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#[macro_use] extern crate url;
#[macro_use] extern crate hyper;
extern crate hyper_native_tls;
extern crate base64;
extern crate crypto;
extern crate rand;
extern crate threadpool;
pub mod yubicoerror;
use std::ascii::AsciiExt;
use yubicoerror::YubicoError;
use hyper::net::HttpsConnector;
use hyper_native_tls::NativeTlsClient;
use hyper::header::{Headers};
use std::io::prelude::*;
use base64::{encode, decode};
use crypto::mac::{Mac, MacResult};
use crypto::hmac::Hmac;
use crypto::sha1::Sha1;
use rand::{OsRng, Rng};
use threadpool::ThreadPool;
use std::collections::BTreeMap;
use std::sync::mpsc::{ channel, Sender };
use url::percent_encoding::{utf8_percent_encode, SIMPLE_ENCODE_SET};
define_encode_set! {
pub QUERY_ENCODE_SET = [SIMPLE_ENCODE_SET] | {'+', '='}
}
static API1_HOST : &'static str = "https://api.yubico.com/wsapi/2.0/verify";
static API2_HOST : &'static str = "https://api2.yubico.com/wsapi/2.0/verify";
static API3_HOST : &'static str = "https://api3.yubico.com/wsapi/2.0/verify";
static API4_HOST : &'static str = "https://api4.yubico.com/wsapi/2.0/verify";
static API5_HOST : &'static str = "https://api5.yubico.com/wsapi/2.0/verify";
header! { (UserAgent, "User-Agent") => [String] }
type Result<T> = ::std::result::Result<T, YubicoError>;
enum Response {
Signal(Result<String>),
}
#[derive(Clone)]
pub struct Request {
otp: String,
nonce: String,
signature: String,
query: String,
}
#[derive(Clone)]
pub struct Yubico {
client_id: String,
key: Vec<u8>,
}
impl Yubico {
pub fn new(client_id: String, key: String) -> Self {
Yubico {
client_id: client_id,
key: decode(&key[..]).unwrap(),
}
}
pub fn verify(&self, otp: String) -> Result<String> {
match self.printable_characters(otp.clone()) {
false => Err(YubicoError::BadOTP),
_ => {
let nonce: String = self.generate_nonce();
let mut query = format!("id={}&nonce={}&otp={}&sl=secure", self.client_id, nonce, otp);
let signature = self.build_signature(query.clone());
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 request = Request {otp: otp, nonce: nonce, signature: encoded_signature, query: query};
let pool = ThreadPool::new(3);
let (tx, rx) = channel();
let api_hosts = vec![API1_HOST, API2_HOST, API3_HOST, API4_HOST, API5_HOST];
for api_host in api_hosts {
let tx = tx.clone();
let request = request.clone();
let self_clone = self.clone();
pool.execute(move|| { self_clone.process(tx, api_host, request) });
}
let mut results: Vec<Result<String>> = Vec::new();
for _ in 0..5 {
match rx.recv() {
Ok(Response::Signal(result)) => {
match result {
Ok(_) => {
results.truncate(0);
break
},
Err(_) => results.push(result),
}
},
Err(e) => {
results.push(Err(YubicoError::ChannelError(e)));
break
},
}
}
if results.len() == 0 {
Ok("The OTP is valid.".into())
} else {
let result = results.pop().unwrap();
result
}
},
}
}
fn build_signature(&self, query: String) -> MacResult {
let mut hmac = Hmac::new(Sha1::new(), &self.key[..]);
hmac.input(query.as_bytes());
hmac.result()
}
fn printable_characters(&self, otp: String) -> bool {
for c in otp.chars() {
if !c.is_ascii() {
return false;
}
}
otp.len() > 32 && otp.len() < 48
}
fn process(&self, sender: Sender<Response>, api_host: &str, request: Request) {
let url = format!("{}?{}", api_host, request.query);
match self.get(url) {
Ok(result) => {
let response_map: BTreeMap<String, String> = self.build_response_map(result);
let signature_response : &str = &*response_map.get("h").unwrap();
if !self.is_same_signature(signature_response, response_map.clone()) {
sender.send(Response::Signal(Err(YubicoError::SignatureMismatch))).unwrap();
return;
}
let otp_response : &str = &*response_map.get("otp").unwrap();
if !request.otp.contains(otp_response) {
sender.send(Response::Signal(Err(YubicoError::OTPMismatch))).unwrap();
return;
}
let nonce_response : &str = &*response_map.get("nonce").unwrap();
if !request.nonce.contains(nonce_response) {
sender.send(Response::Signal(Err(YubicoError::NonceMismatch))).unwrap();
return;
}
let status: &str = &*response_map.get("status").unwrap();
match status {
"OK" => sender.send(Response::Signal(Ok("The OTP is valid.".to_owned()))).unwrap(),
"BAD_OTP" => sender.send(Response::Signal(Err(YubicoError::BadOTP))).unwrap(),
"REPLAYED_OTP" => sender.send(Response::Signal(Err(YubicoError::ReplayedOTP))).unwrap(),
"BAD_SIGNATURE" => sender.send(Response::Signal(Err(YubicoError::BadSignature))).unwrap(),
"MISSING_PARAMETER" => sender.send(Response::Signal(Err(YubicoError::MissingParameter))).unwrap(),
"NO_SUCH_CLIENT" => sender.send(Response::Signal(Err(YubicoError::NoSuchClient))).unwrap(),
"OPERATION_NOT_ALLOWED" => sender.send(Response::Signal(Err(YubicoError::OperationNotAllowed))).unwrap(),
"BACKEND_ERROR" => sender.send(Response::Signal(Err(YubicoError::BackendError))).unwrap(),
"NOT_ENOUGH_ANSWERS" => sender.send(Response::Signal(Err(YubicoError::NotEnoughAnswers))).unwrap(),
"REPLAYED_REQUEST" => sender.send(Response::Signal(Err(YubicoError::ReplayedRequest))).unwrap(),
_ => sender.send(Response::Signal(Err(YubicoError::UnknownStatus))).unwrap()
}
},
Err(e) => {
sender.send( Response::Signal(Err(e)) ).unwrap();
}
}
}
fn is_same_signature(&self, signature_response: &str, mut response_map: BTreeMap<String, String>) -> 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();
let signature = self.build_signature(query.clone());
let decoded_signature = &decode(signature_response).unwrap()[..];
crypto::util::fixed_time_eq(signature.code(), decoded_signature)
}
fn build_response_map(&self, 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
}
pub fn get(&self, url: String) -> Result<String> {
let ssl = NativeTlsClient::new().unwrap();
let connector = HttpsConnector::new(ssl);
let client = hyper::Client::with_connector(connector);
let mut custom_headers = Headers::new();
custom_headers.set(UserAgent("github.com/wisespace-io/yubico-rs".to_owned()));
let mut response = String::new();
let mut res = try!(client.get(&url).headers(custom_headers).send());
try!(res.read_to_string(&mut response));
Ok(response)
}
fn generate_nonce(&self) -> String {
OsRng::new().unwrap()
.gen_ascii_chars()
.take(40)
.collect()
}
}