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/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 "cifsglob.h"
34 #include "md5.h"
35 #include "cifs_debug.h"
36 #include "cifsencrypt.h"
37
38 #ifndef false
39 #define false 0
40 #endif
41 #ifndef true
42 #define true 1
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
50 /*The following definitions come from libsmb/smbencrypt.c */
51
52 void SMBencrypt(unsigned char *passwd, const unsigned char *c8,
53 unsigned char *p24);
54 void E_md4hash(const unsigned char *passwd, unsigned char *p16);
55 static void SMBOWFencrypt(unsigned char passwd[16], const unsigned char *c8,
56 unsigned char p24[24]);
57 void SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24);
58
59 /*
60 This implements the X/Open SMB password encryption
61 It takes a password, a 8 byte "crypt key" and puts 24 bytes of
62 encrypted password into p24 */
63 /* Note that password must be uppercased and null terminated */
64 void
SMBencrypt(unsigned char * passwd,const unsigned char * c8,unsigned char * p24)65 SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24)
66 {
67 unsigned char p14[15], p21[21];
68
69 memset(p21, '\0', 21);
70 memset(p14, '\0', 14);
71 strncpy((char *) p14, (char *) passwd, 14);
72
73 /* strupper((char *)p14); *//* BB at least uppercase the easy range */
74 E_P16(p14, p21);
75
76 SMBOWFencrypt(p21, c8, p24);
77
78 memset(p14, 0, 15);
79 memset(p21, 0, 21);
80 }
81
82 /* Routines for Windows NT MD4 Hash functions. */
83 static int
_my_wcslen(__u16 * str)84 _my_wcslen(__u16 *str)
85 {
86 int len = 0;
87 while (*str++ != 0)
88 len++;
89 return len;
90 }
91
92 /*
93 * Convert a string into an NT UNICODE string.
94 * Note that regardless of processor type
95 * this must be in intel (little-endian)
96 * format.
97 */
98
99 static int
_my_mbstowcs(__u16 * dst,const unsigned char * src,int len)100 _my_mbstowcs(__u16 *dst, const unsigned char *src, int len)
101 { /* BB not a very good conversion routine - change/fix */
102 int i;
103 __u16 val;
104
105 for (i = 0; i < len; i++) {
106 val = *src;
107 SSVAL(dst, 0, val);
108 dst++;
109 src++;
110 if (val == 0)
111 break;
112 }
113 return i;
114 }
115
116 /*
117 * Creates the MD4 Hash of the users password in NT UNICODE.
118 */
119
120 void
E_md4hash(const unsigned char * passwd,unsigned char * p16)121 E_md4hash(const unsigned char *passwd, unsigned char *p16)
122 {
123 int len;
124 __u16 wpwd[129];
125
126 /* Password cannot be longer than 128 characters */
127 if (passwd) {
128 len = strlen((char *) passwd);
129 if (len > 128)
130 len = 128;
131
132 /* Password must be converted to NT unicode */
133 _my_mbstowcs(wpwd, passwd, len);
134 } else
135 len = 0;
136
137 wpwd[len] = 0; /* Ensure string is null terminated */
138 /* Calculate length in bytes */
139 len = _my_wcslen(wpwd) * sizeof(__u16);
140
141 mdfour(p16, (unsigned char *) wpwd, len);
142 memset(wpwd, 0, 129 * 2);
143 }
144
145 #if 0 /* currently unused */
146 /* Does both the NT and LM owfs of a user's password */
147 static void
148 nt_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 #endif
174
175 /* Does the NTLMv2 owfs of a user's password */
176 #if 0 /* function not needed yet - but will be soon */
177 static void
178 ntv2_owf_gen(const unsigned char owf[16], const char *user_n,
179 const char *domain_n, unsigned char kr_buf[16],
180 const struct nls_table *nls_codepage)
181 {
182 wchar_t *user_u;
183 wchar_t *dom_u;
184 int user_l, domain_l;
185 struct HMACMD5Context ctx;
186
187 /* might as well do one alloc to hold both (user_u and dom_u) */
188 user_u = kmalloc(2048 * sizeof(wchar_t), GFP_KERNEL);
189 if (user_u == NULL)
190 return;
191 dom_u = user_u + 1024;
192
193 /* push_ucs2(NULL, user_u, user_n, (user_l+1)*2,
194 STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER);
195 push_ucs2(NULL, dom_u, domain_n, (domain_l+1)*2,
196 STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER); */
197
198 /* BB user and domain may need to be uppercased */
199 user_l = cifs_strtoUCS(user_u, user_n, 511, nls_codepage);
200 domain_l = cifs_strtoUCS(dom_u, domain_n, 511, nls_codepage);
201
202 user_l++; /* trailing null */
203 domain_l++;
204
205 hmac_md5_init_limK_to_64(owf, 16, &ctx);
206 hmac_md5_update((const unsigned char *) user_u, user_l * 2, &ctx);
207 hmac_md5_update((const unsigned char *) dom_u, domain_l * 2, &ctx);
208 hmac_md5_final(kr_buf, &ctx);
209
210 kfree(user_u);
211 }
212 #endif
213
214 /* Does the des encryption from the NT or LM MD4 hash. */
215 static void
SMBOWFencrypt(unsigned char passwd[16],const unsigned char * c8,unsigned char p24[24])216 SMBOWFencrypt(unsigned char passwd[16], const unsigned char *c8,
217 unsigned char p24[24])
218 {
219 unsigned char p21[21];
220
221 memset(p21, '\0', 21);
222
223 memcpy(p21, passwd, 16);
224 E_P24(p21, c8, p24);
225 }
226
227 /* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
228 #if 0 /* currently unused */
229 static void
230 NTLMSSPOWFencrypt(unsigned char passwd[8],
231 unsigned char *ntlmchalresp, unsigned char p24[24])
232 {
233 unsigned char p21[21];
234
235 memset(p21, '\0', 21);
236 memcpy(p21, passwd, 8);
237 memset(p21 + 8, 0xbd, 8);
238
239 E_P24(p21, ntlmchalresp, p24);
240 }
241 #endif
242
243 /* Does the NT MD4 hash then des encryption. */
244
245 void
SMBNTencrypt(unsigned char * passwd,unsigned char * c8,unsigned char * p24)246 SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24)
247 {
248 unsigned char p21[21];
249
250 memset(p21, '\0', 21);
251
252 E_md4hash(passwd, p21);
253 SMBOWFencrypt(p21, c8, p24);
254 }
255
256
257 /* Does the md5 encryption from the NT hash for NTLMv2. */
258 /* These routines will be needed later */
259 #if 0
260 static void
261 SMBOWFencrypt_ntv2(const unsigned char kr[16],
262 const struct data_blob *srv_chal,
263 const struct data_blob *cli_chal, unsigned char resp_buf[16])
264 {
265 struct HMACMD5Context ctx;
266
267 hmac_md5_init_limK_to_64(kr, 16, &ctx);
268 hmac_md5_update(srv_chal->data, srv_chal->length, &ctx);
269 hmac_md5_update(cli_chal->data, cli_chal->length, &ctx);
270 hmac_md5_final(resp_buf, &ctx);
271 }
272
273 static void
274 SMBsesskeygen_ntv2(const unsigned char kr[16],
275 const unsigned char *nt_resp, __u8 sess_key[16])
276 {
277 struct HMACMD5Context ctx;
278
279 hmac_md5_init_limK_to_64(kr, 16, &ctx);
280 hmac_md5_update(nt_resp, 16, &ctx);
281 hmac_md5_final((unsigned char *) sess_key, &ctx);
282 }
283
284 static void
285 SMBsesskeygen_ntv1(const unsigned char kr[16],
286 const unsigned char *nt_resp, __u8 sess_key[16])
287 {
288 mdfour((unsigned char *) sess_key, (unsigned char *) kr, 16);
289 }
290 #endif
291