d922a84a8b
The sealalg is checked in several places, giving the impression it could be either SEAL_ALG_NONE or SEAL_ALG_DES. But in fact SEAL_ALG_NONE seems to be sufficient only for making mic's, and all the contexts we get must be capable of wrapping as well. So the sealalg must be SEAL_ALG_DES. As with signalg, just check for the right value on the downcall and ignore it otherwise. Similarly, tighten expectations for the sealalg on incoming tokens, in case we do support other values eventually. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
125 lines
4.3 KiB
C
125 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 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/slab.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 <asm/scatterlist.h>
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#include <linux/crypto.h>
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#ifdef RPC_DEBUG
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# define RPCDBG_FACILITY RPCDBG_AUTH
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#endif
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DEFINE_SPINLOCK(krb5_seq_lock);
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u32
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gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text,
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struct xdr_netobj *token)
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{
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struct krb5_ctx *ctx = gss_ctx->internal_ctx_id;
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char cksumdata[16];
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struct xdr_netobj md5cksum = {.len = 0, .data = cksumdata};
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unsigned char *ptr, *krb5_hdr, *msg_start;
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s32 now;
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u32 seq_send;
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dprintk("RPC: gss_krb5_seal\n");
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now = get_seconds();
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token->len = g_token_size(&ctx->mech_used, 22);
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ptr = token->data;
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g_make_token_header(&ctx->mech_used, 22, &ptr);
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*ptr++ = (unsigned char) ((KG_TOK_MIC_MSG>>8)&0xff);
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*ptr++ = (unsigned char) (KG_TOK_MIC_MSG&0xff);
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/* ptr now at byte 2 of header described in rfc 1964, section 1.2.1: */
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krb5_hdr = ptr - 2;
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msg_start = krb5_hdr + 24;
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*(__be16 *)(krb5_hdr + 2) = htons(SGN_ALG_DES_MAC_MD5);
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memset(krb5_hdr + 4, 0xff, 4);
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if (make_checksum("md5", krb5_hdr, 8, text, 0, &md5cksum))
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return GSS_S_FAILURE;
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if (krb5_encrypt(ctx->seq, NULL, md5cksum.data,
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md5cksum.data, md5cksum.len))
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return GSS_S_FAILURE;
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memcpy(krb5_hdr + 16,
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md5cksum.data + md5cksum.len - KRB5_CKSUM_LENGTH,
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KRB5_CKSUM_LENGTH);
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spin_lock(&krb5_seq_lock);
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seq_send = ctx->seq_send++;
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spin_unlock(&krb5_seq_lock);
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if ((krb5_make_seq_num(ctx->seq, ctx->initiate ? 0 : 0xff,
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seq_send, krb5_hdr + 16, krb5_hdr + 8)))
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return GSS_S_FAILURE;
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return ((ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE);
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}
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