Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/cifsencrypt.c | |
3 | * | |
95dc8dd1 | 4 | * Copyright (C) International Business Machines Corp., 2005,2013 |
1da177e4 LT |
5 | * Author(s): Steve French (sfrench@us.ibm.com) |
6 | * | |
7 | * This library is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU Lesser General Public License as published | |
9 | * by the Free Software Foundation; either version 2.1 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This library is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
15 | * the GNU Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public License | |
18 | * along with this library; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | ||
22 | #include <linux/fs.h> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
1da177e4 | 24 | #include "cifspdu.h" |
ffdd6e4d | 25 | #include "cifsglob.h" |
1da177e4 | 26 | #include "cifs_debug.h" |
1da177e4 LT |
27 | #include "cifs_unicode.h" |
28 | #include "cifsproto.h" | |
2b149f11 | 29 | #include "ntlmssp.h" |
7c7b25bc | 30 | #include <linux/ctype.h> |
6d027cfd | 31 | #include <linux/random.h> |
fb308a6f | 32 | #include <linux/highmem.h> |
1da177e4 | 33 | |
95dc8dd1 SF |
34 | static int |
35 | cifs_crypto_shash_md5_allocate(struct TCP_Server_Info *server) | |
36 | { | |
37 | int rc; | |
38 | unsigned int size; | |
39 | ||
40 | if (server->secmech.sdescmd5 != NULL) | |
41 | return 0; /* already allocated */ | |
42 | ||
43 | server->secmech.md5 = crypto_alloc_shash("md5", 0, 0); | |
44 | if (IS_ERR(server->secmech.md5)) { | |
45 | cifs_dbg(VFS, "could not allocate crypto md5\n"); | |
46 | return PTR_ERR(server->secmech.md5); | |
47 | } | |
48 | ||
49 | size = sizeof(struct shash_desc) + | |
50 | crypto_shash_descsize(server->secmech.md5); | |
51 | server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL); | |
52 | if (!server->secmech.sdescmd5) { | |
53 | rc = -ENOMEM; | |
54 | crypto_free_shash(server->secmech.md5); | |
55 | server->secmech.md5 = NULL; | |
56 | return rc; | |
57 | } | |
58 | server->secmech.sdescmd5->shash.tfm = server->secmech.md5; | |
59 | server->secmech.sdescmd5->shash.flags = 0x0; | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
157c2491 JL |
64 | /* |
65 | * Calculate and return the CIFS signature based on the mac key and SMB PDU. | |
66 | * The 16 byte signature must be allocated by the caller. Note we only use the | |
67 | * 1st eight bytes and that the smb header signature field on input contains | |
68 | * the sequence number before this function is called. Also, this function | |
69 | * should be called with the server->srv_mutex held. | |
70 | */ | |
bf5ea0e2 | 71 | static int cifs_calc_signature(struct smb_rqst *rqst, |
826a95e4 | 72 | struct TCP_Server_Info *server, char *signature) |
84afc29b | 73 | { |
e9917a00 | 74 | int i; |
307fbd31 | 75 | int rc; |
bf5ea0e2 JL |
76 | struct kvec *iov = rqst->rq_iov; |
77 | int n_vec = rqst->rq_nvec; | |
84afc29b | 78 | |
21e73393 | 79 | if (iov == NULL || signature == NULL || server == NULL) |
e9917a00 | 80 | return -EINVAL; |
84afc29b | 81 | |
307fbd31 | 82 | if (!server->secmech.sdescmd5) { |
95dc8dd1 SF |
83 | rc = cifs_crypto_shash_md5_allocate(server); |
84 | if (rc) { | |
85 | cifs_dbg(VFS, "%s: Can't alloc md5 crypto\n", __func__); | |
86 | return -1; | |
87 | } | |
307fbd31 SP |
88 | } |
89 | ||
90 | rc = crypto_shash_init(&server->secmech.sdescmd5->shash); | |
91 | if (rc) { | |
f96637be | 92 | cifs_dbg(VFS, "%s: Could not init md5\n", __func__); |
307fbd31 SP |
93 | return rc; |
94 | } | |
95 | ||
14cae324 | 96 | rc = crypto_shash_update(&server->secmech.sdescmd5->shash, |
307fbd31 | 97 | server->session_key.response, server->session_key.len); |
14cae324 | 98 | if (rc) { |
f96637be | 99 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
14cae324 SP |
100 | return rc; |
101 | } | |
307fbd31 | 102 | |
50c2f753 | 103 | for (i = 0; i < n_vec; i++) { |
745542e2 JL |
104 | if (iov[i].iov_len == 0) |
105 | continue; | |
ffdd6e4d | 106 | if (iov[i].iov_base == NULL) { |
f96637be | 107 | cifs_dbg(VFS, "null iovec entry\n"); |
e9917a00 | 108 | return -EIO; |
745542e2 | 109 | } |
ffdd6e4d | 110 | /* The first entry includes a length field (which does not get |
e9917a00 | 111 | signed that occupies the first 4 bytes before the header */ |
ffdd6e4d | 112 | if (i == 0) { |
63d2583f | 113 | if (iov[0].iov_len <= 8) /* cmd field at offset 9 */ |
e9917a00 | 114 | break; /* nothing to sign or corrupt header */ |
14cae324 | 115 | rc = |
307fbd31 SP |
116 | crypto_shash_update(&server->secmech.sdescmd5->shash, |
117 | iov[i].iov_base + 4, iov[i].iov_len - 4); | |
14cae324 SP |
118 | } else { |
119 | rc = | |
307fbd31 SP |
120 | crypto_shash_update(&server->secmech.sdescmd5->shash, |
121 | iov[i].iov_base, iov[i].iov_len); | |
14cae324 SP |
122 | } |
123 | if (rc) { | |
f96637be JP |
124 | cifs_dbg(VFS, "%s: Could not update with payload\n", |
125 | __func__); | |
14cae324 SP |
126 | return rc; |
127 | } | |
e9917a00 | 128 | } |
84afc29b | 129 | |
fb308a6f JL |
130 | /* now hash over the rq_pages array */ |
131 | for (i = 0; i < rqst->rq_npages; i++) { | |
132 | struct kvec p_iov; | |
133 | ||
134 | cifs_rqst_page_to_kvec(rqst, i, &p_iov); | |
135 | crypto_shash_update(&server->secmech.sdescmd5->shash, | |
136 | p_iov.iov_base, p_iov.iov_len); | |
137 | kunmap(rqst->rq_pages[i]); | |
138 | } | |
139 | ||
307fbd31 | 140 | rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature); |
14cae324 | 141 | if (rc) |
f96637be | 142 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
84afc29b | 143 | |
307fbd31 | 144 | return rc; |
84afc29b SF |
145 | } |
146 | ||
a0f8b4fb | 147 | /* must be called with server->srv_mutex held */ |
bf5ea0e2 | 148 | int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server, |
63d2583f | 149 | __u32 *pexpected_response_sequence_number) |
84afc29b SF |
150 | { |
151 | int rc = 0; | |
152 | char smb_signature[20]; | |
bf5ea0e2 | 153 | struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
84afc29b | 154 | |
ffdd6e4d | 155 | if ((cifs_pdu == NULL) || (server == NULL)) |
84afc29b SF |
156 | return -EINVAL; |
157 | ||
998d6fcb JL |
158 | if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) || |
159 | server->tcpStatus == CifsNeedNegotiate) | |
84afc29b SF |
160 | return rc; |
161 | ||
998d6fcb | 162 | if (!server->session_estab) { |
b4dacbc2 | 163 | memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8); |
998d6fcb JL |
164 | return rc; |
165 | } | |
166 | ||
ffdd6e4d | 167 | cifs_pdu->Signature.Sequence.SequenceNumber = |
84afc29b | 168 | cpu_to_le32(server->sequence_number); |
ffdd6e4d | 169 | cifs_pdu->Signature.Sequence.Reserved = 0; |
84afc29b | 170 | |
0124cc45 JL |
171 | *pexpected_response_sequence_number = ++server->sequence_number; |
172 | ++server->sequence_number; | |
84afc29b | 173 | |
bf5ea0e2 | 174 | rc = cifs_calc_signature(rqst, server, smb_signature); |
ffdd6e4d SF |
175 | if (rc) |
176 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |
177 | else | |
178 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
84afc29b | 179 | |
ffdd6e4d | 180 | return rc; |
84afc29b SF |
181 | } |
182 | ||
bf5ea0e2 JL |
183 | int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server, |
184 | __u32 *pexpected_response_sequence) | |
185 | { | |
186 | struct smb_rqst rqst = { .rq_iov = iov, | |
187 | .rq_nvec = n_vec }; | |
188 | ||
189 | return cifs_sign_rqst(&rqst, server, pexpected_response_sequence); | |
190 | } | |
191 | ||
826a95e4 JL |
192 | /* must be called with server->srv_mutex held */ |
193 | int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server, | |
194 | __u32 *pexpected_response_sequence_number) | |
195 | { | |
196 | struct kvec iov; | |
197 | ||
198 | iov.iov_base = cifs_pdu; | |
199 | iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4; | |
200 | ||
762a4206 | 201 | return cifs_sign_smbv(&iov, 1, server, |
826a95e4 JL |
202 | pexpected_response_sequence_number); |
203 | } | |
204 | ||
bf5ea0e2 | 205 | int cifs_verify_signature(struct smb_rqst *rqst, |
21e73393 | 206 | struct TCP_Server_Info *server, |
ffdd6e4d | 207 | __u32 expected_sequence_number) |
1da177e4 | 208 | { |
c8e56f1f | 209 | unsigned int rc; |
1da177e4 LT |
210 | char server_response_sig[8]; |
211 | char what_we_think_sig_should_be[20]; | |
bf5ea0e2 | 212 | struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
1da177e4 | 213 | |
21e73393 | 214 | if (cifs_pdu == NULL || server == NULL) |
1da177e4 LT |
215 | return -EINVAL; |
216 | ||
9c4843ea | 217 | if (!server->session_estab) |
1da177e4 LT |
218 | return 0; |
219 | ||
220 | if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) { | |
50c2f753 | 221 | struct smb_com_lock_req *pSMB = |
ffdd6e4d SF |
222 | (struct smb_com_lock_req *)cifs_pdu; |
223 | if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) | |
1da177e4 LT |
224 | return 0; |
225 | } | |
226 | ||
50c2f753 SF |
227 | /* BB what if signatures are supposed to be on for session but |
228 | server does not send one? BB */ | |
229 | ||
1da177e4 | 230 | /* Do not need to verify session setups with signature "BSRSPYL " */ |
50c2f753 | 231 | if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0) |
f96637be JP |
232 | cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n", |
233 | cifs_pdu->Command); | |
1da177e4 LT |
234 | |
235 | /* save off the origiginal signature so we can modify the smb and check | |
236 | its signature against what the server sent */ | |
50c2f753 | 237 | memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8); |
1da177e4 | 238 | |
50c2f753 SF |
239 | cifs_pdu->Signature.Sequence.SequenceNumber = |
240 | cpu_to_le32(expected_sequence_number); | |
1da177e4 LT |
241 | cifs_pdu->Signature.Sequence.Reserved = 0; |
242 | ||
157c2491 | 243 | mutex_lock(&server->srv_mutex); |
bf5ea0e2 | 244 | rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be); |
157c2491 | 245 | mutex_unlock(&server->srv_mutex); |
1da177e4 | 246 | |
50c2f753 | 247 | if (rc) |
1da177e4 LT |
248 | return rc; |
249 | ||
50c2f753 SF |
250 | /* cifs_dump_mem("what we think it should be: ", |
251 | what_we_think_sig_should_be, 16); */ | |
1da177e4 | 252 | |
50c2f753 | 253 | if (memcmp(server_response_sig, what_we_think_sig_should_be, 8)) |
1da177e4 LT |
254 | return -EACCES; |
255 | else | |
256 | return 0; | |
257 | ||
258 | } | |
259 | ||
21e73393 | 260 | /* first calculate 24 bytes ntlm response and then 16 byte session key */ |
9ef5992e | 261 | int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp) |
1da177e4 | 262 | { |
ee2c9258 | 263 | int rc = 0; |
21e73393 SP |
264 | unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE; |
265 | char temp_key[CIFS_SESS_KEY_SIZE]; | |
266 | ||
267 | if (!ses) | |
1da177e4 LT |
268 | return -EINVAL; |
269 | ||
21e73393 | 270 | ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL); |
f96637be | 271 | if (!ses->auth_key.response) |
21e73393 | 272 | return -ENOMEM; |
f96637be | 273 | |
21e73393 SP |
274 | ses->auth_key.len = temp_len; |
275 | ||
ee2c9258 | 276 | rc = SMBNTencrypt(ses->password, ses->server->cryptkey, |
9ef5992e | 277 | ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp); |
ee2c9258 | 278 | if (rc) { |
f96637be JP |
279 | cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n", |
280 | __func__, rc); | |
ee2c9258 SP |
281 | return rc; |
282 | } | |
283 | ||
9ef5992e | 284 | rc = E_md4hash(ses->password, temp_key, nls_cp); |
ee2c9258 | 285 | if (rc) { |
f96637be JP |
286 | cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n", |
287 | __func__, rc); | |
ee2c9258 SP |
288 | return rc; |
289 | } | |
21e73393 | 290 | |
ee2c9258 SP |
291 | rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE); |
292 | if (rc) | |
f96637be JP |
293 | cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n", |
294 | __func__, rc); | |
21e73393 | 295 | |
ee2c9258 | 296 | return rc; |
1da177e4 LT |
297 | } |
298 | ||
7c7b25bc | 299 | #ifdef CONFIG_CIFS_WEAK_PW_HASH |
43988d76 | 300 | int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt, |
4e53a3fb | 301 | char *lnm_session_key) |
7c7b25bc SF |
302 | { |
303 | int i; | |
43988d76 | 304 | int rc; |
7c7b25bc SF |
305 | char password_with_pad[CIFS_ENCPWD_SIZE]; |
306 | ||
307 | memset(password_with_pad, 0, CIFS_ENCPWD_SIZE); | |
4e53a3fb JL |
308 | if (password) |
309 | strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE); | |
310 | ||
04912d6a | 311 | if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) { |
4e53a3fb JL |
312 | memcpy(lnm_session_key, password_with_pad, |
313 | CIFS_ENCPWD_SIZE); | |
43988d76 | 314 | return 0; |
4e53a3fb | 315 | } |
bdc4bf6e | 316 | |
7c7b25bc SF |
317 | /* calculate old style session key */ |
318 | /* calling toupper is less broken than repeatedly | |
319 | calling nls_toupper would be since that will never | |
320 | work for UTF8, but neither handles multibyte code pages | |
321 | but the only alternative would be converting to UCS-16 (Unicode) | |
322 | (using a routine something like UniStrupr) then | |
323 | uppercasing and then converting back from Unicode - which | |
324 | would only worth doing it if we knew it were utf8. Basically | |
325 | utf8 and other multibyte codepages each need their own strupper | |
326 | function since a byte at a time will ont work. */ | |
327 | ||
ef571cad | 328 | for (i = 0; i < CIFS_ENCPWD_SIZE; i++) |
7c7b25bc | 329 | password_with_pad[i] = toupper(password_with_pad[i]); |
7c7b25bc | 330 | |
43988d76 | 331 | rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key); |
4e53a3fb | 332 | |
43988d76 | 333 | return rc; |
7c7b25bc SF |
334 | } |
335 | #endif /* CIFS_WEAK_PW_HASH */ | |
336 | ||
9daa42e2 SP |
337 | /* Build a proper attribute value/target info pairs blob. |
338 | * Fill in netbios and dns domain name and workstation name | |
339 | * and client time (total five av pairs and + one end of fields indicator. | |
340 | * Allocate domain name which gets freed when session struct is deallocated. | |
2b149f11 SP |
341 | */ |
342 | static int | |
96daf2b0 | 343 | build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 | 344 | { |
9daa42e2 | 345 | unsigned int dlen; |
cfbd6f84 | 346 | unsigned int size = 2 * sizeof(struct ntlmssp2_name); |
9daa42e2 SP |
347 | char *defdmname = "WORKGROUP"; |
348 | unsigned char *blobptr; | |
2b149f11 SP |
349 | struct ntlmssp2_name *attrptr; |
350 | ||
9daa42e2 SP |
351 | if (!ses->domainName) { |
352 | ses->domainName = kstrdup(defdmname, GFP_KERNEL); | |
353 | if (!ses->domainName) | |
354 | return -ENOMEM; | |
355 | } | |
356 | ||
357 | dlen = strlen(ses->domainName); | |
9daa42e2 | 358 | |
cfbd6f84 SP |
359 | /* |
360 | * The length of this blob is two times the size of a | |
361 | * structure (av pair) which holds name/size | |
362 | * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) + | |
363 | * unicode length of a netbios domain name | |
9daa42e2 | 364 | */ |
cfbd6f84 | 365 | ses->auth_key.len = size + 2 * dlen; |
d3686d54 SP |
366 | ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL); |
367 | if (!ses->auth_key.response) { | |
368 | ses->auth_key.len = 0; | |
2b149f11 SP |
369 | return -ENOMEM; |
370 | } | |
9daa42e2 | 371 | |
d3686d54 | 372 | blobptr = ses->auth_key.response; |
9daa42e2 SP |
373 | attrptr = (struct ntlmssp2_name *) blobptr; |
374 | ||
cfbd6f84 SP |
375 | /* |
376 | * As defined in MS-NTLM 3.3.2, just this av pair field | |
377 | * is sufficient as part of the temp | |
378 | */ | |
9daa42e2 SP |
379 | attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME); |
380 | attrptr->length = cpu_to_le16(2 * dlen); | |
381 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
acbbb76a | 382 | cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp); |
9daa42e2 | 383 | |
2b149f11 SP |
384 | return 0; |
385 | } | |
386 | ||
387 | /* Server has provided av pairs/target info in the type 2 challenge | |
388 | * packet and we have plucked it and stored within smb session. | |
389 | * We parse that blob here to find netbios domain name to be used | |
390 | * as part of ntlmv2 authentication (in Target String), if not already | |
391 | * specified on the command line. | |
392 | * If this function returns without any error but without fetching | |
393 | * domain name, authentication may fail against some server but | |
394 | * may not fail against other (those who are not very particular | |
395 | * about target string i.e. for some, just user name might suffice. | |
396 | */ | |
397 | static int | |
96daf2b0 | 398 | find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 SP |
399 | { |
400 | unsigned int attrsize; | |
401 | unsigned int type; | |
402 | unsigned int onesize = sizeof(struct ntlmssp2_name); | |
403 | unsigned char *blobptr; | |
404 | unsigned char *blobend; | |
405 | struct ntlmssp2_name *attrptr; | |
406 | ||
d3686d54 | 407 | if (!ses->auth_key.len || !ses->auth_key.response) |
2b149f11 SP |
408 | return 0; |
409 | ||
d3686d54 SP |
410 | blobptr = ses->auth_key.response; |
411 | blobend = blobptr + ses->auth_key.len; | |
2b149f11 SP |
412 | |
413 | while (blobptr + onesize < blobend) { | |
414 | attrptr = (struct ntlmssp2_name *) blobptr; | |
415 | type = le16_to_cpu(attrptr->type); | |
416 | if (type == NTLMSSP_AV_EOL) | |
417 | break; | |
418 | blobptr += 2; /* advance attr type */ | |
419 | attrsize = le16_to_cpu(attrptr->length); | |
420 | blobptr += 2; /* advance attr size */ | |
421 | if (blobptr + attrsize > blobend) | |
422 | break; | |
423 | if (type == NTLMSSP_AV_NB_DOMAIN_NAME) { | |
424 | if (!attrsize) | |
425 | break; | |
426 | if (!ses->domainName) { | |
427 | ses->domainName = | |
428 | kmalloc(attrsize + 1, GFP_KERNEL); | |
429 | if (!ses->domainName) | |
430 | return -ENOMEM; | |
acbbb76a | 431 | cifs_from_utf16(ses->domainName, |
2b149f11 | 432 | (__le16 *)blobptr, attrsize, attrsize, |
f7c5445a | 433 | nls_cp, false); |
2b149f11 SP |
434 | break; |
435 | } | |
436 | } | |
437 | blobptr += attrsize; /* advance attr value */ | |
438 | } | |
439 | ||
440 | return 0; | |
441 | } | |
442 | ||
96daf2b0 | 443 | static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash, |
50c2f753 | 444 | const struct nls_table *nls_cp) |
a8ee0344 SF |
445 | { |
446 | int rc = 0; | |
447 | int len; | |
307fbd31 | 448 | char nt_hash[CIFS_NTHASH_SIZE]; |
fdf96a90 | 449 | __le16 *user; |
50c2f753 | 450 | wchar_t *domain; |
307fbd31 | 451 | wchar_t *server; |
a8ee0344 | 452 | |
307fbd31 | 453 | if (!ses->server->secmech.sdeschmacmd5) { |
f96637be | 454 | cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); |
307fbd31 SP |
455 | return -1; |
456 | } | |
56234e27 | 457 | |
c8e56f1f | 458 | /* calculate md4 hash of password */ |
9ef5992e | 459 | E_md4hash(ses->password, nt_hash, nls_cp); |
9fbc5908 | 460 | |
14cae324 | 461 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash, |
307fbd31 | 462 | CIFS_NTHASH_SIZE); |
14cae324 | 463 | if (rc) { |
f96637be | 464 | cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__); |
14cae324 SP |
465 | return rc; |
466 | } | |
307fbd31 SP |
467 | |
468 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
469 | if (rc) { | |
f96637be | 470 | cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__); |
307fbd31 SP |
471 | return rc; |
472 | } | |
a8ee0344 | 473 | |
fdf96a90 | 474 | /* convert ses->user_name to unicode */ |
04febabc | 475 | len = ses->user_name ? strlen(ses->user_name) : 0; |
1717ffc5 | 476 | user = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 477 | if (user == NULL) { |
307fbd31 | 478 | rc = -ENOMEM; |
14cae324 | 479 | return rc; |
307fbd31 | 480 | } |
04febabc JL |
481 | |
482 | if (len) { | |
fdf96a90 | 483 | len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp); |
04febabc JL |
484 | UniStrupr(user); |
485 | } else { | |
486 | memset(user, '\0', 2); | |
487 | } | |
307fbd31 | 488 | |
14cae324 | 489 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 | 490 | (char *)user, 2 * len); |
14cae324 SP |
491 | kfree(user); |
492 | if (rc) { | |
f96637be | 493 | cifs_dbg(VFS, "%s: Could not update with user\n", __func__); |
14cae324 SP |
494 | return rc; |
495 | } | |
a8ee0344 SF |
496 | |
497 | /* convert ses->domainName to unicode and uppercase */ | |
50c2f753 | 498 | if (ses->domainName) { |
1717ffc5 | 499 | len = strlen(ses->domainName); |
a8ee0344 | 500 | |
50c2f753 | 501 | domain = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 502 | if (domain == NULL) { |
307fbd31 | 503 | rc = -ENOMEM; |
14cae324 | 504 | return rc; |
307fbd31 | 505 | } |
acbbb76a SF |
506 | len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len, |
507 | nls_cp); | |
14cae324 | 508 | rc = |
307fbd31 SP |
509 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
510 | (char *)domain, 2 * len); | |
1717ffc5 | 511 | kfree(domain); |
14cae324 | 512 | if (rc) { |
f96637be JP |
513 | cifs_dbg(VFS, "%s: Could not update with domain\n", |
514 | __func__); | |
14cae324 SP |
515 | return rc; |
516 | } | |
307fbd31 SP |
517 | } else if (ses->serverName) { |
518 | len = strlen(ses->serverName); | |
519 | ||
520 | server = kmalloc(2 + (len * 2), GFP_KERNEL); | |
521 | if (server == NULL) { | |
307fbd31 | 522 | rc = -ENOMEM; |
14cae324 | 523 | return rc; |
307fbd31 | 524 | } |
acbbb76a | 525 | len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len, |
307fbd31 | 526 | nls_cp); |
14cae324 | 527 | rc = |
307fbd31 SP |
528 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
529 | (char *)server, 2 * len); | |
530 | kfree(server); | |
14cae324 | 531 | if (rc) { |
f96637be JP |
532 | cifs_dbg(VFS, "%s: Could not update with server\n", |
533 | __func__); | |
14cae324 SP |
534 | return rc; |
535 | } | |
1717ffc5 | 536 | } |
307fbd31 SP |
537 | |
538 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
d3686d54 | 539 | ntlmv2_hash); |
14cae324 | 540 | if (rc) |
f96637be | 541 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
307fbd31 | 542 | |
307fbd31 SP |
543 | return rc; |
544 | } | |
545 | ||
546 | static int | |
96daf2b0 | 547 | CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash) |
307fbd31 SP |
548 | { |
549 | int rc; | |
550 | unsigned int offset = CIFS_SESS_KEY_SIZE + 8; | |
551 | ||
552 | if (!ses->server->secmech.sdeschmacmd5) { | |
f96637be | 553 | cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); |
307fbd31 SP |
554 | return -1; |
555 | } | |
556 | ||
14cae324 | 557 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
d3686d54 | 558 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 559 | if (rc) { |
f96637be JP |
560 | cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", |
561 | __func__); | |
14cae324 SP |
562 | return rc; |
563 | } | |
307fbd31 SP |
564 | |
565 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
566 | if (rc) { | |
f96637be | 567 | cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__); |
307fbd31 SP |
568 | return rc; |
569 | } | |
570 | ||
3f618223 | 571 | if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) |
d3ba50b1 | 572 | memcpy(ses->auth_key.response + offset, |
d3686d54 | 573 | ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); |
d3ba50b1 SP |
574 | else |
575 | memcpy(ses->auth_key.response + offset, | |
576 | ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); | |
14cae324 | 577 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 | 578 | ses->auth_key.response + offset, ses->auth_key.len - offset); |
14cae324 | 579 | if (rc) { |
f96637be | 580 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
14cae324 SP |
581 | return rc; |
582 | } | |
307fbd31 SP |
583 | |
584 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
585 | ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
14cae324 | 586 | if (rc) |
f96637be | 587 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
9fbc5908 SF |
588 | |
589 | return rc; | |
590 | } | |
591 | ||
95dc8dd1 SF |
592 | static int crypto_hmacmd5_alloc(struct TCP_Server_Info *server) |
593 | { | |
594 | unsigned int size; | |
595 | ||
596 | /* check if already allocated */ | |
597 | if (server->secmech.sdeschmacmd5) | |
598 | return 0; | |
599 | ||
600 | server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0); | |
601 | if (IS_ERR(server->secmech.hmacmd5)) { | |
602 | cifs_dbg(VFS, "could not allocate crypto hmacmd5\n"); | |
603 | return PTR_ERR(server->secmech.hmacmd5); | |
604 | } | |
605 | ||
606 | size = sizeof(struct shash_desc) + | |
607 | crypto_shash_descsize(server->secmech.hmacmd5); | |
608 | server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL); | |
609 | if (!server->secmech.sdeschmacmd5) { | |
610 | crypto_free_shash(server->secmech.hmacmd5); | |
611 | server->secmech.hmacmd5 = NULL; | |
612 | return -ENOMEM; | |
613 | } | |
614 | server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5; | |
615 | server->secmech.sdeschmacmd5->shash.flags = 0x0; | |
616 | ||
617 | return 0; | |
618 | } | |
307fbd31 | 619 | |
2b149f11 | 620 | int |
96daf2b0 | 621 | setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp) |
9fbc5908 | 622 | { |
c8e56f1f | 623 | int rc; |
21e73393 | 624 | int baselen; |
d3686d54 | 625 | unsigned int tilen; |
21e73393 | 626 | struct ntlmv2_resp *buf; |
d3686d54 SP |
627 | char ntlmv2_hash[16]; |
628 | unsigned char *tiblob = NULL; /* target info blob */ | |
6d027cfd | 629 | |
3f618223 | 630 | if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) { |
2b149f11 | 631 | if (!ses->domainName) { |
f7c5445a | 632 | rc = find_domain_name(ses, nls_cp); |
2b149f11 | 633 | if (rc) { |
f96637be JP |
634 | cifs_dbg(VFS, "error %d finding domain name\n", |
635 | rc); | |
2b149f11 SP |
636 | goto setup_ntlmv2_rsp_ret; |
637 | } | |
638 | } | |
639 | } else { | |
9daa42e2 | 640 | rc = build_avpair_blob(ses, nls_cp); |
2b149f11 | 641 | if (rc) { |
f96637be | 642 | cifs_dbg(VFS, "error %d building av pair blob\n", rc); |
d3686d54 | 643 | goto setup_ntlmv2_rsp_ret; |
2b149f11 SP |
644 | } |
645 | } | |
a8ee0344 | 646 | |
21e73393 | 647 | baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp); |
d3686d54 SP |
648 | tilen = ses->auth_key.len; |
649 | tiblob = ses->auth_key.response; | |
650 | ||
651 | ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL); | |
21e73393 SP |
652 | if (!ses->auth_key.response) { |
653 | rc = ENOMEM; | |
d3686d54 | 654 | ses->auth_key.len = 0; |
21e73393 SP |
655 | goto setup_ntlmv2_rsp_ret; |
656 | } | |
d3686d54 | 657 | ses->auth_key.len += baselen; |
21e73393 SP |
658 | |
659 | buf = (struct ntlmv2_resp *) | |
660 | (ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
661 | buf->blob_signature = cpu_to_le32(0x00000101); | |
662 | buf->reserved = 0; | |
663 | buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME)); | |
664 | get_random_bytes(&buf->client_chal, sizeof(buf->client_chal)); | |
665 | buf->reserved2 = 0; | |
666 | ||
d3686d54 | 667 | memcpy(ses->auth_key.response + baselen, tiblob, tilen); |
21e73393 | 668 | |
95dc8dd1 SF |
669 | rc = crypto_hmacmd5_alloc(ses->server); |
670 | if (rc) { | |
671 | cifs_dbg(VFS, "could not crypto alloc hmacmd5 rc %d\n", rc); | |
672 | goto setup_ntlmv2_rsp_ret; | |
673 | } | |
674 | ||
f7c5445a | 675 | /* calculate ntlmv2_hash */ |
d3686d54 | 676 | rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp); |
2b149f11 | 677 | if (rc) { |
f96637be | 678 | cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc); |
2b149f11 SP |
679 | goto setup_ntlmv2_rsp_ret; |
680 | } | |
f7c5445a SP |
681 | |
682 | /* calculate first part of the client response (CR1) */ | |
d3686d54 | 683 | rc = CalcNTLMv2_response(ses, ntlmv2_hash); |
307fbd31 | 684 | if (rc) { |
f96637be | 685 | cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc); |
307fbd31 SP |
686 | goto setup_ntlmv2_rsp_ret; |
687 | } | |
b609f06a | 688 | |
5d0d2882 | 689 | /* now calculate the session key for NTLMv2 */ |
14cae324 | 690 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
d3686d54 | 691 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 692 | if (rc) { |
f96637be JP |
693 | cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", |
694 | __func__); | |
14cae324 SP |
695 | goto setup_ntlmv2_rsp_ret; |
696 | } | |
307fbd31 SP |
697 | |
698 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
699 | if (rc) { | |
f96637be | 700 | cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__); |
307fbd31 SP |
701 | goto setup_ntlmv2_rsp_ret; |
702 | } | |
703 | ||
14cae324 | 704 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 SP |
705 | ses->auth_key.response + CIFS_SESS_KEY_SIZE, |
706 | CIFS_HMAC_MD5_HASH_SIZE); | |
14cae324 | 707 | if (rc) { |
f96637be | 708 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
14cae324 SP |
709 | goto setup_ntlmv2_rsp_ret; |
710 | } | |
307fbd31 SP |
711 | |
712 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
713 | ses->auth_key.response); | |
14cae324 | 714 | if (rc) |
f96637be | 715 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
2b149f11 | 716 | |
2b149f11 | 717 | setup_ntlmv2_rsp_ret: |
d3686d54 | 718 | kfree(tiblob); |
2b149f11 SP |
719 | |
720 | return rc; | |
6d027cfd SF |
721 | } |
722 | ||
d2b91521 | 723 | int |
96daf2b0 | 724 | calc_seckey(struct cifs_ses *ses) |
d2b91521 SP |
725 | { |
726 | int rc; | |
727 | struct crypto_blkcipher *tfm_arc4; | |
728 | struct scatterlist sgin, sgout; | |
729 | struct blkcipher_desc desc; | |
730 | unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */ | |
731 | ||
732 | get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE); | |
733 | ||
734 | tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC); | |
7a8587e7 SP |
735 | if (IS_ERR(tfm_arc4)) { |
736 | rc = PTR_ERR(tfm_arc4); | |
f96637be | 737 | cifs_dbg(VFS, "could not allocate crypto API arc4\n"); |
7a8587e7 | 738 | return rc; |
d2b91521 SP |
739 | } |
740 | ||
741 | desc.tfm = tfm_arc4; | |
742 | ||
14cae324 | 743 | rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response, |
d2b91521 | 744 | CIFS_SESS_KEY_SIZE); |
14cae324 | 745 | if (rc) { |
f96637be JP |
746 | cifs_dbg(VFS, "%s: Could not set response as a key\n", |
747 | __func__); | |
14cae324 SP |
748 | return rc; |
749 | } | |
d2b91521 SP |
750 | |
751 | sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE); | |
d3686d54 | 752 | sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); |
d2b91521 SP |
753 | |
754 | rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE); | |
755 | if (rc) { | |
f96637be | 756 | cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc); |
d2b91521 SP |
757 | crypto_free_blkcipher(tfm_arc4); |
758 | return rc; | |
759 | } | |
760 | ||
761 | /* make secondary_key/nonce as session key */ | |
762 | memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE); | |
763 | /* and make len as that of session key only */ | |
764 | ses->auth_key.len = CIFS_SESS_KEY_SIZE; | |
765 | ||
766 | crypto_free_blkcipher(tfm_arc4); | |
767 | ||
14cae324 | 768 | return rc; |
d2b91521 SP |
769 | } |
770 | ||
771 | void | |
772 | cifs_crypto_shash_release(struct TCP_Server_Info *server) | |
773 | { | |
95dc8dd1 | 774 | if (server->secmech.cmacaes) { |
429b46f4 | 775 | crypto_free_shash(server->secmech.cmacaes); |
95dc8dd1 SF |
776 | server->secmech.cmacaes = NULL; |
777 | } | |
429b46f4 | 778 | |
95dc8dd1 | 779 | if (server->secmech.hmacsha256) { |
3c1bf7e4 | 780 | crypto_free_shash(server->secmech.hmacsha256); |
95dc8dd1 SF |
781 | server->secmech.hmacsha256 = NULL; |
782 | } | |
3c1bf7e4 | 783 | |
95dc8dd1 | 784 | if (server->secmech.md5) { |
d2b91521 | 785 | crypto_free_shash(server->secmech.md5); |
95dc8dd1 SF |
786 | server->secmech.md5 = NULL; |
787 | } | |
d2b91521 | 788 | |
95dc8dd1 | 789 | if (server->secmech.hmacmd5) { |
d2b91521 | 790 | crypto_free_shash(server->secmech.hmacmd5); |
95dc8dd1 SF |
791 | server->secmech.hmacmd5 = NULL; |
792 | } | |
d2b91521 | 793 | |
429b46f4 | 794 | kfree(server->secmech.sdesccmacaes); |
95dc8dd1 | 795 | server->secmech.sdesccmacaes = NULL; |
3c1bf7e4 | 796 | kfree(server->secmech.sdeschmacsha256); |
95dc8dd1 | 797 | server->secmech.sdeschmacsha256 = NULL; |
d2b91521 | 798 | kfree(server->secmech.sdeschmacmd5); |
95dc8dd1 | 799 | server->secmech.sdeschmacmd5 = NULL; |
d2b91521 | 800 | kfree(server->secmech.sdescmd5); |
95dc8dd1 | 801 | server->secmech.sdescmd5 = NULL; |
d2b91521 | 802 | } |