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Linux/fs/cifs/smbencrypt.c

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  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 }
 92 

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