+<sect3 renderas="sect4" id="trust-x-forwarded-for"><title>trust-x-forwarded-for</title>
+<variablelist>
+ <varlistentry>
+ <term>Specifies:</term>
+ <listitem>
+ <para>
+ Whether or not Privoxy should use IP addresses specified with the X-Forwarded-For header
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Type of value:</term>
+ <listitem>
+ <para>
+ <replaceable>0 or one</replaceable>
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Default value:</term>
+ <listitem>
+ <para>0</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Notes:</term>
+ <listitem>
+ <warning>
+ <para>
+ This is an experimental feature. The syntax is likely to change
+ in future versions.
+ </para>
+ </warning>
+ <para>
+ If clients reach Privoxy through another proxy, for example a load
+ balancer, Privoxy can't tell the client's IP address from the connection.
+ If multiple clients use the same proxy, they will share the same
+ client tag settings which is usually not desired.
+ </para>
+ <para>
+ This option lets Privoxy use the X-Forwarded-For header value as
+ client IP address. If the proxy sets the header, multiple clients
+ using the same proxy do not share the same client tag settings.
+ </para>
+ <para>
+ This option should only be enabled if Privoxy can only be reached
+ through a proxy and if the proxy can be trusted to set the header
+ correctly. It is recommended that ACL are used to make sure only
+ trusted systems can reach Privoxy.
+ </para>
+ <para>
+ If access to Privoxy isn't limited to trusted systems, this option
+ would allow malicious clients to change the client tags for other
+ clients or increase Privoxy's memory requirements by registering
+ lots of client tag settings for clients that don't exist.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Example:</term>
+ <listitem>
+ <screen>
+ # Allow systems that can reach Privoxy to provide the client
+ # IP address with a X-Forwarded-For header.
+ trust-x-forwarded-for 1
+</screen>
+ </listitem>
+ </varlistentry>
+</variablelist>
+</sect3>
+
+<!-- ~ End section ~ -->
+
+<!-- ~~~~~ New section ~~~~~ -->
+
+<sect3 renderas="sect4" id="receive-buffer-size"><title>receive-buffer-size</title>
+<variablelist>
+ <varlistentry>
+ <term>Specifies:</term>
+ <listitem>
+ <para>
+ The size of the buffer Privoxy uses to receive data from the server.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Type of value:</term>
+ <listitem>
+ <para>
+ <replaceable>Size in bytes</replaceable>
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Default value:</term>
+ <listitem>
+ <para>5000</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Notes:</term>
+ <listitem>
+ <para>
+ Increasing the receive-buffer-size increases Privoxy's memory usage but
+ can lower the number of context switches and thereby reduce the
+ cpu usage and potentially increase the throughput.
+ </para>
+ <para>
+ This is mostly relevant for fast network connections and
+ large downloads that don't require filtering.
+ </para>
+ <para>
+ Reducing the buffer size reduces the amount of memory Privoxy
+ needs to handle the request but increases the number of systemcalls
+ and may reduce the throughput.
+ </para>
+ <para>
+ A dtrace command like:
+ <quote>sudo dtrace -n 'syscall::read:return /execname == "privoxy"/ { @[execname] = llquantize(arg0, 10, 0, 5, 20); @m = max(arg0)}'</quote>
+ can be used to properly tune the receive-buffer-size.
+ On systems without dtrace, strace or truss may be used as
+ less convenient alternatives.
+ </para>
+ <para>
+ If the buffer is too large it will increase Privoxy's memory
+ footprint without any benefit. As the memory is (currently)
+ cleared before using it, a buffer that is too large can
+ actually reduce the throughput.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Example:</term>
+ <listitem>
+ <screen>
+ # Increase the receive buffer size
+ receive-buffer-size 32768
+</screen>
+ </listitem>
+ </varlistentry>
+</variablelist>
+</sect3>
+
+<!-- ~ End section ~ -->
+
+</sect2>
+
+
+<sect2 id="https-inspection-directives">
+<title>HTTPS Inspection (Experimental)</title>
+
+<para>
+ HTTPS inspection allows to filter encrypted requests.
+ This is only supported when <application>Privoxy</application>
+ has been built with FEATURE_HTTPS_INSPECTION.
+</para>
+
+<!-- ~~~~~ New section ~~~~~ -->
+
+<sect3 renderas="sect4" id="ca-directory"><title>ca-directory</title>
+<variablelist>
+ <varlistentry>
+ <term>Specifies:</term>
+ <listitem>
+ <para>
+ Directory with the CA key, the CA certificate and the trusted CAs file.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Type of value:</term>
+ <listitem>
+ <para>
+ Text
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Default value:</term>
+ <listitem>
+ <para><emphasis>Empty string</emphasis></para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Effect if unset:</term>
+ <listitem>
+ <para>
+ Default value is used.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Notes:</term>
+ <listitem>
+ <para>
+ This directive specifies the directory where the
+ CA key, the CA certificate and the trusted CAs file
+ are located.
+ </para>
+ <para>
+ The permissions should only let &my-app; and the &my-app;
+ admin access the directory.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Example:</term>
+ <listitem>
+ <para>
+ ca-directory /usr/local/etc/privoxy/CA
+ </para>
+ </listitem>
+ </varlistentry>
+</variablelist>
+<![%config-file;[<literallayout>@@#ca-directory /usr/local/etc/privoxy/CA</literallayout>]]>
+</sect3>
+
+<!-- ~ End section ~ -->
+
+<!-- ~~~~~ New section ~~~~~ -->
+
+<sect3 renderas="sect4" id="ca-cert-file"><title>ca-cert-file</title>
+<variablelist>
+ <varlistentry>
+ <term>Specifies:</term>
+ <listitem>
+ <para>
+ The CA certificate file in ".crt" format.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Type of value:</term>
+ <listitem>
+ <para>
+ Text
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Default value:</term>
+ <listitem>
+ <para><emphasis>cacert.crt</emphasis></para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Effect if unset:</term>
+ <listitem>
+ <para>
+ Default value is used.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Notes:</term>
+ <listitem>
+ <para>
+ This directive specifies the name of the CA certificate file
+ in ".crt" format.
+ </para>
+ <para>
+ The file is used by &my-app; to generate website certificates
+ when https inspection is enabled with the
+ <literal><ulink url="actions-file.html#HTTPS-INSPECTION">https-inspection</ulink></literal>
+ action.
+ </para>
+ <para>
+ &my-app; clients should import the certificate so that they
+ can validate the generated certificates.
+ </para>
+ <para>
+ The file can be generated with:
+ openssl req -new -x509 -extensions v3_ca -keyout cakey.pem -out cacert.crt -days 3650
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Example:</term>
+ <listitem>
+ <para>
+ ca-cert-file root.crt
+ </para>
+ </listitem>
+ </varlistentry>
+</variablelist>
+<![%config-file;[<literallayout>@@#ca-cert-file cacert.crt</literallayout>]]>
+</sect3>
+
+<!-- ~ End section ~ -->
+
+<!-- ~~~~~ New section ~~~~~ -->
+
+<sect3 renderas="sect4" id="ca-key-file"><title>ca-key-file</title>
+<variablelist>
+ <varlistentry>
+ <term>Specifies:</term>
+ <listitem>
+ <para>
+ The CA key file in ".pem" format.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Type of value:</term>
+ <listitem>
+ <para>
+ Text
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Default value:</term>
+ <listitem>
+ <para><emphasis>cacert.pem</emphasis></para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Effect if unset:</term>
+ <listitem>
+ <para>
+ Default value is used.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Notes:</term>
+ <listitem>
+ <para>
+ This directive specifies the name of the CA key file
+ in ".pem" format. See the <ulink url="#CA-CERT-FILE">ca-cert-file</ulink>
+ for a command to generate it.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Example:</term>
+ <listitem>
+ <para>
+ ca-key-file cakey.pem
+ </para>
+ </listitem>
+ </varlistentry>
+</variablelist>
+<![%config-file;[<literallayout>@@#ca-key-file cakey.pem</literallayout>]]>
+</sect3>
+
+<!-- ~ End section ~ -->
+
+<!-- ~~~~~ New section ~~~~~ -->
+
+<sect3 renderas="sect4" id="ca-password"><title>ca-password</title>
+<variablelist>
+ <varlistentry>
+ <term>Specifies:</term>
+ <listitem>
+ <para>
+ The password for the CA keyfile.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Type of value:</term>
+ <listitem>
+ <para>
+ Text
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Default value:</term>
+ <listitem>
+ <para><emphasis>Empty string</emphasis></para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Effect if unset:</term>
+ <listitem>
+ <para>
+ Default value is used.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Notes:</term>
+ <listitem>
+ <para>
+ This directive specifies the password for the CA keyfile
+ that is used when Privoxy generates certificates for intercepted
+ requests.
+ </para>
+ <para>
+ Note that the password is shown on the CGI page so don't
+ reuse an important one.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Example:</term>
+ <listitem>
+ <para>
+ ca-password blafasel
+ </para>
+ </listitem>
+ </varlistentry>
+</variablelist>
+<![%config-file;[<literallayout>@@#ca-password swordfish</literallayout>]]>
+</sect3>
+
+<!-- ~ End section ~ -->
+
+<!-- ~~~~~ New section ~~~~~ -->
+
+<sect3 renderas="sect4" id="certificate-directory"><title>certificate-directory</title>
+<variablelist>
+ <varlistentry>
+ <term>Specifies:</term>
+ <listitem>
+ <para>
+ Directory to save generated keys and certificates.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Type of value:</term>
+ <listitem>
+ <para>
+ Text
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Default value:</term>
+ <listitem>
+ <para><emphasis>./certs</emphasis></para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Effect if unset:</term>
+ <listitem>
+ <para>
+ Default value is used.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Notes:</term>
+ <listitem>
+ <para>
+ This directive specifies the directory where generated
+ TLS/SSL keys and certificates are saved when https inspection
+ is enabled with the
+ <literal><ulink url="actions-file.html#HTTPS-INSPECTION">https-inspection</ulink></literal>
+ action.
+ </para>
+ <para>
+ The keys and certificates currently have to be deleted manually
+ when changing the <ulink url="#CA-CERT-FILE">ca-cert-file</ulink>
+ and the <ulink url="#CA-CERT-KEY">ca-cert-key</ulink>.
+ </para>
+ <para>
+ The permissions should only let &my-app; and the &my-app;
+ admin access the directory.
+ </para>
+ <warning>
+ <para>
+ &my-app; currently does not garbage-collect obsolete keys
+ and certificates and does not keep track of how may keys
+ and certificates exist.
+ </para>
+ <para>
+ &my-app; admins should monitor the size of the directory
+ and/or make sure there is sufficient space available.
+ A cron job to limit the number of keys and certificates
+ to a certain number may be worth considering.
+ </para>
+ </warning>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Example:</term>
+ <listitem>
+ <para>
+ certificate-directory /usr/local/var/privoxy/certs
+ </para>
+ </listitem>
+ </varlistentry>
+</variablelist>
+<![%config-file;[<literallayout>@@#certificate-directory /usr/local/var/privoxy/certs</literallayout>]]>
+</sect3>
+
+<!-- ~ End section ~ -->
+
+<!-- ~~~~~ New section ~~~~~ -->
+
+<sect3 renderas="sect4" id="cipher-list"><title>cipher-list</title>
+<variablelist>
+ <varlistentry>
+ <term>Specifies:</term>
+ <listitem>
+ <para>
+ A list of ciphers to use in TLS handshakes
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Type of value:</term>
+ <listitem>
+ <para>
+ Text
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Default value:</term>
+ <listitem>
+ <para>None</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Effect if unset:</term>
+ <listitem>
+ <para>
+ A default value is inherited from the TLS library.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Notes:</term>
+ <listitem>
+ <para>
+ This directive allows to specify a non-default list of ciphers to use
+ in TLS handshakes with clients and servers.
+ </para>
+ <para>
+ Ciphers are separated by colons. Which ciphers are supported
+ depends on the TLS library. When using OpenSSL, unsupported ciphers
+ are skipped. When using MbedTLS they are rejected.
+ </para>
+ <warning>
+ <para>
+ Specifying an unusual cipher list makes fingerprinting easier.
+ Note that the default list provided by the TLS library may
+ be unusual when compared to the one used by modern browsers
+ as well.
+ </para>
+ </warning>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Examples:</term>
+ <listitem>
+ <screen>
+ # Explicitly set a couple of ciphers with names used by MbedTLS
+ cipher-list cipher-list TLS-ECDHE-RSA-WITH-CHACHA20-POLY1305-SHA256:\
+TLS-ECDHE-ECDSA-WITH-CHACHA20-POLY1305-SHA256:\
+TLS-DHE-RSA-WITH-CHACHA20-POLY1305-SHA256:\
+TLS-ECDHE-ECDSA-WITH-AES-128-GCM-SHA256:\
+TLS-ECDHE-ECDSA-WITH-AES-256-GCM-SHA384:\
+TLS-ECDHE-ECDSA-WITH-AES-256-CCM:\
+TLS-ECDHE-ECDSA-WITH-AES-256-CCM-8:\
+TLS-ECDHE-ECDSA-WITH-AES-128-CCM:\
+TLS-ECDHE-ECDSA-WITH-AES-128-CCM-8:\
+TLS-ECDHE-ECDSA-WITH-CAMELLIA-128-GCM-SHA256:\
+TLS-ECDHE-ECDSA-WITH-CAMELLIA-256-GCM-SHA384:\
+TLS-ECDHE-RSA-WITH-AES-128-GCM-SHA256:\
+TLS-ECDHE-RSA-WITH-AES-256-GCM-SHA384:\
+TLS-ECDHE-RSA-WITH-CAMELLIA-128-GCM-SHA256:\
+TLS-ECDHE-RSA-WITH-CAMELLIA-256-GCM-SHA384:\
+TLS-DHE-RSA-WITH-AES-256-GCM-SHA384:\
+TLS-DHE-RSA-WITH-AES-128-GCM-SHA256:\
+TLS-DHE-RSA-WITH-AES-256-CCM:\
+TLS-DHE-RSA-WITH-AES-256-CCM-8:\
+TLS-DHE-RSA-WITH-AES-128-CCM:\
+TLS-DHE-RSA-WITH-AES-128-CCM-8:\
+TLS-DHE-RSA-WITH-CAMELLIA-128-GCM-SHA256:\
+TLS-DHE-RSA-WITH-CAMELLIA-256-GCM-SHA384:\
+TLS-ECDH-RSA-WITH-AES-128-GCM-SHA256:\
+TLS-ECDH-RSA-WITH-AES-256-GCM-SHA384:\
+TLS-ECDH-RSA-WITH-CAMELLIA-128-GCM-SHA256:\
+TLS-ECDH-RSA-WITH-CAMELLIA-256-GCM-SHA384:\
+TLS-ECDH-ECDSA-WITH-AES-128-GCM-SHA256:\
+TLS-ECDH-ECDSA-WITH-AES-256-GCM-SHA384:\
+TLS-ECDH-ECDSA-WITH-CAMELLIA-128-GCM-SHA256:\
+TLS-ECDH-ECDSA-WITH-CAMELLIA-256-GCM-SHA384
+ </screen>
+ <screen>
+ # Explicitly set a couple of ciphers with names used by OpenSSL
+cipher-list ECDHE-RSA-AES256-GCM-SHA384:\
+ECDHE-ECDSA-AES256-GCM-SHA384:\
+DH-DSS-AES256-GCM-SHA384:\
+DHE-DSS-AES256-GCM-SHA384:\
+DH-RSA-AES256-GCM-SHA384:\
+DHE-RSA-AES256-GCM-SHA384:\
+ECDH-RSA-AES256-GCM-SHA384:\
+ECDH-ECDSA-AES256-GCM-SHA384:\
+ECDHE-RSA-AES128-GCM-SHA256:\
+ECDHE-ECDSA-AES128-GCM-SHA256:\
+DH-DSS-AES128-GCM-SHA256:\
+DHE-DSS-AES128-GCM-SHA256:\
+DH-RSA-AES128-GCM-SHA256:\
+DHE-RSA-AES128-GCM-SHA256:\
+ECDH-RSA-AES128-GCM-SHA256:\
+ECDH-ECDSA-AES128-GCM-SHA256:\
+ECDHE-RSA-AES256-GCM-SHA384:\
+AES128-SHA
+ </screen>
+ <screen>
+ # Use keywords instead of explicitly naming the ciphers (Does not work with MbedTLS)
+ cipher-list ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
+ </screen>
+ </listitem>
+ </varlistentry>
+</variablelist>
+</sect3>
+
+<!-- ~ End section ~ -->
+
+<!-- ~~~~~ New section ~~~~~ -->
+
+<sect3 renderas="sect4" id="trusted-cas-file"><title>trusted-cas-file</title>
+<variablelist>
+ <varlistentry>
+ <term>Specifies:</term>
+ <listitem>
+ <para>
+ The trusted CAs file in ".pem" format.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Type of value:</term>
+ <listitem>
+ <para>
+ File name relative to ca-directory
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Default value:</term>
+ <listitem>
+ <para><emphasis>trustedCAs.pem</emphasis></para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Effect if unset:</term>
+ <listitem>
+ <para>
+ Default value is used.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Notes:</term>
+ <listitem>
+ <para>
+ This directive specifies the trusted CAs file that is used when validating
+ certificates for intercepted TLS/SSL requests.
+ </para>
+ <para>
+ An example file can be downloaded from
+ <ulink url="https://curl.haxx.se/ca/cacert.pem">https://curl.haxx.se/ca/cacert.pem</ulink>.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Example:</term>
+ <listitem>
+ <para>
+ trusted-cas-file trusted_cas_file.pem
+ </para>
+ </listitem>
+ </varlistentry>
+</variablelist>
+<![%config-file;[<literallayout>@@#trusted-cas-file trustedCAs.pem</literallayout>]]>
+</sect3>
+
+<!-- ~ End section ~ -->
+
+</sect2>
+
+<!-- ~~~~~ New section ~~~~~ -->
+
+<sect2 id="windows-gui">
+<title>Windows GUI Options</title>
+<para>
+ <application>Privoxy</application> has a number of options specific to the
+ Windows GUI interface:
+</para>
+
+<anchor id="activity-animation">
+<![%config-file;[<para>@@</para>]]> <!-- for spacing -->
+<para>
+ If <quote>activity-animation</quote> is set to 1, the
+ <application>Privoxy</application> icon will animate when
+ <quote>Privoxy</quote> is active. To turn off, set to 0.
+</para>
+
+<![%config-file;[<literallayout>@@#activity-animation 1</literallayout>]]>
+<![%user-man;[
+ <literallayout>
+ <emphasis>activity-animation 1</emphasis>
+</literallayout>
+]]>
+
+<anchor id="log-messages">
+<![%config-file;[<para>@@</para>]]> <!-- for spacing -->