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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/crypto.h>
27#include <linux/module.h>
28#include <linux/slab.h>
29#include <linux/fs.h>
30#include <linux/string.h>
31#include <linux/kernel.h>
32#include <linux/random.h>
33#include "cifs_fs_sb.h"
34#include "cifs_unicode.h"
35#include "cifspdu.h"
36#include "cifsglob.h"
37#include "cifs_debug.h"
38#include "cifsproto.h"
39
40#ifndef false
41#define false 0
42#endif
43#ifndef true
44#define true 1
45#endif
46
47/* following came from the other byteorder.h to avoid include conflicts */
48#define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
49#define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
50#define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
51
52static void
53str_to_key(unsigned char *str, unsigned char *key)
54{
55 int i;
56
57 key[0] = str[0] >> 1;
58 key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2);
59 key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3);
60 key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4);
61 key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5);
62 key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6);
63 key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7);
64 key[7] = str[6] & 0x7F;
65 for (i = 0; i < 8; i++)
66 key[i] = (key[i] << 1);
67}
68
69static int
70smbhash(unsigned char *out, const unsigned char *in, unsigned char *key)
71{
72 unsigned char key2[8];
73 struct crypto_cipher *tfm_des;
74
75 str_to_key(key, key2);
76
77 tfm_des = crypto_alloc_cipher("des", 0, 0);
78 if (IS_ERR(tfm_des)) {
79 cifs_dbg(VFS, "could not allocate des crypto API\n");
80 return PTR_ERR(tfm_des);
81 }
82
83 crypto_cipher_setkey(tfm_des, key2, 8);
84 crypto_cipher_encrypt_one(tfm_des, out, in);
85 crypto_free_cipher(tfm_des);
86
87 return 0;
88}
89
90static int
91E_P16(unsigned char *p14, unsigned char *p16)
92{
93 int rc;
94 unsigned char sp8[8] =
95 { 0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25 };
96
97 rc = smbhash(p16, sp8, p14);
98 if (rc)
99 return rc;
100 rc = smbhash(p16 + 8, sp8, p14 + 7);
101 return rc;
102}
103
104static int
105E_P24(unsigned char *p21, const unsigned char *c8, unsigned char *p24)
106{
107 int rc;
108
109 rc = smbhash(p24, c8, p21);
110 if (rc)
111 return rc;
112 rc = smbhash(p24 + 8, c8, p21 + 7);
113 if (rc)
114 return rc;
115 rc = smbhash(p24 + 16, c8, p21 + 14);
116 return rc;
117}
118
119/* produce a md4 message digest from data of length n bytes */
120int
121mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len)
122{
123 int rc;
124 struct crypto_shash *md4 = NULL;
125 struct sdesc *sdescmd4 = NULL;
126
127 rc = cifs_alloc_hash("md4", &md4, &sdescmd4);
128 if (rc)
129 goto mdfour_err;
130
131 rc = crypto_shash_init(&sdescmd4->shash);
132 if (rc) {
133 cifs_dbg(VFS, "%s: Could not init md4 shash\n", __func__);
134 goto mdfour_err;
135 }
136 rc = crypto_shash_update(&sdescmd4->shash, link_str, link_len);
137 if (rc) {
138 cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__);
139 goto mdfour_err;
140 }
141 rc = crypto_shash_final(&sdescmd4->shash, md4_hash);
142 if (rc)
143 cifs_dbg(VFS, "%s: Could not generate md4 hash\n", __func__);
144
145mdfour_err:
146 cifs_free_hash(&md4, &sdescmd4);
147 return rc;
148}
149
150/*
151 This implements the X/Open SMB password encryption
152 It takes a password, a 8 byte "crypt key" and puts 24 bytes of
153 encrypted password into p24 */
154/* Note that password must be uppercased and null terminated */
155int
156SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24)
157{
158 int rc;
159 unsigned char p14[14], p16[16], p21[21];
160
161 memset(p14, '\0', 14);
162 memset(p16, '\0', 16);
163 memset(p21, '\0', 21);
164
165 memcpy(p14, passwd, 14);
166 rc = E_P16(p14, p16);
167 if (rc)
168 return rc;
169
170 memcpy(p21, p16, 16);
171 rc = E_P24(p21, c8, p24);
172
173 return rc;
174}
175
176/*
177 * Creates the MD4 Hash of the users password in NT UNICODE.
178 */
179
180int
181E_md4hash(const unsigned char *passwd, unsigned char *p16,
182 const struct nls_table *codepage)
183{
184 int rc;
185 int len;
186 __le16 wpwd[129];
187
188 /* Password cannot be longer than 128 characters */
189 if (passwd) /* Password must be converted to NT unicode */
190 len = cifs_strtoUTF16(wpwd, passwd, 128, codepage);
191 else {
192 len = 0;
193 *wpwd = 0; /* Ensure string is null terminated */
194 }
195
196 rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16));
197 memzero_explicit(wpwd, sizeof(wpwd));
198
199 return rc;
200}
201
202/* Does the NT MD4 hash then des encryption. */
203int
204SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24,
205 const struct nls_table *codepage)
206{
207 int rc;
208 unsigned char p16[16], p21[21];
209
210 memset(p16, '\0', 16);
211 memset(p21, '\0', 21);
212
213 rc = E_md4hash(passwd, p16, codepage);
214 if (rc) {
215 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
216 __func__, rc);
217 return rc;
218 }
219 memcpy(p21, p16, 16);
220 rc = E_P24(p21, c8, p24);
221 return rc;
222}
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 <crypto/des.h>
22#include "cifs_fs_sb.h"
23#include "cifs_unicode.h"
24#include "cifspdu.h"
25#include "cifsglob.h"
26#include "cifs_debug.h"
27#include "cifsproto.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
41static void
42str_to_key(unsigned char *str, unsigned char *key)
43{
44 int i;
45
46 key[0] = str[0] >> 1;
47 key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2);
48 key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3);
49 key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4);
50 key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5);
51 key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6);
52 key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7);
53 key[7] = str[6] & 0x7F;
54 for (i = 0; i < 8; i++)
55 key[i] = (key[i] << 1);
56}
57
58static int
59smbhash(unsigned char *out, const unsigned char *in, unsigned char *key)
60{
61 unsigned char key2[8];
62 struct des_ctx ctx;
63
64 str_to_key(key, key2);
65
66 if (fips_enabled) {
67 cifs_dbg(VFS, "FIPS compliance enabled: DES not permitted\n");
68 return -ENOENT;
69 }
70
71 des_expand_key(&ctx, key2, DES_KEY_SIZE);
72 des_encrypt(&ctx, out, in);
73 memzero_explicit(&ctx, sizeof(ctx));
74
75 return 0;
76}
77
78static int
79E_P16(unsigned char *p14, unsigned char *p16)
80{
81 int rc;
82 unsigned char sp8[8] =
83 { 0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25 };
84
85 rc = smbhash(p16, sp8, p14);
86 if (rc)
87 return rc;
88 rc = smbhash(p16 + 8, sp8, p14 + 7);
89 return rc;
90}
91
92static int
93E_P24(unsigned char *p21, const unsigned char *c8, unsigned char *p24)
94{
95 int rc;
96
97 rc = smbhash(p24, c8, p21);
98 if (rc)
99 return rc;
100 rc = smbhash(p24 + 8, c8, p21 + 7);
101 if (rc)
102 return rc;
103 rc = smbhash(p24 + 16, c8, p21 + 14);
104 return rc;
105}
106
107/* produce a md4 message digest from data of length n bytes */
108int
109mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len)
110{
111 int rc;
112 struct crypto_shash *md4 = NULL;
113 struct sdesc *sdescmd4 = NULL;
114
115 rc = cifs_alloc_hash("md4", &md4, &sdescmd4);
116 if (rc)
117 goto mdfour_err;
118
119 rc = crypto_shash_init(&sdescmd4->shash);
120 if (rc) {
121 cifs_dbg(VFS, "%s: Could not init md4 shash\n", __func__);
122 goto mdfour_err;
123 }
124 rc = crypto_shash_update(&sdescmd4->shash, link_str, link_len);
125 if (rc) {
126 cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__);
127 goto mdfour_err;
128 }
129 rc = crypto_shash_final(&sdescmd4->shash, md4_hash);
130 if (rc)
131 cifs_dbg(VFS, "%s: Could not generate md4 hash\n", __func__);
132
133mdfour_err:
134 cifs_free_hash(&md4, &sdescmd4);
135 return rc;
136}
137
138/*
139 This implements the X/Open SMB password encryption
140 It takes a password, a 8 byte "crypt key" and puts 24 bytes of
141 encrypted password into p24 */
142/* Note that password must be uppercased and null terminated */
143int
144SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24)
145{
146 int rc;
147 unsigned char p14[14], p16[16], p21[21];
148
149 memset(p14, '\0', 14);
150 memset(p16, '\0', 16);
151 memset(p21, '\0', 21);
152
153 memcpy(p14, passwd, 14);
154 rc = E_P16(p14, p16);
155 if (rc)
156 return rc;
157
158 memcpy(p21, p16, 16);
159 rc = E_P24(p21, c8, p24);
160
161 return rc;
162}
163
164/*
165 * Creates the MD4 Hash of the users password in NT UNICODE.
166 */
167
168int
169E_md4hash(const unsigned char *passwd, unsigned char *p16,
170 const struct nls_table *codepage)
171{
172 int rc;
173 int len;
174 __le16 wpwd[129];
175
176 /* Password cannot be longer than 128 characters */
177 if (passwd) /* Password must be converted to NT unicode */
178 len = cifs_strtoUTF16(wpwd, passwd, 128, codepage);
179 else {
180 len = 0;
181 *wpwd = 0; /* Ensure string is null terminated */
182 }
183
184 rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16));
185 memzero_explicit(wpwd, sizeof(wpwd));
186
187 return rc;
188}
189
190/* Does the NT MD4 hash then des encryption. */
191int
192SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24,
193 const struct nls_table *codepage)
194{
195 int rc;
196 unsigned char p16[16], p21[21];
197
198 memset(p16, '\0', 16);
199 memset(p21, '\0', 21);
200
201 rc = E_md4hash(passwd, p16, codepage);
202 if (rc) {
203 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
204 __func__, rc);
205 return rc;
206 }
207 memcpy(p21, p16, 16);
208 rc = E_P24(p21, c8, p24);
209 return rc;
210}