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fs/cifs/smbencrypt.c
5.73 KB
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/* |
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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 |
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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. |
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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. |
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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. */ |
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#include <linux/crypto.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/fs.h> #include <linux/string.h> #include <linux/kernel.h> #include <linux/random.h> |
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#include "cifs_fs_sb.h" |
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#include "cifs_unicode.h" #include "cifspdu.h" |
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#include "cifsglob.h" |
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#include "cifs_debug.h" |
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#include "cifsproto.h" |
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#ifndef false #define false 0 |
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#endif |
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#ifndef true #define true 1 |
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#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))) |
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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); } static int smbhash(unsigned char *out, const unsigned char *in, unsigned char *key) { |
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unsigned char key2[8]; |
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struct crypto_cipher *tfm_des; |
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str_to_key(key, key2); |
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tfm_des = crypto_alloc_cipher("des", 0, 0); |
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if (IS_ERR(tfm_des)) { |
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cifs_dbg(VFS, "could not allocate des crypto API "); |
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return PTR_ERR(tfm_des); |
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} |
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crypto_cipher_setkey(tfm_des, key2, 8); crypto_cipher_encrypt_one(tfm_des, out, in); crypto_free_cipher(tfm_des); |
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return 0; |
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} 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; } 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; } |
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/* 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)) { |
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rc = PTR_ERR(md4); |
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cifs_dbg(VFS, "%s: Crypto md4 allocation error %d ", __func__, rc); |
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return rc; |
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} size = sizeof(struct shash_desc) + crypto_shash_descsize(md4); sdescmd4 = kmalloc(size, GFP_KERNEL); if (!sdescmd4) { rc = -ENOMEM; |
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goto mdfour_err; } sdescmd4->shash.tfm = md4; sdescmd4->shash.flags = 0x0; rc = crypto_shash_init(&sdescmd4->shash); if (rc) { |
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cifs_dbg(VFS, "%s: Could not init md4 shash ", __func__); |
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goto mdfour_err; } |
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rc = crypto_shash_update(&sdescmd4->shash, link_str, link_len); if (rc) { |
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cifs_dbg(VFS, "%s: Could not update with link_str ", __func__); |
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goto mdfour_err; } |
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rc = crypto_shash_final(&sdescmd4->shash, md4_hash); |
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if (rc) |
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cifs_dbg(VFS, "%s: Could not generate md4 hash ", __func__); |
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mdfour_err: crypto_free_shash(md4); kfree(sdescmd4); return rc; } |
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/* This implements the X/Open SMB password encryption |
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It takes a password, a 8 byte "crypt key" and puts 24 bytes of |
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encrypted password into p24 */ /* Note that password must be uppercased and null terminated */ |
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int |
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SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24) |
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{ |
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int rc; unsigned char p14[14], p16[16], p21[21]; |
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memset(p14, '\0', 14); |
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memset(p16, '\0', 16); memset(p21, '\0', 21); |
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memcpy(p14, passwd, 14); rc = E_P16(p14, p16); if (rc) return rc; |
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memcpy(p21, p16, 16); rc = E_P24(p21, c8, p24); |
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return rc; |
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} |
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/* |
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* Creates the MD4 Hash of the users password in NT UNICODE. */ |
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int |
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E_md4hash(const unsigned char *passwd, unsigned char *p16, const struct nls_table *codepage) |
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{ |
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int rc; |
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int len; |
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__le16 wpwd[129]; |
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/* Password cannot be longer than 128 characters */ |
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if (passwd) /* Password must be converted to NT unicode */ |
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len = cifs_strtoUTF16(wpwd, passwd, 128, codepage); |
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else { |
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len = 0; |
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*wpwd = 0; /* Ensure string is null terminated */ } |
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rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16)); |
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memzero_explicit(wpwd, sizeof(wpwd)); |
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return rc; |
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} |
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/* Does the NT MD4 hash then des encryption. */ |
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int |
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SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24, const struct nls_table *codepage) |
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{ |
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int rc; |
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unsigned char p16[16], p21[21]; |
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|
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memset(p16, '\0', 16); |
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memset(p21, '\0', 21); |
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rc = E_md4hash(passwd, p16, codepage); |
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if (rc) { |
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cifs_dbg(FYI, "%s Can't generate NT hash, error: %d ", __func__, rc); |
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return rc; } |
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memcpy(p21, p16, 16); rc = E_P24(p21, c8, p24); |
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return rc; |
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} |