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use ws;
use authcode_store::AuthCodes;
use std::path::{PathBuf, Path};
use std::sync::Arc;
use std::str::FromStr;
use jsonrpc_core::{Metadata};
use jsonrpc_core::reactor::RpcHandler;
use util::{H256, version};
#[cfg(feature = "parity-ui")]
mod ui {
extern crate parity_ui as ui;
extern crate parity_dapps_glue as dapps;
use self::dapps::WebApp;
#[derive(Default)]
pub struct Handler {
ui: ui::App,
}
impl Handler {
pub fn handle(&self, req: &str) -> Option<&dapps::File> {
let file = match req {
"" | "/" => "index.html",
path => &path[1..],
};
self.ui.file(file)
}
}
}
#[cfg(not(feature = "parity-ui"))]
mod ui {
pub struct File {
pub content: &'static [u8],
pub content_type: &'static str,
}
#[derive(Default)]
pub struct Handler;
impl Handler {
pub fn handle(&self, _req: &str) -> Option<&File> {
None
}
}
}
const HOME_DOMAIN: &'static str = "home.parity";
fn origin_is_allowed(self_origin: &str, header: Option<&[u8]>) -> bool {
match header {
None => false,
Some(h) => {
let v = String::from_utf8(h.to_owned()).ok();
match v {
Some(ref origin) if origin.starts_with("chrome-extension://") => true,
Some(ref origin) if origin.starts_with(self_origin) => true,
Some(ref origin) if origin.starts_with(&format!("http://{}", self_origin)) => true,
Some(ref origin) if origin.starts_with(HOME_DOMAIN) => true,
Some(ref origin) if origin.starts_with(&format!("http://{}", HOME_DOMAIN)) => true,
_ => false
}
}
}
}
fn auth_is_valid(codes_path: &Path, protocols: ws::Result<Vec<&str>>) -> bool {
match protocols {
Ok(ref protocols) if protocols.len() == 1 => {
protocols.iter().any(|protocol| {
let mut split = protocol.split('_');
let auth = split.next().and_then(|v| H256::from_str(v).ok());
let time = split.next().and_then(|v| u64::from_str_radix(v, 10).ok());
if let (Some(auth), Some(time)) = (auth, time) {
AuthCodes::from_file(codes_path)
.map(|mut codes| {
codes.clear_garbage();
let res = codes.is_valid(&auth, time);
if codes.to_file(codes_path).is_err() {
warn!(target: "signer", "Couldn't save authorization codes to file.");
}
res
})
.unwrap_or(false)
} else {
false
}
})
},
_ => false
}
}
fn add_headers(mut response: ws::Response, mime: &str) -> ws::Response {
let content_len = format!("{}", response.len());
{
let mut headers = response.headers_mut();
headers.push(("X-Frame-Options".into(), b"SAMEORIGIN".to_vec()));
headers.push(("X-XSS-Protection".into(), b"1; mode=block".to_vec()));
headers.push(("X-Content-Type-Options".into(), b"nosniff".to_vec()));
headers.push(("Server".into(), b"Parity/SignerUI".to_vec()));
headers.push(("Content-Length".into(), content_len.as_bytes().to_vec()));
headers.push(("Content-Type".into(), mime.as_bytes().to_vec()));
headers.push(("Connection".into(), b"close".to_vec()));
}
response
}
pub struct Session<M: Metadata> {
out: ws::Sender,
skip_origin_validation: bool,
self_origin: String,
authcodes_path: PathBuf,
handler: RpcHandler<M>,
file_handler: Arc<ui::Handler>,
}
impl<M: Metadata> ws::Handler for Session<M> {
#[cfg_attr(feature="dev", allow(collapsible_if))]
fn on_request(&mut self, req: &ws::Request) -> ws::Result<(ws::Response)> {
trace!(target: "signer", "Handling request: {:?}", req);
let resource = req.resource().trim_left_matches(&format!("http://{}", HOME_DOMAIN));
let is_styles_file = resource == "/styles.css";
if !self.skip_origin_validation {
let origin = req.header("origin").or_else(|| req.header("Origin")).map(|x| &x[..]);
let host = req.header("host").or_else(|| req.header("Host")).map(|x| &x[..]);
let is_valid = origin_is_allowed(&self.self_origin, origin) || (origin.is_none() && origin_is_allowed(&self.self_origin, host));
let is_valid = is_styles_file || is_valid;
if !is_valid {
warn!(target: "signer", "Blocked connection to Signer API from untrusted origin.");
return Ok(error(
ErrorType::Forbidden,
"URL Blocked",
"You are not allowed to access Trusted Signer using this URL.",
Some(&format!("Use: http://{}", self.self_origin)),
));
}
}
if req.method() == "CONNECT" {
let mut res = ws::Response::ok("".into());
res.headers_mut().push(("Content-Length".into(), b"0".to_vec()));
res.headers_mut().push(("Connection".into(), b"keep-alive".to_vec()));
return Ok(res);
}
if req.header("sec-websocket-key").is_some() && !is_styles_file {
if !auth_is_valid(&self.authcodes_path, req.protocols()) {
info!(target: "signer", "Unauthorized connection to Signer API blocked.");
return Ok(error(ErrorType::Forbidden, "Not Authorized", "Request to this API was not authorized.", None));
}
let protocols = req.protocols().expect("Existence checked by authorization.");
let protocol = protocols.get(0).expect("Proved by authorization.");
return ws::Response::from_request(req).map(|mut res| {
res.set_protocol(protocol);
res
});
}
debug!(target: "signer", "Requesting resource: {:?}", resource);
Ok(self.file_handler.handle(resource)
.map_or_else(
|| error(ErrorType::NotFound, "Not found", "Requested file was not found.", None),
|f| add_headers(ws::Response::ok_raw(f.content.to_vec()), f.content_type)
))
}
fn on_message(&mut self, msg: ws::Message) -> ws::Result<()> {
let req = msg.as_text()?;
let out = self.out.clone();
let metadata = Default::default();
self.handler.handle_request(req, metadata, move |response| {
if let Some(result) = response {
let res = out.send(result);
if let Err(e) = res {
warn!(target: "signer", "Error while sending response: {:?}", e);
}
}
});
Ok(())
}
}
pub struct Factory<M: Metadata> {
handler: RpcHandler<M>,
skip_origin_validation: bool,
self_origin: String,
authcodes_path: PathBuf,
file_handler: Arc<ui::Handler>,
}
impl<M: Metadata> Factory<M> {
pub fn new(handler: RpcHandler<M>, self_origin: String, authcodes_path: PathBuf, skip_origin_validation: bool) -> Self {
Factory {
handler: handler,
skip_origin_validation: skip_origin_validation,
self_origin: self_origin,
authcodes_path: authcodes_path,
file_handler: Arc::new(ui::Handler::default()),
}
}
}
impl<M: Metadata> ws::Factory for Factory<M> {
type Handler = Session<M>;
fn connection_made(&mut self, sender: ws::Sender) -> Self::Handler {
Session {
out: sender,
handler: self.handler.clone(),
skip_origin_validation: self.skip_origin_validation,
self_origin: self.self_origin.clone(),
authcodes_path: self.authcodes_path.clone(),
file_handler: self.file_handler.clone(),
}
}
}
enum ErrorType {
NotFound,
Forbidden,
}
fn error(error: ErrorType, title: &str, message: &str, details: Option<&str>) -> ws::Response {
let content = format!(
include_str!("./error_tpl.html"),
title=title,
meta="",
message=message,
details=details.unwrap_or(""),
version=version(),
);
let res = match error {
ErrorType::NotFound => ws::Response::not_found(content),
ErrorType::Forbidden => ws::Response::forbidden(content),
};
add_headers(res, "text/html")
}