107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
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/*
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* linux/net/sunrpc/gss_krb5_seqnum.c
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*
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* Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/util_seqnum.c
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*
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* Copyright (c) 2000 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Andy Adamson <andros@umich.edu>
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*/
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/*
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* Copyright 1993 by OpenVision Technologies, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appears in all copies and
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* that both that copyright notice and this permission notice appear in
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* supporting documentation, and that the name of OpenVision not be used
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* in advertising or publicity pertaining to distribution of the software
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* without specific, written prior permission. OpenVision makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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* OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
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* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <crypto/skcipher.h>
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#include <linux/types.h>
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#include <linux/sunrpc/gss_krb5.h>
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#include "gss_krb5_internal.h"
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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# define RPCDBG_FACILITY RPCDBG_AUTH
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#endif
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s32
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krb5_make_seq_num(struct krb5_ctx *kctx,
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struct crypto_sync_skcipher *key,
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int direction,
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u32 seqnum,
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unsigned char *cksum, unsigned char *buf)
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{
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unsigned char *plain;
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s32 code;
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plain = kmalloc(8, GFP_KERNEL);
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if (!plain)
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return -ENOMEM;
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plain[0] = (unsigned char) (seqnum & 0xff);
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plain[1] = (unsigned char) ((seqnum >> 8) & 0xff);
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plain[2] = (unsigned char) ((seqnum >> 16) & 0xff);
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plain[3] = (unsigned char) ((seqnum >> 24) & 0xff);
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plain[4] = direction;
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plain[5] = direction;
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plain[6] = direction;
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plain[7] = direction;
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code = krb5_encrypt(key, cksum, plain, buf, 8);
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kfree(plain);
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return code;
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}
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s32
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krb5_get_seq_num(struct krb5_ctx *kctx,
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unsigned char *cksum,
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unsigned char *buf,
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int *direction, u32 *seqnum)
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{
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s32 code;
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unsigned char *plain;
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struct crypto_sync_skcipher *key = kctx->seq;
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dprintk("RPC: krb5_get_seq_num:\n");
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plain = kmalloc(8, GFP_KERNEL);
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if (!plain)
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return -ENOMEM;
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if ((code = krb5_decrypt(key, cksum, buf, plain, 8)))
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goto out;
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if ((plain[4] != plain[5]) || (plain[4] != plain[6]) ||
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(plain[4] != plain[7])) {
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code = (s32)KG_BAD_SEQ;
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goto out;
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}
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*direction = plain[4];
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*seqnum = ((plain[0]) |
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(plain[1] << 8) | (plain[2] << 16) | (plain[3] << 24));
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out:
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kfree(plain);
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return code;
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}
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