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/* SPDX-License-Identifier: BSD-3-Clause */
#include <stdlib.h>
#include "files.h"
#include "log.h"
#include "tpm2_cc_util.h"
#include "tpm2_policy.h"
#include "tpm2_tool.h"
#define MAX_SESSIONS 3
typedef struct tpm2_policycommandcode_ctx tpm2_policycommandcode_ctx;
struct tpm2_policycommandcode_ctx {
/*
* Inputs
*/
const char *session_path;
TPM2_CC command_code;
tpm2_session *session;
/*
* Outputs
*/
const char *out_policy_dgst_path;
/*
* Parameter hashes
*/
const char *cp_hash_path;
TPM2B_DIGEST cp_hash;
bool is_command_dispatch;
TPMI_ALG_HASH parameter_hash_algorithm;
};
static tpm2_policycommandcode_ctx ctx = {
.parameter_hash_algorithm = TPM2_ALG_ERROR,
};
static tool_rc tpm2_policycommandcode_build(ESYS_CONTEXT *ectx) {
tool_rc rc = tpm2_policy_build_policycommandcode(ectx, ctx.session,
ctx.command_code, &ctx.cp_hash, ctx.parameter_hash_algorithm);
if (rc != tool_rc_success) {
LOG_ERR("Could not build TPM policy_command_code");
}
return rc;
}
static tool_rc process_outputs(ESYS_CONTEXT *ectx) {
UNUSED(ectx);
/*
* 1. Outputs that do not require TPM2_CC_<command> dispatch
*/
bool is_file_op_success = true;
if (ctx.cp_hash_path) {
is_file_op_success = files_save_digest(&ctx.cp_hash, ctx.cp_hash_path);
if (!is_file_op_success) {
return tool_rc_general_error;
}
}
tool_rc rc = tool_rc_success;
if (!ctx.is_command_dispatch) {
return rc;
}
/*
* 2. Outputs generated after TPM2_CC_<command> dispatch
*/
return tpm2_policy_tool_finish(ectx, ctx.session, ctx.out_policy_dgst_path);
}
static tool_rc process_inputs(ESYS_CONTEXT *ectx) {
UNUSED(ectx);
/*
* 1. Object and auth initializations
*/
/*
* 1.a Add the new-auth values to be set for the object.
*/
/*
* 1.b Add object names and their auth sessions
*/
tool_rc rc = tpm2_session_restore(ectx, ctx.session_path, false,
&ctx.session);
if (rc != tool_rc_success) {
return rc;
}
/*
* 2. Restore auxiliary sessions
*/
/*
* 3. Command specific initializations
*/
/*
* 4. Configuration for calculating the pHash
*/
/*
* 4.a Determine pHash length and alg
*/
tpm2_session *all_sessions[MAX_SESSIONS] = {
ctx.session,
0,
0
};
const char **cphash_path = ctx.cp_hash_path ? &ctx.cp_hash_path : 0;
ctx.parameter_hash_algorithm = tpm2_util_calculate_phash_algorithm(ectx,
cphash_path, &ctx.cp_hash, 0, 0, all_sessions);
/*
* 4.b Determine if TPM2_CC_<command> is to be dispatched
*/
ctx.is_command_dispatch = ctx.cp_hash_path ? false : true;
return tool_rc_success;
}
static tool_rc check_options(void) {
if (!ctx.session_path) {
LOG_ERR("Must specify -S session file.");
return tool_rc_option_error;
}
return tool_rc_success;
}
static bool on_arg(int argc, char **argv) {
if (argc > 1) {
LOG_ERR("Specify only the TPM2 command code.");
return false;
}
if (!argc) {
LOG_ERR("TPM2 command code must be specified.");
return false;
}
bool result = tpm2_cc_util_from_str(argv[0], &ctx.command_code);
if (!result) {
return false;
}
return true;
}
static bool on_option(char key, char *value) {
switch (key) {
case 'S':
ctx.session_path = value;
break;
case 'L':
ctx.out_policy_dgst_path = value;
break;
case 0:
ctx.cp_hash_path = value;
break;
}
return true;
}
static bool tpm2_tool_onstart(tpm2_options **opts) {
static struct option topts[] = {
{ "session", required_argument, NULL, 'S' },
{ "policy", required_argument, NULL, 'L' },
{ "cphash", required_argument, NULL, 0 },
};
*opts = tpm2_options_new("S:L:", ARRAY_LEN(topts), topts, on_option, on_arg,
0);
return *opts != NULL;
}
static tool_rc tpm2_tool_onrun(ESYS_CONTEXT *ectx, tpm2_option_flags flags) {
UNUSED(flags);
/*
* 1. Process options
*/
tool_rc rc = check_options();
if (rc != tool_rc_success) {
return rc;
}
/*
* 2. Process inputs
*/
rc = process_inputs(ectx);
if (rc != tool_rc_success) {
return rc;
}
/*
* 3. TPM2_CC_<command> call
*/
rc = tpm2_policycommandcode_build(ectx);
if (rc != tool_rc_success) {
return rc;
}
/*
* 4. Process outputs
*/
return process_outputs(ectx);
}
static tool_rc tpm2_tool_onstop(ESYS_CONTEXT *ectx) {
UNUSED(ectx);
/*
* 1. Free objects
*/
/*
* 2. Close authorization sessions
*/
return tpm2_session_close(&ctx.session);
/*
* 3. Close auxiliary sessions
*/
}
// Register this tool with tpm2_tool.c
TPM2_TOOL_REGISTER("policycommandcode", tpm2_tool_onstart, tpm2_tool_onrun,
tpm2_tool_onstop, NULL)
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