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
extern crate base64;
extern crate crypto_mac;
#[cfg(feature = "online-tokio")]
extern crate futures;
extern crate hmac;
extern crate rand;
extern crate reqwest;
extern crate sha1;
extern crate subtle;
extern crate threadpool;
#[macro_use]
extern crate url;
extern crate core;
#[cfg(feature = "online-tokio")]
pub mod async;
pub mod config;
mod sec;
pub mod sync;
pub mod yubicoerror;
use std::collections::BTreeMap;
use base64::{decode, encode};
use config::Config;
use rand::distributions::Alphanumeric;
use rand::rngs::OsRng;
use rand::Rng;
use url::percent_encoding::{utf8_percent_encode, SIMPLE_ENCODE_SET};
use yubicoerror::YubicoError;
#[cfg(feature = "online-tokio")]
pub use async::verify_async;
pub use sync::verify;
type Result<T> = ::std::result::Result<T, YubicoError>;
define_encode_set! {
pub QUERY_ENCODE_SET = [SIMPLE_ENCODE_SET] | {'+', '='}
}
#[derive(Clone)]
pub struct Request {
query: String,
response_verifier: ResponseVerifier,
}
impl Request {
fn build_url(&self, for_api_host: &str) -> String {
format!("{}?{}", for_api_host, self.query)
}
}
#[derive(Clone)]
pub struct ResponseVerifier {
otp: String,
nonce: String,
key: Vec<u8>,
}
impl ResponseVerifier {
fn verify_response(&self, raw_response: String) -> Result<()> {
let response_map: BTreeMap<String, String> = build_response_map(raw_response);
let status: &str = &*response_map.get("status").unwrap();
if let "OK" = status {
let signature_response: &str = &*response_map.get("h").unwrap();
if !is_same_signature(signature_response, response_map.clone(), &self.key) {
return Err(YubicoError::SignatureMismatch);
}
let otp_response: &str = &*response_map.get("otp").unwrap();
if !self.otp.eq(otp_response) {
return Err(YubicoError::OTPMismatch);
}
let nonce_response: &str = &*response_map.get("nonce").unwrap();
if !self.nonce.eq(nonce_response) {
return Err(YubicoError::NonceMismatch);
}
Ok(())
} else {
match status {
"BAD_OTP" => Err(YubicoError::BadOTP),
"REPLAYED_OTP" => Err(YubicoError::ReplayedOTP),
"BAD_SIGNATURE" => Err(YubicoError::BadSignature),
"MISSING_PARAMETER" => Err(YubicoError::MissingParameter),
"NO_SUCH_CLIENT" => Err(YubicoError::NoSuchClient),
"OPERATION_NOT_ALLOWED" => Err(YubicoError::OperationNotAllowed),
"BACKEND_ERROR" => Err(YubicoError::BackendError),
"NOT_ENOUGH_ANSWERS" => Err(YubicoError::NotEnoughAnswers),
"REPLAYED_REQUEST" => Err(YubicoError::ReplayedRequest),
_ => Err(YubicoError::UnknownStatus),
}
}
}
}
fn build_request<S>(otp: S, config: &Config) -> Result<Request>
where
S: Into<String>,
{
let str_otp = otp.into();
let str_otp = str_otp.trim().to_string();
match printable_characters(&str_otp) {
false => Err(YubicoError::BadOTP),
_ => {
let nonce: String = generate_nonce();
let mut query = format!(
"id={}&nonce={}&otp={}&sl={}",
config.client_id, nonce, str_otp, config.sync_level
);
match sec::build_signature(&config.key, query.as_bytes()) {
Ok(signature) => {
let encoded_signature = encode(&signature.code());
let signature_param = format!("&h={}", encoded_signature);
let encoded = utf8_percent_encode(signature_param.as_ref(), QUERY_ENCODE_SET)
.collect::<String>();
query.push_str(encoded.as_ref());
let verifier = ResponseVerifier {
otp: str_otp,
nonce,
key: config.key.clone(),
};
let request = Request {
query,
response_verifier: verifier,
};
Ok(request)
}
Err(error) => return Err(error),
}
}
}
}
fn printable_characters(otp: &str) -> bool {
for c in otp.chars() {
if !c.is_ascii() {
return false;
}
}
otp.len() > 32 && otp.len() < 48
}
fn generate_nonce() -> String {
OsRng::new()
.unwrap()
.sample_iter(&Alphanumeric)
.take(40)
.collect()
}
fn is_same_signature(
signature_response: &str,
mut response_map: BTreeMap<String, String>,
key: &[u8],
) -> bool {
response_map.remove("h");
let mut query = String::new();
for (key, value) in response_map {
let param = format!("{}={}&", key, value);
query.push_str(param.as_ref());
}
query.pop();
if let Ok(signature) = sec::build_signature(key, query.as_bytes()) {
let decoded_signature = &decode(signature_response).unwrap()[..];
use subtle::ConstantTimeEq;
signature.code().ct_eq(decoded_signature).into()
} else {
return false;
}
}
fn build_response_map(result: String) -> BTreeMap<String, String> {
let mut parameters = BTreeMap::new();
for line in result.lines() {
let param: Vec<&str> = line.splitn(2, '=').collect();
if param.len() > 1 {
parameters.insert(param[0].to_string(), param[1].to_string());
}
}
parameters
}