[Help-gnutls] GnuTLS 2.8.2
Simon Josefsson
simon at josefsson.org
Mon Aug 10 15:43:44 CEST 2009
We are proud to announce a new stable GnuTLS release: Version 2.8.2.
GnuTLS is a modern C library that implements the standard network
security protocol Transport Layer Security (TLS), for use by network
applications. GnuTLS is developed for GNU/Linux, but works on many
Unix-like systems and comes with a binary installer for Windows.
The GnuTLS library is distributed under the terms of the GNU Lesser
General Public License version 2.1 (or later). The "extra" GnuTLS
library (which contains TLS/IA support, LZO compression and Libgcrypt
FIPS-mode handler), the OpenSSL compatibility library, the self tests
and the command line tools are all distributed under the GNU General
Public License version 3.0 (or later). The manual is distributed
under the GNU Free Documentation License version 1.3 (or later).
The project page of the library is available at:
http://www.gnu.org/software/gnutls/
What's New
==========
** libgnutls: Fix problem with NUL bytes in X.509 CN and SAN fields.
By using a NUL byte in CN/SAN fields, it was possible to fool GnuTLS
into 1) not printing the entire CN/SAN field value when printing a
certificate and 2) cause incorrect positive matches when matching a
hostname against a certificate. Some CAs apparently have poor
checking of CN/SAN values and issue these (arguable invalid)
certificates. Combined, this can be used by attackers to become a
MITM on server-authenticated TLS sessions. The problem is mitigated
since attackers needs to get one certificate per site they want to
attack, and the attacker reveals his tracks by applying for a
certificate at the CA. It does not apply to client authenticated TLS
sessions. Research presented independently by Dan Kaminsky and Moxie
Marlinspike at BlackHat09. Thanks to Tomas Hoger <thoger at redhat.com>
for providing one part of the patch. [GNUTLS-SA-2009-4].
** libgnutls: Fix return value of gnutls_certificate_client_get_request_status.
Before it always returned false. Reported by Peter Hendrickson
<pdh at wiredyne.com> in
<http://thread.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/3668>.
** libgnutls: Fix off-by-one size computation error in unknown DN printing.
The error resulted in truncated strings when printing unknown OIDs in
X.509 certificate DNs. Reported by Tim Kosse
<tim.kosse at filezilla-project.org> in
<http://thread.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/3651>.
** libgnutls: Return correct bit lengths of some MPIs.
gnutls_dh_get_prime_bits, gnutls_rsa_export_get_modulus_bits, and
gnutls_dh_get_peers_public_bits. Before the reported value was
overestimated. Reported by Peter Hendrickson <pdh at wiredyne.com> in
<http://thread.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/3607>.
** libgnutls: Avoid internal error when invoked after GNUTLS_E_AGAIN.
Report and patch by Tim Kosse <tim.kosse at filezilla-project.org> in
<http://permalink.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/3671>
and
<http://permalink.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/3670>.
** libgnutls: Relax checking of required libtasn1/libgcrypt versions.
Before we required that the runtime library used the same (or more
recent) libgcrypt/libtasn1 as it was compiled with. Now we just check
that the runtime usage is above the minimum required. Reported by
Marco d'Itri <md at linux.it> via Andreas Metzler
<ametzler at downhill.at.eu.org> in <http://bugs.debian.org/540449>.
** minitasn1: Internal copy updated to libtasn1 v2.3.
** tests: Fix failure in "chainverify" because a certificate have expired.
** API and ABI modifications:
No changes since last version.
Getting the Software
====================
GnuTLS may be downloaded from one of the mirror sites or direct from
<ftp://ftp.gnu.org/gnu/gnutls/>. The list of mirrors can be found at
<http://www.gnu.org/software/gnutls/download.html>.
Here are the BZIP2 compressed sources (6.0MB):
ftp://ftp.gnu.org/gnu/gnutls/gnutls-2.8.2.tar.bz2
http://ftp.gnu.org/gnu/gnutls/gnutls-2.8.2.tar.bz2
Here are OpenPGP detached signatures signed using key 0xB565716F:
ftp://ftp.gnu.org/gnu/gnutls/gnutls-2.8.2.tar.bz2.sig
http://ftp.gnu.org/gnu/gnutls/gnutls-2.8.2.tar.bz2.sig
Note, that we don't distribute gzip compressed tarballs.
In order to check that the version of GnuTLS which you are going to
install is an original and unmodified one, you should verify the OpenPGP
signature. You can use the command
gpg --verify gnutls-2.8.2.tar.bz2.sig
This checks whether the signature file matches the source file. You
should see a message indicating that the signature is good and made by
that signing key. Make sure that you have the right key, either by
checking the fingerprint of that key with other sources or by checking
that the key has been signed by a trustworthy other key. The signing
key can be identified with the following information:
pub 1280R/B565716F 2002-05-05 [expires: 2010-04-21]
Key fingerprint = 0424 D4EE 81A0 E3D1 19C6 F835 EDA2 1E94 B565 716F
uid Simon Josefsson <simon at josefsson.org>
uid Simon Josefsson <jas at extundo.com>
sub 1280R/4D5D40AE 2002-05-05 [expires: 2010-04-21]
The key is available from:
http://josefsson.org/key.txt
dns:b565716f.josefsson.org?TYPE=CERT
Alternatively, after successfully verifying the OpenPGP signature of
this announcement, you could verify that the files match the following
checksum values. The values are for SHA-1 and SHA-224 respectively:
eea59fb972e7d566679645a564a56b58aeffe10b gnutls-2.8.2.tar.bz2
048bfb981a4a88d7040c1951614bd9d06cdd787e2242d6243391775a gnutls-2.8.2.tar.bz2
Documentation
=============
The manual is available online at:
http://www.gnu.org/software/gnutls/documentation.html
In particular the following formats are available:
HTML: http://www.gnu.org/software/gnutls/manual/html_node/index.html
PDF: http://www.gnu.org/software/gnutls/manual/gnutls.pdf
For developers there is a GnuTLS API reference manual formatted using
the GTK-DOC tools:
http://www.gnu.org/software/gnutls/reference/gnutls-gnutls.html
Community
=========
If you need help to use GnuTLS, or want to help others, you are invited
to join our help-gnutls mailing list, see:
http://lists.gnu.org/mailman/listinfo/help-gnutls
If you wish to participate in the development of GnuTLS, you are invited
to join our gnutls-dev mailing list, see:
http://lists.gnu.org/mailman/listinfo/gnutls-devel
Windows installer
=================
GnuTLS has been ported to the Windows operating system, and a binary
installer is available. The installer contains DLLs for application
development, manuals, examples, and source code. The installer includes
libgpg-error v1.7, libgcrypt v1.4.4, libtasn1 v2.3, and GnuTLS v2.8.2.
For more information about GnuTLS for Windows:
http://josefsson.org/gnutls4win/
The Windows binary installer and PGP signature:
http://josefsson.org/gnutls4win/gnutls-2.8.2.exe (15MB)
http://josefsson.org/gnutls4win/gnutls-2.8.2.exe.sig
The checksum values for SHA-1 and SHA-224 are:
18fc15825832606123284dd5d7a77d402bf14101 gnutls-2.8.2.exe
9e9b9e5c9c213743fcb070af5c0b9a552ddd3fb3a241f2e0dbb89fa3 gnutls-2.8.2.exe
A ZIP archive containing the Windows binaries:
http://josefsson.org/gnutls4win/gnutls-2.8.2.zip (5.3MB)
http://josefsson.org/gnutls4win/gnutls-2.8.2.zip.sig
The checksum values for SHA-1 and SHA-224 are:
af492d1c31ef4ecc27724839ce62f5a334731b26 gnutls-2.8.2.zip
ca3306416ad63c22b281c30165c83d94d97b0e7a817303f2ca61d00c gnutls-2.8.2.zip
A Debian mingw32 package is also available:
http://josefsson.org/gnutls4win/mingw32-gnutls_2.8.2-1_all.deb (4.8MB)
The checksum values for SHA-1 and SHA-224 are:
4d591773c387be1409fb000ff1a9eae3c3c19756 mingw32-gnutls_2.8.2-1_all.deb
fb742033dca3ccca3757d798dfa37fb718c2bac082e557bb7dfbfe57 mingw32-gnutls_2.8.2-1_all.deb
Internationalization
====================
The GnuTLS library messages have been translated into Czech, Dutch,
French, German, Malay, Polish, Swedish, and Vietnamese. We welcome the
addition of more translations.
Support
=======
Improving GnuTLS is costly, but you can help! We are looking for
organizations that find GnuTLS useful and wish to contribute back. You
can contribute by reporting bugs, improve the software, or donate money
or equipment.
Commercial support contracts for GnuTLS are available, and they help
finance continued maintenance. Simon Josefsson Datakonsult AB, a
Stockholm based privately held company, is currently funding GnuTLS
maintenance. We are always looking for interesting development
projects. See http://josefsson.org/ for more details.
The GnuTLS service directory is available at:
http://www.gnu.org/software/gnutls/commercial.html
Happy Hacking,
Simon
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