fs/cifs/smbencrypt.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    SMB parameters and setup
   5    Copyright (C) Andrew Tridgell 1992-2000
   6    Copyright (C) Luke Kenneth Casson Leighton 1996-2000
   7    Modified by Jeremy Allison 1995.
   8    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
   9    Modified by Steve French (sfrench@us.ibm.com) 2002-2003
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24 */
  25
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/string.h>
  29 #include <linux/kernel.h>
  30 #include <linux/random.h>
  31 #include "cifs_unicode.h"
  32 #include "cifspdu.h"
  33 #include "cifsglob.h"
  34 #include "md5.h"
  35 #include "cifs_debug.h"
  36 #include "cifsencrypt.h"
  37
  38 #ifndef false
  39 #define false 0
  40 #endif
  41 #ifndef true
  42 #define true 1
  43 #endif
  44
  45 /* following came from the other byteorder.h to avoid include conflicts */
  46 #define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
  47 #define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
  48 #define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
  49
  50 /*The following definitions come from  libsmb/smbencrypt.c  */
  51
  52 void SMBencrypt(unsigned char *passwd, const unsigned char *c8,
  53                 unsigned char *p24);
  54 void E_md4hash(const unsigned char *passwd, unsigned char *p16);
  55 static void SMBOWFencrypt(unsigned char passwd[16], const unsigned char *c8,
  56                    unsigned char p24[24]);
  57 void SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24);
  58
  59 /*
  60    This implements the X/Open SMB password encryption
  61    It takes a password, a 8 byte "crypt key" and puts 24 bytes of
  62    encrypted password into p24 */
  63 /* Note that password must be uppercased and null terminated */
  64 void
  65 SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24)
  66 {
  67         unsigned char p14[15], p21[21];
  68
  69         memset(p21, '\0', 21);
  70         memset(p14, '\0', 14);
  71         strncpy((char *) p14, (char *) passwd, 14);
  72
  73 /*      strupper((char *)p14); *//* BB at least uppercase the easy range */
  74         E_P16(p14, p21);
  75
  76         SMBOWFencrypt(p21, c8, p24);
  77
  78         memset(p14, 0, 15);
  79         memset(p21, 0, 21);
  80 }
  81
  82 /* Routines for Windows NT MD4 Hash functions. */
  83 static int
  84 _my_wcslen(__u16 *str)
  85 {
  86         int len = 0;
  87         while (*str++ != 0)
  88                 len++;
  89         return len;
  90 }
  91
  92 /*
  93  * Convert a string into an NT UNICODE string.
  94  * Note that regardless of processor type
  95  * this must be in intel (little-endian)
  96  * format.
  97  */
  98
  99 static int
 100 _my_mbstowcs(__u16 *dst, const unsigned char *src, int len)
 101 {       /* BB not a very good conversion routine - change/fix */
 102         int i;
 103         __u16 val;
 104
 105         for (i = 0; i < len; i++) {
 106                 val = *src;
 107                 SSVAL(dst, 0, val);
 108                 dst++;
 109                 src++;
 110                 if (val == 0)
 111                         break;
 112         }
 113         return i;
 114 }
 115
 116 /*
 117  * Creates the MD4 Hash of the users password in NT UNICODE.
 118  */
 119
 120 void
 121 E_md4hash(const unsigned char *passwd, unsigned char *p16)
 122 {
 123         int len;
 124         __u16 wpwd[129];
 125
 126         /* Password cannot be longer than 128 characters */
 127         if (passwd) {
 128                 len = strlen((char *) passwd);
 129                 if (len > 128)
 130                         len = 128;
 131
 132                 /* Password must be converted to NT unicode */
 133                 _my_mbstowcs(wpwd, passwd, len);
 134         } else
 135                 len = 0;
 136
 137         wpwd[len] = 0;  /* Ensure string is null terminated */
 138         /* Calculate length in bytes */
 139         len = _my_wcslen(wpwd) * sizeof(__u16);
 140
 141         mdfour(p16, (unsigned char *) wpwd, len);
 142         memset(wpwd, 0, 129 * 2);
 143 }
 144
 145 #if 0 /* currently unused */
 146 /* Does both the NT and LM owfs of a user's password */
 147 static void
 148 nt_lm_owf_gen(char *pwd, unsigned char nt_p16[16], unsigned char p16[16])
 149 {
 150         char passwd[514];
 151
 152         memset(passwd, '\0', 514);
 153         if (strlen(pwd) < 513)
 154                 strcpy(passwd, pwd);
 155         else
 156                 memcpy(passwd, pwd, 512);
 157         /* Calculate the MD4 hash (NT compatible) of the password */
 158         memset(nt_p16, '\0', 16);
 159         E_md4hash(passwd, nt_p16);
 160
 161         /* Mangle the passwords into Lanman format */
 162         passwd[14] = '\0';
 163 /*      strupper(passwd); */
 164
 165         /* Calculate the SMB (lanman) hash functions of the password */
 166
 167         memset(p16, '\0', 16);
 168         E_P16((unsigned char *) passwd, (unsigned char *) p16);
 169
 170         /* clear out local copy of user's password (just being paranoid). */
 171         memset(passwd, '\0', sizeof(passwd));
 172 }
 173 #endif
 174
 175 /* Does the NTLMv2 owfs of a user's password */
 176 #if 0  /* function not needed yet - but will be soon */
 177 static void
 178 ntv2_owf_gen(const unsigned char owf[16], const char *user_n,
 179                 const char *domain_n, unsigned char kr_buf[16],
 180                 const struct nls_table *nls_codepage)
 181 {
 182         wchar_t *user_u;
 183         wchar_t *dom_u;
 184         int user_l, domain_l;
 185         struct HMACMD5Context ctx;
 186
 187         /* might as well do one alloc to hold both (user_u and dom_u) */
 188         user_u = kmalloc(2048 * sizeof(wchar_t), GFP_KERNEL);
 189         if (user_u == NULL)
 190                 return;
 191         dom_u = user_u + 1024;
 192
 193         /* push_ucs2(NULL, user_u, user_n, (user_l+1)*2,
 194                         STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER);
 195            push_ucs2(NULL, dom_u, domain_n, (domain_l+1)*2,
 196                         STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER); */
 197
 198         /* BB user and domain may need to be uppercased */
 199         user_l = cifs_strtoUCS(user_u, user_n, 511, nls_codepage);
 200         domain_l = cifs_strtoUCS(dom_u, domain_n, 511, nls_codepage);
 201
 202         user_l++;               /* trailing null */
 203         domain_l++;
 204
 205         hmac_md5_init_limK_to_64(owf, 16, &ctx);
 206         hmac_md5_update((const unsigned char *) user_u, user_l * 2, &ctx);
 207         hmac_md5_update((const unsigned char *) dom_u, domain_l * 2, &ctx);
 208         hmac_md5_final(kr_buf, &ctx);
 209
 210         kfree(user_u);
 211 }
 212 #endif
 213
 214 /* Does the des encryption from the NT or LM MD4 hash. */
 215 static void
 216 SMBOWFencrypt(unsigned char passwd[16], const unsigned char *c8,
 217               unsigned char p24[24])
 218 {
 219         unsigned char p21[21];
 220
 221         memset(p21, '\0', 21);
 222
 223         memcpy(p21, passwd, 16);
 224         E_P24(p21, c8, p24);
 225 }
 226
 227 /* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
 228 #if 0 /* currently unused */
 229 static void
 230 NTLMSSPOWFencrypt(unsigned char passwd[8],
 231                   unsigned char *ntlmchalresp, unsigned char p24[24])
 232 {
 233         unsigned char p21[21];
 234
 235         memset(p21, '\0', 21);
 236         memcpy(p21, passwd, 8);
 237         memset(p21 + 8, 0xbd, 8);
 238
 239         E_P24(p21, ntlmchalresp, p24);
 240 }
 241 #endif
 242
 243 /* Does the NT MD4 hash then des encryption. */
 244
 245 void
 246 SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24)
 247 {
 248         unsigned char p21[21];
 249
 250         memset(p21, '\0', 21);
 251
 252         E_md4hash(passwd, p21);
 253         SMBOWFencrypt(p21, c8, p24);
 254 }
 255
 256
 257 /* Does the md5 encryption from the NT hash for NTLMv2. */
 258 /* These routines will be needed later */
 259 #if 0
 260 static void
 261 SMBOWFencrypt_ntv2(const unsigned char kr[16],
 262                    const struct data_blob *srv_chal,
 263                    const struct data_blob *cli_chal, unsigned char resp_buf[16])
 264 {
 265         struct HMACMD5Context ctx;
 266
 267         hmac_md5_init_limK_to_64(kr, 16, &ctx);
 268         hmac_md5_update(srv_chal->data, srv_chal->length, &ctx);
 269         hmac_md5_update(cli_chal->data, cli_chal->length, &ctx);
 270         hmac_md5_final(resp_buf, &ctx);
 271 }
 272
 273 static void
 274 SMBsesskeygen_ntv2(const unsigned char kr[16],
 275                    const unsigned char *nt_resp, __u8 sess_key[16])
 276 {
 277         struct HMACMD5Context ctx;
 278
 279         hmac_md5_init_limK_to_64(kr, 16, &ctx);
 280         hmac_md5_update(nt_resp, 16, &ctx);
 281         hmac_md5_final((unsigned char *) sess_key, &ctx);
 282 }
 283
 284 static void
 285 SMBsesskeygen_ntv1(const unsigned char kr[16],
 286                    const unsigned char *nt_resp, __u8 sess_key[16])
 287 {
 288         mdfour((unsigned char *) sess_key, (unsigned char *) kr, 16);
 289 }
 290 #endif