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Commit | Line | Data |
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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> |
9651ddba | 36 | #include <crypto/skcipher.h> |
026e93dc | 37 | #include <crypto/aead.h> |
1da177e4 | 38 | |
16c568ef | 39 | int __cifs_calc_signature(struct smb_rqst *rqst, |
57f933ce | 40 | int start, |
16c568ef AV |
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; | |
84afc29b | 48 | |
57f933ce | 49 | for (i = start; i < n_vec; i++) { |
745542e2 JL |
50 | if (iov[i].iov_len == 0) |
51 | continue; | |
ffdd6e4d | 52 | if (iov[i].iov_base == NULL) { |
f96637be | 53 | cifs_dbg(VFS, "null iovec entry\n"); |
e9917a00 | 54 | return -EIO; |
745542e2 | 55 | } |
738f9de5 PS |
56 | if (i == 1 && iov[1].iov_len <= 4) |
57 | break; /* nothing to sign or corrupt header */ | |
58 | rc = crypto_shash_update(shash, | |
59 | iov[i].iov_base, iov[i].iov_len); | |
14cae324 | 60 | if (rc) { |
f96637be JP |
61 | cifs_dbg(VFS, "%s: Could not update with payload\n", |
62 | __func__); | |
14cae324 SP |
63 | return rc; |
64 | } | |
e9917a00 | 65 | } |
84afc29b | 66 | |
fb308a6f JL |
67 | /* now hash over the rq_pages array */ |
68 | for (i = 0; i < rqst->rq_npages; i++) { | |
4c0d2a5a LL |
69 | void *kaddr; |
70 | unsigned int len, offset; | |
16c568ef | 71 | |
4c0d2a5a LL |
72 | rqst_page_get_length(rqst, i, &len, &offset); |
73 | ||
74 | kaddr = (char *) kmap(rqst->rq_pages[i]) + offset; | |
16c568ef AV |
75 | |
76 | crypto_shash_update(shash, kaddr, len); | |
fb308a6f | 77 | |
fb308a6f JL |
78 | kunmap(rqst->rq_pages[i]); |
79 | } | |
80 | ||
16c568ef | 81 | rc = crypto_shash_final(shash, signature); |
14cae324 | 82 | if (rc) |
16c568ef | 83 | cifs_dbg(VFS, "%s: Could not generate hash\n", __func__); |
84afc29b | 84 | |
307fbd31 | 85 | return rc; |
84afc29b SF |
86 | } |
87 | ||
16c568ef AV |
88 | /* |
89 | * Calculate and return the CIFS signature based on the mac key and SMB PDU. | |
90 | * The 16 byte signature must be allocated by the caller. Note we only use the | |
91 | * 1st eight bytes and that the smb header signature field on input contains | |
92 | * the sequence number before this function is called. Also, this function | |
93 | * should be called with the server->srv_mutex held. | |
94 | */ | |
95 | static int cifs_calc_signature(struct smb_rqst *rqst, | |
96 | struct TCP_Server_Info *server, char *signature) | |
97 | { | |
98 | int rc; | |
99 | ||
100 | if (!rqst->rq_iov || !signature || !server) | |
101 | return -EINVAL; | |
102 | ||
82fb82be AA |
103 | rc = cifs_alloc_hash("md5", &server->secmech.md5, |
104 | &server->secmech.sdescmd5); | |
105 | if (rc) | |
106 | return -1; | |
16c568ef AV |
107 | |
108 | rc = crypto_shash_init(&server->secmech.sdescmd5->shash); | |
109 | if (rc) { | |
110 | cifs_dbg(VFS, "%s: Could not init md5\n", __func__); | |
111 | return rc; | |
112 | } | |
113 | ||
114 | rc = crypto_shash_update(&server->secmech.sdescmd5->shash, | |
115 | server->session_key.response, server->session_key.len); | |
116 | if (rc) { | |
117 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); | |
118 | return rc; | |
119 | } | |
120 | ||
57f933ce | 121 | return __cifs_calc_signature(rqst, 1, server, signature, |
16c568ef AV |
122 | &server->secmech.sdescmd5->shash); |
123 | } | |
124 | ||
a0f8b4fb | 125 | /* must be called with server->srv_mutex held */ |
bf5ea0e2 | 126 | int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server, |
63d2583f | 127 | __u32 *pexpected_response_sequence_number) |
84afc29b SF |
128 | { |
129 | int rc = 0; | |
130 | char smb_signature[20]; | |
bf5ea0e2 | 131 | struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
84afc29b | 132 | |
738f9de5 PS |
133 | if (rqst->rq_iov[0].iov_len != 4 || |
134 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
135 | return -EIO; | |
136 | ||
ffdd6e4d | 137 | if ((cifs_pdu == NULL) || (server == NULL)) |
84afc29b SF |
138 | return -EINVAL; |
139 | ||
998d6fcb JL |
140 | if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) || |
141 | server->tcpStatus == CifsNeedNegotiate) | |
84afc29b SF |
142 | return rc; |
143 | ||
998d6fcb | 144 | if (!server->session_estab) { |
b4dacbc2 | 145 | memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8); |
998d6fcb JL |
146 | return rc; |
147 | } | |
148 | ||
ffdd6e4d | 149 | cifs_pdu->Signature.Sequence.SequenceNumber = |
84afc29b | 150 | cpu_to_le32(server->sequence_number); |
ffdd6e4d | 151 | cifs_pdu->Signature.Sequence.Reserved = 0; |
84afc29b | 152 | |
0124cc45 JL |
153 | *pexpected_response_sequence_number = ++server->sequence_number; |
154 | ++server->sequence_number; | |
84afc29b | 155 | |
bf5ea0e2 | 156 | rc = cifs_calc_signature(rqst, server, smb_signature); |
ffdd6e4d SF |
157 | if (rc) |
158 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |
159 | else | |
160 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
84afc29b | 161 | |
ffdd6e4d | 162 | return rc; |
84afc29b SF |
163 | } |
164 | ||
bf5ea0e2 JL |
165 | int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server, |
166 | __u32 *pexpected_response_sequence) | |
167 | { | |
168 | struct smb_rqst rqst = { .rq_iov = iov, | |
169 | .rq_nvec = n_vec }; | |
170 | ||
171 | return cifs_sign_rqst(&rqst, server, pexpected_response_sequence); | |
172 | } | |
173 | ||
826a95e4 JL |
174 | /* must be called with server->srv_mutex held */ |
175 | int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server, | |
176 | __u32 *pexpected_response_sequence_number) | |
177 | { | |
738f9de5 | 178 | struct kvec iov[2]; |
826a95e4 | 179 | |
738f9de5 PS |
180 | iov[0].iov_base = cifs_pdu; |
181 | iov[0].iov_len = 4; | |
182 | iov[1].iov_base = (char *)cifs_pdu + 4; | |
183 | iov[1].iov_len = be32_to_cpu(cifs_pdu->smb_buf_length); | |
826a95e4 | 184 | |
738f9de5 | 185 | return cifs_sign_smbv(iov, 2, server, |
826a95e4 JL |
186 | pexpected_response_sequence_number); |
187 | } | |
188 | ||
bf5ea0e2 | 189 | int cifs_verify_signature(struct smb_rqst *rqst, |
21e73393 | 190 | struct TCP_Server_Info *server, |
ffdd6e4d | 191 | __u32 expected_sequence_number) |
1da177e4 | 192 | { |
c8e56f1f | 193 | unsigned int rc; |
1da177e4 LT |
194 | char server_response_sig[8]; |
195 | char what_we_think_sig_should_be[20]; | |
bf5ea0e2 | 196 | struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
1da177e4 | 197 | |
738f9de5 PS |
198 | if (rqst->rq_iov[0].iov_len != 4 || |
199 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
200 | return -EIO; | |
201 | ||
21e73393 | 202 | if (cifs_pdu == NULL || server == NULL) |
1da177e4 LT |
203 | return -EINVAL; |
204 | ||
9c4843ea | 205 | if (!server->session_estab) |
1da177e4 LT |
206 | return 0; |
207 | ||
208 | if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) { | |
50c2f753 | 209 | struct smb_com_lock_req *pSMB = |
ffdd6e4d SF |
210 | (struct smb_com_lock_req *)cifs_pdu; |
211 | if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) | |
1da177e4 LT |
212 | return 0; |
213 | } | |
214 | ||
50c2f753 SF |
215 | /* BB what if signatures are supposed to be on for session but |
216 | server does not send one? BB */ | |
217 | ||
1da177e4 | 218 | /* Do not need to verify session setups with signature "BSRSPYL " */ |
50c2f753 | 219 | if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0) |
f96637be JP |
220 | cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n", |
221 | cifs_pdu->Command); | |
1da177e4 LT |
222 | |
223 | /* save off the origiginal signature so we can modify the smb and check | |
224 | its signature against what the server sent */ | |
50c2f753 | 225 | memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8); |
1da177e4 | 226 | |
50c2f753 SF |
227 | cifs_pdu->Signature.Sequence.SequenceNumber = |
228 | cpu_to_le32(expected_sequence_number); | |
1da177e4 LT |
229 | cifs_pdu->Signature.Sequence.Reserved = 0; |
230 | ||
157c2491 | 231 | mutex_lock(&server->srv_mutex); |
bf5ea0e2 | 232 | rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be); |
157c2491 | 233 | mutex_unlock(&server->srv_mutex); |
1da177e4 | 234 | |
50c2f753 | 235 | if (rc) |
1da177e4 LT |
236 | return rc; |
237 | ||
50c2f753 SF |
238 | /* cifs_dump_mem("what we think it should be: ", |
239 | what_we_think_sig_should_be, 16); */ | |
1da177e4 | 240 | |
50c2f753 | 241 | if (memcmp(server_response_sig, what_we_think_sig_should_be, 8)) |
1da177e4 LT |
242 | return -EACCES; |
243 | else | |
244 | return 0; | |
245 | ||
246 | } | |
247 | ||
21e73393 | 248 | /* first calculate 24 bytes ntlm response and then 16 byte session key */ |
9ef5992e | 249 | int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp) |
1da177e4 | 250 | { |
ee2c9258 | 251 | int rc = 0; |
21e73393 SP |
252 | unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE; |
253 | char temp_key[CIFS_SESS_KEY_SIZE]; | |
254 | ||
255 | if (!ses) | |
1da177e4 LT |
256 | return -EINVAL; |
257 | ||
21e73393 | 258 | ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL); |
f96637be | 259 | if (!ses->auth_key.response) |
21e73393 | 260 | return -ENOMEM; |
f96637be | 261 | |
21e73393 SP |
262 | ses->auth_key.len = temp_len; |
263 | ||
ee2c9258 | 264 | rc = SMBNTencrypt(ses->password, ses->server->cryptkey, |
9ef5992e | 265 | ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp); |
ee2c9258 | 266 | if (rc) { |
f96637be JP |
267 | cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n", |
268 | __func__, rc); | |
ee2c9258 SP |
269 | return rc; |
270 | } | |
271 | ||
9ef5992e | 272 | rc = E_md4hash(ses->password, temp_key, nls_cp); |
ee2c9258 | 273 | if (rc) { |
f96637be JP |
274 | cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n", |
275 | __func__, rc); | |
ee2c9258 SP |
276 | return rc; |
277 | } | |
21e73393 | 278 | |
ee2c9258 SP |
279 | rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE); |
280 | if (rc) | |
f96637be JP |
281 | cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n", |
282 | __func__, rc); | |
21e73393 | 283 | |
ee2c9258 | 284 | return rc; |
1da177e4 LT |
285 | } |
286 | ||
7c7b25bc | 287 | #ifdef CONFIG_CIFS_WEAK_PW_HASH |
43988d76 | 288 | int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt, |
4e53a3fb | 289 | char *lnm_session_key) |
7c7b25bc SF |
290 | { |
291 | int i; | |
43988d76 | 292 | int rc; |
97f4b727 | 293 | char password_with_pad[CIFS_ENCPWD_SIZE] = {0}; |
7c7b25bc | 294 | |
4e53a3fb JL |
295 | if (password) |
296 | strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE); | |
297 | ||
04912d6a | 298 | if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) { |
4e53a3fb JL |
299 | memcpy(lnm_session_key, password_with_pad, |
300 | CIFS_ENCPWD_SIZE); | |
43988d76 | 301 | return 0; |
4e53a3fb | 302 | } |
bdc4bf6e | 303 | |
7c7b25bc SF |
304 | /* calculate old style session key */ |
305 | /* calling toupper is less broken than repeatedly | |
306 | calling nls_toupper would be since that will never | |
307 | work for UTF8, but neither handles multibyte code pages | |
308 | but the only alternative would be converting to UCS-16 (Unicode) | |
309 | (using a routine something like UniStrupr) then | |
310 | uppercasing and then converting back from Unicode - which | |
311 | would only worth doing it if we knew it were utf8. Basically | |
312 | utf8 and other multibyte codepages each need their own strupper | |
313 | function since a byte at a time will ont work. */ | |
314 | ||
ef571cad | 315 | for (i = 0; i < CIFS_ENCPWD_SIZE; i++) |
7c7b25bc | 316 | password_with_pad[i] = toupper(password_with_pad[i]); |
7c7b25bc | 317 | |
43988d76 | 318 | rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key); |
4e53a3fb | 319 | |
43988d76 | 320 | return rc; |
7c7b25bc SF |
321 | } |
322 | #endif /* CIFS_WEAK_PW_HASH */ | |
323 | ||
9daa42e2 SP |
324 | /* Build a proper attribute value/target info pairs blob. |
325 | * Fill in netbios and dns domain name and workstation name | |
326 | * and client time (total five av pairs and + one end of fields indicator. | |
327 | * Allocate domain name which gets freed when session struct is deallocated. | |
2b149f11 SP |
328 | */ |
329 | static int | |
96daf2b0 | 330 | build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 | 331 | { |
9daa42e2 | 332 | unsigned int dlen; |
cfbd6f84 | 333 | unsigned int size = 2 * sizeof(struct ntlmssp2_name); |
9daa42e2 SP |
334 | char *defdmname = "WORKGROUP"; |
335 | unsigned char *blobptr; | |
2b149f11 SP |
336 | struct ntlmssp2_name *attrptr; |
337 | ||
9daa42e2 SP |
338 | if (!ses->domainName) { |
339 | ses->domainName = kstrdup(defdmname, GFP_KERNEL); | |
340 | if (!ses->domainName) | |
341 | return -ENOMEM; | |
342 | } | |
343 | ||
344 | dlen = strlen(ses->domainName); | |
9daa42e2 | 345 | |
cfbd6f84 SP |
346 | /* |
347 | * The length of this blob is two times the size of a | |
348 | * structure (av pair) which holds name/size | |
349 | * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) + | |
350 | * unicode length of a netbios domain name | |
9daa42e2 | 351 | */ |
cfbd6f84 | 352 | ses->auth_key.len = size + 2 * dlen; |
d3686d54 SP |
353 | ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL); |
354 | if (!ses->auth_key.response) { | |
355 | ses->auth_key.len = 0; | |
2b149f11 SP |
356 | return -ENOMEM; |
357 | } | |
9daa42e2 | 358 | |
d3686d54 | 359 | blobptr = ses->auth_key.response; |
9daa42e2 SP |
360 | attrptr = (struct ntlmssp2_name *) blobptr; |
361 | ||
cfbd6f84 SP |
362 | /* |
363 | * As defined in MS-NTLM 3.3.2, just this av pair field | |
364 | * is sufficient as part of the temp | |
365 | */ | |
9daa42e2 SP |
366 | attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME); |
367 | attrptr->length = cpu_to_le16(2 * dlen); | |
368 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
acbbb76a | 369 | cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp); |
9daa42e2 | 370 | |
2b149f11 SP |
371 | return 0; |
372 | } | |
373 | ||
374 | /* Server has provided av pairs/target info in the type 2 challenge | |
375 | * packet and we have plucked it and stored within smb session. | |
376 | * We parse that blob here to find netbios domain name to be used | |
377 | * as part of ntlmv2 authentication (in Target String), if not already | |
378 | * specified on the command line. | |
379 | * If this function returns without any error but without fetching | |
380 | * domain name, authentication may fail against some server but | |
381 | * may not fail against other (those who are not very particular | |
382 | * about target string i.e. for some, just user name might suffice. | |
383 | */ | |
384 | static int | |
96daf2b0 | 385 | find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 SP |
386 | { |
387 | unsigned int attrsize; | |
388 | unsigned int type; | |
389 | unsigned int onesize = sizeof(struct ntlmssp2_name); | |
390 | unsigned char *blobptr; | |
391 | unsigned char *blobend; | |
392 | struct ntlmssp2_name *attrptr; | |
393 | ||
d3686d54 | 394 | if (!ses->auth_key.len || !ses->auth_key.response) |
2b149f11 SP |
395 | return 0; |
396 | ||
d3686d54 SP |
397 | blobptr = ses->auth_key.response; |
398 | blobend = blobptr + ses->auth_key.len; | |
2b149f11 SP |
399 | |
400 | while (blobptr + onesize < blobend) { | |
401 | attrptr = (struct ntlmssp2_name *) blobptr; | |
402 | type = le16_to_cpu(attrptr->type); | |
403 | if (type == NTLMSSP_AV_EOL) | |
404 | break; | |
405 | blobptr += 2; /* advance attr type */ | |
406 | attrsize = le16_to_cpu(attrptr->length); | |
407 | blobptr += 2; /* advance attr size */ | |
408 | if (blobptr + attrsize > blobend) | |
409 | break; | |
410 | if (type == NTLMSSP_AV_NB_DOMAIN_NAME) { | |
057d6332 | 411 | if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN) |
2b149f11 SP |
412 | break; |
413 | if (!ses->domainName) { | |
414 | ses->domainName = | |
415 | kmalloc(attrsize + 1, GFP_KERNEL); | |
416 | if (!ses->domainName) | |
417 | return -ENOMEM; | |
acbbb76a | 418 | cifs_from_utf16(ses->domainName, |
2b149f11 | 419 | (__le16 *)blobptr, attrsize, attrsize, |
b693855f | 420 | nls_cp, NO_MAP_UNI_RSVD); |
2b149f11 SP |
421 | break; |
422 | } | |
423 | } | |
424 | blobptr += attrsize; /* advance attr value */ | |
425 | } | |
426 | ||
427 | return 0; | |
428 | } | |
429 | ||
98ce94c8 PS |
430 | /* Server has provided av pairs/target info in the type 2 challenge |
431 | * packet and we have plucked it and stored within smb session. | |
432 | * We parse that blob here to find the server given timestamp | |
433 | * as part of ntlmv2 authentication (or local current time as | |
434 | * default in case of failure) | |
435 | */ | |
436 | static __le64 | |
437 | find_timestamp(struct cifs_ses *ses) | |
438 | { | |
439 | unsigned int attrsize; | |
440 | unsigned int type; | |
441 | unsigned int onesize = sizeof(struct ntlmssp2_name); | |
442 | unsigned char *blobptr; | |
443 | unsigned char *blobend; | |
444 | struct ntlmssp2_name *attrptr; | |
e37fea58 | 445 | struct timespec ts; |
98ce94c8 PS |
446 | |
447 | if (!ses->auth_key.len || !ses->auth_key.response) | |
448 | return 0; | |
449 | ||
450 | blobptr = ses->auth_key.response; | |
451 | blobend = blobptr + ses->auth_key.len; | |
452 | ||
453 | while (blobptr + onesize < blobend) { | |
454 | attrptr = (struct ntlmssp2_name *) blobptr; | |
455 | type = le16_to_cpu(attrptr->type); | |
456 | if (type == NTLMSSP_AV_EOL) | |
457 | break; | |
458 | blobptr += 2; /* advance attr type */ | |
459 | attrsize = le16_to_cpu(attrptr->length); | |
460 | blobptr += 2; /* advance attr size */ | |
461 | if (blobptr + attrsize > blobend) | |
462 | break; | |
463 | if (type == NTLMSSP_AV_TIMESTAMP) { | |
464 | if (attrsize == sizeof(u64)) | |
465 | return *((__le64 *)blobptr); | |
466 | } | |
467 | blobptr += attrsize; /* advance attr value */ | |
468 | } | |
469 | ||
e37fea58 DD |
470 | ktime_get_real_ts(&ts); |
471 | return cpu_to_le64(cifs_UnixTimeToNT(ts)); | |
98ce94c8 PS |
472 | } |
473 | ||
96daf2b0 | 474 | static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash, |
50c2f753 | 475 | const struct nls_table *nls_cp) |
a8ee0344 SF |
476 | { |
477 | int rc = 0; | |
478 | int len; | |
307fbd31 | 479 | char nt_hash[CIFS_NTHASH_SIZE]; |
fdf96a90 | 480 | __le16 *user; |
50c2f753 | 481 | wchar_t *domain; |
307fbd31 | 482 | wchar_t *server; |
a8ee0344 | 483 | |
307fbd31 | 484 | if (!ses->server->secmech.sdeschmacmd5) { |
f96637be | 485 | cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); |
307fbd31 SP |
486 | return -1; |
487 | } | |
56234e27 | 488 | |
c8e56f1f | 489 | /* calculate md4 hash of password */ |
9ef5992e | 490 | E_md4hash(ses->password, nt_hash, nls_cp); |
9fbc5908 | 491 | |
14cae324 | 492 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash, |
307fbd31 | 493 | CIFS_NTHASH_SIZE); |
14cae324 | 494 | if (rc) { |
f96637be | 495 | cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__); |
14cae324 SP |
496 | return rc; |
497 | } | |
307fbd31 SP |
498 | |
499 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
500 | if (rc) { | |
f96637be | 501 | cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__); |
307fbd31 SP |
502 | return rc; |
503 | } | |
a8ee0344 | 504 | |
fdf96a90 | 505 | /* convert ses->user_name to unicode */ |
04febabc | 506 | len = ses->user_name ? strlen(ses->user_name) : 0; |
1717ffc5 | 507 | user = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 508 | if (user == NULL) { |
307fbd31 | 509 | rc = -ENOMEM; |
14cae324 | 510 | return rc; |
307fbd31 | 511 | } |
04febabc JL |
512 | |
513 | if (len) { | |
fdf96a90 | 514 | len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp); |
04febabc JL |
515 | UniStrupr(user); |
516 | } else { | |
517 | memset(user, '\0', 2); | |
518 | } | |
307fbd31 | 519 | |
14cae324 | 520 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 | 521 | (char *)user, 2 * len); |
14cae324 SP |
522 | kfree(user); |
523 | if (rc) { | |
f96637be | 524 | cifs_dbg(VFS, "%s: Could not update with user\n", __func__); |
14cae324 SP |
525 | return rc; |
526 | } | |
a8ee0344 SF |
527 | |
528 | /* convert ses->domainName to unicode and uppercase */ | |
50c2f753 | 529 | if (ses->domainName) { |
1717ffc5 | 530 | len = strlen(ses->domainName); |
a8ee0344 | 531 | |
50c2f753 | 532 | domain = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 533 | if (domain == NULL) { |
307fbd31 | 534 | rc = -ENOMEM; |
14cae324 | 535 | return rc; |
307fbd31 | 536 | } |
acbbb76a SF |
537 | len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len, |
538 | nls_cp); | |
14cae324 | 539 | rc = |
307fbd31 SP |
540 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
541 | (char *)domain, 2 * len); | |
1717ffc5 | 542 | kfree(domain); |
14cae324 | 543 | if (rc) { |
f96637be JP |
544 | cifs_dbg(VFS, "%s: Could not update with domain\n", |
545 | __func__); | |
14cae324 SP |
546 | return rc; |
547 | } | |
8b7a4544 SF |
548 | } else { |
549 | /* We use ses->serverName if no domain name available */ | |
307fbd31 SP |
550 | len = strlen(ses->serverName); |
551 | ||
552 | server = kmalloc(2 + (len * 2), GFP_KERNEL); | |
553 | if (server == NULL) { | |
307fbd31 | 554 | rc = -ENOMEM; |
14cae324 | 555 | return rc; |
307fbd31 | 556 | } |
acbbb76a | 557 | len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len, |
307fbd31 | 558 | nls_cp); |
14cae324 | 559 | rc = |
307fbd31 SP |
560 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
561 | (char *)server, 2 * len); | |
562 | kfree(server); | |
14cae324 | 563 | if (rc) { |
f96637be JP |
564 | cifs_dbg(VFS, "%s: Could not update with server\n", |
565 | __func__); | |
14cae324 SP |
566 | return rc; |
567 | } | |
1717ffc5 | 568 | } |
307fbd31 SP |
569 | |
570 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
d3686d54 | 571 | ntlmv2_hash); |
14cae324 | 572 | if (rc) |
f96637be | 573 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
307fbd31 | 574 | |
307fbd31 SP |
575 | return rc; |
576 | } | |
577 | ||
578 | static int | |
96daf2b0 | 579 | CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash) |
307fbd31 SP |
580 | { |
581 | int rc; | |
2c957ddf TG |
582 | struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *) |
583 | (ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
584 | unsigned int hash_len; | |
585 | ||
586 | /* The MD5 hash starts at challenge_key.key */ | |
587 | hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE + | |
588 | offsetof(struct ntlmv2_resp, challenge.key[0])); | |
307fbd31 SP |
589 | |
590 | if (!ses->server->secmech.sdeschmacmd5) { | |
f96637be | 591 | cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); |
307fbd31 SP |
592 | return -1; |
593 | } | |
594 | ||
14cae324 | 595 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
2c957ddf | 596 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 597 | if (rc) { |
f96637be JP |
598 | cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", |
599 | __func__); | |
14cae324 SP |
600 | return rc; |
601 | } | |
307fbd31 SP |
602 | |
603 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
604 | if (rc) { | |
f96637be | 605 | cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__); |
307fbd31 SP |
606 | return rc; |
607 | } | |
608 | ||
3f618223 | 609 | if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) |
2c957ddf TG |
610 | memcpy(ntlmv2->challenge.key, |
611 | ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); | |
d3ba50b1 | 612 | else |
2c957ddf TG |
613 | memcpy(ntlmv2->challenge.key, |
614 | ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); | |
14cae324 | 615 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
2c957ddf | 616 | ntlmv2->challenge.key, hash_len); |
14cae324 | 617 | if (rc) { |
f96637be | 618 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
14cae324 SP |
619 | return rc; |
620 | } | |
307fbd31 | 621 | |
2c957ddf | 622 | /* Note that the MD5 digest over writes anon.challenge_key.key */ |
307fbd31 | 623 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, |
2c957ddf | 624 | ntlmv2->ntlmv2_hash); |
14cae324 | 625 | if (rc) |
f96637be | 626 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
9fbc5908 SF |
627 | |
628 | return rc; | |
629 | } | |
630 | ||
2b149f11 | 631 | int |
96daf2b0 | 632 | setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp) |
9fbc5908 | 633 | { |
c8e56f1f | 634 | int rc; |
21e73393 | 635 | int baselen; |
d3686d54 | 636 | unsigned int tilen; |
2c957ddf | 637 | struct ntlmv2_resp *ntlmv2; |
d3686d54 SP |
638 | char ntlmv2_hash[16]; |
639 | unsigned char *tiblob = NULL; /* target info blob */ | |
98ce94c8 | 640 | __le64 rsp_timestamp; |
6d027cfd | 641 | |
3f618223 | 642 | if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) { |
2b149f11 | 643 | if (!ses->domainName) { |
39566443 GP |
644 | if (ses->domainAuto) { |
645 | rc = find_domain_name(ses, nls_cp); | |
646 | if (rc) { | |
647 | cifs_dbg(VFS, "error %d finding domain name\n", | |
648 | rc); | |
649 | goto setup_ntlmv2_rsp_ret; | |
650 | } | |
651 | } else { | |
652 | ses->domainName = kstrdup("", GFP_KERNEL); | |
2b149f11 SP |
653 | } |
654 | } | |
655 | } else { | |
9daa42e2 | 656 | rc = build_avpair_blob(ses, nls_cp); |
2b149f11 | 657 | if (rc) { |
f96637be | 658 | cifs_dbg(VFS, "error %d building av pair blob\n", rc); |
d3686d54 | 659 | goto setup_ntlmv2_rsp_ret; |
2b149f11 SP |
660 | } |
661 | } | |
a8ee0344 | 662 | |
98ce94c8 PS |
663 | /* Must be within 5 minutes of the server (or in range +/-2h |
664 | * in case of Mac OS X), so simply carry over server timestamp | |
665 | * (as Windows 7 does) | |
666 | */ | |
667 | rsp_timestamp = find_timestamp(ses); | |
668 | ||
21e73393 | 669 | baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp); |
d3686d54 SP |
670 | tilen = ses->auth_key.len; |
671 | tiblob = ses->auth_key.response; | |
672 | ||
673 | ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL); | |
21e73393 | 674 | if (!ses->auth_key.response) { |
4b550af5 | 675 | rc = -ENOMEM; |
d3686d54 | 676 | ses->auth_key.len = 0; |
21e73393 SP |
677 | goto setup_ntlmv2_rsp_ret; |
678 | } | |
d3686d54 | 679 | ses->auth_key.len += baselen; |
21e73393 | 680 | |
2c957ddf | 681 | ntlmv2 = (struct ntlmv2_resp *) |
21e73393 | 682 | (ses->auth_key.response + CIFS_SESS_KEY_SIZE); |
2c957ddf TG |
683 | ntlmv2->blob_signature = cpu_to_le32(0x00000101); |
684 | ntlmv2->reserved = 0; | |
98ce94c8 PS |
685 | ntlmv2->time = rsp_timestamp; |
686 | ||
2c957ddf TG |
687 | get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal)); |
688 | ntlmv2->reserved2 = 0; | |
21e73393 | 689 | |
d3686d54 | 690 | memcpy(ses->auth_key.response + baselen, tiblob, tilen); |
21e73393 | 691 | |
bd975d1e RV |
692 | mutex_lock(&ses->server->srv_mutex); |
693 | ||
82fb82be AA |
694 | rc = cifs_alloc_hash("hmac(md5)", |
695 | &ses->server->secmech.hmacmd5, | |
696 | &ses->server->secmech.sdeschmacmd5); | |
95dc8dd1 | 697 | if (rc) { |
bd975d1e | 698 | goto unlock; |
95dc8dd1 SF |
699 | } |
700 | ||
f7c5445a | 701 | /* calculate ntlmv2_hash */ |
d3686d54 | 702 | rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp); |
2b149f11 | 703 | if (rc) { |
f96637be | 704 | cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc); |
bd975d1e | 705 | goto unlock; |
2b149f11 | 706 | } |
f7c5445a SP |
707 | |
708 | /* calculate first part of the client response (CR1) */ | |
d3686d54 | 709 | rc = CalcNTLMv2_response(ses, ntlmv2_hash); |
307fbd31 | 710 | if (rc) { |
f96637be | 711 | cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc); |
bd975d1e | 712 | goto unlock; |
307fbd31 | 713 | } |
b609f06a | 714 | |
5d0d2882 | 715 | /* now calculate the session key for NTLMv2 */ |
14cae324 | 716 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
d3686d54 | 717 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 718 | if (rc) { |
f96637be JP |
719 | cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", |
720 | __func__); | |
bd975d1e | 721 | goto unlock; |
14cae324 | 722 | } |
307fbd31 SP |
723 | |
724 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
725 | if (rc) { | |
f96637be | 726 | cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__); |
bd975d1e | 727 | goto unlock; |
307fbd31 SP |
728 | } |
729 | ||
14cae324 | 730 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
2c957ddf | 731 | ntlmv2->ntlmv2_hash, |
307fbd31 | 732 | CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 733 | if (rc) { |
f96637be | 734 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
bd975d1e | 735 | goto unlock; |
14cae324 | 736 | } |
307fbd31 SP |
737 | |
738 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
739 | ses->auth_key.response); | |
14cae324 | 740 | if (rc) |
f96637be | 741 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
2b149f11 | 742 | |
bd975d1e RV |
743 | unlock: |
744 | mutex_unlock(&ses->server->srv_mutex); | |
2b149f11 | 745 | setup_ntlmv2_rsp_ret: |
d3686d54 | 746 | kfree(tiblob); |
2b149f11 SP |
747 | |
748 | return rc; | |
6d027cfd SF |
749 | } |
750 | ||
d2b91521 | 751 | int |
96daf2b0 | 752 | calc_seckey(struct cifs_ses *ses) |
d2b91521 SP |
753 | { |
754 | int rc; | |
9651ddba | 755 | struct crypto_skcipher *tfm_arc4; |
d2b91521 | 756 | struct scatterlist sgin, sgout; |
9651ddba | 757 | struct skcipher_request *req; |
5f4b5569 SP |
758 | unsigned char *sec_key; |
759 | ||
760 | sec_key = kmalloc(CIFS_SESS_KEY_SIZE, GFP_KERNEL); | |
761 | if (sec_key == NULL) | |
762 | return -ENOMEM; | |
d2b91521 SP |
763 | |
764 | get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE); | |
765 | ||
9651ddba | 766 | tfm_arc4 = crypto_alloc_skcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC); |
7a8587e7 SP |
767 | if (IS_ERR(tfm_arc4)) { |
768 | rc = PTR_ERR(tfm_arc4); | |
f96637be | 769 | cifs_dbg(VFS, "could not allocate crypto API arc4\n"); |
5f4b5569 | 770 | goto out; |
d2b91521 SP |
771 | } |
772 | ||
9651ddba | 773 | rc = crypto_skcipher_setkey(tfm_arc4, ses->auth_key.response, |
d2b91521 | 774 | CIFS_SESS_KEY_SIZE); |
14cae324 | 775 | if (rc) { |
f96637be JP |
776 | cifs_dbg(VFS, "%s: Could not set response as a key\n", |
777 | __func__); | |
9651ddba HX |
778 | goto out_free_cipher; |
779 | } | |
780 | ||
781 | req = skcipher_request_alloc(tfm_arc4, GFP_KERNEL); | |
782 | if (!req) { | |
783 | rc = -ENOMEM; | |
784 | cifs_dbg(VFS, "could not allocate crypto API arc4 request\n"); | |
785 | goto out_free_cipher; | |
14cae324 | 786 | } |
d2b91521 SP |
787 | |
788 | sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE); | |
d3686d54 | 789 | sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); |
d2b91521 | 790 | |
9651ddba HX |
791 | skcipher_request_set_callback(req, 0, NULL, NULL); |
792 | skcipher_request_set_crypt(req, &sgin, &sgout, CIFS_CPHTXT_SIZE, NULL); | |
793 | ||
794 | rc = crypto_skcipher_encrypt(req); | |
795 | skcipher_request_free(req); | |
d2b91521 | 796 | if (rc) { |
f96637be | 797 | cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc); |
9651ddba | 798 | goto out_free_cipher; |
d2b91521 SP |
799 | } |
800 | ||
801 | /* make secondary_key/nonce as session key */ | |
802 | memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE); | |
803 | /* and make len as that of session key only */ | |
804 | ses->auth_key.len = CIFS_SESS_KEY_SIZE; | |
805 | ||
9651ddba HX |
806 | out_free_cipher: |
807 | crypto_free_skcipher(tfm_arc4); | |
5f4b5569 SP |
808 | out: |
809 | kfree(sec_key); | |
14cae324 | 810 | return rc; |
d2b91521 SP |
811 | } |
812 | ||
813 | void | |
026e93dc | 814 | cifs_crypto_secmech_release(struct TCP_Server_Info *server) |
d2b91521 | 815 | { |
95dc8dd1 | 816 | if (server->secmech.cmacaes) { |
429b46f4 | 817 | crypto_free_shash(server->secmech.cmacaes); |
95dc8dd1 SF |
818 | server->secmech.cmacaes = NULL; |
819 | } | |
429b46f4 | 820 | |
95dc8dd1 | 821 | if (server->secmech.hmacsha256) { |
3c1bf7e4 | 822 | crypto_free_shash(server->secmech.hmacsha256); |
95dc8dd1 SF |
823 | server->secmech.hmacsha256 = NULL; |
824 | } | |
3c1bf7e4 | 825 | |
95dc8dd1 | 826 | if (server->secmech.md5) { |
d2b91521 | 827 | crypto_free_shash(server->secmech.md5); |
95dc8dd1 SF |
828 | server->secmech.md5 = NULL; |
829 | } | |
d2b91521 | 830 | |
70e80655 | 831 | if (server->secmech.sha512) { |
5fcd7f3f AA |
832 | crypto_free_shash(server->secmech.sha512); |
833 | server->secmech.sha512 = NULL; | |
834 | } | |
835 | ||
95dc8dd1 | 836 | if (server->secmech.hmacmd5) { |
d2b91521 | 837 | crypto_free_shash(server->secmech.hmacmd5); |
95dc8dd1 SF |
838 | server->secmech.hmacmd5 = NULL; |
839 | } | |
d2b91521 | 840 | |
026e93dc PS |
841 | if (server->secmech.ccmaesencrypt) { |
842 | crypto_free_aead(server->secmech.ccmaesencrypt); | |
843 | server->secmech.ccmaesencrypt = NULL; | |
844 | } | |
845 | ||
846 | if (server->secmech.ccmaesdecrypt) { | |
847 | crypto_free_aead(server->secmech.ccmaesdecrypt); | |
848 | server->secmech.ccmaesdecrypt = NULL; | |
849 | } | |
850 | ||
429b46f4 | 851 | kfree(server->secmech.sdesccmacaes); |
95dc8dd1 | 852 | server->secmech.sdesccmacaes = NULL; |
3c1bf7e4 | 853 | kfree(server->secmech.sdeschmacsha256); |
95dc8dd1 | 854 | server->secmech.sdeschmacsha256 = NULL; |
d2b91521 | 855 | kfree(server->secmech.sdeschmacmd5); |
95dc8dd1 | 856 | server->secmech.sdeschmacmd5 = NULL; |
d2b91521 | 857 | kfree(server->secmech.sdescmd5); |
95dc8dd1 | 858 | server->secmech.sdescmd5 = NULL; |
5fcd7f3f AA |
859 | kfree(server->secmech.sdescsha512); |
860 | server->secmech.sdescsha512 = NULL; | |
d2b91521 | 861 | } |