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<H1>ssl</H1>
</CENTER>
<H3>APPLICATION</H3>
<DIV CLASS=REFBODY>
ssl
</DIV>
<H3>APPLICATION SUMMARY</H3>
<DIV CLASS=REFBODY>
The SSL Application
</DIV>
<H3>DESCRIPTION</H3>
<DIV CLASS=REFBODY>
<P>The Secure Socket Layer (SSL) application provides secure
socket communication over TCP/IP.
</DIV>
<H3>Warning</H3>
<DIV CLASS=REFBODY>
<P>In previous versions of Erlang/OTP SSL it was advised, as a
work-around, to set the operating system environment variable
<CODE>SSL_CERT_FILE</CODE> to point at a file containing CA
certificates. That variable is no longer needed, and is not
recognised by Erlang/OTP SSL any more.
<P>However, the OpenSSL package does interpret that environment
variable. Hence a setting of that variable might have
unpredictable effects on the Erlang/OTP SSL application. It is
therefore adviced to not used that environment variable at all.
</DIV>
<H3>Environment</H3>
<DIV CLASS=REFBODY>
<P>The following application environment configuration parameters
are defined for the SSL application. Refer to application(3) for
more information about configuration parameters.
<P>
<DL>
<DT>
<CODE>ephemeral_rsa = true | false <optional></CODE>
</DT>
<DD>
Enables all SSL servers (those that listen and accept)
to use ephemeral RSA key generation when a clients connect with
weak handshake cipher specifications, that need equally weak
ciphers from the server (i.e. obsolete restrictions on export
ciphers). Default is <CODE>false</CODE>.
<BR>
</DD>
<DT>
<CODE>debug = true | false <optional></CODE>
</DT>
<DD>
Causes debug information to be written to standard
output. Default is <CODE>false</CODE>.
<BR>
</DD>
<DT>
<CODE>debugdir = path() | false <optional></CODE>
</DT>
<DD>
Causes debug information output controlled by <CODE>debug</CODE>
and <CODE>msgdebug</CODE> to be printed to a file named
<CODE>ssl_esock.<pid>.log</CODE> in the directory specified by
<CODE>debugdir</CODE>, where <CODE><pid></CODE> is the operating system
specific textual representation of the process indentifier
of the external port program of the SSL application. Default
is <CODE>false</CODE>, i.e. no log file is produced.
<BR>
</DD>
<DT>
<CODE>msgdebug = true | false <optional></CODE>
</DT>
<DD>
Sets <CODE>debug = true</CODE> and causes also the contents
of low level messages to be printed to standard output.
Default is <CODE>false</CODE>.
<BR>
</DD>
<DT>
<CODE>port_program = string() | false <optional></CODE>
</DT>
<DD>
Name of port program. The default is <CODE>ssl_esock</CODE>.
<BR>
</DD>
<DT>
<CODE>proxylsport = integer() | false <optional></CODE>
</DT>
<DD>
Define the port number of the listen port of the
SSL port program. Almost never is this option needed.
<BR>
</DD>
<DT>
<CODE>proxylsbacklog = integer() | false <optional></CODE>
</DT>
<DD>
Set the listen queue size of the listen port of the
SSL port program. The default is 5.
<BR>
</DD>
</DL>
</DIV>
<H3>OpenSSL libraries</H3>
<DIV CLASS=REFBODY>
<P>The current implementation of the Erlang SSL application is
based on the <STRONG>OpenSSL</STRONG> package version 0.9.7 or higher.
There are source and binary releases on the web.
<P>Source releases of OpenSSL can be downloaded from the <A TARGET="_top" HREF="http://www.openssl.org">OpenSSL</A> project home page,
or mirror sites listed there.
<P>The same URL also contains links to some compiled binaries and
libraries of OpenSSL (see the <CODE>Related/Binaries</CODE> menu) of
which the <A TARGET="_top" HREF="http://www.shininglightpro.com/search.php?searchname=Win32+OpenSSL"> Shining Light Productions Win32 and OpenSSL</A> pages are of
interest for the Win32 user.
<P>For some Unix flavours there are binary packages available
on the net.
<P>If you cannot find a suitable binary OpenSSL package, you
have to fetch an OpenSSL source release and compile it.
<P>You then have to compile and install the libraries
<CODE>libcrypto.so</CODE> and <CODE>libssl.so</CODE> (Unix), or the
libraries <CODE>libeay32.dll</CODE> and <CODE>ssleay32.dll</CODE> (Win32).
<P>For Unix The <CODE>ssl_esock</CODE> port program is delivered linked
to OpenSSL libraries in <CODE>/usr/local/lib</CODE>, but the default
dynamic linking will also accept libraries in <CODE>/lib</CODE> and
<CODE>/usr/lib</CODE>.
<P> If that is not applicable to the particular Unix operating
system used, the example <CODE>Makefile</CODE> in the SSL
<CODE>priv/obj</CODE> directory, should be used as a guide to
relinking the final version of the port program.
<P> For <CODE>Win32</CODE> it is only required that the libraries can be
found from the <CODE>PATH</CODE> environment variable, or that they
reside in the appropriate <CODE>SYSTEM32</CODE> directory; hence no
particular relinking is need. Hence no example <CODE>Makefile</CODE>
for Win32 is provided.
</DIV>
<H3>Restrictions</H3>
<DIV CLASS=REFBODY>
<P>Users must be aware of export restrictions and patent rights
concerning cryptographic software.
</DIV>
<H3>SEE ALSO</H3>
<DIV CLASS=REFBODY>
<P>application(3)
</DIV>
<H3>AUTHORS</H3>
<DIV CLASS=REFBODY>
Peter Hgfeldt - support@erlang.ericsson.se<BR>
</DIV>
<CENTER>
<HR>
<SMALL>ssl 3.0.4<BR>
Copyright © 1991-2004
<A HREF="http://www.erlang.se">Ericsson AB</A><BR>
</SMALL>
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