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<h1 class="lined-header"><span>ranch_ssl(3)</span></h1>
<h2 id="_name">Name</h2>
<p>ranch_ssl - SSL transport module</p>
<h2 id="_description">Description</h2>
<p>The <code>ranch_ssl</code> module implements an SSL Ranch transport.</p>
<h2 id="_types">Types</h2>
<h3 id="_ssl_opt">ssl_opt()</h3>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><b><font color="#000000">ssl_opt</font></b>() <font color="#990000">=</font> {<font color="#FF6600">alpn_preferred_protocols</font>, [<b><font color="#000080">binary</font></b>()]}
| {<font color="#FF6600">beast_mitigation</font>, <font color="#FF6600">one_n_minus_one</font> | <font color="#FF6600">zero_n</font> | <font color="#FF6600">disabled</font>}
| {<font color="#FF6600">cacertfile</font>, <b><font color="#000000">string</font></b>()}
| {<font color="#FF6600">cacerts</font>, [<b><font color="#000000">public_key:der_encoded</font></b>()]}
| {<font color="#FF6600">cert</font>, <b><font color="#000000">public_key:der_encoded</font></b>()}
| {<font color="#FF6600">certfile</font>, <b><font color="#000000">string</font></b>()}
| {<font color="#FF6600">ciphers</font>, [<b><font color="#000000">ssl:erl_cipher_suite</font></b>()] | <b><font color="#000000">string</font></b>()}
| {<font color="#FF6600">client_renegotiation</font>, <b><font color="#000000">boolean</font></b>()}
| {<font color="#FF6600">crl_cache</font>, {<b><font color="#000000">module</font></b>(), {<font color="#FF6600">internal</font> | <b><font color="#000000">any</font></b>(), <b><font color="#000080">list</font></b>()}}}
| {<font color="#FF6600">crl_check</font>, <b><font color="#000000">boolean</font></b>() | <font color="#FF6600">peer</font> | <font color="#FF6600">best_effort</font>}
| {<font color="#FF6600">depth</font>, <font color="#993399">0</font><font color="#990000">..</font><font color="#993399">255</font>}
| {<font color="#FF6600">dh</font>, <b><font color="#000000">public_key:der_encoded</font></b>()}
| {<font color="#FF6600">dhfile</font>, <b><font color="#000000">string</font></b>()}
| {<font color="#FF6600">fail_if_no_peer_cert</font>, <b><font color="#000000">boolean</font></b>()}
| {<font color="#FF6600">hibernate_after</font>, <b><font color="#000080">integer</font></b>() | <font color="#000080">undefined</font>}
| {<font color="#FF6600">honor_cipher_order</font>, <b><font color="#000000">boolean</font></b>()}
| {<font color="#FF6600">key</font>, {<font color="#FF6600">'RSAPrivateKey'</font> | <font color="#FF6600">'DSAPrivateKey'</font> | <font color="#FF6600">'PrivateKeyInfo'</font>, <b><font color="#000000">public_key:der_encoded</font></b>()}}
| {<font color="#FF6600">keyfile</font>, <b><font color="#000000">string</font></b>()}
| {<font color="#FF6600">log_alert</font>, <b><font color="#000000">boolean</font></b>()}
| {<font color="#FF6600">next_protocols_advertised</font>, [<b><font color="#000080">binary</font></b>()]}
| {<font color="#FF6600">padding_check</font>, <b><font color="#000000">boolean</font></b>()}
| {<font color="#FF6600">partial_chain</font>, <b><font color="#0000FF">fun</font></b>(([<b><font color="#000000">public_key:der_encoded</font></b>()]) <font color="#990000">-></font> {<font color="#FF6600">trusted_ca</font>, <b><font color="#000000">public_key:der_encoded</font></b>()} | <font color="#FF6600">unknown_ca</font>)}
| {<font color="#FF6600">password</font>, <b><font color="#000000">string</font></b>()}
| {<font color="#FF6600">psk_identity</font>, <b><font color="#000000">string</font></b>()}
| {<font color="#FF6600">reuse_session</font>, <b><font color="#0000FF">fun</font></b>()}
| {<font color="#FF6600">reuse_sessions</font>, <b><font color="#000000">boolean</font></b>()}
| {<font color="#FF6600">secure_renegotiate</font>, <b><font color="#000000">boolean</font></b>()}
| {<font color="#FF6600">signature_algs</font>, [{<b><font color="#000080">atom</font></b>(), <b><font color="#000080">atom</font></b>()}]}
| {<font color="#FF6600">sni_fun</font>, <b><font color="#0000FF">fun</font></b>()}
| {<font color="#FF6600">sni_hosts</font>, [{<b><font color="#000000">string</font></b>(), <b><font color="#000000">ssl_opt</font></b>()}]}
| {<font color="#FF6600">user_lookup_fun</font>, {<b><font color="#0000FF">fun</font></b>(), <b><font color="#000000">any</font></b>()}}
| {<font color="#FF6600">v2_hello_compatible</font>, <b><font color="#000000">boolean</font></b>()}
| {<font color="#FF6600">verify</font>, <b><font color="#000000">ssl:verify_type</font></b>()}
| {<font color="#FF6600">verify_fun</font>, {<b><font color="#0000FF">fun</font></b>(), <b><font color="#000000">any</font></b>()}}
| {<font color="#FF6600">versions</font>, [<b><font color="#000080">atom</font></b>()]}<font color="#990000">.</font></tt></pre>
</div></div>
<p>SSL-specific listen options.</p>
<h3 id="_opt_____ranch_tcp_opt_____ssl_opt">opt() = ranch_tcp:opt() | ssl_opt()</h3>
<p>Listen options.</p>
<h3 id="_opts______opt">opts() = [opt()]</h3>
<p>List of listen options.</p>
<h2 id="_option_descriptions">Option descriptions</h2>
<p>Specifying a certificate is mandatory, either through the <code>cert</code> or the <code>certfile</code> option. None of the other options are required.</p>
<p>The default value is given next to the option name.</p>
<dl><dt>alpn_preferred_protocols</dt>
<dd><p>Perform Application-Layer Protocol Negotiation with the given list of preferred protocols.</p>
</dd>
<dt>beast_mitigation</dt>
<dd><p>Change the BEAST mitigation strategy for SSL-3.0 and TLS-1.0 to interoperate with legacy software.</p>
</dd>
<dt>cacertfile</dt>
<dd><p>Path to PEM encoded trusted certificates file used to verify peer certificates.</p>
</dd>
<dt>cacerts</dt>
<dd><p>List of DER encoded trusted certificates.</p>
</dd>
<dt>cert</dt>
<dd><p>DER encoded user certificate.</p>
</dd>
<dt>certfile</dt>
<dd><p>Path to the PEM encoded user certificate file. May also contain the private key.</p>
</dd>
<dt>ciphers</dt>
<dd><p>List of ciphers that clients are allowed to use.</p>
</dd>
<dt>client_renegotiation (true)</dt>
<dd><p>Whether to allow client-initiated renegotiation.</p>
</dd>
<dt>crl_cache ({ssl_crl_cache, {internal, []}})</dt>
<dd><p>Customize the module used to cache Certificate Revocation Lists.</p>
</dd>
<dt>crl_check (false)</dt>
<dd><p>Whether to perform CRL check on all certificates in the chain during validation.</p>
</dd>
<dt>depth (1)</dt>
<dd><p>Maximum of intermediate certificates allowed in the certification path.</p>
</dd>
<dt>dh</dt>
<dd><p>DER encoded Diffie-Hellman parameters.</p>
</dd>
<dt>dhfile</dt>
<dd><p>Path to the PEM encoded Diffie-Hellman parameters file.</p>
</dd>
<dt>fail_if_no_peer_cert (false)</dt>
<dd><p>Whether to refuse the connection if the client sends an empty certificate.</p>
</dd>
<dt>hibernate_after (undefined)</dt>
<dd><p>Time in ms after which SSL socket processes go into hibernation to reduce memory usage.</p>
</dd>
<dt>honor_cipher_order (false)</dt>
<dd><p>If true, use the server's preference for cipher selection. If false, use the client's preference.</p>
</dd>
<dt>key</dt>
<dd><p>DER encoded user private key.</p>
</dd>
<dt>keyfile</dt>
<dd><p>Path to the PEM encoded private key file, if different than the certfile.</p>
</dd>
<dt>log_alert (true)</dt>
<dd><p>If false, error reports will not be displayed.</p>
</dd>
<dt>next_protocols_advertised</dt>
<dd><p>List of protocols to send to the client if it supports the Next Protocol extension.</p>
</dd>
<dt>nodelay (true)</dt>
<dd><p>Whether to enable TCP_NODELAY.</p>
</dd>
<dt>padding_check</dt>
<dd><p>Allow disabling the block cipher padding check for TLS-1.0 to be able to interoperate with legacy software.</p>
</dd>
<dt>partial_chain</dt>
<dd><p>Claim an intermediate CA in the chain as trusted.</p>
</dd>
<dt>password</dt>
<dd><p>Password to the private key file, if password protected.</p>
</dd>
<dt>psk_identity</dt>
<dd><p>Provide the given PSK identity hint to the client during the handshake.</p>
</dd>
<dt>reuse_session</dt>
<dd><p>Custom policy to decide whether a session should be reused.</p>
</dd>
<dt>reuse_sessions (false)</dt>
<dd><p>Whether to allow session reuse.</p>
</dd>
<dt>secure_renegotiate (false)</dt>
<dd><p>Whether to reject renegotiation attempts that do not conform to RFC5746.</p>
</dd>
<dt>signature_algs</dt>
<dd><p>The TLS signature algorithm extension may be used, from TLS 1.2, to negotiate which signature algorithm to use during the TLS handshake.</p>
</dd>
<dt>sni_fun</dt>
<dd><p>Function called when the client requests a host using Server Name Indication. Returns options to apply.</p>
</dd>
<dt>sni_hosts</dt>
<dd><p>Options to apply for the host that matches what the client requested with Server Name Indication.</p>
</dd>
<dt>user_lookup_fun</dt>
<dd><p>Function called to determine the shared secret when using PSK, or provide parameters when using SRP.</p>
</dd>
<dt>v2_hello_compatible</dt>
<dd><p>Accept clients that send hello messages in SSL-2.0 format while offering supported SSL/TLS versions.</p>
</dd>
<dt>verify (verify_none)</dt>
<dd><p>Use <code>verify_peer</code> to request a certificate from the client.</p>
</dd>
<dt>verify_fun</dt>
<dd><p>Custom policy to decide whether a client certificate is valid.</p>
</dd>
<dt>versions</dt>
<dd><p>TLS protocol versions that will be supported.</p>
</dd>
</dl>
<p>Note that the client will not send a certificate unless the value for the <code>verify</code> option is set to <code>verify_peer</code>. This means that the <code>fail_if_no_peer_cert</code> only apply when combined with the <code>verify</code> option. The <code>verify_fun</code> option allows greater control over the client certificate validation.</p>
<p>The options <code>sni_fun</code> and <code>sni_hosts</code> are mutually exclusive.</p>
<h2 id="_exports">Exports</h2>
<p>None.</p>
</div>
<div class="span3 sidecol">
<h3>
Ranch
1.3
Function Reference
</h3>
<ul>
<li><a href="/docs/en/ranch/1.3/guide">User Guide</a></li>
<li><a href="/docs/en/ranch/1.3/manual">Function Reference</a></li>
</ul>
<h4 id="docs-nav">Navigation</h4>
<h4>Version select</h4>
<ul>
<li><a href="/docs/en/ranch/1.7/manual">1.7</a></li>
<li><a href="/docs/en/ranch/1.6/manual">1.6</a></li>
<li><a href="/docs/en/ranch/1.5/manual">1.5</a></li>
<li><a href="/docs/en/ranch/1.4/manual">1.4</a></li>
<li><a href="/docs/en/ranch/1.3/manual">1.3</a></li>
<li><a href="/docs/en/ranch/1.2/manual">1.2</a></li>
</ul>
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