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/********************************************************************************/
/* */
/* Extend an EVENT measurement file into PCRs */
/* Written by Ken Goldman */
/* IBM Thomas J. Watson Research Center */
/* $Id: eventextend.c 978 2017-04-04 15:37:15Z kgoldman $ */
/* */
/* (c) Copyright IBM Corporation 2016. */
/* */
/* 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 names of the IBM 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 */
/* HOLDER 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. */
/********************************************************************************/
/* eventextend is test/demo code. It parses a TPM2 event log file and extends the measurements
into TPM PCRs. This simulates the actions that would be performed by BIOS / firmware in a
hardware platform. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <tss2/tss.h>
#include <tss2/tssresponsecode.h>
#include "eventlib.h"
/* local prototypes */
static void printUsage(void);
int verbose = FALSE;
int main(int argc, char * argv[])
{
TPM_RC rc = 0;
int i = 0;
TSS_CONTEXT *tssContext = NULL;
const char *infilename = NULL;
FILE *infile = NULL;
TCG_PCR_EVENT2 event2; /* TPM 2.0 event log entry */
TCG_PCR_EVENT event; /* TPM 1.2 event log entry */
TCG_EfiSpecIDEvent specIdEvent;
unsigned int lineNum;
int endOfFile = FALSE;
PCR_Extend_In in;
setvbuf(stdout, 0, _IONBF, 0); /* output may be going through pipe to log file */
TSS_SetProperty(NULL, TPM_TRACE_LEVEL, "1");
for (i=1 ; i<argc ; i++) {
if (strcmp(argv[i],"-if") == 0) {
i++;
if (i < argc) {
infilename = argv[i];
}
else {
printf("-if option needs a value\n");
printUsage();
exit(2);
}
}
else if (!strcmp(argv[i], "-h")) {
printUsage();
}
else if (!strcmp(argv[i], "-v")) {
verbose = TRUE;
TSS_SetProperty(NULL, TPM_TRACE_LEVEL, "2");
}
else {
printf("\n%s is not a valid option\n", argv[i]);
printUsage();
}
}
if (infilename == NULL) {
printf("Missing -if argument\n");
printUsage();
}
/*
** read the event log file
*/
infile = fopen(infilename,"rb");
if (infile == NULL) {
printf("Unable to open input file '%s'\n", infilename);
exit(-4);
}
/* the first event is a TPM 1.2 format event */
/* read an event line */
if (rc == 0) {
rc = TSS_EVENT_Line_Read(&event, &endOfFile, infile);
}
/* debug tracing */
if (verbose && !endOfFile && (rc == 0)) {
printf("\neventextend: line 0\n");
TSS_EVENT_Line_Trace(&event);
}
/* parse the event */
if (verbose && !endOfFile && (rc == 0)) {
rc = TSS_SpecIdEvent_Unmarshal(&specIdEvent,
event.eventDataSize, event.event);
}
/* trace the event */
if (verbose && !endOfFile && (rc == 0)) {
TSS_SpecIdEvent_Trace(&specIdEvent);
}
/* Start a TSS context */
if (rc == 0) {
rc = TSS_Create(&tssContext);
}
/* scan each measurement 'line' in the binary */
for (lineNum = 1 ; !endOfFile && (rc == 0) ; lineNum++) {
/* read a TPM 2.0 hash agile event line */
if (rc == 0) {
rc = TSS_EVENT2_Line_Read(&event2, &endOfFile, infile);
}
/* debug tracing */
if (verbose && !endOfFile && (rc == 0)) {
printf("\neventextend: line %u\n", lineNum);
TSS_EVENT2_Line_Trace(&event2);
}
/* don't extend no action events */
if (!endOfFile && (rc == 0)) {
if (event2.eventType == EV_NO_ACTION) {
continue;
}
}
if (!endOfFile && (rc == 0)) {
in.pcrHandle = event2.pcrIndex;
in.digests = event2.digests;
rc = TSS_Execute(tssContext,
NULL,
(COMMAND_PARAMETERS *)&in,
NULL,
TPM_CC_PCR_Extend,
TPM_RS_PW, NULL, 0,
TPM_RH_NULL, NULL, 0);
}
/* for debug, read back and trace the PCR value after the extend */
if (verbose) {
PCR_Read_In pcrReadIn;
PCR_Read_Out pcrReadOut;
if (!endOfFile && (rc == 0)) {
pcrReadIn.pcrSelectionIn.count = 1;
pcrReadIn.pcrSelectionIn.pcrSelections[0].hash =
event2.digests.digests[0].hashAlg;
pcrReadIn.pcrSelectionIn.pcrSelections[0].sizeofSelect = 3;
pcrReadIn.pcrSelectionIn.pcrSelections[0].pcrSelect[0] = 0;
pcrReadIn.pcrSelectionIn.pcrSelections[0].pcrSelect[1] = 0;
pcrReadIn.pcrSelectionIn.pcrSelections[0].pcrSelect[2] = 0;
pcrReadIn.pcrSelectionIn.pcrSelections[0].pcrSelect[event2.pcrIndex / 8] =
1 << (event2.pcrIndex % 8);
}
if (!endOfFile && (rc == 0)) {
rc = TSS_Execute(tssContext,
(RESPONSE_PARAMETERS *)&pcrReadOut,
(COMMAND_PARAMETERS *)&pcrReadIn,
NULL,
TPM_CC_PCR_Read,
TPM_RH_NULL, NULL, 0);
}
if (!endOfFile && (rc == 0)) {
TSS_PrintAll("PCR digest",
pcrReadOut.pcrValues.digests[0].t.buffer,
pcrReadOut.pcrValues.digests[0].t.size);
}
}
}
{
TPM_RC rc1 = TSS_Delete(tssContext);
if (rc == 0) {
rc = rc1;
}
}
if (rc == 0) {
if (verbose) printf("eventextend: success\n");
}
else {
const char *msg;
const char *submsg;
const char *num;
printf("eventextend: failed, rc %08x\n", rc);
TSS_ResponseCode_toString(&msg, &submsg, &num, rc);
printf("%s%s%s\n", msg, submsg, num);
rc = EXIT_FAILURE;
}
if (infile != NULL) {
fclose(infile);
}
return rc;
}
static void printUsage(void)
{
printf("Usage: eventextend -if <measurement file> [-v]\n");
printf("\n");
printf("Extends a measurement file (binary) into TPM PCRs\n");
printf("\n");
printf(" Where the arguments are...\n");
printf(" -if <input file> is the file containing the data to be extended\n");
printf("\n");
exit(-1);
}
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