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Commit | Line | Data |
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3979877e SF |
1 | /* |
2 | * fs/cifs/sess.c | |
3 | * | |
4 | * SMB/CIFS session setup handling routines | |
5 | * | |
d185cda7 | 6 | * Copyright (c) International Business Machines Corp., 2006, 2009 |
3979877e SF |
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" | |
9c53588e | 31 | #include <linux/utsname.h> |
5a0e3ad6 | 32 | #include <linux/slab.h> |
2442421b | 33 | #include "cifs_spnego.h" |
3979877e | 34 | |
ebe6aa5a JL |
35 | /* |
36 | * Checks if this is the first smb session to be reconnected after | |
37 | * the socket has been reestablished (so we know whether to use vc 0). | |
38 | * Called while holding the cifs_tcp_ses_lock, so do not block | |
39 | */ | |
96daf2b0 | 40 | static bool is_first_ses_reconnect(struct cifs_ses *ses) |
eca6acf9 SF |
41 | { |
42 | struct list_head *tmp; | |
96daf2b0 | 43 | struct cifs_ses *tmp_ses; |
eca6acf9 SF |
44 | |
45 | list_for_each(tmp, &ses->server->smb_ses_list) { | |
96daf2b0 | 46 | tmp_ses = list_entry(tmp, struct cifs_ses, |
eca6acf9 SF |
47 | smb_ses_list); |
48 | if (tmp_ses->need_reconnect == false) | |
49 | return false; | |
50 | } | |
51 | /* could not find a session that was already connected, | |
52 | this must be the first one we are reconnecting */ | |
53 | return true; | |
54 | } | |
55 | ||
56 | /* | |
57 | * vc number 0 is treated specially by some servers, and should be the | |
58 | * first one we request. After that we can use vcnumbers up to maxvcs, | |
59 | * one for each smb session (some Windows versions set maxvcs incorrectly | |
60 | * so maxvc=1 can be ignored). If we have too many vcs, we can reuse | |
61 | * any vc but zero (some servers reset the connection on vcnum zero) | |
62 | * | |
63 | */ | |
96daf2b0 | 64 | static __le16 get_next_vcnum(struct cifs_ses *ses) |
eca6acf9 SF |
65 | { |
66 | __u16 vcnum = 0; | |
67 | struct list_head *tmp; | |
96daf2b0 | 68 | struct cifs_ses *tmp_ses; |
eca6acf9 SF |
69 | __u16 max_vcs = ses->server->max_vcs; |
70 | __u16 i; | |
71 | int free_vc_found = 0; | |
72 | ||
73 | /* Quoting the MS-SMB specification: "Windows-based SMB servers set this | |
74 | field to one but do not enforce this limit, which allows an SMB client | |
75 | to establish more virtual circuits than allowed by this value ... but | |
76 | other server implementations can enforce this limit." */ | |
77 | if (max_vcs < 2) | |
78 | max_vcs = 0xFFFF; | |
79 | ||
3f9bcca7 | 80 | spin_lock(&cifs_tcp_ses_lock); |
eca6acf9 SF |
81 | if ((ses->need_reconnect) && is_first_ses_reconnect(ses)) |
82 | goto get_vc_num_exit; /* vcnum will be zero */ | |
83 | for (i = ses->server->srv_count - 1; i < max_vcs; i++) { | |
84 | if (i == 0) /* this is the only connection, use vc 0 */ | |
85 | break; | |
86 | ||
87 | free_vc_found = 1; | |
88 | ||
89 | list_for_each(tmp, &ses->server->smb_ses_list) { | |
96daf2b0 | 90 | tmp_ses = list_entry(tmp, struct cifs_ses, |
eca6acf9 SF |
91 | smb_ses_list); |
92 | if (tmp_ses->vcnum == i) { | |
93 | free_vc_found = 0; | |
94 | break; /* found duplicate, try next vcnum */ | |
95 | } | |
96 | } | |
97 | if (free_vc_found) | |
98 | break; /* we found a vcnumber that will work - use it */ | |
99 | } | |
100 | ||
101 | if (i == 0) | |
102 | vcnum = 0; /* for most common case, ie if one smb session, use | |
103 | vc zero. Also for case when no free vcnum, zero | |
104 | is safest to send (some clients only send zero) */ | |
105 | else if (free_vc_found == 0) | |
106 | vcnum = 1; /* we can not reuse vc=0 safely, since some servers | |
107 | reset all uids on that, but 1 is ok. */ | |
108 | else | |
109 | vcnum = i; | |
110 | ses->vcnum = vcnum; | |
111 | get_vc_num_exit: | |
3f9bcca7 | 112 | spin_unlock(&cifs_tcp_ses_lock); |
eca6acf9 | 113 | |
051a2a0d | 114 | return cpu_to_le16(vcnum); |
eca6acf9 SF |
115 | } |
116 | ||
96daf2b0 | 117 | static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB) |
3979877e SF |
118 | { |
119 | __u32 capabilities = 0; | |
120 | ||
121 | /* init fields common to all four types of SessSetup */ | |
eca6acf9 SF |
122 | /* Note that offsets for first seven fields in req struct are same */ |
123 | /* in CIFS Specs so does not matter which of 3 forms of struct */ | |
124 | /* that we use in next few lines */ | |
125 | /* Note that header is initialized to zero in header_assemble */ | |
3979877e | 126 | pSMB->req.AndXCommand = 0xFF; |
c974befa JL |
127 | pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32, |
128 | CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4, | |
129 | USHRT_MAX)); | |
3979877e | 130 | pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq); |
eca6acf9 | 131 | pSMB->req.VcNumber = get_next_vcnum(ses); |
3979877e SF |
132 | |
133 | /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */ | |
134 | ||
790fe579 | 135 | /* BB verify whether signing required on neg or just on auth frame |
3979877e SF |
136 | (and NTLM case) */ |
137 | ||
138 | capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS | | |
139 | CAP_LARGE_WRITE_X | CAP_LARGE_READ_X; | |
140 | ||
38d77c50 | 141 | if (ses->server->sign) |
3979877e SF |
142 | pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
143 | ||
144 | if (ses->capabilities & CAP_UNICODE) { | |
145 | pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE; | |
146 | capabilities |= CAP_UNICODE; | |
147 | } | |
148 | if (ses->capabilities & CAP_STATUS32) { | |
149 | pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS; | |
150 | capabilities |= CAP_STATUS32; | |
151 | } | |
152 | if (ses->capabilities & CAP_DFS) { | |
153 | pSMB->req.hdr.Flags2 |= SMBFLG2_DFS; | |
154 | capabilities |= CAP_DFS; | |
155 | } | |
26f57364 | 156 | if (ses->capabilities & CAP_UNIX) |
3979877e | 157 | capabilities |= CAP_UNIX; |
3979877e | 158 | |
3979877e SF |
159 | return capabilities; |
160 | } | |
161 | ||
0d3a01fa JL |
162 | static void |
163 | unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp) | |
164 | { | |
165 | char *bcc_ptr = *pbcc_area; | |
166 | int bytes_ret = 0; | |
167 | ||
168 | /* Copy OS version */ | |
acbbb76a SF |
169 | bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32, |
170 | nls_cp); | |
0d3a01fa | 171 | bcc_ptr += 2 * bytes_ret; |
acbbb76a SF |
172 | bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release, |
173 | 32, nls_cp); | |
0d3a01fa JL |
174 | bcc_ptr += 2 * bytes_ret; |
175 | bcc_ptr += 2; /* trailing null */ | |
176 | ||
acbbb76a SF |
177 | bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS, |
178 | 32, nls_cp); | |
0d3a01fa JL |
179 | bcc_ptr += 2 * bytes_ret; |
180 | bcc_ptr += 2; /* trailing null */ | |
181 | ||
182 | *pbcc_area = bcc_ptr; | |
183 | } | |
184 | ||
96daf2b0 | 185 | static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses, |
0d3a01fa JL |
186 | const struct nls_table *nls_cp) |
187 | { | |
188 | char *bcc_ptr = *pbcc_area; | |
189 | int bytes_ret = 0; | |
190 | ||
191 | /* copy domain */ | |
192 | if (ses->domainName == NULL) { | |
193 | /* Sending null domain better than using a bogus domain name (as | |
194 | we did briefly in 2.6.18) since server will use its default */ | |
195 | *bcc_ptr = 0; | |
196 | *(bcc_ptr+1) = 0; | |
197 | bytes_ret = 0; | |
198 | } else | |
acbbb76a | 199 | bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName, |
057d6332 | 200 | CIFS_MAX_DOMAINNAME_LEN, nls_cp); |
0d3a01fa JL |
201 | bcc_ptr += 2 * bytes_ret; |
202 | bcc_ptr += 2; /* account for null terminator */ | |
203 | ||
204 | *pbcc_area = bcc_ptr; | |
205 | } | |
206 | ||
207 | ||
96daf2b0 | 208 | static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses, |
790fe579 | 209 | const struct nls_table *nls_cp) |
3979877e | 210 | { |
790fe579 | 211 | char *bcc_ptr = *pbcc_area; |
3979877e SF |
212 | int bytes_ret = 0; |
213 | ||
214 | /* BB FIXME add check that strings total less | |
215 | than 335 or will need to send them as arrays */ | |
216 | ||
0223cf0b SF |
217 | /* unicode strings, must be word aligned before the call */ |
218 | /* if ((long) bcc_ptr % 2) { | |
3979877e SF |
219 | *bcc_ptr = 0; |
220 | bcc_ptr++; | |
0223cf0b | 221 | } */ |
3979877e | 222 | /* copy user */ |
8727c8a8 | 223 | if (ses->user_name == NULL) { |
6e659c63 SF |
224 | /* null user mount */ |
225 | *bcc_ptr = 0; | |
226 | *(bcc_ptr+1) = 0; | |
301a6a31 | 227 | } else { |
acbbb76a | 228 | bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name, |
8c3a2b4c | 229 | CIFS_MAX_USERNAME_LEN, nls_cp); |
3979877e SF |
230 | } |
231 | bcc_ptr += 2 * bytes_ret; | |
232 | bcc_ptr += 2; /* account for null termination */ | |
3979877e | 233 | |
0d3a01fa JL |
234 | unicode_domain_string(&bcc_ptr, ses, nls_cp); |
235 | unicode_oslm_strings(&bcc_ptr, nls_cp); | |
3979877e SF |
236 | |
237 | *pbcc_area = bcc_ptr; | |
238 | } | |
239 | ||
96daf2b0 | 240 | static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses, |
790fe579 | 241 | const struct nls_table *nls_cp) |
3979877e | 242 | { |
790fe579 | 243 | char *bcc_ptr = *pbcc_area; |
3979877e SF |
244 | |
245 | /* copy user */ | |
246 | /* BB what about null user mounts - check that we do this BB */ | |
790fe579 | 247 | /* copy user */ |
de47a417 | 248 | if (ses->user_name != NULL) { |
8c3a2b4c SL |
249 | strncpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN); |
250 | bcc_ptr += strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN); | |
de47a417 | 251 | } |
8727c8a8 | 252 | /* else null user mount */ |
3979877e | 253 | *bcc_ptr = 0; |
790fe579 | 254 | bcc_ptr++; /* account for null termination */ |
3979877e | 255 | |
790fe579 | 256 | /* copy domain */ |
790fe579 | 257 | if (ses->domainName != NULL) { |
057d6332 CG |
258 | strncpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN); |
259 | bcc_ptr += strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN); | |
790fe579 | 260 | } /* else we will send a null domain name |
6e659c63 | 261 | so the server will default to its own domain */ |
3979877e SF |
262 | *bcc_ptr = 0; |
263 | bcc_ptr++; | |
264 | ||
265 | /* BB check for overflow here */ | |
266 | ||
267 | strcpy(bcc_ptr, "Linux version "); | |
268 | bcc_ptr += strlen("Linux version "); | |
96b644bd SH |
269 | strcpy(bcc_ptr, init_utsname()->release); |
270 | bcc_ptr += strlen(init_utsname()->release) + 1; | |
3979877e SF |
271 | |
272 | strcpy(bcc_ptr, CIFS_NETWORK_OPSYS); | |
273 | bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1; | |
274 | ||
790fe579 | 275 | *pbcc_area = bcc_ptr; |
3979877e SF |
276 | } |
277 | ||
59140797 | 278 | static void |
96daf2b0 | 279 | decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses, |
59140797 | 280 | const struct nls_table *nls_cp) |
3979877e | 281 | { |
59140797 | 282 | int len; |
790fe579 | 283 | char *data = *pbcc_area; |
3979877e | 284 | |
f96637be | 285 | cifs_dbg(FYI, "bleft %d\n", bleft); |
3979877e | 286 | |
26f57364 | 287 | kfree(ses->serverOS); |
acbbb76a | 288 | ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp); |
f96637be | 289 | cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS); |
59140797 JL |
290 | len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; |
291 | data += len; | |
292 | bleft -= len; | |
293 | if (bleft <= 0) | |
294 | return; | |
3979877e | 295 | |
26f57364 | 296 | kfree(ses->serverNOS); |
acbbb76a | 297 | ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp); |
f96637be | 298 | cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS); |
59140797 JL |
299 | len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; |
300 | data += len; | |
301 | bleft -= len; | |
302 | if (bleft <= 0) | |
303 | return; | |
790fe579 | 304 | |
26f57364 | 305 | kfree(ses->serverDomain); |
acbbb76a | 306 | ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp); |
f96637be | 307 | cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain); |
790fe579 | 308 | |
59140797 | 309 | return; |
3979877e SF |
310 | } |
311 | ||
7d066459 JL |
312 | static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft, |
313 | struct cifs_ses *ses, | |
314 | const struct nls_table *nls_cp) | |
3979877e | 315 | { |
3979877e | 316 | int len; |
790fe579 | 317 | char *bcc_ptr = *pbcc_area; |
3979877e | 318 | |
f96637be | 319 | cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft); |
50c2f753 | 320 | |
3979877e | 321 | len = strnlen(bcc_ptr, bleft); |
790fe579 | 322 | if (len >= bleft) |
7d066459 | 323 | return; |
50c2f753 | 324 | |
26f57364 | 325 | kfree(ses->serverOS); |
3979877e SF |
326 | |
327 | ses->serverOS = kzalloc(len + 1, GFP_KERNEL); | |
790fe579 | 328 | if (ses->serverOS) |
3979877e | 329 | strncpy(ses->serverOS, bcc_ptr, len); |
281e2e7d | 330 | if (strncmp(ses->serverOS, "OS/2", 4) == 0) |
f96637be | 331 | cifs_dbg(FYI, "OS/2 server\n"); |
3979877e SF |
332 | |
333 | bcc_ptr += len + 1; | |
334 | bleft -= len + 1; | |
335 | ||
336 | len = strnlen(bcc_ptr, bleft); | |
790fe579 | 337 | if (len >= bleft) |
7d066459 | 338 | return; |
3979877e | 339 | |
26f57364 | 340 | kfree(ses->serverNOS); |
3979877e SF |
341 | |
342 | ses->serverNOS = kzalloc(len + 1, GFP_KERNEL); | |
790fe579 | 343 | if (ses->serverNOS) |
3979877e SF |
344 | strncpy(ses->serverNOS, bcc_ptr, len); |
345 | ||
346 | bcc_ptr += len + 1; | |
347 | bleft -= len + 1; | |
348 | ||
790fe579 SF |
349 | len = strnlen(bcc_ptr, bleft); |
350 | if (len > bleft) | |
7d066459 | 351 | return; |
3979877e | 352 | |
9ac00b7d SF |
353 | /* No domain field in LANMAN case. Domain is |
354 | returned by old servers in the SMB negprot response */ | |
355 | /* BB For newer servers which do not support Unicode, | |
356 | but thus do return domain here we could add parsing | |
357 | for it later, but it is not very important */ | |
f96637be | 358 | cifs_dbg(FYI, "ascii: bytes left %d\n", bleft); |
3979877e SF |
359 | } |
360 | ||
5478f9ba | 361 | int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len, |
96daf2b0 | 362 | struct cifs_ses *ses) |
0b3cc858 | 363 | { |
2b149f11 SP |
364 | unsigned int tioffset; /* challenge message target info area */ |
365 | unsigned int tilen; /* challenge message target info area length */ | |
366 | ||
0b3cc858 SF |
367 | CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr; |
368 | ||
369 | if (blob_len < sizeof(CHALLENGE_MESSAGE)) { | |
f96637be | 370 | cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len); |
0b3cc858 SF |
371 | return -EINVAL; |
372 | } | |
373 | ||
374 | if (memcmp(pblob->Signature, "NTLMSSP", 8)) { | |
f96637be JP |
375 | cifs_dbg(VFS, "blob signature incorrect %s\n", |
376 | pblob->Signature); | |
0b3cc858 SF |
377 | return -EINVAL; |
378 | } | |
379 | if (pblob->MessageType != NtLmChallenge) { | |
f96637be JP |
380 | cifs_dbg(VFS, "Incorrect message type %d\n", |
381 | pblob->MessageType); | |
0b3cc858 SF |
382 | return -EINVAL; |
383 | } | |
384 | ||
d3686d54 | 385 | memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE); |
0b3cc858 SF |
386 | /* BB we could decode pblob->NegotiateFlags; some may be useful */ |
387 | /* In particular we can examine sign flags */ | |
388 | /* BB spec says that if AvId field of MsvAvTimestamp is populated then | |
389 | we must set the MIC field of the AUTHENTICATE_MESSAGE */ | |
d3686d54 | 390 | ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags); |
5443d130 SF |
391 | tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset); |
392 | tilen = le16_to_cpu(pblob->TargetInfoArray.Length); | |
4991a5fa | 393 | if (tioffset > blob_len || tioffset + tilen > blob_len) { |
f96637be JP |
394 | cifs_dbg(VFS, "tioffset + tilen too high %u + %u", |
395 | tioffset, tilen); | |
4991a5fa DC |
396 | return -EINVAL; |
397 | } | |
d3686d54 | 398 | if (tilen) { |
f7f7c185 SMP |
399 | ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen, |
400 | GFP_KERNEL); | |
d3686d54 | 401 | if (!ses->auth_key.response) { |
f96637be | 402 | cifs_dbg(VFS, "Challenge target info alloc failure"); |
2b149f11 SP |
403 | return -ENOMEM; |
404 | } | |
d3686d54 | 405 | ses->auth_key.len = tilen; |
2b149f11 SP |
406 | } |
407 | ||
0b3cc858 SF |
408 | return 0; |
409 | } | |
410 | ||
0b3cc858 SF |
411 | /* BB Move to ntlmssp.c eventually */ |
412 | ||
413 | /* We do not malloc the blob, it is passed in pbuffer, because | |
414 | it is fixed size, and small, making this approach cleaner */ | |
5478f9ba | 415 | void build_ntlmssp_negotiate_blob(unsigned char *pbuffer, |
96daf2b0 | 416 | struct cifs_ses *ses) |
0b3cc858 SF |
417 | { |
418 | NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer; | |
419 | __u32 flags; | |
420 | ||
df8fbc24 | 421 | memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE)); |
0b3cc858 SF |
422 | memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); |
423 | sec_blob->MessageType = NtLmNegotiate; | |
424 | ||
425 | /* BB is NTLMV2 session security format easier to use here? */ | |
426 | flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET | | |
427 | NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | | |
df8fbc24 | 428 | NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC; |
38d77c50 | 429 | if (ses->server->sign) { |
745e507a | 430 | flags |= NTLMSSP_NEGOTIATE_SIGN; |
d2b91521 | 431 | if (!ses->server->session_estab) |
62411ab2 | 432 | flags |= NTLMSSP_NEGOTIATE_KEY_XCH; |
d2b91521 | 433 | } |
0b3cc858 | 434 | |
df8fbc24 | 435 | sec_blob->NegotiateFlags = cpu_to_le32(flags); |
0b3cc858 SF |
436 | |
437 | sec_blob->WorkstationName.BufferOffset = 0; | |
438 | sec_blob->WorkstationName.Length = 0; | |
439 | sec_blob->WorkstationName.MaximumLength = 0; | |
440 | ||
441 | /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */ | |
442 | sec_blob->DomainName.BufferOffset = 0; | |
443 | sec_blob->DomainName.Length = 0; | |
444 | sec_blob->DomainName.MaximumLength = 0; | |
445 | } | |
446 | ||
447 | /* We do not malloc the blob, it is passed in pbuffer, because its | |
448 | maximum possible size is fixed and small, making this approach cleaner. | |
449 | This function returns the length of the data in the blob */ | |
5478f9ba | 450 | int build_ntlmssp_auth_blob(unsigned char *pbuffer, |
89f150f4 | 451 | u16 *buflen, |
96daf2b0 | 452 | struct cifs_ses *ses, |
2b149f11 | 453 | const struct nls_table *nls_cp) |
0b3cc858 | 454 | { |
2b149f11 | 455 | int rc; |
0b3cc858 SF |
456 | AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer; |
457 | __u32 flags; | |
458 | unsigned char *tmp; | |
0b3cc858 SF |
459 | |
460 | memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); | |
461 | sec_blob->MessageType = NtLmAuthenticate; | |
462 | ||
463 | flags = NTLMSSP_NEGOTIATE_56 | | |
464 | NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO | | |
465 | NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | | |
df8fbc24 | 466 | NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC; |
38d77c50 | 467 | if (ses->server->sign) { |
0b3cc858 | 468 | flags |= NTLMSSP_NEGOTIATE_SIGN; |
62411ab2 SP |
469 | if (!ses->server->session_estab) |
470 | flags |= NTLMSSP_NEGOTIATE_KEY_XCH; | |
471 | } | |
0b3cc858 SF |
472 | |
473 | tmp = pbuffer + sizeof(AUTHENTICATE_MESSAGE); | |
df8fbc24 | 474 | sec_blob->NegotiateFlags = cpu_to_le32(flags); |
0b3cc858 SF |
475 | |
476 | sec_blob->LmChallengeResponse.BufferOffset = | |
477 | cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE)); | |
478 | sec_blob->LmChallengeResponse.Length = 0; | |
479 | sec_blob->LmChallengeResponse.MaximumLength = 0; | |
480 | ||
c8e56f1f | 481 | sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer); |
21e73393 | 482 | rc = setup_ntlmv2_rsp(ses, nls_cp); |
2b149f11 | 483 | if (rc) { |
f96637be | 484 | cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc); |
2b149f11 SP |
485 | goto setup_ntlmv2_ret; |
486 | } | |
21e73393 SP |
487 | memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE, |
488 | ses->auth_key.len - CIFS_SESS_KEY_SIZE); | |
489 | tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE; | |
c8e56f1f | 490 | |
21e73393 SP |
491 | sec_blob->NtChallengeResponse.Length = |
492 | cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); | |
2b149f11 | 493 | sec_blob->NtChallengeResponse.MaximumLength = |
21e73393 | 494 | cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); |
0b3cc858 SF |
495 | |
496 | if (ses->domainName == NULL) { | |
497 | sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer); | |
498 | sec_blob->DomainName.Length = 0; | |
499 | sec_blob->DomainName.MaximumLength = 0; | |
500 | tmp += 2; | |
501 | } else { | |
502 | int len; | |
acbbb76a | 503 | len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName, |
8c3a2b4c | 504 | CIFS_MAX_USERNAME_LEN, nls_cp); |
0b3cc858 | 505 | len *= 2; /* unicode is 2 bytes each */ |
0b3cc858 SF |
506 | sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer); |
507 | sec_blob->DomainName.Length = cpu_to_le16(len); | |
508 | sec_blob->DomainName.MaximumLength = cpu_to_le16(len); | |
509 | tmp += len; | |
510 | } | |
511 | ||
8727c8a8 | 512 | if (ses->user_name == NULL) { |
0b3cc858 SF |
513 | sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer); |
514 | sec_blob->UserName.Length = 0; | |
515 | sec_blob->UserName.MaximumLength = 0; | |
516 | tmp += 2; | |
517 | } else { | |
518 | int len; | |
acbbb76a | 519 | len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name, |
8c3a2b4c | 520 | CIFS_MAX_USERNAME_LEN, nls_cp); |
0b3cc858 | 521 | len *= 2; /* unicode is 2 bytes each */ |
0b3cc858 SF |
522 | sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer); |
523 | sec_blob->UserName.Length = cpu_to_le16(len); | |
524 | sec_blob->UserName.MaximumLength = cpu_to_le16(len); | |
525 | tmp += len; | |
526 | } | |
527 | ||
528 | sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - pbuffer); | |
529 | sec_blob->WorkstationName.Length = 0; | |
530 | sec_blob->WorkstationName.MaximumLength = 0; | |
531 | tmp += 2; | |
532 | ||
df8fbc24 SP |
533 | if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) || |
534 | (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) | |
535 | && !calc_seckey(ses)) { | |
d3686d54 | 536 | memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); |
d2b91521 SP |
537 | sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer); |
538 | sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE); | |
539 | sec_blob->SessionKey.MaximumLength = | |
540 | cpu_to_le16(CIFS_CPHTXT_SIZE); | |
541 | tmp += CIFS_CPHTXT_SIZE; | |
542 | } else { | |
543 | sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer); | |
544 | sec_blob->SessionKey.Length = 0; | |
545 | sec_blob->SessionKey.MaximumLength = 0; | |
546 | } | |
2b149f11 SP |
547 | |
548 | setup_ntlmv2_ret: | |
89f150f4 SP |
549 | *buflen = tmp - pbuffer; |
550 | return rc; | |
0b3cc858 | 551 | } |
0b3cc858 | 552 | |
3f618223 JL |
553 | enum securityEnum |
554 | select_sectype(struct TCP_Server_Info *server, enum securityEnum requested) | |
555 | { | |
556 | switch (server->negflavor) { | |
557 | case CIFS_NEGFLAVOR_EXTENDED: | |
558 | switch (requested) { | |
559 | case Kerberos: | |
560 | case RawNTLMSSP: | |
561 | return requested; | |
562 | case Unspecified: | |
563 | if (server->sec_ntlmssp && | |
564 | (global_secflags & CIFSSEC_MAY_NTLMSSP)) | |
565 | return RawNTLMSSP; | |
566 | if ((server->sec_kerberos || server->sec_mskerberos) && | |
567 | (global_secflags & CIFSSEC_MAY_KRB5)) | |
568 | return Kerberos; | |
569 | /* Fallthrough */ | |
570 | default: | |
571 | return Unspecified; | |
572 | } | |
573 | case CIFS_NEGFLAVOR_UNENCAP: | |
574 | switch (requested) { | |
575 | case NTLM: | |
576 | case NTLMv2: | |
577 | return requested; | |
578 | case Unspecified: | |
579 | if (global_secflags & CIFSSEC_MAY_NTLMV2) | |
580 | return NTLMv2; | |
581 | if (global_secflags & CIFSSEC_MAY_NTLM) | |
582 | return NTLM; | |
583 | /* Fallthrough */ | |
584 | default: | |
585 | return Unspecified; | |
586 | } | |
587 | case CIFS_NEGFLAVOR_LANMAN: | |
588 | switch (requested) { | |
589 | case LANMAN: | |
590 | return requested; | |
591 | case Unspecified: | |
592 | if (global_secflags & CIFSSEC_MAY_LANMAN) | |
593 | return LANMAN; | |
594 | /* Fallthrough */ | |
595 | default: | |
596 | return Unspecified; | |
597 | } | |
598 | default: | |
599 | return Unspecified; | |
600 | } | |
601 | } | |
602 | ||
790fe579 | 603 | int |
58c45c58 | 604 | CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses, |
ebe6aa5a | 605 | const struct nls_table *nls_cp) |
3979877e SF |
606 | { |
607 | int rc = 0; | |
608 | int wct; | |
3979877e SF |
609 | struct smb_hdr *smb_buf; |
610 | char *bcc_ptr; | |
750d1151 | 611 | char *str_area; |
3979877e SF |
612 | SESSION_SETUP_ANDX *pSMB; |
613 | __u32 capabilities; | |
690c522f | 614 | __u16 count; |
2442421b SF |
615 | int resp_buf_type; |
616 | struct kvec iov[3]; | |
3979877e | 617 | enum securityEnum type; |
690c522f | 618 | __u16 action, bytes_remaining; |
2442421b | 619 | struct key *spnego_key = NULL; |
0b3cc858 | 620 | __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */ |
89f150f4 | 621 | u16 blob_len; |
2b149f11 | 622 | char *ntlmsspblob = NULL; |
254e55ed | 623 | |
3534b850 JL |
624 | if (ses == NULL) { |
625 | WARN(1, "%s: ses == NULL!", __func__); | |
3979877e | 626 | return -EINVAL; |
3534b850 | 627 | } |
3979877e | 628 | |
3f618223 | 629 | type = select_sectype(ses->server, ses->sectype); |
f96637be | 630 | cifs_dbg(FYI, "sess setup type %d\n", type); |
3f618223 | 631 | if (type == Unspecified) { |
d4e63bd6 SP |
632 | cifs_dbg(VFS, |
633 | "Unable to select appropriate authentication method!"); | |
3f618223 JL |
634 | return -EINVAL; |
635 | } | |
636 | ||
d3686d54 SP |
637 | if (type == RawNTLMSSP) { |
638 | /* if memory allocation is successful, caller of this function | |
639 | * frees it. | |
640 | */ | |
641 | ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL); | |
642 | if (!ses->ntlmssp) | |
643 | return -ENOMEM; | |
644 | } | |
645 | ||
0b3cc858 SF |
646 | ssetup_ntlmssp_authenticate: |
647 | if (phase == NtLmChallenge) | |
648 | phase = NtLmAuthenticate; /* if ntlmssp, now final phase */ | |
649 | ||
790fe579 | 650 | if (type == LANMAN) { |
3979877e SF |
651 | #ifndef CONFIG_CIFS_WEAK_PW_HASH |
652 | /* LANMAN and plaintext are less secure and off by default. | |
653 | So we make this explicitly be turned on in kconfig (in the | |
654 | build) and turned on at runtime (changed from the default) | |
655 | in proc/fs/cifs or via mount parm. Unfortunately this is | |
656 | needed for old Win (e.g. Win95), some obscure NAS and OS/2 */ | |
657 | return -EOPNOTSUPP; | |
658 | #endif | |
659 | wct = 10; /* lanman 2 style sessionsetup */ | |
790fe579 | 660 | } else if ((type == NTLM) || (type == NTLMv2)) { |
9312f675 | 661 | /* For NTLMv2 failures eventually may need to retry NTLM */ |
3979877e | 662 | wct = 13; /* old style NTLM sessionsetup */ |
790fe579 | 663 | } else /* same size: negotiate or auth, NTLMSSP or extended security */ |
3979877e SF |
664 | wct = 12; |
665 | ||
666 | rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses, | |
667 | (void **)&smb_buf); | |
790fe579 | 668 | if (rc) |
3979877e SF |
669 | return rc; |
670 | ||
671 | pSMB = (SESSION_SETUP_ANDX *)smb_buf; | |
672 | ||
673 | capabilities = cifs_ssetup_hdr(ses, pSMB); | |
750d1151 | 674 | |
2442421b SF |
675 | /* we will send the SMB in three pieces: |
676 | a fixed length beginning part, an optional | |
677 | SPNEGO blob (which can be zero length), and a | |
678 | last part which will include the strings | |
679 | and rest of bcc area. This allows us to avoid | |
680 | a large buffer 17K allocation */ | |
790fe579 | 681 | iov[0].iov_base = (char *)pSMB; |
be8e3b00 | 682 | iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4; |
750d1151 | 683 | |
2442421b SF |
684 | /* setting this here allows the code at the end of the function |
685 | to free the request buffer if there's an error */ | |
686 | resp_buf_type = CIFS_SMALL_BUFFER; | |
687 | ||
750d1151 SF |
688 | /* 2000 big enough to fit max user, domain, NOS name etc. */ |
689 | str_area = kmalloc(2000, GFP_KERNEL); | |
5e6e6232 | 690 | if (str_area == NULL) { |
2442421b SF |
691 | rc = -ENOMEM; |
692 | goto ssetup_exit; | |
5e6e6232 | 693 | } |
750d1151 | 694 | bcc_ptr = str_area; |
3979877e | 695 | |
2442421b SF |
696 | iov[1].iov_base = NULL; |
697 | iov[1].iov_len = 0; | |
698 | ||
790fe579 | 699 | if (type == LANMAN) { |
3979877e | 700 | #ifdef CONFIG_CIFS_WEAK_PW_HASH |
5e640927 | 701 | char lnm_session_key[CIFS_AUTH_RESP_SIZE]; |
3979877e | 702 | |
c76da9da SF |
703 | pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE; |
704 | ||
3979877e SF |
705 | /* no capabilities flags in old lanman negotiation */ |
706 | ||
5e640927 | 707 | pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE); |
3979877e | 708 | |
d3ba50b1 SP |
709 | /* Calculate hash with password and copy into bcc_ptr. |
710 | * Encryption Key (stored as in cryptkey) gets used if the | |
711 | * security mode bit in Negottiate Protocol response states | |
712 | * to use challenge/response method (i.e. Password bit is 1). | |
713 | */ | |
714 | ||
43988d76 | 715 | rc = calc_lanman_hash(ses->password, ses->server->cryptkey, |
96daf2b0 | 716 | ses->server->sec_mode & SECMODE_PW_ENCRYPT ? |
4e53a3fb JL |
717 | true : false, lnm_session_key); |
718 | ||
5e640927 SP |
719 | memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE); |
720 | bcc_ptr += CIFS_AUTH_RESP_SIZE; | |
3979877e SF |
721 | |
722 | /* can not sign if LANMAN negotiated so no need | |
723 | to calculate signing key? but what if server | |
724 | changed to do higher than lanman dialect and | |
725 | we reconnected would we ever calc signing_key? */ | |
726 | ||
f96637be | 727 | cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n"); |
3979877e SF |
728 | /* Unicode not allowed for LANMAN dialects */ |
729 | ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); | |
790fe579 | 730 | #endif |
3979877e | 731 | } else if (type == NTLM) { |
3979877e SF |
732 | pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); |
733 | pSMB->req_no_secext.CaseInsensitivePasswordLength = | |
21e73393 | 734 | cpu_to_le16(CIFS_AUTH_RESP_SIZE); |
3979877e | 735 | pSMB->req_no_secext.CaseSensitivePasswordLength = |
21e73393 SP |
736 | cpu_to_le16(CIFS_AUTH_RESP_SIZE); |
737 | ||
738 | /* calculate ntlm response and session key */ | |
9ef5992e | 739 | rc = setup_ntlm_response(ses, nls_cp); |
21e73393 | 740 | if (rc) { |
f96637be JP |
741 | cifs_dbg(VFS, "Error %d during NTLM authentication\n", |
742 | rc); | |
21e73393 SP |
743 | goto ssetup_exit; |
744 | } | |
50c2f753 | 745 | |
21e73393 SP |
746 | /* copy ntlm response */ |
747 | memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, | |
748 | CIFS_AUTH_RESP_SIZE); | |
749 | bcc_ptr += CIFS_AUTH_RESP_SIZE; | |
750 | memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, | |
751 | CIFS_AUTH_RESP_SIZE); | |
752 | bcc_ptr += CIFS_AUTH_RESP_SIZE; | |
3979877e | 753 | |
790fe579 | 754 | if (ses->capabilities & CAP_UNICODE) { |
0223cf0b SF |
755 | /* unicode strings must be word aligned */ |
756 | if (iov[0].iov_len % 2) { | |
757 | *bcc_ptr = 0; | |
790fe579 SF |
758 | bcc_ptr++; |
759 | } | |
7c7b25bc | 760 | unicode_ssetup_strings(&bcc_ptr, ses, nls_cp); |
0223cf0b | 761 | } else |
7c7b25bc SF |
762 | ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); |
763 | } else if (type == NTLMv2) { | |
7c7b25bc SF |
764 | pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); |
765 | ||
766 | /* LM2 password would be here if we supported it */ | |
767 | pSMB->req_no_secext.CaseInsensitivePasswordLength = 0; | |
7c7b25bc | 768 | |
21e73393 SP |
769 | /* calculate nlmv2 response and session key */ |
770 | rc = setup_ntlmv2_rsp(ses, nls_cp); | |
2b149f11 | 771 | if (rc) { |
f96637be JP |
772 | cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", |
773 | rc); | |
2b149f11 SP |
774 | goto ssetup_exit; |
775 | } | |
21e73393 SP |
776 | memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, |
777 | ses->auth_key.len - CIFS_SESS_KEY_SIZE); | |
778 | bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE; | |
779 | ||
c9928f70 SP |
780 | /* set case sensitive password length after tilen may get |
781 | * assigned, tilen is 0 otherwise. | |
782 | */ | |
783 | pSMB->req_no_secext.CaseSensitivePasswordLength = | |
f7c5445a | 784 | cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); |
c9928f70 | 785 | |
790fe579 SF |
786 | if (ses->capabilities & CAP_UNICODE) { |
787 | if (iov[0].iov_len % 2) { | |
0223cf0b | 788 | *bcc_ptr = 0; |
26f57364 SF |
789 | bcc_ptr++; |
790 | } | |
3979877e | 791 | unicode_ssetup_strings(&bcc_ptr, ses, nls_cp); |
0223cf0b | 792 | } else |
3979877e | 793 | ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); |
26efa0ba | 794 | } else if (type == Kerberos) { |
2442421b SF |
795 | #ifdef CONFIG_CIFS_UPCALL |
796 | struct cifs_spnego_msg *msg; | |
21e73393 | 797 | |
2442421b SF |
798 | spnego_key = cifs_get_spnego_key(ses); |
799 | if (IS_ERR(spnego_key)) { | |
800 | rc = PTR_ERR(spnego_key); | |
801 | spnego_key = NULL; | |
802 | goto ssetup_exit; | |
803 | } | |
804 | ||
805 | msg = spnego_key->payload.data; | |
6ce5eecb SF |
806 | /* check version field to make sure that cifs.upcall is |
807 | sending us a response in an expected form */ | |
808 | if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) { | |
f96637be JP |
809 | cifs_dbg(VFS, "incorrect version of cifs.upcall " |
810 | "expected %d but got %d)", | |
b6b38f70 | 811 | CIFS_SPNEGO_UPCALL_VERSION, msg->version); |
6ce5eecb SF |
812 | rc = -EKEYREJECTED; |
813 | goto ssetup_exit; | |
814 | } | |
21e73393 | 815 | |
f7f7c185 SMP |
816 | ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len, |
817 | GFP_KERNEL); | |
21e73393 | 818 | if (!ses->auth_key.response) { |
d4e63bd6 SP |
819 | cifs_dbg(VFS, |
820 | "Kerberos can't allocate (%u bytes) memory", | |
821 | msg->sesskey_len); | |
21e73393 | 822 | rc = -ENOMEM; |
2442421b SF |
823 | goto ssetup_exit; |
824 | } | |
5d0d2882 | 825 | ses->auth_key.len = msg->sesskey_len; |
21e73393 | 826 | |
3979877e SF |
827 | pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; |
828 | capabilities |= CAP_EXTENDED_SECURITY; | |
829 | pSMB->req.Capabilities = cpu_to_le32(capabilities); | |
2442421b SF |
830 | iov[1].iov_base = msg->data + msg->sesskey_len; |
831 | iov[1].iov_len = msg->secblob_len; | |
832 | pSMB->req.SecurityBlobLength = cpu_to_le16(iov[1].iov_len); | |
833 | ||
834 | if (ses->capabilities & CAP_UNICODE) { | |
835 | /* unicode strings must be word aligned */ | |
28c5a02a | 836 | if ((iov[0].iov_len + iov[1].iov_len) % 2) { |
2442421b SF |
837 | *bcc_ptr = 0; |
838 | bcc_ptr++; | |
839 | } | |
840 | unicode_oslm_strings(&bcc_ptr, nls_cp); | |
841 | unicode_domain_string(&bcc_ptr, ses, nls_cp); | |
842 | } else | |
843 | /* BB: is this right? */ | |
844 | ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); | |
845 | #else /* ! CONFIG_CIFS_UPCALL */ | |
f96637be | 846 | cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n"); |
2442421b SF |
847 | rc = -ENOSYS; |
848 | goto ssetup_exit; | |
849 | #endif /* CONFIG_CIFS_UPCALL */ | |
b4d6fcf1 JL |
850 | } else if (type == RawNTLMSSP) { |
851 | if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) { | |
f96637be | 852 | cifs_dbg(VFS, "NTLMSSP requires Unicode support\n"); |
b4d6fcf1 JL |
853 | rc = -ENOSYS; |
854 | goto ssetup_exit; | |
855 | } | |
856 | ||
f96637be | 857 | cifs_dbg(FYI, "ntlmssp session setup phase %d\n", phase); |
b4d6fcf1 JL |
858 | pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; |
859 | capabilities |= CAP_EXTENDED_SECURITY; | |
860 | pSMB->req.Capabilities |= cpu_to_le32(capabilities); | |
861 | switch(phase) { | |
862 | case NtLmNegotiate: | |
863 | build_ntlmssp_negotiate_blob( | |
864 | pSMB->req.SecurityBlob, ses); | |
865 | iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE); | |
866 | iov[1].iov_base = pSMB->req.SecurityBlob; | |
867 | pSMB->req.SecurityBlobLength = | |
868 | cpu_to_le16(sizeof(NEGOTIATE_MESSAGE)); | |
869 | break; | |
870 | case NtLmAuthenticate: | |
871 | /* | |
872 | * 5 is an empirical value, large enough to hold | |
873 | * authenticate message plus max 10 of av paris, | |
874 | * domain, user, workstation names, flags, etc. | |
875 | */ | |
876 | ntlmsspblob = kzalloc( | |
877 | 5*sizeof(struct _AUTHENTICATE_MESSAGE), | |
878 | GFP_KERNEL); | |
879 | if (!ntlmsspblob) { | |
b4d6fcf1 | 880 | rc = -ENOMEM; |
0b3cc858 SF |
881 | goto ssetup_exit; |
882 | } | |
883 | ||
b4d6fcf1 JL |
884 | rc = build_ntlmssp_auth_blob(ntlmsspblob, |
885 | &blob_len, ses, nls_cp); | |
886 | if (rc) | |
0b3cc858 | 887 | goto ssetup_exit; |
b4d6fcf1 JL |
888 | iov[1].iov_len = blob_len; |
889 | iov[1].iov_base = ntlmsspblob; | |
890 | pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len); | |
891 | /* | |
892 | * Make sure that we tell the server that we are using | |
893 | * the uid that it just gave us back on the response | |
894 | * (challenge) | |
895 | */ | |
896 | smb_buf->Uid = ses->Suid; | |
897 | break; | |
898 | default: | |
f96637be | 899 | cifs_dbg(VFS, "invalid phase %d\n", phase); |
0b3cc858 SF |
900 | rc = -ENOSYS; |
901 | goto ssetup_exit; | |
902 | } | |
b4d6fcf1 JL |
903 | /* unicode strings must be word aligned */ |
904 | if ((iov[0].iov_len + iov[1].iov_len) % 2) { | |
905 | *bcc_ptr = 0; | |
906 | bcc_ptr++; | |
907 | } | |
908 | unicode_oslm_strings(&bcc_ptr, nls_cp); | |
909 | } else { | |
f96637be | 910 | cifs_dbg(VFS, "secType %d not supported!\n", type); |
2442421b SF |
911 | rc = -ENOSYS; |
912 | goto ssetup_exit; | |
3979877e SF |
913 | } |
914 | ||
2442421b SF |
915 | iov[2].iov_base = str_area; |
916 | iov[2].iov_len = (long) bcc_ptr - (long) str_area; | |
917 | ||
918 | count = iov[1].iov_len + iov[2].iov_len; | |
be8e3b00 SF |
919 | smb_buf->smb_buf_length = |
920 | cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count); | |
3979877e | 921 | |
820a803f | 922 | put_bcc(count, smb_buf); |
3979877e | 923 | |
2442421b | 924 | rc = SendReceive2(xid, ses, iov, 3 /* num_iovecs */, &resp_buf_type, |
7749981e | 925 | CIFS_LOG_ERROR); |
3979877e SF |
926 | /* SMB request buf freed in SendReceive2 */ |
927 | ||
3979877e SF |
928 | pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base; |
929 | smb_buf = (struct smb_hdr *)iov[0].iov_base; | |
930 | ||
f065fd09 PS |
931 | if ((type == RawNTLMSSP) && (resp_buf_type != CIFS_NO_BUFFER) && |
932 | (smb_buf->Status.CifsError == | |
0b3cc858 SF |
933 | cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))) { |
934 | if (phase != NtLmNegotiate) { | |
f96637be | 935 | cifs_dbg(VFS, "Unexpected more processing error\n"); |
0b3cc858 SF |
936 | goto ssetup_exit; |
937 | } | |
938 | /* NTLMSSP Negotiate sent now processing challenge (response) */ | |
939 | phase = NtLmChallenge; /* process ntlmssp challenge */ | |
940 | rc = 0; /* MORE_PROC rc is not an error here, but expected */ | |
941 | } | |
942 | if (rc) | |
943 | goto ssetup_exit; | |
944 | ||
790fe579 | 945 | if ((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) { |
3979877e | 946 | rc = -EIO; |
f96637be | 947 | cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); |
3979877e SF |
948 | goto ssetup_exit; |
949 | } | |
950 | action = le16_to_cpu(pSMB->resp.Action); | |
951 | if (action & GUEST_LOGIN) | |
f96637be | 952 | cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ |
3979877e | 953 | ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ |
f96637be | 954 | cifs_dbg(FYI, "UID = %llu\n", ses->Suid); |
3979877e SF |
955 | /* response can have either 3 or 4 word count - Samba sends 3 */ |
956 | /* and lanman response is 3 */ | |
690c522f | 957 | bytes_remaining = get_bcc(smb_buf); |
3979877e SF |
958 | bcc_ptr = pByteArea(smb_buf); |
959 | ||
790fe579 | 960 | if (smb_buf->WordCount == 4) { |
3979877e | 961 | blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); |
790fe579 | 962 | if (blob_len > bytes_remaining) { |
f96637be JP |
963 | cifs_dbg(VFS, "bad security blob length %d\n", |
964 | blob_len); | |
3979877e SF |
965 | rc = -EINVAL; |
966 | goto ssetup_exit; | |
967 | } | |
0b3cc858 SF |
968 | if (phase == NtLmChallenge) { |
969 | rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses); | |
970 | /* now goto beginning for ntlmssp authenticate phase */ | |
971 | if (rc) | |
972 | goto ssetup_exit; | |
973 | } | |
974 | bcc_ptr += blob_len; | |
3979877e | 975 | bytes_remaining -= blob_len; |
790fe579 | 976 | } |
3979877e SF |
977 | |
978 | /* BB check if Unicode and decode strings */ | |
fcda7f45 JL |
979 | if (bytes_remaining == 0) { |
980 | /* no string area to decode, do nothing */ | |
981 | } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { | |
27b87fe5 JL |
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 | } | |
59140797 | 987 | decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, nls_cp); |
27b87fe5 | 988 | } else { |
7d066459 | 989 | decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, nls_cp); |
27b87fe5 | 990 | } |
50c2f753 | 991 | |
3979877e | 992 | ssetup_exit: |
dfd15c46 | 993 | if (spnego_key) { |
00401ff7 | 994 | key_invalidate(spnego_key); |
2442421b | 995 | key_put(spnego_key); |
dfd15c46 | 996 | } |
750d1151 | 997 | kfree(str_area); |
2b149f11 SP |
998 | kfree(ntlmsspblob); |
999 | ntlmsspblob = NULL; | |
790fe579 | 1000 | if (resp_buf_type == CIFS_SMALL_BUFFER) { |
f96637be | 1001 | cifs_dbg(FYI, "ssetup freeing small buf %p\n", iov[0].iov_base); |
3979877e | 1002 | cifs_small_buf_release(iov[0].iov_base); |
790fe579 | 1003 | } else if (resp_buf_type == CIFS_LARGE_BUFFER) |
3979877e SF |
1004 | cifs_buf_release(iov[0].iov_base); |
1005 | ||
0b3cc858 SF |
1006 | /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */ |
1007 | if ((phase == NtLmChallenge) && (rc == 0)) | |
1008 | goto ssetup_ntlmssp_authenticate; | |
1009 | ||
d4e63bd6 SP |
1010 | if (!rc) { |
1011 | mutex_lock(&ses->server->srv_mutex); | |
1012 | if (!ses->server->session_estab) { | |
1013 | if (ses->server->sign) { | |
1014 | ses->server->session_key.response = | |
1015 | kmemdup(ses->auth_key.response, | |
1016 | ses->auth_key.len, GFP_KERNEL); | |
1017 | if (!ses->server->session_key.response) { | |
1018 | rc = -ENOMEM; | |
1019 | mutex_unlock(&ses->server->srv_mutex); | |
1020 | goto keycp_exit; | |
1021 | } | |
1022 | ses->server->session_key.len = | |
1023 | ses->auth_key.len; | |
1024 | } | |
1025 | ses->server->sequence_number = 0x2; | |
1026 | ses->server->session_estab = true; | |
1027 | } | |
1028 | mutex_unlock(&ses->server->srv_mutex); | |
1029 | ||
1030 | cifs_dbg(FYI, "CIFS session established successfully\n"); | |
1031 | spin_lock(&GlobalMid_Lock); | |
1032 | ses->status = CifsGood; | |
1033 | ses->need_reconnect = false; | |
1034 | spin_unlock(&GlobalMid_Lock); | |
1035 | } | |
1036 | ||
1037 | keycp_exit: | |
1038 | kfree(ses->auth_key.response); | |
1039 | ses->auth_key.response = NULL; | |
1040 | kfree(ses->ntlmssp); | |
1041 | ||
3979877e SF |
1042 | return rc; |
1043 | } |