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         /* Password must be converted to NT unicode - null terminated. */
  63         dos_struni2((char *)wpwd, (const char *)passwd, sizeof(wpwd));
  64         /* Calculate length in bytes */
  65         len = strlen_w((const smb_ucs2_t *)wpwd) * sizeof(smb_ucs2_t);
  66
  67         mdfour(p16, (unsigned char *)wpwd, len);
  68 }
  69
  70 /* Does both the NT and LM owfs of a user's password */
  71 void nt_lm_owf_gen(char *pwd, uchar nt_p16[16], uchar p16[16])
  72 {
  73         char passwd[514];
  74
  75         memset(passwd,'\0',514);
  76         safe_strcpy( passwd, pwd, sizeof(passwd)-1);
  77
  78         /* Calculate the MD4 hash (NT compatible) of the password */
  79         memset(nt_p16, '\0', 16);
  80         E_md4hash((uchar *)passwd, nt_p16);
  81
  82 #ifdef DEBUG_PASSWORD
  83         DEBUG(100,("nt_lm_owf_gen: pwd, nt#\n"));
  84         dump_data(120, passwd, strlen(passwd));
  85         dump_data(100, (char *)nt_p16, 16);
  86 #endif
  87
  88         /* Mangle the passwords into Lanman format */
  89         passwd[14] = '\0';
  90         strupper(passwd);
  91
  92         /* Calculate the SMB (lanman) hash functions of the password */
  93
  94         memset(p16, '\0', 16);
  95         E_P16((uchar *) passwd, (uchar *)p16);
  96
  97 #ifdef DEBUG_PASSWORD
  98         DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n"));
  99         dump_data(120, passwd, strlen(passwd));
 100         dump_data(100, (char *)p16, 16);
 101 #endif
 102         /* clear out local copy of user's password (just being paranoid). */
 103         memset(passwd, '\0', sizeof(passwd));
 104 }
 105
 106 /* Does the des encryption from the NT or LM MD4 hash. */
 107 void SMBOWFencrypt(uchar passwd[16], uchar *c8, uchar p24[24])
 108 {
 109         uchar p21[21];
 110
 111         memset(p21,'\0',21);
 112
 113         memcpy(p21, passwd, 16);
 114         E_P24(p21, c8, p24);
 115 }
 116
 117 /* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
 118 void NTLMSSPOWFencrypt(uchar passwd[8], uchar *ntlmchalresp, uchar p24[24])
 119 {
 120         uchar p21[21];
 121
 122         memset(p21,'\0',21);
 123         memcpy(p21, passwd, 8);
 124         memset(p21 + 8, 0xbd, 8);
 125
 126         E_P24(p21, ntlmchalresp, p24);
 127 #ifdef DEBUG_PASSWORD
 128         DEBUG(100,("NTLMSSPOWFencrypt: p21, c8, p24\n"));
 129         dump_data(100, (char *)p21, 21);
 130         dump_data(100, (char *)ntlmchalresp, 8);
 131         dump_data(100, (char *)p24, 24);
 132 #endif
 133 }
 134
 135
 136 /* Does the NT MD4 hash then des encryption. */
 137
 138 void SMBNTencrypt(const uchar *passwd, uchar *c8, uchar *p24)
 139 {
 140         uchar p21[21];
 141
 142         memset(p21,'\0',21);
 143
 144         E_md4hash(passwd, p21);
 145         SMBOWFencrypt(p21, c8, p24);
 146
 147 #ifdef DEBUG_PASSWORD
 148         DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
 149         dump_data(100, (char *)p21, 16);
 150         dump_data(100, (char *)c8, 8);
 151         dump_data(100, (char *)p24, 24);
 152 #endif
 153 }
 154
 155 BOOL make_oem_passwd_hash(char data[516], const char *passwd, uchar old_pw_hash[16], BOOL unicode)
 156 {
 157         int new_pw_len = strlen(passwd) * (unicode ? 2 : 1);
 158
 159         if (new_pw_len > 512)
 160         {
 161                 DEBUG(0,("make_oem_passwd_hash: new password is too long.\n"));
 162                 return False;
 163         }
 164
 165         /*
 166          * Now setup the data area.
 167          * We need to generate a random fill
 168          * for this area to make it harder to
 169          * decrypt. JRA.
 170          */
 171         generate_random_buffer((unsigned char *)data, 516, False);
 172         if (unicode)
 173         {
 174                 /* Note that passwd should be in DOS oem character set. */
 175                 dos_struni2( &data[512 - new_pw_len], passwd, 512);
 176         }
 177         else
 178         {
 179                 /* Note that passwd should be in DOS oem character set. */
 180                 fstrcpy( &data[512 - new_pw_len], passwd);
 181         }
 182         SIVAL(data, 512, new_pw_len);
 183
 184 #ifdef DEBUG_PASSWORD
 185         DEBUG(100,("make_oem_passwd_hash\n"));
 186         dump_data(100, data, 516);
 187 #endif
 188         SamOEMhash( (unsigned char *)data, (unsigned char *)old_pw_hash, 516);
 189
 190         return True;
 191 }
 192
 193 /***********************************************************
 194  Encode a password buffer.
 195 ************************************************************/
 196
 197 BOOL encode_pw_buffer(char buffer[516], const char *new_pass,
 198                         int new_pw_len, BOOL nt_pass_set)
 199 {
 200         generate_random_buffer((unsigned char *)buffer, 516, True);
 201
 202         if (new_pw_len < 0 || new_pw_len > 512)
 203                 return False;
 204
 205         if (nt_pass_set) {
 206                 new_pw_len *= 2;
 207                 dos_struni2(&buffer[512 - new_pw_len], new_pass, 256);
 208         } else {
 209                 memcpy(&buffer[512 - new_pw_len], new_pass, new_pw_len);
 210         }
 211
 212         /*
 213          * The length of the new password is in the last 4 bytes of
 214          * the data buffer.
 215          */
 216         SIVAL(buffer, 512, new_pw_len);
 217
 218         return True;
 219 }
 220
 221 /***********************************************************
 222  decode a password buffer
 223 ************************************************************/
 224 BOOL decode_pw_buffer(char in_buffer[516], char *new_pwrd,
 225                       int new_pwrd_size, uint32 *new_pw_len,
 226                       uchar nt_p16[16], uchar p16[16])
 227 {
 228         char *pw;
 229
 230         int uni_pw_len=0;
 231         int byte_len=0;
 232         char unicode_passwd[514];
 233         char lm_ascii_passwd[514];
 234         char passwd[514];
 235
 236         /*
 237           Warning !!! : This function is called from some rpc call.
 238           The password IN the buffer is a UNICODE string.
 239           The password IN new_pwrd is an ASCII string
 240           If you reuse that code somewhere else check first.
 241         */
 242
 243         ZERO_STRUCT(unicode_passwd);
 244         ZERO_STRUCT(lm_ascii_passwd);
 245         ZERO_STRUCT(passwd);
 246
 247         memset(nt_p16, '\0', 16);
 248         memset(p16, '\0', 16);
 249
 250         /* The length of the new password is in the last 4 bytes of the data buffer. */
 251
 252         byte_len = IVAL(in_buffer, 512);
 253
 254 #ifdef DEBUG_PASSWORD
 255         dump_data(100, in_buffer, 516);
 256 #endif
 257
 258         /* Password cannot be longer than 128 characters */
 259         if ( (byte_len < 0) || (byte_len > new_pwrd_size - 1)) {
 260                 DEBUG(0, ("decode_pw_buffer: incorrect password length (%d).\n", byte_len));
 261                 return False;
 262         }
 263
 264         uni_pw_len = byte_len/2;
 265         pw = dos_unistrn2((uint16 *)(&in_buffer[512 - byte_len]), uni_pw_len);
 266         memcpy(passwd, pw, uni_pw_len);
 267
 268 #ifdef DEBUG_PASSWORD
 269         DEBUG(100,("nt_lm_owf_gen: passwd: "));
 270         dump_data(100, (char *)passwd, uni_pw_len);
 271         DEBUG(100,("len:%d\n", uni_pw_len));
 272 #endif
 273         memcpy(unicode_passwd, &in_buffer[512 - byte_len], byte_len);
 274
 275         mdfour(nt_p16, (unsigned char *)unicode_passwd, byte_len);
 276
 277 #ifdef DEBUG_PASSWORD
 278         DEBUG(100,("nt_lm_owf_gen: nt#:"));
 279         dump_data(100, (char *)nt_p16, 16);
 280         DEBUG(100,("\n"));
 281 #endif
 282
 283         /* Mangle the passwords into Lanman format */
 284         memcpy(lm_ascii_passwd, passwd, uni_pw_len);
 285         lm_ascii_passwd[14] = '\0';
 286         strupper(lm_ascii_passwd);
 287
 288         /* Calculate the SMB (lanman) hash functions of the password */
 289         E_P16((uchar *) lm_ascii_passwd, (uchar *)p16);
 290
 291 #ifdef DEBUG_PASSWORD
 292         DEBUG(100,("nt_lm_owf_gen: lm#:"));
 293         dump_data(100, (char *)p16, 16);
 294         DEBUG(100,("\n"));
 295 #endif
 296
 297         /* copy the password and it's length to the return buffer */
 298         *new_pw_len=uni_pw_len;
 299         memcpy(new_pwrd, passwd, uni_pw_len);
 300         new_pwrd[uni_pw_len]='\0';
 301
 302
 303         /* clear out local copy of user's password (just being paranoid). */
 304         ZERO_STRUCT(unicode_passwd);
 305         ZERO_STRUCT(lm_ascii_passwd);
 306         ZERO_STRUCT(passwd);
 307
 308         return True;
 309
 310 }
 311
 312 /* Calculate the NT owfs of a user's password */
 313 void nt_owf_genW(const UNISTR2 *pwd, uchar nt_p16[16])
 314 {
 315         char buf[512];
 316         int i;
 317
 318         for (i = 0; i < MIN(pwd->uni_str_len, sizeof(buf) / 2); i++)
 319         SIVAL(buf, i * 2, pwd->buffer[i]);
 320
 321         /* Calculate the MD4 hash (NT compatible) of the password */
 322         mdfour(nt_p16, (unsigned char *)buf, pwd->uni_str_len * 2);
 323
 324         /* clear out local copy of user's password (just being paranoid). */
 325         ZERO_STRUCT(buf);
 326 }