134 lines
4.3 KiB
C
134 lines
4.3 KiB
C
/*
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* linux/net/sunrpc/gss_krb5_seal.c
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*
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* Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5seal.c
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*
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* Copyright (c) 2000-2008 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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* J. Bruce Fields <bfields@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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/*
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* Copyright (C) 1998 by the FundsXpress, INC.
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*
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* All rights reserved.
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*
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* Export of this software from the United States of America may require
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* a specific license from the United States Government. It is the
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* responsibility of any person or organization contemplating export to
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* obtain such a license before exporting.
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*
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* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
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* distribute this software and its documentation for any purpose and
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* without fee is hereby granted, provided that the above copyright
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* notice appear in all copies and that both that copyright notice and
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* this permission notice appear in supporting documentation, and that
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* the name of FundsXpress. not be used in advertising or publicity pertaining
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* to distribution of the software without specific, written prior
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* permission. FundsXpress makes no representations about the suitability of
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* this software for any purpose. It is provided "as is" without express
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* or implied warranty.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#include <linux/types.h>
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#include <linux/jiffies.h>
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#include <linux/sunrpc/gss_krb5.h>
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#include <linux/random.h>
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#include <linux/crypto.h>
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#include <linux/atomic.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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static void *
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setup_token_v2(struct krb5_ctx *ctx, struct xdr_netobj *token)
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{
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u16 *ptr;
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void *krb5_hdr;
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u8 *p, flags = 0x00;
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if ((ctx->flags & KRB5_CTX_FLAG_INITIATOR) == 0)
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flags |= 0x01;
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if (ctx->flags & KRB5_CTX_FLAG_ACCEPTOR_SUBKEY)
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flags |= 0x04;
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/* Per rfc 4121, sec 4.2.6.1, there is no header,
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* just start the token.
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*/
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krb5_hdr = (u16 *)token->data;
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ptr = krb5_hdr;
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*ptr++ = KG2_TOK_MIC;
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p = (u8 *)ptr;
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*p++ = flags;
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*p++ = 0xff;
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ptr = (u16 *)p;
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*ptr++ = 0xffff;
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*ptr = 0xffff;
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token->len = GSS_KRB5_TOK_HDR_LEN + ctx->gk5e->cksumlength;
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return krb5_hdr;
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}
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u32
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gss_krb5_get_mic_v2(struct krb5_ctx *ctx, struct xdr_buf *text,
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struct xdr_netobj *token)
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{
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struct crypto_ahash *tfm = ctx->initiate ?
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ctx->initiator_sign : ctx->acceptor_sign;
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struct xdr_netobj cksumobj = {
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.len = ctx->gk5e->cksumlength,
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};
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__be64 seq_send_be64;
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void *krb5_hdr;
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time64_t now;
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dprintk("RPC: %s\n", __func__);
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krb5_hdr = setup_token_v2(ctx, token);
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/* Set up the sequence number. Now 64-bits in clear
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* text and w/o direction indicator */
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seq_send_be64 = cpu_to_be64(atomic64_fetch_inc(&ctx->seq_send64));
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memcpy(krb5_hdr + 8, (char *) &seq_send_be64, 8);
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cksumobj.data = krb5_hdr + GSS_KRB5_TOK_HDR_LEN;
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if (gss_krb5_checksum(tfm, krb5_hdr, GSS_KRB5_TOK_HDR_LEN,
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text, 0, &cksumobj))
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return GSS_S_FAILURE;
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now = ktime_get_real_seconds();
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return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE;
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}
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