src/vfs/smbfs/helpers/libsmb/smbencrypt.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    SMB parameters and setup
   5
   6    Copyright (C) Andrew Tridgell 1992-1998
   7
   8    Copyright (C) 2011
   9    The Free Software Foundation, Inc.
  10
  11    Modified by Jeremy Allison 1995.
  12
  13    This file is part of the Midnight Commander.
  14
  15    The Midnight Commander is free software: you can redistribute it
  16    and/or modify it under the terms of the GNU General Public License as
  17    published by the Free Software Foundation, either version 3 of the License,
  18    or (at your option) any later version.
  19
  20    The Midnight Commander is distributed in the hope that it will be useful,
  21    but WITHOUT ANY WARRANTY; without even the implied warranty of
  22    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23    GNU General Public License for more details.
  24
  25    You should have received a copy of the GNU General Public License
  26    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  27 */
  28
  29 #include "includes.h"
  30
  31 extern int DEBUGLEVEL;
  32
  33 #include "byteorder.h"
  34
  35 /*
  36    This implements the X/Open SMB password encryption
  37    It takes a password, a 8 byte "crypt key" and puts 24 bytes of
  38    encrypted password into p24 */
  39 void SMBencrypt(uchar *passwd, uchar *c8, uchar *p24)
  40 {
  41         uchar p14[15], p21[21];
  42
  43         memset(p21,'\0',21);
  44         memset(p14,'\0',14);
  45         StrnCpy((char *)p14,(char *)passwd,14);
  46
  47         strupper((char *)p14);
  48         E_P16(p14, p21);
  49
  50         SMBOWFencrypt(p21, c8, p24);
  51
  52 #ifdef DEBUG_PASSWORD
  53         DEBUG(100,("SMBencrypt: lm#, challenge, response\n"));
  54         dump_data(100, (char *)p21, 16);
  55         dump_data(100, (char *)c8, 8);
  56         dump_data(100, (char *)p24, 24);
  57 #endif
  58 }
  59
  60 /* Routines for Windows NT MD4 Hash functions. */
  61 static int _my_wcslen(int16 *str)
  62 {
  63         int len = 0;
  64         while(*str++ != 0)
  65                 len++;
  66         return len;
  67 }
  68
  69 /*
  70  * Convert a string into an NT UNICODE string.
  71  * Note that regardless of processor type
  72  * this must be in intel (little-endian)
  73  * format.
  74  */
  75
  76 static int _my_mbstowcs(int16 *dst, uchar *src, int len)
  77 {
  78         int i;
  79         int16 val;
  80
  81         for(i = 0; i < len; i++) {
  82                 val = *src;
  83                 SSVAL(dst,0,val);
  84                 dst++;
  85                 src++;
  86                 if(val == 0)
  87                         break;
  88         }
  89         return i;
  90 }
  91
  92 /*
  93  * Creates the MD4 Hash of the users password in NT UNICODE.
  94  */
  95
  96 void E_md4hash(uchar *passwd, uchar *p16)
  97 {
  98         int len;
  99         int16 wpwd[129];
 100
 101         /* Password cannot be longer than 128 characters */
 102         len = strlen((char *)passwd);
 103         if(len > 128)
 104                 len = 128;
 105         /* Password must be converted to NT unicode */
 106         _my_mbstowcs(wpwd, passwd, len);
 107         wpwd[len] = 0; /* Ensure string is null terminated */
 108         /* Calculate length in bytes */
 109         len = _my_wcslen(wpwd) * sizeof(int16);
 110
 111         mdfour(p16, (unsigned char *)wpwd, len);
 112 }
 113
 114 /* Does both the NT and LM owfs of a user's password */
 115 void nt_lm_owf_gen(char *pwd, uchar nt_p16[16], uchar p16[16])
 116 {
 117         char passwd[130];
 118
 119         memset(passwd,'\0',130);
 120         safe_strcpy( passwd, pwd, sizeof(passwd)-1);
 121
 122         /* Calculate the MD4 hash (NT compatible) of the password */
 123         memset(nt_p16, '\0', 16);
 124         E_md4hash((uchar *)passwd, nt_p16);
 125
 126 #ifdef DEBUG_PASSWORD
 127         DEBUG(100,("nt_lm_owf_gen: pwd, nt#\n"));
 128         dump_data(120, passwd, strlen(passwd));
 129         dump_data(100, (char *)nt_p16, 16);
 130 #endif
 131
 132         /* Mangle the passwords into Lanman format */
 133         passwd[14] = '\0';
 134         strupper(passwd);
 135
 136         /* Calculate the SMB (lanman) hash functions of the password */
 137
 138         memset(p16, '\0', 16);
 139         E_P16((uchar *) passwd, (uchar *)p16);
 140
 141 #ifdef DEBUG_PASSWORD
 142         DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n"));
 143         dump_data(120, passwd, strlen(passwd));
 144         dump_data(100, (char *)p16, 16);
 145 #endif
 146         /* clear out local copy of user's password (just being paranoid). */
 147         memset(passwd, '\0', sizeof(passwd));
 148 }
 149
 150 /* Does the des encryption from the NT or LM MD4 hash. */
 151 void SMBOWFencrypt(uchar passwd[16], uchar *c8, uchar p24[24])
 152 {
 153         uchar p21[21];
 154
 155         memset(p21,'\0',21);
 156
 157         memcpy(p21, passwd, 16);
 158         E_P24(p21, c8, p24);
 159 }
 160
 161 /* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
 162 void NTLMSSPOWFencrypt(uchar passwd[8], uchar *ntlmchalresp, uchar p24[24])
 163 {
 164         uchar p21[21];
 165
 166         memset(p21,'\0',21);
 167         memcpy(p21, passwd, 8);
 168         memset(p21 + 8, 0xbd, 8);
 169
 170         E_P24(p21, ntlmchalresp, p24);
 171 #ifdef DEBUG_PASSWORD
 172         DEBUG(100,("NTLMSSPOWFencrypt: p21, c8, p24\n"));
 173         dump_data(100, (char *)p21, 21);
 174         dump_data(100, (char *)ntlmchalresp, 8);
 175         dump_data(100, (char *)p24, 24);
 176 #endif
 177 }
 178
 179
 180 /* Does the NT MD4 hash then des encryption. */
 181
 182 void SMBNTencrypt(uchar *passwd, uchar *c8, uchar *p24)
 183 {
 184         uchar p21[21];
 185
 186         memset(p21,'\0',21);
 187
 188         E_md4hash(passwd, p21);
 189         SMBOWFencrypt(p21, c8, p24);
 190
 191 #ifdef DEBUG_PASSWORD
 192         DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
 193         dump_data(100, (char *)p21, 16);
 194         dump_data(100, (char *)c8, 8);
 195         dump_data(100, (char *)p24, 24);
 196 #endif
 197 }