Commit | Line | Data |
---|---|---|
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) { | |
14cae324 | 55 | cERROR(1, "%s: Could not init md5\n", __func__); |
307fbd31 SP |
56 | return rc; |
57 | } | |
58 | ||
14cae324 | 59 | rc = crypto_shash_update(&server->secmech.sdescmd5->shash, |
307fbd31 | 60 | server->session_key.response, server->session_key.len); |
14cae324 SP |
61 | if (rc) { |
62 | cERROR(1, "%s: Could not update with response\n", __func__); | |
63 | return rc; | |
64 | } | |
307fbd31 | 65 | |
14cae324 | 66 | rc = crypto_shash_update(&server->secmech.sdescmd5->shash, |
be8e3b00 | 67 | cifs_pdu->Protocol, be32_to_cpu(cifs_pdu->smb_buf_length)); |
14cae324 SP |
68 | if (rc) { |
69 | cERROR(1, "%s: Could not update with payload\n", __func__); | |
70 | return rc; | |
71 | } | |
307fbd31 SP |
72 | |
73 | rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature); | |
14cae324 SP |
74 | if (rc) |
75 | cERROR(1, "%s: Could not generate md5 hash\n", __func__); | |
b609f06a | 76 | |
14cae324 | 77 | return rc; |
1da177e4 LT |
78 | } |
79 | ||
a0f8b4fb | 80 | /* must be called with server->srv_mutex held */ |
ffdd6e4d SF |
81 | int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server, |
82 | __u32 *pexpected_response_sequence_number) | |
1da177e4 LT |
83 | { |
84 | int rc = 0; | |
85 | char smb_signature[20]; | |
86 | ||
ffdd6e4d | 87 | if ((cifs_pdu == NULL) || (server == NULL)) |
1da177e4 LT |
88 | return -EINVAL; |
89 | ||
ffdd6e4d | 90 | if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0) |
1da177e4 LT |
91 | return rc; |
92 | ||
50c2f753 SF |
93 | cifs_pdu->Signature.Sequence.SequenceNumber = |
94 | cpu_to_le32(server->sequence_number); | |
1da177e4 | 95 | cifs_pdu->Signature.Sequence.Reserved = 0; |
50c2f753 | 96 | |
ad009ac9 SF |
97 | *pexpected_response_sequence_number = server->sequence_number++; |
98 | server->sequence_number++; | |
1da177e4 | 99 | |
21e73393 | 100 | rc = cifs_calculate_signature(cifs_pdu, server, smb_signature); |
ffdd6e4d | 101 | if (rc) |
1da177e4 LT |
102 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); |
103 | else | |
104 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
105 | ||
106 | return rc; | |
107 | } | |
108 | ||
ffdd6e4d | 109 | static int cifs_calc_signature2(const struct kvec *iov, int n_vec, |
21e73393 | 110 | struct TCP_Server_Info *server, char *signature) |
84afc29b | 111 | { |
e9917a00 | 112 | int i; |
307fbd31 | 113 | int rc; |
84afc29b | 114 | |
21e73393 | 115 | if (iov == NULL || signature == NULL || server == NULL) |
e9917a00 | 116 | return -EINVAL; |
84afc29b | 117 | |
307fbd31 SP |
118 | if (!server->secmech.sdescmd5) { |
119 | cERROR(1, "%s: Can't generate signature\n", __func__); | |
120 | return -1; | |
121 | } | |
122 | ||
123 | rc = crypto_shash_init(&server->secmech.sdescmd5->shash); | |
124 | if (rc) { | |
14cae324 | 125 | cERROR(1, "%s: Could not init md5\n", __func__); |
307fbd31 SP |
126 | return rc; |
127 | } | |
128 | ||
14cae324 | 129 | rc = crypto_shash_update(&server->secmech.sdescmd5->shash, |
307fbd31 | 130 | server->session_key.response, server->session_key.len); |
14cae324 SP |
131 | if (rc) { |
132 | cERROR(1, "%s: Could not update with response\n", __func__); | |
133 | return rc; | |
134 | } | |
307fbd31 | 135 | |
50c2f753 | 136 | for (i = 0; i < n_vec; i++) { |
745542e2 JL |
137 | if (iov[i].iov_len == 0) |
138 | continue; | |
ffdd6e4d | 139 | if (iov[i].iov_base == NULL) { |
56234e27 | 140 | cERROR(1, "null iovec entry"); |
e9917a00 | 141 | return -EIO; |
745542e2 | 142 | } |
ffdd6e4d | 143 | /* The first entry includes a length field (which does not get |
e9917a00 | 144 | signed that occupies the first 4 bytes before the header */ |
ffdd6e4d | 145 | if (i == 0) { |
63d2583f | 146 | if (iov[0].iov_len <= 8) /* cmd field at offset 9 */ |
e9917a00 | 147 | break; /* nothing to sign or corrupt header */ |
14cae324 | 148 | rc = |
307fbd31 SP |
149 | crypto_shash_update(&server->secmech.sdescmd5->shash, |
150 | iov[i].iov_base + 4, iov[i].iov_len - 4); | |
14cae324 SP |
151 | } else { |
152 | rc = | |
307fbd31 SP |
153 | crypto_shash_update(&server->secmech.sdescmd5->shash, |
154 | iov[i].iov_base, iov[i].iov_len); | |
14cae324 SP |
155 | } |
156 | if (rc) { | |
157 | cERROR(1, "%s: Could not update with payload\n", | |
158 | __func__); | |
159 | return rc; | |
160 | } | |
e9917a00 | 161 | } |
84afc29b | 162 | |
307fbd31 | 163 | rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature); |
14cae324 SP |
164 | if (rc) |
165 | cERROR(1, "%s: Could not generate md5 hash\n", __func__); | |
84afc29b | 166 | |
307fbd31 | 167 | return rc; |
84afc29b SF |
168 | } |
169 | ||
a0f8b4fb | 170 | /* must be called with server->srv_mutex held */ |
ffdd6e4d | 171 | int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server, |
63d2583f | 172 | __u32 *pexpected_response_sequence_number) |
84afc29b SF |
173 | { |
174 | int rc = 0; | |
175 | char smb_signature[20]; | |
ffdd6e4d | 176 | struct smb_hdr *cifs_pdu = iov[0].iov_base; |
84afc29b | 177 | |
ffdd6e4d | 178 | if ((cifs_pdu == NULL) || (server == NULL)) |
84afc29b SF |
179 | return -EINVAL; |
180 | ||
ffdd6e4d | 181 | if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0) |
84afc29b SF |
182 | return rc; |
183 | ||
ffdd6e4d | 184 | cifs_pdu->Signature.Sequence.SequenceNumber = |
84afc29b | 185 | cpu_to_le32(server->sequence_number); |
ffdd6e4d | 186 | cifs_pdu->Signature.Sequence.Reserved = 0; |
84afc29b | 187 | |
ffdd6e4d SF |
188 | *pexpected_response_sequence_number = server->sequence_number++; |
189 | server->sequence_number++; | |
84afc29b | 190 | |
21e73393 | 191 | rc = cifs_calc_signature2(iov, n_vec, server, smb_signature); |
ffdd6e4d SF |
192 | if (rc) |
193 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |
194 | else | |
195 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
84afc29b | 196 | |
ffdd6e4d | 197 | return rc; |
84afc29b SF |
198 | } |
199 | ||
b609f06a | 200 | int cifs_verify_signature(struct smb_hdr *cifs_pdu, |
21e73393 | 201 | struct TCP_Server_Info *server, |
ffdd6e4d | 202 | __u32 expected_sequence_number) |
1da177e4 | 203 | { |
c8e56f1f | 204 | unsigned int rc; |
1da177e4 LT |
205 | char server_response_sig[8]; |
206 | char what_we_think_sig_should_be[20]; | |
207 | ||
21e73393 | 208 | if (cifs_pdu == NULL || server == NULL) |
1da177e4 LT |
209 | return -EINVAL; |
210 | ||
9c4843ea | 211 | if (!server->session_estab) |
1da177e4 LT |
212 | return 0; |
213 | ||
214 | if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) { | |
50c2f753 | 215 | struct smb_com_lock_req *pSMB = |
ffdd6e4d SF |
216 | (struct smb_com_lock_req *)cifs_pdu; |
217 | if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) | |
1da177e4 LT |
218 | return 0; |
219 | } | |
220 | ||
50c2f753 SF |
221 | /* BB what if signatures are supposed to be on for session but |
222 | server does not send one? BB */ | |
223 | ||
1da177e4 | 224 | /* Do not need to verify session setups with signature "BSRSPYL " */ |
50c2f753 | 225 | if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0) |
b6b38f70 JP |
226 | cFYI(1, "dummy signature received for smb command 0x%x", |
227 | cifs_pdu->Command); | |
1da177e4 LT |
228 | |
229 | /* save off the origiginal signature so we can modify the smb and check | |
230 | its signature against what the server sent */ | |
50c2f753 | 231 | memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8); |
1da177e4 | 232 | |
50c2f753 SF |
233 | cifs_pdu->Signature.Sequence.SequenceNumber = |
234 | cpu_to_le32(expected_sequence_number); | |
1da177e4 LT |
235 | cifs_pdu->Signature.Sequence.Reserved = 0; |
236 | ||
157c2491 | 237 | mutex_lock(&server->srv_mutex); |
21e73393 | 238 | rc = cifs_calculate_signature(cifs_pdu, server, |
1da177e4 | 239 | what_we_think_sig_should_be); |
157c2491 | 240 | mutex_unlock(&server->srv_mutex); |
1da177e4 | 241 | |
50c2f753 | 242 | if (rc) |
1da177e4 LT |
243 | return rc; |
244 | ||
50c2f753 SF |
245 | /* cifs_dump_mem("what we think it should be: ", |
246 | what_we_think_sig_should_be, 16); */ | |
1da177e4 | 247 | |
50c2f753 | 248 | if (memcmp(server_response_sig, what_we_think_sig_should_be, 8)) |
1da177e4 LT |
249 | return -EACCES; |
250 | else | |
251 | return 0; | |
252 | ||
253 | } | |
254 | ||
21e73393 | 255 | /* first calculate 24 bytes ntlm response and then 16 byte session key */ |
96daf2b0 | 256 | int setup_ntlm_response(struct cifs_ses *ses) |
1da177e4 | 257 | { |
ee2c9258 | 258 | int rc = 0; |
21e73393 SP |
259 | unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE; |
260 | char temp_key[CIFS_SESS_KEY_SIZE]; | |
261 | ||
262 | if (!ses) | |
1da177e4 LT |
263 | return -EINVAL; |
264 | ||
21e73393 SP |
265 | ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL); |
266 | if (!ses->auth_key.response) { | |
267 | cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len); | |
268 | return -ENOMEM; | |
269 | } | |
270 | ses->auth_key.len = temp_len; | |
271 | ||
ee2c9258 | 272 | rc = SMBNTencrypt(ses->password, ses->server->cryptkey, |
21e73393 | 273 | ses->auth_key.response + CIFS_SESS_KEY_SIZE); |
ee2c9258 SP |
274 | if (rc) { |
275 | cFYI(1, "%s Can't generate NTLM response, error: %d", | |
276 | __func__, rc); | |
277 | return rc; | |
278 | } | |
279 | ||
280 | rc = E_md4hash(ses->password, temp_key); | |
281 | if (rc) { | |
282 | cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc); | |
283 | return rc; | |
284 | } | |
21e73393 | 285 | |
ee2c9258 SP |
286 | rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE); |
287 | if (rc) | |
288 | cFYI(1, "%s Can't generate NTLM session key, error: %d", | |
289 | __func__, rc); | |
21e73393 | 290 | |
ee2c9258 | 291 | return rc; |
1da177e4 LT |
292 | } |
293 | ||
7c7b25bc | 294 | #ifdef CONFIG_CIFS_WEAK_PW_HASH |
43988d76 | 295 | int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt, |
4e53a3fb | 296 | char *lnm_session_key) |
7c7b25bc SF |
297 | { |
298 | int i; | |
43988d76 | 299 | int rc; |
7c7b25bc SF |
300 | char password_with_pad[CIFS_ENCPWD_SIZE]; |
301 | ||
302 | memset(password_with_pad, 0, CIFS_ENCPWD_SIZE); | |
4e53a3fb JL |
303 | if (password) |
304 | strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE); | |
305 | ||
04912d6a | 306 | if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) { |
4e53a3fb JL |
307 | memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE); |
308 | memcpy(lnm_session_key, password_with_pad, | |
309 | CIFS_ENCPWD_SIZE); | |
43988d76 | 310 | return 0; |
4e53a3fb | 311 | } |
bdc4bf6e | 312 | |
7c7b25bc SF |
313 | /* calculate old style session key */ |
314 | /* calling toupper is less broken than repeatedly | |
315 | calling nls_toupper would be since that will never | |
316 | work for UTF8, but neither handles multibyte code pages | |
317 | but the only alternative would be converting to UCS-16 (Unicode) | |
318 | (using a routine something like UniStrupr) then | |
319 | uppercasing and then converting back from Unicode - which | |
320 | would only worth doing it if we knew it were utf8. Basically | |
321 | utf8 and other multibyte codepages each need their own strupper | |
322 | function since a byte at a time will ont work. */ | |
323 | ||
ef571cad | 324 | for (i = 0; i < CIFS_ENCPWD_SIZE; i++) |
7c7b25bc | 325 | password_with_pad[i] = toupper(password_with_pad[i]); |
7c7b25bc | 326 | |
43988d76 | 327 | rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key); |
4e53a3fb | 328 | |
43988d76 | 329 | return rc; |
7c7b25bc SF |
330 | } |
331 | #endif /* CIFS_WEAK_PW_HASH */ | |
332 | ||
9daa42e2 SP |
333 | /* Build a proper attribute value/target info pairs blob. |
334 | * Fill in netbios and dns domain name and workstation name | |
335 | * and client time (total five av pairs and + one end of fields indicator. | |
336 | * Allocate domain name which gets freed when session struct is deallocated. | |
2b149f11 SP |
337 | */ |
338 | static int | |
96daf2b0 | 339 | build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 | 340 | { |
9daa42e2 SP |
341 | unsigned int dlen; |
342 | unsigned int wlen; | |
343 | unsigned int size = 6 * sizeof(struct ntlmssp2_name); | |
344 | __le64 curtime; | |
345 | char *defdmname = "WORKGROUP"; | |
346 | unsigned char *blobptr; | |
2b149f11 SP |
347 | struct ntlmssp2_name *attrptr; |
348 | ||
9daa42e2 SP |
349 | if (!ses->domainName) { |
350 | ses->domainName = kstrdup(defdmname, GFP_KERNEL); | |
351 | if (!ses->domainName) | |
352 | return -ENOMEM; | |
353 | } | |
354 | ||
355 | dlen = strlen(ses->domainName); | |
356 | wlen = strlen(ses->server->hostname); | |
357 | ||
358 | /* The length of this blob is a size which is | |
359 | * six times the size of a structure which holds name/size + | |
360 | * two times the unicode length of a domain name + | |
361 | * two times the unicode length of a server name + | |
362 | * size of a timestamp (which is 8 bytes). | |
363 | */ | |
d3686d54 SP |
364 | ses->auth_key.len = size + 2 * (2 * dlen) + 2 * (2 * wlen) + 8; |
365 | ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL); | |
366 | if (!ses->auth_key.response) { | |
367 | ses->auth_key.len = 0; | |
2b149f11 SP |
368 | cERROR(1, "Challenge target info allocation failure"); |
369 | return -ENOMEM; | |
370 | } | |
9daa42e2 | 371 | |
d3686d54 | 372 | blobptr = ses->auth_key.response; |
9daa42e2 SP |
373 | attrptr = (struct ntlmssp2_name *) blobptr; |
374 | ||
375 | attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME); | |
376 | attrptr->length = cpu_to_le16(2 * dlen); | |
377 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
378 | cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp); | |
379 | ||
380 | blobptr += 2 * dlen; | |
381 | attrptr = (struct ntlmssp2_name *) blobptr; | |
382 | ||
383 | attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_COMPUTER_NAME); | |
384 | attrptr->length = cpu_to_le16(2 * wlen); | |
385 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
386 | cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp); | |
387 | ||
388 | blobptr += 2 * wlen; | |
389 | attrptr = (struct ntlmssp2_name *) blobptr; | |
390 | ||
391 | attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_DOMAIN_NAME); | |
392 | attrptr->length = cpu_to_le16(2 * dlen); | |
393 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
394 | cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp); | |
395 | ||
396 | blobptr += 2 * dlen; | |
397 | attrptr = (struct ntlmssp2_name *) blobptr; | |
398 | ||
399 | attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_COMPUTER_NAME); | |
400 | attrptr->length = cpu_to_le16(2 * wlen); | |
401 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
402 | cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp); | |
403 | ||
404 | blobptr += 2 * wlen; | |
405 | attrptr = (struct ntlmssp2_name *) blobptr; | |
406 | ||
407 | attrptr->type = cpu_to_le16(NTLMSSP_AV_TIMESTAMP); | |
408 | attrptr->length = cpu_to_le16(sizeof(__le64)); | |
409 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
410 | curtime = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME)); | |
411 | memcpy(blobptr, &curtime, sizeof(__le64)); | |
2b149f11 SP |
412 | |
413 | return 0; | |
414 | } | |
415 | ||
416 | /* Server has provided av pairs/target info in the type 2 challenge | |
417 | * packet and we have plucked it and stored within smb session. | |
418 | * We parse that blob here to find netbios domain name to be used | |
419 | * as part of ntlmv2 authentication (in Target String), if not already | |
420 | * specified on the command line. | |
421 | * If this function returns without any error but without fetching | |
422 | * domain name, authentication may fail against some server but | |
423 | * may not fail against other (those who are not very particular | |
424 | * about target string i.e. for some, just user name might suffice. | |
425 | */ | |
426 | static int | |
96daf2b0 | 427 | find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 SP |
428 | { |
429 | unsigned int attrsize; | |
430 | unsigned int type; | |
431 | unsigned int onesize = sizeof(struct ntlmssp2_name); | |
432 | unsigned char *blobptr; | |
433 | unsigned char *blobend; | |
434 | struct ntlmssp2_name *attrptr; | |
435 | ||
d3686d54 | 436 | if (!ses->auth_key.len || !ses->auth_key.response) |
2b149f11 SP |
437 | return 0; |
438 | ||
d3686d54 SP |
439 | blobptr = ses->auth_key.response; |
440 | blobend = blobptr + ses->auth_key.len; | |
2b149f11 SP |
441 | |
442 | while (blobptr + onesize < blobend) { | |
443 | attrptr = (struct ntlmssp2_name *) blobptr; | |
444 | type = le16_to_cpu(attrptr->type); | |
445 | if (type == NTLMSSP_AV_EOL) | |
446 | break; | |
447 | blobptr += 2; /* advance attr type */ | |
448 | attrsize = le16_to_cpu(attrptr->length); | |
449 | blobptr += 2; /* advance attr size */ | |
450 | if (blobptr + attrsize > blobend) | |
451 | break; | |
452 | if (type == NTLMSSP_AV_NB_DOMAIN_NAME) { | |
453 | if (!attrsize) | |
454 | break; | |
455 | if (!ses->domainName) { | |
456 | ses->domainName = | |
457 | kmalloc(attrsize + 1, GFP_KERNEL); | |
458 | if (!ses->domainName) | |
459 | return -ENOMEM; | |
460 | cifs_from_ucs2(ses->domainName, | |
461 | (__le16 *)blobptr, attrsize, attrsize, | |
f7c5445a | 462 | nls_cp, false); |
2b149f11 SP |
463 | break; |
464 | } | |
465 | } | |
466 | blobptr += attrsize; /* advance attr value */ | |
467 | } | |
468 | ||
469 | return 0; | |
470 | } | |
471 | ||
96daf2b0 | 472 | static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash, |
50c2f753 | 473 | const struct nls_table *nls_cp) |
a8ee0344 SF |
474 | { |
475 | int rc = 0; | |
476 | int len; | |
307fbd31 | 477 | char nt_hash[CIFS_NTHASH_SIZE]; |
50c2f753 SF |
478 | wchar_t *user; |
479 | wchar_t *domain; | |
307fbd31 | 480 | wchar_t *server; |
a8ee0344 | 481 | |
307fbd31 SP |
482 | if (!ses->server->secmech.sdeschmacmd5) { |
483 | cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n"); | |
484 | return -1; | |
485 | } | |
56234e27 | 486 | |
c8e56f1f SF |
487 | /* calculate md4 hash of password */ |
488 | E_md4hash(ses->password, nt_hash); | |
9fbc5908 | 489 | |
14cae324 | 490 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash, |
307fbd31 | 491 | CIFS_NTHASH_SIZE); |
14cae324 SP |
492 | if (rc) { |
493 | cERROR(1, "%s: Could not set NT Hash as a key", __func__); | |
494 | return rc; | |
495 | } | |
307fbd31 SP |
496 | |
497 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
498 | if (rc) { | |
499 | cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5\n"); | |
500 | return rc; | |
501 | } | |
a8ee0344 | 502 | |
8727c8a8 SF |
503 | /* convert ses->user_name to unicode and uppercase */ |
504 | len = strlen(ses->user_name); | |
1717ffc5 | 505 | user = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 SP |
506 | if (user == NULL) { |
507 | cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n"); | |
508 | rc = -ENOMEM; | |
14cae324 | 509 | return rc; |
307fbd31 | 510 | } |
8727c8a8 | 511 | len = cifs_strtoUCS((__le16 *)user, ses->user_name, len, nls_cp); |
1717ffc5 | 512 | UniStrupr(user); |
307fbd31 | 513 | |
14cae324 | 514 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 | 515 | (char *)user, 2 * len); |
14cae324 SP |
516 | kfree(user); |
517 | if (rc) { | |
518 | cERROR(1, "%s: Could not update with user\n", __func__); | |
519 | return rc; | |
520 | } | |
a8ee0344 SF |
521 | |
522 | /* convert ses->domainName to unicode and uppercase */ | |
50c2f753 | 523 | if (ses->domainName) { |
1717ffc5 | 524 | len = strlen(ses->domainName); |
a8ee0344 | 525 | |
50c2f753 | 526 | domain = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 SP |
527 | if (domain == NULL) { |
528 | cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure"); | |
529 | rc = -ENOMEM; | |
14cae324 | 530 | return rc; |
307fbd31 | 531 | } |
8f2376ad CG |
532 | len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len, |
533 | nls_cp); | |
14cae324 | 534 | rc = |
307fbd31 SP |
535 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
536 | (char *)domain, 2 * len); | |
1717ffc5 | 537 | kfree(domain); |
14cae324 SP |
538 | if (rc) { |
539 | cERROR(1, "%s: Could not update with domain\n", | |
540 | __func__); | |
541 | return rc; | |
542 | } | |
307fbd31 SP |
543 | } else if (ses->serverName) { |
544 | len = strlen(ses->serverName); | |
545 | ||
546 | server = kmalloc(2 + (len * 2), GFP_KERNEL); | |
547 | if (server == NULL) { | |
548 | cERROR(1, "calc_ntlmv2_hash: server mem alloc failure"); | |
549 | rc = -ENOMEM; | |
14cae324 | 550 | return rc; |
307fbd31 SP |
551 | } |
552 | len = cifs_strtoUCS((__le16 *)server, ses->serverName, len, | |
553 | nls_cp); | |
14cae324 | 554 | rc = |
307fbd31 SP |
555 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
556 | (char *)server, 2 * len); | |
557 | kfree(server); | |
14cae324 SP |
558 | if (rc) { |
559 | cERROR(1, "%s: Could not update with server\n", | |
560 | __func__); | |
561 | return rc; | |
562 | } | |
1717ffc5 | 563 | } |
307fbd31 SP |
564 | |
565 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
d3686d54 | 566 | ntlmv2_hash); |
14cae324 SP |
567 | if (rc) |
568 | cERROR(1, "%s: Could not generate md5 hash\n", __func__); | |
307fbd31 | 569 | |
307fbd31 SP |
570 | return rc; |
571 | } | |
572 | ||
573 | static int | |
96daf2b0 | 574 | CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash) |
307fbd31 SP |
575 | { |
576 | int rc; | |
577 | unsigned int offset = CIFS_SESS_KEY_SIZE + 8; | |
578 | ||
579 | if (!ses->server->secmech.sdeschmacmd5) { | |
580 | cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n"); | |
581 | return -1; | |
582 | } | |
583 | ||
14cae324 | 584 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
d3686d54 | 585 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 SP |
586 | if (rc) { |
587 | cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__); | |
588 | return rc; | |
589 | } | |
307fbd31 SP |
590 | |
591 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
592 | if (rc) { | |
593 | cERROR(1, "CalcNTLMv2_response: could not init hmacmd5"); | |
594 | return rc; | |
595 | } | |
596 | ||
d3ba50b1 SP |
597 | if (ses->server->secType == RawNTLMSSP) |
598 | memcpy(ses->auth_key.response + offset, | |
d3686d54 | 599 | ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); |
d3ba50b1 SP |
600 | else |
601 | memcpy(ses->auth_key.response + offset, | |
602 | ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); | |
14cae324 | 603 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 | 604 | ses->auth_key.response + offset, ses->auth_key.len - offset); |
14cae324 SP |
605 | if (rc) { |
606 | cERROR(1, "%s: Could not update with response\n", __func__); | |
607 | return rc; | |
608 | } | |
307fbd31 SP |
609 | |
610 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
611 | ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
14cae324 SP |
612 | if (rc) |
613 | cERROR(1, "%s: Could not generate md5 hash\n", __func__); | |
9fbc5908 SF |
614 | |
615 | return rc; | |
616 | } | |
617 | ||
307fbd31 | 618 | |
2b149f11 | 619 | int |
96daf2b0 | 620 | setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp) |
9fbc5908 | 621 | { |
c8e56f1f | 622 | int rc; |
21e73393 | 623 | int baselen; |
d3686d54 | 624 | unsigned int tilen; |
21e73393 | 625 | struct ntlmv2_resp *buf; |
d3686d54 SP |
626 | char ntlmv2_hash[16]; |
627 | unsigned char *tiblob = NULL; /* target info blob */ | |
6d027cfd | 628 | |
2b149f11 SP |
629 | if (ses->server->secType == RawNTLMSSP) { |
630 | if (!ses->domainName) { | |
f7c5445a | 631 | rc = find_domain_name(ses, nls_cp); |
2b149f11 SP |
632 | if (rc) { |
633 | cERROR(1, "error %d finding domain name", rc); | |
634 | goto setup_ntlmv2_rsp_ret; | |
635 | } | |
636 | } | |
637 | } else { | |
9daa42e2 | 638 | rc = build_avpair_blob(ses, nls_cp); |
2b149f11 SP |
639 | if (rc) { |
640 | cERROR(1, "error %d building av pair blob", rc); | |
d3686d54 | 641 | goto setup_ntlmv2_rsp_ret; |
2b149f11 SP |
642 | } |
643 | } | |
a8ee0344 | 644 | |
21e73393 | 645 | baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp); |
d3686d54 SP |
646 | tilen = ses->auth_key.len; |
647 | tiblob = ses->auth_key.response; | |
648 | ||
649 | ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL); | |
21e73393 SP |
650 | if (!ses->auth_key.response) { |
651 | rc = ENOMEM; | |
d3686d54 | 652 | ses->auth_key.len = 0; |
21e73393 SP |
653 | cERROR(1, "%s: Can't allocate auth blob", __func__); |
654 | goto setup_ntlmv2_rsp_ret; | |
655 | } | |
d3686d54 | 656 | ses->auth_key.len += baselen; |
21e73393 SP |
657 | |
658 | buf = (struct ntlmv2_resp *) | |
659 | (ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
660 | buf->blob_signature = cpu_to_le32(0x00000101); | |
661 | buf->reserved = 0; | |
662 | buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME)); | |
663 | get_random_bytes(&buf->client_chal, sizeof(buf->client_chal)); | |
664 | buf->reserved2 = 0; | |
665 | ||
d3686d54 | 666 | memcpy(ses->auth_key.response + baselen, tiblob, tilen); |
21e73393 | 667 | |
f7c5445a | 668 | /* calculate ntlmv2_hash */ |
d3686d54 | 669 | rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp); |
2b149f11 | 670 | if (rc) { |
b6b38f70 | 671 | cERROR(1, "could not get v2 hash rc %d", rc); |
2b149f11 SP |
672 | goto setup_ntlmv2_rsp_ret; |
673 | } | |
f7c5445a SP |
674 | |
675 | /* calculate first part of the client response (CR1) */ | |
d3686d54 | 676 | rc = CalcNTLMv2_response(ses, ntlmv2_hash); |
307fbd31 SP |
677 | if (rc) { |
678 | cERROR(1, "Could not calculate CR1 rc: %d", rc); | |
679 | goto setup_ntlmv2_rsp_ret; | |
680 | } | |
b609f06a | 681 | |
5d0d2882 | 682 | /* now calculate the session key for NTLMv2 */ |
14cae324 | 683 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
d3686d54 | 684 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 SP |
685 | if (rc) { |
686 | cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__); | |
687 | goto setup_ntlmv2_rsp_ret; | |
688 | } | |
307fbd31 SP |
689 | |
690 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
691 | if (rc) { | |
692 | cERROR(1, "%s: Could not init hmacmd5\n", __func__); | |
693 | goto setup_ntlmv2_rsp_ret; | |
694 | } | |
695 | ||
14cae324 | 696 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 SP |
697 | ses->auth_key.response + CIFS_SESS_KEY_SIZE, |
698 | CIFS_HMAC_MD5_HASH_SIZE); | |
14cae324 SP |
699 | if (rc) { |
700 | cERROR(1, "%s: Could not update with response\n", __func__); | |
701 | goto setup_ntlmv2_rsp_ret; | |
702 | } | |
307fbd31 SP |
703 | |
704 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
705 | ses->auth_key.response); | |
14cae324 SP |
706 | if (rc) |
707 | cERROR(1, "%s: Could not generate md5 hash\n", __func__); | |
2b149f11 | 708 | |
2b149f11 | 709 | setup_ntlmv2_rsp_ret: |
d3686d54 | 710 | kfree(tiblob); |
2b149f11 SP |
711 | |
712 | return rc; | |
6d027cfd SF |
713 | } |
714 | ||
d2b91521 | 715 | int |
96daf2b0 | 716 | calc_seckey(struct cifs_ses *ses) |
d2b91521 SP |
717 | { |
718 | int rc; | |
719 | struct crypto_blkcipher *tfm_arc4; | |
720 | struct scatterlist sgin, sgout; | |
721 | struct blkcipher_desc desc; | |
722 | unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */ | |
723 | ||
724 | get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE); | |
725 | ||
726 | tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC); | |
7a8587e7 SP |
727 | if (IS_ERR(tfm_arc4)) { |
728 | rc = PTR_ERR(tfm_arc4); | |
d2b91521 | 729 | cERROR(1, "could not allocate crypto API arc4\n"); |
7a8587e7 | 730 | return rc; |
d2b91521 SP |
731 | } |
732 | ||
733 | desc.tfm = tfm_arc4; | |
734 | ||
14cae324 | 735 | rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response, |
d2b91521 | 736 | CIFS_SESS_KEY_SIZE); |
14cae324 SP |
737 | if (rc) { |
738 | cERROR(1, "%s: Could not set response as a key", __func__); | |
739 | return rc; | |
740 | } | |
d2b91521 SP |
741 | |
742 | sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE); | |
d3686d54 | 743 | sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); |
d2b91521 SP |
744 | |
745 | rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE); | |
746 | if (rc) { | |
747 | cERROR(1, "could not encrypt session key rc: %d\n", rc); | |
748 | crypto_free_blkcipher(tfm_arc4); | |
749 | return rc; | |
750 | } | |
751 | ||
752 | /* make secondary_key/nonce as session key */ | |
753 | memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE); | |
754 | /* and make len as that of session key only */ | |
755 | ses->auth_key.len = CIFS_SESS_KEY_SIZE; | |
756 | ||
757 | crypto_free_blkcipher(tfm_arc4); | |
758 | ||
14cae324 | 759 | return rc; |
d2b91521 SP |
760 | } |
761 | ||
762 | void | |
763 | cifs_crypto_shash_release(struct TCP_Server_Info *server) | |
764 | { | |
765 | if (server->secmech.md5) | |
766 | crypto_free_shash(server->secmech.md5); | |
767 | ||
768 | if (server->secmech.hmacmd5) | |
769 | crypto_free_shash(server->secmech.hmacmd5); | |
770 | ||
771 | kfree(server->secmech.sdeschmacmd5); | |
772 | ||
773 | kfree(server->secmech.sdescmd5); | |
774 | } | |
775 | ||
776 | int | |
777 | cifs_crypto_shash_allocate(struct TCP_Server_Info *server) | |
778 | { | |
779 | int rc; | |
780 | unsigned int size; | |
781 | ||
782 | server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0); | |
ee2c9258 | 783 | if (IS_ERR(server->secmech.hmacmd5)) { |
d2b91521 SP |
784 | cERROR(1, "could not allocate crypto hmacmd5\n"); |
785 | return PTR_ERR(server->secmech.hmacmd5); | |
786 | } | |
787 | ||
788 | server->secmech.md5 = crypto_alloc_shash("md5", 0, 0); | |
ee2c9258 | 789 | if (IS_ERR(server->secmech.md5)) { |
d2b91521 SP |
790 | cERROR(1, "could not allocate crypto md5\n"); |
791 | rc = PTR_ERR(server->secmech.md5); | |
792 | goto crypto_allocate_md5_fail; | |
793 | } | |
794 | ||
795 | size = sizeof(struct shash_desc) + | |
796 | crypto_shash_descsize(server->secmech.hmacmd5); | |
797 | server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL); | |
798 | if (!server->secmech.sdeschmacmd5) { | |
799 | cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5\n"); | |
800 | rc = -ENOMEM; | |
801 | goto crypto_allocate_hmacmd5_sdesc_fail; | |
802 | } | |
803 | server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5; | |
804 | server->secmech.sdeschmacmd5->shash.flags = 0x0; | |
805 | ||
806 | ||
807 | size = sizeof(struct shash_desc) + | |
808 | crypto_shash_descsize(server->secmech.md5); | |
809 | server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL); | |
810 | if (!server->secmech.sdescmd5) { | |
811 | cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5\n"); | |
812 | rc = -ENOMEM; | |
813 | goto crypto_allocate_md5_sdesc_fail; | |
814 | } | |
815 | server->secmech.sdescmd5->shash.tfm = server->secmech.md5; | |
816 | server->secmech.sdescmd5->shash.flags = 0x0; | |
817 | ||
818 | return 0; | |
819 | ||
820 | crypto_allocate_md5_sdesc_fail: | |
821 | kfree(server->secmech.sdeschmacmd5); | |
822 | ||
823 | crypto_allocate_hmacmd5_sdesc_fail: | |
824 | crypto_free_shash(server->secmech.md5); | |
825 | ||
826 | crypto_allocate_md5_fail: | |
827 | crypto_free_shash(server->secmech.hmacmd5); | |
828 | ||
829 | return rc; | |
830 | } |