]>
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> |
1da177e4 | 36 | |
95dc8dd1 SF |
37 | static int |
38 | cifs_crypto_shash_md5_allocate(struct TCP_Server_Info *server) | |
39 | { | |
40 | int rc; | |
41 | unsigned int size; | |
42 | ||
43 | if (server->secmech.sdescmd5 != NULL) | |
44 | return 0; /* already allocated */ | |
45 | ||
46 | server->secmech.md5 = crypto_alloc_shash("md5", 0, 0); | |
47 | if (IS_ERR(server->secmech.md5)) { | |
48 | cifs_dbg(VFS, "could not allocate crypto md5\n"); | |
ba482029 JL |
49 | rc = PTR_ERR(server->secmech.md5); |
50 | server->secmech.md5 = NULL; | |
51 | return rc; | |
95dc8dd1 SF |
52 | } |
53 | ||
54 | size = sizeof(struct shash_desc) + | |
55 | crypto_shash_descsize(server->secmech.md5); | |
56 | server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL); | |
57 | if (!server->secmech.sdescmd5) { | |
95dc8dd1 SF |
58 | crypto_free_shash(server->secmech.md5); |
59 | server->secmech.md5 = NULL; | |
ba482029 | 60 | return -ENOMEM; |
95dc8dd1 SF |
61 | } |
62 | server->secmech.sdescmd5->shash.tfm = server->secmech.md5; | |
63 | server->secmech.sdescmd5->shash.flags = 0x0; | |
64 | ||
65 | return 0; | |
66 | } | |
67 | ||
157c2491 JL |
68 | /* |
69 | * Calculate and return the CIFS signature based on the mac key and SMB PDU. | |
70 | * The 16 byte signature must be allocated by the caller. Note we only use the | |
71 | * 1st eight bytes and that the smb header signature field on input contains | |
72 | * the sequence number before this function is called. Also, this function | |
73 | * should be called with the server->srv_mutex held. | |
74 | */ | |
bf5ea0e2 | 75 | static int cifs_calc_signature(struct smb_rqst *rqst, |
826a95e4 | 76 | struct TCP_Server_Info *server, char *signature) |
84afc29b | 77 | { |
e9917a00 | 78 | int i; |
307fbd31 | 79 | int rc; |
bf5ea0e2 JL |
80 | struct kvec *iov = rqst->rq_iov; |
81 | int n_vec = rqst->rq_nvec; | |
84afc29b | 82 | |
21e73393 | 83 | if (iov == NULL || signature == NULL || server == NULL) |
e9917a00 | 84 | return -EINVAL; |
84afc29b | 85 | |
307fbd31 | 86 | if (!server->secmech.sdescmd5) { |
95dc8dd1 SF |
87 | rc = cifs_crypto_shash_md5_allocate(server); |
88 | if (rc) { | |
89 | cifs_dbg(VFS, "%s: Can't alloc md5 crypto\n", __func__); | |
90 | return -1; | |
91 | } | |
307fbd31 SP |
92 | } |
93 | ||
94 | rc = crypto_shash_init(&server->secmech.sdescmd5->shash); | |
95 | if (rc) { | |
f96637be | 96 | cifs_dbg(VFS, "%s: Could not init md5\n", __func__); |
307fbd31 SP |
97 | return rc; |
98 | } | |
99 | ||
14cae324 | 100 | rc = crypto_shash_update(&server->secmech.sdescmd5->shash, |
307fbd31 | 101 | server->session_key.response, server->session_key.len); |
14cae324 | 102 | if (rc) { |
f96637be | 103 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
14cae324 SP |
104 | return rc; |
105 | } | |
307fbd31 | 106 | |
50c2f753 | 107 | for (i = 0; i < n_vec; i++) { |
745542e2 JL |
108 | if (iov[i].iov_len == 0) |
109 | continue; | |
ffdd6e4d | 110 | if (iov[i].iov_base == NULL) { |
f96637be | 111 | cifs_dbg(VFS, "null iovec entry\n"); |
e9917a00 | 112 | return -EIO; |
745542e2 | 113 | } |
ffdd6e4d | 114 | /* The first entry includes a length field (which does not get |
e9917a00 | 115 | signed that occupies the first 4 bytes before the header */ |
ffdd6e4d | 116 | if (i == 0) { |
63d2583f | 117 | if (iov[0].iov_len <= 8) /* cmd field at offset 9 */ |
e9917a00 | 118 | break; /* nothing to sign or corrupt header */ |
14cae324 | 119 | rc = |
307fbd31 SP |
120 | crypto_shash_update(&server->secmech.sdescmd5->shash, |
121 | iov[i].iov_base + 4, iov[i].iov_len - 4); | |
14cae324 SP |
122 | } else { |
123 | rc = | |
307fbd31 SP |
124 | crypto_shash_update(&server->secmech.sdescmd5->shash, |
125 | iov[i].iov_base, iov[i].iov_len); | |
14cae324 SP |
126 | } |
127 | if (rc) { | |
f96637be JP |
128 | cifs_dbg(VFS, "%s: Could not update with payload\n", |
129 | __func__); | |
14cae324 SP |
130 | return rc; |
131 | } | |
e9917a00 | 132 | } |
84afc29b | 133 | |
fb308a6f JL |
134 | /* now hash over the rq_pages array */ |
135 | for (i = 0; i < rqst->rq_npages; i++) { | |
136 | struct kvec p_iov; | |
137 | ||
138 | cifs_rqst_page_to_kvec(rqst, i, &p_iov); | |
139 | crypto_shash_update(&server->secmech.sdescmd5->shash, | |
140 | p_iov.iov_base, p_iov.iov_len); | |
141 | kunmap(rqst->rq_pages[i]); | |
142 | } | |
143 | ||
307fbd31 | 144 | rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature); |
14cae324 | 145 | if (rc) |
f96637be | 146 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
84afc29b | 147 | |
307fbd31 | 148 | return rc; |
84afc29b SF |
149 | } |
150 | ||
a0f8b4fb | 151 | /* must be called with server->srv_mutex held */ |
bf5ea0e2 | 152 | int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server, |
63d2583f | 153 | __u32 *pexpected_response_sequence_number) |
84afc29b SF |
154 | { |
155 | int rc = 0; | |
156 | char smb_signature[20]; | |
bf5ea0e2 | 157 | struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
84afc29b | 158 | |
ffdd6e4d | 159 | if ((cifs_pdu == NULL) || (server == NULL)) |
84afc29b SF |
160 | return -EINVAL; |
161 | ||
998d6fcb JL |
162 | if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) || |
163 | server->tcpStatus == CifsNeedNegotiate) | |
84afc29b SF |
164 | return rc; |
165 | ||
998d6fcb | 166 | if (!server->session_estab) { |
b4dacbc2 | 167 | memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8); |
998d6fcb JL |
168 | return rc; |
169 | } | |
170 | ||
ffdd6e4d | 171 | cifs_pdu->Signature.Sequence.SequenceNumber = |
84afc29b | 172 | cpu_to_le32(server->sequence_number); |
ffdd6e4d | 173 | cifs_pdu->Signature.Sequence.Reserved = 0; |
84afc29b | 174 | |
0124cc45 JL |
175 | *pexpected_response_sequence_number = ++server->sequence_number; |
176 | ++server->sequence_number; | |
84afc29b | 177 | |
bf5ea0e2 | 178 | rc = cifs_calc_signature(rqst, server, smb_signature); |
ffdd6e4d SF |
179 | if (rc) |
180 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |
181 | else | |
182 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
84afc29b | 183 | |
ffdd6e4d | 184 | return rc; |
84afc29b SF |
185 | } |
186 | ||
bf5ea0e2 JL |
187 | int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server, |
188 | __u32 *pexpected_response_sequence) | |
189 | { | |
190 | struct smb_rqst rqst = { .rq_iov = iov, | |
191 | .rq_nvec = n_vec }; | |
192 | ||
193 | return cifs_sign_rqst(&rqst, server, pexpected_response_sequence); | |
194 | } | |
195 | ||
826a95e4 JL |
196 | /* must be called with server->srv_mutex held */ |
197 | int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server, | |
198 | __u32 *pexpected_response_sequence_number) | |
199 | { | |
200 | struct kvec iov; | |
201 | ||
202 | iov.iov_base = cifs_pdu; | |
203 | iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4; | |
204 | ||
762a4206 | 205 | return cifs_sign_smbv(&iov, 1, server, |
826a95e4 JL |
206 | pexpected_response_sequence_number); |
207 | } | |
208 | ||
bf5ea0e2 | 209 | int cifs_verify_signature(struct smb_rqst *rqst, |
21e73393 | 210 | struct TCP_Server_Info *server, |
ffdd6e4d | 211 | __u32 expected_sequence_number) |
1da177e4 | 212 | { |
c8e56f1f | 213 | unsigned int rc; |
1da177e4 LT |
214 | char server_response_sig[8]; |
215 | char what_we_think_sig_should_be[20]; | |
bf5ea0e2 | 216 | struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
1da177e4 | 217 | |
21e73393 | 218 | if (cifs_pdu == NULL || server == NULL) |
1da177e4 LT |
219 | return -EINVAL; |
220 | ||
9c4843ea | 221 | if (!server->session_estab) |
1da177e4 LT |
222 | return 0; |
223 | ||
224 | if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) { | |
50c2f753 | 225 | struct smb_com_lock_req *pSMB = |
ffdd6e4d SF |
226 | (struct smb_com_lock_req *)cifs_pdu; |
227 | if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) | |
1da177e4 LT |
228 | return 0; |
229 | } | |
230 | ||
50c2f753 SF |
231 | /* BB what if signatures are supposed to be on for session but |
232 | server does not send one? BB */ | |
233 | ||
1da177e4 | 234 | /* Do not need to verify session setups with signature "BSRSPYL " */ |
50c2f753 | 235 | if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0) |
f96637be JP |
236 | cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n", |
237 | cifs_pdu->Command); | |
1da177e4 LT |
238 | |
239 | /* save off the origiginal signature so we can modify the smb and check | |
240 | its signature against what the server sent */ | |
50c2f753 | 241 | memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8); |
1da177e4 | 242 | |
50c2f753 SF |
243 | cifs_pdu->Signature.Sequence.SequenceNumber = |
244 | cpu_to_le32(expected_sequence_number); | |
1da177e4 LT |
245 | cifs_pdu->Signature.Sequence.Reserved = 0; |
246 | ||
157c2491 | 247 | mutex_lock(&server->srv_mutex); |
bf5ea0e2 | 248 | rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be); |
157c2491 | 249 | mutex_unlock(&server->srv_mutex); |
1da177e4 | 250 | |
50c2f753 | 251 | if (rc) |
1da177e4 LT |
252 | return rc; |
253 | ||
50c2f753 SF |
254 | /* cifs_dump_mem("what we think it should be: ", |
255 | what_we_think_sig_should_be, 16); */ | |
1da177e4 | 256 | |
50c2f753 | 257 | if (memcmp(server_response_sig, what_we_think_sig_should_be, 8)) |
1da177e4 LT |
258 | return -EACCES; |
259 | else | |
260 | return 0; | |
261 | ||
262 | } | |
263 | ||
21e73393 | 264 | /* first calculate 24 bytes ntlm response and then 16 byte session key */ |
9ef5992e | 265 | int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp) |
1da177e4 | 266 | { |
ee2c9258 | 267 | int rc = 0; |
21e73393 SP |
268 | unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE; |
269 | char temp_key[CIFS_SESS_KEY_SIZE]; | |
270 | ||
271 | if (!ses) | |
1da177e4 LT |
272 | return -EINVAL; |
273 | ||
21e73393 | 274 | ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL); |
f96637be | 275 | if (!ses->auth_key.response) |
21e73393 | 276 | return -ENOMEM; |
f96637be | 277 | |
21e73393 SP |
278 | ses->auth_key.len = temp_len; |
279 | ||
ee2c9258 | 280 | rc = SMBNTencrypt(ses->password, ses->server->cryptkey, |
9ef5992e | 281 | ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp); |
ee2c9258 | 282 | if (rc) { |
f96637be JP |
283 | cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n", |
284 | __func__, rc); | |
ee2c9258 SP |
285 | return rc; |
286 | } | |
287 | ||
9ef5992e | 288 | rc = E_md4hash(ses->password, temp_key, nls_cp); |
ee2c9258 | 289 | if (rc) { |
f96637be JP |
290 | cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n", |
291 | __func__, rc); | |
ee2c9258 SP |
292 | return rc; |
293 | } | |
21e73393 | 294 | |
ee2c9258 SP |
295 | rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE); |
296 | if (rc) | |
f96637be JP |
297 | cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n", |
298 | __func__, rc); | |
21e73393 | 299 | |
ee2c9258 | 300 | return rc; |
1da177e4 LT |
301 | } |
302 | ||
7c7b25bc | 303 | #ifdef CONFIG_CIFS_WEAK_PW_HASH |
43988d76 | 304 | int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt, |
4e53a3fb | 305 | char *lnm_session_key) |
7c7b25bc SF |
306 | { |
307 | int i; | |
43988d76 | 308 | int rc; |
7c7b25bc SF |
309 | char password_with_pad[CIFS_ENCPWD_SIZE]; |
310 | ||
311 | memset(password_with_pad, 0, CIFS_ENCPWD_SIZE); | |
4e53a3fb JL |
312 | if (password) |
313 | strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE); | |
314 | ||
04912d6a | 315 | if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) { |
4e53a3fb JL |
316 | memcpy(lnm_session_key, password_with_pad, |
317 | CIFS_ENCPWD_SIZE); | |
43988d76 | 318 | return 0; |
4e53a3fb | 319 | } |
bdc4bf6e | 320 | |
7c7b25bc SF |
321 | /* calculate old style session key */ |
322 | /* calling toupper is less broken than repeatedly | |
323 | calling nls_toupper would be since that will never | |
324 | work for UTF8, but neither handles multibyte code pages | |
325 | but the only alternative would be converting to UCS-16 (Unicode) | |
326 | (using a routine something like UniStrupr) then | |
327 | uppercasing and then converting back from Unicode - which | |
328 | would only worth doing it if we knew it were utf8. Basically | |
329 | utf8 and other multibyte codepages each need their own strupper | |
330 | function since a byte at a time will ont work. */ | |
331 | ||
ef571cad | 332 | for (i = 0; i < CIFS_ENCPWD_SIZE; i++) |
7c7b25bc | 333 | password_with_pad[i] = toupper(password_with_pad[i]); |
7c7b25bc | 334 | |
43988d76 | 335 | rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key); |
4e53a3fb | 336 | |
43988d76 | 337 | return rc; |
7c7b25bc SF |
338 | } |
339 | #endif /* CIFS_WEAK_PW_HASH */ | |
340 | ||
9daa42e2 SP |
341 | /* Build a proper attribute value/target info pairs blob. |
342 | * Fill in netbios and dns domain name and workstation name | |
343 | * and client time (total five av pairs and + one end of fields indicator. | |
344 | * Allocate domain name which gets freed when session struct is deallocated. | |
2b149f11 SP |
345 | */ |
346 | static int | |
96daf2b0 | 347 | build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 | 348 | { |
9daa42e2 | 349 | unsigned int dlen; |
cfbd6f84 | 350 | unsigned int size = 2 * sizeof(struct ntlmssp2_name); |
9daa42e2 SP |
351 | char *defdmname = "WORKGROUP"; |
352 | unsigned char *blobptr; | |
2b149f11 SP |
353 | struct ntlmssp2_name *attrptr; |
354 | ||
9daa42e2 SP |
355 | if (!ses->domainName) { |
356 | ses->domainName = kstrdup(defdmname, GFP_KERNEL); | |
357 | if (!ses->domainName) | |
358 | return -ENOMEM; | |
359 | } | |
360 | ||
361 | dlen = strlen(ses->domainName); | |
9daa42e2 | 362 | |
cfbd6f84 SP |
363 | /* |
364 | * The length of this blob is two times the size of a | |
365 | * structure (av pair) which holds name/size | |
366 | * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) + | |
367 | * unicode length of a netbios domain name | |
9daa42e2 | 368 | */ |
cfbd6f84 | 369 | ses->auth_key.len = size + 2 * dlen; |
d3686d54 SP |
370 | ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL); |
371 | if (!ses->auth_key.response) { | |
372 | ses->auth_key.len = 0; | |
2b149f11 SP |
373 | return -ENOMEM; |
374 | } | |
9daa42e2 | 375 | |
d3686d54 | 376 | blobptr = ses->auth_key.response; |
9daa42e2 SP |
377 | attrptr = (struct ntlmssp2_name *) blobptr; |
378 | ||
cfbd6f84 SP |
379 | /* |
380 | * As defined in MS-NTLM 3.3.2, just this av pair field | |
381 | * is sufficient as part of the temp | |
382 | */ | |
9daa42e2 SP |
383 | attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME); |
384 | attrptr->length = cpu_to_le16(2 * dlen); | |
385 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
acbbb76a | 386 | cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp); |
9daa42e2 | 387 | |
2b149f11 SP |
388 | return 0; |
389 | } | |
390 | ||
391 | /* Server has provided av pairs/target info in the type 2 challenge | |
392 | * packet and we have plucked it and stored within smb session. | |
393 | * We parse that blob here to find netbios domain name to be used | |
394 | * as part of ntlmv2 authentication (in Target String), if not already | |
395 | * specified on the command line. | |
396 | * If this function returns without any error but without fetching | |
397 | * domain name, authentication may fail against some server but | |
398 | * may not fail against other (those who are not very particular | |
399 | * about target string i.e. for some, just user name might suffice. | |
400 | */ | |
401 | static int | |
96daf2b0 | 402 | find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 SP |
403 | { |
404 | unsigned int attrsize; | |
405 | unsigned int type; | |
406 | unsigned int onesize = sizeof(struct ntlmssp2_name); | |
407 | unsigned char *blobptr; | |
408 | unsigned char *blobend; | |
409 | struct ntlmssp2_name *attrptr; | |
410 | ||
d3686d54 | 411 | if (!ses->auth_key.len || !ses->auth_key.response) |
2b149f11 SP |
412 | return 0; |
413 | ||
d3686d54 SP |
414 | blobptr = ses->auth_key.response; |
415 | blobend = blobptr + ses->auth_key.len; | |
2b149f11 SP |
416 | |
417 | while (blobptr + onesize < blobend) { | |
418 | attrptr = (struct ntlmssp2_name *) blobptr; | |
419 | type = le16_to_cpu(attrptr->type); | |
420 | if (type == NTLMSSP_AV_EOL) | |
421 | break; | |
422 | blobptr += 2; /* advance attr type */ | |
423 | attrsize = le16_to_cpu(attrptr->length); | |
424 | blobptr += 2; /* advance attr size */ | |
425 | if (blobptr + attrsize > blobend) | |
426 | break; | |
427 | if (type == NTLMSSP_AV_NB_DOMAIN_NAME) { | |
057d6332 | 428 | if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN) |
2b149f11 SP |
429 | break; |
430 | if (!ses->domainName) { | |
431 | ses->domainName = | |
432 | kmalloc(attrsize + 1, GFP_KERNEL); | |
433 | if (!ses->domainName) | |
434 | return -ENOMEM; | |
acbbb76a | 435 | cifs_from_utf16(ses->domainName, |
2b149f11 | 436 | (__le16 *)blobptr, attrsize, attrsize, |
b693855f | 437 | nls_cp, NO_MAP_UNI_RSVD); |
2b149f11 SP |
438 | break; |
439 | } | |
440 | } | |
441 | blobptr += attrsize; /* advance attr value */ | |
442 | } | |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
98ce94c8 PS |
447 | /* Server has provided av pairs/target info in the type 2 challenge |
448 | * packet and we have plucked it and stored within smb session. | |
449 | * We parse that blob here to find the server given timestamp | |
450 | * as part of ntlmv2 authentication (or local current time as | |
451 | * default in case of failure) | |
452 | */ | |
453 | static __le64 | |
454 | find_timestamp(struct cifs_ses *ses) | |
455 | { | |
456 | unsigned int attrsize; | |
457 | unsigned int type; | |
458 | unsigned int onesize = sizeof(struct ntlmssp2_name); | |
459 | unsigned char *blobptr; | |
460 | unsigned char *blobend; | |
461 | struct ntlmssp2_name *attrptr; | |
462 | ||
463 | if (!ses->auth_key.len || !ses->auth_key.response) | |
464 | return 0; | |
465 | ||
466 | blobptr = ses->auth_key.response; | |
467 | blobend = blobptr + ses->auth_key.len; | |
468 | ||
469 | while (blobptr + onesize < blobend) { | |
470 | attrptr = (struct ntlmssp2_name *) blobptr; | |
471 | type = le16_to_cpu(attrptr->type); | |
472 | if (type == NTLMSSP_AV_EOL) | |
473 | break; | |
474 | blobptr += 2; /* advance attr type */ | |
475 | attrsize = le16_to_cpu(attrptr->length); | |
476 | blobptr += 2; /* advance attr size */ | |
477 | if (blobptr + attrsize > blobend) | |
478 | break; | |
479 | if (type == NTLMSSP_AV_TIMESTAMP) { | |
480 | if (attrsize == sizeof(u64)) | |
481 | return *((__le64 *)blobptr); | |
482 | } | |
483 | blobptr += attrsize; /* advance attr value */ | |
484 | } | |
485 | ||
486 | return cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME)); | |
487 | } | |
488 | ||
96daf2b0 | 489 | static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash, |
50c2f753 | 490 | const struct nls_table *nls_cp) |
a8ee0344 SF |
491 | { |
492 | int rc = 0; | |
493 | int len; | |
307fbd31 | 494 | char nt_hash[CIFS_NTHASH_SIZE]; |
fdf96a90 | 495 | __le16 *user; |
50c2f753 | 496 | wchar_t *domain; |
307fbd31 | 497 | wchar_t *server; |
a8ee0344 | 498 | |
307fbd31 | 499 | if (!ses->server->secmech.sdeschmacmd5) { |
f96637be | 500 | cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); |
307fbd31 SP |
501 | return -1; |
502 | } | |
56234e27 | 503 | |
c8e56f1f | 504 | /* calculate md4 hash of password */ |
9ef5992e | 505 | E_md4hash(ses->password, nt_hash, nls_cp); |
9fbc5908 | 506 | |
14cae324 | 507 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash, |
307fbd31 | 508 | CIFS_NTHASH_SIZE); |
14cae324 | 509 | if (rc) { |
f96637be | 510 | cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__); |
14cae324 SP |
511 | return rc; |
512 | } | |
307fbd31 SP |
513 | |
514 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
515 | if (rc) { | |
f96637be | 516 | cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__); |
307fbd31 SP |
517 | return rc; |
518 | } | |
a8ee0344 | 519 | |
fdf96a90 | 520 | /* convert ses->user_name to unicode */ |
04febabc | 521 | len = ses->user_name ? strlen(ses->user_name) : 0; |
1717ffc5 | 522 | user = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 523 | if (user == NULL) { |
307fbd31 | 524 | rc = -ENOMEM; |
14cae324 | 525 | return rc; |
307fbd31 | 526 | } |
04febabc JL |
527 | |
528 | if (len) { | |
fdf96a90 | 529 | len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp); |
04febabc JL |
530 | UniStrupr(user); |
531 | } else { | |
532 | memset(user, '\0', 2); | |
533 | } | |
307fbd31 | 534 | |
14cae324 | 535 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 | 536 | (char *)user, 2 * len); |
14cae324 SP |
537 | kfree(user); |
538 | if (rc) { | |
f96637be | 539 | cifs_dbg(VFS, "%s: Could not update with user\n", __func__); |
14cae324 SP |
540 | return rc; |
541 | } | |
a8ee0344 SF |
542 | |
543 | /* convert ses->domainName to unicode and uppercase */ | |
50c2f753 | 544 | if (ses->domainName) { |
1717ffc5 | 545 | len = strlen(ses->domainName); |
a8ee0344 | 546 | |
50c2f753 | 547 | domain = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 548 | if (domain == NULL) { |
307fbd31 | 549 | rc = -ENOMEM; |
14cae324 | 550 | return rc; |
307fbd31 | 551 | } |
acbbb76a SF |
552 | len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len, |
553 | nls_cp); | |
14cae324 | 554 | rc = |
307fbd31 SP |
555 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
556 | (char *)domain, 2 * len); | |
1717ffc5 | 557 | kfree(domain); |
14cae324 | 558 | if (rc) { |
f96637be JP |
559 | cifs_dbg(VFS, "%s: Could not update with domain\n", |
560 | __func__); | |
14cae324 SP |
561 | return rc; |
562 | } | |
8b7a4544 SF |
563 | } else { |
564 | /* We use ses->serverName if no domain name available */ | |
307fbd31 SP |
565 | len = strlen(ses->serverName); |
566 | ||
567 | server = kmalloc(2 + (len * 2), GFP_KERNEL); | |
568 | if (server == NULL) { | |
307fbd31 | 569 | rc = -ENOMEM; |
14cae324 | 570 | return rc; |
307fbd31 | 571 | } |
acbbb76a | 572 | len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len, |
307fbd31 | 573 | nls_cp); |
14cae324 | 574 | rc = |
307fbd31 SP |
575 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
576 | (char *)server, 2 * len); | |
577 | kfree(server); | |
14cae324 | 578 | if (rc) { |
f96637be JP |
579 | cifs_dbg(VFS, "%s: Could not update with server\n", |
580 | __func__); | |
14cae324 SP |
581 | return rc; |
582 | } | |
1717ffc5 | 583 | } |
307fbd31 SP |
584 | |
585 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
d3686d54 | 586 | ntlmv2_hash); |
14cae324 | 587 | if (rc) |
f96637be | 588 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
307fbd31 | 589 | |
307fbd31 SP |
590 | return rc; |
591 | } | |
592 | ||
593 | static int | |
96daf2b0 | 594 | CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash) |
307fbd31 SP |
595 | { |
596 | int rc; | |
2c957ddf TG |
597 | struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *) |
598 | (ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
599 | unsigned int hash_len; | |
600 | ||
601 | /* The MD5 hash starts at challenge_key.key */ | |
602 | hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE + | |
603 | offsetof(struct ntlmv2_resp, challenge.key[0])); | |
307fbd31 SP |
604 | |
605 | if (!ses->server->secmech.sdeschmacmd5) { | |
f96637be | 606 | cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); |
307fbd31 SP |
607 | return -1; |
608 | } | |
609 | ||
14cae324 | 610 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
2c957ddf | 611 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 612 | if (rc) { |
f96637be JP |
613 | cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", |
614 | __func__); | |
14cae324 SP |
615 | return rc; |
616 | } | |
307fbd31 SP |
617 | |
618 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
619 | if (rc) { | |
f96637be | 620 | cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__); |
307fbd31 SP |
621 | return rc; |
622 | } | |
623 | ||
3f618223 | 624 | if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) |
2c957ddf TG |
625 | memcpy(ntlmv2->challenge.key, |
626 | ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); | |
d3ba50b1 | 627 | else |
2c957ddf TG |
628 | memcpy(ntlmv2->challenge.key, |
629 | ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); | |
14cae324 | 630 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
2c957ddf | 631 | ntlmv2->challenge.key, hash_len); |
14cae324 | 632 | if (rc) { |
f96637be | 633 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
14cae324 SP |
634 | return rc; |
635 | } | |
307fbd31 | 636 | |
2c957ddf | 637 | /* Note that the MD5 digest over writes anon.challenge_key.key */ |
307fbd31 | 638 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, |
2c957ddf | 639 | ntlmv2->ntlmv2_hash); |
14cae324 | 640 | if (rc) |
f96637be | 641 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
9fbc5908 SF |
642 | |
643 | return rc; | |
644 | } | |
645 | ||
95dc8dd1 SF |
646 | static int crypto_hmacmd5_alloc(struct TCP_Server_Info *server) |
647 | { | |
ba482029 | 648 | int rc; |
95dc8dd1 SF |
649 | unsigned int size; |
650 | ||
651 | /* check if already allocated */ | |
652 | if (server->secmech.sdeschmacmd5) | |
653 | return 0; | |
654 | ||
655 | server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0); | |
656 | if (IS_ERR(server->secmech.hmacmd5)) { | |
657 | cifs_dbg(VFS, "could not allocate crypto hmacmd5\n"); | |
ba482029 JL |
658 | rc = PTR_ERR(server->secmech.hmacmd5); |
659 | server->secmech.hmacmd5 = NULL; | |
660 | return rc; | |
95dc8dd1 SF |
661 | } |
662 | ||
663 | size = sizeof(struct shash_desc) + | |
664 | crypto_shash_descsize(server->secmech.hmacmd5); | |
665 | server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL); | |
666 | if (!server->secmech.sdeschmacmd5) { | |
667 | crypto_free_shash(server->secmech.hmacmd5); | |
668 | server->secmech.hmacmd5 = NULL; | |
669 | return -ENOMEM; | |
670 | } | |
671 | server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5; | |
672 | server->secmech.sdeschmacmd5->shash.flags = 0x0; | |
673 | ||
674 | return 0; | |
675 | } | |
307fbd31 | 676 | |
2b149f11 | 677 | int |
96daf2b0 | 678 | setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp) |
9fbc5908 | 679 | { |
c8e56f1f | 680 | int rc; |
21e73393 | 681 | int baselen; |
d3686d54 | 682 | unsigned int tilen; |
2c957ddf | 683 | struct ntlmv2_resp *ntlmv2; |
d3686d54 SP |
684 | char ntlmv2_hash[16]; |
685 | unsigned char *tiblob = NULL; /* target info blob */ | |
98ce94c8 | 686 | __le64 rsp_timestamp; |
6d027cfd | 687 | |
3f618223 | 688 | if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) { |
2b149f11 | 689 | if (!ses->domainName) { |
f7c5445a | 690 | rc = find_domain_name(ses, nls_cp); |
2b149f11 | 691 | if (rc) { |
f96637be JP |
692 | cifs_dbg(VFS, "error %d finding domain name\n", |
693 | rc); | |
2b149f11 SP |
694 | goto setup_ntlmv2_rsp_ret; |
695 | } | |
696 | } | |
697 | } else { | |
9daa42e2 | 698 | rc = build_avpair_blob(ses, nls_cp); |
2b149f11 | 699 | if (rc) { |
f96637be | 700 | cifs_dbg(VFS, "error %d building av pair blob\n", rc); |
d3686d54 | 701 | goto setup_ntlmv2_rsp_ret; |
2b149f11 SP |
702 | } |
703 | } | |
a8ee0344 | 704 | |
98ce94c8 PS |
705 | /* Must be within 5 minutes of the server (or in range +/-2h |
706 | * in case of Mac OS X), so simply carry over server timestamp | |
707 | * (as Windows 7 does) | |
708 | */ | |
709 | rsp_timestamp = find_timestamp(ses); | |
710 | ||
21e73393 | 711 | baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp); |
d3686d54 SP |
712 | tilen = ses->auth_key.len; |
713 | tiblob = ses->auth_key.response; | |
714 | ||
715 | ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL); | |
21e73393 SP |
716 | if (!ses->auth_key.response) { |
717 | rc = ENOMEM; | |
d3686d54 | 718 | ses->auth_key.len = 0; |
21e73393 SP |
719 | goto setup_ntlmv2_rsp_ret; |
720 | } | |
d3686d54 | 721 | ses->auth_key.len += baselen; |
21e73393 | 722 | |
2c957ddf | 723 | ntlmv2 = (struct ntlmv2_resp *) |
21e73393 | 724 | (ses->auth_key.response + CIFS_SESS_KEY_SIZE); |
2c957ddf TG |
725 | ntlmv2->blob_signature = cpu_to_le32(0x00000101); |
726 | ntlmv2->reserved = 0; | |
98ce94c8 PS |
727 | ntlmv2->time = rsp_timestamp; |
728 | ||
2c957ddf TG |
729 | get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal)); |
730 | ntlmv2->reserved2 = 0; | |
21e73393 | 731 | |
d3686d54 | 732 | memcpy(ses->auth_key.response + baselen, tiblob, tilen); |
21e73393 | 733 | |
95dc8dd1 SF |
734 | rc = crypto_hmacmd5_alloc(ses->server); |
735 | if (rc) { | |
736 | cifs_dbg(VFS, "could not crypto alloc hmacmd5 rc %d\n", rc); | |
737 | goto setup_ntlmv2_rsp_ret; | |
738 | } | |
739 | ||
f7c5445a | 740 | /* calculate ntlmv2_hash */ |
d3686d54 | 741 | rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp); |
2b149f11 | 742 | if (rc) { |
f96637be | 743 | cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc); |
2b149f11 SP |
744 | goto setup_ntlmv2_rsp_ret; |
745 | } | |
f7c5445a SP |
746 | |
747 | /* calculate first part of the client response (CR1) */ | |
d3686d54 | 748 | rc = CalcNTLMv2_response(ses, ntlmv2_hash); |
307fbd31 | 749 | if (rc) { |
f96637be | 750 | cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc); |
307fbd31 SP |
751 | goto setup_ntlmv2_rsp_ret; |
752 | } | |
b609f06a | 753 | |
5d0d2882 | 754 | /* now calculate the session key for NTLMv2 */ |
14cae324 | 755 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
d3686d54 | 756 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 757 | if (rc) { |
f96637be JP |
758 | cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", |
759 | __func__); | |
14cae324 SP |
760 | goto setup_ntlmv2_rsp_ret; |
761 | } | |
307fbd31 SP |
762 | |
763 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
764 | if (rc) { | |
f96637be | 765 | cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__); |
307fbd31 SP |
766 | goto setup_ntlmv2_rsp_ret; |
767 | } | |
768 | ||
14cae324 | 769 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
2c957ddf | 770 | ntlmv2->ntlmv2_hash, |
307fbd31 | 771 | CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 772 | if (rc) { |
f96637be | 773 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
14cae324 SP |
774 | goto setup_ntlmv2_rsp_ret; |
775 | } | |
307fbd31 SP |
776 | |
777 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
778 | ses->auth_key.response); | |
14cae324 | 779 | if (rc) |
f96637be | 780 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
2b149f11 | 781 | |
2b149f11 | 782 | setup_ntlmv2_rsp_ret: |
d3686d54 | 783 | kfree(tiblob); |
2b149f11 SP |
784 | |
785 | return rc; | |
6d027cfd SF |
786 | } |
787 | ||
d2b91521 | 788 | int |
96daf2b0 | 789 | calc_seckey(struct cifs_ses *ses) |
d2b91521 SP |
790 | { |
791 | int rc; | |
792 | struct crypto_blkcipher *tfm_arc4; | |
793 | struct scatterlist sgin, sgout; | |
794 | struct blkcipher_desc desc; | |
795 | unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */ | |
796 | ||
797 | get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE); | |
798 | ||
799 | tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC); | |
7a8587e7 SP |
800 | if (IS_ERR(tfm_arc4)) { |
801 | rc = PTR_ERR(tfm_arc4); | |
f96637be | 802 | cifs_dbg(VFS, "could not allocate crypto API arc4\n"); |
7a8587e7 | 803 | return rc; |
d2b91521 SP |
804 | } |
805 | ||
806 | desc.tfm = tfm_arc4; | |
807 | ||
14cae324 | 808 | rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response, |
d2b91521 | 809 | CIFS_SESS_KEY_SIZE); |
14cae324 | 810 | if (rc) { |
f96637be JP |
811 | cifs_dbg(VFS, "%s: Could not set response as a key\n", |
812 | __func__); | |
14cae324 SP |
813 | return rc; |
814 | } | |
d2b91521 SP |
815 | |
816 | sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE); | |
d3686d54 | 817 | sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); |
d2b91521 SP |
818 | |
819 | rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE); | |
820 | if (rc) { | |
f96637be | 821 | cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc); |
d2b91521 SP |
822 | crypto_free_blkcipher(tfm_arc4); |
823 | return rc; | |
824 | } | |
825 | ||
826 | /* make secondary_key/nonce as session key */ | |
827 | memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE); | |
828 | /* and make len as that of session key only */ | |
829 | ses->auth_key.len = CIFS_SESS_KEY_SIZE; | |
830 | ||
831 | crypto_free_blkcipher(tfm_arc4); | |
832 | ||
14cae324 | 833 | return rc; |
d2b91521 SP |
834 | } |
835 | ||
836 | void | |
837 | cifs_crypto_shash_release(struct TCP_Server_Info *server) | |
838 | { | |
95dc8dd1 | 839 | if (server->secmech.cmacaes) { |
429b46f4 | 840 | crypto_free_shash(server->secmech.cmacaes); |
95dc8dd1 SF |
841 | server->secmech.cmacaes = NULL; |
842 | } | |
429b46f4 | 843 | |
95dc8dd1 | 844 | if (server->secmech.hmacsha256) { |
3c1bf7e4 | 845 | crypto_free_shash(server->secmech.hmacsha256); |
95dc8dd1 SF |
846 | server->secmech.hmacsha256 = NULL; |
847 | } | |
3c1bf7e4 | 848 | |
95dc8dd1 | 849 | if (server->secmech.md5) { |
d2b91521 | 850 | crypto_free_shash(server->secmech.md5); |
95dc8dd1 SF |
851 | server->secmech.md5 = NULL; |
852 | } | |
d2b91521 | 853 | |
95dc8dd1 | 854 | if (server->secmech.hmacmd5) { |
d2b91521 | 855 | crypto_free_shash(server->secmech.hmacmd5); |
95dc8dd1 SF |
856 | server->secmech.hmacmd5 = NULL; |
857 | } | |
d2b91521 | 858 | |
429b46f4 | 859 | kfree(server->secmech.sdesccmacaes); |
95dc8dd1 | 860 | server->secmech.sdesccmacaes = NULL; |
3c1bf7e4 | 861 | kfree(server->secmech.sdeschmacsha256); |
95dc8dd1 | 862 | server->secmech.sdeschmacsha256 = NULL; |
d2b91521 | 863 | kfree(server->secmech.sdeschmacmd5); |
95dc8dd1 | 864 | server->secmech.sdeschmacmd5 = NULL; |
d2b91521 | 865 | kfree(server->secmech.sdescmd5); |
95dc8dd1 | 866 | server->secmech.sdescmd5 = NULL; |
d2b91521 | 867 | } |