mirror of
https://github.com/xen-project/xen.git
synced 2026-10-28 02:01:24 +01:00
Daniel De Graaf
5c3705c900
This is a complete rewrite of the disk format and key hierarchy for the TPM Manager. The new format supports multiple groups of vTPMs which define the permitted configurations where a given vTPM's keys are available, allowing upgrades of critical components while retaining the secrecy of cryptographic keys. New features of the TPM Manager are explained in the README and in the definitions of the management commands in vtpm_manager.h. New features for vTPMs: 1. The size of the state blob for a vTPM is expanded from 52 to 64 bytes in order to support future vTPMs using SHA-2/3 instead of SHA-1. 2. vTPMs can obtain a quote from the physical TPM with certain resettable PCRs set to include information about the vTPM. This can be used by a vTPM to provide evidence of its integrity, including the secrecy of its EK, and for deep quotes. Some additional changes made by this rewrite that may impact existing users: 1. The value of WELLKNOWN_OWNER_AUTH was incorrect for the physical TPM; the convention is to use all zero bits for well-known authentication values, not all one bits. 2. Randomly generating the owner auth value for the physical TPM is no longer supported, as it prevents later creation or certification of AIKs (which the old manager did not support). 3. The vTPM Manager needs to be provisioned with a PCR composite and an upgrade authority's public key before it will save data across boots. The current implementation still has some limitations: * 5 valid system PCR selections per group * The vTPM Manager's disk can use at most 2MB of space * The vTPM domain's build hash is always set to null/zero Most of the code relating to upgrade and rollback protection is currently stubbed out, but future versions can add: * Support for using the TPM's monotonic counter to prevent rollback of vTPM data by taking and restoring disk snapshots * Masking the master disk encryption key using a value stored in the TPM's NVRAM so that revocation of old data is possible without relying on all previously authorized software stacks to respect the monotonic counter's value Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Acked-by: Ian Campbell <ian.campbell@citrix.com>
88 lines
3.1 KiB
C
88 lines
3.1 KiB
C
/*
|
|
* Copyright (c) 2010-2012 United States Government, as represented by
|
|
* the Secretary of Defense. All rights reserved.
|
|
*
|
|
* based off of the original tools/vtpm_manager code base which is:
|
|
* Copyright (c) 2005, Intel Corp.
|
|
* 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 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.
|
|
*/
|
|
|
|
#ifndef __VTPM_LOG_H__
|
|
#define __VTPM_LOG_H__
|
|
|
|
#include <stdint.h> // for uint32_t
|
|
#include <stddef.h> // for pointer NULL
|
|
#include <stdio.h>
|
|
#include "tcg.h"
|
|
|
|
// =========================== LOGGING ==============================
|
|
|
|
// the logging module numbers
|
|
#define VTPM_LOG_TPM 1
|
|
#define VTPM_LOG_TPM_DEEP 2
|
|
#define VTPM_LOG_VTPM 3
|
|
#define VTPM_LOG_VTPM_DEEP 4
|
|
#define VTPM_LOG_TXDATA 5
|
|
|
|
extern char *module_names[];
|
|
|
|
// Default to standard logging
|
|
#ifndef LOGGING_MODULES
|
|
#define LOGGING_MODULES (BITMASK(VTPM_LOG_VTPM)|BITMASK(VTPM_LOG_TPM))
|
|
#endif
|
|
|
|
// bit-access macros
|
|
#define BITMASK(idx) ( 1U << (idx) )
|
|
#define GETBIT(num,idx) ( ((num) & BITMASK(idx)) >> idx )
|
|
#define SETBIT(num,idx) (num) |= BITMASK(idx)
|
|
#define CLEARBIT(num,idx) (num) &= ( ~ BITMASK(idx) )
|
|
|
|
void printk(const char *fmt, ...);
|
|
|
|
#define vtpmloginfo(module, fmt, args...) \
|
|
if (GETBIT (LOGGING_MODULES, module) == 1) { \
|
|
printk("INFO[%s]: " fmt, module_names[module], ##args); \
|
|
}
|
|
|
|
#define vtpmloginfomore(module, fmt, args...) \
|
|
if (GETBIT (LOGGING_MODULES, module) == 1) { \
|
|
printk(fmt,##args); \
|
|
}
|
|
|
|
#define vtpmlogerror(module, fmt, args...) \
|
|
printk("ERROR[%s]: " fmt, module_names[module], ##args);
|
|
|
|
//typedef UINT32 tpm_size_t;
|
|
|
|
// helper function for the error codes:
|
|
const char* tpm_get_error_name (TPM_RESULT code);
|
|
|
|
#endif // _VTPM_LOG_H_
|