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use std::collections::HashSet;
use std::str;
use chrono::Duration;
use cookie::Cookie;
use crypto::aead::{AeadEncryptor, AeadDecryptor};
use crypto::chacha20poly1305::ChaCha20Poly1305;
use crypto::scrypt::{scrypt, ScryptParams};
use iron::headers::{SetCookie, Cookie as IronCookie};
use iron::method;
use iron::middleware::{AroundMiddleware, Handler};
use iron::prelude::*;
use iron::status;
use iron::typemap;
use ring::rand::SystemRandom;
use protobuf;
use protobuf::Message;
use rustc_serialize::base64::{FromBase64, ToBase64, STANDARD};
use time;
use urlencoded::{UrlEncodedQuery, UrlEncodedBody};
use error::{CsrfError, CsrfConfigError};
use transport::{CsrfTokenTransport, CsrfCookieTransport};
pub const CSRF_COOKIE_NAME: &'static str = "csrf";
pub const CSRF_FORM_FIELD: &'static str = "csrf-token";
pub const CSRF_HEADER: &'static str = "X-CSRF-Token";
pub const CSRF_QUERY_STRING: &'static str = "csrf-token";
header! { (XCsrfToken, CSRF_HEADER) => [String] }
#[derive(Eq, PartialEq, Debug)]
pub struct CsrfToken {
bytes: Vec<u8>,
}
impl CsrfToken {
fn new(bytes: Vec<u8>) -> Self {
CsrfToken { bytes: bytes }
}
pub fn b64_string(&self) -> String {
self.bytes.to_base64(STANDARD)
}
}
#[derive(Debug, Eq, PartialEq)]
pub struct CsrfCookie {
bytes: Vec<u8>,
}
impl CsrfCookie {
fn new(bytes: Vec<u8>) -> Self {
CsrfCookie { bytes: bytes }
}
pub fn b64_string(&self) -> String {
self.bytes.to_base64(STANDARD)
}
}
pub struct CsrfConfig {
ttl_seconds: i64,
protected_methods: HashSet<method::Method>,
secure_cookie: bool,
}
impl CsrfConfig {
pub fn build() -> CsrfConfigBuilder {
CsrfConfigBuilder { config: CsrfConfig::default() }
}
}
impl Default for CsrfConfig {
fn default() -> Self {
let protected_methods: HashSet<method::Method> =
vec![method::Post, method::Put, method::Patch, method::Delete]
.iter()
.cloned()
.collect();
CsrfConfig {
ttl_seconds: 3600,
protected_methods: protected_methods,
secure_cookie: false,
}
}
}
pub struct CsrfConfigBuilder {
config: CsrfConfig,
}
impl CsrfConfigBuilder {
pub fn ttl_seconds(mut self, ttl_seconds: i64) -> Self {
self.config.ttl_seconds = ttl_seconds;
self
}
pub fn protected_methods(mut self, protected_methods: HashSet<method::Method>) -> Self {
self.config.protected_methods = protected_methods;
self
}
pub fn secure_cookie(mut self, secure_cookie: bool) -> Self {
self.config.secure_cookie = secure_cookie;
self
}
pub fn finish(self) -> Result<CsrfConfig, CsrfConfigError> {
let config = self.config;
if config.ttl_seconds < 0 {
return Err(CsrfConfigError::InvalidTtl);
}
if config.protected_methods.is_empty() {
return Err(CsrfConfigError::NoProtectedMethods);
}
Ok(config)
}
}
pub trait CsrfProtection: Sized + Send + Sync {
fn parse_token(&self, bytes: &[u8]) -> Result<CsrfTokenTransport, CsrfError>;
fn parse_cookie(&self, bytes: &[u8]) -> Result<CsrfCookieTransport, CsrfError>;
fn generate_token_pair(&self, previous_token: Option<Vec<u8>>, ttl_seconds: i64) -> Result<(CsrfToken, CsrfCookie), CsrfError>;
fn verify_token_pair(&self, token: &CsrfTokenTransport, cookie: &CsrfCookieTransport) -> bool {
let tokens_match = token.get_token() == cookie.get_token();
let not_expired = cookie.get_expires() > time::precise_time_s() as u64;
tokens_match && not_expired
}
}
pub struct ChaCha20Poly1305CsrfProtection {
rng: SystemRandom,
key: [u8; 32],
nonce: [u8; 8],
aad: [u8; 32],
}
impl ChaCha20Poly1305CsrfProtection {
pub fn from_password(password: &[u8]) -> Result<ChaCha20Poly1305CsrfProtection, CsrfError> {
#[cfg(test)]
let params = ScryptParams::new(1, 8, 1);
#[cfg(not(test))]
let params = ScryptParams::new(14, 8, 1);
let salt = b"iron-csrf-scrypt-salt";
let mut out = [0; 72];
info!("Generating key material. This may take some time.");
scrypt(password, salt, ¶ms, &mut out);
info!("Key material generated.");
let mut key = [0; 32];
let mut nonce = [0; 8];
let mut aad = [0; 32];
for i in 0..32 {
key[i] = out[i]
}
for i in 0..8 {
nonce[i] = out[i + 32]
}
for i in 0..32 {
aad[i] = out[i + 40]
}
let _ = ChaCha20Poly1305::new(&key, &nonce, &aad);
Ok(ChaCha20Poly1305CsrfProtection {
rng: SystemRandom::new(),
key: key,
nonce: nonce,
aad: aad,
})
}
fn aead(&self) -> ChaCha20Poly1305 {
ChaCha20Poly1305::new(&self.key, &self.nonce, &self.aad)
}
fn random_bytes(&self, buf: &mut [u8]) -> Result<(), CsrfError> {
self.rng
.fill(buf)
.map_err(|_| {
warn!("Failed to get random bytes");
CsrfError::InternalError
})
}
fn generate_cookie(&self, token: &[u8], ttl_seconds: i64) -> Result<CsrfCookie, CsrfError> {
let mut aead = self.aead();
let expires = time::precise_time_s() as u64 + ttl_seconds as u64;
let mut cookie_unencrypted = CsrfCookieTransport::new();
cookie_unencrypted.set_token(token.to_vec());
cookie_unencrypted.set_expires(expires);
let cookie_unencrypted = cookie_unencrypted.write_to_bytes()
.map_err(|err| {
warn!("Could not write CSRF cookie: {}", err);
CsrfError::InternalError
})?;
let mut cookie_encrypted = vec![0; cookie_unencrypted.len()];
let mut sig = vec![0; 16];
aead.encrypt(&cookie_unencrypted, &mut cookie_encrypted, &mut sig);
cookie_encrypted.extend(sig);
Ok(CsrfCookie::new(cookie_encrypted))
}
fn generate_token(&self, token: &[u8]) -> Result<CsrfToken, CsrfError> {
let mut aead = self.aead();
let mut token_unencrypted = CsrfTokenTransport::new();
token_unencrypted.set_token(token.to_vec());
let token_unencrypted = token_unencrypted.write_to_bytes()
.map_err(|err| {
warn!("Could not write CSRF token: {}", err);
CsrfError::InternalError
})?;
let mut token_encrypted = vec![0; token_unencrypted.len()];
let mut sig = vec![0; 16];
aead.encrypt(&token_unencrypted, &mut token_encrypted, &mut sig);
token_encrypted.extend(sig);
Ok(CsrfToken::new(token_encrypted))
}
}
impl CsrfProtection for ChaCha20Poly1305CsrfProtection {
fn parse_cookie(&self, cookie: &[u8]) -> Result<CsrfCookieTransport, CsrfError> {
if cookie.len() <= 16 {
return Err(CsrfError::ValidationFailure);
}
let encrypted_body = &cookie[0..(cookie.len() - 16)];
let sig = &cookie[(cookie.len() - 16)..cookie.len()];
let mut aead = self.aead();
let mut decrypted_body = vec![0; encrypted_body.len()];
let valid = aead.decrypt(encrypted_body, &mut decrypted_body, sig);
if !valid {
info!("Unable to decrypt and authenticate CSRF cookie");
return Err(CsrfError::ValidationFailure)
}
protobuf::core::parse_from_bytes::<CsrfCookieTransport>(&decrypted_body)
.map(|r| {
debug!("Successfully parsed CSRF cookie contents");
r
})
.map_err(|err| {
info!("Unable to parse CSRF cookie contents: {}", err);
CsrfError::ValidationFailure
})
}
fn parse_token(&self, token: &[u8]) -> Result<CsrfTokenTransport, CsrfError> {
if token.len() <= 16 {
return Err(CsrfError::ValidationFailure);
}
let encrypted_body = &token[0..(token.len() - 16)];
let sig = &token[(token.len() - 16)..token.len()];
let mut aead = self.aead();
let mut decrypted_body = vec![0; encrypted_body.len()];
let valid = aead.decrypt(encrypted_body, &mut decrypted_body, sig);
if !valid {
info!("Unable to decrypt and authenticate CSRF token");
return Err(CsrfError::ValidationFailure)
}
protobuf::core::parse_from_bytes::<CsrfTokenTransport>(&decrypted_body)
.map(|r| {
debug!("Successfully parsed CSRF token contents");
r
})
.map_err(|err| {
info!("Unable to parse CSRF token contents: {}", err);
CsrfError::ValidationFailure
})
}
fn generate_token_pair(&self, previous_token: Option<Vec<u8>>, ttl_seconds: i64) -> Result<(CsrfToken, CsrfCookie), CsrfError> {
let mut token = vec![0; 64];
match previous_token {
Some(ref previous) if previous.len() == 64 => {
for i in 0..64 {
token[i] = previous[i];
}
}
_ => self.random_bytes(&mut token)?,
}
match (self.generate_token(&token), self.generate_cookie(&token, ttl_seconds)) {
(Ok(t), Ok(c)) => Ok((t, c)),
_ => Err(CsrfError::ValidationFailure),
}
}
}
impl typemap::Key for CsrfToken {
type Value = CsrfToken;
}
struct CsrfHandler<P: CsrfProtection, H: Handler> {
protect: P,
config: CsrfConfig,
handler: H,
}
impl<P: CsrfProtection, H: Handler> CsrfHandler<P, H> {
fn new(protect: P, config: CsrfConfig, handler: H) -> Self {
CsrfHandler {
protect: protect,
config: config,
handler: handler,
}
}
fn extract_csrf_cookie(&self, request: &Request) -> Option<Vec<u8>> {
request.headers
.get::<IronCookie>()
.and_then(|raw_cookie| {
raw_cookie.0
.iter()
.filter_map(|c| {
Cookie::parse_encoded(c.clone())
.ok()
.and_then(|cookie| match cookie.name_value() {
(CSRF_COOKIE_NAME, value) => Some(value.to_string()),
_ => None,
})
.and_then(|c| c.from_base64().ok())
})
.collect::<Vec<Vec<u8>>>()
.first()
.map(|c| c.clone())
})
}
fn extract_csrf_token(&self, mut request: &mut Request) -> Option<Vec<u8>> {
let f_token = self.extract_csrf_token_from_form_url_encoded(&mut request);
let q_token = self.extract_csrf_token_from_query(&mut request);
let h_token = self.extract_csrf_token_from_headers(&mut request);
debug!("CSRF token found in Form: {}, Query: {}, Header: {}",
f_token.is_some(),
q_token.is_some(),
h_token.is_some());
f_token.or(q_token).or(h_token)
}
fn extract_csrf_token_from_form_url_encoded(&self,
mut request: &mut Request)
-> Option<Vec<u8>> {
let token = request.get_ref::<UrlEncodedBody>()
.ok()
.and_then(|form| form.get(CSRF_FORM_FIELD))
.and_then(|vs| {
vs.iter()
.filter_map(|v| v.from_base64().ok())
.next()
});
token.map(|t| t.clone())
}
fn extract_csrf_token_from_query(&self, mut request: &mut Request) -> Option<Vec<u8>> {
let token = request.get_ref::<UrlEncodedQuery>()
.ok()
.and_then(|query| query.get(CSRF_QUERY_STRING))
.and_then(|vs| {
vs.iter()
.filter_map(|v| v.from_base64().ok())
.next()
});
token.map(|t| t.clone())
}
fn extract_csrf_token_from_headers(&self, mut request: &mut Request) -> Option<Vec<u8>> {
let token = request.headers
.get::<XCsrfToken>()
.map(|t| t.to_string())
.and_then(|s| s.from_base64().ok());
let _ = request.headers.remove::<XCsrfToken>();
token
}
}
impl<P: CsrfProtection + Sized + 'static, H: Handler> Handler for CsrfHandler<P, H> {
fn handle(&self, mut request: &mut Request) -> IronResult<Response> {
let token_opt = self.extract_csrf_token(&mut request)
.and_then(|t| self.protect.parse_token(&t).ok());
let cookie_opt = self.extract_csrf_cookie(&request)
.and_then(|c| self.protect.parse_cookie(&c).ok());
if self.config.protected_methods.contains(&request.method) {
debug!("CSRF elements present. Token: {}, Cookie: {}",
token_opt.is_some(),
cookie_opt.is_some());
match (token_opt.clone(), cookie_opt) {
(Some(token), Some(cookie)) => {
let no_match = token.get_token() != cookie.get_token();
let expired = cookie.get_expires() < time::precise_time_s() as u64;
if no_match && expired {
return Ok(Response::with((status::Forbidden, "CSRF Error")));
}
}
_ => return Ok(Response::with((status::Forbidden, "CSRF Error"))),
}
}
let (token, csrf_cookie) = self.protect.generate_token_pair(token_opt.map(|mut t| t.take_token()),
self.config.ttl_seconds)?;
let _ = request.extensions.insert::<CsrfToken>(token);
let mut response = self.handler.handle(&mut request)?;
let cookie = Cookie::build(CSRF_COOKIE_NAME, csrf_cookie.b64_string())
.path("/")
.http_only(true)
.secure(self.config.secure_cookie)
.max_age(Duration::seconds(self.config.ttl_seconds))
.finish();
let mut cookies = vec![format!("{}", cookie.encoded())];
{
if let Some(set_cookie) = response.headers.get::<SetCookie>() {
cookies.extend(set_cookie.0.clone())
}
}
response.headers.set(SetCookie(cookies));
Ok(response)
}
}
pub struct CsrfProtectionMiddleware<P: CsrfProtection> {
protect: P,
config: CsrfConfig,
}
impl<P: CsrfProtection + Sized + 'static> CsrfProtectionMiddleware<P> {
pub fn new(protect: P, config: CsrfConfig) -> Self {
CsrfProtectionMiddleware {
protect: protect,
config: config,
}
}
}
impl<P: CsrfProtection + Sized + 'static> AroundMiddleware for CsrfProtectionMiddleware<P> {
fn around(self, handler: Box<Handler>) -> Box<Handler> {
Box::new(CsrfHandler::new(self.protect, self.config, handler))
}
}
#[cfg(test)]
mod tests {
use super::*;
use hyper::header::Headers;
use hyper::method::Method::Extension;
use iron_test::request as mock_request;
use iron_test::response::extract_body_to_string;
use urlencoding::encode as url_encode;
#[test]
fn test_chachah20poly1305_csrf_protection() {
let password = b"hunter2";
let protect = ChaCha20Poly1305CsrfProtection::from_password(password)
.expect("couldn't create protection");
let (token, cookie) = protect.generate_token_pair(None, 300)
.expect("couldn't generate token/cookie pair");
let token = token.b64_string().from_base64().expect("token not base64");
let token = protect.parse_token(&token).expect("token not parsed");
let cookie = cookie.b64_string().from_base64().expect("cookie not base64");
let cookie = protect.parse_cookie(&cookie).expect("cookie not parsed");
assert!(protect.verify_token_pair(&token, &cookie),
"could not verify token/cookie pair");
}
#[test]
fn test_config() {
assert!(CsrfConfig::build().ttl_seconds(0).finish().is_ok());
assert!(CsrfConfig::build().ttl_seconds(-1).finish().is_err());
assert!(CsrfConfig::build().protected_methods(HashSet::new()).finish().is_err())
}
fn test_encrypted_protection<P: CsrfProtection>(middleware: CsrfProtectionMiddleware<P>) {
let (token, cookie) = middleware.protect.generate_token_pair(None, 300).unwrap();
let token = token.b64_string().from_base64().expect("token not base64");
let token = middleware.protect.parse_token(&token).expect("token not parsed");
let cookie = cookie.b64_string().from_base64().expect("cookie not base64");
let cookie = middleware.protect.parse_cookie(&cookie).expect("cookie not parsed");
assert!(middleware.protect.verify_token_pair(&token, &cookie));
let (token, cookie) = middleware.protect.generate_token_pair(None,300).unwrap();
let mut token = token.b64_string().from_base64().expect("token not base64");
token[0] = token[0] ^ 0x01;
assert!(middleware.protect.parse_token(&token).is_err());
token[0] = token[0] ^ 0x01;
let len = token.len();
token[len - 1] = token[len - 1] ^ 0x01;
assert!(middleware.protect.parse_token(&token).is_err());
let mut cookie = cookie.b64_string().from_base64().expect("cookie not base64");
cookie[0] = cookie[0] ^ 0x01;
assert!(middleware.protect.parse_cookie(&cookie).is_err());
cookie[0] = cookie[0] ^ 0x01;
let len = cookie.len();
cookie[len - 1] = cookie[len - 1] ^ 0x01;
assert!(middleware.protect.parse_cookie(&cookie).is_err());
let (token, cookie) = middleware.protect.generate_token_pair(None, 0).unwrap();
let token = token.b64_string().from_base64().expect("token not base64");
let token = middleware.protect.parse_token(&token).expect("token not parsed");
let cookie = cookie.b64_string().from_base64().expect("cookie not base64");
let cookie = middleware.protect.parse_cookie(&cookie).expect("cookie not parsed");
assert!(!middleware.protect.verify_token_pair(&token, &cookie));
let (token, _) = middleware.protect.generate_token_pair(None, 300).unwrap();
let (_, cookie) = middleware.protect.generate_token_pair(None, 300).unwrap();
let token = token.b64_string().from_base64().expect("token not base64");
let token = middleware.protect.parse_token(&token).expect("token not parsed");
let cookie = cookie.b64_string().from_base64().expect("cookie not base64");
let cookie = middleware.protect.parse_cookie(&cookie).expect("cookie not parsed");
assert!(!middleware.protect.verify_token_pair(&token, &cookie));
}
fn mock_handler(request: &mut Request) -> IronResult<Response> {
let token = request.extensions
.get::<CsrfToken>()
.map(|t| t.b64_string())
.unwrap_or("".to_string());
Ok(Response::with((status::Ok, token)))
}
fn test_middleware<P: CsrfProtection + 'static>(protect: P) {
let config = CsrfConfig::default();
let middleware = CsrfProtectionMiddleware::new(protect, config);
let handler = middleware.around(Box::new(mock_handler));
let response = mock_request::get("http://localhost/", Headers::new(), &handler).unwrap();
assert_eq!(response.status, Some(status::Ok));
let (csrf_token, csrf_cookie) = {
let headers = response.headers.clone();
let set_cookie = headers.get::<SetCookie>().unwrap();
let cookie = Cookie::parse(set_cookie.0[0].clone()).unwrap();
(extract_body_to_string(response), format!("{}", cookie))
};
let body_methods = vec![method::Post,
method::Put,
method::Patch,
method::Connect,
Extension("WAT".to_string())];
let all_methods = vec![method::Get,
method::Post,
method::Put,
method::Patch,
method::Delete,
method::Options,
method::Connect,
method::Trace,
Extension("WAT".to_string())];
let path = "http://localhost/";
let mut headers = Headers::new();
headers.set(IronCookie(vec![csrf_cookie.clone()]));
let body = "";
let response = mock_request::get(path, headers.clone(), &handler).unwrap();
assert_eq!(response.status, Some(status::Ok));
let response = mock_request::head(path, headers.clone(), &handler).unwrap();
assert_eq!(response.status, Some(status::Ok));
let response = mock_request::head(path, headers.clone(), &handler).unwrap();
assert_eq!(response.status, Some(status::Ok));
let response = mock_request::request(method::Trace, path, body, headers.clone(), &handler)
.unwrap();
assert_eq!(response.status, Some(status::Ok));
let response =
mock_request::request(method::Connect, path, body, headers.clone(), &handler).unwrap();
assert_eq!(response.status, Some(status::Ok));
let response = mock_request::request(Extension("WAT".to_string()),
path,
body,
headers.clone(),
&handler)
.unwrap();
assert_eq!(response.status, Some(status::Ok));
let response = mock_request::post(path, headers.clone(), body, &handler).unwrap();
assert_eq!(response.status, Some(status::Forbidden));
let response = mock_request::put(path, headers.clone(), body, &handler).unwrap();
assert_eq!(response.status, Some(status::Forbidden));
let response = mock_request::put(path, headers.clone(), body, &handler).unwrap();
assert_eq!(response.status, Some(status::Forbidden));
let response = mock_request::patch(path, headers.clone(), body, &handler).unwrap();
assert_eq!(response.status, Some(status::Forbidden));
let path = "http://localhost/";
let mut headers = Headers::new();
headers.set(IronCookie(vec![csrf_cookie.clone()]));
headers.set(XCsrfToken(csrf_token.clone()));
let body = "";
for verb in all_methods.iter().cloned() {
let response = mock_request::request(verb, path, body, headers.clone(), &handler)
.unwrap();
assert_eq!(response.status, Some(status::Ok));
}
let path = format!("http://localhost/?{}={}",
CSRF_QUERY_STRING,
url_encode(&csrf_token));
let path = path.as_str();
let mut headers = Headers::new();
headers.set(IronCookie(vec![csrf_cookie.clone()]));
let body = "";
for verb in all_methods.iter().cloned() {
let response = mock_request::request(verb, path, body, headers.clone(), &handler)
.unwrap();
assert_eq!(response.status, Some(status::Ok));
}
let path = "http://localhost/";
let mut headers = Headers::new();
headers.set(IronCookie(vec![csrf_cookie.clone()]));
headers.set_raw("content-type",
vec![b"application/x-www-form-urlencoded".to_vec()]);
let body = format!("{}={}", CSRF_QUERY_STRING, url_encode(&csrf_token));
let body = body.as_str();
for verb in body_methods.iter().cloned() {
let response = mock_request::request(verb, path, body, headers.clone(), &handler)
.unwrap();
assert_eq!(response.status, Some(status::Ok));
}
}
#[test]
fn test_chacha20poly1305_protection() {
let password = b"hunter2";
let protect = ChaCha20Poly1305CsrfProtection::from_password(password)
.expect("failed to make protection");
let middleware = CsrfProtectionMiddleware::new(protect, CsrfConfig::default());
test_encrypted_protection(middleware);
}
#[test]
fn test_chacha20poly1305_middleware() {
let password = b"hunter2";
let protect = ChaCha20Poly1305CsrfProtection::from_password(password)
.expect("failed to make protection");
test_middleware(protect);
}
}