We are proud to announce a new stable GnuTLS release: Version 2.10.0. 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 ========== Version 2.10.0 is the first stable release on the 2.10.x branch and is the result of over 12 months of work on the experimental 2.9.x branch. The GnuTLS 2.10.x branch replaces the GnuTLS 2.8.x branch as the supported stable branch, although we will continue to support GnuTLS 2.8.x for some time. ** libgnutls: Added Steve Dispensa's patch for safe renegotiation (RFC 5746) Solves the issue discussed in: <http://www.ietf.org/mail-archive/web/tls/current/msg03928.html> and <http://www.ietf.org/mail-archive/web/tls/current/msg03948.html>. Note that to allow connecting to unpatched servers the full protection is only enabled if the priority string %SAFE_RENEGOTIATION is specified. You can check whether protection is in place by querying gnutls_safe_renegotiation_status(). New error codes GNUTLS_E_SAFE_RENEGOTIATION_FAILED and GNUTLS_E_UNSAFE_RENEGOTIATION_DENIED added. ** libgnutls: Time verification extended to trusted certificate list. Unless new constant GNUTLS_VERIFY_DISABLE_TRUSTED_TIME_CHECKS flag is specified. ** certtool: Display postalCode and Name X.509 DN attributes correctly. Based on patch by Pavan Konjarla. Adds new constant GNUTLS_OID_X520_POSTALCODE and GNUTLS_OID_X520_NAME. ** libgnutls: When checking openpgp self signature also check the signatures ** of all subkeys. Ilari Liusvaara noticed and reported the issue and provided test vectors as well. ** libgnutls: Added cryptodev support (/dev/crypto). Tested with http://home.gna.org/cryptodev-linux/. Added benchmark utility for AES. Adds new error codes GNUTLS_E_CRYPTODEV_IOCTL_ERROR and GNUTLS_E_CRYPTODEV_DEVICE_ERROR. ** libgnutls: Exported API to access encryption and hash algorithms. The new API functions are gnutls_cipher_decrypt, gnutls_cipher_deinit, gnutls_cipher_encrypt, gnutls_cipher_get_block_size, gnutls_cipher_init, gnutls_hash, gnutls_hash_deinit, gnutls_hash_fast, gnutls_hash_get_len, gnutls_hash_init, gnutls_hash_output, gnutls_hmac, gnutls_hmac_deinit, gnutls_hmac_fast, gnutls_hmac_get_len, gnutls_hmac_init, gnutls_hmac_output. New API constants are GNUTLS_MAC_SHA224 and GNUTLS_DIG_SHA224. ** libgnutls: Added gnutls_certificate_set_verify_function() to allow verification of certificate upon receipt rather than waiting until the end of the handshake. ** libgnutls: Don't send alerts during handshake. Instead new error code GNUTLS_E_UNKNOWN_SRP_USERNAME is added. ** certtool: Corrected two issues that affected certificate request generation. (1) Null padding is added on integers (found thanks to Wilankar Trupti), (2) In optional SignatureAlgorithm parameters field for DSA keys the DSA parameters were added. Those were rejected by Verisign. Gnutls no longer adds those parameters there since other implementations don't do either and having them does not seem to offer anything (anyway you need the signer's certificate to verify thus public key will be available). Found thanks to Boyan Kasarov. This however has the side-effect that public key IDs shown by certtool are now different than previous gnutls releases. (3) the option --pgp-certificate-info will verify self signatures ** certtool: Allow exporting of Certificate requests on DER format. ** certtool: New option --no-crq-extensions to avoid extensions in CSRs. ** gnutls-cli: Handle reading binary data from server. Reported by and tiny patch from Vitaly Mayatskikh <v.mayats...@gmail.com> in <http://thread.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/4096>. ** minitasn1: Upgraded to libtasn1 version 2.6. ** doc: The GTK-DOC manual is significantly improved. ** doc: a PDF version of the API reference manual (GTK-DOC) is now built. ** doc: Terms 'GNUTLS' and 'GNU TLS' were changed to 'GnuTLS' for consistency. ** libgnutls: Cleanups and several bug fixes. Found by Steve Grubb and Tomas Mraz. ** Link libgcrypt explicitly to certtool, gnutls-cli, gnutls-serv. ** Fix --disable-valgrind-tests. Reported by Ingmar Vanhassel in <https://savannah.gnu.org/support/?107029>. ** libgnutls: Fix for memory leaks on interrupted handshake. Reported by Tang Tong. ** libgnutls: Addition of support for TLS 1.2 signature algorithms ** extension and certificate verify field. This requires changes for TLS 1.2 servers and clients that use callbacks for certificate retrieval. They are now required to check with gnutls_sign_algorithm_get_requested() whether the certificate they send complies with the peer's preferences in signature algorithms. ** libgnutls: In server side when resuming a session do not overwrite the ** initial session data with the resumed session data. ** libgnutls: Added support for AES-128, AES-192 and AES-256 in PKCS #8 ** encryption. This affects also PKCS #12 encoded files. This adds the following new enums: GNUTLS_CIPHER_AES_192_CBC, GNUTLS_PKCS_USE_PBES2_AES_128, GNUTLS_PKCS_USE_PBES2_AES_192, GNUTLS_PKCS_USE_PBES2_AES_256. ** libgnutls: Fix PKCS#12 encoding. The error you would get was "The OID is not supported.". Problem introduced for the v2.8.x branch in 2.7.6. ** certtool: Added the --pkcs-cipher option. To explicitely specify the encryption algorithm to use. ** tests: Added "pkcs12_encode" self-test to check PKCS#12 functions. ** tests: Fix time bomb in chainverify self-test. Reported by Andreas Metzler <ametz...@downhill.at.eu.org> in <http://thread.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/3925>. ** tests: Fix expired cert in chainverify self-test. ** libgnutls: TLS 1.2 server mode fixes. Now interoperates against Opera. Contributed by Daiki Ueno. ** libgnutlsxx: Fix link problems. Tiny patch from Boyan Kasarov <bkasa...@gmail.com>. ** guile: Compatibility with guile 2.x. By Ludovic Courtes <ludovic.cour...@laas.fr>. ** libgnutls: Enable Camellia ciphers by default. ** libgnutls: Add new functions to extract X.509 Issuer Alternative Names. The new functions are gnutls_x509_crt_get_issuer_alt_name2, gnutls_x509_crt_get_issuer_alt_name, and gnutls_x509_crt_get_issuer_alt_othername_oid. Contributed by Brad Hards <br...@frogmouth.net>. ** libgnutls: Client-side TLS 1.2 and SHA-256 ciphersuites now works. The new supported ciphersuites are AES-128/256 in CBC mode with ANON-DH/RSA/DHE-DSS/DHE-RSA. Contributed by Daiki Ueno. Further, SHA-256 is now the preferred default MAC (however it is only used with TLS 1.2). ** libgnutls: Make OpenPGP hostname checking work again. The patch to resolve the X.509 CN/SAN issue accidentally broken OpenPGP hostname comparison. ** libgnutls: When printing X.509 certificates, handle XMPP SANs better. Reported by Howard Chu <h...@symas.com> in <https://savannah.gnu.org/support/?106975>. ** Fix use of deprecated types internally. Use of deprecated types in GnuTLS from now on will lead to a compile error, to prevent this from happening again. ** libgnutls: Support for TLS tickets was contributed by Daiki Ueno. The new APIs are gnutls_session_ticket_enable_client, gnutls_session_ticket_enable_server, and gnutls_session_ticket_key_generate. ** gnutls-cli, gnutls-serv: New parameter --noticket to disable TLS tickets. ** 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 <tho...@redhat.com> for providing one part of the patch. [GNUTLS-SA-2009-4] [CVE-2009-2730]. ** libgnutls: Fix rare failure in gnutls_x509_crt_import. The function may fail incorrectly when an earlier certificate was imported to the same gnutls_x509_crt_t structure. ** libgnutls: Fix return value of gnutls_certificate_client_get_request_status. Before it always returned false. Reported by Peter Hendrickson <p...@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.ko...@filezilla-project.org> in <http://thread.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/3651>. ** libgnutls: Fix PKCS#12 decryption from password. The encryption key derived from the password was incorrect for (on average) 1 in every 128 input for random inputs. Reported by "Kukosa, Tomas" <tomas.kuk...@siemens-enterprise.com> in <http://permalink.gmane.org/gmane.network.gnutls.general/1663>. ** 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 <p...@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.ko...@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 <m...@linux.it> via Andreas Metzler <ametz...@downhill.at.eu.org> in <http://bugs.debian.org/540449>. ** tests: Added new self-test pkcs12_s2k_pem to detect MPI bit length error. ** tests: Improved test vectors in self-test pkcs12_s2k. ** tests: Added new self-test dn2 to detect off-by-one size error. ** tests: Fix failure in "chainverify" because a certificate have expired. ** libgnutls: Fix crash in gnutls_global_init after earlier init/deinit cycle. Forwarded by Martin von Gagern <martin.vgag...@gmx.net> from <http://bugs.gentoo.org/272388>. ** Reduce stack usage for some CRQ functions. ** Doc fixes for CRQ functions. TLS Renegotiation Attack ======================== Some application protocols and implementations uses the TLS renegotiation feature in a manner that enables attackers to insert content of his choice in the beginning of a TLS session. One easy to understand vulnerability is HTTPS when servers request client certificates optionally for certain parts of a web site. The attack works by having the attacker simulate a client and connect to a server, with server-only authentication, and send some data intended to cause harm. When the proper client attempts to contact the server, the attacker hijacks that connection and uses the TLS renegotiation feature with the server and splices in the client connection to the already established connection between the attacker and server. The attacker will not be able to read the data exchanged between the client and the server. However, the server will (incorrectly) assume that the data sent by the attacker was sent by the now authenticated client. The result is a prefix plain-text injection attack. The above is just one example. Other vulnerabilities exists that do not rely on the TLS renegotiation to change the client's authenticated status (either TLS or application layer). While fixing these application protocols and implementations would be one natural reaction, an extension to TLS has been designed that cryptographically binds together any renegotiated handshakes with the initial negotiation. When the extension is used, the attack is detected and the session can be terminated. The extension is specified in RFC5746. GnuTLS supports the safe renegotiation extension. The default behavior is as follows. Clients will attempt to negotiate the safe renegotiation extension when talking to servers. Servers will accept the extension when presented by clients. Clients and servers will permit an initial handshake to complete even when the other side does not support the safe renegotiation extension. Clients and servers will refuse renegotiation attempts when the extension has not been negotiated. Note that permitting clients to connect to servers even when the safe renegotiation extension is not negotiated open up for some attacks. Changing this default behaviour would prevent interoperability against the majority of deployed servers out there. We will reconsider this default behaviour in the future when more servers have been upgraded. Note that it is easy to configure clients to always require the safe renegotiation extension from servers (see below on the `%SAFE_RENEGOTIATION' priority string). To modify the default behaviour, we have introduced some new priority strings. The priority strings can be used by applications (see gnutls_priority_set) and end users (e.g., `--priority' parameter to `gnutls-cli' and `gnutls-serv'). The `%UNSAFE_RENEGOTIATION' priority string permits (re-)handshakes even when the safe renegotiation extension was not negotiated. The default behavior is `%PARTIAL_RENEGOTIATION' that will prevent renegotiation with clients and servers not supporting the extension. This is secure for servers but leaves clients vulnerable to some attacks, but this is a tradeoff between security and compatibility with old servers. The `%SAFE_RENEGOTIATION' priority string makes clients and servers require the extension for every handshake. The latter is the most secure option for clients, at the cost of not being able to connect to legacy servers. Servers will also deny clients that do not support the extension from connecting. It is possible to disable use of the extension completely, in both clients and servers, by using the `%DISABLE_SAFE_RENEGOTIATION' priority string however we strongly recommend you to only do this for debugging and test purposes. The default values if the flags above are not specified are: `Server:' %PARTIAL_RENEGOTIATION `Client:' %PARTIAL_RENEGOTIATION For applications we have introduced a new API related to safe renegotiation. The gnutls_safe_renegotiation_status function is used to check if the extension has been negotiated on a session, and can be used both by clients and servers. Call to application authors =========================== Please use the priority string interface, and make it possible for users to supply a priority string! Several parts of GnuTLS, including the new safe renegotiation behaviour, can be configured through priority strings. However, if the application do not publish this interface to users, it will not be possible to configure GnuTLS the way a user wants. The new defaults for GnuTLS with regard to the safe renegotiation bug is to be insecure by default. This is something we reluctantly and after carefuly consideration decided to do, for interoperability reasons. We'd like to close this security gap as soon as possible, hopefully even for the GnuTLS 2.12.x branch. For this transition to be as smooth as possible, users of GnuTLS applications needs to be able to provide a priority string when a TLS session is initialized. Preferrably it should be possible to do on a domain name or IP basis, to only modify the defaults for a particular server and not generally. Once the GnuTLS defaults have changed to be secure by default, users may want to be able to provide a %PARTIAL_RENEGOTIATION or even an %UNSAFE_RENEGOTIATION priority string, to be able to talk with certain clients or servers. This will not be possible unless you, as application author, export this ability to your users. Technically, you would replace a call like this: gnutls_set_default_priority (session) with a call like this: gnutls_priority_set_direct (session, string, NULL); where 'string' is a character string read from your configuration files, and the default should be 'NORMAL'. It is fine for string to be NULL if you didn't read any configuration from the user, then 'NORMAL' will be used. For more information see: http://www.gnu.org/software/gnutls/manual/html_node/Core-functions.html#gnutls_005fpriority_005finit API/ABI changes in GnuTLS 2.10 ============================== No offically supported interfaces have been modified or removed. The library should be completely backwards compatible on both the source and binary level. The following symbols have been added to the library: gnutls_certificate_set_verify_function: ADDED. gnutls_cipher_decrypt: ADDED. gnutls_cipher_deinit: ADDED. gnutls_cipher_encrypt: ADDED. gnutls_cipher_get_block_size: ADDED. gnutls_cipher_init: ADDED. gnutls_hash: ADDED. gnutls_hash_deinit: ADDED. gnutls_hash_fast: ADDED. gnutls_hash_get_len: ADDED. gnutls_hash_init: ADDED. gnutls_hash_output: ADDED. gnutls_hmac: ADDED. gnutls_hmac_deinit: ADDED. gnutls_hmac_fast: ADDED. gnutls_hmac_get_len: ADDED. gnutls_hmac_init: ADDED. gnutls_hmac_output: ADDED. gnutls_safe_renegotiation_status: ADDED. gnutls_sign_algorithm_get_requested: ADDED. gnutls_x509_crt_get_issuer_alt_name2: ADDED. gnutls_x509_crt_get_issuer_alt_name: ADDED. gnutls_x509_crt_get_issuer_alt_othername_oid: ADDED. gnutls_session_ticket_key_generate: ADDED. gnutls_session_ticket_enable_client: ADDED. gnutls_session_ticket_enable_server: ADDED. In addition to the functions above, the following non-function definitions have been added to the header files: GNUTLS_DIG_SHA224: ADDED. GNUTLS_E_CRYPTODEV_DEVICE_ERROR: ADDED. GNUTLS_E_CRYPTODEV_IOCTL_ERROR: ADDED. GNUTLS_E_SAFE_RENEGOTIATION_FAILED: ADDED. GNUTLS_E_UNKNOWN_SRP_USERNAME: ADDED. GNUTLS_E_UNSAFE_RENEGOTIATION_DENIED: ADDED. GNUTLS_MAC_SHA224: ADDED. GNUTLS_OID_X520_NAME: ADDED. GNUTLS_OID_X520_POSTALCODE: ADDED. GNUTLS_VERIFY_DISABLE_TRUSTED_TIME_CHECKS: ADDED. GNUTLS_VERSION_MAX: ADDED. GNUTLS_CIPHER_AES_192_CBC: ADDED to gnutls/gnutls.h. GNUTLS_PKCS_USE_PBES2_AES_128: ADDED to gnutls/x509.h. GNUTLS_PKCS_USE_PBES2_AES_192: ADDED to gnutls/x509.h. GNUTLS_PKCS_USE_PBES2_AES_256: ADDED to gnutls/x509.h. GNUTLS_BAG_SECRET: ADDED to gnutls/pkcs12.h. GNUTLS_DIG_UNKNOWN: ADDED to gnutls/gnutls.h. 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 (7.2MB): ftp://ftp.gnu.org/gnu/gnutls/gnutls-2.10.0.tar.bz2 http://ftp.gnu.org/gnu/gnutls/gnutls-2.10.0.tar.bz2 Here are OpenPGP detached signatures signed using key 0xB565716F: ftp://ftp.gnu.org/gnu/gnutls/gnutls-2.10.0.tar.bz2.sig http://ftp.gnu.org/gnu/gnutls/gnutls-2.10.0.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-2.10.0.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: 2011-03-30] Key fingerprint = 0424 D4EE 81A0 E3D1 19C6 F835 EDA2 1E94 B565 716F uid Simon Josefsson <j...@extundo.com> uid Simon Josefsson <si...@josefsson.org> sub 1280R/4D5D40AE 2002-05-05 [expires: 2011-03-30] 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: 16c94a1262f8ea3c4dd34eec495bd57203bbcd3a gnutls-2.10.0.tar.bz2 f97d09916dc87315a245991ce005f658915ca3770f4c48006d28c358 gnutls-2.10.0.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: HTML: http://www.gnu.org/software/gnutls/reference/gnutls-gnutls.html PDF: http://www.gnu.org/software/gnutls/reference/gnutls.pdf 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 contains libgpg-error v1.8, libgcrypt v1.4.5, libtasn1 v2.7, and GnuTLS v2.10.0. For more information about GnuTLS for Windows: http://josefsson.org/gnutls4win/ The Windows binary installer and PGP signature: http://josefsson.org/gnutls4win/gnutls-2.10.0.exe (17MB) http://josefsson.org/gnutls4win/gnutls-2.10.0.exe.sig The checksum values for SHA-1 and SHA-224 are: 5fb951d9819f45fc53ff368c87aea61391c782f1 gnutls-2.10.0.exe ad39fdbdff193c622e72eaf837443d882f7b3876a7c1a911123339cb gnutls-2.10.0.exe A ZIP archive containing the Windows binaries: http://josefsson.org/gnutls4win/gnutls-2.10.0.zip (5.5MB) http://josefsson.org/gnutls4win/gnutls-2.10.0.zip.sig A Debian mingw32 package is also available: http://josefsson.org/gnutls4win/mingw32-gnutls_2.7.10-1_all.deb (5.0MB) The checksum values for SHA-1 and SHA-224 are: 7ffabf34274cfc73c84550aae7efe650df10f77e gnutls-2.10.0.zip a657b3c5a07964a46f214bed5d72f731d85ef5829072d15e3c817fca gnutls-2.10.0.zip 6fd7c6264237f76ba31304d16d2d72a428126267 mingw32-gnutls_2.10.0-1_all.deb 944f8fa4db48efdffd0e03630c86ca275925d5f295fd99614f58ddfd mingw32-gnutls_2.10.0-1_all.deb Internationalization ==================== The GnuTLS library messages have been translated into Czech, Dutch, French, German, Italian, Malay, Polish, Simplified Chinese, 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 Glad midsommar, Simon
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