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<title>SSL/TLS Strong Encryption: Compatibility - Apache HTTP Server Version 2.5</title>
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/quickreference.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.5</a> > <a href="./">SSL/TLS</a></div><div id="page-content"><div id="preamble"><h1>SSL/TLS Strong Encryption: Compatibility</h1>
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<p><span>Available Languages: </span><a href="../en/ssl/ssl_compat.html" title="English"> en </a> |
<a href="../fr/ssl/ssl_compat.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
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<p>
This page covers backwards compatibility between mod_ssl and other
SSL solutions. mod_ssl is not the only SSL solution for Apache; four
additional products are (or were) also available: Ben Laurie's freely
available <a href="http://www.apache-ssl.org/">Apache-SSL</a> (from
where mod_ssl were originally derived in 1998), Red Hat's commercial
Secure Web Server (which was based on mod_ssl), Covalent's commercial
Raven SSL Module (also based on
mod_ssl) and finally C2Net's (now Red Hat's) commercial product <a href="http://www.redhat.com/explore/stronghold/">Stronghold</a> (based
on a different evolution branch, named Sioux up to Stronghold 2.x, and
based on mod_ssl since Stronghold 3.x).</p>
<p>
mod_ssl mostly provides a superset of the functionality of all the other
solutions, so it's simple to migrate from one of the older modules to
mod_ssl. The configuration directives and environment variable names
used by the older SSL solutions vary from those used in mod_ssl;
mapping tables are included here to give the equivalents used by mod_ssl.</p>
</div>
<div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#configuration">Configuration Directives</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#variables">Environment Variables</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#customlog">Custom Log Functions</a></li>
</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="configuration" id="configuration">Configuration Directives</a></h2>
<p>The mapping between configuration directives used by Apache-SSL
1.x and mod_ssl 2.0.x is given in <a href="#table1">Table
1</a>. The mapping from Sioux 1.x and Stronghold 2.x is only partial
because of special functionality in these interfaces which mod_ssl
doesn't provide.</p>
<h3><a name="table1" id="table1">Table 1: Configuration Directive Mapping</a></h3>
<table><tr class="header"><th>Old Directive</th><th>mod_ssl Directive</th><th>Comment</th></tr>
<tr class="header"><th colspan="3">Apache-SSL 1.x & mod_ssl 2.0.x compatibility:</th></tr>
<tr><td><code>SSLEnable</code></td><td><code>SSLEngine on</code></td><td>compactified</td></tr>
<tr class="odd"><td><code>SSLDisable</code></td><td><code>SSLEngine off</code></td><td>compactified</td></tr>
<tr><td><code>SSLLogFile</code> <em>file</em></td><td><code /></td><td>Use per-module <code class="directive"><a href="../mod/core.html#loglevel">LogLevel</a></code> setting instead.</td></tr>
<tr class="odd"><td><code>SSLRequiredCiphers</code> <em>spec</em></td><td><code>SSLCipherSuite</code> <em>spec</em></td><td>renamed</td></tr>
<tr><td><code>SSLRequireCipher</code> <em>c1</em> ...</td><td><code>SSLRequire %{SSL_CIPHER} in {"</code><em>c1</em><code>",
...}</code></td><td>generalized</td></tr>
<tr class="odd"><td><code>SSLBanCipher</code> <em>c1</em> ...</td><td><code>SSLRequire not (%{SSL_CIPHER} in {"</code><em>c1</em><code>",
...})</code></td><td>generalized</td></tr>
<tr><td><code>SSLFakeBasicAuth</code></td><td><code>SSLOptions +FakeBasicAuth</code></td><td>merged</td></tr>
<tr class="odd"><td><code>SSLCacheServerPath</code> <em>dir</em></td><td>-</td><td>functionality removed</td></tr>
<tr><td><code>SSLCacheServerPort</code> <em>integer</em></td><td>-</td><td>functionality removed</td></tr>
<tr class="header"><th colspan="3">Apache-SSL 1.x compatibility:</th></tr>
<tr class="odd"><td><code>SSLExportClientCertificates</code></td><td><code>SSLOptions +ExportCertData</code></td><td>merged</td></tr>
<tr><td><code>SSLCacheServerRunDir</code> <em>dir</em></td><td>-</td><td>functionality not supported</td></tr>
<tr class="header"><th colspan="3">Sioux 1.x compatibility:</th></tr>
<tr class="odd"><td><code>SSL_CertFile</code> <em>file</em></td><td><code>SSLCertificateFile</code> <em>file</em></td><td>renamed</td></tr>
<tr><td><code>SSL_KeyFile</code> <em>file</em></td><td><code>SSLCertificateKeyFile</code> <em>file</em></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_CipherSuite</code> <em>arg</em></td><td><code>SSLCipherSuite</code> <em>arg</em></td><td>renamed</td></tr>
<tr><td><code>SSL_X509VerifyDir</code> <em>arg</em></td><td><code>SSLCACertificatePath</code> <em>arg</em></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_Log</code> <em>file</em></td><td><code>-</code></td><td>Use per-module <code class="directive"><a href="../mod/core.html#loglevel">LogLevel</a></code> setting instead.</td></tr>
<tr><td><code>SSL_Connect</code> <em>flag</em></td><td><code>SSLEngine</code> <em>flag</em></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_ClientAuth</code> <em>arg</em></td><td><code>SSLVerifyClient</code> <em>arg</em></td><td>renamed</td></tr>
<tr><td><code>SSL_X509VerifyDepth</code> <em>arg</em></td><td><code>SSLVerifyDepth</code> <em>arg</em></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_FetchKeyPhraseFrom</code> <em>arg</em></td><td>-</td><td>not directly mappable; use SSLPassPhraseDialog</td></tr>
<tr><td><code>SSL_SessionDir</code> <em>dir</em></td><td>-</td><td>not directly mappable; use SSLSessionCache</td></tr>
<tr class="odd"><td><code>SSL_Require</code> <em>expr</em></td><td>-</td><td>not directly mappable; use SSLRequire</td></tr>
<tr><td><code>SSL_CertFileType</code> <em>arg</em></td><td>-</td><td>functionality not supported</td></tr>
<tr class="odd"><td><code>SSL_KeyFileType</code> <em>arg</em></td><td>-</td><td>functionality not supported</td></tr>
<tr><td><code>SSL_X509VerifyPolicy</code> <em>arg</em></td><td>-</td><td>functionality not supported</td></tr>
<tr class="odd"><td><code>SSL_LogX509Attributes</code> <em>arg</em></td><td>-</td><td>functionality not supported</td></tr>
<tr class="header"><th colspan="3">Stronghold 2.x compatibility:</th></tr>
<tr><td><code>StrongholdAccelerator</code> <em>engine</em></td><td><code>SSLCryptoDevice</code> <em>engine</em></td><td>renamed</td></tr>
<tr class="odd"><td><code>StrongholdKey</code> <em>dir</em></td><td>-</td><td>functionality not needed</td></tr>
<tr><td><code>StrongholdLicenseFile</code> <em>dir</em></td><td>-</td><td>functionality not needed</td></tr>
<tr class="odd"><td><code>SSLFlag</code> <em>flag</em></td><td><code>SSLEngine</code> <em>flag</em></td><td>renamed</td></tr>
<tr><td><code>SSLSessionLockFile</code> <em>file</em></td><td><code>SSLMutex</code> <em>file</em></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSLCipherList</code> <em>spec</em></td><td><code>SSLCipherSuite</code> <em>spec</em></td><td>renamed</td></tr>
<tr><td><code>RequireSSL</code></td><td><code>SSLRequireSSL</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSLErrorFile</code> <em>file</em></td><td>-</td><td>functionality not supported</td></tr>
<tr><td><code>SSLRoot</code> <em>dir</em></td><td>-</td><td>functionality not supported</td></tr>
<tr class="odd"><td><code>SSL_CertificateLogDir</code> <em>dir</em></td><td>-</td><td>functionality not supported</td></tr>
<tr><td><code>AuthCertDir</code> <em>dir</em></td><td>-</td><td>functionality not supported</td></tr>
<tr class="odd"><td><code>SSL_Group</code> <em>name</em></td><td>-</td><td>functionality not supported</td></tr>
<tr><td><code>SSLProxyMachineCertPath</code> <em>dir</em></td><td><code>SSLProxyMachineCertificatePath</code> <em>dir</em></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSLProxyMachineCertFile</code> <em>file</em></td><td><code>SSLProxyMachineCertificateFile</code> <em>file</em></td><td>renamed</td></tr>
<tr><td><code>SSLProxyCipherList</code> <em>spec</em></td><td><code>SSLProxyCipherSpec</code> <em>spec</em></td><td>renamed</td></tr>
</table>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="variables" id="variables">Environment Variables</a></h2>
<p>The mapping between environment variable names used by the older
SSL solutions and the names used by mod_ssl is given in <a href="#table2">Table 2</a>.</p>
<h3><a name="table2" id="table2">Table 2: Environment Variable Derivation</a></h3>
<table><tr class="header"><th>Old Variable</th><th>mod_ssl Variable</th><th>Comment</th></tr>
<tr><td><code>SSL_PROTOCOL_VERSION</code></td><td><code>SSL_PROTOCOL</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSLEAY_VERSION</code></td><td><code>SSL_VERSION_LIBRARY</code></td><td>renamed</td></tr>
<tr><td><code>HTTPS_SECRETKEYSIZE</code></td><td><code>SSL_CIPHER_USEKEYSIZE</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>HTTPS_KEYSIZE</code></td><td><code>SSL_CIPHER_ALGKEYSIZE</code></td><td>renamed</td></tr>
<tr><td><code>HTTPS_CIPHER</code></td><td><code>SSL_CIPHER</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>HTTPS_EXPORT</code></td><td><code>SSL_CIPHER_EXPORT</code></td><td>renamed</td></tr>
<tr><td><code>SSL_SERVER_KEY_SIZE</code></td><td><code>SSL_CIPHER_ALGKEYSIZE</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_SERVER_CERTIFICATE</code></td><td><code>SSL_SERVER_CERT</code></td><td>renamed</td></tr>
<tr><td><code>SSL_SERVER_CERT_START</code></td><td><code>SSL_SERVER_V_START</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_SERVER_CERT_END</code></td><td><code>SSL_SERVER_V_END</code></td><td>renamed</td></tr>
<tr><td><code>SSL_SERVER_CERT_SERIAL</code></td><td><code>SSL_SERVER_M_SERIAL</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_SERVER_SIGNATURE_ALGORITHM</code></td><td><code>SSL_SERVER_A_SIG</code></td><td>renamed</td></tr>
<tr><td><code>SSL_SERVER_DN</code></td><td><code>SSL_SERVER_S_DN</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_SERVER_CN</code></td><td><code>SSL_SERVER_S_DN_CN</code></td><td>renamed</td></tr>
<tr><td><code>SSL_SERVER_EMAIL</code></td><td><code>SSL_SERVER_S_DN_Email</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_SERVER_O</code></td><td><code>SSL_SERVER_S_DN_O</code></td><td>renamed</td></tr>
<tr><td><code>SSL_SERVER_OU</code></td><td><code>SSL_SERVER_S_DN_OU</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_SERVER_C</code></td><td><code>SSL_SERVER_S_DN_C</code></td><td>renamed</td></tr>
<tr><td><code>SSL_SERVER_SP</code></td><td><code>SSL_SERVER_S_DN_SP</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_SERVER_L</code></td><td><code>SSL_SERVER_S_DN_L</code></td><td>renamed</td></tr>
<tr><td><code>SSL_SERVER_IDN</code></td><td><code>SSL_SERVER_I_DN</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_SERVER_ICN</code></td><td><code>SSL_SERVER_I_DN_CN</code></td><td>renamed</td></tr>
<tr><td><code>SSL_SERVER_IEMAIL</code></td><td><code>SSL_SERVER_I_DN_Email</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_SERVER_IO</code></td><td><code>SSL_SERVER_I_DN_O</code></td><td>renamed</td></tr>
<tr><td><code>SSL_SERVER_IOU</code></td><td><code>SSL_SERVER_I_DN_OU</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_SERVER_IC</code></td><td><code>SSL_SERVER_I_DN_C</code></td><td>renamed</td></tr>
<tr><td><code>SSL_SERVER_ISP</code></td><td><code>SSL_SERVER_I_DN_SP</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_SERVER_IL</code></td><td><code>SSL_SERVER_I_DN_L</code></td><td>renamed</td></tr>
<tr><td><code>SSL_CLIENT_CERTIFICATE</code></td><td><code>SSL_CLIENT_CERT</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_CLIENT_CERT_START</code></td><td><code>SSL_CLIENT_V_START</code></td><td>renamed</td></tr>
<tr><td><code>SSL_CLIENT_CERT_END</code></td><td><code>SSL_CLIENT_V_END</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_CLIENT_CERT_SERIAL</code></td><td><code>SSL_CLIENT_M_SERIAL</code></td><td>renamed</td></tr>
<tr><td><code>SSL_CLIENT_SIGNATURE_ALGORITHM</code></td><td><code>SSL_CLIENT_A_SIG</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_CLIENT_DN</code></td><td><code>SSL_CLIENT_S_DN</code></td><td>renamed</td></tr>
<tr><td><code>SSL_CLIENT_CN</code></td><td><code>SSL_CLIENT_S_DN_CN</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_CLIENT_EMAIL</code></td><td><code>SSL_CLIENT_S_DN_Email</code></td><td>renamed</td></tr>
<tr><td><code>SSL_CLIENT_O</code></td><td><code>SSL_CLIENT_S_DN_O</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_CLIENT_OU</code></td><td><code>SSL_CLIENT_S_DN_OU</code></td><td>renamed</td></tr>
<tr><td><code>SSL_CLIENT_C</code></td><td><code>SSL_CLIENT_S_DN_C</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_CLIENT_SP</code></td><td><code>SSL_CLIENT_S_DN_SP</code></td><td>renamed</td></tr>
<tr><td><code>SSL_CLIENT_L</code></td><td><code>SSL_CLIENT_S_DN_L</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_CLIENT_IDN</code></td><td><code>SSL_CLIENT_I_DN</code></td><td>renamed</td></tr>
<tr><td><code>SSL_CLIENT_ICN</code></td><td><code>SSL_CLIENT_I_DN_CN</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_CLIENT_IEMAIL</code></td><td><code>SSL_CLIENT_I_DN_Email</code></td><td>renamed</td></tr>
<tr><td><code>SSL_CLIENT_IO</code></td><td><code>SSL_CLIENT_I_DN_O</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_CLIENT_IOU</code></td><td><code>SSL_CLIENT_I_DN_OU</code></td><td>renamed</td></tr>
<tr><td><code>SSL_CLIENT_IC</code></td><td><code>SSL_CLIENT_I_DN_C</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_CLIENT_ISP</code></td><td><code>SSL_CLIENT_I_DN_SP</code></td><td>renamed</td></tr>
<tr><td><code>SSL_CLIENT_IL</code></td><td><code>SSL_CLIENT_I_DN_L</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_EXPORT</code></td><td><code>SSL_CIPHER_EXPORT</code></td><td>renamed</td></tr>
<tr><td><code>SSL_KEYSIZE</code></td><td><code>SSL_CIPHER_ALGKEYSIZE</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_SECKEYSIZE</code></td><td><code>SSL_CIPHER_USEKEYSIZE</code></td><td>renamed</td></tr>
<tr><td><code>SSL_SSLEAY_VERSION</code></td><td><code>SSL_VERSION_LIBRARY</code></td><td>renamed</td></tr>
<tr class="odd"><td><code>SSL_STRONG_CRYPTO</code></td><td><code>-</code></td><td>Not supported by mod_ssl</td></tr>
<tr><td><code>SSL_SERVER_KEY_EXP</code></td><td><code>-</code></td><td>Not supported by mod_ssl</td></tr>
<tr class="odd"><td><code>SSL_SERVER_KEY_ALGORITHM</code></td><td><code>-</code></td><td>Not supported by mod_ssl</td></tr>
<tr><td><code>SSL_SERVER_KEY_SIZE</code></td><td><code>-</code></td><td>Not supported by mod_ssl</td></tr>
<tr class="odd"><td><code>SSL_SERVER_SESSIONDIR</code></td><td><code>-</code></td><td>Not supported by mod_ssl</td></tr>
<tr><td><code>SSL_SERVER_CERTIFICATELOGDIR</code></td><td><code>-</code></td><td>Not supported by mod_ssl</td></tr>
<tr class="odd"><td><code>SSL_SERVER_CERTFILE</code></td><td><code>-</code></td><td>Not supported by mod_ssl</td></tr>
<tr><td><code>SSL_SERVER_KEYFILE</code></td><td><code>-</code></td><td>Not supported by mod_ssl</td></tr>
<tr class="odd"><td><code>SSL_SERVER_KEYFILETYPE</code></td><td><code>-</code></td><td>Not supported by mod_ssl</td></tr>
<tr><td><code>SSL_CLIENT_KEY_EXP</code></td><td><code>-</code></td><td>Not supported by mod_ssl</td></tr>
<tr class="odd"><td><code>SSL_CLIENT_KEY_ALGORITHM</code></td><td><code>-</code></td><td>Not supported by mod_ssl</td></tr>
<tr><td><code>SSL_CLIENT_KEY_SIZE</code></td><td><code>-</code></td><td>Not supported by mod_ssl</td></tr>
</table>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="customlog" id="customlog">Custom Log Functions</a></h2>
<p>
When mod_ssl is enabled, additional functions exist for the <a href="../mod/mod_log_config.html#formats">Custom Log Format</a> of
<code class="module"><a href="../mod/mod_log_config.html">mod_log_config</a></code> as documented in the Reference
Chapter. Beside the ``<code>%{</code><em>varname</em><code>}x</code>''
eXtension format function which can be used to expand any variables provided
by any module, an additional Cryptography
``<code>%{</code><em>name</em><code>}c</code>'' cryptography format function
exists for backward compatibility. The currently implemented function calls
are listed in <a href="#table3">Table 3</a>.</p>
<h3><a name="table3" id="table3">Table 3: Custom Log Cryptography Function</a></h3>
<table>
<tr><th>Function Call</th><th>Description</th></tr>
<tr><td><code>%...{version}c</code></td> <td>SSL protocol version</td></tr>
<tr><td><code>%...{cipher}c</code></td> <td>SSL cipher</td></tr>
<tr><td><code>%...{subjectdn}c</code></td> <td>Client Certificate Subject Distinguished Name</td></tr>
<tr><td><code>%...{issuerdn}c</code></td> <td>Client Certificate Issuer Distinguished Name</td></tr>
<tr><td><code>%...{errcode}c</code></td> <td>Certificate Verification Error (numerical)</td></tr>
<tr><td><code>%...{errstr}c</code></td> <td>Certificate Verification Error (string)</td></tr>
</table>
</div></div>
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