From 0972bbe82623c3d9649b6023d8f50d304aa0cde6 Mon Sep 17 00:00:00 2001 From: Robin Krahl Date: Mon, 28 Jan 2019 14:24:12 +0000 Subject: Refactor User and Admin to use a mutable reference MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit In the initial nitrokey-rs implementation, the Admin and the User struct take the Device by value to make sure that the user cannot initiate a second authentication while this first is still active (which would invalidate the temporary password). Now we realized that this is not necessary – taking a mutable reference has the same effect, but leads to a much cleaner API. This patch refactors the Admin and User structs – and all dependent code – to use a mutable reference instead of a Device value. --- src/auth.rs | 183 +++++++++++++++++----------------------------------------- src/device.rs | 42 ++++---------- src/lib.rs | 4 +- src/otp.rs | 16 ++--- 4 files changed, 75 insertions(+), 170 deletions(-) (limited to 'src') diff --git a/src/auth.rs b/src/auth.rs index f9f50fa..573fed3 100644 --- a/src/auth.rs +++ b/src/auth.rs @@ -42,16 +42,10 @@ pub trait Authenticate { /// fn perform_other_task(device: &DeviceWrapper) {} /// /// # fn try_main() -> Result<(), Error> { - /// let device = nitrokey::connect()?; - /// let device = match device.authenticate_user("123456") { - /// Ok(user) => { - /// perform_user_task(&user); - /// user.device() - /// }, - /// Err((device, err)) => { - /// eprintln!("Could not authenticate as user: {}", err); - /// device - /// }, + /// let mut device = nitrokey::connect()?; + /// match device.authenticate_user("123456") { + /// Ok(user) => perform_user_task(&user), + /// Err(err) => eprintln!("Could not authenticate as user: {}", err), /// }; /// perform_other_task(&device); /// # Ok(()) @@ -61,9 +55,9 @@ pub trait Authenticate { /// [`InvalidString`]: enum.LibraryError.html#variant.InvalidString /// [`RngError`]: enum.CommandError.html#variant.RngError /// [`WrongPassword`]: enum.CommandError.html#variant.WrongPassword - fn authenticate_user(self, password: &str) -> Result, (Self, Error)> + fn authenticate_user(&mut self, password: &str) -> Result, Error> where - Self: Device + Sized; + Self: Device + std::marker::Sized; /// Performs admin authentication. This method consumes the device. If successful, an /// authenticated device is returned. Otherwise, the current unauthenticated device and the @@ -88,16 +82,10 @@ pub trait Authenticate { /// fn perform_other_task(device: &DeviceWrapper) {} /// /// # fn try_main() -> Result<(), Error> { - /// let device = nitrokey::connect()?; - /// let device = match device.authenticate_admin("123456") { - /// Ok(admin) => { - /// perform_admin_task(&admin); - /// admin.device() - /// }, - /// Err((device, err)) => { - /// eprintln!("Could not authenticate as admin: {}", err); - /// device - /// }, + /// let mut device = nitrokey::connect()?; + /// match device.authenticate_admin("123456") { + /// Ok(admin) => perform_admin_task(&admin), + /// Err(err) => eprintln!("Could not authenticate as admin: {}", err), /// }; /// perform_other_task(&device); /// # Ok(()) @@ -107,13 +95,13 @@ pub trait Authenticate { /// [`InvalidString`]: enum.LibraryError.html#variant.InvalidString /// [`RngError`]: enum.CommandError.html#variant.RngError /// [`WrongPassword`]: enum.CommandError.html#variant.WrongPassword - fn authenticate_admin(self, password: &str) -> Result, (Self, Error)> + fn authenticate_admin(&mut self, password: &str) -> Result, Error> where - Self: Device + Sized; + Self: Device + std::marker::Sized; } -trait AuthenticatedDevice { - fn new(device: T, temp_password: Vec) -> Self; +trait AuthenticatedDevice<'a, T> { + fn new(device: &'a mut T, temp_password: Vec) -> Self; fn temp_password_ptr(&self) -> *const c_char; } @@ -128,8 +116,8 @@ trait AuthenticatedDevice { /// [`authenticate_admin`]: trait.Authenticate.html#method.authenticate_admin /// [`device`]: #method.device #[derive(Debug)] -pub struct User { - device: T, +pub struct User<'a, T: Device> { + device: &'a mut T, temp_password: Vec, } @@ -143,89 +131,42 @@ pub struct User { /// [`authenticate_admin`]: trait.Authenticate.html#method.authenticate_admin /// [`device`]: #method.device #[derive(Debug)] -pub struct Admin { - device: T, +pub struct Admin<'a, T: Device> { + device: &'a mut T, temp_password: Vec, } -fn authenticate(device: D, password: &str, callback: T) -> Result +fn authenticate<'a, D, A, T>(device: &'a mut D, password: &str, callback: T) -> Result where D: Device, - A: AuthenticatedDevice, + A: AuthenticatedDevice<'a, D>, T: Fn(*const c_char, *const c_char) -> c_int, { - let temp_password = match generate_password(TEMPORARY_PASSWORD_LENGTH) { - Ok(temp_password) => temp_password, - Err(err) => return Err((device, err)), - }; - let password = match get_cstring(password) { - Ok(password) => password, - Err(err) => return Err((device, err)), - }; + let temp_password = generate_password(TEMPORARY_PASSWORD_LENGTH)?; + let password = get_cstring(password)?; let password_ptr = password.as_ptr(); let temp_password_ptr = temp_password.as_ptr() as *const c_char; match callback(password_ptr, temp_password_ptr) { 0 => Ok(A::new(device, temp_password)), - rv => Err((device, Error::from(rv))), + rv => Err(Error::from(rv)), } } -fn authenticate_user_wrapper( - device: T, - constructor: C, - password: &str, -) -> Result, (DeviceWrapper, Error)> -where - T: Device, - C: Fn(T) -> DeviceWrapper, -{ - let result = device.authenticate_user(password); - match result { - Ok(user) => Ok(User::new(constructor(user.device), user.temp_password)), - Err((device, err)) => Err((constructor(device), err)), - } -} - -fn authenticate_admin_wrapper( - device: T, - constructor: C, - password: &str, -) -> Result, (DeviceWrapper, Error)> -where - T: Device, - C: Fn(T) -> DeviceWrapper, -{ - let result = device.authenticate_admin(password); - match result { - Ok(user) => Ok(Admin::new(constructor(user.device), user.temp_password)), - Err((device, err)) => Err((constructor(device), err)), - } -} - -impl User { - /// Forgets the user authentication and returns an unauthenticated device. This method - /// consumes the authenticated device. It does not perform any actual commands on the - /// Nitrokey. - pub fn device(self) -> T { - self.device - } -} - -impl ops::Deref for User { +impl<'a, T: Device> ops::Deref for User<'a, T> { type Target = T; fn deref(&self) -> &Self::Target { - &self.device + self.device } } -impl ops::DerefMut for User { +impl<'a, T: Device> ops::DerefMut for User<'a, T> { fn deref_mut(&mut self) -> &mut T { - &mut self.device + self.device } } -impl GenerateOtp for User { +impl<'a, T: Device> GenerateOtp for User<'a, T> { fn get_hotp_code(&mut self, slot: u8) -> Result { result_from_string(unsafe { nitrokey_sys::NK_get_hotp_code_PIN(slot, self.temp_password_ptr()) @@ -239,8 +180,8 @@ impl GenerateOtp for User { } } -impl AuthenticatedDevice for User { - fn new(device: T, temp_password: Vec) -> Self { +impl<'a, T: Device> AuthenticatedDevice<'a, T> for User<'a, T> { + fn new(device: &'a mut T, temp_password: Vec) -> Self { User { device, temp_password, @@ -252,28 +193,21 @@ impl AuthenticatedDevice for User { } } -impl ops::Deref for Admin { +impl<'a, T: Device> ops::Deref for Admin<'a, T> { type Target = T; fn deref(&self) -> &Self::Target { - &self.device + self.device } } -impl ops::DerefMut for Admin { +impl<'a, T: Device> ops::DerefMut for Admin<'a, T> { fn deref_mut(&mut self) -> &mut T { - &mut self.device - } -} - -impl Admin { - /// Forgets the user authentication and returns an unauthenticated device. This method - /// consumes the authenticated device. It does not perform any actual commands on the - /// Nitrokey. - pub fn device(self) -> T { self.device } +} +impl<'a, T: Device> Admin<'a, T> { /// Writes the given configuration to the Nitrokey device. /// /// # Errors @@ -287,14 +221,11 @@ impl Admin { /// # use nitrokey::Error; /// /// # fn try_main() -> Result<(), Error> { - /// let device = nitrokey::connect()?; + /// let mut device = nitrokey::connect()?; /// let config = Config::new(None, None, None, false); /// match device.authenticate_admin("12345678") { - /// Ok(mut admin) => { - /// admin.write_config(config); - /// () - /// }, - /// Err((_, err)) => eprintln!("Could not authenticate as admin: {}", err), + /// Ok(mut admin) => admin.write_config(config)?, + /// Err(err) => eprintln!("Could not authenticate as admin: {}", err), /// }; /// # Ok(()) /// # } @@ -316,7 +247,7 @@ impl Admin { } } -impl ConfigureOtp for Admin { +impl<'a, T: Device> ConfigureOtp for Admin<'a, T> { fn write_hotp_slot(&mut self, data: OtpSlotData, counter: u64) -> Result<(), Error> { let raw_data = RawOtpSlotData::new(data)?; get_command_result(unsafe { @@ -364,8 +295,8 @@ impl ConfigureOtp for Admin { } } -impl AuthenticatedDevice for Admin { - fn new(device: T, temp_password: Vec) -> Self { +impl<'a, T: Device> AuthenticatedDevice<'a, T> for Admin<'a, T> { + fn new(device: &'a mut T, temp_password: Vec) -> Self { Admin { device, temp_password, @@ -378,35 +309,27 @@ impl AuthenticatedDevice for Admin { } impl Authenticate for DeviceWrapper { - fn authenticate_user(self, password: &str) -> Result, (Self, Error)> { - match self { - DeviceWrapper::Storage(storage) => { - authenticate_user_wrapper(storage, DeviceWrapper::Storage, password) - } - DeviceWrapper::Pro(pro) => authenticate_user_wrapper(pro, DeviceWrapper::Pro, password), - } + fn authenticate_user(&mut self, password: &str) -> Result, Error> { + authenticate(self, password, |password_ptr, temp_password_ptr| unsafe { + nitrokey_sys::NK_user_authenticate(password_ptr, temp_password_ptr) + }) } - fn authenticate_admin(self, password: &str) -> Result, (Self, Error)> { - match self { - DeviceWrapper::Storage(storage) => { - authenticate_admin_wrapper(storage, DeviceWrapper::Storage, password) - } - DeviceWrapper::Pro(pro) => { - authenticate_admin_wrapper(pro, DeviceWrapper::Pro, password) - } - } + fn authenticate_admin(&mut self, password: &str) -> Result, Error> { + authenticate(self, password, |password_ptr, temp_password_ptr| unsafe { + nitrokey_sys::NK_user_authenticate(password_ptr, temp_password_ptr) + }) } } impl Authenticate for Pro { - fn authenticate_user(self, password: &str) -> Result, (Self, Error)> { + fn authenticate_user(&mut self, password: &str) -> Result, Error> { authenticate(self, password, |password_ptr, temp_password_ptr| unsafe { nitrokey_sys::NK_user_authenticate(password_ptr, temp_password_ptr) }) } - fn authenticate_admin(self, password: &str) -> Result, (Self, Error)> { + fn authenticate_admin(&mut self, password: &str) -> Result, Error> { authenticate(self, password, |password_ptr, temp_password_ptr| unsafe { nitrokey_sys::NK_first_authenticate(password_ptr, temp_password_ptr) }) @@ -414,13 +337,13 @@ impl Authenticate for Pro { } impl Authenticate for Storage { - fn authenticate_user(self, password: &str) -> Result, (Self, Error)> { + fn authenticate_user(&mut self, password: &str) -> Result, Error> { authenticate(self, password, |password_ptr, temp_password_ptr| unsafe { nitrokey_sys::NK_user_authenticate(password_ptr, temp_password_ptr) }) } - fn authenticate_admin(self, password: &str) -> Result, (Self, Error)> { + fn authenticate_admin(&mut self, password: &str) -> Result, Error> { authenticate(self, password, |password_ptr, temp_password_ptr| unsafe { nitrokey_sys::NK_first_authenticate(password_ptr, temp_password_ptr) }) diff --git a/src/device.rs b/src/device.rs index f6492cd..a0df30e 100644 --- a/src/device.rs +++ b/src/device.rs @@ -71,16 +71,10 @@ impl fmt::Display for VolumeMode { /// fn perform_other_task(device: &DeviceWrapper) {} /// /// # fn try_main() -> Result<(), Error> { -/// let device = nitrokey::connect()?; -/// let device = match device.authenticate_user("123456") { -/// Ok(user) => { -/// perform_user_task(&user); -/// user.device() -/// }, -/// Err((device, err)) => { -/// eprintln!("Could not authenticate as user: {}", err); -/// device -/// }, +/// let mut device = nitrokey::connect()?; +/// match device.authenticate_user("123456") { +/// Ok(user) => perform_user_task(&user), +/// Err(err) => eprintln!("Could not authenticate as user: {}", err), /// }; /// perform_other_task(&device); /// # Ok(()) @@ -135,16 +129,10 @@ pub enum DeviceWrapper { /// fn perform_other_task(device: &Pro) {} /// /// # fn try_main() -> Result<(), Error> { -/// let device = nitrokey::Pro::connect()?; -/// let device = match device.authenticate_user("123456") { -/// Ok(user) => { -/// perform_user_task(&user); -/// user.device() -/// }, -/// Err((device, err)) => { -/// eprintln!("Could not authenticate as user: {}", err); -/// device -/// }, +/// let mut device = nitrokey::Pro::connect()?; +/// match device.authenticate_user("123456") { +/// Ok(user) => perform_user_task(&user), +/// Err(err) => eprintln!("Could not authenticate as user: {}", err), /// }; /// perform_other_task(&device); /// # Ok(()) @@ -181,16 +169,10 @@ pub struct Pro { /// fn perform_other_task(device: &Storage) {} /// /// # fn try_main() -> Result<(), Error> { -/// let device = nitrokey::Storage::connect()?; -/// let device = match device.authenticate_user("123456") { -/// Ok(user) => { -/// perform_user_task(&user); -/// user.device() -/// }, -/// Err((device, err)) => { -/// eprintln!("Could not authenticate as user: {}", err); -/// device -/// }, +/// let mut device = nitrokey::Storage::connect()?; +/// match device.authenticate_user("123456") { +/// Ok(user) => perform_user_task(&user), +/// Err(err) => eprintln!("Could not authenticate as user: {}", err), /// }; /// perform_other_task(&device); /// # Ok(()) diff --git a/src/lib.rs b/src/lib.rs index c35829c..d7a8c5e 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -44,7 +44,7 @@ //! # use nitrokey::Error; //! //! # fn try_main() -> Result<(), Error> { -//! let device = nitrokey::connect()?; +//! let mut device = nitrokey::connect()?; //! let slot_data = OtpSlotData::new(1, "test", "01234567890123456689", OtpMode::SixDigits); //! match device.authenticate_admin("12345678") { //! Ok(mut admin) => { @@ -53,7 +53,7 @@ //! Err(err) => eprintln!("Could not write slot: {}", err), //! } //! }, -//! Err((_, err)) => eprintln!("Could not authenticate as admin: {}", err), +//! Err(err) => eprintln!("Could not authenticate as admin: {}", err), //! } //! # Ok(()) //! # } diff --git a/src/otp.rs b/src/otp.rs index ee142c7..a8dd20b 100644 --- a/src/otp.rs +++ b/src/otp.rs @@ -35,7 +35,7 @@ pub trait ConfigureOtp { /// # use nitrokey::Error; /// /// # fn try_main() -> Result<(), Error> { - /// let device = nitrokey::connect()?; + /// let mut device = nitrokey::connect()?; /// let slot_data = OtpSlotData::new(1, "test", "01234567890123456689", OtpMode::SixDigits); /// match device.authenticate_admin("12345678") { /// Ok(mut admin) => { @@ -44,7 +44,7 @@ pub trait ConfigureOtp { /// Err(err) => eprintln!("Could not write slot: {}", err), /// } /// }, - /// Err((_, err)) => eprintln!("Could not authenticate as admin: {}", err), + /// Err(err) => eprintln!("Could not authenticate as admin: {}", err), /// } /// # Ok(()) /// # } @@ -71,7 +71,7 @@ pub trait ConfigureOtp { /// # use nitrokey::Error; /// /// # fn try_main() -> Result<(), Error> { - /// let device = nitrokey::connect()?; + /// let mut device = nitrokey::connect()?; /// let slot_data = OtpSlotData::new(1, "test", "01234567890123456689", OtpMode::EightDigits); /// match device.authenticate_admin("12345678") { /// Ok(mut admin) => { @@ -80,7 +80,7 @@ pub trait ConfigureOtp { /// Err(err) => eprintln!("Could not write slot: {}", err), /// } /// }, - /// Err((_, err)) => eprintln!("Could not authenticate as admin: {}", err), + /// Err(err) => eprintln!("Could not authenticate as admin: {}", err), /// } /// # Ok(()) /// # } @@ -104,7 +104,7 @@ pub trait ConfigureOtp { /// # use nitrokey::Error; /// /// # fn try_main() -> Result<(), Error> { - /// let device = nitrokey::connect()?; + /// let mut device = nitrokey::connect()?; /// match device.authenticate_admin("12345678") { /// Ok(mut admin) => { /// match admin.erase_hotp_slot(1) { @@ -112,7 +112,7 @@ pub trait ConfigureOtp { /// Err(err) => eprintln!("Could not erase slot: {}", err), /// } /// }, - /// Err((_, err)) => eprintln!("Could not authenticate as admin: {}", err), + /// Err(err) => eprintln!("Could not authenticate as admin: {}", err), /// } /// # Ok(()) /// # } @@ -134,7 +134,7 @@ pub trait ConfigureOtp { /// # use nitrokey::Error; /// /// # fn try_main() -> Result<(), Error> { - /// let device = nitrokey::connect()?; + /// let mut device = nitrokey::connect()?; /// match device.authenticate_admin("12345678") { /// Ok(mut admin) => { /// match admin.erase_totp_slot(1) { @@ -142,7 +142,7 @@ pub trait ConfigureOtp { /// Err(err) => eprintln!("Could not erase slot: {}", err), /// } /// }, - /// Err((_, err)) => eprintln!("Could not authenticate as admin: {}", err), + /// Err(err) => eprintln!("Could not authenticate as admin: {}", err), /// } /// # Ok(()) /// # } -- cgit v1.2.1