linux/fs/cifs/smbencrypt.c
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   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 "cifs_debug.h"
  36#include "cifsproto.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/* produce a md4 message digest from data of length n bytes */
  51int
  52mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len)
  53{
  54        int rc;
  55        unsigned int size;
  56        struct crypto_shash *md4;
  57        struct sdesc *sdescmd4;
  58
  59        md4 = crypto_alloc_shash("md4", 0, 0);
  60        if (IS_ERR(md4)) {
  61                rc = PTR_ERR(md4);
  62                cERROR(1, "%s: Crypto md4 allocation error %d\n", __func__, rc);
  63                return rc;
  64        }
  65        size = sizeof(struct shash_desc) + crypto_shash_descsize(md4);
  66        sdescmd4 = kmalloc(size, GFP_KERNEL);
  67        if (!sdescmd4) {
  68                rc = -ENOMEM;
  69                cERROR(1, "%s: Memory allocation failure\n", __func__);
  70                goto mdfour_err;
  71        }
  72        sdescmd4->shash.tfm = md4;
  73        sdescmd4->shash.flags = 0x0;
  74
  75        rc = crypto_shash_init(&sdescmd4->shash);
  76        if (rc) {
  77                cERROR(1, "%s: Could not init md4 shash\n", __func__);
  78                goto mdfour_err;
  79        }
  80        crypto_shash_update(&sdescmd4->shash, link_str, link_len);
  81        rc = crypto_shash_final(&sdescmd4->shash, md4_hash);
  82
  83mdfour_err:
  84        crypto_free_shash(md4);
  85        kfree(sdescmd4);
  86
  87        return rc;
  88}
  89
  90/* Does the des encryption from the NT or LM MD4 hash. */
  91static void
  92SMBOWFencrypt(unsigned char passwd[16], const unsigned char *c8,
  93              unsigned char p24[24])
  94{
  95        unsigned char p21[21];
  96
  97        memset(p21, '\0', 21);
  98
  99        memcpy(p21, passwd, 16);
 100        E_P24(p21, c8, p24);
 101}
 102
 103/*
 104   This implements the X/Open SMB password encryption
 105   It takes a password, a 8 byte "crypt key" and puts 24 bytes of
 106   encrypted password into p24 */
 107/* Note that password must be uppercased and null terminated */
 108void
 109SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24)
 110{
 111        unsigned char p14[15], p21[21];
 112
 113        memset(p21, '\0', 21);
 114        memset(p14, '\0', 14);
 115        strncpy((char *) p14, (char *) passwd, 14);
 116
 117/*      strupper((char *)p14); *//* BB at least uppercase the easy range */
 118        E_P16(p14, p21);
 119
 120        SMBOWFencrypt(p21, c8, p24);
 121
 122        memset(p14, 0, 15);
 123        memset(p21, 0, 21);
 124}
 125
 126/* Routines for Windows NT MD4 Hash functions. */
 127static int
 128_my_wcslen(__u16 *str)
 129{
 130        int len = 0;
 131        while (*str++ != 0)
 132                len++;
 133        return len;
 134}
 135
 136/*
 137 * Convert a string into an NT UNICODE string.
 138 * Note that regardless of processor type
 139 * this must be in intel (little-endian)
 140 * format.
 141 */
 142
 143static int
 144_my_mbstowcs(__u16 *dst, const unsigned char *src, int len)
 145{       /* BB not a very good conversion routine - change/fix */
 146        int i;
 147        __u16 val;
 148
 149        for (i = 0; i < len; i++) {
 150                val = *src;
 151                SSVAL(dst, 0, val);
 152                dst++;
 153                src++;
 154                if (val == 0)
 155                        break;
 156        }
 157        return i;
 158}
 159
 160/*
 161 * Creates the MD4 Hash of the users password in NT UNICODE.
 162 */
 163
 164int
 165E_md4hash(const unsigned char *passwd, unsigned char *p16)
 166{
 167        int rc;
 168        int len;
 169        __u16 wpwd[129];
 170
 171        /* Password cannot be longer than 128 characters */
 172        if (passwd) {
 173                len = strlen((char *) passwd);
 174                if (len > 128)
 175                        len = 128;
 176
 177                /* Password must be converted to NT unicode */
 178                _my_mbstowcs(wpwd, passwd, len);
 179        } else
 180                len = 0;
 181
 182        wpwd[len] = 0;  /* Ensure string is null terminated */
 183        /* Calculate length in bytes */
 184        len = _my_wcslen(wpwd) * sizeof(__u16);
 185
 186        rc = mdfour(p16, (unsigned char *) wpwd, len);
 187        memset(wpwd, 0, 129 * 2);
 188
 189        return rc;
 190}
 191
 192#if 0 /* currently unused */
 193/* Does both the NT and LM owfs of a user's password */
 194static void
 195nt_lm_owf_gen(char *pwd, unsigned char nt_p16[16], unsigned char p16[16])
 196{
 197        char passwd[514];
 198
 199        memset(passwd, '\0', 514);
 200        if (strlen(pwd) < 513)
 201                strcpy(passwd, pwd);
 202        else
 203                memcpy(passwd, pwd, 512);
 204        /* Calculate the MD4 hash (NT compatible) of the password */
 205        memset(nt_p16, '\0', 16);
 206        E_md4hash(passwd, nt_p16);
 207
 208        /* Mangle the passwords into Lanman format */
 209        passwd[14] = '\0';
 210/*      strupper(passwd); */
 211
 212        /* Calculate the SMB (lanman) hash functions of the password */
 213
 214        memset(p16, '\0', 16);
 215        E_P16((unsigned char *) passwd, (unsigned char *) p16);
 216
 217        /* clear out local copy of user's password (just being paranoid). */
 218        memset(passwd, '\0', sizeof(passwd));
 219}
 220#endif
 221
 222/* Does the NTLMv2 owfs of a user's password */
 223#if 0  /* function not needed yet - but will be soon */
 224static void
 225ntv2_owf_gen(const unsigned char owf[16], const char *user_n,
 226                const char *domain_n, unsigned char kr_buf[16],
 227                const struct nls_table *nls_codepage)
 228{
 229        wchar_t *user_u;
 230        wchar_t *dom_u;
 231        int user_l, domain_l;
 232        struct HMACMD5Context ctx;
 233
 234        /* might as well do one alloc to hold both (user_u and dom_u) */
 235        user_u = kmalloc(2048 * sizeof(wchar_t), GFP_KERNEL);
 236        if (user_u == NULL)
 237                return;
 238        dom_u = user_u + 1024;
 239
 240        /* push_ucs2(NULL, user_u, user_n, (user_l+1)*2,
 241                        STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER);
 242           push_ucs2(NULL, dom_u, domain_n, (domain_l+1)*2,
 243                        STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER); */
 244
 245        /* BB user and domain may need to be uppercased */
 246        user_l = cifs_strtoUCS(user_u, user_n, 511, nls_codepage);
 247        domain_l = cifs_strtoUCS(dom_u, domain_n, 511, nls_codepage);
 248
 249        user_l++;               /* trailing null */
 250        domain_l++;
 251
 252        hmac_md5_init_limK_to_64(owf, 16, &ctx);
 253        hmac_md5_update((const unsigned char *) user_u, user_l * 2, &ctx);
 254        hmac_md5_update((const unsigned char *) dom_u, domain_l * 2, &ctx);
 255        hmac_md5_final(kr_buf, &ctx);
 256
 257        kfree(user_u);
 258}
 259#endif
 260
 261/* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
 262#if 0 /* currently unused */
 263static void
 264NTLMSSPOWFencrypt(unsigned char passwd[8],
 265                  unsigned char *ntlmchalresp, unsigned char p24[24])
 266{
 267        unsigned char p21[21];
 268
 269        memset(p21, '\0', 21);
 270        memcpy(p21, passwd, 8);
 271        memset(p21 + 8, 0xbd, 8);
 272
 273        E_P24(p21, ntlmchalresp, p24);
 274}
 275#endif
 276
 277/* Does the NT MD4 hash then des encryption. */
 278int
 279SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24)
 280{
 281        int rc;
 282        unsigned char p21[21];
 283
 284        memset(p21, '\0', 21);
 285
 286        rc = E_md4hash(passwd, p21);
 287        if (rc) {
 288                cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc);
 289                return rc;
 290        }
 291        SMBOWFencrypt(p21, c8, p24);
 292        return rc;
 293}
 294
 295
 296/* Does the md5 encryption from the NT hash for NTLMv2. */
 297/* These routines will be needed later */
 298#if 0
 299static void
 300SMBOWFencrypt_ntv2(const unsigned char kr[16],
 301                   const struct data_blob *srv_chal,
 302                   const struct data_blob *cli_chal, unsigned char resp_buf[16])
 303{
 304        struct HMACMD5Context ctx;
 305
 306        hmac_md5_init_limK_to_64(kr, 16, &ctx);
 307        hmac_md5_update(srv_chal->data, srv_chal->length, &ctx);
 308        hmac_md5_update(cli_chal->data, cli_chal->length, &ctx);
 309        hmac_md5_final(resp_buf, &ctx);
 310}
 311
 312static void
 313SMBsesskeygen_ntv2(const unsigned char kr[16],
 314                   const unsigned char *nt_resp, __u8 sess_key[16])
 315{
 316        struct HMACMD5Context ctx;
 317
 318        hmac_md5_init_limK_to_64(kr, 16, &ctx);
 319        hmac_md5_update(nt_resp, 16, &ctx);
 320        hmac_md5_final((unsigned char *) sess_key, &ctx);
 321}
 322
 323static void
 324SMBsesskeygen_ntv1(const unsigned char kr[16],
 325                   const unsigned char *nt_resp, __u8 sess_key[16])
 326{
 327        mdfour((unsigned char *) sess_key, (unsigned char *) kr, 16);
 328}
 329#endif
 330