Rustls is a new, modern TLS library written in Rust. It's pronounced 'rustles'. It uses ring for cryptography and libwebpki for certificate verification.
Rustls is currently in development and hence unstable. Here's what I'm working on now.
complete_io) to rustls::Session.rustls::Stream -- to ease use on top
of blocking sockets.dangerous_configuration feature for unsafe features.ResolvesServerCert trait for customising certification
selection.SignatureScheme enum.Lives here: https://docs.rs/rustls/
Rustls is a TLS library that aims to provide a good level of cryptographic security, requires no configuration to achieve that security, and provides no unsafe features or obsolete cryptography.
The following things are broken, obsolete, badly designed, underspecified, dangerous and/or insane. Rustls does not support:
There are plenty of other libraries that provide these features should you need them.
There are two example programs which use mio to do asynchronous IO.
The client example program is named tlsclient. The interface looks like:
```tlsclient Connects to the TLS server at hostname:PORT. The default PORT is 443. By default, this reads a request from stdin (to EOF) before making the connection. --http replaces this with a basic HTTP GET request for /.
If --cafile is not supplied, a built-in set of CA certificates are used from the webpki-roots crate.
Usage:
tlsclient [options] [--suite SUITE ...] [--proto PROTO ...]
Options: -p, --port PORT Connect to PORT [default: 443]. --http Send a basic HTTP GET request for /. --cafile CAFILE Read root certificates from CAFILE. --auth-key KEY Read client authentication key from KEY. --auth-certs CERTS Read client authentication certificates from CERTS. CERTS must match up with KEY. --suite SUITE Disable default cipher suite list, and use SUITE instead. May be used multiple times. --proto PROTOCOL Send ALPN extension containing PROTOCOL. May be used multiple times to offer serveral protocols. --cache CACHE Save session cache to file CACHE. --no-tickets Disable session ticket support. --insecure Disable certificate verification. --verbose Emit log output. --mtu MTU Limit outgoing messages to MTU bytes. --version, -v Show tool version. --help, -h Show this screen. ```
Some sample runs:
$ ./tlsclient --http mozilla-modern.badssl.com
HTTP/1.1 200 OK
Server: nginx/1.6.2 (Ubuntu)
Date: Wed, 01 Jun 2016 18:44:00 GMT
Content-Type: text/html
Content-Length: 644
(...)
or
$ ./target/debug/examples/tlsclient --http expired.badssl.com
TLS error: WebPKIError(CertExpired)
Connection closed
The server example program is named tlsserver. The interface looks like:
```tlsserver Runs a TLS server on :PORT. The default PORT is 443.
`echo' mode means the server echoes received data on each connection.
`http' mode means the server blindly sends a HTTP response on each connection.
`forward' means the server forwards plaintext to a connection made to localhost:fport.
--certs' names the full certificate chain,--key' provides the
RSA private key.
Usage:
tlsserver --certs CERTFILE --key KEYFILE [--suite SUITE ...] [--proto PROTO ...] [options] echo
tlsserver --certs CERTFILE --key KEYFILE [--suite SUITE ...] [--proto PROTO ...] [options] http
tlsserver --certs CERTFILE --key KEYFILE [--suite SUITE ...] [--proto PROTO ...] [options] forward
Options: -p, --port PORT Listen on PORT [default: 443]. --certs CERTFILE Read server certificates from CERTFILE. This should contain PEM-format certificates in the right order (the first certificate should certify KEYFILE, the last should be a root CA). --key KEYFILE Read private key from KEYFILE. This should be a RSA private key or PKCS8-encoded private key, in PEM format. --ocsp OCSPFILE Read DER-encoded OCSP response from OCSPFILE and staple to certificate. Optional. --auth CERTFILE Enable client authentication, and accept certificates signed by those roots provided in CERTFILE. --require-auth Send a fatal alert if the client does not complete client authentication. --resumption Support session resumption. --tickets Support tickets. --suite SUITE Disable default cipher suite list, and use SUITE instead. May be used multiple times. --proto PROTOCOL Negotiate PROTOCOL using ALPN. May be used multiple times. --verbose Emit log output. --version, -v Show tool version. --help, -h Show this screen. ```
Here's a sample run; we start a TLS echo server, then connect to it with openssl and tlsclient:
$ ./tlsserver --certs test-ca/rsa/end.fullchain --key test-ca/rsa/end.rsa -p 8443 echo &
$ echo hello world | openssl s_client -ign_eof -quiet -connect localhost:8443
depth=2 CN = ponytown RSA CA
verify error:num=19:self signed certificate in certificate chain
hello world
^C
$ echo hello world | ./tlsclient --cafile test-ca/rsa/ca.cert -p 8443 localhost
hello world
^C
Rustls is distributed under the following three licenses:
These are included as LICENSE-APACHE, LICENSE-MIT and LICENSE-ISC respectively. You may use this software under the terms of any of these licenses, at your option.