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 "../common/md4.h"
28
29 /* following came from the other byteorder.h to avoid include conflicts */
30 #define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
31 #define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
32 #define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
33
34 /* produce a md4 message digest from data of length n bytes */
35 static int
36 mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len)
37 {
38 int rc;
39 struct md4_ctx mctx;
40
41 rc = cifs_md4_init(&mctx);
42 if (rc) {
43 cifs_dbg(VFS, "%s: Could not init MD4\n", __func__);
44 goto mdfour_err;
45 }
46 rc = cifs_md4_update(&mctx, link_str, link_len);
47 if (rc) {
48 cifs_dbg(VFS, "%s: Could not update MD4\n", __func__);
49 goto mdfour_err;
50 }
51 rc = cifs_md4_final(&mctx, md4_hash);
52 if (rc)
53 cifs_dbg(VFS, "%s: Could not finalize MD4\n", __func__);
54
55
56 mdfour_err:
57 return rc;
58 }
59
60 /*
61 * Creates the MD4 Hash of the users password in NT UNICODE.
62 */
63
64 int
65 E_md4hash(const unsigned char *passwd, unsigned char *p16,
66 const struct nls_table *codepage)
67 {
68 int rc;
69 int len;
70 __le16 wpwd[129];
71
72 /* Password cannot be longer than 128 characters */
73 if (passwd) /* Password must be converted to NT unicode */
74 len = cifs_strtoUTF16(wpwd, passwd, 128, codepage);
75 else {
76 len = 0;
77 *wpwd = 0; /* Ensure string is null terminated */
78 }
79
80 rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16));
81 memzero_explicit(wpwd, sizeof(wpwd));
82
83 return rc;
84 }
85
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