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/*
* pol.c:
*
* 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 <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <safe_lib.h>
#include <snprintf_s.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 "pol.h"
#include "lcputils.h"
size_t get_policy_size(const lcp_policy_t2 *pol)
{
return offsetof(lcp_policy_t2, policy_hash) +
get_lcp_hash_size(pol->hash_alg);
}
bool verify_legacy_policy(const lcp_policy_t *pol, size_t size)
{
LOG("[verify_legacy_policy]");
size_t expected_size = offsetof(lcp_policy_t, policy_hash) + SHA1_DIGEST_SIZE;
if (size != expected_size) {
ERROR("Error: incorrect policy size. Expected %d.\n", expected_size);
return false;
}
if (pol->version > LCP_VER_2_4 || pol->version < LCP_VER_2_0) {
ERROR("Error: policy version incorrect.\n");
return false;
}
if (pol->hash_alg != LCP_POLHALG_SHA1) { //Legacy value for TPM 1.2
ERROR("Error: policy hash alg incorrect.\n");
return false;
}
if (pol->policy_type != LCP_POLTYPE_ANY && pol->policy_type != LCP_POLTYPE_LIST) {
ERROR("Error: policy type incorrect.\n");
return false;
}
if ( pol->reserved1 != 0 || pol->reserved2 != 0 ||
pol->reserved3 != 0 || pol->reserved4 != 0 ) {
ERROR("Error: one of reserved fields not 0.\n");
return false;
}
LOG("verify policy succeed!\n");
return true;
}
bool verify_policy(const lcp_policy_t2 *pol, size_t size, bool silent)
{
LOG("[verify_policy]\n");
if ( get_policy_size(pol) > size ) {
if ( !silent ) ERROR("Error: policy too big\n");
return false;
}
if ( pol->version < LCP_DEFAULT_POLICY_VERSION ||
MAJOR_VER(pol->version) != MAJOR_VER(LCP_DEFAULT_POLICY_VERSION) ) {
if ( !silent ) ERROR("Error: invalid policy version: 0x%x\n",
pol->version);
return false;
}
if ( !get_lcp_hash_size(pol->hash_alg) ) {
if ( !silent ) ERROR("Error: invalid policy hash alg: %u\n",
pol->hash_alg);
return false;
}
if ( pol->policy_type != LCP_POLTYPE_ANY &&
pol->policy_type != LCP_POLTYPE_LIST ) {
if ( !silent ) ERROR("Error: invlaid policy type: %u\n",
pol->policy_type);
return false;
}
if ( pol->reserved2!= 0 ) {
if ( !silent ) ERROR("Error: reserved fields not 0: %u\n",
pol->reserved2);
return false;
}
LOG("verify policy succeed!\n");
return true;
}
void display_legacy_policy(const char *prefix, const lcp_policy_t *pol)
{
if (pol == NULL) {
return;
}
DISPLAY("%s version: 0x%x\n", prefix, pol->version);
DISPLAY("%s hash_alg: 0x%x (%s)\n", prefix, pol->hash_alg, hash_alg_to_str(pol->hash_alg));
DISPLAY("%s policy_type: %s\n", prefix, policy_type_to_str(pol->policy_type));
DISPLAY("%s sinit_min_version: 0x%x\n", prefix, pol->sinit_min_version);
DISPLAY("%s data_revocation_counters: ", prefix);
for ( unsigned int i = 0; i < LCP_MAX_LISTS; i++ )
DISPLAY("%u, ", pol->data_revocation_counters[i]);
DISPLAY("\n");
DISPLAY("%s policy_control: 0x%x\n", prefix, pol->policy_control);
DISPLAY("%s max_sinit_min_ver: 0x%x\n", prefix, pol->max_sinit_min_version);
if (pol->version < LCP_VER_2_4) {
DISPLAY("%s max_biosac_min_ver: 0x%x\n", prefix, pol->reserved2);
}
DISPLAY("%s policy_hash: ", prefix);
print_hex("", &pol->policy_hash, SHA1_DIGEST_SIZE);
}
void display_policy(const char *prefix, const lcp_policy_t2 *pol, bool brief)
{
(void)brief; /* quiet compiler warning portbly */
if ( pol == NULL )
return;
if ( prefix == NULL )
prefix = "";
DISPLAY("%s version: 0x%x\n", prefix, pol->version);
DISPLAY("%s hash_alg: 0x%x (%s)\n", prefix, pol->hash_alg, hash_alg_to_str(pol->hash_alg));
DISPLAY("%s policy_type: %s\n", prefix, policy_type_to_str(pol->policy_type));
DISPLAY("%s sinit_min_version: 0x%x\n", prefix, pol->sinit_min_version);
DISPLAY("%s data_revocation_counters: ", prefix);
for ( unsigned int i = 0; i < ARRAY_SIZE(pol->data_revocation_counters); i++ )
DISPLAY("%u, ", pol->data_revocation_counters[i]);
DISPLAY("\n");
DISPLAY("%s policy_control: 0x%x\n", prefix, pol->policy_control);
DISPLAY("%s max_sinit_min_ver: 0x%x\n", prefix, pol->max_sinit_min_ver);
if (pol->version == LCP_VER_3_0) {
DISPLAY("%s max_biosac_min_ver: 0x%x\n", prefix, pol->max_biosac_min_ver);
}
else {
DISPLAY("%s reserved: 0x%x\n", prefix, pol->max_biosac_min_ver);
}
DISPLAY("%s lcp_hash_alg_mask: 0x%x\n", prefix, pol->lcp_hash_alg_mask);
DISPLAY("%s lcp_sign_alg_mask: 0x%x\n", prefix, pol->lcp_sign_alg_mask);
if (pol->version == LCP_VER_3_0) {
DISPLAY("%s aux_hash_alg_mask: 0x%x\n", prefix, pol->aux_hash_alg_mask);
}
else {
DISPLAY("%s reserved2: 0x%x\n", prefix, pol->aux_hash_alg_mask);
}
DISPLAY("%s policy_hash: ", prefix);
print_hex("", &pol->policy_hash, get_lcp_hash_size(pol->hash_alg));
}
const char *policy_type_to_str(uint8_t type)
{
static const char *types[] = { "list", "any" };
static char buf[32] = "";
if ( type >= ARRAY_SIZE(types) ) {
snprintf_s_i(buf, sizeof(buf), "unknown (%u)", type);
return buf;
}
return types[type];
}
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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