249 lines
6 KiB
C
249 lines
6 KiB
C
/*
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Unix SMB/Netbios implementation.
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Version 1.9.
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SMB parameters and setup
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Copyright (C) Andrew Tridgell 1992-2000
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Copyright (C) Luke Kenneth Casson Leighton 1996-2000
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Modified by Jeremy Allison 1995.
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Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
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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
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/random.h>
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#include "cifs_fs_sb.h"
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#include "cifs_unicode.h"
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#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
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#define false 0
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#endif
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#ifndef true
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#define true 1
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#endif
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/* following came from the other byteorder.h to avoid include conflicts */
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#define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
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#define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
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#define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
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static void
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str_to_key(unsigned char *str, unsigned char *key)
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{
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int i;
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key[0] = str[0] >> 1;
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key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2);
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key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3);
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key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4);
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key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5);
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key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6);
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key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7);
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key[7] = str[6] & 0x7F;
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for (i = 0; i < 8; i++)
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key[i] = (key[i] << 1);
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}
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static int
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smbhash(unsigned char *out, const unsigned char *in, unsigned char *key)
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{
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int rc;
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unsigned char key2[8];
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struct crypto_blkcipher *tfm_des;
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struct scatterlist sgin, sgout;
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struct blkcipher_desc desc;
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str_to_key(key, key2);
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tfm_des = crypto_alloc_blkcipher("ecb(des)", 0, CRYPTO_ALG_ASYNC);
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if (IS_ERR(tfm_des)) {
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rc = PTR_ERR(tfm_des);
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cifs_dbg(VFS, "could not allocate des crypto API\n");
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goto smbhash_err;
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}
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desc.tfm = tfm_des;
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crypto_blkcipher_setkey(tfm_des, key2, 8);
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sg_init_one(&sgin, in, 8);
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sg_init_one(&sgout, out, 8);
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rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, 8);
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if (rc)
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cifs_dbg(VFS, "could not encrypt crypt key rc: %d\n", rc);
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crypto_free_blkcipher(tfm_des);
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smbhash_err:
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return rc;
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}
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static int
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E_P16(unsigned char *p14, unsigned char *p16)
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{
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int rc;
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unsigned char sp8[8] =
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{ 0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25 };
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rc = smbhash(p16, sp8, p14);
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if (rc)
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return rc;
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rc = smbhash(p16 + 8, sp8, p14 + 7);
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return rc;
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}
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static int
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E_P24(unsigned char *p21, const unsigned char *c8, unsigned char *p24)
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{
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int rc;
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rc = smbhash(p24, c8, p21);
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if (rc)
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return rc;
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rc = smbhash(p24 + 8, c8, p21 + 7);
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if (rc)
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return rc;
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rc = smbhash(p24 + 16, c8, p21 + 14);
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return rc;
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}
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/* produce a md4 message digest from data of length n bytes */
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int
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mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len)
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{
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int rc;
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unsigned int size;
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struct crypto_shash *md4;
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struct sdesc *sdescmd4;
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md4 = crypto_alloc_shash("md4", 0, 0);
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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\n",
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__func__, rc);
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return rc;
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}
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size = sizeof(struct shash_desc) + crypto_shash_descsize(md4);
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sdescmd4 = kmalloc(size, GFP_KERNEL);
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if (!sdescmd4) {
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rc = -ENOMEM;
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goto mdfour_err;
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}
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sdescmd4->shash.tfm = md4;
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sdescmd4->shash.flags = 0x0;
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rc = crypto_shash_init(&sdescmd4->shash);
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if (rc) {
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cifs_dbg(VFS, "%s: Could not init md4 shash\n", __func__);
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goto mdfour_err;
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}
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rc = crypto_shash_update(&sdescmd4->shash, link_str, link_len);
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if (rc) {
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cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__);
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goto mdfour_err;
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}
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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\n", __func__);
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mdfour_err:
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crypto_free_shash(md4);
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kfree(sdescmd4);
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return rc;
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}
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/*
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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 */
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/* 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;
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unsigned char p14[14], p16[16], p21[21];
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memset(p14, '\0', 14);
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memset(p16, '\0', 16);
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memset(p21, '\0', 21);
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memcpy(p14, passwd, 14);
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rc = E_P16(p14, p16);
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if (rc)
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return rc;
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memcpy(p21, p16, 16);
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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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*/
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int
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E_md4hash(const unsigned char *passwd, unsigned char *p16,
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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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}
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rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16));
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memset(wpwd, 0, 129 * sizeof(__le16));
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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,
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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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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\n",
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__func__, rc);
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return rc;
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}
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memcpy(p21, p16, 16);
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rc = E_P24(p21, c8, p24);
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return rc;
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}
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