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 "md5.h"
  34 #include "cifs_debug.h"
  35
  36 #ifndef FALSE
  37 #define FALSE 0
  38 #endif
  39 #ifndef TRUE
  40 #define TRUE 1
  41 #endif
  42
  43 /* following came from the other byteorder.h to avoid include conflicts */
  44 #define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
  45 #define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
  46 #define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
  47
  48 /*The following definitions come from  lib/md4.c  */
  49
  50 void mdfour(unsigned char *out, unsigned char *in, int n);
  51
  52 /*The following definitions come from  libsmb/smbdes.c  */
  53
  54 void E_P16(unsigned char *p14, unsigned char *p16);
  55 void E_P24(unsigned char *p21, unsigned char *c8, unsigned char *p24);
  56 void D_P16(unsigned char *p14, unsigned char *in, unsigned char *out);
  57 void E_old_pw_hash(unsigned char *p14, unsigned char *in, unsigned char *out);
  58 void cred_hash1(unsigned char *out, unsigned char *in, unsigned char *key);
  59 void cred_hash2(unsigned char *out, unsigned char *in, unsigned char *key);
  60 void cred_hash3(unsigned char *out, unsigned char *in, unsigned char *key,
  61                 int forw);
  62
  63 /*The following definitions come from  libsmb/smbencrypt.c  */
  64
  65 void SMBencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24);
  66 void E_md4hash(const unsigned char *passwd, unsigned char *p16);
  67 void nt_lm_owf_gen(char *pwd, unsigned char nt_p16[16], unsigned char p16[16]);
  68 void SMBOWFencrypt(unsigned char passwd[16], unsigned char *c8,
  69                    unsigned char p24[24]);
  70 void NTLMSSPOWFencrypt(unsigned char passwd[8],
  71                        unsigned char *ntlmchalresp, unsigned char p24[24]);
  72 void SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24);
  73
  74 /*
  75    This implements the X/Open SMB password encryption
  76    It takes a password, a 8 byte "crypt key" and puts 24 bytes of
  77    encrypted password into p24 */
  78 /* Note that password must be uppercased and null terminated */
  79 void
  80 SMBencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24)
  81 {
  82         unsigned char p14[15], p21[21];
  83
  84         memset(p21, '\0', 21);
  85         memset(p14, '\0', 14);
  86         strncpy((char *) p14, (char *) passwd, 14);
  87
  88 /*      strupper((char *)p14); *//* BB at least uppercase the easy range */
  89         E_P16(p14, p21);
  90
  91         SMBOWFencrypt(p21, c8, p24);
  92
  93         memset(p14,0,15);
  94         memset(p21,0,21);
  95 }
  96
  97 /* Routines for Windows NT MD4 Hash functions. */
  98 static int
  99 _my_wcslen(__u16 * str)
 100 {
 101         int len = 0;
 102         while (*str++ != 0)
 103                 len++;
 104         return len;
 105 }
 106
 107 /*
 108  * Convert a string into an NT UNICODE string.
 109  * Note that regardless of processor type
 110  * this must be in intel (little-endian)
 111  * format.
 112  */
 113
 114 static int
 115 _my_mbstowcs(__u16 * dst, const unsigned char *src, int len)
 116 {                               /* not a very good conversion routine - change/fix */
 117         int i;
 118         __u16 val;
 119
 120         for (i = 0; i < len; i++) {
 121                 val = *src;
 122                 SSVAL(dst, 0, val);
 123                 dst++;
 124                 src++;
 125                 if (val == 0)
 126                         break;
 127         }
 128         return i;
 129 }
 130
 131 /*
 132  * Creates the MD4 Hash of the users password in NT UNICODE.
 133  */
 134
 135 void
 136 E_md4hash(const unsigned char *passwd, unsigned char *p16)
 137 {
 138         int len;
 139         __u16 wpwd[129];
 140
 141         /* Password cannot be longer than 128 characters */
 142         if(passwd) {
 143                 len = strlen((char *) passwd);
 144                 if (len > 128) {
 145                         len = 128;
 146                 }
 147                 /* Password must be converted to NT unicode */
 148                 _my_mbstowcs(wpwd, passwd, len);
 149         } else
 150                 len = 0;
 151
 152         wpwd[len] = 0;  /* Ensure string is null terminated */
 153         /* Calculate length in bytes */
 154         len = _my_wcslen(wpwd) * sizeof (__u16);
 155
 156         mdfour(p16, (unsigned char *) wpwd, len);
 157         memset(wpwd,0,129 * 2);
 158 }
 159
 160 /* Does both the NT and LM owfs of a user's password */
 161 void
 162 nt_lm_owf_gen(char *pwd, unsigned char nt_p16[16], unsigned char p16[16])
 163 {
 164         char passwd[514];
 165
 166         memset(passwd, '\0', 514);
 167         if (strlen(pwd) < 513)
 168                 strcpy(passwd, pwd);
 169         else
 170                 memcpy(passwd, pwd, 512);
 171         /* Calculate the MD4 hash (NT compatible) of the password */
 172         memset(nt_p16, '\0', 16);
 173         E_md4hash(passwd, nt_p16);
 174
 175         /* Mangle the passwords into Lanman format */
 176         passwd[14] = '\0';
 177 /*      strupper(passwd); */
 178
 179         /* Calculate the SMB (lanman) hash functions of the password */
 180
 181         memset(p16, '\0', 16);
 182         E_P16((unsigned char *) passwd, (unsigned char *) p16);
 183
 184         /* clear out local copy of user's password (just being paranoid). */
 185         memset(passwd, '\0', sizeof (passwd));
 186 }
 187
 188 /* Does the NTLMv2 owfs of a user's password */
 189 void
 190 ntv2_owf_gen(const unsigned char owf[16], const char *user_n,
 191                 const char *domain_n, unsigned char kr_buf[16],
 192                 const struct nls_table *nls_codepage)
 193 {
 194         wchar_t * user_u;
 195         wchar_t * dom_u;
 196         int user_l, domain_l;
 197         struct HMACMD5Context ctx;
 198
 199         /* might as well do one alloc to hold both (user_u and dom_u) */
 200         user_u = kmalloc(2048 * sizeof(wchar_t),GFP_KERNEL);
 201         if(user_u == NULL)
 202                 return;
 203         dom_u = user_u + 1024;
 204
 205         /* push_ucs2(NULL, user_u, user_n, (user_l+1)*2, STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER);
 206            push_ucs2(NULL, dom_u, domain_n, (domain_l+1)*2, STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER); */
 207
 208         /* BB user and domain may need to be uppercased */
 209         user_l = cifs_strtoUCS(user_u, user_n, 511, nls_codepage);
 210         domain_l = cifs_strtoUCS(dom_u, domain_n, 511, nls_codepage);
 211
 212         user_l++;               /* trailing null */
 213         domain_l++;
 214
 215         hmac_md5_init_limK_to_64(owf, 16, &ctx);
 216         hmac_md5_update((const unsigned char *) user_u, user_l * 2, &ctx);
 217         hmac_md5_update((const unsigned char *) dom_u, domain_l * 2, &ctx);
 218         hmac_md5_final(kr_buf, &ctx);
 219
 220         kfree(user_u);
 221 }
 222
 223 /* Does the des encryption from the NT or LM MD4 hash. */
 224 void
 225 SMBOWFencrypt(unsigned char passwd[16], unsigned char *c8,
 226               unsigned char p24[24])
 227 {
 228         unsigned char p21[21];
 229
 230         memset(p21, '\0', 21);
 231
 232         memcpy(p21, passwd, 16);
 233         E_P24(p21, c8, p24);
 234 }
 235
 236 /* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
 237 void
 238 NTLMSSPOWFencrypt(unsigned char passwd[8],
 239                   unsigned char *ntlmchalresp, unsigned char p24[24])
 240 {
 241         unsigned char p21[21];
 242
 243         memset(p21, '\0', 21);
 244         memcpy(p21, passwd, 8);
 245         memset(p21 + 8, 0xbd, 8);
 246
 247         E_P24(p21, ntlmchalresp, p24);
 248 }
 249
 250 /* Does the NT MD4 hash then des encryption. */
 251
 252 void
 253 SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24)
 254 {
 255         unsigned char p21[21];
 256
 257         memset(p21, '\0', 21);
 258
 259         E_md4hash(passwd, p21);
 260         SMBOWFencrypt(p21, c8, p24);
 261 }
 262
 263 /* Does the md5 encryption from the NT hash for NTLMv2. */
 264 void
 265 SMBOWFencrypt_ntv2(const unsigned char kr[16],
 266                    const struct data_blob * srv_chal,
 267                    const struct data_blob * cli_chal, unsigned char resp_buf[16])
 268 {
 269         struct HMACMD5Context ctx;
 270
 271         hmac_md5_init_limK_to_64(kr, 16, &ctx);
 272         hmac_md5_update(srv_chal->data, srv_chal->length, &ctx);
 273         hmac_md5_update(cli_chal->data, cli_chal->length, &ctx);
 274         hmac_md5_final(resp_buf, &ctx);
 275 }
 276
 277 void
 278 SMBsesskeygen_ntv2(const unsigned char kr[16],
 279                    const unsigned char *nt_resp, __u8 sess_key[16])
 280 {
 281         struct HMACMD5Context ctx;
 282
 283         hmac_md5_init_limK_to_64(kr, 16, &ctx);
 284         hmac_md5_update(nt_resp, 16, &ctx);
 285         hmac_md5_final((unsigned char *) sess_key, &ctx);
 286 }
 287
 288 void
 289 SMBsesskeygen_ntv1(const unsigned char kr[16],
 290                    const unsigned char *nt_resp, __u8 sess_key[16])
 291 {
 292         mdfour((unsigned char *) sess_key, (unsigned char *) kr, 16);
 293 }