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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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/module.h>
27#include <linux/fs.h>
28#include <linux/string.h>
29#include <linux/kernel.h>
30#include <linux/random.h>
31#include "cifs_unicode.h"
32#include "cifspdu.h"
33#include "md5.h"
34#include "cifs_debug.h"
35#include "cifsencrypt.h"
36
37#ifndef FALSE
38#define FALSE 0
39#endif
40#ifndef TRUE
41#define TRUE 1
42#endif
43
44/* following came from the other byteorder.h to avoid include conflicts */
45#define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
46#define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
47#define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
48
49/*The following definitions come from libsmb/smbencrypt.c */
50
51void SMBencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24);
52void E_md4hash(const unsigned char *passwd, unsigned char *p16);
53void nt_lm_owf_gen(char *pwd, unsigned char nt_p16[16], unsigned char p16[16]);
54static void SMBOWFencrypt(unsigned char passwd[16], unsigned char *c8,
55 unsigned char p24[24]);
56void NTLMSSPOWFencrypt(unsigned char passwd[8],
57 unsigned char *ntlmchalresp, unsigned char p24[24]);
58void SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24);
59
60/*
61 This implements the X/Open SMB password encryption
62 It takes a password, a 8 byte "crypt key" and puts 24 bytes of
63 encrypted password into p24 */
64/* Note that password must be uppercased and null terminated */
65void
66SMBencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24)
67{
68 unsigned char p14[15], p21[21];
69
70 memset(p21, '\0', 21);
71 memset(p14, '\0', 14);
72 strncpy((char *) p14, (char *) passwd, 14);
73
74/* strupper((char *)p14); *//* BB at least uppercase the easy range */
75 E_P16(p14, p21);
76
77 SMBOWFencrypt(p21, c8, p24);
78
79 memset(p14,0,15);
80 memset(p21,0,21);
81}
82
83/* Routines for Windows NT MD4 Hash functions. */
84static int
85_my_wcslen(__u16 * str)
86{
87 int len = 0;
88 while (*str++ != 0)
89 len++;
90 return len;
91}
92
93/*
94 * Convert a string into an NT UNICODE string.
95 * Note that regardless of processor type
96 * this must be in intel (little-endian)
97 * format.
98 */
99
100static int
101_my_mbstowcs(__u16 * dst, const unsigned char *src, int len)
102{ /* not a very good conversion routine - change/fix */
103 int i;
104 __u16 val;
105
106 for (i = 0; i < len; i++) {
107 val = *src;
108 SSVAL(dst, 0, val);
109 dst++;
110 src++;
111 if (val == 0)
112 break;
113 }
114 return i;
115}
116
117/*
118 * Creates the MD4 Hash of the users password in NT UNICODE.
119 */
120
121void
122E_md4hash(const unsigned char *passwd, unsigned char *p16)
123{
124 int len;
125 __u16 wpwd[129];
126
127 /* Password cannot be longer than 128 characters */
128 if(passwd) {
129 len = strlen((char *) passwd);
130 if (len > 128) {
131 len = 128;
132 }
133 /* Password must be converted to NT unicode */
134 _my_mbstowcs(wpwd, passwd, len);
135 } else
136 len = 0;
137
138 wpwd[len] = 0; /* Ensure string is null terminated */
139 /* Calculate length in bytes */
140 len = _my_wcslen(wpwd) * sizeof (__u16);
141
142 mdfour(p16, (unsigned char *) wpwd, len);
143 memset(wpwd,0,129 * 2);
144}
145
146/* Does both the NT and LM owfs of a user's password */
147void
148nt_lm_owf_gen(char *pwd, unsigned char nt_p16[16], unsigned char p16[16])
149{
150 char passwd[514];
151
152 memset(passwd, '\0', 514);
153 if (strlen(pwd) < 513)
154 strcpy(passwd, pwd);
155 else
156 memcpy(passwd, pwd, 512);
157 /* Calculate the MD4 hash (NT compatible) of the password */
158 memset(nt_p16, '\0', 16);
159 E_md4hash(passwd, nt_p16);
160
161 /* Mangle the passwords into Lanman format */
162 passwd[14] = '\0';
163/* strupper(passwd); */
164
165 /* Calculate the SMB (lanman) hash functions of the password */
166
167 memset(p16, '\0', 16);
168 E_P16((unsigned char *) passwd, (unsigned char *) p16);
169
170 /* clear out local copy of user's password (just being paranoid). */
171 memset(passwd, '\0', sizeof (passwd));
172}
173
174/* Does the NTLMv2 owfs of a user's password */
175#if 0 /* function not needed yet - but will be soon */
176static void
177ntv2_owf_gen(const unsigned char owf[16], const char *user_n,
178 const char *domain_n, unsigned char kr_buf[16],
179 const struct nls_table *nls_codepage)
180{
181 wchar_t * user_u;
182 wchar_t * dom_u;
183 int user_l, domain_l;
184 struct HMACMD5Context ctx;
185
186 /* might as well do one alloc to hold both (user_u and dom_u) */
187 user_u = kmalloc(2048 * sizeof(wchar_t),GFP_KERNEL);
188 if(user_u == NULL)
189 return;
190 dom_u = user_u + 1024;
191
192 /* push_ucs2(NULL, user_u, user_n, (user_l+1)*2, STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER);
193 push_ucs2(NULL, dom_u, domain_n, (domain_l+1)*2, STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER); */
194
195 /* BB user and domain may need to be uppercased */
196 user_l = cifs_strtoUCS(user_u, user_n, 511, nls_codepage);
197 domain_l = cifs_strtoUCS(dom_u, domain_n, 511, nls_codepage);
198
199 user_l++; /* trailing null */
200 domain_l++;
201
202 hmac_md5_init_limK_to_64(owf, 16, &ctx);
203 hmac_md5_update((const unsigned char *) user_u, user_l * 2, &ctx);
204 hmac_md5_update((const unsigned char *) dom_u, domain_l * 2, &ctx);
205 hmac_md5_final(kr_buf, &ctx);
206
207 kfree(user_u);
208}
209#endif
210
211/* Does the des encryption from the NT or LM MD4 hash. */
212static void
213SMBOWFencrypt(unsigned char passwd[16], unsigned char *c8,
214 unsigned char p24[24])
215{
216 unsigned char p21[21];
217
218 memset(p21, '\0', 21);
219
220 memcpy(p21, passwd, 16);
221 E_P24(p21, c8, p24);
222}
223
224/* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
225void
226NTLMSSPOWFencrypt(unsigned char passwd[8],
227 unsigned char *ntlmchalresp, unsigned char p24[24])
228{
229 unsigned char p21[21];
230
231 memset(p21, '\0', 21);
232 memcpy(p21, passwd, 8);
233 memset(p21 + 8, 0xbd, 8);
234
235 E_P24(p21, ntlmchalresp, p24);
236}
237
238/* Does the NT MD4 hash then des encryption. */
239
240void
241SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24)
242{
243 unsigned char p21[21];
244
245 memset(p21, '\0', 21);
246
247 E_md4hash(passwd, p21);
248 SMBOWFencrypt(p21, c8, p24);
249}
250
251
252/* Does the md5 encryption from the NT hash for NTLMv2. */
253/* These routines will be needed later */
254#if 0
255static void
256SMBOWFencrypt_ntv2(const unsigned char kr[16],
257 const struct data_blob * srv_chal,
258 const struct data_blob * cli_chal, unsigned char resp_buf[16])
259{
260 struct HMACMD5Context ctx;
261
262 hmac_md5_init_limK_to_64(kr, 16, &ctx);
263 hmac_md5_update(srv_chal->data, srv_chal->length, &ctx);
264 hmac_md5_update(cli_chal->data, cli_chal->length, &ctx);
265 hmac_md5_final(resp_buf, &ctx);
266}
267
268static void
269SMBsesskeygen_ntv2(const unsigned char kr[16],
270 const unsigned char *nt_resp, __u8 sess_key[16])
271{
272 struct HMACMD5Context ctx;
273
274 hmac_md5_init_limK_to_64(kr, 16, &ctx);
275 hmac_md5_update(nt_resp, 16, &ctx);
276 hmac_md5_final((unsigned char *) sess_key, &ctx);
277}
278
279static void
280SMBsesskeygen_ntv1(const unsigned char kr[16],
281 const unsigned char *nt_resp, __u8 sess_key[16])
282{
283 mdfour((unsigned char *) sess_key, (unsigned char *) kr, 16);
284}
285#endif