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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/cifs/cifsencrypt.c
3 *
Steve French12b3b8f2006-02-09 21:12:47 +00004 * Copyright (C) International Business Machines Corp., 2005,2006
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 * 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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include "cifspdu.h"
Steve Frenchffdd6e42007-06-24 21:15:44 +000025#include "cifsglob.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include "cifs_debug.h"
27#include "md5.h"
28#include "cifs_unicode.h"
29#include "cifsproto.h"
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -050030#include "ntlmssp.h"
Steve French7c7b25b2006-06-01 19:20:10 +000031#include <linux/ctype.h>
Steve French6d027cf2006-06-05 16:26:05 +000032#include <linux/random.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Steve Frenchffdd6e42007-06-24 21:15:44 +000034/* Calculate and return the CIFS signature based on the mac key and SMB PDU */
Linus Torvalds1da177e2005-04-16 15:20:36 -070035/* the 16 byte signature must be allocated by the caller */
36/* Note we only use the 1st eight bytes */
Steve Frenchffdd6e42007-06-24 21:15:44 +000037/* Note that the smb header signature field on input contains the
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 sequence number before this function is called */
39
40extern void mdfour(unsigned char *out, unsigned char *in, int n);
41extern void E_md4hash(const unsigned char *passwd, unsigned char *p16);
Jeff Layton4e53a3f2008-12-05 20:41:21 -050042extern void SMBencrypt(unsigned char *passwd, const unsigned char *c8,
Steve Frenchffdd6e42007-06-24 21:15:44 +000043 unsigned char *p24);
Steve French50c2f752007-07-13 00:33:32 +000044
Steve Frenchffdd6e42007-06-24 21:15:44 +000045static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
Shirish Pargaonkar21e73392010-10-21 06:42:55 -050046 struct TCP_Server_Info *server, char *signature)
Linus Torvalds1da177e2005-04-16 15:20:36 -070047{
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -050048 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Shirish Pargaonkar21e73392010-10-21 06:42:55 -050050 if (cifs_pdu == NULL || signature == NULL || server == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 return -EINVAL;
52
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -050053 if (!server->secmech.sdescmd5) {
54 cERROR(1, "%s: Can't generate signature\n", __func__);
55 return -1;
56 }
Steve Frenchb609f062007-07-09 07:55:14 +000057
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -050058 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
59 if (rc) {
60 cERROR(1, "%s: Oould not init md5\n", __func__);
61 return rc;
62 }
63
64 crypto_shash_update(&server->secmech.sdescmd5->shash,
65 server->session_key.response, server->session_key.len);
66
67 crypto_shash_update(&server->secmech.sdescmd5->shash,
68 cifs_pdu->Protocol, cifs_pdu->smb_buf_length);
69
70 rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
71
Steve French56234e22010-09-08 20:57:05 +000072 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073}
74
Steve Frenchffdd6e42007-06-24 21:15:44 +000075int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
76 __u32 *pexpected_response_sequence_number)
Linus Torvalds1da177e2005-04-16 15:20:36 -070077{
78 int rc = 0;
79 char smb_signature[20];
80
Steve Frenchffdd6e42007-06-24 21:15:44 +000081 if ((cifs_pdu == NULL) || (server == NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 return -EINVAL;
83
Steve Frenchffdd6e42007-06-24 21:15:44 +000084 if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 return rc;
86
87 spin_lock(&GlobalMid_Lock);
Steve French50c2f752007-07-13 00:33:32 +000088 cifs_pdu->Signature.Sequence.SequenceNumber =
89 cpu_to_le32(server->sequence_number);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 cifs_pdu->Signature.Sequence.Reserved = 0;
Steve French50c2f752007-07-13 00:33:32 +000091
Steve Frenchad009ac2005-04-28 22:41:05 -070092 *pexpected_response_sequence_number = server->sequence_number++;
93 server->sequence_number++;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 spin_unlock(&GlobalMid_Lock);
95
Shirish Pargaonkar21e73392010-10-21 06:42:55 -050096 rc = cifs_calculate_signature(cifs_pdu, server, smb_signature);
Steve Frenchffdd6e42007-06-24 21:15:44 +000097 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
99 else
100 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
101
102 return rc;
103}
104
Steve Frenchffdd6e42007-06-24 21:15:44 +0000105static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500106 struct TCP_Server_Info *server, char *signature)
Steve French84afc292005-12-02 13:32:45 -0800107{
Steve Frenche9917a02006-03-31 21:22:00 +0000108 int i;
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500109 int rc;
Steve French84afc292005-12-02 13:32:45 -0800110
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500111 if (iov == NULL || signature == NULL || server == NULL)
Steve Frenche9917a02006-03-31 21:22:00 +0000112 return -EINVAL;
Steve French84afc292005-12-02 13:32:45 -0800113
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500114 if (!server->secmech.sdescmd5) {
115 cERROR(1, "%s: Can't generate signature\n", __func__);
116 return -1;
117 }
118
119 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
120 if (rc) {
121 cERROR(1, "%s: Oould not init md5\n", __func__);
122 return rc;
123 }
124
125 crypto_shash_update(&server->secmech.sdescmd5->shash,
126 server->session_key.response, server->session_key.len);
127
Steve French50c2f752007-07-13 00:33:32 +0000128 for (i = 0; i < n_vec; i++) {
Jeff Layton745542e2007-11-03 04:34:04 +0000129 if (iov[i].iov_len == 0)
130 continue;
Steve Frenchffdd6e42007-06-24 21:15:44 +0000131 if (iov[i].iov_base == NULL) {
Steve French56234e22010-09-08 20:57:05 +0000132 cERROR(1, "null iovec entry");
Steve Frenche9917a02006-03-31 21:22:00 +0000133 return -EIO;
Jeff Layton745542e2007-11-03 04:34:04 +0000134 }
Steve Frenchffdd6e42007-06-24 21:15:44 +0000135 /* The first entry includes a length field (which does not get
Steve Frenche9917a02006-03-31 21:22:00 +0000136 signed that occupies the first 4 bytes before the header */
Steve Frenchffdd6e42007-06-24 21:15:44 +0000137 if (i == 0) {
Steve French63d25832007-11-05 21:46:10 +0000138 if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
Steve Frenche9917a02006-03-31 21:22:00 +0000139 break; /* nothing to sign or corrupt header */
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500140 crypto_shash_update(&server->secmech.sdescmd5->shash,
141 iov[i].iov_base + 4, iov[i].iov_len - 4);
Steve Frenche9917a02006-03-31 21:22:00 +0000142 } else
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500143 crypto_shash_update(&server->secmech.sdescmd5->shash,
144 iov[i].iov_base, iov[i].iov_len);
Steve Frenche9917a02006-03-31 21:22:00 +0000145 }
Steve French84afc292005-12-02 13:32:45 -0800146
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500147 rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
Steve French84afc292005-12-02 13:32:45 -0800148
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500149 return rc;
Steve French84afc292005-12-02 13:32:45 -0800150}
151
Steve Frenchffdd6e42007-06-24 21:15:44 +0000152int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
Steve French63d25832007-11-05 21:46:10 +0000153 __u32 *pexpected_response_sequence_number)
Steve French84afc292005-12-02 13:32:45 -0800154{
155 int rc = 0;
156 char smb_signature[20];
Steve Frenchffdd6e42007-06-24 21:15:44 +0000157 struct smb_hdr *cifs_pdu = iov[0].iov_base;
Steve French84afc292005-12-02 13:32:45 -0800158
Steve Frenchffdd6e42007-06-24 21:15:44 +0000159 if ((cifs_pdu == NULL) || (server == NULL))
Steve French84afc292005-12-02 13:32:45 -0800160 return -EINVAL;
161
Steve Frenchffdd6e42007-06-24 21:15:44 +0000162 if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
Steve French84afc292005-12-02 13:32:45 -0800163 return rc;
164
Steve Frenchffdd6e42007-06-24 21:15:44 +0000165 spin_lock(&GlobalMid_Lock);
166 cifs_pdu->Signature.Sequence.SequenceNumber =
Steve French84afc292005-12-02 13:32:45 -0800167 cpu_to_le32(server->sequence_number);
Steve Frenchffdd6e42007-06-24 21:15:44 +0000168 cifs_pdu->Signature.Sequence.Reserved = 0;
Steve French84afc292005-12-02 13:32:45 -0800169
Steve Frenchffdd6e42007-06-24 21:15:44 +0000170 *pexpected_response_sequence_number = server->sequence_number++;
171 server->sequence_number++;
172 spin_unlock(&GlobalMid_Lock);
Steve French84afc292005-12-02 13:32:45 -0800173
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500174 rc = cifs_calc_signature2(iov, n_vec, server, smb_signature);
Steve Frenchffdd6e42007-06-24 21:15:44 +0000175 if (rc)
176 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
177 else
178 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
Steve French84afc292005-12-02 13:32:45 -0800179
Steve Frenchffdd6e42007-06-24 21:15:44 +0000180 return rc;
Steve French84afc292005-12-02 13:32:45 -0800181}
182
Steve Frenchb609f062007-07-09 07:55:14 +0000183int cifs_verify_signature(struct smb_hdr *cifs_pdu,
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500184 struct TCP_Server_Info *server,
Steve Frenchffdd6e42007-06-24 21:15:44 +0000185 __u32 expected_sequence_number)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186{
Steve Frenchc8e56f12010-09-08 21:10:58 +0000187 unsigned int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 char server_response_sig[8];
189 char what_we_think_sig_should_be[20];
190
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500191 if (cifs_pdu == NULL || server == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 return -EINVAL;
193
194 if (cifs_pdu->Command == SMB_COM_NEGOTIATE)
195 return 0;
196
197 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
Steve French50c2f752007-07-13 00:33:32 +0000198 struct smb_com_lock_req *pSMB =
Steve Frenchffdd6e42007-06-24 21:15:44 +0000199 (struct smb_com_lock_req *)cifs_pdu;
200 if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 return 0;
202 }
203
Steve French50c2f752007-07-13 00:33:32 +0000204 /* BB what if signatures are supposed to be on for session but
205 server does not send one? BB */
206
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 /* Do not need to verify session setups with signature "BSRSPYL " */
Steve French50c2f752007-07-13 00:33:32 +0000208 if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
Joe Perchesb6b38f72010-04-21 03:50:45 +0000209 cFYI(1, "dummy signature received for smb command 0x%x",
210 cifs_pdu->Command);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
212 /* save off the origiginal signature so we can modify the smb and check
213 its signature against what the server sent */
Steve French50c2f752007-07-13 00:33:32 +0000214 memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
Steve French50c2f752007-07-13 00:33:32 +0000216 cifs_pdu->Signature.Sequence.SequenceNumber =
217 cpu_to_le32(expected_sequence_number);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 cifs_pdu->Signature.Sequence.Reserved = 0;
219
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500220 rc = cifs_calculate_signature(cifs_pdu, server,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 what_we_think_sig_should_be);
222
Steve French50c2f752007-07-13 00:33:32 +0000223 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 return rc;
225
Steve French50c2f752007-07-13 00:33:32 +0000226/* cifs_dump_mem("what we think it should be: ",
227 what_we_think_sig_should_be, 16); */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
Steve French50c2f752007-07-13 00:33:32 +0000229 if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 return -EACCES;
231 else
232 return 0;
233
234}
235
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500236/* first calculate 24 bytes ntlm response and then 16 byte session key */
237int setup_ntlm_response(struct cifsSesInfo *ses)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238{
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500239 unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
240 char temp_key[CIFS_SESS_KEY_SIZE];
241
242 if (!ses)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 return -EINVAL;
244
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500245 ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
246 if (!ses->auth_key.response) {
247 cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len);
248 return -ENOMEM;
249 }
250 ses->auth_key.len = temp_len;
251
Shirish Pargaonkard3ba50b2010-10-27 15:20:36 -0500252 SMBNTencrypt(ses->password, ses->server->cryptkey,
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500253 ses->auth_key.response + CIFS_SESS_KEY_SIZE);
254
255 E_md4hash(ses->password, temp_key);
256 mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
257
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 return 0;
259}
260
Steve French7c7b25b2006-06-01 19:20:10 +0000261#ifdef CONFIG_CIFS_WEAK_PW_HASH
Jeff Layton4e53a3f2008-12-05 20:41:21 -0500262void calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
263 char *lnm_session_key)
Steve French7c7b25b2006-06-01 19:20:10 +0000264{
265 int i;
266 char password_with_pad[CIFS_ENCPWD_SIZE];
267
268 memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
Jeff Layton4e53a3f2008-12-05 20:41:21 -0500269 if (password)
270 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
Steve French7c7b25b2006-06-01 19:20:10 +0000271
Jeff Layton04912d62010-04-24 07:57:45 -0400272 if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
Jeff Layton4e53a3f2008-12-05 20:41:21 -0500273 memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
274 memcpy(lnm_session_key, password_with_pad,
275 CIFS_ENCPWD_SIZE);
276 return;
277 }
Steve Frenchbdc4bf6e2006-06-02 22:57:13 +0000278
Steve French7c7b25b2006-06-01 19:20:10 +0000279 /* calculate old style session key */
280 /* calling toupper is less broken than repeatedly
281 calling nls_toupper would be since that will never
282 work for UTF8, but neither handles multibyte code pages
283 but the only alternative would be converting to UCS-16 (Unicode)
284 (using a routine something like UniStrupr) then
285 uppercasing and then converting back from Unicode - which
286 would only worth doing it if we knew it were utf8. Basically
287 utf8 and other multibyte codepages each need their own strupper
288 function since a byte at a time will ont work. */
289
Shirish Pargaonkaref571ca2008-07-24 15:56:05 +0000290 for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
Steve French7c7b25b2006-06-01 19:20:10 +0000291 password_with_pad[i] = toupper(password_with_pad[i]);
Steve French7c7b25b2006-06-01 19:20:10 +0000292
Jeff Layton4e53a3f2008-12-05 20:41:21 -0500293 SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
294
Steve French7c7b25b2006-06-01 19:20:10 +0000295 /* clear password before we return/free memory */
296 memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
297}
298#endif /* CIFS_WEAK_PW_HASH */
299
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500300/* Build a proper attribute value/target info pairs blob.
301 * Fill in netbios and dns domain name and workstation name
302 * and client time (total five av pairs and + one end of fields indicator.
303 * Allocate domain name which gets freed when session struct is deallocated.
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500304 */
305static int
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500306build_avpair_blob(struct cifsSesInfo *ses, const struct nls_table *nls_cp)
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500307{
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500308 unsigned int dlen;
309 unsigned int wlen;
310 unsigned int size = 6 * sizeof(struct ntlmssp2_name);
311 __le64 curtime;
312 char *defdmname = "WORKGROUP";
313 unsigned char *blobptr;
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500314 struct ntlmssp2_name *attrptr;
315
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500316 if (!ses->domainName) {
317 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
318 if (!ses->domainName)
319 return -ENOMEM;
320 }
321
322 dlen = strlen(ses->domainName);
323 wlen = strlen(ses->server->hostname);
324
325 /* The length of this blob is a size which is
326 * six times the size of a structure which holds name/size +
327 * two times the unicode length of a domain name +
328 * two times the unicode length of a server name +
329 * size of a timestamp (which is 8 bytes).
330 */
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500331 ses->auth_key.len = size + 2 * (2 * dlen) + 2 * (2 * wlen) + 8;
332 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
333 if (!ses->auth_key.response) {
334 ses->auth_key.len = 0;
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500335 cERROR(1, "Challenge target info allocation failure");
336 return -ENOMEM;
337 }
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500338
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500339 blobptr = ses->auth_key.response;
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500340 attrptr = (struct ntlmssp2_name *) blobptr;
341
342 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
343 attrptr->length = cpu_to_le16(2 * dlen);
344 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
345 cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
346
347 blobptr += 2 * dlen;
348 attrptr = (struct ntlmssp2_name *) blobptr;
349
350 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_COMPUTER_NAME);
351 attrptr->length = cpu_to_le16(2 * wlen);
352 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
353 cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp);
354
355 blobptr += 2 * wlen;
356 attrptr = (struct ntlmssp2_name *) blobptr;
357
358 attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_DOMAIN_NAME);
359 attrptr->length = cpu_to_le16(2 * dlen);
360 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
361 cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
362
363 blobptr += 2 * dlen;
364 attrptr = (struct ntlmssp2_name *) blobptr;
365
366 attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_COMPUTER_NAME);
367 attrptr->length = cpu_to_le16(2 * wlen);
368 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
369 cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp);
370
371 blobptr += 2 * wlen;
372 attrptr = (struct ntlmssp2_name *) blobptr;
373
374 attrptr->type = cpu_to_le16(NTLMSSP_AV_TIMESTAMP);
375 attrptr->length = cpu_to_le16(sizeof(__le64));
376 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
377 curtime = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
378 memcpy(blobptr, &curtime, sizeof(__le64));
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500379
380 return 0;
381}
382
383/* Server has provided av pairs/target info in the type 2 challenge
384 * packet and we have plucked it and stored within smb session.
385 * We parse that blob here to find netbios domain name to be used
386 * as part of ntlmv2 authentication (in Target String), if not already
387 * specified on the command line.
388 * If this function returns without any error but without fetching
389 * domain name, authentication may fail against some server but
390 * may not fail against other (those who are not very particular
391 * about target string i.e. for some, just user name might suffice.
392 */
393static int
Shirish Pargaonkarf7c5445a2010-10-26 18:10:24 -0500394find_domain_name(struct cifsSesInfo *ses, const struct nls_table *nls_cp)
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500395{
396 unsigned int attrsize;
397 unsigned int type;
398 unsigned int onesize = sizeof(struct ntlmssp2_name);
399 unsigned char *blobptr;
400 unsigned char *blobend;
401 struct ntlmssp2_name *attrptr;
402
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500403 if (!ses->auth_key.len || !ses->auth_key.response)
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500404 return 0;
405
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500406 blobptr = ses->auth_key.response;
407 blobend = blobptr + ses->auth_key.len;
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500408
409 while (blobptr + onesize < blobend) {
410 attrptr = (struct ntlmssp2_name *) blobptr;
411 type = le16_to_cpu(attrptr->type);
412 if (type == NTLMSSP_AV_EOL)
413 break;
414 blobptr += 2; /* advance attr type */
415 attrsize = le16_to_cpu(attrptr->length);
416 blobptr += 2; /* advance attr size */
417 if (blobptr + attrsize > blobend)
418 break;
419 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
420 if (!attrsize)
421 break;
422 if (!ses->domainName) {
423 ses->domainName =
424 kmalloc(attrsize + 1, GFP_KERNEL);
425 if (!ses->domainName)
426 return -ENOMEM;
427 cifs_from_ucs2(ses->domainName,
428 (__le16 *)blobptr, attrsize, attrsize,
Shirish Pargaonkarf7c5445a2010-10-26 18:10:24 -0500429 nls_cp, false);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500430 break;
431 }
432 }
433 blobptr += attrsize; /* advance attr value */
434 }
435
436 return 0;
437}
438
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500439static int calc_ntlmv2_hash(struct cifsSesInfo *ses, char *ntlmv2_hash,
Steve French50c2f752007-07-13 00:33:32 +0000440 const struct nls_table *nls_cp)
Steve Frencha8ee0342006-06-05 23:34:19 +0000441{
442 int rc = 0;
443 int len;
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500444 char nt_hash[CIFS_NTHASH_SIZE];
Steve French50c2f752007-07-13 00:33:32 +0000445 wchar_t *user;
446 wchar_t *domain;
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500447 wchar_t *server;
Steve Frenchc8e56f12010-09-08 21:10:58 +0000448
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500449 if (!ses->server->secmech.sdeschmacmd5) {
450 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
451 return -1;
452 }
Steve Frencha8ee0342006-06-05 23:34:19 +0000453
454 /* calculate md4 hash of password */
455 E_md4hash(ses->password, nt_hash);
456
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500457 crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
458 CIFS_NTHASH_SIZE);
459
460 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
461 if (rc) {
462 cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5\n");
463 return rc;
464 }
Steve Frencha8ee0342006-06-05 23:34:19 +0000465
466 /* convert ses->userName to unicode and uppercase */
Steve French1717ffc2006-06-08 05:41:32 +0000467 len = strlen(ses->userName);
468 user = kmalloc(2 + (len * 2), GFP_KERNEL);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500469 if (user == NULL) {
470 cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n");
471 rc = -ENOMEM;
Steve French1717ffc2006-06-08 05:41:32 +0000472 goto calc_exit_2;
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500473 }
Cyril Gorcunov8f2376a2007-10-14 17:58:43 +0000474 len = cifs_strtoUCS((__le16 *)user, ses->userName, len, nls_cp);
Steve French1717ffc2006-06-08 05:41:32 +0000475 UniStrupr(user);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500476
477 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
478 (char *)user, 2 * len);
Steve Frencha8ee0342006-06-05 23:34:19 +0000479
480 /* convert ses->domainName to unicode and uppercase */
Steve French50c2f752007-07-13 00:33:32 +0000481 if (ses->domainName) {
Steve French1717ffc2006-06-08 05:41:32 +0000482 len = strlen(ses->domainName);
Steve Frencha8ee0342006-06-05 23:34:19 +0000483
Steve French50c2f752007-07-13 00:33:32 +0000484 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500485 if (domain == NULL) {
486 cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure");
487 rc = -ENOMEM;
Steve French1717ffc2006-06-08 05:41:32 +0000488 goto calc_exit_1;
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500489 }
Cyril Gorcunov8f2376a2007-10-14 17:58:43 +0000490 len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len,
491 nls_cp);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500492 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
493 (char *)domain, 2 * len);
Steve French1717ffc2006-06-08 05:41:32 +0000494 kfree(domain);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500495 } else if (ses->serverName) {
496 len = strlen(ses->serverName);
497
498 server = kmalloc(2 + (len * 2), GFP_KERNEL);
499 if (server == NULL) {
500 cERROR(1, "calc_ntlmv2_hash: server mem alloc failure");
501 rc = -ENOMEM;
502 goto calc_exit_1;
503 }
504 len = cifs_strtoUCS((__le16 *)server, ses->serverName, len,
505 nls_cp);
506 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
507 (char *)server, 2 * len);
508 kfree(server);
Steve French1717ffc2006-06-08 05:41:32 +0000509 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500510
511 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500512 ntlmv2_hash);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500513
Steve French1717ffc2006-06-08 05:41:32 +0000514calc_exit_1:
515 kfree(user);
516calc_exit_2:
Steve Frencha8ee0342006-06-05 23:34:19 +0000517 return rc;
518}
519
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500520static int
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500521CalcNTLMv2_response(const struct cifsSesInfo *ses, char *ntlmv2_hash)
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500522{
523 int rc;
524 unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
525
526 if (!ses->server->secmech.sdeschmacmd5) {
527 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
528 return -1;
529 }
530
531 crypto_shash_setkey(ses->server->secmech.hmacmd5,
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500532 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500533
534 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
535 if (rc) {
536 cERROR(1, "CalcNTLMv2_response: could not init hmacmd5");
537 return rc;
538 }
539
Shirish Pargaonkard3ba50b2010-10-27 15:20:36 -0500540 if (ses->server->secType == RawNTLMSSP)
541 memcpy(ses->auth_key.response + offset,
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500542 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
Shirish Pargaonkard3ba50b2010-10-27 15:20:36 -0500543 else
544 memcpy(ses->auth_key.response + offset,
545 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500546 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
547 ses->auth_key.response + offset, ses->auth_key.len - offset);
548
549 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
550 ses->auth_key.response + CIFS_SESS_KEY_SIZE);
551
552 return rc;
553}
554
555
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500556int
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500557setup_ntlmv2_rsp(struct cifsSesInfo *ses, const struct nls_table *nls_cp)
Steve French9fbc5902010-08-20 20:42:26 +0000558{
Steve Frenchc8e56f12010-09-08 21:10:58 +0000559 int rc;
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500560 int baselen;
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500561 unsigned int tilen;
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500562 struct ntlmv2_resp *buf;
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500563 char ntlmv2_hash[16];
564 unsigned char *tiblob = NULL; /* target info blob */
Steve French6d027cf2006-06-05 16:26:05 +0000565
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500566 if (ses->server->secType == RawNTLMSSP) {
567 if (!ses->domainName) {
Shirish Pargaonkarf7c5445a2010-10-26 18:10:24 -0500568 rc = find_domain_name(ses, nls_cp);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500569 if (rc) {
570 cERROR(1, "error %d finding domain name", rc);
571 goto setup_ntlmv2_rsp_ret;
572 }
573 }
574 } else {
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500575 rc = build_avpair_blob(ses, nls_cp);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500576 if (rc) {
577 cERROR(1, "error %d building av pair blob", rc);
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500578 goto setup_ntlmv2_rsp_ret;
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500579 }
580 }
Steve Frencha8ee0342006-06-05 23:34:19 +0000581
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500582 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500583 tilen = ses->auth_key.len;
584 tiblob = ses->auth_key.response;
585
586 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500587 if (!ses->auth_key.response) {
588 rc = ENOMEM;
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500589 ses->auth_key.len = 0;
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500590 cERROR(1, "%s: Can't allocate auth blob", __func__);
591 goto setup_ntlmv2_rsp_ret;
592 }
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500593 ses->auth_key.len += baselen;
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500594
595 buf = (struct ntlmv2_resp *)
596 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
597 buf->blob_signature = cpu_to_le32(0x00000101);
598 buf->reserved = 0;
599 buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
600 get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
601 buf->reserved2 = 0;
602
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500603 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500604
Shirish Pargaonkarf7c5445a2010-10-26 18:10:24 -0500605 /* calculate ntlmv2_hash */
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500606 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500607 if (rc) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000608 cERROR(1, "could not get v2 hash rc %d", rc);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500609 goto setup_ntlmv2_rsp_ret;
610 }
Shirish Pargaonkarf7c5445a2010-10-26 18:10:24 -0500611
612 /* calculate first part of the client response (CR1) */
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500613 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500614 if (rc) {
615 cERROR(1, "Could not calculate CR1 rc: %d", rc);
616 goto setup_ntlmv2_rsp_ret;
617 }
Steve Frenchb609f062007-07-09 07:55:14 +0000618
Shirish Pargaonkar5d0d2882010-10-13 18:15:00 -0500619 /* now calculate the session key for NTLMv2 */
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500620 crypto_shash_setkey(ses->server->secmech.hmacmd5,
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500621 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500622
623 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
624 if (rc) {
625 cERROR(1, "%s: Could not init hmacmd5\n", __func__);
626 goto setup_ntlmv2_rsp_ret;
627 }
628
629 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
630 ses->auth_key.response + CIFS_SESS_KEY_SIZE,
631 CIFS_HMAC_MD5_HASH_SIZE);
632
633 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
634 ses->auth_key.response);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500635
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500636setup_ntlmv2_rsp_ret:
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500637 kfree(tiblob);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500638
639 return rc;
Steve French6d027cf2006-06-05 16:26:05 +0000640}
641
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500642int
643calc_seckey(struct cifsSesInfo *ses)
644{
645 int rc;
646 struct crypto_blkcipher *tfm_arc4;
647 struct scatterlist sgin, sgout;
648 struct blkcipher_desc desc;
649 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
650
651 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
652
653 tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
654 if (!tfm_arc4 || IS_ERR(tfm_arc4)) {
655 cERROR(1, "could not allocate crypto API arc4\n");
656 return PTR_ERR(tfm_arc4);
657 }
658
659 desc.tfm = tfm_arc4;
660
661 crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
662 CIFS_SESS_KEY_SIZE);
663
664 sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500665 sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500666
667 rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
668 if (rc) {
669 cERROR(1, "could not encrypt session key rc: %d\n", rc);
670 crypto_free_blkcipher(tfm_arc4);
671 return rc;
672 }
673
674 /* make secondary_key/nonce as session key */
675 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
676 /* and make len as that of session key only */
677 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
678
679 crypto_free_blkcipher(tfm_arc4);
680
681 return 0;
682}
683
684void
685cifs_crypto_shash_release(struct TCP_Server_Info *server)
686{
687 if (server->secmech.md5)
688 crypto_free_shash(server->secmech.md5);
689
690 if (server->secmech.hmacmd5)
691 crypto_free_shash(server->secmech.hmacmd5);
692
693 kfree(server->secmech.sdeschmacmd5);
694
695 kfree(server->secmech.sdescmd5);
696}
697
698int
699cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
700{
701 int rc;
702 unsigned int size;
703
704 server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
705 if (!server->secmech.hmacmd5 ||
706 IS_ERR(server->secmech.hmacmd5)) {
707 cERROR(1, "could not allocate crypto hmacmd5\n");
708 return PTR_ERR(server->secmech.hmacmd5);
709 }
710
711 server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
712 if (!server->secmech.md5 || IS_ERR(server->secmech.md5)) {
713 cERROR(1, "could not allocate crypto md5\n");
714 rc = PTR_ERR(server->secmech.md5);
715 goto crypto_allocate_md5_fail;
716 }
717
718 size = sizeof(struct shash_desc) +
719 crypto_shash_descsize(server->secmech.hmacmd5);
720 server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
721 if (!server->secmech.sdeschmacmd5) {
722 cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5\n");
723 rc = -ENOMEM;
724 goto crypto_allocate_hmacmd5_sdesc_fail;
725 }
726 server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
727 server->secmech.sdeschmacmd5->shash.flags = 0x0;
728
729
730 size = sizeof(struct shash_desc) +
731 crypto_shash_descsize(server->secmech.md5);
732 server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
733 if (!server->secmech.sdescmd5) {
734 cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5\n");
735 rc = -ENOMEM;
736 goto crypto_allocate_md5_sdesc_fail;
737 }
738 server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
739 server->secmech.sdescmd5->shash.flags = 0x0;
740
741 return 0;
742
743crypto_allocate_md5_sdesc_fail:
744 kfree(server->secmech.sdeschmacmd5);
745
746crypto_allocate_hmacmd5_sdesc_fail:
747 crypto_free_shash(server->secmech.md5);
748
749crypto_allocate_md5_fail:
750 crypto_free_shash(server->secmech.hmacmd5);
751
752 return rc;
753}