blob: 43eb1367b10353ae1e71a5196b83587df6939160 [file] [log] [blame]
Steve French790fe572007-07-07 19:25:05 +00001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 Unix SMB/Netbios implementation.
3 Version 1.9.
4 SMB parameters and setup
5 Copyright (C) Andrew Tridgell 1992-2000
6 Copyright (C) Luke Kenneth Casson Leighton 1996-2000
7 Modified by Jeremy Allison 1995.
8 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
9 Modified by Steve French (sfrench@us.ibm.com) 2002-2003
Steve French50c2f752007-07-13 00:33:32 +000010
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2 of the License, or
14 (at your option) any later version.
Steve French50c2f752007-07-13 00:33:32 +000015
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
Steve French50c2f752007-07-13 00:33:32 +000020
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software
23 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24*/
25
26#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090027#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/fs.h>
29#include <linux/string.h>
30#include <linux/kernel.h>
31#include <linux/random.h>
32#include "cifs_unicode.h"
33#include "cifspdu.h"
Steve French39798772006-05-31 22:40:51 +000034#include "cifsglob.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include "cifs_debug.h"
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -060036#include "cifsproto.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
Steve French4b18f2a2008-04-29 00:06:05 +000038#ifndef false
39#define false 0
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#endif
Steve French4b18f2a2008-04-29 00:06:05 +000041#ifndef true
42#define true 1
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#endif
44
45/* following came from the other byteorder.h to avoid include conflicts */
46#define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
47#define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
48#define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
49
Steve French43988d72011-04-19 18:23:31 +000050static void
51str_to_key(unsigned char *str, unsigned char *key)
52{
53 int i;
54
55 key[0] = str[0] >> 1;
56 key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2);
57 key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3);
58 key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4);
59 key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5);
60 key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6);
61 key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7);
62 key[7] = str[6] & 0x7F;
63 for (i = 0; i < 8; i++)
64 key[i] = (key[i] << 1);
65}
66
67static int
68smbhash(unsigned char *out, const unsigned char *in, unsigned char *key)
69{
70 int rc;
71 unsigned char key2[8];
72 struct crypto_blkcipher *tfm_des;
73 struct scatterlist sgin, sgout;
74 struct blkcipher_desc desc;
75
76 str_to_key(key, key2);
77
78 tfm_des = crypto_alloc_blkcipher("ecb(des)", 0, CRYPTO_ALG_ASYNC);
79 if (IS_ERR(tfm_des)) {
80 rc = PTR_ERR(tfm_des);
Joe Perchesf96637b2013-05-04 22:12:25 -050081 cifs_dbg(VFS, "could not allocate des crypto API\n");
Steve French43988d72011-04-19 18:23:31 +000082 goto smbhash_err;
83 }
84
85 desc.tfm = tfm_des;
86
87 crypto_blkcipher_setkey(tfm_des, key2, 8);
88
89 sg_init_one(&sgin, in, 8);
90 sg_init_one(&sgout, out, 8);
91
92 rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, 8);
Jeff Laytone4fb0ed2011-06-20 14:33:16 -040093 if (rc)
Joe Perchesf96637b2013-05-04 22:12:25 -050094 cifs_dbg(VFS, "could not encrypt crypt key rc: %d\n", rc);
Steve French43988d72011-04-19 18:23:31 +000095
Jeff Laytone4fb0ed2011-06-20 14:33:16 -040096 crypto_free_blkcipher(tfm_des);
Steve French43988d72011-04-19 18:23:31 +000097smbhash_err:
98 return rc;
99}
100
101static int
102E_P16(unsigned char *p14, unsigned char *p16)
103{
104 int rc;
105 unsigned char sp8[8] =
106 { 0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25 };
107
108 rc = smbhash(p16, sp8, p14);
109 if (rc)
110 return rc;
111 rc = smbhash(p16 + 8, sp8, p14 + 7);
112 return rc;
113}
114
115static int
116E_P24(unsigned char *p21, const unsigned char *c8, unsigned char *p24)
117{
118 int rc;
119
120 rc = smbhash(p24, c8, p21);
121 if (rc)
122 return rc;
123 rc = smbhash(p24 + 8, c8, p21 + 7);
124 if (rc)
125 return rc;
126 rc = smbhash(p24 + 16, c8, p21 + 14);
127 return rc;
128}
129
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600130/* produce a md4 message digest from data of length n bytes */
131int
132mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len)
133{
134 int rc;
135 unsigned int size;
136 struct crypto_shash *md4;
137 struct sdesc *sdescmd4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600139 md4 = crypto_alloc_shash("md4", 0, 0);
140 if (IS_ERR(md4)) {
Jeff Laytonffeb4142011-01-29 07:03:02 -0500141 rc = PTR_ERR(md4);
Joe Perchesf96637b2013-05-04 22:12:25 -0500142 cifs_dbg(VFS, "%s: Crypto md4 allocation error %d\n",
143 __func__, rc);
Jeff Laytonffeb4142011-01-29 07:03:02 -0500144 return rc;
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600145 }
146 size = sizeof(struct shash_desc) + crypto_shash_descsize(md4);
147 sdescmd4 = kmalloc(size, GFP_KERNEL);
148 if (!sdescmd4) {
149 rc = -ENOMEM;
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600150 goto mdfour_err;
151 }
152 sdescmd4->shash.tfm = md4;
153 sdescmd4->shash.flags = 0x0;
154
155 rc = crypto_shash_init(&sdescmd4->shash);
156 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500157 cifs_dbg(VFS, "%s: Could not init md4 shash\n", __func__);
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600158 goto mdfour_err;
159 }
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500160 rc = crypto_shash_update(&sdescmd4->shash, link_str, link_len);
161 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500162 cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500163 goto mdfour_err;
164 }
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600165 rc = crypto_shash_final(&sdescmd4->shash, md4_hash);
Shirish Pargaonkar14cae322011-06-20 16:14:03 -0500166 if (rc)
Joe Perchesf96637b2013-05-04 22:12:25 -0500167 cifs_dbg(VFS, "%s: Could not generate md4 hash\n", __func__);
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600168
169mdfour_err:
170 crypto_free_shash(md4);
171 kfree(sdescmd4);
172
173 return rc;
174}
175
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176/*
177 This implements the X/Open SMB password encryption
Steve French790fe572007-07-07 19:25:05 +0000178 It takes a password, a 8 byte "crypt key" and puts 24 bytes of
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 encrypted password into p24 */
180/* Note that password must be uppercased and null terminated */
Steve French43988d72011-04-19 18:23:31 +0000181int
Jeff Layton4e53a3f2008-12-05 20:41:21 -0500182SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183{
Steve French43988d72011-04-19 18:23:31 +0000184 int rc;
185 unsigned char p14[14], p16[16], p21[21];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 memset(p14, '\0', 14);
Steve French43988d72011-04-19 18:23:31 +0000188 memset(p16, '\0', 16);
189 memset(p21, '\0', 21);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
Steve French43988d72011-04-19 18:23:31 +0000191 memcpy(p14, passwd, 14);
192 rc = E_P16(p14, p16);
193 if (rc)
194 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
Steve French43988d72011-04-19 18:23:31 +0000196 memcpy(p21, p16, 16);
197 rc = E_P24(p21, c8, p24);
Steve French50c2f752007-07-13 00:33:32 +0000198
Steve French43988d72011-04-19 18:23:31 +0000199 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200}
201
Steve French790fe572007-07-07 19:25:05 +0000202/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 * Creates the MD4 Hash of the users password in NT UNICODE.
204 */
205
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600206int
Shirish Pargaonkar9ef59922011-10-20 13:21:59 -0500207E_md4hash(const unsigned char *passwd, unsigned char *p16,
208 const struct nls_table *codepage)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209{
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600210 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 int len;
Steve French9c32c632011-11-10 12:48:20 -0600212 __le16 wpwd[129];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
214 /* Password cannot be longer than 128 characters */
Shirish Pargaonkar9ef59922011-10-20 13:21:59 -0500215 if (passwd) /* Password must be converted to NT unicode */
Steve Frenchacbbb762012-01-18 22:32:33 -0600216 len = cifs_strtoUTF16(wpwd, passwd, 128, codepage);
Shirish Pargaonkar9ef59922011-10-20 13:21:59 -0500217 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 len = 0;
Shirish Pargaonkar9ef59922011-10-20 13:21:59 -0500219 *wpwd = 0; /* Ensure string is null terminated */
220 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Steve French9c32c632011-11-10 12:48:20 -0600222 rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16));
223 memset(wpwd, 0, 129 * sizeof(__le16));
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600224
225 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226}
227
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228/* Does the NT MD4 hash then des encryption. */
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600229int
Shirish Pargaonkar9ef59922011-10-20 13:21:59 -0500230SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24,
231 const struct nls_table *codepage)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232{
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600233 int rc;
Steve French43988d72011-04-19 18:23:31 +0000234 unsigned char p16[16], p21[21];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
Steve French43988d72011-04-19 18:23:31 +0000236 memset(p16, '\0', 16);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 memset(p21, '\0', 21);
238
Shirish Pargaonkar9ef59922011-10-20 13:21:59 -0500239 rc = E_md4hash(passwd, p16, codepage);
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600240 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500241 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
242 __func__, rc);
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600243 return rc;
244 }
Steve French43988d72011-04-19 18:23:31 +0000245 memcpy(p21, p16, 16);
246 rc = E_P24(p21, c8, p24);
Shirish Pargaonkaree2c9252011-01-27 09:58:04 -0600247 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248}