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Merge tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm
[linux-2.6-block.git] / fs / cifs / sess.c
CommitLineData
3979877e
SF		 1/*
2 * fs/cifs/sess.c
3 *
4 * SMB/CIFS session setup handling routines
5 *
d185cda7 6 * Copyright (c) International Business Machines Corp., 2006, 2009
3979877e
SF		 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"
9c53588e 31#include <linux/utsname.h>
5a0e3ad6 32#include <linux/slab.h>
2442421b 33#include "cifs_spnego.h"
3979877e 34
96daf2b0 35static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB)
3979877e
SF		 36{
37 __u32 capabilities = 0;
38
39 /* init fields common to all four types of SessSetup */
eca6acf9
SF		 40 /* Note that offsets for first seven fields in req struct are same */
41 /* in CIFS Specs so does not matter which of 3 forms of struct */
42 /* that we use in next few lines */
43 /* Note that header is initialized to zero in header_assemble */
3979877e 44 pSMB->req.AndXCommand = 0xFF;
c974befa
JL		 45 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
46 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
47 USHRT_MAX));
3979877e 48 pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
bc09d141 49 pSMB->req.VcNumber = cpu_to_le16(1);
3979877e
SF		 50
51 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
52
790fe579 53 /* BB verify whether signing required on neg or just on auth frame
3979877e
SF		 54 (and NTLM case) */
55
56 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
57 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
58
38d77c50 59 if (ses->server->sign)
3979877e
SF		 60 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
61
62 if (ses->capabilities & CAP_UNICODE) {
63 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
64 capabilities |= CAP_UNICODE;
65 }
66 if (ses->capabilities & CAP_STATUS32) {
67 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
68 capabilities |= CAP_STATUS32;
69 }
70 if (ses->capabilities & CAP_DFS) {
71 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
72 capabilities |= CAP_DFS;
73 }
26f57364 74 if (ses->capabilities & CAP_UNIX)
3979877e 75 capabilities |= CAP_UNIX;
3979877e 76
3979877e
SF		 77 return capabilities;
78}
79
0d3a01fa
JL		 80static void
81unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
82{
83 char *bcc_ptr = *pbcc_area;
84 int bytes_ret = 0;
85
86 /* Copy OS version */
acbbb76a
SF		 87 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
88 nls_cp);
0d3a01fa 89 bcc_ptr += 2 * bytes_ret;
acbbb76a
SF		 90 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
91 32, nls_cp);
0d3a01fa
JL		 92 bcc_ptr += 2 * bytes_ret;
93 bcc_ptr += 2; /* trailing null */
94
acbbb76a
SF		 95 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
96 32, nls_cp);
0d3a01fa
JL		 97 bcc_ptr += 2 * bytes_ret;
98 bcc_ptr += 2; /* trailing null */
99
100 *pbcc_area = bcc_ptr;
101}
102
96daf2b0 103static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
0d3a01fa
JL		 104 const struct nls_table *nls_cp)
105{
106 char *bcc_ptr = *pbcc_area;
107 int bytes_ret = 0;
108
109 /* copy domain */
110 if (ses->domainName == NULL) {
111 /* Sending null domain better than using a bogus domain name (as
112 we did briefly in 2.6.18) since server will use its default */
113 *bcc_ptr = 0;
114 *(bcc_ptr+1) = 0;
115 bytes_ret = 0;
116 } else
acbbb76a 117 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
057d6332 118 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
0d3a01fa
JL		 119 bcc_ptr += 2 * bytes_ret;
120 bcc_ptr += 2; /* account for null terminator */
121
122 *pbcc_area = bcc_ptr;
123}
124
125
96daf2b0 126static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
790fe579 127 const struct nls_table *nls_cp)
3979877e 128{
790fe579 129 char *bcc_ptr = *pbcc_area;
3979877e
SF		 130 int bytes_ret = 0;
131
132 /* BB FIXME add check that strings total less
133 than 335 or will need to send them as arrays */
134
0223cf0b
SF		 135 /* unicode strings, must be word aligned before the call */
136/* if ((long) bcc_ptr % 2) {
3979877e
SF		 137 *bcc_ptr = 0;
138 bcc_ptr++;
0223cf0b 139 } */
3979877e 140 /* copy user */
8727c8a8 141 if (ses->user_name == NULL) {
6e659c63
SF		 142 /* null user mount */
143 *bcc_ptr = 0;
144 *(bcc_ptr+1) = 0;
301a6a31 145 } else {
acbbb76a 146 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
8c3a2b4c 147 CIFS_MAX_USERNAME_LEN, nls_cp);
3979877e
SF		 148 }
149 bcc_ptr += 2 * bytes_ret;
150 bcc_ptr += 2; /* account for null termination */
3979877e 151
0d3a01fa
JL		 152 unicode_domain_string(&bcc_ptr, ses, nls_cp);
153 unicode_oslm_strings(&bcc_ptr, nls_cp);
3979877e
SF		 154
155 *pbcc_area = bcc_ptr;
156}
157
96daf2b0 158static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
790fe579 159 const struct nls_table *nls_cp)
3979877e 160{
790fe579 161 char *bcc_ptr = *pbcc_area;
340625e6 162 int len;
3979877e
SF		 163
164 /* copy user */
165 /* BB what about null user mounts - check that we do this BB */
790fe579 166 /* copy user */
de47a417 167 if (ses->user_name != NULL) {
340625e6
RS		 168 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
169 if (WARN_ON_ONCE(len < 0))
170 len = CIFS_MAX_USERNAME_LEN - 1;
171 bcc_ptr += len;
de47a417 172 }
8727c8a8 173 /* else null user mount */
3979877e 174 *bcc_ptr = 0;
790fe579 175 bcc_ptr++; /* account for null termination */
3979877e 176
790fe579 177 /* copy domain */
790fe579 178 if (ses->domainName != NULL) {
340625e6
RS		 179 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
180 if (WARN_ON_ONCE(len < 0))
181 len = CIFS_MAX_DOMAINNAME_LEN - 1;
182 bcc_ptr += len;
790fe579 183 } /* else we will send a null domain name
6e659c63 184 so the server will default to its own domain */
3979877e
SF		 185 *bcc_ptr = 0;
186 bcc_ptr++;
187
188 /* BB check for overflow here */
189
190 strcpy(bcc_ptr, "Linux version ");
191 bcc_ptr += strlen("Linux version ");
96b644bd
SH		 192 strcpy(bcc_ptr, init_utsname()->release);
193 bcc_ptr += strlen(init_utsname()->release) + 1;
3979877e
SF		 194
195 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
196 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
197
790fe579 198 *pbcc_area = bcc_ptr;
3979877e
SF		 199}
200
59140797 201static void
96daf2b0 202decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
59140797 203 const struct nls_table *nls_cp)
3979877e 204{
59140797 205 int len;
790fe579 206 char *data = *pbcc_area;
3979877e 207
f96637be 208 cifs_dbg(FYI, "bleft %d\n", bleft);
3979877e 209
26f57364 210 kfree(ses->serverOS);
acbbb76a 211 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
f96637be 212 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
59140797
JL		 213 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
214 data += len;
215 bleft -= len;
216 if (bleft <= 0)
217 return;
3979877e 218
26f57364 219 kfree(ses->serverNOS);
acbbb76a 220 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
f96637be 221 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
59140797
JL		 222 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
223 data += len;
224 bleft -= len;
225 if (bleft <= 0)
226 return;
790fe579 227
26f57364 228 kfree(ses->serverDomain);
acbbb76a 229 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
f96637be 230 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
790fe579 231
59140797 232 return;
3979877e
SF		 233}
234
7d066459
JL		 235static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
236 struct cifs_ses *ses,
237 const struct nls_table *nls_cp)
3979877e 238{
3979877e 239 int len;
790fe579 240 char *bcc_ptr = *pbcc_area;
3979877e 241
f96637be 242 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
50c2f753 243
3979877e 244 len = strnlen(bcc_ptr, bleft);
790fe579 245 if (len >= bleft)
7d066459 246 return;
50c2f753 247
26f57364 248 kfree(ses->serverOS);
3979877e 249
340625e6 250 ses->serverOS = kmalloc(len + 1, GFP_KERNEL);
27b7edcf 251 if (ses->serverOS) {
340625e6
RS		 252 memcpy(ses->serverOS, bcc_ptr, len);
253 ses->serverOS[len] = 0;
27b7edcf
NJ		 254 if (strncmp(ses->serverOS, "OS/2", 4) == 0)
255 cifs_dbg(FYI, "OS/2 server\n");
256 }
3979877e
SF		 257
258 bcc_ptr += len + 1;
259 bleft -= len + 1;
260
261 len = strnlen(bcc_ptr, bleft);
790fe579 262 if (len >= bleft)
7d066459 263 return;
3979877e 264
26f57364 265 kfree(ses->serverNOS);
3979877e 266
340625e6
RS		 267 ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);
268 if (ses->serverNOS) {
269 memcpy(ses->serverNOS, bcc_ptr, len);
270 ses->serverNOS[len] = 0;
271 }
3979877e
SF		 272
273 bcc_ptr += len + 1;
274 bleft -= len + 1;
275
790fe579
SF		 276 len = strnlen(bcc_ptr, bleft);
277 if (len > bleft)
7d066459 278 return;
3979877e 279
9ac00b7d
SF		 280 /* No domain field in LANMAN case. Domain is
281 returned by old servers in the SMB negprot response */
282 /* BB For newer servers which do not support Unicode,
283 but thus do return domain here we could add parsing
284 for it later, but it is not very important */
f96637be 285 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
3979877e
SF		 286}
287
5478f9ba 288int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
96daf2b0 289 struct cifs_ses *ses)
0b3cc858 290{
2b149f11
SP		 291 unsigned int tioffset; /* challenge message target info area */
292 unsigned int tilen; /* challenge message target info area length */
293
0b3cc858
SF		 294 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
295
296 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
f96637be 297 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
0b3cc858
SF		 298 return -EINVAL;
299 }
300
301 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
f96637be
JP		 302 cifs_dbg(VFS, "blob signature incorrect %s\n",
303 pblob->Signature);
0b3cc858
SF		 304 return -EINVAL;
305 }
306 if (pblob->MessageType != NtLmChallenge) {
f96637be
JP		 307 cifs_dbg(VFS, "Incorrect message type %d\n",
308 pblob->MessageType);
0b3cc858
SF		 309 return -EINVAL;
310 }
311
d3686d54 312 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
0b3cc858
SF		 313 /* BB we could decode pblob->NegotiateFlags; some may be useful */
314 /* In particular we can examine sign flags */
315 /* BB spec says that if AvId field of MsvAvTimestamp is populated then
316 we must set the MIC field of the AUTHENTICATE_MESSAGE */
d3686d54 317 ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags);
5443d130
SF		 318 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
319 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
4991a5fa 320 if (tioffset > blob_len || tioffset + tilen > blob_len) {
f96637be
JP		 321 cifs_dbg(VFS, "tioffset + tilen too high %u + %u",
322 tioffset, tilen);
4991a5fa
DC		 323 return -EINVAL;
324 }
d3686d54 325 if (tilen) {
f7f7c185
SMP		 326 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
327 GFP_KERNEL);
d3686d54 328 if (!ses->auth_key.response) {
f96637be 329 cifs_dbg(VFS, "Challenge target info alloc failure");
2b149f11
SP		 330 return -ENOMEM;
331 }
d3686d54 332 ses->auth_key.len = tilen;
2b149f11
SP		 333 }
334
0b3cc858
SF		 335 return 0;
336}
337
0b3cc858
SF		 338/* BB Move to ntlmssp.c eventually */
339
340/* We do not malloc the blob, it is passed in pbuffer, because
341 it is fixed size, and small, making this approach cleaner */
5478f9ba 342void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
96daf2b0 343 struct cifs_ses *ses)
0b3cc858
SF		 344{
345 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer;
346 __u32 flags;
347
df8fbc24 348 memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
0b3cc858
SF		 349 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
350 sec_blob->MessageType = NtLmNegotiate;
351
352 /* BB is NTLMV2 session security format easier to use here? */
353 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
354 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
cabfb368
PS		 355 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
356 NTLMSSP_NEGOTIATE_SEAL;
357 if (ses->server->sign)
745e507a 358 flags |= NTLMSSP_NEGOTIATE_SIGN;
cabfb368
PS		 359 if (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
360 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
0b3cc858 361
df8fbc24 362 sec_blob->NegotiateFlags = cpu_to_le32(flags);
0b3cc858
SF		 363
364 sec_blob->WorkstationName.BufferOffset = 0;
365 sec_blob->WorkstationName.Length = 0;
366 sec_blob->WorkstationName.MaximumLength = 0;
367
368 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
369 sec_blob->DomainName.BufferOffset = 0;
370 sec_blob->DomainName.Length = 0;
371 sec_blob->DomainName.MaximumLength = 0;
372}
373
b8da344b
JM		 374static int size_of_ntlmssp_blob(struct cifs_ses *ses)
375{
376 int sz = sizeof(AUTHENTICATE_MESSAGE) + ses->auth_key.len
377 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
378
379 if (ses->domainName)
380 sz += 2 * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
381 else
382 sz += 2;
383
384 if (ses->user_name)
385 sz += 2 * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
386 else
387 sz += 2;
388
389 return sz;
390}
391
392int build_ntlmssp_auth_blob(unsigned char **pbuffer,
89f150f4 393 u16 *buflen,
96daf2b0 394 struct cifs_ses *ses,
2b149f11 395 const struct nls_table *nls_cp)
0b3cc858 396{
2b149f11 397 int rc;
b8da344b 398 AUTHENTICATE_MESSAGE *sec_blob;
0b3cc858
SF		 399 __u32 flags;
400 unsigned char *tmp;
0b3cc858 401
b8da344b
JM		 402 rc = setup_ntlmv2_rsp(ses, nls_cp);
403 if (rc) {
404 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
405 *buflen = 0;
406 goto setup_ntlmv2_ret;
407 }
408 *pbuffer = kmalloc(size_of_ntlmssp_blob(ses), GFP_KERNEL);
126c97f4
NMG		 409 if (!*pbuffer) {
410 rc = -ENOMEM;
411 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
412 *buflen = 0;
413 goto setup_ntlmv2_ret;
414 }
b8da344b
JM		 415 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
416
0b3cc858
SF		 417 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
418 sec_blob->MessageType = NtLmAuthenticate;
419
420 flags = NTLMSSP_NEGOTIATE_56 |
421 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
422 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
cabfb368
PS		 423 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
424 NTLMSSP_NEGOTIATE_SEAL;
425 if (ses->server->sign)
0b3cc858 426 flags |= NTLMSSP_NEGOTIATE_SIGN;
cabfb368
PS		 427 if (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
428 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
0b3cc858 429
b8da344b 430 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
df8fbc24 431 sec_blob->NegotiateFlags = cpu_to_le32(flags);
0b3cc858
SF		 432
433 sec_blob->LmChallengeResponse.BufferOffset =
434 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
435 sec_blob->LmChallengeResponse.Length = 0;
436 sec_blob->LmChallengeResponse.MaximumLength = 0;
437
b8da344b
JM		 438 sec_blob->NtChallengeResponse.BufferOffset =
439 cpu_to_le32(tmp - *pbuffer);
cfda35d9 440 if (ses->user_name != NULL) {
cfda35d9
SM		 441 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
442 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
443 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
444
445 sec_blob->NtChallengeResponse.Length =
446 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
447 sec_blob->NtChallengeResponse.MaximumLength =
448 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
449 } else {
450 /*
451 * don't send an NT Response for anonymous access
452 */
453 sec_blob->NtChallengeResponse.Length = 0;
454 sec_blob->NtChallengeResponse.MaximumLength = 0;
2b149f11 455 }
0b3cc858
SF		 456
457 if (ses->domainName == NULL) {
b8da344b 458 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
0b3cc858
SF		 459 sec_blob->DomainName.Length = 0;
460 sec_blob->DomainName.MaximumLength = 0;
461 tmp += 2;
462 } else {
463 int len;
acbbb76a 464 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
202d772b 465 CIFS_MAX_DOMAINNAME_LEN, nls_cp);
0b3cc858 466 len *= 2; /* unicode is 2 bytes each */
b8da344b 467 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
0b3cc858
SF		 468 sec_blob->DomainName.Length = cpu_to_le16(len);
469 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
470 tmp += len;
471 }
472
8727c8a8 473 if (ses->user_name == NULL) {
b8da344b 474 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
0b3cc858
SF		 475 sec_blob->UserName.Length = 0;
476 sec_blob->UserName.MaximumLength = 0;
477 tmp += 2;
478 } else {
479 int len;
acbbb76a 480 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
8c3a2b4c 481 CIFS_MAX_USERNAME_LEN, nls_cp);
0b3cc858 482 len *= 2; /* unicode is 2 bytes each */
b8da344b 483 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
0b3cc858
SF		 484 sec_blob->UserName.Length = cpu_to_le16(len);
485 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
486 tmp += len;
487 }
488
b8da344b 489 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
0b3cc858
SF		 490 sec_blob->WorkstationName.Length = 0;
491 sec_blob->WorkstationName.MaximumLength = 0;
492 tmp += 2;
493
df8fbc24
SP		 494 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
495 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
496 && !calc_seckey(ses)) {
d3686d54 497 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
b8da344b 498 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
d2b91521
SP		 499 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
500 sec_blob->SessionKey.MaximumLength =
501 cpu_to_le16(CIFS_CPHTXT_SIZE);
502 tmp += CIFS_CPHTXT_SIZE;
503 } else {
b8da344b 504 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
d2b91521
SP		 505 sec_blob->SessionKey.Length = 0;
506 sec_blob->SessionKey.MaximumLength = 0;
507 }
2b149f11 508
b8da344b 509 *buflen = tmp - *pbuffer;
2b149f11 510setup_ntlmv2_ret:
89f150f4 511 return rc;
0b3cc858 512}
0b3cc858 513
3f618223 514enum securityEnum
ef65aaed 515cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
3f618223
JL		 516{
517 switch (server->negflavor) {
518 case CIFS_NEGFLAVOR_EXTENDED:
519 switch (requested) {
520 case Kerberos:
521 case RawNTLMSSP:
522 return requested;
523 case Unspecified:
524 if (server->sec_ntlmssp &&
525 (global_secflags & CIFSSEC_MAY_NTLMSSP))
526 return RawNTLMSSP;
527 if ((server->sec_kerberos || server->sec_mskerberos) &&
528 (global_secflags & CIFSSEC_MAY_KRB5))
529 return Kerberos;
530 /* Fallthrough */
531 default:
532 return Unspecified;
533 }
534 case CIFS_NEGFLAVOR_UNENCAP:
535 switch (requested) {
536 case NTLM:
537 case NTLMv2:
538 return requested;
539 case Unspecified:
540 if (global_secflags & CIFSSEC_MAY_NTLMV2)
541 return NTLMv2;
542 if (global_secflags & CIFSSEC_MAY_NTLM)
543 return NTLM;
3f618223 544 default:
dde2356c 545 break;
3f618223 546 }
07fa6010 547 /* Fallthrough - to attempt LANMAN authentication next */
3f618223
JL		 548 case CIFS_NEGFLAVOR_LANMAN:
549 switch (requested) {
550 case LANMAN:
551 return requested;
552 case Unspecified:
553 if (global_secflags & CIFSSEC_MAY_LANMAN)
554 return LANMAN;
555 /* Fallthrough */
556 default:
557 return Unspecified;
558 }
559 default:
560 return Unspecified;
561 }
562}
563
80a0e637
SP		 564struct sess_data {
565 unsigned int xid;
566 struct cifs_ses *ses;
567 struct nls_table *nls_cp;
568 void (*func)(struct sess_data *);
569 int result;
570
571 /* we will send the SMB in three pieces:
572 * a fixed length beginning part, an optional
573 * SPNEGO blob (which can be zero length), and a
574 * last part which will include the strings
575 * and rest of bcc area. This allows us to avoid
576 * a large buffer 17K allocation
577 */
578 int buf0_type;
579 struct kvec iov[3];
580};
581
582static int
583sess_alloc_buffer(struct sess_data *sess_data, int wct)
584{
585 int rc;
586 struct cifs_ses *ses = sess_data->ses;
587 struct smb_hdr *smb_buf;
588
589 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
590 (void **)&smb_buf);
591
592 if (rc)
593 return rc;
594
595 sess_data->iov[0].iov_base = (char *)smb_buf;
596 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
597 /*
598 * This variable will be used to clear the buffer
599 * allocated above in case of any error in the calling function.
600 */
601 sess_data->buf0_type = CIFS_SMALL_BUFFER;
602
603 /* 2000 big enough to fit max user, domain, NOS name etc. */
604 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
605 if (!sess_data->iov[2].iov_base) {
606 rc = -ENOMEM;
607 goto out_free_smb_buf;
608 }
609
610 return 0;
611
612out_free_smb_buf:
613 kfree(smb_buf);
614 sess_data->iov[0].iov_base = NULL;
615 sess_data->iov[0].iov_len = 0;
616 sess_data->buf0_type = CIFS_NO_BUFFER;
617 return rc;
618}
619
620static void
621sess_free_buffer(struct sess_data *sess_data)
622{
623
624 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
625 sess_data->buf0_type = CIFS_NO_BUFFER;
626 kfree(sess_data->iov[2].iov_base);
627}
628
629static int
630sess_establish_session(struct sess_data *sess_data)
631{
632 struct cifs_ses *ses = sess_data->ses;
633
634 mutex_lock(&ses->server->srv_mutex);
635 if (!ses->server->session_estab) {
636 if (ses->server->sign) {
637 ses->server->session_key.response =
638 kmemdup(ses->auth_key.response,
639 ses->auth_key.len, GFP_KERNEL);
640 if (!ses->server->session_key.response) {
641 mutex_unlock(&ses->server->srv_mutex);
642 return -ENOMEM;
643 }
644 ses->server->session_key.len =
645 ses->auth_key.len;
646 }
647 ses->server->sequence_number = 0x2;
648 ses->server->session_estab = true;
649 }
650 mutex_unlock(&ses->server->srv_mutex);
651
652 cifs_dbg(FYI, "CIFS session established successfully\n");
653 spin_lock(&GlobalMid_Lock);
654 ses->status = CifsGood;
655 ses->need_reconnect = false;
656 spin_unlock(&GlobalMid_Lock);
657
658 return 0;
659}
660
661static int
662sess_sendreceive(struct sess_data *sess_data)
663{
664 int rc;
665 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
666 __u16 count;
da502f7d 667 struct kvec rsp_iov = { NULL, 0 };
80a0e637
SP		 668
669 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
670 smb_buf->smb_buf_length =
671 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
672 put_bcc(count, smb_buf);
673
674 rc = SendReceive2(sess_data->xid, sess_data->ses,
675 sess_data->iov, 3 /* num_iovecs */,
676 &sess_data->buf0_type,
da502f7d
PS		 677 CIFS_LOG_ERROR, &rsp_iov);
678 cifs_small_buf_release(sess_data->iov[0].iov_base);
679 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
80a0e637
SP		 680
681 return rc;
682}
683
684/*
685 * LANMAN and plaintext are less secure and off by default.
686 * So we make this explicitly be turned on in kconfig (in the
687 * build) and turned on at runtime (changed from the default)
688 * in proc/fs/cifs or via mount parm. Unfortunately this is
689 * needed for old Win (e.g. Win95), some obscure NAS and OS/2
690 */
691#ifdef CONFIG_CIFS_WEAK_PW_HASH
692static void
693sess_auth_lanman(struct sess_data *sess_data)
694{
695 int rc = 0;
696 struct smb_hdr *smb_buf;
697 SESSION_SETUP_ANDX *pSMB;
698 char *bcc_ptr;
699 struct cifs_ses *ses = sess_data->ses;
700 char lnm_session_key[CIFS_AUTH_RESP_SIZE];
701 __u32 capabilities;
702 __u16 bytes_remaining;
703
704 /* lanman 2 style sessionsetup */
705 /* wct = 10 */
706 rc = sess_alloc_buffer(sess_data, 10);
707 if (rc)
708 goto out;
709
710 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
711 bcc_ptr = sess_data->iov[2].iov_base;
712 capabilities = cifs_ssetup_hdr(ses, pSMB);
713
714 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
715
fa8f3a35
SM		 716 if (ses->user_name != NULL) {
717 /* no capabilities flags in old lanman negotiation */
718 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
80a0e637 719
fa8f3a35
SM		 720 /* Calculate hash with password and copy into bcc_ptr.
721 * Encryption Key (stored as in cryptkey) gets used if the
722 * security mode bit in Negottiate Protocol response states
723 * to use challenge/response method (i.e. Password bit is 1).
724 */
725 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
726 ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
727 true : false, lnm_session_key);
a6b6befb
LB		 728 if (rc)
729 goto out;
80a0e637 730
fa8f3a35
SM		 731 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
732 bcc_ptr += CIFS_AUTH_RESP_SIZE;
733 } else {
734 pSMB->old_req.PasswordLength = 0;
735 }
80a0e637
SP		 736
737 /*
738 * can not sign if LANMAN negotiated so no need
739 * to calculate signing key? but what if server
740 * changed to do higher than lanman dialect and
741 * we reconnected would we ever calc signing_key?
742 */
743
744 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
745 /* Unicode not allowed for LANMAN dialects */
746 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
747
748 sess_data->iov[2].iov_len = (long) bcc_ptr -
749 (long) sess_data->iov[2].iov_base;
750
751 rc = sess_sendreceive(sess_data);
752 if (rc)
753 goto out;
754
755 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
756 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
757
758 /* lanman response has a word count of 3 */
759 if (smb_buf->WordCount != 3) {
760 rc = -EIO;
761 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
762 goto out;
763 }
764
765 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
766 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
767
768 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
769 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
770
771 bytes_remaining = get_bcc(smb_buf);
772 bcc_ptr = pByteArea(smb_buf);
773
774 /* BB check if Unicode and decode strings */
775 if (bytes_remaining == 0) {
776 /* no string area to decode, do nothing */
777 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
778 /* unicode string area must be word-aligned */
779 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
780 ++bcc_ptr;
781 --bytes_remaining;
782 }
783 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
784 sess_data->nls_cp);
785 } else {
786 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
787 sess_data->nls_cp);
788 }
789
790 rc = sess_establish_session(sess_data);
791out:
792 sess_data->result = rc;
793 sess_data->func = NULL;
794 sess_free_buffer(sess_data);
795}
796
80a0e637
SP		 797#endif
798
583cf7af
SP		 799static void
800sess_auth_ntlm(struct sess_data *sess_data)
801{
802 int rc = 0;
803 struct smb_hdr *smb_buf;
804 SESSION_SETUP_ANDX *pSMB;
805 char *bcc_ptr;
806 struct cifs_ses *ses = sess_data->ses;
807 __u32 capabilities;
808 __u16 bytes_remaining;
809
810 /* old style NTLM sessionsetup */
811 /* wct = 13 */
812 rc = sess_alloc_buffer(sess_data, 13);
813 if (rc)
814 goto out;
815
816 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
817 bcc_ptr = sess_data->iov[2].iov_base;
818 capabilities = cifs_ssetup_hdr(ses, pSMB);
819
820 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
777f69b8
SM		 821 if (ses->user_name != NULL) {
822 pSMB->req_no_secext.CaseInsensitivePasswordLength =
823 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
824 pSMB->req_no_secext.CaseSensitivePasswordLength =
825 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
826
827 /* calculate ntlm response and session key */
828 rc = setup_ntlm_response(ses, sess_data->nls_cp);
829 if (rc) {
830 cifs_dbg(VFS, "Error %d during NTLM authentication\n",
831 rc);
832 goto out;
833 }
583cf7af 834
777f69b8
SM		 835 /* copy ntlm response */
836 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
837 CIFS_AUTH_RESP_SIZE);
838 bcc_ptr += CIFS_AUTH_RESP_SIZE;
839 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
840 CIFS_AUTH_RESP_SIZE);
841 bcc_ptr += CIFS_AUTH_RESP_SIZE;
842 } else {
843 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
844 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
845 }
583cf7af
SP		 846
847 if (ses->capabilities & CAP_UNICODE) {
848 /* unicode strings must be word aligned */
849 if (sess_data->iov[0].iov_len % 2) {
850 *bcc_ptr = 0;
851 bcc_ptr++;
852 }
853 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
854 } else {
855 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
856 }
857
858
859 sess_data->iov[2].iov_len = (long) bcc_ptr -
860 (long) sess_data->iov[2].iov_base;
861
862 rc = sess_sendreceive(sess_data);
863 if (rc)
864 goto out;
865
866 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
867 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
868
869 if (smb_buf->WordCount != 3) {
870 rc = -EIO;
871 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
872 goto out;
873 }
874
875 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
876 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
877
878 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
879 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
880
881 bytes_remaining = get_bcc(smb_buf);
882 bcc_ptr = pByteArea(smb_buf);
883
884 /* BB check if Unicode and decode strings */
885 if (bytes_remaining == 0) {
886 /* no string area to decode, do nothing */
887 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
888 /* unicode string area must be word-aligned */
889 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
890 ++bcc_ptr;
891 --bytes_remaining;
892 }
893 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
894 sess_data->nls_cp);
895 } else {
896 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
897 sess_data->nls_cp);
898 }
899
900 rc = sess_establish_session(sess_data);
901out:
902 sess_data->result = rc;
903 sess_data->func = NULL;
904 sess_free_buffer(sess_data);
905 kfree(ses->auth_key.response);
906 ses->auth_key.response = NULL;
907}
908
909static void
910sess_auth_ntlmv2(struct sess_data *sess_data)
911{
912 int rc = 0;
913 struct smb_hdr *smb_buf;
914 SESSION_SETUP_ANDX *pSMB;
915 char *bcc_ptr;
916 struct cifs_ses *ses = sess_data->ses;
917 __u32 capabilities;
918 __u16 bytes_remaining;
919
920 /* old style NTLM sessionsetup */
921 /* wct = 13 */
922 rc = sess_alloc_buffer(sess_data, 13);
923 if (rc)
924 goto out;
925
926 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
927 bcc_ptr = sess_data->iov[2].iov_base;
928 capabilities = cifs_ssetup_hdr(ses, pSMB);
929
930 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
931
932 /* LM2 password would be here if we supported it */
933 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
934
1a967d6c
SM		 935 if (ses->user_name != NULL) {
936 /* calculate nlmv2 response and session key */
937 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
938 if (rc) {
939 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
940 goto out;
941 }
583cf7af 942
1a967d6c
SM		 943 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
944 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
945 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
583cf7af 946
1a967d6c
SM		 947 /* set case sensitive password length after tilen may get
948 * assigned, tilen is 0 otherwise.
949 */
950 pSMB->req_no_secext.CaseSensitivePasswordLength =
951 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
952 } else {
953 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
954 }
583cf7af
SP		 955
956 if (ses->capabilities & CAP_UNICODE) {
957 if (sess_data->iov[0].iov_len % 2) {
958 *bcc_ptr = 0;
959 bcc_ptr++;
960 }
961 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
962 } else {
963 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
964 }
965
966
967 sess_data->iov[2].iov_len = (long) bcc_ptr -
968 (long) sess_data->iov[2].iov_base;
969
970 rc = sess_sendreceive(sess_data);
971 if (rc)
972 goto out;
973
974 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
975 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
976
977 if (smb_buf->WordCount != 3) {
978 rc = -EIO;
979 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
980 goto out;
981 }
982
983 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
984 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
985
986 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
987 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
988
989 bytes_remaining = get_bcc(smb_buf);
990 bcc_ptr = pByteArea(smb_buf);
991
992 /* BB check if Unicode and decode strings */
993 if (bytes_remaining == 0) {
994 /* no string area to decode, do nothing */
995 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
996 /* unicode string area must be word-aligned */
997 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
998 ++bcc_ptr;
999 --bytes_remaining;
1000 }
1001 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1002 sess_data->nls_cp);
1003 } else {
1004 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1005 sess_data->nls_cp);
1006 }
1007
1008 rc = sess_establish_session(sess_data);
1009out:
1010 sess_data->result = rc;
1011 sess_data->func = NULL;
1012 sess_free_buffer(sess_data);
1013 kfree(ses->auth_key.response);
1014 ses->auth_key.response = NULL;
1015}
1016
ee03c646
SP		 1017#ifdef CONFIG_CIFS_UPCALL
1018static void
1019sess_auth_kerberos(struct sess_data *sess_data)
1020{
1021 int rc = 0;
1022 struct smb_hdr *smb_buf;
1023 SESSION_SETUP_ANDX *pSMB;
1024 char *bcc_ptr;
1025 struct cifs_ses *ses = sess_data->ses;
1026 __u32 capabilities;
1027 __u16 bytes_remaining;
1028 struct key *spnego_key = NULL;
1029 struct cifs_spnego_msg *msg;
1030 u16 blob_len;
1031
1032 /* extended security */
1033 /* wct = 12 */
1034 rc = sess_alloc_buffer(sess_data, 12);
1035 if (rc)
1036 goto out;
1037
1038 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1039 bcc_ptr = sess_data->iov[2].iov_base;
1040 capabilities = cifs_ssetup_hdr(ses, pSMB);
1041
1042 spnego_key = cifs_get_spnego_key(ses);
1043 if (IS_ERR(spnego_key)) {
1044 rc = PTR_ERR(spnego_key);
1045 spnego_key = NULL;
1046 goto out;
1047 }
1048
146aa8b1 1049 msg = spnego_key->payload.data[0];
ee03c646
SP		 1050 /*
1051 * check version field to make sure that cifs.upcall is
1052 * sending us a response in an expected form
1053 */
1054 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1055 cifs_dbg(VFS,
1056 "incorrect version of cifs.upcall (expected %d but got %d)",
1057 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1058 rc = -EKEYREJECTED;
1059 goto out_put_spnego_key;
1060 }
1061
1062 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1063 GFP_KERNEL);
1064 if (!ses->auth_key.response) {
1065 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory",
1066 msg->sesskey_len);
1067 rc = -ENOMEM;
1068 goto out_put_spnego_key;
1069 }
1070 ses->auth_key.len = msg->sesskey_len;
1071
1072 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1073 capabilities |= CAP_EXTENDED_SECURITY;
1074 pSMB->req.Capabilities = cpu_to_le32(capabilities);
1075 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1076 sess_data->iov[1].iov_len = msg->secblob_len;
1077 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1078
1079 if (ses->capabilities & CAP_UNICODE) {
1080 /* unicode strings must be word aligned */
1081 if ((sess_data->iov[0].iov_len
1082 + sess_data->iov[1].iov_len) % 2) {
1083 *bcc_ptr = 0;
1084 bcc_ptr++;
1085 }
1086 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1087 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1088 } else {
1089 /* BB: is this right? */
1090 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1091 }
1092
1093 sess_data->iov[2].iov_len = (long) bcc_ptr -
1094 (long) sess_data->iov[2].iov_base;
1095
1096 rc = sess_sendreceive(sess_data);
1097 if (rc)
1098 goto out_put_spnego_key;
1099
1100 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1101 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1102
1103 if (smb_buf->WordCount != 4) {
1104 rc = -EIO;
1105 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1106 goto out_put_spnego_key;
1107 }
1108
1109 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1110 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1111
1112 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1113 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1114
1115 bytes_remaining = get_bcc(smb_buf);
1116 bcc_ptr = pByteArea(smb_buf);
1117
1118 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1119 if (blob_len > bytes_remaining) {
1120 cifs_dbg(VFS, "bad security blob length %d\n",
1121 blob_len);
1122 rc = -EINVAL;
1123 goto out_put_spnego_key;
1124 }
1125 bcc_ptr += blob_len;
1126 bytes_remaining -= blob_len;
1127
1128 /* BB check if Unicode and decode strings */
1129 if (bytes_remaining == 0) {
1130 /* no string area to decode, do nothing */
1131 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1132 /* unicode string area must be word-aligned */
1133 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1134 ++bcc_ptr;
1135 --bytes_remaining;
1136 }
1137 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1138 sess_data->nls_cp);
1139 } else {
1140 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1141 sess_data->nls_cp);
1142 }
1143
1144 rc = sess_establish_session(sess_data);
1145out_put_spnego_key:
1146 key_invalidate(spnego_key);
1147 key_put(spnego_key);
1148out:
1149 sess_data->result = rc;
1150 sess_data->func = NULL;
1151 sess_free_buffer(sess_data);
1152 kfree(ses->auth_key.response);
1153 ses->auth_key.response = NULL;
1154}
1155
ee03c646 1156#endif /* ! CONFIG_CIFS_UPCALL */
583cf7af 1157
cc87c47d
SP		 1158/*
1159 * The required kvec buffers have to be allocated before calling this
1160 * function.
1161 */
1162static int
1163_sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
3979877e 1164{
3979877e 1165 SESSION_SETUP_ANDX *pSMB;
cc87c47d 1166 struct cifs_ses *ses = sess_data->ses;
3979877e 1167 __u32 capabilities;
cc87c47d 1168 char *bcc_ptr;
254e55ed 1169
cc87c47d 1170 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
cc87c47d
SP		 1171
1172 capabilities = cifs_ssetup_hdr(ses, pSMB);
1173 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1174 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1175 return -ENOSYS;
3534b850 1176 }
3979877e 1177
cc87c47d
SP		 1178 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1179 capabilities |= CAP_EXTENDED_SECURITY;
1180 pSMB->req.Capabilities |= cpu_to_le32(capabilities);
80a0e637 1181
cc87c47d
SP		 1182 bcc_ptr = sess_data->iov[2].iov_base;
1183 /* unicode strings must be word aligned */
1184 if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1185 *bcc_ptr = 0;
1186 bcc_ptr++;
3f618223 1187 }
cc87c47d 1188 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
3f618223 1189
cc87c47d
SP		 1190 sess_data->iov[2].iov_len = (long) bcc_ptr -
1191 (long) sess_data->iov[2].iov_base;
80a0e637 1192
cc87c47d
SP		 1193 return 0;
1194}
1195
1196static void
1197sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1198
1199static void
1200sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1201{
1202 int rc;
1203 struct smb_hdr *smb_buf;
1204 SESSION_SETUP_ANDX *pSMB;
1205 struct cifs_ses *ses = sess_data->ses;
1206 __u16 bytes_remaining;
1207 char *bcc_ptr;
1208 u16 blob_len;
1209
1210 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
5c234aa5 1211
cc87c47d
SP		 1212 /*
1213 * if memory allocation is successful, caller of this function
1214 * frees it.
1215 */
1216 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1217 if (!ses->ntlmssp) {
1218 rc = -ENOMEM;
1219 goto out;
d3686d54 1220 }
cc87c47d 1221 ses->ntlmssp->sesskey_per_smbsess = false;
d3686d54 1222
cc87c47d
SP		 1223 /* wct = 12 */
1224 rc = sess_alloc_buffer(sess_data, 12);
1225 if (rc)
1226 goto out;
0b3cc858 1227
cc87c47d 1228 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
3979877e 1229
cc87c47d
SP		 1230 /* Build security blob before we assemble the request */
1231 build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
1232 sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
1233 sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
1234 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
1235
1236 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
790fe579 1237 if (rc)
cc87c47d 1238 goto out;
3979877e 1239
cc87c47d 1240 rc = sess_sendreceive(sess_data);
3979877e 1241
cc87c47d
SP		 1242 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1243 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
750d1151 1244
cc87c47d
SP		 1245 /* If true, rc here is expected and not an error */
1246 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1247 smb_buf->Status.CifsError ==
1248 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1249 rc = 0;
2442421b 1250
cc87c47d
SP		 1251 if (rc)
1252 goto out;
1253
1254 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1255
1256 if (smb_buf->WordCount != 4) {
1257 rc = -EIO;
1258 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1259 goto out;
5e6e6232 1260 }
3979877e 1261
cc87c47d
SP		 1262 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
1263 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
2442421b 1264
cc87c47d
SP		 1265 bytes_remaining = get_bcc(smb_buf);
1266 bcc_ptr = pByteArea(smb_buf);
b4d6fcf1 1267
cc87c47d
SP		 1268 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1269 if (blob_len > bytes_remaining) {
1270 cifs_dbg(VFS, "bad security blob length %d\n",
1271 blob_len);
1272 rc = -EINVAL;
1273 goto out;
1274 }
0b3cc858 1275
cc87c47d
SP		 1276 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1277out:
1278 sess_free_buffer(sess_data);
1279
1280 if (!rc) {
1281 sess_data->func = sess_auth_rawntlmssp_authenticate;
1282 return;
3979877e
SF		 1283 }
1284
cc87c47d
SP		 1285 /* Else error. Cleanup */
1286 kfree(ses->auth_key.response);
1287 ses->auth_key.response = NULL;
1288 kfree(ses->ntlmssp);
1289 ses->ntlmssp = NULL;
2442421b 1290
cc87c47d
SP		 1291 sess_data->func = NULL;
1292 sess_data->result = rc;
1293}
3979877e 1294
cc87c47d
SP		 1295static void
1296sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1297{
1298 int rc;
1299 struct smb_hdr *smb_buf;
1300 SESSION_SETUP_ANDX *pSMB;
1301 struct cifs_ses *ses = sess_data->ses;
1302 __u16 bytes_remaining;
1303 char *bcc_ptr;
b8da344b 1304 unsigned char *ntlmsspblob = NULL;
cc87c47d 1305 u16 blob_len;
3979877e 1306
cc87c47d 1307 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
3979877e 1308
cc87c47d
SP		 1309 /* wct = 12 */
1310 rc = sess_alloc_buffer(sess_data, 12);
1311 if (rc)
1312 goto out;
3979877e 1313
cc87c47d
SP		 1314 /* Build security blob before we assemble the request */
1315 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1316 smb_buf = (struct smb_hdr *)pSMB;
b8da344b 1317 rc = build_ntlmssp_auth_blob(&ntlmsspblob,
cc87c47d
SP		 1318 &blob_len, ses, sess_data->nls_cp);
1319 if (rc)
1320 goto out_free_ntlmsspblob;
1321 sess_data->iov[1].iov_len = blob_len;
1322 sess_data->iov[1].iov_base = ntlmsspblob;
1323 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1324 /*
1325 * Make sure that we tell the server that we are using
1326 * the uid that it just gave us back on the response
1327 * (challenge)
1328 */
1329 smb_buf->Uid = ses->Suid;
1330
1331 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
0b3cc858 1332 if (rc)
cc87c47d 1333 goto out_free_ntlmsspblob;
0b3cc858 1334
cc87c47d
SP		 1335 rc = sess_sendreceive(sess_data);
1336 if (rc)
1337 goto out_free_ntlmsspblob;
1338
1339 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1340 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
583cf7af 1341 if (smb_buf->WordCount != 4) {
3979877e 1342 rc = -EIO;
f96637be 1343 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
cc87c47d 1344 goto out_free_ntlmsspblob;
3979877e 1345 }
cc87c47d
SP		 1346
1347 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
f96637be 1348 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
cc87c47d 1349
ee9bbf46
SP		 1350 if (ses->Suid != smb_buf->Uid) {
1351 ses->Suid = smb_buf->Uid;
1352 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1353 }
1354
690c522f 1355 bytes_remaining = get_bcc(smb_buf);
3979877e 1356 bcc_ptr = pByteArea(smb_buf);
583cf7af
SP		 1357 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1358 if (blob_len > bytes_remaining) {
1359 cifs_dbg(VFS, "bad security blob length %d\n",
cc87c47d 1360 blob_len);
583cf7af 1361 rc = -EINVAL;
cc87c47d 1362 goto out_free_ntlmsspblob;
790fe579 1363 }
583cf7af
SP		 1364 bcc_ptr += blob_len;
1365 bytes_remaining -= blob_len;
3979877e 1366
cc87c47d 1367
3979877e 1368 /* BB check if Unicode and decode strings */
fcda7f45
JL		 1369 if (bytes_remaining == 0) {
1370 /* no string area to decode, do nothing */
1371 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
27b87fe5
JL		 1372 /* unicode string area must be word-aligned */
1373 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1374 ++bcc_ptr;
1375 --bytes_remaining;
1376 }
cc87c47d
SP		 1377 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1378 sess_data->nls_cp);
27b87fe5 1379 } else {
cc87c47d
SP		 1380 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1381 sess_data->nls_cp);
27b87fe5 1382 }
50c2f753 1383
cc87c47d 1384out_free_ntlmsspblob:
2b149f11 1385 kfree(ntlmsspblob);
cc87c47d
SP		 1386out:
1387 sess_free_buffer(sess_data);
d4e63bd6 1388
cc87c47d
SP		 1389 if (!rc)
1390 rc = sess_establish_session(sess_data);
d4e63bd6 1391
cc87c47d 1392 /* Cleanup */
d4e63bd6
SP		 1393 kfree(ses->auth_key.response);
1394 ses->auth_key.response = NULL;
1395 kfree(ses->ntlmssp);
cc87c47d 1396 ses->ntlmssp = NULL;
d4e63bd6 1397
cc87c47d
SP		 1398 sess_data->func = NULL;
1399 sess_data->result = rc;
1400}
80a0e637 1401
27924075 1402static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
cc87c47d
SP		 1403{
1404 int type;
1405
ef65aaed 1406 type = cifs_select_sectype(ses->server, ses->sectype);
cc87c47d
SP		 1407 cifs_dbg(FYI, "sess setup type %d\n", type);
1408 if (type == Unspecified) {
1409 cifs_dbg(VFS,
1410 "Unable to select appropriate authentication method!");
1411 return -EINVAL;
1412 }
1413
1414 switch (type) {
1415 case LANMAN:
1416 /* LANMAN and plaintext are less secure and off by default.
1417 * So we make this explicitly be turned on in kconfig (in the
1418 * build) and turned on at runtime (changed from the default)
1419 * in proc/fs/cifs or via mount parm. Unfortunately this is
1420 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
1421#ifdef CONFIG_CIFS_WEAK_PW_HASH
1422 sess_data->func = sess_auth_lanman;
1423 break;
1424#else
1425 return -EOPNOTSUPP;
1426#endif
1427 case NTLM:
1428 sess_data->func = sess_auth_ntlm;
1429 break;
1430 case NTLMv2:
1431 sess_data->func = sess_auth_ntlmv2;
1432 break;
1433 case Kerberos:
1434#ifdef CONFIG_CIFS_UPCALL
1435 sess_data->func = sess_auth_kerberos;
1436 break;
1437#else
1438 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1439 return -ENOSYS;
1440 break;
1441#endif /* CONFIG_CIFS_UPCALL */
1442 case RawNTLMSSP:
1443 sess_data->func = sess_auth_rawntlmssp_negotiate;
1444 break;
1445 default:
1446 cifs_dbg(VFS, "secType %d not supported!\n", type);
1447 return -ENOSYS;
1448 }
1449
1450 return 0;
1451}
1452
1453int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1454 const struct nls_table *nls_cp)
1455{
1456 int rc = 0;
1457 struct sess_data *sess_data;
1458
1459 if (ses == NULL) {
1460 WARN(1, "%s: ses == NULL!", __func__);
1461 return -EINVAL;
1462 }
1463
1464 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1465 if (!sess_data)
1466 return -ENOMEM;
1467
1468 rc = select_sec(ses, sess_data);
1469 if (rc)
1470 goto out;
1471
1472 sess_data->xid = xid;
1473 sess_data->ses = ses;
1474 sess_data->buf0_type = CIFS_NO_BUFFER;
1475 sess_data->nls_cp = (struct nls_table *) nls_cp;
1476
1477 while (sess_data->func)
1478 sess_data->func(sess_data);
1479
1480 /* Store result before we free sess_data */
80a0e637 1481 rc = sess_data->result;
cc87c47d
SP		 1482
1483out:
80a0e637
SP		 1484 kfree(sess_data);
1485 return rc;
3979877e 1486}
Linux 6.x block layer and io_uring tree(s)