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