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1da177e4 LT |
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 "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 | ||
51 | void SMBencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24); | |
52 | void E_md4hash(const unsigned char *passwd, unsigned char *p16); | |
53 | void nt_lm_owf_gen(char *pwd, unsigned char nt_p16[16], unsigned char p16[16]); | |
54 | static void SMBOWFencrypt(unsigned char passwd[16], unsigned char *c8, | |
55 | unsigned char p24[24]); | |
56 | void NTLMSSPOWFencrypt(unsigned char passwd[8], | |
57 | unsigned char *ntlmchalresp, 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, 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 | { /* 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 | /* Does both the NT and LM owfs of a user's password */ | |
147 | 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 | ||
174 | /* Does the NTLMv2 owfs of a user's password */ | |
175 | #if 0 /* function not needed yet - but will be soon */ | |
176 | static void | |
177 | ntv2_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. */ | |
212 | static void | |
213 | SMBOWFencrypt(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. */ | |
225 | void | |
226 | NTLMSSPOWFencrypt(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 | ||
240 | void | |
241 | SMBNTencrypt(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 | |
255 | static void | |
256 | SMBOWFencrypt_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 | ||
268 | static void | |
269 | SMBsesskeygen_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 | ||
279 | static void | |
280 | SMBsesskeygen_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 |