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 #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