
527 /* in CIFS Specs so does not matter which of 3 forms of struct */
528 /* that we use in next few lines */
529 /* Note that header is initialized to zero in header_assemble */
530 pSMB->req.AndXCommand = 0xFF;
531 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
532 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
533 USHRT_MAX));
534 pSMB->req.MaxMpxCount = cpu_to_le16(server->maxReq);
535 pSMB->req.VcNumber = cpu_to_le16(1);
536
537 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
538
539 /* BB verify whether signing required on neg or just on auth frame
540 (and NTLM case) */
541
542 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
543 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
544
545 if (server->sign)
546 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
547
548 if (ses->capabilities & CAP_UNICODE) {
549 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
550 capabilities |= CAP_UNICODE;
551 }
552 if (ses->capabilities & CAP_STATUS32) {
553 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
554 capabilities |= CAP_STATUS32;
555 }
556 if (ses->capabilities & CAP_DFS) {
557 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
558 capabilities |= CAP_DFS;
559 }
560 if (ses->capabilities & CAP_UNIX)
561 capabilities |= CAP_UNIX;
562
563 return capabilities;
564 }
565
566 static void
unicode_oslm_strings(char ** pbcc_area,const struct nls_table * nls_cp)567 unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
568 {
569 char *bcc_ptr = *pbcc_area;
570 int bytes_ret = 0;
571
572 /* Copy OS version */
573 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
574 nls_cp);
575 bcc_ptr += 2 * bytes_ret;
576 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
577 32, nls_cp);
578 bcc_ptr += 2 * bytes_ret;
579 bcc_ptr += 2; /* trailing null */
580
581 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
582 32, nls_cp);
583 bcc_ptr += 2 * bytes_ret;
584 bcc_ptr += 2; /* trailing null */
585
586 *pbcc_area = bcc_ptr;
587 }
588
unicode_domain_string(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)589 static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
590 const struct nls_table *nls_cp)
591 {
592 char *bcc_ptr = *pbcc_area;
593 int bytes_ret = 0;
594
595 /* copy domain */
596 if (ses->domainName == NULL) {
597 /* Sending null domain better than using a bogus domain name (as
598 we did briefly in 2.6.18) since server will use its default */
599 *bcc_ptr = 0;
600 *(bcc_ptr+1) = 0;
601 bytes_ret = 0;
602 } else
603 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
604 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
605 bcc_ptr += 2 * bytes_ret;
606 bcc_ptr += 2; /* account for null terminator */
607
608 *pbcc_area = bcc_ptr;
609 }
610
unicode_ssetup_strings(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)611 static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
612 const struct nls_table *nls_cp)
613 {
614 char *bcc_ptr = *pbcc_area;
615 int bytes_ret = 0;
616
617 /* BB FIXME add check that strings total less
618 than 335 or will need to send them as arrays */
619
620 /* copy user */
621 if (ses->user_name == NULL) {
622 /* null user mount */
623 *bcc_ptr = 0;
624 *(bcc_ptr+1) = 0;
625 } else {
626 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
627 CIFS_MAX_USERNAME_LEN, nls_cp);
628 }
629 bcc_ptr += 2 * bytes_ret;
630 bcc_ptr += 2; /* account for null termination */
631
632 unicode_domain_string(&bcc_ptr, ses, nls_cp);
633 unicode_oslm_strings(&bcc_ptr, nls_cp);
634
635 *pbcc_area = bcc_ptr;
636 }
637
ascii_ssetup_strings(char ** pbcc_area,struct cifs_ses * ses,const struct nls_table * nls_cp)638 static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
639 const struct nls_table *nls_cp)
640 {
641 char *bcc_ptr = *pbcc_area;
642 int len;
643
644 /* copy user */
645 /* BB what about null user mounts - check that we do this BB */
646 /* copy user */
647 if (ses->user_name != NULL) {
648 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
649 if (WARN_ON_ONCE(len < 0))
650 len = CIFS_MAX_USERNAME_LEN - 1;
651 bcc_ptr += len;
652 }
653 /* else null user mount */
654 *bcc_ptr = 0;
655 bcc_ptr++; /* account for null termination */
656
657 /* copy domain */
658 if (ses->domainName != NULL) {
659 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
660 if (WARN_ON_ONCE(len < 0))
661 len = CIFS_MAX_DOMAINNAME_LEN - 1;
662 bcc_ptr += len;
663 } /* else we will send a null domain name
664 so the server will default to its own domain */
665 *bcc_ptr = 0;
666 bcc_ptr++;
667
668 /* BB check for overflow here */
669
670 strcpy(bcc_ptr, "Linux version ");
671 bcc_ptr += strlen("Linux version ");
672 strcpy(bcc_ptr, init_utsname()->release);
673 bcc_ptr += strlen(init_utsname()->release) + 1;
674
675 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
676 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
677
678 *pbcc_area = bcc_ptr;
679 }
680
681 static void
decode_unicode_ssetup(char ** pbcc_area,int bleft,struct cifs_ses * ses,const struct nls_table * nls_cp)682 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
683 const struct nls_table *nls_cp)
684 {
685 int len;
686 char *data = *pbcc_area;
687
688 cifs_dbg(FYI, "bleft %d\n", bleft);
689
690 kfree(ses->serverOS);
691 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
692 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
693 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
694 data += len;
695 bleft -= len;
696 if (bleft <= 0)
697 return;
698
699 kfree(ses->serverNOS);
700 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
701 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
702 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
703 data += len;
704 bleft -= len;
705 if (bleft <= 0)
706 return;
707
708 kfree(ses->serverDomain);
709 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
710 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
711
712 return;
713 }
714
decode_ascii_ssetup(char ** pbcc_area,__u16 bleft,struct cifs_ses * ses,const struct nls_table * nls_cp)715 static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
716 struct cifs_ses *ses,
717 const struct nls_table *nls_cp)
718 {
719 int len;
720 char *bcc_ptr = *pbcc_area;
721
722 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
723
724 len = strnlen(bcc_ptr, bleft);
725 if (len >= bleft)
726 return;
727
728 kfree(ses->serverOS);
729
730 ses->serverOS = kmalloc(len + 1, GFP_KERNEL);
731 if (ses->serverOS) {
732 memcpy(ses->serverOS, bcc_ptr, len);
733 ses->serverOS[len] = 0;
734 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
735 cifs_dbg(FYI, "OS/2 server\n");
736 }
737
738 bcc_ptr += len + 1;
739 bleft -= len + 1;
740
741 len = strnlen(bcc_ptr, bleft);
742 if (len >= bleft)
743 return;
744
745 kfree(ses->serverNOS);
746
747 ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);
748 if (ses->serverNOS) {
749 memcpy(ses->serverNOS, bcc_ptr, len);
750 ses->serverNOS[len] = 0;
751 }
752
753 bcc_ptr += len + 1;
754 bleft -= len + 1;
755
756 len = strnlen(bcc_ptr, bleft);
757 if (len > bleft)
758 return;
759
760 /* No domain field in LANMAN case. Domain is
761 returned by old servers in the SMB negprot response */
762 /* BB For newer servers which do not support Unicode,
763 but thus do return domain here we could add parsing
764 for it later, but it is not very important */
765 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
766 }
767 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
768
decode_ntlmssp_challenge(char * bcc_ptr,int blob_len,struct cifs_ses * ses)769 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
770 struct cifs_ses *ses)
771 {
772 unsigned int tioffset; /* challenge message target info area */
773 unsigned int tilen; /* challenge message target info area length */
774 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
775 __u32 server_flags;
776
777 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
778 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
779 return -EINVAL;
780 }
781
782 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
783 cifs_dbg(VFS, "blob signature incorrect %s\n",
784 pblob->Signature);
785 return -EINVAL;
786 }
787 if (pblob->MessageType != NtLmChallenge) {
788 cifs_dbg(VFS, "Incorrect message type %d\n",
789 pblob->MessageType);
790 return -EINVAL;
791 }
792
793 server_flags = le32_to_cpu(pblob->NegotiateFlags);
794 cifs_dbg(FYI, "%s: negotiate=0x%08x challenge=0x%08x\n", __func__,
795 ses->ntlmssp->client_flags, server_flags);
796
797 if ((ses->ntlmssp->client_flags & (NTLMSSP_NEGOTIATE_SEAL | NTLMSSP_NEGOTIATE_SIGN)) &&
798 (!(server_flags & NTLMSSP_NEGOTIATE_56) && !(server_flags & NTLMSSP_NEGOTIATE_128))) {
799 cifs_dbg(VFS, "%s: requested signing/encryption but server did not return either 56-bit or 128-bit session key size\n",
800 __func__);
801 return -EINVAL;
802 }
803 if (!(server_flags & NTLMSSP_NEGOTIATE_NTLM) && !(server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) {
804 cifs_dbg(VFS, "%s: server does not seem to support either NTLMv1 or NTLMv2\n", __func__);
805 return -EINVAL;
806 }
807 if (ses->server->sign && !(server_flags & NTLMSSP_NEGOTIATE_SIGN)) {
808 cifs_dbg(VFS, "%s: forced packet signing but server does not seem to support it\n",
809 __func__);
810 return -EOPNOTSUPP;
811 }
812 if ((ses->ntlmssp->client_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
813 !(server_flags & NTLMSSP_NEGOTIATE_KEY_XCH))
814 pr_warn_once("%s: authentication has been weakened as server does not support key exchange\n",
815 __func__);
816
817 ses->ntlmssp->server_flags = server_flags;
818
819 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
820 /* In particular we can examine sign flags */
821 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
822 we must set the MIC field of the AUTHENTICATE_MESSAGE */
823
824 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
825 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
826 if (tioffset > blob_len || tioffset + tilen > blob_len) {
827 cifs_dbg(VFS, "tioffset + tilen too high %u + %u\n",
828 tioffset, tilen);
829 return -EINVAL;
830 }
831 if (tilen) {
832 kfree_sensitive(ses->auth_key.response);
833 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
834 GFP_KERNEL);
835 if (!ses->auth_key.response) {
836 cifs_dbg(VFS, "Challenge target info alloc failure\n");
837 return -ENOMEM;
838 }
839 ses->auth_key.len = tilen;
840 }
841
842 return 0;
843 }
844
size_of_ntlmssp_blob(struct cifs_ses * ses,int base_size)845 static int size_of_ntlmssp_blob(struct cifs_ses *ses, int base_size)
846 {
847 int sz = base_size + ses->auth_key.len
848 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
849
850 if (ses->domainName)
851 sz += sizeof(__le16) * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
852 else
853 sz += sizeof(__le16);
854
855 if (ses->user_name)
856 sz += sizeof(__le16) * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
857 else
858 sz += sizeof(__le16);
859
860 if (ses->workstation_name[0])
861 sz += sizeof(__le16) * strnlen(ses->workstation_name,
862 ntlmssp_workstation_name_size(ses));
863 else
864 sz += sizeof(__le16);
865
866 return sz;
867 }
868
cifs_security_buffer_from_str(SECURITY_BUFFER * pbuf,char * str_value,int str_length,unsigned char * pstart,unsigned char ** pcur,const struct nls_table * nls_cp)869 static inline void cifs_security_buffer_from_str(SECURITY_BUFFER *pbuf,
870 char *str_value,
871 int str_length,
872 unsigned char *pstart,
873 unsigned char **pcur,
874 const struct nls_table *nls_cp)
875 {
876 unsigned char *tmp = pstart;
877 int len;
878
879 if (!pbuf)
880 return;
881
882 if (!pcur)
883 pcur = &tmp;
884
885 if (!str_value) {
886 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
887 pbuf->Length = 0;
888 pbuf->MaximumLength = 0;
889 *pcur += sizeof(__le16);
890 } else {
891 len = cifs_strtoUTF16((__le16 *)*pcur,
892 str_value,
893 str_length,
894 nls_cp);
895 len *= sizeof(__le16);
896 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
897 pbuf->Length = cpu_to_le16(len);
898 pbuf->MaximumLength = cpu_to_le16(len);
899 *pcur += len;
900 }
901 }
902
903 /* BB Move to ntlmssp.c eventually */
904
build_ntlmssp_negotiate_blob(unsigned char ** pbuffer,u16 * buflen,struct cifs_ses * ses,struct TCP_Server_Info * server,const struct nls_table * nls_cp)905 int build_ntlmssp_negotiate_blob(unsigned char **pbuffer,
906 u16 *buflen,
907 struct cifs_ses *ses,
908 struct TCP_Server_Info *server,
909 const struct nls_table *nls_cp)
910 {
911 int rc = 0;
912 NEGOTIATE_MESSAGE *sec_blob;
913 __u32 flags;
914 unsigned char *tmp;
915 int len;
916
917 len = size_of_ntlmssp_blob(ses, sizeof(NEGOTIATE_MESSAGE));
918 *pbuffer = kmalloc(len, GFP_KERNEL);
919 if (!*pbuffer) {
920 rc = -ENOMEM;
921 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
922 *buflen = 0;
923 goto setup_ntlm_neg_ret;
924 }
925 sec_blob = (NEGOTIATE_MESSAGE *)*pbuffer;
926
927 memset(*pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
928 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
929 sec_blob->MessageType = NtLmNegotiate;
930
931 /* BB is NTLMV2 session security format easier to use here? */
932 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
933 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
934 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
935 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
936 NTLMSSP_NEGOTIATE_SIGN;
937 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
938 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
939
940 tmp = *pbuffer + sizeof(NEGOTIATE_MESSAGE);
941 ses->ntlmssp->client_flags = flags;
942 sec_blob->NegotiateFlags = cpu_to_le32(flags);
943
944 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
945 cifs_security_buffer_from_str(&sec_blob->DomainName,
946 NULL,
947 CIFS_MAX_DOMAINNAME_LEN,
948 *pbuffer, &tmp,
949 nls_cp);
950
951 cifs_security_buffer_from_str(&sec_blob->WorkstationName,
952 NULL,
953 CIFS_MAX_WORKSTATION_LEN,
954 *pbuffer, &tmp,
955 nls_cp);
956
957 *buflen = tmp - *pbuffer;
958 setup_ntlm_neg_ret:
959 return rc;
960 }
961
962 /*
963 * Build ntlmssp blob with additional fields, such as version,
964 * supported by modern servers. For safety limit to SMB3 or later
965 * See notes in MS-NLMP Section 2.2.2.1 e.g.
966 */
build_ntlmssp_smb3_negotiate_blob(unsigned char ** pbuffer,u16 * buflen,struct cifs_ses * ses,struct TCP_Server_Info * server,const struct nls_table * nls_cp)967 int build_ntlmssp_smb3_negotiate_blob(unsigned char **pbuffer,
968 u16 *buflen,
969 struct cifs_ses *ses,
970 struct TCP_Server_Info *server,
971 const struct nls_table *nls_cp)
972 {
973 int rc = 0;
974 struct negotiate_message *sec_blob;
975 __u32 flags;
976 unsigned char *tmp;
977 int len;
978
979 len = size_of_ntlmssp_blob(ses, sizeof(struct negotiate_message));
980 *pbuffer = kmalloc(len, GFP_KERNEL);
981 if (!*pbuffer) {
982 rc = -ENOMEM;
983 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
984 *buflen = 0;
985 goto setup_ntlm_smb3_neg_ret;
986 }
987 sec_blob = (struct negotiate_message *)*pbuffer;
988
989 memset(*pbuffer, 0, sizeof(struct negotiate_message));
990 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
991 sec_blob->MessageType = NtLmNegotiate;
992
993 /* BB is NTLMV2 session security format easier to use here? */
994 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
995 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
996 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
997 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
998 NTLMSSP_NEGOTIATE_SIGN | NTLMSSP_NEGOTIATE_VERSION;
999 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
1000 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
1001
1002 sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR;
1003 sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL;
1004 sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD);
1005 sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
1006
1007 tmp = *pbuffer + sizeof(struct negotiate_message);
1008 ses->ntlmssp->client_flags = flags;
1009 sec_blob->NegotiateFlags = cpu_to_le32(flags);
1010
1011 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
1012 cifs_security_buffer_from_str(&sec_blob->DomainName,
1013 NULL,
1014 CIFS_MAX_DOMAINNAME_LEN,
1015 *pbuffer, &tmp,
1016 nls_cp);
1017
1018 cifs_security_buffer_from_str(&sec_blob->WorkstationName,
1019 NULL,
1020 CIFS_MAX_WORKSTATION_LEN,
1021 *pbuffer, &tmp,
1022 nls_cp);
1023
1024 *buflen = tmp - *pbuffer;
1025 setup_ntlm_smb3_neg_ret:
1026 return rc;
1027 }
1028
1029
1030 /* See MS-NLMP 2.2.1.3 */
build_ntlmssp_auth_blob(unsigned char ** pbuffer,u16 * buflen,struct cifs_ses * ses,struct TCP_Server_Info * server,const struct nls_table * nls_cp)1031 int build_ntlmssp_auth_blob(unsigned char **pbuffer,
1032 u16 *buflen,
1033 struct cifs_ses *ses,
1034 struct TCP_Server_Info *server,
1035 const struct nls_table *nls_cp)
1036 {
1037 int rc;
1038 AUTHENTICATE_MESSAGE *sec_blob;
1039 __u32 flags;
1040 unsigned char *tmp;
1041 int len;
1042
1043 rc = setup_ntlmv2_rsp(ses, nls_cp);
1044 if (rc) {
1045 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
1046 *buflen = 0;
1047 goto setup_ntlmv2_ret;
1048 }
1049
1050 len = size_of_ntlmssp_blob(ses, sizeof(AUTHENTICATE_MESSAGE));
1051 *pbuffer = kmalloc(len, GFP_KERNEL);
1052 if (!*pbuffer) {
1053 rc = -ENOMEM;
1054 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
1055 *buflen = 0;
1056 goto setup_ntlmv2_ret;
1057 }
1058 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
1059
1060 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
1061 sec_blob->MessageType = NtLmAuthenticate;
1062
1063 flags = ses->ntlmssp->server_flags | NTLMSSP_REQUEST_TARGET |
1064 NTLMSSP_NEGOTIATE_TARGET_INFO | NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED;
1065 /* we only send version information in ntlmssp negotiate, so do not set this flag */
1066 flags = flags & ~NTLMSSP_NEGOTIATE_VERSION;
1067 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
1068 sec_blob->NegotiateFlags = cpu_to_le32(flags);
1069
1070 sec_blob->LmChallengeResponse.BufferOffset =
1071 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
1072 sec_blob->LmChallengeResponse.Length = 0;
1073 sec_blob->LmChallengeResponse.MaximumLength = 0;
1074
1075 sec_blob->NtChallengeResponse.BufferOffset =
1076 cpu_to_le32(tmp - *pbuffer);
1077 if (ses->user_name != NULL) {
1078 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1079 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1080 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1081
1082 sec_blob->NtChallengeResponse.Length =
1083 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1084 sec_blob->NtChallengeResponse.MaximumLength =
1085 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1086 } else {
1087 /*
1088 * don't send an NT Response for anonymous access
1089 */
1090 sec_blob->NtChallengeResponse.Length = 0;
1091 sec_blob->NtChallengeResponse.MaximumLength = 0;
1092 }
1093
1094 cifs_security_buffer_from_str(&sec_blob->DomainName,
1095 ses->domainName,
1096 CIFS_MAX_DOMAINNAME_LEN,
1097 *pbuffer, &tmp,
1098 nls_cp);
1099
1100 cifs_security_buffer_from_str(&sec_blob->UserName,
1101 ses->user_name,
1102 CIFS_MAX_USERNAME_LEN,
1103 *pbuffer, &tmp,
1104 nls_cp);
1105
1106 cifs_security_buffer_from_str(&sec_blob->WorkstationName,
1107 ses->workstation_name,
1108 ntlmssp_workstation_name_size(ses),
1109 *pbuffer, &tmp,
1110 nls_cp);
1111
1112 if ((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
1113 (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess) &&
1114 !calc_seckey(ses)) {
1115 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
1116 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
1117 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
1118 sec_blob->SessionKey.MaximumLength =
1119 cpu_to_le16(CIFS_CPHTXT_SIZE);
1120 tmp += CIFS_CPHTXT_SIZE;
1121 } else {
1122 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
1123 sec_blob->SessionKey.Length = 0;
1124 sec_blob->SessionKey.MaximumLength = 0;
1125 }
1126
1127 *buflen = tmp - *pbuffer;
1128 setup_ntlmv2_ret:
1129 return rc;
1130 }
1131
1132 enum securityEnum
cifs_select_sectype(struct TCP_Server_Info * server,enum securityEnum requested)1133 cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1134 {
1135 switch (server->negflavor) {
1136 case CIFS_NEGFLAVOR_EXTENDED:
1137 switch (requested) {
1138 case Kerberos:
1139 case RawNTLMSSP:
1140 return requested;
1141 case Unspecified:
1142 if (server->sec_ntlmssp &&
1143 (global_secflags & CIFSSEC_MAY_NTLMSSP))
1144 return RawNTLMSSP;
1145 if ((server->sec_kerberos || server->sec_mskerberos) &&
1146 (global_secflags & CIFSSEC_MAY_KRB5))
1147 return Kerberos;
1148 fallthrough;
1149 default:
1150 return Unspecified;
1151 }
1152 case CIFS_NEGFLAVOR_UNENCAP:
1153 switch (requested) {
1154 case NTLMv2:
1155 return requested;
1156 case Unspecified:
1157 if (global_secflags & CIFSSEC_MAY_NTLMV2)
1158 return NTLMv2;
1159 break;
1160 default:
1161 break;
1162 }
1163 fallthrough;
1164 default:
1165 return Unspecified;
1166 }
1167 }
1168
1169 struct sess_data {
1170 unsigned int xid;
1171 struct cifs_ses *ses;
1172 struct TCP_Server_Info *server;
1173 struct nls_table *nls_cp;
1174 void (*func)(struct sess_data *);
1175 int result;
1176
1177 /* we will send the SMB in three pieces:
1178 * a fixed length beginning part, an optional
1179 * SPNEGO blob (which can be zero length), and a
1180 * last part which will include the strings
1181 * and rest of bcc area. This allows us to avoid
1182 * a large buffer 17K allocation
1183 */
1184 int buf0_type;
1185 struct kvec iov[3];
1186 };
1187
1188 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1189 static int
sess_alloc_buffer(struct sess_data * sess_data,int wct)1190 sess_alloc_buffer(struct sess_data *sess_data, int wct)
1191 {
1192 int rc;
1193 struct cifs_ses *ses = sess_data->ses;
1194 struct smb_hdr *smb_buf;
1195
1196 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
1197 (void **)&smb_buf);
1198
1199 if (rc)
1200 return rc;
1201
1202 sess_data->iov[0].iov_base = (char *)smb_buf;
1203 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
1204 /*
1205 * This variable will be used to clear the buffer
1206 * allocated above in case of any error in the calling function.
1207 */
1208 sess_data->buf0_type = CIFS_SMALL_BUFFER;
1209
1210 /* 2000 big enough to fit max user, domain, NOS name etc. */
1211 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
1212 if (!sess_data->iov[2].iov_base) {
1213 rc = -ENOMEM;
1214 goto out_free_smb_buf;
1215 }
1216
1217 return 0;
1218
1219 out_free_smb_buf:
1220 cifs_small_buf_release(smb_buf);
1221 sess_data->iov[0].iov_base = NULL;
1222 sess_data->iov[0].iov_len = 0;
1223 sess_data->buf0_type = CIFS_NO_BUFFER;
1224 return rc;
1225 }
1226
1227 static void
sess_free_buffer(struct sess_data * sess_data)1228 sess_free_buffer(struct sess_data *sess_data)
1229 {
1230 struct kvec *iov = sess_data->iov;
1231
1232 /*
1233 * Zero the session data before freeing, as it might contain sensitive info (keys, etc).
1234 * Note that iov[1] is already freed by caller.
1235 */
1236 if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
1237 memzero_explicit(iov[0].iov_base, iov[0].iov_len);
1238
1239 free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
1240 sess_data->buf0_type = CIFS_NO_BUFFER;
1241 kfree_sensitive(iov[2].iov_base);
1242 }
1243
1244 static int
sess_establish_session(struct sess_data * sess_data)1245 sess_establish_session(struct sess_data *sess_data)
1246 {
1247 struct cifs_ses *ses = sess_data->ses;
1248 struct TCP_Server_Info *server = sess_data->server;
1249
1250 cifs_server_lock(server);
1251 if (!server->session_estab) {
1252 if (server->sign) {
1253 server->session_key.response =
1254 kmemdup(ses->auth_key.response,
1255 ses->auth_key.len, GFP_KERNEL);
1256 if (!server->session_key.response) {
1257 cifs_server_unlock(server);
1258 return -ENOMEM;
1259 }
1260 server->session_key.len =
1261 ses->auth_key.len;
1262 }
1263 server->sequence_number = 0x2;
1264 server->session_estab = true;
1265 }
1266 cifs_server_unlock(server);
1267
1268 cifs_dbg(FYI, "CIFS session established successfully\n");
1269 return 0;
1270 }
1271
1272 static int
sess_sendreceive(struct sess_data * sess_data)1273 sess_sendreceive(struct sess_data *sess_data)
1274 {
1275 int rc;
1276 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
1277 __u16 count;
1278 struct kvec rsp_iov = { NULL, 0 };
1279
1280 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
1281 be32_add_cpu(&smb_buf->smb_buf_length, count);
1282 put_bcc(count, smb_buf);
1283
1284 rc = SendReceive2(sess_data->xid, sess_data->ses,
1285 sess_data->iov, 3 /* num_iovecs */,
1286 &sess_data->buf0_type,
1287 CIFS_LOG_ERROR, &rsp_iov);
1288 cifs_small_buf_release(sess_data->iov[0].iov_base);
1289 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1290
1291 return rc;
1292 }
1293
1294 static void
sess_auth_ntlmv2(struct sess_data * sess_data)1295 sess_auth_ntlmv2(struct sess_data *sess_data)
1296 {
1297 int rc = 0;
1298 struct smb_hdr *smb_buf;
1299 SESSION_SETUP_ANDX *pSMB;
1300 char *bcc_ptr;
1301 struct cifs_ses *ses = sess_data->ses;
1302 struct TCP_Server_Info *server = sess_data->server;
1303 __u32 capabilities;
1304 __u16 bytes_remaining;
1305
1306 /* old style NTLM sessionsetup */
1307 /* wct = 13 */
1308 rc = sess_alloc_buffer(sess_data, 13);
1309 if (rc)
1310 goto out;
1311
1312 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1313 bcc_ptr = sess_data->iov[2].iov_base;
1314 capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1315
1316 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
1317
1318 /* LM2 password would be here if we supported it */
1319 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
1320
1321 if (ses->user_name != NULL) {
1322 /* calculate nlmv2 response and session key */
1323 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
1324 if (rc) {
1325 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
1326 goto out;
1327 }
1328
1329 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
1330 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1331 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
1332
1333 /* set case sensitive password length after tilen may get
1334 * assigned, tilen is 0 otherwise.
1335 */
1336 pSMB->req_no_secext.CaseSensitivePasswordLength =
1337 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
1338 } else {
1339 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
1340 }
1341
1342 if (ses->capabilities & CAP_UNICODE) {
1343 if (!IS_ALIGNED(sess_data->iov[0].iov_len, 2)) {
1344 *bcc_ptr = 0;
1345 bcc_ptr++;
1346 }
1347 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1348 } else {
1349 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1350 }
1351
1352
1353 sess_data->iov[2].iov_len = (long) bcc_ptr -
1354 (long) sess_data->iov[2].iov_base;
1355
1356 rc = sess_sendreceive(sess_data);
1357 if (rc)
1358 goto out;
1359
1360 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1361 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1362
1363 if (smb_buf->WordCount != 3) {
1364 rc = -EIO;
1365 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1366 goto out;
1367 }
1368
1369 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1370 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1371
1372 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1373 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1374
1375 bytes_remaining = get_bcc(smb_buf);
1376 bcc_ptr = pByteArea(smb_buf);
1377
1378 /* BB check if Unicode and decode strings */
1379 if (bytes_remaining == 0) {
1380 /* no string area to decode, do nothing */
1381 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1382 /* unicode string area must be word-aligned */
1383 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1384 ++bcc_ptr;
1385 --bytes_remaining;
1386 }
1387 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1388 sess_data->nls_cp);
1389 } else {
1390 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1391 sess_data->nls_cp);
1392 }
1393
1394 rc = sess_establish_session(sess_data);
1395 out:
1396 sess_data->result = rc;
1397 sess_data->func = NULL;
1398 sess_free_buffer(sess_data);
1399 kfree_sensitive(ses->auth_key.response);
1400 ses->auth_key.response = NULL;
1401 }
1402
1403 #ifdef CONFIG_CIFS_UPCALL
1404 static void
sess_auth_kerberos(struct sess_data * sess_data)1405 sess_auth_kerberos(struct sess_data *sess_data)
1406 {
1407 int rc = 0;
1408 struct smb_hdr *smb_buf;
1409 SESSION_SETUP_ANDX *pSMB;
1410 char *bcc_ptr;
1411 struct cifs_ses *ses = sess_data->ses;
1412 struct TCP_Server_Info *server = sess_data->server;
1413 __u32 capabilities;
1414 __u16 bytes_remaining;
1415 struct key *spnego_key = NULL;
1416 struct cifs_spnego_msg *msg;
1417 u16 blob_len;
1418
1419 /* extended security */
1420 /* wct = 12 */
1421 rc = sess_alloc_buffer(sess_data, 12);
1422 if (rc)
1423 goto out;
1424
1425 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1426 bcc_ptr = sess_data->iov[2].iov_base;
1427 capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1428
1429 spnego_key = cifs_get_spnego_key(ses, server);
1430 if (IS_ERR(spnego_key)) {
1431 rc = PTR_ERR(spnego_key);
1432 spnego_key = NULL;
1433 goto out;
1434 }
1435
1436 msg = spnego_key->payload.data[0];
1437 /*
1438 * check version field to make sure that cifs.upcall is
1439 * sending us a response in an expected form
1440 */
1441 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1442 cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n",
1443 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1444 rc = -EKEYREJECTED;
1445 goto out_put_spnego_key;
1446 }
1447
1448 kfree_sensitive(ses->auth_key.response);
1449 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1450 GFP_KERNEL);
1451 if (!ses->auth_key.response) {
1452 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1453 msg->sesskey_len);
1454 rc = -ENOMEM;
1455 goto out_put_spnego_key;
1456 }
1457 ses->auth_key.len = msg->sesskey_len;
1458
1459 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1460 capabilities |= CAP_EXTENDED_SECURITY;
1461 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1462 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1463 sess_data->iov[1].iov_len = msg->secblob_len;
1464 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1465
1466 if (ses->capabilities & CAP_UNICODE) {
1467 /* unicode strings must be word aligned */
1468 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
1469 *bcc_ptr = 0;
1470 bcc_ptr++;
1471 }
1472 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1473 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1474 } else {
1475 /* BB: is this right? */
1476 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1477 }
1478
1479 sess_data->iov[2].iov_len = (long) bcc_ptr -
1480 (long) sess_data->iov[2].iov_base;
1481
1482 rc = sess_sendreceive(sess_data);
1483 if (rc)
1484 goto out_put_spnego_key;
1485
1486 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1487 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1488
1489 if (smb_buf->WordCount != 4) {
1490 rc = -EIO;
1491 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1492 goto out_put_spnego_key;
1493 }
1494
1495 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1496 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1497
1498 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1499 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1500
1501 bytes_remaining = get_bcc(smb_buf);
1502 bcc_ptr = pByteArea(smb_buf);
1503
1504 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1505 if (blob_len > bytes_remaining) {
1506 cifs_dbg(VFS, "bad security blob length %d\n",
1507 blob_len);
1508 rc = -EINVAL;
1509 goto out_put_spnego_key;
1510 }
1511 bcc_ptr += blob_len;
1512 bytes_remaining -= blob_len;
1513
1514 /* BB check if Unicode and decode strings */
1515 if (bytes_remaining == 0) {
1516 /* no string area to decode, do nothing */
1517 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1518 /* unicode string area must be word-aligned */
1519 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1520 ++bcc_ptr;
1521 --bytes_remaining;
1522 }
1523 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1524 sess_data->nls_cp);
1525 } else {
1526 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1527 sess_data->nls_cp);
1528 }
1529
1530 rc = sess_establish_session(sess_data);
1531 out_put_spnego_key:
1532 key_invalidate(spnego_key);
1533 key_put(spnego_key);
1534 out:
1535 sess_data->result = rc;
1536 sess_data->func = NULL;
1537 sess_free_buffer(sess_data);
1538 kfree_sensitive(ses->auth_key.response);
1539 ses->auth_key.response = NULL;
1540 }
1541
1542 #endif /* ! CONFIG_CIFS_UPCALL */
1543
1544 /*
1545 * The required kvec buffers have to be allocated before calling this
1546 * function.
1547 */
1548 static int
_sess_auth_rawntlmssp_assemble_req(struct sess_data * sess_data)1549 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1550 {
1551 SESSION_SETUP_ANDX *pSMB;
1552 struct cifs_ses *ses = sess_data->ses;
1553 struct TCP_Server_Info *server = sess_data->server;
1554 __u32 capabilities;
1555 char *bcc_ptr;
1556
1557 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1558
1559 capabilities = cifs_ssetup_hdr(ses, server, pSMB);
1560 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1561 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1562 return -ENOSYS;
1563 }
1564
1565 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1566 capabilities |= CAP_EXTENDED_SECURITY;
1567 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1568
1569 bcc_ptr = sess_data->iov[2].iov_base;
1570 /* unicode strings must be word aligned */
1571 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
1572 *bcc_ptr = 0;
1573 bcc_ptr++;
1574 }
1575 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1576
1577 sess_data->iov[2].iov_len = (long) bcc_ptr -
1578 (long) sess_data->iov[2].iov_base;
1579
1580 return 0;
1581 }
1582
1583 static void
1584 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1585
1586 static void
sess_auth_rawntlmssp_negotiate(struct sess_data * sess_data)1587 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1588 {
1589 int rc;
1590 struct smb_hdr *smb_buf;
1591 SESSION_SETUP_ANDX *pSMB;
1592 struct cifs_ses *ses = sess_data->ses;
1593 struct TCP_Server_Info *server = sess_data->server;
1594 __u16 bytes_remaining;
1595 char *bcc_ptr;
1596 unsigned char *ntlmsspblob = NULL;
1597 u16 blob_len;
1598
1599 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1600
1601 /*
1602 * if memory allocation is successful, caller of this function
1603 * frees it.
1604 */
1605 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1606 if (!ses->ntlmssp) {
1607 rc = -ENOMEM;
1608 goto out;
1609 }
1610 ses->ntlmssp->sesskey_per_smbsess = false;
1611
1612 /* wct = 12 */
1613 rc = sess_alloc_buffer(sess_data, 12);
1614 if (rc)
1615 goto out;
1616
1617 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1618
1619 /* Build security blob before we assemble the request */
1620 rc = build_ntlmssp_negotiate_blob(&ntlmsspblob,
1621 &blob_len, ses, server,
1622 sess_data->nls_cp);
1623 if (rc)
1624 goto out_free_ntlmsspblob;
1625
1626 sess_data->iov[1].iov_len = blob_len;
1627 sess_data->iov[1].iov_base = ntlmsspblob;
1628 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1629
1630 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1631 if (rc)
1632 goto out_free_ntlmsspblob;
1633
1634 rc = sess_sendreceive(sess_data);
1635
1636 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1637 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1638
1639 /* If true, rc here is expected and not an error */
1640 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1641 smb_buf->Status.CifsError ==
1642 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1643 rc = 0;
1644
1645 if (rc)
1646 goto out_free_ntlmsspblob;
1647
1648 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1649
1650 if (smb_buf->WordCount != 4) {
1651 rc = -EIO;
1652 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1653 goto out_free_ntlmsspblob;
1654 }
1655
1656 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1657 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1658
1659 bytes_remaining = get_bcc(smb_buf);
1660 bcc_ptr = pByteArea(smb_buf);
1661
1662 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1663 if (blob_len > bytes_remaining) {
1664 cifs_dbg(VFS, "bad security blob length %d\n",
1665 blob_len);
1666 rc = -EINVAL;
1667 goto out_free_ntlmsspblob;
1668 }
1669
1670 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1671
1672 out_free_ntlmsspblob:
1673 kfree_sensitive(ntlmsspblob);
1674 out:
1675 sess_free_buffer(sess_data);
1676
1677 if (!rc) {
1678 sess_data->func = sess_auth_rawntlmssp_authenticate;
1679 return;
1680 }
1681
1682 /* Else error. Cleanup */
1683 kfree_sensitive(ses->auth_key.response);
1684 ses->auth_key.response = NULL;
1685 kfree_sensitive(ses->ntlmssp);
1686 ses->ntlmssp = NULL;
1687
1688 sess_data->func = NULL;
1689 sess_data->result = rc;
1690 }
1691
1692 static void
sess_auth_rawntlmssp_authenticate(struct sess_data * sess_data)1693 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1694 {
1695 int rc;
1696 struct smb_hdr *smb_buf;
1697 SESSION_SETUP_ANDX *pSMB;
1698 struct cifs_ses *ses = sess_data->ses;
1699 struct TCP_Server_Info *server = sess_data->server;
1700 __u16 bytes_remaining;
1701 char *bcc_ptr;
1702 unsigned char *ntlmsspblob = NULL;
1703 u16 blob_len;
1704
1705 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1706
1707 /* wct = 12 */
1708 rc = sess_alloc_buffer(sess_data, 12);
1709 if (rc)
1710 goto out;
1711
1712 /* Build security blob before we assemble the request */
1713 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1714 smb_buf = (struct smb_hdr *)pSMB;
1715 rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1716 &blob_len, ses, server,
1717 sess_data->nls_cp);
1718 if (rc)
1719 goto out_free_ntlmsspblob;
1720 sess_data->iov[1].iov_len = blob_len;
1721 sess_data->iov[1].iov_base = ntlmsspblob;
1722 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1723 /*
1724 * Make sure that we tell the server that we are using
1725 * the uid that it just gave us back on the response
1726 * (challenge)
1727 */
1728 smb_buf->Uid = ses->Suid;
1729
1730 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1731 if (rc)
1732 goto out_free_ntlmsspblob;
1733
1734 rc = sess_sendreceive(sess_data);
1735 if (rc)
1736 goto out_free_ntlmsspblob;
1737
1738 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1739 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1740 if (smb_buf->WordCount != 4) {
1741 rc = -EIO;
1742 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1743 goto out_free_ntlmsspblob;
1744 }
1745
1746 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1747 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1748
1749 if (ses->Suid != smb_buf->Uid) {
1750 ses->Suid = smb_buf->Uid;
1751 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1752 }
1753
1754 bytes_remaining = get_bcc(smb_buf);
1755 bcc_ptr = pByteArea(smb_buf);
1756 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1757 if (blob_len > bytes_remaining) {
1758 cifs_dbg(VFS, "bad security blob length %d\n",
1759 blob_len);
1760 rc = -EINVAL;
1761 goto out_free_ntlmsspblob;
1762 }
1763 bcc_ptr += blob_len;
1764 bytes_remaining -= blob_len;
1765
1766
1767 /* BB check if Unicode and decode strings */
1768 if (bytes_remaining == 0) {
1769 /* no string area to decode, do nothing */
1770 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1771 /* unicode string area must be word-aligned */
1772 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
1773 ++bcc_ptr;
1774 --bytes_remaining;
1775 }
1776 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1777 sess_data->nls_cp);
1778 } else {
1779 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1780 sess_data->nls_cp);
1781 }
1782
1783 out_free_ntlmsspblob:
1784 kfree_sensitive(ntlmsspblob);
1785 out:
1786 sess_free_buffer(sess_data);
1787
1788 if (!rc)
1789 rc = sess_establish_session(sess_data);
1790
1791 /* Cleanup */
1792 kfree_sensitive(ses->auth_key.response);
1793 ses->auth_key.response = NULL;
1794 kfree_sensitive(ses->ntlmssp);
1795 ses->ntlmssp = NULL;
1796
1797 sess_data->func = NULL;
1798 sess_data->result = rc;
1799 }
1800
select_sec(struct sess_data * sess_data)1801 static int select_sec(struct sess_data *sess_data)
1802 {
1803 int type;
1804 struct cifs_ses *ses = sess_data->ses;
1805 struct TCP_Server_Info *server = sess_data->server;
1806
1807 type = cifs_select_sectype(server, ses->sectype);
1808 cifs_dbg(FYI, "sess setup type %d\n", type);
1809 if (type == Unspecified) {
1810 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1811 return -EINVAL;
1812 }
1813
1814 switch (type) {
1815 case NTLMv2:
1816 sess_data->func = sess_auth_ntlmv2;
1817 break;
1818 case Kerberos:
1819 #ifdef CONFIG_CIFS_UPCALL
1820 sess_data->func = sess_auth_kerberos;
1821 break;
1822 #else
1823 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1824 return -ENOSYS;
1825 #endif /* CONFIG_CIFS_UPCALL */
1826 case RawNTLMSSP:
1827 sess_data->func = sess_auth_rawntlmssp_negotiate;
1828 break;
1829 default:
1830 cifs_dbg(VFS, "secType %d not supported!\n", type);
1831 return -ENOSYS;
1832 }
1833
1834 return 0;
1835 }
1836
CIFS_SessSetup(const unsigned int xid,struct cifs_ses * ses,struct TCP_Server_Info * server,const struct nls_table * nls_cp)1837 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1838 struct TCP_Server_Info *server,
1839 const struct nls_table *nls_cp)
1840 {
1841 int rc = 0;
1842 struct sess_data *sess_data;
1843
1844 if (ses == NULL) {
1845 WARN(1, "%s: ses == NULL!", __func__);
1846 return -EINVAL;
1847 }
1848
1849 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1850 if (!sess_data)
1851 return -ENOMEM;
1852
1853 sess_data->xid = xid;
1854 sess_data->ses = ses;
1855 sess_data->server = server;
1856 sess_data->buf0_type = CIFS_NO_BUFFER;
1857 sess_data->nls_cp = (struct nls_table *) nls_cp;
1858
1859 rc = select_sec(sess_data);
1860 if (rc)
1861 goto out;
1862
1863 while (sess_data->func)
1864 sess_data->func(sess_data);
1865
1866 /* Store result before we free sess_data */
1867 rc = sess_data->result;
1868
1869 out:
1870 kfree_sensitive(sess_data);
1871 return rc;
1872 }
1873 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1874
