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    Copyright (C) Jeremy Allison 1995-2000.
   8    Copyright (C) Luke Kennethc Casson Leighton 1996-2000.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 #include "includes.h"
  26 #include "byteorder.h"
  27
  28 /*
  29    This implements the X/Open SMB password encryption
  30    It takes a password, a 8 byte "crypt key" and puts 24 bytes of
  31    encrypted password into p24 */
  32 void SMBencrypt(const uchar *passwd, const uchar *c8, uchar *p24)
  33 {
  34         uchar p14[15], p21[21];
  35
  36         memset(p21,'\0',21);
  37         memset(p14,'\0',14);
  38         StrnCpy((char *)p14,(const char *)passwd,14);
  39
  40         strupper((char *)p14);
  41         E_P16(p14, p21);
  42
  43         SMBOWFencrypt(p21, c8, p24);
  44
  45 #ifdef DEBUG_PASSWORD
  46         DEBUG(100,("SMBencrypt: lm#, challenge, response\n"));
  47         dump_data(100, (char *)p21, 16);
  48         dump_data(100, (const char *)c8, 8);
  49         dump_data(100, (char *)p24, 24);
  50 #endif
  51 }
  52
  53 /*
  54  * Creates the MD4 Hash of the users password in NT UNICODE.
  55  */
  56
  57 void E_md4hash(const uchar *passwd, uchar *p16)
  58 {
  59         int len;
  60         smb_ucs2_t wpwd[129];
  61
  62         /* Password cannot be longer than 128 characters */
  63         len = strlen((const char *)passwd);
  64         if(len > 128)
  65                 len = 128;
  66         /* Password must be converted to NT unicode - null terminated. */
  67         push_ucs2(NULL, wpwd, (const char *)passwd, 256, STR_UNICODE|STR_NOALIGN|STR_TERMINATE);
  68         /* Calculate length in bytes */
  69         len = strlen_w(wpwd) * sizeof(int16);
  70
  71         mdfour(p16, (unsigned char *)wpwd, len);
  72 }
  73
  74 /* Does both the NT and LM owfs of a user's password */
  75 void nt_lm_owf_gen(const char *pwd, uchar nt_p16[16], uchar p16[16])
  76 {
  77         char passwd[514];
  78
  79         memset(passwd,'\0',514);
  80         safe_strcpy( passwd, pwd, sizeof(passwd)-1);
  81
  82         /* Calculate the MD4 hash (NT compatible) of the password */
  83         memset(nt_p16, '\0', 16);
  84         E_md4hash((uchar *)passwd, nt_p16);
  85
  86 #ifdef DEBUG_PASSWORD
  87         DEBUG(100,("nt_lm_owf_gen: pwd, nt#\n"));
  88         dump_data(120, passwd, strlen(passwd));
  89         dump_data(100, (char *)nt_p16, 16);
  90 #endif
  91
  92         /* Mangle the passwords into Lanman format */
  93         passwd[14] = '\0';
  94         strupper(passwd);
  95
  96         /* Calculate the SMB (lanman) hash functions of the password */
  97
  98         memset(p16, '\0', 16);
  99         E_P16((uchar *) passwd, (uchar *)p16);
 100
 101 #ifdef DEBUG_PASSWORD
 102         DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n"));
 103         dump_data(120, passwd, strlen(passwd));
 104         dump_data(100, (char *)p16, 16);
 105 #endif
 106         /* clear out local copy of user's password (just being paranoid). */
 107         memset(passwd, '\0', sizeof(passwd));
 108 }
 109
 110 /* Does both the NTLMv2 owfs of a user's password */
 111 void ntv2_owf_gen(const uchar owf[16],
 112                   const char *user_n, const char *domain_n, uchar kr_buf[16])
 113 {
 114         pstring user_u;
 115         pstring dom_u;
 116         HMACMD5Context ctx;
 117
 118         int user_l = strlen(user_n);
 119         int domain_l = strlen(domain_n);
 120
 121         push_ucs2(NULL, user_u, user_n, (user_l+1)*2, STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER);
 122         push_ucs2(NULL, dom_u, domain_n, (domain_l+1)*2, STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER);
 123
 124         hmac_md5_init_limK_to_64(owf, 16, &ctx);
 125         hmac_md5_update((const unsigned char *)user_u, user_l * 2, &ctx);
 126         hmac_md5_update((const unsigned char *)dom_u, domain_l * 2, &ctx);
 127         hmac_md5_final(kr_buf, &ctx);
 128
 129 #ifdef DEBUG_PASSWORD
 130         DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n"));
 131         dump_data(100, user_u, user_l * 2);
 132         dump_data(100, dom_u, domain_l * 2);
 133         dump_data(100, owf, 16);
 134         dump_data(100, kr_buf, 16);
 135 #endif
 136 }
 137
 138 /* Does the des encryption from the NT or LM MD4 hash. */
 139 void SMBOWFencrypt(const uchar passwd[16], const uchar *c8, uchar p24[24])
 140 {
 141         uchar p21[21];
 142
 143         memset(p21,'\0',21);
 144
 145         memcpy(p21, passwd, 16);
 146         E_P24(p21, c8, p24);
 147 }
 148
 149 /* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
 150 void NTLMSSPOWFencrypt(const uchar passwd[8], const uchar *ntlmchalresp, uchar p24[24])
 151 {
 152         uchar p21[21];
 153
 154         memset(p21,'\0',21);
 155         memcpy(p21, passwd, 8);
 156         memset(p21 + 8, 0xbd, 8);
 157
 158         E_P24(p21, ntlmchalresp, p24);
 159 #ifdef DEBUG_PASSWORD
 160         DEBUG(100,("NTLMSSPOWFencrypt: p21, c8, p24\n"));
 161         dump_data(100, (char *)p21, 21);
 162         dump_data(100, (const char *)ntlmchalresp, 8);
 163         dump_data(100, (char *)p24, 24);
 164 #endif
 165 }
 166
 167
 168 /* Does the NT MD4 hash then des encryption. */
 169
 170 void SMBNTencrypt(const uchar *passwd, uchar *c8, uchar *p24)
 171 {
 172         uchar p21[21];
 173
 174         memset(p21,'\0',21);
 175
 176         E_md4hash(passwd, p21);
 177         SMBOWFencrypt(p21, c8, p24);
 178
 179 #ifdef DEBUG_PASSWORD
 180         DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
 181         dump_data(100, (char *)p21, 16);
 182         dump_data(100, (char *)c8, 8);
 183         dump_data(100, (char *)p24, 24);
 184 #endif
 185 }
 186
 187 BOOL make_oem_passwd_hash(char data[516], const char *passwd, uchar old_pw_hash[16], BOOL unicode)
 188 {
 189         int new_pw_len = strlen(passwd) * (unicode ? 2 : 1);
 190
 191         if (new_pw_len > 512)
 192         {
 193                 DEBUG(0,("make_oem_passwd_hash: new password is too long.\n"));
 194                 return False;
 195         }
 196
 197         /*
 198          * Now setup the data area.
 199          * We need to generate a random fill
 200          * for this area to make it harder to
 201          * decrypt. JRA.
 202          */
 203         generate_random_buffer((unsigned char *)data, 516, False);
 204         push_string(NULL, &data[512 - new_pw_len], passwd, new_pw_len,
 205                     STR_NOALIGN | (unicode?STR_UNICODE:STR_ASCII));
 206         SIVAL(data, 512, new_pw_len);
 207
 208 #ifdef DEBUG_PASSWORD
 209         DEBUG(100,("make_oem_passwd_hash\n"));
 210         dump_data(100, data, 516);
 211 #endif
 212         SamOEMhash( (unsigned char *)data, (unsigned char *)old_pw_hash, 516);
 213
 214         return True;
 215 }
 216
 217 /* Does the md5 encryption from the NT hash for NTLMv2. */
 218 void SMBOWFencrypt_ntv2(const uchar kr[16],
 219                         const DATA_BLOB srv_chal,
 220                         const DATA_BLOB cli_chal,
 221                         char resp_buf[16])
 222 {
 223         HMACMD5Context ctx;
 224
 225         hmac_md5_init_limK_to_64(kr, 16, &ctx);
 226         hmac_md5_update(srv_chal.data, srv_chal.length, &ctx);
 227         hmac_md5_update(cli_chal.data, cli_chal.length, &ctx);
 228         hmac_md5_final((unsigned char *)resp_buf, &ctx);
 229
 230 #ifdef DEBUG_PASSWORD
 231         DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, cli_chal, resp_buf\n"));
 232         dump_data(100, srv_chal.data, srv_chal.length);
 233         dump_data(100, cli_chal.data, cli_chal.length);
 234         dump_data(100, resp_buf, 16);
 235 #endif
 236 }
 237
 238 void SMBsesskeygen_ntv2(const uchar kr[16],
 239                         const uchar * nt_resp, uint8 sess_key[16])
 240 {
 241         HMACMD5Context ctx;
 242
 243         hmac_md5_init_limK_to_64(kr, 16, &ctx);
 244         hmac_md5_update(nt_resp, 16, &ctx);
 245         hmac_md5_final((unsigned char *)sess_key, &ctx);
 246
 247 #ifdef DEBUG_PASSWORD
 248         DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
 249         dump_data(100, sess_key, 16);
 250 #endif
 251 }
 252
 253 void SMBsesskeygen_ntv1(const uchar kr[16],
 254                         const uchar * nt_resp, uint8 sess_key[16])
 255 {
 256         mdfour((unsigned char *)sess_key, kr, 16);
 257
 258 #ifdef DEBUG_PASSWORD
 259         DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
 260         dump_data(100, sess_key, 16);
 261 #endif
 262 }
 263
 264 /***********************************************************
 265  encode a password buffer.  The caller gets to figure out
 266  what to put in it.
 267 ************************************************************/
 268 BOOL encode_pw_buffer(char buffer[516], char *new_pw, int new_pw_length)
 269 {
 270         generate_random_buffer((unsigned char *)buffer, 516, True);
 271
 272         memcpy(&buffer[512 - new_pw_length], new_pw, new_pw_length);
 273
 274         /*
 275          * The length of the new password is in the last 4 bytes of
 276          * the data buffer.
 277          */
 278         SIVAL(buffer, 512, new_pw_length);
 279
 280         return True;
 281 }
 282
 283 /***********************************************************
 284  decode a password buffer
 285  *new_pw_len is the length in bytes of the possibly mulitbyte
 286  returned password including termination.
 287 ************************************************************/
 288 BOOL decode_pw_buffer(char in_buffer[516], char *new_pwrd,
 289                       int new_pwrd_size, uint32 *new_pw_len)
 290 {
 291         int byte_len=0;
 292
 293         /*
 294           Warning !!! : This function is called from some rpc call.
 295           The password IN the buffer is a UNICODE string.
 296           The password IN new_pwrd is an ASCII string
 297           If you reuse that code somewhere else check first.
 298         */
 299
 300         /* The length of the new password is in the last 4 bytes of the data buffer. */
 301
 302         byte_len = IVAL(in_buffer, 512);
 303
 304 #ifdef DEBUG_PASSWORD
 305         dump_data(100, in_buffer, 516);
 306 #endif
 307
 308         /* Password cannot be longer than 128 characters */
 309         if ( (byte_len < 0) || (byte_len > new_pwrd_size - 1)) {
 310                 DEBUG(0, ("decode_pw_buffer: incorrect password length (%d).\n", byte_len));
 311                 DEBUG(0, ("decode_pw_buffer: check that 'encrypt passwords = yes'\n"));
 312                 return False;
 313         }
 314
 315         /* decode into the return buffer.  Buffer must be a pstring */
 316         *new_pw_len = pull_string(NULL, new_pwrd, &in_buffer[512 - byte_len], new_pwrd_size, byte_len, STR_UNICODE);
 317
 318 #ifdef DEBUG_PASSWORD
 319         DEBUG(100,("decode_pw_buffer: new_pwrd: "));
 320         dump_data(100, (char *)new_pwrd, *new_pw_len);
 321         DEBUG(100,("multibyte len:%d\n", *new_pw_len));
 322         DEBUG(100,("original char len:%d\n", byte_len/2));
 323 #endif
 324
 325         return True;
 326
 327 }
 328
 329 /* Calculate the NT owfs of a user's password */
 330 void nt_owf_genW(const UNISTR2 *pwd, uchar nt_p16[16])
 331 {
 332         char buf[512];
 333         int i;
 334
 335         for (i = 0; i < MIN(pwd->uni_str_len, sizeof(buf) / 2); i++)
 336         {
 337                 SIVAL(buf, i * 2, pwd->buffer[i]);
 338         }
 339         /* Calculate the MD4 hash (NT compatible) of the password */
 340         mdfour(nt_p16, (const unsigned char *)buf, pwd->uni_str_len * 2);
 341
 342         /* clear out local copy of user's password (just being paranoid). */
 343         ZERO_STRUCT(buf);
 344 }