Commit | Line | Data |
---|---|---|
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 | |
96daf2b0 | 35 | static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB) |
3979877e SF |
36 | { |
37 | __u32 capabilities = 0; | |
38 | ||
39 | /* init fields common to all four types of SessSetup */ | |
eca6acf9 SF |
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 */ | |
3979877e | 44 | pSMB->req.AndXCommand = 0xFF; |
c974befa JL |
45 | pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32, |
46 | CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4, | |
47 | USHRT_MAX)); | |
3979877e | 48 | pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq); |
9ae6cf60 | 49 | pSMB->req.VcNumber = __constant_cpu_to_le16(1); |
3979877e SF |
50 | |
51 | /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */ | |
52 | ||
790fe579 | 53 | /* BB verify whether signing required on neg or just on auth frame |
3979877e SF |
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 | ||
38d77c50 | 59 | if (ses->server->sign) |
3979877e SF |
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 | } | |
26f57364 | 74 | if (ses->capabilities & CAP_UNIX) |
3979877e | 75 | capabilities |= CAP_UNIX; |
3979877e | 76 | |
3979877e SF |
77 | return capabilities; |
78 | } | |
79 | ||
0d3a01fa JL |
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 */ | |
acbbb76a SF |
87 | bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32, |
88 | nls_cp); | |
0d3a01fa | 89 | bcc_ptr += 2 * bytes_ret; |
acbbb76a SF |
90 | bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release, |
91 | 32, nls_cp); | |
0d3a01fa JL |
92 | bcc_ptr += 2 * bytes_ret; |
93 | bcc_ptr += 2; /* trailing null */ | |
94 | ||
acbbb76a SF |
95 | bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS, |
96 | 32, nls_cp); | |
0d3a01fa JL |
97 | bcc_ptr += 2 * bytes_ret; |
98 | bcc_ptr += 2; /* trailing null */ | |
99 | ||
100 | *pbcc_area = bcc_ptr; | |
101 | } | |
102 | ||
96daf2b0 | 103 | static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses, |
0d3a01fa JL |
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 | |
acbbb76a | 117 | bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName, |
057d6332 | 118 | CIFS_MAX_DOMAINNAME_LEN, nls_cp); |
0d3a01fa JL |
119 | bcc_ptr += 2 * bytes_ret; |
120 | bcc_ptr += 2; /* account for null terminator */ | |
121 | ||
122 | *pbcc_area = bcc_ptr; | |
123 | } | |
124 | ||
125 | ||
96daf2b0 | 126 | static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses, |
790fe579 | 127 | const struct nls_table *nls_cp) |
3979877e | 128 | { |
790fe579 | 129 | char *bcc_ptr = *pbcc_area; |
3979877e SF |
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 | ||
0223cf0b SF |
135 | /* unicode strings, must be word aligned before the call */ |
136 | /* if ((long) bcc_ptr % 2) { | |
3979877e SF |
137 | *bcc_ptr = 0; |
138 | bcc_ptr++; | |
0223cf0b | 139 | } */ |
3979877e | 140 | /* copy user */ |
8727c8a8 | 141 | if (ses->user_name == NULL) { |
6e659c63 SF |
142 | /* null user mount */ |
143 | *bcc_ptr = 0; | |
144 | *(bcc_ptr+1) = 0; | |
301a6a31 | 145 | } else { |
acbbb76a | 146 | bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name, |
8c3a2b4c | 147 | CIFS_MAX_USERNAME_LEN, nls_cp); |
3979877e SF |
148 | } |
149 | bcc_ptr += 2 * bytes_ret; | |
150 | bcc_ptr += 2; /* account for null termination */ | |
3979877e | 151 | |
0d3a01fa JL |
152 | unicode_domain_string(&bcc_ptr, ses, nls_cp); |
153 | unicode_oslm_strings(&bcc_ptr, nls_cp); | |
3979877e SF |
154 | |
155 | *pbcc_area = bcc_ptr; | |
156 | } | |
157 | ||
96daf2b0 | 158 | static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses, |
790fe579 | 159 | const struct nls_table *nls_cp) |
3979877e | 160 | { |
790fe579 | 161 | char *bcc_ptr = *pbcc_area; |
3979877e SF |
162 | |
163 | /* copy user */ | |
164 | /* BB what about null user mounts - check that we do this BB */ | |
790fe579 | 165 | /* copy user */ |
de47a417 | 166 | if (ses->user_name != NULL) { |
8c3a2b4c SL |
167 | strncpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN); |
168 | bcc_ptr += strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN); | |
de47a417 | 169 | } |
8727c8a8 | 170 | /* else null user mount */ |
3979877e | 171 | *bcc_ptr = 0; |
790fe579 | 172 | bcc_ptr++; /* account for null termination */ |
3979877e | 173 | |
790fe579 | 174 | /* copy domain */ |
790fe579 | 175 | if (ses->domainName != NULL) { |
057d6332 CG |
176 | strncpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN); |
177 | bcc_ptr += strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN); | |
790fe579 | 178 | } /* else we will send a null domain name |
6e659c63 | 179 | so the server will default to its own domain */ |
3979877e SF |
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 "); | |
96b644bd SH |
187 | strcpy(bcc_ptr, init_utsname()->release); |
188 | bcc_ptr += strlen(init_utsname()->release) + 1; | |
3979877e SF |
189 | |
190 | strcpy(bcc_ptr, CIFS_NETWORK_OPSYS); | |
191 | bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1; | |
192 | ||
790fe579 | 193 | *pbcc_area = bcc_ptr; |
3979877e SF |
194 | } |
195 | ||
59140797 | 196 | static void |
96daf2b0 | 197 | decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses, |
59140797 | 198 | const struct nls_table *nls_cp) |
3979877e | 199 | { |
59140797 | 200 | int len; |
790fe579 | 201 | char *data = *pbcc_area; |
3979877e | 202 | |
f96637be | 203 | cifs_dbg(FYI, "bleft %d\n", bleft); |
3979877e | 204 | |
26f57364 | 205 | kfree(ses->serverOS); |
acbbb76a | 206 | ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp); |
f96637be | 207 | cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS); |
59140797 JL |
208 | len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; |
209 | data += len; | |
210 | bleft -= len; | |
211 | if (bleft <= 0) | |
212 | return; | |
3979877e | 213 | |
26f57364 | 214 | kfree(ses->serverNOS); |
acbbb76a | 215 | ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp); |
f96637be | 216 | cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS); |
59140797 JL |
217 | len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; |
218 | data += len; | |
219 | bleft -= len; | |
220 | if (bleft <= 0) | |
221 | return; | |
790fe579 | 222 | |
26f57364 | 223 | kfree(ses->serverDomain); |
acbbb76a | 224 | ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp); |
f96637be | 225 | cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain); |
790fe579 | 226 | |
59140797 | 227 | return; |
3979877e SF |
228 | } |
229 | ||
7d066459 JL |
230 | static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft, |
231 | struct cifs_ses *ses, | |
232 | const struct nls_table *nls_cp) | |
3979877e | 233 | { |
3979877e | 234 | int len; |
790fe579 | 235 | char *bcc_ptr = *pbcc_area; |
3979877e | 236 | |
f96637be | 237 | cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft); |
50c2f753 | 238 | |
3979877e | 239 | len = strnlen(bcc_ptr, bleft); |
790fe579 | 240 | if (len >= bleft) |
7d066459 | 241 | return; |
50c2f753 | 242 | |
26f57364 | 243 | kfree(ses->serverOS); |
3979877e SF |
244 | |
245 | ses->serverOS = kzalloc(len + 1, GFP_KERNEL); | |
790fe579 | 246 | if (ses->serverOS) |
3979877e | 247 | strncpy(ses->serverOS, bcc_ptr, len); |
281e2e7d | 248 | if (strncmp(ses->serverOS, "OS/2", 4) == 0) |
f96637be | 249 | cifs_dbg(FYI, "OS/2 server\n"); |
3979877e SF |
250 | |
251 | bcc_ptr += len + 1; | |
252 | bleft -= len + 1; | |
253 | ||
254 | len = strnlen(bcc_ptr, bleft); | |
790fe579 | 255 | if (len >= bleft) |
7d066459 | 256 | return; |
3979877e | 257 | |
26f57364 | 258 | kfree(ses->serverNOS); |
3979877e SF |
259 | |
260 | ses->serverNOS = kzalloc(len + 1, GFP_KERNEL); | |
790fe579 | 261 | if (ses->serverNOS) |
3979877e SF |
262 | strncpy(ses->serverNOS, bcc_ptr, len); |
263 | ||
264 | bcc_ptr += len + 1; | |
265 | bleft -= len + 1; | |
266 | ||
790fe579 SF |
267 | len = strnlen(bcc_ptr, bleft); |
268 | if (len > bleft) | |
7d066459 | 269 | return; |
3979877e | 270 | |
9ac00b7d SF |
271 | /* No domain field in LANMAN case. Domain is |
272 | returned by old servers in the SMB negprot response */ | |
273 | /* BB For newer servers which do not support Unicode, | |
274 | but thus do return domain here we could add parsing | |
275 | for it later, but it is not very important */ | |
f96637be | 276 | cifs_dbg(FYI, "ascii: bytes left %d\n", bleft); |
3979877e SF |
277 | } |
278 | ||
5478f9ba | 279 | int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len, |
96daf2b0 | 280 | struct cifs_ses *ses) |
0b3cc858 | 281 | { |
2b149f11 SP |
282 | unsigned int tioffset; /* challenge message target info area */ |
283 | unsigned int tilen; /* challenge message target info area length */ | |
284 | ||
0b3cc858 SF |
285 | CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr; |
286 | ||
287 | if (blob_len < sizeof(CHALLENGE_MESSAGE)) { | |
f96637be | 288 | cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len); |
0b3cc858 SF |
289 | return -EINVAL; |
290 | } | |
291 | ||
292 | if (memcmp(pblob->Signature, "NTLMSSP", 8)) { | |
f96637be JP |
293 | cifs_dbg(VFS, "blob signature incorrect %s\n", |
294 | pblob->Signature); | |
0b3cc858 SF |
295 | return -EINVAL; |
296 | } | |
297 | if (pblob->MessageType != NtLmChallenge) { | |
f96637be JP |
298 | cifs_dbg(VFS, "Incorrect message type %d\n", |
299 | pblob->MessageType); | |
0b3cc858 SF |
300 | return -EINVAL; |
301 | } | |
302 | ||
d3686d54 | 303 | memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE); |
0b3cc858 SF |
304 | /* BB we could decode pblob->NegotiateFlags; some may be useful */ |
305 | /* In particular we can examine sign flags */ | |
306 | /* BB spec says that if AvId field of MsvAvTimestamp is populated then | |
307 | we must set the MIC field of the AUTHENTICATE_MESSAGE */ | |
d3686d54 | 308 | ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags); |
5443d130 SF |
309 | tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset); |
310 | tilen = le16_to_cpu(pblob->TargetInfoArray.Length); | |
4991a5fa | 311 | if (tioffset > blob_len || tioffset + tilen > blob_len) { |
f96637be JP |
312 | cifs_dbg(VFS, "tioffset + tilen too high %u + %u", |
313 | tioffset, tilen); | |
4991a5fa DC |
314 | return -EINVAL; |
315 | } | |
d3686d54 | 316 | if (tilen) { |
f7f7c185 SMP |
317 | ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen, |
318 | GFP_KERNEL); | |
d3686d54 | 319 | if (!ses->auth_key.response) { |
f96637be | 320 | cifs_dbg(VFS, "Challenge target info alloc failure"); |
2b149f11 SP |
321 | return -ENOMEM; |
322 | } | |
d3686d54 | 323 | ses->auth_key.len = tilen; |
2b149f11 SP |
324 | } |
325 | ||
0b3cc858 SF |
326 | return 0; |
327 | } | |
328 | ||
0b3cc858 SF |
329 | /* BB Move to ntlmssp.c eventually */ |
330 | ||
331 | /* We do not malloc the blob, it is passed in pbuffer, because | |
332 | it is fixed size, and small, making this approach cleaner */ | |
5478f9ba | 333 | void build_ntlmssp_negotiate_blob(unsigned char *pbuffer, |
96daf2b0 | 334 | struct cifs_ses *ses) |
0b3cc858 SF |
335 | { |
336 | NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer; | |
337 | __u32 flags; | |
338 | ||
df8fbc24 | 339 | memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE)); |
0b3cc858 SF |
340 | memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); |
341 | sec_blob->MessageType = NtLmNegotiate; | |
342 | ||
343 | /* BB is NTLMV2 session security format easier to use here? */ | |
344 | flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET | | |
345 | NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | | |
df8fbc24 | 346 | NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC; |
38d77c50 | 347 | if (ses->server->sign) { |
745e507a | 348 | flags |= NTLMSSP_NEGOTIATE_SIGN; |
5c234aa5 SP |
349 | if (!ses->server->session_estab || |
350 | ses->ntlmssp->sesskey_per_smbsess) | |
62411ab2 | 351 | flags |= NTLMSSP_NEGOTIATE_KEY_XCH; |
d2b91521 | 352 | } |
0b3cc858 | 353 | |
df8fbc24 | 354 | sec_blob->NegotiateFlags = cpu_to_le32(flags); |
0b3cc858 SF |
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 | /* We do not malloc the blob, it is passed in pbuffer, because its | |
367 | maximum possible size is fixed and small, making this approach cleaner. | |
368 | This function returns the length of the data in the blob */ | |
5478f9ba | 369 | int build_ntlmssp_auth_blob(unsigned char *pbuffer, |
89f150f4 | 370 | u16 *buflen, |
96daf2b0 | 371 | struct cifs_ses *ses, |
2b149f11 | 372 | const struct nls_table *nls_cp) |
0b3cc858 | 373 | { |
2b149f11 | 374 | int rc; |
0b3cc858 SF |
375 | AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer; |
376 | __u32 flags; | |
377 | unsigned char *tmp; | |
0b3cc858 SF |
378 | |
379 | memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); | |
380 | sec_blob->MessageType = NtLmAuthenticate; | |
381 | ||
382 | flags = NTLMSSP_NEGOTIATE_56 | | |
383 | NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO | | |
384 | NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | | |
df8fbc24 | 385 | NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC; |
38d77c50 | 386 | if (ses->server->sign) { |
0b3cc858 | 387 | flags |= NTLMSSP_NEGOTIATE_SIGN; |
5c234aa5 SP |
388 | if (!ses->server->session_estab || |
389 | ses->ntlmssp->sesskey_per_smbsess) | |
62411ab2 SP |
390 | flags |= NTLMSSP_NEGOTIATE_KEY_XCH; |
391 | } | |
0b3cc858 SF |
392 | |
393 | tmp = pbuffer + sizeof(AUTHENTICATE_MESSAGE); | |
df8fbc24 | 394 | sec_blob->NegotiateFlags = cpu_to_le32(flags); |
0b3cc858 SF |
395 | |
396 | sec_blob->LmChallengeResponse.BufferOffset = | |
397 | cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE)); | |
398 | sec_blob->LmChallengeResponse.Length = 0; | |
399 | sec_blob->LmChallengeResponse.MaximumLength = 0; | |
400 | ||
c8e56f1f | 401 | sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer); |
21e73393 | 402 | rc = setup_ntlmv2_rsp(ses, nls_cp); |
2b149f11 | 403 | if (rc) { |
f96637be | 404 | cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc); |
2b149f11 SP |
405 | goto setup_ntlmv2_ret; |
406 | } | |
21e73393 SP |
407 | memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE, |
408 | ses->auth_key.len - CIFS_SESS_KEY_SIZE); | |
409 | tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE; | |
c8e56f1f | 410 | |
21e73393 SP |
411 | sec_blob->NtChallengeResponse.Length = |
412 | cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); | |
2b149f11 | 413 | sec_blob->NtChallengeResponse.MaximumLength = |
21e73393 | 414 | cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); |
0b3cc858 SF |
415 | |
416 | if (ses->domainName == NULL) { | |
417 | sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer); | |
418 | sec_blob->DomainName.Length = 0; | |
419 | sec_blob->DomainName.MaximumLength = 0; | |
420 | tmp += 2; | |
421 | } else { | |
422 | int len; | |
acbbb76a | 423 | len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName, |
8c3a2b4c | 424 | CIFS_MAX_USERNAME_LEN, nls_cp); |
0b3cc858 | 425 | len *= 2; /* unicode is 2 bytes each */ |
0b3cc858 SF |
426 | sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer); |
427 | sec_blob->DomainName.Length = cpu_to_le16(len); | |
428 | sec_blob->DomainName.MaximumLength = cpu_to_le16(len); | |
429 | tmp += len; | |
430 | } | |
431 | ||
8727c8a8 | 432 | if (ses->user_name == NULL) { |
0b3cc858 SF |
433 | sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer); |
434 | sec_blob->UserName.Length = 0; | |
435 | sec_blob->UserName.MaximumLength = 0; | |
436 | tmp += 2; | |
437 | } else { | |
438 | int len; | |
acbbb76a | 439 | len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name, |
8c3a2b4c | 440 | CIFS_MAX_USERNAME_LEN, nls_cp); |
0b3cc858 | 441 | len *= 2; /* unicode is 2 bytes each */ |
0b3cc858 SF |
442 | sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer); |
443 | sec_blob->UserName.Length = cpu_to_le16(len); | |
444 | sec_blob->UserName.MaximumLength = cpu_to_le16(len); | |
445 | tmp += len; | |
446 | } | |
447 | ||
448 | sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - pbuffer); | |
449 | sec_blob->WorkstationName.Length = 0; | |
450 | sec_blob->WorkstationName.MaximumLength = 0; | |
451 | tmp += 2; | |
452 | ||
df8fbc24 SP |
453 | if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) || |
454 | (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) | |
455 | && !calc_seckey(ses)) { | |
d3686d54 | 456 | memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); |
d2b91521 SP |
457 | sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer); |
458 | sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE); | |
459 | sec_blob->SessionKey.MaximumLength = | |
460 | cpu_to_le16(CIFS_CPHTXT_SIZE); | |
461 | tmp += CIFS_CPHTXT_SIZE; | |
462 | } else { | |
463 | sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer); | |
464 | sec_blob->SessionKey.Length = 0; | |
465 | sec_blob->SessionKey.MaximumLength = 0; | |
466 | } | |
2b149f11 SP |
467 | |
468 | setup_ntlmv2_ret: | |
89f150f4 SP |
469 | *buflen = tmp - pbuffer; |
470 | return rc; | |
0b3cc858 | 471 | } |
0b3cc858 | 472 | |
3f618223 JL |
473 | enum securityEnum |
474 | select_sectype(struct TCP_Server_Info *server, enum securityEnum requested) | |
475 | { | |
476 | switch (server->negflavor) { | |
477 | case CIFS_NEGFLAVOR_EXTENDED: | |
478 | switch (requested) { | |
479 | case Kerberos: | |
480 | case RawNTLMSSP: | |
481 | return requested; | |
482 | case Unspecified: | |
483 | if (server->sec_ntlmssp && | |
484 | (global_secflags & CIFSSEC_MAY_NTLMSSP)) | |
485 | return RawNTLMSSP; | |
486 | if ((server->sec_kerberos || server->sec_mskerberos) && | |
487 | (global_secflags & CIFSSEC_MAY_KRB5)) | |
488 | return Kerberos; | |
489 | /* Fallthrough */ | |
490 | default: | |
491 | return Unspecified; | |
492 | } | |
493 | case CIFS_NEGFLAVOR_UNENCAP: | |
494 | switch (requested) { | |
495 | case NTLM: | |
496 | case NTLMv2: | |
497 | return requested; | |
498 | case Unspecified: | |
499 | if (global_secflags & CIFSSEC_MAY_NTLMV2) | |
500 | return NTLMv2; | |
501 | if (global_secflags & CIFSSEC_MAY_NTLM) | |
502 | return NTLM; | |
3f618223 | 503 | default: |
dde2356c SP |
504 | /* Fallthrough to attempt LANMAN authentication next */ |
505 | break; | |
3f618223 JL |
506 | } |
507 | case CIFS_NEGFLAVOR_LANMAN: | |
508 | switch (requested) { | |
509 | case LANMAN: | |
510 | return requested; | |
511 | case Unspecified: | |
512 | if (global_secflags & CIFSSEC_MAY_LANMAN) | |
513 | return LANMAN; | |
514 | /* Fallthrough */ | |
515 | default: | |
516 | return Unspecified; | |
517 | } | |
518 | default: | |
519 | return Unspecified; | |
520 | } | |
521 | } | |
522 | ||
80a0e637 SP |
523 | struct sess_data { |
524 | unsigned int xid; | |
525 | struct cifs_ses *ses; | |
526 | struct nls_table *nls_cp; | |
527 | void (*func)(struct sess_data *); | |
528 | int result; | |
529 | ||
530 | /* we will send the SMB in three pieces: | |
531 | * a fixed length beginning part, an optional | |
532 | * SPNEGO blob (which can be zero length), and a | |
533 | * last part which will include the strings | |
534 | * and rest of bcc area. This allows us to avoid | |
535 | * a large buffer 17K allocation | |
536 | */ | |
537 | int buf0_type; | |
538 | struct kvec iov[3]; | |
539 | }; | |
540 | ||
541 | static int | |
542 | sess_alloc_buffer(struct sess_data *sess_data, int wct) | |
543 | { | |
544 | int rc; | |
545 | struct cifs_ses *ses = sess_data->ses; | |
546 | struct smb_hdr *smb_buf; | |
547 | ||
548 | rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses, | |
549 | (void **)&smb_buf); | |
550 | ||
551 | if (rc) | |
552 | return rc; | |
553 | ||
554 | sess_data->iov[0].iov_base = (char *)smb_buf; | |
555 | sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4; | |
556 | /* | |
557 | * This variable will be used to clear the buffer | |
558 | * allocated above in case of any error in the calling function. | |
559 | */ | |
560 | sess_data->buf0_type = CIFS_SMALL_BUFFER; | |
561 | ||
562 | /* 2000 big enough to fit max user, domain, NOS name etc. */ | |
563 | sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL); | |
564 | if (!sess_data->iov[2].iov_base) { | |
565 | rc = -ENOMEM; | |
566 | goto out_free_smb_buf; | |
567 | } | |
568 | ||
569 | return 0; | |
570 | ||
571 | out_free_smb_buf: | |
572 | kfree(smb_buf); | |
573 | sess_data->iov[0].iov_base = NULL; | |
574 | sess_data->iov[0].iov_len = 0; | |
575 | sess_data->buf0_type = CIFS_NO_BUFFER; | |
576 | return rc; | |
577 | } | |
578 | ||
579 | static void | |
580 | sess_free_buffer(struct sess_data *sess_data) | |
581 | { | |
582 | ||
583 | free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base); | |
584 | sess_data->buf0_type = CIFS_NO_BUFFER; | |
585 | kfree(sess_data->iov[2].iov_base); | |
586 | } | |
587 | ||
588 | static int | |
589 | sess_establish_session(struct sess_data *sess_data) | |
590 | { | |
591 | struct cifs_ses *ses = sess_data->ses; | |
592 | ||
593 | mutex_lock(&ses->server->srv_mutex); | |
594 | if (!ses->server->session_estab) { | |
595 | if (ses->server->sign) { | |
596 | ses->server->session_key.response = | |
597 | kmemdup(ses->auth_key.response, | |
598 | ses->auth_key.len, GFP_KERNEL); | |
599 | if (!ses->server->session_key.response) { | |
600 | mutex_unlock(&ses->server->srv_mutex); | |
601 | return -ENOMEM; | |
602 | } | |
603 | ses->server->session_key.len = | |
604 | ses->auth_key.len; | |
605 | } | |
606 | ses->server->sequence_number = 0x2; | |
607 | ses->server->session_estab = true; | |
608 | } | |
609 | mutex_unlock(&ses->server->srv_mutex); | |
610 | ||
611 | cifs_dbg(FYI, "CIFS session established successfully\n"); | |
612 | spin_lock(&GlobalMid_Lock); | |
613 | ses->status = CifsGood; | |
614 | ses->need_reconnect = false; | |
615 | spin_unlock(&GlobalMid_Lock); | |
616 | ||
617 | return 0; | |
618 | } | |
619 | ||
620 | static int | |
621 | sess_sendreceive(struct sess_data *sess_data) | |
622 | { | |
623 | int rc; | |
624 | struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base; | |
625 | __u16 count; | |
626 | ||
627 | count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len; | |
628 | smb_buf->smb_buf_length = | |
629 | cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count); | |
630 | put_bcc(count, smb_buf); | |
631 | ||
632 | rc = SendReceive2(sess_data->xid, sess_data->ses, | |
633 | sess_data->iov, 3 /* num_iovecs */, | |
634 | &sess_data->buf0_type, | |
635 | CIFS_LOG_ERROR); | |
636 | ||
637 | return rc; | |
638 | } | |
639 | ||
640 | /* | |
641 | * LANMAN and plaintext are less secure and off by default. | |
642 | * So we make this explicitly be turned on in kconfig (in the | |
643 | * build) and turned on at runtime (changed from the default) | |
644 | * in proc/fs/cifs or via mount parm. Unfortunately this is | |
645 | * needed for old Win (e.g. Win95), some obscure NAS and OS/2 | |
646 | */ | |
647 | #ifdef CONFIG_CIFS_WEAK_PW_HASH | |
648 | static void | |
649 | sess_auth_lanman(struct sess_data *sess_data) | |
650 | { | |
651 | int rc = 0; | |
652 | struct smb_hdr *smb_buf; | |
653 | SESSION_SETUP_ANDX *pSMB; | |
654 | char *bcc_ptr; | |
655 | struct cifs_ses *ses = sess_data->ses; | |
656 | char lnm_session_key[CIFS_AUTH_RESP_SIZE]; | |
657 | __u32 capabilities; | |
658 | __u16 bytes_remaining; | |
659 | ||
660 | /* lanman 2 style sessionsetup */ | |
661 | /* wct = 10 */ | |
662 | rc = sess_alloc_buffer(sess_data, 10); | |
663 | if (rc) | |
664 | goto out; | |
665 | ||
666 | pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; | |
667 | bcc_ptr = sess_data->iov[2].iov_base; | |
668 | capabilities = cifs_ssetup_hdr(ses, pSMB); | |
669 | ||
670 | pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE; | |
671 | ||
672 | /* no capabilities flags in old lanman negotiation */ | |
673 | pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE); | |
674 | ||
675 | /* Calculate hash with password and copy into bcc_ptr. | |
676 | * Encryption Key (stored as in cryptkey) gets used if the | |
677 | * security mode bit in Negottiate Protocol response states | |
678 | * to use challenge/response method (i.e. Password bit is 1). | |
679 | */ | |
680 | rc = calc_lanman_hash(ses->password, ses->server->cryptkey, | |
681 | ses->server->sec_mode & SECMODE_PW_ENCRYPT ? | |
682 | true : false, lnm_session_key); | |
683 | ||
684 | memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE); | |
685 | bcc_ptr += CIFS_AUTH_RESP_SIZE; | |
686 | ||
687 | /* | |
688 | * can not sign if LANMAN negotiated so no need | |
689 | * to calculate signing key? but what if server | |
690 | * changed to do higher than lanman dialect and | |
691 | * we reconnected would we ever calc signing_key? | |
692 | */ | |
693 | ||
694 | cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n"); | |
695 | /* Unicode not allowed for LANMAN dialects */ | |
696 | ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); | |
697 | ||
698 | sess_data->iov[2].iov_len = (long) bcc_ptr - | |
699 | (long) sess_data->iov[2].iov_base; | |
700 | ||
701 | rc = sess_sendreceive(sess_data); | |
702 | if (rc) | |
703 | goto out; | |
704 | ||
705 | pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; | |
706 | smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; | |
707 | ||
708 | /* lanman response has a word count of 3 */ | |
709 | if (smb_buf->WordCount != 3) { | |
710 | rc = -EIO; | |
711 | cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); | |
712 | goto out; | |
713 | } | |
714 | ||
715 | if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) | |
716 | cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ | |
717 | ||
718 | ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ | |
719 | cifs_dbg(FYI, "UID = %llu\n", ses->Suid); | |
720 | ||
721 | bytes_remaining = get_bcc(smb_buf); | |
722 | bcc_ptr = pByteArea(smb_buf); | |
723 | ||
724 | /* BB check if Unicode and decode strings */ | |
725 | if (bytes_remaining == 0) { | |
726 | /* no string area to decode, do nothing */ | |
727 | } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { | |
728 | /* unicode string area must be word-aligned */ | |
729 | if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) { | |
730 | ++bcc_ptr; | |
731 | --bytes_remaining; | |
732 | } | |
733 | decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, | |
734 | sess_data->nls_cp); | |
735 | } else { | |
736 | decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, | |
737 | sess_data->nls_cp); | |
738 | } | |
739 | ||
740 | rc = sess_establish_session(sess_data); | |
741 | out: | |
742 | sess_data->result = rc; | |
743 | sess_data->func = NULL; | |
744 | sess_free_buffer(sess_data); | |
745 | } | |
746 | ||
747 | #else | |
748 | ||
749 | static void | |
750 | sess_auth_lanman(struct sess_data *sess_data) | |
751 | { | |
752 | sess_data->result = -EOPNOTSUPP; | |
753 | sess_data->func = NULL; | |
754 | } | |
755 | #endif | |
756 | ||
583cf7af SP |
757 | static void |
758 | sess_auth_ntlm(struct sess_data *sess_data) | |
759 | { | |
760 | int rc = 0; | |
761 | struct smb_hdr *smb_buf; | |
762 | SESSION_SETUP_ANDX *pSMB; | |
763 | char *bcc_ptr; | |
764 | struct cifs_ses *ses = sess_data->ses; | |
765 | __u32 capabilities; | |
766 | __u16 bytes_remaining; | |
767 | ||
768 | /* old style NTLM sessionsetup */ | |
769 | /* wct = 13 */ | |
770 | rc = sess_alloc_buffer(sess_data, 13); | |
771 | if (rc) | |
772 | goto out; | |
773 | ||
774 | pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; | |
775 | bcc_ptr = sess_data->iov[2].iov_base; | |
776 | capabilities = cifs_ssetup_hdr(ses, pSMB); | |
777 | ||
778 | pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); | |
779 | pSMB->req_no_secext.CaseInsensitivePasswordLength = | |
780 | cpu_to_le16(CIFS_AUTH_RESP_SIZE); | |
781 | pSMB->req_no_secext.CaseSensitivePasswordLength = | |
782 | cpu_to_le16(CIFS_AUTH_RESP_SIZE); | |
783 | ||
784 | /* calculate ntlm response and session key */ | |
785 | rc = setup_ntlm_response(ses, sess_data->nls_cp); | |
786 | if (rc) { | |
787 | cifs_dbg(VFS, "Error %d during NTLM authentication\n", | |
788 | rc); | |
789 | goto out; | |
790 | } | |
791 | ||
792 | /* copy ntlm response */ | |
793 | memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, | |
794 | CIFS_AUTH_RESP_SIZE); | |
795 | bcc_ptr += CIFS_AUTH_RESP_SIZE; | |
796 | memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, | |
797 | CIFS_AUTH_RESP_SIZE); | |
798 | bcc_ptr += CIFS_AUTH_RESP_SIZE; | |
799 | ||
800 | if (ses->capabilities & CAP_UNICODE) { | |
801 | /* unicode strings must be word aligned */ | |
802 | if (sess_data->iov[0].iov_len % 2) { | |
803 | *bcc_ptr = 0; | |
804 | bcc_ptr++; | |
805 | } | |
806 | unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); | |
807 | } else { | |
808 | ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); | |
809 | } | |
810 | ||
811 | ||
812 | sess_data->iov[2].iov_len = (long) bcc_ptr - | |
813 | (long) sess_data->iov[2].iov_base; | |
814 | ||
815 | rc = sess_sendreceive(sess_data); | |
816 | if (rc) | |
817 | goto out; | |
818 | ||
819 | pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; | |
820 | smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; | |
821 | ||
822 | if (smb_buf->WordCount != 3) { | |
823 | rc = -EIO; | |
824 | cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); | |
825 | goto out; | |
826 | } | |
827 | ||
828 | if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) | |
829 | cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ | |
830 | ||
831 | ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ | |
832 | cifs_dbg(FYI, "UID = %llu\n", ses->Suid); | |
833 | ||
834 | bytes_remaining = get_bcc(smb_buf); | |
835 | bcc_ptr = pByteArea(smb_buf); | |
836 | ||
837 | /* BB check if Unicode and decode strings */ | |
838 | if (bytes_remaining == 0) { | |
839 | /* no string area to decode, do nothing */ | |
840 | } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { | |
841 | /* unicode string area must be word-aligned */ | |
842 | if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) { | |
843 | ++bcc_ptr; | |
844 | --bytes_remaining; | |
845 | } | |
846 | decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, | |
847 | sess_data->nls_cp); | |
848 | } else { | |
849 | decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, | |
850 | sess_data->nls_cp); | |
851 | } | |
852 | ||
853 | rc = sess_establish_session(sess_data); | |
854 | out: | |
855 | sess_data->result = rc; | |
856 | sess_data->func = NULL; | |
857 | sess_free_buffer(sess_data); | |
858 | kfree(ses->auth_key.response); | |
859 | ses->auth_key.response = NULL; | |
860 | } | |
861 | ||
862 | static void | |
863 | sess_auth_ntlmv2(struct sess_data *sess_data) | |
864 | { | |
865 | int rc = 0; | |
866 | struct smb_hdr *smb_buf; | |
867 | SESSION_SETUP_ANDX *pSMB; | |
868 | char *bcc_ptr; | |
869 | struct cifs_ses *ses = sess_data->ses; | |
870 | __u32 capabilities; | |
871 | __u16 bytes_remaining; | |
872 | ||
873 | /* old style NTLM sessionsetup */ | |
874 | /* wct = 13 */ | |
875 | rc = sess_alloc_buffer(sess_data, 13); | |
876 | if (rc) | |
877 | goto out; | |
878 | ||
879 | pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; | |
880 | bcc_ptr = sess_data->iov[2].iov_base; | |
881 | capabilities = cifs_ssetup_hdr(ses, pSMB); | |
882 | ||
883 | pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); | |
884 | ||
885 | /* LM2 password would be here if we supported it */ | |
886 | pSMB->req_no_secext.CaseInsensitivePasswordLength = 0; | |
887 | ||
888 | /* calculate nlmv2 response and session key */ | |
889 | rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp); | |
890 | if (rc) { | |
891 | cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc); | |
892 | goto out; | |
893 | } | |
894 | ||
895 | memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, | |
896 | ses->auth_key.len - CIFS_SESS_KEY_SIZE); | |
897 | bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE; | |
898 | ||
899 | /* set case sensitive password length after tilen may get | |
900 | * assigned, tilen is 0 otherwise. | |
901 | */ | |
902 | pSMB->req_no_secext.CaseSensitivePasswordLength = | |
903 | cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); | |
904 | ||
905 | if (ses->capabilities & CAP_UNICODE) { | |
906 | if (sess_data->iov[0].iov_len % 2) { | |
907 | *bcc_ptr = 0; | |
908 | bcc_ptr++; | |
909 | } | |
910 | unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); | |
911 | } else { | |
912 | ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); | |
913 | } | |
914 | ||
915 | ||
916 | sess_data->iov[2].iov_len = (long) bcc_ptr - | |
917 | (long) sess_data->iov[2].iov_base; | |
918 | ||
919 | rc = sess_sendreceive(sess_data); | |
920 | if (rc) | |
921 | goto out; | |
922 | ||
923 | pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; | |
924 | smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; | |
925 | ||
926 | if (smb_buf->WordCount != 3) { | |
927 | rc = -EIO; | |
928 | cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); | |
929 | goto out; | |
930 | } | |
931 | ||
932 | if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) | |
933 | cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ | |
934 | ||
935 | ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ | |
936 | cifs_dbg(FYI, "UID = %llu\n", ses->Suid); | |
937 | ||
938 | bytes_remaining = get_bcc(smb_buf); | |
939 | bcc_ptr = pByteArea(smb_buf); | |
940 | ||
941 | /* BB check if Unicode and decode strings */ | |
942 | if (bytes_remaining == 0) { | |
943 | /* no string area to decode, do nothing */ | |
944 | } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { | |
945 | /* unicode string area must be word-aligned */ | |
946 | if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) { | |
947 | ++bcc_ptr; | |
948 | --bytes_remaining; | |
949 | } | |
950 | decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, | |
951 | sess_data->nls_cp); | |
952 | } else { | |
953 | decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, | |
954 | sess_data->nls_cp); | |
955 | } | |
956 | ||
957 | rc = sess_establish_session(sess_data); | |
958 | out: | |
959 | sess_data->result = rc; | |
960 | sess_data->func = NULL; | |
961 | sess_free_buffer(sess_data); | |
962 | kfree(ses->auth_key.response); | |
963 | ses->auth_key.response = NULL; | |
964 | } | |
965 | ||
966 | ||
790fe579 | 967 | int |
58c45c58 | 968 | CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses, |
ebe6aa5a | 969 | const struct nls_table *nls_cp) |
3979877e SF |
970 | { |
971 | int rc = 0; | |
972 | int wct; | |
3979877e SF |
973 | struct smb_hdr *smb_buf; |
974 | char *bcc_ptr; | |
750d1151 | 975 | char *str_area; |
3979877e SF |
976 | SESSION_SETUP_ANDX *pSMB; |
977 | __u32 capabilities; | |
690c522f | 978 | __u16 count; |
2442421b SF |
979 | int resp_buf_type; |
980 | struct kvec iov[3]; | |
3979877e | 981 | enum securityEnum type; |
690c522f | 982 | __u16 action, bytes_remaining; |
2442421b | 983 | struct key *spnego_key = NULL; |
0b3cc858 | 984 | __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */ |
89f150f4 | 985 | u16 blob_len; |
2b149f11 | 986 | char *ntlmsspblob = NULL; |
80a0e637 | 987 | struct sess_data *sess_data; |
254e55ed | 988 | |
3534b850 JL |
989 | if (ses == NULL) { |
990 | WARN(1, "%s: ses == NULL!", __func__); | |
3979877e | 991 | return -EINVAL; |
3534b850 | 992 | } |
3979877e | 993 | |
80a0e637 SP |
994 | sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL); |
995 | if (!sess_data) | |
996 | return -ENOMEM; | |
997 | sess_data->xid = xid; | |
998 | sess_data->ses = ses; | |
999 | sess_data->buf0_type = CIFS_NO_BUFFER; | |
1000 | sess_data->nls_cp = (struct nls_table *) nls_cp; | |
1001 | ||
3f618223 | 1002 | type = select_sectype(ses->server, ses->sectype); |
f96637be | 1003 | cifs_dbg(FYI, "sess setup type %d\n", type); |
3f618223 | 1004 | if (type == Unspecified) { |
d4e63bd6 SP |
1005 | cifs_dbg(VFS, |
1006 | "Unable to select appropriate authentication method!"); | |
3f618223 JL |
1007 | return -EINVAL; |
1008 | } | |
1009 | ||
80a0e637 SP |
1010 | switch (type) { |
1011 | case LANMAN: | |
1012 | sess_auth_lanman(sess_data); | |
1013 | goto out; | |
583cf7af SP |
1014 | case NTLM: |
1015 | sess_auth_ntlm(sess_data); | |
1016 | goto out; | |
1017 | case NTLMv2: | |
1018 | sess_auth_ntlmv2(sess_data); | |
1019 | goto out; | |
80a0e637 SP |
1020 | default: |
1021 | cifs_dbg(FYI, "Continuing with CIFS_SessSetup\n"); | |
1022 | } | |
1023 | ||
d3686d54 SP |
1024 | if (type == RawNTLMSSP) { |
1025 | /* if memory allocation is successful, caller of this function | |
1026 | * frees it. | |
1027 | */ | |
1028 | ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL); | |
1029 | if (!ses->ntlmssp) | |
1030 | return -ENOMEM; | |
5c234aa5 SP |
1031 | ses->ntlmssp->sesskey_per_smbsess = false; |
1032 | ||
d3686d54 SP |
1033 | } |
1034 | ||
0b3cc858 SF |
1035 | ssetup_ntlmssp_authenticate: |
1036 | if (phase == NtLmChallenge) | |
1037 | phase = NtLmAuthenticate; /* if ntlmssp, now final phase */ | |
1038 | ||
583cf7af SP |
1039 | /* same size: negotiate or auth, NTLMSSP or extended security */ |
1040 | wct = 12; | |
3979877e SF |
1041 | |
1042 | rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses, | |
1043 | (void **)&smb_buf); | |
790fe579 | 1044 | if (rc) |
3979877e SF |
1045 | return rc; |
1046 | ||
1047 | pSMB = (SESSION_SETUP_ANDX *)smb_buf; | |
1048 | ||
1049 | capabilities = cifs_ssetup_hdr(ses, pSMB); | |
750d1151 | 1050 | |
2442421b SF |
1051 | /* we will send the SMB in three pieces: |
1052 | a fixed length beginning part, an optional | |
1053 | SPNEGO blob (which can be zero length), and a | |
1054 | last part which will include the strings | |
1055 | and rest of bcc area. This allows us to avoid | |
1056 | a large buffer 17K allocation */ | |
790fe579 | 1057 | iov[0].iov_base = (char *)pSMB; |
be8e3b00 | 1058 | iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4; |
750d1151 | 1059 | |
2442421b SF |
1060 | /* setting this here allows the code at the end of the function |
1061 | to free the request buffer if there's an error */ | |
1062 | resp_buf_type = CIFS_SMALL_BUFFER; | |
1063 | ||
750d1151 SF |
1064 | /* 2000 big enough to fit max user, domain, NOS name etc. */ |
1065 | str_area = kmalloc(2000, GFP_KERNEL); | |
5e6e6232 | 1066 | if (str_area == NULL) { |
2442421b SF |
1067 | rc = -ENOMEM; |
1068 | goto ssetup_exit; | |
5e6e6232 | 1069 | } |
750d1151 | 1070 | bcc_ptr = str_area; |
3979877e | 1071 | |
2442421b SF |
1072 | iov[1].iov_base = NULL; |
1073 | iov[1].iov_len = 0; | |
1074 | ||
583cf7af | 1075 | if (type == Kerberos) { |
2442421b SF |
1076 | #ifdef CONFIG_CIFS_UPCALL |
1077 | struct cifs_spnego_msg *msg; | |
21e73393 | 1078 | |
2442421b SF |
1079 | spnego_key = cifs_get_spnego_key(ses); |
1080 | if (IS_ERR(spnego_key)) { | |
1081 | rc = PTR_ERR(spnego_key); | |
1082 | spnego_key = NULL; | |
1083 | goto ssetup_exit; | |
1084 | } | |
1085 | ||
1086 | msg = spnego_key->payload.data; | |
6ce5eecb SF |
1087 | /* check version field to make sure that cifs.upcall is |
1088 | sending us a response in an expected form */ | |
1089 | if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) { | |
f96637be JP |
1090 | cifs_dbg(VFS, "incorrect version of cifs.upcall " |
1091 | "expected %d but got %d)", | |
b6b38f70 | 1092 | CIFS_SPNEGO_UPCALL_VERSION, msg->version); |
6ce5eecb SF |
1093 | rc = -EKEYREJECTED; |
1094 | goto ssetup_exit; | |
1095 | } | |
21e73393 | 1096 | |
f7f7c185 SMP |
1097 | ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len, |
1098 | GFP_KERNEL); | |
21e73393 | 1099 | if (!ses->auth_key.response) { |
d4e63bd6 SP |
1100 | cifs_dbg(VFS, |
1101 | "Kerberos can't allocate (%u bytes) memory", | |
1102 | msg->sesskey_len); | |
21e73393 | 1103 | rc = -ENOMEM; |
2442421b SF |
1104 | goto ssetup_exit; |
1105 | } | |
5d0d2882 | 1106 | ses->auth_key.len = msg->sesskey_len; |
21e73393 | 1107 | |
3979877e SF |
1108 | pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; |
1109 | capabilities |= CAP_EXTENDED_SECURITY; | |
1110 | pSMB->req.Capabilities = cpu_to_le32(capabilities); | |
2442421b SF |
1111 | iov[1].iov_base = msg->data + msg->sesskey_len; |
1112 | iov[1].iov_len = msg->secblob_len; | |
1113 | pSMB->req.SecurityBlobLength = cpu_to_le16(iov[1].iov_len); | |
1114 | ||
1115 | if (ses->capabilities & CAP_UNICODE) { | |
1116 | /* unicode strings must be word aligned */ | |
28c5a02a | 1117 | if ((iov[0].iov_len + iov[1].iov_len) % 2) { |
2442421b SF |
1118 | *bcc_ptr = 0; |
1119 | bcc_ptr++; | |
1120 | } | |
1121 | unicode_oslm_strings(&bcc_ptr, nls_cp); | |
1122 | unicode_domain_string(&bcc_ptr, ses, nls_cp); | |
1123 | } else | |
1124 | /* BB: is this right? */ | |
1125 | ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); | |
1126 | #else /* ! CONFIG_CIFS_UPCALL */ | |
f96637be | 1127 | cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n"); |
2442421b SF |
1128 | rc = -ENOSYS; |
1129 | goto ssetup_exit; | |
1130 | #endif /* CONFIG_CIFS_UPCALL */ | |
b4d6fcf1 JL |
1131 | } else if (type == RawNTLMSSP) { |
1132 | if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) { | |
f96637be | 1133 | cifs_dbg(VFS, "NTLMSSP requires Unicode support\n"); |
b4d6fcf1 JL |
1134 | rc = -ENOSYS; |
1135 | goto ssetup_exit; | |
1136 | } | |
1137 | ||
f96637be | 1138 | cifs_dbg(FYI, "ntlmssp session setup phase %d\n", phase); |
b4d6fcf1 JL |
1139 | pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; |
1140 | capabilities |= CAP_EXTENDED_SECURITY; | |
1141 | pSMB->req.Capabilities |= cpu_to_le32(capabilities); | |
1142 | switch(phase) { | |
1143 | case NtLmNegotiate: | |
1144 | build_ntlmssp_negotiate_blob( | |
1145 | pSMB->req.SecurityBlob, ses); | |
1146 | iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE); | |
1147 | iov[1].iov_base = pSMB->req.SecurityBlob; | |
1148 | pSMB->req.SecurityBlobLength = | |
1149 | cpu_to_le16(sizeof(NEGOTIATE_MESSAGE)); | |
1150 | break; | |
1151 | case NtLmAuthenticate: | |
1152 | /* | |
1153 | * 5 is an empirical value, large enough to hold | |
1154 | * authenticate message plus max 10 of av paris, | |
1155 | * domain, user, workstation names, flags, etc. | |
1156 | */ | |
1157 | ntlmsspblob = kzalloc( | |
1158 | 5*sizeof(struct _AUTHENTICATE_MESSAGE), | |
1159 | GFP_KERNEL); | |
1160 | if (!ntlmsspblob) { | |
b4d6fcf1 | 1161 | rc = -ENOMEM; |
0b3cc858 SF |
1162 | goto ssetup_exit; |
1163 | } | |
1164 | ||
b4d6fcf1 JL |
1165 | rc = build_ntlmssp_auth_blob(ntlmsspblob, |
1166 | &blob_len, ses, nls_cp); | |
1167 | if (rc) | |
0b3cc858 | 1168 | goto ssetup_exit; |
b4d6fcf1 JL |
1169 | iov[1].iov_len = blob_len; |
1170 | iov[1].iov_base = ntlmsspblob; | |
1171 | pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len); | |
1172 | /* | |
1173 | * Make sure that we tell the server that we are using | |
1174 | * the uid that it just gave us back on the response | |
1175 | * (challenge) | |
1176 | */ | |
1177 | smb_buf->Uid = ses->Suid; | |
1178 | break; | |
1179 | default: | |
f96637be | 1180 | cifs_dbg(VFS, "invalid phase %d\n", phase); |
0b3cc858 SF |
1181 | rc = -ENOSYS; |
1182 | goto ssetup_exit; | |
1183 | } | |
b4d6fcf1 JL |
1184 | /* unicode strings must be word aligned */ |
1185 | if ((iov[0].iov_len + iov[1].iov_len) % 2) { | |
1186 | *bcc_ptr = 0; | |
1187 | bcc_ptr++; | |
1188 | } | |
1189 | unicode_oslm_strings(&bcc_ptr, nls_cp); | |
1190 | } else { | |
f96637be | 1191 | cifs_dbg(VFS, "secType %d not supported!\n", type); |
2442421b SF |
1192 | rc = -ENOSYS; |
1193 | goto ssetup_exit; | |
3979877e SF |
1194 | } |
1195 | ||
2442421b SF |
1196 | iov[2].iov_base = str_area; |
1197 | iov[2].iov_len = (long) bcc_ptr - (long) str_area; | |
1198 | ||
1199 | count = iov[1].iov_len + iov[2].iov_len; | |
be8e3b00 SF |
1200 | smb_buf->smb_buf_length = |
1201 | cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count); | |
3979877e | 1202 | |
820a803f | 1203 | put_bcc(count, smb_buf); |
3979877e | 1204 | |
2442421b | 1205 | rc = SendReceive2(xid, ses, iov, 3 /* num_iovecs */, &resp_buf_type, |
7749981e | 1206 | CIFS_LOG_ERROR); |
3979877e SF |
1207 | /* SMB request buf freed in SendReceive2 */ |
1208 | ||
3979877e SF |
1209 | pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base; |
1210 | smb_buf = (struct smb_hdr *)iov[0].iov_base; | |
1211 | ||
f065fd09 PS |
1212 | if ((type == RawNTLMSSP) && (resp_buf_type != CIFS_NO_BUFFER) && |
1213 | (smb_buf->Status.CifsError == | |
0b3cc858 SF |
1214 | cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))) { |
1215 | if (phase != NtLmNegotiate) { | |
f96637be | 1216 | cifs_dbg(VFS, "Unexpected more processing error\n"); |
0b3cc858 SF |
1217 | goto ssetup_exit; |
1218 | } | |
1219 | /* NTLMSSP Negotiate sent now processing challenge (response) */ | |
1220 | phase = NtLmChallenge; /* process ntlmssp challenge */ | |
1221 | rc = 0; /* MORE_PROC rc is not an error here, but expected */ | |
1222 | } | |
1223 | if (rc) | |
1224 | goto ssetup_exit; | |
1225 | ||
583cf7af | 1226 | if (smb_buf->WordCount != 4) { |
3979877e | 1227 | rc = -EIO; |
f96637be | 1228 | cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); |
3979877e SF |
1229 | goto ssetup_exit; |
1230 | } | |
1231 | action = le16_to_cpu(pSMB->resp.Action); | |
1232 | if (action & GUEST_LOGIN) | |
f96637be | 1233 | cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ |
3979877e | 1234 | ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ |
f96637be | 1235 | cifs_dbg(FYI, "UID = %llu\n", ses->Suid); |
3979877e SF |
1236 | /* response can have either 3 or 4 word count - Samba sends 3 */ |
1237 | /* and lanman response is 3 */ | |
690c522f | 1238 | bytes_remaining = get_bcc(smb_buf); |
3979877e SF |
1239 | bcc_ptr = pByteArea(smb_buf); |
1240 | ||
583cf7af SP |
1241 | blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); |
1242 | if (blob_len > bytes_remaining) { | |
1243 | cifs_dbg(VFS, "bad security blob length %d\n", | |
1244 | blob_len); | |
1245 | rc = -EINVAL; | |
1246 | goto ssetup_exit; | |
1247 | } | |
1248 | if (phase == NtLmChallenge) { | |
1249 | rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses); | |
1250 | if (rc) | |
3979877e | 1251 | goto ssetup_exit; |
790fe579 | 1252 | } |
583cf7af SP |
1253 | bcc_ptr += blob_len; |
1254 | bytes_remaining -= blob_len; | |
3979877e SF |
1255 | |
1256 | /* BB check if Unicode and decode strings */ | |
fcda7f45 JL |
1257 | if (bytes_remaining == 0) { |
1258 | /* no string area to decode, do nothing */ | |
1259 | } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { | |
27b87fe5 JL |
1260 | /* unicode string area must be word-aligned */ |
1261 | if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) { | |
1262 | ++bcc_ptr; | |
1263 | --bytes_remaining; | |
1264 | } | |
59140797 | 1265 | decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, nls_cp); |
27b87fe5 | 1266 | } else { |
7d066459 | 1267 | decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, nls_cp); |
27b87fe5 | 1268 | } |
50c2f753 | 1269 | |
3979877e | 1270 | ssetup_exit: |
dfd15c46 | 1271 | if (spnego_key) { |
00401ff7 | 1272 | key_invalidate(spnego_key); |
2442421b | 1273 | key_put(spnego_key); |
dfd15c46 | 1274 | } |
750d1151 | 1275 | kfree(str_area); |
2b149f11 SP |
1276 | kfree(ntlmsspblob); |
1277 | ntlmsspblob = NULL; | |
790fe579 | 1278 | if (resp_buf_type == CIFS_SMALL_BUFFER) { |
f96637be | 1279 | cifs_dbg(FYI, "ssetup freeing small buf %p\n", iov[0].iov_base); |
3979877e | 1280 | cifs_small_buf_release(iov[0].iov_base); |
790fe579 | 1281 | } else if (resp_buf_type == CIFS_LARGE_BUFFER) |
3979877e SF |
1282 | cifs_buf_release(iov[0].iov_base); |
1283 | ||
0b3cc858 SF |
1284 | /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */ |
1285 | if ((phase == NtLmChallenge) && (rc == 0)) | |
1286 | goto ssetup_ntlmssp_authenticate; | |
1287 | ||
d4e63bd6 SP |
1288 | if (!rc) { |
1289 | mutex_lock(&ses->server->srv_mutex); | |
1290 | if (!ses->server->session_estab) { | |
1291 | if (ses->server->sign) { | |
1292 | ses->server->session_key.response = | |
1293 | kmemdup(ses->auth_key.response, | |
1294 | ses->auth_key.len, GFP_KERNEL); | |
1295 | if (!ses->server->session_key.response) { | |
1296 | rc = -ENOMEM; | |
1297 | mutex_unlock(&ses->server->srv_mutex); | |
1298 | goto keycp_exit; | |
1299 | } | |
1300 | ses->server->session_key.len = | |
1301 | ses->auth_key.len; | |
1302 | } | |
1303 | ses->server->sequence_number = 0x2; | |
1304 | ses->server->session_estab = true; | |
1305 | } | |
1306 | mutex_unlock(&ses->server->srv_mutex); | |
1307 | ||
1308 | cifs_dbg(FYI, "CIFS session established successfully\n"); | |
1309 | spin_lock(&GlobalMid_Lock); | |
1310 | ses->status = CifsGood; | |
1311 | ses->need_reconnect = false; | |
1312 | spin_unlock(&GlobalMid_Lock); | |
1313 | } | |
1314 | ||
1315 | keycp_exit: | |
1316 | kfree(ses->auth_key.response); | |
1317 | ses->auth_key.response = NULL; | |
1318 | kfree(ses->ntlmssp); | |
1319 | ||
3979877e | 1320 | return rc; |
80a0e637 SP |
1321 | |
1322 | out: | |
1323 | rc = sess_data->result; | |
1324 | kfree(sess_data); | |
1325 | return rc; | |
3979877e | 1326 | } |