1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
129 lines
3.9 KiB
C
129 lines
3.9 KiB
C
/*
|
|
* linux/net/sunrpc/gss_spkm3_unseal.c
|
|
*
|
|
* Copyright (c) 2003 The Regents of the University of Michigan.
|
|
* All rights reserved.
|
|
*
|
|
* Andy Adamson <andros@umich.edu>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
|
|
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/sunrpc/gss_spkm3.h>
|
|
#include <linux/crypto.h>
|
|
|
|
#ifdef RPC_DEBUG
|
|
# define RPCDBG_FACILITY RPCDBG_AUTH
|
|
#endif
|
|
|
|
/*
|
|
* spkm3_read_token()
|
|
*
|
|
* only SPKM_MIC_TOK with md5 intg-alg is supported
|
|
*/
|
|
u32
|
|
spkm3_read_token(struct spkm3_ctx *ctx,
|
|
struct xdr_netobj *read_token, /* checksum */
|
|
struct xdr_buf *message_buffer, /* signbuf */
|
|
int *qop_state, int toktype)
|
|
{
|
|
s32 code;
|
|
struct xdr_netobj wire_cksum = {.len =0, .data = NULL};
|
|
struct xdr_netobj md5cksum = {.len = 0, .data = NULL};
|
|
unsigned char *ptr = (unsigned char *)read_token->data;
|
|
unsigned char *cksum;
|
|
int bodysize, md5elen;
|
|
int mic_hdrlen;
|
|
u32 ret = GSS_S_DEFECTIVE_TOKEN;
|
|
|
|
dprintk("RPC: spkm3_read_token read_token->len %d\n", read_token->len);
|
|
|
|
if (g_verify_token_header((struct xdr_netobj *) &ctx->mech_used,
|
|
&bodysize, &ptr, read_token->len))
|
|
goto out;
|
|
|
|
/* decode the token */
|
|
|
|
if (toktype == SPKM_MIC_TOK) {
|
|
|
|
if ((ret = spkm3_verify_mic_token(&ptr, &mic_hdrlen, &cksum)))
|
|
goto out;
|
|
|
|
if (*cksum++ != 0x03) {
|
|
dprintk("RPC: spkm3_read_token BAD checksum type\n");
|
|
goto out;
|
|
}
|
|
md5elen = *cksum++;
|
|
cksum++; /* move past the zbit */
|
|
|
|
if(!decode_asn1_bitstring(&wire_cksum, cksum, md5elen - 1, 16))
|
|
goto out;
|
|
|
|
/* HARD CODED FOR MD5 */
|
|
|
|
/* compute the checksum of the message.
|
|
* ptr + 2 = start of header piece of checksum
|
|
* mic_hdrlen + 2 = length of header piece of checksum
|
|
*/
|
|
ret = GSS_S_DEFECTIVE_TOKEN;
|
|
code = make_checksum(CKSUMTYPE_RSA_MD5, ptr + 2,
|
|
mic_hdrlen + 2,
|
|
message_buffer, &md5cksum);
|
|
|
|
if (code)
|
|
goto out;
|
|
|
|
dprintk("RPC: spkm3_read_token: digest wire_cksum.len %d:\n",
|
|
wire_cksum.len);
|
|
dprintk(" md5cksum.data\n");
|
|
print_hexl((u32 *) md5cksum.data, 16, 0);
|
|
dprintk(" cksum.data:\n");
|
|
print_hexl((u32 *) wire_cksum.data, wire_cksum.len, 0);
|
|
|
|
ret = GSS_S_BAD_SIG;
|
|
code = memcmp(md5cksum.data, wire_cksum.data, wire_cksum.len);
|
|
if (code)
|
|
goto out;
|
|
|
|
} else {
|
|
dprintk("RPC: BAD or UNSUPPORTED SPKM3 token type: %d\n",toktype);
|
|
goto out;
|
|
}
|
|
|
|
/* XXX: need to add expiration and sequencing */
|
|
ret = GSS_S_COMPLETE;
|
|
out:
|
|
if (md5cksum.data)
|
|
kfree(md5cksum.data);
|
|
if (wire_cksum.data)
|
|
kfree(wire_cksum.data);
|
|
return ret;
|
|
}
|