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<!DOCTYPE html> <head> <meta charset="utf-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" /> <title>LiteSpeed Web Server Users' Manual - Listeners SSL</title> <meta name="description" content="LiteSpeed Web Server Users' Manual - Listeners SSL." /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <meta name="robots" content="noindex"> <link rel="shortcut icon" href="img/favicon.ico" /> <link rel="stylesheet" type="text/css" href="css/hdoc.css"> </head> <body> <div class="pagewrapper clearfix"><aside class="sidetree ls-col-1-5"> <figure> <img src="img/lsws_logo.svg" alt="lightspeed web server logo" width="100px"/> </figure> <h2 class="ls-text-thin"> LiteSpeed Web Server <br /> <span class="current"><a href="index.html">Users' Manual</a></span> </h2> <h3 class="ls-text-muted">Version 6.3 — Rev. 4</h3> <hr/> <div> <ul> <li><a href="license.html">License Enterprise</a></li> <li><a href="intro.html">Introduction</a></li> <li><a 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href="AdminListeners_General_Help.html"> Admin Listener General </a> </li> <li> <a href="AdminListeners_SSL_Help.html">Admin Listener SSL</a> </li> </ul> </li> </ul> </div> </aside> <article class="contentwrapper ls-col-3-5 clearfix"><div class="nav-bar ls-spacer-micro-top"><div class="prev">« <a href="Listeners_General_Help.html">Listeners General</a></div><div class="center"><a href="config.html">Configuration</a></div><div class="next"><a href="Templates_Help.html">Virtual Host Templates</a> »</div></div> <h1>Listeners SSL</h1><h2 id="top">Table of Contents</h2><section class="toc"><section class="toc-row"><header><a href="#sslCert">SSL Private Key & Certificate</a></header><p> <a href="#keyFile">Private Key File</a> | <a href="#certFile">Certificate File</a> | <a href="#certChain">Chained Certificate</a> | <a href="#CACertPath">CA Certificate Path</a> | <a href="#CACertFile">CA Certificate File</a></p></section> <section class="toc-row"><header>SSL Protocol</header><p> <a href="#sslProtocol">Protocol Version</a> | <a href="#ciphers">Ciphers</a> | <a href="#enableECDHE">Enable ECDH Key Exchange</a> | <a href="#enableDHE">Enable DH Key Exchange</a> | <a href="#DHParam">DH Parameter</a></p></section> <section class="toc-row"><header>Security & Features</header><p> <a href="#renegProtection">SSL Renegotiation Protection</a> | <a href="#sslSessionCache">Enable Session Cache</a> | <a href="#sslSessionTickets">Enable Session Tickets</a> | <a href="#enableSpdy">ALPN</a> | <a href="#allowQuic">Open HTTP3/QUIC (UDP) port</a></p></section> <section class="toc-row"><header><a href="#sslOCSP">OCSP Stapling</a></header><p> <a href="#enableStapling">Enable OCSP Stapling</a> | <a href="#ocspRespMaxAge">OCSP Response Max Age (secs)</a> | <a href="#ocspResponder">OCSP Responder</a> | <a href="#ocspCACerts">OCSP CA Certificates</a></p></section> <section class="toc-row"><header>Client Verification</header><p> <a href="#clientVerify">Client Verification</a> | <a href="#verifyDepth">Verify Depth</a> | <a href="#crlPath">Client Revocation Path</a> | <a href="#crlFile">Client Revocation File</a></p></section> </section> <section><div class="helpitem"><article class="ls-helpitem"><div><header id="sslCert"><h3>SSL Private Key & Certificate<span class="ls-permlink"><a href="#sslCert"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Every SSL listener requires a paired SSL private key and SSL certificate. Multiple SSL listeners can share the same key and certificate.<br/><br/> You can generate SSL private keys yourself using an SSL software package, such as OpenSSL. SSL certificates can also be purchased from an authorized certificate issuer like VeriSign or Thawte. You can also sign the certificate yourself. Self-signed certificates will not be trusted by web browsers and should not be used on public websites containing critical data. However, a self-signed certificate is good enough for internal use, e.g. for encrypting traffic to LiteSpeed Web Server's WebAdmin Console.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="keyFile"><h3>Private Key File<span class="ls-permlink"><a href="#keyFile"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>The filename of the SSL private key file. The key file should not be encrypted.</p> <h4>Syntax</h4><p>Filename which can be an absolute path or a relative path to $SERVER_ROOT.</p> <h4>Tips</h4><p><span title="Security" class="ls-icon-security"></span> The private key file should be placed in a secured directory that allows read-only access to the user the server runs as.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="certFile"><h3>Certificate File<span class="ls-permlink"><a href="#certFile"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>The filename of the SSL certificate file.</p> <h4>Syntax</h4><p>Filename which can be an absolute path or a relative path to $SERVER_ROOT.</p> <h4>Tips</h4><p><span title="Security" class="ls-icon-security"></span> The certificate file should be placed in a secured directory, which allows read-only access to the user that the server runs as.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="certChain"><h3>Chained Certificate<span class="ls-permlink"><a href="#certChain"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies whether the certificate is a chained certificate or not. The file that stores a certificate chain must be in PEM format, and the certificates must be in the chained order, from the lowest level (the actual client or server certificate) to the highest level (root) CA.</p> <h4>Syntax</h4><p>Select from radio box</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="CACertPath"><h3>CA Certificate Path<span class="ls-permlink"><a href="#CACertPath"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the directory where the certificates of certification authorities (CAs) are kept. Those certificates are used for client certificate authentication and constructing the server certificate chain, which will be sent to browsers in addition to the server certificate.</p> <h4>Syntax</h4><p>path</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="CACertFile"><h3>CA Certificate File<span class="ls-permlink"><a href="#CACertFile"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the file that contains all certificates of certification authorities (CAs) for chained certificates. This file is simply the concatenation of PEM-encoded certificate files, in order of preference. This can be used as an alternative or in addition to <span class="tagl"><a href="#CACertPath">CA Certificate Path</a></span>. Those certificates are used for client certificate authentication and constructing the server certificate chain, which will be sent to browsers in addition to the server certificate.</p> <h4>Syntax</h4><p>Filename which can be an absolute path or a relative path to $SERVER_ROOT.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="sslProtocol"><h3>Protocol Version<span class="ls-permlink"><a href="#sslProtocol"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>A selection of SSL protocols accepted by the listener.<br/><br/> Options include: <span class="val">SSL v3.0</span>, <span class="val">TLS v1.0</span>, <span class="val">TLS v1.1</span>, <span class="val">TLS v1.2</span>, <span class="val">TLS v1.3</span>.</p> <h4>Syntax</h4><p>Select from checkbox</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="ciphers"><h3>Ciphers<span class="ls-permlink"><a href="#ciphers"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the cipher suite to be used when negotiating the SSL handshake. LSWS supports cipher suites implemented in SSL v3.0, TLS v1.0, TLS v1.2, and TLS v1.3.</p> <h4>Syntax</h4><p>Colon-separated string of cipher specifications.</p> <h4>Example</h4><div class="ls-example">ECDHE-RSA-AES128-SHA256:RC4:HIGH:!MD5:!aNULL:!EDH</div><h4>Tips</h4><p><span title="Security" class="ls-icon-security"></span> We recommend leaving this field blank to use our default cipher which follows SSL cipher best practices.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="enableECDHE"><h3>Enable ECDH Key Exchange<span class="ls-permlink"><a href="#enableECDHE"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Allows use of Elliptic Curve Diffie-Hellman key exchange for further SSL encryption.</p> <h4>Syntax</h4><p>Select from radio box</p> <h4>Tips</h4><p><span title="Security" class="ls-icon-security"></span> ECDH key exchange is more secure than using just an RSA key. ECDH and DH key exchange are equally secure.<br/><br/> <span title="Performance" class="ls-icon-performance"></span> Enabling ECDH key exchange will increase CPU load and is slower than using just an RSA key.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="enableDHE"><h3>Enable DH Key Exchange<span class="ls-permlink"><a href="#enableDHE"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Allows use of Diffie-Hellman key exchange for further SSL encryption.</p> <h4>Syntax</h4><p>Select from radio box</p> <h4>Tips</h4><p><span title="Security" class="ls-icon-security"></span> DH key exchange is more secure than using just an RSA key. ECDH and DH key exchange are equally secure.<br/><br/> <span title="Performance" class="ls-icon-performance"></span> Enabling DH key exchange will increase CPU load and is slower than ECDH key exchange and RSA. ECDH key exchange is preferred when available.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="DHParam"><h3>DH Parameter<span class="ls-permlink"><a href="#DHParam"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the location of the Diffie-Hellman parameter file necessary for DH key exchange.</p> <h4>Syntax</h4><p>Filename which can be an absolute path or a relative path to $SERVER_ROOT.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="renegProtection"><h3>SSL Renegotiation Protection<span class="ls-permlink"><a href="#renegProtection"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies whether to enable SSL Renegotiation Protection to defend against SSL handshake-based attacks. The default value is "Yes".</p> <h4>Syntax</h4><p>Select from radio box</p> <h4>Tips</h4><p><span title="Information" class="ls-icon-info"></span> This setting can be enabled at the listener and virtual host levels.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="sslSessionCache"><h3>Enable Session Cache<span class="ls-permlink"><a href="#sslSessionCache"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Enables session id caching using OpenSSL's default setting. Default value is "No".</p> <h4>Syntax</h4><p>Select from radio box</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="sslSessionTickets"><h3>Enable Session Tickets<span class="ls-permlink"><a href="#sslSessionTickets"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Enables session tickets using OpenSSL's default session ticket setting. Server-level setting must be set to "Yes" for Virtual Host setting to take effect.<br/><br/> Default values:<br/> <b>Server-level:</b> Yes<br/> <b>VH-Level:</b> Yes</p> <h4>Syntax</h4><p>Select from radio box</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="enableSpdy"><h3>ALPN<span class="ls-permlink"><a href="#enableSpdy"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Selectively enable HTTP/3, HTTP/2, and SPDY HTTP network protocols.<br/><br/> If you wish to disable SPDY, HTTP/2, and HTTP3, check "None" and leave all other boxes unchecked.<br/><br/> Default value: All enabled</p> <h4>Syntax</h4><p>Select from checkbox</p> <h4>Tips</h4><p><span title="Information" class="ls-icon-info"></span> This setting can be set at the listener and virtual host levels.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="allowQuic"><h3>Open HTTP3/QUIC (UDP) port<span class="ls-permlink"><a href="#allowQuic"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Allows the use of the HTTP3/QUIC network protocol for virtual hosts mapped to this listener. For this setting to take effect, <span class="tagl"><a href="ServTuning_Help.html#quicEnable">Enable HTTP3/QUIC</a></span> must also be set to <span class="val">Yes</span> at the server level. Default value is <span class="val">Yes</span>.</p> <h4>Tips</h4><p><span title="Information" class="ls-icon-info"></span> When this setting is set to <span class="val">Yes</span>, HTTP3/QUIC can still be disabled at the virtual host level through the <span class="tagl"><a href="VHSSL_Help.html#vhEnableQuic">Enable HTTP3/QUIC</a></span> setting.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="sslOCSP"><h3>OCSP Stapling<span class="ls-permlink"><a href="#sslOCSP"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Online Certificate Status Protocol (OCSP) is a more efficient method of checking whether a digital certificate is valid. It works by communicating with another server — the OCSP responder — to get verification that the certificate is valid instead of checking through certificate revocation lists (CRL).<br/><br/> OCSP stapling is a further improvement on this protocol, allowing the server to check with the OCSP responder at regular intervals instead of every time a certificate is requested. See the <a href="http://en.wikipedia.org/wiki/OCSP_Stapling" target="_blank" rel="noopener noreferrer">OCSP Wikipedia page</a> for more details.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="enableStapling"><h3>Enable OCSP Stapling<span class="ls-permlink"><a href="#enableStapling"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Determines whether to enable OCSP stapling, a more efficient way of verifying public key certificates.</p> <h4>Syntax</h4><p>Select from radio box</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="ocspRespMaxAge"><h3>OCSP Response Max Age (secs)<span class="ls-permlink"><a href="#ocspRespMaxAge"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>This option sets the maximum allowable age for an OCSP response. If an OCSP response is older than this maximum age, the server will contact the OCSP responder for a new response. The default value is <span class="val">86400</span>. Maximum age can be turned off by setting this value to <span class="val">-1</span>.</p> <h4>Syntax</h4><p>Integer of seconds</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="ocspResponder"><h3>OCSP Responder<span class="ls-permlink"><a href="#ocspResponder"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the URL of the OCSP responder to be used. If not set, the server will attempt to contact the OCSP responder detailed in the certificate authority's issuer certificate. Some issuer certificates may not have an OCSP responder URL specified.</p> <h4>Syntax</h4><p>URL starting with <span class="val">http://</span></p> <h4>Example</h4><div class="ls-example"><span class="val">http://rapidssl-ocsp.geotrust.com </span></div></article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="ocspCACerts"><h3>OCSP CA Certificates<span class="ls-permlink"><a href="#ocspCACerts"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the location of the file where OCSP certificate authority (CA) certificates are stored. These certificates are used to check responses from the OCSP responder (and make sure those responses are not spoofed or otherwise compromised). This file should contain the whole certificate chain. If this file does not contain the root certificate, LSWS should be able to find the root certificate in your system directory without you adding it to the file, but, if this validation fails, you should try adding your root certificate to this file.<br/><br/> This setting is optional. If this setting is not set, the server will automatically check <span class="tagl"><a href="#CACertFile">CA Certificate File</a></span>.</p> <h4>Syntax</h4><p>Filename which can be an absolute path or a relative path to $SERVER_ROOT.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="clientVerify"><h3>Client Verification<span class="ls-permlink"><a href="#clientVerify"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p><span class="tag">Enterprise Edition Only</span> Specifies the type of client certifcate authentication. Available types are: <ul> <li><b>None:</b> No client certificate is required.</li> <li><b>Optional:</b> Client certificate is optional.</li> <li><b>Require:</b> The client must has valid certificate.</li> <li><b>Optional_no_ca:</b> Same as optional.</li> </ul> The default is "None".</p> <h4>Syntax</h4><p>Select from drop down list</p> <h4>Tips</h4><p><span title="Information" class="ls-icon-info"></span> "None" or "Require" are recommended.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="verifyDepth"><h3>Verify Depth<span class="ls-permlink"><a href="#verifyDepth"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p><span class="tag">Enterprise Edition Only</span> Specifies how deeply a certificate should be verified before determining that the client does not have a valid certificate. The default is "1".</p> <h4>Syntax</h4><p>Select from drop down list</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="crlPath"><h3>Client Revocation Path<span class="ls-permlink"><a href="#crlPath"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p><span class="tag">Enterprise Edition Only</span> Specifies the directory containing PEM-encoded CA CRL files for revoked client certificates. The files in this directory have to be PEM-encoded. These files are accessed through hash filenames, hash-value.rN. Please refer to openSSL or Apache mod_ssl documentation regarding creating the hash filename.</p> <h4>Syntax</h4><p>path</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="crlFile"><h3>Client Revocation File<span class="ls-permlink"><a href="#crlFile"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p><span class="tag">Enterprise Edition Only</span> Specifies the file containing PEM-encoded CA CRL files enumerating revoked client certificates. This can be used as an alternative or in addition to <span class="tagl"><a href="#crlPath">Client Revocation Path</a></span>.</p> <h4>Syntax</h4><p>Filename which can be an absolute path or a relative path to $SERVER_ROOT.</p> </article> </div> </section> </article><div class="ls-col-1-1"><footer class="copyright">Copyright © 2003-2020. <a href="https://www.litespeedtech.com">LiteSpeed Technologies Inc.</a> All rights reserved.</footer> </div></div> </body> </html>
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