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Linux/fs/cifs/sess.c

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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 <linux/slab.h>
 33 #include "cifs_spnego.h"
 34 
 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
 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 
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 
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 
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
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 
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 
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 */
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 
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 
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
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
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         kfree(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
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
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
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
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
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
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
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
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
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
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 
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 
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 

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