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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/module.h> |
27 | #include <linux/slab.h> |
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" |
34 | #include "cifsglob.h" |
35 | #include "md5.h" |
36 | #include "cifs_debug.h" |
37 | #include "cifsencrypt.h" |
38 | |
39 | #ifndef false |
40 | #define false 0 |
41 | #endif |
42 | #ifndef true |
43 | #define true 1 |
44 | #endif |
45 | |
46 | /* following came from the other byteorder.h to avoid include conflicts */ |
47 | #define CVAL(buf,pos) (((unsigned char *)(buf))[pos]) |
48 | #define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8) |
49 | #define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val))) |
50 | |
51 | /*The following definitions come from libsmb/smbencrypt.c */ |
52 | |
53 | void SMBencrypt(unsigned char *passwd, const unsigned char *c8, |
54 | unsigned char *p24); |
55 | void E_md4hash(const unsigned char *passwd, unsigned char *p16); |
56 | static void SMBOWFencrypt(unsigned char passwd[16], const unsigned char *c8, |
57 | unsigned char p24[24]); |
58 | void 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 */ |
65 | void |
66 | SMBencrypt(unsigned char *passwd, const 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. */ |
84 | static 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 | |
100 | static int |
101 | _my_mbstowcs(__u16 *dst, const unsigned char *src, int len) |
102 | { /* BB 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 | |
121 | void |
122 | E_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 | #if 0 /* currently unused */ |
147 | /* Does both the NT and LM owfs of a user's password */ |
148 | static void |
149 | nt_lm_owf_gen(char *pwd, unsigned char nt_p16[16], unsigned char p16[16]) |
150 | { |
151 | char passwd[514]; |
152 | |
153 | memset(passwd, '\0', 514); |
154 | if (strlen(pwd) < 513) |
155 | strcpy(passwd, pwd); |
156 | else |
157 | memcpy(passwd, pwd, 512); |
158 | /* Calculate the MD4 hash (NT compatible) of the password */ |
159 | memset(nt_p16, '\0', 16); |
160 | E_md4hash(passwd, nt_p16); |
161 | |
162 | /* Mangle the passwords into Lanman format */ |
163 | passwd[14] = '\0'; |
164 | /* strupper(passwd); */ |
165 | |
166 | /* Calculate the SMB (lanman) hash functions of the password */ |
167 | |
168 | memset(p16, '\0', 16); |
169 | E_P16((unsigned char *) passwd, (unsigned char *) p16); |
170 | |
171 | /* clear out local copy of user's password (just being paranoid). */ |
172 | memset(passwd, '\0', sizeof(passwd)); |
173 | } |
174 | #endif |
175 | |
176 | /* Does the NTLMv2 owfs of a user's password */ |
177 | #if 0 /* function not needed yet - but will be soon */ |
178 | static void |
179 | ntv2_owf_gen(const unsigned char owf[16], const char *user_n, |
180 | const char *domain_n, unsigned char kr_buf[16], |
181 | const struct nls_table *nls_codepage) |
182 | { |
183 | wchar_t *user_u; |
184 | wchar_t *dom_u; |
185 | int user_l, domain_l; |
186 | struct HMACMD5Context ctx; |
187 | |
188 | /* might as well do one alloc to hold both (user_u and dom_u) */ |
189 | user_u = kmalloc(2048 * sizeof(wchar_t), GFP_KERNEL); |
190 | if (user_u == NULL) |
191 | return; |
192 | dom_u = user_u + 1024; |
193 | |
194 | /* push_ucs2(NULL, user_u, user_n, (user_l+1)*2, |
195 | STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER); |
196 | push_ucs2(NULL, dom_u, domain_n, (domain_l+1)*2, |
197 | STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER); */ |
198 | |
199 | /* BB user and domain may need to be uppercased */ |
200 | user_l = cifs_strtoUCS(user_u, user_n, 511, nls_codepage); |
201 | domain_l = cifs_strtoUCS(dom_u, domain_n, 511, nls_codepage); |
202 | |
203 | user_l++; /* trailing null */ |
204 | domain_l++; |
205 | |
206 | hmac_md5_init_limK_to_64(owf, 16, &ctx); |
207 | hmac_md5_update((const unsigned char *) user_u, user_l * 2, &ctx); |
208 | hmac_md5_update((const unsigned char *) dom_u, domain_l * 2, &ctx); |
209 | hmac_md5_final(kr_buf, &ctx); |
210 | |
211 | kfree(user_u); |
212 | } |
213 | #endif |
214 | |
215 | /* Does the des encryption from the NT or LM MD4 hash. */ |
216 | static void |
217 | SMBOWFencrypt(unsigned char passwd[16], const unsigned char *c8, |
218 | unsigned char p24[24]) |
219 | { |
220 | unsigned char p21[21]; |
221 | |
222 | memset(p21, '\0', 21); |
223 | |
224 | memcpy(p21, passwd, 16); |
225 | E_P24(p21, c8, p24); |
226 | } |
227 | |
228 | /* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */ |
229 | #if 0 /* currently unused */ |
230 | static void |
231 | NTLMSSPOWFencrypt(unsigned char passwd[8], |
232 | unsigned char *ntlmchalresp, unsigned char p24[24]) |
233 | { |
234 | unsigned char p21[21]; |
235 | |
236 | memset(p21, '\0', 21); |
237 | memcpy(p21, passwd, 8); |
238 | memset(p21 + 8, 0xbd, 8); |
239 | |
240 | E_P24(p21, ntlmchalresp, p24); |
241 | } |
242 | #endif |
243 | |
244 | /* Does the NT MD4 hash then des encryption. */ |
245 | |
246 | void |
247 | SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24) |
248 | { |
249 | unsigned char p21[21]; |
250 | |
251 | memset(p21, '\0', 21); |
252 | |
253 | E_md4hash(passwd, p21); |
254 | SMBOWFencrypt(p21, c8, p24); |
255 | } |
256 | |
257 | |
258 | /* Does the md5 encryption from the NT hash for NTLMv2. */ |
259 | /* These routines will be needed later */ |
260 | #if 0 |
261 | static void |
262 | SMBOWFencrypt_ntv2(const unsigned char kr[16], |
263 | const struct data_blob *srv_chal, |
264 | const struct data_blob *cli_chal, unsigned char resp_buf[16]) |
265 | { |
266 | struct HMACMD5Context ctx; |
267 | |
268 | hmac_md5_init_limK_to_64(kr, 16, &ctx); |
269 | hmac_md5_update(srv_chal->data, srv_chal->length, &ctx); |
270 | hmac_md5_update(cli_chal->data, cli_chal->length, &ctx); |
271 | hmac_md5_final(resp_buf, &ctx); |
272 | } |
273 | |
274 | static void |
275 | SMBsesskeygen_ntv2(const unsigned char kr[16], |
276 | const unsigned char *nt_resp, __u8 sess_key[16]) |
277 | { |
278 | struct HMACMD5Context ctx; |
279 | |
280 | hmac_md5_init_limK_to_64(kr, 16, &ctx); |
281 | hmac_md5_update(nt_resp, 16, &ctx); |
282 | hmac_md5_final((unsigned char *) sess_key, &ctx); |
283 | } |
284 | |
285 | static void |
286 | SMBsesskeygen_ntv1(const unsigned char kr[16], |
287 | const unsigned char *nt_resp, __u8 sess_key[16]) |
288 | { |
289 | mdfour((unsigned char *) sess_key, (unsigned char *) kr, 16); |
290 | } |
291 | #endif |
292 |
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