mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-16 05:50:19 +00:00
fffdaef2eb
Add necessary changes to add kernel support for the rc4-hmac Kerberos encryption type used by Microsoft and described in rfc4757. Signed-off-by: Kevin Coffman <kwc@citi.umich.edu> Signed-off-by: Steve Dickson <steved@redhat.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
227 lines
6.6 KiB
C
227 lines
6.6 KiB
C
/*
|
|
* linux/net/sunrpc/gss_krb5_unseal.c
|
|
*
|
|
* Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5unseal.c
|
|
*
|
|
* Copyright (c) 2000-2008 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/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. */
|
|
|
|
static u32
|
|
gss_verify_mic_v1(struct krb5_ctx *ctx,
|
|
struct xdr_buf *message_buffer, struct xdr_netobj *read_token)
|
|
{
|
|
int signalg;
|
|
int sealalg;
|
|
char cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
|
|
struct xdr_netobj md5cksum = {.len = sizeof(cksumdata),
|
|
.data = cksumdata};
|
|
s32 now;
|
|
int direction;
|
|
u32 seqnum;
|
|
unsigned char *ptr = (unsigned char *)read_token->data;
|
|
int bodysize;
|
|
u8 *cksumkey;
|
|
|
|
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 != ctx->gk5e->signalg)
|
|
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 (ctx->gk5e->keyed_cksum)
|
|
cksumkey = ctx->cksum;
|
|
else
|
|
cksumkey = NULL;
|
|
|
|
if (make_checksum(ctx, ptr, 8, message_buffer, 0,
|
|
cksumkey, KG_USAGE_SIGN, &md5cksum))
|
|
return GSS_S_FAILURE;
|
|
|
|
if (memcmp(md5cksum.data, ptr + GSS_KRB5_TOK_HDR_LEN,
|
|
ctx->gk5e->cksumlength))
|
|
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, 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;
|
|
}
|
|
|
|
static u32
|
|
gss_verify_mic_v2(struct krb5_ctx *ctx,
|
|
struct xdr_buf *message_buffer, struct xdr_netobj *read_token)
|
|
{
|
|
char cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
|
|
struct xdr_netobj cksumobj = {.len = sizeof(cksumdata),
|
|
.data = cksumdata};
|
|
s32 now;
|
|
u64 seqnum;
|
|
u8 *ptr = read_token->data;
|
|
u8 *cksumkey;
|
|
u8 flags;
|
|
int i;
|
|
unsigned int cksum_usage;
|
|
|
|
dprintk("RPC: %s\n", __func__);
|
|
|
|
if (be16_to_cpu(*((__be16 *)ptr)) != KG2_TOK_MIC)
|
|
return GSS_S_DEFECTIVE_TOKEN;
|
|
|
|
flags = ptr[2];
|
|
if ((!ctx->initiate && (flags & KG2_TOKEN_FLAG_SENTBYACCEPTOR)) ||
|
|
(ctx->initiate && !(flags & KG2_TOKEN_FLAG_SENTBYACCEPTOR)))
|
|
return GSS_S_BAD_SIG;
|
|
|
|
if (flags & KG2_TOKEN_FLAG_SEALED) {
|
|
dprintk("%s: token has unexpected sealed flag\n", __func__);
|
|
return GSS_S_FAILURE;
|
|
}
|
|
|
|
for (i = 3; i < 8; i++)
|
|
if (ptr[i] != 0xff)
|
|
return GSS_S_DEFECTIVE_TOKEN;
|
|
|
|
if (ctx->initiate) {
|
|
cksumkey = ctx->acceptor_sign;
|
|
cksum_usage = KG_USAGE_ACCEPTOR_SIGN;
|
|
} else {
|
|
cksumkey = ctx->initiator_sign;
|
|
cksum_usage = KG_USAGE_INITIATOR_SIGN;
|
|
}
|
|
|
|
if (make_checksum_v2(ctx, ptr, GSS_KRB5_TOK_HDR_LEN, message_buffer, 0,
|
|
cksumkey, cksum_usage, &cksumobj))
|
|
return GSS_S_FAILURE;
|
|
|
|
if (memcmp(cksumobj.data, ptr + GSS_KRB5_TOK_HDR_LEN,
|
|
ctx->gk5e->cksumlength))
|
|
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 */
|
|
|
|
seqnum = be64_to_cpup((__be64 *)ptr + 8);
|
|
|
|
return GSS_S_COMPLETE;
|
|
}
|
|
|
|
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;
|
|
|
|
switch (ctx->enctype) {
|
|
default:
|
|
BUG();
|
|
case ENCTYPE_DES_CBC_RAW:
|
|
case ENCTYPE_DES3_CBC_RAW:
|
|
case ENCTYPE_ARCFOUR_HMAC:
|
|
return gss_verify_mic_v1(ctx, message_buffer, read_token);
|
|
case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
|
|
case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
|
|
return gss_verify_mic_v2(ctx, message_buffer, read_token);
|
|
}
|
|
}
|
|
|