ia64/linux-2.6.18-xen.hg

view fs/cifs/sess.c @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
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 */
24 #include "cifspdu.h"
25 #include "cifsglob.h"
26 #include "cifsproto.h"
27 #include "cifs_unicode.h"
28 #include "cifs_debug.h"
29 #include "ntlmssp.h"
30 #include "nterr.h"
31 #include <linux/utsname.h>
33 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
34 unsigned char *p24);
36 static __u32 cifs_ssetup_hdr(struct cifsSesInfo *ses, SESSION_SETUP_ANDX *pSMB)
37 {
38 __u32 capabilities = 0;
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);
46 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
48 /* BB verify whether signing required on neg or just on auth frame
49 (and NTLM case) */
51 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
52 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
54 if(ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
55 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
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 }
73 /* BB check whether to init vcnum BB */
74 return capabilities;
75 }
77 static void unicode_ssetup_strings(char ** pbcc_area, struct cifsSesInfo *ses,
78 const struct nls_table * nls_cp)
79 {
80 char * bcc_ptr = *pbcc_area;
81 int bytes_ret = 0;
83 /* BB FIXME add check that strings total less
84 than 335 or will need to send them as arrays */
86 /* unicode strings, must be word aligned before the call */
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 */
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 */
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 */
124 *pbcc_area = bcc_ptr;
125 }
127 static void ascii_ssetup_strings(char ** pbcc_area, struct cifsSesInfo *ses,
128 const struct nls_table * nls_cp)
129 {
130 char * bcc_ptr = *pbcc_area;
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 */
141 bcc_ptr += strnlen(ses->userName, 300);
142 *bcc_ptr = 0;
143 bcc_ptr++; /* account for null termination */
145 /* copy domain */
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++;
157 /* BB check for overflow here */
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;
164 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
165 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
167 *pbcc_area = bcc_ptr;
168 }
170 static int decode_unicode_ssetup(char ** pbcc_area, int bleft, struct cifsSesInfo *ses,
171 const struct nls_table * nls_cp)
172 {
173 int rc = 0;
174 int words_left, len;
175 char * data = *pbcc_area;
179 cFYI(1,("bleft %d",bleft));
182 /* word align, if bytes remaining is not even */
183 if(bleft % 2) {
184 bleft--;
185 data++;
186 }
187 words_left = bleft / 2;
189 /* save off server operating system */
190 len = UniStrnlen((wchar_t *) data, words_left);
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;
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;
209 /* save off server network operating system */
210 len = UniStrnlen((wchar_t *) data, words_left);
212 if(len >= words_left)
213 return rc;
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;
229 /* save off server domain */
230 len = UniStrnlen((wchar_t *) data, words_left);
232 if(len > words_left)
233 return rc;
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;
247 cFYI(1,("words left: %d",words_left));
249 return rc;
250 }
252 static int decode_ascii_ssetup(char ** pbcc_area, int bleft, struct cifsSesInfo *ses,
253 const struct nls_table * nls_cp)
254 {
255 int rc = 0;
256 int len;
257 char * bcc_ptr = *pbcc_area;
259 cFYI(1,("decode sessetup ascii. bleft %d", bleft));
261 len = strnlen(bcc_ptr, bleft);
262 if(len >= bleft)
263 return rc;
265 if(ses->serverOS)
266 kfree(ses->serverOS);
268 ses->serverOS = kzalloc(len + 1, GFP_KERNEL);
269 if(ses->serverOS)
270 strncpy(ses->serverOS, bcc_ptr, len);
272 bcc_ptr += len + 1;
273 bleft -= len + 1;
275 len = strnlen(bcc_ptr, bleft);
276 if(len >= bleft)
277 return rc;
279 if(ses->serverNOS)
280 kfree(ses->serverNOS);
282 ses->serverNOS = kzalloc(len + 1, GFP_KERNEL);
283 if(ses->serverNOS)
284 strncpy(ses->serverNOS, bcc_ptr, len);
286 bcc_ptr += len + 1;
287 bleft -= len + 1;
289 len = strnlen(bcc_ptr, bleft);
290 if(len > bleft)
291 return rc;
293 if(ses->serverDomain)
294 kfree(ses->serverDomain);
296 ses->serverDomain = kzalloc(len + 1, GFP_KERNEL);
297 if(ses->serverOS)
298 strncpy(ses->serverOS, bcc_ptr, len);
300 bcc_ptr += len + 1;
301 bleft -= len + 1;
303 cFYI(1,("ascii: bytes left %d",bleft));
305 return rc;
306 }
308 int
309 CIFS_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;
314 struct smb_hdr *smb_buf;
315 char *bcc_ptr;
316 char *str_area;
317 SESSION_SETUP_ANDX *pSMB;
318 __u32 capabilities;
319 int count;
320 int resp_buf_type = 0;
321 struct kvec iov[2];
322 enum securityEnum type;
323 __u16 action;
324 int bytes_remaining;
326 if(ses == NULL)
327 return -EINVAL;
329 type = ses->server->secType;
331 cFYI(1,("sess setup type %d",type));
332 if(type == LANMAN) {
333 #ifndef CONFIG_CIFS_WEAK_PW_HASH
334 /* LANMAN and plaintext are less secure and off by default.
335 So we make this explicitly be turned on in kconfig (in the
336 build) and turned on at runtime (changed from the default)
337 in proc/fs/cifs or via mount parm. Unfortunately this is
338 needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
339 return -EOPNOTSUPP;
340 #endif
341 wct = 10; /* lanman 2 style sessionsetup */
342 } else if((type == NTLM) || (type == NTLMv2)) {
343 /* For NTLMv2 failures eventually may need to retry NTLM */
344 wct = 13; /* old style NTLM sessionsetup */
345 } else /* same size for negotiate or auth, NTLMSSP or extended security */
346 wct = 12;
348 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
349 (void **)&smb_buf);
350 if(rc)
351 return rc;
353 pSMB = (SESSION_SETUP_ANDX *)smb_buf;
355 capabilities = cifs_ssetup_hdr(ses, pSMB);
357 /* we will send the SMB in two pieces,
358 a fixed length beginning part, and a
359 second part which will include the strings
360 and rest of bcc area, in order to avoid having
361 to do a large buffer 17K allocation */
362 iov[0].iov_base = (char *)pSMB;
363 iov[0].iov_len = smb_buf->smb_buf_length + 4;
365 /* 2000 big enough to fit max user, domain, NOS name etc. */
366 str_area = kmalloc(2000, GFP_KERNEL);
367 bcc_ptr = str_area;
369 if(type == LANMAN) {
370 #ifdef CONFIG_CIFS_WEAK_PW_HASH
371 char lnm_session_key[CIFS_SESS_KEY_SIZE];
373 /* no capabilities flags in old lanman negotiation */
375 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
376 /* BB calculate hash with password */
377 /* and copy into bcc */
379 calc_lanman_hash(ses, lnm_session_key);
381 /* #ifdef CONFIG_CIFS_DEBUG2
382 cifs_dump_mem("cryptkey: ",ses->server->cryptKey,
383 CIFS_SESS_KEY_SIZE);
384 #endif */
385 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_SESS_KEY_SIZE);
386 bcc_ptr += CIFS_SESS_KEY_SIZE;
388 /* can not sign if LANMAN negotiated so no need
389 to calculate signing key? but what if server
390 changed to do higher than lanman dialect and
391 we reconnected would we ever calc signing_key? */
393 cFYI(1,("Negotiating LANMAN setting up strings"));
394 /* Unicode not allowed for LANMAN dialects */
395 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
396 #endif
397 } else if (type == NTLM) {
398 char ntlm_session_key[CIFS_SESS_KEY_SIZE];
400 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
401 pSMB->req_no_secext.CaseInsensitivePasswordLength =
402 cpu_to_le16(CIFS_SESS_KEY_SIZE);
403 pSMB->req_no_secext.CaseSensitivePasswordLength =
404 cpu_to_le16(CIFS_SESS_KEY_SIZE);
406 /* calculate session key */
407 SMBNTencrypt(ses->password, ses->server->cryptKey,
408 ntlm_session_key);
410 if(first_time) /* should this be moved into common code
411 with similar ntlmv2 path? */
412 cifs_calculate_mac_key(ses->server->mac_signing_key,
413 ntlm_session_key, ses->password);
414 /* copy session key */
416 memcpy(bcc_ptr, (char *)ntlm_session_key,CIFS_SESS_KEY_SIZE);
417 bcc_ptr += CIFS_SESS_KEY_SIZE;
418 memcpy(bcc_ptr, (char *)ntlm_session_key,CIFS_SESS_KEY_SIZE);
419 bcc_ptr += CIFS_SESS_KEY_SIZE;
420 if(ses->capabilities & CAP_UNICODE) {
421 /* unicode strings must be word aligned */
422 if (iov[0].iov_len % 2) {
423 *bcc_ptr = 0;
424 bcc_ptr++;
425 }
426 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
427 } else
428 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
429 } else if (type == NTLMv2) {
430 char * v2_sess_key =
431 kmalloc(sizeof(struct ntlmv2_resp), GFP_KERNEL);
433 /* BB FIXME change all users of v2_sess_key to
434 struct ntlmv2_resp */
436 if(v2_sess_key == NULL) {
437 cifs_small_buf_release(smb_buf);
438 return -ENOMEM;
439 }
441 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
443 /* LM2 password would be here if we supported it */
444 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
445 /* cpu_to_le16(LM2_SESS_KEY_SIZE); */
447 pSMB->req_no_secext.CaseSensitivePasswordLength =
448 cpu_to_le16(sizeof(struct ntlmv2_resp));
450 /* calculate session key */
451 setup_ntlmv2_rsp(ses, v2_sess_key, nls_cp);
452 if(first_time) /* should this be moved into common code
453 with similar ntlmv2 path? */
454 /* cifs_calculate_ntlmv2_mac_key(ses->server->mac_signing_key,
455 response BB FIXME, v2_sess_key); */
457 /* copy session key */
459 /* memcpy(bcc_ptr, (char *)ntlm_session_key,LM2_SESS_KEY_SIZE);
460 bcc_ptr += LM2_SESS_KEY_SIZE; */
461 memcpy(bcc_ptr, (char *)v2_sess_key, sizeof(struct ntlmv2_resp));
462 bcc_ptr += sizeof(struct ntlmv2_resp);
463 kfree(v2_sess_key);
464 if(ses->capabilities & CAP_UNICODE) {
465 if(iov[0].iov_len % 2) {
466 *bcc_ptr = 0;
467 } bcc_ptr++;
468 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
469 } else
470 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
471 } else /* NTLMSSP or SPNEGO */ {
472 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
473 capabilities |= CAP_EXTENDED_SECURITY;
474 pSMB->req.Capabilities = cpu_to_le32(capabilities);
475 /* BB set password lengths */
476 }
478 count = (long) bcc_ptr - (long) str_area;
479 smb_buf->smb_buf_length += count;
481 BCC_LE(smb_buf) = cpu_to_le16(count);
483 iov[1].iov_base = str_area;
484 iov[1].iov_len = count;
485 rc = SendReceive2(xid, ses, iov, 2 /* num_iovecs */, &resp_buf_type, 0);
486 /* SMB request buf freed in SendReceive2 */
488 cFYI(1,("ssetup rc from sendrecv2 is %d",rc));
489 if(rc)
490 goto ssetup_exit;
492 pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base;
493 smb_buf = (struct smb_hdr *)iov[0].iov_base;
495 if((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) {
496 rc = -EIO;
497 cERROR(1,("bad word count %d", smb_buf->WordCount));
498 goto ssetup_exit;
499 }
500 action = le16_to_cpu(pSMB->resp.Action);
501 if (action & GUEST_LOGIN)
502 cFYI(1, ("Guest login")); /* BB mark SesInfo struct? */
503 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
504 cFYI(1, ("UID = %d ", ses->Suid));
505 /* response can have either 3 or 4 word count - Samba sends 3 */
506 /* and lanman response is 3 */
507 bytes_remaining = BCC(smb_buf);
508 bcc_ptr = pByteArea(smb_buf);
510 if(smb_buf->WordCount == 4) {
511 __u16 blob_len;
512 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
513 bcc_ptr += blob_len;
514 if(blob_len > bytes_remaining) {
515 cERROR(1,("bad security blob length %d", blob_len));
516 rc = -EINVAL;
517 goto ssetup_exit;
518 }
519 bytes_remaining -= blob_len;
520 }
522 /* BB check if Unicode and decode strings */
523 if(smb_buf->Flags2 & SMBFLG2_UNICODE)
524 rc = decode_unicode_ssetup(&bcc_ptr, bytes_remaining,
525 ses, nls_cp);
526 else
527 rc = decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,nls_cp);
529 ssetup_exit:
530 kfree(str_area);
531 if(resp_buf_type == CIFS_SMALL_BUFFER) {
532 cFYI(1,("ssetup freeing small buf %p", iov[0].iov_base));
533 cifs_small_buf_release(iov[0].iov_base);
534 } else if(resp_buf_type == CIFS_LARGE_BUFFER)
535 cifs_buf_release(iov[0].iov_base);
537 return rc;
538 }