blob: aa0dc2573374184597b9e449fad6467f924f0f45 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/cifs/cifsencrypt.c
3 *
Steve French8b7a4542015-03-30 16:58:17 -05004 * Encryption and hashing operations relating to NTLM, NTLMv2. See MS-NLMP
5 * for more detailed information
6 *
Steve French95dc8dd2013-07-04 10:35:21 -05007 * Copyright (C) International Business Machines Corp., 2005,2013
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * Author(s): Steve French (sfrench@us.ibm.com)
9 *
10 * This library is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU Lesser General Public License as published
12 * by the Free Software Foundation; either version 2.1 of the License, or
13 * (at your option) any later version.
14 *
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
18 * the GNU Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this library; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 */
24
25#include <linux/fs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090026#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include "cifspdu.h"
Steve Frenchffdd6e42007-06-24 21:15:44 +000028#include "cifsglob.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include "cifs_debug.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include "cifs_unicode.h"
31#include "cifsproto.h"
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -050032#include "ntlmssp.h"
Steve French7c7b25b2006-06-01 19:20:10 +000033#include <linux/ctype.h>
Steve French6d027cf2006-06-05 16:26:05 +000034#include <linux/random.h>
Jeff Laytonfb308a62012-09-18 16:20:35 -070035#include <linux/highmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Steve French95dc8dd2013-07-04 10:35:21 -050037static int
38cifs_crypto_shash_md5_allocate(struct TCP_Server_Info *server)
39{
40 int rc;
41 unsigned int size;
42
43 if (server->secmech.sdescmd5 != NULL)
44 return 0; /* already allocated */
45
46 server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
47 if (IS_ERR(server->secmech.md5)) {
48 cifs_dbg(VFS, "could not allocate crypto md5\n");
Jeff Laytonba482022013-07-31 13:48:00 -040049 rc = PTR_ERR(server->secmech.md5);
50 server->secmech.md5 = NULL;
51 return rc;
Steve French95dc8dd2013-07-04 10:35:21 -050052 }
53
54 size = sizeof(struct shash_desc) +
55 crypto_shash_descsize(server->secmech.md5);
56 server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
57 if (!server->secmech.sdescmd5) {
Steve French95dc8dd2013-07-04 10:35:21 -050058 crypto_free_shash(server->secmech.md5);
59 server->secmech.md5 = NULL;
Jeff Laytonba482022013-07-31 13:48:00 -040060 return -ENOMEM;
Steve French95dc8dd2013-07-04 10:35:21 -050061 }
62 server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
63 server->secmech.sdescmd5->shash.flags = 0x0;
64
65 return 0;
66}
67
Jeff Layton157c2492011-04-02 07:34:30 -040068/*
69 * Calculate and return the CIFS signature based on the mac key and SMB PDU.
70 * The 16 byte signature must be allocated by the caller. Note we only use the
71 * 1st eight bytes and that the smb header signature field on input contains
72 * the sequence number before this function is called. Also, this function
73 * should be called with the server->srv_mutex held.
74 */
Jeff Laytonbf5ea0e2012-09-18 16:20:34 -070075static int cifs_calc_signature(struct smb_rqst *rqst,
Jeff Layton826a95e2011-10-11 06:41:32 -040076 struct TCP_Server_Info *server, char *signature)
Steve French84afc292005-12-02 13:32:45 -080077{
Steve Frenche9917a02006-03-31 21:22:00 +000078 int i;
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -050079 int rc;
Jeff Laytonbf5ea0e2012-09-18 16:20:34 -070080 struct kvec *iov = rqst->rq_iov;
81 int n_vec = rqst->rq_nvec;
Steve French84afc292005-12-02 13:32:45 -080082
Shirish Pargaonkar21e73392010-10-21 06:42:55 -050083 if (iov == NULL || signature == NULL || server == NULL)
Steve Frenche9917a02006-03-31 21:22:00 +000084 return -EINVAL;
Steve French84afc292005-12-02 13:32:45 -080085
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -050086 if (!server->secmech.sdescmd5) {
Steve French95dc8dd2013-07-04 10:35:21 -050087 rc = cifs_crypto_shash_md5_allocate(server);
88 if (rc) {
89 cifs_dbg(VFS, "%s: Can't alloc md5 crypto\n", __func__);
90 return -1;
91 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -050092 }
93
94 rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
95 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -050096 cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -050097 return rc;
98 }
99
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500100 rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500101 server->session_key.response, server->session_key.len);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500102 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500103 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500104 return rc;
105 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500106
Steve French50c2f752007-07-13 00:33:32 +0000107 for (i = 0; i < n_vec; i++) {
Jeff Layton745542e2007-11-03 04:34:04 +0000108 if (iov[i].iov_len == 0)
109 continue;
Steve Frenchffdd6e42007-06-24 21:15:44 +0000110 if (iov[i].iov_base == NULL) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500111 cifs_dbg(VFS, "null iovec entry\n");
Steve Frenche9917a02006-03-31 21:22:00 +0000112 return -EIO;
Jeff Layton745542e2007-11-03 04:34:04 +0000113 }
Steve Frenchffdd6e42007-06-24 21:15:44 +0000114 /* The first entry includes a length field (which does not get
Steve Frenche9917a02006-03-31 21:22:00 +0000115 signed that occupies the first 4 bytes before the header */
Steve Frenchffdd6e42007-06-24 21:15:44 +0000116 if (i == 0) {
Steve French63d25832007-11-05 21:46:10 +0000117 if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
Steve Frenche9917a02006-03-31 21:22:00 +0000118 break; /* nothing to sign or corrupt header */
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500119 rc =
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500120 crypto_shash_update(&server->secmech.sdescmd5->shash,
121 iov[i].iov_base + 4, iov[i].iov_len - 4);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500122 } else {
123 rc =
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500124 crypto_shash_update(&server->secmech.sdescmd5->shash,
125 iov[i].iov_base, iov[i].iov_len);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500126 }
127 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500128 cifs_dbg(VFS, "%s: Could not update with payload\n",
129 __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500130 return rc;
131 }
Steve Frenche9917a02006-03-31 21:22:00 +0000132 }
Steve French84afc292005-12-02 13:32:45 -0800133
Jeff Laytonfb308a62012-09-18 16:20:35 -0700134 /* now hash over the rq_pages array */
135 for (i = 0; i < rqst->rq_npages; i++) {
136 struct kvec p_iov;
137
138 cifs_rqst_page_to_kvec(rqst, i, &p_iov);
139 crypto_shash_update(&server->secmech.sdescmd5->shash,
140 p_iov.iov_base, p_iov.iov_len);
141 kunmap(rqst->rq_pages[i]);
142 }
143
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500144 rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500145 if (rc)
Joe Perchesf96637b2013-05-04 22:12:25 -0500146 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
Steve French84afc292005-12-02 13:32:45 -0800147
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500148 return rc;
Steve French84afc292005-12-02 13:32:45 -0800149}
150
Jeff Laytona0f8b4f2011-01-07 11:30:28 -0500151/* must be called with server->srv_mutex held */
Jeff Laytonbf5ea0e2012-09-18 16:20:34 -0700152int cifs_sign_rqst(struct smb_rqst *rqst, 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];
Jeff Laytonbf5ea0e2012-09-18 16:20:34 -0700157 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_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
Jeff Layton998d6fc2011-07-26 12:21:17 -0400162 if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
163 server->tcpStatus == CifsNeedNegotiate)
Steve French84afc292005-12-02 13:32:45 -0800164 return rc;
165
Jeff Layton998d6fc2011-07-26 12:21:17 -0400166 if (!server->session_estab) {
Jeff Laytonb4dacbc2011-10-11 06:41:32 -0400167 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
Jeff Layton998d6fc2011-07-26 12:21:17 -0400168 return rc;
169 }
170
Steve Frenchffdd6e42007-06-24 21:15:44 +0000171 cifs_pdu->Signature.Sequence.SequenceNumber =
Steve French84afc292005-12-02 13:32:45 -0800172 cpu_to_le32(server->sequence_number);
Steve Frenchffdd6e42007-06-24 21:15:44 +0000173 cifs_pdu->Signature.Sequence.Reserved = 0;
Steve French84afc292005-12-02 13:32:45 -0800174
Jeff Layton0124cc42013-04-03 11:55:03 -0400175 *pexpected_response_sequence_number = ++server->sequence_number;
176 ++server->sequence_number;
Steve French84afc292005-12-02 13:32:45 -0800177
Jeff Laytonbf5ea0e2012-09-18 16:20:34 -0700178 rc = cifs_calc_signature(rqst, server, smb_signature);
Steve Frenchffdd6e42007-06-24 21:15:44 +0000179 if (rc)
180 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
181 else
182 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
Steve French84afc292005-12-02 13:32:45 -0800183
Steve Frenchffdd6e42007-06-24 21:15:44 +0000184 return rc;
Steve French84afc292005-12-02 13:32:45 -0800185}
186
Jeff Laytonbf5ea0e2012-09-18 16:20:34 -0700187int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
188 __u32 *pexpected_response_sequence)
189{
190 struct smb_rqst rqst = { .rq_iov = iov,
191 .rq_nvec = n_vec };
192
193 return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
194}
195
Jeff Layton826a95e2011-10-11 06:41:32 -0400196/* must be called with server->srv_mutex held */
197int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
198 __u32 *pexpected_response_sequence_number)
199{
200 struct kvec iov;
201
202 iov.iov_base = cifs_pdu;
203 iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4;
204
Jeff Layton762a4202012-07-23 13:28:38 -0400205 return cifs_sign_smbv(&iov, 1, server,
Jeff Layton826a95e2011-10-11 06:41:32 -0400206 pexpected_response_sequence_number);
207}
208
Jeff Laytonbf5ea0e2012-09-18 16:20:34 -0700209int cifs_verify_signature(struct smb_rqst *rqst,
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500210 struct TCP_Server_Info *server,
Steve Frenchffdd6e42007-06-24 21:15:44 +0000211 __u32 expected_sequence_number)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212{
Steve Frenchc8e56f12010-09-08 21:10:58 +0000213 unsigned int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 char server_response_sig[8];
215 char what_we_think_sig_should_be[20];
Jeff Laytonbf5ea0e2012-09-18 16:20:34 -0700216 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500218 if (cifs_pdu == NULL || server == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 return -EINVAL;
220
Jeff Layton9c4843e2011-06-06 15:40:23 -0400221 if (!server->session_estab)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 return 0;
223
224 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
Steve French50c2f752007-07-13 00:33:32 +0000225 struct smb_com_lock_req *pSMB =
Steve Frenchffdd6e42007-06-24 21:15:44 +0000226 (struct smb_com_lock_req *)cifs_pdu;
227 if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 return 0;
229 }
230
Steve French50c2f752007-07-13 00:33:32 +0000231 /* BB what if signatures are supposed to be on for session but
232 server does not send one? BB */
233
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 /* Do not need to verify session setups with signature "BSRSPYL " */
Steve French50c2f752007-07-13 00:33:32 +0000235 if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
Joe Perchesf96637b2013-05-04 22:12:25 -0500236 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
237 cifs_pdu->Command);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
239 /* save off the origiginal signature so we can modify the smb and check
240 its signature against what the server sent */
Steve French50c2f752007-07-13 00:33:32 +0000241 memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
Steve French50c2f752007-07-13 00:33:32 +0000243 cifs_pdu->Signature.Sequence.SequenceNumber =
244 cpu_to_le32(expected_sequence_number);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 cifs_pdu->Signature.Sequence.Reserved = 0;
246
Jeff Layton157c2492011-04-02 07:34:30 -0400247 mutex_lock(&server->srv_mutex);
Jeff Laytonbf5ea0e2012-09-18 16:20:34 -0700248 rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
Jeff Layton157c2492011-04-02 07:34:30 -0400249 mutex_unlock(&server->srv_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
Steve French50c2f752007-07-13 00:33:32 +0000251 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 return rc;
253
Steve French50c2f752007-07-13 00:33:32 +0000254/* cifs_dump_mem("what we think it should be: ",
255 what_we_think_sig_should_be, 16); */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
Steve French50c2f752007-07-13 00:33:32 +0000257 if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 return -EACCES;
259 else
260 return 0;
261
262}
263
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500264/* first calculate 24 bytes ntlm response and then 16 byte session key */
Shirish Pargaonkar9ef59922011-10-20 13:21:59 -0500265int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266{
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600267 int rc = 0;
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500268 unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
269 char temp_key[CIFS_SESS_KEY_SIZE];
270
271 if (!ses)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 return -EINVAL;
273
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500274 ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
Joe Perchesf96637b2013-05-04 22:12:25 -0500275 if (!ses->auth_key.response)
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500276 return -ENOMEM;
Joe Perchesf96637b2013-05-04 22:12:25 -0500277
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500278 ses->auth_key.len = temp_len;
279
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600280 rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
Shirish Pargaonkar9ef59922011-10-20 13:21:59 -0500281 ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600282 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500283 cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n",
284 __func__, rc);
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600285 return rc;
286 }
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500287
Shirish Pargaonkar9ef59922011-10-20 13:21:59 -0500288 rc = E_md4hash(ses->password, temp_key, nls_cp);
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600289 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500290 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
291 __func__, rc);
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600292 return rc;
293 }
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500294
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600295 rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
296 if (rc)
Joe Perchesf96637b2013-05-04 22:12:25 -0500297 cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n",
298 __func__, rc);
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600299
300 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301}
302
Steve French7c7b25b2006-06-01 19:20:10 +0000303#ifdef CONFIG_CIFS_WEAK_PW_HASH
Steve French43988d72011-04-19 18:23:31 +0000304int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
Jeff Layton4e53a3f2008-12-05 20:41:21 -0500305 char *lnm_session_key)
Steve French7c7b25b2006-06-01 19:20:10 +0000306{
307 int i;
Steve French43988d72011-04-19 18:23:31 +0000308 int rc;
Steve French7c7b25b2006-06-01 19:20:10 +0000309 char password_with_pad[CIFS_ENCPWD_SIZE];
310
311 memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
Jeff Layton4e53a3f2008-12-05 20:41:21 -0500312 if (password)
313 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
Steve French7c7b25b2006-06-01 19:20:10 +0000314
Jeff Layton04912d62010-04-24 07:57:45 -0400315 if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
Jeff Layton4e53a3f2008-12-05 20:41:21 -0500316 memcpy(lnm_session_key, password_with_pad,
317 CIFS_ENCPWD_SIZE);
Steve French43988d72011-04-19 18:23:31 +0000318 return 0;
Jeff Layton4e53a3f2008-12-05 20:41:21 -0500319 }
Steve Frenchbdc4bf6e2006-06-02 22:57:13 +0000320
Steve French7c7b25b2006-06-01 19:20:10 +0000321 /* calculate old style session key */
322 /* calling toupper is less broken than repeatedly
323 calling nls_toupper would be since that will never
324 work for UTF8, but neither handles multibyte code pages
325 but the only alternative would be converting to UCS-16 (Unicode)
326 (using a routine something like UniStrupr) then
327 uppercasing and then converting back from Unicode - which
328 would only worth doing it if we knew it were utf8. Basically
329 utf8 and other multibyte codepages each need their own strupper
330 function since a byte at a time will ont work. */
331
Shirish Pargaonkaref571ca2008-07-24 15:56:05 +0000332 for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
Steve French7c7b25b2006-06-01 19:20:10 +0000333 password_with_pad[i] = toupper(password_with_pad[i]);
Steve French7c7b25b2006-06-01 19:20:10 +0000334
Steve French43988d72011-04-19 18:23:31 +0000335 rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
Jeff Layton4e53a3f2008-12-05 20:41:21 -0500336
Steve French43988d72011-04-19 18:23:31 +0000337 return rc;
Steve French7c7b25b2006-06-01 19:20:10 +0000338}
339#endif /* CIFS_WEAK_PW_HASH */
340
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500341/* Build a proper attribute value/target info pairs blob.
342 * Fill in netbios and dns domain name and workstation name
343 * and client time (total five av pairs and + one end of fields indicator.
344 * Allocate domain name which gets freed when session struct is deallocated.
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500345 */
346static int
Steve French96daf2b2011-05-27 04:34:02 +0000347build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500348{
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500349 unsigned int dlen;
Shirish Pargaonkarcfbd6f82011-08-24 23:05:46 -0500350 unsigned int size = 2 * sizeof(struct ntlmssp2_name);
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500351 char *defdmname = "WORKGROUP";
352 unsigned char *blobptr;
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500353 struct ntlmssp2_name *attrptr;
354
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500355 if (!ses->domainName) {
356 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
357 if (!ses->domainName)
358 return -ENOMEM;
359 }
360
361 dlen = strlen(ses->domainName);
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500362
Shirish Pargaonkarcfbd6f82011-08-24 23:05:46 -0500363 /*
364 * The length of this blob is two times the size of a
365 * structure (av pair) which holds name/size
366 * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
367 * unicode length of a netbios domain name
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500368 */
Shirish Pargaonkarcfbd6f82011-08-24 23:05:46 -0500369 ses->auth_key.len = size + 2 * dlen;
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500370 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
371 if (!ses->auth_key.response) {
372 ses->auth_key.len = 0;
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500373 return -ENOMEM;
374 }
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500375
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500376 blobptr = ses->auth_key.response;
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500377 attrptr = (struct ntlmssp2_name *) blobptr;
378
Shirish Pargaonkarcfbd6f82011-08-24 23:05:46 -0500379 /*
380 * As defined in MS-NTLM 3.3.2, just this av pair field
381 * is sufficient as part of the temp
382 */
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500383 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
384 attrptr->length = cpu_to_le16(2 * dlen);
385 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
Steve Frenchacbbb762012-01-18 22:32:33 -0600386 cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500387
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500388 return 0;
389}
390
391/* Server has provided av pairs/target info in the type 2 challenge
392 * packet and we have plucked it and stored within smb session.
393 * We parse that blob here to find netbios domain name to be used
394 * as part of ntlmv2 authentication (in Target String), if not already
395 * specified on the command line.
396 * If this function returns without any error but without fetching
397 * domain name, authentication may fail against some server but
398 * may not fail against other (those who are not very particular
399 * about target string i.e. for some, just user name might suffice.
400 */
401static int
Steve French96daf2b2011-05-27 04:34:02 +0000402find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500403{
404 unsigned int attrsize;
405 unsigned int type;
406 unsigned int onesize = sizeof(struct ntlmssp2_name);
407 unsigned char *blobptr;
408 unsigned char *blobend;
409 struct ntlmssp2_name *attrptr;
410
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500411 if (!ses->auth_key.len || !ses->auth_key.response)
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500412 return 0;
413
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500414 blobptr = ses->auth_key.response;
415 blobend = blobptr + ses->auth_key.len;
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500416
417 while (blobptr + onesize < blobend) {
418 attrptr = (struct ntlmssp2_name *) blobptr;
419 type = le16_to_cpu(attrptr->type);
420 if (type == NTLMSSP_AV_EOL)
421 break;
422 blobptr += 2; /* advance attr type */
423 attrsize = le16_to_cpu(attrptr->length);
424 blobptr += 2; /* advance attr size */
425 if (blobptr + attrsize > blobend)
426 break;
427 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
Chen Gang057d6332013-07-19 09:01:36 +0800428 if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500429 break;
430 if (!ses->domainName) {
431 ses->domainName =
432 kmalloc(attrsize + 1, GFP_KERNEL);
433 if (!ses->domainName)
434 return -ENOMEM;
Steve Frenchacbbb762012-01-18 22:32:33 -0600435 cifs_from_utf16(ses->domainName,
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500436 (__le16 *)blobptr, attrsize, attrsize,
Steve Frenchb6938552014-09-25 13:20:05 -0500437 nls_cp, NO_MAP_UNI_RSVD);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500438 break;
439 }
440 }
441 blobptr += attrsize; /* advance attr value */
442 }
443
444 return 0;
445}
446
Steve French96daf2b2011-05-27 04:34:02 +0000447static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
Steve French50c2f752007-07-13 00:33:32 +0000448 const struct nls_table *nls_cp)
Steve Frencha8ee0342006-06-05 23:34:19 +0000449{
450 int rc = 0;
451 int len;
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500452 char nt_hash[CIFS_NTHASH_SIZE];
Steve Frenchfdf96a92013-06-25 14:03:16 -0500453 __le16 *user;
Steve French50c2f752007-07-13 00:33:32 +0000454 wchar_t *domain;
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500455 wchar_t *server;
Steve Frenchc8e56f12010-09-08 21:10:58 +0000456
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500457 if (!ses->server->secmech.sdeschmacmd5) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500458 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500459 return -1;
460 }
Steve Frencha8ee0342006-06-05 23:34:19 +0000461
462 /* calculate md4 hash of password */
Shirish Pargaonkar9ef59922011-10-20 13:21:59 -0500463 E_md4hash(ses->password, nt_hash, nls_cp);
Steve Frencha8ee0342006-06-05 23:34:19 +0000464
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500465 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500466 CIFS_NTHASH_SIZE);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500467 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500468 cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500469 return rc;
470 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500471
472 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
473 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500474 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500475 return rc;
476 }
Steve Frencha8ee0342006-06-05 23:34:19 +0000477
Steve Frenchfdf96a92013-06-25 14:03:16 -0500478 /* convert ses->user_name to unicode */
Jeff Layton04febab2012-01-17 16:09:15 -0500479 len = ses->user_name ? strlen(ses->user_name) : 0;
Steve French1717ffc2006-06-08 05:41:32 +0000480 user = kmalloc(2 + (len * 2), GFP_KERNEL);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500481 if (user == NULL) {
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500482 rc = -ENOMEM;
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500483 return rc;
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500484 }
Jeff Layton04febab2012-01-17 16:09:15 -0500485
486 if (len) {
Steve Frenchfdf96a92013-06-25 14:03:16 -0500487 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
Jeff Layton04febab2012-01-17 16:09:15 -0500488 UniStrupr(user);
489 } else {
490 memset(user, '\0', 2);
491 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500492
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500493 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500494 (char *)user, 2 * len);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500495 kfree(user);
496 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500497 cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500498 return rc;
499 }
Steve Frencha8ee0342006-06-05 23:34:19 +0000500
501 /* convert ses->domainName to unicode and uppercase */
Steve French50c2f752007-07-13 00:33:32 +0000502 if (ses->domainName) {
Steve French1717ffc2006-06-08 05:41:32 +0000503 len = strlen(ses->domainName);
Steve Frencha8ee0342006-06-05 23:34:19 +0000504
Steve French50c2f752007-07-13 00:33:32 +0000505 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500506 if (domain == NULL) {
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500507 rc = -ENOMEM;
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500508 return rc;
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500509 }
Steve Frenchacbbb762012-01-18 22:32:33 -0600510 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
511 nls_cp);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500512 rc =
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500513 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
514 (char *)domain, 2 * len);
Steve French1717ffc2006-06-08 05:41:32 +0000515 kfree(domain);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500516 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500517 cifs_dbg(VFS, "%s: Could not update with domain\n",
518 __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500519 return rc;
520 }
Steve French8b7a4542015-03-30 16:58:17 -0500521 } else {
522 /* We use ses->serverName if no domain name available */
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500523 len = strlen(ses->serverName);
524
525 server = kmalloc(2 + (len * 2), GFP_KERNEL);
526 if (server == NULL) {
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500527 rc = -ENOMEM;
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500528 return rc;
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500529 }
Steve Frenchacbbb762012-01-18 22:32:33 -0600530 len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len,
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500531 nls_cp);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500532 rc =
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500533 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
534 (char *)server, 2 * len);
535 kfree(server);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500536 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500537 cifs_dbg(VFS, "%s: Could not update with server\n",
538 __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500539 return rc;
540 }
Steve French1717ffc2006-06-08 05:41:32 +0000541 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500542
543 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500544 ntlmv2_hash);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500545 if (rc)
Joe Perchesf96637b2013-05-04 22:12:25 -0500546 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500547
Steve Frencha8ee0342006-06-05 23:34:19 +0000548 return rc;
549}
550
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500551static int
Steve French96daf2b2011-05-27 04:34:02 +0000552CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500553{
554 int rc;
Tim Gardner2c957dd2013-11-07 16:40:57 -0700555 struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
556 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
557 unsigned int hash_len;
558
559 /* The MD5 hash starts at challenge_key.key */
560 hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
561 offsetof(struct ntlmv2_resp, challenge.key[0]));
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500562
563 if (!ses->server->secmech.sdeschmacmd5) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500564 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500565 return -1;
566 }
567
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500568 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
Tim Gardner2c957dd2013-11-07 16:40:57 -0700569 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500570 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500571 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
572 __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500573 return rc;
574 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500575
576 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
577 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500578 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500579 return rc;
580 }
581
Jeff Layton3f618222013-06-12 19:52:14 -0500582 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
Tim Gardner2c957dd2013-11-07 16:40:57 -0700583 memcpy(ntlmv2->challenge.key,
584 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
Shirish Pargaonkard3ba50b2010-10-27 15:20:36 -0500585 else
Tim Gardner2c957dd2013-11-07 16:40:57 -0700586 memcpy(ntlmv2->challenge.key,
587 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500588 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
Tim Gardner2c957dd2013-11-07 16:40:57 -0700589 ntlmv2->challenge.key, hash_len);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500590 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500591 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500592 return rc;
593 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500594
Tim Gardner2c957dd2013-11-07 16:40:57 -0700595 /* Note that the MD5 digest over writes anon.challenge_key.key */
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500596 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
Tim Gardner2c957dd2013-11-07 16:40:57 -0700597 ntlmv2->ntlmv2_hash);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500598 if (rc)
Joe Perchesf96637b2013-05-04 22:12:25 -0500599 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500600
601 return rc;
602}
603
Steve French95dc8dd2013-07-04 10:35:21 -0500604static int crypto_hmacmd5_alloc(struct TCP_Server_Info *server)
605{
Jeff Laytonba482022013-07-31 13:48:00 -0400606 int rc;
Steve French95dc8dd2013-07-04 10:35:21 -0500607 unsigned int size;
608
609 /* check if already allocated */
610 if (server->secmech.sdeschmacmd5)
611 return 0;
612
613 server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
614 if (IS_ERR(server->secmech.hmacmd5)) {
615 cifs_dbg(VFS, "could not allocate crypto hmacmd5\n");
Jeff Laytonba482022013-07-31 13:48:00 -0400616 rc = PTR_ERR(server->secmech.hmacmd5);
617 server->secmech.hmacmd5 = NULL;
618 return rc;
Steve French95dc8dd2013-07-04 10:35:21 -0500619 }
620
621 size = sizeof(struct shash_desc) +
622 crypto_shash_descsize(server->secmech.hmacmd5);
623 server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
624 if (!server->secmech.sdeschmacmd5) {
625 crypto_free_shash(server->secmech.hmacmd5);
626 server->secmech.hmacmd5 = NULL;
627 return -ENOMEM;
628 }
629 server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
630 server->secmech.sdeschmacmd5->shash.flags = 0x0;
631
632 return 0;
633}
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500634
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500635int
Steve French96daf2b2011-05-27 04:34:02 +0000636setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
Steve French9fbc5902010-08-20 20:42:26 +0000637{
Steve Frenchc8e56f12010-09-08 21:10:58 +0000638 int rc;
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500639 int baselen;
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500640 unsigned int tilen;
Tim Gardner2c957dd2013-11-07 16:40:57 -0700641 struct ntlmv2_resp *ntlmv2;
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500642 char ntlmv2_hash[16];
643 unsigned char *tiblob = NULL; /* target info blob */
Steve French6d027cf2006-06-05 16:26:05 +0000644
Jeff Layton3f618222013-06-12 19:52:14 -0500645 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500646 if (!ses->domainName) {
Shirish Pargaonkarf7c54452010-10-26 18:10:24 -0500647 rc = find_domain_name(ses, nls_cp);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500648 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500649 cifs_dbg(VFS, "error %d finding domain name\n",
650 rc);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500651 goto setup_ntlmv2_rsp_ret;
652 }
653 }
654 } else {
Shirish Pargaonkar9daa42e2010-10-10 13:21:05 -0500655 rc = build_avpair_blob(ses, nls_cp);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500656 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500657 cifs_dbg(VFS, "error %d building av pair blob\n", rc);
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500658 goto setup_ntlmv2_rsp_ret;
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500659 }
660 }
Steve Frencha8ee0342006-06-05 23:34:19 +0000661
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500662 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500663 tilen = ses->auth_key.len;
664 tiblob = ses->auth_key.response;
665
666 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500667 if (!ses->auth_key.response) {
668 rc = ENOMEM;
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500669 ses->auth_key.len = 0;
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500670 goto setup_ntlmv2_rsp_ret;
671 }
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500672 ses->auth_key.len += baselen;
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500673
Tim Gardner2c957dd2013-11-07 16:40:57 -0700674 ntlmv2 = (struct ntlmv2_resp *)
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500675 (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
Tim Gardner2c957dd2013-11-07 16:40:57 -0700676 ntlmv2->blob_signature = cpu_to_le32(0x00000101);
677 ntlmv2->reserved = 0;
678 /* Must be within 5 minutes of the server */
679 ntlmv2->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
680 get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
681 ntlmv2->reserved2 = 0;
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500682
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500683 memcpy(ses->auth_key.response + baselen, tiblob, tilen);
Shirish Pargaonkar21e73392010-10-21 06:42:55 -0500684
Steve French95dc8dd2013-07-04 10:35:21 -0500685 rc = crypto_hmacmd5_alloc(ses->server);
686 if (rc) {
687 cifs_dbg(VFS, "could not crypto alloc hmacmd5 rc %d\n", rc);
688 goto setup_ntlmv2_rsp_ret;
689 }
690
Shirish Pargaonkarf7c54452010-10-26 18:10:24 -0500691 /* calculate ntlmv2_hash */
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500692 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500693 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500694 cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500695 goto setup_ntlmv2_rsp_ret;
696 }
Shirish Pargaonkarf7c54452010-10-26 18:10:24 -0500697
698 /* calculate first part of the client response (CR1) */
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500699 rc = CalcNTLMv2_response(ses, ntlmv2_hash);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500700 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500701 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500702 goto setup_ntlmv2_rsp_ret;
703 }
Steve Frenchb609f062007-07-09 07:55:14 +0000704
Shirish Pargaonkar5d0d2882010-10-13 18:15:00 -0500705 /* now calculate the session key for NTLMv2 */
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500706 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500707 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500708 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500709 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
710 __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500711 goto setup_ntlmv2_rsp_ret;
712 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500713
714 rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
715 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500716 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500717 goto setup_ntlmv2_rsp_ret;
718 }
719
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500720 rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
Tim Gardner2c957dd2013-11-07 16:40:57 -0700721 ntlmv2->ntlmv2_hash,
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500722 CIFS_HMAC_MD5_HASH_SIZE);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500723 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500724 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500725 goto setup_ntlmv2_rsp_ret;
726 }
Shirish Pargaonkar307fbd32010-10-21 14:25:17 -0500727
728 rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
729 ses->auth_key.response);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500730 if (rc)
Joe Perchesf96637b2013-05-04 22:12:25 -0500731 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500732
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500733setup_ntlmv2_rsp_ret:
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500734 kfree(tiblob);
Shirish Pargaonkar2b149f12010-09-18 22:02:18 -0500735
736 return rc;
Steve French6d027cf2006-06-05 16:26:05 +0000737}
738
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500739int
Steve French96daf2b2011-05-27 04:34:02 +0000740calc_seckey(struct cifs_ses *ses)
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500741{
742 int rc;
743 struct crypto_blkcipher *tfm_arc4;
744 struct scatterlist sgin, sgout;
745 struct blkcipher_desc desc;
746 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
747
748 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
749
750 tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
Shirish Pargaonkar7a8587e2011-01-29 13:54:58 -0600751 if (IS_ERR(tfm_arc4)) {
752 rc = PTR_ERR(tfm_arc4);
Joe Perchesf96637b2013-05-04 22:12:25 -0500753 cifs_dbg(VFS, "could not allocate crypto API arc4\n");
Shirish Pargaonkar7a8587e2011-01-29 13:54:58 -0600754 return rc;
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500755 }
756
757 desc.tfm = tfm_arc4;
758
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500759 rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500760 CIFS_SESS_KEY_SIZE);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500761 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500762 cifs_dbg(VFS, "%s: Could not set response as a key\n",
763 __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500764 return rc;
765 }
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500766
767 sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
Shirish Pargaonkard3686d52010-10-28 09:53:07 -0500768 sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500769
770 rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
771 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500772 cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc);
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500773 crypto_free_blkcipher(tfm_arc4);
774 return rc;
775 }
776
777 /* make secondary_key/nonce as session key */
778 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
779 /* and make len as that of session key only */
780 ses->auth_key.len = CIFS_SESS_KEY_SIZE;
781
782 crypto_free_blkcipher(tfm_arc4);
783
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500784 return rc;
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500785}
786
787void
788cifs_crypto_shash_release(struct TCP_Server_Info *server)
789{
Steve French95dc8dd2013-07-04 10:35:21 -0500790 if (server->secmech.cmacaes) {
Steve French429b46f2013-06-26 23:45:05 -0500791 crypto_free_shash(server->secmech.cmacaes);
Steve French95dc8dd2013-07-04 10:35:21 -0500792 server->secmech.cmacaes = NULL;
793 }
Steve French429b46f2013-06-26 23:45:05 -0500794
Steve French95dc8dd2013-07-04 10:35:21 -0500795 if (server->secmech.hmacsha256) {
Pavel Shilovsky3c1bf7e2012-09-18 16:20:30 -0700796 crypto_free_shash(server->secmech.hmacsha256);
Steve French95dc8dd2013-07-04 10:35:21 -0500797 server->secmech.hmacsha256 = NULL;
798 }
Pavel Shilovsky3c1bf7e2012-09-18 16:20:30 -0700799
Steve French95dc8dd2013-07-04 10:35:21 -0500800 if (server->secmech.md5) {
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500801 crypto_free_shash(server->secmech.md5);
Steve French95dc8dd2013-07-04 10:35:21 -0500802 server->secmech.md5 = NULL;
803 }
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500804
Steve French95dc8dd2013-07-04 10:35:21 -0500805 if (server->secmech.hmacmd5) {
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500806 crypto_free_shash(server->secmech.hmacmd5);
Steve French95dc8dd2013-07-04 10:35:21 -0500807 server->secmech.hmacmd5 = NULL;
808 }
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500809
Steve French429b46f2013-06-26 23:45:05 -0500810 kfree(server->secmech.sdesccmacaes);
Steve French95dc8dd2013-07-04 10:35:21 -0500811 server->secmech.sdesccmacaes = NULL;
Pavel Shilovsky3c1bf7e2012-09-18 16:20:30 -0700812 kfree(server->secmech.sdeschmacsha256);
Steve French95dc8dd2013-07-04 10:35:21 -0500813 server->secmech.sdeschmacsha256 = NULL;
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500814 kfree(server->secmech.sdeschmacmd5);
Steve French95dc8dd2013-07-04 10:35:21 -0500815 server->secmech.sdeschmacmd5 = NULL;
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500816 kfree(server->secmech.sdescmd5);
Steve French95dc8dd2013-07-04 10:35:21 -0500817 server->secmech.sdescmd5 = NULL;
Shirish Pargaonkard2b91522010-10-21 14:25:08 -0500818}