tor_rtcompat/impls/
native_tls.rs

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1//! Implementation for using `native_tls`
2
3use crate::traits::{CertifiedConn, StreamOps, TlsConnector, TlsProvider};
4
5use async_trait::async_trait;
6use futures::{AsyncRead, AsyncWrite};
7use native_tls_crate as native_tls;
8use std::io::{Error as IoError, Result as IoResult};
9
10/// A [`TlsProvider`] that uses `native_tls`.
11///
12/// It supports wrapping any reasonable stream type that implements `AsyncRead` + `AsyncWrite`.
13#[cfg_attr(
14    docsrs,
15    doc(cfg(all(feature = "native-tls", any(feature = "tokio", feature = "async-std"))))
16)]
17#[derive(Default, Clone)]
18#[non_exhaustive]
19pub struct NativeTlsProvider {}
20
21impl<S> CertifiedConn for async_native_tls::TlsStream<S>
22where
23    S: AsyncRead + AsyncWrite + Unpin,
24{
25    fn peer_certificate(&self) -> IoResult<Option<Vec<u8>>> {
26        let cert = self.peer_certificate();
27        match cert {
28            Ok(Some(c)) => {
29                let der = c.to_der().map_err(IoError::other)?;
30                Ok(Some(der))
31            }
32            Ok(None) => Ok(None),
33            Err(e) => Err(IoError::other(e)),
34        }
35    }
36
37    fn export_keying_material(
38        &self,
39        _len: usize,
40        _label: &[u8],
41        _context: Option<&[u8]>,
42    ) -> IoResult<Vec<u8>> {
43        Err(std::io::Error::new(
44            std::io::ErrorKind::Unsupported,
45            tor_error::bad_api_usage!("native-tls does not support exporting keying material"),
46        ))
47    }
48}
49
50impl<S: AsyncRead + AsyncWrite + StreamOps + Unpin> StreamOps for async_native_tls::TlsStream<S> {
51    fn set_tcp_notsent_lowat(&self, notsent_lowat: u32) -> IoResult<()> {
52        self.get_ref().set_tcp_notsent_lowat(notsent_lowat)
53    }
54
55    fn new_handle(&self) -> Box<dyn StreamOps + Send + Unpin> {
56        self.get_ref().new_handle()
57    }
58}
59
60/// An implementation of [`TlsConnector`] built with `native_tls`.
61pub struct NativeTlsConnector<S> {
62    /// The inner connector object.
63    connector: async_native_tls::TlsConnector,
64    /// Phantom data to ensure proper variance.
65    _phantom: std::marker::PhantomData<fn(S) -> S>,
66}
67
68#[async_trait]
69impl<S> TlsConnector<S> for NativeTlsConnector<S>
70where
71    S: AsyncRead + AsyncWrite + StreamOps + Unpin + Send + 'static,
72{
73    type Conn = async_native_tls::TlsStream<S>;
74
75    async fn negotiate_unvalidated(&self, stream: S, sni_hostname: &str) -> IoResult<Self::Conn> {
76        let conn = self
77            .connector
78            .connect(sni_hostname, stream)
79            .await
80            .map_err(IoError::other)?;
81        Ok(conn)
82    }
83}
84
85impl<S> TlsProvider<S> for NativeTlsProvider
86where
87    S: AsyncRead + AsyncWrite + StreamOps + Unpin + Send + 'static,
88{
89    type Connector = NativeTlsConnector<S>;
90
91    type TlsStream = async_native_tls::TlsStream<S>;
92
93    fn tls_connector(&self) -> Self::Connector {
94        let mut builder = native_tls::TlsConnector::builder();
95        // These function names are scary, but they just mean that we
96        // aren't checking whether the signer of this cert
97        // participates in the web PKI, and we aren't checking the
98        // hostname in the cert.
99        builder
100            .danger_accept_invalid_certs(true)
101            .danger_accept_invalid_hostnames(true);
102
103        // We don't participate in the web PKI, so there is no reason for us to load the standard
104        // list of CAs and CRLs. This can save us an megabyte or two.
105        builder.disable_built_in_roots(true);
106
107        let connector = builder.into();
108
109        NativeTlsConnector {
110            connector,
111            _phantom: std::marker::PhantomData,
112        }
113    }
114
115    fn supports_keying_material_export(&self) -> bool {
116        false
117    }
118}
tor_rtcompat/impls/native_tls.rs

tor_rtcompat/impls/
native_tls.rs
