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/*
* pconf_legacy.c: PCONF element (LCP_PCONF_ELEMENT) 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 <arpa/inet.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_FILES 32
#define MAX_PATH 256
#define MAX_PCRS 8 //PCRs 0-7
#define MAX_PCR_FILES 8;
//This will store pcr-related data
typedef struct pcr_data {
bool valid;
uint8_t num;
uint8_t locality;
uint8_t digest[SHA1_DIGEST_SIZE];
} pcr_data;
//Global vars:
uint8_t locality = DEFAULT_LOCALITY_SELECT;
char pcr_info_files[MAX_FILES][MAX_PATH];
uint8_t num_files = 0;
int prevOpt = 'i';
pcr_data pcrs[8];
static bool read_pcrinfo_file(const char *file)
{
/*
Each line in file has the following format:
locality:value
pcrNum:digest(no spaces)
Length max is 47
Each file is one PCR_INFO_SHORT and num of files
will be NumPcrInfoShort
*/
char delim[] = ":";
char *line = NULL;
char *token = NULL;
char *ptr2token = NULL;
size_t line_size_bytes = 80;
size_t chars_read;
unsigned long locality = 0x0;
line = malloc(line_size_bytes);
if (line == NULL) {
return false;
}
FILE *fp = NULL;
fp = fopen(file, "r");
if (fp == NULL) {
free(line);
return false;
}
while (getline(&line, &chars_read, fp) != -1 ) {
pcr_data this_pcr;
this_pcr.locality = 0xFF; //This is set by first line in file
this_pcr.num = 0xFF;
this_pcr.valid = false;
line_size_bytes = 80;
if (*line == '\n'|| *line == '#' || *line == '\r' || !*line) // if empty or # at the beginning skip
continue;
//First valid line should be locality
token = strtok_s(line, &line_size_bytes, delim, &ptr2token);
if (locality)
this_pcr.locality = locality;
if (strcmp(token, "locality") != 0 && !strisdigit_s(token, 1)) {
ERROR("Error: in pcrInfo file a line must be 'locality:value' or pcrNum:digest\n");
goto ERROR;
}
if (strcmp(token, "locality") == 0) {
//Only allowed once in a file
if (locality) {
ERROR("Error: locality was already specified.\n");
goto ERROR;
}
locality = strtoul(ptr2token, NULL, 16);
if (!locality) {
ERROR("Error: you must select at least one locality.\n");
goto ERROR;
}
if (locality > 0x1F) {
ERROR("Error: locality mask cannot be greater than 0x1F. Detected: 0x%x\n",
this_pcr.locality);
goto ERROR;
}
this_pcr.locality = locality;
continue;
}
//PcrNum is a digit 0 to 7
if (strisdigit_s(token, 1)) {
this_pcr.num = atoi(token);
if (this_pcr.num > 7) {
ERROR("Error: only pcrs 0-7 are supported.\n");
goto ERROR;
}
}
/*
Getline also reads up to and including newline. We need to remove it else
import_hash will fail.
*/
ptr2token[40] = '\0';
if (!import_hash(ptr2token, (tb_hash_t *) &this_pcr.digest, LCP_POLHALG_SHA1)) {
ERROR("Error: failed to import hash. Check digest format.\n");
goto ERROR;
}
if (this_pcr.locality != 0xFF && this_pcr.num != 0xFF) {
this_pcr.valid = true;
pcrs[this_pcr.num] = this_pcr;
}
else {
ERROR("Error: failed to read PCR data. Check input file.\n");
goto ERROR;
}
}
//SUCCESS:
fclose(fp);
free(line);
return true;
ERROR:
fclose(fp);
free(line);
return false;
}
static bool cmdline_handler(int c, const char *opt)
{
if (c) {
ERROR("Error: pconf element takes no CLI options\n");
return false;
}
if (opt) {
size_t opt_len = strnlen(opt, MAX_PATH);
strncpy_s(pcr_info_files[num_files], MAX_PATH, opt, opt_len);
num_files++;
return true;
}
else {
ERROR("Error: at least one file must be specified.\n");
return false;
}
if (num_files > MAX_FILES) {
ERROR("Error: too many files specified. Max is 32.\n");
return false;
}
}
static bool generate_composite_hash(pcr_data *pcrs, tb_hash_t *dest, uint8_t no_of_pcrs)
{
/*
This function: concatenates pcr values to one blob and hashes it using sha1
in: array of pcrs, allocated destination buffer, no of pcrs
out: true/false on success/failure. Dest gets the composite hash
*/
int count = 0;
bool result;
size_t buff_size;
unsigned char *buff;
if (pcrs == NULL || dest == NULL) {
ERROR("Error: pcrs or buffer for digest are not defined.\n");
return false;
}
if (no_of_pcrs < 1 || no_of_pcrs > 8) {
ERROR("Error: at least 1 and at most 8 pcrs must be selected.\n");
return false;
}
buff_size = no_of_pcrs * SHA1_DIGEST_SIZE;
buff = calloc(1, buff_size);
if (buff == NULL) {
ERROR("Error: failed to allocate buffer for composite digest.\n");
return false;
}
for (int i = 0; i < MAX_PCRS; i++) {
if (pcrs[i].valid) {
if (verbose) {
DISPLAY("PCR%d value: ", i);
print_hex("", (const void *) pcrs[i].digest, SHA1_DIGEST_SIZE);
}
memcpy_s(
buff + (count * SHA1_DIGEST_SIZE), //Dest
buff_size - (count * SHA1_DIGEST_SIZE), //Dest size
(const void *) pcrs[i].digest, //Src
SHA1_DIGEST_SIZE //Src size
);
count++;
}
if (count == no_of_pcrs)
break;
}
result = hash_buffer(buff, buff_size, dest, LCP_POLHALG_SHA1);
if (verbose) {
DISPLAY("Composite hash value: ");
print_hex("", (const void *) dest, SHA1_DIGEST_SIZE);
}
free(buff);
return result;
}
static lcp_policy_element_t *create(void)
{
lcp_policy_element_t *elt = NULL;
lcp_pconf_element_t *pconf = NULL;
tpm_pcr_info_short_t *pcr_info = NULL;
tb_hash_t *digest = NULL;
uint8_t no_of_pcrs = 0;
bool result;
uint8_t pcr_select;
//First set all pcrs to non-valid
size_t pconf_data_size = sizeof(lcp_pconf_element_t) +
(sizeof(tpm_pcr_info_short_t) * num_files);
size_t elt_size = sizeof(lcp_policy_element_t) + pconf_data_size;
elt = calloc(1, elt_size);
if (elt == NULL) {
ERROR("Error: failed to allocate memory for the element.\n");
return NULL;
}
elt->size = elt_size;
pconf = (lcp_pconf_element_t *) elt->data;
pcr_info = (tpm_pcr_info_short_t *) &pconf->pcr_infos[0];
pconf->num_pcr_infos = num_files;
for (uint8_t i = 0; i < pconf->num_pcr_infos; i++) {
//First clear all pcr_data values
pcr_select = 0x0;
no_of_pcrs = 0x0;
for (int i = 0; i < MAX_PCRS; i++) {
memset_s((void *) &pcrs[i], sizeof(pcr_data), 0x0);
}
result = read_pcrinfo_file(pcr_info_files[i]);
if (!result) {
ERROR("Error: failed to read PCR info file.\n");
free(elt);
return NULL;
}
for (int i = 0; i < MAX_PCRS; i++) {
if (pcrs[i].valid) {
pcr_select |= (1 << i); //Calculate pcr select mask
no_of_pcrs++;
}
}
if (!pcr_select) {
ERROR("Error: no pcrs were selected.\n");
return NULL;
}
digest = malloc(SHA1_DIGEST_SIZE);
if (digest == NULL) {
ERROR("Error: failed to allocate memory for digest buffer.\n");
return NULL;
}
result = generate_composite_hash(pcrs, digest, no_of_pcrs);
if (!result) {
ERROR("Error: failed to generate composite hash.\n");
free(digest);
free(elt);
return false;
}
pcr_info->locality_at_release = locality;
pcr_info->pcr_selection.size_of_select = 1;
pcr_info->pcr_selection.pcr_select = pcr_select;
memcpy_s((void *)&pcr_info->digest_at_release, SHA1_DIGEST_SIZE,
(const void *)&digest->sha1, SHA1_DIGEST_SIZE);
pcr_info++; //Move to next one
}
if (verbose) {
DISPLAY("PCONF element:\n");
print_hex(" ", (void *) elt, elt_size);
}
free(digest);
return elt;
}
static void display(const char *prefix, const lcp_policy_element_t *elt)
{
size_t new_prefix_len = 0;
lcp_pconf_element_t *pconf = (lcp_pconf_element_t *) elt->data;
tpm_pcr_info_short_t *pcr_info = (tpm_pcr_info_short_t *) pconf->pcr_infos;
if (elt == NULL) {
ERROR("Error: element is not defined.\n");
return;
}
if (*prefix == '\0')
new_prefix_len = 8;
else
new_prefix_len = strnlen_s(prefix, 20) + 8;
char new_prefix[new_prefix_len];
strcpy_s(new_prefix, sizeof(new_prefix), prefix);
strcat_s(new_prefix, sizeof(new_prefix), "\t");
DISPLAY("%sNumPcrInfos: 0x%x\n", prefix, pconf->num_pcr_infos);
for (int i = 0; i < pconf->num_pcr_infos; i++) {
DISPLAY("%sPCRInfos[%d]\n", prefix, i);
DISPLAY("%s%sTPM_PCR_SELECTION.sizeOfSelect: 0x%x\n", prefix,
prefix, pcr_info->pcr_selection.size_of_select);
DISPLAY("%s%sTPM_PCR_SELECTION.pcrSelect: 0x%x\n", prefix, prefix,
pcr_info->pcr_selection.pcr_select);
DISPLAY("%s%s:PCR-0:PCR-1:PCR-2:PCR-3:PCR-4:PCR-5:PCR-6:PCR-7:\n",
prefix, new_prefix);
DISPLAY("%s%s:", prefix, new_prefix);
for (int j = 0; j < 8; j++) {
DISPLAY(" %d :", pcr_info->pcr_selection.pcr_select&(1<<j) ? 1:0);
}
DISPLAY("\n%s%sTPM_LOCALITY_SELECTION.locality_at_release: 0x%x\n",
prefix, prefix, pcr_info->locality_at_release);
DISPLAY("%s%sTPM_COMPOSITE_HASH.digest_at_release:\n", prefix, prefix);
DISPLAY(prefix);
print_hex(new_prefix, (void *) pcr_info->digest_at_release, SHA1_DIGEST_SIZE);
pcr_info++;
}
}
static struct option opts[] = {
{0, 0, 0, 0}
};
static polelt_plugin_t plugin = {
"pconf",
opts,
" pconf\n"
" Generate LCP_ELEMENT_PCONF (legacy)\n"
" <FILE1> [FILES]\n"
" Up to 32 files with pcr info data.\n"
" First line should be: 'locality:<value>.'\n"
" Locality must be at least 1 and at most 0x1F.\n"
" Followed by up to 8 lines specifying PCR\n"
" numbers (0-7) and their contents e.g.:\n"
" 1:518bd167271fbb64589c61e43d8c0165861431d8\n",
LCP_POLELT_TYPE_PCONF,
&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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