Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 *  linux/net/sunrpc/gss_krb5_seal.c

 *

 *  Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5seal.c

 *

 *  Copyright (c) 2000 The Regents of the University of Michigan.

 *  All rights reserved.

 *

 *  Andy Adamson        <andros@umich.edu>

 *  J. Bruce Fields     <bfields@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.

 */

/*

 * Copyright (C) 1998 by the FundsXpress, INC.

 *

 * All rights reserved.

 *

 * Export of this software from the United States of America may require

 * a specific license from the United States Government.  It is the

 * responsibility of any person or organization contemplating export to

 * obtain such a license before exporting.

 *

 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and

 * distribute this software and its documentation for any purpose and

 * without fee is hereby granted, provided that the above copyright

 * notice appear in all copies and that both that copyright notice and

 * this permission notice appear in supporting documentation, and that

 * the name of FundsXpress. not be used in advertising or publicity pertaining

 * to distribution of the software without specific, written prior

 * permission.  FundsXpress makes no representations about the suitability of

 * this software for any purpose.  It is provided "as is" without express

 * or implied warranty.

 *

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED

 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.

 */

#include <linux/types.h>

#include <linux/slab.h>

#include <linux/jiffies.h>

#include <linux/sunrpc/gss_krb5.h>

#include <linux/random.h>

#include <linux/crypto.h>

#ifdef RPC_DEBUG

# define RPCDBG_FACILITY        RPCDBG_AUTH

#endif

DEFINE_SPINLOCK(krb5_seq_lock);

u32

gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text,

                struct xdr_netobj *token)

{

        struct krb5_ctx         *ctx = gss_ctx->internal_ctx_id;

        char                    cksumdata[16];

        struct xdr_netobj       md5cksum = {.len = 0, .data = cksumdata};

        unsigned char           *ptr, *krb5_hdr, *msg_start;

        s32                     now;

        u32                     seq_send;

        dprintk("RPC:       gss_krb5_seal\n");

        BUG_ON(ctx == NULL);

        now = get_seconds();

        token->len = g_token_size(&ctx->mech_used, 22);

        ptr = token->data;

        g_make_token_header(&ctx->mech_used, 22, &ptr);

        *ptr++ = (unsigned char) ((KG_TOK_MIC_MSG>>8)&0xff);

        *ptr++ = (unsigned char) (KG_TOK_MIC_MSG&0xff);

        /* ptr now at byte 2 of header described in rfc 1964, section 1.2.1: */

        krb5_hdr = ptr - 2;

        msg_start = krb5_hdr + 24;

        *(__be16 *)(krb5_hdr + 2) = htons(SGN_ALG_DES_MAC_MD5);

        memset(krb5_hdr + 4, 0xff, 4);

        if (make_checksum("md5", krb5_hdr, 8, text, 0, &md5cksum))

                return GSS_S_FAILURE;

        if (krb5_encrypt(ctx->seq, NULL, md5cksum.data,

                          md5cksum.data, md5cksum.len))

                return GSS_S_FAILURE;

        memcpy(krb5_hdr + 16, md5cksum.data + md5cksum.len - KRB5_CKSUM_LENGTH,

               KRB5_CKSUM_LENGTH);

        spin_lock(&krb5_seq_lock);

        seq_send = ctx->seq_send++;

        spin_unlock(&krb5_seq_lock);

        if (krb5_make_seq_num(ctx->seq, ctx->initiate ? 0 : 0xff,

                               ctx->seq_send, krb5_hdr + 16, krb5_hdr + 8))

                return GSS_S_FAILURE;

        return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE;

}