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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 | ||
52 | static void | |
53 | str_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 | ||
69 | static int | |
70 | smbhash(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 | ||
90 | static int | |
91 | E_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 | ||
104 | static int | |
105 | E_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 */ | |
120 | int | |
121 | mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len) | |
122 | { | |
123 | int rc; | |
124 | unsigned int size; | |
125 | struct crypto_shash *md4; | |
126 | struct sdesc *sdescmd4; | |
127 | ||
128 | md4 = crypto_alloc_shash("md4", 0, 0); | |
129 | if (IS_ERR(md4)) { | |
130 | rc = PTR_ERR(md4); | |
131 | cifs_dbg(VFS, "%s: Crypto md4 allocation error %d\n", | |
132 | __func__, rc); | |
133 | return rc; | |
134 | } | |
135 | size = sizeof(struct shash_desc) + crypto_shash_descsize(md4); | |
136 | sdescmd4 = kmalloc(size, GFP_KERNEL); | |
137 | if (!sdescmd4) { | |
138 | rc = -ENOMEM; | |
139 | goto mdfour_err; | |
140 | } | |
141 | sdescmd4->shash.tfm = md4; | |
142 | sdescmd4->shash.flags = 0x0; | |
143 | ||
144 | rc = crypto_shash_init(&sdescmd4->shash); | |
145 | if (rc) { | |
146 | cifs_dbg(VFS, "%s: Could not init md4 shash\n", __func__); | |
147 | goto mdfour_err; | |
148 | } | |
149 | rc = crypto_shash_update(&sdescmd4->shash, link_str, link_len); | |
150 | if (rc) { | |
151 | cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__); | |
152 | goto mdfour_err; | |
153 | } | |
154 | rc = crypto_shash_final(&sdescmd4->shash, md4_hash); | |
155 | if (rc) | |
156 | cifs_dbg(VFS, "%s: Could not generate md4 hash\n", __func__); | |
157 | ||
158 | mdfour_err: | |
159 | crypto_free_shash(md4); | |
160 | kfree(sdescmd4); | |
161 | ||
162 | return rc; | |
163 | } | |
164 | ||
165 | /* | |
166 | This implements the X/Open SMB password encryption | |
167 | It takes a password, a 8 byte "crypt key" and puts 24 bytes of | |
168 | encrypted password into p24 */ | |
169 | /* Note that password must be uppercased and null terminated */ | |
170 | int | |
171 | SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24) | |
172 | { | |
173 | int rc; | |
174 | unsigned char p14[14], p16[16], p21[21]; | |
175 | ||
176 | memset(p14, '\0', 14); | |
177 | memset(p16, '\0', 16); | |
178 | memset(p21, '\0', 21); | |
179 | ||
180 | memcpy(p14, passwd, 14); | |
181 | rc = E_P16(p14, p16); | |
182 | if (rc) | |
183 | return rc; | |
184 | ||
185 | memcpy(p21, p16, 16); | |
186 | rc = E_P24(p21, c8, p24); | |
187 | ||
188 | return rc; | |
189 | } | |
190 | ||
191 | /* | |
192 | * Creates the MD4 Hash of the users password in NT UNICODE. | |
193 | */ | |
194 | ||
195 | int | |
196 | E_md4hash(const unsigned char *passwd, unsigned char *p16, | |
197 | const struct nls_table *codepage) | |
198 | { | |
199 | int rc; | |
200 | int len; | |
201 | __le16 wpwd[129]; | |
202 | ||
203 | /* Password cannot be longer than 128 characters */ | |
204 | if (passwd) /* Password must be converted to NT unicode */ | |
205 | len = cifs_strtoUTF16(wpwd, passwd, 128, codepage); | |
206 | else { | |
207 | len = 0; | |
208 | *wpwd = 0; /* Ensure string is null terminated */ | |
209 | } | |
210 | ||
211 | rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16)); | |
212 | memzero_explicit(wpwd, sizeof(wpwd)); | |
213 | ||
214 | return rc; | |
215 | } | |
216 | ||
217 | /* Does the NT MD4 hash then des encryption. */ | |
218 | int | |
219 | SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24, | |
220 | const struct nls_table *codepage) | |
221 | { | |
222 | int rc; | |
223 | unsigned char p16[16], p21[21]; | |
224 | ||
225 | memset(p16, '\0', 16); | |
226 | memset(p21, '\0', 21); | |
227 | ||
228 | rc = E_md4hash(passwd, p16, codepage); | |
229 | if (rc) { | |
230 | cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n", | |
231 | __func__, rc); | |
232 | return rc; | |
233 | } | |
234 | memcpy(p21, p16, 16); | |
235 | rc = E_P24(p21, c8, p24); | |
236 | return rc; | |
237 | } |