aboutsummaryrefslogtreecommitdiff
path: root/src/otp.rs
blob: 5dfe8b1de29b05339a4b0f01421fc7c932675757 (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
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 device = nitrokey::connect()?;
    /// let slot_data = OtpSlotData::new(1, "test", "01234567890123456689", OtpMode::SixDigits);
    /// match device.authenticate_admin("12345678") {
    ///     Ok(admin) => {
    ///         match admin.write_hotp_slot(slot_data, 0) {
    ///             Ok(()) => println!("Successfully wrote slot."),
    ///             Err(err) => println!("Could not write slot: {}", err),
    ///         }
    ///     },
    ///     Err((_, err)) => println!("Could not authenticate as admin: {}", err),
    /// }
    /// #     Ok(())
    /// # }
    /// ```
    ///
    /// [`InvalidSlot`]: enum.CommandError.html#variant.InvalidSlot
    /// [`InvalidString`]: enum.CommandError.html#variant.InvalidString
    /// [`NoName`]: enum.CommandError.html#variant.NoName
    fn write_hotp_slot(&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 device = nitrokey::connect()?;
    /// let slot_data = OtpSlotData::new(1, "test", "01234567890123456689", OtpMode::EightDigits);
    /// match device.authenticate_admin("12345678") {
    ///     Ok(admin) => {
    ///         match admin.write_totp_slot(slot_data, 30) {
    ///             Ok(()) => println!("Successfully wrote slot."),
    ///             Err(err) => println!("Could not write slot: {}", err),
    ///         }
    ///     },
    ///     Err((_, err)) => println!("Could not authenticate as admin: {}", err),
    /// }
    /// #     Ok(())
    /// # }
    /// ```
    ///
    /// [`InvalidSlot`]: enum.CommandError.html#variant.InvalidSlot
    /// [`InvalidString`]: enum.CommandError.html#variant.InvalidString
    /// [`NoName`]: enum.CommandError.html#variant.NoName
    fn write_totp_slot(&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 device = nitrokey::connect()?;
    /// match device.authenticate_admin("12345678") {
    ///     Ok(admin) => {
    ///         match admin.erase_hotp_slot(1) {
    ///             Ok(()) => println!("Successfully erased slot."),
    ///             Err(err) => println!("Could not erase slot: {}", err),
    ///         }
    ///     },
    ///     Err((_, err)) => println!("Could not authenticate as admin: {}", err),
    /// }
    /// #     Ok(())
    /// # }
    /// ```
    ///
    /// [`InvalidSlot`]: enum.CommandError.html#variant.InvalidSlot
    fn erase_hotp_slot(&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 device = nitrokey::connect()?;
    /// match device.authenticate_admin("12345678") {
    ///     Ok(admin) => {
    ///         match admin.erase_totp_slot(1) {
    ///             Ok(()) => println!("Successfully erased slot."),
    ///             Err(err) => println!("Could not erase slot: {}", err),
    ///         }
    ///     },
    ///     Err((_, err)) => println!("Could not authenticate as admin: {}", err),
    /// }
    /// #     Ok(())
    /// # }
    /// ```
    ///
    /// [`InvalidSlot`]: enum.CommandError.html#variant.InvalidSlot
    fn erase_totp_slot(&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 device = nitrokey::connect()?;
    /// let time = time::SystemTime::now().duration_since(time::UNIX_EPOCH);
    /// match time {
    ///     Ok(time) => device.set_time(time.as_secs(), false)?,
    ///     Err(_) => println!("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(&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 device = nitrokey::connect()?;
    /// match device.get_hotp_slot_name(1) {
    ///     Ok(name) => println!("HOTP slot 1: {}", name),
    ///     Err(Error::CommandError(CommandError::SlotNotProgrammed)) => println!("HOTP slot 1 not programmed"),
    ///     Err(err) => println!("Could not get slot name: {}", err),
    /// };
    /// #     Ok(())
    /// # }
    /// ```
    ///
    /// [`InvalidSlot`]: enum.CommandError.html#variant.InvalidSlot
    /// [`SlotNotProgrammed`]: enum.CommandError.html#variant.SlotNotProgrammed
    fn get_hotp_slot_name(&self, slot: u8) -> Result<String, Error> {
        unsafe { result_from_string(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 device = nitrokey::connect()?;
    /// match device.get_totp_slot_name(1) {
    ///     Ok(name) => println!("TOTP slot 1: {}", name),
    ///     Err(Error::CommandError(CommandError::SlotNotProgrammed)) => println!("TOTP slot 1 not programmed"),
    ///     Err(err) => println!("Could not get slot name: {}", err),
    /// };
    /// #     Ok(())
    /// # }
    /// ```
    ///
    /// [`InvalidSlot`]: enum.CommandError.html#variant.InvalidSlot
    /// [`SlotNotProgrammed`]: enum.CommandError.html#variant.SlotNotProgrammed
    fn get_totp_slot_name(&self, slot: u8) -> Result<String, Error> {
        unsafe { result_from_string(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 device = nitrokey::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.CommandError.html#variant.InvalidSlot
    /// [`NotAuthorized`]: enum.CommandError.html#variant.NotAuthorized
    /// [`SlotNotProgrammed`]: enum.CommandError.html#variant.SlotNotProgrammed
    fn get_hotp_code(&self, slot: u8) -> Result<String, Error> {
        unsafe {
            return result_from_string(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 device = nitrokey::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(_) => println!("Timestamps before 1970-01-01 are not supported!"),
    /// }
    /// #     Ok(())
    /// # }
    /// ```
    ///
    /// [`set_time`]: #method.set_time
    /// [`get_config`]: trait.Device.html#method.get_config
    /// [`InvalidSlot`]: enum.CommandError.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> {
        unsafe {
            return result_from_string(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,
        })
    }
}