Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/cifsencrypt.c | |
3 | * | |
8b7a4544 SF |
4 | * Encryption and hashing operations relating to NTLM, NTLMv2. See MS-NLMP |
5 | * for more detailed information | |
6 | * | |
95dc8dd1 | 7 | * Copyright (C) International Business Machines Corp., 2005,2013 |
1da177e4 LT |
8 | * Author(s): Steve French (sfrench@us.ibm.com) |
9 | * | |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | ||
25 | #include <linux/fs.h> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
1da177e4 | 27 | #include "cifspdu.h" |
ffdd6e4d | 28 | #include "cifsglob.h" |
1da177e4 | 29 | #include "cifs_debug.h" |
1da177e4 LT |
30 | #include "cifs_unicode.h" |
31 | #include "cifsproto.h" | |
2b149f11 | 32 | #include "ntlmssp.h" |
7c7b25bc | 33 | #include <linux/ctype.h> |
6d027cfd | 34 | #include <linux/random.h> |
fb308a6f | 35 | #include <linux/highmem.h> |
97a5fee2 AB |
36 | #include <linux/fips.h> |
37 | #include <crypto/arc4.h> | |
026e93dc | 38 | #include <crypto/aead.h> |
1da177e4 | 39 | |
16c568ef AV |
40 | int __cifs_calc_signature(struct smb_rqst *rqst, |
41 | struct TCP_Server_Info *server, char *signature, | |
42 | struct shash_desc *shash) | |
84afc29b | 43 | { |
e9917a00 | 44 | int i; |
307fbd31 | 45 | int rc; |
bf5ea0e2 JL |
46 | struct kvec *iov = rqst->rq_iov; |
47 | int n_vec = rqst->rq_nvec; | |
c713c877 | 48 | int is_smb2 = server->vals->header_preamble_size == 0; |
84afc29b | 49 | |
c713c877 RS |
50 | /* iov[0] is actual data and not the rfc1002 length for SMB2+ */ |
51 | if (is_smb2) { | |
83ffdead PA |
52 | if (iov[0].iov_len <= 4) |
53 | return -EIO; | |
54 | i = 0; | |
c713c877 RS |
55 | } else { |
56 | if (n_vec < 2 || iov[0].iov_len != 4) | |
57 | return -EIO; | |
83ffdead | 58 | i = 1; /* skip rfc1002 length */ |
c713c877 RS |
59 | } |
60 | ||
83ffdead | 61 | for (; i < n_vec; i++) { |
745542e2 JL |
62 | if (iov[i].iov_len == 0) |
63 | continue; | |
ffdd6e4d | 64 | if (iov[i].iov_base == NULL) { |
f96637be | 65 | cifs_dbg(VFS, "null iovec entry\n"); |
e9917a00 | 66 | return -EIO; |
745542e2 | 67 | } |
83ffdead | 68 | |
738f9de5 PS |
69 | rc = crypto_shash_update(shash, |
70 | iov[i].iov_base, iov[i].iov_len); | |
14cae324 | 71 | if (rc) { |
f96637be JP |
72 | cifs_dbg(VFS, "%s: Could not update with payload\n", |
73 | __func__); | |
14cae324 SP |
74 | return rc; |
75 | } | |
e9917a00 | 76 | } |
84afc29b | 77 | |
fb308a6f JL |
78 | /* now hash over the rq_pages array */ |
79 | for (i = 0; i < rqst->rq_npages; i++) { | |
4c0d2a5a LL |
80 | void *kaddr; |
81 | unsigned int len, offset; | |
16c568ef | 82 | |
4c0d2a5a LL |
83 | rqst_page_get_length(rqst, i, &len, &offset); |
84 | ||
85 | kaddr = (char *) kmap(rqst->rq_pages[i]) + offset; | |
16c568ef | 86 | |
a12d0c59 PA |
87 | rc = crypto_shash_update(shash, kaddr, len); |
88 | if (rc) { | |
89 | cifs_dbg(VFS, "%s: Could not update with payload\n", | |
90 | __func__); | |
91 | kunmap(rqst->rq_pages[i]); | |
92 | return rc; | |
93 | } | |
fb308a6f | 94 | |
fb308a6f JL |
95 | kunmap(rqst->rq_pages[i]); |
96 | } | |
97 | ||
16c568ef | 98 | rc = crypto_shash_final(shash, signature); |
14cae324 | 99 | if (rc) |
16c568ef | 100 | cifs_dbg(VFS, "%s: Could not generate hash\n", __func__); |
84afc29b | 101 | |
307fbd31 | 102 | return rc; |
84afc29b SF |
103 | } |
104 | ||
16c568ef AV |
105 | /* |
106 | * Calculate and return the CIFS signature based on the mac key and SMB PDU. | |
107 | * The 16 byte signature must be allocated by the caller. Note we only use the | |
108 | * 1st eight bytes and that the smb header signature field on input contains | |
109 | * the sequence number before this function is called. Also, this function | |
110 | * should be called with the server->srv_mutex held. | |
111 | */ | |
112 | static int cifs_calc_signature(struct smb_rqst *rqst, | |
113 | struct TCP_Server_Info *server, char *signature) | |
114 | { | |
115 | int rc; | |
116 | ||
117 | if (!rqst->rq_iov || !signature || !server) | |
118 | return -EINVAL; | |
119 | ||
82fb82be AA |
120 | rc = cifs_alloc_hash("md5", &server->secmech.md5, |
121 | &server->secmech.sdescmd5); | |
122 | if (rc) | |
123 | return -1; | |
16c568ef AV |
124 | |
125 | rc = crypto_shash_init(&server->secmech.sdescmd5->shash); | |
126 | if (rc) { | |
127 | cifs_dbg(VFS, "%s: Could not init md5\n", __func__); | |
128 | return rc; | |
129 | } | |
130 | ||
131 | rc = crypto_shash_update(&server->secmech.sdescmd5->shash, | |
132 | server->session_key.response, server->session_key.len); | |
133 | if (rc) { | |
134 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); | |
135 | return rc; | |
136 | } | |
137 | ||
c713c877 | 138 | return __cifs_calc_signature(rqst, server, signature, |
16c568ef AV |
139 | &server->secmech.sdescmd5->shash); |
140 | } | |
141 | ||
a0f8b4fb | 142 | /* must be called with server->srv_mutex held */ |
bf5ea0e2 | 143 | int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server, |
63d2583f | 144 | __u32 *pexpected_response_sequence_number) |
84afc29b SF |
145 | { |
146 | int rc = 0; | |
147 | char smb_signature[20]; | |
bf5ea0e2 | 148 | struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
84afc29b | 149 | |
738f9de5 PS |
150 | if (rqst->rq_iov[0].iov_len != 4 || |
151 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
152 | return -EIO; | |
153 | ||
ffdd6e4d | 154 | if ((cifs_pdu == NULL) || (server == NULL)) |
84afc29b SF |
155 | return -EINVAL; |
156 | ||
998d6fcb JL |
157 | if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) || |
158 | server->tcpStatus == CifsNeedNegotiate) | |
84afc29b SF |
159 | return rc; |
160 | ||
998d6fcb | 161 | if (!server->session_estab) { |
b4dacbc2 | 162 | memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8); |
998d6fcb JL |
163 | return rc; |
164 | } | |
165 | ||
ffdd6e4d | 166 | cifs_pdu->Signature.Sequence.SequenceNumber = |
84afc29b | 167 | cpu_to_le32(server->sequence_number); |
ffdd6e4d | 168 | cifs_pdu->Signature.Sequence.Reserved = 0; |
84afc29b | 169 | |
0124cc45 JL |
170 | *pexpected_response_sequence_number = ++server->sequence_number; |
171 | ++server->sequence_number; | |
84afc29b | 172 | |
bf5ea0e2 | 173 | rc = cifs_calc_signature(rqst, server, smb_signature); |
ffdd6e4d SF |
174 | if (rc) |
175 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |
176 | else | |
177 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
84afc29b | 178 | |
ffdd6e4d | 179 | return rc; |
84afc29b SF |
180 | } |
181 | ||
bf5ea0e2 JL |
182 | int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server, |
183 | __u32 *pexpected_response_sequence) | |
184 | { | |
185 | struct smb_rqst rqst = { .rq_iov = iov, | |
186 | .rq_nvec = n_vec }; | |
187 | ||
188 | return cifs_sign_rqst(&rqst, server, pexpected_response_sequence); | |
189 | } | |
190 | ||
826a95e4 JL |
191 | /* must be called with server->srv_mutex held */ |
192 | int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server, | |
193 | __u32 *pexpected_response_sequence_number) | |
194 | { | |
738f9de5 | 195 | struct kvec iov[2]; |
826a95e4 | 196 | |
738f9de5 PS |
197 | iov[0].iov_base = cifs_pdu; |
198 | iov[0].iov_len = 4; | |
199 | iov[1].iov_base = (char *)cifs_pdu + 4; | |
200 | iov[1].iov_len = be32_to_cpu(cifs_pdu->smb_buf_length); | |
826a95e4 | 201 | |
738f9de5 | 202 | return cifs_sign_smbv(iov, 2, server, |
826a95e4 JL |
203 | pexpected_response_sequence_number); |
204 | } | |
205 | ||
bf5ea0e2 | 206 | int cifs_verify_signature(struct smb_rqst *rqst, |
21e73393 | 207 | struct TCP_Server_Info *server, |
ffdd6e4d | 208 | __u32 expected_sequence_number) |
1da177e4 | 209 | { |
c8e56f1f | 210 | unsigned int rc; |
1da177e4 LT |
211 | char server_response_sig[8]; |
212 | char what_we_think_sig_should_be[20]; | |
bf5ea0e2 | 213 | struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
1da177e4 | 214 | |
738f9de5 PS |
215 | if (rqst->rq_iov[0].iov_len != 4 || |
216 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
217 | return -EIO; | |
218 | ||
21e73393 | 219 | if (cifs_pdu == NULL || server == NULL) |
1da177e4 LT |
220 | return -EINVAL; |
221 | ||
9c4843ea | 222 | if (!server->session_estab) |
1da177e4 LT |
223 | return 0; |
224 | ||
225 | if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) { | |
50c2f753 | 226 | struct smb_com_lock_req *pSMB = |
ffdd6e4d | 227 | (struct smb_com_lock_req *)cifs_pdu; |
5890255b | 228 | if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) |
1da177e4 LT |
229 | return 0; |
230 | } | |
231 | ||
50c2f753 SF |
232 | /* BB what if signatures are supposed to be on for session but |
233 | server does not send one? BB */ | |
234 | ||
1da177e4 | 235 | /* Do not need to verify session setups with signature "BSRSPYL " */ |
50c2f753 | 236 | if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0) |
f96637be JP |
237 | cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n", |
238 | cifs_pdu->Command); | |
1da177e4 LT |
239 | |
240 | /* save off the origiginal signature so we can modify the smb and check | |
241 | its signature against what the server sent */ | |
50c2f753 | 242 | memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8); |
1da177e4 | 243 | |
50c2f753 SF |
244 | cifs_pdu->Signature.Sequence.SequenceNumber = |
245 | cpu_to_le32(expected_sequence_number); | |
1da177e4 LT |
246 | cifs_pdu->Signature.Sequence.Reserved = 0; |
247 | ||
157c2491 | 248 | mutex_lock(&server->srv_mutex); |
bf5ea0e2 | 249 | rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be); |
157c2491 | 250 | mutex_unlock(&server->srv_mutex); |
1da177e4 | 251 | |
50c2f753 | 252 | if (rc) |
1da177e4 LT |
253 | return rc; |
254 | ||
50c2f753 SF |
255 | /* cifs_dump_mem("what we think it should be: ", |
256 | what_we_think_sig_should_be, 16); */ | |
1da177e4 | 257 | |
50c2f753 | 258 | if (memcmp(server_response_sig, what_we_think_sig_should_be, 8)) |
1da177e4 LT |
259 | return -EACCES; |
260 | else | |
261 | return 0; | |
262 | ||
263 | } | |
264 | ||
21e73393 | 265 | /* first calculate 24 bytes ntlm response and then 16 byte session key */ |
9ef5992e | 266 | int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp) |
1da177e4 | 267 | { |
ee2c9258 | 268 | int rc = 0; |
21e73393 SP |
269 | unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE; |
270 | char temp_key[CIFS_SESS_KEY_SIZE]; | |
271 | ||
272 | if (!ses) | |
1da177e4 LT |
273 | return -EINVAL; |
274 | ||
21e73393 | 275 | ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL); |
f96637be | 276 | if (!ses->auth_key.response) |
21e73393 | 277 | return -ENOMEM; |
f96637be | 278 | |
21e73393 SP |
279 | ses->auth_key.len = temp_len; |
280 | ||
ee2c9258 | 281 | rc = SMBNTencrypt(ses->password, ses->server->cryptkey, |
9ef5992e | 282 | ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp); |
ee2c9258 | 283 | if (rc) { |
f96637be JP |
284 | cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n", |
285 | __func__, rc); | |
ee2c9258 SP |
286 | return rc; |
287 | } | |
288 | ||
9ef5992e | 289 | rc = E_md4hash(ses->password, temp_key, nls_cp); |
ee2c9258 | 290 | if (rc) { |
f96637be JP |
291 | cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n", |
292 | __func__, rc); | |
ee2c9258 SP |
293 | return rc; |
294 | } | |
21e73393 | 295 | |
ee2c9258 SP |
296 | rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE); |
297 | if (rc) | |
f96637be JP |
298 | cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n", |
299 | __func__, rc); | |
21e73393 | 300 | |
ee2c9258 | 301 | return rc; |
1da177e4 LT |
302 | } |
303 | ||
7c7b25bc | 304 | #ifdef CONFIG_CIFS_WEAK_PW_HASH |
43988d76 | 305 | int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt, |
4e53a3fb | 306 | char *lnm_session_key) |
7c7b25bc | 307 | { |
52baa51d | 308 | int i, len; |
43988d76 | 309 | int rc; |
97f4b727 | 310 | char password_with_pad[CIFS_ENCPWD_SIZE] = {0}; |
7c7b25bc | 311 | |
52baa51d RS |
312 | if (password) { |
313 | for (len = 0; len < CIFS_ENCPWD_SIZE; len++) | |
314 | if (!password[len]) | |
315 | break; | |
316 | ||
317 | memcpy(password_with_pad, password, len); | |
318 | } | |
4e53a3fb | 319 | |
04912d6a | 320 | if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) { |
4e53a3fb JL |
321 | memcpy(lnm_session_key, password_with_pad, |
322 | CIFS_ENCPWD_SIZE); | |
43988d76 | 323 | return 0; |
4e53a3fb | 324 | } |
bdc4bf6e | 325 | |
7c7b25bc SF |
326 | /* calculate old style session key */ |
327 | /* calling toupper is less broken than repeatedly | |
328 | calling nls_toupper would be since that will never | |
329 | work for UTF8, but neither handles multibyte code pages | |
330 | but the only alternative would be converting to UCS-16 (Unicode) | |
331 | (using a routine something like UniStrupr) then | |
332 | uppercasing and then converting back from Unicode - which | |
333 | would only worth doing it if we knew it were utf8. Basically | |
334 | utf8 and other multibyte codepages each need their own strupper | |
335 | function since a byte at a time will ont work. */ | |
336 | ||
ef571cad | 337 | for (i = 0; i < CIFS_ENCPWD_SIZE; i++) |
7c7b25bc | 338 | password_with_pad[i] = toupper(password_with_pad[i]); |
7c7b25bc | 339 | |
43988d76 | 340 | rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key); |
4e53a3fb | 341 | |
43988d76 | 342 | return rc; |
7c7b25bc SF |
343 | } |
344 | #endif /* CIFS_WEAK_PW_HASH */ | |
345 | ||
9daa42e2 SP |
346 | /* Build a proper attribute value/target info pairs blob. |
347 | * Fill in netbios and dns domain name and workstation name | |
348 | * and client time (total five av pairs and + one end of fields indicator. | |
349 | * Allocate domain name which gets freed when session struct is deallocated. | |
2b149f11 SP |
350 | */ |
351 | static int | |
96daf2b0 | 352 | build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 | 353 | { |
9daa42e2 | 354 | unsigned int dlen; |
cfbd6f84 | 355 | unsigned int size = 2 * sizeof(struct ntlmssp2_name); |
9daa42e2 SP |
356 | char *defdmname = "WORKGROUP"; |
357 | unsigned char *blobptr; | |
2b149f11 SP |
358 | struct ntlmssp2_name *attrptr; |
359 | ||
9daa42e2 SP |
360 | if (!ses->domainName) { |
361 | ses->domainName = kstrdup(defdmname, GFP_KERNEL); | |
362 | if (!ses->domainName) | |
363 | return -ENOMEM; | |
364 | } | |
365 | ||
366 | dlen = strlen(ses->domainName); | |
9daa42e2 | 367 | |
cfbd6f84 SP |
368 | /* |
369 | * The length of this blob is two times the size of a | |
370 | * structure (av pair) which holds name/size | |
371 | * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) + | |
372 | * unicode length of a netbios domain name | |
9daa42e2 | 373 | */ |
cfbd6f84 | 374 | ses->auth_key.len = size + 2 * dlen; |
d3686d54 SP |
375 | ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL); |
376 | if (!ses->auth_key.response) { | |
377 | ses->auth_key.len = 0; | |
2b149f11 SP |
378 | return -ENOMEM; |
379 | } | |
9daa42e2 | 380 | |
d3686d54 | 381 | blobptr = ses->auth_key.response; |
9daa42e2 SP |
382 | attrptr = (struct ntlmssp2_name *) blobptr; |
383 | ||
cfbd6f84 SP |
384 | /* |
385 | * As defined in MS-NTLM 3.3.2, just this av pair field | |
386 | * is sufficient as part of the temp | |
387 | */ | |
9daa42e2 SP |
388 | attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME); |
389 | attrptr->length = cpu_to_le16(2 * dlen); | |
390 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
acbbb76a | 391 | cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp); |
9daa42e2 | 392 | |
2b149f11 SP |
393 | return 0; |
394 | } | |
395 | ||
396 | /* Server has provided av pairs/target info in the type 2 challenge | |
397 | * packet and we have plucked it and stored within smb session. | |
398 | * We parse that blob here to find netbios domain name to be used | |
399 | * as part of ntlmv2 authentication (in Target String), if not already | |
400 | * specified on the command line. | |
401 | * If this function returns without any error but without fetching | |
402 | * domain name, authentication may fail against some server but | |
403 | * may not fail against other (those who are not very particular | |
404 | * about target string i.e. for some, just user name might suffice. | |
405 | */ | |
406 | static int | |
96daf2b0 | 407 | find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 SP |
408 | { |
409 | unsigned int attrsize; | |
410 | unsigned int type; | |
411 | unsigned int onesize = sizeof(struct ntlmssp2_name); | |
412 | unsigned char *blobptr; | |
413 | unsigned char *blobend; | |
414 | struct ntlmssp2_name *attrptr; | |
415 | ||
d3686d54 | 416 | if (!ses->auth_key.len || !ses->auth_key.response) |
2b149f11 SP |
417 | return 0; |
418 | ||
d3686d54 SP |
419 | blobptr = ses->auth_key.response; |
420 | blobend = blobptr + ses->auth_key.len; | |
2b149f11 SP |
421 | |
422 | while (blobptr + onesize < blobend) { | |
423 | attrptr = (struct ntlmssp2_name *) blobptr; | |
424 | type = le16_to_cpu(attrptr->type); | |
425 | if (type == NTLMSSP_AV_EOL) | |
426 | break; | |
427 | blobptr += 2; /* advance attr type */ | |
428 | attrsize = le16_to_cpu(attrptr->length); | |
429 | blobptr += 2; /* advance attr size */ | |
430 | if (blobptr + attrsize > blobend) | |
431 | break; | |
432 | if (type == NTLMSSP_AV_NB_DOMAIN_NAME) { | |
057d6332 | 433 | if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN) |
2b149f11 SP |
434 | break; |
435 | if (!ses->domainName) { | |
436 | ses->domainName = | |
437 | kmalloc(attrsize + 1, GFP_KERNEL); | |
438 | if (!ses->domainName) | |
439 | return -ENOMEM; | |
acbbb76a | 440 | cifs_from_utf16(ses->domainName, |
2b149f11 | 441 | (__le16 *)blobptr, attrsize, attrsize, |
b693855f | 442 | nls_cp, NO_MAP_UNI_RSVD); |
2b149f11 SP |
443 | break; |
444 | } | |
445 | } | |
446 | blobptr += attrsize; /* advance attr value */ | |
447 | } | |
448 | ||
449 | return 0; | |
450 | } | |
451 | ||
98ce94c8 PS |
452 | /* Server has provided av pairs/target info in the type 2 challenge |
453 | * packet and we have plucked it and stored within smb session. | |
454 | * We parse that blob here to find the server given timestamp | |
455 | * as part of ntlmv2 authentication (or local current time as | |
456 | * default in case of failure) | |
457 | */ | |
458 | static __le64 | |
459 | find_timestamp(struct cifs_ses *ses) | |
460 | { | |
461 | unsigned int attrsize; | |
462 | unsigned int type; | |
463 | unsigned int onesize = sizeof(struct ntlmssp2_name); | |
464 | unsigned char *blobptr; | |
465 | unsigned char *blobend; | |
466 | struct ntlmssp2_name *attrptr; | |
95390201 | 467 | struct timespec64 ts; |
98ce94c8 PS |
468 | |
469 | if (!ses->auth_key.len || !ses->auth_key.response) | |
470 | return 0; | |
471 | ||
472 | blobptr = ses->auth_key.response; | |
473 | blobend = blobptr + ses->auth_key.len; | |
474 | ||
475 | while (blobptr + onesize < blobend) { | |
476 | attrptr = (struct ntlmssp2_name *) blobptr; | |
477 | type = le16_to_cpu(attrptr->type); | |
478 | if (type == NTLMSSP_AV_EOL) | |
479 | break; | |
480 | blobptr += 2; /* advance attr type */ | |
481 | attrsize = le16_to_cpu(attrptr->length); | |
482 | blobptr += 2; /* advance attr size */ | |
483 | if (blobptr + attrsize > blobend) | |
484 | break; | |
485 | if (type == NTLMSSP_AV_TIMESTAMP) { | |
486 | if (attrsize == sizeof(u64)) | |
487 | return *((__le64 *)blobptr); | |
488 | } | |
489 | blobptr += attrsize; /* advance attr value */ | |
490 | } | |
491 | ||
95390201 | 492 | ktime_get_real_ts64(&ts); |
e37fea58 | 493 | return cpu_to_le64(cifs_UnixTimeToNT(ts)); |
98ce94c8 PS |
494 | } |
495 | ||
96daf2b0 | 496 | static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash, |
50c2f753 | 497 | const struct nls_table *nls_cp) |
a8ee0344 SF |
498 | { |
499 | int rc = 0; | |
500 | int len; | |
307fbd31 | 501 | char nt_hash[CIFS_NTHASH_SIZE]; |
fdf96a90 | 502 | __le16 *user; |
50c2f753 | 503 | wchar_t *domain; |
307fbd31 | 504 | wchar_t *server; |
a8ee0344 | 505 | |
307fbd31 | 506 | if (!ses->server->secmech.sdeschmacmd5) { |
f96637be | 507 | cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); |
307fbd31 SP |
508 | return -1; |
509 | } | |
56234e27 | 510 | |
c8e56f1f | 511 | /* calculate md4 hash of password */ |
9ef5992e | 512 | E_md4hash(ses->password, nt_hash, nls_cp); |
9fbc5908 | 513 | |
14cae324 | 514 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash, |
307fbd31 | 515 | CIFS_NTHASH_SIZE); |
14cae324 | 516 | if (rc) { |
f96637be | 517 | cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__); |
14cae324 SP |
518 | return rc; |
519 | } | |
307fbd31 SP |
520 | |
521 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
522 | if (rc) { | |
f96637be | 523 | cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__); |
307fbd31 SP |
524 | return rc; |
525 | } | |
a8ee0344 | 526 | |
fdf96a90 | 527 | /* convert ses->user_name to unicode */ |
04febabc | 528 | len = ses->user_name ? strlen(ses->user_name) : 0; |
1717ffc5 | 529 | user = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 530 | if (user == NULL) { |
307fbd31 | 531 | rc = -ENOMEM; |
14cae324 | 532 | return rc; |
307fbd31 | 533 | } |
04febabc JL |
534 | |
535 | if (len) { | |
fdf96a90 | 536 | len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp); |
04febabc JL |
537 | UniStrupr(user); |
538 | } else { | |
539 | memset(user, '\0', 2); | |
540 | } | |
307fbd31 | 541 | |
14cae324 | 542 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 | 543 | (char *)user, 2 * len); |
14cae324 SP |
544 | kfree(user); |
545 | if (rc) { | |
f96637be | 546 | cifs_dbg(VFS, "%s: Could not update with user\n", __func__); |
14cae324 SP |
547 | return rc; |
548 | } | |
a8ee0344 SF |
549 | |
550 | /* convert ses->domainName to unicode and uppercase */ | |
50c2f753 | 551 | if (ses->domainName) { |
1717ffc5 | 552 | len = strlen(ses->domainName); |
a8ee0344 | 553 | |
50c2f753 | 554 | domain = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 555 | if (domain == NULL) { |
307fbd31 | 556 | rc = -ENOMEM; |
14cae324 | 557 | return rc; |
307fbd31 | 558 | } |
acbbb76a SF |
559 | len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len, |
560 | nls_cp); | |
14cae324 | 561 | rc = |
307fbd31 SP |
562 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
563 | (char *)domain, 2 * len); | |
1717ffc5 | 564 | kfree(domain); |
14cae324 | 565 | if (rc) { |
f96637be JP |
566 | cifs_dbg(VFS, "%s: Could not update with domain\n", |
567 | __func__); | |
14cae324 SP |
568 | return rc; |
569 | } | |
8b7a4544 SF |
570 | } else { |
571 | /* We use ses->serverName if no domain name available */ | |
307fbd31 SP |
572 | len = strlen(ses->serverName); |
573 | ||
574 | server = kmalloc(2 + (len * 2), GFP_KERNEL); | |
575 | if (server == NULL) { | |
307fbd31 | 576 | rc = -ENOMEM; |
14cae324 | 577 | return rc; |
307fbd31 | 578 | } |
acbbb76a | 579 | len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len, |
307fbd31 | 580 | nls_cp); |
14cae324 | 581 | rc = |
307fbd31 SP |
582 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
583 | (char *)server, 2 * len); | |
584 | kfree(server); | |
14cae324 | 585 | if (rc) { |
f96637be JP |
586 | cifs_dbg(VFS, "%s: Could not update with server\n", |
587 | __func__); | |
14cae324 SP |
588 | return rc; |
589 | } | |
1717ffc5 | 590 | } |
307fbd31 SP |
591 | |
592 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
d3686d54 | 593 | ntlmv2_hash); |
14cae324 | 594 | if (rc) |
f96637be | 595 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
307fbd31 | 596 | |
307fbd31 SP |
597 | return rc; |
598 | } | |
599 | ||
600 | static int | |
96daf2b0 | 601 | CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash) |
307fbd31 SP |
602 | { |
603 | int rc; | |
2c957ddf TG |
604 | struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *) |
605 | (ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
606 | unsigned int hash_len; | |
607 | ||
608 | /* The MD5 hash starts at challenge_key.key */ | |
609 | hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE + | |
610 | offsetof(struct ntlmv2_resp, challenge.key[0])); | |
307fbd31 SP |
611 | |
612 | if (!ses->server->secmech.sdeschmacmd5) { | |
f96637be | 613 | cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); |
307fbd31 SP |
614 | return -1; |
615 | } | |
616 | ||
14cae324 | 617 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
2c957ddf | 618 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 619 | if (rc) { |
f96637be JP |
620 | cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", |
621 | __func__); | |
14cae324 SP |
622 | return rc; |
623 | } | |
307fbd31 SP |
624 | |
625 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
626 | if (rc) { | |
f96637be | 627 | cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__); |
307fbd31 SP |
628 | return rc; |
629 | } | |
630 | ||
3f618223 | 631 | if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) |
2c957ddf TG |
632 | memcpy(ntlmv2->challenge.key, |
633 | ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); | |
d3ba50b1 | 634 | else |
2c957ddf TG |
635 | memcpy(ntlmv2->challenge.key, |
636 | ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); | |
14cae324 | 637 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
2c957ddf | 638 | ntlmv2->challenge.key, hash_len); |
14cae324 | 639 | if (rc) { |
f96637be | 640 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
14cae324 SP |
641 | return rc; |
642 | } | |
307fbd31 | 643 | |
2c957ddf | 644 | /* Note that the MD5 digest over writes anon.challenge_key.key */ |
307fbd31 | 645 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, |
2c957ddf | 646 | ntlmv2->ntlmv2_hash); |
14cae324 | 647 | if (rc) |
f96637be | 648 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
9fbc5908 SF |
649 | |
650 | return rc; | |
651 | } | |
652 | ||
2b149f11 | 653 | int |
96daf2b0 | 654 | setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp) |
9fbc5908 | 655 | { |
c8e56f1f | 656 | int rc; |
21e73393 | 657 | int baselen; |
d3686d54 | 658 | unsigned int tilen; |
2c957ddf | 659 | struct ntlmv2_resp *ntlmv2; |
d3686d54 SP |
660 | char ntlmv2_hash[16]; |
661 | unsigned char *tiblob = NULL; /* target info blob */ | |
98ce94c8 | 662 | __le64 rsp_timestamp; |
6d027cfd | 663 | |
3f618223 | 664 | if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) { |
2b149f11 | 665 | if (!ses->domainName) { |
39566443 GP |
666 | if (ses->domainAuto) { |
667 | rc = find_domain_name(ses, nls_cp); | |
668 | if (rc) { | |
669 | cifs_dbg(VFS, "error %d finding domain name\n", | |
670 | rc); | |
671 | goto setup_ntlmv2_rsp_ret; | |
672 | } | |
673 | } else { | |
674 | ses->domainName = kstrdup("", GFP_KERNEL); | |
2b149f11 SP |
675 | } |
676 | } | |
677 | } else { | |
9daa42e2 | 678 | rc = build_avpair_blob(ses, nls_cp); |
2b149f11 | 679 | if (rc) { |
f96637be | 680 | cifs_dbg(VFS, "error %d building av pair blob\n", rc); |
d3686d54 | 681 | goto setup_ntlmv2_rsp_ret; |
2b149f11 SP |
682 | } |
683 | } | |
a8ee0344 | 684 | |
98ce94c8 PS |
685 | /* Must be within 5 minutes of the server (or in range +/-2h |
686 | * in case of Mac OS X), so simply carry over server timestamp | |
687 | * (as Windows 7 does) | |
688 | */ | |
689 | rsp_timestamp = find_timestamp(ses); | |
690 | ||
21e73393 | 691 | baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp); |
d3686d54 SP |
692 | tilen = ses->auth_key.len; |
693 | tiblob = ses->auth_key.response; | |
694 | ||
695 | ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL); | |
21e73393 | 696 | if (!ses->auth_key.response) { |
4b550af5 | 697 | rc = -ENOMEM; |
d3686d54 | 698 | ses->auth_key.len = 0; |
21e73393 SP |
699 | goto setup_ntlmv2_rsp_ret; |
700 | } | |
d3686d54 | 701 | ses->auth_key.len += baselen; |
21e73393 | 702 | |
2c957ddf | 703 | ntlmv2 = (struct ntlmv2_resp *) |
21e73393 | 704 | (ses->auth_key.response + CIFS_SESS_KEY_SIZE); |
2c957ddf TG |
705 | ntlmv2->blob_signature = cpu_to_le32(0x00000101); |
706 | ntlmv2->reserved = 0; | |
98ce94c8 PS |
707 | ntlmv2->time = rsp_timestamp; |
708 | ||
2c957ddf TG |
709 | get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal)); |
710 | ntlmv2->reserved2 = 0; | |
21e73393 | 711 | |
d3686d54 | 712 | memcpy(ses->auth_key.response + baselen, tiblob, tilen); |
21e73393 | 713 | |
bd975d1e RV |
714 | mutex_lock(&ses->server->srv_mutex); |
715 | ||
82fb82be AA |
716 | rc = cifs_alloc_hash("hmac(md5)", |
717 | &ses->server->secmech.hmacmd5, | |
718 | &ses->server->secmech.sdeschmacmd5); | |
95dc8dd1 | 719 | if (rc) { |
bd975d1e | 720 | goto unlock; |
95dc8dd1 SF |
721 | } |
722 | ||
f7c5445a | 723 | /* calculate ntlmv2_hash */ |
d3686d54 | 724 | rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp); |
2b149f11 | 725 | if (rc) { |
f96637be | 726 | cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc); |
bd975d1e | 727 | goto unlock; |
2b149f11 | 728 | } |
f7c5445a SP |
729 | |
730 | /* calculate first part of the client response (CR1) */ | |
d3686d54 | 731 | rc = CalcNTLMv2_response(ses, ntlmv2_hash); |
307fbd31 | 732 | if (rc) { |
f96637be | 733 | cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc); |
bd975d1e | 734 | goto unlock; |
307fbd31 | 735 | } |
b609f06a | 736 | |
5d0d2882 | 737 | /* now calculate the session key for NTLMv2 */ |
14cae324 | 738 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
d3686d54 | 739 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 740 | if (rc) { |
f96637be JP |
741 | cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", |
742 | __func__); | |
bd975d1e | 743 | goto unlock; |
14cae324 | 744 | } |
307fbd31 SP |
745 | |
746 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
747 | if (rc) { | |
f96637be | 748 | cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__); |
bd975d1e | 749 | goto unlock; |
307fbd31 SP |
750 | } |
751 | ||
14cae324 | 752 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
2c957ddf | 753 | ntlmv2->ntlmv2_hash, |
307fbd31 | 754 | CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 755 | if (rc) { |
f96637be | 756 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
bd975d1e | 757 | goto unlock; |
14cae324 | 758 | } |
307fbd31 SP |
759 | |
760 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
761 | ses->auth_key.response); | |
14cae324 | 762 | if (rc) |
f96637be | 763 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
2b149f11 | 764 | |
bd975d1e RV |
765 | unlock: |
766 | mutex_unlock(&ses->server->srv_mutex); | |
2b149f11 | 767 | setup_ntlmv2_rsp_ret: |
d3686d54 | 768 | kfree(tiblob); |
2b149f11 SP |
769 | |
770 | return rc; | |
6d027cfd SF |
771 | } |
772 | ||
d2b91521 | 773 | int |
96daf2b0 | 774 | calc_seckey(struct cifs_ses *ses) |
d2b91521 | 775 | { |
97a5fee2 AB |
776 | unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */ |
777 | struct arc4_ctx *ctx_arc4; | |
5f4b5569 | 778 | |
97a5fee2 AB |
779 | if (fips_enabled) |
780 | return -ENODEV; | |
d2b91521 SP |
781 | |
782 | get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE); | |
783 | ||
97a5fee2 AB |
784 | ctx_arc4 = kmalloc(sizeof(*ctx_arc4), GFP_KERNEL); |
785 | if (!ctx_arc4) { | |
786 | cifs_dbg(VFS, "could not allocate arc4 context\n"); | |
787 | return -ENOMEM; | |
14cae324 | 788 | } |
d2b91521 | 789 | |
97a5fee2 AB |
790 | arc4_setkey(ctx_arc4, ses->auth_key.response, CIFS_SESS_KEY_SIZE); |
791 | arc4_crypt(ctx_arc4, ses->ntlmssp->ciphertext, sec_key, | |
792 | CIFS_CPHTXT_SIZE); | |
d2b91521 SP |
793 | |
794 | /* make secondary_key/nonce as session key */ | |
795 | memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE); | |
796 | /* and make len as that of session key only */ | |
797 | ses->auth_key.len = CIFS_SESS_KEY_SIZE; | |
798 | ||
97a5fee2 AB |
799 | memzero_explicit(sec_key, CIFS_SESS_KEY_SIZE); |
800 | kzfree(ctx_arc4); | |
801 | return 0; | |
d2b91521 SP |
802 | } |
803 | ||
804 | void | |
026e93dc | 805 | cifs_crypto_secmech_release(struct TCP_Server_Info *server) |
d2b91521 | 806 | { |
95dc8dd1 | 807 | if (server->secmech.cmacaes) { |
429b46f4 | 808 | crypto_free_shash(server->secmech.cmacaes); |
95dc8dd1 SF |
809 | server->secmech.cmacaes = NULL; |
810 | } | |
429b46f4 | 811 | |
95dc8dd1 | 812 | if (server->secmech.hmacsha256) { |
3c1bf7e4 | 813 | crypto_free_shash(server->secmech.hmacsha256); |
95dc8dd1 SF |
814 | server->secmech.hmacsha256 = NULL; |
815 | } | |
3c1bf7e4 | 816 | |
95dc8dd1 | 817 | if (server->secmech.md5) { |
d2b91521 | 818 | crypto_free_shash(server->secmech.md5); |
95dc8dd1 SF |
819 | server->secmech.md5 = NULL; |
820 | } | |
d2b91521 | 821 | |
70e80655 | 822 | if (server->secmech.sha512) { |
5fcd7f3f AA |
823 | crypto_free_shash(server->secmech.sha512); |
824 | server->secmech.sha512 = NULL; | |
825 | } | |
826 | ||
95dc8dd1 | 827 | if (server->secmech.hmacmd5) { |
d2b91521 | 828 | crypto_free_shash(server->secmech.hmacmd5); |
95dc8dd1 SF |
829 | server->secmech.hmacmd5 = NULL; |
830 | } | |
d2b91521 | 831 | |
026e93dc PS |
832 | if (server->secmech.ccmaesencrypt) { |
833 | crypto_free_aead(server->secmech.ccmaesencrypt); | |
834 | server->secmech.ccmaesencrypt = NULL; | |
835 | } | |
836 | ||
837 | if (server->secmech.ccmaesdecrypt) { | |
838 | crypto_free_aead(server->secmech.ccmaesdecrypt); | |
839 | server->secmech.ccmaesdecrypt = NULL; | |
840 | } | |
841 | ||
429b46f4 | 842 | kfree(server->secmech.sdesccmacaes); |
95dc8dd1 | 843 | server->secmech.sdesccmacaes = NULL; |
3c1bf7e4 | 844 | kfree(server->secmech.sdeschmacsha256); |
95dc8dd1 | 845 | server->secmech.sdeschmacsha256 = NULL; |
d2b91521 | 846 | kfree(server->secmech.sdeschmacmd5); |
95dc8dd1 | 847 | server->secmech.sdeschmacmd5 = NULL; |
d2b91521 | 848 | kfree(server->secmech.sdescmd5); |
95dc8dd1 | 849 | server->secmech.sdescmd5 = NULL; |
5fcd7f3f AA |
850 | kfree(server->secmech.sdescsha512); |
851 | server->secmech.sdescsha512 = NULL; | |
d2b91521 | 852 | } |