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