Commit | Line | Data |
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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"); | |
ba482029 JL |
46 | rc = PTR_ERR(server->secmech.md5); |
47 | server->secmech.md5 = NULL; | |
48 | return rc; | |
95dc8dd1 SF |
49 | } |
50 | ||
51 | size = sizeof(struct shash_desc) + | |
52 | crypto_shash_descsize(server->secmech.md5); | |
53 | server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL); | |
54 | if (!server->secmech.sdescmd5) { | |
95dc8dd1 SF |
55 | crypto_free_shash(server->secmech.md5); |
56 | server->secmech.md5 = NULL; | |
ba482029 | 57 | return -ENOMEM; |
95dc8dd1 SF |
58 | } |
59 | server->secmech.sdescmd5->shash.tfm = server->secmech.md5; | |
60 | server->secmech.sdescmd5->shash.flags = 0x0; | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
157c2491 JL |
65 | /* |
66 | * Calculate and return the CIFS signature based on the mac key and SMB PDU. | |
67 | * The 16 byte signature must be allocated by the caller. Note we only use the | |
68 | * 1st eight bytes and that the smb header signature field on input contains | |
69 | * the sequence number before this function is called. Also, this function | |
70 | * should be called with the server->srv_mutex held. | |
71 | */ | |
bf5ea0e2 | 72 | static int cifs_calc_signature(struct smb_rqst *rqst, |
826a95e4 | 73 | struct TCP_Server_Info *server, char *signature) |
84afc29b | 74 | { |
e9917a00 | 75 | int i; |
307fbd31 | 76 | int rc; |
bf5ea0e2 JL |
77 | struct kvec *iov = rqst->rq_iov; |
78 | int n_vec = rqst->rq_nvec; | |
84afc29b | 79 | |
21e73393 | 80 | if (iov == NULL || signature == NULL || server == NULL) |
e9917a00 | 81 | return -EINVAL; |
84afc29b | 82 | |
307fbd31 | 83 | if (!server->secmech.sdescmd5) { |
95dc8dd1 SF |
84 | rc = cifs_crypto_shash_md5_allocate(server); |
85 | if (rc) { | |
86 | cifs_dbg(VFS, "%s: Can't alloc md5 crypto\n", __func__); | |
87 | return -1; | |
88 | } | |
307fbd31 SP |
89 | } |
90 | ||
91 | rc = crypto_shash_init(&server->secmech.sdescmd5->shash); | |
92 | if (rc) { | |
f96637be | 93 | cifs_dbg(VFS, "%s: Could not init md5\n", __func__); |
307fbd31 SP |
94 | return rc; |
95 | } | |
96 | ||
14cae324 | 97 | rc = crypto_shash_update(&server->secmech.sdescmd5->shash, |
307fbd31 | 98 | server->session_key.response, server->session_key.len); |
14cae324 | 99 | if (rc) { |
f96637be | 100 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
14cae324 SP |
101 | return rc; |
102 | } | |
307fbd31 | 103 | |
50c2f753 | 104 | for (i = 0; i < n_vec; i++) { |
745542e2 JL |
105 | if (iov[i].iov_len == 0) |
106 | continue; | |
ffdd6e4d | 107 | if (iov[i].iov_base == NULL) { |
f96637be | 108 | cifs_dbg(VFS, "null iovec entry\n"); |
e9917a00 | 109 | return -EIO; |
745542e2 | 110 | } |
ffdd6e4d | 111 | /* The first entry includes a length field (which does not get |
e9917a00 | 112 | signed that occupies the first 4 bytes before the header */ |
ffdd6e4d | 113 | if (i == 0) { |
63d2583f | 114 | if (iov[0].iov_len <= 8) /* cmd field at offset 9 */ |
e9917a00 | 115 | break; /* nothing to sign or corrupt header */ |
14cae324 | 116 | rc = |
307fbd31 SP |
117 | crypto_shash_update(&server->secmech.sdescmd5->shash, |
118 | iov[i].iov_base + 4, iov[i].iov_len - 4); | |
14cae324 SP |
119 | } else { |
120 | rc = | |
307fbd31 SP |
121 | crypto_shash_update(&server->secmech.sdescmd5->shash, |
122 | iov[i].iov_base, iov[i].iov_len); | |
14cae324 SP |
123 | } |
124 | if (rc) { | |
f96637be JP |
125 | cifs_dbg(VFS, "%s: Could not update with payload\n", |
126 | __func__); | |
14cae324 SP |
127 | return rc; |
128 | } | |
e9917a00 | 129 | } |
84afc29b | 130 | |
fb308a6f JL |
131 | /* now hash over the rq_pages array */ |
132 | for (i = 0; i < rqst->rq_npages; i++) { | |
133 | struct kvec p_iov; | |
134 | ||
135 | cifs_rqst_page_to_kvec(rqst, i, &p_iov); | |
136 | crypto_shash_update(&server->secmech.sdescmd5->shash, | |
137 | p_iov.iov_base, p_iov.iov_len); | |
138 | kunmap(rqst->rq_pages[i]); | |
139 | } | |
140 | ||
307fbd31 | 141 | rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature); |
14cae324 | 142 | if (rc) |
f96637be | 143 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
84afc29b | 144 | |
307fbd31 | 145 | return rc; |
84afc29b SF |
146 | } |
147 | ||
a0f8b4fb | 148 | /* must be called with server->srv_mutex held */ |
bf5ea0e2 | 149 | int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server, |
63d2583f | 150 | __u32 *pexpected_response_sequence_number) |
84afc29b SF |
151 | { |
152 | int rc = 0; | |
153 | char smb_signature[20]; | |
bf5ea0e2 | 154 | struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
84afc29b | 155 | |
ffdd6e4d | 156 | if ((cifs_pdu == NULL) || (server == NULL)) |
84afc29b SF |
157 | return -EINVAL; |
158 | ||
998d6fcb JL |
159 | if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) || |
160 | server->tcpStatus == CifsNeedNegotiate) | |
84afc29b SF |
161 | return rc; |
162 | ||
998d6fcb | 163 | if (!server->session_estab) { |
b4dacbc2 | 164 | memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8); |
998d6fcb JL |
165 | return rc; |
166 | } | |
167 | ||
ffdd6e4d | 168 | cifs_pdu->Signature.Sequence.SequenceNumber = |
84afc29b | 169 | cpu_to_le32(server->sequence_number); |
ffdd6e4d | 170 | cifs_pdu->Signature.Sequence.Reserved = 0; |
84afc29b | 171 | |
0124cc45 JL |
172 | *pexpected_response_sequence_number = ++server->sequence_number; |
173 | ++server->sequence_number; | |
84afc29b | 174 | |
bf5ea0e2 | 175 | rc = cifs_calc_signature(rqst, server, smb_signature); |
ffdd6e4d SF |
176 | if (rc) |
177 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |
178 | else | |
179 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
84afc29b | 180 | |
ffdd6e4d | 181 | return rc; |
84afc29b SF |
182 | } |
183 | ||
bf5ea0e2 JL |
184 | int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server, |
185 | __u32 *pexpected_response_sequence) | |
186 | { | |
187 | struct smb_rqst rqst = { .rq_iov = iov, | |
188 | .rq_nvec = n_vec }; | |
189 | ||
190 | return cifs_sign_rqst(&rqst, server, pexpected_response_sequence); | |
191 | } | |
192 | ||
826a95e4 JL |
193 | /* must be called with server->srv_mutex held */ |
194 | int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server, | |
195 | __u32 *pexpected_response_sequence_number) | |
196 | { | |
197 | struct kvec iov; | |
198 | ||
199 | iov.iov_base = cifs_pdu; | |
200 | iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4; | |
201 | ||
762a4206 | 202 | return cifs_sign_smbv(&iov, 1, server, |
826a95e4 JL |
203 | pexpected_response_sequence_number); |
204 | } | |
205 | ||
bf5ea0e2 | 206 | int cifs_verify_signature(struct smb_rqst *rqst, |
21e73393 | 207 | struct TCP_Server_Info *server, |
ffdd6e4d | 208 | __u32 expected_sequence_number) |
1da177e4 | 209 | { |
c8e56f1f | 210 | unsigned int rc; |
1da177e4 LT |
211 | char server_response_sig[8]; |
212 | char what_we_think_sig_should_be[20]; | |
bf5ea0e2 | 213 | struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
1da177e4 | 214 | |
21e73393 | 215 | if (cifs_pdu == NULL || server == NULL) |
1da177e4 LT |
216 | return -EINVAL; |
217 | ||
9c4843ea | 218 | if (!server->session_estab) |
1da177e4 LT |
219 | return 0; |
220 | ||
221 | if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) { | |
50c2f753 | 222 | struct smb_com_lock_req *pSMB = |
ffdd6e4d SF |
223 | (struct smb_com_lock_req *)cifs_pdu; |
224 | if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) | |
1da177e4 LT |
225 | return 0; |
226 | } | |
227 | ||
50c2f753 SF |
228 | /* BB what if signatures are supposed to be on for session but |
229 | server does not send one? BB */ | |
230 | ||
1da177e4 | 231 | /* Do not need to verify session setups with signature "BSRSPYL " */ |
50c2f753 | 232 | if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0) |
f96637be JP |
233 | cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n", |
234 | cifs_pdu->Command); | |
1da177e4 LT |
235 | |
236 | /* save off the origiginal signature so we can modify the smb and check | |
237 | its signature against what the server sent */ | |
50c2f753 | 238 | memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8); |
1da177e4 | 239 | |
50c2f753 SF |
240 | cifs_pdu->Signature.Sequence.SequenceNumber = |
241 | cpu_to_le32(expected_sequence_number); | |
1da177e4 LT |
242 | cifs_pdu->Signature.Sequence.Reserved = 0; |
243 | ||
157c2491 | 244 | mutex_lock(&server->srv_mutex); |
bf5ea0e2 | 245 | rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be); |
157c2491 | 246 | mutex_unlock(&server->srv_mutex); |
1da177e4 | 247 | |
50c2f753 | 248 | if (rc) |
1da177e4 LT |
249 | return rc; |
250 | ||
50c2f753 SF |
251 | /* cifs_dump_mem("what we think it should be: ", |
252 | what_we_think_sig_should_be, 16); */ | |
1da177e4 | 253 | |
50c2f753 | 254 | if (memcmp(server_response_sig, what_we_think_sig_should_be, 8)) |
1da177e4 LT |
255 | return -EACCES; |
256 | else | |
257 | return 0; | |
258 | ||
259 | } | |
260 | ||
21e73393 | 261 | /* first calculate 24 bytes ntlm response and then 16 byte session key */ |
9ef5992e | 262 | int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp) |
1da177e4 | 263 | { |
ee2c9258 | 264 | int rc = 0; |
21e73393 SP |
265 | unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE; |
266 | char temp_key[CIFS_SESS_KEY_SIZE]; | |
267 | ||
268 | if (!ses) | |
1da177e4 LT |
269 | return -EINVAL; |
270 | ||
21e73393 | 271 | ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL); |
f96637be | 272 | if (!ses->auth_key.response) |
21e73393 | 273 | return -ENOMEM; |
f96637be | 274 | |
21e73393 SP |
275 | ses->auth_key.len = temp_len; |
276 | ||
ee2c9258 | 277 | rc = SMBNTencrypt(ses->password, ses->server->cryptkey, |
9ef5992e | 278 | ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp); |
ee2c9258 | 279 | if (rc) { |
f96637be JP |
280 | cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n", |
281 | __func__, rc); | |
ee2c9258 SP |
282 | return rc; |
283 | } | |
284 | ||
9ef5992e | 285 | rc = E_md4hash(ses->password, temp_key, nls_cp); |
ee2c9258 | 286 | if (rc) { |
f96637be JP |
287 | cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n", |
288 | __func__, rc); | |
ee2c9258 SP |
289 | return rc; |
290 | } | |
21e73393 | 291 | |
ee2c9258 SP |
292 | rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE); |
293 | if (rc) | |
f96637be JP |
294 | cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n", |
295 | __func__, rc); | |
21e73393 | 296 | |
ee2c9258 | 297 | return rc; |
1da177e4 LT |
298 | } |
299 | ||
7c7b25bc | 300 | #ifdef CONFIG_CIFS_WEAK_PW_HASH |
43988d76 | 301 | int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt, |
4e53a3fb | 302 | char *lnm_session_key) |
7c7b25bc SF |
303 | { |
304 | int i; | |
43988d76 | 305 | int rc; |
7c7b25bc SF |
306 | char password_with_pad[CIFS_ENCPWD_SIZE]; |
307 | ||
308 | memset(password_with_pad, 0, CIFS_ENCPWD_SIZE); | |
4e53a3fb JL |
309 | if (password) |
310 | strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE); | |
311 | ||
04912d6a | 312 | if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) { |
4e53a3fb JL |
313 | memcpy(lnm_session_key, password_with_pad, |
314 | CIFS_ENCPWD_SIZE); | |
43988d76 | 315 | return 0; |
4e53a3fb | 316 | } |
bdc4bf6e | 317 | |
7c7b25bc SF |
318 | /* calculate old style session key */ |
319 | /* calling toupper is less broken than repeatedly | |
320 | calling nls_toupper would be since that will never | |
321 | work for UTF8, but neither handles multibyte code pages | |
322 | but the only alternative would be converting to UCS-16 (Unicode) | |
323 | (using a routine something like UniStrupr) then | |
324 | uppercasing and then converting back from Unicode - which | |
325 | would only worth doing it if we knew it were utf8. Basically | |
326 | utf8 and other multibyte codepages each need their own strupper | |
327 | function since a byte at a time will ont work. */ | |
328 | ||
ef571cad | 329 | for (i = 0; i < CIFS_ENCPWD_SIZE; i++) |
7c7b25bc | 330 | password_with_pad[i] = toupper(password_with_pad[i]); |
7c7b25bc | 331 | |
43988d76 | 332 | rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key); |
4e53a3fb | 333 | |
43988d76 | 334 | return rc; |
7c7b25bc SF |
335 | } |
336 | #endif /* CIFS_WEAK_PW_HASH */ | |
337 | ||
9daa42e2 SP |
338 | /* Build a proper attribute value/target info pairs blob. |
339 | * Fill in netbios and dns domain name and workstation name | |
340 | * and client time (total five av pairs and + one end of fields indicator. | |
341 | * Allocate domain name which gets freed when session struct is deallocated. | |
2b149f11 SP |
342 | */ |
343 | static int | |
96daf2b0 | 344 | build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 | 345 | { |
9daa42e2 | 346 | unsigned int dlen; |
cfbd6f84 | 347 | unsigned int size = 2 * sizeof(struct ntlmssp2_name); |
9daa42e2 SP |
348 | char *defdmname = "WORKGROUP"; |
349 | unsigned char *blobptr; | |
2b149f11 SP |
350 | struct ntlmssp2_name *attrptr; |
351 | ||
9daa42e2 SP |
352 | if (!ses->domainName) { |
353 | ses->domainName = kstrdup(defdmname, GFP_KERNEL); | |
354 | if (!ses->domainName) | |
355 | return -ENOMEM; | |
356 | } | |
357 | ||
358 | dlen = strlen(ses->domainName); | |
9daa42e2 | 359 | |
cfbd6f84 SP |
360 | /* |
361 | * The length of this blob is two times the size of a | |
362 | * structure (av pair) which holds name/size | |
363 | * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) + | |
364 | * unicode length of a netbios domain name | |
9daa42e2 | 365 | */ |
cfbd6f84 | 366 | ses->auth_key.len = size + 2 * dlen; |
d3686d54 SP |
367 | ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL); |
368 | if (!ses->auth_key.response) { | |
369 | ses->auth_key.len = 0; | |
2b149f11 SP |
370 | return -ENOMEM; |
371 | } | |
9daa42e2 | 372 | |
d3686d54 | 373 | blobptr = ses->auth_key.response; |
9daa42e2 SP |
374 | attrptr = (struct ntlmssp2_name *) blobptr; |
375 | ||
cfbd6f84 SP |
376 | /* |
377 | * As defined in MS-NTLM 3.3.2, just this av pair field | |
378 | * is sufficient as part of the temp | |
379 | */ | |
9daa42e2 SP |
380 | attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME); |
381 | attrptr->length = cpu_to_le16(2 * dlen); | |
382 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
acbbb76a | 383 | cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp); |
9daa42e2 | 384 | |
2b149f11 SP |
385 | return 0; |
386 | } | |
387 | ||
388 | /* Server has provided av pairs/target info in the type 2 challenge | |
389 | * packet and we have plucked it and stored within smb session. | |
390 | * We parse that blob here to find netbios domain name to be used | |
391 | * as part of ntlmv2 authentication (in Target String), if not already | |
392 | * specified on the command line. | |
393 | * If this function returns without any error but without fetching | |
394 | * domain name, authentication may fail against some server but | |
395 | * may not fail against other (those who are not very particular | |
396 | * about target string i.e. for some, just user name might suffice. | |
397 | */ | |
398 | static int | |
96daf2b0 | 399 | find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 SP |
400 | { |
401 | unsigned int attrsize; | |
402 | unsigned int type; | |
403 | unsigned int onesize = sizeof(struct ntlmssp2_name); | |
404 | unsigned char *blobptr; | |
405 | unsigned char *blobend; | |
406 | struct ntlmssp2_name *attrptr; | |
407 | ||
d3686d54 | 408 | if (!ses->auth_key.len || !ses->auth_key.response) |
2b149f11 SP |
409 | return 0; |
410 | ||
d3686d54 SP |
411 | blobptr = ses->auth_key.response; |
412 | blobend = blobptr + ses->auth_key.len; | |
2b149f11 SP |
413 | |
414 | while (blobptr + onesize < blobend) { | |
415 | attrptr = (struct ntlmssp2_name *) blobptr; | |
416 | type = le16_to_cpu(attrptr->type); | |
417 | if (type == NTLMSSP_AV_EOL) | |
418 | break; | |
419 | blobptr += 2; /* advance attr type */ | |
420 | attrsize = le16_to_cpu(attrptr->length); | |
421 | blobptr += 2; /* advance attr size */ | |
422 | if (blobptr + attrsize > blobend) | |
423 | break; | |
424 | if (type == NTLMSSP_AV_NB_DOMAIN_NAME) { | |
057d6332 | 425 | if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN) |
2b149f11 SP |
426 | break; |
427 | if (!ses->domainName) { | |
428 | ses->domainName = | |
429 | kmalloc(attrsize + 1, GFP_KERNEL); | |
430 | if (!ses->domainName) | |
431 | return -ENOMEM; | |
acbbb76a | 432 | cifs_from_utf16(ses->domainName, |
2b149f11 | 433 | (__le16 *)blobptr, attrsize, attrsize, |
f7c5445a | 434 | nls_cp, false); |
2b149f11 SP |
435 | break; |
436 | } | |
437 | } | |
438 | blobptr += attrsize; /* advance attr value */ | |
439 | } | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
96daf2b0 | 444 | static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash, |
50c2f753 | 445 | const struct nls_table *nls_cp) |
a8ee0344 SF |
446 | { |
447 | int rc = 0; | |
448 | int len; | |
307fbd31 | 449 | char nt_hash[CIFS_NTHASH_SIZE]; |
fdf96a90 | 450 | __le16 *user; |
50c2f753 | 451 | wchar_t *domain; |
307fbd31 | 452 | wchar_t *server; |
a8ee0344 | 453 | |
307fbd31 | 454 | if (!ses->server->secmech.sdeschmacmd5) { |
f96637be | 455 | cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); |
307fbd31 SP |
456 | return -1; |
457 | } | |
56234e27 | 458 | |
c8e56f1f | 459 | /* calculate md4 hash of password */ |
9ef5992e | 460 | E_md4hash(ses->password, nt_hash, nls_cp); |
9fbc5908 | 461 | |
14cae324 | 462 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash, |
307fbd31 | 463 | CIFS_NTHASH_SIZE); |
14cae324 | 464 | if (rc) { |
f96637be | 465 | cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__); |
14cae324 SP |
466 | return rc; |
467 | } | |
307fbd31 SP |
468 | |
469 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
470 | if (rc) { | |
f96637be | 471 | cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__); |
307fbd31 SP |
472 | return rc; |
473 | } | |
a8ee0344 | 474 | |
fdf96a90 | 475 | /* convert ses->user_name to unicode */ |
04febabc | 476 | len = ses->user_name ? strlen(ses->user_name) : 0; |
1717ffc5 | 477 | user = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 478 | if (user == NULL) { |
307fbd31 | 479 | rc = -ENOMEM; |
14cae324 | 480 | return rc; |
307fbd31 | 481 | } |
04febabc JL |
482 | |
483 | if (len) { | |
fdf96a90 | 484 | len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp); |
04febabc JL |
485 | UniStrupr(user); |
486 | } else { | |
487 | memset(user, '\0', 2); | |
488 | } | |
307fbd31 | 489 | |
14cae324 | 490 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 | 491 | (char *)user, 2 * len); |
14cae324 SP |
492 | kfree(user); |
493 | if (rc) { | |
f96637be | 494 | cifs_dbg(VFS, "%s: Could not update with user\n", __func__); |
14cae324 SP |
495 | return rc; |
496 | } | |
a8ee0344 SF |
497 | |
498 | /* convert ses->domainName to unicode and uppercase */ | |
50c2f753 | 499 | if (ses->domainName) { |
1717ffc5 | 500 | len = strlen(ses->domainName); |
a8ee0344 | 501 | |
50c2f753 | 502 | domain = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 503 | if (domain == NULL) { |
307fbd31 | 504 | rc = -ENOMEM; |
14cae324 | 505 | return rc; |
307fbd31 | 506 | } |
acbbb76a SF |
507 | len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len, |
508 | nls_cp); | |
14cae324 | 509 | rc = |
307fbd31 SP |
510 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
511 | (char *)domain, 2 * len); | |
1717ffc5 | 512 | kfree(domain); |
14cae324 | 513 | if (rc) { |
f96637be JP |
514 | cifs_dbg(VFS, "%s: Could not update with domain\n", |
515 | __func__); | |
14cae324 SP |
516 | return rc; |
517 | } | |
307fbd31 SP |
518 | } else if (ses->serverName) { |
519 | len = strlen(ses->serverName); | |
520 | ||
521 | server = kmalloc(2 + (len * 2), GFP_KERNEL); | |
522 | if (server == NULL) { | |
307fbd31 | 523 | rc = -ENOMEM; |
14cae324 | 524 | return rc; |
307fbd31 | 525 | } |
acbbb76a | 526 | len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len, |
307fbd31 | 527 | nls_cp); |
14cae324 | 528 | rc = |
307fbd31 SP |
529 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
530 | (char *)server, 2 * len); | |
531 | kfree(server); | |
14cae324 | 532 | if (rc) { |
f96637be JP |
533 | cifs_dbg(VFS, "%s: Could not update with server\n", |
534 | __func__); | |
14cae324 SP |
535 | return rc; |
536 | } | |
1717ffc5 | 537 | } |
307fbd31 SP |
538 | |
539 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
d3686d54 | 540 | ntlmv2_hash); |
14cae324 | 541 | if (rc) |
f96637be | 542 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
307fbd31 | 543 | |
307fbd31 SP |
544 | return rc; |
545 | } | |
546 | ||
547 | static int | |
96daf2b0 | 548 | CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash) |
307fbd31 SP |
549 | { |
550 | int rc; | |
2c957ddf TG |
551 | struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *) |
552 | (ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
553 | unsigned int hash_len; | |
554 | ||
555 | /* The MD5 hash starts at challenge_key.key */ | |
556 | hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE + | |
557 | offsetof(struct ntlmv2_resp, challenge.key[0])); | |
307fbd31 SP |
558 | |
559 | if (!ses->server->secmech.sdeschmacmd5) { | |
f96637be | 560 | cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); |
307fbd31 SP |
561 | return -1; |
562 | } | |
563 | ||
14cae324 | 564 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
2c957ddf | 565 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 566 | if (rc) { |
f96637be JP |
567 | cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", |
568 | __func__); | |
14cae324 SP |
569 | return rc; |
570 | } | |
307fbd31 SP |
571 | |
572 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
573 | if (rc) { | |
f96637be | 574 | cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__); |
307fbd31 SP |
575 | return rc; |
576 | } | |
577 | ||
3f618223 | 578 | if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) |
2c957ddf TG |
579 | memcpy(ntlmv2->challenge.key, |
580 | ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); | |
d3ba50b1 | 581 | else |
2c957ddf TG |
582 | memcpy(ntlmv2->challenge.key, |
583 | ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); | |
14cae324 | 584 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
2c957ddf | 585 | ntlmv2->challenge.key, hash_len); |
14cae324 | 586 | if (rc) { |
f96637be | 587 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
14cae324 SP |
588 | return rc; |
589 | } | |
307fbd31 | 590 | |
2c957ddf | 591 | /* Note that the MD5 digest over writes anon.challenge_key.key */ |
307fbd31 | 592 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, |
2c957ddf | 593 | ntlmv2->ntlmv2_hash); |
14cae324 | 594 | if (rc) |
f96637be | 595 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
9fbc5908 SF |
596 | |
597 | return rc; | |
598 | } | |
599 | ||
95dc8dd1 SF |
600 | static int crypto_hmacmd5_alloc(struct TCP_Server_Info *server) |
601 | { | |
ba482029 | 602 | int rc; |
95dc8dd1 SF |
603 | unsigned int size; |
604 | ||
605 | /* check if already allocated */ | |
606 | if (server->secmech.sdeschmacmd5) | |
607 | return 0; | |
608 | ||
609 | server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0); | |
610 | if (IS_ERR(server->secmech.hmacmd5)) { | |
611 | cifs_dbg(VFS, "could not allocate crypto hmacmd5\n"); | |
ba482029 JL |
612 | rc = PTR_ERR(server->secmech.hmacmd5); |
613 | server->secmech.hmacmd5 = NULL; | |
614 | return rc; | |
95dc8dd1 SF |
615 | } |
616 | ||
617 | size = sizeof(struct shash_desc) + | |
618 | crypto_shash_descsize(server->secmech.hmacmd5); | |
619 | server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL); | |
620 | if (!server->secmech.sdeschmacmd5) { | |
621 | crypto_free_shash(server->secmech.hmacmd5); | |
622 | server->secmech.hmacmd5 = NULL; | |
623 | return -ENOMEM; | |
624 | } | |
625 | server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5; | |
626 | server->secmech.sdeschmacmd5->shash.flags = 0x0; | |
627 | ||
628 | return 0; | |
629 | } | |
307fbd31 | 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 */ | |
6d027cfd | 640 | |
3f618223 | 641 | if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) { |
2b149f11 | 642 | if (!ses->domainName) { |
f7c5445a | 643 | rc = find_domain_name(ses, nls_cp); |
2b149f11 | 644 | if (rc) { |
f96637be JP |
645 | cifs_dbg(VFS, "error %d finding domain name\n", |
646 | rc); | |
2b149f11 SP |
647 | goto setup_ntlmv2_rsp_ret; |
648 | } | |
649 | } | |
650 | } else { | |
9daa42e2 | 651 | rc = build_avpair_blob(ses, nls_cp); |
2b149f11 | 652 | if (rc) { |
f96637be | 653 | cifs_dbg(VFS, "error %d building av pair blob\n", rc); |
d3686d54 | 654 | goto setup_ntlmv2_rsp_ret; |
2b149f11 SP |
655 | } |
656 | } | |
a8ee0344 | 657 | |
21e73393 | 658 | baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp); |
d3686d54 SP |
659 | tilen = ses->auth_key.len; |
660 | tiblob = ses->auth_key.response; | |
661 | ||
662 | ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL); | |
21e73393 SP |
663 | if (!ses->auth_key.response) { |
664 | rc = ENOMEM; | |
d3686d54 | 665 | ses->auth_key.len = 0; |
21e73393 SP |
666 | goto setup_ntlmv2_rsp_ret; |
667 | } | |
d3686d54 | 668 | ses->auth_key.len += baselen; |
21e73393 | 669 | |
2c957ddf | 670 | ntlmv2 = (struct ntlmv2_resp *) |
21e73393 | 671 | (ses->auth_key.response + CIFS_SESS_KEY_SIZE); |
2c957ddf TG |
672 | ntlmv2->blob_signature = cpu_to_le32(0x00000101); |
673 | ntlmv2->reserved = 0; | |
674 | /* Must be within 5 minutes of the server */ | |
675 | ntlmv2->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME)); | |
676 | get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal)); | |
677 | ntlmv2->reserved2 = 0; | |
21e73393 | 678 | |
d3686d54 | 679 | memcpy(ses->auth_key.response + baselen, tiblob, tilen); |
21e73393 | 680 | |
95dc8dd1 SF |
681 | rc = crypto_hmacmd5_alloc(ses->server); |
682 | if (rc) { | |
683 | cifs_dbg(VFS, "could not crypto alloc hmacmd5 rc %d\n", rc); | |
684 | goto setup_ntlmv2_rsp_ret; | |
685 | } | |
686 | ||
f7c5445a | 687 | /* calculate ntlmv2_hash */ |
d3686d54 | 688 | rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp); |
2b149f11 | 689 | if (rc) { |
f96637be | 690 | cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc); |
2b149f11 SP |
691 | goto setup_ntlmv2_rsp_ret; |
692 | } | |
f7c5445a SP |
693 | |
694 | /* calculate first part of the client response (CR1) */ | |
d3686d54 | 695 | rc = CalcNTLMv2_response(ses, ntlmv2_hash); |
307fbd31 | 696 | if (rc) { |
f96637be | 697 | cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc); |
307fbd31 SP |
698 | goto setup_ntlmv2_rsp_ret; |
699 | } | |
b609f06a | 700 | |
5d0d2882 | 701 | /* now calculate the session key for NTLMv2 */ |
14cae324 | 702 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
d3686d54 | 703 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 704 | if (rc) { |
f96637be JP |
705 | cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", |
706 | __func__); | |
14cae324 SP |
707 | goto setup_ntlmv2_rsp_ret; |
708 | } | |
307fbd31 SP |
709 | |
710 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
711 | if (rc) { | |
f96637be | 712 | cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__); |
307fbd31 SP |
713 | goto setup_ntlmv2_rsp_ret; |
714 | } | |
715 | ||
14cae324 | 716 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
2c957ddf | 717 | ntlmv2->ntlmv2_hash, |
307fbd31 | 718 | CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 719 | if (rc) { |
f96637be | 720 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
14cae324 SP |
721 | goto setup_ntlmv2_rsp_ret; |
722 | } | |
307fbd31 SP |
723 | |
724 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
725 | ses->auth_key.response); | |
14cae324 | 726 | if (rc) |
f96637be | 727 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
2b149f11 | 728 | |
2b149f11 | 729 | setup_ntlmv2_rsp_ret: |
d3686d54 | 730 | kfree(tiblob); |
2b149f11 SP |
731 | |
732 | return rc; | |
6d027cfd SF |
733 | } |
734 | ||
d2b91521 | 735 | int |
96daf2b0 | 736 | calc_seckey(struct cifs_ses *ses) |
d2b91521 SP |
737 | { |
738 | int rc; | |
739 | struct crypto_blkcipher *tfm_arc4; | |
740 | struct scatterlist sgin, sgout; | |
741 | struct blkcipher_desc desc; | |
742 | unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */ | |
743 | ||
744 | get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE); | |
745 | ||
746 | tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC); | |
7a8587e7 SP |
747 | if (IS_ERR(tfm_arc4)) { |
748 | rc = PTR_ERR(tfm_arc4); | |
f96637be | 749 | cifs_dbg(VFS, "could not allocate crypto API arc4\n"); |
7a8587e7 | 750 | return rc; |
d2b91521 SP |
751 | } |
752 | ||
753 | desc.tfm = tfm_arc4; | |
754 | ||
14cae324 | 755 | rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response, |
d2b91521 | 756 | CIFS_SESS_KEY_SIZE); |
14cae324 | 757 | if (rc) { |
f96637be JP |
758 | cifs_dbg(VFS, "%s: Could not set response as a key\n", |
759 | __func__); | |
14cae324 SP |
760 | return rc; |
761 | } | |
d2b91521 SP |
762 | |
763 | sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE); | |
d3686d54 | 764 | sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); |
d2b91521 SP |
765 | |
766 | rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE); | |
767 | if (rc) { | |
f96637be | 768 | cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc); |
d2b91521 SP |
769 | crypto_free_blkcipher(tfm_arc4); |
770 | return rc; | |
771 | } | |
772 | ||
773 | /* make secondary_key/nonce as session key */ | |
774 | memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE); | |
775 | /* and make len as that of session key only */ | |
776 | ses->auth_key.len = CIFS_SESS_KEY_SIZE; | |
777 | ||
778 | crypto_free_blkcipher(tfm_arc4); | |
779 | ||
14cae324 | 780 | return rc; |
d2b91521 SP |
781 | } |
782 | ||
783 | void | |
784 | cifs_crypto_shash_release(struct TCP_Server_Info *server) | |
785 | { | |
95dc8dd1 | 786 | if (server->secmech.cmacaes) { |
429b46f4 | 787 | crypto_free_shash(server->secmech.cmacaes); |
95dc8dd1 SF |
788 | server->secmech.cmacaes = NULL; |
789 | } | |
429b46f4 | 790 | |
95dc8dd1 | 791 | if (server->secmech.hmacsha256) { |
3c1bf7e4 | 792 | crypto_free_shash(server->secmech.hmacsha256); |
95dc8dd1 SF |
793 | server->secmech.hmacsha256 = NULL; |
794 | } | |
3c1bf7e4 | 795 | |
95dc8dd1 | 796 | if (server->secmech.md5) { |
d2b91521 | 797 | crypto_free_shash(server->secmech.md5); |
95dc8dd1 SF |
798 | server->secmech.md5 = NULL; |
799 | } | |
d2b91521 | 800 | |
95dc8dd1 | 801 | if (server->secmech.hmacmd5) { |
d2b91521 | 802 | crypto_free_shash(server->secmech.hmacmd5); |
95dc8dd1 SF |
803 | server->secmech.hmacmd5 = NULL; |
804 | } | |
d2b91521 | 805 | |
429b46f4 | 806 | kfree(server->secmech.sdesccmacaes); |
95dc8dd1 | 807 | server->secmech.sdesccmacaes = NULL; |
3c1bf7e4 | 808 | kfree(server->secmech.sdeschmacsha256); |
95dc8dd1 | 809 | server->secmech.sdeschmacsha256 = NULL; |
d2b91521 | 810 | kfree(server->secmech.sdeschmacmd5); |
95dc8dd1 | 811 | server->secmech.sdeschmacmd5 = NULL; |
d2b91521 | 812 | kfree(server->secmech.sdescmd5); |
95dc8dd1 | 813 | server->secmech.sdescmd5 = NULL; |
d2b91521 | 814 | } |