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

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<!DOCTYPE chapter SYSTEM "chapter.dtd">

<chapter>
  <header>
    <copyright>
      <year>1999</year><year>2013</year>
      <holder>Ericsson AB. All Rights Reserved.</holder>
    </copyright>
    <legalnotice>
      The contents of this file are subject to the Erlang Public License,
      Version 1.1, (the "License"); you may not use this file except in
      compliance with the License. You should have received a copy of the
      Erlang Public License along with this software. If not, it can be
      retrieved online at http://www.erlang.org/.

      Software distributed under the License is distributed on an "AS IS"
      basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
      the License for the specific language governing rights 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 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>