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