aboutsummaryrefslogtreecommitdiff
path: root/src/error.rs
blob: 7bea3f235f7babe357489eb737d2a6e3099a2de7 (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
// Copyright (C) 2019 Robin Krahl <robin.krahl@ireas.org>
// SPDX-License-Identifier: MIT

use std::error;
use std::fmt;
use std::os::raw;
use std::str;
use std::sync;

use crate::device;

/// An error returned by the nitrokey crate.
#[derive(Debug)]
pub enum Error {
    /// An error reported by the Nitrokey device in the response packet.
    CommandError(CommandError),
    /// A device communication error.
    CommunicationError(CommunicationError),
    /// An error occurred due to concurrent access to the Nitrokey device.
    ConcurrentAccessError,
    /// A library usage error.
    LibraryError(LibraryError),
    /// An error that occurred due to a poisoned lock.
    PoisonError(sync::PoisonError<sync::MutexGuard<'static, crate::Manager>>),
    /// An error that occurred during random number generation.
    RandError(Box<dyn error::Error>),
    /// An error that is caused by an unexpected value returned by libnitrokey.
    UnexpectedError(String),
    /// An unknown error returned by libnitrokey.
    UnknownError(i64),
    /// An error caused by a Nitrokey model that is not supported by this crate.
    UnsupportedModelError,
    /// An error occurred when interpreting a UTF-8 string.
    Utf8Error(str::Utf8Error),
}

impl From<raw::c_int> for Error {
    fn from(code: raw::c_int) -> Self {
        if let Some(err) = CommandError::try_from(code) {
            Error::CommandError(err)
        } else if let Some(err) = CommunicationError::try_from(256 - code) {
            Error::CommunicationError(err)
        } else if let Some(err) = LibraryError::try_from(code) {
            Error::LibraryError(err)
        } else {
            Error::UnknownError(code.into())
        }
    }
}

impl From<CommandError> for Error {
    fn from(err: CommandError) -> Self {
        Error::CommandError(err)
    }
}

impl From<CommunicationError> for Error {
    fn from(err: CommunicationError) -> Self {
        Error::CommunicationError(err)
    }
}

impl From<LibraryError> for Error {
    fn from(err: LibraryError) -> Self {
        Error::LibraryError(err)
    }
}

impl From<str::Utf8Error> for Error {
    fn from(error: str::Utf8Error) -> Self {
        Error::Utf8Error(error)
    }
}

impl From<sync::PoisonError<sync::MutexGuard<'static, crate::Manager>>> for Error {
    fn from(error: sync::PoisonError<sync::MutexGuard<'static, crate::Manager>>) -> Self {
        Error::PoisonError(error)
    }
}

impl From<sync::TryLockError<sync::MutexGuard<'static, crate::Manager>>> for Error {
    fn from(error: sync::TryLockError<sync::MutexGuard<'static, crate::Manager>>) -> Self {
        match error {
            sync::TryLockError::Poisoned(err) => err.into(),
            sync::TryLockError::WouldBlock => Error::ConcurrentAccessError,
        }
    }
}

impl<'a, T: device::Device<'a>> From<(T, Error)> for Error {
    fn from((_, err): (T, Error)) -> Self {
        err
    }
}

impl error::Error for Error {
    fn source(&self) -> Option<&(dyn error::Error + 'static)> {
        match *self {
            Error::CommandError(ref err) => Some(err),
            Error::CommunicationError(ref err) => Some(err),
            Error::ConcurrentAccessError => None,
            Error::LibraryError(ref err) => Some(err),
            Error::PoisonError(ref err) => Some(err),
            Error::RandError(ref err) => Some(err.as_ref()),
            Error::UnexpectedError(_) => None,
            Error::UnknownError(_) => None,
            Error::UnsupportedModelError => None,
            Error::Utf8Error(ref err) => Some(err),
        }
    }
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match *self {
            Error::CommandError(ref err) => write!(f, "Command error: {}", err),
            Error::CommunicationError(ref err) => write!(f, "Communication error: {}", err),
            Error::ConcurrentAccessError => write!(f, "Internal error: concurrent access"),
            Error::LibraryError(ref err) => write!(f, "Library error: {}", err),
            Error::PoisonError(_) => write!(f, "Internal error: poisoned lock"),
            Error::RandError(ref err) => write!(f, "RNG error: {}", err),
            Error::UnexpectedError(ref s) => write!(f, "An unexpected error occurred: {}", s),
            Error::UnknownError(ref err) => write!(f, "Unknown error: {}", err),
            Error::UnsupportedModelError => write!(f, "Unsupported Nitrokey model"),
            Error::Utf8Error(ref err) => write!(f, "UTF-8 error: {}", err),
        }
    }
}

/// An error reported by the Nitrokey device in the response packet.
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum CommandError {
    /// A packet with a wrong checksum has been sent or received.
    WrongCrc,
    /// A command tried to access an OTP slot that does not exist.
    WrongSlot,
    /// A command tried to generate an OTP on a slot that is not configured.
    SlotNotProgrammed,
    /// The provided password is wrong.
    WrongPassword,
    /// You are not authorized for this command or provided a wrong temporary
    /// password.
    NotAuthorized,
    /// An error occurred when getting or setting the time.
    Timestamp,
    /// You did not provide a name for the OTP slot.
    NoName,
    /// This command is not supported by this device.
    NotSupported,
    /// This command is unknown.
    UnknownCommand,
    /// AES decryption failed.
    AesDecryptionFailed,
}

impl CommandError {
    fn try_from(value: raw::c_int) -> Option<Self> {
        match value {
            1 => Some(CommandError::WrongCrc),
            2 => Some(CommandError::WrongSlot),
            3 => Some(CommandError::SlotNotProgrammed),
            4 => Some(CommandError::WrongPassword),
            5 => Some(CommandError::NotAuthorized),
            6 => Some(CommandError::Timestamp),
            7 => Some(CommandError::NoName),
            8 => Some(CommandError::NotSupported),
            9 => Some(CommandError::UnknownCommand),
            10 => Some(CommandError::AesDecryptionFailed),
            _ => None,
        }
    }
}

impl error::Error for CommandError {}

impl fmt::Display for CommandError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str(match *self {
            CommandError::WrongCrc => "A packet with a wrong checksum has been sent or received",
            CommandError::WrongSlot => "The given slot does not exist",
            CommandError::SlotNotProgrammed => "The given slot is not programmed",
            CommandError::WrongPassword => "The given password is wrong",
            CommandError::NotAuthorized => {
                "You are not authorized for this command or provided a wrong temporary \
                 password"
            }
            CommandError::Timestamp => "An error occurred when getting or setting the time",
            CommandError::NoName => "You did not provide a name for the slot",
            CommandError::NotSupported => "This command is not supported by this device",
            CommandError::UnknownCommand => "This command is unknown",
            CommandError::AesDecryptionFailed => "AES decryption failed",
        })
    }
}

/// A device communication error.
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum CommunicationError {
    /// Could not connect to a Nitrokey device.
    NotConnected,
    /// Sending a packet failed.
    SendingFailure,
    /// Receiving a packet failed.
    ReceivingFailure,
    /// A packet with a wrong checksum was received.
    InvalidCrc,
}

impl CommunicationError {
    fn try_from(value: raw::c_int) -> Option<Self> {
        match value {
            2 => Some(CommunicationError::NotConnected),
            3 => Some(CommunicationError::SendingFailure),
            4 => Some(CommunicationError::ReceivingFailure),
            5 => Some(CommunicationError::InvalidCrc),
            _ => None,
        }
    }
}

impl error::Error for CommunicationError {}

impl fmt::Display for CommunicationError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str(match *self {
            CommunicationError::NotConnected => "Could not connect to a Nitrokey device",
            CommunicationError::SendingFailure => "Sending a packet failed",
            CommunicationError::ReceivingFailure => "Receiving a packet failed",
            CommunicationError::InvalidCrc => "A packet with a wrong checksum was received",
        })
    }
}

/// A library usage error.
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum LibraryError {
    /// A supplied string exceeded a length limit.
    StringTooLong,
    /// You passed an invalid slot.
    InvalidSlot,
    /// The supplied string was not in hexadecimal format.
    InvalidHexString,
    /// The target buffer was smaller than the source.
    TargetBufferTooSmall,
    /// You passed a string containing a null byte.
    InvalidString,
}

impl LibraryError {
    fn try_from(value: raw::c_int) -> Option<Self> {
        match value {
            200 => Some(LibraryError::StringTooLong),
            201 => Some(LibraryError::InvalidSlot),
            202 => Some(LibraryError::InvalidHexString),
            203 => Some(LibraryError::TargetBufferTooSmall),
            _ => None,
        }
    }
}

impl error::Error for LibraryError {}

impl fmt::Display for LibraryError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str(match *self {
            LibraryError::StringTooLong => "The supplied string is too long",
            LibraryError::InvalidSlot => "The given slot is invalid",
            LibraryError::InvalidHexString => "The supplied string is not in hexadecimal format",
            LibraryError::TargetBufferTooSmall => "The target buffer is too small",
            LibraryError::InvalidString => "You passed a string containing a null byte",
        })
    }
}