ssl_howto.html

mod_ssl-2.8.31-1.3.41.tar.gz 好用的ssl工具

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        <td rowspan="3">&nbsp;&nbsp;<font face="Arial,Helvetica" color="#999999">httpd.conf</font>&nbsp;&nbsp;</td>
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<pre>

SSLProtocol -all +SSLv2
SSLCipherSuite SSLv2:+HIGH:+MEDIUM:+LOW:+EXP

</pre>
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<p>
<li><a name="ToC3"></a>
    <a name="cipher-strong"></a>
    <strong id="howto">
How can I create an SSL server which accepts strong encryption only?
</strong>&nbsp;&nbsp;
    [<a href="http://www.modssl.org/docs/2.8/ssl_howto.html#cipher-strong"><b>L</b></a>]
    <p>
The following enables only the seven strongest ciphers:
<p>
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        <td rowspan="3">&nbsp;&nbsp;<font face="Arial,Helvetica" color="#999999">httpd.conf</font>&nbsp;&nbsp;</td>
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<pre>

SSLProtocol all
SSLCipherSuite HIGH:MEDIUM

</pre>
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<p>
<li><a name="ToC4"></a>
    <a name="cipher-sgc"></a>
    <strong id="howto">
How can I create an SSL server which accepts strong encryption only,
but allows export browsers to upgrade to stronger encryption?
</strong>&nbsp;&nbsp;
    [<a href="http://www.modssl.org/docs/2.8/ssl_howto.html#cipher-sgc"><b>L</b></a>]
    <p>
This facility is called Server Gated Cryptography (SGC) and details you can
find in the <code>README.GlobalID</code> document in the mod_ssl distribution.
In short: The server has a Global ID server certificate, signed by a special
CA certificate from Verisign which enables strong encryption in export
browsers. This works as following: The browser connects with an export cipher,
the server sends it's Global ID certificate, the browser verifies it and
subsequently upgrades the cipher suite before any HTTP communication takes
place. The question now is: How can we allow this upgrade, but enforce strong
encryption. Or in other words: Browser either have to initially connect with
strong encryption or have to upgrade to strong encryption, but are not allowed
to keep the export ciphers. The following does the trick:
<p>
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        <td rowspan="3">&nbsp;&nbsp;<font face="Arial,Helvetica" color="#999999">httpd.conf</font>&nbsp;&nbsp;</td>
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<pre>

#   allow all ciphers for the inital handshake,
#   so export browsers can upgrade via SGC facility
SSLCipherSuite ALL:!ADH:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP:+eNULL
&lt;Directory /usr/local/apache/htdocs&gt;
#   but finally deny all browsers which haven't upgraded
SSLRequire %{SSL_CIPHER_USEKEYSIZE} &gt;= 128
&lt;/Directory&gt;

</pre>
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<p>
<li><a name="ToC5"></a>
    <a name="cipher-perdir"></a>
    <strong id="howto">
How can I create an SSL server which accepts all types of ciphers in general,
but requires a strong ciphers for access to a particular URL?
</strong>&nbsp;&nbsp;
    [<a href="http://www.modssl.org/docs/2.8/ssl_howto.html#cipher-perdir"><b>L</b></a>]
    <p>
Obviously you cannot just use a server-wide <code>SSLCipherSuite</code> which
restricts the ciphers to the strong variants. But mod_ssl allows you to
reconfigure the cipher suite in per-directory context and automatically forces
a renegotiation of the SSL parameters to meet the new configuration. So, the
solution is:
<p>
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        <td rowspan="3">&nbsp;&nbsp;<font face="Arial,Helvetica" color="#999999">httpd.conf</font>&nbsp;&nbsp;</td>
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<pre>

#   be liberal in general
SSLCipherSuite ALL:!ADH:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP:+eNULL
&lt;Location /strong/area&gt;
#   but https://hostname/strong/area/ and below requires strong ciphers
SSLCipherSuite HIGH:MEDIUM
&lt;/Location&gt;

</pre>
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</ul>
<h2><a name="ToC6">Client Authentication and Access Control</a></h2>
<ul>
<p>
<li><a name="ToC7"></a>
    <a name="auth-simple"></a>
    <strong id="howto">
How can I authenticate clients based on certificates when I know all my
clients?
</strong>&nbsp;&nbsp;
    [<a href="http://www.modssl.org/docs/2.8/ssl_howto.html#auth-simple"><b>L</b></a>]
    <p>
When you know your user community (i.e. a closed user group situation), as
it's the case for instance in an Intranet, you can use plain certificate
authentication. All you have to do is to create client certificates signed by
your own CA certificate <code>ca.crt</code> and then verifiy the clients
against this certificate.
<p>
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<pre>

#   require a client certificate which has to be directly
#   signed by our CA certificate in ca.crt
SSLVerifyClient require
SSLVerifyDepth 1
SSLCACertificateFile conf/ssl.crt/ca.crt

</pre>
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<p>
<li><a name="ToC8"></a>
    <a name="auth-selective"></a>
    <strong id="howto">
How can I authenticate my clients for a particular URL based on certificates
but still allow arbitrary clients to access the remaining parts of the server?
</strong>&nbsp;&nbsp;
    [<a href="http://www.modssl.org/docs/2.8/ssl_howto.html#auth-selective"><b>L</b></a>]
    <p>
For this we again use the per-directory reconfiguration feature of mod_ssl:
<p>
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<pre>

SSLVerifyClient none
SSLCACertificateFile conf/ssl.crt/ca.crt
&lt;Location /secure/area&gt;
SSLVerifyClient require
SSLVerifyDepth 1
&lt;/Location&gt;

</pre>
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