Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/cifsencrypt.c | |
3 | * | |
12b3b8ff | 4 | * Copyright (C) International Business Machines Corp., 2005,2006 |
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 | |
157c2491 JL |
34 | /* |
35 | * Calculate and return the CIFS signature based on the mac key and SMB PDU. | |
36 | * The 16 byte signature must be allocated by the caller. Note we only use the | |
37 | * 1st eight bytes and that the smb header signature field on input contains | |
38 | * the sequence number before this function is called. Also, this function | |
39 | * should be called with the server->srv_mutex held. | |
40 | */ | |
bf5ea0e2 | 41 | static int cifs_calc_signature(struct smb_rqst *rqst, |
826a95e4 | 42 | struct TCP_Server_Info *server, char *signature) |
84afc29b | 43 | { |
e9917a00 | 44 | int i; |
307fbd31 | 45 | int rc; |
bf5ea0e2 JL |
46 | struct kvec *iov = rqst->rq_iov; |
47 | int n_vec = rqst->rq_nvec; | |
84afc29b | 48 | |
21e73393 | 49 | if (iov == NULL || signature == NULL || server == NULL) |
e9917a00 | 50 | return -EINVAL; |
84afc29b | 51 | |
307fbd31 | 52 | if (!server->secmech.sdescmd5) { |
ac3aa2f8 | 53 | cERROR(1, "%s: Can't generate signature", __func__); |
307fbd31 SP |
54 | return -1; |
55 | } | |
56 | ||
57 | rc = crypto_shash_init(&server->secmech.sdescmd5->shash); | |
58 | if (rc) { | |
ac3aa2f8 | 59 | cERROR(1, "%s: Could not init md5", __func__); |
307fbd31 SP |
60 | return rc; |
61 | } | |
62 | ||
14cae324 | 63 | rc = crypto_shash_update(&server->secmech.sdescmd5->shash, |
307fbd31 | 64 | server->session_key.response, server->session_key.len); |
14cae324 | 65 | if (rc) { |
ac3aa2f8 | 66 | cERROR(1, "%s: Could not update with response", __func__); |
14cae324 SP |
67 | return rc; |
68 | } | |
307fbd31 | 69 | |
50c2f753 | 70 | for (i = 0; i < n_vec; i++) { |
745542e2 JL |
71 | if (iov[i].iov_len == 0) |
72 | continue; | |
ffdd6e4d | 73 | if (iov[i].iov_base == NULL) { |
56234e27 | 74 | cERROR(1, "null iovec entry"); |
e9917a00 | 75 | return -EIO; |
745542e2 | 76 | } |
ffdd6e4d | 77 | /* The first entry includes a length field (which does not get |
e9917a00 | 78 | signed that occupies the first 4 bytes before the header */ |
ffdd6e4d | 79 | if (i == 0) { |
63d2583f | 80 | if (iov[0].iov_len <= 8) /* cmd field at offset 9 */ |
e9917a00 | 81 | break; /* nothing to sign or corrupt header */ |
14cae324 | 82 | rc = |
307fbd31 SP |
83 | crypto_shash_update(&server->secmech.sdescmd5->shash, |
84 | iov[i].iov_base + 4, iov[i].iov_len - 4); | |
14cae324 SP |
85 | } else { |
86 | rc = | |
307fbd31 SP |
87 | crypto_shash_update(&server->secmech.sdescmd5->shash, |
88 | iov[i].iov_base, iov[i].iov_len); | |
14cae324 SP |
89 | } |
90 | if (rc) { | |
ac3aa2f8 | 91 | cERROR(1, "%s: Could not update with payload", |
14cae324 SP |
92 | __func__); |
93 | return rc; | |
94 | } | |
e9917a00 | 95 | } |
84afc29b | 96 | |
fb308a6f JL |
97 | /* now hash over the rq_pages array */ |
98 | for (i = 0; i < rqst->rq_npages; i++) { | |
99 | struct kvec p_iov; | |
100 | ||
101 | cifs_rqst_page_to_kvec(rqst, i, &p_iov); | |
102 | crypto_shash_update(&server->secmech.sdescmd5->shash, | |
103 | p_iov.iov_base, p_iov.iov_len); | |
104 | kunmap(rqst->rq_pages[i]); | |
105 | } | |
106 | ||
307fbd31 | 107 | rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature); |
14cae324 | 108 | if (rc) |
ac3aa2f8 | 109 | cERROR(1, "%s: Could not generate md5 hash", __func__); |
84afc29b | 110 | |
307fbd31 | 111 | return rc; |
84afc29b SF |
112 | } |
113 | ||
a0f8b4fb | 114 | /* must be called with server->srv_mutex held */ |
bf5ea0e2 | 115 | int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server, |
63d2583f | 116 | __u32 *pexpected_response_sequence_number) |
84afc29b SF |
117 | { |
118 | int rc = 0; | |
119 | char smb_signature[20]; | |
bf5ea0e2 | 120 | struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
84afc29b | 121 | |
ffdd6e4d | 122 | if ((cifs_pdu == NULL) || (server == NULL)) |
84afc29b SF |
123 | return -EINVAL; |
124 | ||
998d6fcb JL |
125 | if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) || |
126 | server->tcpStatus == CifsNeedNegotiate) | |
84afc29b SF |
127 | return rc; |
128 | ||
998d6fcb | 129 | if (!server->session_estab) { |
b4dacbc2 | 130 | memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8); |
998d6fcb JL |
131 | return rc; |
132 | } | |
133 | ||
ffdd6e4d | 134 | cifs_pdu->Signature.Sequence.SequenceNumber = |
84afc29b | 135 | cpu_to_le32(server->sequence_number); |
ffdd6e4d | 136 | cifs_pdu->Signature.Sequence.Reserved = 0; |
84afc29b | 137 | |
ffdd6e4d SF |
138 | *pexpected_response_sequence_number = server->sequence_number++; |
139 | server->sequence_number++; | |
84afc29b | 140 | |
bf5ea0e2 | 141 | rc = cifs_calc_signature(rqst, server, smb_signature); |
ffdd6e4d SF |
142 | if (rc) |
143 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |
144 | else | |
145 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
84afc29b | 146 | |
ffdd6e4d | 147 | return rc; |
84afc29b SF |
148 | } |
149 | ||
bf5ea0e2 JL |
150 | int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server, |
151 | __u32 *pexpected_response_sequence) | |
152 | { | |
153 | struct smb_rqst rqst = { .rq_iov = iov, | |
154 | .rq_nvec = n_vec }; | |
155 | ||
156 | return cifs_sign_rqst(&rqst, server, pexpected_response_sequence); | |
157 | } | |
158 | ||
826a95e4 JL |
159 | /* must be called with server->srv_mutex held */ |
160 | int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server, | |
161 | __u32 *pexpected_response_sequence_number) | |
162 | { | |
163 | struct kvec iov; | |
164 | ||
165 | iov.iov_base = cifs_pdu; | |
166 | iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4; | |
167 | ||
762a4206 | 168 | return cifs_sign_smbv(&iov, 1, server, |
826a95e4 JL |
169 | pexpected_response_sequence_number); |
170 | } | |
171 | ||
bf5ea0e2 | 172 | int cifs_verify_signature(struct smb_rqst *rqst, |
21e73393 | 173 | struct TCP_Server_Info *server, |
ffdd6e4d | 174 | __u32 expected_sequence_number) |
1da177e4 | 175 | { |
c8e56f1f | 176 | unsigned int rc; |
1da177e4 LT |
177 | char server_response_sig[8]; |
178 | char what_we_think_sig_should_be[20]; | |
bf5ea0e2 | 179 | struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
1da177e4 | 180 | |
21e73393 | 181 | if (cifs_pdu == NULL || server == NULL) |
1da177e4 LT |
182 | return -EINVAL; |
183 | ||
9c4843ea | 184 | if (!server->session_estab) |
1da177e4 LT |
185 | return 0; |
186 | ||
187 | if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) { | |
50c2f753 | 188 | struct smb_com_lock_req *pSMB = |
ffdd6e4d SF |
189 | (struct smb_com_lock_req *)cifs_pdu; |
190 | if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) | |
1da177e4 LT |
191 | return 0; |
192 | } | |
193 | ||
50c2f753 SF |
194 | /* BB what if signatures are supposed to be on for session but |
195 | server does not send one? BB */ | |
196 | ||
1da177e4 | 197 | /* Do not need to verify session setups with signature "BSRSPYL " */ |
50c2f753 | 198 | if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0) |
b6b38f70 JP |
199 | cFYI(1, "dummy signature received for smb command 0x%x", |
200 | cifs_pdu->Command); | |
1da177e4 LT |
201 | |
202 | /* save off the origiginal signature so we can modify the smb and check | |
203 | its signature against what the server sent */ | |
50c2f753 | 204 | memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8); |
1da177e4 | 205 | |
50c2f753 SF |
206 | cifs_pdu->Signature.Sequence.SequenceNumber = |
207 | cpu_to_le32(expected_sequence_number); | |
1da177e4 LT |
208 | cifs_pdu->Signature.Sequence.Reserved = 0; |
209 | ||
157c2491 | 210 | mutex_lock(&server->srv_mutex); |
bf5ea0e2 | 211 | rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be); |
157c2491 | 212 | mutex_unlock(&server->srv_mutex); |
1da177e4 | 213 | |
50c2f753 | 214 | if (rc) |
1da177e4 LT |
215 | return rc; |
216 | ||
50c2f753 SF |
217 | /* cifs_dump_mem("what we think it should be: ", |
218 | what_we_think_sig_should_be, 16); */ | |
1da177e4 | 219 | |
50c2f753 | 220 | if (memcmp(server_response_sig, what_we_think_sig_should_be, 8)) |
1da177e4 LT |
221 | return -EACCES; |
222 | else | |
223 | return 0; | |
224 | ||
225 | } | |
226 | ||
21e73393 | 227 | /* first calculate 24 bytes ntlm response and then 16 byte session key */ |
9ef5992e | 228 | int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp) |
1da177e4 | 229 | { |
ee2c9258 | 230 | int rc = 0; |
21e73393 SP |
231 | unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE; |
232 | char temp_key[CIFS_SESS_KEY_SIZE]; | |
233 | ||
234 | if (!ses) | |
1da177e4 LT |
235 | return -EINVAL; |
236 | ||
21e73393 SP |
237 | ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL); |
238 | if (!ses->auth_key.response) { | |
239 | cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len); | |
240 | return -ENOMEM; | |
241 | } | |
242 | ses->auth_key.len = temp_len; | |
243 | ||
ee2c9258 | 244 | rc = SMBNTencrypt(ses->password, ses->server->cryptkey, |
9ef5992e | 245 | ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp); |
ee2c9258 SP |
246 | if (rc) { |
247 | cFYI(1, "%s Can't generate NTLM response, error: %d", | |
248 | __func__, rc); | |
249 | return rc; | |
250 | } | |
251 | ||
9ef5992e | 252 | rc = E_md4hash(ses->password, temp_key, nls_cp); |
ee2c9258 SP |
253 | if (rc) { |
254 | cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc); | |
255 | return rc; | |
256 | } | |
21e73393 | 257 | |
ee2c9258 SP |
258 | rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE); |
259 | if (rc) | |
260 | cFYI(1, "%s Can't generate NTLM session key, error: %d", | |
261 | __func__, rc); | |
21e73393 | 262 | |
ee2c9258 | 263 | return rc; |
1da177e4 LT |
264 | } |
265 | ||
7c7b25bc | 266 | #ifdef CONFIG_CIFS_WEAK_PW_HASH |
43988d76 | 267 | int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt, |
4e53a3fb | 268 | char *lnm_session_key) |
7c7b25bc SF |
269 | { |
270 | int i; | |
43988d76 | 271 | int rc; |
7c7b25bc SF |
272 | char password_with_pad[CIFS_ENCPWD_SIZE]; |
273 | ||
274 | memset(password_with_pad, 0, CIFS_ENCPWD_SIZE); | |
4e53a3fb JL |
275 | if (password) |
276 | strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE); | |
277 | ||
04912d6a | 278 | if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) { |
4e53a3fb JL |
279 | memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE); |
280 | memcpy(lnm_session_key, password_with_pad, | |
281 | CIFS_ENCPWD_SIZE); | |
43988d76 | 282 | return 0; |
4e53a3fb | 283 | } |
bdc4bf6e | 284 | |
7c7b25bc SF |
285 | /* calculate old style session key */ |
286 | /* calling toupper is less broken than repeatedly | |
287 | calling nls_toupper would be since that will never | |
288 | work for UTF8, but neither handles multibyte code pages | |
289 | but the only alternative would be converting to UCS-16 (Unicode) | |
290 | (using a routine something like UniStrupr) then | |
291 | uppercasing and then converting back from Unicode - which | |
292 | would only worth doing it if we knew it were utf8. Basically | |
293 | utf8 and other multibyte codepages each need their own strupper | |
294 | function since a byte at a time will ont work. */ | |
295 | ||
ef571cad | 296 | for (i = 0; i < CIFS_ENCPWD_SIZE; i++) |
7c7b25bc | 297 | password_with_pad[i] = toupper(password_with_pad[i]); |
7c7b25bc | 298 | |
43988d76 | 299 | rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key); |
4e53a3fb | 300 | |
43988d76 | 301 | return rc; |
7c7b25bc SF |
302 | } |
303 | #endif /* CIFS_WEAK_PW_HASH */ | |
304 | ||
9daa42e2 SP |
305 | /* Build a proper attribute value/target info pairs blob. |
306 | * Fill in netbios and dns domain name and workstation name | |
307 | * and client time (total five av pairs and + one end of fields indicator. | |
308 | * Allocate domain name which gets freed when session struct is deallocated. | |
2b149f11 SP |
309 | */ |
310 | static int | |
96daf2b0 | 311 | build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 | 312 | { |
9daa42e2 | 313 | unsigned int dlen; |
cfbd6f84 | 314 | unsigned int size = 2 * sizeof(struct ntlmssp2_name); |
9daa42e2 SP |
315 | char *defdmname = "WORKGROUP"; |
316 | unsigned char *blobptr; | |
2b149f11 SP |
317 | struct ntlmssp2_name *attrptr; |
318 | ||
9daa42e2 SP |
319 | if (!ses->domainName) { |
320 | ses->domainName = kstrdup(defdmname, GFP_KERNEL); | |
321 | if (!ses->domainName) | |
322 | return -ENOMEM; | |
323 | } | |
324 | ||
325 | dlen = strlen(ses->domainName); | |
9daa42e2 | 326 | |
cfbd6f84 SP |
327 | /* |
328 | * The length of this blob is two times the size of a | |
329 | * structure (av pair) which holds name/size | |
330 | * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) + | |
331 | * unicode length of a netbios domain name | |
9daa42e2 | 332 | */ |
cfbd6f84 | 333 | ses->auth_key.len = size + 2 * dlen; |
d3686d54 SP |
334 | ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL); |
335 | if (!ses->auth_key.response) { | |
336 | ses->auth_key.len = 0; | |
2b149f11 SP |
337 | cERROR(1, "Challenge target info allocation failure"); |
338 | return -ENOMEM; | |
339 | } | |
9daa42e2 | 340 | |
d3686d54 | 341 | blobptr = ses->auth_key.response; |
9daa42e2 SP |
342 | attrptr = (struct ntlmssp2_name *) blobptr; |
343 | ||
cfbd6f84 SP |
344 | /* |
345 | * As defined in MS-NTLM 3.3.2, just this av pair field | |
346 | * is sufficient as part of the temp | |
347 | */ | |
9daa42e2 SP |
348 | attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME); |
349 | attrptr->length = cpu_to_le16(2 * dlen); | |
350 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
acbbb76a | 351 | cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp); |
9daa42e2 | 352 | |
2b149f11 SP |
353 | return 0; |
354 | } | |
355 | ||
356 | /* Server has provided av pairs/target info in the type 2 challenge | |
357 | * packet and we have plucked it and stored within smb session. | |
358 | * We parse that blob here to find netbios domain name to be used | |
359 | * as part of ntlmv2 authentication (in Target String), if not already | |
360 | * specified on the command line. | |
361 | * If this function returns without any error but without fetching | |
362 | * domain name, authentication may fail against some server but | |
363 | * may not fail against other (those who are not very particular | |
364 | * about target string i.e. for some, just user name might suffice. | |
365 | */ | |
366 | static int | |
96daf2b0 | 367 | find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 SP |
368 | { |
369 | unsigned int attrsize; | |
370 | unsigned int type; | |
371 | unsigned int onesize = sizeof(struct ntlmssp2_name); | |
372 | unsigned char *blobptr; | |
373 | unsigned char *blobend; | |
374 | struct ntlmssp2_name *attrptr; | |
375 | ||
d3686d54 | 376 | if (!ses->auth_key.len || !ses->auth_key.response) |
2b149f11 SP |
377 | return 0; |
378 | ||
d3686d54 SP |
379 | blobptr = ses->auth_key.response; |
380 | blobend = blobptr + ses->auth_key.len; | |
2b149f11 SP |
381 | |
382 | while (blobptr + onesize < blobend) { | |
383 | attrptr = (struct ntlmssp2_name *) blobptr; | |
384 | type = le16_to_cpu(attrptr->type); | |
385 | if (type == NTLMSSP_AV_EOL) | |
386 | break; | |
387 | blobptr += 2; /* advance attr type */ | |
388 | attrsize = le16_to_cpu(attrptr->length); | |
389 | blobptr += 2; /* advance attr size */ | |
390 | if (blobptr + attrsize > blobend) | |
391 | break; | |
392 | if (type == NTLMSSP_AV_NB_DOMAIN_NAME) { | |
393 | if (!attrsize) | |
394 | break; | |
395 | if (!ses->domainName) { | |
396 | ses->domainName = | |
397 | kmalloc(attrsize + 1, GFP_KERNEL); | |
398 | if (!ses->domainName) | |
399 | return -ENOMEM; | |
acbbb76a | 400 | cifs_from_utf16(ses->domainName, |
2b149f11 | 401 | (__le16 *)blobptr, attrsize, attrsize, |
f7c5445a | 402 | nls_cp, false); |
2b149f11 SP |
403 | break; |
404 | } | |
405 | } | |
406 | blobptr += attrsize; /* advance attr value */ | |
407 | } | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
96daf2b0 | 412 | static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash, |
50c2f753 | 413 | const struct nls_table *nls_cp) |
a8ee0344 SF |
414 | { |
415 | int rc = 0; | |
416 | int len; | |
307fbd31 | 417 | char nt_hash[CIFS_NTHASH_SIZE]; |
50c2f753 SF |
418 | wchar_t *user; |
419 | wchar_t *domain; | |
307fbd31 | 420 | wchar_t *server; |
a8ee0344 | 421 | |
307fbd31 | 422 | if (!ses->server->secmech.sdeschmacmd5) { |
ac3aa2f8 | 423 | cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash"); |
307fbd31 SP |
424 | return -1; |
425 | } | |
56234e27 | 426 | |
c8e56f1f | 427 | /* calculate md4 hash of password */ |
9ef5992e | 428 | E_md4hash(ses->password, nt_hash, nls_cp); |
9fbc5908 | 429 | |
14cae324 | 430 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash, |
307fbd31 | 431 | CIFS_NTHASH_SIZE); |
14cae324 SP |
432 | if (rc) { |
433 | cERROR(1, "%s: Could not set NT Hash as a key", __func__); | |
434 | return rc; | |
435 | } | |
307fbd31 SP |
436 | |
437 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
438 | if (rc) { | |
ac3aa2f8 | 439 | cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5"); |
307fbd31 SP |
440 | return rc; |
441 | } | |
a8ee0344 | 442 | |
8727c8a8 | 443 | /* convert ses->user_name to unicode and uppercase */ |
04febabc | 444 | len = ses->user_name ? strlen(ses->user_name) : 0; |
1717ffc5 | 445 | user = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 446 | if (user == NULL) { |
ac3aa2f8 | 447 | cERROR(1, "calc_ntlmv2_hash: user mem alloc failure"); |
307fbd31 | 448 | rc = -ENOMEM; |
14cae324 | 449 | return rc; |
307fbd31 | 450 | } |
04febabc JL |
451 | |
452 | if (len) { | |
acbbb76a | 453 | len = cifs_strtoUTF16((__le16 *)user, ses->user_name, len, nls_cp); |
04febabc JL |
454 | UniStrupr(user); |
455 | } else { | |
456 | memset(user, '\0', 2); | |
457 | } | |
307fbd31 | 458 | |
14cae324 | 459 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 | 460 | (char *)user, 2 * len); |
14cae324 SP |
461 | kfree(user); |
462 | if (rc) { | |
ac3aa2f8 | 463 | cERROR(1, "%s: Could not update with user", __func__); |
14cae324 SP |
464 | return rc; |
465 | } | |
a8ee0344 SF |
466 | |
467 | /* convert ses->domainName to unicode and uppercase */ | |
50c2f753 | 468 | if (ses->domainName) { |
1717ffc5 | 469 | len = strlen(ses->domainName); |
a8ee0344 | 470 | |
50c2f753 | 471 | domain = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 SP |
472 | if (domain == NULL) { |
473 | cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure"); | |
474 | rc = -ENOMEM; | |
14cae324 | 475 | return rc; |
307fbd31 | 476 | } |
acbbb76a SF |
477 | len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len, |
478 | nls_cp); | |
14cae324 | 479 | rc = |
307fbd31 SP |
480 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
481 | (char *)domain, 2 * len); | |
1717ffc5 | 482 | kfree(domain); |
14cae324 | 483 | if (rc) { |
ac3aa2f8 | 484 | cERROR(1, "%s: Could not update with domain", |
14cae324 SP |
485 | __func__); |
486 | return rc; | |
487 | } | |
307fbd31 SP |
488 | } else if (ses->serverName) { |
489 | len = strlen(ses->serverName); | |
490 | ||
491 | server = kmalloc(2 + (len * 2), GFP_KERNEL); | |
492 | if (server == NULL) { | |
493 | cERROR(1, "calc_ntlmv2_hash: server mem alloc failure"); | |
494 | rc = -ENOMEM; | |
14cae324 | 495 | return rc; |
307fbd31 | 496 | } |
acbbb76a | 497 | len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len, |
307fbd31 | 498 | nls_cp); |
14cae324 | 499 | rc = |
307fbd31 SP |
500 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
501 | (char *)server, 2 * len); | |
502 | kfree(server); | |
14cae324 | 503 | if (rc) { |
ac3aa2f8 | 504 | cERROR(1, "%s: Could not update with server", |
14cae324 SP |
505 | __func__); |
506 | return rc; | |
507 | } | |
1717ffc5 | 508 | } |
307fbd31 SP |
509 | |
510 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
d3686d54 | 511 | ntlmv2_hash); |
14cae324 | 512 | if (rc) |
ac3aa2f8 | 513 | cERROR(1, "%s: Could not generate md5 hash", __func__); |
307fbd31 | 514 | |
307fbd31 SP |
515 | return rc; |
516 | } | |
517 | ||
518 | static int | |
96daf2b0 | 519 | CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash) |
307fbd31 SP |
520 | { |
521 | int rc; | |
522 | unsigned int offset = CIFS_SESS_KEY_SIZE + 8; | |
523 | ||
524 | if (!ses->server->secmech.sdeschmacmd5) { | |
ac3aa2f8 | 525 | cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash"); |
307fbd31 SP |
526 | return -1; |
527 | } | |
528 | ||
14cae324 | 529 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
d3686d54 | 530 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 SP |
531 | if (rc) { |
532 | cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__); | |
533 | return rc; | |
534 | } | |
307fbd31 SP |
535 | |
536 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
537 | if (rc) { | |
538 | cERROR(1, "CalcNTLMv2_response: could not init hmacmd5"); | |
539 | return rc; | |
540 | } | |
541 | ||
d3ba50b1 SP |
542 | if (ses->server->secType == RawNTLMSSP) |
543 | memcpy(ses->auth_key.response + offset, | |
d3686d54 | 544 | ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); |
d3ba50b1 SP |
545 | else |
546 | memcpy(ses->auth_key.response + offset, | |
547 | ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); | |
14cae324 | 548 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 | 549 | ses->auth_key.response + offset, ses->auth_key.len - offset); |
14cae324 | 550 | if (rc) { |
ac3aa2f8 | 551 | cERROR(1, "%s: Could not update with response", __func__); |
14cae324 SP |
552 | return rc; |
553 | } | |
307fbd31 SP |
554 | |
555 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
556 | ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
14cae324 | 557 | if (rc) |
ac3aa2f8 | 558 | cERROR(1, "%s: Could not generate md5 hash", __func__); |
9fbc5908 SF |
559 | |
560 | return rc; | |
561 | } | |
562 | ||
307fbd31 | 563 | |
2b149f11 | 564 | int |
96daf2b0 | 565 | setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp) |
9fbc5908 | 566 | { |
c8e56f1f | 567 | int rc; |
21e73393 | 568 | int baselen; |
d3686d54 | 569 | unsigned int tilen; |
21e73393 | 570 | struct ntlmv2_resp *buf; |
d3686d54 SP |
571 | char ntlmv2_hash[16]; |
572 | unsigned char *tiblob = NULL; /* target info blob */ | |
6d027cfd | 573 | |
2b149f11 SP |
574 | if (ses->server->secType == RawNTLMSSP) { |
575 | if (!ses->domainName) { | |
f7c5445a | 576 | rc = find_domain_name(ses, nls_cp); |
2b149f11 SP |
577 | if (rc) { |
578 | cERROR(1, "error %d finding domain name", rc); | |
579 | goto setup_ntlmv2_rsp_ret; | |
580 | } | |
581 | } | |
582 | } else { | |
9daa42e2 | 583 | rc = build_avpair_blob(ses, nls_cp); |
2b149f11 SP |
584 | if (rc) { |
585 | cERROR(1, "error %d building av pair blob", rc); | |
d3686d54 | 586 | goto setup_ntlmv2_rsp_ret; |
2b149f11 SP |
587 | } |
588 | } | |
a8ee0344 | 589 | |
21e73393 | 590 | baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp); |
d3686d54 SP |
591 | tilen = ses->auth_key.len; |
592 | tiblob = ses->auth_key.response; | |
593 | ||
594 | ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL); | |
21e73393 SP |
595 | if (!ses->auth_key.response) { |
596 | rc = ENOMEM; | |
d3686d54 | 597 | ses->auth_key.len = 0; |
21e73393 SP |
598 | cERROR(1, "%s: Can't allocate auth blob", __func__); |
599 | goto setup_ntlmv2_rsp_ret; | |
600 | } | |
d3686d54 | 601 | ses->auth_key.len += baselen; |
21e73393 SP |
602 | |
603 | buf = (struct ntlmv2_resp *) | |
604 | (ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
605 | buf->blob_signature = cpu_to_le32(0x00000101); | |
606 | buf->reserved = 0; | |
607 | buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME)); | |
608 | get_random_bytes(&buf->client_chal, sizeof(buf->client_chal)); | |
609 | buf->reserved2 = 0; | |
610 | ||
d3686d54 | 611 | memcpy(ses->auth_key.response + baselen, tiblob, tilen); |
21e73393 | 612 | |
f7c5445a | 613 | /* calculate ntlmv2_hash */ |
d3686d54 | 614 | rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp); |
2b149f11 | 615 | if (rc) { |
b6b38f70 | 616 | cERROR(1, "could not get v2 hash rc %d", rc); |
2b149f11 SP |
617 | goto setup_ntlmv2_rsp_ret; |
618 | } | |
f7c5445a SP |
619 | |
620 | /* calculate first part of the client response (CR1) */ | |
d3686d54 | 621 | rc = CalcNTLMv2_response(ses, ntlmv2_hash); |
307fbd31 SP |
622 | if (rc) { |
623 | cERROR(1, "Could not calculate CR1 rc: %d", rc); | |
624 | goto setup_ntlmv2_rsp_ret; | |
625 | } | |
b609f06a | 626 | |
5d0d2882 | 627 | /* now calculate the session key for NTLMv2 */ |
14cae324 | 628 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
d3686d54 | 629 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 SP |
630 | if (rc) { |
631 | cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__); | |
632 | goto setup_ntlmv2_rsp_ret; | |
633 | } | |
307fbd31 SP |
634 | |
635 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
636 | if (rc) { | |
ac3aa2f8 | 637 | cERROR(1, "%s: Could not init hmacmd5", __func__); |
307fbd31 SP |
638 | goto setup_ntlmv2_rsp_ret; |
639 | } | |
640 | ||
14cae324 | 641 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 SP |
642 | ses->auth_key.response + CIFS_SESS_KEY_SIZE, |
643 | CIFS_HMAC_MD5_HASH_SIZE); | |
14cae324 | 644 | if (rc) { |
ac3aa2f8 | 645 | cERROR(1, "%s: Could not update with response", __func__); |
14cae324 SP |
646 | goto setup_ntlmv2_rsp_ret; |
647 | } | |
307fbd31 SP |
648 | |
649 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
650 | ses->auth_key.response); | |
14cae324 | 651 | if (rc) |
ac3aa2f8 | 652 | cERROR(1, "%s: Could not generate md5 hash", __func__); |
2b149f11 | 653 | |
2b149f11 | 654 | setup_ntlmv2_rsp_ret: |
d3686d54 | 655 | kfree(tiblob); |
2b149f11 SP |
656 | |
657 | return rc; | |
6d027cfd SF |
658 | } |
659 | ||
d2b91521 | 660 | int |
96daf2b0 | 661 | calc_seckey(struct cifs_ses *ses) |
d2b91521 SP |
662 | { |
663 | int rc; | |
664 | struct crypto_blkcipher *tfm_arc4; | |
665 | struct scatterlist sgin, sgout; | |
666 | struct blkcipher_desc desc; | |
667 | unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */ | |
668 | ||
669 | get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE); | |
670 | ||
671 | tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC); | |
7a8587e7 SP |
672 | if (IS_ERR(tfm_arc4)) { |
673 | rc = PTR_ERR(tfm_arc4); | |
ac3aa2f8 | 674 | cERROR(1, "could not allocate crypto API arc4"); |
7a8587e7 | 675 | return rc; |
d2b91521 SP |
676 | } |
677 | ||
678 | desc.tfm = tfm_arc4; | |
679 | ||
14cae324 | 680 | rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response, |
d2b91521 | 681 | CIFS_SESS_KEY_SIZE); |
14cae324 SP |
682 | if (rc) { |
683 | cERROR(1, "%s: Could not set response as a key", __func__); | |
684 | return rc; | |
685 | } | |
d2b91521 SP |
686 | |
687 | sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE); | |
d3686d54 | 688 | sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); |
d2b91521 SP |
689 | |
690 | rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE); | |
691 | if (rc) { | |
ac3aa2f8 | 692 | cERROR(1, "could not encrypt session key rc: %d", rc); |
d2b91521 SP |
693 | crypto_free_blkcipher(tfm_arc4); |
694 | return rc; | |
695 | } | |
696 | ||
697 | /* make secondary_key/nonce as session key */ | |
698 | memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE); | |
699 | /* and make len as that of session key only */ | |
700 | ses->auth_key.len = CIFS_SESS_KEY_SIZE; | |
701 | ||
702 | crypto_free_blkcipher(tfm_arc4); | |
703 | ||
14cae324 | 704 | return rc; |
d2b91521 SP |
705 | } |
706 | ||
707 | void | |
708 | cifs_crypto_shash_release(struct TCP_Server_Info *server) | |
709 | { | |
3c1bf7e4 PS |
710 | if (server->secmech.hmacsha256) |
711 | crypto_free_shash(server->secmech.hmacsha256); | |
712 | ||
d2b91521 SP |
713 | if (server->secmech.md5) |
714 | crypto_free_shash(server->secmech.md5); | |
715 | ||
716 | if (server->secmech.hmacmd5) | |
717 | crypto_free_shash(server->secmech.hmacmd5); | |
718 | ||
3c1bf7e4 PS |
719 | kfree(server->secmech.sdeschmacsha256); |
720 | ||
d2b91521 SP |
721 | kfree(server->secmech.sdeschmacmd5); |
722 | ||
723 | kfree(server->secmech.sdescmd5); | |
724 | } | |
725 | ||
726 | int | |
727 | cifs_crypto_shash_allocate(struct TCP_Server_Info *server) | |
728 | { | |
729 | int rc; | |
730 | unsigned int size; | |
731 | ||
732 | server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0); | |
ee2c9258 | 733 | if (IS_ERR(server->secmech.hmacmd5)) { |
ac3aa2f8 | 734 | cERROR(1, "could not allocate crypto hmacmd5"); |
d2b91521 SP |
735 | return PTR_ERR(server->secmech.hmacmd5); |
736 | } | |
737 | ||
738 | server->secmech.md5 = crypto_alloc_shash("md5", 0, 0); | |
ee2c9258 | 739 | if (IS_ERR(server->secmech.md5)) { |
ac3aa2f8 | 740 | cERROR(1, "could not allocate crypto md5"); |
d2b91521 SP |
741 | rc = PTR_ERR(server->secmech.md5); |
742 | goto crypto_allocate_md5_fail; | |
743 | } | |
744 | ||
3c1bf7e4 PS |
745 | server->secmech.hmacsha256 = crypto_alloc_shash("hmac(sha256)", 0, 0); |
746 | if (IS_ERR(server->secmech.hmacsha256)) { | |
747 | cERROR(1, "could not allocate crypto hmacsha256\n"); | |
748 | rc = PTR_ERR(server->secmech.hmacsha256); | |
749 | goto crypto_allocate_hmacsha256_fail; | |
750 | } | |
751 | ||
d2b91521 SP |
752 | size = sizeof(struct shash_desc) + |
753 | crypto_shash_descsize(server->secmech.hmacmd5); | |
754 | server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL); | |
755 | if (!server->secmech.sdeschmacmd5) { | |
ac3aa2f8 | 756 | cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5"); |
d2b91521 SP |
757 | rc = -ENOMEM; |
758 | goto crypto_allocate_hmacmd5_sdesc_fail; | |
759 | } | |
760 | server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5; | |
761 | server->secmech.sdeschmacmd5->shash.flags = 0x0; | |
762 | ||
d2b91521 SP |
763 | size = sizeof(struct shash_desc) + |
764 | crypto_shash_descsize(server->secmech.md5); | |
765 | server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL); | |
766 | if (!server->secmech.sdescmd5) { | |
ac3aa2f8 | 767 | cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5"); |
d2b91521 SP |
768 | rc = -ENOMEM; |
769 | goto crypto_allocate_md5_sdesc_fail; | |
770 | } | |
771 | server->secmech.sdescmd5->shash.tfm = server->secmech.md5; | |
772 | server->secmech.sdescmd5->shash.flags = 0x0; | |
773 | ||
3c1bf7e4 PS |
774 | size = sizeof(struct shash_desc) + |
775 | crypto_shash_descsize(server->secmech.hmacsha256); | |
776 | server->secmech.sdeschmacsha256 = kmalloc(size, GFP_KERNEL); | |
777 | if (!server->secmech.sdeschmacsha256) { | |
778 | cERROR(1, "%s: Can't alloc hmacsha256\n", __func__); | |
779 | rc = -ENOMEM; | |
780 | goto crypto_allocate_hmacsha256_sdesc_fail; | |
781 | } | |
782 | server->secmech.sdeschmacsha256->shash.tfm = server->secmech.hmacsha256; | |
783 | server->secmech.sdeschmacsha256->shash.flags = 0x0; | |
784 | ||
d2b91521 SP |
785 | return 0; |
786 | ||
3c1bf7e4 PS |
787 | crypto_allocate_hmacsha256_sdesc_fail: |
788 | kfree(server->secmech.sdescmd5); | |
789 | ||
d2b91521 SP |
790 | crypto_allocate_md5_sdesc_fail: |
791 | kfree(server->secmech.sdeschmacmd5); | |
792 | ||
793 | crypto_allocate_hmacmd5_sdesc_fail: | |
3c1bf7e4 PS |
794 | crypto_free_shash(server->secmech.hmacsha256); |
795 | ||
796 | crypto_allocate_hmacsha256_fail: | |
d2b91521 SP |
797 | crypto_free_shash(server->secmech.md5); |
798 | ||
799 | crypto_allocate_md5_fail: | |
800 | crypto_free_shash(server->secmech.hmacmd5); | |
801 | ||
802 | return rc; | |
803 | } |