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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 <crypto/skcipher.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 int rc;
73 unsigned char key2[8];
74 struct crypto_skcipher *tfm_des;
75 struct scatterlist sgin, sgout;
76 struct skcipher_request *req;
77
78 str_to_key(key, key2);
79
80 tfm_des = crypto_alloc_skcipher("ecb(des)", 0, CRYPTO_ALG_ASYNC);
81 if (IS_ERR(tfm_des)) {
82 rc = PTR_ERR(tfm_des);
83 cifs_dbg(VFS, "could not allocate des crypto API\n");
84 goto smbhash_err;
85 }
86
87 req = skcipher_request_alloc(tfm_des, GFP_KERNEL);
88 if (!req) {
89 rc = -ENOMEM;
90 cifs_dbg(VFS, "could not allocate des crypto API\n");
91 goto smbhash_free_skcipher;
92 }
93
94 crypto_skcipher_setkey(tfm_des, key2, 8);
95
96 sg_init_one(&sgin, in, 8);
97 sg_init_one(&sgout, out, 8);
98
99 skcipher_request_set_callback(req, 0, NULL, NULL);
100 skcipher_request_set_crypt(req, &sgin, &sgout, 8, NULL);
101
102 rc = crypto_skcipher_encrypt(req);
103 if (rc)
104 cifs_dbg(VFS, "could not encrypt crypt key rc: %d\n", rc);
105
106 skcipher_request_free(req);
107
108smbhash_free_skcipher:
109 crypto_free_skcipher(tfm_des);
110smbhash_err:
111 return rc;
112}
113
114static int
115E_P16(unsigned char *p14, unsigned char *p16)
116{
117 int rc;
118 unsigned char sp8[8] =
119 { 0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25 };
120
121 rc = smbhash(p16, sp8, p14);
122 if (rc)
123 return rc;
124 rc = smbhash(p16 + 8, sp8, p14 + 7);
125 return rc;
126}
127
128static int
129E_P24(unsigned char *p21, const unsigned char *c8, unsigned char *p24)
130{
131 int rc;
132
133 rc = smbhash(p24, c8, p21);
134 if (rc)
135 return rc;
136 rc = smbhash(p24 + 8, c8, p21 + 7);
137 if (rc)
138 return rc;
139 rc = smbhash(p24 + 16, c8, p21 + 14);
140 return rc;
141}
142
143/* produce a md4 message digest from data of length n bytes */
144int
145mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len)
146{
147 int rc;
148 unsigned int size;
149 struct crypto_shash *md4;
150 struct sdesc *sdescmd4;
151
152 md4 = crypto_alloc_shash("md4", 0, 0);
153 if (IS_ERR(md4)) {
154 rc = PTR_ERR(md4);
155 cifs_dbg(VFS, "%s: Crypto md4 allocation error %d\n",
156 __func__, rc);
157 return rc;
158 }
159 size = sizeof(struct shash_desc) + crypto_shash_descsize(md4);
160 sdescmd4 = kmalloc(size, GFP_KERNEL);
161 if (!sdescmd4) {
162 rc = -ENOMEM;
163 goto mdfour_err;
164 }
165 sdescmd4->shash.tfm = md4;
166 sdescmd4->shash.flags = 0x0;
167
168 rc = crypto_shash_init(&sdescmd4->shash);
169 if (rc) {
170 cifs_dbg(VFS, "%s: Could not init md4 shash\n", __func__);
171 goto mdfour_err;
172 }
173 rc = crypto_shash_update(&sdescmd4->shash, link_str, link_len);
174 if (rc) {
175 cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__);
176 goto mdfour_err;
177 }
178 rc = crypto_shash_final(&sdescmd4->shash, md4_hash);
179 if (rc)
180 cifs_dbg(VFS, "%s: Could not generate md4 hash\n", __func__);
181
182mdfour_err:
183 crypto_free_shash(md4);
184 kfree(sdescmd4);
185
186 return rc;
187}
188
189/*
190 This implements the X/Open SMB password encryption
191 It takes a password, a 8 byte "crypt key" and puts 24 bytes of
192 encrypted password into p24 */
193/* Note that password must be uppercased and null terminated */
194int
195SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24)
196{
197 int rc;
198 unsigned char p14[14], p16[16], p21[21];
199
200 memset(p14, '\0', 14);
201 memset(p16, '\0', 16);
202 memset(p21, '\0', 21);
203
204 memcpy(p14, passwd, 14);
205 rc = E_P16(p14, p16);
206 if (rc)
207 return rc;
208
209 memcpy(p21, p16, 16);
210 rc = E_P24(p21, c8, p24);
211
212 return rc;
213}
214
215/*
216 * Creates the MD4 Hash of the users password in NT UNICODE.
217 */
218
219int
220E_md4hash(const unsigned char *passwd, unsigned char *p16,
221 const struct nls_table *codepage)
222{
223 int rc;
224 int len;
225 __le16 wpwd[129];
226
227 /* Password cannot be longer than 128 characters */
228 if (passwd) /* Password must be converted to NT unicode */
229 len = cifs_strtoUTF16(wpwd, passwd, 128, codepage);
230 else {
231 len = 0;
232 *wpwd = 0; /* Ensure string is null terminated */
233 }
234
235 rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16));
236 memzero_explicit(wpwd, sizeof(wpwd));
237
238 return rc;
239}
240
241/* Does the NT MD4 hash then des encryption. */
242int
243SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24,
244 const struct nls_table *codepage)
245{
246 int rc;
247 unsigned char p16[16], p21[21];
248
249 memset(p16, '\0', 16);
250 memset(p21, '\0', 21);
251
252 rc = E_md4hash(passwd, p16, codepage);
253 if (rc) {
254 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
255 __func__, rc);
256 return rc;
257 }
258 memcpy(p21, p16, 16);
259 rc = E_P24(p21, c8, p24);
260 return rc;
261}