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/* SPDX-License-Identifier: BSD-3-Clause */
#include <stdbool.h>
#include <stdlib.h>
#include <stdint.h>
#include <tss2/tss2_mu.h>
#include "files.h"
#include "log.h"
#include "tpm2_convert.h"
#include "tpm2_identity_util.h"
#include "tpm2_tool.h"
typedef struct tpm2_tr_encode_ctx tpm2_tr_encode_ctx;
struct tpm2_tr_encode_ctx {
const char *context_arg;
const char *public_arg;
const char *output_arg;
};
static tpm2_tr_encode_ctx ctx;
static bool tpm2_util_persistent_to_esys_tr(TPM2_HANDLE handle, TPM2B_PUBLIC *public, TPM2B_NAME *name, uint8_t **tr_buf, size_t *size) {
#define IESYSC_KEY_RSRC 1
/*
* So this is the format of an ESYS_TR:
* 4 bytes TPM2_HANDLE
* TPM2B_NAME
* 4 bytes resource type
* TPM2B_PUBLIC
*/
/* can only serialize persistent objects */
if ((handle >> TPM2_HR_SHIFT) != TPM2_HT_PERSISTENT) {
LOG_ERR("Handle must be persistent, got: 0x%x", handle);
return false;
}
/* Step 1 calculate the size */
size_t buf_size = SIZE_MAX;
size_t offset = 0;
void *buffer = NULL;
for (unsigned i=0; i < 2; i++) {
TSS2_RC rc = Tss2_MU_TPM2_HANDLE_Marshal(
handle,
buffer,
buf_size,
&offset);
if (rc != TSS2_RC_SUCCESS) {
LOG_PERR(Tss2_MU_TPM2_HANDLE_Marshal, rc);
free(buffer);
return false;
}
rc = Tss2_MU_TPM2B_NAME_Marshal(
name,
buffer,
buf_size,
&offset);
if (rc != TSS2_RC_SUCCESS) {
LOG_PERR(Tss2_MU_TPM2B_NAME_Marshal, rc);
free(buffer);
return false;
}
rc = Tss2_MU_UINT32_Marshal(
IESYSC_KEY_RSRC,
buffer,
buf_size,
&offset);
if (rc != TSS2_RC_SUCCESS) {
LOG_PERR(Tss2_MU_UINT32_Marshal, rc);
free(buffer);
return false;
}
rc = Tss2_MU_TPM2B_PUBLIC_Marshal(
public,
buffer,
buf_size,
&offset);
if (rc != TSS2_RC_SUCCESS) {
LOG_PERR(Tss2_MU_TPM2B_PUBLIC_Marshal, rc);
free(buffer);
return false;
}
/*
* on the first time through allocate the buffer for population on
* the next loop
*/
if (i == 0) {
buf_size = offset;
offset = 0;
buffer = calloc(1, buf_size);
if (!buffer) {
return 1;
}
}
}
*size = offset;
*tr_buf = buffer;
return true;
}
static bool on_option(char key, char *value) {
switch (key) {
case 'c':
ctx.context_arg = value;
break;
case 'u':
ctx.public_arg = value;
break;
case 'o':
ctx.output_arg = value;
break;
}
return true;
}
static bool tpm2_tool_onstart(tpm2_options **opts) {
const struct option topts[] = {
{ "object-context", required_argument, NULL, 'c' },
{ "public", required_argument, NULL, 'u' },
{ "output", required_argument, NULL, 'o' },
};
*opts = tpm2_options_new("c:u:o:", ARRAY_LEN(topts), topts, on_option,
NULL, TPM2_OPTIONS_NO_SAPI);
return *opts != NULL;
}
static bool check_options(void) {
bool result = true;
if (!ctx.context_arg) {
LOG_ERR("Object Handle must be specified by option \"-c\"");
result = false;
}
if (!ctx.public_arg) {
LOG_ERR("Objects expected TPM2B_PUBLIC must be specified by option \"-u\"");
result = false;
}
if (!ctx.output_arg) {
LOG_ERR("The output file for the generated serialized ESYS_TR must be specified by option \"-o\"");
result = false;
}
return result;
}
static tool_rc tpm2_tool_onrun(ESYS_CONTEXT *ectx, tpm2_option_flags flags) {
UNUSED(flags);
UNUSED(ectx);
bool result = check_options();
if (!result) {
return tool_rc_option_error;
}
TPMI_RH_PROVISION handle;
result = tpm2_util_handle_from_optarg(ctx.context_arg, &handle, TPM2_HANDLES_FLAGS_PERSISTENT);
if (!result) {
return tool_rc_option_error;
}
TPM2B_PUBLIC pub = { 0 };
result = files_load_public(ctx.public_arg, &pub);
if (!result) {
LOG_ERR("Failed to load public key \"%s\"", ctx.public_arg);
return tool_rc_option_error;
}
/* calculate the name */
TPM2B_NAME name = TPM2B_TYPE_INIT(TPM2B_NAME, name);
result = tpm2_identity_create_name(&pub, &name);
if (!result) {
LOG_ERR("Failed to calculate name");
return tool_rc_general_error;
}
uint8_t *buf = NULL;
size_t buf_size = 0;
result = tpm2_util_persistent_to_esys_tr(handle, &pub, &name, &buf, &buf_size);
if (!result) {
LOG_ERR("Could not convert to serialized ESYS_TR");
return tool_rc_general_error;
}
result = files_save_bytes_to_file(ctx.output_arg, buf,
buf_size);
free(buf);
return result ? tool_rc_success : tool_rc_general_error;
}
// Register this tool with tpm2_tool.c
TPM2_TOOL_REGISTER("tr_encode", tpm2_tool_onstart, tpm2_tool_onrun, NULL, NULL)
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