[linux-block.git] / net / sunrpc / auth_gss / gss_krb5_seqnum.c

/*
 *  linux/net/sunrpc/gss_krb5_seqnum.c
 *
 *  Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/util_seqnum.c
 *
 *  Copyright (c) 2000 The Regents of the University of Michigan.
 *  All rights reserved.
 *
 *  Andy Adamson   <andros@umich.edu>
 */

/*
 * Copyright 1993 by OpenVision Technologies, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appears in all copies and
 * that both that copyright notice and this permission notice appear in
 * supporting documentation, and that the name of OpenVision not be used
 * in advertising or publicity pertaining to distribution of the software
 * without specific, written prior permission. OpenVision makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/types.h>
#include <linux/sunrpc/gss_krb5.h>
#include <linux/crypto.h>

#ifdef RPC_DEBUG
# define RPCDBG_FACILITY        RPCDBG_AUTH
#endif

s32
krb5_make_seq_num(struct crypto_blkcipher *key,
		int direction,
		u32 seqnum,
		unsigned char *cksum, unsigned char *buf)
{
	unsigned char plain[8];

	plain[0] = (unsigned char) (seqnum & 0xff);
	plain[1] = (unsigned char) ((seqnum >> 8) & 0xff);
	plain[2] = (unsigned char) ((seqnum >> 16) & 0xff);
	plain[3] = (unsigned char) ((seqnum >> 24) & 0xff);

	plain[4] = direction;
	plain[5] = direction;
	plain[6] = direction;
	plain[7] = direction;

	return krb5_encrypt(key, cksum, plain, buf, 8);
}

s32
krb5_get_seq_num(struct crypto_blkcipher *key,
	       unsigned char *cksum,
	       unsigned char *buf,
	       int *direction, u32 *seqnum)
{
	s32 code;
	unsigned char plain[8];

	dprintk("RPC:       krb5_get_seq_num:\n");

	if ((code = krb5_decrypt(key, cksum, buf, plain, 8)))
		return code;

	if ((plain[4] != plain[5]) || (plain[4] != plain[6]) ||
	    (plain[4] != plain[7]))
		return (s32)KG_BAD_SEQ;

	*direction = plain[4];

	*seqnum = ((plain[0]) |
		   (plain[1] << 8) | (plain[2] << 16) | (plain[3] << 24));

	return (0);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/net/sunrpc/gss_krb5_seqnum.c
	3	*
	4	* Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/util_seqnum.c
	5	*
	6	* Copyright (c) 2000 The Regents of the University of Michigan.
	7	* All rights reserved.
	8	*
	9	* Andy Adamson <andros@umich.edu>
	10	*/
	11
	12	/*
	13	* Copyright 1993 by OpenVision Technologies, Inc.
cca5172a	14	*
1da177e4 LT	15	* Permission to use, copy, modify, distribute, and sell this software
	16	* and its documentation for any purpose is hereby granted without fee,
	17	* provided that the above copyright notice appears in all copies and
	18	* that both that copyright notice and this permission notice appear in
	19	* supporting documentation, and that the name of OpenVision not be used
	20	* in advertising or publicity pertaining to distribution of the software
	21	* without specific, written prior permission. OpenVision makes no
	22	* representations about the suitability of this software for any
	23	* purpose. It is provided "as is" without express or implied warranty.
cca5172a	24	*
1da177e4 LT	25	* OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
	26	* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
	27	* EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
	28	* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
	29	* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
	30	* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
	31	* PERFORMANCE OF THIS SOFTWARE.
	32	*/
	33
	34	#include <linux/types.h>
1da177e4 LT	35	#include <linux/sunrpc/gss_krb5.h>
	36	#include <linux/crypto.h>
	37
	38	#ifdef RPC_DEBUG
	39	# define RPCDBG_FACILITY RPCDBG_AUTH
	40	#endif
	41
	42	s32
378c6697	43	krb5_make_seq_num(struct crypto_blkcipher *key,
1da177e4	44	int direction,
5743d65c	45	u32 seqnum,
1da177e4 LT	46	unsigned char cksum, unsigned char buf)
	47	{
	48	unsigned char plain[8];
	49
	50	plain[0] = (unsigned char) (seqnum & 0xff);
	51	plain[1] = (unsigned char) ((seqnum >> 8) & 0xff);
	52	plain[2] = (unsigned char) ((seqnum >> 16) & 0xff);
	53	plain[3] = (unsigned char) ((seqnum >> 24) & 0xff);
	54
	55	plain[4] = direction;
	56	plain[5] = direction;
	57	plain[6] = direction;
	58	plain[7] = direction;
	59
	60	return krb5_encrypt(key, cksum, plain, buf, 8);
	61	}
	62
	63	s32
378c6697	64	krb5_get_seq_num(struct crypto_blkcipher *key,
1da177e4 LT	65	unsigned char *cksum,
1da177e4 LT	66	unsigned char *buf,
5743d65c	67	int direction, u32 seqnum)
1da177e4 LT	68	{
	69	s32 code;
	70	unsigned char plain[8];
	71
8885cb36	72	dprintk("RPC: krb5_get_seq_num:\n");
1da177e4 LT	73
	74	if ((code = krb5_decrypt(key, cksum, buf, plain, 8)))
	75	return code;
	76
f64f9e71 JP	77	if ((plain[4] != plain[5]) \|\| (plain[4] != plain[6]) \|\|
f64f9e71 JP	78	(plain[4] != plain[7]))
1da177e4 LT	79	return (s32)KG_BAD_SEQ;
	80
	81	*direction = plain[4];
	82
	83	*seqnum = ((plain[0]) \|
	84	(plain[1] << 8) \| (plain[2] << 16) \| (plain[3] << 24));
	85
	86	return (0);
	87	}