source/libsmb/smbencrypt.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB parameters and setup
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Modified by Jeremy Allison 1995.
   6    Copyright (C) Jeremy Allison 1995-2000.
   7    Copyright (C) Luke Kennethc Casson Leighton 1996-2000.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25 #include "byteorder.h"
  26
  27 /*
  28    This implements the X/Open SMB password encryption
  29    It takes a password ('unix' string), a 8 byte "crypt key"
  30    and puts 24 bytes of encrypted password into p24 */
  31 void SMBencrypt(const char *passwd, const uchar *c8, uchar p24[24])
  32 {
  33         uchar p21[21];
  34
  35         memset(p21,'\0',21);
  36         E_deshash(passwd, p21);
  37
  38         SMBOWFencrypt(p21, c8, p24);
  39
  40 #ifdef DEBUG_PASSWORD
  41         DEBUG(100,("SMBencrypt: lm#, challenge, response\n"));
  42         dump_data(100, (char *)p21, 16);
  43         dump_data(100, (const char *)c8, 8);
  44         dump_data(100, (char *)p24, 24);
  45 #endif
  46 }
  47
  48 /**
  49  * Creates the MD4 Hash of the users password in NT UNICODE.
  50  * @param passwd password in 'unix' charset.
  51  * @param p16 return password hashed with md4, caller allocated 16 byte buffer
  52  */
  53
  54 void E_md4hash(const char *passwd, uchar p16[16])
  55 {
  56         int len;
  57         smb_ucs2_t wpwd[129];
  58
  59         /* Password must be converted to NT unicode - null terminated. */
  60         push_ucs2(NULL, wpwd, (const char *)passwd, 256, STR_UNICODE|STR_NOALIGN|STR_TERMINATE);
  61         /* Calculate length in bytes */
  62         len = strlen_w(wpwd) * sizeof(int16);
  63
  64         mdfour(p16, (unsigned char *)wpwd, len);
  65         ZERO_STRUCT(wpwd);
  66 }
  67
  68 /**
  69  * Creates the DES forward-only Hash of the users password in DOS ASCII charset
  70  * @param passwd password in 'unix' charset.
  71  * @param p16 return password hashed with DES, caller allocated 16 byte buffer
  72  */
  73
  74 void E_deshash(const char *passwd, uchar p16[16])
  75 {
  76         uchar dospwd[15]; /* Password must not be > 14 chars long. */
  77         ZERO_STRUCT(dospwd);
  78         ZERO_STRUCTP(p16);
  79
  80         /* Password must be converted to DOS charset - null terminated, uppercase. */
  81         push_ascii(dospwd, (const char *)passwd, sizeof(dospwd), STR_UPPER|STR_TERMINATE);
  82
  83         E_P16(dospwd, p16);
  84
  85         ZERO_STRUCT(dospwd);
  86 }
  87
  88 /**
  89  * Creates the MD4 and DES (LM) Hash of the users password.
  90  * MD4 is of the NT Unicode, DES is of the DOS UPPERCASE password.
  91  * @param passwd password in 'unix' charset.
  92  * @param nt_p16 return password hashed with md4, caller allocated 16 byte buffer
  93  * @param p16 return password hashed with des, caller allocated 16 byte buffer
  94  */
  95
  96 /* Does both the NT and LM owfs of a user's password */
  97 void nt_lm_owf_gen(const char *pwd, uchar nt_p16[16], uchar p16[16])
  98 {
  99         /* Calculate the MD4 hash (NT compatible) of the password */
 100         memset(nt_p16, '\0', 16);
 101         E_md4hash(pwd, nt_p16);
 102
 103 #ifdef DEBUG_PASSWORD
 104         DEBUG(100,("nt_lm_owf_gen: pwd, nt#\n"));
 105         dump_data(120, pwd, strlen(pwd));
 106         dump_data(100, (char *)nt_p16, 16);
 107 #endif
 108
 109         E_deshash(pwd, (uchar *)p16);
 110
 111 #ifdef DEBUG_PASSWORD
 112         DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n"));
 113         dump_data(120, pwd, strlen(pwd));
 114         dump_data(100, (char *)p16, 16);
 115 #endif
 116 }
 117
 118 /* Does both the NTLMv2 owfs of a user's password */
 119 void ntv2_owf_gen(const uchar owf[16],
 120                   const char *user_n, const char *domain_n, uchar kr_buf[16])
 121 {
 122         pstring user_u;
 123         pstring dom_u;
 124         HMACMD5Context ctx;
 125
 126         int user_l = strlen(user_n);
 127         int domain_l = strlen(domain_n);
 128
 129         push_ucs2(NULL, user_u, user_n, (user_l+1)*2, STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER);
 130         push_ucs2(NULL, dom_u, domain_n, (domain_l+1)*2, STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER);
 131
 132         hmac_md5_init_limK_to_64(owf, 16, &ctx);
 133         hmac_md5_update((const unsigned char *)user_u, user_l * 2, &ctx);
 134         hmac_md5_update((const unsigned char *)dom_u, domain_l * 2, &ctx);
 135         hmac_md5_final(kr_buf, &ctx);
 136
 137 #ifdef DEBUG_PASSWORD
 138         DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n"));
 139         dump_data(100, user_u, user_l * 2);
 140         dump_data(100, dom_u, domain_l * 2);
 141         dump_data(100, owf, 16);
 142         dump_data(100, kr_buf, 16);
 143 #endif
 144 }
 145
 146 /* Does the des encryption from the NT or LM MD4 hash. */
 147 void SMBOWFencrypt(const uchar passwd[16], const uchar *c8, uchar p24[24])
 148 {
 149         uchar p21[21];
 150
 151         memset(p21,'\0',21);
 152
 153         memcpy(p21, passwd, 16);
 154         E_P24(p21, c8, p24);
 155 }
 156
 157 /* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
 158 void NTLMSSPOWFencrypt(const uchar passwd[8], const uchar *ntlmchalresp, uchar p24[24])
 159 {
 160         uchar p21[21];
 161
 162         memset(p21,'\0',21);
 163         memcpy(p21, passwd, 8);
 164         memset(p21 + 8, 0xbd, 8);
 165
 166         E_P24(p21, ntlmchalresp, p24);
 167 #ifdef DEBUG_PASSWORD
 168         DEBUG(100,("NTLMSSPOWFencrypt: p21, c8, p24\n"));
 169         dump_data(100, (char *)p21, 21);
 170         dump_data(100, (const char *)ntlmchalresp, 8);
 171         dump_data(100, (char *)p24, 24);
 172 #endif
 173 }
 174
 175
 176 /* Does the NT MD4 hash then des encryption. */
 177
 178 void SMBNTencrypt(const char *passwd, uchar *c8, uchar *p24)
 179 {
 180         uchar p21[21];
 181
 182         memset(p21,'\0',21);
 183
 184         E_md4hash(passwd, p21);
 185         SMBOWFencrypt(p21, c8, p24);
 186
 187 #ifdef DEBUG_PASSWORD
 188         DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
 189         dump_data(100, (char *)p21, 16);
 190         dump_data(100, (char *)c8, 8);
 191         dump_data(100, (char *)p24, 24);
 192 #endif
 193 }
 194
 195 BOOL make_oem_passwd_hash(char data[516], const char *passwd, uchar old_pw_hash[16], BOOL unicode)
 196 {
 197         int new_pw_len = strlen(passwd) * (unicode ? 2 : 1);
 198
 199         if (new_pw_len > 512)
 200         {
 201                 DEBUG(0,("make_oem_passwd_hash: new password is too long.\n"));
 202                 return False;
 203         }
 204
 205         /*
 206          * Now setup the data area.
 207          * We need to generate a random fill
 208          * for this area to make it harder to
 209          * decrypt. JRA.
 210          */
 211         generate_random_buffer((unsigned char *)data, 516, False);
 212         push_string(NULL, &data[512 - new_pw_len], passwd, new_pw_len,
 213                     STR_NOALIGN | (unicode?STR_UNICODE:STR_ASCII));
 214         SIVAL(data, 512, new_pw_len);
 215
 216 #ifdef DEBUG_PASSWORD
 217         DEBUG(100,("make_oem_passwd_hash\n"));
 218         dump_data(100, data, 516);
 219 #endif
 220         SamOEMhash( (unsigned char *)data, (unsigned char *)old_pw_hash, 516);
 221
 222         return True;
 223 }
 224
 225 /* Does the md5 encryption from the NT hash for NTLMv2. */
 226 void SMBOWFencrypt_ntv2(const uchar kr[16],
 227                         const DATA_BLOB srv_chal,
 228                         const DATA_BLOB cli_chal,
 229                         uchar resp_buf[16])
 230 {
 231         HMACMD5Context ctx;
 232
 233         hmac_md5_init_limK_to_64(kr, 16, &ctx);
 234         hmac_md5_update(srv_chal.data, srv_chal.length, &ctx);
 235         hmac_md5_update(cli_chal.data, cli_chal.length, &ctx);
 236         hmac_md5_final(resp_buf, &ctx);
 237
 238 #ifdef DEBUG_PASSWORD
 239         DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, cli_chal, resp_buf\n"));
 240         dump_data(100, srv_chal.data, srv_chal.length);
 241         dump_data(100, cli_chal.data, cli_chal.length);
 242         dump_data(100, resp_buf, 16);
 243 #endif
 244 }
 245
 246 void SMBsesskeygen_ntv2(const uchar kr[16],
 247                         const uchar * nt_resp, uint8 sess_key[16])
 248 {
 249         HMACMD5Context ctx;
 250
 251         hmac_md5_init_limK_to_64(kr, 16, &ctx);
 252         hmac_md5_update(nt_resp, 16, &ctx);
 253         hmac_md5_final((unsigned char *)sess_key, &ctx);
 254
 255 #ifdef DEBUG_PASSWORD
 256         DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
 257         dump_data(100, sess_key, 16);
 258 #endif
 259 }
 260
 261 void SMBsesskeygen_ntv1(const uchar kr[16],
 262                         const uchar * nt_resp, uint8 sess_key[16])
 263 {
 264         mdfour((unsigned char *)sess_key, kr, 16);
 265
 266 #ifdef DEBUG_PASSWORD
 267         DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
 268         dump_data(100, sess_key, 16);
 269 #endif
 270 }
 271
 272 /***********************************************************
 273  encode a password buffer.  The caller gets to figure out
 274  what to put in it.
 275 ************************************************************/
 276 BOOL encode_pw_buffer(char buffer[516], char *new_pw, int new_pw_length)
 277 {
 278         generate_random_buffer((unsigned char *)buffer, 516, True);
 279
 280         memcpy(&buffer[512 - new_pw_length], new_pw, new_pw_length);
 281
 282         /*
 283          * The length of the new password is in the last 4 bytes of
 284          * the data buffer.
 285          */
 286         SIVAL(buffer, 512, new_pw_length);
 287
 288         return True;
 289 }
 290
 291 /***********************************************************
 292  decode a password buffer
 293  *new_pw_len is the length in bytes of the possibly mulitbyte
 294  returned password including termination.
 295 ************************************************************/
 296 BOOL decode_pw_buffer(char in_buffer[516], char *new_pwrd,
 297                       int new_pwrd_size, uint32 *new_pw_len)
 298 {
 299         int byte_len=0;
 300
 301         /*
 302           Warning !!! : This function is called from some rpc call.
 303           The password IN the buffer is a UNICODE string.
 304           The password IN new_pwrd is an ASCII string
 305           If you reuse that code somewhere else check first.
 306         */
 307
 308         /* The length of the new password is in the last 4 bytes of the data buffer. */
 309
 310         byte_len = IVAL(in_buffer, 512);
 311
 312 #ifdef DEBUG_PASSWORD
 313         dump_data(100, in_buffer, 516);
 314 #endif
 315
 316         /* Password cannot be longer than 128 characters */
 317         if ( (byte_len < 0) || (byte_len > new_pwrd_size - 1)) {
 318                 DEBUG(0, ("decode_pw_buffer: incorrect password length (%d).\n", byte_len));
 319                 DEBUG(0, ("decode_pw_buffer: check that 'encrypt passwords = yes'\n"));
 320                 return False;
 321         }
 322
 323         /* decode into the return buffer.  Buffer must be a pstring */
 324         *new_pw_len = pull_string(NULL, new_pwrd, &in_buffer[512 - byte_len], new_pwrd_size, byte_len, STR_UNICODE);
 325
 326 #ifdef DEBUG_PASSWORD
 327         DEBUG(100,("decode_pw_buffer: new_pwrd: "));
 328         dump_data(100, (char *)new_pwrd, *new_pw_len);
 329         DEBUG(100,("multibyte len:%d\n", *new_pw_len));
 330         DEBUG(100,("original char len:%d\n", byte_len/2));
 331 #endif
 332
 333         return True;
 334 }
 335
 336 /***********************************************************
 337  SMB signing - setup the MAC key.
 338 ************************************************************/
 339
 340 void cli_calculate_mac_key(struct cli_state *cli, const char *ntpasswd, const uchar resp[24])
 341 {
 342         /* Get first 16 bytes. */
 343         E_md4hash(ntpasswd,&cli->sign_info.mac_key[0]);
 344         memcpy(&cli->sign_info.mac_key[16],resp,24);
 345         cli->sign_info.mac_key_len = 40;
 346         cli->sign_info.use_smb_signing = True;
 347
 348         /* These calls are INCONPATIBLE with SMB signing */
 349         cli->readbraw_supported = False;
 350         cli->writebraw_supported = False;
 351
 352         /* Reset the sequence number in case we had a previous (aborted) attempt */
 353         cli->sign_info.send_seq_num = 0;
 354 }
 355
 356 /***********************************************************
 357  SMB signing - calculate a MAC to send.
 358 ************************************************************/
 359
 360 void cli_caclulate_sign_mac(struct cli_state *cli)
 361 {
 362         unsigned char calc_md5_mac[16];
 363         struct MD5Context md5_ctx;
 364
 365         if (!cli->sign_info.use_smb_signing) {
 366                 return;
 367         }
 368
 369         /*
 370          * Firstly put the sequence number into the first 4 bytes.
 371          * and zero out the next 4 bytes.
 372          */
 373         SIVAL(cli->outbuf, smb_ss_field, cli->sign_info.send_seq_num);
 374         SIVAL(cli->outbuf, smb_ss_field + 4, 0);
 375
 376         /* Calculate the 16 byte MAC and place first 8 bytes into the field. */
 377         MD5Init(&md5_ctx);
 378         MD5Update(&md5_ctx, cli->sign_info.mac_key, cli->sign_info.mac_key_len);
 379         MD5Update(&md5_ctx, cli->outbuf + 4, smb_len(cli->outbuf));
 380         MD5Final(calc_md5_mac, &md5_ctx);
 381
 382         memcpy(&cli->outbuf[smb_ss_field], calc_md5_mac, 8);
 383         cli->sign_info.send_seq_num++;
 384         cli->sign_info.reply_seq_num = cli->sign_info.send_seq_num;
 385         cli->sign_info.send_seq_num++;
 386 }