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/slab.h>
  28 #include <linux/fs.h>
  29 #include <linux/string.h>
  30 #include <linux/kernel.h>
  31 #include <linux/random.h>
  32 #include "cifs_unicode.h"
  33 #include "cifspdu.h"
  34 #include "cifsglob.h"
  35 #include "md5.h"
  36 #include "cifs_debug.h"
  37 #include "cifsencrypt.h"
  38
  39 #ifndef false
  40 #define false 0
  41 #endif
  42 #ifndef true
  43 #define true 1
  44 #endif
  45
  46 /* following came from the other byteorder.h to avoid include conflicts */
  47 #define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
  48 #define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
  49 #define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
  50
  51 /*The following definitions come from  libsmb/smbencrypt.c  */
  52
  53 void SMBencrypt(unsigned char *passwd, const unsigned char *c8,
  54                 unsigned char *p24);
  55 void E_md4hash(const unsigned char *passwd, unsigned char *p16);
  56 static void SMBOWFencrypt(unsigned char passwd[16], const unsigned char *c8,
  57                    unsigned char p24[24]);
  58 void SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24);
  59
  60 /*
  61    This implements the X/Open SMB password encryption
  62    It takes a password, a 8 byte "crypt key" and puts 24 bytes of
  63    encrypted password into p24 */
  64 /* Note that password must be uppercased and null terminated */
  65 void
  66 SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24)
  67 {
  68         unsigned char p14[15], p21[21];
  69
  70         memset(p21, '\0', 21);
  71         memset(p14, '\0', 14);
  72         strncpy((char *) p14, (char *) passwd, 14);
  73
  74 /*      strupper((char *)p14); *//* BB at least uppercase the easy range */
  75         E_P16(p14, p21);
  76
  77         SMBOWFencrypt(p21, c8, p24);
  78
  79         memset(p14, 0, 15);
  80         memset(p21, 0, 21);
  81 }
  82
  83 /* Routines for Windows NT MD4 Hash functions. */
  84 static int
  85 _my_wcslen(__u16 *str)
  86 {
  87         int len = 0;
  88         while (*str++ != 0)
  89                 len++;
  90         return len;
  91 }
  92
  93 /*
  94  * Convert a string into an NT UNICODE string.
  95  * Note that regardless of processor type
  96  * this must be in intel (little-endian)
  97  * format.
  98  */
  99
 100 static int
 101 _my_mbstowcs(__u16 *dst, const unsigned char *src, int len)
 102 {       /* BB not a very good conversion routine - change/fix */
 103         int i;
 104         __u16 val;
 105
 106         for (i = 0; i < len; i++) {
 107                 val = *src;
 108                 SSVAL(dst, 0, val);
 109                 dst++;
 110                 src++;
 111                 if (val == 0)
 112                         break;
 113         }
 114         return i;
 115 }
 116
 117 /*
 118  * Creates the MD4 Hash of the users password in NT UNICODE.
 119  */
 120
 121 void
 122 E_md4hash(const unsigned char *passwd, unsigned char *p16)
 123 {
 124         int len;
 125         __u16 wpwd[129];
 126
 127         /* Password cannot be longer than 128 characters */
 128         if (passwd) {
 129                 len = strlen((char *) passwd);
 130                 if (len > 128)
 131                         len = 128;
 132
 133                 /* Password must be converted to NT unicode */
 134                 _my_mbstowcs(wpwd, passwd, len);
 135         } else
 136                 len = 0;
 137
 138         wpwd[len] = 0;  /* Ensure string is null terminated */
 139         /* Calculate length in bytes */
 140         len = _my_wcslen(wpwd) * sizeof(__u16);
 141
 142         mdfour(p16, (unsigned char *) wpwd, len);
 143         memset(wpwd, 0, 129 * 2);
 144 }
 145
 146 #if 0 /* currently unused */
 147 /* Does both the NT and LM owfs of a user's password */
 148 static void
 149 nt_lm_owf_gen(char *pwd, unsigned char nt_p16[16], unsigned char p16[16])
 150 {
 151         char passwd[514];
 152
 153         memset(passwd, '\0', 514);
 154         if (strlen(pwd) < 513)
 155                 strcpy(passwd, pwd);
 156         else
 157                 memcpy(passwd, pwd, 512);
 158         /* Calculate the MD4 hash (NT compatible) of the password */
 159         memset(nt_p16, '\0', 16);
 160         E_md4hash(passwd, nt_p16);
 161
 162         /* Mangle the passwords into Lanman format */
 163         passwd[14] = '\0';
 164 /*      strupper(passwd); */
 165
 166         /* Calculate the SMB (lanman) hash functions of the password */
 167
 168         memset(p16, '\0', 16);
 169         E_P16((unsigned char *) passwd, (unsigned char *) p16);
 170
 171         /* clear out local copy of user's password (just being paranoid). */
 172         memset(passwd, '\0', sizeof(passwd));
 173 }
 174 #endif
 175
 176 /* Does the NTLMv2 owfs of a user's password */
 177 #if 0  /* function not needed yet - but will be soon */
 178 static void
 179 ntv2_owf_gen(const unsigned char owf[16], const char *user_n,
 180                 const char *domain_n, unsigned char kr_buf[16],
 181                 const struct nls_table *nls_codepage)
 182 {
 183         wchar_t *user_u;
 184         wchar_t *dom_u;
 185         int user_l, domain_l;
 186         struct HMACMD5Context ctx;
 187
 188         /* might as well do one alloc to hold both (user_u and dom_u) */
 189         user_u = kmalloc(2048 * sizeof(wchar_t), GFP_KERNEL);
 190         if (user_u == NULL)
 191                 return;
 192         dom_u = user_u + 1024;
 193
 194         /* push_ucs2(NULL, user_u, user_n, (user_l+1)*2,
 195                         STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER);
 196            push_ucs2(NULL, dom_u, domain_n, (domain_l+1)*2,
 197                         STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER); */
 198
 199         /* BB user and domain may need to be uppercased */
 200         user_l = cifs_strtoUCS(user_u, user_n, 511, nls_codepage);
 201         domain_l = cifs_strtoUCS(dom_u, domain_n, 511, nls_codepage);
 202
 203         user_l++;               /* trailing null */
 204         domain_l++;
 205
 206         hmac_md5_init_limK_to_64(owf, 16, &ctx);
 207         hmac_md5_update((const unsigned char *) user_u, user_l * 2, &ctx);
 208         hmac_md5_update((const unsigned char *) dom_u, domain_l * 2, &ctx);
 209         hmac_md5_final(kr_buf, &ctx);
 210
 211         kfree(user_u);
 212 }
 213 #endif
 214
 215 /* Does the des encryption from the NT or LM MD4 hash. */
 216 static void
 217 SMBOWFencrypt(unsigned char passwd[16], const unsigned char *c8,
 218               unsigned char p24[24])
 219 {
 220         unsigned char p21[21];
 221
 222         memset(p21, '\0', 21);
 223
 224         memcpy(p21, passwd, 16);
 225         E_P24(p21, c8, p24);
 226 }
 227
 228 /* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
 229 #if 0 /* currently unused */
 230 static void
 231 NTLMSSPOWFencrypt(unsigned char passwd[8],
 232                   unsigned char *ntlmchalresp, unsigned char p24[24])
 233 {
 234         unsigned char p21[21];
 235
 236         memset(p21, '\0', 21);
 237         memcpy(p21, passwd, 8);
 238         memset(p21 + 8, 0xbd, 8);
 239
 240         E_P24(p21, ntlmchalresp, p24);
 241 }
 242 #endif
 243
 244 /* Does the NT MD4 hash then des encryption. */
 245
 246 void
 247 SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24)
 248 {
 249         unsigned char p21[21];
 250
 251         memset(p21, '\0', 21);
 252
 253         E_md4hash(passwd, p21);
 254         SMBOWFencrypt(p21, c8, p24);
 255 }
 256
 257
 258 /* Does the md5 encryption from the NT hash for NTLMv2. */
 259 /* These routines will be needed later */
 260 #if 0
 261 static void
 262 SMBOWFencrypt_ntv2(const unsigned char kr[16],
 263                    const struct data_blob *srv_chal,
 264                    const struct data_blob *cli_chal, unsigned char resp_buf[16])
 265 {
 266         struct HMACMD5Context ctx;
 267
 268         hmac_md5_init_limK_to_64(kr, 16, &ctx);
 269         hmac_md5_update(srv_chal->data, srv_chal->length, &ctx);
 270         hmac_md5_update(cli_chal->data, cli_chal->length, &ctx);
 271         hmac_md5_final(resp_buf, &ctx);
 272 }
 273
 274 static void
 275 SMBsesskeygen_ntv2(const unsigned char kr[16],
 276                    const unsigned char *nt_resp, __u8 sess_key[16])
 277 {
 278         struct HMACMD5Context ctx;
 279
 280         hmac_md5_init_limK_to_64(kr, 16, &ctx);
 281         hmac_md5_update(nt_resp, 16, &ctx);
 282         hmac_md5_final((unsigned char *) sess_key, &ctx);
 283 }
 284
 285 static void
 286 SMBsesskeygen_ntv1(const unsigned char kr[16],
 287                    const unsigned char *nt_resp, __u8 sess_key[16])
 288 {
 289         mdfour((unsigned char *) sess_key, (unsigned char *) kr, 16);
 290 }
 291 #endif