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 */
  42 static int
  43 mdfour(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
  63 mdfour_err:
  64         return rc;
  65 }
  66
  67 /*
  68  * Creates the MD4 Hash of the users password in NT UNICODE.
  69  */
  70
  71 int
  72 E_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 }