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TOMOYO Linux Cross Reference
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         sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
402 
403         memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
404         sec_blob->MessageType = NtLmAuthenticate;
405 
406         flags = NTLMSSP_NEGOTIATE_56 |
407                 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
408                 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
409                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
410                 NTLMSSP_NEGOTIATE_SEAL;
411         if (ses->server->sign)
412                 flags |= NTLMSSP_NEGOTIATE_SIGN;
413         if (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
414                 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
415 
416         tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
417         sec_blob->NegotiateFlags = cpu_to_le32(flags);
418 
419         sec_blob->LmChallengeResponse.BufferOffset =
420                                 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
421         sec_blob->LmChallengeResponse.Length = 0;
422         sec_blob->LmChallengeResponse.MaximumLength = 0;
423 
424         sec_blob->NtChallengeResponse.BufferOffset =
425                                 cpu_to_le32(tmp - *pbuffer);
426         if (ses->user_name != NULL) {
427                 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
428                                 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
429                 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
430 
431                 sec_blob->NtChallengeResponse.Length =
432                                 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
433                 sec_blob->NtChallengeResponse.MaximumLength =
434                                 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
435         } else {
436                 /*
437                  * don't send an NT Response for anonymous access
438                  */
439                 sec_blob->NtChallengeResponse.Length = 0;
440                 sec_blob->NtChallengeResponse.MaximumLength = 0;
441         }
442 
443         if (ses->domainName == NULL) {
444                 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
445                 sec_blob->DomainName.Length = 0;
446                 sec_blob->DomainName.MaximumLength = 0;
447                 tmp += 2;
448         } else {
449                 int len;
450                 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
451                                       CIFS_MAX_DOMAINNAME_LEN, nls_cp);
452                 len *= 2; /* unicode is 2 bytes each */
453                 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
454                 sec_blob->DomainName.Length = cpu_to_le16(len);
455                 sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
456                 tmp += len;
457         }
458 
459         if (ses->user_name == NULL) {
460                 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
461                 sec_blob->UserName.Length = 0;
462                 sec_blob->UserName.MaximumLength = 0;
463                 tmp += 2;
464         } else {
465                 int len;
466                 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
467                                       CIFS_MAX_USERNAME_LEN, nls_cp);
468                 len *= 2; /* unicode is 2 bytes each */
469                 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
470                 sec_blob->UserName.Length = cpu_to_le16(len);
471                 sec_blob->UserName.MaximumLength = cpu_to_le16(len);
472                 tmp += len;
473         }
474 
475         sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - *pbuffer);
476         sec_blob->WorkstationName.Length = 0;
477         sec_blob->WorkstationName.MaximumLength = 0;
478         tmp += 2;
479 
480         if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
481                 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
482                         && !calc_seckey(ses)) {
483                 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
484                 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
485                 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
486                 sec_blob->SessionKey.MaximumLength =
487                                 cpu_to_le16(CIFS_CPHTXT_SIZE);
488                 tmp += CIFS_CPHTXT_SIZE;
489         } else {
490                 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
491                 sec_blob->SessionKey.Length = 0;
492                 sec_blob->SessionKey.MaximumLength = 0;
493         }
494 
495         *buflen = tmp - *pbuffer;
496 setup_ntlmv2_ret:
497         return rc;
498 }
499 
500 enum securityEnum
501 cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
502 {
503         switch (server->negflavor) {
504         case CIFS_NEGFLAVOR_EXTENDED:
505                 switch (requested) {
506                 case Kerberos:
507                 case RawNTLMSSP:
508                         return requested;
509                 case Unspecified:
510                         if (server->sec_ntlmssp &&
511                             (global_secflags & CIFSSEC_MAY_NTLMSSP))
512                                 return RawNTLMSSP;
513                         if ((server->sec_kerberos || server->sec_mskerberos) &&
514                             (global_secflags & CIFSSEC_MAY_KRB5))
515                                 return Kerberos;
516                         /* Fallthrough */
517                 default:
518                         return Unspecified;
519                 }
520         case CIFS_NEGFLAVOR_UNENCAP:
521                 switch (requested) {
522                 case NTLM:
523                 case NTLMv2:
524                         return requested;
525                 case Unspecified:
526                         if (global_secflags & CIFSSEC_MAY_NTLMV2)
527                                 return NTLMv2;
528                         if (global_secflags & CIFSSEC_MAY_NTLM)
529                                 return NTLM;
530                 default:
531                         /* Fallthrough to attempt LANMAN authentication next */
532                         break;
533                 }
534         case CIFS_NEGFLAVOR_LANMAN:
535                 switch (requested) {
536                 case LANMAN:
537                         return requested;
538                 case Unspecified:
539                         if (global_secflags & CIFSSEC_MAY_LANMAN)
540                                 return LANMAN;
541                         /* Fallthrough */
542                 default:
543                         return Unspecified;
544                 }
545         default:
546                 return Unspecified;
547         }
548 }
549 
550 struct sess_data {
551         unsigned int xid;
552         struct cifs_ses *ses;
553         struct nls_table *nls_cp;
554         void (*func)(struct sess_data *);
555         int result;
556 
557         /* we will send the SMB in three pieces:
558          * a fixed length beginning part, an optional
559          * SPNEGO blob (which can be zero length), and a
560          * last part which will include the strings
561          * and rest of bcc area. This allows us to avoid
562          * a large buffer 17K allocation
563          */
564         int buf0_type;
565         struct kvec iov[3];
566 };
567 
568 static int
569 sess_alloc_buffer(struct sess_data *sess_data, int wct)
570 {
571         int rc;
572         struct cifs_ses *ses = sess_data->ses;
573         struct smb_hdr *smb_buf;
574 
575         rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
576                                   (void **)&smb_buf);
577 
578         if (rc)
579                 return rc;
580 
581         sess_data->iov[0].iov_base = (char *)smb_buf;
582         sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
583         /*
584          * This variable will be used to clear the buffer
585          * allocated above in case of any error in the calling function.
586          */
587         sess_data->buf0_type = CIFS_SMALL_BUFFER;
588 
589         /* 2000 big enough to fit max user, domain, NOS name etc. */
590         sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
591         if (!sess_data->iov[2].iov_base) {
592                 rc = -ENOMEM;
593                 goto out_free_smb_buf;
594         }
595 
596         return 0;
597 
598 out_free_smb_buf:
599         kfree(smb_buf);
600         sess_data->iov[0].iov_base = NULL;
601         sess_data->iov[0].iov_len = 0;
602         sess_data->buf0_type = CIFS_NO_BUFFER;
603         return rc;
604 }
605 
606 static void
607 sess_free_buffer(struct sess_data *sess_data)
608 {
609 
610         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
611         sess_data->buf0_type = CIFS_NO_BUFFER;
612         kfree(sess_data->iov[2].iov_base);
613 }
614 
615 static int
616 sess_establish_session(struct sess_data *sess_data)
617 {
618         struct cifs_ses *ses = sess_data->ses;
619 
620         mutex_lock(&ses->server->srv_mutex);
621         if (!ses->server->session_estab) {
622                 if (ses->server->sign) {
623                         ses->server->session_key.response =
624                                 kmemdup(ses->auth_key.response,
625                                 ses->auth_key.len, GFP_KERNEL);
626                         if (!ses->server->session_key.response) {
627                                 mutex_unlock(&ses->server->srv_mutex);
628                                 return -ENOMEM;
629                         }
630                         ses->server->session_key.len =
631                                                 ses->auth_key.len;
632                 }
633                 ses->server->sequence_number = 0x2;
634                 ses->server->session_estab = true;
635         }
636         mutex_unlock(&ses->server->srv_mutex);
637 
638         cifs_dbg(FYI, "CIFS session established successfully\n");
639         spin_lock(&GlobalMid_Lock);
640         ses->status = CifsGood;
641         ses->need_reconnect = false;
642         spin_unlock(&GlobalMid_Lock);
643 
644         return 0;
645 }
646 
647 static int
648 sess_sendreceive(struct sess_data *sess_data)
649 {
650         int rc;
651         struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
652         __u16 count;
653         struct kvec rsp_iov = { NULL, 0 };
654 
655         count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
656         smb_buf->smb_buf_length =
657                 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
658         put_bcc(count, smb_buf);
659 
660         rc = SendReceive2(sess_data->xid, sess_data->ses,
661                           sess_data->iov, 3 /* num_iovecs */,
662                           &sess_data->buf0_type,
663                           CIFS_LOG_ERROR, &rsp_iov);
664         cifs_small_buf_release(sess_data->iov[0].iov_base);
665         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
666 
667         return rc;
668 }
669 
670 /*
671  * LANMAN and plaintext are less secure and off by default.
672  * So we make this explicitly be turned on in kconfig (in the
673  * build) and turned on at runtime (changed from the default)
674  * in proc/fs/cifs or via mount parm.  Unfortunately this is
675  * needed for old Win (e.g. Win95), some obscure NAS and OS/2
676  */
677 #ifdef CONFIG_CIFS_WEAK_PW_HASH
678 static void
679 sess_auth_lanman(struct sess_data *sess_data)
680 {
681         int rc = 0;
682         struct smb_hdr *smb_buf;
683         SESSION_SETUP_ANDX *pSMB;
684         char *bcc_ptr;
685         struct cifs_ses *ses = sess_data->ses;
686         char lnm_session_key[CIFS_AUTH_RESP_SIZE];
687         __u32 capabilities;
688         __u16 bytes_remaining;
689 
690         /* lanman 2 style sessionsetup */
691         /* wct = 10 */
692         rc = sess_alloc_buffer(sess_data, 10);
693         if (rc)
694                 goto out;
695 
696         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
697         bcc_ptr = sess_data->iov[2].iov_base;
698         capabilities = cifs_ssetup_hdr(ses, pSMB);
699 
700         pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
701 
702         if (ses->user_name != NULL) {
703                 /* no capabilities flags in old lanman negotiation */
704                 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
705 
706                 /* Calculate hash with password and copy into bcc_ptr.
707                  * Encryption Key (stored as in cryptkey) gets used if the
708                  * security mode bit in Negottiate Protocol response states
709                  * to use challenge/response method (i.e. Password bit is 1).
710                  */
711                 rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
712                                       ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
713                                       true : false, lnm_session_key);
714                 if (rc)
715                         goto out;
716 
717                 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
718                 bcc_ptr += CIFS_AUTH_RESP_SIZE;
719         } else {
720                 pSMB->old_req.PasswordLength = 0;
721         }
722 
723         /*
724          * can not sign if LANMAN negotiated so no need
725          * to calculate signing key? but what if server
726          * changed to do higher than lanman dialect and
727          * we reconnected would we ever calc signing_key?
728          */
729 
730         cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
731         /* Unicode not allowed for LANMAN dialects */
732         ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
733 
734         sess_data->iov[2].iov_len = (long) bcc_ptr -
735                         (long) sess_data->iov[2].iov_base;
736 
737         rc = sess_sendreceive(sess_data);
738         if (rc)
739                 goto out;
740 
741         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
742         smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
743 
744         /* lanman response has a word count of 3 */
745         if (smb_buf->WordCount != 3) {
746                 rc = -EIO;
747                 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
748                 goto out;
749         }
750 
751         if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
752                 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
753 
754         ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
755         cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
756 
757         bytes_remaining = get_bcc(smb_buf);
758         bcc_ptr = pByteArea(smb_buf);
759 
760         /* BB check if Unicode and decode strings */
761         if (bytes_remaining == 0) {
762                 /* no string area to decode, do nothing */
763         } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
764                 /* unicode string area must be word-aligned */
765                 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
766                         ++bcc_ptr;
767                         --bytes_remaining;
768                 }
769                 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
770                                       sess_data->nls_cp);
771         } else {
772                 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
773                                     sess_data->nls_cp);
774         }
775 
776         rc = sess_establish_session(sess_data);
777 out:
778         sess_data->result = rc;
779         sess_data->func = NULL;
780         sess_free_buffer(sess_data);
781 }
782 
783 #endif
784 
785 static void
786 sess_auth_ntlm(struct sess_data *sess_data)
787 {
788         int rc = 0;
789         struct smb_hdr *smb_buf;
790         SESSION_SETUP_ANDX *pSMB;
791         char *bcc_ptr;
792         struct cifs_ses *ses = sess_data->ses;
793         __u32 capabilities;
794         __u16 bytes_remaining;
795 
796         /* old style NTLM sessionsetup */
797         /* wct = 13 */
798         rc = sess_alloc_buffer(sess_data, 13);
799         if (rc)
800                 goto out;
801 
802         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
803         bcc_ptr = sess_data->iov[2].iov_base;
804         capabilities = cifs_ssetup_hdr(ses, pSMB);
805 
806         pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
807         if (ses->user_name != NULL) {
808                 pSMB->req_no_secext.CaseInsensitivePasswordLength =
809                                 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
810                 pSMB->req_no_secext.CaseSensitivePasswordLength =
811                                 cpu_to_le16(CIFS_AUTH_RESP_SIZE);
812 
813                 /* calculate ntlm response and session key */
814                 rc = setup_ntlm_response(ses, sess_data->nls_cp);
815                 if (rc) {
816                         cifs_dbg(VFS, "Error %d during NTLM authentication\n",
817                                          rc);
818                         goto out;
819                 }
820 
821                 /* copy ntlm response */
822                 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
823                                 CIFS_AUTH_RESP_SIZE);
824                 bcc_ptr += CIFS_AUTH_RESP_SIZE;
825                 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
826                                 CIFS_AUTH_RESP_SIZE);
827                 bcc_ptr += CIFS_AUTH_RESP_SIZE;
828         } else {
829                 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
830                 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
831         }
832 
833         if (ses->capabilities & CAP_UNICODE) {
834                 /* unicode strings must be word aligned */
835                 if (sess_data->iov[0].iov_len % 2) {
836                         *bcc_ptr = 0;
837                         bcc_ptr++;
838                 }
839                 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
840         } else {
841                 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
842         }
843 
844 
845         sess_data->iov[2].iov_len = (long) bcc_ptr -
846                         (long) sess_data->iov[2].iov_base;
847 
848         rc = sess_sendreceive(sess_data);
849         if (rc)
850                 goto out;
851 
852         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
853         smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
854 
855         if (smb_buf->WordCount != 3) {
856                 rc = -EIO;
857                 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
858                 goto out;
859         }
860 
861         if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
862                 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
863 
864         ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
865         cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
866 
867         bytes_remaining = get_bcc(smb_buf);
868         bcc_ptr = pByteArea(smb_buf);
869 
870         /* BB check if Unicode and decode strings */
871         if (bytes_remaining == 0) {
872                 /* no string area to decode, do nothing */
873         } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
874                 /* unicode string area must be word-aligned */
875                 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
876                         ++bcc_ptr;
877                         --bytes_remaining;
878                 }
879                 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
880                                       sess_data->nls_cp);
881         } else {
882                 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
883                                     sess_data->nls_cp);
884         }
885 
886         rc = sess_establish_session(sess_data);
887 out:
888         sess_data->result = rc;
889         sess_data->func = NULL;
890         sess_free_buffer(sess_data);
891         kfree(ses->auth_key.response);
892         ses->auth_key.response = NULL;
893 }
894 
895 static void
896 sess_auth_ntlmv2(struct sess_data *sess_data)
897 {
898         int rc = 0;
899         struct smb_hdr *smb_buf;
900         SESSION_SETUP_ANDX *pSMB;
901         char *bcc_ptr;
902         struct cifs_ses *ses = sess_data->ses;
903         __u32 capabilities;
904         __u16 bytes_remaining;
905 
906         /* old style NTLM sessionsetup */
907         /* wct = 13 */
908         rc = sess_alloc_buffer(sess_data, 13);
909         if (rc)
910                 goto out;
911 
912         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
913         bcc_ptr = sess_data->iov[2].iov_base;
914         capabilities = cifs_ssetup_hdr(ses, pSMB);
915 
916         pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
917 
918         /* LM2 password would be here if we supported it */
919         pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
920 
921         if (ses->user_name != NULL) {
922                 /* calculate nlmv2 response and session key */
923                 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
924                 if (rc) {
925                         cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
926                         goto out;
927                 }
928 
929                 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
930                                 ses->auth_key.len - CIFS_SESS_KEY_SIZE);
931                 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
932 
933                 /* set case sensitive password length after tilen may get
934                  * assigned, tilen is 0 otherwise.
935                  */
936                 pSMB->req_no_secext.CaseSensitivePasswordLength =
937                         cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
938         } else {
939                 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
940         }
941 
942         if (ses->capabilities & CAP_UNICODE) {
943                 if (sess_data->iov[0].iov_len % 2) {
944                         *bcc_ptr = 0;
945                         bcc_ptr++;
946                 }
947                 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
948         } else {
949                 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
950         }
951 
952 
953         sess_data->iov[2].iov_len = (long) bcc_ptr -
954                         (long) sess_data->iov[2].iov_base;
955 
956         rc = sess_sendreceive(sess_data);
957         if (rc)
958                 goto out;
959 
960         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
961         smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
962 
963         if (smb_buf->WordCount != 3) {
964                 rc = -EIO;
965                 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
966                 goto out;
967         }
968 
969         if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
970                 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
971 
972         ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
973         cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
974 
975         bytes_remaining = get_bcc(smb_buf);
976         bcc_ptr = pByteArea(smb_buf);
977 
978         /* BB check if Unicode and decode strings */
979         if (bytes_remaining == 0) {
980                 /* no string area to decode, do nothing */
981         } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
982                 /* unicode string area must be word-aligned */
983                 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
984                         ++bcc_ptr;
985                         --bytes_remaining;
986                 }
987                 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
988                                       sess_data->nls_cp);
989         } else {
990                 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
991                                     sess_data->nls_cp);
992         }
993 
994         rc = sess_establish_session(sess_data);
995 out:
996         sess_data->result = rc;
997         sess_data->func = NULL;
998         sess_free_buffer(sess_data);
999         kfree(ses->auth_key.response);
1000         ses->auth_key.response = NULL;
1001 }
1002 
1003 #ifdef CONFIG_CIFS_UPCALL
1004 static void
1005 sess_auth_kerberos(struct sess_data *sess_data)
1006 {
1007         int rc = 0;
1008         struct smb_hdr *smb_buf;
1009         SESSION_SETUP_ANDX *pSMB;
1010         char *bcc_ptr;
1011         struct cifs_ses *ses = sess_data->ses;
1012         __u32 capabilities;
1013         __u16 bytes_remaining;
1014         struct key *spnego_key = NULL;
1015         struct cifs_spnego_msg *msg;
1016         u16 blob_len;
1017 
1018         /* extended security */
1019         /* wct = 12 */
1020         rc = sess_alloc_buffer(sess_data, 12);
1021         if (rc)
1022                 goto out;
1023 
1024         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1025         bcc_ptr = sess_data->iov[2].iov_base;
1026         capabilities = cifs_ssetup_hdr(ses, pSMB);
1027 
1028         spnego_key = cifs_get_spnego_key(ses);
1029         if (IS_ERR(spnego_key)) {
1030                 rc = PTR_ERR(spnego_key);
1031                 spnego_key = NULL;
1032                 goto out;
1033         }
1034 
1035         msg = spnego_key->payload.data[0];
1036         /*
1037          * check version field to make sure that cifs.upcall is
1038          * sending us a response in an expected form
1039          */
1040         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1041                 cifs_dbg(VFS,
1042                   "incorrect version of cifs.upcall (expected %d but got %d)",
1043                               CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1044                 rc = -EKEYREJECTED;
1045                 goto out_put_spnego_key;
1046         }
1047 
1048         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1049                                          GFP_KERNEL);
1050         if (!ses->auth_key.response) {
1051                 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory",
1052                                 msg->sesskey_len);
1053                 rc = -ENOMEM;
1054                 goto out_put_spnego_key;
1055         }
1056         ses->auth_key.len = msg->sesskey_len;
1057 
1058         pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1059         capabilities |= CAP_EXTENDED_SECURITY;
1060         pSMB->req.Capabilities = cpu_to_le32(capabilities);
1061         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1062         sess_data->iov[1].iov_len = msg->secblob_len;
1063         pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
1064 
1065         if (ses->capabilities & CAP_UNICODE) {
1066                 /* unicode strings must be word aligned */
1067                 if ((sess_data->iov[0].iov_len
1068                         + sess_data->iov[1].iov_len) % 2) {
1069                         *bcc_ptr = 0;
1070                         bcc_ptr++;
1071                 }
1072                 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1073                 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
1074         } else {
1075                 /* BB: is this right? */
1076                 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
1077         }
1078 
1079         sess_data->iov[2].iov_len = (long) bcc_ptr -
1080                         (long) sess_data->iov[2].iov_base;
1081 
1082         rc = sess_sendreceive(sess_data);
1083         if (rc)
1084                 goto out_put_spnego_key;
1085 
1086         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1087         smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1088 
1089         if (smb_buf->WordCount != 4) {
1090                 rc = -EIO;
1091                 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1092                 goto out_put_spnego_key;
1093         }
1094 
1095         if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1096                 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1097 
1098         ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
1099         cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1100 
1101         bytes_remaining = get_bcc(smb_buf);
1102         bcc_ptr = pByteArea(smb_buf);
1103 
1104         blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1105         if (blob_len > bytes_remaining) {
1106                 cifs_dbg(VFS, "bad security blob length %d\n",
1107                                 blob_len);
1108                 rc = -EINVAL;
1109                 goto out_put_spnego_key;
1110         }
1111         bcc_ptr += blob_len;
1112         bytes_remaining -= blob_len;
1113 
1114         /* BB check if Unicode and decode strings */
1115         if (bytes_remaining == 0) {
1116                 /* no string area to decode, do nothing */
1117         } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1118                 /* unicode string area must be word-aligned */
1119                 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1120                         ++bcc_ptr;
1121                         --bytes_remaining;
1122                 }
1123                 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1124                                       sess_data->nls_cp);
1125         } else {
1126                 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1127                                     sess_data->nls_cp);
1128         }
1129 
1130         rc = sess_establish_session(sess_data);
1131 out_put_spnego_key:
1132         key_invalidate(spnego_key);
1133         key_put(spnego_key);
1134 out:
1135         sess_data->result = rc;
1136         sess_data->func = NULL;
1137         sess_free_buffer(sess_data);
1138         kfree(ses->auth_key.response);
1139         ses->auth_key.response = NULL;
1140 }
1141 
1142 #endif /* ! CONFIG_CIFS_UPCALL */
1143 
1144 /*
1145  * The required kvec buffers have to be allocated before calling this
1146  * function.
1147  */
1148 static int
1149 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
1150 {
1151         struct smb_hdr *smb_buf;
1152         SESSION_SETUP_ANDX *pSMB;
1153         struct cifs_ses *ses = sess_data->ses;
1154         __u32 capabilities;
1155         char *bcc_ptr;
1156 
1157         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1158         smb_buf = (struct smb_hdr *)pSMB;
1159 
1160         capabilities = cifs_ssetup_hdr(ses, pSMB);
1161         if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
1162                 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
1163                 return -ENOSYS;
1164         }
1165 
1166         pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
1167         capabilities |= CAP_EXTENDED_SECURITY;
1168         pSMB->req.Capabilities |= cpu_to_le32(capabilities);
1169 
1170         bcc_ptr = sess_data->iov[2].iov_base;
1171         /* unicode strings must be word aligned */
1172         if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
1173                 *bcc_ptr = 0;
1174                 bcc_ptr++;
1175         }
1176         unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
1177 
1178         sess_data->iov[2].iov_len = (long) bcc_ptr -
1179                                         (long) sess_data->iov[2].iov_base;
1180 
1181         return 0;
1182 }
1183 
1184 static void
1185 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
1186 
1187 static void
1188 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
1189 {
1190         int rc;
1191         struct smb_hdr *smb_buf;
1192         SESSION_SETUP_ANDX *pSMB;
1193         struct cifs_ses *ses = sess_data->ses;
1194         __u16 bytes_remaining;
1195         char *bcc_ptr;
1196         u16 blob_len;
1197 
1198         cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
1199 
1200         /*
1201          * if memory allocation is successful, caller of this function
1202          * frees it.
1203          */
1204         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1205         if (!ses->ntlmssp) {
1206                 rc = -ENOMEM;
1207                 goto out;
1208         }
1209         ses->ntlmssp->sesskey_per_smbsess = false;
1210 
1211         /* wct = 12 */
1212         rc = sess_alloc_buffer(sess_data, 12);
1213         if (rc)
1214                 goto out;
1215 
1216         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1217 
1218         /* Build security blob before we assemble the request */
1219         build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses);
1220         sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
1221         sess_data->iov[1].iov_base = pSMB->req.SecurityBlob;
1222         pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
1223 
1224         rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1225         if (rc)
1226                 goto out;
1227 
1228         rc = sess_sendreceive(sess_data);
1229 
1230         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1231         smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1232 
1233         /* If true, rc here is expected and not an error */
1234         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1235             smb_buf->Status.CifsError ==
1236                         cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
1237                 rc = 0;
1238 
1239         if (rc)
1240                 goto out;
1241 
1242         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1243 
1244         if (smb_buf->WordCount != 4) {
1245                 rc = -EIO;
1246                 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1247                 goto out;
1248         }
1249 
1250         ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
1251         cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
1252 
1253         bytes_remaining = get_bcc(smb_buf);
1254         bcc_ptr = pByteArea(smb_buf);
1255 
1256         blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1257         if (blob_len > bytes_remaining) {
1258                 cifs_dbg(VFS, "bad security blob length %d\n",
1259                                 blob_len);
1260                 rc = -EINVAL;
1261                 goto out;
1262         }
1263 
1264         rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
1265 out:
1266         sess_free_buffer(sess_data);
1267 
1268         if (!rc) {
1269                 sess_data->func = sess_auth_rawntlmssp_authenticate;
1270                 return;
1271         }
1272 
1273         /* Else error. Cleanup */
1274         kfree(ses->auth_key.response);
1275         ses->auth_key.response = NULL;
1276         kfree(ses->ntlmssp);
1277         ses->ntlmssp = NULL;
1278 
1279         sess_data->func = NULL;
1280         sess_data->result = rc;
1281 }
1282 
1283 static void
1284 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
1285 {
1286         int rc;
1287         struct smb_hdr *smb_buf;
1288         SESSION_SETUP_ANDX *pSMB;
1289         struct cifs_ses *ses = sess_data->ses;
1290         __u16 bytes_remaining;
1291         char *bcc_ptr;
1292         unsigned char *ntlmsspblob = NULL;
1293         u16 blob_len;
1294 
1295         cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
1296 
1297         /* wct = 12 */
1298         rc = sess_alloc_buffer(sess_data, 12);
1299         if (rc)
1300                 goto out;
1301 
1302         /* Build security blob before we assemble the request */
1303         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1304         smb_buf = (struct smb_hdr *)pSMB;
1305         rc = build_ntlmssp_auth_blob(&ntlmsspblob,
1306                                         &blob_len, ses, sess_data->nls_cp);
1307         if (rc)
1308                 goto out_free_ntlmsspblob;
1309         sess_data->iov[1].iov_len = blob_len;
1310         sess_data->iov[1].iov_base = ntlmsspblob;
1311         pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
1312         /*
1313          * Make sure that we tell the server that we are using
1314          * the uid that it just gave us back on the response
1315          * (challenge)
1316          */
1317         smb_buf->Uid = ses->Suid;
1318 
1319         rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
1320         if (rc)
1321                 goto out_free_ntlmsspblob;
1322 
1323         rc = sess_sendreceive(sess_data);
1324         if (rc)
1325                 goto out_free_ntlmsspblob;
1326 
1327         pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
1328         smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
1329         if (smb_buf->WordCount != 4) {
1330                 rc = -EIO;
1331                 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
1332                 goto out_free_ntlmsspblob;
1333         }
1334 
1335         if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
1336                 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
1337 
1338         if (ses->Suid != smb_buf->Uid) {
1339                 ses->Suid = smb_buf->Uid;
1340                 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
1341         }
1342 
1343         bytes_remaining = get_bcc(smb_buf);
1344         bcc_ptr = pByteArea(smb_buf);
1345         blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
1346         if (blob_len > bytes_remaining) {
1347                 cifs_dbg(VFS, "bad security blob length %d\n",
1348                                 blob_len);
1349                 rc = -EINVAL;
1350                 goto out_free_ntlmsspblob;
1351         }
1352         bcc_ptr += blob_len;
1353         bytes_remaining -= blob_len;
1354 
1355 
1356         /* BB check if Unicode and decode strings */
1357         if (bytes_remaining == 0) {
1358                 /* no string area to decode, do nothing */
1359         } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
1360                 /* unicode string area must be word-aligned */
1361                 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
1362                         ++bcc_ptr;
1363                         --bytes_remaining;
1364                 }
1365                 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
1366                                       sess_data->nls_cp);
1367         } else {
1368                 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
1369                                     sess_data->nls_cp);
1370         }
1371 
1372 out_free_ntlmsspblob:
1373         kfree(ntlmsspblob);
1374 out:
1375         sess_free_buffer(sess_data);
1376 
1377          if (!rc)
1378                 rc = sess_establish_session(sess_data);
1379 
1380         /* Cleanup */
1381         kfree(ses->auth_key.response);
1382         ses->auth_key.response = NULL;
1383         kfree(ses->ntlmssp);
1384         ses->ntlmssp = NULL;
1385 
1386         sess_data->func = NULL;
1387         sess_data->result = rc;
1388 }
1389 
1390 static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data)
1391 {
1392         int type;
1393 
1394         type = cifs_select_sectype(ses->server, ses->sectype);
1395         cifs_dbg(FYI, "sess setup type %d\n", type);
1396         if (type == Unspecified) {
1397                 cifs_dbg(VFS,
1398                         "Unable to select appropriate authentication method!");
1399                 return -EINVAL;
1400         }
1401 
1402         switch (type) {
1403         case LANMAN:
1404                 /* LANMAN and plaintext are less secure and off by default.
1405                  * So we make this explicitly be turned on in kconfig (in the
1406                  * build) and turned on at runtime (changed from the default)
1407                  * in proc/fs/cifs or via mount parm.  Unfortunately this is
1408                  * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
1409 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1410                 sess_data->func = sess_auth_lanman;
1411                 break;
1412 #else
1413                 return -EOPNOTSUPP;
1414 #endif
1415         case NTLM:
1416                 sess_data->func = sess_auth_ntlm;
1417                 break;
1418         case NTLMv2:
1419                 sess_data->func = sess_auth_ntlmv2;
1420                 break;
1421         case Kerberos:
1422 #ifdef CONFIG_CIFS_UPCALL
1423                 sess_data->func = sess_auth_kerberos;
1424                 break;
1425 #else
1426                 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1427                 return -ENOSYS;
1428                 break;
1429 #endif /* CONFIG_CIFS_UPCALL */
1430         case RawNTLMSSP:
1431                 sess_data->func = sess_auth_rawntlmssp_negotiate;
1432                 break;
1433         default:
1434                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1435                 return -ENOSYS;
1436         }
1437 
1438         return 0;
1439 }
1440 
1441 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
1442                     const struct nls_table *nls_cp)
1443 {
1444         int rc = 0;
1445         struct sess_data *sess_data;
1446 
1447         if (ses == NULL) {
1448                 WARN(1, "%s: ses == NULL!", __func__);
1449                 return -EINVAL;
1450         }
1451 
1452         sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
1453         if (!sess_data)
1454                 return -ENOMEM;
1455 
1456         rc = select_sec(ses, sess_data);
1457         if (rc)
1458                 goto out;
1459 
1460         sess_data->xid = xid;
1461         sess_data->ses = ses;
1462         sess_data->buf0_type = CIFS_NO_BUFFER;
1463         sess_data->nls_cp = (struct nls_table *) nls_cp;
1464 
1465         while (sess_data->func)
1466                 sess_data->func(sess_data);
1467 
1468         /* Store result before we free sess_data */
1469         rc = sess_data->result;
1470 
1471 out:
1472         kfree(sess_data);
1473         return rc;
1474 }
1475 

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