blob: 4ac7445e6ec70516848e942f54a6846a8541113b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/cifs/cifsencrypt.c
3 *
Steve French95dc8dd2013-07-04 10:35:21 -05004 * Copyright (C) International Business Machines Corp., 2005,2013
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"
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include "cifs_unicode.h"
28#include "cifsproto.h"
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -050029#include "ntlmssp.h"
Steve French7c7b25b2006-06-01 19:20:10 +000030#include <linux/ctype.h>
Steve French6d027cf2006-06-05 16:26:05 +000031#include <linux/random.h>
Jeff Laytonfb308a62012-09-18 16:20:35 -070032#include <linux/highmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Steve French95dc8dd2013-07-04 10:35:21 -050034static int
35cifs_crypto_shash_md5_allocate(struct TCP_Server_Info *server)
36{
37 int rc;
38 unsigned int size;
39
40 if (server->secmech.sdescmd5 != NULL)
41 return 0; /* already allocated */
42
43 server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
44 if (IS_ERR(server->secmech.md5)) {
45 cifs_dbg(VFS, "could not allocate crypto md5\n");
Jeff Laytonba482022013-07-31 13:48:00 -040046 rc = PTR_ERR(server->secmech.md5);
47 server->secmech.md5 = NULL;
48 return rc;
Steve French95dc8dd2013-07-04 10:35:21 -050049 }
50
51 size = sizeof(struct shash_desc) +
52 crypto_shash_descsize(server->secmech.md5);
53 server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
54 if (!server->secmech.sdescmd5) {
Steve French95dc8dd2013-07-04 10:35:21 -050055 crypto_free_shash(server->secmech.md5);
56 server->secmech.md5 = NULL;
Jeff Laytonba482022013-07-31 13:48:00 -040057 return -ENOMEM;
Steve French95dc8dd2013-07-04 10:35:21 -050058 }
59 server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
60 server->secmech.sdescmd5->shash.flags = 0x0;
61
62 return 0;
63}
64
Jeff Layton157c2492011-04-02 07:34:30 -040065/*
66 * Calculate and return the CIFS signature based on the mac key and SMB PDU.
67 * The 16 byte signature must be allocated by the caller. Note we only use the
68 * 1st eight bytes and that the smb header signature field on input contains
69 * the sequence number before this function is called. Also, this function
70 * should be called with the server->srv_mutex held.
71 */
Jeff Laytonbf5ea0e2012-09-18 16:20:34 -070072static int cifs_calc_signature(struct smb_rqst *rqst,
Jeff Layton826a95e2011-10-11 06:41:32 -040073 struct TCP_Server_Info *server, char *signature)
Steve French84afc292005-12-02 13:32:45 -080074{
Steve Frenche9917a02006-03-31 21:22:00 +000075 int i;
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -050076 int rc;
Jeff Laytonbf5ea0e2012-09-18 16:20:34 -070077 struct kvec *iov = rqst->rq_iov;
78 int n_vec = rqst->rq_nvec;
Steve French84afc292005-12-02 13:32:45 -080079
Shirish Pargaonkar21e73392010-10-21 06:42:55 -050080 if (iov == NULL || signature == NULL || server == NULL)
Steve Frenche9917a02006-03-31 21:22:00 +000081 return -EINVAL;
Steve French84afc292005-12-02 13:32:45 -080082
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -050083 if (!server->secmech.sdescmd5) {
Steve French95dc8dd2013-07-04 10:35:21 -050084 rc = cifs_crypto_shash_md5_allocate(server);
85 if (rc) {
86 cifs_dbg(VFS, "%s: Can't alloc md5 crypto\n", __func__);
87 return -1;
88 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -050089 }
90
91 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
92 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -050093 cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -050094 return rc;
95 }
96
Shirish Pargaonkar14cae322011-06-20 16:14:03 -050097 rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -050098 server->session_key.response, server->session_key.len);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -050099 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500100 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500101 return rc;
102 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500103
Steve French50c2f752007-07-13 00:33:32 +0000104 for (i = 0; i < n_vec; i++) {
Jeff Layton745542e2007-11-03 04:34:04 +0000105 if (iov[i].iov_len == 0)
106 continue;
Steve Frenchffdd6e42007-06-24 21:15:44 +0000107 if (iov[i].iov_base == NULL) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500108 cifs_dbg(VFS, "null iovec entry\n");
Steve Frenche9917a02006-03-31 21:22:00 +0000109 return -EIO;
Jeff Layton745542e2007-11-03 04:34:04 +0000110 }
Steve Frenchffdd6e42007-06-24 21:15:44 +0000111 /* The first entry includes a length field (which does not get
Steve Frenche9917a02006-03-31 21:22:00 +0000112 signed that occupies the first 4 bytes before the header */
Steve Frenchffdd6e42007-06-24 21:15:44 +0000113 if (i == 0) {
Steve French63d25832007-11-05 21:46:10 +0000114 if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
Steve Frenche9917a02006-03-31 21:22:00 +0000115 break; /* nothing to sign or corrupt header */
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500116 rc =
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500117 crypto_shash_update(&server->secmech.sdescmd5->shash,
118 iov[i].iov_base + 4, iov[i].iov_len - 4);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500119 } else {
120 rc =
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500121 crypto_shash_update(&server->secmech.sdescmd5->shash,
122 iov[i].iov_base, iov[i].iov_len);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500123 }
124 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500125 cifs_dbg(VFS, "%s: Could not update with payload\n",
126 __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500127 return rc;
128 }
Steve Frenche9917a02006-03-31 21:22:00 +0000129 }
Steve French84afc292005-12-02 13:32:45 -0800130
Jeff Laytonfb308a62012-09-18 16:20:35 -0700131 /* now hash over the rq_pages array */
132 for (i = 0; i < rqst->rq_npages; i++) {
133 struct kvec p_iov;
134
135 cifs_rqst_page_to_kvec(rqst, i, &p_iov);
136 crypto_shash_update(&server->secmech.sdescmd5->shash,
137 p_iov.iov_base, p_iov.iov_len);
138 kunmap(rqst->rq_pages[i]);
139 }
140
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500141 rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500142 if (rc)
Joe Perchesf96637b2013-05-04 22:12:25 -0500143 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
Steve French84afc292005-12-02 13:32:45 -0800144
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500145 return rc;
Steve French84afc292005-12-02 13:32:45 -0800146}
147
Jeff Laytona0f8b4f2011-01-07 11:30:28 -0500148/* must be called with server->srv_mutex held */
Jeff Laytonbf5ea0e2012-09-18 16:20:34 -0700149int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
Steve French63d25832007-11-05 21:46:10 +0000150 __u32 *pexpected_response_sequence_number)
Steve French84afc292005-12-02 13:32:45 -0800151{
152 int rc = 0;
153 char smb_signature[20];
Jeff Laytonbf5ea0e2012-09-18 16:20:34 -0700154 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
Steve French84afc292005-12-02 13:32:45 -0800155
Steve Frenchffdd6e42007-06-24 21:15:44 +0000156 if ((cifs_pdu == NULL) || (server == NULL))
Steve French84afc292005-12-02 13:32:45 -0800157 return -EINVAL;
158
Jeff Layton998d6fc2011-07-26 12:21:17 -0400159 if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
160 server->tcpStatus == CifsNeedNegotiate)
Steve French84afc292005-12-02 13:32:45 -0800161 return rc;
162
Jeff Layton998d6fc2011-07-26 12:21:17 -0400163 if (!server->session_estab) {
Jeff Laytonb4dacbc2011-10-11 06:41:32 -0400164 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
Jeff Layton998d6fc2011-07-26 12:21:17 -0400165 return rc;
166 }
167
Steve Frenchffdd6e42007-06-24 21:15:44 +0000168 cifs_pdu->Signature.Sequence.SequenceNumber =
Steve French84afc292005-12-02 13:32:45 -0800169 cpu_to_le32(server->sequence_number);
Steve Frenchffdd6e42007-06-24 21:15:44 +0000170 cifs_pdu->Signature.Sequence.Reserved = 0;
Steve French84afc292005-12-02 13:32:45 -0800171
Jeff Layton0124cc42013-04-03 11:55:03 -0400172 *pexpected_response_sequence_number = ++server->sequence_number;
173 ++server->sequence_number;
Steve French84afc292005-12-02 13:32:45 -0800174
Jeff Laytonbf5ea0e2012-09-18 16:20:34 -0700175 rc = cifs_calc_signature(rqst, server, smb_signature);
Steve Frenchffdd6e42007-06-24 21:15:44 +0000176 if (rc)
177 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
178 else
179 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
Steve French84afc292005-12-02 13:32:45 -0800180
Steve Frenchffdd6e42007-06-24 21:15:44 +0000181 return rc;
Steve French84afc292005-12-02 13:32:45 -0800182}
183
Jeff Laytonbf5ea0e2012-09-18 16:20:34 -0700184int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
185 __u32 *pexpected_response_sequence)
186{
187 struct smb_rqst rqst = { .rq_iov = iov,
188 .rq_nvec = n_vec };
189
190 return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
191}
192
Jeff Layton826a95e2011-10-11 06:41:32 -0400193/* must be called with server->srv_mutex held */
194int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
195 __u32 *pexpected_response_sequence_number)
196{
197 struct kvec iov;
198
199 iov.iov_base = cifs_pdu;
200 iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4;
201
Jeff Layton762a4202012-07-23 13:28:38 -0400202 return cifs_sign_smbv(&iov, 1, server,
Jeff Layton826a95e2011-10-11 06:41:32 -0400203 pexpected_response_sequence_number);
204}
205
Jeff Laytonbf5ea0e2012-09-18 16:20:34 -0700206int cifs_verify_signature(struct smb_rqst *rqst,
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500207 struct TCP_Server_Info *server,
Steve Frenchffdd6e42007-06-24 21:15:44 +0000208 __u32 expected_sequence_number)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209{
Steve Frenchc8e56f12010-09-08 21:10:58 +0000210 unsigned int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 char server_response_sig[8];
212 char what_we_think_sig_should_be[20];
Jeff Laytonbf5ea0e2012-09-18 16:20:34 -0700213 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500215 if (cifs_pdu == NULL || server == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 return -EINVAL;
217
Jeff Layton9c4843e2011-06-06 15:40:23 -0400218 if (!server->session_estab)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 return 0;
220
221 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
Steve French50c2f752007-07-13 00:33:32 +0000222 struct smb_com_lock_req *pSMB =
Steve Frenchffdd6e42007-06-24 21:15:44 +0000223 (struct smb_com_lock_req *)cifs_pdu;
224 if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 return 0;
226 }
227
Steve French50c2f752007-07-13 00:33:32 +0000228 /* BB what if signatures are supposed to be on for session but
229 server does not send one? BB */
230
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 /* Do not need to verify session setups with signature "BSRSPYL " */
Steve French50c2f752007-07-13 00:33:32 +0000232 if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
Joe Perchesf96637b2013-05-04 22:12:25 -0500233 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
234 cifs_pdu->Command);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
236 /* save off the origiginal signature so we can modify the smb and check
237 its signature against what the server sent */
Steve French50c2f752007-07-13 00:33:32 +0000238 memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
Steve French50c2f752007-07-13 00:33:32 +0000240 cifs_pdu->Signature.Sequence.SequenceNumber =
241 cpu_to_le32(expected_sequence_number);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 cifs_pdu->Signature.Sequence.Reserved = 0;
243
Jeff Layton157c2492011-04-02 07:34:30 -0400244 mutex_lock(&server->srv_mutex);
Jeff Laytonbf5ea0e2012-09-18 16:20:34 -0700245 rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
Jeff Layton157c2492011-04-02 07:34:30 -0400246 mutex_unlock(&server->srv_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
Steve French50c2f752007-07-13 00:33:32 +0000248 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 return rc;
250
Steve French50c2f752007-07-13 00:33:32 +0000251/* cifs_dump_mem("what we think it should be: ",
252 what_we_think_sig_should_be, 16); */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
Steve French50c2f752007-07-13 00:33:32 +0000254 if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 return -EACCES;
256 else
257 return 0;
258
259}
260
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500261/* first calculate 24 bytes ntlm response and then 16 byte session key */
Shirish Pargaonkar9ef59922011-10-20 13:21:59 -0500262int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263{
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600264 int rc = 0;
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500265 unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
266 char temp_key[CIFS_SESS_KEY_SIZE];
267
268 if (!ses)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 return -EINVAL;
270
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500271 ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
Joe Perchesf96637b2013-05-04 22:12:25 -0500272 if (!ses->auth_key.response)
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500273 return -ENOMEM;
Joe Perchesf96637b2013-05-04 22:12:25 -0500274
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500275 ses->auth_key.len = temp_len;
276
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600277 rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
Shirish Pargaonkar9ef59922011-10-20 13:21:59 -0500278 ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600279 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500280 cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n",
281 __func__, rc);
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600282 return rc;
283 }
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500284
Shirish Pargaonkar9ef59922011-10-20 13:21:59 -0500285 rc = E_md4hash(ses->password, temp_key, nls_cp);
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600286 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500287 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
288 __func__, rc);
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600289 return rc;
290 }
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500291
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600292 rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
293 if (rc)
Joe Perchesf96637b2013-05-04 22:12:25 -0500294 cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n",
295 __func__, rc);
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600296
297 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298}
299
Steve French7c7b25b2006-06-01 19:20:10 +0000300#ifdef CONFIG_CIFS_WEAK_PW_HASH
Steve French43988d72011-04-19 18:23:31 +0000301int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
Jeff Layton4e53a3f2008-12-05 20:41:21 -0500302 char *lnm_session_key)
Steve French7c7b25b2006-06-01 19:20:10 +0000303{
304 int i;
Steve French43988d72011-04-19 18:23:31 +0000305 int rc;
Steve French7c7b25b2006-06-01 19:20:10 +0000306 char password_with_pad[CIFS_ENCPWD_SIZE];
307
308 memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
Jeff Layton4e53a3f2008-12-05 20:41:21 -0500309 if (password)
310 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
Steve French7c7b25b2006-06-01 19:20:10 +0000311
Jeff Layton04912d62010-04-24 07:57:45 -0400312 if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
Jeff Layton4e53a3f2008-12-05 20:41:21 -0500313 memcpy(lnm_session_key, password_with_pad,
314 CIFS_ENCPWD_SIZE);
Steve French43988d72011-04-19 18:23:31 +0000315 return 0;
Jeff Layton4e53a3f2008-12-05 20:41:21 -0500316 }
Steve Frenchbdc4bf6e2006-06-02 22:57:13 +0000317
Steve French7c7b25b2006-06-01 19:20:10 +0000318 /* calculate old style session key */
319 /* calling toupper is less broken than repeatedly
320 calling nls_toupper would be since that will never
321 work for UTF8, but neither handles multibyte code pages
322 but the only alternative would be converting to UCS-16 (Unicode)
323 (using a routine something like UniStrupr) then
324 uppercasing and then converting back from Unicode - which
325 would only worth doing it if we knew it were utf8. Basically
326 utf8 and other multibyte codepages each need their own strupper
327 function since a byte at a time will ont work. */
328
Shirish Pargaonkaref571ca2008-07-24 15:56:05 +0000329 for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
Steve French7c7b25b2006-06-01 19:20:10 +0000330 password_with_pad[i] = toupper(password_with_pad[i]);
Steve French7c7b25b2006-06-01 19:20:10 +0000331
Steve French43988d72011-04-19 18:23:31 +0000332 rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
Jeff Layton4e53a3f2008-12-05 20:41:21 -0500333
Steve French43988d72011-04-19 18:23:31 +0000334 return rc;
Steve French7c7b25b2006-06-01 19:20:10 +0000335}
336#endif /* CIFS_WEAK_PW_HASH */
337
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500338/* Build a proper attribute value/target info pairs blob.
339 * Fill in netbios and dns domain name and workstation name
340 * and client time (total five av pairs and + one end of fields indicator.
341 * Allocate domain name which gets freed when session struct is deallocated.
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500342 */
343static int
Steve French96daf2b2011-05-27 04:34:02 +0000344build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500345{
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500346 unsigned int dlen;
Shirish Pargaonkarcfbd6f82011-08-24 23:05:46 -0500347 unsigned int size = 2 * sizeof(struct ntlmssp2_name);
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500348 char *defdmname = "WORKGROUP";
349 unsigned char *blobptr;
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500350 struct ntlmssp2_name *attrptr;
351
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500352 if (!ses->domainName) {
353 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
354 if (!ses->domainName)
355 return -ENOMEM;
356 }
357
358 dlen = strlen(ses->domainName);
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500359
Shirish Pargaonkarcfbd6f82011-08-24 23:05:46 -0500360 /*
361 * The length of this blob is two times the size of a
362 * structure (av pair) which holds name/size
363 * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
364 * unicode length of a netbios domain name
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500365 */
Shirish Pargaonkarcfbd6f82011-08-24 23:05:46 -0500366 ses->auth_key.len = size + 2 * dlen;
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500367 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
368 if (!ses->auth_key.response) {
369 ses->auth_key.len = 0;
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500370 return -ENOMEM;
371 }
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500372
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500373 blobptr = ses->auth_key.response;
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500374 attrptr = (struct ntlmssp2_name *) blobptr;
375
Shirish Pargaonkarcfbd6f82011-08-24 23:05:46 -0500376 /*
377 * As defined in MS-NTLM 3.3.2, just this av pair field
378 * is sufficient as part of the temp
379 */
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500380 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
381 attrptr->length = cpu_to_le16(2 * dlen);
382 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
Steve Frenchacbbb762012-01-18 22:32:33 -0600383 cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500384
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500385 return 0;
386}
387
388/* Server has provided av pairs/target info in the type 2 challenge
389 * packet and we have plucked it and stored within smb session.
390 * We parse that blob here to find netbios domain name to be used
391 * as part of ntlmv2 authentication (in Target String), if not already
392 * specified on the command line.
393 * If this function returns without any error but without fetching
394 * domain name, authentication may fail against some server but
395 * may not fail against other (those who are not very particular
396 * about target string i.e. for some, just user name might suffice.
397 */
398static int
Steve French96daf2b2011-05-27 04:34:02 +0000399find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500400{
401 unsigned int attrsize;
402 unsigned int type;
403 unsigned int onesize = sizeof(struct ntlmssp2_name);
404 unsigned char *blobptr;
405 unsigned char *blobend;
406 struct ntlmssp2_name *attrptr;
407
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500408 if (!ses->auth_key.len || !ses->auth_key.response)
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500409 return 0;
410
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500411 blobptr = ses->auth_key.response;
412 blobend = blobptr + ses->auth_key.len;
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500413
414 while (blobptr + onesize < blobend) {
415 attrptr = (struct ntlmssp2_name *) blobptr;
416 type = le16_to_cpu(attrptr->type);
417 if (type == NTLMSSP_AV_EOL)
418 break;
419 blobptr += 2; /* advance attr type */
420 attrsize = le16_to_cpu(attrptr->length);
421 blobptr += 2; /* advance attr size */
422 if (blobptr + attrsize > blobend)
423 break;
424 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
Chen Gang057d6332013-07-19 09:01:36 +0800425 if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500426 break;
427 if (!ses->domainName) {
428 ses->domainName =
429 kmalloc(attrsize + 1, GFP_KERNEL);
430 if (!ses->domainName)
431 return -ENOMEM;
Steve Frenchacbbb762012-01-18 22:32:33 -0600432 cifs_from_utf16(ses->domainName,
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500433 (__le16 *)blobptr, attrsize, attrsize,
Steve Frenchb6938552014-09-25 13:20:05 -0500434 nls_cp, NO_MAP_UNI_RSVD);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500435 break;
436 }
437 }
438 blobptr += attrsize; /* advance attr value */
439 }
440
441 return 0;
442}
443
Steve French96daf2b2011-05-27 04:34:02 +0000444static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
Steve French50c2f752007-07-13 00:33:32 +0000445 const struct nls_table *nls_cp)
Steve Frencha8ee0342006-06-05 23:34:19 +0000446{
447 int rc = 0;
448 int len;
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500449 char nt_hash[CIFS_NTHASH_SIZE];
Steve Frenchfdf96a92013-06-25 14:03:16 -0500450 __le16 *user;
Steve French50c2f752007-07-13 00:33:32 +0000451 wchar_t *domain;
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500452 wchar_t *server;
Steve Frenchc8e56f12010-09-08 21:10:58 +0000453
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500454 if (!ses->server->secmech.sdeschmacmd5) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500455 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500456 return -1;
457 }
Steve Frencha8ee0342006-06-05 23:34:19 +0000458
459 /* calculate md4 hash of password */
Shirish Pargaonkar9ef59922011-10-20 13:21:59 -0500460 E_md4hash(ses->password, nt_hash, nls_cp);
Steve Frencha8ee0342006-06-05 23:34:19 +0000461
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500462 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500463 CIFS_NTHASH_SIZE);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500464 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500465 cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500466 return rc;
467 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500468
469 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
470 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500471 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500472 return rc;
473 }
Steve Frencha8ee0342006-06-05 23:34:19 +0000474
Steve Frenchfdf96a92013-06-25 14:03:16 -0500475 /* convert ses->user_name to unicode */
Jeff Layton04febab2012-01-17 16:09:15 -0500476 len = ses->user_name ? strlen(ses->user_name) : 0;
Steve French1717ffc2006-06-08 05:41:32 +0000477 user = kmalloc(2 + (len * 2), GFP_KERNEL);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500478 if (user == NULL) {
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500479 rc = -ENOMEM;
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500480 return rc;
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500481 }
Jeff Layton04febab2012-01-17 16:09:15 -0500482
483 if (len) {
Steve Frenchfdf96a92013-06-25 14:03:16 -0500484 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
Jeff Layton04febab2012-01-17 16:09:15 -0500485 UniStrupr(user);
486 } else {
487 memset(user, '\0', 2);
488 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500489
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500490 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500491 (char *)user, 2 * len);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500492 kfree(user);
493 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500494 cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500495 return rc;
496 }
Steve Frencha8ee0342006-06-05 23:34:19 +0000497
498 /* convert ses->domainName to unicode and uppercase */
Steve French50c2f752007-07-13 00:33:32 +0000499 if (ses->domainName) {
Steve French1717ffc2006-06-08 05:41:32 +0000500 len = strlen(ses->domainName);
Steve Frencha8ee0342006-06-05 23:34:19 +0000501
Steve French50c2f752007-07-13 00:33:32 +0000502 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500503 if (domain == NULL) {
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500504 rc = -ENOMEM;
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500505 return rc;
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500506 }
Steve Frenchacbbb762012-01-18 22:32:33 -0600507 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
508 nls_cp);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500509 rc =
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500510 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
511 (char *)domain, 2 * len);
Steve French1717ffc2006-06-08 05:41:32 +0000512 kfree(domain);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500513 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500514 cifs_dbg(VFS, "%s: Could not update with domain\n",
515 __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500516 return rc;
517 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500518 } else if (ses->serverName) {
519 len = strlen(ses->serverName);
520
521 server = kmalloc(2 + (len * 2), GFP_KERNEL);
522 if (server == NULL) {
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500523 rc = -ENOMEM;
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500524 return rc;
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500525 }
Steve Frenchacbbb762012-01-18 22:32:33 -0600526 len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len,
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500527 nls_cp);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500528 rc =
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500529 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
530 (char *)server, 2 * len);
531 kfree(server);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500532 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500533 cifs_dbg(VFS, "%s: Could not update with server\n",
534 __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500535 return rc;
536 }
Steve French1717ffc2006-06-08 05:41:32 +0000537 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500538
539 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500540 ntlmv2_hash);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500541 if (rc)
Joe Perchesf96637b2013-05-04 22:12:25 -0500542 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500543
Steve Frencha8ee0342006-06-05 23:34:19 +0000544 return rc;
545}
546
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500547static int
Steve French96daf2b2011-05-27 04:34:02 +0000548CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500549{
550 int rc;
Tim Gardner2c957dd2013-11-07 16:40:57 -0700551 struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
552 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
553 unsigned int hash_len;
554
555 /* The MD5 hash starts at challenge_key.key */
556 hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
557 offsetof(struct ntlmv2_resp, challenge.key[0]));
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500558
559 if (!ses->server->secmech.sdeschmacmd5) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500560 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500561 return -1;
562 }
563
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500564 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
Tim Gardner2c957dd2013-11-07 16:40:57 -0700565 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500566 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500567 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
568 __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500569 return rc;
570 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500571
572 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
573 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500574 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500575 return rc;
576 }
577
Jeff Layton3f618222013-06-12 19:52:14 -0500578 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
Tim Gardner2c957dd2013-11-07 16:40:57 -0700579 memcpy(ntlmv2->challenge.key,
580 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
Shirish Pargaonkard3ba50b2010-10-27 15:20:36 -0500581 else
Tim Gardner2c957dd2013-11-07 16:40:57 -0700582 memcpy(ntlmv2->challenge.key,
583 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500584 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
Tim Gardner2c957dd2013-11-07 16:40:57 -0700585 ntlmv2->challenge.key, hash_len);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500586 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500587 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500588 return rc;
589 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500590
Tim Gardner2c957dd2013-11-07 16:40:57 -0700591 /* Note that the MD5 digest over writes anon.challenge_key.key */
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500592 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
Tim Gardner2c957dd2013-11-07 16:40:57 -0700593 ntlmv2->ntlmv2_hash);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500594 if (rc)
Joe Perchesf96637b2013-05-04 22:12:25 -0500595 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500596
597 return rc;
598}
599
Steve French95dc8dd2013-07-04 10:35:21 -0500600static int crypto_hmacmd5_alloc(struct TCP_Server_Info *server)
601{
Jeff Laytonba482022013-07-31 13:48:00 -0400602 int rc;
Steve French95dc8dd2013-07-04 10:35:21 -0500603 unsigned int size;
604
605 /* check if already allocated */
606 if (server->secmech.sdeschmacmd5)
607 return 0;
608
609 server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
610 if (IS_ERR(server->secmech.hmacmd5)) {
611 cifs_dbg(VFS, "could not allocate crypto hmacmd5\n");
Jeff Laytonba482022013-07-31 13:48:00 -0400612 rc = PTR_ERR(server->secmech.hmacmd5);
613 server->secmech.hmacmd5 = NULL;
614 return rc;
Steve French95dc8dd2013-07-04 10:35:21 -0500615 }
616
617 size = sizeof(struct shash_desc) +
618 crypto_shash_descsize(server->secmech.hmacmd5);
619 server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
620 if (!server->secmech.sdeschmacmd5) {
621 crypto_free_shash(server->secmech.hmacmd5);
622 server->secmech.hmacmd5 = NULL;
623 return -ENOMEM;
624 }
625 server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
626 server->secmech.sdeschmacmd5->shash.flags = 0x0;
627
628 return 0;
629}
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500630
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500631int
Steve French96daf2b2011-05-27 04:34:02 +0000632setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
Steve French9fbc5902010-08-20 20:42:26 +0000633{
Steve Frenchc8e56f12010-09-08 21:10:58 +0000634 int rc;
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500635 int baselen;
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500636 unsigned int tilen;
Tim Gardner2c957dd2013-11-07 16:40:57 -0700637 struct ntlmv2_resp *ntlmv2;
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500638 char ntlmv2_hash[16];
639 unsigned char *tiblob = NULL; /* target info blob */
Steve French6d027cf2006-06-05 16:26:05 +0000640
Jeff Layton3f618222013-06-12 19:52:14 -0500641 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500642 if (!ses->domainName) {
Shirish Pargaonkarf7c54452010-10-26 18:10:24 -0500643 rc = find_domain_name(ses, nls_cp);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500644 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500645 cifs_dbg(VFS, "error %d finding domain name\n",
646 rc);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500647 goto setup_ntlmv2_rsp_ret;
648 }
649 }
650 } else {
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500651 rc = build_avpair_blob(ses, nls_cp);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500652 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500653 cifs_dbg(VFS, "error %d building av pair blob\n", rc);
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500654 goto setup_ntlmv2_rsp_ret;
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500655 }
656 }
Steve Frencha8ee0342006-06-05 23:34:19 +0000657
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500658 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500659 tilen = ses->auth_key.len;
660 tiblob = ses->auth_key.response;
661
662 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500663 if (!ses->auth_key.response) {
664 rc = ENOMEM;
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500665 ses->auth_key.len = 0;
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500666 goto setup_ntlmv2_rsp_ret;
667 }
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500668 ses->auth_key.len += baselen;
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500669
Tim Gardner2c957dd2013-11-07 16:40:57 -0700670 ntlmv2 = (struct ntlmv2_resp *)
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500671 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
Tim Gardner2c957dd2013-11-07 16:40:57 -0700672 ntlmv2->blob_signature = cpu_to_le32(0x00000101);
673 ntlmv2->reserved = 0;
674 /* Must be within 5 minutes of the server */
675 ntlmv2->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
676 get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
677 ntlmv2->reserved2 = 0;
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500678
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500679 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500680
Steve French95dc8dd2013-07-04 10:35:21 -0500681 rc = crypto_hmacmd5_alloc(ses->server);
682 if (rc) {
683 cifs_dbg(VFS, "could not crypto alloc hmacmd5 rc %d\n", rc);
684 goto setup_ntlmv2_rsp_ret;
685 }
686
Shirish Pargaonkarf7c54452010-10-26 18:10:24 -0500687 /* calculate ntlmv2_hash */
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500688 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500689 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500690 cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500691 goto setup_ntlmv2_rsp_ret;
692 }
Shirish Pargaonkarf7c54452010-10-26 18:10:24 -0500693
694 /* calculate first part of the client response (CR1) */
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500695 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500696 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500697 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500698 goto setup_ntlmv2_rsp_ret;
699 }
Steve Frenchb609f062007-07-09 07:55:14 +0000700
Shirish Pargaonkar5d0d2882010-10-13 18:15:00 -0500701 /* now calculate the session key for NTLMv2 */
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500702 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500703 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500704 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500705 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
706 __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500707 goto setup_ntlmv2_rsp_ret;
708 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500709
710 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
711 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500712 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500713 goto setup_ntlmv2_rsp_ret;
714 }
715
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500716 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
Tim Gardner2c957dd2013-11-07 16:40:57 -0700717 ntlmv2->ntlmv2_hash,
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500718 CIFS_HMAC_MD5_HASH_SIZE);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500719 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500720 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500721 goto setup_ntlmv2_rsp_ret;
722 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500723
724 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
725 ses->auth_key.response);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500726 if (rc)
Joe Perchesf96637b2013-05-04 22:12:25 -0500727 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500728
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500729setup_ntlmv2_rsp_ret:
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500730 kfree(tiblob);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500731
732 return rc;
Steve French6d027cf2006-06-05 16:26:05 +0000733}
734
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500735int
Steve French96daf2b2011-05-27 04:34:02 +0000736calc_seckey(struct cifs_ses *ses)
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500737{
738 int rc;
739 struct crypto_blkcipher *tfm_arc4;
740 struct scatterlist sgin, sgout;
741 struct blkcipher_desc desc;
742 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
743
744 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
745
746 tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
Shirish Pargaonkar7a8587e2011-01-29 13:54:58 -0600747 if (IS_ERR(tfm_arc4)) {
748 rc = PTR_ERR(tfm_arc4);
Joe Perchesf96637b2013-05-04 22:12:25 -0500749 cifs_dbg(VFS, "could not allocate crypto API arc4\n");
Shirish Pargaonkar7a8587e2011-01-29 13:54:58 -0600750 return rc;
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500751 }
752
753 desc.tfm = tfm_arc4;
754
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500755 rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500756 CIFS_SESS_KEY_SIZE);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500757 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500758 cifs_dbg(VFS, "%s: Could not set response as a key\n",
759 __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500760 return rc;
761 }
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500762
763 sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500764 sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500765
766 rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
767 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500768 cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc);
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500769 crypto_free_blkcipher(tfm_arc4);
770 return rc;
771 }
772
773 /* make secondary_key/nonce as session key */
774 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
775 /* and make len as that of session key only */
776 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
777
778 crypto_free_blkcipher(tfm_arc4);
779
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500780 return rc;
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500781}
782
783void
784cifs_crypto_shash_release(struct TCP_Server_Info *server)
785{
Steve French95dc8dd2013-07-04 10:35:21 -0500786 if (server->secmech.cmacaes) {
Steve French429b46f2013-06-26 23:45:05 -0500787 crypto_free_shash(server->secmech.cmacaes);
Steve French95dc8dd2013-07-04 10:35:21 -0500788 server->secmech.cmacaes = NULL;
789 }
Steve French429b46f2013-06-26 23:45:05 -0500790
Steve French95dc8dd2013-07-04 10:35:21 -0500791 if (server->secmech.hmacsha256) {
Pavel Shilovsky3c1bf7e2012-09-18 16:20:30 -0700792 crypto_free_shash(server->secmech.hmacsha256);
Steve French95dc8dd2013-07-04 10:35:21 -0500793 server->secmech.hmacsha256 = NULL;
794 }
Pavel Shilovsky3c1bf7e2012-09-18 16:20:30 -0700795
Steve French95dc8dd2013-07-04 10:35:21 -0500796 if (server->secmech.md5) {
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500797 crypto_free_shash(server->secmech.md5);
Steve French95dc8dd2013-07-04 10:35:21 -0500798 server->secmech.md5 = NULL;
799 }
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500800
Steve French95dc8dd2013-07-04 10:35:21 -0500801 if (server->secmech.hmacmd5) {
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500802 crypto_free_shash(server->secmech.hmacmd5);
Steve French95dc8dd2013-07-04 10:35:21 -0500803 server->secmech.hmacmd5 = NULL;
804 }
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500805
Steve French429b46f2013-06-26 23:45:05 -0500806 kfree(server->secmech.sdesccmacaes);
Steve French95dc8dd2013-07-04 10:35:21 -0500807 server->secmech.sdesccmacaes = NULL;
Pavel Shilovsky3c1bf7e2012-09-18 16:20:30 -0700808 kfree(server->secmech.sdeschmacsha256);
Steve French95dc8dd2013-07-04 10:35:21 -0500809 server->secmech.sdeschmacsha256 = NULL;
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500810 kfree(server->secmech.sdeschmacmd5);
Steve French95dc8dd2013-07-04 10:35:21 -0500811 server->secmech.sdeschmacmd5 = NULL;
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500812 kfree(server->secmech.sdescmd5);
Steve French95dc8dd2013-07-04 10:35:21 -0500813 server->secmech.sdescmd5 = NULL;
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500814}