aboutsummaryrefslogtreecommitdiff
path: root/src/pws.rs
blob: fc4b51641bd36186675a3e273a212a08bc8bf471 (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
use device::{Device, DeviceWrapper, Pro, Storage};
use libc;
use nitrokey_sys;
use std::ffi::CString;
use util::{get_last_error, result_from_string, CommandError, CommandStatus};

/// 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.
///
/// The password safe struct wraps a device.  To get back to the original device, use the
/// [`device`][] method.  To retrieve a password safe from a Nitrokey device, use the
/// [`get_password_safe`][] method from the [`GetPasswordSafe`][] trait.
///
/// # Examples
///
/// Open a password safe and access a password:
///
/// ```no_run
/// use nitrokey::{Device, GetPasswordSafe};
/// # use nitrokey::CommandError;
///
/// fn use_device<T: Device>(device: &T) {}
///
/// # fn try_main() -> Result<(), CommandError> {
/// let device = nitrokey::connect()?;
/// let device = 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);
///         pws.device()
///     },
///     Err((device, err)) => {
///         println!("Could not open the password safe: {:?}", err);
///         device
///     },
/// };
/// use_device(&device);
/// #     Ok(())
/// # }
/// ```
///
/// [`SLOT_COUNT`]: constant.SLOT_COUNT.html
/// [`device`]: #method.device
/// [`get_password_safe`]: trait.GetPasswordSafe.html#method.get_password_safe
/// [`GetPasswordSafe`]: trait.GetPasswordSafe.html
pub struct PasswordSafe<T: Device> {
    device: T,
}

/// Provides access to a [`PasswordSafe`][].
///
/// When retrieving a password safe, the underlying device is consumed.  On success, the returned
/// password safe also containes the device.  On error, the device is returned as part of the
/// error.
///
/// [`PasswordSafe`]: struct.PasswordSafe.html
pub trait GetPasswordSafe {
    /// Enables and returns the password safe.  This method consumes the device.  You can go back
    /// to the device using the [`device`][] method of the returned password safe.  If the method
    /// fails, the current device will be returned as part of the error.
    ///
    /// # 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<T: Device>(pws: &PasswordSafe<T>) {}
    /// fn use_device<T: Device>(device: &T) {}
    ///
    /// # fn try_main() -> Result<(), CommandError> {
    /// let device = nitrokey::connect()?;
    /// let device = match device.get_password_safe("123456") {
    ///     Ok(pws) => {
    ///         use_password_safe(&pws);
    ///         pws.device()
    ///     },
    ///     Err((device, err)) => {
    ///         println!("Could not open the password safe: {:?}", err);
    ///         device
    ///     },
    /// };
    /// use_device(&device);
    /// #     Ok(())
    /// # }
    /// ```
    ///
    /// [`device`]: struct.PasswordSafe.html#method.device
    /// [`InvalidString`]: enum.CommandError.html#variant.InvalidString
    /// [`WrongPassword`]: enum.CommandError.html#variant.WrongPassword
    fn get_password_safe(self, user_pin: &str) -> Result<PasswordSafe<Self>, (Self, CommandError)>
    where
        Self: Device + Sized;
}

fn get_password_safe<T: Device>(
    device: T,
    user_pin: &str,
) -> Result<PasswordSafe<T>, (T, CommandError)> {
    let user_pin_string = CString::new(user_pin);
    if user_pin_string.is_err() {
        return Err((device, CommandError::InvalidString));
    }
    let user_pin_string = user_pin_string.unwrap();
    let status = unsafe {
        CommandStatus::from(nitrokey_sys::NK_enable_password_safe(
            user_pin_string.as_ptr(),
        ))
    };
    match status {
        CommandStatus::Success => Ok(PasswordSafe { device }),
        CommandStatus::Error(err) => Err((device, err)),
    }
}

fn get_password_safe_wrapper<T, C>(
    device: T,
    constructor: C,
    user_pin: &str,
) -> Result<PasswordSafe<DeviceWrapper>, (DeviceWrapper, CommandError)>
where
    T: Device,
    C: Fn(T) -> DeviceWrapper,
{
    let result = device.get_password_safe(user_pin);
    match result {
        Ok(pws) => Ok(PasswordSafe {
            device: constructor(pws.device),
        }),
        Err((device, err)) => Err((constructor(device), err)),
    }
}

impl<T: Device> PasswordSafe<T> {
    /// Forgets the password safe access and returns an unauthenticated device.  This method
    /// consumes the password safe.  It does not perform any actual commands on the Nitrokey.
    pub fn device(self) -> T {
        self.device
    }

    /// 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()?;
    /// match device.get_password_safe("123456") {
    ///     Ok(pws) => {
    ///         pws.get_slot_status()?.iter().enumerate().for_each(|(slot, programmed)| {
    ///             let status = match *programmed {
    ///                 true => "programmed",
    ///                 false => "not programmed",
    ///             };
    ///             println!("Slot {}: {}", slot, status);
    ///         });
    ///     },
    ///     Err((_, err)) => println!("Could not open the password safe: {:?}", err),
    /// };
    /// #     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()?;
    /// 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_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()?;
    /// 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_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::{CommandStatus, GetPasswordSafe};
    /// # use nitrokey::CommandError;
    ///
    /// # fn try_main() -> Result<(), CommandError> {
    /// let device = nitrokey::connect()?;
    /// match device.get_password_safe("123456") {
    ///     Ok(pws) => match pws.write_slot(0, "GitHub", "johndoe", "passw0rd") {
    ///         CommandStatus::Success => println!("Successfully wrote slot 0."),
    ///         CommandStatus::Error(err) => println!("Could not write slot 0: {:?}", err),
    ///     },
    ///     Err((_, err)) => println!("Could not open the password safe: {:?}", err),
    /// };
    /// #     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) -> CommandStatus {
        let name_string = CString::new(name);
        let login_string = CString::new(login);
        let password_string = CString::new(password);
        if name_string.is_err() || login_string.is_err() || password_string.is_err() {
            return CommandStatus::Error(CommandError::InvalidString);
        }

        let name_string = name_string.unwrap();
        let login_string = login_string.unwrap();
        let password_string = password_string.unwrap();
        unsafe {
            CommandStatus::from(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::{CommandStatus, GetPasswordSafe};
    /// # use nitrokey::CommandError;
    ///
    /// # fn try_main() -> Result<(), CommandError> {
    /// let device = nitrokey::connect()?;
    /// match device.get_password_safe("123456") {
    ///     Ok(pws) => match pws.erase_slot(0) {
    ///         CommandStatus::Success => println!("Successfully erased slot 0."),
    ///         CommandStatus::Error(err) => println!("Could not erase slot 0: {:?}", err),
    ///     },
    ///     Err((_, err)) => println!("Could not open the password safe: {:?}", err),
    /// };
    /// #     Ok(())
    /// # }
    /// ```
    ///
    /// [`InvalidSlot`]: enum.CommandError.html#variant.InvalidSlot
    pub fn erase_slot(&self, slot: u8) -> CommandStatus {
        unsafe { CommandStatus::from(nitrokey_sys::NK_erase_password_safe_slot(slot)) }
    }
}

impl GetPasswordSafe for Pro {
    fn get_password_safe(self, user_pin: &str) -> Result<PasswordSafe<Self>, (Self, CommandError)> {
        get_password_safe(self, user_pin)
    }
}

impl GetPasswordSafe for Storage {
    fn get_password_safe(self, user_pin: &str) -> Result<PasswordSafe<Self>, (Self, CommandError)> {
        get_password_safe(self, user_pin)
    }
}

impl GetPasswordSafe for DeviceWrapper {
    fn get_password_safe(self, user_pin: &str) -> Result<PasswordSafe<Self>, (Self, CommandError)> {
        match self {
            DeviceWrapper::Storage(storage) => {
                get_password_safe_wrapper(storage, DeviceWrapper::Storage, user_pin)
            }
            DeviceWrapper::Pro(pro) => get_password_safe_wrapper(pro, DeviceWrapper::Pro, user_pin),
        }
    }
}