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1 | /* |
2 | * fs/cifs/sess.c |
3 | * |
4 | * SMB/CIFS session setup handling routines |
5 | * |
6 | * Copyright (c) International Business Machines Corp., 2006, 2009 |
7 | * Author(s): Steve French (sfrench@us.ibm.com) |
8 | * |
9 | * This library is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU Lesser General Public License as published |
11 | * by the Free Software Foundation; either version 2.1 of the License, or |
12 | * (at your option) any later version. |
13 | * |
14 | * This library is distributed in the hope that it will be useful, |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
17 | * the GNU Lesser General Public License for more details. |
18 | * |
19 | * You should have received a copy of the GNU Lesser General Public License |
20 | * along with this library; if not, write to the Free Software |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
22 | */ |
23 | |
24 | #include "cifspdu.h" |
25 | #include "cifsglob.h" |
26 | #include "cifsproto.h" |
27 | #include "cifs_unicode.h" |
28 | #include "cifs_debug.h" |
29 | #include "ntlmssp.h" |
30 | #include "nterr.h" |
31 | #include <linux/utsname.h> |
32 | #include "cifs_spnego.h" |
33 | |
34 | extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8, |
35 | unsigned char *p24); |
36 | |
37 | /* Checks if this is the first smb session to be reconnected after |
38 | the socket has been reestablished (so we know whether to use vc 0). |
39 | Called while holding the cifs_tcp_ses_lock, so do not block */ |
40 | static bool is_first_ses_reconnect(struct cifsSesInfo *ses) |
41 | { |
42 | struct list_head *tmp; |
43 | struct cifsSesInfo *tmp_ses; |
44 | |
45 | list_for_each(tmp, &ses->server->smb_ses_list) { |
46 | tmp_ses = list_entry(tmp, struct cifsSesInfo, |
47 | smb_ses_list); |
48 | if (tmp_ses->need_reconnect == false) |
49 | return false; |
50 | } |
51 | /* could not find a session that was already connected, |
52 | this must be the first one we are reconnecting */ |
53 | return true; |
54 | } |
55 | |
56 | /* |
57 | * vc number 0 is treated specially by some servers, and should be the |
58 | * first one we request. After that we can use vcnumbers up to maxvcs, |
59 | * one for each smb session (some Windows versions set maxvcs incorrectly |
60 | * so maxvc=1 can be ignored). If we have too many vcs, we can reuse |
61 | * any vc but zero (some servers reset the connection on vcnum zero) |
62 | * |
63 | */ |
64 | static __le16 get_next_vcnum(struct cifsSesInfo *ses) |
65 | { |
66 | __u16 vcnum = 0; |
67 | struct list_head *tmp; |
68 | struct cifsSesInfo *tmp_ses; |
69 | __u16 max_vcs = ses->server->max_vcs; |
70 | __u16 i; |
71 | int free_vc_found = 0; |
72 | |
73 | /* Quoting the MS-SMB specification: "Windows-based SMB servers set this |
74 | field to one but do not enforce this limit, which allows an SMB client |
75 | to establish more virtual circuits than allowed by this value ... but |
76 | other server implementations can enforce this limit." */ |
77 | if (max_vcs < 2) |
78 | max_vcs = 0xFFFF; |
79 | |
80 | write_lock(&cifs_tcp_ses_lock); |
81 | if ((ses->need_reconnect) && is_first_ses_reconnect(ses)) |
82 | goto get_vc_num_exit; /* vcnum will be zero */ |
83 | for (i = ses->server->srv_count - 1; i < max_vcs; i++) { |
84 | if (i == 0) /* this is the only connection, use vc 0 */ |
85 | break; |
86 | |
87 | free_vc_found = 1; |
88 | |
89 | list_for_each(tmp, &ses->server->smb_ses_list) { |
90 | tmp_ses = list_entry(tmp, struct cifsSesInfo, |
91 | smb_ses_list); |
92 | if (tmp_ses->vcnum == i) { |
93 | free_vc_found = 0; |
94 | break; /* found duplicate, try next vcnum */ |
95 | } |
96 | } |
97 | if (free_vc_found) |
98 | break; /* we found a vcnumber that will work - use it */ |
99 | } |
100 | |
101 | if (i == 0) |
102 | vcnum = 0; /* for most common case, ie if one smb session, use |
103 | vc zero. Also for case when no free vcnum, zero |
104 | is safest to send (some clients only send zero) */ |
105 | else if (free_vc_found == 0) |
106 | vcnum = 1; /* we can not reuse vc=0 safely, since some servers |
107 | reset all uids on that, but 1 is ok. */ |
108 | else |
109 | vcnum = i; |
110 | ses->vcnum = vcnum; |
111 | get_vc_num_exit: |
112 | write_unlock(&cifs_tcp_ses_lock); |
113 | |
114 | return cpu_to_le16(vcnum); |
115 | } |
116 | |
117 | static __u32 cifs_ssetup_hdr(struct cifsSesInfo *ses, SESSION_SETUP_ANDX *pSMB) |
118 | { |
119 | __u32 capabilities = 0; |
120 | |
121 | /* init fields common to all four types of SessSetup */ |
122 | /* Note that offsets for first seven fields in req struct are same */ |
123 | /* in CIFS Specs so does not matter which of 3 forms of struct */ |
124 | /* that we use in next few lines */ |
125 | /* Note that header is initialized to zero in header_assemble */ |
126 | pSMB->req.AndXCommand = 0xFF; |
127 | pSMB->req.MaxBufferSize = cpu_to_le16(ses->server->maxBuf); |
128 | pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq); |
129 | pSMB->req.VcNumber = get_next_vcnum(ses); |
130 | |
131 | /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */ |
132 | |
133 | /* BB verify whether signing required on neg or just on auth frame |
134 | (and NTLM case) */ |
135 | |
136 | capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS | |
137 | CAP_LARGE_WRITE_X | CAP_LARGE_READ_X; |
138 | |
139 | if (ses->server->secMode & |
140 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
141 | pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
142 | |
143 | if (ses->capabilities & CAP_UNICODE) { |
144 | pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE; |
145 | capabilities |= CAP_UNICODE; |
146 | } |
147 | if (ses->capabilities & CAP_STATUS32) { |
148 | pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS; |
149 | capabilities |= CAP_STATUS32; |
150 | } |
151 | if (ses->capabilities & CAP_DFS) { |
152 | pSMB->req.hdr.Flags2 |= SMBFLG2_DFS; |
153 | capabilities |= CAP_DFS; |
154 | } |
155 | if (ses->capabilities & CAP_UNIX) |
156 | capabilities |= CAP_UNIX; |
157 | |
158 | return capabilities; |
159 | } |
160 | |
161 | static void |
162 | unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp) |
163 | { |
164 | char *bcc_ptr = *pbcc_area; |
165 | int bytes_ret = 0; |
166 | |
167 | /* Copy OS version */ |
168 | bytes_ret = cifs_strtoUCS((__le16 *)bcc_ptr, "Linux version ", 32, |
169 | nls_cp); |
170 | bcc_ptr += 2 * bytes_ret; |
171 | bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, init_utsname()->release, |
172 | 32, nls_cp); |
173 | bcc_ptr += 2 * bytes_ret; |
174 | bcc_ptr += 2; /* trailing null */ |
175 | |
176 | bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS, |
177 | 32, nls_cp); |
178 | bcc_ptr += 2 * bytes_ret; |
179 | bcc_ptr += 2; /* trailing null */ |
180 | |
181 | *pbcc_area = bcc_ptr; |
182 | } |
183 | |
184 | static void unicode_domain_string(char **pbcc_area, struct cifsSesInfo *ses, |
185 | const struct nls_table *nls_cp) |
186 | { |
187 | char *bcc_ptr = *pbcc_area; |
188 | int bytes_ret = 0; |
189 | |
190 | /* copy domain */ |
191 | if (ses->domainName == NULL) { |
192 | /* Sending null domain better than using a bogus domain name (as |
193 | we did briefly in 2.6.18) since server will use its default */ |
194 | *bcc_ptr = 0; |
195 | *(bcc_ptr+1) = 0; |
196 | bytes_ret = 0; |
197 | } else |
198 | bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->domainName, |
199 | 256, nls_cp); |
200 | bcc_ptr += 2 * bytes_ret; |
201 | bcc_ptr += 2; /* account for null terminator */ |
202 | |
203 | *pbcc_area = bcc_ptr; |
204 | } |
205 | |
206 | |
207 | static void unicode_ssetup_strings(char **pbcc_area, struct cifsSesInfo *ses, |
208 | const struct nls_table *nls_cp) |
209 | { |
210 | char *bcc_ptr = *pbcc_area; |
211 | int bytes_ret = 0; |
212 | |
213 | /* BB FIXME add check that strings total less |
214 | than 335 or will need to send them as arrays */ |
215 | |
216 | /* unicode strings, must be word aligned before the call */ |
217 | /* if ((long) bcc_ptr % 2) { |
218 | *bcc_ptr = 0; |
219 | bcc_ptr++; |
220 | } */ |
221 | /* copy user */ |
222 | if (ses->userName == NULL) { |
223 | /* null user mount */ |
224 | *bcc_ptr = 0; |
225 | *(bcc_ptr+1) = 0; |
226 | } else { /* 300 should be long enough for any conceivable user name */ |
227 | bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->userName, |
228 | 300, nls_cp); |
229 | } |
230 | bcc_ptr += 2 * bytes_ret; |
231 | bcc_ptr += 2; /* account for null termination */ |
232 | |
233 | unicode_domain_string(&bcc_ptr, ses, nls_cp); |
234 | unicode_oslm_strings(&bcc_ptr, nls_cp); |
235 | |
236 | *pbcc_area = bcc_ptr; |
237 | } |
238 | |
239 | static void ascii_ssetup_strings(char **pbcc_area, struct cifsSesInfo *ses, |
240 | const struct nls_table *nls_cp) |
241 | { |
242 | char *bcc_ptr = *pbcc_area; |
243 | |
244 | /* copy user */ |
245 | /* BB what about null user mounts - check that we do this BB */ |
246 | /* copy user */ |
247 | if (ses->userName == NULL) { |
248 | /* BB what about null user mounts - check that we do this BB */ |
249 | } else { /* 300 should be long enough for any conceivable user name */ |
250 | strncpy(bcc_ptr, ses->userName, 300); |
251 | } |
252 | /* BB improve check for overflow */ |
253 | bcc_ptr += strnlen(ses->userName, 300); |
254 | *bcc_ptr = 0; |
255 | bcc_ptr++; /* account for null termination */ |
256 | |
257 | /* copy domain */ |
258 | |
259 | if (ses->domainName != NULL) { |
260 | strncpy(bcc_ptr, ses->domainName, 256); |
261 | bcc_ptr += strnlen(ses->domainName, 256); |
262 | } /* else we will send a null domain name |
263 | so the server will default to its own domain */ |
264 | *bcc_ptr = 0; |
265 | bcc_ptr++; |
266 | |
267 | /* BB check for overflow here */ |
268 | |
269 | strcpy(bcc_ptr, "Linux version "); |
270 | bcc_ptr += strlen("Linux version "); |
271 | strcpy(bcc_ptr, init_utsname()->release); |
272 | bcc_ptr += strlen(init_utsname()->release) + 1; |
273 | |
274 | strcpy(bcc_ptr, CIFS_NETWORK_OPSYS); |
275 | bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1; |
276 | |
277 | *pbcc_area = bcc_ptr; |
278 | } |
279 | |
280 | static void |
281 | decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifsSesInfo *ses, |
282 | const struct nls_table *nls_cp) |
283 | { |
284 | int len; |
285 | char *data = *pbcc_area; |
286 | |
287 | cFYI(1, ("bleft %d", bleft)); |
288 | |
289 | /* |
290 | * Windows servers do not always double null terminate their final |
291 | * Unicode string. Check to see if there are an uneven number of bytes |
292 | * left. If so, then add an extra NULL pad byte to the end of the |
293 | * response. |
294 | * |
295 | * See section 2.7.2 in "Implementing CIFS" for details |
296 | */ |
297 | if (bleft % 2) { |
298 | data[bleft] = 0; |
299 | ++bleft; |
300 | } |
301 | |
302 | kfree(ses->serverOS); |
303 | ses->serverOS = cifs_strndup_from_ucs(data, bleft, true, nls_cp); |
304 | cFYI(1, ("serverOS=%s", ses->serverOS)); |
305 | len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; |
306 | data += len; |
307 | bleft -= len; |
308 | if (bleft <= 0) |
309 | return; |
310 | |
311 | kfree(ses->serverNOS); |
312 | ses->serverNOS = cifs_strndup_from_ucs(data, bleft, true, nls_cp); |
313 | cFYI(1, ("serverNOS=%s", ses->serverNOS)); |
314 | len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; |
315 | data += len; |
316 | bleft -= len; |
317 | if (bleft <= 0) |
318 | return; |
319 | |
320 | kfree(ses->serverDomain); |
321 | ses->serverDomain = cifs_strndup_from_ucs(data, bleft, true, nls_cp); |
322 | cFYI(1, ("serverDomain=%s", ses->serverDomain)); |
323 | |
324 | return; |
325 | } |
326 | |
327 | static int decode_ascii_ssetup(char **pbcc_area, int bleft, |
328 | struct cifsSesInfo *ses, |
329 | const struct nls_table *nls_cp) |
330 | { |
331 | int rc = 0; |
332 | int len; |
333 | char *bcc_ptr = *pbcc_area; |
334 | |
335 | cFYI(1, ("decode sessetup ascii. bleft %d", bleft)); |
336 | |
337 | len = strnlen(bcc_ptr, bleft); |
338 | if (len >= bleft) |
339 | return rc; |
340 | |
341 | kfree(ses->serverOS); |
342 | |
343 | ses->serverOS = kzalloc(len + 1, GFP_KERNEL); |
344 | if (ses->serverOS) |
345 | strncpy(ses->serverOS, bcc_ptr, len); |
346 | if (strncmp(ses->serverOS, "OS/2", 4) == 0) { |
347 | cFYI(1, ("OS/2 server")); |
348 | ses->flags |= CIFS_SES_OS2; |
349 | } |
350 | |
351 | bcc_ptr += len + 1; |
352 | bleft -= len + 1; |
353 | |
354 | len = strnlen(bcc_ptr, bleft); |
355 | if (len >= bleft) |
356 | return rc; |
357 | |
358 | kfree(ses->serverNOS); |
359 | |
360 | ses->serverNOS = kzalloc(len + 1, GFP_KERNEL); |
361 | if (ses->serverNOS) |
362 | strncpy(ses->serverNOS, bcc_ptr, len); |
363 | |
364 | bcc_ptr += len + 1; |
365 | bleft -= len + 1; |
366 | |
367 | len = strnlen(bcc_ptr, bleft); |
368 | if (len > bleft) |
369 | return rc; |
370 | |
371 | /* No domain field in LANMAN case. Domain is |
372 | returned by old servers in the SMB negprot response */ |
373 | /* BB For newer servers which do not support Unicode, |
374 | but thus do return domain here we could add parsing |
375 | for it later, but it is not very important */ |
376 | cFYI(1, ("ascii: bytes left %d", bleft)); |
377 | |
378 | return rc; |
379 | } |
380 | |
381 | static int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len, |
382 | struct cifsSesInfo *ses) |
383 | { |
384 | CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr; |
385 | |
386 | if (blob_len < sizeof(CHALLENGE_MESSAGE)) { |
387 | cERROR(1, ("challenge blob len %d too small", blob_len)); |
388 | return -EINVAL; |
389 | } |
390 | |
391 | if (memcmp(pblob->Signature, "NTLMSSP", 8)) { |
392 | cERROR(1, ("blob signature incorrect %s", pblob->Signature)); |
393 | return -EINVAL; |
394 | } |
395 | if (pblob->MessageType != NtLmChallenge) { |
396 | cERROR(1, ("Incorrect message type %d", pblob->MessageType)); |
397 | return -EINVAL; |
398 | } |
399 | |
400 | memcpy(ses->server->cryptKey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE); |
401 | /* BB we could decode pblob->NegotiateFlags; some may be useful */ |
402 | /* In particular we can examine sign flags */ |
403 | /* BB spec says that if AvId field of MsvAvTimestamp is populated then |
404 | we must set the MIC field of the AUTHENTICATE_MESSAGE */ |
405 | |
406 | return 0; |
407 | } |
408 | |
409 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
410 | /* BB Move to ntlmssp.c eventually */ |
411 | |
412 | /* We do not malloc the blob, it is passed in pbuffer, because |
413 | it is fixed size, and small, making this approach cleaner */ |
414 | static void build_ntlmssp_negotiate_blob(unsigned char *pbuffer, |
415 | struct cifsSesInfo *ses) |
416 | { |
417 | NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer; |
418 | __u32 flags; |
419 | |
420 | memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); |
421 | sec_blob->MessageType = NtLmNegotiate; |
422 | |
423 | /* BB is NTLMV2 session security format easier to use here? */ |
424 | flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET | |
425 | NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | |
426 | NTLMSSP_NEGOTIATE_NT_ONLY | NTLMSSP_NEGOTIATE_NTLM; |
427 | if (ses->server->secMode & |
428 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
429 | flags |= NTLMSSP_NEGOTIATE_SIGN; |
430 | if (ses->server->secMode & SECMODE_SIGN_REQUIRED) |
431 | flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN; |
432 | |
433 | sec_blob->NegotiateFlags |= cpu_to_le32(flags); |
434 | |
435 | sec_blob->WorkstationName.BufferOffset = 0; |
436 | sec_blob->WorkstationName.Length = 0; |
437 | sec_blob->WorkstationName.MaximumLength = 0; |
438 | |
439 | /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */ |
440 | sec_blob->DomainName.BufferOffset = 0; |
441 | sec_blob->DomainName.Length = 0; |
442 | sec_blob->DomainName.MaximumLength = 0; |
443 | } |
444 | |
445 | /* We do not malloc the blob, it is passed in pbuffer, because its |
446 | maximum possible size is fixed and small, making this approach cleaner. |
447 | This function returns the length of the data in the blob */ |
448 | static int build_ntlmssp_auth_blob(unsigned char *pbuffer, |
449 | struct cifsSesInfo *ses, |
450 | const struct nls_table *nls_cp, int first) |
451 | { |
452 | AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer; |
453 | __u32 flags; |
454 | unsigned char *tmp; |
455 | char ntlm_session_key[CIFS_SESS_KEY_SIZE]; |
456 | |
457 | memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); |
458 | sec_blob->MessageType = NtLmAuthenticate; |
459 | |
460 | flags = NTLMSSP_NEGOTIATE_56 | |
461 | NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO | |
462 | NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | |
463 | NTLMSSP_NEGOTIATE_NT_ONLY | NTLMSSP_NEGOTIATE_NTLM; |
464 | if (ses->server->secMode & |
465 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
466 | flags |= NTLMSSP_NEGOTIATE_SIGN; |
467 | if (ses->server->secMode & SECMODE_SIGN_REQUIRED) |
468 | flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN; |
469 | |
470 | tmp = pbuffer + sizeof(AUTHENTICATE_MESSAGE); |
471 | sec_blob->NegotiateFlags |= cpu_to_le32(flags); |
472 | |
473 | sec_blob->LmChallengeResponse.BufferOffset = |
474 | cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE)); |
475 | sec_blob->LmChallengeResponse.Length = 0; |
476 | sec_blob->LmChallengeResponse.MaximumLength = 0; |
477 | |
478 | /* calculate session key, BB what about adding similar ntlmv2 path? */ |
479 | SMBNTencrypt(ses->password, ses->server->cryptKey, ntlm_session_key); |
480 | if (first) |
481 | cifs_calculate_mac_key(&ses->server->mac_signing_key, |
482 | ntlm_session_key, ses->password); |
483 | |
484 | memcpy(tmp, ntlm_session_key, CIFS_SESS_KEY_SIZE); |
485 | sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer); |
486 | sec_blob->NtChallengeResponse.Length = cpu_to_le16(CIFS_SESS_KEY_SIZE); |
487 | sec_blob->NtChallengeResponse.MaximumLength = |
488 | cpu_to_le16(CIFS_SESS_KEY_SIZE); |
489 | |
490 | tmp += CIFS_SESS_KEY_SIZE; |
491 | |
492 | if (ses->domainName == NULL) { |
493 | sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer); |
494 | sec_blob->DomainName.Length = 0; |
495 | sec_blob->DomainName.MaximumLength = 0; |
496 | tmp += 2; |
497 | } else { |
498 | int len; |
499 | len = cifs_strtoUCS((__le16 *)tmp, ses->domainName, |
500 | MAX_USERNAME_SIZE, nls_cp); |
501 | len *= 2; /* unicode is 2 bytes each */ |
502 | len += 2; /* trailing null */ |
503 | sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer); |
504 | sec_blob->DomainName.Length = cpu_to_le16(len); |
505 | sec_blob->DomainName.MaximumLength = cpu_to_le16(len); |
506 | tmp += len; |
507 | } |
508 | |
509 | if (ses->userName == NULL) { |
510 | sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer); |
511 | sec_blob->UserName.Length = 0; |
512 | sec_blob->UserName.MaximumLength = 0; |
513 | tmp += 2; |
514 | } else { |
515 | int len; |
516 | len = cifs_strtoUCS((__le16 *)tmp, ses->userName, |
517 | MAX_USERNAME_SIZE, nls_cp); |
518 | len *= 2; /* unicode is 2 bytes each */ |
519 | len += 2; /* trailing null */ |
520 | sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer); |
521 | sec_blob->UserName.Length = cpu_to_le16(len); |
522 | sec_blob->UserName.MaximumLength = cpu_to_le16(len); |
523 | tmp += len; |
524 | } |
525 | |
526 | sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - pbuffer); |
527 | sec_blob->WorkstationName.Length = 0; |
528 | sec_blob->WorkstationName.MaximumLength = 0; |
529 | tmp += 2; |
530 | |
531 | sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer); |
532 | sec_blob->SessionKey.Length = 0; |
533 | sec_blob->SessionKey.MaximumLength = 0; |
534 | return tmp - pbuffer; |
535 | } |
536 | |
537 | |
538 | static void setup_ntlmssp_neg_req(SESSION_SETUP_ANDX *pSMB, |
539 | struct cifsSesInfo *ses) |
540 | { |
541 | build_ntlmssp_negotiate_blob(&pSMB->req.SecurityBlob[0], ses); |
542 | pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE)); |
543 | |
544 | return; |
545 | } |
546 | |
547 | static int setup_ntlmssp_auth_req(SESSION_SETUP_ANDX *pSMB, |
548 | struct cifsSesInfo *ses, |
549 | const struct nls_table *nls, int first_time) |
550 | { |
551 | int bloblen; |
552 | |
553 | bloblen = build_ntlmssp_auth_blob(&pSMB->req.SecurityBlob[0], ses, nls, |
554 | first_time); |
555 | pSMB->req.SecurityBlobLength = cpu_to_le16(bloblen); |
556 | |
557 | return bloblen; |
558 | } |
559 | #endif |
560 | |
561 | int |
562 | CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time, |
563 | const struct nls_table *nls_cp) |
564 | { |
565 | int rc = 0; |
566 | int wct; |
567 | struct smb_hdr *smb_buf; |
568 | char *bcc_ptr; |
569 | char *str_area; |
570 | SESSION_SETUP_ANDX *pSMB; |
571 | __u32 capabilities; |
572 | int count; |
573 | int resp_buf_type; |
574 | struct kvec iov[3]; |
575 | enum securityEnum type; |
576 | __u16 action; |
577 | int bytes_remaining; |
578 | struct key *spnego_key = NULL; |
579 | __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */ |
580 | |
581 | if (ses == NULL) |
582 | return -EINVAL; |
583 | |
584 | type = ses->server->secType; |
585 | |
586 | cFYI(1, ("sess setup type %d", type)); |
587 | ssetup_ntlmssp_authenticate: |
588 | if (phase == NtLmChallenge) |
589 | phase = NtLmAuthenticate; /* if ntlmssp, now final phase */ |
590 | |
591 | if (type == LANMAN) { |
592 | #ifndef CONFIG_CIFS_WEAK_PW_HASH |
593 | /* LANMAN and plaintext are less secure and off by default. |
594 | So we make this explicitly be turned on in kconfig (in the |
595 | build) and turned on at runtime (changed from the default) |
596 | in proc/fs/cifs or via mount parm. Unfortunately this is |
597 | needed for old Win (e.g. Win95), some obscure NAS and OS/2 */ |
598 | return -EOPNOTSUPP; |
599 | #endif |
600 | wct = 10; /* lanman 2 style sessionsetup */ |
601 | } else if ((type == NTLM) || (type == NTLMv2)) { |
602 | /* For NTLMv2 failures eventually may need to retry NTLM */ |
603 | wct = 13; /* old style NTLM sessionsetup */ |
604 | } else /* same size: negotiate or auth, NTLMSSP or extended security */ |
605 | wct = 12; |
606 | |
607 | rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses, |
608 | (void **)&smb_buf); |
609 | if (rc) |
610 | return rc; |
611 | |
612 | pSMB = (SESSION_SETUP_ANDX *)smb_buf; |
613 | |
614 | capabilities = cifs_ssetup_hdr(ses, pSMB); |
615 | |
616 | /* we will send the SMB in three pieces: |
617 | a fixed length beginning part, an optional |
618 | SPNEGO blob (which can be zero length), and a |
619 | last part which will include the strings |
620 | and rest of bcc area. This allows us to avoid |
621 | a large buffer 17K allocation */ |
622 | iov[0].iov_base = (char *)pSMB; |
623 | iov[0].iov_len = smb_buf->smb_buf_length + 4; |
624 | |
625 | /* setting this here allows the code at the end of the function |
626 | to free the request buffer if there's an error */ |
627 | resp_buf_type = CIFS_SMALL_BUFFER; |
628 | |
629 | /* 2000 big enough to fit max user, domain, NOS name etc. */ |
630 | str_area = kmalloc(2000, GFP_KERNEL); |
631 | if (str_area == NULL) { |
632 | rc = -ENOMEM; |
633 | goto ssetup_exit; |
634 | } |
635 | bcc_ptr = str_area; |
636 | |
637 | ses->flags &= ~CIFS_SES_LANMAN; |
638 | |
639 | iov[1].iov_base = NULL; |
640 | iov[1].iov_len = 0; |
641 | |
642 | if (type == LANMAN) { |
643 | #ifdef CONFIG_CIFS_WEAK_PW_HASH |
644 | char lnm_session_key[CIFS_SESS_KEY_SIZE]; |
645 | |
646 | pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE; |
647 | |
648 | /* no capabilities flags in old lanman negotiation */ |
649 | |
650 | pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE); |
651 | /* BB calculate hash with password */ |
652 | /* and copy into bcc */ |
653 | |
654 | calc_lanman_hash(ses->password, ses->server->cryptKey, |
655 | ses->server->secMode & SECMODE_PW_ENCRYPT ? |
656 | true : false, lnm_session_key); |
657 | |
658 | ses->flags |= CIFS_SES_LANMAN; |
659 | memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_SESS_KEY_SIZE); |
660 | bcc_ptr += CIFS_SESS_KEY_SIZE; |
661 | |
662 | /* can not sign if LANMAN negotiated so no need |
663 | to calculate signing key? but what if server |
664 | changed to do higher than lanman dialect and |
665 | we reconnected would we ever calc signing_key? */ |
666 | |
667 | cFYI(1, ("Negotiating LANMAN setting up strings")); |
668 | /* Unicode not allowed for LANMAN dialects */ |
669 | ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); |
670 | #endif |
671 | } else if (type == NTLM) { |
672 | char ntlm_session_key[CIFS_SESS_KEY_SIZE]; |
673 | |
674 | pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); |
675 | pSMB->req_no_secext.CaseInsensitivePasswordLength = |
676 | cpu_to_le16(CIFS_SESS_KEY_SIZE); |
677 | pSMB->req_no_secext.CaseSensitivePasswordLength = |
678 | cpu_to_le16(CIFS_SESS_KEY_SIZE); |
679 | |
680 | /* calculate session key */ |
681 | SMBNTencrypt(ses->password, ses->server->cryptKey, |
682 | ntlm_session_key); |
683 | |
684 | if (first_time) /* should this be moved into common code |
685 | with similar ntlmv2 path? */ |
686 | cifs_calculate_mac_key(&ses->server->mac_signing_key, |
687 | ntlm_session_key, ses->password); |
688 | /* copy session key */ |
689 | |
690 | memcpy(bcc_ptr, (char *)ntlm_session_key, CIFS_SESS_KEY_SIZE); |
691 | bcc_ptr += CIFS_SESS_KEY_SIZE; |
692 | memcpy(bcc_ptr, (char *)ntlm_session_key, CIFS_SESS_KEY_SIZE); |
693 | bcc_ptr += CIFS_SESS_KEY_SIZE; |
694 | if (ses->capabilities & CAP_UNICODE) { |
695 | /* unicode strings must be word aligned */ |
696 | if (iov[0].iov_len % 2) { |
697 | *bcc_ptr = 0; |
698 | bcc_ptr++; |
699 | } |
700 | unicode_ssetup_strings(&bcc_ptr, ses, nls_cp); |
701 | } else |
702 | ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); |
703 | } else if (type == NTLMv2) { |
704 | char *v2_sess_key = |
705 | kmalloc(sizeof(struct ntlmv2_resp), GFP_KERNEL); |
706 | |
707 | /* BB FIXME change all users of v2_sess_key to |
708 | struct ntlmv2_resp */ |
709 | |
710 | if (v2_sess_key == NULL) { |
711 | rc = -ENOMEM; |
712 | goto ssetup_exit; |
713 | } |
714 | |
715 | pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); |
716 | |
717 | /* LM2 password would be here if we supported it */ |
718 | pSMB->req_no_secext.CaseInsensitivePasswordLength = 0; |
719 | /* cpu_to_le16(LM2_SESS_KEY_SIZE); */ |
720 | |
721 | pSMB->req_no_secext.CaseSensitivePasswordLength = |
722 | cpu_to_le16(sizeof(struct ntlmv2_resp)); |
723 | |
724 | /* calculate session key */ |
725 | setup_ntlmv2_rsp(ses, v2_sess_key, nls_cp); |
726 | if (first_time) /* should this be moved into common code |
727 | with similar ntlmv2 path? */ |
728 | /* cifs_calculate_ntlmv2_mac_key(ses->server->mac_signing_key, |
729 | response BB FIXME, v2_sess_key); */ |
730 | |
731 | /* copy session key */ |
732 | |
733 | /* memcpy(bcc_ptr, (char *)ntlm_session_key,LM2_SESS_KEY_SIZE); |
734 | bcc_ptr += LM2_SESS_KEY_SIZE; */ |
735 | memcpy(bcc_ptr, (char *)v2_sess_key, |
736 | sizeof(struct ntlmv2_resp)); |
737 | bcc_ptr += sizeof(struct ntlmv2_resp); |
738 | kfree(v2_sess_key); |
739 | if (ses->capabilities & CAP_UNICODE) { |
740 | if (iov[0].iov_len % 2) { |
741 | *bcc_ptr = 0; |
742 | bcc_ptr++; |
743 | } |
744 | unicode_ssetup_strings(&bcc_ptr, ses, nls_cp); |
745 | } else |
746 | ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); |
747 | } else if (type == Kerberos || type == MSKerberos) { |
748 | #ifdef CONFIG_CIFS_UPCALL |
749 | struct cifs_spnego_msg *msg; |
750 | spnego_key = cifs_get_spnego_key(ses); |
751 | if (IS_ERR(spnego_key)) { |
752 | rc = PTR_ERR(spnego_key); |
753 | spnego_key = NULL; |
754 | goto ssetup_exit; |
755 | } |
756 | |
757 | msg = spnego_key->payload.data; |
758 | /* check version field to make sure that cifs.upcall is |
759 | sending us a response in an expected form */ |
760 | if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) { |
761 | cERROR(1, ("incorrect version of cifs.upcall (expected" |
762 | " %d but got %d)", |
763 | CIFS_SPNEGO_UPCALL_VERSION, msg->version)); |
764 | rc = -EKEYREJECTED; |
765 | goto ssetup_exit; |
766 | } |
767 | /* bail out if key is too long */ |
768 | if (msg->sesskey_len > |
769 | sizeof(ses->server->mac_signing_key.data.krb5)) { |
770 | cERROR(1, ("Kerberos signing key too long (%u bytes)", |
771 | msg->sesskey_len)); |
772 | rc = -EOVERFLOW; |
773 | goto ssetup_exit; |
774 | } |
775 | if (first_time) { |
776 | ses->server->mac_signing_key.len = msg->sesskey_len; |
777 | memcpy(ses->server->mac_signing_key.data.krb5, |
778 | msg->data, msg->sesskey_len); |
779 | } |
780 | pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; |
781 | capabilities |= CAP_EXTENDED_SECURITY; |
782 | pSMB->req.Capabilities = cpu_to_le32(capabilities); |
783 | iov[1].iov_base = msg->data + msg->sesskey_len; |
784 | iov[1].iov_len = msg->secblob_len; |
785 | pSMB->req.SecurityBlobLength = cpu_to_le16(iov[1].iov_len); |
786 | |
787 | if (ses->capabilities & CAP_UNICODE) { |
788 | /* unicode strings must be word aligned */ |
789 | if ((iov[0].iov_len + iov[1].iov_len) % 2) { |
790 | *bcc_ptr = 0; |
791 | bcc_ptr++; |
792 | } |
793 | unicode_oslm_strings(&bcc_ptr, nls_cp); |
794 | unicode_domain_string(&bcc_ptr, ses, nls_cp); |
795 | } else |
796 | /* BB: is this right? */ |
797 | ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); |
798 | #else /* ! CONFIG_CIFS_UPCALL */ |
799 | cERROR(1, ("Kerberos negotiated but upcall support disabled!")); |
800 | rc = -ENOSYS; |
801 | goto ssetup_exit; |
802 | #endif /* CONFIG_CIFS_UPCALL */ |
803 | } else { |
804 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
805 | if (type == RawNTLMSSP) { |
806 | if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) { |
807 | cERROR(1, ("NTLMSSP requires Unicode support")); |
808 | rc = -ENOSYS; |
809 | goto ssetup_exit; |
810 | } |
811 | |
812 | cFYI(1, ("ntlmssp session setup phase %d", phase)); |
813 | pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; |
814 | capabilities |= CAP_EXTENDED_SECURITY; |
815 | pSMB->req.Capabilities |= cpu_to_le32(capabilities); |
816 | if (phase == NtLmNegotiate) { |
817 | setup_ntlmssp_neg_req(pSMB, ses); |
818 | iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE); |
819 | } else if (phase == NtLmAuthenticate) { |
820 | int blob_len; |
821 | blob_len = setup_ntlmssp_auth_req(pSMB, ses, |
822 | nls_cp, |
823 | first_time); |
824 | iov[1].iov_len = blob_len; |
825 | /* Make sure that we tell the server that we |
826 | are using the uid that it just gave us back |
827 | on the response (challenge) */ |
828 | smb_buf->Uid = ses->Suid; |
829 | } else { |
830 | cERROR(1, ("invalid phase %d", phase)); |
831 | rc = -ENOSYS; |
832 | goto ssetup_exit; |
833 | } |
834 | iov[1].iov_base = &pSMB->req.SecurityBlob[0]; |
835 | /* unicode strings must be word aligned */ |
836 | if ((iov[0].iov_len + iov[1].iov_len) % 2) { |
837 | *bcc_ptr = 0; |
838 | bcc_ptr++; |
839 | } |
840 | unicode_oslm_strings(&bcc_ptr, nls_cp); |
841 | } else { |
842 | cERROR(1, ("secType %d not supported!", type)); |
843 | rc = -ENOSYS; |
844 | goto ssetup_exit; |
845 | } |
846 | #else |
847 | cERROR(1, ("secType %d not supported!", type)); |
848 | rc = -ENOSYS; |
849 | goto ssetup_exit; |
850 | #endif |
851 | } |
852 | |
853 | iov[2].iov_base = str_area; |
854 | iov[2].iov_len = (long) bcc_ptr - (long) str_area; |
855 | |
856 | count = iov[1].iov_len + iov[2].iov_len; |
857 | smb_buf->smb_buf_length += count; |
858 | |
859 | BCC_LE(smb_buf) = cpu_to_le16(count); |
860 | |
861 | rc = SendReceive2(xid, ses, iov, 3 /* num_iovecs */, &resp_buf_type, |
862 | CIFS_STD_OP /* not long */ | CIFS_LOG_ERROR); |
863 | /* SMB request buf freed in SendReceive2 */ |
864 | |
865 | cFYI(1, ("ssetup rc from sendrecv2 is %d", rc)); |
866 | |
867 | pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base; |
868 | smb_buf = (struct smb_hdr *)iov[0].iov_base; |
869 | |
870 | if ((type == RawNTLMSSP) && (smb_buf->Status.CifsError == |
871 | cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))) { |
872 | if (phase != NtLmNegotiate) { |
873 | cERROR(1, ("Unexpected more processing error")); |
874 | goto ssetup_exit; |
875 | } |
876 | /* NTLMSSP Negotiate sent now processing challenge (response) */ |
877 | phase = NtLmChallenge; /* process ntlmssp challenge */ |
878 | rc = 0; /* MORE_PROC rc is not an error here, but expected */ |
879 | } |
880 | if (rc) |
881 | goto ssetup_exit; |
882 | |
883 | if ((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) { |
884 | rc = -EIO; |
885 | cERROR(1, ("bad word count %d", smb_buf->WordCount)); |
886 | goto ssetup_exit; |
887 | } |
888 | action = le16_to_cpu(pSMB->resp.Action); |
889 | if (action & GUEST_LOGIN) |
890 | cFYI(1, ("Guest login")); /* BB mark SesInfo struct? */ |
891 | ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ |
892 | cFYI(1, ("UID = %d ", ses->Suid)); |
893 | /* response can have either 3 or 4 word count - Samba sends 3 */ |
894 | /* and lanman response is 3 */ |
895 | bytes_remaining = BCC(smb_buf); |
896 | bcc_ptr = pByteArea(smb_buf); |
897 | |
898 | if (smb_buf->WordCount == 4) { |
899 | __u16 blob_len; |
900 | blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); |
901 | if (blob_len > bytes_remaining) { |
902 | cERROR(1, ("bad security blob length %d", blob_len)); |
903 | rc = -EINVAL; |
904 | goto ssetup_exit; |
905 | } |
906 | if (phase == NtLmChallenge) { |
907 | rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses); |
908 | /* now goto beginning for ntlmssp authenticate phase */ |
909 | if (rc) |
910 | goto ssetup_exit; |
911 | } |
912 | bcc_ptr += blob_len; |
913 | bytes_remaining -= blob_len; |
914 | } |
915 | |
916 | /* BB check if Unicode and decode strings */ |
917 | if (smb_buf->Flags2 & SMBFLG2_UNICODE) { |
918 | /* unicode string area must be word-aligned */ |
919 | if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) { |
920 | ++bcc_ptr; |
921 | --bytes_remaining; |
922 | } |
923 | decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, nls_cp); |
924 | } else { |
925 | rc = decode_ascii_ssetup(&bcc_ptr, bytes_remaining, |
926 | ses, nls_cp); |
927 | } |
928 | |
929 | ssetup_exit: |
930 | if (spnego_key) { |
931 | key_revoke(spnego_key); |
932 | key_put(spnego_key); |
933 | } |
934 | kfree(str_area); |
935 | if (resp_buf_type == CIFS_SMALL_BUFFER) { |
936 | cFYI(1, ("ssetup freeing small buf %p", iov[0].iov_base)); |
937 | cifs_small_buf_release(iov[0].iov_base); |
938 | } else if (resp_buf_type == CIFS_LARGE_BUFFER) |
939 | cifs_buf_release(iov[0].iov_base); |
940 | |
941 | /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */ |
942 | if ((phase == NtLmChallenge) && (rc == 0)) |
943 | goto ssetup_ntlmssp_authenticate; |
944 | |
945 | return rc; |
946 | } |
947 |
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