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552 lines
18 KiB
552 lines
18 KiB
/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* This program generates partially filled TPM datagrams and other compile-time
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* constants (e.g. structure sizes and offsets). Compile this file---and ONLY
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* this file---with -fpack-struct. We take advantage of the fact that the
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* (packed) TPM structures layout (mostly) match the TPM request and response
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* datagram layout. When they don't completely match, some fixing is necessary
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* (see PCR_SELECTION_FIX below).
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*/
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#include <assert.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <tss/tcs.h>
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#include "sysincludes.h"
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#include "tlcl_internal.h"
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#include "tpmextras.h"
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/* See struct Command below. This structure represent a field in a TPM
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* command. [name] is the field name. [visible] is 1 if the field is
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* modified by the run-time. Non-visible fields are initialized at build time
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* and remain constant. [size] is the field size in bytes. [value] is the
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* fixed value of non-visible fields.
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*/
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typedef struct Field {
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const char* name;
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int visible;
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int offset;
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int size;
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uint32_t value; /* large enough for all initializers */
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struct Field* next;
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} Field;
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/* This structure is used to build (at build time) and manipulate (at firmware
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* or emulation run time) buffers containing TPM datagrams. [name] is the name
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* of a TPM command. [size] is the size of the command buffer in bytes, when
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* known. [max_size] is the maximum size allowed for variable-length commands
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* (such as Read and Write). [fields] is a link-list of command fields.
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*/
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typedef struct Command {
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const char* name;
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int size;
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int max_size;
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Field* fields;
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struct Command* next;
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} Command;
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/* Adds a field to a command, and makes its offset visible. The fields must be
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* added at increasing offsets.
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*/
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static void AddVisibleField(Command* cmd, const char* name, int offset) {
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Field* fld = (Field*) calloc(1, sizeof(Field));
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if (cmd->fields != NULL) {
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assert(offset > fn->offset);
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}
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fld->next = cmd->fields;
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cmd->fields = fld;
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fld->name = name;
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fld->visible = 1;
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fld->offset = offset;
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}
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/* Adds a constant field with its value. The fields must be added at
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* increasing offsets.
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*/
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static void AddInitializedField(Command* cmd, int offset,
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int size, uint32_t value) {
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Field* fld = (Field*) calloc(1, sizeof(Field));
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fld->next = cmd->fields;
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cmd->fields = fld;
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fld->name = NULL;
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fld->visible = 0;
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fld->size = size;
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fld->offset = offset;
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fld->value = value;
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}
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/* Create a structure representing a TPM command datagram.
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*/
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Command* newCommand(TPM_COMMAND_CODE code, int size) {
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Command* cmd = (Command*) calloc(1, sizeof(Command));
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cmd->size = size;
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AddInitializedField(cmd, 0, sizeof(TPM_TAG), TPM_TAG_RQU_COMMAND);
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AddInitializedField(cmd, sizeof(TPM_TAG), sizeof(uint32_t), size);
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AddInitializedField(cmd, sizeof(TPM_TAG) + sizeof(uint32_t),
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sizeof(TPM_COMMAND_CODE), code);
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return cmd;
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}
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/* The TPM_PCR_SELECTION structure in /usr/include/tss/tpm.h contains a pointer
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* instead of an array[3] of bytes, so we need to adjust sizes and offsets
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* accordingly.
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*/
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#define PCR_SELECTION_FIX (3 - sizeof(char *))
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/* BuildXXX builds TPM command XXX.
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*/
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Command* BuildDefineSpaceCommand(void) {
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int nv_data_public = kTpmRequestHeaderLength;
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int nv_index = nv_data_public + offsetof(TPM_NV_DATA_PUBLIC, nvIndex);
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int nv_pcr_info_read = nv_data_public +
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offsetof(TPM_NV_DATA_PUBLIC, pcrInfoRead);
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/*
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* Here we need to carefully add PCR_SELECTION_FIX (or twice that much) in
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* all the places where the offset calculation would be wrong without it.
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* The mismatch occurs in the TPM_PCR_SELECTION structure, and it must be
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* accounted for in all the structures that include it, directly or
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* indirectly.
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*/
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int read_locality = nv_pcr_info_read +
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offsetof(TPM_PCR_INFO_SHORT, localityAtRelease) + PCR_SELECTION_FIX;
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int nv_pcr_info_write = nv_data_public +
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offsetof(TPM_NV_DATA_PUBLIC, pcrInfoWrite) + PCR_SELECTION_FIX;
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int write_locality = nv_pcr_info_write +
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offsetof(TPM_PCR_INFO_SHORT, localityAtRelease) + PCR_SELECTION_FIX;
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int nv_permission = nv_data_public +
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offsetof(TPM_NV_DATA_PUBLIC, permission) + 2 * PCR_SELECTION_FIX;
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int nv_permission_tag =
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nv_permission + offsetof(TPM_NV_ATTRIBUTES, tag);
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int nv_permission_attributes =
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nv_permission + offsetof(TPM_NV_ATTRIBUTES, attributes);
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int nv_datasize = nv_data_public +
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offsetof(TPM_NV_DATA_PUBLIC, dataSize) + 2 * PCR_SELECTION_FIX;
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int size = kTpmRequestHeaderLength + sizeof(TPM_NV_DATA_PUBLIC) +
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2 * PCR_SELECTION_FIX + kEncAuthLength;
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Command* cmd = newCommand(TPM_ORD_NV_DefineSpace, size);
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cmd->name = "tpm_nv_definespace_cmd";
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AddVisibleField(cmd, "index", nv_index);
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AddVisibleField(cmd, "perm", nv_permission_attributes);
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AddVisibleField(cmd, "size", nv_datasize);
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AddInitializedField(cmd, nv_data_public, sizeof(uint16_t),
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TPM_TAG_NV_DATA_PUBLIC);
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AddInitializedField(cmd, nv_pcr_info_read, sizeof(uint16_t), 3);
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AddInitializedField(cmd, read_locality, sizeof(TPM_LOCALITY_SELECTION),
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TPM_ALL_LOCALITIES);
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AddInitializedField(cmd, nv_pcr_info_write, sizeof(uint16_t), 3);
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AddInitializedField(cmd, write_locality, sizeof(TPM_LOCALITY_SELECTION),
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TPM_ALL_LOCALITIES);
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AddInitializedField(cmd, nv_permission_tag, sizeof(TPM_STRUCTURE_TAG),
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TPM_TAG_NV_ATTRIBUTES);
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return cmd;
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}
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/* BuildXXX builds TPM command XXX.
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*/
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Command* BuildWriteCommand(void) {
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Command* cmd = newCommand(TPM_ORD_NV_WriteValue, 0);
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cmd->name = "tpm_nv_write_cmd";
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cmd->max_size = TPM_LARGE_ENOUGH_COMMAND_SIZE;
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AddVisibleField(cmd, "index", kTpmRequestHeaderLength);
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AddVisibleField(cmd, "length", kTpmRequestHeaderLength + 8);
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AddVisibleField(cmd, "data", kTpmRequestHeaderLength + 12);
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return cmd;
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}
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Command* BuildReadCommand(void) {
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int size = kTpmRequestHeaderLength + kTpmReadInfoLength;
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Command* cmd = newCommand(TPM_ORD_NV_ReadValue, size);
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cmd->name = "tpm_nv_read_cmd";
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AddVisibleField(cmd, "index", kTpmRequestHeaderLength);
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AddVisibleField(cmd, "length", kTpmRequestHeaderLength + 8);
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return cmd;
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}
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Command* BuildPCRReadCommand(void) {
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int size = kTpmRequestHeaderLength + sizeof(uint32_t);
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Command* cmd = newCommand(TPM_ORD_PcrRead, size);
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cmd->name = "tpm_pcr_read_cmd";
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AddVisibleField(cmd, "pcrNum", kTpmRequestHeaderLength);
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return cmd;
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}
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Command* BuildPPAssertCommand(void) {
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int size = kTpmRequestHeaderLength + sizeof(TPM_PHYSICAL_PRESENCE);
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Command* cmd = newCommand(TSC_ORD_PhysicalPresence, size);
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cmd->name = "tpm_ppassert_cmd";
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AddInitializedField(cmd, kTpmRequestHeaderLength,
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sizeof(TPM_PHYSICAL_PRESENCE),
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TPM_PHYSICAL_PRESENCE_PRESENT);
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return cmd;
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}
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Command* BuildPPEnableCommand(void) {
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int size = kTpmRequestHeaderLength + sizeof(TPM_PHYSICAL_PRESENCE);
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Command* cmd = newCommand(TSC_ORD_PhysicalPresence, size);
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cmd->name = "tpm_ppenable_cmd";
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AddInitializedField(cmd, kTpmRequestHeaderLength,
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sizeof(TPM_PHYSICAL_PRESENCE),
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TPM_PHYSICAL_PRESENCE_CMD_ENABLE);
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return cmd;
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}
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Command* BuildFinalizePPCommand(void) {
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int size = kTpmRequestHeaderLength + sizeof(TPM_PHYSICAL_PRESENCE);
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Command* cmd = newCommand(TSC_ORD_PhysicalPresence, size);
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cmd->name = "tpm_finalizepp_cmd";
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AddInitializedField(cmd, kTpmRequestHeaderLength,
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sizeof(TPM_PHYSICAL_PRESENCE),
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TPM_PHYSICAL_PRESENCE_CMD_ENABLE |
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TPM_PHYSICAL_PRESENCE_HW_DISABLE |
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TPM_PHYSICAL_PRESENCE_LIFETIME_LOCK);
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return cmd;
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}
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Command* BuildPPLockCommand(void) {
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int size = kTpmRequestHeaderLength + sizeof(TPM_PHYSICAL_PRESENCE);
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Command* cmd = newCommand(TSC_ORD_PhysicalPresence, size);
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cmd->name = "tpm_pplock_cmd";
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AddInitializedField(cmd, kTpmRequestHeaderLength,
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sizeof(TPM_PHYSICAL_PRESENCE),
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TPM_PHYSICAL_PRESENCE_LOCK);
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return cmd;
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}
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Command* BuildStartupCommand(void) {
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int size = kTpmRequestHeaderLength + sizeof(TPM_STARTUP_TYPE);
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Command* cmd = newCommand(TPM_ORD_Startup, size);
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cmd->name = "tpm_startup_cmd";
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AddInitializedField(cmd, kTpmRequestHeaderLength,
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sizeof(TPM_STARTUP_TYPE),
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TPM_ST_CLEAR);
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return cmd;
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}
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Command* BuildSaveStateCommand(void) {
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int size = kTpmRequestHeaderLength;
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Command* cmd = newCommand(TPM_ORD_SaveState, size);
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cmd->name = "tpm_savestate_cmd";
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return cmd;
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}
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Command* BuildResumeCommand(void) {
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int size = kTpmRequestHeaderLength + sizeof(TPM_STARTUP_TYPE);
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Command* cmd = newCommand(TPM_ORD_Startup, size);
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cmd->name = "tpm_resume_cmd";
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AddInitializedField(cmd, kTpmRequestHeaderLength,
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sizeof(TPM_STARTUP_TYPE),
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TPM_ST_STATE);
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return cmd;
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}
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Command* BuildSelftestfullCommand(void) {
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int size = kTpmRequestHeaderLength;
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Command* cmd = newCommand(TPM_ORD_SelfTestFull, size);
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cmd->name = "tpm_selftestfull_cmd";
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return cmd;
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}
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Command* BuildContinueSelfTestCommand(void) {
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int size = kTpmRequestHeaderLength;
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Command* cmd = newCommand(TPM_ORD_ContinueSelfTest, size);
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cmd->name = "tpm_continueselftest_cmd";
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return cmd;
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}
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Command* BuildReadPubekCommand(void) {
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int size = kTpmRequestHeaderLength + sizeof(TPM_NONCE);
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Command* cmd = newCommand(TPM_ORD_ReadPubek, size);
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cmd->name = "tpm_readpubek_cmd";
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return cmd;
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}
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Command* BuildForceClearCommand(void) {
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int size = kTpmRequestHeaderLength;
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Command* cmd = newCommand(TPM_ORD_ForceClear, size);
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cmd->name = "tpm_forceclear_cmd";
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return cmd;
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}
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Command* BuildPhysicalEnableCommand(void) {
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int size = kTpmRequestHeaderLength;
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Command* cmd = newCommand(TPM_ORD_PhysicalEnable, size);
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cmd->name = "tpm_physicalenable_cmd";
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return cmd;
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}
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Command* BuildPhysicalDisableCommand(void) {
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int size = kTpmRequestHeaderLength;
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Command* cmd = newCommand(TPM_ORD_PhysicalDisable, size);
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cmd->name = "tpm_physicaldisable_cmd";
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return cmd;
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}
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Command* BuildPhysicalSetDeactivatedCommand(void) {
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int size = kTpmRequestHeaderLength + sizeof(uint8_t);
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Command* cmd = newCommand(TPM_ORD_PhysicalSetDeactivated, size);
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cmd->name = "tpm_physicalsetdeactivated_cmd";
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AddVisibleField(cmd, "deactivated", kTpmRequestHeaderLength);
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return cmd;
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}
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Command* BuildExtendCommand(void) {
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int size = kTpmRequestHeaderLength + sizeof(uint32_t) + kPcrDigestLength;
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Command* cmd = newCommand(TPM_ORD_Extend, size);
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cmd->name = "tpm_extend_cmd";
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AddVisibleField(cmd, "pcrNum", kTpmRequestHeaderLength);
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AddVisibleField(cmd, "inDigest", kTpmRequestHeaderLength + sizeof(uint32_t));
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return cmd;
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}
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Command* BuildGetFlagsCommand(void) {
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int size = (kTpmRequestHeaderLength +
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sizeof(TPM_CAPABILITY_AREA) + /* capArea */
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sizeof(uint32_t) + /* subCapSize */
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sizeof(uint32_t)); /* subCap */
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Command* cmd = newCommand(TPM_ORD_GetCapability, size);
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cmd->name = "tpm_getflags_cmd";
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AddInitializedField(cmd, kTpmRequestHeaderLength,
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sizeof(TPM_CAPABILITY_AREA), TPM_CAP_FLAG);
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AddInitializedField(cmd, kTpmRequestHeaderLength +
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sizeof(TPM_CAPABILITY_AREA),
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sizeof(uint32_t), sizeof(uint32_t));
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AddInitializedField(cmd, kTpmRequestHeaderLength +
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sizeof(TPM_CAPABILITY_AREA) + sizeof(uint32_t),
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sizeof(uint32_t), TPM_CAP_FLAG_PERMANENT);
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return cmd;
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}
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Command* BuildGetSTClearFlagsCommand(void) {
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int size = (kTpmRequestHeaderLength +
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sizeof(TPM_CAPABILITY_AREA) + /* capArea */
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sizeof(uint32_t) + /* subCapSize */
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sizeof(uint32_t)); /* subCap */
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Command* cmd = newCommand(TPM_ORD_GetCapability, size);
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cmd->name = "tpm_getstclearflags_cmd";
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AddInitializedField(cmd, kTpmRequestHeaderLength,
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sizeof(TPM_CAPABILITY_AREA), TPM_CAP_FLAG);
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AddInitializedField(cmd, kTpmRequestHeaderLength +
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sizeof(TPM_CAPABILITY_AREA),
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sizeof(uint32_t), sizeof(uint32_t));
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AddInitializedField(cmd, kTpmRequestHeaderLength +
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sizeof(TPM_CAPABILITY_AREA) + sizeof(uint32_t),
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sizeof(uint32_t), TPM_CAP_FLAG_VOLATILE);
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return cmd;
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}
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Command* BuildGetPermissionsCommand(void) {
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int size = (kTpmRequestHeaderLength +
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sizeof(TPM_CAPABILITY_AREA) + /* capArea */
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sizeof(uint32_t) + /* subCapSize */
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sizeof(uint32_t)); /* subCap */
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Command* cmd = newCommand(TPM_ORD_GetCapability, size);
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cmd->name = "tpm_getpermissions_cmd";
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AddInitializedField(cmd, kTpmRequestHeaderLength,
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sizeof(TPM_CAPABILITY_AREA), TPM_CAP_NV_INDEX);
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AddInitializedField(cmd, kTpmRequestHeaderLength +
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sizeof(TPM_CAPABILITY_AREA),
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sizeof(uint32_t), sizeof(uint32_t));
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AddVisibleField(cmd, "index", kTpmRequestHeaderLength +
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sizeof(TPM_CAPABILITY_AREA) + sizeof(uint32_t));
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return cmd;
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}
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Command* BuildGetOwnershipCommand(void) {
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int size = (kTpmRequestHeaderLength +
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sizeof(TPM_CAPABILITY_AREA) + /* capArea */
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sizeof(uint32_t) + /* subCapSize */
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sizeof(uint32_t)); /* subCap */
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Command* cmd = newCommand(TPM_ORD_GetCapability, size);
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cmd->name = "tpm_getownership_cmd";
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AddInitializedField(cmd, kTpmRequestHeaderLength,
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sizeof(TPM_CAPABILITY_AREA), TPM_CAP_PROPERTY);
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AddInitializedField(cmd, kTpmRequestHeaderLength +
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sizeof(TPM_CAPABILITY_AREA),
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sizeof(uint32_t), sizeof(uint32_t));
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AddInitializedField(cmd, kTpmRequestHeaderLength +
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sizeof(TPM_CAPABILITY_AREA) + sizeof(uint32_t),
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sizeof(uint32_t), TPM_CAP_PROP_OWNER);
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return cmd;
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}
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Command* BuildGetRandomCommand(void) {
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int size = kTpmRequestHeaderLength + sizeof(uint32_t);
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Command* cmd = newCommand(TPM_ORD_GetRandom, size);
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cmd->name = "tpm_get_random_cmd";
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AddVisibleField(cmd, "bytesRequested", kTpmRequestHeaderLength);
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return cmd;
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}
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/* Output the fields of a structure.
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*/
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void OutputFields(Field* fld) {
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/*
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* Field order is reversed.
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*/
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if (fld != NULL) {
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OutputFields(fld->next);
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if (fld->visible) {
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printf(" uint16_t %s;\n", fld->name);
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}
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}
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}
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/* Outputs a structure initializer.
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*/
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int OutputBytes_(Command* cmd, Field* fld) {
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int cursor = 0;
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int i;
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/*
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* Field order is reversed.
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*/
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if (fld != NULL) {
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cursor = OutputBytes_(cmd, fld->next);
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} else {
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return 0;
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}
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if (!fld->visible) {
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/*
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* Catch up missing fields.
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*/
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assert(fld->offset >= cursor);
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for (i = 0; i < fld->offset - cursor; i++) {
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printf("0, ");
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}
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cursor = fld->offset;
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switch (fld->size) {
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case 1:
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printf("0x%x, ", fld->value);
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cursor += 1;
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break;
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case 2:
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printf("0x%x, 0x%x, ", fld->value >> 8, fld->value & 0xff);
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cursor += 2;
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break;
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case 4:
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printf("0x%x, 0x%x, 0x%x, 0x%x, ", fld->value >> 24,
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(fld->value >> 16) & 0xff,
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(fld->value >> 8) & 0xff,
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fld->value & 0xff);
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cursor += 4;
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break;
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default:
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fprintf(stderr, "invalid field size %d\n", fld->size);
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exit(1);
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break;
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}
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}
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return cursor;
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}
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/* Helper to output a structure initializer.
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*/
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void OutputBytes(Command* cmd) {
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(void) OutputBytes_(cmd, cmd->fields);
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}
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void OutputFieldPointers(Command* cmd, Field* fld) {
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if (fld == NULL) {
|
|
return;
|
|
} else {
|
|
OutputFieldPointers(cmd, fld->next);
|
|
if (fld->visible) {
|
|
printf("%d, ", fld->offset);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Outputs the structure initializers for all commands.
|
|
*/
|
|
void OutputCommands(Command* cmd) {
|
|
if (cmd == NULL) {
|
|
return;
|
|
} else {
|
|
printf("const struct s_%s{\n uint8_t buffer[%d];\n",
|
|
cmd->name, cmd->size == 0 ? cmd->max_size : cmd->size);
|
|
OutputFields(cmd->fields);
|
|
printf("} %s = {{", cmd->name);
|
|
OutputBytes(cmd);
|
|
printf("},\n");
|
|
OutputFieldPointers(cmd, cmd->fields);
|
|
printf("};\n\n");
|
|
}
|
|
OutputCommands(cmd->next);
|
|
}
|
|
|
|
Command* (*builders[])(void) = {
|
|
BuildDefineSpaceCommand,
|
|
BuildWriteCommand,
|
|
BuildReadCommand,
|
|
BuildPCRReadCommand,
|
|
BuildPPAssertCommand,
|
|
BuildPPEnableCommand,
|
|
BuildPPLockCommand,
|
|
BuildFinalizePPCommand,
|
|
BuildStartupCommand,
|
|
BuildSaveStateCommand,
|
|
BuildResumeCommand,
|
|
BuildSelftestfullCommand,
|
|
BuildContinueSelfTestCommand,
|
|
BuildReadPubekCommand,
|
|
BuildForceClearCommand,
|
|
BuildPhysicalDisableCommand,
|
|
BuildPhysicalEnableCommand,
|
|
BuildPhysicalSetDeactivatedCommand,
|
|
BuildGetFlagsCommand,
|
|
BuildGetSTClearFlagsCommand,
|
|
BuildGetPermissionsCommand,
|
|
BuildGetOwnershipCommand,
|
|
BuildGetRandomCommand,
|
|
BuildExtendCommand,
|
|
};
|
|
|
|
static void FreeFields(Field* fld) {
|
|
if (fld != NULL) {
|
|
Field* next_field = fld->next;
|
|
free(fld);
|
|
FreeFields(next_field);
|
|
}
|
|
}
|
|
|
|
static void FreeCommands(Command* cmd) {
|
|
if (cmd != NULL) {
|
|
Command* next_command = cmd->next;
|
|
FreeFields(cmd->fields);
|
|
free(cmd);
|
|
FreeCommands(next_command);
|
|
}
|
|
}
|
|
|
|
int main(void) {
|
|
Command* commands = NULL;
|
|
int i;
|
|
for (i = 0; i < sizeof(builders) / sizeof(builders[0]); i++) {
|
|
Command* cmd = builders[i]();
|
|
cmd->next = commands;
|
|
commands = cmd;
|
|
}
|
|
|
|
printf("/* This file is automatically generated */\n\n");
|
|
OutputCommands(commands);
|
|
printf("const int kWriteInfoLength = %d;\n", (int) sizeof(TPM_WRITE_INFO));
|
|
printf("const int kNvDataPublicPermissionsOffset = %d;\n",
|
|
(int) (offsetof(TPM_NV_DATA_PUBLIC, permission) +
|
|
2 * PCR_SELECTION_FIX +
|
|
offsetof(TPM_NV_ATTRIBUTES, attributes)));
|
|
|
|
FreeCommands(commands);
|
|
return 0;
|
|
}
|