cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

gss_krb5_seqnum.c (2911B)

      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.
     14 *
     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.
     24 *
     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 <crypto/skcipher.h>
     35#include <linux/types.h>
     36#include <linux/sunrpc/gss_krb5.h>
     37
     38#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
     39# define RPCDBG_FACILITY        RPCDBG_AUTH
     40#endif
     41
     42s32
     43krb5_make_seq_num(struct krb5_ctx *kctx,
     44		struct crypto_sync_skcipher *key,
     45		int direction,
     46		u32 seqnum,
     47		unsigned char *cksum, unsigned char *buf)
     48{
     49	unsigned char *plain;
     50	s32 code;
     51
     52	plain = kmalloc(8, GFP_KERNEL);
     53	if (!plain)
     54		return -ENOMEM;
     55
     56	plain[0] = (unsigned char) (seqnum & 0xff);
     57	plain[1] = (unsigned char) ((seqnum >> 8) & 0xff);
     58	plain[2] = (unsigned char) ((seqnum >> 16) & 0xff);
     59	plain[3] = (unsigned char) ((seqnum >> 24) & 0xff);
     60
     61	plain[4] = direction;
     62	plain[5] = direction;
     63	plain[6] = direction;
     64	plain[7] = direction;
     65
     66	code = krb5_encrypt(key, cksum, plain, buf, 8);
     67	kfree(plain);
     68	return code;
     69}
     70
     71s32
     72krb5_get_seq_num(struct krb5_ctx *kctx,
     73	       unsigned char *cksum,
     74	       unsigned char *buf,
     75	       int *direction, u32 *seqnum)
     76{
     77	s32 code;
     78	unsigned char *plain;
     79	struct crypto_sync_skcipher *key = kctx->seq;
     80
     81	dprintk("RPC:       krb5_get_seq_num:\n");
     82
     83	plain = kmalloc(8, GFP_KERNEL);
     84	if (!plain)
     85		return -ENOMEM;
     86
     87	if ((code = krb5_decrypt(key, cksum, buf, plain, 8)))
     88		goto out;
     89
     90	if ((plain[4] != plain[5]) || (plain[4] != plain[6]) ||
     91	    (plain[4] != plain[7])) {
     92		code = (s32)KG_BAD_SEQ;
     93		goto out;
     94	}
     95
     96	*direction = plain[4];
     97
     98	*seqnum = ((plain[0]) |
     99		   (plain[1] << 8) | (plain[2] << 16) | (plain[3] << 24));
    100
    101out:
    102	kfree(plain);
    103	return code;
    104}