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> |
1da177e4 | 37 | |
95dc8dd1 SF |
38 | static int |
39 | cifs_crypto_shash_md5_allocate(struct TCP_Server_Info *server) | |
40 | { | |
41 | int rc; | |
42 | unsigned int size; | |
43 | ||
44 | if (server->secmech.sdescmd5 != NULL) | |
45 | return 0; /* already allocated */ | |
46 | ||
47 | server->secmech.md5 = crypto_alloc_shash("md5", 0, 0); | |
48 | if (IS_ERR(server->secmech.md5)) { | |
49 | cifs_dbg(VFS, "could not allocate crypto md5\n"); | |
ba482029 JL |
50 | rc = PTR_ERR(server->secmech.md5); |
51 | server->secmech.md5 = NULL; | |
52 | return rc; | |
95dc8dd1 SF |
53 | } |
54 | ||
55 | size = sizeof(struct shash_desc) + | |
56 | crypto_shash_descsize(server->secmech.md5); | |
57 | server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL); | |
58 | if (!server->secmech.sdescmd5) { | |
95dc8dd1 SF |
59 | crypto_free_shash(server->secmech.md5); |
60 | server->secmech.md5 = NULL; | |
ba482029 | 61 | return -ENOMEM; |
95dc8dd1 SF |
62 | } |
63 | server->secmech.sdescmd5->shash.tfm = server->secmech.md5; | |
64 | server->secmech.sdescmd5->shash.flags = 0x0; | |
65 | ||
66 | return 0; | |
67 | } | |
68 | ||
157c2491 JL |
69 | /* |
70 | * Calculate and return the CIFS signature based on the mac key and SMB PDU. | |
71 | * The 16 byte signature must be allocated by the caller. Note we only use the | |
72 | * 1st eight bytes and that the smb header signature field on input contains | |
73 | * the sequence number before this function is called. Also, this function | |
74 | * should be called with the server->srv_mutex held. | |
75 | */ | |
bf5ea0e2 | 76 | static int cifs_calc_signature(struct smb_rqst *rqst, |
826a95e4 | 77 | struct TCP_Server_Info *server, char *signature) |
84afc29b | 78 | { |
e9917a00 | 79 | int i; |
307fbd31 | 80 | int rc; |
bf5ea0e2 JL |
81 | struct kvec *iov = rqst->rq_iov; |
82 | int n_vec = rqst->rq_nvec; | |
84afc29b | 83 | |
21e73393 | 84 | if (iov == NULL || signature == NULL || server == NULL) |
e9917a00 | 85 | return -EINVAL; |
84afc29b | 86 | |
307fbd31 | 87 | if (!server->secmech.sdescmd5) { |
95dc8dd1 SF |
88 | rc = cifs_crypto_shash_md5_allocate(server); |
89 | if (rc) { | |
90 | cifs_dbg(VFS, "%s: Can't alloc md5 crypto\n", __func__); | |
91 | return -1; | |
92 | } | |
307fbd31 SP |
93 | } |
94 | ||
95 | rc = crypto_shash_init(&server->secmech.sdescmd5->shash); | |
96 | if (rc) { | |
f96637be | 97 | cifs_dbg(VFS, "%s: Could not init md5\n", __func__); |
307fbd31 SP |
98 | return rc; |
99 | } | |
100 | ||
14cae324 | 101 | rc = crypto_shash_update(&server->secmech.sdescmd5->shash, |
307fbd31 | 102 | server->session_key.response, server->session_key.len); |
14cae324 | 103 | if (rc) { |
f96637be | 104 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
14cae324 SP |
105 | return rc; |
106 | } | |
307fbd31 | 107 | |
50c2f753 | 108 | for (i = 0; i < n_vec; i++) { |
745542e2 JL |
109 | if (iov[i].iov_len == 0) |
110 | continue; | |
ffdd6e4d | 111 | if (iov[i].iov_base == NULL) { |
f96637be | 112 | cifs_dbg(VFS, "null iovec entry\n"); |
e9917a00 | 113 | return -EIO; |
745542e2 | 114 | } |
ffdd6e4d | 115 | /* The first entry includes a length field (which does not get |
e9917a00 | 116 | signed that occupies the first 4 bytes before the header */ |
ffdd6e4d | 117 | if (i == 0) { |
63d2583f | 118 | if (iov[0].iov_len <= 8) /* cmd field at offset 9 */ |
e9917a00 | 119 | break; /* nothing to sign or corrupt header */ |
14cae324 | 120 | rc = |
307fbd31 SP |
121 | crypto_shash_update(&server->secmech.sdescmd5->shash, |
122 | iov[i].iov_base + 4, iov[i].iov_len - 4); | |
14cae324 SP |
123 | } else { |
124 | rc = | |
307fbd31 SP |
125 | crypto_shash_update(&server->secmech.sdescmd5->shash, |
126 | iov[i].iov_base, iov[i].iov_len); | |
14cae324 SP |
127 | } |
128 | if (rc) { | |
f96637be JP |
129 | cifs_dbg(VFS, "%s: Could not update with payload\n", |
130 | __func__); | |
14cae324 SP |
131 | return rc; |
132 | } | |
e9917a00 | 133 | } |
84afc29b | 134 | |
fb308a6f JL |
135 | /* now hash over the rq_pages array */ |
136 | for (i = 0; i < rqst->rq_npages; i++) { | |
137 | struct kvec p_iov; | |
138 | ||
139 | cifs_rqst_page_to_kvec(rqst, i, &p_iov); | |
140 | crypto_shash_update(&server->secmech.sdescmd5->shash, | |
141 | p_iov.iov_base, p_iov.iov_len); | |
142 | kunmap(rqst->rq_pages[i]); | |
143 | } | |
144 | ||
307fbd31 | 145 | rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature); |
14cae324 | 146 | if (rc) |
f96637be | 147 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
84afc29b | 148 | |
307fbd31 | 149 | return rc; |
84afc29b SF |
150 | } |
151 | ||
a0f8b4fb | 152 | /* must be called with server->srv_mutex held */ |
bf5ea0e2 | 153 | int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server, |
63d2583f | 154 | __u32 *pexpected_response_sequence_number) |
84afc29b SF |
155 | { |
156 | int rc = 0; | |
157 | char smb_signature[20]; | |
bf5ea0e2 | 158 | struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
84afc29b | 159 | |
ffdd6e4d | 160 | if ((cifs_pdu == NULL) || (server == NULL)) |
84afc29b SF |
161 | return -EINVAL; |
162 | ||
998d6fcb JL |
163 | if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) || |
164 | server->tcpStatus == CifsNeedNegotiate) | |
84afc29b SF |
165 | return rc; |
166 | ||
998d6fcb | 167 | if (!server->session_estab) { |
b4dacbc2 | 168 | memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8); |
998d6fcb JL |
169 | return rc; |
170 | } | |
171 | ||
ffdd6e4d | 172 | cifs_pdu->Signature.Sequence.SequenceNumber = |
84afc29b | 173 | cpu_to_le32(server->sequence_number); |
ffdd6e4d | 174 | cifs_pdu->Signature.Sequence.Reserved = 0; |
84afc29b | 175 | |
0124cc45 JL |
176 | *pexpected_response_sequence_number = ++server->sequence_number; |
177 | ++server->sequence_number; | |
84afc29b | 178 | |
bf5ea0e2 | 179 | rc = cifs_calc_signature(rqst, server, smb_signature); |
ffdd6e4d SF |
180 | if (rc) |
181 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |
182 | else | |
183 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
84afc29b | 184 | |
ffdd6e4d | 185 | return rc; |
84afc29b SF |
186 | } |
187 | ||
bf5ea0e2 JL |
188 | int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server, |
189 | __u32 *pexpected_response_sequence) | |
190 | { | |
191 | struct smb_rqst rqst = { .rq_iov = iov, | |
192 | .rq_nvec = n_vec }; | |
193 | ||
194 | return cifs_sign_rqst(&rqst, server, pexpected_response_sequence); | |
195 | } | |
196 | ||
826a95e4 JL |
197 | /* must be called with server->srv_mutex held */ |
198 | int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server, | |
199 | __u32 *pexpected_response_sequence_number) | |
200 | { | |
201 | struct kvec iov; | |
202 | ||
203 | iov.iov_base = cifs_pdu; | |
204 | iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4; | |
205 | ||
762a4206 | 206 | return cifs_sign_smbv(&iov, 1, server, |
826a95e4 JL |
207 | pexpected_response_sequence_number); |
208 | } | |
209 | ||
bf5ea0e2 | 210 | int cifs_verify_signature(struct smb_rqst *rqst, |
21e73393 | 211 | struct TCP_Server_Info *server, |
ffdd6e4d | 212 | __u32 expected_sequence_number) |
1da177e4 | 213 | { |
c8e56f1f | 214 | unsigned int rc; |
1da177e4 LT |
215 | char server_response_sig[8]; |
216 | char what_we_think_sig_should_be[20]; | |
bf5ea0e2 | 217 | struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
1da177e4 | 218 | |
21e73393 | 219 | if (cifs_pdu == NULL || server == NULL) |
1da177e4 LT |
220 | return -EINVAL; |
221 | ||
9c4843ea | 222 | if (!server->session_estab) |
1da177e4 LT |
223 | return 0; |
224 | ||
225 | if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) { | |
50c2f753 | 226 | struct smb_com_lock_req *pSMB = |
ffdd6e4d SF |
227 | (struct smb_com_lock_req *)cifs_pdu; |
228 | if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) | |
1da177e4 LT |
229 | return 0; |
230 | } | |
231 | ||
50c2f753 SF |
232 | /* BB what if signatures are supposed to be on for session but |
233 | server does not send one? BB */ | |
234 | ||
1da177e4 | 235 | /* Do not need to verify session setups with signature "BSRSPYL " */ |
50c2f753 | 236 | if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0) |
f96637be JP |
237 | cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n", |
238 | cifs_pdu->Command); | |
1da177e4 LT |
239 | |
240 | /* save off the origiginal signature so we can modify the smb and check | |
241 | its signature against what the server sent */ | |
50c2f753 | 242 | memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8); |
1da177e4 | 243 | |
50c2f753 SF |
244 | cifs_pdu->Signature.Sequence.SequenceNumber = |
245 | cpu_to_le32(expected_sequence_number); | |
1da177e4 LT |
246 | cifs_pdu->Signature.Sequence.Reserved = 0; |
247 | ||
157c2491 | 248 | mutex_lock(&server->srv_mutex); |
bf5ea0e2 | 249 | rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be); |
157c2491 | 250 | mutex_unlock(&server->srv_mutex); |
1da177e4 | 251 | |
50c2f753 | 252 | if (rc) |
1da177e4 LT |
253 | return rc; |
254 | ||
50c2f753 SF |
255 | /* cifs_dump_mem("what we think it should be: ", |
256 | what_we_think_sig_should_be, 16); */ | |
1da177e4 | 257 | |
50c2f753 | 258 | if (memcmp(server_response_sig, what_we_think_sig_should_be, 8)) |
1da177e4 LT |
259 | return -EACCES; |
260 | else | |
261 | return 0; | |
262 | ||
263 | } | |
264 | ||
21e73393 | 265 | /* first calculate 24 bytes ntlm response and then 16 byte session key */ |
9ef5992e | 266 | int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp) |
1da177e4 | 267 | { |
ee2c9258 | 268 | int rc = 0; |
21e73393 SP |
269 | unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE; |
270 | char temp_key[CIFS_SESS_KEY_SIZE]; | |
271 | ||
272 | if (!ses) | |
1da177e4 LT |
273 | return -EINVAL; |
274 | ||
21e73393 | 275 | ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL); |
f96637be | 276 | if (!ses->auth_key.response) |
21e73393 | 277 | return -ENOMEM; |
f96637be | 278 | |
21e73393 SP |
279 | ses->auth_key.len = temp_len; |
280 | ||
ee2c9258 | 281 | rc = SMBNTencrypt(ses->password, ses->server->cryptkey, |
9ef5992e | 282 | ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp); |
ee2c9258 | 283 | if (rc) { |
f96637be JP |
284 | cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n", |
285 | __func__, rc); | |
ee2c9258 SP |
286 | return rc; |
287 | } | |
288 | ||
9ef5992e | 289 | rc = E_md4hash(ses->password, temp_key, nls_cp); |
ee2c9258 | 290 | if (rc) { |
f96637be JP |
291 | cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n", |
292 | __func__, rc); | |
ee2c9258 SP |
293 | return rc; |
294 | } | |
21e73393 | 295 | |
ee2c9258 SP |
296 | rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE); |
297 | if (rc) | |
f96637be JP |
298 | cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n", |
299 | __func__, rc); | |
21e73393 | 300 | |
ee2c9258 | 301 | return rc; |
1da177e4 LT |
302 | } |
303 | ||
7c7b25bc | 304 | #ifdef CONFIG_CIFS_WEAK_PW_HASH |
43988d76 | 305 | int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt, |
4e53a3fb | 306 | char *lnm_session_key) |
7c7b25bc SF |
307 | { |
308 | int i; | |
43988d76 | 309 | int rc; |
7c7b25bc SF |
310 | char password_with_pad[CIFS_ENCPWD_SIZE]; |
311 | ||
312 | memset(password_with_pad, 0, CIFS_ENCPWD_SIZE); | |
4e53a3fb JL |
313 | if (password) |
314 | strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE); | |
315 | ||
04912d6a | 316 | if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) { |
4e53a3fb JL |
317 | memcpy(lnm_session_key, password_with_pad, |
318 | CIFS_ENCPWD_SIZE); | |
43988d76 | 319 | return 0; |
4e53a3fb | 320 | } |
bdc4bf6e | 321 | |
7c7b25bc SF |
322 | /* calculate old style session key */ |
323 | /* calling toupper is less broken than repeatedly | |
324 | calling nls_toupper would be since that will never | |
325 | work for UTF8, but neither handles multibyte code pages | |
326 | but the only alternative would be converting to UCS-16 (Unicode) | |
327 | (using a routine something like UniStrupr) then | |
328 | uppercasing and then converting back from Unicode - which | |
329 | would only worth doing it if we knew it were utf8. Basically | |
330 | utf8 and other multibyte codepages each need their own strupper | |
331 | function since a byte at a time will ont work. */ | |
332 | ||
ef571cad | 333 | for (i = 0; i < CIFS_ENCPWD_SIZE; i++) |
7c7b25bc | 334 | password_with_pad[i] = toupper(password_with_pad[i]); |
7c7b25bc | 335 | |
43988d76 | 336 | rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key); |
4e53a3fb | 337 | |
43988d76 | 338 | return rc; |
7c7b25bc SF |
339 | } |
340 | #endif /* CIFS_WEAK_PW_HASH */ | |
341 | ||
9daa42e2 SP |
342 | /* Build a proper attribute value/target info pairs blob. |
343 | * Fill in netbios and dns domain name and workstation name | |
344 | * and client time (total five av pairs and + one end of fields indicator. | |
345 | * Allocate domain name which gets freed when session struct is deallocated. | |
2b149f11 SP |
346 | */ |
347 | static int | |
96daf2b0 | 348 | build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 | 349 | { |
9daa42e2 | 350 | unsigned int dlen; |
cfbd6f84 | 351 | unsigned int size = 2 * sizeof(struct ntlmssp2_name); |
9daa42e2 SP |
352 | char *defdmname = "WORKGROUP"; |
353 | unsigned char *blobptr; | |
2b149f11 SP |
354 | struct ntlmssp2_name *attrptr; |
355 | ||
9daa42e2 SP |
356 | if (!ses->domainName) { |
357 | ses->domainName = kstrdup(defdmname, GFP_KERNEL); | |
358 | if (!ses->domainName) | |
359 | return -ENOMEM; | |
360 | } | |
361 | ||
362 | dlen = strlen(ses->domainName); | |
9daa42e2 | 363 | |
cfbd6f84 SP |
364 | /* |
365 | * The length of this blob is two times the size of a | |
366 | * structure (av pair) which holds name/size | |
367 | * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) + | |
368 | * unicode length of a netbios domain name | |
9daa42e2 | 369 | */ |
cfbd6f84 | 370 | ses->auth_key.len = size + 2 * dlen; |
d3686d54 SP |
371 | ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL); |
372 | if (!ses->auth_key.response) { | |
373 | ses->auth_key.len = 0; | |
2b149f11 SP |
374 | return -ENOMEM; |
375 | } | |
9daa42e2 | 376 | |
d3686d54 | 377 | blobptr = ses->auth_key.response; |
9daa42e2 SP |
378 | attrptr = (struct ntlmssp2_name *) blobptr; |
379 | ||
cfbd6f84 SP |
380 | /* |
381 | * As defined in MS-NTLM 3.3.2, just this av pair field | |
382 | * is sufficient as part of the temp | |
383 | */ | |
9daa42e2 SP |
384 | attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME); |
385 | attrptr->length = cpu_to_le16(2 * dlen); | |
386 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
acbbb76a | 387 | cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp); |
9daa42e2 | 388 | |
2b149f11 SP |
389 | return 0; |
390 | } | |
391 | ||
392 | /* Server has provided av pairs/target info in the type 2 challenge | |
393 | * packet and we have plucked it and stored within smb session. | |
394 | * We parse that blob here to find netbios domain name to be used | |
395 | * as part of ntlmv2 authentication (in Target String), if not already | |
396 | * specified on the command line. | |
397 | * If this function returns without any error but without fetching | |
398 | * domain name, authentication may fail against some server but | |
399 | * may not fail against other (those who are not very particular | |
400 | * about target string i.e. for some, just user name might suffice. | |
401 | */ | |
402 | static int | |
96daf2b0 | 403 | find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 SP |
404 | { |
405 | unsigned int attrsize; | |
406 | unsigned int type; | |
407 | unsigned int onesize = sizeof(struct ntlmssp2_name); | |
408 | unsigned char *blobptr; | |
409 | unsigned char *blobend; | |
410 | struct ntlmssp2_name *attrptr; | |
411 | ||
d3686d54 | 412 | if (!ses->auth_key.len || !ses->auth_key.response) |
2b149f11 SP |
413 | return 0; |
414 | ||
d3686d54 SP |
415 | blobptr = ses->auth_key.response; |
416 | blobend = blobptr + ses->auth_key.len; | |
2b149f11 SP |
417 | |
418 | while (blobptr + onesize < blobend) { | |
419 | attrptr = (struct ntlmssp2_name *) blobptr; | |
420 | type = le16_to_cpu(attrptr->type); | |
421 | if (type == NTLMSSP_AV_EOL) | |
422 | break; | |
423 | blobptr += 2; /* advance attr type */ | |
424 | attrsize = le16_to_cpu(attrptr->length); | |
425 | blobptr += 2; /* advance attr size */ | |
426 | if (blobptr + attrsize > blobend) | |
427 | break; | |
428 | if (type == NTLMSSP_AV_NB_DOMAIN_NAME) { | |
057d6332 | 429 | if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN) |
2b149f11 SP |
430 | break; |
431 | if (!ses->domainName) { | |
432 | ses->domainName = | |
433 | kmalloc(attrsize + 1, GFP_KERNEL); | |
434 | if (!ses->domainName) | |
435 | return -ENOMEM; | |
acbbb76a | 436 | cifs_from_utf16(ses->domainName, |
2b149f11 | 437 | (__le16 *)blobptr, attrsize, attrsize, |
b693855f | 438 | nls_cp, NO_MAP_UNI_RSVD); |
2b149f11 SP |
439 | break; |
440 | } | |
441 | } | |
442 | blobptr += attrsize; /* advance attr value */ | |
443 | } | |
444 | ||
445 | return 0; | |
446 | } | |
447 | ||
98ce94c8 PS |
448 | /* Server has provided av pairs/target info in the type 2 challenge |
449 | * packet and we have plucked it and stored within smb session. | |
450 | * We parse that blob here to find the server given timestamp | |
451 | * as part of ntlmv2 authentication (or local current time as | |
452 | * default in case of failure) | |
453 | */ | |
454 | static __le64 | |
455 | find_timestamp(struct cifs_ses *ses) | |
456 | { | |
457 | unsigned int attrsize; | |
458 | unsigned int type; | |
459 | unsigned int onesize = sizeof(struct ntlmssp2_name); | |
460 | unsigned char *blobptr; | |
461 | unsigned char *blobend; | |
462 | struct ntlmssp2_name *attrptr; | |
463 | ||
464 | if (!ses->auth_key.len || !ses->auth_key.response) | |
465 | return 0; | |
466 | ||
467 | blobptr = ses->auth_key.response; | |
468 | blobend = blobptr + ses->auth_key.len; | |
469 | ||
470 | while (blobptr + onesize < blobend) { | |
471 | attrptr = (struct ntlmssp2_name *) blobptr; | |
472 | type = le16_to_cpu(attrptr->type); | |
473 | if (type == NTLMSSP_AV_EOL) | |
474 | break; | |
475 | blobptr += 2; /* advance attr type */ | |
476 | attrsize = le16_to_cpu(attrptr->length); | |
477 | blobptr += 2; /* advance attr size */ | |
478 | if (blobptr + attrsize > blobend) | |
479 | break; | |
480 | if (type == NTLMSSP_AV_TIMESTAMP) { | |
481 | if (attrsize == sizeof(u64)) | |
482 | return *((__le64 *)blobptr); | |
483 | } | |
484 | blobptr += attrsize; /* advance attr value */ | |
485 | } | |
486 | ||
487 | return cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME)); | |
488 | } | |
489 | ||
96daf2b0 | 490 | static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash, |
50c2f753 | 491 | const struct nls_table *nls_cp) |
a8ee0344 SF |
492 | { |
493 | int rc = 0; | |
494 | int len; | |
307fbd31 | 495 | char nt_hash[CIFS_NTHASH_SIZE]; |
fdf96a90 | 496 | __le16 *user; |
50c2f753 | 497 | wchar_t *domain; |
307fbd31 | 498 | wchar_t *server; |
a8ee0344 | 499 | |
307fbd31 | 500 | if (!ses->server->secmech.sdeschmacmd5) { |
f96637be | 501 | cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); |
307fbd31 SP |
502 | return -1; |
503 | } | |
56234e27 | 504 | |
c8e56f1f | 505 | /* calculate md4 hash of password */ |
9ef5992e | 506 | E_md4hash(ses->password, nt_hash, nls_cp); |
9fbc5908 | 507 | |
14cae324 | 508 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash, |
307fbd31 | 509 | CIFS_NTHASH_SIZE); |
14cae324 | 510 | if (rc) { |
f96637be | 511 | cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__); |
14cae324 SP |
512 | return rc; |
513 | } | |
307fbd31 SP |
514 | |
515 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
516 | if (rc) { | |
f96637be | 517 | cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__); |
307fbd31 SP |
518 | return rc; |
519 | } | |
a8ee0344 | 520 | |
fdf96a90 | 521 | /* convert ses->user_name to unicode */ |
04febabc | 522 | len = ses->user_name ? strlen(ses->user_name) : 0; |
1717ffc5 | 523 | user = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 524 | if (user == NULL) { |
307fbd31 | 525 | rc = -ENOMEM; |
14cae324 | 526 | return rc; |
307fbd31 | 527 | } |
04febabc JL |
528 | |
529 | if (len) { | |
fdf96a90 | 530 | len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp); |
04febabc JL |
531 | UniStrupr(user); |
532 | } else { | |
533 | memset(user, '\0', 2); | |
534 | } | |
307fbd31 | 535 | |
14cae324 | 536 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 | 537 | (char *)user, 2 * len); |
14cae324 SP |
538 | kfree(user); |
539 | if (rc) { | |
f96637be | 540 | cifs_dbg(VFS, "%s: Could not update with user\n", __func__); |
14cae324 SP |
541 | return rc; |
542 | } | |
a8ee0344 SF |
543 | |
544 | /* convert ses->domainName to unicode and uppercase */ | |
50c2f753 | 545 | if (ses->domainName) { |
1717ffc5 | 546 | len = strlen(ses->domainName); |
a8ee0344 | 547 | |
50c2f753 | 548 | domain = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 549 | if (domain == NULL) { |
307fbd31 | 550 | rc = -ENOMEM; |
14cae324 | 551 | return rc; |
307fbd31 | 552 | } |
acbbb76a SF |
553 | len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len, |
554 | nls_cp); | |
14cae324 | 555 | rc = |
307fbd31 SP |
556 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
557 | (char *)domain, 2 * len); | |
1717ffc5 | 558 | kfree(domain); |
14cae324 | 559 | if (rc) { |
f96637be JP |
560 | cifs_dbg(VFS, "%s: Could not update with domain\n", |
561 | __func__); | |
14cae324 SP |
562 | return rc; |
563 | } | |
8b7a4544 SF |
564 | } else { |
565 | /* We use ses->serverName if no domain name available */ | |
307fbd31 SP |
566 | len = strlen(ses->serverName); |
567 | ||
568 | server = kmalloc(2 + (len * 2), GFP_KERNEL); | |
569 | if (server == NULL) { | |
307fbd31 | 570 | rc = -ENOMEM; |
14cae324 | 571 | return rc; |
307fbd31 | 572 | } |
acbbb76a | 573 | len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len, |
307fbd31 | 574 | nls_cp); |
14cae324 | 575 | rc = |
307fbd31 SP |
576 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
577 | (char *)server, 2 * len); | |
578 | kfree(server); | |
14cae324 | 579 | if (rc) { |
f96637be JP |
580 | cifs_dbg(VFS, "%s: Could not update with server\n", |
581 | __func__); | |
14cae324 SP |
582 | return rc; |
583 | } | |
1717ffc5 | 584 | } |
307fbd31 SP |
585 | |
586 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
d3686d54 | 587 | ntlmv2_hash); |
14cae324 | 588 | if (rc) |
f96637be | 589 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
307fbd31 | 590 | |
307fbd31 SP |
591 | return rc; |
592 | } | |
593 | ||
594 | static int | |
96daf2b0 | 595 | CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash) |
307fbd31 SP |
596 | { |
597 | int rc; | |
2c957ddf TG |
598 | struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *) |
599 | (ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
600 | unsigned int hash_len; | |
601 | ||
602 | /* The MD5 hash starts at challenge_key.key */ | |
603 | hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE + | |
604 | offsetof(struct ntlmv2_resp, challenge.key[0])); | |
307fbd31 SP |
605 | |
606 | if (!ses->server->secmech.sdeschmacmd5) { | |
f96637be | 607 | cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); |
307fbd31 SP |
608 | return -1; |
609 | } | |
610 | ||
14cae324 | 611 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
2c957ddf | 612 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 613 | if (rc) { |
f96637be JP |
614 | cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", |
615 | __func__); | |
14cae324 SP |
616 | return rc; |
617 | } | |
307fbd31 SP |
618 | |
619 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
620 | if (rc) { | |
f96637be | 621 | cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__); |
307fbd31 SP |
622 | return rc; |
623 | } | |
624 | ||
3f618223 | 625 | if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) |
2c957ddf TG |
626 | memcpy(ntlmv2->challenge.key, |
627 | ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); | |
d3ba50b1 | 628 | else |
2c957ddf TG |
629 | memcpy(ntlmv2->challenge.key, |
630 | ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); | |
14cae324 | 631 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
2c957ddf | 632 | ntlmv2->challenge.key, hash_len); |
14cae324 | 633 | if (rc) { |
f96637be | 634 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
14cae324 SP |
635 | return rc; |
636 | } | |
307fbd31 | 637 | |
2c957ddf | 638 | /* Note that the MD5 digest over writes anon.challenge_key.key */ |
307fbd31 | 639 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, |
2c957ddf | 640 | ntlmv2->ntlmv2_hash); |
14cae324 | 641 | if (rc) |
f96637be | 642 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
9fbc5908 SF |
643 | |
644 | return rc; | |
645 | } | |
646 | ||
95dc8dd1 SF |
647 | static int crypto_hmacmd5_alloc(struct TCP_Server_Info *server) |
648 | { | |
ba482029 | 649 | int rc; |
95dc8dd1 SF |
650 | unsigned int size; |
651 | ||
652 | /* check if already allocated */ | |
653 | if (server->secmech.sdeschmacmd5) | |
654 | return 0; | |
655 | ||
656 | server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0); | |
657 | if (IS_ERR(server->secmech.hmacmd5)) { | |
658 | cifs_dbg(VFS, "could not allocate crypto hmacmd5\n"); | |
ba482029 JL |
659 | rc = PTR_ERR(server->secmech.hmacmd5); |
660 | server->secmech.hmacmd5 = NULL; | |
661 | return rc; | |
95dc8dd1 SF |
662 | } |
663 | ||
664 | size = sizeof(struct shash_desc) + | |
665 | crypto_shash_descsize(server->secmech.hmacmd5); | |
666 | server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL); | |
667 | if (!server->secmech.sdeschmacmd5) { | |
668 | crypto_free_shash(server->secmech.hmacmd5); | |
669 | server->secmech.hmacmd5 = NULL; | |
670 | return -ENOMEM; | |
671 | } | |
672 | server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5; | |
673 | server->secmech.sdeschmacmd5->shash.flags = 0x0; | |
674 | ||
675 | return 0; | |
676 | } | |
307fbd31 | 677 | |
2b149f11 | 678 | int |
96daf2b0 | 679 | setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp) |
9fbc5908 | 680 | { |
c8e56f1f | 681 | int rc; |
21e73393 | 682 | int baselen; |
d3686d54 | 683 | unsigned int tilen; |
2c957ddf | 684 | struct ntlmv2_resp *ntlmv2; |
d3686d54 SP |
685 | char ntlmv2_hash[16]; |
686 | unsigned char *tiblob = NULL; /* target info blob */ | |
98ce94c8 | 687 | __le64 rsp_timestamp; |
6d027cfd | 688 | |
3f618223 | 689 | if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) { |
2b149f11 | 690 | if (!ses->domainName) { |
f7c5445a | 691 | rc = find_domain_name(ses, nls_cp); |
2b149f11 | 692 | if (rc) { |
f96637be JP |
693 | cifs_dbg(VFS, "error %d finding domain name\n", |
694 | rc); | |
2b149f11 SP |
695 | goto setup_ntlmv2_rsp_ret; |
696 | } | |
697 | } | |
698 | } else { | |
9daa42e2 | 699 | rc = build_avpair_blob(ses, nls_cp); |
2b149f11 | 700 | if (rc) { |
f96637be | 701 | cifs_dbg(VFS, "error %d building av pair blob\n", rc); |
d3686d54 | 702 | goto setup_ntlmv2_rsp_ret; |
2b149f11 SP |
703 | } |
704 | } | |
a8ee0344 | 705 | |
98ce94c8 PS |
706 | /* Must be within 5 minutes of the server (or in range +/-2h |
707 | * in case of Mac OS X), so simply carry over server timestamp | |
708 | * (as Windows 7 does) | |
709 | */ | |
710 | rsp_timestamp = find_timestamp(ses); | |
711 | ||
21e73393 | 712 | baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp); |
d3686d54 SP |
713 | tilen = ses->auth_key.len; |
714 | tiblob = ses->auth_key.response; | |
715 | ||
716 | ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL); | |
21e73393 | 717 | if (!ses->auth_key.response) { |
4b550af5 | 718 | rc = -ENOMEM; |
d3686d54 | 719 | ses->auth_key.len = 0; |
21e73393 SP |
720 | goto setup_ntlmv2_rsp_ret; |
721 | } | |
d3686d54 | 722 | ses->auth_key.len += baselen; |
21e73393 | 723 | |
2c957ddf | 724 | ntlmv2 = (struct ntlmv2_resp *) |
21e73393 | 725 | (ses->auth_key.response + CIFS_SESS_KEY_SIZE); |
2c957ddf TG |
726 | ntlmv2->blob_signature = cpu_to_le32(0x00000101); |
727 | ntlmv2->reserved = 0; | |
98ce94c8 PS |
728 | ntlmv2->time = rsp_timestamp; |
729 | ||
2c957ddf TG |
730 | get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal)); |
731 | ntlmv2->reserved2 = 0; | |
21e73393 | 732 | |
d3686d54 | 733 | memcpy(ses->auth_key.response + baselen, tiblob, tilen); |
21e73393 | 734 | |
95dc8dd1 SF |
735 | rc = crypto_hmacmd5_alloc(ses->server); |
736 | if (rc) { | |
737 | cifs_dbg(VFS, "could not crypto alloc hmacmd5 rc %d\n", rc); | |
738 | goto setup_ntlmv2_rsp_ret; | |
739 | } | |
740 | ||
f7c5445a | 741 | /* calculate ntlmv2_hash */ |
d3686d54 | 742 | rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp); |
2b149f11 | 743 | if (rc) { |
f96637be | 744 | cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc); |
2b149f11 SP |
745 | goto setup_ntlmv2_rsp_ret; |
746 | } | |
f7c5445a SP |
747 | |
748 | /* calculate first part of the client response (CR1) */ | |
d3686d54 | 749 | rc = CalcNTLMv2_response(ses, ntlmv2_hash); |
307fbd31 | 750 | if (rc) { |
f96637be | 751 | cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc); |
307fbd31 SP |
752 | goto setup_ntlmv2_rsp_ret; |
753 | } | |
b609f06a | 754 | |
5d0d2882 | 755 | /* now calculate the session key for NTLMv2 */ |
14cae324 | 756 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
d3686d54 | 757 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 758 | if (rc) { |
f96637be JP |
759 | cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", |
760 | __func__); | |
14cae324 SP |
761 | goto setup_ntlmv2_rsp_ret; |
762 | } | |
307fbd31 SP |
763 | |
764 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
765 | if (rc) { | |
f96637be | 766 | cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__); |
307fbd31 SP |
767 | goto setup_ntlmv2_rsp_ret; |
768 | } | |
769 | ||
14cae324 | 770 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
2c957ddf | 771 | ntlmv2->ntlmv2_hash, |
307fbd31 | 772 | CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 773 | if (rc) { |
f96637be | 774 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
14cae324 SP |
775 | goto setup_ntlmv2_rsp_ret; |
776 | } | |
307fbd31 SP |
777 | |
778 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
779 | ses->auth_key.response); | |
14cae324 | 780 | if (rc) |
f96637be | 781 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
2b149f11 | 782 | |
2b149f11 | 783 | setup_ntlmv2_rsp_ret: |
d3686d54 | 784 | kfree(tiblob); |
2b149f11 SP |
785 | |
786 | return rc; | |
6d027cfd SF |
787 | } |
788 | ||
d2b91521 | 789 | int |
96daf2b0 | 790 | calc_seckey(struct cifs_ses *ses) |
d2b91521 SP |
791 | { |
792 | int rc; | |
9651ddba | 793 | struct crypto_skcipher *tfm_arc4; |
d2b91521 | 794 | struct scatterlist sgin, sgout; |
9651ddba | 795 | struct skcipher_request *req; |
d2b91521 SP |
796 | unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */ |
797 | ||
798 | get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE); | |
799 | ||
9651ddba | 800 | tfm_arc4 = crypto_alloc_skcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC); |
7a8587e7 SP |
801 | if (IS_ERR(tfm_arc4)) { |
802 | rc = PTR_ERR(tfm_arc4); | |
f96637be | 803 | cifs_dbg(VFS, "could not allocate crypto API arc4\n"); |
7a8587e7 | 804 | return rc; |
d2b91521 SP |
805 | } |
806 | ||
9651ddba | 807 | rc = crypto_skcipher_setkey(tfm_arc4, ses->auth_key.response, |
d2b91521 | 808 | CIFS_SESS_KEY_SIZE); |
14cae324 | 809 | if (rc) { |
f96637be JP |
810 | cifs_dbg(VFS, "%s: Could not set response as a key\n", |
811 | __func__); | |
9651ddba HX |
812 | goto out_free_cipher; |
813 | } | |
814 | ||
815 | req = skcipher_request_alloc(tfm_arc4, GFP_KERNEL); | |
816 | if (!req) { | |
817 | rc = -ENOMEM; | |
818 | cifs_dbg(VFS, "could not allocate crypto API arc4 request\n"); | |
819 | goto out_free_cipher; | |
14cae324 | 820 | } |
d2b91521 SP |
821 | |
822 | sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE); | |
d3686d54 | 823 | sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); |
d2b91521 | 824 | |
9651ddba HX |
825 | skcipher_request_set_callback(req, 0, NULL, NULL); |
826 | skcipher_request_set_crypt(req, &sgin, &sgout, CIFS_CPHTXT_SIZE, NULL); | |
827 | ||
828 | rc = crypto_skcipher_encrypt(req); | |
829 | skcipher_request_free(req); | |
d2b91521 | 830 | if (rc) { |
f96637be | 831 | cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc); |
9651ddba | 832 | goto out_free_cipher; |
d2b91521 SP |
833 | } |
834 | ||
835 | /* make secondary_key/nonce as session key */ | |
836 | memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE); | |
837 | /* and make len as that of session key only */ | |
838 | ses->auth_key.len = CIFS_SESS_KEY_SIZE; | |
839 | ||
9651ddba HX |
840 | out_free_cipher: |
841 | crypto_free_skcipher(tfm_arc4); | |
d2b91521 | 842 | |
14cae324 | 843 | return rc; |
d2b91521 SP |
844 | } |
845 | ||
846 | void | |
847 | cifs_crypto_shash_release(struct TCP_Server_Info *server) | |
848 | { | |
95dc8dd1 | 849 | if (server->secmech.cmacaes) { |
429b46f4 | 850 | crypto_free_shash(server->secmech.cmacaes); |
95dc8dd1 SF |
851 | server->secmech.cmacaes = NULL; |
852 | } | |
429b46f4 | 853 | |
95dc8dd1 | 854 | if (server->secmech.hmacsha256) { |
3c1bf7e4 | 855 | crypto_free_shash(server->secmech.hmacsha256); |
95dc8dd1 SF |
856 | server->secmech.hmacsha256 = NULL; |
857 | } | |
3c1bf7e4 | 858 | |
95dc8dd1 | 859 | if (server->secmech.md5) { |
d2b91521 | 860 | crypto_free_shash(server->secmech.md5); |
95dc8dd1 SF |
861 | server->secmech.md5 = NULL; |
862 | } | |
d2b91521 | 863 | |
95dc8dd1 | 864 | if (server->secmech.hmacmd5) { |
d2b91521 | 865 | crypto_free_shash(server->secmech.hmacmd5); |
95dc8dd1 SF |
866 | server->secmech.hmacmd5 = NULL; |
867 | } | |
d2b91521 | 868 | |
429b46f4 | 869 | kfree(server->secmech.sdesccmacaes); |
95dc8dd1 | 870 | server->secmech.sdesccmacaes = NULL; |
3c1bf7e4 | 871 | kfree(server->secmech.sdeschmacsha256); |
95dc8dd1 | 872 | server->secmech.sdeschmacsha256 = NULL; |
d2b91521 | 873 | kfree(server->secmech.sdeschmacmd5); |
95dc8dd1 | 874 | server->secmech.sdeschmacmd5 = NULL; |
d2b91521 | 875 | kfree(server->secmech.sdescmd5); |
95dc8dd1 | 876 | server->secmech.sdescmd5 = NULL; |
d2b91521 | 877 | } |