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tsscommands.c
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tsscommands.c
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/*******************************************************************************
* Code originally contributed to the webinos project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2011 University of Oxford
*******************************************************************************/
/*
* tsscommands.c
*
* Created on: 25 Oct 2011
* Author: John Lyle
*
*
*/
#include "tsscommands.h"
#include <stdio.h>
#define NULL_HOBJECT 0
#define NULL_HKEY NULL_HOBJECT
#define NULL_HPCRS NULL_HOBJECT
char* getErrorCode(TSS_RESULT result) {
if (result != 0) {
char* errStr = (char*) Trspi_Error_String(result);
return errStr;
} else {
return "";
}
}
TSS_RESULT closeContext(TSS_HCONTEXT context) {
TSS_RESULT result = Tspi_Context_FreeMemory(context, NULL);
if (result != 0)
return result;
return Tspi_Context_Close(context);
}
TSS_RESULT connectContext(TSS_HCONTEXT context) {
TSS_RESULT result = Tspi_Context_Connect(context, NULL);
return result;
}
TSS_RESULT loadKeyByUUID(TSS_HCONTEXT context, TSS_UUID id, TSS_HKEY * key) {
TSS_FLAG storeType = TSS_PS_TYPE_USER;
return Tspi_Context_LoadKeyByUUID(context, storeType, id, key);
}
TSS_RESULT getSrk(TSS_HCONTEXT context, UINT32 secretMode, char* secret,
UINT32 secretLen, TSS_HKEY* key) {
TSS_HPOLICY srkPolicy;
TSS_UUID SRK_UUID = TSS_UUID_SRK;
TSS_RESULT result = Tspi_Context_LoadKeyByUUID(context, TSS_PS_TYPE_SYSTEM,
SRK_UUID, key);
if (result != 0)
return result;
result = Tspi_GetPolicyObject(*key, TSS_POLICY_USAGE, &srkPolicy);
if (result != 0)
return result;
return Tspi_Policy_SetSecret(srkPolicy, secretMode, secretLen, secret);
}
TSS_RESULT pcrExtend(UINT32 pcrNumber, UINT32 pcrDataLength, BYTE* data)
{
TSS_HCONTEXT context;
TSS_RESULT result;
TSS_HTPM tpm;
UINT32 pcrResLength;
BYTE* pcrRes;
result = Tspi_Context_Create(&context);
if (result != 0)
return -1;
result = connectContext(context);
if (result != 0)
return -1;
result = Tspi_Context_GetTpmObject(context, &tpm);
if (result != 0)
return -1;
result = Tspi_TPM_PcrExtend(tpm, pcrNumber, pcrDataLength, data, NULL, &pcrResLength, &pcrRes);
if (result != 0)
return -1;
return result;
}
TSS_RESULT getKeyFromFile(TSS_HCONTEXT context, TSS_HKEY srk, char* filename,
TSS_HKEY* key) {
FILE *file;
BYTE *buf;
UINT32 bufLen;
TSS_RESULT result;
/* Open the key file */
if ((file = fopen(filename, "rb")) == NULL) {
fprintf(stderr, "Unable to open the file %s\n", filename);
return result;
}
/* How long is it? */
fseek(file, 0, SEEK_END);
bufLen = ftell(file);
/* Read the file */
fseek(file, 0, SEEK_SET);
buf = malloc(bufLen);
if (fread(buf, 1, bufLen, file) != bufLen) {
fprintf(stderr, "Unable to read file %s\n", filename);
return result;
}
fclose(file);
/* Load by blob */
result = Tspi_Context_LoadKeyByBlob(context, srk, bufLen, buf, key);
free(buf);
return result;
/* Assign a policy, if necessary
* ... actually, I'm going to assume no policy / secret is required for an AIK.
*/
/*
if (pass) {
result = Tspi_Context_CreateObject(hContext, TSS_OBJECT_TYPE_POLICY,
TSS_POLICY_USAGE, &hAIKPolicy); CKERR;
result = Tspi_Policy_AssignToObject(hAIKPolicy, hAIK);
result = Tspi_Policy_SetSecret (hAIKPolicy, TSS_SECRET_MODE_PLAIN,
strlen(pass), pass); CKERR;
}
*/
}
TSS_FLAG getSigningKeyFlags()
{
TSS_FLAG keyFlags = TSS_KEYUSAGE_SIGN | TSS_KEY_SIZE_2048 | TSS_KEY_VOLATILE | TSS_KEY_NOT_MIGRATABLE;
return keyFlags;
}
TSS_FLAG getStorageKeyFlags()
{
/* With thanks to the TPM Tools examples!*/
TSS_FLAG keyFlags = TSS_KEY_TYPE_STORAGE | TSS_KEY_SIZE_2048 | TSS_KEY_VOLATILE | TSS_KEY_AUTHORIZATION |
TSS_KEY_NOT_MIGRATABLE;
return keyFlags;
}
TSS_RESULT createTpmKey2(TSS_HCONTEXT context, TSS_FLAG keyFlags, TSS_HKEY srk,
TSS_HKEY * key) {
TSS_RESULT result;
TSS_HPOLICY keyPolicy;
result = Tspi_Context_CreateObject(context, TSS_OBJECT_TYPE_RSAKEY, keyFlags, key);
if (result != 0)
return result;
result = Tspi_Context_CreateObject(context, TSS_OBJECT_TYPE_POLICY, TSS_POLICY_USAGE,
&keyPolicy);
if (result != 0)
return result;
result = Tspi_Policy_SetSecret(keyPolicy, TSS_SECRET_MODE_NONE, 0, NULL);
if (result != 0)
return result;
result = Tspi_Policy_AssignToObject(keyPolicy, *key);
if (result != 0)
return result;
result = Tspi_Key_CreateKey(*key, srk, NULL_HPCRS);
return result;
}
TSS_RESULT createKey(TSS_HKEY * key)
{
}
/*
* Read a pcr with the given number, and store it into the given BYTE array.
* Returns either -1 on error, or the length of the pcr byte array.
*/
UINT32 pcrRead(int pcrNumber, BYTE** pcrRes) {
TSS_HCONTEXT context;
TSS_RESULT result;
TSS_HTPM tpm;
UINT32 pcrResLength;
result = Tspi_Context_Create(&context);
if (result != 0)
return -1;
result = connectContext(context);
if (result != 0)
return -1;
result = Tspi_Context_GetTpmObject(context, &tpm);
if (result != 0)
return -1;
result = Tspi_TPM_PcrRead(tpm, pcrNumber, &pcrResLength, pcrRes);
if (result != 0) {
printf("Could not read PCR %d\n", pcrNumber);
return -1;
}
return pcrResLength;
}
/*
* Creates a TPM quote and stores the output into "valid" and "quoteInfo"
* Returns either 0 (success) or another value on error.
*
* Needs an SRK Password char* array, a filename, a list of PCR indexs,
* the length of the PCR index, and a 20-byte nonce.
*
*/
TSS_RESULT quote(char* srkPwd, char* aikfile, long pcrs[], int npcrs,
BYTE nonce[], TSS_VALIDATION* valid, TPM_QUOTE_INFO* quoteInfo) {
TSS_HCONTEXT context;
TSS_RESULT result;
TSS_HTPM tpm;
TSS_HKEY srk;
TSS_HKEY aik;
UINT32 pcrResLength;
BYTE* pcrRes;
result = Tspi_Context_Create(&context);
if (result != 0)
return result;
result = connectContext(context);
if (result != 0)
return result;
result = getTpmTspi_Context_GetTpmObject(context, &tpm);
if (result != 0)
return result;
result = getSrk(context, TSS_SECRET_MODE_PLAIN, srkPwd, strlen(srkPwd),
&srk);
if (result != 0)
return result;
result = getKeyFromFile(context, srk, aikfile, &aik);
if (result != 0)
return result;
result = createQuote(pcrs, 1, nonce, context, tpm, srk, aik, valid,
quoteInfo);
if (result != 0)
return result;
result = closeContext(context);
if (result != 0)
return result;
return result;
}
/* The following method has this copyright notice */
/*
* Copyright (c) 2009 Hal Finney
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/* nonce is 20 in length */
TSS_RESULT createQuote(long pcrs[], int npcrs, BYTE nonce[],
TSS_HCONTEXT context, TSS_HTPM tpm, TSS_HKEY srk, TSS_HKEY aik,
TSS_VALIDATION* valid, TPM_QUOTE_INFO* quoteInfo) {
UINT32 tpmProp;
UINT32 npcrMax;
UINT32 npcrBytes;
TSS_HPCRS hPCRs;
BYTE *tmpbuf;
UINT32 tmpbufLen;
BYTE *buf;
int i;
UINT32 bufLen;
BYTE *bp;
/* Create PCR list to be quoted */
tpmProp = TSS_TPMCAP_PROP_PCR;
TSS_RESULT result = Tspi_TPM_GetCapability(tpm, TSS_TPMCAP_PROPERTY,
sizeof(tpmProp), (BYTE *) &tpmProp, &tmpbufLen, &tmpbuf);
if (result != 0)
return result;
npcrMax = *(UINT32 *) tmpbuf;
result = Tspi_Context_FreeMemory(context, tmpbuf);
if (result != 0)
return result;
npcrBytes = (npcrMax + 7) / 8;
result = Tspi_Context_CreateObject(context, TSS_OBJECT_TYPE_PCRS,
TSS_PCRS_STRUCT_INFO, &hPCRs);
if (result != 0)
return result;
/* Also PCR buffer */
buf = malloc(2 + npcrBytes + 4 + 20 * npcrMax);
*(UINT16 *) buf = htons(npcrBytes);
for (i = 0; i < npcrBytes; i++)
buf[2 + i] = 0;
for (i = 0; i < npcrs; i++) {
result = Tspi_PcrComposite_SelectPcrIndex(hPCRs, pcrs[i]);
if (result != 0)
return result;
buf[2 + (pcrs[i] / 8)] |= 1 << (pcrs[i] % 8);
}
/* Create TSS_VALIDATION struct for Quote */
(*valid).ulExternalDataLength = 20;
(*valid).rgbExternalData = nonce;
/* Perform Quote */
result = Tspi_TPM_Quote(tpm, aik, hPCRs, valid);
if (result != 0)
return result;
quoteInfo = (TPM_QUOTE_INFO *) (*valid).rgbData;
/* Fill in rest of PCR buffer */
bp = buf + 2 + npcrBytes;
*(UINT32 *) bp = htonl(20 * npcrs);
bp += sizeof(UINT32);
for (i = 0; i < npcrMax; i++) {
if (buf[2 + (i / 8)] & (1 << (i % 8))) {
result = Tspi_PcrComposite_GetPcrValue(hPCRs, i, &tmpbufLen,
&tmpbuf);
if (result != 0)
return result;
memcpy(bp, tmpbuf, tmpbufLen);
bp += tmpbufLen;
result = Tspi_Context_FreeMemory(context, tmpbuf);
if (result != 0)
return result;
}
}
bufLen = bp - buf;
Tspi_Context_FreeMemory(context, tmpbuf);
return result;
}