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Commit | Line | Data |
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790fe579 | 1 | /* |
1da177e4 LT |
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 | |
50c2f753 | 10 | |
1da177e4 LT |
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. | |
50c2f753 | 15 | |
1da177e4 LT |
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. | |
50c2f753 | 20 | |
1da177e4 LT |
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> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
1da177e4 LT |
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" | |
3979877e | 34 | #include "cifsglob.h" |
1da177e4 | 35 | #include "cifs_debug.h" |
ee2c9258 | 36 | #include "cifsproto.h" |
1da177e4 | 37 | |
4b18f2a9 SF |
38 | #ifndef false |
39 | #define false 0 | |
1da177e4 | 40 | #endif |
4b18f2a9 SF |
41 | #ifndef true |
42 | #define true 1 | |
1da177e4 LT |
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 | ||
43988d76 SF |
50 | static void |
51 | str_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 | ||
67 | static int | |
68 | smbhash(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); | |
f96637be | 81 | cifs_dbg(VFS, "could not allocate des crypto API\n"); |
43988d76 SF |
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); | |
e4fb0edb | 93 | if (rc) |
f96637be | 94 | cifs_dbg(VFS, "could not encrypt crypt key rc: %d\n", rc); |
43988d76 | 95 | |
e4fb0edb | 96 | crypto_free_blkcipher(tfm_des); |
43988d76 SF |
97 | smbhash_err: |
98 | return rc; | |
99 | } | |
100 | ||
101 | static int | |
102 | E_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 | ||
115 | static int | |
116 | E_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 | ||
ee2c9258 SP |
130 | /* produce a md4 message digest from data of length n bytes */ |
131 | int | |
132 | mdfour(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)) { | |
ffeb414a | 141 | rc = PTR_ERR(md4); |
f96637be JP |
142 | cifs_dbg(VFS, "%s: Crypto md4 allocation error %d\n", |
143 | __func__, rc); | |
ffeb414a | 144 | return rc; |
ee2c9258 SP |
145 | } |
146 | size = sizeof(struct shash_desc) + crypto_shash_descsize(md4); | |
147 | sdescmd4 = kmalloc(size, GFP_KERNEL); | |
148 | if (!sdescmd4) { | |
149 | rc = -ENOMEM; | |
ee2c9258 SP |
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) { | |
f96637be | 157 | cifs_dbg(VFS, "%s: Could not init md4 shash\n", __func__); |
ee2c9258 SP |
158 | goto mdfour_err; |
159 | } | |
14cae324 SP |
160 | rc = crypto_shash_update(&sdescmd4->shash, link_str, link_len); |
161 | if (rc) { | |
f96637be | 162 | cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__); |
14cae324 SP |
163 | goto mdfour_err; |
164 | } | |
ee2c9258 | 165 | rc = crypto_shash_final(&sdescmd4->shash, md4_hash); |
14cae324 | 166 | if (rc) |
f96637be | 167 | cifs_dbg(VFS, "%s: Could not generate md4 hash\n", __func__); |
1da177e4 | 168 | |
ee2c9258 SP |
169 | mdfour_err: |
170 | crypto_free_shash(md4); | |
171 | kfree(sdescmd4); | |
172 | ||
173 | return rc; | |
174 | } | |
175 | ||
1da177e4 LT |
176 | /* |
177 | This implements the X/Open SMB password encryption | |
790fe579 | 178 | It takes a password, a 8 byte "crypt key" and puts 24 bytes of |
1da177e4 LT |
179 | encrypted password into p24 */ |
180 | /* Note that password must be uppercased and null terminated */ | |
43988d76 | 181 | int |
4e53a3fb | 182 | SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24) |
1da177e4 | 183 | { |
43988d76 SF |
184 | int rc; |
185 | unsigned char p14[14], p16[16], p21[21]; | |
1da177e4 | 186 | |
1da177e4 | 187 | memset(p14, '\0', 14); |
43988d76 SF |
188 | memset(p16, '\0', 16); |
189 | memset(p21, '\0', 21); | |
1da177e4 | 190 | |
43988d76 SF |
191 | memcpy(p14, passwd, 14); |
192 | rc = E_P16(p14, p16); | |
193 | if (rc) | |
194 | return rc; | |
1da177e4 | 195 | |
43988d76 SF |
196 | memcpy(p21, p16, 16); |
197 | rc = E_P24(p21, c8, p24); | |
50c2f753 | 198 | |
43988d76 | 199 | return rc; |
1da177e4 LT |
200 | } |
201 | ||
790fe579 | 202 | /* |
1da177e4 LT |
203 | * Creates the MD4 Hash of the users password in NT UNICODE. |
204 | */ | |
205 | ||
ee2c9258 | 206 | int |
9ef5992e SP |
207 | E_md4hash(const unsigned char *passwd, unsigned char *p16, |
208 | const struct nls_table *codepage) | |
1da177e4 | 209 | { |
ee2c9258 | 210 | int rc; |
1da177e4 | 211 | int len; |
9c32c63b | 212 | __le16 wpwd[129]; |
1da177e4 LT |
213 | |
214 | /* Password cannot be longer than 128 characters */ | |
9ef5992e | 215 | if (passwd) /* Password must be converted to NT unicode */ |
acbbb76a | 216 | len = cifs_strtoUTF16(wpwd, passwd, 128, codepage); |
9ef5992e | 217 | else { |
1da177e4 | 218 | len = 0; |
9ef5992e SP |
219 | *wpwd = 0; /* Ensure string is null terminated */ |
220 | } | |
1da177e4 | 221 | |
9c32c63b SF |
222 | rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16)); |
223 | memset(wpwd, 0, 129 * sizeof(__le16)); | |
ee2c9258 SP |
224 | |
225 | return rc; | |
1da177e4 LT |
226 | } |
227 | ||
1da177e4 | 228 | /* Does the NT MD4 hash then des encryption. */ |
ee2c9258 | 229 | int |
9ef5992e SP |
230 | SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24, |
231 | const struct nls_table *codepage) | |
1da177e4 | 232 | { |
ee2c9258 | 233 | int rc; |
43988d76 | 234 | unsigned char p16[16], p21[21]; |
1da177e4 | 235 | |
43988d76 | 236 | memset(p16, '\0', 16); |
1da177e4 LT |
237 | memset(p21, '\0', 21); |
238 | ||
9ef5992e | 239 | rc = E_md4hash(passwd, p16, codepage); |
ee2c9258 | 240 | if (rc) { |
f96637be JP |
241 | cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n", |
242 | __func__, rc); | |
ee2c9258 SP |
243 | return rc; |
244 | } | |
43988d76 SF |
245 | memcpy(p21, p16, 16); |
246 | rc = E_P24(p21, c8, p24); | |
ee2c9258 | 247 | return rc; |
1da177e4 | 248 | } |