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use device::{Device, DeviceWrapper, Pro, Storage};
use libc;
use nitrokey_sys;
use util::{get_command_result, get_cstring, get_last_error, result_from_string, CommandError};
/// The number of slots in a [`PasswordSafe`][].
///
/// [`PasswordSafe`]: struct.PasswordSafe.html
pub const SLOT_COUNT: u8 = 16;
/// A password safe on a Nitrokey device.
///
/// The password safe stores a tuple consisting of a name, a login and a password on a slot. The
/// number of available slots is [`SLOT_COUNT`][]. The slots are addressed starting with zero. To
/// retrieve a password safe from a Nitrokey device, use the [`get_password_safe`][] method from
/// the [`GetPasswordSafe`][] trait. Note that the device must live at least as long as the
/// password safe.
///
/// Once the password safe has been unlocked, it can be accessed without a password. Therefore it
/// is mandatory to call [`lock`][] on the corresponding device after the password store is used.
/// As this command may have side effects on the Nitrokey Storage, it cannot be called
/// automatically once the password safe is destroyed.
///
/// # Examples
///
/// Open a password safe and access a password:
///
/// ```no_run
/// use nitrokey::{Device, GetPasswordSafe, PasswordSafe};
/// # use nitrokey::CommandError;
///
/// fn use_password_safe(pws: &PasswordSafe) -> Result<(), CommandError> {
/// let name = pws.get_slot_name(0)?;
/// let login = pws.get_slot_login(0)?;
/// let password = pws.get_slot_login(0)?;
/// println!("Credentials for {}: login {}, password {}", name, login, password);
/// Ok(())
/// }
///
/// # fn try_main() -> Result<(), CommandError> {
/// let device = nitrokey::connect()?;
/// let pws = device.get_password_safe("123456")?;
/// use_password_safe(&pws);
/// device.lock()?;
/// # Ok(())
/// # }
/// ```
///
/// [`SLOT_COUNT`]: constant.SLOT_COUNT.html
/// [`get_password_safe`]: trait.GetPasswordSafe.html#method.get_password_safe
/// [`lock`]: trait.Device.html#method.lock
/// [`GetPasswordSafe`]: trait.GetPasswordSafe.html
pub struct PasswordSafe<'a> {
_device: &'a Device,
}
/// Provides access to a [`PasswordSafe`][].
///
/// The device that implements this trait must always live at least as long as a password safe
/// retrieved from it.
///
/// [`PasswordSafe`]: struct.PasswordSafe.html
pub trait GetPasswordSafe {
/// Enables and returns the password safe.
///
/// The underlying device must always live at least as long as a password safe retrieved from
/// it. It is mandatory to lock the underlying device using [`lock`][] after the password safe
/// has been used. Otherwise, other applications can access the password store without
/// authentication.
///
/// # Errors
///
/// - [`InvalidString`][] if one of the provided passwords contains a null byte
/// - [`WrongPassword`][] if the current user password is wrong
///
/// # Example
///
/// ```no_run
/// use nitrokey::{Device, GetPasswordSafe, PasswordSafe};
/// # use nitrokey::CommandError;
///
/// fn use_password_safe(pws: &PasswordSafe) {}
///
/// # fn try_main() -> Result<(), CommandError> {
/// let device = nitrokey::connect()?;
/// match device.get_password_safe("123456") {
/// Ok(pws) => {
/// use_password_safe(&pws);
/// device.lock()?;
/// },
/// Err(err) => println!("Could not open the password safe: {}", err),
/// };
/// # Ok(())
/// # }
/// ```
///
/// [`device`]: struct.PasswordSafe.html#method.device
/// [`lock`]: trait.Device.html#method.lock
/// [`InvalidString`]: enum.CommandError.html#variant.InvalidString
/// [`WrongPassword`]: enum.CommandError.html#variant.WrongPassword
fn get_password_safe(&self, user_pin: &str) -> Result<PasswordSafe, CommandError>;
}
fn get_password_safe<'a>(
device: &'a Device,
user_pin: &str,
) -> Result<PasswordSafe<'a>, CommandError> {
let user_pin_string = get_cstring(user_pin)?;
let result = unsafe {
get_command_result(nitrokey_sys::NK_enable_password_safe(
user_pin_string.as_ptr(),
))
};
result.map(|()| PasswordSafe { _device: device })
}
impl<'a> PasswordSafe<'a> {
/// Returns the status of all password slots.
///
/// The status indicates whether a slot is programmed or not.
///
/// # Example
///
/// ```no_run
/// use nitrokey::{GetPasswordSafe, SLOT_COUNT};
/// # use nitrokey::CommandError;
///
/// # fn try_main() -> Result<(), CommandError> {
/// let device = nitrokey::connect()?;
/// let pws = device.get_password_safe("123456")?;
/// pws.get_slot_status()?.iter().enumerate().for_each(|(slot, programmed)| {
/// let status = match *programmed {
/// true => "programmed",
/// false => "not programmed",
/// };
/// println!("Slot {}: {}", slot, status);
/// });
/// # Ok(())
/// # }
/// ```
pub fn get_slot_status(&self) -> Result<[bool; SLOT_COUNT as usize], CommandError> {
let status_ptr = unsafe { nitrokey_sys::NK_get_password_safe_slot_status() };
if status_ptr.is_null() {
return Err(get_last_error());
}
let status_array_ptr = status_ptr as *const [u8; SLOT_COUNT as usize];
let status_array = unsafe { *status_array_ptr };
let mut result = [false; SLOT_COUNT as usize];
for i in 0..SLOT_COUNT {
result[i as usize] = status_array[i as usize] == 1;
}
unsafe {
libc::free(status_ptr as *mut libc::c_void);
}
Ok(result)
}
/// Returns the name of the given slot (if it is programmed).
///
/// # Errors
///
/// - [`InvalidSlot`][] if the given slot is out of range
/// - [`Unknown`][] if the slot is not programmed
///
/// # Example
///
/// ```no_run
/// use nitrokey::GetPasswordSafe;
/// # use nitrokey::CommandError;
///
/// # fn try_main() -> Result<(), CommandError> {
/// let device = nitrokey::connect()?;
/// match device.get_password_safe("123456") {
/// Ok(pws) => {
/// let name = pws.get_slot_name(0)?;
/// let login = pws.get_slot_login(0)?;
/// let password = pws.get_slot_login(0)?;
/// println!("Credentials for {}: login {}, password {}", name, login, password);
/// },
/// Err(err) => println!("Could not open the password safe: {}", err),
/// };
/// # Ok(())
/// # }
/// ```
///
/// [`InvalidSlot`]: enum.CommandError.html#variant.InvalidSlot
/// [`Unknown`]: enum.CommandError.html#variant.Unknown
pub fn get_slot_name(&self, slot: u8) -> Result<String, CommandError> {
unsafe { result_from_string(nitrokey_sys::NK_get_password_safe_slot_name(slot)) }
}
/// Returns the login for the given slot (if it is programmed).
///
/// # Errors
///
/// - [`InvalidSlot`][] if the given slot is out of range
/// - [`Unknown`][] if the slot is not programmed
///
/// # Example
///
/// ```no_run
/// use nitrokey::GetPasswordSafe;
/// # use nitrokey::CommandError;
///
/// # fn try_main() -> Result<(), CommandError> {
/// let device = nitrokey::connect()?;
/// let pws = device.get_password_safe("123456")?;
/// let name = pws.get_slot_name(0)?;
/// let login = pws.get_slot_login(0)?;
/// let password = pws.get_slot_login(0)?;
/// println!("Credentials for {}: login {}, password {}", name, login, password);
/// # Ok(())
/// # }
/// ```
///
/// [`InvalidSlot`]: enum.CommandError.html#variant.InvalidSlot
/// [`Unknown`]: enum.CommandError.html#variant.Unknown
pub fn get_slot_login(&self, slot: u8) -> Result<String, CommandError> {
unsafe { result_from_string(nitrokey_sys::NK_get_password_safe_slot_login(slot)) }
}
/// Returns the password for the given slot (if it is programmed).
///
/// # Errors
///
/// - [`InvalidSlot`][] if the given slot is out of range
/// - [`Unknown`][] if the slot is not programmed
///
/// # Example
///
/// ```no_run
/// use nitrokey::GetPasswordSafe;
/// # use nitrokey::CommandError;
///
/// # fn try_main() -> Result<(), CommandError> {
/// let device = nitrokey::connect()?;
/// let pws = device.get_password_safe("123456")?;
/// let name = pws.get_slot_name(0)?;
/// let login = pws.get_slot_login(0)?;
/// let password = pws.get_slot_login(0)?;
/// println!("Credentials for {}: login {}, password {}", name, login, password);
/// # Ok(())
/// # }
/// ```
///
/// [`InvalidSlot`]: enum.CommandError.html#variant.InvalidSlot
/// [`Unknown`]: enum.CommandError.html#variant.Unknown
pub fn get_slot_password(&self, slot: u8) -> Result<String, CommandError> {
unsafe { result_from_string(nitrokey_sys::NK_get_password_safe_slot_password(slot)) }
}
/// Writes the given slot with the given name, login and password.
///
/// # Errors
///
/// - [`InvalidSlot`][] if the given slot is out of range
/// - [`InvalidString`][] if the provided token ID contains a null byte
///
/// # Example
///
/// ```no_run
/// use nitrokey::GetPasswordSafe;
/// # use nitrokey::CommandError;
///
/// # fn try_main() -> Result<(), CommandError> {
/// let device = nitrokey::connect()?;
/// let pws = device.get_password_safe("123456")?;
/// let name = pws.get_slot_name(0)?;
/// let login = pws.get_slot_login(0)?;
/// let password = pws.get_slot_login(0)?;
/// println!("Credentials for {}: login {}, password {}", name, login, password);
/// # Ok(())
/// # }
/// ```
///
/// [`InvalidSlot`]: enum.CommandError.html#variant.InvalidSlot
/// [`InvalidString`]: enum.CommandError.html#variant.InvalidString
pub fn write_slot(
&self,
slot: u8,
name: &str,
login: &str,
password: &str,
) -> Result<(), CommandError> {
let name_string = get_cstring(name)?;
let login_string = get_cstring(login)?;
let password_string = get_cstring(password)?;
unsafe {
get_command_result(nitrokey_sys::NK_write_password_safe_slot(
slot,
name_string.as_ptr(),
login_string.as_ptr(),
password_string.as_ptr(),
))
}
}
/// Erases the given slot. Erasing clears the stored name, login and password (if the slot was
/// programmed).
///
/// # Errors
///
/// - [`InvalidSlot`][] if the given slot is out of range
///
/// # Example
///
/// ```no_run
/// use nitrokey::GetPasswordSafe;
/// # use nitrokey::CommandError;
///
/// # fn try_main() -> Result<(), CommandError> {
/// let device = nitrokey::connect()?;
/// let pws = device.get_password_safe("123456")?;
/// match pws.erase_slot(0) {
/// Ok(()) => println!("Erased slot 0."),
/// Err(err) => println!("Could not erase slot 0: {}", err),
/// };
/// # Ok(())
/// # }
/// ```
///
/// [`InvalidSlot`]: enum.CommandError.html#variant.InvalidSlot
pub fn erase_slot(&self, slot: u8) -> Result<(), CommandError> {
unsafe { get_command_result(nitrokey_sys::NK_erase_password_safe_slot(slot)) }
}
}
impl<'a> Drop for PasswordSafe<'a> {
fn drop(&mut self) {
// TODO: disable the password safe -- NK_lock_device has side effects on the Nitrokey
// Storage, see https://github.com/Nitrokey/nitrokey-storage-firmware/issues/65
}
}
impl GetPasswordSafe for Pro {
fn get_password_safe(&self, user_pin: &str) -> Result<PasswordSafe, CommandError> {
get_password_safe(self, user_pin)
}
}
impl GetPasswordSafe for Storage {
fn get_password_safe(&self, user_pin: &str) -> Result<PasswordSafe, CommandError> {
get_password_safe(self, user_pin)
}
}
impl GetPasswordSafe for DeviceWrapper {
fn get_password_safe(&self, user_pin: &str) -> Result<PasswordSafe, CommandError> {
get_password_safe(self, user_pin)
}
}