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[CIFS] Fix allocation of buffers for new session setup routine to allow
[net-next-2.6.git] / fs / cifs / sess.c
CommitLineData
3979877e
SF		 1/*
2 * fs/cifs/sess.c
3 *
4 * SMB/CIFS session setup handling routines
5 *
6 * Copyright (c) International Business Machines Corp., 2006
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>
3979877e 32
3979877e
SF		 33extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
34 unsigned char *p24);
35
3979877e
SF		 36static __u32 cifs_ssetup_hdr(struct cifsSesInfo *ses, SESSION_SETUP_ANDX *pSMB)
37{
38 __u32 capabilities = 0;
39
40 /* init fields common to all four types of SessSetup */
41 /* note that header is initialized to zero in header_assemble */
42 pSMB->req.AndXCommand = 0xFF;
43 pSMB->req.MaxBufferSize = cpu_to_le16(ses->server->maxBuf);
44 pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
45
46 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
47
48 /* BB verify whether signing required on neg or just on auth frame
49 (and NTLM case) */
50
51 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
52 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
53
54 if(ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
55 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
56
57 if (ses->capabilities & CAP_UNICODE) {
58 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
59 capabilities |= CAP_UNICODE;
60 }
61 if (ses->capabilities & CAP_STATUS32) {
62 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
63 capabilities |= CAP_STATUS32;
64 }
65 if (ses->capabilities & CAP_DFS) {
66 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
67 capabilities |= CAP_DFS;
68 }
69 if (ses->capabilities & CAP_UNIX) {
70 capabilities |= CAP_UNIX;
71 }
72
73 /* BB check whether to init vcnum BB */
74 return capabilities;
75}
76
7c7b25bc 77static void unicode_ssetup_strings(char ** pbcc_area, struct cifsSesInfo *ses,
3979877e
SF		 78 const struct nls_table * nls_cp)
79{
80 char * bcc_ptr = *pbcc_area;
81 int bytes_ret = 0;
82
83 /* BB FIXME add check that strings total less
84 than 335 or will need to send them as arrays */
85
86 /* align unicode strings, must be word aligned */
87 if ((long) bcc_ptr % 2) {
88 *bcc_ptr = 0;
89 bcc_ptr++;
90 }
91 /* copy user */
92 if(ses->userName == NULL) {
93 /* BB what about null user mounts - check that we do this BB */
94 } else { /* 300 should be long enough for any conceivable user name */
95 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->userName,
96 300, nls_cp);
97 }
98 bcc_ptr += 2 * bytes_ret;
99 bcc_ptr += 2; /* account for null termination */
100 /* copy domain */
101 if(ses->domainName == NULL)
102 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr,
103 "CIFS_LINUX_DOM", 32, nls_cp);
104 else
105 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->domainName,
106 256, nls_cp);
107 bcc_ptr += 2 * bytes_ret;
108 bcc_ptr += 2; /* account for null terminator */
109
110 /* Copy OS version */
111 bytes_ret = cifs_strtoUCS((__le16 *)bcc_ptr, "Linux version ", 32,
112 nls_cp);
113 bcc_ptr += 2 * bytes_ret;
114 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, system_utsname.release,
115 32, nls_cp);
116 bcc_ptr += 2 * bytes_ret;
117 bcc_ptr += 2; /* trailing null */
118
119 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
120 32, nls_cp);
121 bcc_ptr += 2 * bytes_ret;
122 bcc_ptr += 2; /* trailing null */
123
124 *pbcc_area = bcc_ptr;
125}
126
7c7b25bc 127static void ascii_ssetup_strings(char ** pbcc_area, struct cifsSesInfo *ses,
3979877e
SF		 128 const struct nls_table * nls_cp)
129{
130 char * bcc_ptr = *pbcc_area;
131
132 /* copy user */
133 /* BB what about null user mounts - check that we do this BB */
134 /* copy user */
135 if(ses->userName == NULL) {
136 /* BB what about null user mounts - check that we do this BB */
137 } else { /* 300 should be long enough for any conceivable user name */
138 strncpy(bcc_ptr, ses->userName, 300);
139 }
140 /* BB improve check for overflow */
750d1151 141 bcc_ptr += strnlen(ses->userName, 300);
3979877e
SF		 142 *bcc_ptr = 0;
143 bcc_ptr++; /* account for null termination */
144
145 /* copy domain */
146
147 if(ses->domainName == NULL) {
148 strcpy(bcc_ptr, "CIFS_LINUX_DOM");
149 bcc_ptr += 14; /* strlen(CIFS_LINUX_DOM) */
150 } else {
151 strncpy(bcc_ptr, ses->domainName, 256);
152 bcc_ptr += strnlen(ses->domainName, 256);
153 }
154 *bcc_ptr = 0;
155 bcc_ptr++;
156
157 /* BB check for overflow here */
158
159 strcpy(bcc_ptr, "Linux version ");
160 bcc_ptr += strlen("Linux version ");
161 strcpy(bcc_ptr, system_utsname.release);
162 bcc_ptr += strlen(system_utsname.release) + 1;
163
164 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
165 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
166
167 *pbcc_area = bcc_ptr;
168}
169
7c7b25bc 170static int decode_unicode_ssetup(char ** pbcc_area, int bleft, struct cifsSesInfo *ses,
3979877e
SF		 171 const struct nls_table * nls_cp)
172{
173 int rc = 0;
174 int words_left, len;
175 char * data = *pbcc_area;
176
177
178
179 cFYI(1,("bleft %d",bleft));
180
181
182 /* word align, if bytes remaining is not even */
183 if(bleft % 2) {
184 bleft--;
185 data++;
186 }
187 words_left = bleft / 2;
188
189 /* save off server operating system */
190 len = UniStrnlen((wchar_t *) data, words_left);
191
192/* We look for obvious messed up bcc or strings in response so we do not go off
193 the end since (at least) WIN2K and Windows XP have a major bug in not null
194 terminating last Unicode string in response */
195 if(len >= words_left)
196 return rc;
197
198 if(ses->serverOS)
199 kfree(ses->serverOS);
200 /* UTF-8 string will not grow more than four times as big as UCS-16 */
201 ses->serverOS = kzalloc(4 * len, GFP_KERNEL);
202 if(ses->serverOS != NULL) {
203 cifs_strfromUCS_le(ses->serverOS, (__le16 *)data, len,
204 nls_cp);
205 }
206 data += 2 * (len + 1);
207 words_left -= len + 1;
208
209 /* save off server network operating system */
210 len = UniStrnlen((wchar_t *) data, words_left);
211
212 if(len >= words_left)
213 return rc;
214
215 if(ses->serverNOS)
216 kfree(ses->serverNOS);
217 ses->serverNOS = kzalloc(4 * len, GFP_KERNEL); /* BB this is wrong length FIXME BB */
218 if(ses->serverNOS != NULL) {
219 cifs_strfromUCS_le(ses->serverNOS, (__le16 *)data, len,
220 nls_cp);
221 if(strncmp(ses->serverNOS, "NT LAN Manager 4",16) == 0) {
222 cFYI(1,("NT4 server"));
223 ses->flags |= CIFS_SES_NT4;
224 }
225 }
226 data += 2 * (len + 1);
227 words_left -= len + 1;
228
229 /* save off server domain */
230 len = UniStrnlen((wchar_t *) data, words_left);
231
232 if(len > words_left)
233 return rc;
234
235 if(ses->serverDomain)
236 kfree(ses->serverDomain);
237 ses->serverDomain = kzalloc(2 * (len + 1), GFP_KERNEL); /* BB FIXME wrong length */
238 if(ses->serverDomain != NULL) {
239 cifs_strfromUCS_le(ses->serverDomain, (__le16 *)data, len,
240 nls_cp);
241 ses->serverDomain[2*len] = 0;
242 ses->serverDomain[(2*len) + 1] = 0;
243 }
244 data += 2 * (len + 1);
245 words_left -= len + 1;
246
247 cFYI(1,("words left: %d",words_left));
248
249 return rc;
250}
251
7c7b25bc 252static int decode_ascii_ssetup(char ** pbcc_area, int bleft, struct cifsSesInfo *ses,
3979877e
SF		 253 const struct nls_table * nls_cp)
254{
255 int rc = 0;
256 int len;
257 char * bcc_ptr = *pbcc_area;
258
259 cFYI(1,("decode sessetup ascii. bleft %d", bleft));
260
261 len = strnlen(bcc_ptr, bleft);
262 if(len >= bleft)
263 return rc;
264
265 if(ses->serverOS)
266 kfree(ses->serverOS);
267
268 ses->serverOS = kzalloc(len + 1, GFP_KERNEL);
269 if(ses->serverOS)
270 strncpy(ses->serverOS, bcc_ptr, len);
271
272 bcc_ptr += len + 1;
273 bleft -= len + 1;
274
275 len = strnlen(bcc_ptr, bleft);
276 if(len >= bleft)
277 return rc;
278
279 if(ses->serverNOS)
280 kfree(ses->serverNOS);
281
282 ses->serverNOS = kzalloc(len + 1, GFP_KERNEL);
283 if(ses->serverNOS)
284 strncpy(ses->serverNOS, bcc_ptr, len);
285
286 bcc_ptr += len + 1;
287 bleft -= len + 1;
288
289 len = strnlen(bcc_ptr, bleft);
290 if(len > bleft)
291 return rc;
292
293 if(ses->serverDomain)
294 kfree(ses->serverDomain);
295
296 ses->serverDomain = kzalloc(len + 1, GFP_KERNEL);
297 if(ses->serverOS)
298 strncpy(ses->serverOS, bcc_ptr, len);
299
300 bcc_ptr += len + 1;
301 bleft -= len + 1;
302
303 cFYI(1,("ascii: bytes left %d",bleft));
304
305 return rc;
306}
307
308int
309CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
310 const struct nls_table *nls_cp)
311{
312 int rc = 0;
313 int wct;
3979877e
SF		 314 struct smb_hdr *smb_buf;
315 char *bcc_ptr;
750d1151 316 char *str_area;
3979877e
SF		 317 SESSION_SETUP_ANDX *pSMB;
318 __u32 capabilities;
319 int count;
320 int resp_buf_type = 0;
750d1151 321 struct kvec iov[2];
3979877e
SF		 322 enum securityEnum type;
323 __u16 action;
324 int bytes_remaining;
254e55ed
SF		 325
326 cFYI(1,("new sess setup"));
3979877e
SF		 327 if(ses == NULL)
328 return -EINVAL;
329
330 type = ses->server->secType;
331 if(type == LANMAN) {
332#ifndef CONFIG_CIFS_WEAK_PW_HASH
333 /* LANMAN and plaintext are less secure and off by default.
334 So we make this explicitly be turned on in kconfig (in the
335 build) and turned on at runtime (changed from the default)
336 in proc/fs/cifs or via mount parm. Unfortunately this is
337 needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
338 return -EOPNOTSUPP;
339#endif
340 wct = 10; /* lanman 2 style sessionsetup */
9312f675
SF		 341 } else if((type == NTLM) || (type == NTLMv2)) {
342 /* For NTLMv2 failures eventually may need to retry NTLM */
3979877e 343 wct = 13; /* old style NTLM sessionsetup */
9312f675 344 } else /* same size for negotiate or auth, NTLMSSP or extended security */
3979877e
SF		 345 wct = 12;
346
347 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
348 (void **)&smb_buf);
349 if(rc)
350 return rc;
351
352 pSMB = (SESSION_SETUP_ANDX *)smb_buf;
353
354 capabilities = cifs_ssetup_hdr(ses, pSMB);
750d1151
SF		 355
356 /* we will send the SMB in two pieces,
357 a fixed length beginning part, and a
358 second part which will include the strings
359 and rest of bcc area, in order to avoid having
360 to do a large buffer 17K allocation */
361 iov[0].iov_base = (char *)pSMB;
362 iov[0].iov_len = smb_buf->smb_buf_length + 4;
363
364 /* 2000 big enough to fit max user, domain, NOS name etc. */
365 str_area = kmalloc(2000, GFP_KERNEL);
366 bcc_ptr = str_area;
3979877e
SF		 367
368 if(type == LANMAN) {
369#ifdef CONFIG_CIFS_WEAK_PW_HASH
7c7b25bc 370 char lnm_session_key[CIFS_SESS_KEY_SIZE];
3979877e
SF		 371
372 /* no capabilities flags in old lanman negotiation */
373
7c7b25bc 374 pSMB->old_req.PasswordLength = CIFS_SESS_KEY_SIZE;
3979877e
SF		 375 /* BB calculate hash with password */
376 /* and copy into bcc */
377
7c7b25bc 378 calc_lanman_hash(ses, lnm_session_key);
3979877e 379
750d1151 380/* #ifdef CONFIG_CIFS_DEBUG2
3979877e 381 cifs_dump_mem("cryptkey: ",ses->server->cryptKey,
7c7b25bc 382 CIFS_SESS_KEY_SIZE);
750d1151 383#endif */
7c7b25bc
SF		 384 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_SESS_KEY_SIZE);
385 bcc_ptr += CIFS_SESS_KEY_SIZE;
3979877e
SF		 386
387 /* can not sign if LANMAN negotiated so no need
388 to calculate signing key? but what if server
389 changed to do higher than lanman dialect and
390 we reconnected would we ever calc signing_key? */
391
750d1151 392 cFYI(1,("Negotiating LANMAN setting up strings"));
3979877e
SF		 393 /* Unicode not allowed for LANMAN dialects */
394 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
395#endif
396 } else if (type == NTLM) {
7c7b25bc 397 char ntlm_session_key[CIFS_SESS_KEY_SIZE];
3979877e
SF		 398
399 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
400 pSMB->req_no_secext.CaseInsensitivePasswordLength =
7c7b25bc 401 cpu_to_le16(CIFS_SESS_KEY_SIZE);
3979877e 402 pSMB->req_no_secext.CaseSensitivePasswordLength =
7c7b25bc 403 cpu_to_le16(CIFS_SESS_KEY_SIZE);
3979877e
SF		 404
405 /* calculate session key */
406 SMBNTencrypt(ses->password, ses->server->cryptKey,
407 ntlm_session_key);
408
409 if(first_time) /* should this be moved into common code
410 with similar ntlmv2 path? */
750d1151 411 cifs_calculate_mac_key(ses->server->mac_signing_key,
3979877e
SF		 412 ntlm_session_key, ses->password);
413 /* copy session key */
414
7c7b25bc
SF		 415 memcpy(bcc_ptr, (char *)ntlm_session_key,CIFS_SESS_KEY_SIZE);
416 bcc_ptr += CIFS_SESS_KEY_SIZE;
417 memcpy(bcc_ptr, (char *)ntlm_session_key,CIFS_SESS_KEY_SIZE);
418 bcc_ptr += CIFS_SESS_KEY_SIZE;
419 if(ses->capabilities & CAP_UNICODE)
420 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
421 else
422 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
423 } else if (type == NTLMv2) {
6d027cfd
SF		 424 char * v2_sess_key =
425 kmalloc(sizeof(struct ntlmv2_resp), GFP_KERNEL);
f64b23ae
SF		 426
427 /* BB FIXME change all users of v2_sess_key to
428 struct ntlmv2_resp */
7c7b25bc
SF		 429
430 if(v2_sess_key == NULL) {
431 cifs_small_buf_release(smb_buf);
432 return -ENOMEM;
433 }
434
435 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
436
437 /* LM2 password would be here if we supported it */
438 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
439 /* cpu_to_le16(LM2_SESS_KEY_SIZE); */
440
441 pSMB->req_no_secext.CaseSensitivePasswordLength =
f64b23ae 442 cpu_to_le16(sizeof(struct ntlmv2_resp));
7c7b25bc
SF		 443
444 /* calculate session key */
1717ffc5 445 setup_ntlmv2_rsp(ses, v2_sess_key, nls_cp);
7c7b25bc
SF		 446 if(first_time) /* should this be moved into common code
447 with similar ntlmv2 path? */
448 /* cifs_calculate_ntlmv2_mac_key(ses->server->mac_signing_key,
449 response BB FIXME, v2_sess_key); */
450
451 /* copy session key */
452
453 /* memcpy(bcc_ptr, (char *)ntlm_session_key,LM2_SESS_KEY_SIZE);
454 bcc_ptr += LM2_SESS_KEY_SIZE; */
f64b23ae
SF		 455 memcpy(bcc_ptr, (char *)v2_sess_key, sizeof(struct ntlmv2_resp));
456 bcc_ptr += sizeof(struct ntlmv2_resp);
457 kfree(v2_sess_key);
3979877e
SF		 458 if(ses->capabilities & CAP_UNICODE)
459 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
460 else
461 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
462 } else /* NTLMSSP or SPNEGO */ {
463 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
464 capabilities |= CAP_EXTENDED_SECURITY;
465 pSMB->req.Capabilities = cpu_to_le32(capabilities);
466 /* BB set password lengths */
467 }
468
750d1151 469 count = (long) bcc_ptr - (long) str_area;
3979877e
SF		 470 smb_buf->smb_buf_length += count;
471
3979877e
SF		 472 BCC_LE(smb_buf) = cpu_to_le16(count);
473
750d1151
SF		 474 iov[1].iov_base = str_area;
475 iov[1].iov_len = count;
476 rc = SendReceive2(xid, ses, iov, 2 /* num_iovecs */, &resp_buf_type, 0);
3979877e
SF		 477 /* SMB request buf freed in SendReceive2 */
478
479 cFYI(1,("ssetup rc from sendrecv2 is %d",rc));
480 if(rc)
481 goto ssetup_exit;
482
483 pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base;
484 smb_buf = (struct smb_hdr *)iov[0].iov_base;
485
486 if((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) {
487 rc = -EIO;
488 cERROR(1,("bad word count %d", smb_buf->WordCount));
489 goto ssetup_exit;
490 }
491 action = le16_to_cpu(pSMB->resp.Action);
492 if (action & GUEST_LOGIN)
189acaae 493 cFYI(1, ("Guest login")); /* BB mark SesInfo struct? */
3979877e
SF		 494 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
495 cFYI(1, ("UID = %d ", ses->Suid));
496 /* response can have either 3 or 4 word count - Samba sends 3 */
497 /* and lanman response is 3 */
498 bytes_remaining = BCC(smb_buf);
499 bcc_ptr = pByteArea(smb_buf);
500
501 if(smb_buf->WordCount == 4) {
502 __u16 blob_len;
503 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
504 bcc_ptr += blob_len;
505 if(blob_len > bytes_remaining) {
506 cERROR(1,("bad security blob length %d", blob_len));
507 rc = -EINVAL;
508 goto ssetup_exit;
509 }
510 bytes_remaining -= blob_len;
511 }
512
513 /* BB check if Unicode and decode strings */
514 if(smb_buf->Flags2 & SMBFLG2_UNICODE)
515 rc = decode_unicode_ssetup(&bcc_ptr, bytes_remaining,
516 ses, nls_cp);
517 else
518 rc = decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,nls_cp);
519
520ssetup_exit:
750d1151 521 kfree(str_area);
3979877e
SF		 522 if(resp_buf_type == CIFS_SMALL_BUFFER) {
523 cFYI(1,("ssetup freeing small buf %p", iov[0].iov_base));
524 cifs_small_buf_release(iov[0].iov_base);
525 } else if(resp_buf_type == CIFS_LARGE_BUFFER)
526 cifs_buf_release(iov[0].iov_base);
527
528 return rc;
529}
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