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/*
* linux/net/sunrpc/gss_krb5_seal.c
*
* Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5seal.c
*
* Copyright (c) 2000 The Regents of the University of Michigan.
* All rights reserved.
*
* Andy Adamson <andros@umich.edu>
* J. Bruce Fields <bfields@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/random.h>
#include <asm/scatterlist.h>
#include <linux/crypto.h>
#ifdef RPC_DEBUG
# define RPCDBG_FACILITY RPCDBG_AUTH
#endif
static inline int
gss_krb5_padding(int blocksize, int length) {
/* Most of the code is block-size independent but in practice we
* use only 8: */
BUG_ON(blocksize != 8);
return 8 - (length & 7);
}
u32
krb5_make_token(struct krb5_ctx *ctx, int qop_req,
struct xdr_buf *text, struct xdr_netobj *token,
int toktype)
{
s32 checksum_type;
struct xdr_netobj md5cksum = {.len = 0, .data = NULL};
int blocksize = 0, tmsglen;
unsigned char *ptr, *krb5_hdr, *msg_start;
s32 now;
dprintk("RPC: gss_krb5_seal\n");
now = get_seconds();
if (qop_req != 0)
goto out_err;
switch (ctx->signalg) {
case SGN_ALG_DES_MAC_MD5:
checksum_type = CKSUMTYPE_RSA_MD5;
break;
default:
dprintk("RPC: gss_krb5_seal: ctx->signalg %d not"
" supported\n", ctx->signalg);
goto out_err;
}
if (ctx->sealalg != SEAL_ALG_NONE && ctx->sealalg != SEAL_ALG_DES) {
dprintk("RPC: gss_krb5_seal: ctx->sealalg %d not supported\n",
ctx->sealalg);
goto out_err;
}
if (toktype == KG_TOK_WRAP_MSG) {
blocksize = crypto_tfm_alg_blocksize(ctx->enc);
tmsglen = blocksize + text->len
+ gss_krb5_padding(blocksize, blocksize + text->len);
} else {
tmsglen = 0;
}
token->len = g_token_size(&ctx->mech_used, 22 + tmsglen);
ptr = token->data;
g_make_token_header(&ctx->mech_used, 22 + tmsglen, &ptr);
*ptr++ = (unsigned char) ((toktype>>8)&0xff);
*ptr++ = (unsigned char) (toktype&0xff);
/* ptr now at byte 2 of header described in rfc 1964, section 1.2.1: */
krb5_hdr = ptr - 2;
msg_start = krb5_hdr + 24;
*(u16 *)(krb5_hdr + 2) = htons(ctx->signalg);
memset(krb5_hdr + 4, 0xff, 4);
if (toktype == KG_TOK_WRAP_MSG)
*(u16 *)(krb5_hdr + 4) = htons(ctx->sealalg);
if (toktype == KG_TOK_WRAP_MSG) {
/* XXX removing support for now */
goto out_err;
} else { /* Sign only. */
if (make_checksum(checksum_type, krb5_hdr, 8, text,
&md5cksum))
goto out_err;
}
switch (ctx->signalg) {
case SGN_ALG_DES_MAC_MD5:
if (krb5_encrypt(ctx->seq, NULL, md5cksum.data,
md5cksum.data, md5cksum.len))
goto out_err;
memcpy(krb5_hdr + 16,
md5cksum.data + md5cksum.len - KRB5_CKSUM_LENGTH,
KRB5_CKSUM_LENGTH);
dprintk("RPC: make_seal_token: cksum data: \n");
print_hexl((u32 *) (krb5_hdr + 16), KRB5_CKSUM_LENGTH, 0);
break;
default:
BUG();
}
kfree(md5cksum.data);
if ((krb5_make_seq_num(ctx->seq, ctx->initiate ? 0 : 0xff,
ctx->seq_send, krb5_hdr + 16, krb5_hdr + 8)))
goto out_err;
ctx->seq_send++;
return ((ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE);
out_err:
if (md5cksum.data) kfree(md5cksum.data);
return GSS_S_FAILURE;
}
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