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 "cifsglob.h" 24 #include "cifs_debug.h" 25 #include "cifsproto.h" 26 #include "../common/md4.h" 27 28 /* following came from the other byteorder.h to avoid include conflicts */ 29 #define CVAL(buf,pos) (((unsigned char *)(buf))[pos]) 30 #define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8) 31 #define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val))) 32 33 /* produce a md4 message digest from data of length n bytes */ 34 static int 35 mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len) 36 { 37 int rc; 38 struct md4_ctx mctx; 39 40 rc = cifs_md4_init(&mctx); 41 if (rc) { 42 cifs_dbg(VFS, "%s: Could not init MD4\n", __func__); 43 goto mdfour_err; 44 } 45 rc = cifs_md4_update(&mctx, link_str, link_len); 46 if (rc) { 47 cifs_dbg(VFS, "%s: Could not update MD4\n", __func__); 48 goto mdfour_err; 49 } 50 rc = cifs_md4_final(&mctx, md4_hash); 51 if (rc) 52 cifs_dbg(VFS, "%s: Could not finalize MD4\n", __func__); 53 54 55 mdfour_err: 56 return rc; 57 } 58 59 /* 60 * Creates the MD4 Hash of the users password in NT UNICODE. 61 */ 62 63 int 64 E_md4hash(const unsigned char *passwd, unsigned char *p16, 65 const struct nls_table *codepage) 66 { 67 int rc; 68 int len; 69 __le16 wpwd[129]; 70 71 /* Password cannot be longer than 128 characters */ 72 if (passwd) /* Password must be converted to NT unicode */ 73 len = cifs_strtoUTF16(wpwd, passwd, 128, codepage); 74 else { 75 len = 0; 76 *wpwd = 0; /* Ensure string is null terminated */ 77 } 78 79 rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16)); 80 memzero_explicit(wpwd, sizeof(wpwd)); 81 82 return rc; 83 } 84