mirror of
https://github.com/tillitis/tillitis-key1.git
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2cb5f2eca6
Based on earlier code by Daniel Jobson <jobson@tillitis.se> now integrated into the new world order. Co-authored-by: Mikael Ågren <mikael@tillitis.se> Co-authored-by: Daniel Jobson <jobson@tillitis.se>
76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
// Copyright (C) 2024 - Tillitis AB
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// SPDX-License-Identifier: GPL-2.0-only
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#include <tkey/lib.h>
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#include <stdbool.h>
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#include "mgmt_app.h"
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#include "auth_app.h"
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#include "partition_table.h"
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/* Returns true if an management app is already registered */
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static bool mgmt_app_registered(struct management_app_metadata *mgmt_table)
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{
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if (mgmt_table->status == 0x00) {
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/* No management app registered */
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return false;
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// TODO: Should we also check nonce, authentication digest for
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// non-zero?
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}
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return true;
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}
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/* Authenticate an management app */
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bool mgmt_app_authenticate(struct management_app_metadata *mgmt_table)
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{
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if (!mgmt_app_registered(mgmt_table)) {
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return false;
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}
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return auth_app_authenticate(&mgmt_table->auth);
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}
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/* Register an management app, returns zero on success */
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int mgmt_app_register(struct partition_table *part_table)
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{
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/* Check if the current app is the mgmt app */
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if (mgmt_app_authenticate(&part_table->mgmt_app_data)) {
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return 0;
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}
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/* Check if another management app is registered */
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if (mgmt_app_registered(&part_table->mgmt_app_data)) {
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return -1;
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}
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auth_app_create(&part_table->mgmt_app_data.auth);
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part_table->mgmt_app_data.status = 0x01;
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part_table_write(part_table);
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return 0;
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}
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/* Unregister the currently registered app, returns zero on success */
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int mgmt_app_unregister(struct partition_table *part_table)
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{
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/* Only the management app should be able to unregister itself */
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if (!mgmt_app_authenticate(&part_table->mgmt_app_data)) {
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return -1;
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}
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part_table->mgmt_app_data.status = 0;
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memset(part_table->mgmt_app_data.auth.nonce, 0x00,
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sizeof(part_table->mgmt_app_data.auth.nonce));
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memset(part_table->mgmt_app_data.auth.authentication_digest, 0x00,
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sizeof(part_table->mgmt_app_data.auth.authentication_digest));
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part_table_write(part_table);
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return 0;
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}
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