source/libsmb/smbencrypt.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    SMB parameters and setup
   5    Copyright (C) Andrew Tridgell 1992-1998
   6    Modified by Jeremy Allison 1995.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24
  25 #include "byteorder.h"
  26
  27 /*
  28    This implements the X/Open SMB password encryption
  29    It takes a password, a 8 byte "crypt key" and puts 24 bytes of
  30    encrypted password into p24 */
  31 void SMBencrypt(const uchar *passwd, uchar *c8, uchar *p24)
  32 {
  33         uchar p14[15], p21[21];
  34
  35         memset(p21,'\0',21);
  36         memset(p14,'\0',14);
  37         StrnCpy((char *)p14,(const char *)passwd,14);
  38
  39         strupper((char *)p14);
  40         E_P16(p14, p21);
  41
  42         SMBOWFencrypt(p21, c8, p24);
  43
  44 #ifdef DEBUG_PASSWORD
  45         DEBUG(100,("SMBencrypt: lm#, challenge, response\n"));
  46         dump_data(100, (char *)p21, 16);
  47         dump_data(100, (char *)c8, 8);
  48         dump_data(100, (char *)p24, 24);
  49 #endif
  50 }
  51
  52 /*
  53  * Creates the MD4 Hash of the users password in NT UNICODE.
  54  */
  55
  56 void E_md4hash(const uchar *passwd, uchar *p16)
  57 {
  58         int len;
  59         int16 wpwd[129];
  60
  61         /* Password cannot be longer than 128 characters */
  62         len = strlen((const char *)passwd);
  63         if(len > 128)
  64                 len = 128;
  65         /* Password must be converted to NT unicode - null terminated. */
  66         dos_struni2((char *)wpwd, (const char *)passwd, 256);
  67         /* Calculate length in bytes */
  68         len = strlen_w((const smb_ucs2_t *)wpwd) * sizeof(int16);
  69
  70         mdfour(p16, (unsigned char *)wpwd, len);
  71 }
  72
  73 /* Does both the NT and LM owfs of a user's password */
  74 void nt_lm_owf_gen(char *pwd, uchar nt_p16[16], uchar p16[16])
  75 {
  76         char passwd[514];
  77
  78         memset(passwd,'\0',514);
  79         safe_strcpy( passwd, pwd, sizeof(passwd)-1);
  80
  81         /* Calculate the MD4 hash (NT compatible) of the password */
  82         memset(nt_p16, '\0', 16);
  83         E_md4hash((uchar *)passwd, nt_p16);
  84
  85 #ifdef DEBUG_PASSWORD
  86         DEBUG(100,("nt_lm_owf_gen: pwd, nt#\n"));
  87         dump_data(120, passwd, strlen(passwd));
  88         dump_data(100, (char *)nt_p16, 16);
  89 #endif
  90
  91         /* Mangle the passwords into Lanman format */
  92         passwd[14] = '\0';
  93         strupper(passwd);
  94
  95         /* Calculate the SMB (lanman) hash functions of the password */
  96
  97         memset(p16, '\0', 16);
  98         E_P16((uchar *) passwd, (uchar *)p16);
  99
 100 #ifdef DEBUG_PASSWORD
 101         DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n"));
 102         dump_data(120, passwd, strlen(passwd));
 103         dump_data(100, (char *)p16, 16);
 104 #endif
 105         /* clear out local copy of user's password (just being paranoid). */
 106         memset(passwd, '\0', sizeof(passwd));
 107 }
 108
 109 /* Does the des encryption from the NT or LM MD4 hash. */
 110 void SMBOWFencrypt(uchar passwd[16], uchar *c8, uchar p24[24])
 111 {
 112         uchar p21[21];
 113
 114         memset(p21,'\0',21);
 115
 116         memcpy(p21, passwd, 16);
 117         E_P24(p21, c8, p24);
 118 }
 119
 120 /* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
 121 void NTLMSSPOWFencrypt(uchar passwd[8], uchar *ntlmchalresp, uchar p24[24])
 122 {
 123         uchar p21[21];
 124
 125         memset(p21,'\0',21);
 126         memcpy(p21, passwd, 8);
 127         memset(p21 + 8, 0xbd, 8);
 128
 129         E_P24(p21, ntlmchalresp, p24);
 130 #ifdef DEBUG_PASSWORD
 131         DEBUG(100,("NTLMSSPOWFencrypt: p21, c8, p24\n"));
 132         dump_data(100, (char *)p21, 21);
 133         dump_data(100, (char *)ntlmchalresp, 8);
 134         dump_data(100, (char *)p24, 24);
 135 #endif
 136 }
 137
 138
 139 /* Does the NT MD4 hash then des encryption. */
 140
 141 void SMBNTencrypt(const uchar *passwd, uchar *c8, uchar *p24)
 142 {
 143         uchar p21[21];
 144
 145         memset(p21,'\0',21);
 146
 147         E_md4hash(passwd, p21);
 148         SMBOWFencrypt(p21, c8, p24);
 149
 150 #ifdef DEBUG_PASSWORD
 151         DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
 152         dump_data(100, (char *)p21, 16);
 153         dump_data(100, (char *)c8, 8);
 154         dump_data(100, (char *)p24, 24);
 155 #endif
 156 }
 157
 158 BOOL make_oem_passwd_hash(char data[516], const char *passwd, uchar old_pw_hash[16], BOOL unicode)
 159 {
 160         int new_pw_len = strlen(passwd) * (unicode ? 2 : 1);
 161
 162         if (new_pw_len > 512)
 163         {
 164                 DEBUG(0,("make_oem_passwd_hash: new password is too long.\n"));
 165                 return False;
 166         }
 167
 168         /*
 169          * Now setup the data area.
 170          * We need to generate a random fill
 171          * for this area to make it harder to
 172          * decrypt. JRA.
 173          */
 174         generate_random_buffer((unsigned char *)data, 516, False);
 175         if (unicode)
 176         {
 177                 /* Note that passwd should be in DOS oem character set. */
 178                 dos_struni2( &data[512 - new_pw_len], passwd, 512);
 179         }
 180         else
 181         {
 182                 /* Note that passwd should be in DOS oem character set. */
 183                 fstrcpy( &data[512 - new_pw_len], passwd);
 184         }
 185         SIVAL(data, 512, new_pw_len);
 186
 187 #ifdef DEBUG_PASSWORD
 188         DEBUG(100,("make_oem_passwd_hash\n"));
 189         dump_data(100, data, 516);
 190 #endif
 191         SamOEMhash( (unsigned char *)data, (unsigned char *)old_pw_hash, 516);
 192
 193         return True;
 194 }
 195
 196 /***********************************************************
 197  Encode a password buffer.
 198 ************************************************************/
 199
 200 BOOL encode_pw_buffer(char buffer[516], const char *new_pass,
 201                         int new_pw_len, BOOL nt_pass_set)
 202 {
 203         generate_random_buffer((unsigned char *)buffer, 516, True);
 204
 205         if (new_pw_len < 0 || new_pw_len > 512)
 206                 return False;
 207
 208         if (nt_pass_set) {
 209                 new_pw_len *= 2;
 210                 dos_struni2(&buffer[512 - new_pw_len], new_pass, 256);
 211         } else {
 212                 memcpy(&buffer[512 - new_pw_len], new_pass, new_pw_len);
 213         }
 214
 215         /*
 216          * The length of the new password is in the last 4 bytes of
 217          * the data buffer.
 218          */
 219         SIVAL(buffer, 512, new_pw_len);
 220
 221         return True;
 222 }
 223
 224 /***********************************************************
 225  decode a password buffer
 226 ************************************************************/
 227 BOOL decode_pw_buffer(char in_buffer[516], char *new_pwrd,
 228                       int new_pwrd_size, uint32 *new_pw_len,
 229                       uchar nt_p16[16], uchar p16[16])
 230 {
 231         char *pw;
 232
 233         int uni_pw_len=0;
 234         int byte_len=0;
 235         char unicode_passwd[514];
 236         char lm_ascii_passwd[514];
 237         char passwd[514];
 238
 239         /*
 240           Warning !!! : This function is called from some rpc call.
 241           The password IN the buffer is a UNICODE string.
 242           The password IN new_pwrd is an ASCII string
 243           If you reuse that code somewhere else check first.
 244         */
 245
 246         ZERO_STRUCT(unicode_passwd);
 247         ZERO_STRUCT(lm_ascii_passwd);
 248         ZERO_STRUCT(passwd);
 249
 250         memset(nt_p16, '\0', 16);
 251         memset(p16, '\0', 16);
 252
 253         /* The length of the new password is in the last 4 bytes of the data buffer. */
 254
 255         byte_len = IVAL(in_buffer, 512);
 256
 257 #ifdef DEBUG_PASSWORD
 258         dump_data(100, in_buffer, 516);
 259 #endif
 260
 261         /* Password cannot be longer than 128 characters */
 262         if ( (byte_len < 0) || (byte_len > new_pwrd_size - 1)) {
 263                 DEBUG(0, ("decode_pw_buffer: incorrect password length (%d).\n", byte_len));
 264                 return False;
 265         }
 266
 267         uni_pw_len = byte_len/2;
 268         pw = dos_unistrn2((uint16 *)(&in_buffer[512 - byte_len]), byte_len);
 269         memcpy(passwd, pw, uni_pw_len);
 270
 271 #ifdef DEBUG_PASSWORD
 272         DEBUG(100,("nt_lm_owf_gen: passwd: "));
 273         dump_data(100, (char *)passwd, uni_pw_len);
 274         DEBUG(100,("len:%d\n", uni_pw_len));
 275 #endif
 276         memcpy(unicode_passwd, &in_buffer[512 - byte_len], byte_len);
 277
 278         mdfour(nt_p16, (unsigned char *)unicode_passwd, byte_len);
 279
 280 #ifdef DEBUG_PASSWORD
 281         DEBUG(100,("nt_lm_owf_gen: nt#:"));
 282         dump_data(100, (char *)nt_p16, 16);
 283         DEBUG(100,("\n"));
 284 #endif
 285
 286         /* Mangle the passwords into Lanman format */
 287         memcpy(lm_ascii_passwd, passwd, uni_pw_len);
 288         lm_ascii_passwd[14] = '\0';
 289         strupper(lm_ascii_passwd);
 290
 291         /* Calculate the SMB (lanman) hash functions of the password */
 292         E_P16((uchar *) lm_ascii_passwd, (uchar *)p16);
 293
 294 #ifdef DEBUG_PASSWORD
 295         DEBUG(100,("nt_lm_owf_gen: lm#:"));
 296         dump_data(100, (char *)p16, 16);
 297         DEBUG(100,("\n"));
 298 #endif
 299
 300         /* copy the password and it's length to the return buffer */
 301         *new_pw_len=uni_pw_len;
 302         memcpy(new_pwrd, passwd, uni_pw_len);
 303         new_pwrd[uni_pw_len]='\0';
 304
 305
 306         /* clear out local copy of user's password (just being paranoid). */
 307         ZERO_STRUCT(unicode_passwd);
 308         ZERO_STRUCT(lm_ascii_passwd);
 309         ZERO_STRUCT(passwd);
 310
 311         return True;
 312
 313 }
 314
 315 /* Calculate the NT owfs of a user's password */
 316 void nt_owf_genW(const UNISTR2 *pwd, uchar nt_p16[16])
 317 {
 318         char buf[512];
 319         int i;
 320
 321         for (i = 0; i < MIN(pwd->uni_str_len, sizeof(buf) / 2); i++)
 322         SIVAL(buf, i * 2, pwd->buffer[i]);
 323
 324         /* Calculate the MD4 hash (NT compatible) of the password */
 325         mdfour(nt_p16, (unsigned char *)buf, pwd->uni_str_len * 2);
 326
 327         /* clear out local copy of user's password (just being paranoid). */
 328         ZERO_STRUCT(buf);
 329 }