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/*
* mle_elt.c: MLE2 policy element (LCP_MLE_ELEMENT2) plugin
*
* Copyright (c) 2014, Intel Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of the Intel Corporation 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 BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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
* COPYRIGHT OWNER 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 <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#define _GNU_SOURCE
#include <getopt.h>
#include <safe_lib.h>
#define PRINT printf
#include "../include/config.h"
#include "../include/hash.h"
#include "../include/uuid.h"
#include "../include/lcp3.h"
#include "polelt_plugin.h"
#include "lcputils.h"
#define MAX_HASHES 32
static uint8_t sinit_min_version;
static unsigned int nr_hashes;
static tb_hash_t hashes[MAX_HASHES];
static char alg_name[32] = "sha1";
static uint16_t alg_type = TPM_ALG_SHA1;
static bool parse_mle_line(const char *line)
{
if ( nr_hashes == MAX_HASHES )
return false;
return parse_line_hashes(line, &hashes[nr_hashes++], alg_type);
}
static bool cmdline_handler(int c, const char *opt)
{
if ( c == 'm' ) {
sinit_min_version = (uint8_t)strtoul(opt, NULL, 0);
LOG("cmdline opt: sinit_min_version: 0x%x\n", sinit_min_version);
return true;
}
else if (c == 'a') {
strlcpy(alg_name, opt,sizeof(alg_name));
alg_type = str_to_hash_alg(alg_name);
LOG("cmdline opt: hash alg: %s\n",alg_name);
return true;
}
else if ( c != 0 ) {
ERROR("Error: unknown option for mle type\n");
return false;
}
/* MLE hash files */
LOG("cmdline opt: mle hash file: %s\n", opt);
if ( !parse_file(opt, parse_mle_line) )
return false;
return true;
}
static lcp_policy_element_t *create(void)
{
LOG("[create]\n");
size_t data_size = sizeof(lcp_mle_element_t2) +
nr_hashes * get_hash_size(alg_type);
lcp_policy_element_t *elt = malloc(sizeof(*elt) + data_size);
if ( elt == NULL ) {
ERROR("Error: failed to allocate element\n");
return NULL;
}
memset_s(elt, sizeof(*elt) + data_size, 0);
elt->size = sizeof(*elt) + data_size;
lcp_mle_element_t2 *mle = (lcp_mle_element_t2 *)&elt->data;
mle->sinit_min_version = sinit_min_version;
mle->hash_alg = alg_type;
mle->num_hashes = nr_hashes;
lcp_hash_t2 *hash = mle->hashes;
for ( unsigned int i = 0; i < nr_hashes; i++ ) {
memcpy_s(hash, get_hash_size(alg_type), &hashes[i], get_hash_size(alg_type));
hash = (void *)hash + get_hash_size(alg_type);
}
LOG("create mle element succeed!\n");
return elt;
}
static void display(const char *prefix, const lcp_policy_element_t *elt)
{
lcp_mle_element_t2 *mle = (lcp_mle_element_t2 *)elt->data;
DISPLAY("%s sinit_min_version: 0x%x\n", prefix, mle->sinit_min_version);
DISPLAY("%s hash_alg: %s\n", prefix, hash_alg_to_str(mle->hash_alg));
DISPLAY("%s num_hashes: %u\n", prefix, mle->num_hashes);
uint8_t *hash = (uint8_t *)&mle->hashes;
unsigned int hash_size = get_hash_size(mle->hash_alg);
for ( unsigned int i = 0; i < mle->num_hashes; i++ ) {
DISPLAY("%s hashes[%u]: ", prefix, i);
print_hex("", hash, hash_size);
hash += hash_size;
}
}
static struct option opts[] = {
{"minver", required_argument, NULL, 'm'},
{"alg", required_argument, NULL, 'a'},
{0, 0, 0, 0}
};
static polelt_plugin_t plugin = {
"mle2",
opts,
" mle2\n"
" Creates current LCP_ELEMENT_MLE2. Supports algorithm agility.\n"
" [--minver <ver>] minimum version of SINIT\n"
" [--alg <sha1|sha256|sha384|sha512>] hash alg of element\n"
" <FILE1> [FILE2] ... one or more files containing MLE\n"
" hash(es); each file can contain\n"
" multiple hashes\n",
LCP_POLELT_TYPE_MLE2,
&cmdline_handler,
&create,
&display
};
REG_POLELT_PLUGIN(&plugin)
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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