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// Copyright (C) 2018-2019 Robin Krahl <robin.krahl@ireas.org>
// SPDX-License-Identifier: MIT
use std::ffi::CString;
use nitrokey_sys;
use crate::error::Error;
use crate::util::{get_command_result, get_cstring, result_from_string};
/// Modes for one-time password generation.
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum OtpMode {
/// Generate one-time passwords with six digits.
SixDigits,
/// Generate one-time passwords with eight digits.
EightDigits,
}
/// Provides methods to configure and erase OTP slots on a Nitrokey device.
pub trait ConfigureOtp {
/// Configure an HOTP slot with the given data and set the HOTP counter to the given value
/// (default 0).
///
/// # Errors
///
/// - [`InvalidSlot`][] if there is no slot with the given number
/// - [`InvalidString`][] if the provided token ID contains a null byte
/// - [`NoName`][] if the provided name is empty
///
/// # Example
///
/// ```no_run
/// use nitrokey::{Authenticate, ConfigureOtp, OtpMode, OtpSlotData};
/// # use nitrokey::Error;
///
/// # fn try_main() -> Result<(), Error> {
/// let mut manager = nitrokey::take()?;
/// let device = manager.connect()?;
/// let slot_data = OtpSlotData::new(1, "test", "01234567890123456689", OtpMode::SixDigits);
/// match device.authenticate_admin("12345678") {
/// Ok(mut admin) => {
/// match admin.write_hotp_slot(slot_data, 0) {
/// Ok(()) => println!("Successfully wrote slot."),
/// Err(err) => eprintln!("Could not write slot: {}", err),
/// }
/// },
/// Err((_, err)) => eprintln!("Could not authenticate as admin: {}", err),
/// }
/// # Ok(())
/// # }
/// ```
///
/// [`InvalidSlot`]: enum.LibraryError.html#variant.InvalidSlot
/// [`InvalidString`]: enum.LibraryError.html#variant.InvalidString
/// [`NoName`]: enum.CommandError.html#variant.NoName
fn write_hotp_slot(&mut self, data: OtpSlotData, counter: u64) -> Result<(), Error>;
/// Configure a TOTP slot with the given data and set the TOTP time window to the given value
/// (default 30).
///
/// # Errors
///
/// - [`InvalidSlot`][] if there is no slot with the given number
/// - [`InvalidString`][] if the provided token ID contains a null byte
/// - [`NoName`][] if the provided name is empty
///
/// # Example
///
/// ```no_run
/// use nitrokey::{Authenticate, ConfigureOtp, OtpMode, OtpSlotData};
/// # use nitrokey::Error;
///
/// # fn try_main() -> Result<(), Error> {
/// let mut manager = nitrokey::take()?;
/// let device = manager.connect()?;
/// let slot_data = OtpSlotData::new(1, "test", "01234567890123456689", OtpMode::EightDigits);
/// match device.authenticate_admin("12345678") {
/// Ok(mut admin) => {
/// match admin.write_totp_slot(slot_data, 30) {
/// Ok(()) => println!("Successfully wrote slot."),
/// Err(err) => eprintln!("Could not write slot: {}", err),
/// }
/// },
/// Err((_, err)) => eprintln!("Could not authenticate as admin: {}", err),
/// }
/// # Ok(())
/// # }
/// ```
///
/// [`InvalidSlot`]: enum.LibraryError.html#variant.InvalidSlot
/// [`InvalidString`]: enum.LibraryError.html#variant.InvalidString
/// [`NoName`]: enum.CommandError.html#variant.NoName
fn write_totp_slot(&mut self, data: OtpSlotData, time_window: u16) -> Result<(), Error>;
/// Erases an HOTP slot.
///
/// # Errors
///
/// - [`InvalidSlot`][] if there is no slot with the given number
///
/// # Example
///
/// ```no_run
/// use nitrokey::{Authenticate, ConfigureOtp};
/// # use nitrokey::Error;
///
/// # fn try_main() -> Result<(), Error> {
/// let mut manager = nitrokey::take()?;
/// let device = manager.connect()?;
/// match device.authenticate_admin("12345678") {
/// Ok(mut admin) => {
/// match admin.erase_hotp_slot(1) {
/// Ok(()) => println!("Successfully erased slot."),
/// Err(err) => eprintln!("Could not erase slot: {}", err),
/// }
/// },
/// Err((_, err)) => eprintln!("Could not authenticate as admin: {}", err),
/// }
/// # Ok(())
/// # }
/// ```
///
/// [`InvalidSlot`]: enum.LibraryError.html#variant.InvalidSlot
fn erase_hotp_slot(&mut self, slot: u8) -> Result<(), Error>;
/// Erases a TOTP slot.
///
/// # Errors
///
/// - [`InvalidSlot`][] if there is no slot with the given number
///
/// # Example
///
/// ```no_run
/// use nitrokey::{Authenticate, ConfigureOtp};
/// # use nitrokey::Error;
///
/// # fn try_main() -> Result<(), Error> {
/// let mut manager = nitrokey::take()?;
/// let device = manager.connect()?;
/// match device.authenticate_admin("12345678") {
/// Ok(mut admin) => {
/// match admin.erase_totp_slot(1) {
/// Ok(()) => println!("Successfully erased slot."),
/// Err(err) => eprintln!("Could not erase slot: {}", err),
/// }
/// },
/// Err((_, err)) => eprintln!("Could not authenticate as admin: {}", err),
/// }
/// # Ok(())
/// # }
/// ```
///
/// [`InvalidSlot`]: enum.LibraryError.html#variant.InvalidSlot
fn erase_totp_slot(&mut self, slot: u8) -> Result<(), Error>;
}
/// Provides methods to generate OTP codes and to query OTP slots on a Nitrokey
/// device.
pub trait GenerateOtp {
/// Sets the time on the Nitrokey.
///
/// `time` is the number of seconds since January 1st, 1970 (Unix timestamp). Unless `force`
/// is set to `true`, this command fails if the timestamp on the device is larger than the
/// given timestamp or if it is zero.
///
/// The time is used for TOTP generation (see [`get_totp_code`][]).
///
/// # Example
///
/// ```no_run
/// use std::time;
/// use nitrokey::GenerateOtp;
/// # use nitrokey::Error;
///
/// # fn try_main() -> Result<(), Error> {
/// let mut manager = nitrokey::take()?;
/// let mut device = manager.connect()?;
/// let time = time::SystemTime::now().duration_since(time::UNIX_EPOCH);
/// match time {
/// Ok(time) => device.set_time(time.as_secs(), false)?,
/// Err(_) => eprintln!("The system time is before the Unix epoch!"),
/// }
/// # Ok(())
/// # }
/// ```
///
/// # Errors
///
/// - [`Timestamp`][] if the time could not be set
///
/// [`get_totp_code`]: #method.get_totp_code
/// [`Timestamp`]: enum.CommandError.html#variant.Timestamp
fn set_time(&mut self, time: u64, force: bool) -> Result<(), Error> {
let result = if force {
unsafe { nitrokey_sys::NK_totp_set_time(time) }
} else {
unsafe { nitrokey_sys::NK_totp_set_time_soft(time) }
};
get_command_result(result)
}
/// Returns the name of the given HOTP slot.
///
/// # Errors
///
/// - [`InvalidSlot`][] if there is no slot with the given number
/// - [`SlotNotProgrammed`][] if the given slot is not configured
///
/// # Example
///
/// ```no_run
/// use nitrokey::{CommandError, Error, GenerateOtp};
///
/// # fn try_main() -> Result<(), Error> {
/// let mut manager = nitrokey::take()?;
/// let device = manager.connect()?;
/// match device.get_hotp_slot_name(1) {
/// Ok(name) => println!("HOTP slot 1: {}", name),
/// Err(Error::CommandError(CommandError::SlotNotProgrammed)) => eprintln!("HOTP slot 1 not programmed"),
/// Err(err) => eprintln!("Could not get slot name: {}", err),
/// };
/// # Ok(())
/// # }
/// ```
///
/// [`InvalidSlot`]: enum.LibraryError.html#variant.InvalidSlot
/// [`SlotNotProgrammed`]: enum.CommandError.html#variant.SlotNotProgrammed
fn get_hotp_slot_name(&self, slot: u8) -> Result<String, Error> {
result_from_string(unsafe { nitrokey_sys::NK_get_hotp_slot_name(slot) })
}
/// Returns the name of the given TOTP slot.
///
/// # Errors
///
/// - [`InvalidSlot`][] if there is no slot with the given number
/// - [`SlotNotProgrammed`][] if the given slot is not configured
///
/// # Example
///
/// ```no_run
/// use nitrokey::{CommandError, Error, GenerateOtp};
///
/// # fn try_main() -> Result<(), Error> {
/// let mut manager = nitrokey::take()?;
/// let device = manager.connect()?;
/// match device.get_totp_slot_name(1) {
/// Ok(name) => println!("TOTP slot 1: {}", name),
/// Err(Error::CommandError(CommandError::SlotNotProgrammed)) => eprintln!("TOTP slot 1 not programmed"),
/// Err(err) => eprintln!("Could not get slot name: {}", err),
/// };
/// # Ok(())
/// # }
/// ```
///
/// [`InvalidSlot`]: enum.LibraryError.html#variant.InvalidSlot
/// [`SlotNotProgrammed`]: enum.CommandError.html#variant.SlotNotProgrammed
fn get_totp_slot_name(&self, slot: u8) -> Result<String, Error> {
result_from_string(unsafe { nitrokey_sys::NK_get_totp_slot_name(slot) })
}
/// Generates an HOTP code on the given slot. This operation may require user authorization,
/// depending on the device configuration (see [`get_config`][]).
///
/// # Errors
///
/// - [`InvalidSlot`][] if there is no slot with the given number
/// - [`NotAuthorized`][] if OTP generation requires user authentication
/// - [`SlotNotProgrammed`][] if the given slot is not configured
///
/// # Example
///
/// ```no_run
/// use nitrokey::GenerateOtp;
/// # use nitrokey::Error;
///
/// # fn try_main() -> Result<(), Error> {
/// let mut manager = nitrokey::take()?;
/// let mut device = manager.connect()?;
/// let code = device.get_hotp_code(1)?;
/// println!("Generated HOTP code on slot 1: {}", code);
/// # Ok(())
/// # }
/// ```
///
/// [`get_config`]: trait.Device.html#method.get_config
/// [`InvalidSlot`]: enum.LibraryError.html#variant.InvalidSlot
/// [`NotAuthorized`]: enum.CommandError.html#variant.NotAuthorized
/// [`SlotNotProgrammed`]: enum.CommandError.html#variant.SlotNotProgrammed
fn get_hotp_code(&mut self, slot: u8) -> Result<String, Error> {
result_from_string(unsafe { nitrokey_sys::NK_get_hotp_code(slot) })
}
/// Generates a TOTP code on the given slot. This operation may require user authorization,
/// depending on the device configuration (see [`get_config`][]).
///
/// To make sure that the Nitrokey’s time is in sync, consider calling [`set_time`][] before
/// calling this method.
///
/// # Errors
///
/// - [`InvalidSlot`][] if there is no slot with the given number
/// - [`NotAuthorized`][] if OTP generation requires user authentication
/// - [`SlotNotProgrammed`][] if the given slot is not configured
///
/// # Example
///
/// ```no_run
/// use std::time;
/// use nitrokey::GenerateOtp;
/// # use nitrokey::Error;
///
/// # fn try_main() -> Result<(), Error> {
/// let mut manager = nitrokey::take()?;
/// let mut device = manager.connect()?;
/// let time = time::SystemTime::now().duration_since(time::UNIX_EPOCH);
/// match time {
/// Ok(time) => {
/// device.set_time(time.as_secs(), false)?;
/// let code = device.get_totp_code(1)?;
/// println!("Generated TOTP code on slot 1: {}", code);
/// },
/// Err(_) => eprintln!("Timestamps before 1970-01-01 are not supported!"),
/// }
/// # Ok(())
/// # }
/// ```
///
/// [`set_time`]: #method.set_time
/// [`get_config`]: trait.Device.html#method.get_config
/// [`InvalidSlot`]: enum.LibraryError.html#variant.InvalidSlot
/// [`NotAuthorized`]: enum.CommandError.html#variant.NotAuthorized
/// [`SlotNotProgrammed`]: enum.CommandError.html#variant.SlotNotProgrammed
fn get_totp_code(&self, slot: u8) -> Result<String, Error> {
result_from_string(unsafe { nitrokey_sys::NK_get_totp_code(slot, 0, 0, 0) })
}
}
/// The configuration for an OTP slot.
#[derive(Debug)]
pub struct OtpSlotData {
/// The number of the slot – must be less than three for HOTP and less than 15 for TOTP.
pub number: u8,
/// The name of the slot – must not be empty.
pub name: String,
/// The secret for the slot.
pub secret: String,
/// The OTP generation mode.
pub mode: OtpMode,
/// If true, press the enter key after sending an OTP code using double-pressed
/// numlock, capslock or scrolllock.
pub use_enter: bool,
/// Set the token ID, see [OATH Token Identifier Specification][tokspec], section “Class A”.
///
/// [tokspec]: https://openauthentication.org/token-specs/
pub token_id: Option<String>,
}
#[derive(Debug)]
pub struct RawOtpSlotData {
pub number: u8,
pub name: CString,
pub secret: CString,
pub mode: OtpMode,
pub use_enter: bool,
pub use_token_id: bool,
pub token_id: CString,
}
impl OtpSlotData {
/// Constructs a new instance of this struct.
pub fn new<S: Into<String>, T: Into<String>>(
number: u8,
name: S,
secret: T,
mode: OtpMode,
) -> OtpSlotData {
OtpSlotData {
number,
name: name.into(),
secret: secret.into(),
mode,
use_enter: false,
token_id: None,
}
}
/// Enables pressing the enter key after sending an OTP code using double-pressed numlock,
/// capslock or scrollock.
pub fn use_enter(mut self) -> OtpSlotData {
self.use_enter = true;
self
}
/// Sets the token ID, see [OATH Token Identifier Specification][tokspec], section “Class A”.
///
/// [tokspec]: https://openauthentication.org/token-specs/
pub fn token_id<S: Into<String>>(mut self, id: S) -> OtpSlotData {
self.token_id = Some(id.into());
self
}
}
impl RawOtpSlotData {
pub fn new(data: OtpSlotData) -> Result<RawOtpSlotData, Error> {
let name = get_cstring(data.name)?;
let secret = get_cstring(data.secret)?;
let use_token_id = data.token_id.is_some();
let token_id = get_cstring(data.token_id.unwrap_or_else(String::new))?;
Ok(RawOtpSlotData {
number: data.number,
name,
secret,
mode: data.mode,
use_enter: data.use_enter,
use_token_id,
token_id,
})
}
}
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