1 files changed, 249 insertions, 0 deletions
diff --git a/fs/cifs/smbencrypt.c b/fs/cifs/smbencrypt.c
new file mode 100644
index 000000000..a4232ec4f
--- /dev/null
+++ b/fs/cifs/smbencrypt.c
@@ -0,0 +1,249 @@
+/*
+   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/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);
+}
+
+static int
+smbhash(unsigned char *out, const unsigned char *in, unsigned char *key)
+{
+	int rc;
+	unsigned char key2[8];
+	struct crypto_blkcipher *tfm_des;
+	struct scatterlist sgin, sgout;
+	struct blkcipher_desc desc;
+
+	str_to_key(key, key2);
+
+	tfm_des = crypto_alloc_blkcipher("ecb(des)", 0, CRYPTO_ALG_ASYNC);
+	if (IS_ERR(tfm_des)) {
+		rc = PTR_ERR(tfm_des);
+		cifs_dbg(VFS, "could not allocate des crypto API\n");
+		goto smbhash_err;
+	}
+
+	desc.tfm = tfm_des;
+
+	crypto_blkcipher_setkey(tfm_des, key2, 8);
+
+	sg_init_one(&sgin, in, 8);
+	sg_init_one(&sgout, out, 8);
+
+	rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, 8);
+	if (rc)
+		cifs_dbg(VFS, "could not encrypt crypt key rc: %d\n", rc);
+
+	crypto_free_blkcipher(tfm_des);
+smbhash_err:
+	return rc;
+}
+
+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;
+}
+
+/* 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;
+}
+
+/*
+   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;
+}
+
+/*
+ * 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;
+}
+
+/* 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;
+}