aboutsummaryrefslogtreecommitdiff
path: root/nitrocli/src/main.rs
blob: f3f7d7f7833550f45dc191bdaf8de9cbba30fb9c (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
// main.rs

// *************************************************************************
// * Copyright (C) 2017 Daniel Mueller (deso@posteo.net)                   *
// *                                                                       *
// * This program is free software: you can redistribute it and/or modify  *
// * it under the terms of the GNU General Public License as published by  *
// * the Free Software Foundation, either version 3 of the License, or     *
// * (at your option) any later version.                                   *
// *                                                                       *
// * This program is distributed in the hope that it will be useful,       *
// * but WITHOUT ANY WARRANTY; without even the implied warranty of        *
// * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
// * GNU General Public License for more details.                          *
// *                                                                       *
// * You should have received a copy of the GNU General Public License     *
// * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
// *************************************************************************


#![deny(missing_docs)]

//! Nitrocli is a program providing a command line interface to certain
//! commands of the Nitrokey Storage device.

extern crate hid as libhid;


mod crc32;
mod error;
mod nitrokey;
mod pinentry;

use error::Error;
use std::mem;
use std::process;
use std::result;
use std::thread;
use std::time;

type Result<T> = result::Result<T, Error>;
type NitroFunc = Fn(&mut libhid::Handle) -> Result<()>;


const SEND_TRY_COUNT: i8 = 3;
const RECV_TRY_COUNT: i8 = 40;
const SEND_RECV_DELAY_MS: u64 = 200;


/// Send a HID feature report to the device represented by the given handle.
fn send<P>(handle: &mut libhid::Handle, report: &nitrokey::Report<P>) -> Result<()>
  where P: AsRef<[u8]>,
{
  let mut retry = SEND_TRY_COUNT;
  loop {
    let result = handle.feature().send_to(0, report.as_ref());
    retry -= 1;

    match result {
      Ok(_) => {
        return Ok(());
      },
      Err(err) => {
        if retry > 0 {
          thread::sleep(time::Duration::from_millis(SEND_RECV_DELAY_MS));
          continue;
        } else {
          return Err(Error::HidError(err));
        }
      },
    }
  }
}


/// Receive a HID feature report from the device represented by the given handle.
fn receive<P>(handle: &mut libhid::Handle) -> Result<nitrokey::Report<P>>
  where P: AsRef<[u8]> + Default,
{
  let mut retry = RECV_TRY_COUNT;
  loop {
    let mut report = nitrokey::Report::<P>::new();
    let result = handle.feature().get_from(0, report.as_mut());

    retry -= 1;

    match result {
      Ok(size) => {
        if size < mem::size_of_val(&report) {
          if retry > 0 {
            continue;
          } else {
            return Err(Error::Error("Failed to receive complete report".to_string()));
          }
        }

        if !report.is_valid() {
          if retry > 0 {
            continue;
          } else {
            return Err(Error::Error("Failed to receive report: CRC mismatch".to_string()));
          }
        }
        return Ok(report);
      },

      Err(err) => {
        if retry > 0 {
          thread::sleep(time::Duration::from_millis(SEND_RECV_DELAY_MS));
          continue;
        } else {
          return Err(Error::HidError(err));
        }
      },
    }
  }
}


/// Transmit a HID feature report to the nitrokey and receive a response.
fn transmit<PS, PR>(handle: &mut libhid::Handle,
                    report: &nitrokey::Report<PS>)
                    -> Result<nitrokey::Report<PR>>
  where PS: AsRef<[u8]>,
        PR: AsRef<[u8]> + Default,
{
  send(handle, &report)?;

  // We need to give the stick some time to handle the command. If we
  // don't, we might just receive stale data from before.
  thread::sleep(time::Duration::from_millis(SEND_RECV_DELAY_MS));

  return receive::<PR>(handle);
}


/// Find and open the nitrokey device and execute a function on it.
fn nitrokey_do(function: &NitroFunc) -> Result<()> {
  let hid = libhid::init()?;
  // The Manager::find method is plain stupid as it still returns an
  // iterable. Using it does not help in more concise error handling.
  for device in hid.devices() {
    if device.vendor_id() == nitrokey::VID && device.product_id() == nitrokey::PID {
      return function(&mut device.open()?);
    }
  }
  return Err(Error::Error("Nitrokey device not found".to_string()));
}


/// Pretty print the response of a status command.
fn print_status(response: &nitrokey::DeviceStatusResponse) {
  println!("Status:");
  // We omit displaying information about the smartcard here as this
  // program really is only about the SD card portion of the device.
  println!("  SD card ID:        {:#x}", response.active_sdcard_id);
  println!("  firmware version:  {}.{}",
           response.version_major,
           response.version_minor);
  println!("  firmware:          {}",
           if response.firmware_locked != 0 {
             "locked".to_string()
           } else {
             "unlocked".to_string()
           });
  println!("  storage keys:      {}",
           if response.storage_keys_missing == 0 {
             "created".to_string()
           } else {
             "not created".to_string()
           });
  println!("  user retry count:  {}",
           response.user_password_retry_count);
  println!("  admin retry count: {}",
           response.admin_password_retry_count);
  println!("  volumes:");
  println!("    unencrypted:     {}",
           if response.volume_active & nitrokey::VOLUME_ACTIVE_UNENCRYPTED == 0 {
             "inactive"
           } else if response.unencrypted_volume_read_only != 0 {
             "read-only"
           } else {
             "active"
           });
  println!("    encrypted:       {}",
           if response.volume_active & nitrokey::VOLUME_ACTIVE_ENCRYPTED == 0 {
             "inactive"
           } else if response.encrypted_volume_read_only != 0 {
             "read-only"
           } else {
             "active"
           });
  println!("    hidden:          {}",
           if response.volume_active & nitrokey::VOLUME_ACTIVE_HIDDEN == 0 {
             "inactive"
           } else if response.hidden_volume_read_only != 0 {
             "read-only"
           } else {
             "active"
           });
}


/// Inquire the status of the nitrokey.
fn status() -> Result<()> {
  type Response = nitrokey::Response<nitrokey::DeviceStatusResponse>;

  return nitrokey_do(&|handle| {
    let payload = nitrokey::DeviceStatusCommand::new();
    let report = nitrokey::Report::from(payload);

    let report = transmit::<_, nitrokey::EmptyPayload>(handle, &report)?;
    let response = &AsRef::<Response>::as_ref(&report.data).data;

    // TODO: We should probably check the success of the command as
    //       well.
    if response.magic != nitrokey::MAGIC_NUMBER_STICK20_CONFIG {
      let error = format!("Status response contains invalid magic: {:#x} \
                           (expected: {:#x})",
                          response.magic,
                          nitrokey::MAGIC_NUMBER_STICK20_CONFIG);
      return Err(Error::Error(error.to_string()));
    }

    print_status(response);
    return Ok(());
  });
}


/// Poll the nitrokey until it reports to no longer be busy.
fn wait(handle: &mut libhid::Handle) -> Result<nitrokey::StorageStatus> {
  type Response = nitrokey::Response<nitrokey::StorageResponse>;

  loop {
    thread::sleep(time::Duration::from_millis(SEND_RECV_DELAY_MS));

    let report = receive::<nitrokey::EmptyPayload>(handle)?;
    let response = AsRef::<Response>::as_ref(&report.data);
    let status = response.data.storage_status;

    if status != nitrokey::StorageStatus::Busy &&
       status != nitrokey::StorageStatus::BusyProgressbar {
      return Ok(status);
    }
  }
}


/// Open the encrypted volume on the nitrokey.
fn open() -> Result<()> {
  type Response = nitrokey::Response<nitrokey::StorageResponse>;

  return nitrokey_do(&|handle| {
    let mut retry = 3;
    loop {
      let passphrase = pinentry::inquire_passphrase()?;
      let payload = nitrokey::EnableEncryptedVolumeCommand::new(&passphrase);
      let report = nitrokey::Report::from(payload);

      let report = transmit::<_, nitrokey::EmptyPayload>(handle, &report)?;
      let response = AsRef::<Response>::as_ref(&report.data);
      let mut status = response.data.storage_status;

      if status == nitrokey::StorageStatus::WrongPassword {
        pinentry::clear_passphrase()?;
        retry -= 1;

        if retry > 0 {
          println!("Wrong password, please reenter");
          continue;
        }
        let error = "Opening encrypted volume failed: Wrong password";
        return Err(Error::Error(error.to_string()));
      }
      if status == nitrokey::StorageStatus::Busy ||
         status == nitrokey::StorageStatus::BusyProgressbar {
        status = wait(handle)?;
      }
      if status != nitrokey::StorageStatus::Okay && status != nitrokey::StorageStatus::Idle {
        let status = format!("{:?}", status);
        let error = format!("Opening encrypted volume failed: {}", status);
        return Err(Error::Error(error));
      }
      return Ok(());
    }
  });
}


/// Close the previously opened encrypted volume.
fn close() -> Result<()> {
  type Response = nitrokey::Response<nitrokey::StorageResponse>;

  return nitrokey_do(&|handle| {
    let payload = nitrokey::DisableEncryptedVolumeCommand::new();
    let report = nitrokey::Report::from(payload);

    let report = transmit::<_, nitrokey::EmptyPayload>(handle, &report)?;
    let response = AsRef::<Response>::as_ref(&report.data);
    let mut status = response.data.storage_status;

    if status == nitrokey::StorageStatus::Busy ||
       status == nitrokey::StorageStatus::BusyProgressbar {
      status = wait(handle)?;
    }
    if status != nitrokey::StorageStatus::Okay && status != nitrokey::StorageStatus::Idle {
      let status = format!("{:?}", status);
      let error = format!("Closing encrypted volume failed: {}", status);
      return Err(Error::Error(error));
    }
    return Ok(());
  });
}


/// Clear the PIN stored when opening the nitrokey's encrypted volume.
fn clear() -> Result<()> {
  return pinentry::clear_passphrase();
}


// A macro for generating a match of the different supported commands.
// Each supplied command is converted into a string and matched against.
macro_rules! commands {
  ( $str:expr, [ $( $command:expr), *] ) => {
    match &*$str.to_string() {
      $(
        stringify!($command) => {
          if let Err(err) = $command() {
            println!("{}", err);
            return 1
          }
          return 0
        },
      )*
      x => {
        println!("Invalid command: {}", x);
        println!("Available commands: {}", stringify!( $($command)* ));
        return 1
      },
    }
  }
}

fn run() -> i32 {
  let argv: Vec<String> = std::env::args().collect();
  if argv.len() != 2 {
    println!("Usage: {} <command>", argv[0]);
    return 1;
  }

  commands!(&argv[1], [status, open, close, clear]);
}

fn main() {
  process::exit(run());
}


#[cfg(test)]
mod tests {
  use super::*;

  #[test]
  fn wrong_crc() {
    type Response = nitrokey::Response<nitrokey::DeviceStatusResponse>;

    nitrokey_do(&|handle| {
      let payload = nitrokey::DeviceStatusCommand::new();
      let mut report = nitrokey::Report::from(payload);

      // We want to verify that we get the correct result (i.e., a
      // report of the CRC mismatch) repeatedly.
      for _ in 0..10 {
        report.crc += 1;

        let new_report = transmit::<_, nitrokey::EmptyPayload>(handle, &report)?;
        let response = AsRef::<Response>::as_ref(&new_report.data);

        assert_eq!(response.command, nitrokey::Command::GetDeviceStatus);
        assert_eq!(response.command_crc, report.crc);
        assert_eq!(response.command_status, nitrokey::CommandStatus::WrongCrc);
      }
      return Ok(());
    })
      .unwrap();
  }

  #[test]
  fn device_status() {
    type Response = nitrokey::Response<nitrokey::DeviceStatusResponse>;

    nitrokey_do(&|handle| {
      let payload = nitrokey::DeviceStatusCommand::new();
      let report = nitrokey::Report::from(payload);

      let report = transmit::<_, nitrokey::EmptyPayload>(handle, &report)?;
      let response = AsRef::<Response>::as_ref(&report.data);

      assert!(response.device_status == nitrokey::StorageStatus::Idle ||
              response.device_status == nitrokey::StorageStatus::Okay);
      assert_eq!(response.data.magic, nitrokey::MAGIC_NUMBER_STICK20_CONFIG);
      return Ok(());
    })
      .unwrap();
  }
}