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ada33e98f5
Point users at the actual guide, and also explain about LD_LIBRARY_PATH Reviewed-by: Hugo Landau <hlandau@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/22505)
81 lines
3.7 KiB
Markdown
81 lines
3.7 KiB
Markdown
Using OpenSSL with QUIC
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=======================
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From OpenSSL 3.2, OpenSSL features support for making QUIC connections as a
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client.
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Users interested in using the new QUIC functionality are encouraged to look at
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some of the following resources:
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- The new [OpenSSL Guide], which provides introductory guides on the use of TLS,
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QUIC, and other OpenSSL functionality.
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- The [OpenSSL Guide] incorporates various code samples. The complete source
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for these can be [found in the source tree under `demos/guide`](./demos/guide/).
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- The [openssl-quic(7) manual page], which provides a basic reference overview
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of QUIC functionality and how use of QUIC differs from use of TLS with regard
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to our API.
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- The [Demo-Driven Design (DDD)][DDD] demos, which demonstrate the use of QUIC
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using simple examples. These can be [found in the source tree under
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`doc/designs/ddd`].
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- The [demo found in `demos/http3`], which provides an HTTP/3 client example
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using the nghttp3 HTTP/3 library.
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FAQ
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---
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### Why would I want to use QUIC, and what functionality does QUIC offer relative to TLS or DTLS?
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QUIC is a state-of-the-art secure transport protocol carried over UDP. It can
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serve many of the use cases of SSL/TLS as well as those of DTLS.
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QUIC delivers a number of advantages such as support for multiple streams of
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communication; it is the basis for HTTP/3 [RFC 9114]; fast connection
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initiation; and connection migration (enabling a connection to survive IP
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address changes). For a more complete description of what QUIC is and its
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advantages see the [QUIC Introduction] in the [OpenSSL Guide].
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For a comprehensive overview of OpenSSL's QUIC implementation, see the
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[openssl-quic(7) manual page].
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### How can I use HTTP/3 with OpenSSL?
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There are many HTTP/3 implementations in C available. The use of one such HTTP/3
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library with OpenSSL QUIC is demonstrated via the [demo found in `demos/http3`].
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### How can I use OpenSSL QUIC in my own application for a different protocol?
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The [OpenSSL Guide] provides introductory examples for how to make use of
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OpenSSL QUIC.
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The [openssl-quic(7) manual page] and the [Demo-Driven Design (DDD)][DDD] demos
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may also be helpful to illustrate the changes needed if you are trying to adapt
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an existing application.
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### How can I test QUIC using `openssl s_client`?
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There is basic support for single-stream QUIC using `openssl s_client`:
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```shell
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$ openssl s_client -quic -alpn myalpn -connect host:port
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```
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In the above example replace `host` with the hostname of the server (e.g.
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`www.example.com`) and `port` with the port for the server (e.g. `443`). Replace
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`myalpn` with the Application Layer Protocol to use (e.g.`h3` represents
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HTTP/3). IANA maintains a standard list of [ALPN ids] that can be used.
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This example connects to a QUIC server and opens a single bidirectional stream.
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Data can be passed via stdin/stdout as usual. This allows test usage of QUIC
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using simple TCP/TLS-like usage. Note that OpenSSL has no direct support for
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HTTP/3 so connecting to an HTTP/3 server should be possible but sending an
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HTTP/3 request or receiving any response data is not.
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[openssl-quic(7) manual page]: https://www.openssl.org/docs/manmaster/man7/openssl-quic.html
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[OpenSSL Guide]: https://www.openssl.org/docs/manmaster/man7/ossl-guide-introduction.html
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[DDD]: https://github.com/openssl/openssl/tree/master/doc/designs/ddd
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[found in the source tree under `doc/designs/ddd`]: ./doc/designs/ddd/
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[demo found in `demos/http3`]: ./demos/http3/
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[QUIC Introduction]: https://www.openssl.org/docs/manmaster/man7/ossl-guide-quic-introduction.html
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[RFC 9114]: https://tools.ietf.org/html/rfc9114
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[ALPN ids]: https://www.iana.org/assignments/tls-extensiontype-values/tls-extensiontype-values.xhtml#alpn-protocol-ids
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