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|
//! For accessing keys over the network.
//!
//! Currently, this module provides access to keyservers providing the [HKP] protocol.
//!
//! [HKP]: https://tools.ietf.org/html/draft-shaw-openpgp-hkp-00
//!
//! # Example
//!
//! We provide a very reasonable default key server backed by
//! `hkps.pool.sks-keyservers.net`, the subset of the [SKS keyserver]
//! network that uses https to protect integrity and confidentiality
//! of the communication with the client:
//!
//! [SKS keyserver]: https://www.sks-keyservers.net/overview-of-pools.php#pool_hkps
//!
//! ```no_run
//! # extern crate openpgp;
//! # extern crate sequoia_core;
//! # extern crate sequoia_net;
//! # use openpgp::types::KeyId;
//! # use sequoia_core::Context;
//! # use sequoia_net::{KeyServer, Result};
//! # fn main() { f().unwrap(); }
//! # fn f() -> Result<()> {
//! let ctx = Context::new("org.sequoia-pgp.example")?;
//! let mut ks = KeyServer::sks_pool(&ctx)?;
//! let keyid = KeyId::from_hex("31855247603831FD").unwrap();
//! println!("{:?}", ks.get(&keyid));
//! Ok(())
//! # }
//! ```
extern crate openpgp;
extern crate sequoia_core;
extern crate futures;
extern crate hyper;
extern crate hyper_tls;
extern crate native_tls;
extern crate tokio_core;
#[macro_use]
extern crate percent_encoding;
use percent_encoding::{percent_encode, DEFAULT_ENCODE_SET};
use self::futures::{Future, Stream};
use self::hyper::client::{FutureResponse, HttpConnector};
use self::hyper::header::{ContentLength, ContentType};
use self::hyper::{Client, Uri, StatusCode, Request, Method};
use self::hyper_tls::HttpsConnector;
use self::native_tls::{Certificate, TlsConnector};
use self::tokio_core::reactor::Core;
use std::convert::From;
use std::io::{Cursor, Read};
use std::io;
use sequoia_core::{Context, NetworkPolicy};
use openpgp::tpk::{self, TPK};
use openpgp::types::KeyId;
use openpgp::{Message, armor};
define_encode_set! {
/// Encoding used for submitting keys.
///
/// The SKS keyserver as of version 1.1.6 is a bit picky with
/// respect to the encoding.
pub KEYSERVER_ENCODE_SET = [DEFAULT_ENCODE_SET] | {'-', '+', '/' }
}
/// For accessing keyservers using HKP.
pub struct KeyServer {
core: Core,
client: Box<AClient>,
uri: Uri,
}
const DNS_WORKER: usize = 4;
impl KeyServer {
/// Returns a handle for the given URI.
pub fn new(ctx: &Context, uri: &str) -> Result<Self> {
let core = Core::new()?;
let uri: Uri = uri.parse()?;
let client: Box<AClient> = match uri.scheme() {
Some("hkp") => Box::new(Client::new(&core.handle())),
Some("hkps") => {
Box::new(Client::configure()
.connector(HttpsConnector::new(DNS_WORKER,
&core.handle())?)
.build(&core.handle()))
},
_ => return Err(Error::MalformedUri),
};
Self::make(ctx, core, client, uri)
}
/// Returns a handle for the given URI.
///
/// `cert` is used to authenticate the server.
pub fn with_cert(ctx: &Context, uri: &str, cert: Certificate) -> Result<Self> {
let core = Core::new()?;
let uri: Uri = uri.parse()?;
let client: Box<AClient> = {
let mut ssl = TlsConnector::builder()?;
ssl.add_root_certificate(cert)?;
let ssl = ssl.build()?;
let mut http = HttpConnector::new(DNS_WORKER, &core.handle());
http.enforce_http(false);
Box::new(Client::configure()
.connector(HttpsConnector::from((http, ssl)))
.build(&core.handle()))
};
Self::make(ctx, core, client, uri)
}
/// Returns a handle for the SKS keyserver pool.
///
/// The pool `hkps://hkps.pool.sks-keyservers.net` provides HKP
/// services over https. It is authenticated using a certificate
/// included in this library. It is a good default choice.
pub fn sks_pool(ctx: &Context) -> Result<Self> {
let uri = "hkps://hkps.pool.sks-keyservers.net";
let cert = Certificate::from_der(
include_bytes!("sks-keyservers.netCA.der")).unwrap();
Self::with_cert(ctx, uri, cert)
}
/// Common code for the above functions.
fn make(ctx: &Context, core: Core, client: Box<AClient>, uri: Uri) -> Result<Self> {
let s = uri.scheme().ok_or(Error::MalformedUri)?;
match s {
"hkp" => ctx.network_policy().assert(NetworkPolicy::Insecure),
"hkps" => ctx.network_policy().assert(NetworkPolicy::Encrypted),
_ => unreachable!()
}?;
let uri =
format!("{}://{}:{}",
match s {"hkp" => "http", "hkps" => "https", _ => unreachable!()},
uri.host().ok_or(Error::MalformedUri)?,
match s {
"hkp" => uri.port().or(Some(11371)),
"hkps" => uri.port().or(Some(443)),
_ => unreachable!(),
}.unwrap()).parse()?;
Ok(KeyServer{core: core, client: client, uri: uri})
}
/// Retrieves the key with the given `keyid`.
pub fn get(&mut self, keyid: &KeyId) -> Result<TPK> {
let uri = format!("{}/pks/lookup?op=get&options=mr&search=0x{}",
self.uri, keyid.as_hex()).parse()?;
let result = self.core.run(
self.client.do_get(uri).and_then(|res| {
let status = res.status();
res.body().concat2().and_then(move |body| Ok((status, body)))
}));
let key: Result<::std::vec::Vec<u8>> = match result {
Ok((status, body)) =>
match status {
StatusCode::Ok => {
let mut c = Cursor::new(body.as_ref());
let mut r = armor::Reader::new(&mut c, armor::Kind::PublicKey);
let mut key = Vec::new();
r.read_to_end(&mut key)?;
Ok(key)
},
StatusCode::NotFound => Err(Error::NotFound),
n => Err(Error::from(n)),
}
Err(e) => Err(Error::HyperError(e)),
|