release/src-rt-6.x.4708/linux/linux-2.6.36/fs/cifs/smbencrypt.c

   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
 147 /* Does the NTLMv2 owfs of a user's password */
 148
 149 /* Does the des encryption from the NT or LM MD4 hash. */
 150 static void
 151 SMBOWFencrypt(unsigned char passwd[16], const unsigned char *c8,
 152               unsigned char p24[24])
 153 {
 154         unsigned char p21[21];
 155
 156         memset(p21, '\0', 21);
 157
 158         memcpy(p21, passwd, 16);
 159         E_P24(p21, c8, p24);
 160 }
 161
 162 /* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
 163
 164 /* Does the NT MD4 hash then des encryption. */
 165
 166 void
 167 SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24)
 168 {
 169         unsigned char p21[21];
 170
 171         memset(p21, '\0', 21);
 172
 173         E_md4hash(passwd, p21);
 174         SMBOWFencrypt(p21, c8, p24);
 175 }
 176
 177
 178 /* Does the md5 encryption from the NT hash for NTLMv2. */
 179 /* These routines will be needed later */