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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 | memcpy(lnm_session_key, password_with_pad, |
280 | CIFS_ENCPWD_SIZE); | |
43988d76 | 281 | return 0; |
4e53a3fb | 282 | } |
bdc4bf6e | 283 | |
7c7b25bc SF |
284 | /* calculate old style session key */ |
285 | /* calling toupper is less broken than repeatedly | |
286 | calling nls_toupper would be since that will never | |
287 | work for UTF8, but neither handles multibyte code pages | |
288 | but the only alternative would be converting to UCS-16 (Unicode) | |
289 | (using a routine something like UniStrupr) then | |
290 | uppercasing and then converting back from Unicode - which | |
291 | would only worth doing it if we knew it were utf8. Basically | |
292 | utf8 and other multibyte codepages each need their own strupper | |
293 | function since a byte at a time will ont work. */ | |
294 | ||
ef571cad | 295 | for (i = 0; i < CIFS_ENCPWD_SIZE; i++) |
7c7b25bc | 296 | password_with_pad[i] = toupper(password_with_pad[i]); |
7c7b25bc | 297 | |
43988d76 | 298 | rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key); |
4e53a3fb | 299 | |
43988d76 | 300 | return rc; |
7c7b25bc SF |
301 | } |
302 | #endif /* CIFS_WEAK_PW_HASH */ | |
303 | ||
9daa42e2 SP |
304 | /* Build a proper attribute value/target info pairs blob. |
305 | * Fill in netbios and dns domain name and workstation name | |
306 | * and client time (total five av pairs and + one end of fields indicator. | |
307 | * Allocate domain name which gets freed when session struct is deallocated. | |
2b149f11 SP |
308 | */ |
309 | static int | |
96daf2b0 | 310 | build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 | 311 | { |
9daa42e2 | 312 | unsigned int dlen; |
cfbd6f84 | 313 | unsigned int size = 2 * sizeof(struct ntlmssp2_name); |
9daa42e2 SP |
314 | char *defdmname = "WORKGROUP"; |
315 | unsigned char *blobptr; | |
2b149f11 SP |
316 | struct ntlmssp2_name *attrptr; |
317 | ||
9daa42e2 SP |
318 | if (!ses->domainName) { |
319 | ses->domainName = kstrdup(defdmname, GFP_KERNEL); | |
320 | if (!ses->domainName) | |
321 | return -ENOMEM; | |
322 | } | |
323 | ||
324 | dlen = strlen(ses->domainName); | |
9daa42e2 | 325 | |
cfbd6f84 SP |
326 | /* |
327 | * The length of this blob is two times the size of a | |
328 | * structure (av pair) which holds name/size | |
329 | * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) + | |
330 | * unicode length of a netbios domain name | |
9daa42e2 | 331 | */ |
cfbd6f84 | 332 | ses->auth_key.len = size + 2 * dlen; |
d3686d54 SP |
333 | ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL); |
334 | if (!ses->auth_key.response) { | |
335 | ses->auth_key.len = 0; | |
2b149f11 SP |
336 | return -ENOMEM; |
337 | } | |
9daa42e2 | 338 | |
d3686d54 | 339 | blobptr = ses->auth_key.response; |
9daa42e2 SP |
340 | attrptr = (struct ntlmssp2_name *) blobptr; |
341 | ||
cfbd6f84 SP |
342 | /* |
343 | * As defined in MS-NTLM 3.3.2, just this av pair field | |
344 | * is sufficient as part of the temp | |
345 | */ | |
9daa42e2 SP |
346 | attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME); |
347 | attrptr->length = cpu_to_le16(2 * dlen); | |
348 | blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); | |
acbbb76a | 349 | cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp); |
9daa42e2 | 350 | |
2b149f11 SP |
351 | return 0; |
352 | } | |
353 | ||
354 | /* Server has provided av pairs/target info in the type 2 challenge | |
355 | * packet and we have plucked it and stored within smb session. | |
356 | * We parse that blob here to find netbios domain name to be used | |
357 | * as part of ntlmv2 authentication (in Target String), if not already | |
358 | * specified on the command line. | |
359 | * If this function returns without any error but without fetching | |
360 | * domain name, authentication may fail against some server but | |
361 | * may not fail against other (those who are not very particular | |
362 | * about target string i.e. for some, just user name might suffice. | |
363 | */ | |
364 | static int | |
96daf2b0 | 365 | find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp) |
2b149f11 SP |
366 | { |
367 | unsigned int attrsize; | |
368 | unsigned int type; | |
369 | unsigned int onesize = sizeof(struct ntlmssp2_name); | |
370 | unsigned char *blobptr; | |
371 | unsigned char *blobend; | |
372 | struct ntlmssp2_name *attrptr; | |
373 | ||
d3686d54 | 374 | if (!ses->auth_key.len || !ses->auth_key.response) |
2b149f11 SP |
375 | return 0; |
376 | ||
d3686d54 SP |
377 | blobptr = ses->auth_key.response; |
378 | blobend = blobptr + ses->auth_key.len; | |
2b149f11 SP |
379 | |
380 | while (blobptr + onesize < blobend) { | |
381 | attrptr = (struct ntlmssp2_name *) blobptr; | |
382 | type = le16_to_cpu(attrptr->type); | |
383 | if (type == NTLMSSP_AV_EOL) | |
384 | break; | |
385 | blobptr += 2; /* advance attr type */ | |
386 | attrsize = le16_to_cpu(attrptr->length); | |
387 | blobptr += 2; /* advance attr size */ | |
388 | if (blobptr + attrsize > blobend) | |
389 | break; | |
390 | if (type == NTLMSSP_AV_NB_DOMAIN_NAME) { | |
391 | if (!attrsize) | |
392 | break; | |
393 | if (!ses->domainName) { | |
394 | ses->domainName = | |
395 | kmalloc(attrsize + 1, GFP_KERNEL); | |
396 | if (!ses->domainName) | |
397 | return -ENOMEM; | |
acbbb76a | 398 | cifs_from_utf16(ses->domainName, |
2b149f11 | 399 | (__le16 *)blobptr, attrsize, attrsize, |
f7c5445a | 400 | nls_cp, false); |
2b149f11 SP |
401 | break; |
402 | } | |
403 | } | |
404 | blobptr += attrsize; /* advance attr value */ | |
405 | } | |
406 | ||
407 | return 0; | |
408 | } | |
409 | ||
96daf2b0 | 410 | static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash, |
50c2f753 | 411 | const struct nls_table *nls_cp) |
a8ee0344 SF |
412 | { |
413 | int rc = 0; | |
414 | int len; | |
307fbd31 | 415 | char nt_hash[CIFS_NTHASH_SIZE]; |
50c2f753 SF |
416 | wchar_t *user; |
417 | wchar_t *domain; | |
307fbd31 | 418 | wchar_t *server; |
a8ee0344 | 419 | |
307fbd31 | 420 | if (!ses->server->secmech.sdeschmacmd5) { |
f96637be | 421 | cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); |
307fbd31 SP |
422 | return -1; |
423 | } | |
56234e27 | 424 | |
c8e56f1f | 425 | /* calculate md4 hash of password */ |
9ef5992e | 426 | E_md4hash(ses->password, nt_hash, nls_cp); |
9fbc5908 | 427 | |
14cae324 | 428 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash, |
307fbd31 | 429 | CIFS_NTHASH_SIZE); |
14cae324 | 430 | if (rc) { |
f96637be | 431 | cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__); |
14cae324 SP |
432 | return rc; |
433 | } | |
307fbd31 SP |
434 | |
435 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
436 | if (rc) { | |
f96637be | 437 | cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__); |
307fbd31 SP |
438 | return rc; |
439 | } | |
a8ee0344 | 440 | |
8727c8a8 | 441 | /* convert ses->user_name to unicode and uppercase */ |
04febabc | 442 | len = ses->user_name ? strlen(ses->user_name) : 0; |
1717ffc5 | 443 | user = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 444 | if (user == NULL) { |
307fbd31 | 445 | rc = -ENOMEM; |
14cae324 | 446 | return rc; |
307fbd31 | 447 | } |
04febabc JL |
448 | |
449 | if (len) { | |
acbbb76a | 450 | len = cifs_strtoUTF16((__le16 *)user, ses->user_name, len, nls_cp); |
04febabc JL |
451 | UniStrupr(user); |
452 | } else { | |
453 | memset(user, '\0', 2); | |
454 | } | |
307fbd31 | 455 | |
14cae324 | 456 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 | 457 | (char *)user, 2 * len); |
14cae324 SP |
458 | kfree(user); |
459 | if (rc) { | |
f96637be | 460 | cifs_dbg(VFS, "%s: Could not update with user\n", __func__); |
14cae324 SP |
461 | return rc; |
462 | } | |
a8ee0344 SF |
463 | |
464 | /* convert ses->domainName to unicode and uppercase */ | |
50c2f753 | 465 | if (ses->domainName) { |
1717ffc5 | 466 | len = strlen(ses->domainName); |
a8ee0344 | 467 | |
50c2f753 | 468 | domain = kmalloc(2 + (len * 2), GFP_KERNEL); |
307fbd31 | 469 | if (domain == NULL) { |
307fbd31 | 470 | rc = -ENOMEM; |
14cae324 | 471 | return rc; |
307fbd31 | 472 | } |
acbbb76a SF |
473 | len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len, |
474 | nls_cp); | |
14cae324 | 475 | rc = |
307fbd31 SP |
476 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
477 | (char *)domain, 2 * len); | |
1717ffc5 | 478 | kfree(domain); |
14cae324 | 479 | if (rc) { |
f96637be JP |
480 | cifs_dbg(VFS, "%s: Could not update with domain\n", |
481 | __func__); | |
14cae324 SP |
482 | return rc; |
483 | } | |
307fbd31 SP |
484 | } else if (ses->serverName) { |
485 | len = strlen(ses->serverName); | |
486 | ||
487 | server = kmalloc(2 + (len * 2), GFP_KERNEL); | |
488 | if (server == NULL) { | |
307fbd31 | 489 | rc = -ENOMEM; |
14cae324 | 490 | return rc; |
307fbd31 | 491 | } |
acbbb76a | 492 | len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len, |
307fbd31 | 493 | nls_cp); |
14cae324 | 494 | rc = |
307fbd31 SP |
495 | crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
496 | (char *)server, 2 * len); | |
497 | kfree(server); | |
14cae324 | 498 | if (rc) { |
f96637be JP |
499 | cifs_dbg(VFS, "%s: Could not update with server\n", |
500 | __func__); | |
14cae324 SP |
501 | return rc; |
502 | } | |
1717ffc5 | 503 | } |
307fbd31 SP |
504 | |
505 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
d3686d54 | 506 | ntlmv2_hash); |
14cae324 | 507 | if (rc) |
f96637be | 508 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
307fbd31 | 509 | |
307fbd31 SP |
510 | return rc; |
511 | } | |
512 | ||
513 | static int | |
96daf2b0 | 514 | CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash) |
307fbd31 SP |
515 | { |
516 | int rc; | |
517 | unsigned int offset = CIFS_SESS_KEY_SIZE + 8; | |
518 | ||
519 | if (!ses->server->secmech.sdeschmacmd5) { | |
f96637be | 520 | cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); |
307fbd31 SP |
521 | return -1; |
522 | } | |
523 | ||
14cae324 | 524 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
d3686d54 | 525 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 526 | if (rc) { |
f96637be JP |
527 | cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", |
528 | __func__); | |
14cae324 SP |
529 | return rc; |
530 | } | |
307fbd31 SP |
531 | |
532 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
533 | if (rc) { | |
f96637be | 534 | cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__); |
307fbd31 SP |
535 | return rc; |
536 | } | |
537 | ||
d3ba50b1 SP |
538 | if (ses->server->secType == RawNTLMSSP) |
539 | memcpy(ses->auth_key.response + offset, | |
d3686d54 | 540 | ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); |
d3ba50b1 SP |
541 | else |
542 | memcpy(ses->auth_key.response + offset, | |
543 | ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); | |
14cae324 | 544 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 | 545 | ses->auth_key.response + offset, ses->auth_key.len - offset); |
14cae324 | 546 | if (rc) { |
f96637be | 547 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
14cae324 SP |
548 | return rc; |
549 | } | |
307fbd31 SP |
550 | |
551 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
552 | ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
14cae324 | 553 | if (rc) |
f96637be | 554 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
9fbc5908 SF |
555 | |
556 | return rc; | |
557 | } | |
558 | ||
307fbd31 | 559 | |
2b149f11 | 560 | int |
96daf2b0 | 561 | setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp) |
9fbc5908 | 562 | { |
c8e56f1f | 563 | int rc; |
21e73393 | 564 | int baselen; |
d3686d54 | 565 | unsigned int tilen; |
21e73393 | 566 | struct ntlmv2_resp *buf; |
d3686d54 SP |
567 | char ntlmv2_hash[16]; |
568 | unsigned char *tiblob = NULL; /* target info blob */ | |
6d027cfd | 569 | |
2b149f11 SP |
570 | if (ses->server->secType == RawNTLMSSP) { |
571 | if (!ses->domainName) { | |
f7c5445a | 572 | rc = find_domain_name(ses, nls_cp); |
2b149f11 | 573 | if (rc) { |
f96637be JP |
574 | cifs_dbg(VFS, "error %d finding domain name\n", |
575 | rc); | |
2b149f11 SP |
576 | goto setup_ntlmv2_rsp_ret; |
577 | } | |
578 | } | |
579 | } else { | |
9daa42e2 | 580 | rc = build_avpair_blob(ses, nls_cp); |
2b149f11 | 581 | if (rc) { |
f96637be | 582 | cifs_dbg(VFS, "error %d building av pair blob\n", rc); |
d3686d54 | 583 | goto setup_ntlmv2_rsp_ret; |
2b149f11 SP |
584 | } |
585 | } | |
a8ee0344 | 586 | |
21e73393 | 587 | baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp); |
d3686d54 SP |
588 | tilen = ses->auth_key.len; |
589 | tiblob = ses->auth_key.response; | |
590 | ||
591 | ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL); | |
21e73393 SP |
592 | if (!ses->auth_key.response) { |
593 | rc = ENOMEM; | |
d3686d54 | 594 | ses->auth_key.len = 0; |
21e73393 SP |
595 | goto setup_ntlmv2_rsp_ret; |
596 | } | |
d3686d54 | 597 | ses->auth_key.len += baselen; |
21e73393 SP |
598 | |
599 | buf = (struct ntlmv2_resp *) | |
600 | (ses->auth_key.response + CIFS_SESS_KEY_SIZE); | |
601 | buf->blob_signature = cpu_to_le32(0x00000101); | |
602 | buf->reserved = 0; | |
603 | buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME)); | |
604 | get_random_bytes(&buf->client_chal, sizeof(buf->client_chal)); | |
605 | buf->reserved2 = 0; | |
606 | ||
d3686d54 | 607 | memcpy(ses->auth_key.response + baselen, tiblob, tilen); |
21e73393 | 608 | |
f7c5445a | 609 | /* calculate ntlmv2_hash */ |
d3686d54 | 610 | rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp); |
2b149f11 | 611 | if (rc) { |
f96637be | 612 | cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc); |
2b149f11 SP |
613 | goto setup_ntlmv2_rsp_ret; |
614 | } | |
f7c5445a SP |
615 | |
616 | /* calculate first part of the client response (CR1) */ | |
d3686d54 | 617 | rc = CalcNTLMv2_response(ses, ntlmv2_hash); |
307fbd31 | 618 | if (rc) { |
f96637be | 619 | cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc); |
307fbd31 SP |
620 | goto setup_ntlmv2_rsp_ret; |
621 | } | |
b609f06a | 622 | |
5d0d2882 | 623 | /* now calculate the session key for NTLMv2 */ |
14cae324 | 624 | rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, |
d3686d54 | 625 | ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); |
14cae324 | 626 | if (rc) { |
f96637be JP |
627 | cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", |
628 | __func__); | |
14cae324 SP |
629 | goto setup_ntlmv2_rsp_ret; |
630 | } | |
307fbd31 SP |
631 | |
632 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash); | |
633 | if (rc) { | |
f96637be | 634 | cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__); |
307fbd31 SP |
635 | goto setup_ntlmv2_rsp_ret; |
636 | } | |
637 | ||
14cae324 | 638 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash, |
307fbd31 SP |
639 | ses->auth_key.response + CIFS_SESS_KEY_SIZE, |
640 | CIFS_HMAC_MD5_HASH_SIZE); | |
14cae324 | 641 | if (rc) { |
f96637be | 642 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
14cae324 SP |
643 | goto setup_ntlmv2_rsp_ret; |
644 | } | |
307fbd31 SP |
645 | |
646 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash, | |
647 | ses->auth_key.response); | |
14cae324 | 648 | if (rc) |
f96637be | 649 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
2b149f11 | 650 | |
2b149f11 | 651 | setup_ntlmv2_rsp_ret: |
d3686d54 | 652 | kfree(tiblob); |
2b149f11 SP |
653 | |
654 | return rc; | |
6d027cfd SF |
655 | } |
656 | ||
d2b91521 | 657 | int |
96daf2b0 | 658 | calc_seckey(struct cifs_ses *ses) |
d2b91521 SP |
659 | { |
660 | int rc; | |
661 | struct crypto_blkcipher *tfm_arc4; | |
662 | struct scatterlist sgin, sgout; | |
663 | struct blkcipher_desc desc; | |
664 | unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */ | |
665 | ||
666 | get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE); | |
667 | ||
668 | tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC); | |
7a8587e7 SP |
669 | if (IS_ERR(tfm_arc4)) { |
670 | rc = PTR_ERR(tfm_arc4); | |
f96637be | 671 | cifs_dbg(VFS, "could not allocate crypto API arc4\n"); |
7a8587e7 | 672 | return rc; |
d2b91521 SP |
673 | } |
674 | ||
675 | desc.tfm = tfm_arc4; | |
676 | ||
14cae324 | 677 | rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response, |
d2b91521 | 678 | CIFS_SESS_KEY_SIZE); |
14cae324 | 679 | if (rc) { |
f96637be JP |
680 | cifs_dbg(VFS, "%s: Could not set response as a key\n", |
681 | __func__); | |
14cae324 SP |
682 | return rc; |
683 | } | |
d2b91521 SP |
684 | |
685 | sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE); | |
d3686d54 | 686 | sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); |
d2b91521 SP |
687 | |
688 | rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE); | |
689 | if (rc) { | |
f96637be | 690 | cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc); |
d2b91521 SP |
691 | crypto_free_blkcipher(tfm_arc4); |
692 | return rc; | |
693 | } | |
694 | ||
695 | /* make secondary_key/nonce as session key */ | |
696 | memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE); | |
697 | /* and make len as that of session key only */ | |
698 | ses->auth_key.len = CIFS_SESS_KEY_SIZE; | |
699 | ||
700 | crypto_free_blkcipher(tfm_arc4); | |
701 | ||
14cae324 | 702 | return rc; |
d2b91521 SP |
703 | } |
704 | ||
705 | void | |
706 | cifs_crypto_shash_release(struct TCP_Server_Info *server) | |
707 | { | |
3c1bf7e4 PS |
708 | if (server->secmech.hmacsha256) |
709 | crypto_free_shash(server->secmech.hmacsha256); | |
710 | ||
d2b91521 SP |
711 | if (server->secmech.md5) |
712 | crypto_free_shash(server->secmech.md5); | |
713 | ||
714 | if (server->secmech.hmacmd5) | |
715 | crypto_free_shash(server->secmech.hmacmd5); | |
716 | ||
3c1bf7e4 PS |
717 | kfree(server->secmech.sdeschmacsha256); |
718 | ||
d2b91521 SP |
719 | kfree(server->secmech.sdeschmacmd5); |
720 | ||
721 | kfree(server->secmech.sdescmd5); | |
722 | } | |
723 | ||
724 | int | |
725 | cifs_crypto_shash_allocate(struct TCP_Server_Info *server) | |
726 | { | |
727 | int rc; | |
728 | unsigned int size; | |
729 | ||
730 | server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0); | |
ee2c9258 | 731 | if (IS_ERR(server->secmech.hmacmd5)) { |
f96637be | 732 | cifs_dbg(VFS, "could not allocate crypto hmacmd5\n"); |
d2b91521 SP |
733 | return PTR_ERR(server->secmech.hmacmd5); |
734 | } | |
735 | ||
736 | server->secmech.md5 = crypto_alloc_shash("md5", 0, 0); | |
ee2c9258 | 737 | if (IS_ERR(server->secmech.md5)) { |
f96637be | 738 | cifs_dbg(VFS, "could not allocate crypto md5\n"); |
d2b91521 SP |
739 | rc = PTR_ERR(server->secmech.md5); |
740 | goto crypto_allocate_md5_fail; | |
741 | } | |
742 | ||
3c1bf7e4 PS |
743 | server->secmech.hmacsha256 = crypto_alloc_shash("hmac(sha256)", 0, 0); |
744 | if (IS_ERR(server->secmech.hmacsha256)) { | |
f96637be | 745 | cifs_dbg(VFS, "could not allocate crypto hmacsha256\n"); |
3c1bf7e4 PS |
746 | rc = PTR_ERR(server->secmech.hmacsha256); |
747 | goto crypto_allocate_hmacsha256_fail; | |
748 | } | |
749 | ||
d2b91521 SP |
750 | size = sizeof(struct shash_desc) + |
751 | crypto_shash_descsize(server->secmech.hmacmd5); | |
752 | server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL); | |
753 | if (!server->secmech.sdeschmacmd5) { | |
d2b91521 SP |
754 | rc = -ENOMEM; |
755 | goto crypto_allocate_hmacmd5_sdesc_fail; | |
756 | } | |
757 | server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5; | |
758 | server->secmech.sdeschmacmd5->shash.flags = 0x0; | |
759 | ||
d2b91521 SP |
760 | size = sizeof(struct shash_desc) + |
761 | crypto_shash_descsize(server->secmech.md5); | |
762 | server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL); | |
763 | if (!server->secmech.sdescmd5) { | |
d2b91521 SP |
764 | rc = -ENOMEM; |
765 | goto crypto_allocate_md5_sdesc_fail; | |
766 | } | |
767 | server->secmech.sdescmd5->shash.tfm = server->secmech.md5; | |
768 | server->secmech.sdescmd5->shash.flags = 0x0; | |
769 | ||
3c1bf7e4 PS |
770 | size = sizeof(struct shash_desc) + |
771 | crypto_shash_descsize(server->secmech.hmacsha256); | |
772 | server->secmech.sdeschmacsha256 = kmalloc(size, GFP_KERNEL); | |
773 | if (!server->secmech.sdeschmacsha256) { | |
3c1bf7e4 PS |
774 | rc = -ENOMEM; |
775 | goto crypto_allocate_hmacsha256_sdesc_fail; | |
776 | } | |
777 | server->secmech.sdeschmacsha256->shash.tfm = server->secmech.hmacsha256; | |
778 | server->secmech.sdeschmacsha256->shash.flags = 0x0; | |
779 | ||
d2b91521 SP |
780 | return 0; |
781 | ||
3c1bf7e4 PS |
782 | crypto_allocate_hmacsha256_sdesc_fail: |
783 | kfree(server->secmech.sdescmd5); | |
784 | ||
d2b91521 SP |
785 | crypto_allocate_md5_sdesc_fail: |
786 | kfree(server->secmech.sdeschmacmd5); | |
787 | ||
788 | crypto_allocate_hmacmd5_sdesc_fail: | |
3c1bf7e4 PS |
789 | crypto_free_shash(server->secmech.hmacsha256); |
790 | ||
791 | crypto_allocate_hmacsha256_fail: | |
d2b91521 SP |
792 | crypto_free_shash(server->secmech.md5); |
793 | ||
794 | crypto_allocate_md5_fail: | |
795 | crypto_free_shash(server->secmech.hmacmd5); | |
796 | ||
797 | return rc; | |
798 | } |