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> |
9651ddba | 36 | #include <crypto/skcipher.h> |
026e93dc | 37 | #include <crypto/aead.h> |
1da177e4 | 38 | |
16c568ef AV |
39 | int __cifs_calc_signature(struct smb_rqst *rqst, |
40 | struct TCP_Server_Info *server, char *signature, | |
41 | struct shash_desc *shash) | |
84afc29b | 42 | { |
e9917a00 | 43 | int i; |
307fbd31 | 44 | int rc; |
bf5ea0e2 JL |
45 | struct kvec *iov = rqst->rq_iov; |
46 | int n_vec = rqst->rq_nvec; | |
c713c877 | 47 | int is_smb2 = server->vals->header_preamble_size == 0; |
84afc29b | 48 | |
c713c877 RS |
49 | /* iov[0] is actual data and not the rfc1002 length for SMB2+ */ |
50 | if (is_smb2) { | |
83ffdead PA |
51 | if (iov[0].iov_len <= 4) |
52 | return -EIO; | |
53 | i = 0; | |
c713c877 RS |
54 | } else { |
55 | if (n_vec < 2 || iov[0].iov_len != 4) | |
56 | return -EIO; | |
83ffdead | 57 | i = 1; /* skip rfc1002 length */ |
c713c877 RS |
58 | } |
59 | ||
83ffdead | 60 | for (; i < n_vec; i++) { |
745542e2 JL |
61 | if (iov[i].iov_len == 0) |
62 | continue; | |
ffdd6e4d | 63 | if (iov[i].iov_base == NULL) { |
f96637be | 64 | cifs_dbg(VFS, "null iovec entry\n"); |
e9917a00 | 65 | return -EIO; |
745542e2 | 66 | } |
83ffdead | 67 | |
738f9de5 PS |
68 | rc = crypto_shash_update(shash, |
69 | iov[i].iov_base, iov[i].iov_len); | |
14cae324 | 70 | if (rc) { |
f96637be JP |
71 | cifs_dbg(VFS, "%s: Could not update with payload\n", |
72 | __func__); | |
14cae324 SP |
73 | return rc; |
74 | } | |
e9917a00 | 75 | } |
84afc29b | 76 | |
fb308a6f JL |
77 | /* now hash over the rq_pages array */ |
78 | for (i = 0; i < rqst->rq_npages; i++) { | |
4c0d2a5a LL |
79 | void *kaddr; |
80 | unsigned int len, offset; | |
16c568ef | 81 | |
4c0d2a5a LL |
82 | rqst_page_get_length(rqst, i, &len, &offset); |
83 | ||
84 | kaddr = (char *) kmap(rqst->rq_pages[i]) + offset; | |
16c568ef AV |
85 | |
86 | crypto_shash_update(shash, kaddr, len); | |
fb308a6f | 87 | |
fb308a6f JL |
88 | kunmap(rqst->rq_pages[i]); |
89 | } | |
90 | ||
16c568ef | 91 | rc = crypto_shash_final(shash, signature); |
14cae324 | 92 | if (rc) |
16c568ef | 93 | cifs_dbg(VFS, "%s: Could not generate hash\n", __func__); |
84afc29b | 94 | |
307fbd31 | 95 | return rc; |
84afc29b SF |
96 | } |
97 | ||
16c568ef AV |
98 | /* |
99 | * Calculate and return the CIFS signature based on the mac key and SMB PDU. | |
100 | * The 16 byte signature must be allocated by the caller. Note we only use the | |
101 | * 1st eight bytes and that the smb header signature field on input contains | |
102 | * the sequence number before this function is called. Also, this function | |
103 | * should be called with the server->srv_mutex held. | |
104 | */ | |
105 | static int cifs_calc_signature(struct smb_rqst *rqst, | |
106 | struct TCP_Server_Info *server, char *signature) | |
107 | { | |
108 | int rc; | |
109 | ||
110 | if (!rqst->rq_iov || !signature || !server) | |
111 | return -EINVAL; | |
112 | ||
82fb82be AA |
113 | rc = cifs_alloc_hash("md5", &server->secmech.md5, |
114 | &server->secmech.sdescmd5); | |
115 | if (rc) | |
116 | return -1; | |
16c568ef AV |
117 | |
118 | rc = crypto_shash_init(&server->secmech.sdescmd5->shash); | |
119 | if (rc) { | |
120 | cifs_dbg(VFS, "%s: Could not init md5\n", __func__); | |
121 | return rc; | |
122 | } | |
123 | ||
124 | rc = crypto_shash_update(&server->secmech.sdescmd5->shash, | |
125 | server->session_key.response, server->session_key.len); | |
126 | if (rc) { | |
127 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); | |
128 | return rc; | |
129 | } | |
130 | ||
c713c877 | 131 | return __cifs_calc_signature(rqst, server, signature, |
16c568ef AV |
132 | &server->secmech.sdescmd5->shash); |
133 | } | |
134 | ||
a0f8b4fb | 135 | /* must be called with server->srv_mutex held */ |
bf5ea0e2 | 136 | int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server, |
63d2583f | 137 | __u32 *pexpected_response_sequence_number) |
84afc29b SF |
138 | { |
139 | int rc = 0; | |
140 | char smb_signature[20]; | |
bf5ea0e2 | 141 | struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
84afc29b | 142 | |
738f9de5 PS |
143 | if (rqst->rq_iov[0].iov_len != 4 || |
144 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
145 | return -EIO; | |
146 | ||
ffdd6e4d | 147 | if ((cifs_pdu == NULL) || (server == NULL)) |
84afc29b SF |
148 | return -EINVAL; |
149 | ||
998d6fcb JL |
150 | if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) || |
151 | server->tcpStatus == CifsNeedNegotiate) | |
84afc29b SF |
152 | return rc; |
153 | ||
998d6fcb | 154 | if (!server->session_estab) { |
b4dacbc2 | 155 | memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8); |
998d6fcb JL |
156 | return rc; |
157 | } | |
158 | ||
ffdd6e4d | 159 | cifs_pdu->Signature.Sequence.SequenceNumber = |
84afc29b | 160 | cpu_to_le32(server->sequence_number); |
ffdd6e4d | 161 | cifs_pdu->Signature.Sequence.Reserved = 0; |
84afc29b | 162 | |
0124cc45 JL |
163 | *pexpected_response_sequence_number = ++server->sequence_number; |
164 | ++server->sequence_number; | |
84afc29b | 165 | |
bf5ea0e2 | 166 | rc = cifs_calc_signature(rqst, server, smb_signature); |
ffdd6e4d SF |
167 | if (rc) |
168 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |
169 | else | |
170 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
84afc29b | 171 | |
ffdd6e4d | 172 | return rc; |
84afc29b SF |
173 | } |
174 | ||
bf5ea0e2 JL |
175 | int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server, |
176 | __u32 *pexpected_response_sequence) | |
177 | { | |
178 | struct smb_rqst rqst = { .rq_iov = iov, | |
179 | .rq_nvec = n_vec }; | |
180 | ||
181 | return cifs_sign_rqst(&rqst, server, pexpected_response_sequence); | |
182 | } | |
183 | ||
826a95e4 JL |
184 | /* must be called with server->srv_mutex held */ |
185 | int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server, | |
186 | __u32 *pexpected_response_sequence_number) | |
187 | { | |
738f9de5 | 188 | struct kvec iov[2]; |
826a95e4 | 189 | |
738f9de5 PS |
190 | iov[0].iov_base = cifs_pdu; |
191 | iov[0].iov_len = 4; | |
192 | iov[1].iov_base = (char *)cifs_pdu + 4; | |
193 | iov[1].iov_len = be32_to_cpu(cifs_pdu->smb_buf_length); | |
826a95e4 | 194 | |
738f9de5 | 195 | return cifs_sign_smbv(iov, 2, server, |
826a95e4 JL |
196 | pexpected_response_sequence_number); |
197 | } | |
198 | ||
bf5ea0e2 | 199 | int cifs_verify_signature(struct smb_rqst *rqst, |
21e73393 | 200 | struct TCP_Server_Info *server, |
ffdd6e4d | 201 | __u32 expected_sequence_number) |
1da177e4 | 202 | { |
c8e56f1f | 203 | unsigned int rc; |
1da177e4 LT |
204 | char server_response_sig[8]; |
205 | char what_we_think_sig_should_be[20]; | |
bf5ea0e2 | 206 | struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
1da177e4 | 207 | |
738f9de5 PS |
208 | if (rqst->rq_iov[0].iov_len != 4 || |
209 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
210 | return -EIO; | |
211 | ||
21e73393 | 212 | if (cifs_pdu == NULL || server == NULL) |
1da177e4 LT |
213 | return -EINVAL; |
214 | ||
9c4843ea | 215 | if (!server->session_estab) |
1da177e4 LT |
216 | return 0; |
217 | ||
218 | if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) { | |
50c2f753 | 219 | struct smb_com_lock_req *pSMB = |
ffdd6e4d SF |
220 | (struct smb_com_lock_req *)cifs_pdu; |
221 | if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) | |
1da177e4 LT |
222 | return 0; |
223 | } | |
224 | ||
50c2f753 SF |
225 | /* BB what if signatures are supposed to be on for session but |
226 | server does not send one? BB */ | |
227 | ||
1da177e4 | 228 | /* Do not need to verify session setups with signature "BSRSPYL " */ |
50c2f753 | 229 | if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0) |
f96637be JP |
230 | cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n", |
231 | cifs_pdu->Command); | |
1da177e4 LT |
232 | |
233 | /* save off the origiginal signature so we can modify the smb and check | |
234 | its signature against what the server sent */ | |
50c2f753 | 235 | memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8); |
1da177e4 | 236 | |
50c2f753 SF |
237 | cifs_pdu->Signature.Sequence.SequenceNumber = |
238 | cpu_to_le32(expected_sequence_number); | |
1da177e4 LT |
239 | cifs_pdu->Signature.Sequence.Reserved = 0; |
240 | ||
157c2491 | 241 | mutex_lock(&server->srv_mutex); |
bf5ea0e2 | 242 | rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be); |
157c2491 | 243 | mutex_unlock(&server->srv_mutex); |
1da177e4 | 244 | |
50c2f753 | 245 | if (rc) |
1da177e4 LT |
246 | return rc; |
247 | ||
50c2f753 SF |
248 | /* cifs_dump_mem("what we think it should be: ", |
249 | what_we_think_sig_should_be, 16); */ | |
1da177e4 | 250 | |
50c2f753 | 251 | if (memcmp(server_response_sig, what_we_think_sig_should_be, 8)) |
1da177e4 LT |
252 | return -EACCES; |
253 | else | |
254 | return 0; | |
255 | ||
256 | } | |
257 | ||
21e73393 | 258 | /* first calculate 24 bytes ntlm response and then 16 byte session key */ |
9ef5992e | 259 | int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp) |
1da177e4 | 260 | { |
ee2c9258 | 261 | int rc = 0; |
21e73393 SP |
262 | unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE; |
263 | char temp_key[CIFS_SESS_KEY_SIZE]; | |
264 | ||
265 | if (!ses) | |
1da177e4 LT |
266 | return -EINVAL; |
267 | ||
21e73393 | 268 | ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL); |
f96637be | 269 | if (!ses->auth_key.response) |
21e73393 | 270 | return -ENOMEM; |
f96637be | 271 | |
21e73393 SP |
272 | ses->auth_key.len = temp_len; |
273 | ||
ee2c9258 | 274 | rc = SMBNTencrypt(ses->password, ses->server->cryptkey, |
9ef5992e | 275 | ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp); |
ee2c9258 | 276 | if (rc) { |
f96637be JP |
277 | cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n", |
278 | __func__, rc); | |
ee2c9258 SP |
279 | return rc; |
280 | } | |
281 | ||
9ef5992e | 282 | rc = E_md4hash(ses->password, temp_key, nls_cp); |
ee2c9258 | 283 | if (rc) { |
f96637be JP |
284 | cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n", |
285 | __func__, rc); | |
ee2c9258 SP |
286 | return rc; |
287 | } | |
21e73393 | 288 | |
ee2c9258 SP |
289 | rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE); |
290 | if (rc) | |
f96637be JP |
291 | cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n", |
292 | __func__, rc); | |
21e73393 | 293 | |
ee2c9258 | 294 | return rc; |
1da177e4 LT |
295 | } |
296 | ||
7c7b25bc | 297 | #ifdef CONFIG_CIFS_WEAK_PW_HASH |
43988d76 | 298 | int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt, |
4e53a3fb | 299 | char *lnm_session_key) |
7c7b25bc SF |
300 | { |
301 | int i; | |
43988d76 | 302 | int rc; |
97f4b727 | 303 | char password_with_pad[CIFS_ENCPWD_SIZE] = {0}; |
7c7b25bc | 304 | |
4e53a3fb JL |
305 | if (password) |
306 | strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE); | |
307 | ||
04912d6a | 308 | if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) { |
4e53a3fb JL |
309 | memcpy(lnm_session_key, password_with_pad, |
310 | CIFS_ENCPWD_SIZE); | |
43988d76 | 311 | return 0; |
4e53a3fb | 312 | } |
bdc4bf6e | 313 | |
7c7b25bc SF |
314 | /* calculate old style session key */ |
315 | /* calling toupper is less broken than repeatedly | |
316 | calling nls_toupper would be since that will never | |
317 | work for UTF8, but neither handles multibyte code pages | |
318 | but the only alternative would be converting to UCS-16 (Unicode) | |
319 | (using a routine something like UniStrupr) then | |
320 | uppercasing and then converting back from Unicode - which | |
321 | would only worth doing it if we knew it were utf8. Basically | |
322 | utf8 and other multibyte codepages each need their own strupper | |
323 | function since a byte at a time will ont work. */ | |
324 | ||
ef571cad | 325 | for (i = 0; i < CIFS_ENCPWD_SIZE; i++) |
7c7b25bc | 326 | password_with_pad[i] = toupper(password_with_pad[i]); |
7c7b25bc | 327 | |
43988d76 | 328 | rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key); |
4e53a3fb | 329 | |
43988d76 | 330 | return rc; |
7c7b25bc SF |
331 | } |
332 | #endif /* CIFS_WEAK_PW_HASH */ | |
333 | ||
9daa42e2 SP |
334 | /* Build a proper attribute value/target info pairs blob. |
335 | * Fill in netbios and dns domain name and workstation name | |
336 | * and client time (total five av pairs and + one end of fields indicator. | |
337 | * Allocate domain name which gets freed when session struct is deallocated. | |
2b149f11 SP |
338 | */ |
339 | static int | |
96daf2b0 | 340 | build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 | 341 | { |
9daa42e2 | 342 | unsigned int dlen; |
cfbd6f84 | 343 | unsigned int size = 2 * sizeof(struct ntlmssp2_name); |
9daa42e2 SP |
344 | char *defdmname = "WORKGROUP"; |
345 | unsigned char *blobptr; | |
2b149f11 SP |
346 | struct ntlmssp2_name *attrptr; |
347 | ||
9daa42e2 SP |
348 | if (!ses->domainName) { |
349 | ses->domainName = kstrdup(defdmname, GFP_KERNEL); | |
350 | if (!ses->domainName) | |
351 | return -ENOMEM; | |
352 | } | |
353 | ||
354 | dlen = strlen(ses->domainName); | |
9daa42e2 | 355 | |
cfbd6f84 SP |
356 | /* |
357 | * The length of this blob is two times the size of a | |
358 | * structure (av pair) which holds name/size | |
359 | * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) + | |
360 | * unicode length of a netbios domain name | |
9daa42e2 | 361 | */ |
cfbd6f84 | 362 | ses->auth_key.len = size + 2 * dlen; |
d3686d54 SP |
363 | ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL); |
364 | if (!ses->auth_key.response) { | |
365 | ses->auth_key.len = 0; | |
2b149f11 SP |
366 | return -ENOMEM; |
367 | } | |
9daa42e2 | 368 | |
d3686d54 | 369 | blobptr = ses->auth_key.response; |
9daa42e2 SP |
370 | attrptr = (struct ntlmssp2_name *) blobptr; |
371 | ||
cfbd6f84 SP |
372 | /* |
373 | * As defined in MS-NTLM 3.3.2, just this av pair field | |
374 | * is sufficient as part of the temp | |
375 | */ | |
9daa42e2 SP |
376 | attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME); |
377 | attrptr->length = cpu_to_le16(2 * dlen); | |
378 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
acbbb76a | 379 | cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp); |
9daa42e2 | 380 | |
2b149f11 SP |
381 | return 0; |
382 | } | |
383 | ||
384 | /* Server has provided av pairs/target info in the type 2 challenge | |
385 | * packet and we have plucked it and stored within smb session. | |
386 | * We parse that blob here to find netbios domain name to be used | |
387 | * as part of ntlmv2 authentication (in Target String), if not already | |
388 | * specified on the command line. | |
389 | * If this function returns without any error but without fetching | |
390 | * domain name, authentication may fail against some server but | |
391 | * may not fail against other (those who are not very particular | |
392 | * about target string i.e. for some, just user name might suffice. | |
393 | */ | |
394 | static int | |
96daf2b0 | 395 | find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 SP |
396 | { |
397 | unsigned int attrsize; | |
398 | unsigned int type; | |
399 | unsigned int onesize = sizeof(struct ntlmssp2_name); | |
400 | unsigned char *blobptr; | |
401 | unsigned char *blobend; | |
402 | struct ntlmssp2_name *attrptr; | |
403 | ||
d3686d54 | 404 | if (!ses->auth_key.len || !ses->auth_key.response) |
2b149f11 SP |
405 | return 0; |
406 | ||
d3686d54 SP |
407 | blobptr = ses->auth_key.response; |
408 | blobend = blobptr + ses->auth_key.len; | |
2b149f11 SP |
409 | |
410 | while (blobptr + onesize < blobend) { | |
411 | attrptr = (struct ntlmssp2_name *) blobptr; | |
412 | type = le16_to_cpu(attrptr->type); | |
413 | if (type == NTLMSSP_AV_EOL) | |
414 | break; | |
415 | blobptr += 2; /* advance attr type */ | |
416 | attrsize = le16_to_cpu(attrptr->length); | |
417 | blobptr += 2; /* advance attr size */ | |
418 | if (blobptr + attrsize > blobend) | |
419 | break; | |
420 | if (type == NTLMSSP_AV_NB_DOMAIN_NAME) { | |
057d6332 | 421 | if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN) |
2b149f11 SP |
422 | break; |
423 | if (!ses->domainName) { | |
424 | ses->domainName = | |
425 | kmalloc(attrsize + 1, GFP_KERNEL); | |
426 | if (!ses->domainName) | |
427 | return -ENOMEM; | |
acbbb76a | 428 | cifs_from_utf16(ses->domainName, |
2b149f11 | 429 | (__le16 *)blobptr, attrsize, attrsize, |
b693855f | 430 | nls_cp, NO_MAP_UNI_RSVD); |
2b149f11 SP |
431 | break; |
432 | } | |
433 | } | |
434 | blobptr += attrsize; /* advance attr value */ | |
435 | } | |
436 | ||
437 | return 0; | |
438 | } | |
439 | ||
98ce94c8 PS |
440 | /* Server has provided av pairs/target info in the type 2 challenge |
441 | * packet and we have plucked it and stored within smb session. | |
442 | * We parse that blob here to find the server given timestamp | |
443 | * as part of ntlmv2 authentication (or local current time as | |
444 | * default in case of failure) | |
445 | */ | |
446 | static __le64 | |
447 | find_timestamp(struct cifs_ses *ses) | |
448 | { | |
449 | unsigned int attrsize; | |
450 | unsigned int type; | |
451 | unsigned int onesize = sizeof(struct ntlmssp2_name); | |
452 | unsigned char *blobptr; | |
453 | unsigned char *blobend; | |
454 | struct ntlmssp2_name *attrptr; | |
e37fea58 | 455 | struct timespec ts; |
98ce94c8 PS |
456 | |
457 | if (!ses->auth_key.len || !ses->auth_key.response) | |
458 | return 0; | |
459 | ||
460 | blobptr = ses->auth_key.response; | |
461 | blobend = blobptr + ses->auth_key.len; | |
462 | ||
463 | while (blobptr + onesize < blobend) { | |
464 | attrptr = (struct ntlmssp2_name *) blobptr; | |
465 | type = le16_to_cpu(attrptr->type); | |
466 | if (type == NTLMSSP_AV_EOL) | |
467 | break; | |
468 | blobptr += 2; /* advance attr type */ | |
469 | attrsize = le16_to_cpu(attrptr->length); | |
470 | blobptr += 2; /* advance attr size */ | |
471 | if (blobptr + attrsize > blobend) | |
472 | break; | |
473 | if (type == NTLMSSP_AV_TIMESTAMP) { | |
474 | if (attrsize == sizeof(u64)) | |
475 | return *((__le64 *)blobptr); | |
476 | } | |
477 | blobptr += attrsize; /* advance attr value */ | |
478 | } | |
479 | ||
e37fea58 DD |
480 | ktime_get_real_ts(&ts); |
481 | return cpu_to_le64(cifs_UnixTimeToNT(ts)); | |
98ce94c8 PS |
482 | } |
483 | ||
96daf2b0 | 484 | static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash, |
50c2f753 | 485 | const struct nls_table *nls_cp) |
a8ee0344 SF |
486 | { |
487 | int rc = 0; | |
488 | int len; | |
307fbd31 | 489 | char nt_hash[CIFS_NTHASH_SIZE]; |
fdf96a90 | 490 | __le16 *user; |
50c2f753 | 491 | wchar_t *domain; |
307fbd31 | 492 | wchar_t *server; |
a8ee0344 | 493 | |
307fbd31 | 494 | if (!ses->server->secmech.sdeschmacmd5) { |
f96637be | 495 | cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); |
307fbd31 SP |
496 | return -1; |
497 | } | |
56234e27 | 498 | |
c8e56f1f | 499 | /* calculate md4 hash of password */ |
9ef5992e | 500 | E_md4hash(ses->password, nt_hash, nls_cp); |
9fbc5908 | 501 | |
14cae324 | 502 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash, |
307fbd31 | 503 | CIFS_NTHASH_SIZE); |
14cae324 | 504 | if (rc) { |
f96637be | 505 | cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__); |
14cae324 SP |
506 | return rc; |
507 | } | |
307fbd31 SP |
508 | |
509 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
510 | if (rc) { | |
f96637be | 511 | cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__); |
307fbd31 SP |
512 | return rc; |
513 | } | |
a8ee0344 | 514 | |
fdf96a90 | 515 | /* convert ses->user_name to unicode */ |
04febabc | 516 | len = ses->user_name ? strlen(ses->user_name) : 0; |
1717ffc5 | 517 | user = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 518 | if (user == NULL) { |
307fbd31 | 519 | rc = -ENOMEM; |
14cae324 | 520 | return rc; |
307fbd31 | 521 | } |
04febabc JL |
522 | |
523 | if (len) { | |
fdf96a90 | 524 | len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp); |
04febabc JL |
525 | UniStrupr(user); |
526 | } else { | |
527 | memset(user, '\0', 2); | |
528 | } | |
307fbd31 | 529 | |
14cae324 | 530 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 | 531 | (char *)user, 2 * len); |
14cae324 SP |
532 | kfree(user); |
533 | if (rc) { | |
f96637be | 534 | cifs_dbg(VFS, "%s: Could not update with user\n", __func__); |
14cae324 SP |
535 | return rc; |
536 | } | |
a8ee0344 SF |
537 | |
538 | /* convert ses->domainName to unicode and uppercase */ | |
50c2f753 | 539 | if (ses->domainName) { |
1717ffc5 | 540 | len = strlen(ses->domainName); |
a8ee0344 | 541 | |
50c2f753 | 542 | domain = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 543 | if (domain == NULL) { |
307fbd31 | 544 | rc = -ENOMEM; |
14cae324 | 545 | return rc; |
307fbd31 | 546 | } |
acbbb76a SF |
547 | len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len, |
548 | nls_cp); | |
14cae324 | 549 | rc = |
307fbd31 SP |
550 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
551 | (char *)domain, 2 * len); | |
1717ffc5 | 552 | kfree(domain); |
14cae324 | 553 | if (rc) { |
f96637be JP |
554 | cifs_dbg(VFS, "%s: Could not update with domain\n", |
555 | __func__); | |
14cae324 SP |
556 | return rc; |
557 | } | |
8b7a4544 SF |
558 | } else { |
559 | /* We use ses->serverName if no domain name available */ | |
307fbd31 SP |
560 | len = strlen(ses->serverName); |
561 | ||
562 | server = kmalloc(2 + (len * 2), GFP_KERNEL); | |
563 | if (server == NULL) { | |
307fbd31 | 564 | rc = -ENOMEM; |
14cae324 | 565 | return rc; |
307fbd31 | 566 | } |
acbbb76a | 567 | len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len, |
307fbd31 | 568 | nls_cp); |
14cae324 | 569 | rc = |
307fbd31 SP |
570 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
571 | (char *)server, 2 * len); | |
572 | kfree(server); | |
14cae324 | 573 | if (rc) { |
f96637be JP |
574 | cifs_dbg(VFS, "%s: Could not update with server\n", |
575 | __func__); | |
14cae324 SP |
576 | return rc; |
577 | } | |
1717ffc5 | 578 | } |
307fbd31 SP |
579 | |
580 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
d3686d54 | 581 | ntlmv2_hash); |
14cae324 | 582 | if (rc) |
f96637be | 583 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
307fbd31 | 584 | |
307fbd31 SP |
585 | return rc; |
586 | } | |
587 | ||
588 | static int | |
96daf2b0 | 589 | CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash) |
307fbd31 SP |
590 | { |
591 | int rc; | |
2c957ddf TG |
592 | struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *) |
593 | (ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
594 | unsigned int hash_len; | |
595 | ||
596 | /* The MD5 hash starts at challenge_key.key */ | |
597 | hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE + | |
598 | offsetof(struct ntlmv2_resp, challenge.key[0])); | |
307fbd31 SP |
599 | |
600 | if (!ses->server->secmech.sdeschmacmd5) { | |
f96637be | 601 | cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); |
307fbd31 SP |
602 | return -1; |
603 | } | |
604 | ||
14cae324 | 605 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
2c957ddf | 606 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 607 | if (rc) { |
f96637be JP |
608 | cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", |
609 | __func__); | |
14cae324 SP |
610 | return rc; |
611 | } | |
307fbd31 SP |
612 | |
613 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
614 | if (rc) { | |
f96637be | 615 | cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__); |
307fbd31 SP |
616 | return rc; |
617 | } | |
618 | ||
3f618223 | 619 | if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) |
2c957ddf TG |
620 | memcpy(ntlmv2->challenge.key, |
621 | ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); | |
d3ba50b1 | 622 | else |
2c957ddf TG |
623 | memcpy(ntlmv2->challenge.key, |
624 | ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); | |
14cae324 | 625 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
2c957ddf | 626 | ntlmv2->challenge.key, hash_len); |
14cae324 | 627 | if (rc) { |
f96637be | 628 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
14cae324 SP |
629 | return rc; |
630 | } | |
307fbd31 | 631 | |
2c957ddf | 632 | /* Note that the MD5 digest over writes anon.challenge_key.key */ |
307fbd31 | 633 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, |
2c957ddf | 634 | ntlmv2->ntlmv2_hash); |
14cae324 | 635 | if (rc) |
f96637be | 636 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
9fbc5908 SF |
637 | |
638 | return rc; | |
639 | } | |
640 | ||
2b149f11 | 641 | int |
96daf2b0 | 642 | setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp) |
9fbc5908 | 643 | { |
c8e56f1f | 644 | int rc; |
21e73393 | 645 | int baselen; |
d3686d54 | 646 | unsigned int tilen; |
2c957ddf | 647 | struct ntlmv2_resp *ntlmv2; |
d3686d54 SP |
648 | char ntlmv2_hash[16]; |
649 | unsigned char *tiblob = NULL; /* target info blob */ | |
98ce94c8 | 650 | __le64 rsp_timestamp; |
6d027cfd | 651 | |
3f618223 | 652 | if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) { |
2b149f11 | 653 | if (!ses->domainName) { |
39566443 GP |
654 | if (ses->domainAuto) { |
655 | rc = find_domain_name(ses, nls_cp); | |
656 | if (rc) { | |
657 | cifs_dbg(VFS, "error %d finding domain name\n", | |
658 | rc); | |
659 | goto setup_ntlmv2_rsp_ret; | |
660 | } | |
661 | } else { | |
662 | ses->domainName = kstrdup("", GFP_KERNEL); | |
2b149f11 SP |
663 | } |
664 | } | |
665 | } else { | |
9daa42e2 | 666 | rc = build_avpair_blob(ses, nls_cp); |
2b149f11 | 667 | if (rc) { |
f96637be | 668 | cifs_dbg(VFS, "error %d building av pair blob\n", rc); |
d3686d54 | 669 | goto setup_ntlmv2_rsp_ret; |
2b149f11 SP |
670 | } |
671 | } | |
a8ee0344 | 672 | |
98ce94c8 PS |
673 | /* Must be within 5 minutes of the server (or in range +/-2h |
674 | * in case of Mac OS X), so simply carry over server timestamp | |
675 | * (as Windows 7 does) | |
676 | */ | |
677 | rsp_timestamp = find_timestamp(ses); | |
678 | ||
21e73393 | 679 | baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp); |
d3686d54 SP |
680 | tilen = ses->auth_key.len; |
681 | tiblob = ses->auth_key.response; | |
682 | ||
683 | ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL); | |
21e73393 | 684 | if (!ses->auth_key.response) { |
4b550af5 | 685 | rc = -ENOMEM; |
d3686d54 | 686 | ses->auth_key.len = 0; |
21e73393 SP |
687 | goto setup_ntlmv2_rsp_ret; |
688 | } | |
d3686d54 | 689 | ses->auth_key.len += baselen; |
21e73393 | 690 | |
2c957ddf | 691 | ntlmv2 = (struct ntlmv2_resp *) |
21e73393 | 692 | (ses->auth_key.response + CIFS_SESS_KEY_SIZE); |
2c957ddf TG |
693 | ntlmv2->blob_signature = cpu_to_le32(0x00000101); |
694 | ntlmv2->reserved = 0; | |
98ce94c8 PS |
695 | ntlmv2->time = rsp_timestamp; |
696 | ||
2c957ddf TG |
697 | get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal)); |
698 | ntlmv2->reserved2 = 0; | |
21e73393 | 699 | |
d3686d54 | 700 | memcpy(ses->auth_key.response + baselen, tiblob, tilen); |
21e73393 | 701 | |
bd975d1e RV |
702 | mutex_lock(&ses->server->srv_mutex); |
703 | ||
82fb82be AA |
704 | rc = cifs_alloc_hash("hmac(md5)", |
705 | &ses->server->secmech.hmacmd5, | |
706 | &ses->server->secmech.sdeschmacmd5); | |
95dc8dd1 | 707 | if (rc) { |
bd975d1e | 708 | goto unlock; |
95dc8dd1 SF |
709 | } |
710 | ||
f7c5445a | 711 | /* calculate ntlmv2_hash */ |
d3686d54 | 712 | rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp); |
2b149f11 | 713 | if (rc) { |
f96637be | 714 | cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc); |
bd975d1e | 715 | goto unlock; |
2b149f11 | 716 | } |
f7c5445a SP |
717 | |
718 | /* calculate first part of the client response (CR1) */ | |
d3686d54 | 719 | rc = CalcNTLMv2_response(ses, ntlmv2_hash); |
307fbd31 | 720 | if (rc) { |
f96637be | 721 | cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc); |
bd975d1e | 722 | goto unlock; |
307fbd31 | 723 | } |
b609f06a | 724 | |
5d0d2882 | 725 | /* now calculate the session key for NTLMv2 */ |
14cae324 | 726 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
d3686d54 | 727 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 728 | if (rc) { |
f96637be JP |
729 | cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", |
730 | __func__); | |
bd975d1e | 731 | goto unlock; |
14cae324 | 732 | } |
307fbd31 SP |
733 | |
734 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
735 | if (rc) { | |
f96637be | 736 | cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__); |
bd975d1e | 737 | goto unlock; |
307fbd31 SP |
738 | } |
739 | ||
14cae324 | 740 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
2c957ddf | 741 | ntlmv2->ntlmv2_hash, |
307fbd31 | 742 | CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 743 | if (rc) { |
f96637be | 744 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
bd975d1e | 745 | goto unlock; |
14cae324 | 746 | } |
307fbd31 SP |
747 | |
748 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
749 | ses->auth_key.response); | |
14cae324 | 750 | if (rc) |
f96637be | 751 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
2b149f11 | 752 | |
bd975d1e RV |
753 | unlock: |
754 | mutex_unlock(&ses->server->srv_mutex); | |
2b149f11 | 755 | setup_ntlmv2_rsp_ret: |
d3686d54 | 756 | kfree(tiblob); |
2b149f11 SP |
757 | |
758 | return rc; | |
6d027cfd SF |
759 | } |
760 | ||
d2b91521 | 761 | int |
96daf2b0 | 762 | calc_seckey(struct cifs_ses *ses) |
d2b91521 SP |
763 | { |
764 | int rc; | |
9651ddba | 765 | struct crypto_skcipher *tfm_arc4; |
d2b91521 | 766 | struct scatterlist sgin, sgout; |
9651ddba | 767 | struct skcipher_request *req; |
5f4b5569 SP |
768 | unsigned char *sec_key; |
769 | ||
770 | sec_key = kmalloc(CIFS_SESS_KEY_SIZE, GFP_KERNEL); | |
771 | if (sec_key == NULL) | |
772 | return -ENOMEM; | |
d2b91521 SP |
773 | |
774 | get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE); | |
775 | ||
9651ddba | 776 | tfm_arc4 = crypto_alloc_skcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC); |
7a8587e7 SP |
777 | if (IS_ERR(tfm_arc4)) { |
778 | rc = PTR_ERR(tfm_arc4); | |
f96637be | 779 | cifs_dbg(VFS, "could not allocate crypto API arc4\n"); |
5f4b5569 | 780 | goto out; |
d2b91521 SP |
781 | } |
782 | ||
9651ddba | 783 | rc = crypto_skcipher_setkey(tfm_arc4, ses->auth_key.response, |
d2b91521 | 784 | CIFS_SESS_KEY_SIZE); |
14cae324 | 785 | if (rc) { |
f96637be JP |
786 | cifs_dbg(VFS, "%s: Could not set response as a key\n", |
787 | __func__); | |
9651ddba HX |
788 | goto out_free_cipher; |
789 | } | |
790 | ||
791 | req = skcipher_request_alloc(tfm_arc4, GFP_KERNEL); | |
792 | if (!req) { | |
793 | rc = -ENOMEM; | |
794 | cifs_dbg(VFS, "could not allocate crypto API arc4 request\n"); | |
795 | goto out_free_cipher; | |
14cae324 | 796 | } |
d2b91521 SP |
797 | |
798 | sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE); | |
d3686d54 | 799 | sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); |
d2b91521 | 800 | |
9651ddba HX |
801 | skcipher_request_set_callback(req, 0, NULL, NULL); |
802 | skcipher_request_set_crypt(req, &sgin, &sgout, CIFS_CPHTXT_SIZE, NULL); | |
803 | ||
804 | rc = crypto_skcipher_encrypt(req); | |
805 | skcipher_request_free(req); | |
d2b91521 | 806 | if (rc) { |
f96637be | 807 | cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc); |
9651ddba | 808 | goto out_free_cipher; |
d2b91521 SP |
809 | } |
810 | ||
811 | /* make secondary_key/nonce as session key */ | |
812 | memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE); | |
813 | /* and make len as that of session key only */ | |
814 | ses->auth_key.len = CIFS_SESS_KEY_SIZE; | |
815 | ||
9651ddba HX |
816 | out_free_cipher: |
817 | crypto_free_skcipher(tfm_arc4); | |
5f4b5569 SP |
818 | out: |
819 | kfree(sec_key); | |
14cae324 | 820 | return rc; |
d2b91521 SP |
821 | } |
822 | ||
823 | void | |
026e93dc | 824 | cifs_crypto_secmech_release(struct TCP_Server_Info *server) |
d2b91521 | 825 | { |
95dc8dd1 | 826 | if (server->secmech.cmacaes) { |
429b46f4 | 827 | crypto_free_shash(server->secmech.cmacaes); |
95dc8dd1 SF |
828 | server->secmech.cmacaes = NULL; |
829 | } | |
429b46f4 | 830 | |
95dc8dd1 | 831 | if (server->secmech.hmacsha256) { |
3c1bf7e4 | 832 | crypto_free_shash(server->secmech.hmacsha256); |
95dc8dd1 SF |
833 | server->secmech.hmacsha256 = NULL; |
834 | } | |
3c1bf7e4 | 835 | |
95dc8dd1 | 836 | if (server->secmech.md5) { |
d2b91521 | 837 | crypto_free_shash(server->secmech.md5); |
95dc8dd1 SF |
838 | server->secmech.md5 = NULL; |
839 | } | |
d2b91521 | 840 | |
70e80655 | 841 | if (server->secmech.sha512) { |
5fcd7f3f AA |
842 | crypto_free_shash(server->secmech.sha512); |
843 | server->secmech.sha512 = NULL; | |
844 | } | |
845 | ||
95dc8dd1 | 846 | if (server->secmech.hmacmd5) { |
d2b91521 | 847 | crypto_free_shash(server->secmech.hmacmd5); |
95dc8dd1 SF |
848 | server->secmech.hmacmd5 = NULL; |
849 | } | |
d2b91521 | 850 | |
026e93dc PS |
851 | if (server->secmech.ccmaesencrypt) { |
852 | crypto_free_aead(server->secmech.ccmaesencrypt); | |
853 | server->secmech.ccmaesencrypt = NULL; | |
854 | } | |
855 | ||
856 | if (server->secmech.ccmaesdecrypt) { | |
857 | crypto_free_aead(server->secmech.ccmaesdecrypt); | |
858 | server->secmech.ccmaesdecrypt = NULL; | |
859 | } | |
860 | ||
429b46f4 | 861 | kfree(server->secmech.sdesccmacaes); |
95dc8dd1 | 862 | server->secmech.sdesccmacaes = NULL; |
3c1bf7e4 | 863 | kfree(server->secmech.sdeschmacsha256); |
95dc8dd1 | 864 | server->secmech.sdeschmacsha256 = NULL; |
d2b91521 | 865 | kfree(server->secmech.sdeschmacmd5); |
95dc8dd1 | 866 | server->secmech.sdeschmacmd5 = NULL; |
d2b91521 | 867 | kfree(server->secmech.sdescmd5); |
95dc8dd1 | 868 | server->secmech.sdescmd5 = NULL; |
5fcd7f3f AA |
869 | kfree(server->secmech.sdescsha512); |
870 | server->secmech.sdescsha512 = NULL; | |
d2b91521 | 871 | } |