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-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.1//EN"
-"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
-<refentry>
-  <refentryinfo>
-    <date>2009-03-12</date>
-  </refentryinfo>
-  <refmeta>
-    <refentrytitle>
-      <application>radsecproxy.conf</application>
-    </refentrytitle>
-    <manvolnum>5</manvolnum>
-    <refmiscinfo>radsecproxy devel 2009-03-12</refmiscinfo>
-  </refmeta>
-  <refnamediv>
-    <refname>
-      <application>radsecproxy.conf</application>
-    </refname>
-    <refpurpose>
-Radsec proxy configuration file
-    </refpurpose>
-  </refnamediv>
-  <refsect1>
-    <title>Description</title>
-    <para>
-When the proxy server starts, it will first check the command line arguments,
-and then read the configuration file. Normally radsecproxy will read the
-configuration file <filename>/etc/radsecproxy.conf</filename>. The command
-line <option>-c</option> option can be used to instead read an alternate
-file (see
-      <citerefentry>
-        <refentrytitle>radsecproxy</refentrytitle>
-        <manvolnum>1</manvolnum>
-      </citerefentry>
-for details).
-    </para>
-    <para>
-    If the configuration file can not be found, the proxy will exit with an
-    error message. Note that there is also an include facility so that any
-    configuration file may include other configuration files. The proxy will
-    also exit on configuration errors.
-    </para>
-  </refsect1>
-  <refsect1>
-    <title>Configuration Syntax</title>
-    <para>
-When the configuration file is processed, whitespace (spaces and tabs) are
-generally ignored. For each line, leading and trailing whitespace are ignored.
-A line is ignored if it is empty, only consists of whitespace, or if the first 
-non-whitespace character is a <literal>#</literal>. The configuration is
-generally case insensitive, but in some cases the option values (see below)
-are not.
-    </para>
-    <para>
-There are two types of configuration structures than can be used. The first
-and simplest are lines on the format <emphasis>option value</emphasis>. That
-is, an option name, see below for a list of valid options, followed by
-whitespace (at least one space or tab character), followed by a value. Note
-that if the value contains whitespace, then it must be quoted using
-<literal>""</literal> or <literal>''</literal>. Any whitespace
-in front of the option or after the value will be ignored.
-    </para>
-    <para>
-The other type of structure is a block. A block spans at least two lines, and
-has the format:
-      <blockquote>
-<literallayout>
-blocktype name {
-    option value
-    option value
-    ...
-}
-</literallayout>
-      </blockquote>
-That is, some blocktype, see below for a list of the different block types, and
-then enclosed in braces you have zero or more lines that each have the
-previously described <emphasis>option value</emphasis> format. Different block
-types have different rules for which options can be specified, they are listed
-below. The rules regarding white space, comments and quotes are as above. Hence
-you may do things like:
-      <blockquote>
-        <para>
-<literallayout>
-blocktype name {
-#    option value
-    option "value with space"
-    ...
-}
-</literallayout>
-        </para>
-      </blockquote>
-    </para>
-    <para>
-Option value characters can also be written in hex. This is done by writing the
-character <literal>%</literal> followed by two hexadecimal digits. If a
-<literal>%</literal> is used without two following hexadecimal digits, the
-<literal>%</literal> and the following characters are used as written. If you
-want to write a <literal>%</literal> and not use this decoding, you may of
-course write <literal>%</literal> in hex; i.e., <literal>%25</literal>.
-    </para>
-    <para>
-There is one special option that can be used both as a basic option and inside
-all blocks. That is the option <literal>include</literal> where the value
-specifies files to be included. The value can be a single file, or it can use
-normal shell globbing to specify multiple files, e.g.:
-      <blockquote>
-        <para>
-include /etc/radsecproxy.conf.d/*.conf
-        </para>
-      </blockquote>
-The files are sorted alphabetically. Included files are read in the order they
-are specified, when reaching the end of a file, the next file is read. When
-reaching the end of the last included file, the proxy returns to read the next
-line following the <literal>include</literal> option. Included files may again
-include other files.
-    </para>
-  </refsect1>
-  <refsect1>
-    <title>Basic Options</title>
-    <para>
-The following basic options may be specified in the configuration file. Note
-that blocktypes and options inside blocks are discussed later. Note that none
-of these options are required, and indeed in many cases they are not needed.
-Note that you should specify each at most once. The behaviour with multiple
-occurences is undefined.
-    </para>
-    <variablelist>
-      <varlistentry>
-        <term><literal>logLevel</literal></term>
-        <listitem>
-	  <para>
-This option specifies the debug level. It must be set to 1, 2, 3, 4 or 5, where
-1 logs only serious errors, and 5 logs everything. The default is 2 which logs
-errors, warnings and a few informational messages. Note that the command line
-option <option>-d</option> overrides this.
-	  </para>
-        </listitem>
-      </varlistentry>
-      <varlistentry>
-        <term><literal>logDestination</literal></term>
-        <listitem>
-	  <para>
-This specifies where the log messages should go. By default the messages go to
-syslog with facility <literal>LOG_DAEMON</literal>. Using this option you can
-specify another syslog facility, or you may specify that logging should be to
-a particular file, not using syslog. The value must be either a file or
-syslog URL. The file URL is the standard one, specifying a local file that
-should be used. For syslog, you must use the syntax:
-<literal>x-syslog:///FACILITY</literal> where <literal>FACILITY</literal> must
-be one of <literal>LOG_DAEMON</literal>, <literal>LOG_MAIL</literal>,
-<literal>LOG_USER</literal>, <literal>LOG_LOCAL0</literal>,
-<literal>LOG_LOCAL1</literal>, <literal>LOG_LOCAL2</literal>,
-<literal>LOG_LOCAL3</literal>, <literal>LOG_LOCAL4</literal>,
-<literal>LOG_LOCAL5</literal>, <literal>LOG_LOCAL6</literal> or
-<literal>LOG_LOCAL7</literal>. You may omit the facility from the URL to
-specify logging to the default facility, but this is not very useful since
-this is the default log destination. Note that this option is ignored if
-<option>-f</option> is specified on the command line.
-	  </para>
-        </listitem>
-      </varlistentry>
-      <varlistentry>
-        <term><literal>listenUDP</literal></term>
-        <listitem>
-	  <para>
-Normally the proxy will listen to the standard RADIUS UDP port
-<literal>1812</literal> if configured to handle UDP clients. On most systems it
-will do this for all of the system's IP addresses (both IPv4 and IPv6). On some
-systems however, it may respond to only IPv4 or only IPv6. To specify an
-alternate port you may use a value on the form <literal>*:port</literal> where
-port is any valid port number. If you also want to specify a specific address
-you can do e.g. <literal>192.168.1.1:1812</literal> or
-<literal>[2001:db8::1]:1812</literal>. The port may be omitted if you want the
-default one (like in these examples). These examples are equivalent to
-<literal>192.168.1.1</literal> and <literal>2001:db8::1</literal>. Note that
-you must use brackets around the IPv6 address.
-This option may be specified multiple times to listen to multiple addresses
-and/or ports.
-	  </para>
-        </listitem>
-      </varlistentry>
-      <varlistentry>
-        <term><literal>listenTCP</literal></term>
-        <listitem>
-	  <para>
-This option is similar to the <literal>listenUDP</literal> option, except
-that it is used for receiving connections from TCP clients. The default port
-number is <literal>1812</literal>.
-	  </para>
-        </listitem>
-      </varlistentry>
-      <varlistentry>
-        <term><literal>listenTLS</literal></term>
-        <listitem>
-	  <para>
-This is similar to the <literal>listenUDP</literal> option, except that it is
-used for receiving connections from TLS clients. The default port number is
-<literal>2083</literal>. Note that this option was previously called
-<literal>listenTCP</literal>.
-	  </para>
-        </listitem>
-      </varlistentry>
-      <varlistentry>
-        <term><literal>listenDTLS</literal></term>
-        <listitem>
-	  <para>
-This is similar to the <literal>listenUDP</literal> option, except that it is
-used for receiving connections from DTLS clients. The default port number is 
-<literal>2083</literal>.
-	  </para>
-        </listitem>
-      </varlistentry>
-      <varlistentry>
-        <term><literal>sourceUDP</literal></term>
-        <listitem>
-	  <para>
-This can be used to specify source address and/or source port that the proxy
-will use for sending UDP client messages (e.g. Access Request).
-	  </para>
-        </listitem>
-      </varlistentry>
-      <varlistentry>
-        <term><literal>sourceTCP</literal></term>
-        <listitem>
-	  <para>
-This can be used to specify source address and/or source port that the proxy
-will use for TCP connections.
-	  </para>
-        </listitem>
-      </varlistentry>
-      <varlistentry>
-        <term><literal>sourceTLS</literal></term>
-        <listitem>
-	  <para>
-This can be used to specify source address and/or source port that the proxy
-will use for TLS connections.
-	  </para>
-        </listitem>
-      </varlistentry>
-      <varlistentry>
-        <term><literal>sourceDTLS</literal></term>
-        <listitem>
-	  <para>
-This can be used to specify source address and/or source port that the proxy
-will use for DTLS connections.
-	  </para>
-        </listitem>
-      </varlistentry>
-      <varlistentry>
-        <term><literal>TTLAttribute</literal></term>
-        <listitem>
-	  <para>
-This can be used to change the default TTL attribute. Only change this if
-you know what you are doing. The syntax is either a numerical value
-denoting the TTL attribute, or two numerical values separated by column
-specifying a vendor attribute, i.e. <literal>vendorid:attribute</literal>.
-	  </para>
-        </listitem>
-      </varlistentry>
-      <varlistentry>
-        <term><literal>addTTL</literal></term>
-        <listitem>
-	  <para>
-If a TTL attribute is present, the proxy will decrement the value and
-discard the message if zero. Normally the proxy does nothing if no TTL
-attribute is present. If you use the addTTL option with a value 1-255,
-the proxy will when forwarding a message with no TTL attribute, add one
-with the specified value. Note that this option can also be specified
-for a client/server. It will then override this setting when forwarding
-a message to that client/server.
-	  </para>
-        </listitem>
-      </varlistentry>
-      <varlistentry>
-        <term><literal>loopPrevention</literal></term>
-        <listitem>
-	  <para>
-This can be set to <literal>on</literal> or <literal>off</literal> with
-<literal>off</literal> being the default. When this is enabled, a request
-will never be sent to a server named the same as the client it was received
-from. I.e., the names of the client block and the server block are compared.
-Note that this only gives limited protection against loops.
-It can be used as a basic option and inside server blocks where it overrides
-the basic setting.
-	  </para>
-        </listitem>
-      </varlistentry>
-      <varlistentry>
-        <term><literal>include</literal></term>
-        <listitem>
-	  <para>
-This is not a normal configuration option; it can be specified multiple times.
-It can both be used as a basic option and inside blocks. For the full
-description, see the configuration syntax section above.
-	  </para>
-        </listitem>
-      </varlistentry>
-    </variablelist>
-  </refsect1>
-  <refsect1>
-    <title>Blocks</title>
-    <para>
-There are five types of blocks, they are <literal>client</literal>,
-<literal>server</literal>, <literal>realm</literal>, <literal>tls</literal>
-and <literal>rewrite</literal>. At least one instance of each of
-<literal>client</literal> and <literal>realm</literal> is required. This is
-necessary for the proxy to do anything useful, and it will exit if not. The
-<literal>tls</literal> block is required if at least one TLS/DTLS client or
-server is configured. Note that there can be multiple blocks for each type.
-For each type, the block names should be unique. The behaviour with multiple
-occurences of the same name for the same block type is undefined. Also note
-that some block option values may reference a block by name, in which case
-the block name must be previously defined. Hence the order of the blocks may
-be significant.
-    </para>
-  </refsect1>
-  <refsect1>
-    <title>Client Block</title>
-    <para>
-The client block is used to configure a client. That is, tell the proxy about a
-client, and what parameters should be used for that client. The name of the
-client block must (with one exception, see below) be either the IP address
-(IPv4 or IPv6) of the client, an IP prefix (IPv4 or IPv6) on the form
-IpAddress/PrefixLength, or a domain name (FQDN). Note that literal IPv6
-addresses must be enclosed in brackets.
-    </para>
-    <para>
-If a domain name is specified, then this will be resolved immediately to all
-the addresses associated with the name, and the proxy will not care about any
-possible DNS changes that might occur later. Hence there is no dependency on
-DNS after startup.
-    </para>
-    <para>
-When some client later sends a request to the proxy, the proxy will look at the
-IP address the request comes from, and then go through all the addresses of
-each of the configured clients (in the order they are defined), to determine
-which (if any) of the clients this is.
-    </para>
-    <para>
-In the case of TLS/DTLS, the name of the client must match the FQDN or IP
-address in the client certificate. Note that this is not required when the
-client name is an IP prefix.
-    </para>
-    <para>
-Alternatively one may use the <literal>host</literal> option inside a client
-block. In that case, the value of the <literal>host</literal> option is used as
-above, while the name of the block is only used as a descriptive name for the
-administrator. The host option may be used multiple times, and can be a mix of
-addresses, FQDNs and prefixes.
-    </para>
-    <para>
-The allowed options in a client block are <literal>host</literal>,
-<literal>type</literal>, <literal>secret</literal>, <literal>tls</literal>,
-<literal>certificateNameCheck</literal>,
-<literal>matchCertificateAttribute</literal>,
-<literal>duplicateInterval</literal>, <literal>addTTL</literal>,
-<literal>rewrite</literal>, <literal>rewriteIn</literal>,
-<literal>rewriteOut</literal> and <literal>rewriteAttribute</literal>.
-We already discussed the
-<literal>host</literal> option. The value of <literal>type</literal> must be
-one of <literal>udp</literal>, <literal>tcp</literal>, <literal>tls</literal>
-or <literal>dtls</literal>. The value of <literal>secret</literal> is the
-shared RADIUS key used with this client. If the secret contains whitespace,
-the value must be quoted. This option is optional for TLS/DTLS.
-    </para>
-    <para>
-For a TLS/DTLS client you may also specify the <literal>tls</literal> option.
-The option value must be the name of a previously defined TLS block. If this
-option is not specified, the TLS block with the name
-<literal>defaultClient</literal> will be used if defined. If not defined, it
-will try to use the TLS block named <literal>default</literal>. If the
-specified TLS block name does not exist, or the option is not specified and
-none of the defaults exist, the proxy will exit with an error.
-    </para>
-    <para>
-For a TLS/DTLS client, the option <literal>certificateNameCheck</literal>
-can be set
-to <literal>off</literal>, to disable the default behaviour of matching CN or
-SubjectAltName against the specified hostname or IP address.
-    </para>
-    <para>
-Additional validation of certificate attributes can be done by use of the
-<literal>matchCertificateAttribute</literal> option. Currently one can only do
-some matching of CN and SubjectAltName. For regexp matching on CN, one can use
-the value <literal>CN:/regexp/</literal>. For SubjectAltName one can only do
-regexp matching of the URI, this is specified as
-<literal>SubjectAltName:URI:/regexp/</literal>. Note that currently this option
-can only be specified once in a client block.
-    </para>
-    <para>
-The <literal>duplicateInterval</literal> option can be used to specify for how
-many seconds duplicate checking should be done. If a proxy receives a new
-request within a few seconds of a previous one, it may be treated the same if
-from the same client, with the same authenticator etc. The proxy will then
-ignore the new request (if it is still processing the previous one), or
-returned a copy of the previous reply.
-    </para>
-    <para>
-The <literal>addTTL</literal> option is similar to the
-<literal>addTTL</literal> option used in the basic config. See that for
-details. Any value configured here overrides the basic one when sending
-messages to this client.
-    </para>
-    <para>
-The <literal>rewrite</literal> option is deprecated. Use
-<literal>rewriteIn</literal> instead.
-    </para>
-    <para>
-The <literal>rewriteIn</literal> option can be used to refer to a rewrite block
-that specifies certain rewrite operations that should be performed on incoming
-messages from the client. The rewriting is done before other processing.
-For details, see the rewrite block text below. Similarly to
-<literal>tls</literal> discussed above, if this option is not used, there is a
-fallback to using the <literal>rewrite</literal> block named
-<literal>defaultClient</literal> if it exists; and if not, a fallback to a
-block named <literal>default</literal>.
-    </para>
-    <para>
-The <literal>rewriteOut</literal> option is used in the same way as
-<literal>rewriteIn</literal>, except that it specifies rewrite operations that
-should be performed on outgoing messages to the client. The rewriting is done
-after other processing. Also, there is no rewrite fallback if this option is
-not used.
-    </para>
-    <para>
-The <literal>rewriteAttribute</literal> option currently makes it possible to
-specify that the User-Name attribute in a client request shall be rewritten in
-the request sent by the proxy. The User-Name attribute is written back to the
-original value if a matching response is later sent back to the client. The
-value must be on the form User-Name:/regexpmatch/replacement/. Example usage:
-      <blockquote>
-        <para>
-rewriteAttribute User-Name:/^(.*)@local$/\1@example.com/
-        </para>
-      </blockquote>
-    </para>
-  </refsect1>
-  <refsect1>
-    <title>Server Block</title>
-    <para>
-The server block is used to configure a server. That is, tell the proxy about a
-server, and what parameters should be used when communicating with that server.
-The name of the server block must (with one exception, see below) be either the
-IP address (IPv4 or IPv6) of the server, or a domain name (FQDN). If a domain
-name is specified, then this will be resolved immediately to all the addresses
-associated with the name, and the proxy will not care about any possible DNS
-changes that might occur later. Hence there is no dependency on DNS after
-startup. If the domain name resolves to multiple addresses, then for UDP/DTLS
-the first address is used. For TCP/TLS, the proxy will loop through the
-addresses until it can connect to one of them. In the case of TLS/DTLS, the
-name of the server must match the FQDN or IP address in the server certificate.
-    </para>
-    <para>
-Alternatively one may use the <literal>host</literal> option inside a server
-block. In that case, the value of the <literal>host</literal> option is used as
-above, while the name of the block is only used as a descriptive name for the
-administrator. Note that multiple host options may be used. This will then be
-treated as multiple names/addresses for the same server. When initiating a TCP/TLS
-connection, all addresses of all names may be attempted, but there is no failover
-between the different host values. For failover one must use separate server
-blocks.
-    </para>
-    <para>
-Note that the name of the block, or values of host options may include a
-port number (separated with a column). This port number will then override the
-default port or a port option in the server block. Also note that literal IPv6
-addresses must be enclosed in brackets.
-    </para>
-    <para>
-The allowed options in a server block are <literal>host</literal>,
-<literal>port</literal>, <literal>type</literal>, <literal>secret</literal>,
-<literal>tls</literal>, <literal>certificateNameCheck</literal>,
-<literal>matchCertificateAttribute</literal>, <literal>addTTL</literal>,
-<literal>rewrite</literal>,
-<literal>rewriteIn</literal>, <literal>rewriteOut</literal>,
-<literal>statusServer</literal>, <literal>retryCount</literal>,
-<literal>retryInterval</literal>, <literal>dynamicLookupCommand</literal>
-and <literal>loopPrevention</literal>.
-    </para>
-    <para>
-We already discussed the <literal>host</literal> option. The
-<literal>port</literal> option allows you to specify which port number the
-server uses. The usage of <literal>type</literal>, <literal>secret</literal>,
-<literal>tls</literal>, <literal>certificateNameCheck</literal>,
-<literal>matchCertificateAttribute</literal>, <literal>addTTL</literal>,
-<literal>rewrite</literal>,
-<literal>rewriteIn</literal> and <literal>rewriteOut</literal> are just as
-specified for the <literal>client block</literal> above, except that
-<literal>defaultServer</literal> (and not <literal>defaultClient</literal>)
-is the fallback for the <literal>tls</literal>, <literal>rewrite</literal>
-and <literal>rewriteIn</literal> options.
-    </para>
-    <para>
-<literal>statusServer</literal> can be specified to enable the use of
-status-server messages for this server. The value must be either
-<literal>on</literal> or <literal>off</literal>. The default when not
-specified, is <literal>off</literal>. If statusserver is enabled, the proxy
-will during idle periods send regular status-server messages to the server
-to verify that it is alive. This should only be enabled if the server
-supports it.
-    </para>
-    <para>
-The options <literal>retryCount</literal> and
-<literal>retryInterval</literal> can be used to specify how many times the
-proxy should retry sending a request and how long it should wait between each
-retry. The defaults are 2 retries and an interval of 5s.
-    </para>
-    <para>
-The option <literal>dynamicLookupCommand</literal> can be used to specify a
-command that should be executed to dynamically configure and use a server.
-The use of this feature will be documented separately/later.
-    </para>
-    <para>
-Using the <literal>loopPrevention</literal> option here overrides any
-basic setting of this option.  See section <literal>BASIC
-OPTIONS</literal> for details on this option.
-    </para>
-  </refsect1>
-  <refsect1>
-    <title>Realm Block</title>
-    <para>
-When the proxy receives an Access-Request it needs to figure out to which
-server it should be forwarded. This is done by looking at the Username attribute
-in the request, and matching that against the names of the defined realm blocks.
-The proxy will match against the blocks in the order they are specified, using
-the first match if any. If no realm matches, the proxy will simply ignore the
-request. Each realm block specifies what the server should do when a match is
-found. A realm block may contain none, one or multiple <literal>server</literal>
-options, and similarly <literal>accountingServer</literal> options. There are
-also <literal>replyMessage</literal> and <literal>accountingResponse</literal>
-options. We will discuss these later.
-    </para>
-    <refsect2>
-      <title>Realm block names and matching</title>
-      <para>
-In the general case the proxy will look for a <literal>@</literal> in the
-username attribute, and try to do an exact case insensitive match between what
-comes after the <literal>@</literal> and the name of the realm block. So if you
-get a request with the attribute value <literal>anonymous@example.com</literal>,
-the proxy will go through the realm names in the order they are specified,
-looking for a realm block named <literal>example.com</literal>.
-      </para>
-      <para>
-There are two exceptions to this, one is the realm name <literal>*</literal>
-which means match everything. Hence if you have a realm block named
-<literal>*</literal>, then it will always match. This should then be the last
-realm block defined, since any blocks after this would never be checked. This
-is useful for having a default.
-      </para>
-      <para>
-The other exception is regular expression matching. If the realm name starts
-with a <literal>/</literal>, the name is treated as an regular expression. A
-case insensitive regexp match will then be done using this regexp on the value
-of the entire Username attribute. Optionally you may also have a trailing
-<literal>/</literal> after the regexp. So as an example, if you want to use
-regexp matching the domain <literal>example.com</literal> you could have a
-realm block named <literal>/@example\\.com$</literal>. Optinally this can also
-be written <literal>/@example\\.com$/</literal>. If you want to match all
-domains under the <literal>.com</literal> top domain, you could do
-<literal>/@.*\\.com$</literal>. Note that since the matching is done on the
-entire attribute value, you can also use rules like
-<literal>/^[a-k].*@example\\.com$/</literal> to get some of the users in this
-domain to use one server, while other users could be matched by another realm
-block and use another server.
-    </para>
-    </refsect2>
-    <refsect2>
-      <title>Realm block options</title>
-      <para>
-A realm block may contain none, one or multiple <literal>server</literal>
-options. If defined, the values of the <literal>server</literal> options must
-be the names of previously defined server blocks. Normally requests will be
-forwarded to the first server option defined. If there are multiple server
-options, the proxy will do fail-over and use the second server if the first
-is down. If the two first are down, it will try the third etc. If say the
-first server comes back up, it will go back to using that one. Currently
-detection of servers being up or down is based on the use of StatusServer (if
-enabled), and that TCP/TLS/DTLS connections are up.
-      </para>
-      <para>
-A realm block may also contain none, one or multiple
-<literal>accountingServer</literal> options. This is used exactly like the
-<literal>server</literal> option, except that it is used for specifying where
-to send matching accounting requests. The values must be the names of
-previously defined server blocks. When multiple accounting servers are
-defined, there is a failover mechanism similar to the one for the
-<literal>server</literal> option.
-      </para>
-      <para>
-If there is no <literal>server</literal> option, the proxy will if
-<literal>replyMessage</literal> is specified, reply back to the client with
-an Access Reject message. The message contains a replyMessage attribute with
-the value as specified by the <literal>replyMessage</literal> option. Note
-that this is different from having no match since then the request is simply
-ignored. You may wonder why this is useful. One example is if you handle say
-all domains under say <literal>.bv</literal>. Then you may have several realm
-blocks matching the domains that exists, while for other domains under
-<literal>.bv</literal> you want to send a reject. At the same time you might
-want to send all other requests to some default server. After the realms for
-the subdomains, you would then have two realm definitions. One with the name
-<literal>/@.*\\.bv$</literal> with no servers, followed by one with the name
-<literal>*</literal> with the default server defined. This may also be useful
-for blocking particular usernames.
-      </para>
-      <para>
-If there is no <literal>accountingServer</literal> option, the proxy will
-normally do nothing, ignoring accounting requests. There is however an option
-called <literal>accountingResponse</literal>. If this is set to
-<literal>on</literal>, the proxy will log some of the accounting information
-and send an Accounting-Response back. This is useful if you do not care much
-about accounting, but want to stop clients from retransmitting accounting
-requests. By default this option is set to <literal>off</literal>.
-      </para>
-    </refsect2>
-  </refsect1>
-  <refsect1>
-    <title>TLS Block</title>
-    <para>
-The TLS block specifies TLS configuration options and you need at least one
-of these if you have clients or servers using TLS/DTLS. As discussed in the
-client and server block descriptions, a client or server block may reference
-a particular TLS block by name. There are also however the special TLS block
-names <literal>default</literal>, <literal>defaultClient</literal> and
-<literal>defaultServer</literal> which are used as defaults if the client or
-server block does not reference a TLS block. Also note that a TLS block must
-be defined before the client or server block that would use it. If you want
-the same TLS configuration for all TLS/DTLS clients and servers, you need
-just a single tls block named <literal>default</literal>, and the client and
-servers need not refer to it. If you want all TLS/DTLS clients to use one
-config, and all TLS/DTLS servers to use another, then you would be fine only
-defining two TLS blocks named <literal>defaultClient</literal> and
-<literal>defaultServer</literal>. If you want different clients (or different
-servers) to have different TLS parameters, then you may need to create other
-TLS blocks with other names, and reference those from the client or server
-definitions. Note that you could also have say a client block refer to a
-default, even <literal>defaultServer</literal> if you really want to.
-    </para>
-    <para>
-The available TLS block options are <literal>CACertificateFile</literal>,
-<literal>CACertificatePath</literal>, <literal>certificateFile</literal>,
-<literal>certificateKeyFile</literal>,
-<literal>certificateKeyPassword</literal>, <literal>cacheExpiry</literal>,
-<literal>CRLCheck</literal> and <literal>policyOID</literal>.
-When doing RADIUS over TLS/DTLS, both the
-client and the server present certificates, and they are both verified by
-the peer. Hence you must always specify <literal>certificateFile</literal>
-and <literal>certificateKeyFile</literal> options, as well as
-<literal>certificateKeyPassword</literal> if a password is needed to decrypt
-the private key. Note that <literal>CACertificateFile</literal> may be a
-certificate chain. In order to verify certificates, or send a chain of
-certificates to a peer, you also always need to specify
-<literal>CACertificateFile</literal> or <literal>CACertificatePath</literal>.
-Note that you may specify both, in which case the certificates in
-<literal>CACertificateFile</literal> are checked first. By default CRLs are
-not checked. This can be changed by setting <literal>CRLCheck</literal> to
-<literal>on</literal>. One can require peer certificates to adhere to certain
-policies by specifying one or multiple policyOIDs using one or multiple
-<literal>policyOID</literal> options.
-    </para>
-    <para>
-CA certificates and CRLs are normally cached permanently. That is, once a CA
-or CRL has been read, the proxy will never attempt to re-read it. CRLs may
-change relatively often and the proxy should ideally always use the latest
-CRLs. Rather than restarting the proxy, there is an option
-<literal>cacheExpiry</literal> that specifies how many seconds the CA and
-CRL information should be cached. Reasonable values might be say 3600
-(1 hour) or 86400 (24 hours), depending on how frequently CRLs are updated
-and how critical it is to be up to date. This option may be set to zero to
-disable caching.
-    </para>
-  </refsect1>
-  <refsect1>
-    <title>Rewrite Block</title>
-    <para>
-The rewrite block specifies rules that may rewrite RADIUS messages. It can be
-used to add, remove and modify specific attributes from messages received
-from and sent to clients and servers. As discussed in the client and server
-block descriptions, a client or server block may reference a particular
-rewrite block by name. There are however also the special rewrite block names
-<literal>default</literal>, <literal>defaultClient</literal> and
-<literal>defaultServer</literal> which are used as defaults if the client or
-server block does not reference a block. Also note that a rewrite block must
-be defined before the client or server block that would use it. If you want
-the same rewrite rules for input from all clients and servers, you need just
-a single rewrite block named <literal>default</literal>, and the client and
-servers need not refer to it. If you want all clients to use one config, and
-all servers to use another, then you would be fine only defining two rewrite
-blocks named <literal>defaultClient</literal> and
-<literal>defaultServer</literal>. Note that these defaults are only used for
-rewrite on input. No rewriting is done on output unless explicitly specifed
-using the <literal>rewriteOut</literal> option.
-    </para>
-    <para>
-The available rewrite block options
-are <literal>addAttribute</literal>, <literal>addVendorAttribute</literal>,
-<literal>removeAttribute</literal>, <literal>removeVendorAttribute</literal>
-and <literal>modifyAttribute</literal>. They can all be specified none, one
-or multiple times.
-    </para>
-    <para>
-<literal>addAttribute</literal> is used to add attributes to a
-message. The option value must be on the
-form <literal>attribute:value</literal> where attribute is a numerical
-value specifying the attribute.  Simliarly,
-the <literal>addVendorAttribute</literal> is used to specify a vendor
-attribute to be added.  The option value must be on the
-form <literal>vendor:subattribute:value</literal>, where vendor and
-subattribute are numerical values.
-    </para>
-    <para>
-The <literal>removeAttribute</literal> option is used to specify an
-attribute that  should be removed from received messages. The option value
-must be a numerical value specifying which attribute is to be removed.
-Similarly, <literal>removeVendorAttribute</literal> is used to specify a
-vendor attribute that is to be removed. The value can be a numerical value
-for removing all attributes from a given vendor, or on the form
-<literal>vendor:subattribute</literal>, where vendor and subattribute are
-numerical values, for removing a specific subattribute for a specific
-vendor.
-    </para>
-    <para>
-<literal>modifyAttribute</literal> is used to specify modification of
-attributes. The value must be on the form
-<literal>attribute:/regexpmatch/replacement/</literal> where attribute is
-a numerical attribute type, regexpmatch is regexp matching rule and
-replacement specifies how to replace the matching regexp. Example usage:
-      <blockquote>
-        <para>
-modifyAttribute 1:/^(.*)@local$/\1@example.com/
-        </para>
-      </blockquote>
-    </para>
-  </refsect1>
-  <refsect1>
-    <title>See Also</title>
-    <para>
-      <citerefentry>
-        <refentrytitle>radsecproxy</refentrytitle>
-        <manvolnum>1</manvolnum>
-      </citerefentry>,
-      <ulink url="http://tools.ietf.org/html/draft-ietf-radext-radsec">
-        <citetitle>RadSec internet draft</citetitle>
-      </ulink>
-    </para>
-  </refsect1>
-</refentry>