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/crypto.h>
15 #include <linux/module.h>
16 #include <linux/slab.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
28 #ifndef false
29 #define false 0
30 #endif
31 #ifndef true
32 #define true 1
33 #endif
34
35 /* following came from the other byteorder.h to avoid include conflicts */
36 #define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
37 #define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
38 #define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
39
40 static void
41 str_to_key(unsigned char *str, unsigned char *key)
42 {
43 int i;
44
45 key[0] = str[0] >> 1;
46 key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2);
47 key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3);
48 key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4);
49 key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5);
50 key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6);
51 key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7);
52 key[7] = str[6] & 0x7F;
53 for (i = 0; i < 8; i++)
54 key[i] = (key[i] << 1);
55 }
56
57 static int
58 smbhash(unsigned char *out, const unsigned char *in, unsigned char *key)
59 {
60 unsigned char key2[8];
61 struct crypto_cipher *tfm_des;
62
63 str_to_key(key, key2);
64
65 tfm_des = crypto_alloc_cipher("des", 0, 0);
66 if (IS_ERR(tfm_des)) {
67 cifs_dbg(VFS, "could not allocate des crypto API\n");
68 return PTR_ERR(tfm_des);
69 }
70
71 crypto_cipher_setkey(tfm_des, key2, 8);
72 crypto_cipher_encrypt_one(tfm_des, out, in);
73 crypto_free_cipher(tfm_des);
74
75 return 0;
76 }
77
78 static int
79 E_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
92 static int
93 E_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 */
108 int
109 mdfour(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
133 mdfour_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 */
143 int
144 SMBencrypt(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
168 int
169 E_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. */
191 int
192 SMBNTencrypt(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 }
211
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