aboutsummaryrefslogtreecommitdiff
path: root/src/device.rs
blob: 73952cce68dbb7038922a0a2cd38cd635dd72e2b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
use auth::Authenticate;
use config::{Config, RawConfig};
use libc;
use nitrokey_sys;
use otp::GenerateOtp;
use pws::GetPasswordSafe;
use std::ffi::CString;
use util::{get_last_error, result_from_string, CommandError, CommandStatus};

/// Available Nitrokey models.
#[derive(Debug, PartialEq)]
enum Model {
    /// The Nitrokey Storage.
    Storage,
    /// The Nitrokey Pro.
    Pro,
}

/// A wrapper for a Nitrokey device of unknown type.
///
/// Use the function [`connect`][] to obtain a wrapped instance.  The wrapper implements all traits
/// that are shared between all Nitrokey devices so that the shared functionality can be used
/// without knowing the type of the underlying device.  If you want to use functionality that is
/// not available for all devices, you have to extract the device.
///
/// # Examples
///
/// Authentication with error handling:
///
/// ```no_run
/// use nitrokey::{Authenticate, DeviceWrapper, User};
/// # use nitrokey::CommandError;
///
/// fn perform_user_task(device: &User<DeviceWrapper>) {}
/// fn perform_other_task(device: &DeviceWrapper) {}
///
/// # fn try_main() -> Result<(), CommandError> {
/// let device = nitrokey::connect()?;
/// let device = match device.authenticate_user("123456") {
///     Ok(user) => {
///         perform_user_task(&user);
///         user.device()
///     },
///     Err((device, err)) => {
///         println!("Could not authenticate as user: {:?}", err);
///         device
///     },
/// };
/// perform_other_task(&device);
/// #     Ok(())
/// # }
/// ```
///
/// [`connect`]: fn.connect.html
// TODO: add example for Storage-specific code
#[derive(Debug)]
pub enum DeviceWrapper {
    /// A Nitrokey Storage device.
    Storage(Storage),
    /// A Nitrokey Pro device.
    Pro(Pro),
}

/// A Nitrokey Pro device without user or admin authentication.
///
/// Use the global function [`connect`][] to obtain an instance wrapper or the method
/// [`connect`][`Pro::connect`] to directly obtain an instance.  If you want to execute a command
/// that requires user or admin authentication, use [`authenticate_admin`][] or
/// [`authenticate_user`][].
///
/// # Examples
///
/// Authentication with error handling:
///
/// ```no_run
/// use nitrokey::{Authenticate, User, Pro};
/// # use nitrokey::CommandError;
///
/// fn perform_user_task(device: &User<Pro>) {}
/// fn perform_other_task(device: &Pro) {}
///
/// # fn try_main() -> Result<(), CommandError> {
/// let device = nitrokey::Pro::connect()?;
/// let device = match device.authenticate_user("123456") {
///     Ok(user) => {
///         perform_user_task(&user);
///         user.device()
///     },
///     Err((device, err)) => {
///         println!("Could not authenticate as user: {:?}", err);
///         device
///     },
/// };
/// perform_other_task(&device);
/// #     Ok(())
/// # }
/// ```
///
/// [`authenticate_admin`]: trait.Authenticate.html#method.authenticate_admin
/// [`authenticate_user`]: trait.Authenticate.html#method.authenticate_user
/// [`connect`]: fn.connect.html
/// [`Pro::connect`]: #method.connect
#[derive(Debug)]
pub struct Pro {}

/// A Nitrokey Storage device without user or admin authentication.
///
/// Use the global function [`connect`][] to obtain an instance wrapper or the method
/// [`connect`][`Storage::connect`] to directly obtain an instance.  If you want to execute a
/// command that requires user or admin authentication, use [`authenticate_admin`][] or
/// [`authenticate_user`][].
///
/// # Examples
///
/// Authentication with error handling:
///
/// ```no_run
/// use nitrokey::{Authenticate, User, Storage};
/// # use nitrokey::CommandError;
///
/// fn perform_user_task(device: &User<Storage>) {}
/// fn perform_other_task(device: &Storage) {}
///
/// # fn try_main() -> Result<(), CommandError> {
/// let device = nitrokey::Storage::connect()?;
/// let device = match device.authenticate_user("123456") {
///     Ok(user) => {
///         perform_user_task(&user);
///         user.device()
///     },
///     Err((device, err)) => {
///         println!("Could not authenticate as user: {:?}", err);
///         device
///     },
/// };
/// perform_other_task(&device);
/// #     Ok(())
/// # }
/// ```
///
/// [`authenticate_admin`]: trait.Authenticate.html#method.authenticate_admin
/// [`authenticate_user`]: trait.Authenticate.html#method.authenticate_user
/// [`connect`]: fn.connect.html
/// [`Storage::connect`]: #method.connect
#[derive(Debug)]
pub struct Storage {}

/// A Nitrokey device.
///
/// This trait provides the commands that can be executed without authentication and that are
/// present on all supported Nitrokey devices.
pub trait Device: Authenticate + GetPasswordSafe + GenerateOtp {
    /// Returns the serial number of the Nitrokey device.  The serial number is the string
    /// representation of a hex number.
    ///
    /// # Example
    ///
    /// ```no_run
    /// use nitrokey::Device;
    /// # use nitrokey::CommandError;
    ///
    /// # fn try_main() -> Result<(), CommandError> {
    /// let device = nitrokey::connect()?;
    /// match device.get_serial_number() {
    ///     Ok(number) => println!("serial no: {:?}", number),
    ///     Err(err) => println!("Could not get serial number: {:?}", err),
    /// };
    /// #     Ok(())
    /// # }
    /// ```
    fn get_serial_number(&self) -> Result<String, CommandError> {
        unsafe { result_from_string(nitrokey_sys::NK_device_serial_number()) }
    }

    /// Returns the number of remaining authentication attempts for the user.  The total number of
    /// available attempts is three.
    ///
    /// # Example
    ///
    /// ```no_run
    /// use nitrokey::Device;
    /// # use nitrokey::CommandError;
    ///
    /// # fn try_main() -> Result<(), CommandError> {
    /// let device = nitrokey::connect()?;
    /// let count = device.get_user_retry_count();
    /// println!("{} remaining authentication attempts (user)", count);
    /// #     Ok(())
    /// # }
    /// ```
    fn get_user_retry_count(&self) -> u8 {
        unsafe { nitrokey_sys::NK_get_user_retry_count() }
    }

    /// Returns the number of remaining authentication attempts for the admin.  The total number of
    /// available attempts is three.
    ///
    /// # Example
    ///
    /// ```no_run
    /// use nitrokey::Device;
    /// # use nitrokey::CommandError;
    ///
    /// # fn try_main() -> Result<(), CommandError> {
    /// let device = nitrokey::connect()?;
    /// let count = device.get_admin_retry_count();
    /// println!("{} remaining authentication attempts (admin)", count);
    /// #     Ok(())
    /// # }
    /// ```
    fn get_admin_retry_count(&self) -> u8 {
        unsafe { nitrokey_sys::NK_get_admin_retry_count() }
    }

    /// Returns the major part of the firmware version (should be zero).
    ///
    /// # Example
    ///
    /// ```no_run
    /// use nitrokey::Device;
    /// # use nitrokey::CommandError;
    ///
    /// # fn try_main() -> Result<(), CommandError> {
    /// let device = nitrokey::connect()?;
    /// println!(
    ///     "Firmware version: {}.{}",
    ///     device.get_major_firmware_version(),
    ///     device.get_minor_firmware_version(),
    /// );
    /// #     Ok(())
    /// # }
    /// ```
    fn get_major_firmware_version(&self) -> i32 {
        unsafe { nitrokey_sys::NK_get_major_firmware_version() }
    }

    /// Returns the minor part of the firmware version (for example 8 for version 0.8).
    ///
    /// # Example
    ///
    /// ```no_run
    /// use nitrokey::Device;
    /// # use nitrokey::CommandError;
    ///
    /// # fn try_main() -> Result<(), CommandError> {
    /// let device = nitrokey::connect()?;
    /// println!(
    ///     "Firmware version: {}.{}",
    ///     device.get_major_firmware_version(),
    ///     device.get_minor_firmware_version(),
    /// );
    /// #     Ok(())
    /// # }
    fn get_minor_firmware_version(&self) -> i32 {
        unsafe { nitrokey_sys::NK_get_minor_firmware_version() }
    }

    /// Returns the current configuration of the Nitrokey device.
    ///
    /// # Example
    ///
    /// ```no_run
    /// use nitrokey::Device;
    /// # use nitrokey::CommandError;
    ///
    /// # fn try_main() -> Result<(), CommandError> {
    /// let device = nitrokey::connect()?;
    /// let config = device.get_config()?;
    /// println!("numlock binding:          {:?}", config.numlock);
    /// println!("capslock binding:         {:?}", config.capslock);
    /// println!("scrollock binding:        {:?}", config.scrollock);
    /// println!("require password for OTP: {:?}", config.user_password);
    /// #     Ok(())
    /// # }
    /// ```
    fn get_config(&self) -> Result<Config, CommandError> {
        unsafe {
            let config_ptr = nitrokey_sys::NK_read_config();
            if config_ptr.is_null() {
                return Err(get_last_error());
            }
            let config_array_ptr = config_ptr as *const [u8; 5];
            let raw_config = RawConfig::from(*config_array_ptr);
            libc::free(config_ptr as *mut libc::c_void);
            return Ok(raw_config.into());
        }
    }

    /// Changes the administrator PIN.
    ///
    /// # Errors
    ///
    /// - [`InvalidString`][] if one of the provided passwords contains a null byte
    /// - [`WrongPassword`][] if the current admin password is wrong
    ///
    /// # Example
    ///
    /// ```no_run
    /// use nitrokey::{CommandStatus, Device};
    /// # use nitrokey::CommandError;
    ///
    /// # fn try_main() -> Result<(), CommandError> {
    /// let device = nitrokey::connect()?;
    /// match device.change_admin_pin("12345678", "12345679") {
    ///     CommandStatus::Success => println!("Updated admin PIN."),
    ///     CommandStatus::Error(err) => println!("Failed to update admin PIN: {:?}", err),
    /// };
    /// #     Ok(())
    /// # }
    /// ```
    ///
    /// [`InvalidString`]: enum.CommandError.html#variant.InvalidString
    /// [`WrongPassword`]: enum.CommandError.html#variant.WrongPassword
    fn change_admin_pin(&self, current: &str, new: &str) -> CommandStatus {
        let current_string = CString::new(current);
        let new_string = CString::new(new);
        if current_string.is_err() || new_string.is_err() {
            return CommandStatus::Error(CommandError::InvalidString);
        }
        let current_string = current_string.unwrap();
        let new_string = new_string.unwrap();
        unsafe {
            CommandStatus::from(nitrokey_sys::NK_change_admin_PIN(
                current_string.as_ptr(),
                new_string.as_ptr(),
            ))
        }
    }

    /// Changes the user PIN.
    ///
    /// # 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::{CommandStatus, Device};
    /// # use nitrokey::CommandError;
    ///
    /// # fn try_main() -> Result<(), CommandError> {
    /// let device = nitrokey::connect()?;
    /// match device.change_user_pin("123456", "123457") {
    ///     CommandStatus::Success => println!("Updated admin PIN."),
    ///     CommandStatus::Error(err) => println!("Failed to update admin PIN: {:?}", err),
    /// };
    /// #     Ok(())
    /// # }
    /// ```
    ///
    /// [`InvalidString`]: enum.CommandError.html#variant.InvalidString
    /// [`WrongPassword`]: enum.CommandError.html#variant.WrongPassword
    fn change_user_pin(&self, current: &str, new: &str) -> CommandStatus {
        let current_string = CString::new(current);
        let new_string = CString::new(new);
        if current_string.is_err() || new_string.is_err() {
            return CommandStatus::Error(CommandError::InvalidString);
        }
        let current_string = current_string.unwrap();
        let new_string = new_string.unwrap();
        unsafe {
            CommandStatus::from(nitrokey_sys::NK_change_user_PIN(
                current_string.as_ptr(),
                new_string.as_ptr(),
            ))
        }
    }
}

/// Connects to a Nitrokey device.  This method can be used to connect to any connected device,
/// both a Nitrokey Pro and a Nitrokey Storage.
///
/// # Example
///
/// ```
/// use nitrokey::DeviceWrapper;
///
/// fn do_something(device: DeviceWrapper) {}
///
/// match nitrokey::connect() {
///     Ok(device) => do_something(device),
///     Err(err) => println!("Could not connect to a Nitrokey: {:?}", err),
/// }
/// ```
pub fn connect() -> Result<DeviceWrapper, CommandError> {
    unsafe {
        match nitrokey_sys::NK_login_auto() {
            1 => match get_connected_device() {
                Some(wrapper) => Ok(wrapper),
                None => Err(CommandError::Unknown),
            },
            _ => Err(CommandError::Unknown),
        }
    }
}

fn get_connected_device() -> Option<DeviceWrapper> {
    // TODO: check connected device
    Some(DeviceWrapper::Pro(Pro {}))
}

fn connect_model(model: Model) -> bool {
    let model = match model {
        Model::Storage => nitrokey_sys::NK_device_model_NK_STORAGE,
        Model::Pro => nitrokey_sys::NK_device_model_NK_PRO,
    };
    unsafe { nitrokey_sys::NK_login_enum(model) == 1 }
}

impl DeviceWrapper {
    fn device(&self) -> &Device {
        match *self {
            DeviceWrapper::Storage(ref storage) => storage,
            DeviceWrapper::Pro(ref pro) => pro,
        }
    }
}

impl GenerateOtp for DeviceWrapper {
    fn get_hotp_slot_name(&self, slot: u8) -> Result<String, CommandError> {
        self.device().get_hotp_slot_name(slot)
    }

    fn get_totp_slot_name(&self, slot: u8) -> Result<String, CommandError> {
        self.device().get_totp_slot_name(slot)
    }

    fn get_hotp_code(&self, slot: u8) -> Result<String, CommandError> {
        self.device().get_hotp_code(slot)
    }

    fn get_totp_code(&self, slot: u8) -> Result<String, CommandError> {
        self.device().get_totp_code(slot)
    }
}

impl Device for DeviceWrapper {}

impl Pro {
    pub fn connect() -> Result<Pro, CommandError> {
        // TODO: maybe Option instead of Result?
        match connect_model(Model::Pro) {
            true => Ok(Pro {}),
            false => Err(CommandError::Unknown),
        }
    }
}

impl Drop for Pro {
    fn drop(&mut self) {
        unsafe {
            nitrokey_sys::NK_logout();
        }
    }
}

impl Device for Pro {}

impl GenerateOtp for Pro {}

impl Storage {
    pub fn connect() -> Result<Storage, CommandError> {
        // TODO: maybe Option instead of Result?
        match connect_model(Model::Storage) {
            true => Ok(Storage {}),
            false => Err(CommandError::Unknown),
        }
    }
}

impl Drop for Storage {
    fn drop(&mut self) {
        unsafe {
            nitrokey_sys::NK_logout();
        }
    }
}

impl Device for Storage {}

impl GenerateOtp for Storage {}