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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 | */ | |
826a95e4 JL |
40 | static int cifs_calc_signature(const struct kvec *iov, int n_vec, |
41 | struct TCP_Server_Info *server, char *signature) | |
84afc29b | 42 | { |
e9917a00 | 43 | int i; |
307fbd31 | 44 | int rc; |
84afc29b | 45 | |
21e73393 | 46 | if (iov == NULL || signature == NULL || server == NULL) |
e9917a00 | 47 | return -EINVAL; |
84afc29b | 48 | |
307fbd31 | 49 | if (!server->secmech.sdescmd5) { |
ac3aa2f8 | 50 | cERROR(1, "%s: Can't generate signature", __func__); |
307fbd31 SP |
51 | return -1; |
52 | } | |
53 | ||
54 | rc = crypto_shash_init(&server->secmech.sdescmd5->shash); | |
55 | if (rc) { | |
ac3aa2f8 | 56 | cERROR(1, "%s: Could not init md5", __func__); |
307fbd31 SP |
57 | return rc; |
58 | } | |
59 | ||
14cae324 | 60 | rc = crypto_shash_update(&server->secmech.sdescmd5->shash, |
307fbd31 | 61 | server->session_key.response, server->session_key.len); |
14cae324 | 62 | if (rc) { |
ac3aa2f8 | 63 | cERROR(1, "%s: Could not update with response", __func__); |
14cae324 SP |
64 | return rc; |
65 | } | |
307fbd31 | 66 | |
50c2f753 | 67 | for (i = 0; i < n_vec; i++) { |
745542e2 JL |
68 | if (iov[i].iov_len == 0) |
69 | continue; | |
ffdd6e4d | 70 | if (iov[i].iov_base == NULL) { |
56234e27 | 71 | cERROR(1, "null iovec entry"); |
e9917a00 | 72 | return -EIO; |
745542e2 | 73 | } |
ffdd6e4d | 74 | /* The first entry includes a length field (which does not get |
e9917a00 | 75 | signed that occupies the first 4 bytes before the header */ |
ffdd6e4d | 76 | if (i == 0) { |
63d2583f | 77 | if (iov[0].iov_len <= 8) /* cmd field at offset 9 */ |
e9917a00 | 78 | break; /* nothing to sign or corrupt header */ |
14cae324 | 79 | rc = |
307fbd31 SP |
80 | crypto_shash_update(&server->secmech.sdescmd5->shash, |
81 | iov[i].iov_base + 4, iov[i].iov_len - 4); | |
14cae324 SP |
82 | } else { |
83 | rc = | |
307fbd31 SP |
84 | crypto_shash_update(&server->secmech.sdescmd5->shash, |
85 | iov[i].iov_base, iov[i].iov_len); | |
14cae324 SP |
86 | } |
87 | if (rc) { | |
ac3aa2f8 | 88 | cERROR(1, "%s: Could not update with payload", |
14cae324 SP |
89 | __func__); |
90 | return rc; | |
91 | } | |
e9917a00 | 92 | } |
84afc29b | 93 | |
307fbd31 | 94 | rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature); |
14cae324 | 95 | if (rc) |
ac3aa2f8 | 96 | cERROR(1, "%s: Could not generate md5 hash", __func__); |
84afc29b | 97 | |
307fbd31 | 98 | return rc; |
84afc29b SF |
99 | } |
100 | ||
a0f8b4fb | 101 | /* must be called with server->srv_mutex held */ |
762a4206 | 102 | int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server, |
63d2583f | 103 | __u32 *pexpected_response_sequence_number) |
84afc29b SF |
104 | { |
105 | int rc = 0; | |
106 | char smb_signature[20]; | |
826a95e4 | 107 | struct smb_hdr *cifs_pdu = (struct smb_hdr *)iov[0].iov_base; |
84afc29b | 108 | |
ffdd6e4d | 109 | if ((cifs_pdu == NULL) || (server == NULL)) |
84afc29b SF |
110 | return -EINVAL; |
111 | ||
998d6fcb JL |
112 | if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) || |
113 | server->tcpStatus == CifsNeedNegotiate) | |
84afc29b SF |
114 | return rc; |
115 | ||
998d6fcb | 116 | if (!server->session_estab) { |
b4dacbc2 | 117 | memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8); |
998d6fcb JL |
118 | return rc; |
119 | } | |
120 | ||
ffdd6e4d | 121 | cifs_pdu->Signature.Sequence.SequenceNumber = |
84afc29b | 122 | cpu_to_le32(server->sequence_number); |
ffdd6e4d | 123 | cifs_pdu->Signature.Sequence.Reserved = 0; |
84afc29b | 124 | |
ffdd6e4d SF |
125 | *pexpected_response_sequence_number = server->sequence_number++; |
126 | server->sequence_number++; | |
84afc29b | 127 | |
826a95e4 | 128 | rc = cifs_calc_signature(iov, n_vec, server, smb_signature); |
ffdd6e4d SF |
129 | if (rc) |
130 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |
131 | else | |
132 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
84afc29b | 133 | |
ffdd6e4d | 134 | return rc; |
84afc29b SF |
135 | } |
136 | ||
826a95e4 JL |
137 | /* must be called with server->srv_mutex held */ |
138 | int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server, | |
139 | __u32 *pexpected_response_sequence_number) | |
140 | { | |
141 | struct kvec iov; | |
142 | ||
143 | iov.iov_base = cifs_pdu; | |
144 | iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4; | |
145 | ||
762a4206 | 146 | return cifs_sign_smbv(&iov, 1, server, |
826a95e4 JL |
147 | pexpected_response_sequence_number); |
148 | } | |
149 | ||
150 | int cifs_verify_signature(struct kvec *iov, unsigned int nr_iov, | |
21e73393 | 151 | struct TCP_Server_Info *server, |
ffdd6e4d | 152 | __u32 expected_sequence_number) |
1da177e4 | 153 | { |
c8e56f1f | 154 | unsigned int rc; |
1da177e4 LT |
155 | char server_response_sig[8]; |
156 | char what_we_think_sig_should_be[20]; | |
826a95e4 | 157 | struct smb_hdr *cifs_pdu = (struct smb_hdr *)iov[0].iov_base; |
1da177e4 | 158 | |
21e73393 | 159 | if (cifs_pdu == NULL || server == NULL) |
1da177e4 LT |
160 | return -EINVAL; |
161 | ||
9c4843ea | 162 | if (!server->session_estab) |
1da177e4 LT |
163 | return 0; |
164 | ||
165 | if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) { | |
50c2f753 | 166 | struct smb_com_lock_req *pSMB = |
ffdd6e4d SF |
167 | (struct smb_com_lock_req *)cifs_pdu; |
168 | if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) | |
1da177e4 LT |
169 | return 0; |
170 | } | |
171 | ||
50c2f753 SF |
172 | /* BB what if signatures are supposed to be on for session but |
173 | server does not send one? BB */ | |
174 | ||
1da177e4 | 175 | /* Do not need to verify session setups with signature "BSRSPYL " */ |
50c2f753 | 176 | if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0) |
b6b38f70 JP |
177 | cFYI(1, "dummy signature received for smb command 0x%x", |
178 | cifs_pdu->Command); | |
1da177e4 LT |
179 | |
180 | /* save off the origiginal signature so we can modify the smb and check | |
181 | its signature against what the server sent */ | |
50c2f753 | 182 | memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8); |
1da177e4 | 183 | |
50c2f753 SF |
184 | cifs_pdu->Signature.Sequence.SequenceNumber = |
185 | cpu_to_le32(expected_sequence_number); | |
1da177e4 LT |
186 | cifs_pdu->Signature.Sequence.Reserved = 0; |
187 | ||
157c2491 | 188 | mutex_lock(&server->srv_mutex); |
826a95e4 JL |
189 | rc = cifs_calc_signature(iov, nr_iov, server, |
190 | what_we_think_sig_should_be); | |
157c2491 | 191 | mutex_unlock(&server->srv_mutex); |
1da177e4 | 192 | |
50c2f753 | 193 | if (rc) |
1da177e4 LT |
194 | return rc; |
195 | ||
50c2f753 SF |
196 | /* cifs_dump_mem("what we think it should be: ", |
197 | what_we_think_sig_should_be, 16); */ | |
1da177e4 | 198 | |
50c2f753 | 199 | if (memcmp(server_response_sig, what_we_think_sig_should_be, 8)) |
1da177e4 LT |
200 | return -EACCES; |
201 | else | |
202 | return 0; | |
203 | ||
204 | } | |
205 | ||
21e73393 | 206 | /* first calculate 24 bytes ntlm response and then 16 byte session key */ |
9ef5992e | 207 | int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp) |
1da177e4 | 208 | { |
ee2c9258 | 209 | int rc = 0; |
21e73393 SP |
210 | unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE; |
211 | char temp_key[CIFS_SESS_KEY_SIZE]; | |
212 | ||
213 | if (!ses) | |
1da177e4 LT |
214 | return -EINVAL; |
215 | ||
21e73393 SP |
216 | ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL); |
217 | if (!ses->auth_key.response) { | |
218 | cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len); | |
219 | return -ENOMEM; | |
220 | } | |
221 | ses->auth_key.len = temp_len; | |
222 | ||
ee2c9258 | 223 | rc = SMBNTencrypt(ses->password, ses->server->cryptkey, |
9ef5992e | 224 | ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp); |
ee2c9258 SP |
225 | if (rc) { |
226 | cFYI(1, "%s Can't generate NTLM response, error: %d", | |
227 | __func__, rc); | |
228 | return rc; | |
229 | } | |
230 | ||
9ef5992e | 231 | rc = E_md4hash(ses->password, temp_key, nls_cp); |
ee2c9258 SP |
232 | if (rc) { |
233 | cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc); | |
234 | return rc; | |
235 | } | |
21e73393 | 236 | |
ee2c9258 SP |
237 | rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE); |
238 | if (rc) | |
239 | cFYI(1, "%s Can't generate NTLM session key, error: %d", | |
240 | __func__, rc); | |
21e73393 | 241 | |
ee2c9258 | 242 | return rc; |
1da177e4 LT |
243 | } |
244 | ||
7c7b25bc | 245 | #ifdef CONFIG_CIFS_WEAK_PW_HASH |
43988d76 | 246 | int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt, |
4e53a3fb | 247 | char *lnm_session_key) |
7c7b25bc SF |
248 | { |
249 | int i; | |
43988d76 | 250 | int rc; |
7c7b25bc SF |
251 | char password_with_pad[CIFS_ENCPWD_SIZE]; |
252 | ||
253 | memset(password_with_pad, 0, CIFS_ENCPWD_SIZE); | |
4e53a3fb JL |
254 | if (password) |
255 | strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE); | |
256 | ||
04912d6a | 257 | if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) { |
4e53a3fb JL |
258 | memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE); |
259 | memcpy(lnm_session_key, password_with_pad, | |
260 | CIFS_ENCPWD_SIZE); | |
43988d76 | 261 | return 0; |
4e53a3fb | 262 | } |
bdc4bf6e | 263 | |
7c7b25bc SF |
264 | /* calculate old style session key */ |
265 | /* calling toupper is less broken than repeatedly | |
266 | calling nls_toupper would be since that will never | |
267 | work for UTF8, but neither handles multibyte code pages | |
268 | but the only alternative would be converting to UCS-16 (Unicode) | |
269 | (using a routine something like UniStrupr) then | |
270 | uppercasing and then converting back from Unicode - which | |
271 | would only worth doing it if we knew it were utf8. Basically | |
272 | utf8 and other multibyte codepages each need their own strupper | |
273 | function since a byte at a time will ont work. */ | |
274 | ||
ef571cad | 275 | for (i = 0; i < CIFS_ENCPWD_SIZE; i++) |
7c7b25bc | 276 | password_with_pad[i] = toupper(password_with_pad[i]); |
7c7b25bc | 277 | |
43988d76 | 278 | rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key); |
4e53a3fb | 279 | |
43988d76 | 280 | return rc; |
7c7b25bc SF |
281 | } |
282 | #endif /* CIFS_WEAK_PW_HASH */ | |
283 | ||
9daa42e2 SP |
284 | /* Build a proper attribute value/target info pairs blob. |
285 | * Fill in netbios and dns domain name and workstation name | |
286 | * and client time (total five av pairs and + one end of fields indicator. | |
287 | * Allocate domain name which gets freed when session struct is deallocated. | |
2b149f11 SP |
288 | */ |
289 | static int | |
96daf2b0 | 290 | build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 | 291 | { |
9daa42e2 | 292 | unsigned int dlen; |
cfbd6f84 | 293 | unsigned int size = 2 * sizeof(struct ntlmssp2_name); |
9daa42e2 SP |
294 | char *defdmname = "WORKGROUP"; |
295 | unsigned char *blobptr; | |
2b149f11 SP |
296 | struct ntlmssp2_name *attrptr; |
297 | ||
9daa42e2 SP |
298 | if (!ses->domainName) { |
299 | ses->domainName = kstrdup(defdmname, GFP_KERNEL); | |
300 | if (!ses->domainName) | |
301 | return -ENOMEM; | |
302 | } | |
303 | ||
304 | dlen = strlen(ses->domainName); | |
9daa42e2 | 305 | |
cfbd6f84 SP |
306 | /* |
307 | * The length of this blob is two times the size of a | |
308 | * structure (av pair) which holds name/size | |
309 | * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) + | |
310 | * unicode length of a netbios domain name | |
9daa42e2 | 311 | */ |
cfbd6f84 | 312 | ses->auth_key.len = size + 2 * dlen; |
d3686d54 SP |
313 | ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL); |
314 | if (!ses->auth_key.response) { | |
315 | ses->auth_key.len = 0; | |
2b149f11 SP |
316 | cERROR(1, "Challenge target info allocation failure"); |
317 | return -ENOMEM; | |
318 | } | |
9daa42e2 | 319 | |
d3686d54 | 320 | blobptr = ses->auth_key.response; |
9daa42e2 SP |
321 | attrptr = (struct ntlmssp2_name *) blobptr; |
322 | ||
cfbd6f84 SP |
323 | /* |
324 | * As defined in MS-NTLM 3.3.2, just this av pair field | |
325 | * is sufficient as part of the temp | |
326 | */ | |
9daa42e2 SP |
327 | attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME); |
328 | attrptr->length = cpu_to_le16(2 * dlen); | |
329 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
acbbb76a | 330 | cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp); |
9daa42e2 | 331 | |
2b149f11 SP |
332 | return 0; |
333 | } | |
334 | ||
335 | /* Server has provided av pairs/target info in the type 2 challenge | |
336 | * packet and we have plucked it and stored within smb session. | |
337 | * We parse that blob here to find netbios domain name to be used | |
338 | * as part of ntlmv2 authentication (in Target String), if not already | |
339 | * specified on the command line. | |
340 | * If this function returns without any error but without fetching | |
341 | * domain name, authentication may fail against some server but | |
342 | * may not fail against other (those who are not very particular | |
343 | * about target string i.e. for some, just user name might suffice. | |
344 | */ | |
345 | static int | |
96daf2b0 | 346 | find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 SP |
347 | { |
348 | unsigned int attrsize; | |
349 | unsigned int type; | |
350 | unsigned int onesize = sizeof(struct ntlmssp2_name); | |
351 | unsigned char *blobptr; | |
352 | unsigned char *blobend; | |
353 | struct ntlmssp2_name *attrptr; | |
354 | ||
d3686d54 | 355 | if (!ses->auth_key.len || !ses->auth_key.response) |
2b149f11 SP |
356 | return 0; |
357 | ||
d3686d54 SP |
358 | blobptr = ses->auth_key.response; |
359 | blobend = blobptr + ses->auth_key.len; | |
2b149f11 SP |
360 | |
361 | while (blobptr + onesize < blobend) { | |
362 | attrptr = (struct ntlmssp2_name *) blobptr; | |
363 | type = le16_to_cpu(attrptr->type); | |
364 | if (type == NTLMSSP_AV_EOL) | |
365 | break; | |
366 | blobptr += 2; /* advance attr type */ | |
367 | attrsize = le16_to_cpu(attrptr->length); | |
368 | blobptr += 2; /* advance attr size */ | |
369 | if (blobptr + attrsize > blobend) | |
370 | break; | |
371 | if (type == NTLMSSP_AV_NB_DOMAIN_NAME) { | |
372 | if (!attrsize) | |
373 | break; | |
374 | if (!ses->domainName) { | |
375 | ses->domainName = | |
376 | kmalloc(attrsize + 1, GFP_KERNEL); | |
377 | if (!ses->domainName) | |
378 | return -ENOMEM; | |
acbbb76a | 379 | cifs_from_utf16(ses->domainName, |
2b149f11 | 380 | (__le16 *)blobptr, attrsize, attrsize, |
f7c5445a | 381 | nls_cp, false); |
2b149f11 SP |
382 | break; |
383 | } | |
384 | } | |
385 | blobptr += attrsize; /* advance attr value */ | |
386 | } | |
387 | ||
388 | return 0; | |
389 | } | |
390 | ||
96daf2b0 | 391 | static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash, |
50c2f753 | 392 | const struct nls_table *nls_cp) |
a8ee0344 SF |
393 | { |
394 | int rc = 0; | |
395 | int len; | |
307fbd31 | 396 | char nt_hash[CIFS_NTHASH_SIZE]; |
50c2f753 SF |
397 | wchar_t *user; |
398 | wchar_t *domain; | |
307fbd31 | 399 | wchar_t *server; |
a8ee0344 | 400 | |
307fbd31 | 401 | if (!ses->server->secmech.sdeschmacmd5) { |
ac3aa2f8 | 402 | cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash"); |
307fbd31 SP |
403 | return -1; |
404 | } | |
56234e27 | 405 | |
c8e56f1f | 406 | /* calculate md4 hash of password */ |
9ef5992e | 407 | E_md4hash(ses->password, nt_hash, nls_cp); |
9fbc5908 | 408 | |
14cae324 | 409 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash, |
307fbd31 | 410 | CIFS_NTHASH_SIZE); |
14cae324 SP |
411 | if (rc) { |
412 | cERROR(1, "%s: Could not set NT Hash as a key", __func__); | |
413 | return rc; | |
414 | } | |
307fbd31 SP |
415 | |
416 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
417 | if (rc) { | |
ac3aa2f8 | 418 | cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5"); |
307fbd31 SP |
419 | return rc; |
420 | } | |
a8ee0344 | 421 | |
8727c8a8 | 422 | /* convert ses->user_name to unicode and uppercase */ |
04febabc | 423 | len = ses->user_name ? strlen(ses->user_name) : 0; |
1717ffc5 | 424 | user = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 425 | if (user == NULL) { |
ac3aa2f8 | 426 | cERROR(1, "calc_ntlmv2_hash: user mem alloc failure"); |
307fbd31 | 427 | rc = -ENOMEM; |
14cae324 | 428 | return rc; |
307fbd31 | 429 | } |
04febabc JL |
430 | |
431 | if (len) { | |
acbbb76a | 432 | len = cifs_strtoUTF16((__le16 *)user, ses->user_name, len, nls_cp); |
04febabc JL |
433 | UniStrupr(user); |
434 | } else { | |
435 | memset(user, '\0', 2); | |
436 | } | |
307fbd31 | 437 | |
14cae324 | 438 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 | 439 | (char *)user, 2 * len); |
14cae324 SP |
440 | kfree(user); |
441 | if (rc) { | |
ac3aa2f8 | 442 | cERROR(1, "%s: Could not update with user", __func__); |
14cae324 SP |
443 | return rc; |
444 | } | |
a8ee0344 SF |
445 | |
446 | /* convert ses->domainName to unicode and uppercase */ | |
50c2f753 | 447 | if (ses->domainName) { |
1717ffc5 | 448 | len = strlen(ses->domainName); |
a8ee0344 | 449 | |
50c2f753 | 450 | domain = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 SP |
451 | if (domain == NULL) { |
452 | cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure"); | |
453 | rc = -ENOMEM; | |
14cae324 | 454 | return rc; |
307fbd31 | 455 | } |
acbbb76a SF |
456 | len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len, |
457 | nls_cp); | |
14cae324 | 458 | rc = |
307fbd31 SP |
459 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
460 | (char *)domain, 2 * len); | |
1717ffc5 | 461 | kfree(domain); |
14cae324 | 462 | if (rc) { |
ac3aa2f8 | 463 | cERROR(1, "%s: Could not update with domain", |
14cae324 SP |
464 | __func__); |
465 | return rc; | |
466 | } | |
307fbd31 SP |
467 | } else if (ses->serverName) { |
468 | len = strlen(ses->serverName); | |
469 | ||
470 | server = kmalloc(2 + (len * 2), GFP_KERNEL); | |
471 | if (server == NULL) { | |
472 | cERROR(1, "calc_ntlmv2_hash: server mem alloc failure"); | |
473 | rc = -ENOMEM; | |
14cae324 | 474 | return rc; |
307fbd31 | 475 | } |
acbbb76a | 476 | len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len, |
307fbd31 | 477 | nls_cp); |
14cae324 | 478 | rc = |
307fbd31 SP |
479 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
480 | (char *)server, 2 * len); | |
481 | kfree(server); | |
14cae324 | 482 | if (rc) { |
ac3aa2f8 | 483 | cERROR(1, "%s: Could not update with server", |
14cae324 SP |
484 | __func__); |
485 | return rc; | |
486 | } | |
1717ffc5 | 487 | } |
307fbd31 SP |
488 | |
489 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
d3686d54 | 490 | ntlmv2_hash); |
14cae324 | 491 | if (rc) |
ac3aa2f8 | 492 | cERROR(1, "%s: Could not generate md5 hash", __func__); |
307fbd31 | 493 | |
307fbd31 SP |
494 | return rc; |
495 | } | |
496 | ||
497 | static int | |
96daf2b0 | 498 | CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash) |
307fbd31 SP |
499 | { |
500 | int rc; | |
501 | unsigned int offset = CIFS_SESS_KEY_SIZE + 8; | |
502 | ||
503 | if (!ses->server->secmech.sdeschmacmd5) { | |
ac3aa2f8 | 504 | cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash"); |
307fbd31 SP |
505 | return -1; |
506 | } | |
507 | ||
14cae324 | 508 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
d3686d54 | 509 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 SP |
510 | if (rc) { |
511 | cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__); | |
512 | return rc; | |
513 | } | |
307fbd31 SP |
514 | |
515 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
516 | if (rc) { | |
517 | cERROR(1, "CalcNTLMv2_response: could not init hmacmd5"); | |
518 | return rc; | |
519 | } | |
520 | ||
d3ba50b1 SP |
521 | if (ses->server->secType == RawNTLMSSP) |
522 | memcpy(ses->auth_key.response + offset, | |
d3686d54 | 523 | ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); |
d3ba50b1 SP |
524 | else |
525 | memcpy(ses->auth_key.response + offset, | |
526 | ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); | |
14cae324 | 527 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 | 528 | ses->auth_key.response + offset, ses->auth_key.len - offset); |
14cae324 | 529 | if (rc) { |
ac3aa2f8 | 530 | cERROR(1, "%s: Could not update with response", __func__); |
14cae324 SP |
531 | return rc; |
532 | } | |
307fbd31 SP |
533 | |
534 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
535 | ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
14cae324 | 536 | if (rc) |
ac3aa2f8 | 537 | cERROR(1, "%s: Could not generate md5 hash", __func__); |
9fbc5908 SF |
538 | |
539 | return rc; | |
540 | } | |
541 | ||
307fbd31 | 542 | |
2b149f11 | 543 | int |
96daf2b0 | 544 | setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp) |
9fbc5908 | 545 | { |
c8e56f1f | 546 | int rc; |
21e73393 | 547 | int baselen; |
d3686d54 | 548 | unsigned int tilen; |
21e73393 | 549 | struct ntlmv2_resp *buf; |
d3686d54 SP |
550 | char ntlmv2_hash[16]; |
551 | unsigned char *tiblob = NULL; /* target info blob */ | |
6d027cfd | 552 | |
2b149f11 SP |
553 | if (ses->server->secType == RawNTLMSSP) { |
554 | if (!ses->domainName) { | |
f7c5445a | 555 | rc = find_domain_name(ses, nls_cp); |
2b149f11 SP |
556 | if (rc) { |
557 | cERROR(1, "error %d finding domain name", rc); | |
558 | goto setup_ntlmv2_rsp_ret; | |
559 | } | |
560 | } | |
561 | } else { | |
9daa42e2 | 562 | rc = build_avpair_blob(ses, nls_cp); |
2b149f11 SP |
563 | if (rc) { |
564 | cERROR(1, "error %d building av pair blob", rc); | |
d3686d54 | 565 | goto setup_ntlmv2_rsp_ret; |
2b149f11 SP |
566 | } |
567 | } | |
a8ee0344 | 568 | |
21e73393 | 569 | baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp); |
d3686d54 SP |
570 | tilen = ses->auth_key.len; |
571 | tiblob = ses->auth_key.response; | |
572 | ||
573 | ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL); | |
21e73393 SP |
574 | if (!ses->auth_key.response) { |
575 | rc = ENOMEM; | |
d3686d54 | 576 | ses->auth_key.len = 0; |
21e73393 SP |
577 | cERROR(1, "%s: Can't allocate auth blob", __func__); |
578 | goto setup_ntlmv2_rsp_ret; | |
579 | } | |
d3686d54 | 580 | ses->auth_key.len += baselen; |
21e73393 SP |
581 | |
582 | buf = (struct ntlmv2_resp *) | |
583 | (ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
584 | buf->blob_signature = cpu_to_le32(0x00000101); | |
585 | buf->reserved = 0; | |
586 | buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME)); | |
587 | get_random_bytes(&buf->client_chal, sizeof(buf->client_chal)); | |
588 | buf->reserved2 = 0; | |
589 | ||
d3686d54 | 590 | memcpy(ses->auth_key.response + baselen, tiblob, tilen); |
21e73393 | 591 | |
f7c5445a | 592 | /* calculate ntlmv2_hash */ |
d3686d54 | 593 | rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp); |
2b149f11 | 594 | if (rc) { |
b6b38f70 | 595 | cERROR(1, "could not get v2 hash rc %d", rc); |
2b149f11 SP |
596 | goto setup_ntlmv2_rsp_ret; |
597 | } | |
f7c5445a SP |
598 | |
599 | /* calculate first part of the client response (CR1) */ | |
d3686d54 | 600 | rc = CalcNTLMv2_response(ses, ntlmv2_hash); |
307fbd31 SP |
601 | if (rc) { |
602 | cERROR(1, "Could not calculate CR1 rc: %d", rc); | |
603 | goto setup_ntlmv2_rsp_ret; | |
604 | } | |
b609f06a | 605 | |
5d0d2882 | 606 | /* now calculate the session key for NTLMv2 */ |
14cae324 | 607 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
d3686d54 | 608 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 SP |
609 | if (rc) { |
610 | cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__); | |
611 | goto setup_ntlmv2_rsp_ret; | |
612 | } | |
307fbd31 SP |
613 | |
614 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
615 | if (rc) { | |
ac3aa2f8 | 616 | cERROR(1, "%s: Could not init hmacmd5", __func__); |
307fbd31 SP |
617 | goto setup_ntlmv2_rsp_ret; |
618 | } | |
619 | ||
14cae324 | 620 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 SP |
621 | ses->auth_key.response + CIFS_SESS_KEY_SIZE, |
622 | CIFS_HMAC_MD5_HASH_SIZE); | |
14cae324 | 623 | if (rc) { |
ac3aa2f8 | 624 | cERROR(1, "%s: Could not update with response", __func__); |
14cae324 SP |
625 | goto setup_ntlmv2_rsp_ret; |
626 | } | |
307fbd31 SP |
627 | |
628 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
629 | ses->auth_key.response); | |
14cae324 | 630 | if (rc) |
ac3aa2f8 | 631 | cERROR(1, "%s: Could not generate md5 hash", __func__); |
2b149f11 | 632 | |
2b149f11 | 633 | setup_ntlmv2_rsp_ret: |
d3686d54 | 634 | kfree(tiblob); |
2b149f11 SP |
635 | |
636 | return rc; | |
6d027cfd SF |
637 | } |
638 | ||
d2b91521 | 639 | int |
96daf2b0 | 640 | calc_seckey(struct cifs_ses *ses) |
d2b91521 SP |
641 | { |
642 | int rc; | |
643 | struct crypto_blkcipher *tfm_arc4; | |
644 | struct scatterlist sgin, sgout; | |
645 | struct blkcipher_desc desc; | |
646 | unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */ | |
647 | ||
648 | get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE); | |
649 | ||
650 | tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC); | |
7a8587e7 SP |
651 | if (IS_ERR(tfm_arc4)) { |
652 | rc = PTR_ERR(tfm_arc4); | |
ac3aa2f8 | 653 | cERROR(1, "could not allocate crypto API arc4"); |
7a8587e7 | 654 | return rc; |
d2b91521 SP |
655 | } |
656 | ||
657 | desc.tfm = tfm_arc4; | |
658 | ||
14cae324 | 659 | rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response, |
d2b91521 | 660 | CIFS_SESS_KEY_SIZE); |
14cae324 SP |
661 | if (rc) { |
662 | cERROR(1, "%s: Could not set response as a key", __func__); | |
663 | return rc; | |
664 | } | |
d2b91521 SP |
665 | |
666 | sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE); | |
d3686d54 | 667 | sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); |
d2b91521 SP |
668 | |
669 | rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE); | |
670 | if (rc) { | |
ac3aa2f8 | 671 | cERROR(1, "could not encrypt session key rc: %d", rc); |
d2b91521 SP |
672 | crypto_free_blkcipher(tfm_arc4); |
673 | return rc; | |
674 | } | |
675 | ||
676 | /* make secondary_key/nonce as session key */ | |
677 | memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE); | |
678 | /* and make len as that of session key only */ | |
679 | ses->auth_key.len = CIFS_SESS_KEY_SIZE; | |
680 | ||
681 | crypto_free_blkcipher(tfm_arc4); | |
682 | ||
14cae324 | 683 | return rc; |
d2b91521 SP |
684 | } |
685 | ||
686 | void | |
687 | cifs_crypto_shash_release(struct TCP_Server_Info *server) | |
688 | { | |
3c1bf7e4 PS |
689 | if (server->secmech.hmacsha256) |
690 | crypto_free_shash(server->secmech.hmacsha256); | |
691 | ||
d2b91521 SP |
692 | if (server->secmech.md5) |
693 | crypto_free_shash(server->secmech.md5); | |
694 | ||
695 | if (server->secmech.hmacmd5) | |
696 | crypto_free_shash(server->secmech.hmacmd5); | |
697 | ||
3c1bf7e4 PS |
698 | kfree(server->secmech.sdeschmacsha256); |
699 | ||
d2b91521 SP |
700 | kfree(server->secmech.sdeschmacmd5); |
701 | ||
702 | kfree(server->secmech.sdescmd5); | |
703 | } | |
704 | ||
705 | int | |
706 | cifs_crypto_shash_allocate(struct TCP_Server_Info *server) | |
707 | { | |
708 | int rc; | |
709 | unsigned int size; | |
710 | ||
711 | server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0); | |
ee2c9258 | 712 | if (IS_ERR(server->secmech.hmacmd5)) { |
ac3aa2f8 | 713 | cERROR(1, "could not allocate crypto hmacmd5"); |
d2b91521 SP |
714 | return PTR_ERR(server->secmech.hmacmd5); |
715 | } | |
716 | ||
717 | server->secmech.md5 = crypto_alloc_shash("md5", 0, 0); | |
ee2c9258 | 718 | if (IS_ERR(server->secmech.md5)) { |
ac3aa2f8 | 719 | cERROR(1, "could not allocate crypto md5"); |
d2b91521 SP |
720 | rc = PTR_ERR(server->secmech.md5); |
721 | goto crypto_allocate_md5_fail; | |
722 | } | |
723 | ||
3c1bf7e4 PS |
724 | server->secmech.hmacsha256 = crypto_alloc_shash("hmac(sha256)", 0, 0); |
725 | if (IS_ERR(server->secmech.hmacsha256)) { | |
726 | cERROR(1, "could not allocate crypto hmacsha256\n"); | |
727 | rc = PTR_ERR(server->secmech.hmacsha256); | |
728 | goto crypto_allocate_hmacsha256_fail; | |
729 | } | |
730 | ||
d2b91521 SP |
731 | size = sizeof(struct shash_desc) + |
732 | crypto_shash_descsize(server->secmech.hmacmd5); | |
733 | server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL); | |
734 | if (!server->secmech.sdeschmacmd5) { | |
ac3aa2f8 | 735 | cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5"); |
d2b91521 SP |
736 | rc = -ENOMEM; |
737 | goto crypto_allocate_hmacmd5_sdesc_fail; | |
738 | } | |
739 | server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5; | |
740 | server->secmech.sdeschmacmd5->shash.flags = 0x0; | |
741 | ||
d2b91521 SP |
742 | size = sizeof(struct shash_desc) + |
743 | crypto_shash_descsize(server->secmech.md5); | |
744 | server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL); | |
745 | if (!server->secmech.sdescmd5) { | |
ac3aa2f8 | 746 | cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5"); |
d2b91521 SP |
747 | rc = -ENOMEM; |
748 | goto crypto_allocate_md5_sdesc_fail; | |
749 | } | |
750 | server->secmech.sdescmd5->shash.tfm = server->secmech.md5; | |
751 | server->secmech.sdescmd5->shash.flags = 0x0; | |
752 | ||
3c1bf7e4 PS |
753 | size = sizeof(struct shash_desc) + |
754 | crypto_shash_descsize(server->secmech.hmacsha256); | |
755 | server->secmech.sdeschmacsha256 = kmalloc(size, GFP_KERNEL); | |
756 | if (!server->secmech.sdeschmacsha256) { | |
757 | cERROR(1, "%s: Can't alloc hmacsha256\n", __func__); | |
758 | rc = -ENOMEM; | |
759 | goto crypto_allocate_hmacsha256_sdesc_fail; | |
760 | } | |
761 | server->secmech.sdeschmacsha256->shash.tfm = server->secmech.hmacsha256; | |
762 | server->secmech.sdeschmacsha256->shash.flags = 0x0; | |
763 | ||
d2b91521 SP |
764 | return 0; |
765 | ||
3c1bf7e4 PS |
766 | crypto_allocate_hmacsha256_sdesc_fail: |
767 | kfree(server->secmech.sdescmd5); | |
768 | ||
d2b91521 SP |
769 | crypto_allocate_md5_sdesc_fail: |
770 | kfree(server->secmech.sdeschmacmd5); | |
771 | ||
772 | crypto_allocate_hmacmd5_sdesc_fail: | |
3c1bf7e4 PS |
773 | crypto_free_shash(server->secmech.hmacsha256); |
774 | ||
775 | crypto_allocate_hmacsha256_fail: | |
d2b91521 SP |
776 | crypto_free_shash(server->secmech.md5); |
777 | ||
778 | crypto_allocate_md5_fail: | |
779 | crypto_free_shash(server->secmech.hmacmd5); | |
780 | ||
781 | return rc; | |
782 | } |