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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 Unix SMB/Netbios implementation.
4 Version 1.9.
5 SMB parameters and setup
6 Copyright (C) Andrew Tridgell 1992-2000
7 Copyright (C) Luke Kenneth Casson Leighton 1996-2000
8 Modified by Jeremy Allison 1995.
9 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
10 Modified by Steve French (sfrench@us.ibm.com) 2002-2003
11
12*/
13
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/fips.h>
17#include <linux/fs.h>
18#include <linux/string.h>
19#include <linux/kernel.h>
20#include <linux/random.h>
21#include "cifs_fs_sb.h"
22#include "cifs_unicode.h"
23#include "cifspdu.h"
24#include "cifsglob.h"
25#include "cifs_debug.h"
26#include "cifsproto.h"
27#include "../smbfs_common/md4.h"
28
29#ifndef false
30#define false 0
31#endif
32#ifndef true
33#define true 1
34#endif
35
36/* following came from the other byteorder.h to avoid include conflicts */
37#define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
38#define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
39#define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
40
41/* produce a md4 message digest from data of length n bytes */
42static int
43mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len)
44{
45 int rc;
46 struct md4_ctx mctx;
47
48 rc = cifs_md4_init(&mctx);
49 if (rc) {
50 cifs_dbg(VFS, "%s: Could not init MD4\n", __func__);
51 goto mdfour_err;
52 }
53 rc = cifs_md4_update(&mctx, link_str, link_len);
54 if (rc) {
55 cifs_dbg(VFS, "%s: Could not update MD4\n", __func__);
56 goto mdfour_err;
57 }
58 rc = cifs_md4_final(&mctx, md4_hash);
59 if (rc)
60 cifs_dbg(VFS, "%s: Could not finalize MD4\n", __func__);
61
62
63mdfour_err:
64 return rc;
65}
66
67/*
68 * Creates the MD4 Hash of the users password in NT UNICODE.
69 */
70
71int
72E_md4hash(const unsigned char *passwd, unsigned char *p16,
73 const struct nls_table *codepage)
74{
75 int rc;
76 int len;
77 __le16 wpwd[129];
78
79 /* Password cannot be longer than 128 characters */
80 if (passwd) /* Password must be converted to NT unicode */
81 len = cifs_strtoUTF16(wpwd, passwd, 128, codepage);
82 else {
83 len = 0;
84 *wpwd = 0; /* Ensure string is null terminated */
85 }
86
87 rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16));
88 memzero_explicit(wpwd, sizeof(wpwd));
89
90 return rc;
91}
1/*
2 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
10
11 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.
15
16 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.
20
21 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>
27#include <linux/slab.h>
28#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"
34#include "cifsglob.h"
35#include "cifs_debug.h"
36#include "cifsproto.h"
37
38#ifndef false
39#define false 0
40#endif
41#ifndef true
42#define true 1
43#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
50static 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);
81 cERROR(1, "could not allocate des crypto API\n");
82 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);
93 if (rc)
94 cERROR(1, "could not encrypt crypt key rc: %d\n", rc);
95
96 crypto_free_blkcipher(tfm_des);
97smbhash_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
130/* 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;
138
139 md4 = crypto_alloc_shash("md4", 0, 0);
140 if (IS_ERR(md4)) {
141 rc = PTR_ERR(md4);
142 cERROR(1, "%s: Crypto md4 allocation error %d\n", __func__, rc);
143 return rc;
144 }
145 size = sizeof(struct shash_desc) + crypto_shash_descsize(md4);
146 sdescmd4 = kmalloc(size, GFP_KERNEL);
147 if (!sdescmd4) {
148 rc = -ENOMEM;
149 cERROR(1, "%s: Memory allocation failure\n", __func__);
150 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) {
157 cERROR(1, "%s: Could not init md4 shash\n", __func__);
158 goto mdfour_err;
159 }
160 rc = crypto_shash_update(&sdescmd4->shash, link_str, link_len);
161 if (rc) {
162 cERROR(1, "%s: Could not update with link_str\n", __func__);
163 goto mdfour_err;
164 }
165 rc = crypto_shash_final(&sdescmd4->shash, md4_hash);
166 if (rc)
167 cERROR(1, "%s: Could not genereate md4 hash\n", __func__);
168
169mdfour_err:
170 crypto_free_shash(md4);
171 kfree(sdescmd4);
172
173 return rc;
174}
175
176/*
177 This implements the X/Open SMB password encryption
178 It takes a password, a 8 byte "crypt key" and puts 24 bytes of
179 encrypted password into p24 */
180/* Note that password must be uppercased and null terminated */
181int
182SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24)
183{
184 int rc;
185 unsigned char p14[14], p16[16], p21[21];
186
187 memset(p14, '\0', 14);
188 memset(p16, '\0', 16);
189 memset(p21, '\0', 21);
190
191 memcpy(p14, passwd, 14);
192 rc = E_P16(p14, p16);
193 if (rc)
194 return rc;
195
196 memcpy(p21, p16, 16);
197 rc = E_P24(p21, c8, p24);
198
199 return rc;
200}
201
202/*
203 * Creates the MD4 Hash of the users password in NT UNICODE.
204 */
205
206int
207E_md4hash(const unsigned char *passwd, unsigned char *p16,
208 const struct nls_table *codepage)
209{
210 int rc;
211 int len;
212 __le16 wpwd[129];
213
214 /* Password cannot be longer than 128 characters */
215 if (passwd) /* Password must be converted to NT unicode */
216 len = cifs_strtoUTF16(wpwd, passwd, 128, codepage);
217 else {
218 len = 0;
219 *wpwd = 0; /* Ensure string is null terminated */
220 }
221
222 rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16));
223 memset(wpwd, 0, 129 * sizeof(__le16));
224
225 return rc;
226}
227
228/* Does the NT MD4 hash then des encryption. */
229int
230SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24,
231 const struct nls_table *codepage)
232{
233 int rc;
234 unsigned char p16[16], p21[21];
235
236 memset(p16, '\0', 16);
237 memset(p21, '\0', 21);
238
239 rc = E_md4hash(passwd, p16, codepage);
240 if (rc) {
241 cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc);
242 return rc;
243 }
244 memcpy(p21, p16, 16);
245 rc = E_P24(p21, c8, p24);
246 return rc;
247}