e678e06bf8
We designed the krb5 context import without completely understanding the context. Now it's clear that there are a number of fields that we ignore, or that we depend on having one single value. In particular, we only support one value of signalg currently; so let's check the signalg field in the downcall (in case we decide there's something else we could support here eventually), but ignore it otherwise. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
135 lines
4.5 KiB
C
135 lines
4.5 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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s32 checksum_type;
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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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checksum_type = CKSUMTYPE_RSA_MD5;
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if (ctx->sealalg != SEAL_ALG_NONE && ctx->sealalg != SEAL_ALG_DES) {
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dprintk("RPC: gss_krb5_seal: ctx->sealalg %d not supported\n",
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ctx->sealalg);
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goto out_err;
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}
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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(checksum_type, krb5_hdr, 8, text, 0, &md5cksum))
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goto out_err;
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if (krb5_encrypt(ctx->seq, NULL, md5cksum.data,
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md5cksum.data, md5cksum.len))
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goto out_err;
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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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goto out_err;
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return ((ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE);
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out_err:
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return GSS_S_FAILURE;
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}
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