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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/cifsencrypt.c | |
3 | * | |
12b3b8ff | 4 | * Copyright (C) International Business Machines Corp., 2005,2006 |
1da177e4 LT |
5 | * Author(s): Steve French (sfrench@us.ibm.com) |
6 | * | |
7 | * This library is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU Lesser General Public License as published | |
9 | * by the Free Software Foundation; either version 2.1 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This library is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
15 | * the GNU Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public License | |
18 | * along with this library; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | ||
22 | #include <linux/fs.h> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
1da177e4 | 24 | #include "cifspdu.h" |
ffdd6e4d | 25 | #include "cifsglob.h" |
1da177e4 | 26 | #include "cifs_debug.h" |
1da177e4 LT |
27 | #include "cifs_unicode.h" |
28 | #include "cifsproto.h" | |
2b149f11 | 29 | #include "ntlmssp.h" |
7c7b25bc | 30 | #include <linux/ctype.h> |
6d027cfd | 31 | #include <linux/random.h> |
1da177e4 | 32 | |
157c2491 JL |
33 | /* |
34 | * Calculate and return the CIFS signature based on the mac key and SMB PDU. | |
35 | * The 16 byte signature must be allocated by the caller. Note we only use the | |
36 | * 1st eight bytes and that the smb header signature field on input contains | |
37 | * the sequence number before this function is called. Also, this function | |
38 | * should be called with the server->srv_mutex held. | |
39 | */ | |
ffdd6e4d | 40 | static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu, |
21e73393 | 41 | struct TCP_Server_Info *server, char *signature) |
1da177e4 | 42 | { |
307fbd31 | 43 | int rc; |
1da177e4 | 44 | |
21e73393 | 45 | if (cifs_pdu == NULL || signature == NULL || server == NULL) |
1da177e4 LT |
46 | return -EINVAL; |
47 | ||
307fbd31 SP |
48 | if (!server->secmech.sdescmd5) { |
49 | cERROR(1, "%s: Can't generate signature\n", __func__); | |
50 | return -1; | |
51 | } | |
52 | ||
53 | rc = crypto_shash_init(&server->secmech.sdescmd5->shash); | |
54 | if (rc) { | |
55 | cERROR(1, "%s: Oould not init md5\n", __func__); | |
56 | return rc; | |
57 | } | |
58 | ||
59 | crypto_shash_update(&server->secmech.sdescmd5->shash, | |
60 | server->session_key.response, server->session_key.len); | |
61 | ||
62 | crypto_shash_update(&server->secmech.sdescmd5->shash, | |
be8e3b00 | 63 | cifs_pdu->Protocol, be32_to_cpu(cifs_pdu->smb_buf_length)); |
307fbd31 SP |
64 | |
65 | rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature); | |
b609f06a | 66 | |
56234e27 | 67 | return 0; |
1da177e4 LT |
68 | } |
69 | ||
a0f8b4fb | 70 | /* must be called with server->srv_mutex held */ |
ffdd6e4d SF |
71 | int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server, |
72 | __u32 *pexpected_response_sequence_number) | |
1da177e4 LT |
73 | { |
74 | int rc = 0; | |
75 | char smb_signature[20]; | |
76 | ||
ffdd6e4d | 77 | if ((cifs_pdu == NULL) || (server == NULL)) |
1da177e4 LT |
78 | return -EINVAL; |
79 | ||
ffdd6e4d | 80 | if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0) |
1da177e4 LT |
81 | return rc; |
82 | ||
50c2f753 SF |
83 | cifs_pdu->Signature.Sequence.SequenceNumber = |
84 | cpu_to_le32(server->sequence_number); | |
1da177e4 | 85 | cifs_pdu->Signature.Sequence.Reserved = 0; |
50c2f753 | 86 | |
ad009ac9 SF |
87 | *pexpected_response_sequence_number = server->sequence_number++; |
88 | server->sequence_number++; | |
1da177e4 | 89 | |
21e73393 | 90 | rc = cifs_calculate_signature(cifs_pdu, server, smb_signature); |
ffdd6e4d | 91 | if (rc) |
1da177e4 LT |
92 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); |
93 | else | |
94 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
95 | ||
96 | return rc; | |
97 | } | |
98 | ||
ffdd6e4d | 99 | static int cifs_calc_signature2(const struct kvec *iov, int n_vec, |
21e73393 | 100 | struct TCP_Server_Info *server, char *signature) |
84afc29b | 101 | { |
e9917a00 | 102 | int i; |
307fbd31 | 103 | int rc; |
84afc29b | 104 | |
21e73393 | 105 | if (iov == NULL || signature == NULL || server == NULL) |
e9917a00 | 106 | return -EINVAL; |
84afc29b | 107 | |
307fbd31 SP |
108 | if (!server->secmech.sdescmd5) { |
109 | cERROR(1, "%s: Can't generate signature\n", __func__); | |
110 | return -1; | |
111 | } | |
112 | ||
113 | rc = crypto_shash_init(&server->secmech.sdescmd5->shash); | |
114 | if (rc) { | |
115 | cERROR(1, "%s: Oould not init md5\n", __func__); | |
116 | return rc; | |
117 | } | |
118 | ||
119 | crypto_shash_update(&server->secmech.sdescmd5->shash, | |
120 | server->session_key.response, server->session_key.len); | |
121 | ||
50c2f753 | 122 | for (i = 0; i < n_vec; i++) { |
745542e2 JL |
123 | if (iov[i].iov_len == 0) |
124 | continue; | |
ffdd6e4d | 125 | if (iov[i].iov_base == NULL) { |
56234e27 | 126 | cERROR(1, "null iovec entry"); |
e9917a00 | 127 | return -EIO; |
745542e2 | 128 | } |
ffdd6e4d | 129 | /* The first entry includes a length field (which does not get |
e9917a00 | 130 | signed that occupies the first 4 bytes before the header */ |
ffdd6e4d | 131 | if (i == 0) { |
63d2583f | 132 | if (iov[0].iov_len <= 8) /* cmd field at offset 9 */ |
e9917a00 | 133 | break; /* nothing to sign or corrupt header */ |
307fbd31 SP |
134 | crypto_shash_update(&server->secmech.sdescmd5->shash, |
135 | iov[i].iov_base + 4, iov[i].iov_len - 4); | |
e9917a00 | 136 | } else |
307fbd31 SP |
137 | crypto_shash_update(&server->secmech.sdescmd5->shash, |
138 | iov[i].iov_base, iov[i].iov_len); | |
e9917a00 | 139 | } |
84afc29b | 140 | |
307fbd31 | 141 | rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature); |
84afc29b | 142 | |
307fbd31 | 143 | return rc; |
84afc29b SF |
144 | } |
145 | ||
a0f8b4fb | 146 | /* must be called with server->srv_mutex held */ |
ffdd6e4d | 147 | int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server, |
63d2583f | 148 | __u32 *pexpected_response_sequence_number) |
84afc29b SF |
149 | { |
150 | int rc = 0; | |
151 | char smb_signature[20]; | |
ffdd6e4d | 152 | struct smb_hdr *cifs_pdu = iov[0].iov_base; |
84afc29b | 153 | |
ffdd6e4d | 154 | if ((cifs_pdu == NULL) || (server == NULL)) |
84afc29b SF |
155 | return -EINVAL; |
156 | ||
ffdd6e4d | 157 | if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0) |
84afc29b SF |
158 | return rc; |
159 | ||
ffdd6e4d | 160 | cifs_pdu->Signature.Sequence.SequenceNumber = |
84afc29b | 161 | cpu_to_le32(server->sequence_number); |
ffdd6e4d | 162 | cifs_pdu->Signature.Sequence.Reserved = 0; |
84afc29b | 163 | |
ffdd6e4d SF |
164 | *pexpected_response_sequence_number = server->sequence_number++; |
165 | server->sequence_number++; | |
84afc29b | 166 | |
21e73393 | 167 | rc = cifs_calc_signature2(iov, n_vec, server, smb_signature); |
ffdd6e4d SF |
168 | if (rc) |
169 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |
170 | else | |
171 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
84afc29b | 172 | |
ffdd6e4d | 173 | return rc; |
84afc29b SF |
174 | } |
175 | ||
b609f06a | 176 | int cifs_verify_signature(struct smb_hdr *cifs_pdu, |
21e73393 | 177 | struct TCP_Server_Info *server, |
ffdd6e4d | 178 | __u32 expected_sequence_number) |
1da177e4 | 179 | { |
c8e56f1f | 180 | unsigned int rc; |
1da177e4 LT |
181 | char server_response_sig[8]; |
182 | char what_we_think_sig_should_be[20]; | |
183 | ||
21e73393 | 184 | if (cifs_pdu == NULL || server == NULL) |
1da177e4 LT |
185 | return -EINVAL; |
186 | ||
9c4843ea | 187 | if (!server->session_estab) |
1da177e4 LT |
188 | return 0; |
189 | ||
190 | if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) { | |
50c2f753 | 191 | struct smb_com_lock_req *pSMB = |
ffdd6e4d SF |
192 | (struct smb_com_lock_req *)cifs_pdu; |
193 | if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) | |
1da177e4 LT |
194 | return 0; |
195 | } | |
196 | ||
50c2f753 SF |
197 | /* BB what if signatures are supposed to be on for session but |
198 | server does not send one? BB */ | |
199 | ||
1da177e4 | 200 | /* Do not need to verify session setups with signature "BSRSPYL " */ |
50c2f753 | 201 | if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0) |
b6b38f70 JP |
202 | cFYI(1, "dummy signature received for smb command 0x%x", |
203 | cifs_pdu->Command); | |
1da177e4 LT |
204 | |
205 | /* save off the origiginal signature so we can modify the smb and check | |
206 | its signature against what the server sent */ | |
50c2f753 | 207 | memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8); |
1da177e4 | 208 | |
50c2f753 SF |
209 | cifs_pdu->Signature.Sequence.SequenceNumber = |
210 | cpu_to_le32(expected_sequence_number); | |
1da177e4 LT |
211 | cifs_pdu->Signature.Sequence.Reserved = 0; |
212 | ||
157c2491 | 213 | mutex_lock(&server->srv_mutex); |
21e73393 | 214 | rc = cifs_calculate_signature(cifs_pdu, server, |
1da177e4 | 215 | what_we_think_sig_should_be); |
157c2491 | 216 | mutex_unlock(&server->srv_mutex); |
1da177e4 | 217 | |
50c2f753 | 218 | if (rc) |
1da177e4 LT |
219 | return rc; |
220 | ||
50c2f753 SF |
221 | /* cifs_dump_mem("what we think it should be: ", |
222 | what_we_think_sig_should_be, 16); */ | |
1da177e4 | 223 | |
50c2f753 | 224 | if (memcmp(server_response_sig, what_we_think_sig_should_be, 8)) |
1da177e4 LT |
225 | return -EACCES; |
226 | else | |
227 | return 0; | |
228 | ||
229 | } | |
230 | ||
21e73393 | 231 | /* first calculate 24 bytes ntlm response and then 16 byte session key */ |
96daf2b0 | 232 | int setup_ntlm_response(struct cifs_ses *ses) |
1da177e4 | 233 | { |
ee2c9258 | 234 | int rc = 0; |
21e73393 SP |
235 | unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE; |
236 | char temp_key[CIFS_SESS_KEY_SIZE]; | |
237 | ||
238 | if (!ses) | |
1da177e4 LT |
239 | return -EINVAL; |
240 | ||
21e73393 SP |
241 | ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL); |
242 | if (!ses->auth_key.response) { | |
243 | cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len); | |
244 | return -ENOMEM; | |
245 | } | |
246 | ses->auth_key.len = temp_len; | |
247 | ||
ee2c9258 | 248 | rc = SMBNTencrypt(ses->password, ses->server->cryptkey, |
21e73393 | 249 | ses->auth_key.response + CIFS_SESS_KEY_SIZE); |
ee2c9258 SP |
250 | if (rc) { |
251 | cFYI(1, "%s Can't generate NTLM response, error: %d", | |
252 | __func__, rc); | |
253 | return rc; | |
254 | } | |
255 | ||
256 | rc = E_md4hash(ses->password, temp_key); | |
257 | if (rc) { | |
258 | cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc); | |
259 | return rc; | |
260 | } | |
21e73393 | 261 | |
ee2c9258 SP |
262 | rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE); |
263 | if (rc) | |
264 | cFYI(1, "%s Can't generate NTLM session key, error: %d", | |
265 | __func__, rc); | |
21e73393 | 266 | |
ee2c9258 | 267 | return rc; |
1da177e4 LT |
268 | } |
269 | ||
7c7b25bc | 270 | #ifdef CONFIG_CIFS_WEAK_PW_HASH |
43988d76 | 271 | int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt, |
4e53a3fb | 272 | char *lnm_session_key) |
7c7b25bc SF |
273 | { |
274 | int i; | |
43988d76 | 275 | int rc; |
7c7b25bc SF |
276 | char password_with_pad[CIFS_ENCPWD_SIZE]; |
277 | ||
278 | memset(password_with_pad, 0, CIFS_ENCPWD_SIZE); | |
4e53a3fb JL |
279 | if (password) |
280 | strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE); | |
281 | ||
04912d6a | 282 | if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) { |
4e53a3fb JL |
283 | memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE); |
284 | memcpy(lnm_session_key, password_with_pad, | |
285 | CIFS_ENCPWD_SIZE); | |
43988d76 | 286 | return 0; |
4e53a3fb | 287 | } |
bdc4bf6e | 288 | |
7c7b25bc SF |
289 | /* calculate old style session key */ |
290 | /* calling toupper is less broken than repeatedly | |
291 | calling nls_toupper would be since that will never | |
292 | work for UTF8, but neither handles multibyte code pages | |
293 | but the only alternative would be converting to UCS-16 (Unicode) | |
294 | (using a routine something like UniStrupr) then | |
295 | uppercasing and then converting back from Unicode - which | |
296 | would only worth doing it if we knew it were utf8. Basically | |
297 | utf8 and other multibyte codepages each need their own strupper | |
298 | function since a byte at a time will ont work. */ | |
299 | ||
ef571cad | 300 | for (i = 0; i < CIFS_ENCPWD_SIZE; i++) |
7c7b25bc | 301 | password_with_pad[i] = toupper(password_with_pad[i]); |
7c7b25bc | 302 | |
43988d76 | 303 | rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key); |
4e53a3fb | 304 | |
43988d76 | 305 | return rc; |
7c7b25bc SF |
306 | } |
307 | #endif /* CIFS_WEAK_PW_HASH */ | |
308 | ||
9daa42e2 SP |
309 | /* Build a proper attribute value/target info pairs blob. |
310 | * Fill in netbios and dns domain name and workstation name | |
311 | * and client time (total five av pairs and + one end of fields indicator. | |
312 | * Allocate domain name which gets freed when session struct is deallocated. | |
2b149f11 SP |
313 | */ |
314 | static int | |
96daf2b0 | 315 | build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 | 316 | { |
9daa42e2 SP |
317 | unsigned int dlen; |
318 | unsigned int wlen; | |
319 | unsigned int size = 6 * sizeof(struct ntlmssp2_name); | |
320 | __le64 curtime; | |
321 | char *defdmname = "WORKGROUP"; | |
322 | unsigned char *blobptr; | |
2b149f11 SP |
323 | struct ntlmssp2_name *attrptr; |
324 | ||
9daa42e2 SP |
325 | if (!ses->domainName) { |
326 | ses->domainName = kstrdup(defdmname, GFP_KERNEL); | |
327 | if (!ses->domainName) | |
328 | return -ENOMEM; | |
329 | } | |
330 | ||
331 | dlen = strlen(ses->domainName); | |
332 | wlen = strlen(ses->server->hostname); | |
333 | ||
334 | /* The length of this blob is a size which is | |
335 | * six times the size of a structure which holds name/size + | |
336 | * two times the unicode length of a domain name + | |
337 | * two times the unicode length of a server name + | |
338 | * size of a timestamp (which is 8 bytes). | |
339 | */ | |
d3686d54 SP |
340 | ses->auth_key.len = size + 2 * (2 * dlen) + 2 * (2 * wlen) + 8; |
341 | ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL); | |
342 | if (!ses->auth_key.response) { | |
343 | ses->auth_key.len = 0; | |
2b149f11 SP |
344 | cERROR(1, "Challenge target info allocation failure"); |
345 | return -ENOMEM; | |
346 | } | |
9daa42e2 | 347 | |
d3686d54 | 348 | blobptr = ses->auth_key.response; |
9daa42e2 SP |
349 | attrptr = (struct ntlmssp2_name *) blobptr; |
350 | ||
351 | attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME); | |
352 | attrptr->length = cpu_to_le16(2 * dlen); | |
353 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
354 | cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp); | |
355 | ||
356 | blobptr += 2 * dlen; | |
357 | attrptr = (struct ntlmssp2_name *) blobptr; | |
358 | ||
359 | attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_COMPUTER_NAME); | |
360 | attrptr->length = cpu_to_le16(2 * wlen); | |
361 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
362 | cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp); | |
363 | ||
364 | blobptr += 2 * wlen; | |
365 | attrptr = (struct ntlmssp2_name *) blobptr; | |
366 | ||
367 | attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_DOMAIN_NAME); | |
368 | attrptr->length = cpu_to_le16(2 * dlen); | |
369 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
370 | cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp); | |
371 | ||
372 | blobptr += 2 * dlen; | |
373 | attrptr = (struct ntlmssp2_name *) blobptr; | |
374 | ||
375 | attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_COMPUTER_NAME); | |
376 | attrptr->length = cpu_to_le16(2 * wlen); | |
377 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
378 | cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp); | |
379 | ||
380 | blobptr += 2 * wlen; | |
381 | attrptr = (struct ntlmssp2_name *) blobptr; | |
382 | ||
383 | attrptr->type = cpu_to_le16(NTLMSSP_AV_TIMESTAMP); | |
384 | attrptr->length = cpu_to_le16(sizeof(__le64)); | |
385 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
386 | curtime = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME)); | |
387 | memcpy(blobptr, &curtime, sizeof(__le64)); | |
2b149f11 SP |
388 | |
389 | return 0; | |
390 | } | |
391 | ||
392 | /* Server has provided av pairs/target info in the type 2 challenge | |
393 | * packet and we have plucked it and stored within smb session. | |
394 | * We parse that blob here to find netbios domain name to be used | |
395 | * as part of ntlmv2 authentication (in Target String), if not already | |
396 | * specified on the command line. | |
397 | * If this function returns without any error but without fetching | |
398 | * domain name, authentication may fail against some server but | |
399 | * may not fail against other (those who are not very particular | |
400 | * about target string i.e. for some, just user name might suffice. | |
401 | */ | |
402 | static int | |
96daf2b0 | 403 | find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 SP |
404 | { |
405 | unsigned int attrsize; | |
406 | unsigned int type; | |
407 | unsigned int onesize = sizeof(struct ntlmssp2_name); | |
408 | unsigned char *blobptr; | |
409 | unsigned char *blobend; | |
410 | struct ntlmssp2_name *attrptr; | |
411 | ||
d3686d54 | 412 | if (!ses->auth_key.len || !ses->auth_key.response) |
2b149f11 SP |
413 | return 0; |
414 | ||
d3686d54 SP |
415 | blobptr = ses->auth_key.response; |
416 | blobend = blobptr + ses->auth_key.len; | |
2b149f11 SP |
417 | |
418 | while (blobptr + onesize < blobend) { | |
419 | attrptr = (struct ntlmssp2_name *) blobptr; | |
420 | type = le16_to_cpu(attrptr->type); | |
421 | if (type == NTLMSSP_AV_EOL) | |
422 | break; | |
423 | blobptr += 2; /* advance attr type */ | |
424 | attrsize = le16_to_cpu(attrptr->length); | |
425 | blobptr += 2; /* advance attr size */ | |
426 | if (blobptr + attrsize > blobend) | |
427 | break; | |
428 | if (type == NTLMSSP_AV_NB_DOMAIN_NAME) { | |
429 | if (!attrsize) | |
430 | break; | |
431 | if (!ses->domainName) { | |
432 | ses->domainName = | |
433 | kmalloc(attrsize + 1, GFP_KERNEL); | |
434 | if (!ses->domainName) | |
435 | return -ENOMEM; | |
436 | cifs_from_ucs2(ses->domainName, | |
437 | (__le16 *)blobptr, attrsize, attrsize, | |
f7c5445a | 438 | nls_cp, false); |
2b149f11 SP |
439 | break; |
440 | } | |
441 | } | |
442 | blobptr += attrsize; /* advance attr value */ | |
443 | } | |
444 | ||
445 | return 0; | |
446 | } | |
447 | ||
96daf2b0 | 448 | static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash, |
50c2f753 | 449 | const struct nls_table *nls_cp) |
a8ee0344 SF |
450 | { |
451 | int rc = 0; | |
452 | int len; | |
307fbd31 | 453 | char nt_hash[CIFS_NTHASH_SIZE]; |
50c2f753 SF |
454 | wchar_t *user; |
455 | wchar_t *domain; | |
307fbd31 | 456 | wchar_t *server; |
a8ee0344 | 457 | |
307fbd31 SP |
458 | if (!ses->server->secmech.sdeschmacmd5) { |
459 | cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n"); | |
460 | return -1; | |
461 | } | |
56234e27 | 462 | |
c8e56f1f SF |
463 | /* calculate md4 hash of password */ |
464 | E_md4hash(ses->password, nt_hash); | |
9fbc5908 | 465 | |
307fbd31 SP |
466 | crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash, |
467 | CIFS_NTHASH_SIZE); | |
468 | ||
469 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
470 | if (rc) { | |
471 | cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5\n"); | |
472 | return rc; | |
473 | } | |
a8ee0344 | 474 | |
8727c8a8 SF |
475 | /* convert ses->user_name to unicode and uppercase */ |
476 | len = strlen(ses->user_name); | |
1717ffc5 | 477 | user = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 SP |
478 | if (user == NULL) { |
479 | cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n"); | |
480 | rc = -ENOMEM; | |
1717ffc5 | 481 | goto calc_exit_2; |
307fbd31 | 482 | } |
8727c8a8 | 483 | len = cifs_strtoUCS((__le16 *)user, ses->user_name, len, nls_cp); |
1717ffc5 | 484 | UniStrupr(user); |
307fbd31 SP |
485 | |
486 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, | |
487 | (char *)user, 2 * len); | |
a8ee0344 SF |
488 | |
489 | /* convert ses->domainName to unicode and uppercase */ | |
50c2f753 | 490 | if (ses->domainName) { |
1717ffc5 | 491 | len = strlen(ses->domainName); |
a8ee0344 | 492 | |
50c2f753 | 493 | domain = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 SP |
494 | if (domain == NULL) { |
495 | cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure"); | |
496 | rc = -ENOMEM; | |
1717ffc5 | 497 | goto calc_exit_1; |
307fbd31 | 498 | } |
8f2376ad CG |
499 | len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len, |
500 | nls_cp); | |
307fbd31 SP |
501 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
502 | (char *)domain, 2 * len); | |
1717ffc5 | 503 | kfree(domain); |
307fbd31 SP |
504 | } else if (ses->serverName) { |
505 | len = strlen(ses->serverName); | |
506 | ||
507 | server = kmalloc(2 + (len * 2), GFP_KERNEL); | |
508 | if (server == NULL) { | |
509 | cERROR(1, "calc_ntlmv2_hash: server mem alloc failure"); | |
510 | rc = -ENOMEM; | |
511 | goto calc_exit_1; | |
512 | } | |
513 | len = cifs_strtoUCS((__le16 *)server, ses->serverName, len, | |
514 | nls_cp); | |
515 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, | |
516 | (char *)server, 2 * len); | |
517 | kfree(server); | |
1717ffc5 | 518 | } |
307fbd31 SP |
519 | |
520 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
d3686d54 | 521 | ntlmv2_hash); |
307fbd31 | 522 | |
1717ffc5 SF |
523 | calc_exit_1: |
524 | kfree(user); | |
525 | calc_exit_2: | |
307fbd31 SP |
526 | return rc; |
527 | } | |
528 | ||
529 | static int | |
96daf2b0 | 530 | CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash) |
307fbd31 SP |
531 | { |
532 | int rc; | |
533 | unsigned int offset = CIFS_SESS_KEY_SIZE + 8; | |
534 | ||
535 | if (!ses->server->secmech.sdeschmacmd5) { | |
536 | cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n"); | |
537 | return -1; | |
538 | } | |
539 | ||
540 | crypto_shash_setkey(ses->server->secmech.hmacmd5, | |
d3686d54 | 541 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
307fbd31 SP |
542 | |
543 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
544 | if (rc) { | |
545 | cERROR(1, "CalcNTLMv2_response: could not init hmacmd5"); | |
546 | return rc; | |
547 | } | |
548 | ||
d3ba50b1 SP |
549 | if (ses->server->secType == RawNTLMSSP) |
550 | memcpy(ses->auth_key.response + offset, | |
d3686d54 | 551 | ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); |
d3ba50b1 SP |
552 | else |
553 | memcpy(ses->auth_key.response + offset, | |
554 | ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); | |
307fbd31 SP |
555 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
556 | ses->auth_key.response + offset, ses->auth_key.len - offset); | |
557 | ||
558 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
559 | ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
9fbc5908 SF |
560 | |
561 | return rc; | |
562 | } | |
563 | ||
307fbd31 | 564 | |
2b149f11 | 565 | int |
96daf2b0 | 566 | setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp) |
9fbc5908 | 567 | { |
c8e56f1f | 568 | int rc; |
21e73393 | 569 | int baselen; |
d3686d54 | 570 | unsigned int tilen; |
21e73393 | 571 | struct ntlmv2_resp *buf; |
d3686d54 SP |
572 | char ntlmv2_hash[16]; |
573 | unsigned char *tiblob = NULL; /* target info blob */ | |
6d027cfd | 574 | |
2b149f11 SP |
575 | if (ses->server->secType == RawNTLMSSP) { |
576 | if (!ses->domainName) { | |
f7c5445a | 577 | rc = find_domain_name(ses, nls_cp); |
2b149f11 SP |
578 | if (rc) { |
579 | cERROR(1, "error %d finding domain name", rc); | |
580 | goto setup_ntlmv2_rsp_ret; | |
581 | } | |
582 | } | |
583 | } else { | |
9daa42e2 | 584 | rc = build_avpair_blob(ses, nls_cp); |
2b149f11 SP |
585 | if (rc) { |
586 | cERROR(1, "error %d building av pair blob", rc); | |
d3686d54 | 587 | goto setup_ntlmv2_rsp_ret; |
2b149f11 SP |
588 | } |
589 | } | |
a8ee0344 | 590 | |
21e73393 | 591 | baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp); |
d3686d54 SP |
592 | tilen = ses->auth_key.len; |
593 | tiblob = ses->auth_key.response; | |
594 | ||
595 | ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL); | |
21e73393 SP |
596 | if (!ses->auth_key.response) { |
597 | rc = ENOMEM; | |
d3686d54 | 598 | ses->auth_key.len = 0; |
21e73393 SP |
599 | cERROR(1, "%s: Can't allocate auth blob", __func__); |
600 | goto setup_ntlmv2_rsp_ret; | |
601 | } | |
d3686d54 | 602 | ses->auth_key.len += baselen; |
21e73393 SP |
603 | |
604 | buf = (struct ntlmv2_resp *) | |
605 | (ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
606 | buf->blob_signature = cpu_to_le32(0x00000101); | |
607 | buf->reserved = 0; | |
608 | buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME)); | |
609 | get_random_bytes(&buf->client_chal, sizeof(buf->client_chal)); | |
610 | buf->reserved2 = 0; | |
611 | ||
d3686d54 | 612 | memcpy(ses->auth_key.response + baselen, tiblob, tilen); |
21e73393 | 613 | |
f7c5445a | 614 | /* calculate ntlmv2_hash */ |
d3686d54 | 615 | rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp); |
2b149f11 | 616 | if (rc) { |
b6b38f70 | 617 | cERROR(1, "could not get v2 hash rc %d", rc); |
2b149f11 SP |
618 | goto setup_ntlmv2_rsp_ret; |
619 | } | |
f7c5445a SP |
620 | |
621 | /* calculate first part of the client response (CR1) */ | |
d3686d54 | 622 | rc = CalcNTLMv2_response(ses, ntlmv2_hash); |
307fbd31 SP |
623 | if (rc) { |
624 | cERROR(1, "Could not calculate CR1 rc: %d", rc); | |
625 | goto setup_ntlmv2_rsp_ret; | |
626 | } | |
b609f06a | 627 | |
5d0d2882 | 628 | /* now calculate the session key for NTLMv2 */ |
307fbd31 | 629 | crypto_shash_setkey(ses->server->secmech.hmacmd5, |
d3686d54 | 630 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
307fbd31 SP |
631 | |
632 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
633 | if (rc) { | |
634 | cERROR(1, "%s: Could not init hmacmd5\n", __func__); | |
635 | goto setup_ntlmv2_rsp_ret; | |
636 | } | |
637 | ||
638 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, | |
639 | ses->auth_key.response + CIFS_SESS_KEY_SIZE, | |
640 | CIFS_HMAC_MD5_HASH_SIZE); | |
641 | ||
642 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
643 | ses->auth_key.response); | |
2b149f11 | 644 | |
2b149f11 | 645 | setup_ntlmv2_rsp_ret: |
d3686d54 | 646 | kfree(tiblob); |
2b149f11 SP |
647 | |
648 | return rc; | |
6d027cfd SF |
649 | } |
650 | ||
d2b91521 | 651 | int |
96daf2b0 | 652 | calc_seckey(struct cifs_ses *ses) |
d2b91521 SP |
653 | { |
654 | int rc; | |
655 | struct crypto_blkcipher *tfm_arc4; | |
656 | struct scatterlist sgin, sgout; | |
657 | struct blkcipher_desc desc; | |
658 | unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */ | |
659 | ||
660 | get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE); | |
661 | ||
662 | tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC); | |
7a8587e7 SP |
663 | if (IS_ERR(tfm_arc4)) { |
664 | rc = PTR_ERR(tfm_arc4); | |
d2b91521 | 665 | cERROR(1, "could not allocate crypto API arc4\n"); |
7a8587e7 | 666 | return rc; |
d2b91521 SP |
667 | } |
668 | ||
669 | desc.tfm = tfm_arc4; | |
670 | ||
671 | crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response, | |
672 | CIFS_SESS_KEY_SIZE); | |
673 | ||
674 | sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE); | |
d3686d54 | 675 | sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); |
d2b91521 SP |
676 | |
677 | rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE); | |
678 | if (rc) { | |
679 | cERROR(1, "could not encrypt session key rc: %d\n", rc); | |
680 | crypto_free_blkcipher(tfm_arc4); | |
681 | return rc; | |
682 | } | |
683 | ||
684 | /* make secondary_key/nonce as session key */ | |
685 | memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE); | |
686 | /* and make len as that of session key only */ | |
687 | ses->auth_key.len = CIFS_SESS_KEY_SIZE; | |
688 | ||
689 | crypto_free_blkcipher(tfm_arc4); | |
690 | ||
691 | return 0; | |
692 | } | |
693 | ||
694 | void | |
695 | cifs_crypto_shash_release(struct TCP_Server_Info *server) | |
696 | { | |
697 | if (server->secmech.md5) | |
698 | crypto_free_shash(server->secmech.md5); | |
699 | ||
700 | if (server->secmech.hmacmd5) | |
701 | crypto_free_shash(server->secmech.hmacmd5); | |
702 | ||
703 | kfree(server->secmech.sdeschmacmd5); | |
704 | ||
705 | kfree(server->secmech.sdescmd5); | |
706 | } | |
707 | ||
708 | int | |
709 | cifs_crypto_shash_allocate(struct TCP_Server_Info *server) | |
710 | { | |
711 | int rc; | |
712 | unsigned int size; | |
713 | ||
714 | server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0); | |
ee2c9258 | 715 | if (IS_ERR(server->secmech.hmacmd5)) { |
d2b91521 SP |
716 | cERROR(1, "could not allocate crypto hmacmd5\n"); |
717 | return PTR_ERR(server->secmech.hmacmd5); | |
718 | } | |
719 | ||
720 | server->secmech.md5 = crypto_alloc_shash("md5", 0, 0); | |
ee2c9258 | 721 | if (IS_ERR(server->secmech.md5)) { |
d2b91521 SP |
722 | cERROR(1, "could not allocate crypto md5\n"); |
723 | rc = PTR_ERR(server->secmech.md5); | |
724 | goto crypto_allocate_md5_fail; | |
725 | } | |
726 | ||
727 | size = sizeof(struct shash_desc) + | |
728 | crypto_shash_descsize(server->secmech.hmacmd5); | |
729 | server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL); | |
730 | if (!server->secmech.sdeschmacmd5) { | |
731 | cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5\n"); | |
732 | rc = -ENOMEM; | |
733 | goto crypto_allocate_hmacmd5_sdesc_fail; | |
734 | } | |
735 | server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5; | |
736 | server->secmech.sdeschmacmd5->shash.flags = 0x0; | |
737 | ||
738 | ||
739 | size = sizeof(struct shash_desc) + | |
740 | crypto_shash_descsize(server->secmech.md5); | |
741 | server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL); | |
742 | if (!server->secmech.sdescmd5) { | |
743 | cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5\n"); | |
744 | rc = -ENOMEM; | |
745 | goto crypto_allocate_md5_sdesc_fail; | |
746 | } | |
747 | server->secmech.sdescmd5->shash.tfm = server->secmech.md5; | |
748 | server->secmech.sdescmd5->shash.flags = 0x0; | |
749 | ||
750 | return 0; | |
751 | ||
752 | crypto_allocate_md5_sdesc_fail: | |
753 | kfree(server->secmech.sdeschmacmd5); | |
754 | ||
755 | crypto_allocate_hmacmd5_sdesc_fail: | |
756 | crypto_free_shash(server->secmech.md5); | |
757 | ||
758 | crypto_allocate_md5_fail: | |
759 | crypto_free_shash(server->secmech.hmacmd5); | |
760 | ||
761 | return rc; | |
762 | } |