path: root/lib/ssl/doc/src/notes.xml

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<!DOCTYPE chapter SYSTEM "chapter.dtd">

<chapter>
  <header>
    <copyright>
      <year>1999</year><year>2016</year>
      <holder>Ericsson AB. All Rights Reserved.</holder>
    </copyright>
    <legalnotice>
      Licensed under the Apache License, Version 2.0 (the "License");
      you may not use this file except in compliance with the License.
      You may obtain a copy of the License at
 
          http://www.apache.org/licenses/LICENSE-2.0

      Unless required by applicable law or agreed to in writing, software
      distributed under the License is distributed on an "AS IS" BASIS,
      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      See the License for the specific language governing permissions and
      limitations under the License.

    </legalnotice>

    <title>SSL Release Notes</title>
    <file>notes.xml</file>
  </header>
  <p>This document describes the changes made to the SSL application.</p>


<section><title>SSL 7.3.3</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Correct ssl:prf/5 to use the negotiated cipher suite's
	    prf function in ssl:prf/5 instead of the default prf.</p>
          <p>
	    Own Id: OTP-13546</p>
        </item>
        <item>
          <p>
	    Timeouts may have the value 0, guards have been corrected
	    to allow this</p>
          <p>
	    Own Id: OTP-13635</p>
        </item>
        <item>
          <p>
	    Change of internal handling of hash sign pairs as the
	    used one enforced to much restrictions making some valid
	    combinations unavailable.</p>
          <p>
	    Own Id: OTP-13670</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Create a little randomness in sending of session
	    invalidation messages, to mitigate load when whole table
	    is invalidated.</p>
          <p>
	    Own Id: OTP-13490</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 7.3.2</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Correct cipher suites conversion and gaurd expression.
	    Caused problems with GCM cipher suites and client side
	    option to set signature_algorithms extention values.</p>
          <p>
	    Own Id: OTP-13525</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 7.3.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Corrections to cipher suite handling using the 3 and 4
	    tuple format in addition to commit
	    89d7e21cf4ae988c57c8ef047bfe85127875c70c</p>
          <p>
	    Own Id: OTP-13511</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Make values for the TLS-1.2 signature_algorithms
	    extension configurable</p>
          <p>
	    Own Id: OTP-13261</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 7.3</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Make sure there is only one poller validator at a time
	    for validating the session cache.</p>
          <p>
	    Own Id: OTP-13185</p>
        </item>
        <item>
          <p>
	    A timing related issue could cause ssl to hang,
	    especially happened with newer versions of OpenSSL in
	    combination with ECC ciphers.</p>
          <p>
	    Own Id: OTP-13253</p>
        </item>
        <item>
          <p>
	    Work around a race condition in the TLS distribution
	    start.</p>
          <p>
	    Own Id: OTP-13268</p>
        </item>
        <item>
          <p>
	    Big handshake messages are now correctly fragmented in
	    the TLS record layer.</p>
          <p>
	    Own Id: OTP-13306</p>
        </item>
        <item>
          <p>
	    Improve portability of ECC tests in Crypto and SSL for
	    "exotic" OpenSSL versions.</p>
          <p>
	    Own Id: OTP-13311</p>
        </item>
        <item>
          <p>
	    Certificate extensions marked as critical are ignored
	    when using verify_none</p>
          <p>
	    Own Id: OTP-13377</p>
        </item>
        <item>
          <p>
	    If a certificate doesn't contain a CRL Distribution
	    Points extension, and the relevant CRL is not in the
	    cache, and the <c>crl_check</c> option is not set to
	    <c>best_effort</c> , the revocation check should fail.</p>
          <p>
	    Own Id: OTP-13378</p>
        </item>
        <item>
          <p>
	    Enable TLS distribution over IPv6</p>
          <p>
	    Own Id: OTP-13391</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Improve error reporting for TLS distribution</p>
          <p>
	    Own Id: OTP-13219</p>
        </item>
        <item>
          <p>
	    Include options from connect, listen and accept in
	    <c>connection_information/1,2</c></p>
          <p>
	    Own Id: OTP-13232</p>
        </item>
        <item>
          <p>
	    Allow adding extra options for outgoing TLS distribution
	    connections, as supported for plain TCP connections.</p>
          <p>
	    Own Id: OTP-13285</p>
        </item>
        <item>
          <p>
	    Use loopback as server option in TLS-distribution module</p>
          <p>
	    Own Id: OTP-13300</p>
        </item>
        <item>
          <p>
	    Verify certificate signature against original certificate
	    binary.</p>
          <p>
	    This avoids bugs due to encoding errors when re-encoding
	    a decode certificate. As there exists several decode step
	    and using of different ASN.1 specification this is a risk
	    worth avoiding.</p>
          <p>
	    Own Id: OTP-13334</p>
        </item>
        <item>
          <p>
	    Use <c>application:ensure_all_started/2</c> instead of
	    hard-coding dependencies</p>
          <p>
	    Own Id: OTP-13363</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 7.2</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Honor distribution port range options</p>
          <p>
	    Own Id: OTP-12838</p>
        </item>
        <item>
          <p>
	    Correct supervisor specification in TLS distribution.</p>
          <p>
	    Own Id: OTP-13134</p>
        </item>
        <item>
          <p>
	    Correct cache timeout</p>
          <p>
	    Own Id: OTP-13141</p>
        </item>
        <item>
          <p>
	    Avoid crash and restart of ssl process when key file does
	    not exist.</p>
          <p>
	    Own Id: OTP-13144</p>
        </item>
        <item>
          <p>
	    Enable passing of raw socket options on the format
	    {raw,_,_,_} to the underlying socket.</p>
          <p>
	    Own Id: OTP-13166</p>
        </item>
        <item>
          <p>
	    Hibernation with small or a zero timeout will now work as
	    expected</p>
          <p>
	    Own Id: OTP-13189</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Add upper limit for session cache, configurable on ssl
	    application level.</p>
          <p>
	    If upper limit is reached, invalidate the current cache
	    entries, e.i the session lifetime is the max time a
	    session will be keept, but it may be invalidated earlier
	    if the max limit for the table is reached. This will keep
	    the ssl manager process well behaved, not exhusting
	    memeory. Invalidating the entries will incrementally
	    empty the cache to make room for fresh sessions entries.</p>
          <p>
	    Own Id: OTP-12392</p>
        </item>
        <item>
          <p>
	    Use new time functions to measure passed time.</p>
          <p>
	    Own Id: OTP-12457</p>
        </item>
        <item>
          <p>
	    Improved error handling in TLS distribution</p>
          <p>
	    Own Id: OTP-13142</p>
        </item>
        <item>
          <p>
	    Distribution over TLS now honors the nodelay distribution
	    flag</p>
          <p>
	    Own Id: OTP-13143</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 7.1</title>
    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Add DER encoded ECPrivateKey as valid input format for
	    key option.</p>
          <p>
	    Own Id: OTP-12974</p>
        </item>
        <item>
          <p>
	    Correct return value of default session callback module</p>
          <p>
	    This error had the symptom that the client check for
	    unique session would always fail, potentially making the
	    client session table grow a lot and causing long setup
	    times.</p>
          <p>
	    Own Id: OTP-12980</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Add possibility to downgrade an SSL/TLS connection to a
	    tcp connection, and give back the socket control to a
	    user process.</p>
          <p>
	    This also adds the possibility to specify a timeout to
	    the ssl:close function.</p>
          <p>
	    Own Id: OTP-11397</p>
        </item>
        <item>
          <p>
	    Add application setting to be able to change fatal alert
	    shutdown timeout, also shorten the default timeout. The
	    fatal alert timeout is the number of milliseconds between
	    sending of a fatal alert and closing the connection.
	    Waiting a little while improves the peers chances to
	    properly receiving the alert so it may shutdown
	    gracefully.</p>
          <p>
	    Own Id: OTP-12832</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 7.0</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Ignore signature_algorithm (TLS 1.2 extension) sent to
	    TLS 1.0 or TLS 1.1 server</p>
          <p>
	    Own Id: OTP-12670</p>
        </item>
        <item>
          <p>
	    Improve error handling in TLS distribution module to
	    avoid lingering sockets.</p>
          <p>
	    Own Id: OTP-12799 Aux Id: Tom Briden </p>
        </item>
        <item>
          <p>
	    Add option {client_renegotiation, boolean()} option to
	    the server-side of the SSL application.</p>
          <p>
	    Own Id: OTP-12815</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Add new API functions to handle CRL-verification</p>
          <p>
	    Own Id: OTP-10362 Aux Id: kunagi-215 [126] </p>
        </item>
        <item>
          <p>
	    Remove default support for SSL-3.0, due to Poodle
	    vunrability in protocol specification.</p>
          <p>
	    Add padding check for TLS-1.0 to remove Poodle
	    vunrability from TLS 1.0, also add the option
	    padding_check. This option only affects TLS-1.0
	    connections and if set to false it disables the block
	    cipher padding check to be able to interoperate with
	    legacy software.</p>
          <p>
	    Remove default support for RC4 cipher suites, as they are
	    consider too weak.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-12390</p>
        </item>
        <item>
          <p>
	    Add support for TLS ALPN (Application-Layer Protocol
	    Negotiation) extension.</p>
          <p>
	    Own Id: OTP-12580</p>
        </item>
        <item>
          <p>
	    Add SNI (Server Name Indication) support for the server
	    side.</p>
          <p>
	    Own Id: OTP-12736</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 6.0.1.1</title>
    <section><title>Fixed Bugs and Malfunctions</title>
    <list>
          <item>
          <p>
	    Gracefully ignore proprietary hash_sign algorithms</p>
          <p>
	    Own Id: OTP-12829</p>
        </item>
    </list>
    </section>
</section>


<section><title>SSL 6.0.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Terminate gracefully when receving bad input to premaster
	    secret calculation</p>
          <p>
	    Own Id: OTP-12783</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 6.0</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Exclude self-signed trusted anchor certificates from
	    certificate prospective certification path according to
	    RFC 3280.</p>
          <p>
	    This will avoid some unnecessary certificate processing.</p>
          <p>
	    Own Id: OTP-12449</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Separate client and server session cache internally.</p>
          <p>
	    Avoid session table growth when client starts many
	    connections in such a manner that many connections are
	    started before session reuse is possible. Only save a new
	    session in client if there is no equivalent session
	    already stored.</p>
          <p>
	    Own Id: OTP-11365</p>
        </item>
        <item>
          <p>
	    The PEM cache is now validated by a background process,
	    instead of always keeping it if it is small enough and
	    clearing it otherwise. That strategy required that small
	    caches where cleared by API function if a file changes on
	    disk.</p>
          <p>
	    However export the API function to clear the cache as it
	    may still be useful.</p>
          <p>
	    Own Id: OTP-12391</p>
        </item>
        <item>
          <p>
	    Add padding check for TLS-1.0 to remove Poodle
	    vulnerability from TLS 1.0, also add the option
	    padding_check. This option only affects TLS-1.0
	    connections and if set to false it disables the block
	    cipher padding check to be able to interoperate with
	    legacy software.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-12420</p>
        </item>
        <item>
          <p>
	    Add support for TLS_FALLBACK_SCSV used to prevent
	    undesired TLS version downgrades. If used by a client
	    that is vulnerable to the POODLE attack, and the server
	    also supports TLS_FALLBACK_SCSV, the attack can be
	    prevented.</p>
          <p>
	    Own Id: OTP-12458</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 5.3.8</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Make sure the clean rule for ssh, ssl, eunit and otp_mibs
	    actually removes generated files.</p>
          <p>
	    Own Id: OTP-12200</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Change code to reflect that state data may be secret to
	    avoid breaking dialyzer contracts.</p>
          <p>
	    Own Id: OTP-12341</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 5.3.7</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Handle the fact that servers may send an empty SNI
	    extension to the client.</p>
          <p>
	    Own Id: OTP-12198</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 5.3.6</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Corrected handling of ECC certificates, there where
	    several small issues with the handling of such
	    certificates in the ssl and public_key application. Now
	    ECC signed ECC certificates shall work and not only RSA
	    signed ECC certificates.</p>
          <p>
	    Own Id: OTP-12026</p>
        </item>
        <item>
          <p>
	    Check that the certificate chain ends with a trusted ROOT
	    CA e.i. a self-signed certificate, but provide an option
	    partial_chain to enable the application to define an
	    intermediat CA as trusted.</p>
          <p>
	    Own Id: OTP-12149</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Add decode functions for SNI (Server Name Indication)</p>
          <p>
	    Own Id: OTP-12048</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 5.3.5</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    ssl:recv now returns {error, einval} if applied to a non
	    passive socket, the same as gen_tcp:recv. </p>
          <p>
	    Thanks to Danil Zagoskin for reporting this issue</p>
          <p>
	    Own Id: OTP-11878</p>
        </item>
        <item>
          <p>
	    Corrected handling of default values for
	    signature_algorithms extension in TLS-1.2 and
	    corresponding values used in previous versions that does
	    not support this extension. </p>
          <p>
	    Thanks to Danil Zagoskin</p>
          <p>
	    Own Id: OTP-11886</p>
        </item>
        <item>
          <p>
	    Handle socket option inheritance when pooling of accept
	    sockets is used</p>
          <p>
	    Own Id: OTP-11897</p>
        </item>
        <item>
          <p>
	    Make sure that the list of versions, possibly supplied in
	    the versions option, is not order dependent.</p>
          <p>
	    Thanks to Ransom Richardson for reporting this issue</p>
          <p>
	    Own Id: OTP-11912</p>
        </item>
        <item>
          <p>
	    Reject connection if the next_protocol message is sent
	    twice.</p>
          <p>
	    Own Id: OTP-11926</p>
        </item>
        <item>
          <p>
	    Correct options handling when ssl:ssl_accept/3 is called
	    with new ssl options after calling ssl:listen/2</p>
          <p>
	    Own Id: OTP-11950</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Gracefully handle unknown alerts</p>
          <p>
	    Thanks to Atul Atri for reporting this issue</p>
          <p>
	    Own Id: OTP-11874</p>
        </item>
        <item>
          <p>
	    Gracefully ignore cipher suites sent by client not
	    supported by the SSL/TLS version that the client has
	    negotiated.</p>
          <p>
	    Thanks to Danil Zagoskin for reporting this issue</p>
          <p>
	    Own Id: OTP-11875</p>
        </item>
        <item>
          <p>
	    Gracefully handle structured garbage, i.e a client sends
	    some garbage in a ssl record instead of a valid fragment.</p>
          <p>
	    Thanks to Danil Zagoskin</p>
          <p>
	    Own Id: OTP-11880</p>
        </item>
        <item>
          <p>
	    Gracefully handle invalid alerts</p>
          <p>
	    Own Id: OTP-11890</p>
        </item>
        <item>
          <p>
	    Generalize handling of default ciphers</p>
          <p>
	    Thanks to Andreas Schultz</p>
          <p>
	    Own Id: OTP-11966</p>
        </item>
        <item>
          <p>
	    Make sure change cipher spec is correctly handled</p>
          <p>
	    Own Id: OTP-11975</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 5.3.4</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Fix incorrect dialyzer spec and types, also enhance
	    documentation. </p>
          <p>
	    Thanks to Ayaz Tuncer.</p>
          <p>
	    Own Id: OTP-11627</p>
        </item>
        <item>
          <p>
	    Fix possible mismatch between SSL/TLS version and default
	    ciphers. Could happen when you specified SSL/TLS-version
	    in optionlist to listen or accept.</p>
          <p>
	    Own Id: OTP-11712</p>
        </item>
        <item>
          <p>
	    Application upgrade (appup) files are corrected for the
	    following applications: </p>
          <p>
	    <c>asn1, common_test, compiler, crypto, debugger,
	    dialyzer, edoc, eldap, erl_docgen, et, eunit, gs, hipe,
	    inets, observer, odbc, os_mon, otp_mibs, parsetools,
	    percept, public_key, reltool, runtime_tools, ssh,
	    syntax_tools, test_server, tools, typer, webtool, wx,
	    xmerl</c></p>
          <p>
	    A new test utility for testing appup files is added to
	    test_server. This is now used by most applications in
	    OTP.</p>
          <p>
	    (Thanks to Tobias Schlager)</p>
          <p>
	    Own Id: OTP-11744</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Moved elliptic curve definition from the crypto
	    NIF/OpenSSL into Erlang code, adds the RFC-5639 brainpool
	    curves and makes TLS use them (RFC-7027).</p>
          <p>
	    Thanks to Andreas Schultz</p>
          <p>
	    Own Id: OTP-11578</p>
        </item>
        <item>
          <p>
	    Unicode adaptations</p>
          <p>
	    Own Id: OTP-11620</p>
        </item>
        <item>
          <p>
	    Added option honor_cipher_order. This instructs the
	    server to prefer its own cipher ordering rather than the
	    client's and can help protect against things like BEAST
	    while maintaining compatability with clients which only
	    support older ciphers. </p>
          <p>
	    Thanks to Andrew Thompson for the implementation, and
	    Andreas Schultz for the test cases.</p>
          <p>
	    Own Id: OTP-11621</p>
        </item>
        <item>
          <p>
	    Replace boolean checking in validate_option with
	    is_boolean guard. </p>
          <p>
	    Thanks to Andreas Schultz.</p>
          <p>
	    Own Id: OTP-11634</p>
        </item>
        <item>
          <p>
	    Some function specs are corrected or moved and some edoc
	    comments are corrected in order to allow use of edoc.
	    (Thanks to Pierre Fenoll)</p>
          <p>
	    Own Id: OTP-11702</p>
        </item>
        <item>
          <p>
	    Correct clean up of certificate database when certs are
	    inputed in pure DER format.The incorrect code could cause
	    a memory leek when certs where inputed in DER. Thanks to
	    Bernard Duggan for reporting this.</p>
          <p>
	    Own Id: OTP-11733</p>
        </item>
        <item>
          <p>
	    Improved documentation of the cacertfile option</p>
          <p>
	    Own Id: OTP-11759 Aux Id: seq12535 </p>
        </item>
        <item>
          <p>
	    Avoid next protocol negotiation failure due to incorrect
	    option format.</p>
          <p>
	    Own Id: OTP-11760</p>
        </item>
        <item>
          <p>
	    Handle v1 CRLs, with no extensions and fixes issues with
	    IDP (Issuing Distribution Point) comparison during CRL
	    validation. </p>
          <p>
	    Thanks to Andrew Thompson</p>
          <p>
	    Own Id: OTP-11761</p>
        </item>
        <item>
          <p>
	    Server now ignores client ECC curves that it does not
	    support instead of crashing. </p>
          <p>
	    Thanks to Danil Zagoskin for reporting the issue and
	    suggesting a solution.</p>
          <p>
	    Own Id: OTP-11780</p>
        </item>
        <item>
          <p>
	    Handle SNI (Server Name Indication) alert
	    unrecognized_name and gracefully deal with unexpected
	    alerts. </p>
          <p>
	    Thanks to Masatake Daimon for reporting this.</p>
          <p>
	    Own Id: OTP-11815</p>
        </item>
        <item>
          <p>
	    Add possibility to specify ssl options when calling
	    ssl:ssl_accept</p>
          <p>
	    Own Id: OTP-11837</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 5.3.3</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Add missing validation of the server_name_indication
	    option and test for its explicit use. It was not possible
	    to set or disable the default server_name_indication as
	    the validation of the option was missing.</p>
          <p>
	    Own Id: OTP-11567</p>
        </item>
        <item>
          <p>
	    Elliptic curve selection in server mode now properly
	    selects a curve suggested by the client, if possible, and
	    the fallback alternative is changed to a more widely
	    supported curve.</p>
          <p>
	    Own Id: OTP-11575</p>
        </item>
        <item>
          <p>
	    Bug in the TLS hello extension handling caused the server
	    to behave as it did not understand secure renegotiation.</p>
          <p>
	    Own Id: OTP-11595</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 5.3.2</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Honors the clients advertised support of elliptic curves
	    and no longer sends incorrect elliptic curve extension in
	    server hello.</p>
          <p>
	    Own Id: OTP-11370</p>
        </item>
        <item>
          <p>
	    Fix initialization of DTLS fragment reassembler, in
	    previously contributed code, for future support of DTLS .
	    Thanks to Andreas Schultz.</p>
          <p>
	    Own Id: OTP-11376</p>
        </item>
        <item>
          <p>
	    Corrected type error in client_preferred_next_protocols
	    documentation. Thanks to Julien Barbot.</p>
          <p>
	    Own Id: OTP-11457</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    TLS code has been refactored to prepare for future DTLS
	    support. Also some DTLS code is in place but not yet
	    runnable, some of it contributed by Andreas Schultz and
	    some of it written by the OTP team. Thanks to to Andreas
	    for his participation.</p>
          <p>
	    Own Id: OTP-11292</p>
        </item>
        <item>
          <p>
	    Remove extraneous dev debug code left in the close
	    function. Thanks to Ken Key.</p>
          <p>
	    Own Id: OTP-11447</p>
        </item>
        <item>
          <p>
	    Add SSL Server Name Indication (SNI) client support.
	    Thanks to Julien Barbot.</p>
          <p>
	    Own Id: OTP-11460</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 5.3.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Setopts during renegotiation caused the renegotiation to
	    be unsuccessful.</p>
          <p>
	    If calling setopts during a renegotiation the FSM state
	    might change during the handling of the setopts messages,
	    this is now handled correctly.</p>
          <p>
	    Own Id: OTP-11228</p>
        </item>
        <item>
          <p>
	    Now handles signature_algorithm field in digitally_signed
	    properly with proper defaults. Prior to this change some
	    elliptic curve cipher suites could fail reporting the
	    error "bad certificate".</p>
          <p>
	    Own Id: OTP-11229</p>
        </item>
        <item>
          <p>
	    The code emulating the inet header option was changed in
	    the belief that it made it inet compatible. However the
	    testing is a bit hairy as the inet option is actually
	    broken, now the tests are corrected and the header option
	    should work in the same broken way as inet again,
	    preferably use the bitsyntax instead.</p>
          <p>
	    Own Id: OTP-11230</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Make the ssl manager name for erlang distribution over
	    SSL/TLS relative to the module name of the ssl_manager.</p>
          <p>
	    This can be beneficial when making tools that rename
	    modules for internal processing in the tool.</p>
          <p>
	    Own Id: OTP-11255</p>
        </item>
        <item>
          <p>
	    Add documentation regarding log_alert option.</p>
          <p>
	    Own Id: OTP-11271</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 5.3</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Honor the versions option to ssl:connect and ssl:listen.</p>
          <p>
	    Own Id: OTP-10905</p>
        </item>
        <item>
          <p>
	    Next protocol negotiation with reused sessions will now
	    succeed</p>
          <p>
	    Own Id: OTP-10909</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Add support for PSK (Pre Shared Key) and SRP (Secure
	    Remote Password) chipher suits, thanks to Andreas
	    Schultz.</p>
          <p>
	    Own Id: OTP-10450 Aux Id: kunagi-269 [180] </p>
        </item>
        <item>
          <p>
	    Fix SSL Next Protocol Negotiation documentation. Thanks
	    to Julien Barbot.</p>
          <p>
	    Own Id: OTP-10955</p>
        </item>
        <item>
          <p>
	    Fix ssl_connection to support reading proxy/chain
	    certificates. Thanks to Valentin Kuznetsov.</p>
          <p>
	    Own Id: OTP-10980</p>
        </item>
        <item>
          <p>
	    Integrate elliptic curve contribution from Andreas
	    Schultz </p>
          <p>
	    In order to be able to support elliptic curve cipher
	    suites in SSL/TLS, additions to handle elliptic curve
	    infrastructure has been added to public_key and crypto.</p>
          <p>
	    This also has resulted in a rewrite of the crypto API to
	    gain consistency and remove unnecessary overhead. All OTP
	    applications using crypto has been updated to use the new
	    API.</p>
          <p>
	    Impact: Elliptic curve cryptography (ECC) offers
	    equivalent security with smaller key sizes than other
	    public key algorithms. Smaller key sizes result in
	    savings for power, memory, bandwidth, and computational
	    cost that make ECC especially attractive for constrained
	    environments.</p>
          <p>
	    Own Id: OTP-11009</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 5.2.1</title>
    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Transport callback handling is changed so that gen_tcp is
	    treated as a special case where inet will be called
	    directly for functions such as setopts, as gen_tcp does
	    not have its own setopts. This will enable users to use
	    the transport callback for other customizations such as
	    websockets.</p>
          <p>
	    Own Id: OTP-10847</p>
        </item>
        <item>
          <p>
	    Follow up to OTP-10451 solved in ssl-5.2 R16A. Make sure
	    format_error return good strings. Replace confusing
	    legacy atoms with more descriptive atoms.</p>
          <p>
	    Own Id: OTP-10864</p>
        </item>
      </list>
    </section>

</section>
<section><title>SSL 5.1.2.1</title>
<section><title>Improvements and New Features</title>
<list>
  <item>
    <p>
      Make log_alert configurable as option in ssl, SSLLogLevel
    added as option to inets conf file</p>
    <p>
    Own Id: OTP-11259</p>
  </item>
</list>
</section>
</section>
<section><title>SSL 5.2</title>
    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    SSL: TLS 1.2, advertise sha224 support, thanks to Andreas
	    Schultz.</p>
          <p>
	    Own Id: OTP-10586</p>
        </item>
        <item>
          <p>
	    If an ssl server is restarted with new options and a
	    client tries to reuse a session the server must make sure
	    that it complies to the new options before agreeing to
	    reuse it.</p>
          <p>
	    Own Id: OTP-10595</p>
        </item>
        <item>
          <p>
	    Now handles cleaning of CA-certificate database correctly
	    so that there will be no memory leek, bug was introduced
	    in ssl- 5.1 when changing implementation to increase
	    parallel execution.</p>
          <p>
	    Impact: Improved memory usage, especially if you have
	    many different certificates and upgrade tcp-connections
	    to TLS-connections.</p>
          <p>
	    Own Id: OTP-10710</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Support Next Protocol Negotiation in TLS, thanks to Ben
	    Murphy for the contribution.</p>
          <p>
	    Impact: Could give performance benefit if used as it
	    saves a round trip.</p>
          <p>
	    Own Id: OTP-10361 Aux Id: kunagi-214 [125] </p>
        </item>
        <item>
          <p>
	    TLS 1.2 will now be the default TLS version if sufficient
	    crypto support is available otherwise TLS 1.1 will be
	    default.</p>
          <p>
	    Impact: A default TLS connection will have higher
	    security and hence it may be perceived as slower then
	    before.</p>
          <p>
	    Own Id: OTP-10425 Aux Id: kunagi-275 [186] </p>
        </item>
        <item>
          <p>
	    It is now possible to call controlling_process on a
	    listen socket, same as in gen_tcp.</p>
          <p>
	    Own Id: OTP-10447</p>
        </item>
        <item>
          <p>
	    Remove filter mechanisms that made error messages
	    backwards compatible with old ssl but hid information
	    about what actually happened.</p>
          <p>
	    This does not break the documented API however other
	    reason terms may be returned, so code that matches on the
	    reason part of {error, Reason} may fail.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-10451 Aux Id: kunagi-270 [181] </p>
        </item>
        <item>
          <p>
	    Added missing dependencies to Makefile</p>
          <p>
	    Own Id: OTP-10594</p>
        </item>
        <item>
          <p>
	    Removed deprecated function ssl:pid/0, it has been
	    pointless since R14 but has been keep for backwards
	    compatibility.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-10613 Aux Id: kunagi-331 [242] </p>
        </item>
        <item>
          <p>
	    Refactor to simplify addition of key exchange methods,
	    thanks to Andreas Schultz.</p>
          <p>
	    Own Id: OTP-10709</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 5.1.2</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    ssl:ssl_accept/2 timeout is no longer ignored</p>
          <p>
	    Own Id: OTP-10600</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 5.1.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    ssl:recv/3 could "loose" data when the timeout occurs. If
	    the timout in ssl:connect or ssl:ssl_accept expired the
	    ssl connection process was not terminated as it should,
	    this due to gen_fsm:send_all_state_event timout is a
	    client side time out. These timouts are now handled by
	    the gen_fsm-procss instead.</p>
          <p>
	    Own Id: OTP-10569</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Better termination handling that avoids hanging.</p>
          <p>
	    Own Id: OTP-10574</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 5.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Sometimes the client process could receive an extra
	    {error, closed} message after ssl:recv had returned
	    {error, closed}.</p>
          <p>
	    Own Id: OTP-10118</p>
        </item>
        <item>
          <p>
	    ssl v3 alert number 41 (no_certificate_RESERVED) is now
	    recognized</p>
          <p>
	    Own Id: OTP-10196</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Experimental support for TLS 1.1 is now available, will
	    be officially supported from OTP-R16. Thanks to Andreas
	    Schultz for implementing the first version.</p>
          <p>
	    Own Id: OTP-8871</p>
        </item>
        <item>
          <p>
	    Experimental support for TLS 1.2 is now available, will
	    be officially supported from OTP-R16. Thanks to Andreas
	    Schultz for implementing the first version.</p>
          <p>
	    Own Id: OTP-8872</p>
        </item>
        <item>
          <p>
	    Removed some bottlenecks increasing the applications
	    parallelism especially for the client side.</p>
          <p>
	    Own Id: OTP-10113</p>
        </item>
        <item>
          <p>
	    Workaround for handling certificates that wrongly encode
	    X509countryname in utf-8 when the actual value is a valid
	    ASCCI value of length 2. Such certificates are accepted
	    by many browsers such as Chrome and Fierfox so for
	    interoperability reasons we will too.</p>
          <p>
	    Own Id: OTP-10222</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 5.0.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Robustness and improvement to distribution over SSL</p>
          <p>
	    Fix a bug where ssl_tls_dist_proxy would crash at caller
	    timeout. Fix a bug where a timeout from the SSL layer
	    would block the distribution indefinately. Run the proxy
	    exclusively on the loopback interface. (Thanks to Paul
	    Guyot)</p>
          <p>
	    Own Id: OTP-9915</p>
        </item>
        <item>
          <p>
	    Fix setup loop of SSL TLS dist proxy</p>
          <p>
	    Fix potential leak of processes waiting indefinately for
	    data from closed sockets during socket setup phase.
	    (Thanks to Paul Guyot)</p>
          <p>
	    Own Id: OTP-9916</p>
        </item>
        <item>
          <p>
	    Correct spelling of registered (Thanks to Richard
	    Carlsson)</p>
          <p>
	    Own Id: OTP-9925</p>
        </item>
        <item>
          <p>
	    Added TLS PRF function to the SSL API for generation of
	    additional key material from a TLS session. (Thanks to
	    Andreas Schultz)</p>
          <p>
	    Own Id: OTP-10024</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 5.0</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Invalidation handling of sessions could cause the
	    time_stamp field in the session record to be set to
	    undefined crashing the session clean up process. This did
	    not affect the connections but would result in that the
	    session table would grow.</p>
          <p>
	    Own Id: OTP-9696 Aux Id: seq11947 </p>
        </item>
        <item>
          <p>
	    Changed code to use ets:foldl and throw instead of
	    ets:next traversal, avoiding the need to explicitly call
	    ets:safe_fixtable. It was possible to get a badarg-crash
	    under special circumstances.</p>
          <p>
	    Own Id: OTP-9703 Aux Id: seq11947 </p>
        </item>
        <item>
          <p>
	    Send ssl_closed notification to active ssl user when a
	    tcp error occurs.</p>
          <p>
	    Own Id: OTP-9734 Aux Id: seq11946 </p>
        </item>
        <item>
          <p>
	    If a passive receive was ongoing during a renegotiation
	    the process evaluating ssl:recv could be left hanging for
	    ever.</p>
          <p>
	    Own Id: OTP-9744</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Support for the old ssl implementation is dropped and the
	    code is removed.</p>
          <p>
	    Own Id: OTP-7048</p>
        </item>
        <item>
          <p>
	    The erlang distribution can now be run over the new ssl
	    implementation. All options can currently not be set but
	    it is enough to replace to old ssl implementation.</p>
          <p>
	    Own Id: OTP-7053</p>
        </item>
        <item>
          <p>
	    public_key, ssl and crypto now supports PKCS-8</p>
          <p>
	    Own Id: OTP-9312</p>
        </item>
        <item>
          <p>
	    Implements a CBC timing attack counter measure. Thanks to
	    Andreas Schultz for providing the patch.</p>
          <p>
	    Own Id: OTP-9683</p>
        </item>
        <item>
          <p>
	    Mitigates an SSL/TLS Computational DoS attack by
	    disallowing the client to renegotiate many times in a row
	    in a short time interval, thanks to Tuncer Ayaz for
	    alerting us about this.</p>
          <p>
	    Own Id: OTP-9739</p>
        </item>
        <item>
          <p>
	    Implements the 1/n-1 splitting countermeasure to the
	    Rizzo Duong BEAST attack, affects SSL 3.0 and TLS 1.0.
	    Thanks to Tuncer Ayaz for alerting us about this.</p>
          <p>
	    Own Id: OTP-9750</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 4.1.6</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    replace "a ssl" with "an ssl" reindent
	    pkix_path_validation/3 Trivial documentation fixes
	    (Thanks to Christian von Roques )</p>
          <p>
	    Own Id: OTP-9464</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Adds function clause to avoid denial of service attack.
	    Thanks to Vinod for reporting this vulnerability.</p>
          <p>
	    Own Id: OTP-9364</p>
        </item>
        <item>
          <p>
	    Error handling code now takes care of inet:getopts/2 and
	    inets:setopts/2 crashes. Thanks to Richard Jones for
	    reporting this.</p>
          <p>
	    Own Id: OTP-9382</p>
        </item>
        <item>
          <p>
	    Support explicit use of packet option httph and httph_bin</p>
          <p>
	    Own Id: OTP-9461</p>
        </item>
        <item>
          <p>
	    Decoding of hello extensions could fail to come to the
	    correct conclusion due to an error in a binary match
	    pattern. Thanks to Ben Murphy.</p>
          <p>
	    Own Id: OTP-9589</p>
        </item>
      </list>
    </section>

</section>

<section>
    <title>SSL 4.1.5</title>
    
    <section><title>Improvements and New Features</title>
    <list>
      <item>
	<p>Calling gen_tcp:connect with option {ip, {127,0,0,1}} results in 
	an exit with reason badarg. Neither SSL nor INETS This was not 
	catched, resulting in crashes with incomprehensible reasons.</p>
	<p>Own Id: OTP-9289 Aux Id: seq11845</p>
      </item>
    </list>
    </section>
    
  </section>
  
  <section>
    <title>SSL 4.1.3</title>
  
    <section><title>Fixed Bugs and Malfunctions</title>
    <list>
      <item>
	<p>
	Fixed error in cache-handling fix from ssl-4.1.2</p>
	<p>
	Own Id: OTP-9018 Aux Id: seq11739 </p>
      </item>
      <item>
	<p>Verification of a critical extended_key_usage-extension
	corrected</p>
	<p>Own Id: OTP-9029 Aux Id: seq11541 </p>
      </item>
    </list>
    </section>

  </section>

  <section>
    <title>SSL 4.1.2</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    The ssl application caches certificate files, it will now
	    invalidate cache entries if the diskfile is changed.</p>
          <p>
	    Own Id: OTP-8965 Aux Id: seq11739 </p>
        </item>
        <item>
          <p>
	    Now runs the terminate function before returning from the
	    call made by ssl:close/1, as before the caller of
	    ssl:close/1 could get problems with the reuseaddr option.</p>
          <p>
	    Own Id: OTP-8992</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 4.1.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Correct handling of client certificate verify message
	    When checking the client certificate verify message the
	    server used the wrong algorithm identifier to determine
	    the signing algorithm, causing a function clause error in
	    the public_key application when the key-exchange
	    algorithm and the public key algorithm of the client
	    certificate happen to differ.</p>
          <p>
	    Own Id: OTP-8897</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    For testing purposes ssl now also support some anonymous
	    cipher suites when explicitly configured to do so.</p>
          <p>
	    Own Id: OTP-8870</p>
        </item>
        <item>
          <p>
	    Sends an error alert instead of crashing if a crypto
	    function for the selected cipher suite fails.</p>
          <p>
	    Own Id: OTP-8930 Aux Id: seq11720 </p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 4.1</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Updated ssl to ignore CA certs that violate the asn1-spec
	    for a certificate, and updated public key asn1 spec to
	    handle inherited DSS-params.</p>
          <p>
	    Own Id: OTP-7884</p>
        </item>
        <item>
          <p>
	    Changed ssl implementation to retain backwards
	    compatibility for old option {verify, 0} that shall be
	    equivalent to {verify, verify_none}, also separate the
	    cases unknown ca and selfsigned peer cert, and restored
	    return value of deprecated function
	    public_key:pem_to_der/1.</p>
          <p>
	    Own Id: OTP-8858</p>
        </item>
        <item>
          <p>
	    Changed the verify fun so that it differentiate between
	    the peer certificate and CA certificates by using
	    valid_peer or valid as the second argument to the verify
	    fun. It may not always be trivial or even possible to
	    know when the peer certificate is reached otherwise.</p>
          <p>
	    *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
	    Own Id: OTP-8873</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 4.0.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    The server now verifies the client certificate verify
	    message correctly, instead of causing a case-clause.</p>
          <p>
	    Own Id: OTP-8721</p>
        </item>
        <item>
          <p>
	    The client hello message now always include ALL available
	    cipher suites (or those specified by the ciphers option).
	    Previous implementation would filter them based on the
	    client certificate key usage extension (such filtering
	    only makes sense for the server certificate).</p>
          <p>
	    Own Id: OTP-8772</p>
        </item>
        <item>
          <p>
	    Fixed handling of the option {mode, list} that was broken
	    for some packet types for instance line.</p>
          <p>
	    Own Id: OTP-8785</p>
        </item>
        <item>
          <p>
	    Empty packets were not delivered to the client.</p>
          <p>
	    Own Id: OTP-8790</p>
        </item>
        <item>
	    <p> Building in a source tree without prebuilt platform
	    independent build results failed on the SSL examples
	    when: </p> <list><item> cross building. This has been
	    solved by not building the SSL examples during a cross
	    build. </item><item> building on Windows. </item></list>
          <p>
	    Own Id: OTP-8791</p>
        </item>
        <item>
          <p>
	    Fixed a handshake error which occurred on some ssl
	    implementations.</p>
          <p>
	    Own Id: OTP-8793</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Revise the public_key API - Cleaned up and documented the
	    public_key API to make it useful for general use, also
	    changed ssl to use the new API.</p>
          <p>
	    Own Id: OTP-8722</p>
        </item>
        <item>
          <p>
	    Added support for inputing certificates and keys directly
	    in DER format these options will override the pem-file
	    options if specified.</p>
          <p>
	    Own Id: OTP-8723</p>
        </item>
        <item>
          <p>
	    To gain interoperability ssl will not check for padding
	    errors when using TLS 1.0. It is first in TLS 1.1 that
	    checking the padding is an requirement.</p>
          <p>
	    Own Id: OTP-8740</p>
        </item>
        <item>
          <p>
	    Changed the semantics of the verify_fun option in the
	    ssl-application so that it takes care of both application
	    handling of path validation errors and verification of
	    application specific extensions. This means that it is
	    now possible for the server application in verify_peer
	    mode to handle path validation errors. This change moved
	    some functionality earlier in ssl to the public_key
	    application.</p>
          <p>
	    Own Id: OTP-8770</p>
        </item>
        <item>
          <p>
	    Added the functionality so that the verification fun will
	    be called when a certificate is considered valid by the
	    path validation to allow access to each certificate in
	    the path to the user application. Also try to verify
	    subject-AltName, if unable to verify it let the
	    application verify it.</p>
          <p>
	    Own Id: OTP-8825</p>
        </item>
      </list>
    </section>

</section>

<section><title>SSL 4.0</title>
    
    <section><title>Improvements and New Features</title>
    <list>
      <item>
	<p>
	  New ssl now support client/server-certificates signed by
	dsa keys.</p>
	<p>
	Own Id: OTP-8587</p>
      </item>
      <item>
	<p>
	  Ssl has now switched default implementation and removed
	  deprecated certificate handling. All certificate handling
	is done by the public_key application.</p>
	<p>
	Own Id: OTP-8695</p>
      </item>
    </list>
    </section>
    </section>
</chapter>