Momentum-Apps/totp/cli/plugins/pin/pin.c

#include <flipper_application/flipper_application.h>
#include <lib/toolbox/args.h>
#include "../../cli_helpers.h"
#include "../../cli_shared_methods.h"
#include "../../cli_plugin_interface.h"
#include "../../../types/token_info.h"
#include "../../../types/user_pin_codes.h"
#include "../../../services/config/config.h"
#include "../../../services/crypto/crypto_facade.h"
#include "../../../ui/scene_director.h"
#include "../../../lib/polyfills/memset_s.h"

#define TOTP_CLI_COMMAND_PIN_COMMAND_SET "set"
#define TOTP_CLI_COMMAND_PIN_COMMAND_REMOVE "remove"
#define TOTP_CLI_COMMAND_PIN_ARG_NEW_CRYPTO_KEY_SLOT_PREFIX "-c"

static inline uint8_t totp_cli_key_to_pin_code(uint8_t key) {
    uint8_t code = 0;
    switch(key) {
    case 0x44: // left
        code = PinCodeArrowLeft;
        break;
    case 0x41: // up
        code = PinCodeArrowUp;
        break;
    case 0x43: // right
        code = PinCodeArrowRight;
        break;
    case 0x42: // down
        code = PinCodeArrowDown;
        break;
    default:
        break;
    }

    return code;
}

static bool totp_cli_read_pin(PipeSide* pipe, uint8_t* pin, uint8_t* pin_length) {
    TOTP_CLI_PRINTF("Enter new PIN (use arrow keys on your keyboard): ");
    fflush(stdout);
    uint8_t c;
    *pin_length = 0;
    while(pipe_receive(pipe, &c, 1) == 1) {
        if(c == CliKeyEsc) {
            uint8_t c2;
            uint8_t c3;
            if(pipe_receive(pipe, &c2, 1) == 1 && pipe_receive(pipe, &c3, 1) == 1 && c2 == 0x5b) {
                uint8_t code = totp_cli_key_to_pin_code(c3);
                if(code > 0) {
                    pin[*pin_length] = code;
                    *pin_length = *pin_length + 1;
                    putc('*', stdout);
                    fflush(stdout);
                }
            }
        } else if(c == CliKeyETX) {
            TOTP_CLI_DELETE_CURRENT_LINE();
            TOTP_CLI_PRINTF_INFO("Cancelled by user\r\n");
            return false;
        } else if(c == CliKeyBackspace || c == CliKeyDEL) {
            if(*pin_length > 0) {
                *pin_length = *pin_length - 1;
                pin[*pin_length] = 0;
                TOTP_CLI_DELETE_LAST_CHAR();
            }
        } else if(c == CliKeyCR) {
            TOTP_CLI_NL();
            break;
        }
    }

    TOTP_CLI_DELETE_LAST_LINE();
    return true;
}

static void handle(PluginState* plugin_state, FuriString* args, PipeSide* pipe) {
    UNUSED(plugin_state);
    FuriString* temp_str = furi_string_alloc();

    bool do_change = false;
    bool do_remove = false;
    uint8_t crypto_key_slot = plugin_state->crypto_settings.crypto_key_slot;

    bool arguments_parsed = true;
    while(args_read_string_and_trim(args, temp_str)) {
        if(furi_string_cmpi_str(temp_str, TOTP_CLI_COMMAND_PIN_COMMAND_SET) == 0) {
            do_change = true;
        } else if(furi_string_cmpi_str(temp_str, TOTP_CLI_COMMAND_PIN_COMMAND_REMOVE) == 0) {
            do_remove = true;
        } else if(
            furi_string_cmpi_str(temp_str, TOTP_CLI_COMMAND_PIN_ARG_NEW_CRYPTO_KEY_SLOT_PREFIX) ==
            0) {
            if(!args_read_uint8_and_trim(args, &crypto_key_slot) ||
               !totp_crypto_check_key_slot(crypto_key_slot)) {
                TOTP_CLI_PRINTF_ERROR("Slot \"%" PRIu8 "\" can not be used\r\n", crypto_key_slot);
                arguments_parsed = false;
                break;
            }
        } else {
            TOTP_CLI_PRINT_INVALID_ARGUMENTS();
            arguments_parsed = false;
            break;
        }
    }

    if(!(do_change || do_remove) || (do_change && do_remove)) {
        TOTP_CLI_PRINT_INVALID_ARGUMENTS();
        arguments_parsed = false;
    }

    if(arguments_parsed && totp_cli_ensure_authenticated(plugin_state, pipe)) {
        TOTP_CLI_LOCK_UI(plugin_state);
        do {
            uint8_t new_pin[CRYPTO_IV_LENGTH];
            memset(&new_pin[0], 0, CRYPTO_IV_LENGTH);
            uint8_t new_pin_length = 0;
            if(do_change) {
                if(!totp_cli_read_pin(pipe, &new_pin[0], &new_pin_length)) {
                    memset_s(&new_pin[0], CRYPTO_IV_LENGTH, 0, CRYPTO_IV_LENGTH);
                    break;
                }
            } else if(do_remove) {
                new_pin_length = 0;
                memset(&new_pin[0], 0, CRYPTO_IV_LENGTH);
            }

            char* backup_path = totp_config_file_backup(plugin_state);
            if(backup_path != NULL) {
                TOTP_CLI_PRINTF_WARNING("Backup conf file %s has been created\r\n", backup_path);
                TOTP_CLI_PRINTF_WARNING(
                    "Once you make sure everything is fine and works as expected, please delete this backup file\r\n");
                free(backup_path);
            } else {
                memset_s(&new_pin[0], CRYPTO_IV_LENGTH, 0, CRYPTO_IV_LENGTH);
                TOTP_CLI_PRINTF_ERROR(
                    "An error has occurred during taking backup of config file\r\n");
                break;
            }

            TOTP_CLI_PRINTF("Encrypting...\r\n");

            bool update_result = totp_config_file_update_encryption(
                plugin_state, crypto_key_slot, new_pin, new_pin_length);

            memset_s(&new_pin[0], CRYPTO_IV_LENGTH, 0, CRYPTO_IV_LENGTH);

            TOTP_CLI_DELETE_LAST_LINE();

            if(update_result) {
                if(do_change) {
                    TOTP_CLI_PRINTF_SUCCESS("PIN has been successfully changed\r\n");
                } else if(do_remove) {
                    TOTP_CLI_PRINTF_SUCCESS("PIN has been successfully removed\r\n");
                }
            } else {
                TOTP_CLI_PRINT_ERROR_UPDATING_CONFIG_FILE();
            }

        } while(false);

        TOTP_CLI_UNLOCK_UI(plugin_state);
    }

    furi_string_free(temp_str);
}

static const CliPlugin plugin = {.name = "TOTP CLI Plugin: PIN", .handle = &handle};

static const FlipperAppPluginDescriptor plugin_descriptor = {
    .appid = PLUGIN_APP_ID,
    .ep_api_version = PLUGIN_API_VERSION,
    .entry_point = &plugin,
};

const FlipperAppPluginDescriptor* totp_cli_pin_plugin_ep() {
    return &plugin_descriptor;
}