LibreSSL-2.3.0 released PDF Print E-mail
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Written by Michael Felt   
OpenBSD/LibreSSL project has released LibreSSL 2.3.0, which will be arriving in the LibreSSL directory of your local OpenBSD mirror soon. This release is the first snapshot based on the development OpenBSD 5.9 branch. As such, it is likely to change more compared to the stable 2.2.x and 2.1.x branches. The ABI/API for the LibreSSL 2.3.x series will be declared stable around March 2016. See for more details.

As in previous releases, LibreSSL 2.3.0 removes more unsafe or obsolete algorithms and protocols. To help in the transition, we have begun tracking some of the more common software that needs patches or new releases in order to build properly without these removed features. See for information.

Notable features in this release:

  • SSLv3 is now permanently removed from the tree.
  • The libtls API is changed from the 2.2.x series:
    The tls_read/write functions now work better with external event libraries. See the tls_init man page for examples of using libtls correctly in asynchronous mode.
    Client-side verification is now supported, with the client supplying the certificate to the server.
    Also, when using tls_connect_fds, tls_connect_socket or tls_accept_fds, libtls no longer implicitly closes the passed in sockets. The caller is responsible for closing them in this case.
  • When loading a DSA key from an raw (without DH parameters) ASN.1 serialization, perform some consistency checks on its `p' and `q' values, and return an error if the checks failed.
    Thanks for Georgi Guninski (guninski at guninski dot com) for mentioning the possibility of a weak (non prime) q value and providing a test case.
    See for a longer discussion.
  • Fixed a bug in ECDH_compute_key that can lead to silent truncation of the result key without error. A coding error could cause software to use much shorter keys than intended.
  • Removed support for DTLS_BAD_VER. Pre-DTLSv1 implementations are no longer supported.
  • The engine command and parameters are removed from the openssl(1). Previous releases removed dynamic and builtin engine support already.
  • SHA-0 is removed, which was withdrawn shortly after publication 20 years ago.
  • Added Certplus CA root certificate to the default cert.pem file.
  • New interface OPENSSL_cpu_caps is provided that does not allow software to inadvertently modify cpu capability flags. OPENSSL_ia32cap and OPENSSL_ia32cap_loc are removed.
  • The out_len argument of AEAD changed from ssize_t to size_t.
  • Deduplicated DTLS code, sharing bugfixes and improvements with TLS.
  • Converted 'nc' to use libtls for client and server operations; it is included in the libressl-portable distribution as an example of how to use the libtls library. This is intended to be a simpler and more robust replacement for 'openssl s_client' and 'openssl s_server' for day-to-day operations.

The LibreSSL project continues improvement of the codebase to reflect modern, safe programming practices. We welcome feedback and improvements from the broader community. Thanks to all of the contributors who helped make this release possible. Special thanks to FreeBSD's Bernard Spil and the OpenBSD Ports team, who have been instrumental through the SSLv3 transition.

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