cregit-Linux how code gets into the kernel

Release 4.11 fs/cifs/smbencrypt.c

Directory: fs/cifs
/*
   Unix SMB/Netbios implementation.
   Version 1.9.
   SMB parameters and setup
   Copyright (C) Andrew Tridgell 1992-2000
   Copyright (C) Luke Kenneth Casson Leighton 1996-2000
   Modified by Jeremy Allison 1995.
   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
   Modified by Steve French (sfrench@us.ibm.com) 2002-2003

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <linux/crypto.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/random.h>
#include "cifs_fs_sb.h"
#include "cifs_unicode.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifs_debug.h"
#include "cifsproto.h"

#ifndef false

#define false 0
#endif
#ifndef true

#define true 1
#endif

/* following came from the other byteorder.h to avoid include conflicts */

#define CVAL(buf,pos) (((unsigned char *)(buf))[pos])

#define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)

#define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))


static void str_to_key(unsigned char *str, unsigned char *key) { int i; key[0] = str[0] >> 1; key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2); key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3); key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4); key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5); key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6); key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7); key[7] = str[6] & 0x7F; for (i = 0; i < 8; i++) key[i] = (key[i] << 1); }

Contributors

PersonTokensPropCommitsCommitProp
Steve French232100.00%1100.00%
Total232100.00%1100.00%


static int smbhash(unsigned char *out, const unsigned char *in, unsigned char *key) { unsigned char key2[8]; struct crypto_cipher *tfm_des; str_to_key(key, key2); tfm_des = crypto_alloc_cipher("des", 0, 0); if (IS_ERR(tfm_des)) { cifs_dbg(VFS, "could not allocate des crypto API\n"); return PTR_ERR(tfm_des); } crypto_cipher_setkey(tfm_des, key2, 8); crypto_cipher_encrypt_one(tfm_des, out, in); crypto_free_cipher(tfm_des); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Steve French7979.00%125.00%
Andrew Lutomirski1313.00%125.00%
Herbert Xu55.00%125.00%
Joe Perches33.00%125.00%
Total100100.00%4100.00%


static int E_P16(unsigned char *p14, unsigned char *p16) { int rc; unsigned char sp8[8] = { 0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25 }; rc = smbhash(p16, sp8, p14); if (rc) return rc; rc = smbhash(p16 + 8, sp8, p14 + 7); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
Steve French80100.00%1100.00%
Total80100.00%1100.00%


static int E_P24(unsigned char *p21, const unsigned char *c8, unsigned char *p24) { int rc; rc = smbhash(p24, c8, p21); if (rc) return rc; rc = smbhash(p24 + 8, c8, p21 + 7); if (rc) return rc; rc = smbhash(p24 + 16, c8, p21 + 14); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
Steve French83100.00%1100.00%
Total83100.00%1100.00%

/* produce a md4 message digest from data of length n bytes */
int mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len) { int rc; unsigned int size; struct crypto_shash *md4; struct sdesc *sdescmd4; md4 = crypto_alloc_shash("md4", 0, 0); if (IS_ERR(md4)) { rc = PTR_ERR(md4); cifs_dbg(VFS, "%s: Crypto md4 allocation error %d\n", __func__, rc); return rc; } size = sizeof(struct shash_desc) + crypto_shash_descsize(md4); sdescmd4 = kmalloc(size, GFP_KERNEL); if (!sdescmd4) { rc = -ENOMEM; goto mdfour_err; } sdescmd4->shash.tfm = md4; sdescmd4->shash.flags = 0x0; rc = crypto_shash_init(&sdescmd4->shash); if (rc) { cifs_dbg(VFS, "%s: Could not init md4 shash\n", __func__); goto mdfour_err; } rc = crypto_shash_update(&sdescmd4->shash, link_str, link_len); if (rc) { cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__); goto mdfour_err; } rc = crypto_shash_final(&sdescmd4->shash, md4_hash); if (rc) cifs_dbg(VFS, "%s: Could not generate md4 hash\n", __func__); mdfour_err: crypto_free_shash(md4); kfree(sdescmd4); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
Shirish Pargaonkar19685.59%240.00%
Steve French135.68%120.00%
Joe Perches125.24%120.00%
Jeff Layton83.49%120.00%
Total229100.00%5100.00%

/* This implements the X/Open SMB password encryption It takes a password, a 8 byte "crypt key" and puts 24 bytes of encrypted password into p24 */ /* Note that password must be uppercased and null terminated */
int SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24) { int rc; unsigned char p14[14], p16[16], p21[21]; memset(p14, '\0', 14); memset(p16, '\0', 16); memset(p21, '\0', 21); memcpy(p14, passwd, 14); rc = E_P16(p14, p16); if (rc) return rc; memcpy(p21, p16, 16); rc = E_P24(p21, c8, p24); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
Steve French11599.14%375.00%
Jeff Layton10.86%125.00%
Total116100.00%4100.00%

/* * Creates the MD4 Hash of the users password in NT UNICODE. */
int E_md4hash(const unsigned char *passwd, unsigned char *p16, const struct nls_table *codepage) { int rc; int len; __le16 wpwd[129]; /* Password cannot be longer than 128 characters */ if (passwd) /* Password must be converted to NT unicode */ len = cifs_strtoUTF16(wpwd, passwd, 128, codepage); else { len = 0; *wpwd = 0; /* Ensure string is null terminated */ } rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16)); memzero_explicit(wpwd, sizeof(wpwd)); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
Steve French6969.00%562.50%
Shirish Pargaonkar2929.00%225.00%
Giel van Schijndel22.00%112.50%
Total100100.00%8100.00%

/* Does the NT MD4 hash then des encryption. */
int SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24, const struct nls_table *codepage) { int rc; unsigned char p16[16], p21[21]; memset(p16, '\0', 16); memset(p21, '\0', 21); rc = E_md4hash(passwd, p16, codepage); if (rc) { cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n", __func__, rc); return rc; } memcpy(p21, p16, 16); rc = E_P24(p21, c8, p24); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
Steve French7667.26%240.00%
Shirish Pargaonkar3430.09%240.00%
Joe Perches32.65%120.00%
Total113100.00%5100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Steve French83472.65%1254.55%
Shirish Pargaonkar26122.74%313.64%
Joe Perches181.57%14.55%
Andrew Lutomirski141.22%14.55%
Jeff Layton90.78%29.09%
Herbert Xu70.61%14.55%
Tejun Heo30.26%14.55%
Giel van Schijndel20.17%14.55%
Total1148100.00%22100.00%
Directory: fs/cifs
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.