d00953a53e
cleanup: Document token header size with a #define instead of open-coding it. Don't needlessly increment "ptr" past the beginning of the header which makes the values passed to functions more understandable and eliminates the need for extra "krb5_hdr" pointer. Clean up some intersecting white-space issues flagged by checkpatch.pl. This leaves the checksum length hard-coded at 8 for DES. A later patch cleans that up. Signed-off-by: Kevin Coffman <kwc@citi.umich.edu> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
139 lines
4.6 KiB
C
139 lines
4.6 KiB
C
/*
|
|
* linux/net/sunrpc/gss_krb5_unseal.c
|
|
*
|
|
* Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5unseal.c
|
|
*
|
|
* Copyright (c) 2000 The Regents of the University of Michigan.
|
|
* All rights reserved.
|
|
*
|
|
* Andy Adamson <andros@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/crypto.h>
|
|
|
|
#ifdef RPC_DEBUG
|
|
# define RPCDBG_FACILITY RPCDBG_AUTH
|
|
#endif
|
|
|
|
|
|
/* read_token is a mic token, and message_buffer is the data that the mic was
|
|
* supposedly taken over. */
|
|
|
|
u32
|
|
gss_verify_mic_kerberos(struct gss_ctx *gss_ctx,
|
|
struct xdr_buf *message_buffer, struct xdr_netobj *read_token)
|
|
{
|
|
struct krb5_ctx *ctx = gss_ctx->internal_ctx_id;
|
|
int signalg;
|
|
int sealalg;
|
|
char cksumdata[16];
|
|
struct xdr_netobj md5cksum = {.len = 0, .data = cksumdata};
|
|
s32 now;
|
|
int direction;
|
|
u32 seqnum;
|
|
unsigned char *ptr = (unsigned char *)read_token->data;
|
|
int bodysize;
|
|
|
|
dprintk("RPC: krb5_read_token\n");
|
|
|
|
if (g_verify_token_header(&ctx->mech_used, &bodysize, &ptr,
|
|
read_token->len))
|
|
return GSS_S_DEFECTIVE_TOKEN;
|
|
|
|
if ((ptr[0] != ((KG_TOK_MIC_MSG >> 8) & 0xff)) ||
|
|
(ptr[1] != (KG_TOK_MIC_MSG & 0xff)))
|
|
return GSS_S_DEFECTIVE_TOKEN;
|
|
|
|
/* XXX sanity-check bodysize?? */
|
|
|
|
signalg = ptr[2] + (ptr[3] << 8);
|
|
if (signalg != SGN_ALG_DES_MAC_MD5)
|
|
return GSS_S_DEFECTIVE_TOKEN;
|
|
|
|
sealalg = ptr[4] + (ptr[5] << 8);
|
|
if (sealalg != SEAL_ALG_NONE)
|
|
return GSS_S_DEFECTIVE_TOKEN;
|
|
|
|
if ((ptr[6] != 0xff) || (ptr[7] != 0xff))
|
|
return GSS_S_DEFECTIVE_TOKEN;
|
|
|
|
if (make_checksum("md5", ptr, 8, message_buffer, 0, &md5cksum))
|
|
return GSS_S_FAILURE;
|
|
|
|
if (krb5_encrypt(ctx->seq, NULL, md5cksum.data, md5cksum.data, 16))
|
|
return GSS_S_FAILURE;
|
|
|
|
if (memcmp(md5cksum.data + 8, ptr + GSS_KRB5_TOK_HDR_LEN, 8))
|
|
return GSS_S_BAD_SIG;
|
|
|
|
/* it got through unscathed. Make sure the context is unexpired */
|
|
|
|
now = get_seconds();
|
|
|
|
if (now > ctx->endtime)
|
|
return GSS_S_CONTEXT_EXPIRED;
|
|
|
|
/* do sequencing checks */
|
|
|
|
if (krb5_get_seq_num(ctx->seq, ptr + GSS_KRB5_TOK_HDR_LEN, ptr + 8, &direction, &seqnum))
|
|
return GSS_S_FAILURE;
|
|
|
|
if ((ctx->initiate && direction != 0xff) ||
|
|
(!ctx->initiate && direction != 0))
|
|
return GSS_S_BAD_SIG;
|
|
|
|
return GSS_S_COMPLETE;
|
|
}
|