LXR linux/fs/cifs/smbencrypt.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3   Unix SMB/Netbios implementation.
   4   Version 1.9.
   5   SMB parameters and setup
   6   Copyright (C) Andrew Tridgell 1992-2000
   7   Copyright (C) Luke Kenneth Casson Leighton 1996-2000
   8   Modified by Jeremy Allison 1995.
   9   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
  10   Modified by Steve French (sfrench@us.ibm.com) 2002-2003
  11
  12*/
  13
  14#include <linux/module.h>
  15#include <linux/slab.h>
  16#include <linux/fips.h>
  17#include <linux/fs.h>
  18#include <linux/string.h>
  19#include <linux/kernel.h>
  20#include <linux/random.h>
  21#include "cifs_fs_sb.h"
  22#include "cifs_unicode.h"
  23#include "cifspdu.h"
  24#include "cifsglob.h"
  25#include "cifs_debug.h"
  26#include "cifsproto.h"
  27#include "../smbfs_common/md4.h"
  28
  29#ifndef false
  30#define false 0
  31#endif
  32#ifndef true
  33#define true 1
  34#endif
  35
  36/* following came from the other byteorder.h to avoid include conflicts */
  37#define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
  38#define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
  39#define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
  40
  41/* produce a md4 message digest from data of length n bytes */
  42static int
  43mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len)
  44{
  45        int rc;
  46        struct md4_ctx mctx;
  47
  48        rc = cifs_md4_init(&mctx);
  49        if (rc) {
  50                cifs_dbg(VFS, "%s: Could not init MD4\n", __func__);
  51                goto mdfour_err;
  52        }
  53        rc = cifs_md4_update(&mctx, link_str, link_len);
  54        if (rc) {
  55                cifs_dbg(VFS, "%s: Could not update MD4\n", __func__);
  56                goto mdfour_err;
  57        }
  58        rc = cifs_md4_final(&mctx, md4_hash);
  59        if (rc)
  60                cifs_dbg(VFS, "%s: Could not finalize MD4\n", __func__);
  61
  62
  63mdfour_err:
  64        return rc;
  65}
  66
  67/*
  68 * Creates the MD4 Hash of the users password in NT UNICODE.
  69 */
  70
  71int
  72E_md4hash(const unsigned char *passwd, unsigned char *p16,
  73        const struct nls_table *codepage)
  74{
  75        int rc;
  76        int len;
  77        __le16 wpwd[129];
  78
  79        /* Password cannot be longer than 128 characters */
  80        if (passwd) /* Password must be converted to NT unicode */
  81                len = cifs_strtoUTF16(wpwd, passwd, 128, codepage);
  82        else {
  83                len = 0;
  84                *wpwd = 0; /* Ensure string is null terminated */
  85        }
  86
  87        rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16));
  88        memzero_explicit(wpwd, sizeof(wpwd));
  89
  90        return rc;
  91}
  92