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Commit | Line | Data |
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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) { |
f96637be | 53 | cifs_dbg(VFS, "%s: Can't generate signature\n", __func__); |
307fbd31 SP |
54 | return -1; |
55 | } | |
56 | ||
57 | rc = crypto_shash_init(&server->secmech.sdescmd5->shash); | |
58 | if (rc) { | |
f96637be | 59 | cifs_dbg(VFS, "%s: Could not init md5\n", __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) { |
f96637be | 66 | cifs_dbg(VFS, "%s: Could not update with response\n", __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) { |
f96637be | 74 | cifs_dbg(VFS, "null iovec entry\n"); |
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) { | |
f96637be JP |
91 | cifs_dbg(VFS, "%s: Could not update with payload\n", |
92 | __func__); | |
14cae324 SP |
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) |
f96637be | 109 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __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 | |
0124cc45 JL |
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) |
f96637be JP |
199 | cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n", |
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 | 237 | ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL); |
f96637be | 238 | if (!ses->auth_key.response) |
21e73393 | 239 | return -ENOMEM; |
f96637be | 240 | |
21e73393 SP |
241 | ses->auth_key.len = temp_len; |
242 | ||
ee2c9258 | 243 | rc = SMBNTencrypt(ses->password, ses->server->cryptkey, |
9ef5992e | 244 | ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp); |
ee2c9258 | 245 | if (rc) { |
f96637be JP |
246 | cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n", |
247 | __func__, rc); | |
ee2c9258 SP |
248 | return rc; |
249 | } | |
250 | ||
9ef5992e | 251 | rc = E_md4hash(ses->password, temp_key, nls_cp); |
ee2c9258 | 252 | if (rc) { |
f96637be JP |
253 | cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n", |
254 | __func__, rc); | |
ee2c9258 SP |
255 | return rc; |
256 | } | |
21e73393 | 257 | |
ee2c9258 SP |
258 | rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE); |
259 | if (rc) | |
f96637be JP |
260 | cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n", |
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 | return -ENOMEM; |
338 | } | |
9daa42e2 | 339 | |
d3686d54 | 340 | blobptr = ses->auth_key.response; |
9daa42e2 SP |
341 | attrptr = (struct ntlmssp2_name *) blobptr; |
342 | ||
cfbd6f84 SP |
343 | /* |
344 | * As defined in MS-NTLM 3.3.2, just this av pair field | |
345 | * is sufficient as part of the temp | |
346 | */ | |
9daa42e2 SP |
347 | attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME); |
348 | attrptr->length = cpu_to_le16(2 * dlen); | |
349 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
acbbb76a | 350 | cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp); |
9daa42e2 | 351 | |
2b149f11 SP |
352 | return 0; |
353 | } | |
354 | ||
355 | /* Server has provided av pairs/target info in the type 2 challenge | |
356 | * packet and we have plucked it and stored within smb session. | |
357 | * We parse that blob here to find netbios domain name to be used | |
358 | * as part of ntlmv2 authentication (in Target String), if not already | |
359 | * specified on the command line. | |
360 | * If this function returns without any error but without fetching | |
361 | * domain name, authentication may fail against some server but | |
362 | * may not fail against other (those who are not very particular | |
363 | * about target string i.e. for some, just user name might suffice. | |
364 | */ | |
365 | static int | |
96daf2b0 | 366 | find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 SP |
367 | { |
368 | unsigned int attrsize; | |
369 | unsigned int type; | |
370 | unsigned int onesize = sizeof(struct ntlmssp2_name); | |
371 | unsigned char *blobptr; | |
372 | unsigned char *blobend; | |
373 | struct ntlmssp2_name *attrptr; | |
374 | ||
d3686d54 | 375 | if (!ses->auth_key.len || !ses->auth_key.response) |
2b149f11 SP |
376 | return 0; |
377 | ||
d3686d54 SP |
378 | blobptr = ses->auth_key.response; |
379 | blobend = blobptr + ses->auth_key.len; | |
2b149f11 SP |
380 | |
381 | while (blobptr + onesize < blobend) { | |
382 | attrptr = (struct ntlmssp2_name *) blobptr; | |
383 | type = le16_to_cpu(attrptr->type); | |
384 | if (type == NTLMSSP_AV_EOL) | |
385 | break; | |
386 | blobptr += 2; /* advance attr type */ | |
387 | attrsize = le16_to_cpu(attrptr->length); | |
388 | blobptr += 2; /* advance attr size */ | |
389 | if (blobptr + attrsize > blobend) | |
390 | break; | |
391 | if (type == NTLMSSP_AV_NB_DOMAIN_NAME) { | |
392 | if (!attrsize) | |
393 | break; | |
394 | if (!ses->domainName) { | |
395 | ses->domainName = | |
396 | kmalloc(attrsize + 1, GFP_KERNEL); | |
397 | if (!ses->domainName) | |
398 | return -ENOMEM; | |
acbbb76a | 399 | cifs_from_utf16(ses->domainName, |
2b149f11 | 400 | (__le16 *)blobptr, attrsize, attrsize, |
f7c5445a | 401 | nls_cp, false); |
2b149f11 SP |
402 | break; |
403 | } | |
404 | } | |
405 | blobptr += attrsize; /* advance attr value */ | |
406 | } | |
407 | ||
408 | return 0; | |
409 | } | |
410 | ||
96daf2b0 | 411 | static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash, |
50c2f753 | 412 | const struct nls_table *nls_cp) |
a8ee0344 SF |
413 | { |
414 | int rc = 0; | |
415 | int len; | |
307fbd31 | 416 | char nt_hash[CIFS_NTHASH_SIZE]; |
50c2f753 SF |
417 | wchar_t *user; |
418 | wchar_t *domain; | |
307fbd31 | 419 | wchar_t *server; |
a8ee0344 | 420 | |
307fbd31 | 421 | if (!ses->server->secmech.sdeschmacmd5) { |
f96637be | 422 | cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); |
307fbd31 SP |
423 | return -1; |
424 | } | |
56234e27 | 425 | |
c8e56f1f | 426 | /* calculate md4 hash of password */ |
9ef5992e | 427 | E_md4hash(ses->password, nt_hash, nls_cp); |
9fbc5908 | 428 | |
14cae324 | 429 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash, |
307fbd31 | 430 | CIFS_NTHASH_SIZE); |
14cae324 | 431 | if (rc) { |
f96637be | 432 | cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__); |
14cae324 SP |
433 | return rc; |
434 | } | |
307fbd31 SP |
435 | |
436 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
437 | if (rc) { | |
f96637be | 438 | cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__); |
307fbd31 SP |
439 | return rc; |
440 | } | |
a8ee0344 | 441 | |
8727c8a8 | 442 | /* convert ses->user_name to unicode and uppercase */ |
04febabc | 443 | len = ses->user_name ? strlen(ses->user_name) : 0; |
1717ffc5 | 444 | user = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 445 | if (user == NULL) { |
307fbd31 | 446 | rc = -ENOMEM; |
14cae324 | 447 | return rc; |
307fbd31 | 448 | } |
04febabc JL |
449 | |
450 | if (len) { | |
acbbb76a | 451 | len = cifs_strtoUTF16((__le16 *)user, ses->user_name, len, nls_cp); |
04febabc JL |
452 | UniStrupr(user); |
453 | } else { | |
454 | memset(user, '\0', 2); | |
455 | } | |
307fbd31 | 456 | |
14cae324 | 457 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 | 458 | (char *)user, 2 * len); |
14cae324 SP |
459 | kfree(user); |
460 | if (rc) { | |
f96637be | 461 | cifs_dbg(VFS, "%s: Could not update with user\n", __func__); |
14cae324 SP |
462 | return rc; |
463 | } | |
a8ee0344 SF |
464 | |
465 | /* convert ses->domainName to unicode and uppercase */ | |
50c2f753 | 466 | if (ses->domainName) { |
1717ffc5 | 467 | len = strlen(ses->domainName); |
a8ee0344 | 468 | |
50c2f753 | 469 | domain = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 470 | if (domain == NULL) { |
307fbd31 | 471 | rc = -ENOMEM; |
14cae324 | 472 | return rc; |
307fbd31 | 473 | } |
acbbb76a SF |
474 | len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len, |
475 | nls_cp); | |
14cae324 | 476 | rc = |
307fbd31 SP |
477 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
478 | (char *)domain, 2 * len); | |
1717ffc5 | 479 | kfree(domain); |
14cae324 | 480 | if (rc) { |
f96637be JP |
481 | cifs_dbg(VFS, "%s: Could not update with domain\n", |
482 | __func__); | |
14cae324 SP |
483 | return rc; |
484 | } | |
307fbd31 SP |
485 | } else if (ses->serverName) { |
486 | len = strlen(ses->serverName); | |
487 | ||
488 | server = kmalloc(2 + (len * 2), GFP_KERNEL); | |
489 | if (server == NULL) { | |
307fbd31 | 490 | rc = -ENOMEM; |
14cae324 | 491 | return rc; |
307fbd31 | 492 | } |
acbbb76a | 493 | len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len, |
307fbd31 | 494 | nls_cp); |
14cae324 | 495 | rc = |
307fbd31 SP |
496 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
497 | (char *)server, 2 * len); | |
498 | kfree(server); | |
14cae324 | 499 | if (rc) { |
f96637be JP |
500 | cifs_dbg(VFS, "%s: Could not update with server\n", |
501 | __func__); | |
14cae324 SP |
502 | return rc; |
503 | } | |
1717ffc5 | 504 | } |
307fbd31 SP |
505 | |
506 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
d3686d54 | 507 | ntlmv2_hash); |
14cae324 | 508 | if (rc) |
f96637be | 509 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
307fbd31 | 510 | |
307fbd31 SP |
511 | return rc; |
512 | } | |
513 | ||
514 | static int | |
96daf2b0 | 515 | CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash) |
307fbd31 SP |
516 | { |
517 | int rc; | |
518 | unsigned int offset = CIFS_SESS_KEY_SIZE + 8; | |
519 | ||
520 | if (!ses->server->secmech.sdeschmacmd5) { | |
f96637be | 521 | cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); |
307fbd31 SP |
522 | return -1; |
523 | } | |
524 | ||
14cae324 | 525 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
d3686d54 | 526 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 527 | if (rc) { |
f96637be JP |
528 | cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", |
529 | __func__); | |
14cae324 SP |
530 | return rc; |
531 | } | |
307fbd31 SP |
532 | |
533 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
534 | if (rc) { | |
f96637be | 535 | cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__); |
307fbd31 SP |
536 | return rc; |
537 | } | |
538 | ||
d3ba50b1 SP |
539 | if (ses->server->secType == RawNTLMSSP) |
540 | memcpy(ses->auth_key.response + offset, | |
d3686d54 | 541 | ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); |
d3ba50b1 SP |
542 | else |
543 | memcpy(ses->auth_key.response + offset, | |
544 | ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); | |
14cae324 | 545 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 | 546 | ses->auth_key.response + offset, ses->auth_key.len - offset); |
14cae324 | 547 | if (rc) { |
f96637be | 548 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
14cae324 SP |
549 | return rc; |
550 | } | |
307fbd31 SP |
551 | |
552 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
553 | ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
14cae324 | 554 | if (rc) |
f96637be | 555 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
9fbc5908 SF |
556 | |
557 | return rc; | |
558 | } | |
559 | ||
307fbd31 | 560 | |
2b149f11 | 561 | int |
96daf2b0 | 562 | setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp) |
9fbc5908 | 563 | { |
c8e56f1f | 564 | int rc; |
21e73393 | 565 | int baselen; |
d3686d54 | 566 | unsigned int tilen; |
21e73393 | 567 | struct ntlmv2_resp *buf; |
d3686d54 SP |
568 | char ntlmv2_hash[16]; |
569 | unsigned char *tiblob = NULL; /* target info blob */ | |
6d027cfd | 570 | |
2b149f11 SP |
571 | if (ses->server->secType == RawNTLMSSP) { |
572 | if (!ses->domainName) { | |
f7c5445a | 573 | rc = find_domain_name(ses, nls_cp); |
2b149f11 | 574 | if (rc) { |
f96637be JP |
575 | cifs_dbg(VFS, "error %d finding domain name\n", |
576 | rc); | |
2b149f11 SP |
577 | goto setup_ntlmv2_rsp_ret; |
578 | } | |
579 | } | |
580 | } else { | |
9daa42e2 | 581 | rc = build_avpair_blob(ses, nls_cp); |
2b149f11 | 582 | if (rc) { |
f96637be | 583 | cifs_dbg(VFS, "error %d building av pair blob\n", rc); |
d3686d54 | 584 | goto setup_ntlmv2_rsp_ret; |
2b149f11 SP |
585 | } |
586 | } | |
a8ee0344 | 587 | |
21e73393 | 588 | baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp); |
d3686d54 SP |
589 | tilen = ses->auth_key.len; |
590 | tiblob = ses->auth_key.response; | |
591 | ||
592 | ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL); | |
21e73393 SP |
593 | if (!ses->auth_key.response) { |
594 | rc = ENOMEM; | |
d3686d54 | 595 | ses->auth_key.len = 0; |
21e73393 SP |
596 | goto setup_ntlmv2_rsp_ret; |
597 | } | |
d3686d54 | 598 | ses->auth_key.len += baselen; |
21e73393 SP |
599 | |
600 | buf = (struct ntlmv2_resp *) | |
601 | (ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
602 | buf->blob_signature = cpu_to_le32(0x00000101); | |
603 | buf->reserved = 0; | |
604 | buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME)); | |
605 | get_random_bytes(&buf->client_chal, sizeof(buf->client_chal)); | |
606 | buf->reserved2 = 0; | |
607 | ||
d3686d54 | 608 | memcpy(ses->auth_key.response + baselen, tiblob, tilen); |
21e73393 | 609 | |
f7c5445a | 610 | /* calculate ntlmv2_hash */ |
d3686d54 | 611 | rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp); |
2b149f11 | 612 | if (rc) { |
f96637be | 613 | cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc); |
2b149f11 SP |
614 | goto setup_ntlmv2_rsp_ret; |
615 | } | |
f7c5445a SP |
616 | |
617 | /* calculate first part of the client response (CR1) */ | |
d3686d54 | 618 | rc = CalcNTLMv2_response(ses, ntlmv2_hash); |
307fbd31 | 619 | if (rc) { |
f96637be | 620 | cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc); |
307fbd31 SP |
621 | goto setup_ntlmv2_rsp_ret; |
622 | } | |
b609f06a | 623 | |
5d0d2882 | 624 | /* now calculate the session key for NTLMv2 */ |
14cae324 | 625 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
d3686d54 | 626 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 627 | if (rc) { |
f96637be JP |
628 | cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", |
629 | __func__); | |
14cae324 SP |
630 | goto setup_ntlmv2_rsp_ret; |
631 | } | |
307fbd31 SP |
632 | |
633 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
634 | if (rc) { | |
f96637be | 635 | cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__); |
307fbd31 SP |
636 | goto setup_ntlmv2_rsp_ret; |
637 | } | |
638 | ||
14cae324 | 639 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 SP |
640 | ses->auth_key.response + CIFS_SESS_KEY_SIZE, |
641 | CIFS_HMAC_MD5_HASH_SIZE); | |
14cae324 | 642 | if (rc) { |
f96637be | 643 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
14cae324 SP |
644 | goto setup_ntlmv2_rsp_ret; |
645 | } | |
307fbd31 SP |
646 | |
647 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
648 | ses->auth_key.response); | |
14cae324 | 649 | if (rc) |
f96637be | 650 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
2b149f11 | 651 | |
2b149f11 | 652 | setup_ntlmv2_rsp_ret: |
d3686d54 | 653 | kfree(tiblob); |
2b149f11 SP |
654 | |
655 | return rc; | |
6d027cfd SF |
656 | } |
657 | ||
d2b91521 | 658 | int |
96daf2b0 | 659 | calc_seckey(struct cifs_ses *ses) |
d2b91521 SP |
660 | { |
661 | int rc; | |
662 | struct crypto_blkcipher *tfm_arc4; | |
663 | struct scatterlist sgin, sgout; | |
664 | struct blkcipher_desc desc; | |
665 | unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */ | |
666 | ||
667 | get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE); | |
668 | ||
669 | tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC); | |
7a8587e7 SP |
670 | if (IS_ERR(tfm_arc4)) { |
671 | rc = PTR_ERR(tfm_arc4); | |
f96637be | 672 | cifs_dbg(VFS, "could not allocate crypto API arc4\n"); |
7a8587e7 | 673 | return rc; |
d2b91521 SP |
674 | } |
675 | ||
676 | desc.tfm = tfm_arc4; | |
677 | ||
14cae324 | 678 | rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response, |
d2b91521 | 679 | CIFS_SESS_KEY_SIZE); |
14cae324 | 680 | if (rc) { |
f96637be JP |
681 | cifs_dbg(VFS, "%s: Could not set response as a key\n", |
682 | __func__); | |
14cae324 SP |
683 | return rc; |
684 | } | |
d2b91521 SP |
685 | |
686 | sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE); | |
d3686d54 | 687 | sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); |
d2b91521 SP |
688 | |
689 | rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE); | |
690 | if (rc) { | |
f96637be | 691 | cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc); |
d2b91521 SP |
692 | crypto_free_blkcipher(tfm_arc4); |
693 | return rc; | |
694 | } | |
695 | ||
696 | /* make secondary_key/nonce as session key */ | |
697 | memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE); | |
698 | /* and make len as that of session key only */ | |
699 | ses->auth_key.len = CIFS_SESS_KEY_SIZE; | |
700 | ||
701 | crypto_free_blkcipher(tfm_arc4); | |
702 | ||
14cae324 | 703 | return rc; |
d2b91521 SP |
704 | } |
705 | ||
706 | void | |
707 | cifs_crypto_shash_release(struct TCP_Server_Info *server) | |
708 | { | |
3c1bf7e4 PS |
709 | if (server->secmech.hmacsha256) |
710 | crypto_free_shash(server->secmech.hmacsha256); | |
711 | ||
d2b91521 SP |
712 | if (server->secmech.md5) |
713 | crypto_free_shash(server->secmech.md5); | |
714 | ||
715 | if (server->secmech.hmacmd5) | |
716 | crypto_free_shash(server->secmech.hmacmd5); | |
717 | ||
3c1bf7e4 PS |
718 | kfree(server->secmech.sdeschmacsha256); |
719 | ||
d2b91521 SP |
720 | kfree(server->secmech.sdeschmacmd5); |
721 | ||
722 | kfree(server->secmech.sdescmd5); | |
723 | } | |
724 | ||
725 | int | |
726 | cifs_crypto_shash_allocate(struct TCP_Server_Info *server) | |
727 | { | |
728 | int rc; | |
729 | unsigned int size; | |
730 | ||
731 | server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0); | |
ee2c9258 | 732 | if (IS_ERR(server->secmech.hmacmd5)) { |
f96637be | 733 | cifs_dbg(VFS, "could not allocate crypto hmacmd5\n"); |
d2b91521 SP |
734 | return PTR_ERR(server->secmech.hmacmd5); |
735 | } | |
736 | ||
737 | server->secmech.md5 = crypto_alloc_shash("md5", 0, 0); | |
ee2c9258 | 738 | if (IS_ERR(server->secmech.md5)) { |
f96637be | 739 | cifs_dbg(VFS, "could not allocate crypto md5\n"); |
d2b91521 SP |
740 | rc = PTR_ERR(server->secmech.md5); |
741 | goto crypto_allocate_md5_fail; | |
742 | } | |
743 | ||
3c1bf7e4 PS |
744 | server->secmech.hmacsha256 = crypto_alloc_shash("hmac(sha256)", 0, 0); |
745 | if (IS_ERR(server->secmech.hmacsha256)) { | |
f96637be | 746 | cifs_dbg(VFS, "could not allocate crypto hmacsha256\n"); |
3c1bf7e4 PS |
747 | rc = PTR_ERR(server->secmech.hmacsha256); |
748 | goto crypto_allocate_hmacsha256_fail; | |
749 | } | |
750 | ||
d2b91521 SP |
751 | size = sizeof(struct shash_desc) + |
752 | crypto_shash_descsize(server->secmech.hmacmd5); | |
753 | server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL); | |
754 | if (!server->secmech.sdeschmacmd5) { | |
d2b91521 SP |
755 | rc = -ENOMEM; |
756 | goto crypto_allocate_hmacmd5_sdesc_fail; | |
757 | } | |
758 | server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5; | |
759 | server->secmech.sdeschmacmd5->shash.flags = 0x0; | |
760 | ||
d2b91521 SP |
761 | size = sizeof(struct shash_desc) + |
762 | crypto_shash_descsize(server->secmech.md5); | |
763 | server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL); | |
764 | if (!server->secmech.sdescmd5) { | |
d2b91521 SP |
765 | rc = -ENOMEM; |
766 | goto crypto_allocate_md5_sdesc_fail; | |
767 | } | |
768 | server->secmech.sdescmd5->shash.tfm = server->secmech.md5; | |
769 | server->secmech.sdescmd5->shash.flags = 0x0; | |
770 | ||
3c1bf7e4 PS |
771 | size = sizeof(struct shash_desc) + |
772 | crypto_shash_descsize(server->secmech.hmacsha256); | |
773 | server->secmech.sdeschmacsha256 = kmalloc(size, GFP_KERNEL); | |
774 | if (!server->secmech.sdeschmacsha256) { | |
3c1bf7e4 PS |
775 | rc = -ENOMEM; |
776 | goto crypto_allocate_hmacsha256_sdesc_fail; | |
777 | } | |
778 | server->secmech.sdeschmacsha256->shash.tfm = server->secmech.hmacsha256; | |
779 | server->secmech.sdeschmacsha256->shash.flags = 0x0; | |
780 | ||
d2b91521 SP |
781 | return 0; |
782 | ||
3c1bf7e4 PS |
783 | crypto_allocate_hmacsha256_sdesc_fail: |
784 | kfree(server->secmech.sdescmd5); | |
785 | ||
d2b91521 SP |
786 | crypto_allocate_md5_sdesc_fail: |
787 | kfree(server->secmech.sdeschmacmd5); | |
788 | ||
789 | crypto_allocate_hmacmd5_sdesc_fail: | |
3c1bf7e4 PS |
790 | crypto_free_shash(server->secmech.hmacsha256); |
791 | ||
792 | crypto_allocate_hmacsha256_fail: | |
d2b91521 SP |
793 | crypto_free_shash(server->secmech.md5); |
794 | ||
795 | crypto_allocate_md5_fail: | |
796 | crypto_free_shash(server->secmech.hmacmd5); | |
797 | ||
798 | return rc; | |
799 | } |